Automotive tire

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

 

The present invention relates to a tyre for a vehicle, in particular for a winter tire for cars with an average displacement of the engine, for example, 1000-2000 cm3.

Under the winter tyre means a tyre provided with a tread that is suitable for movement on surfaces characterized by the reduced density, particularly on the road roads covered with snow.

Usually tires of this type, in addition to the excellent performance characteristics when driving on snow, must have operational characteristics when driving on wet and dry surfaces, similar to that of summer tires or only slightly lower compared to summer tyres.

In addition, the tires of this class must have along with excellent traction characteristics of the tire with the road when the application of tractive effort, braking and handling on snow-covered roadways also good adhesion characteristics of the tyre with the road when the application of tractive effort and braking and handling characteristics when driving on dry and wet surfaces and satisfactory wear resistance.

The above-mentioned characteristics can be achieved through education in the tread bracelet respective transverse and circumferential grooves having the appropriate size and orientation.

The intersection of the grooves causes the education blocks, which given the shape in accordance with the various shapes that have the appropriate design and are located in circumferential rows arranged next to each other.

Circumferential grooves may affect directivity and stability of the bus when it is moving with respect to lateral efforts (efforts shift/drift), which are directed parallel to the axis of rotation of the tire.

Transverse grooves, in turn, can affect the adhesion characteristics of the tire with the road, that is, the ability of the transmission to the road surface tangential effort parallel to the direction of movement during acceleration and braking of the vehicle.

Circumferential and transverse grooves can also affect drainage in the area of contact with the road surface (imprint area) while driving on a wet road surface.

In addition, winter tyres are distinguished by the presence of densely Packed narrow drainage grooves. Slit drainage grooves are small grooves or incisions, especially narrow compared to the rest of grooves, which provide the ability to capture and hold snow, resulting in more traction with the road in the snow, because the friction of the snow on the snow more friction rubber on snow.

In the publication OR described tire, designed for use in C is mnich conditions, with protective bracelet, which is divided by transverse and circumferential grooves on the core elements, such as blocks or rows of blocks or ribs, passing in the circumferential direction. Some core elements, preferably all of them have the grid of V-shaped grooves, which are located within the profile elements in accordance with the cell configuration. One edge is located in the Central area, in particular, so that it runs along the Equatorial plane. Such a rib is formed from several parts of the blocks with a rectangular shape or a shape of a parallelogram.

In the publication OR described tire for vehicles, in particular intended for use in winter driving conditions, containing the blocks that are located in the Central row of blocks and connected to another adjacent blocks adjacent to the ring groove. At the same time, each block is divided by essentially circumferential groove into two parts, which are essentially the same size and are connected to each other.

As noted, a large number of transverse grooves with the increased width provides improved adhesion of the tire with the road, especially on wet surfaces and ensures good flexibility of the unit, however, their widespread use may lead to poor performance ha is acteristic when driving on dry surfaces and increased noise from rolling tires. Indeed, one of the main causes of noise is a continuous sequence of blows edges of the blocks on the road surface.

To ensure the possibility of maintaining a high level of safety under all conditions of use, in particular in the case of winter tyres, the tyre must also have excellent characteristics under braking (both on dry and wet surfaces and snow), and possess resistance to aquaplaning, while these two properties are in conflict with each other, as required to brake low coefficient of voidness, and to ensure good water drainage is also required a corresponding number of grooves and the first width (and, therefore, a large coefficient of voidness).

In addition, attention was drawn to an increased ratio of voidness in the Central part of winter tyres in the prior art compared to summer tyres. This choice is essentially due to the need to improve water drainage on wet surfaces and provide good flexibility of this part. However, an increased ratio of voidness can lead to deterioration of operating characteristics when driving on dry surfaces, as well as increased noise from rolling tyres and tyre wear.

It was found that wisewoman the process problems associated with mutually opposite requirements can be addressed through the design of the tread having in the Central part near the Equatorial plane low coefficient of voidness and contains circumferential grooves with a wavy profile, and the undulating profile of the grooves coincide in phase with each other.

More precisely, in accordance with one aspect of the present invention relates to a tyre for a vehicle having a tread containing the Central part (L1), covering two sides of the Equatorial plane, and two shoulder pieces, with the Central part (L1) is separated from the shoulder portions of the tread first two circumferential grooves, with at least two second circumferential grooves are in the Central part (L1), characterized in that

the second circumferential grooves define the boundaries of the Central district ribs, containing many narrow drainage grooves that are parallel to each other;

the Central rib (10) has a coefficient of voidness, which is less than 0,1;

the second circumferential grooves extend with undulating profile, mainly coinciding in phase with each other, along the length of the tire in the circumferential direction.

For the purposes of this invention the length of the district and/or transverse grooves and their profile can be defined, taking the base of the middle line edges, outside in the radial direction.

In addition, for the present invention, the expression "mainly coincident in phase with each other relating to the district grooves having a wavy profile, means that the distance in axial direction between the two grooves is largely constant along the length of the tire in the circumferential direction.

Low coefficient of voidness together with the reduced size of the slit drainage grooves provides sacrificial giving the bracelet in the Central part of the large structural density to ensure excellent handling characteristics both on snow covered surfaces, and wet and/or dry surfaces.

In the present description and in the subsequent claims under the "coefficient of emptiness" refers to the value of the ratio, determined on a square footprint between the sections of the tread, which has slits and/or grooves (emptiness), and which therefore do not have physical contact with the ground, and the size of the print.

At the same time, the second undulating circumferential grooves make the Central part of the less rigid in the longitudinal direction. This improves lateral stability and to improve operational performance Shi is s when driving around bends in the conditions of the snow-covered roads due to both reduce the impact of turning control while entering the turn, and by reducing the loss of grip of the rear tyres with the road at the exit of the turn, when the user again begins to accelerate motion.

In accordance with the above aspect of the present invention may have at least one of the preferred characteristics described below.

To reduce the availability of high stress concentration second circumferential grooves may extend along the length of the tire in the circumferential direction in the form of a sine wave.

Preferably, if there is a functional dependence between the length λ of the wave sine wave and step tread pattern tires.

The second circumferential grooves preferably can have a width, which is less than 12 mm

The second circumferential grooves preferably may have a depth that constitutes more than 5 mm

First and second circumferential grooves are preferably determined in the Central part (L1) of the boundaries of two series Central units, where each number is located laterally with respect to the Central rib.

The Central rib may preferably have a coefficient of voidness, which is less than 0,07, preferably less than 0.06.

Each series Central units preferably contains multiple Central units and many essentially transverse grooves. Transverse grooves are made with the possibility of limiting the Oia Central blocks in the circumferential direction.

Essentially transverse grooves preferably can be at least 50% of the width of a number of Central units.

In the present description and in the subsequent claims under the length of the transverse grooves is the length of the projection of the above-mentioned grooves in a straight line, perpendicular to the Equatorial plane and crossing the County line.

To create a part that is suitable for capturing snow and ensure good water drainage, is essentially transverse grooves may have a variable width along their length with a cross section decreasing towards the Central ridge.

Transverse grooves preferably can have a width constituting less than 10 mm

Each Central unit from a number of Central units is limited in axial direction by the site of one of the first circumferential grooves and the site of one of the second circumferential grooves and is limited in the circumferential direction by two essentially transverse grooves.

In accordance with a particularly preferred aspect of the Central blocks can have rounded edges to create the front parts that can capture the snow.

Blending the edges of the Central units, in addition to strengthening the grip of snow and, thus, provide a better grip of the tyres with the road when the application of tractive effort and SEL the Institute, provides stiffening block on its edge to eliminate or at least reduce uneven wear, which can adversely affect the data part of the bus.

Each shoulder portion preferably contains at least one row of side blocks containing multiple blocks of the shoulder area.

Each block of the shoulder area is preferably limited in the circumferential direction by two essentially transverse grooves and limited in axial direction by the site of one of the first circumferential grooves.

Essentially transverse grooves are preferably at least 50% of the width of the row of blocks of the shoulder area.

The blocks of the shoulder area preferably have rounded edges to create the front parts that can capture the snow.

Exciting front part of the Central blocks together with breathtaking front parts of the blocks of the shoulder zones preferably create a zone of intersection between the first circumferential grooves and essentially transverse grooves the plots of the first transverse grooves having a wider cross-section for capture of snow.

To provide excellent grip on snow covered ground, each row of blocks can have multiple slit drainage grooves.

Slit drainage grooves can have vollnoob the EIT profile. Slit drainage grooves preferably have a sinusoidal profile.

Slit drainage grooves have a depth of from 2 to 10 mm, for example equal to 8 mm, and the width, constituting less than 2 mm.

A similar profile and dimensions of slit drainage grooves simultaneously provide excellent cohesive properties of the tires with the road when the application of tractive effort and braking under all driving conditions tires on the straights and/or cornering.

Slit drainage grooves are preferably essentially parallel to each other. Slit drainage grooves are preferably spaced from each other, which depends on the step tread pattern tires.

Slit drainage grooves of the Central ribs are preferably in a direction essentially perpendicular to the Equatorial plane.

Slit drainage grooves of the Central blocks and blocks of the shoulder zones preferably are in the Central blocks and blocks shoulders with the task direction opposite to the inclination essentially transverse grooves that define the boundaries of the blocks that contain them.

In addition, it is envisaged that in the present description and in the subsequent claims every angle, suitable for display of inclination of the grooves or exciting front, defined as the angle about sovanny between the plane parallel to the Equatorial plane passing through the nearest in the axial direction of the ring groove, and the plane, which belongs to the said groove or addictive front part.

The tire according to the invention has a good grip, excellent adhesion characteristics of the tire with the road when braking and traction when driving on wet or snow covered surfaces of roads, very low noise levels, provides a high level of comfort and exhibits excellent behavior when driving on dry road surfaces.

The characteristics and advantages of the invention will be presented hereinafter with reference to embodiments of shown as non-limiting examples in the accompanying drawings, in which

figure 1 is a perspective view of a tire having a tread made in accordance with one example of the invention;

figure 2 is a view in plan of the tire tread with figure 1;

figa is an enlarged cross section of the protector with 2;

fig.2b - view in terms of an enlarged portion of the tread of the tire of figure 2;

figure 3 is a view in plan of a variant of the tread with figure 2;

figa is an enlarged cross section of the tread with figure 3; and

figure 4 - noise spectra from rolling tires in accordance with the invention and a control bus, measured inside the car.

In figure 1, 2, 2b shows a tire 1 with the first option Khujand is the implementation of the protector 2 in accordance with the invention.

The design of the tyre 1 is itself a construction of the conventional type and includes a carcass, a tread bracelet placed on top of the frame, two sides that are opposite in the axial direction and terminating sides, which strengthened the side rings and the respective side reinforcing ribbons. The bus is also preferably contains brickery constructive element located between the carcass and tread bracelet. The frame contains one or more layers of the frame attached to the side rings, while brickery constructive element contains two bracerie tapes that are located in the radial direction on top of one another. Bracerie tape segments formed of a rubber-textile material comprising metal cords that are parallel to each other within each tape and have the orientation of the crossed towards Kardam adjacent strips, preferably with symmetric tilt relative to the Equatorial plane. Brickery structural element preferably also contains a third Bracero the ribbon, located in the radial direction farthest from the center and provided with a cord, oriented essentially parallel to the Equatorial plane.

Bus 1 preferably has the relationship is N/a With height in the perpendicular cross section to the maximum width of the cross-section, average of from 0.35 to 0.80.

To ensure great mileage and high performance characteristics during the entire life of a tyre, in particular those associated with the handling, tread 2 has an overall coefficient of voidness, which is small when considering it for winter tyres, is less than 0.35, preferably less than 0,34, for example it is equal to about 0,32.

The protector 2 is made with circumferential grooves 3, 4, 5 and 6 (figure 1-2b), passing in the longitudinal direction.

The protector 2 includes the Central part L1 and two shoulder parts L2, L3.

The protector 2 is a drawing of a directional type, in other words, the tread pattern of the bracelet is essentially a mirror-like relative to the Equatorial plane, and essentially transverse grooves, which are located from the Central part of the L1 in the direction of the shoulder parts and determine the direction of rolling tires 1 indicated by the arrow F in figure 2.

By "essentially mirror-like" in the definition given directly above, refers to specular reflection in a broad sense, which may include small differences in some details and/or arrangement of the parts tires with offset and/or the part on the right side of the Equatorial plane relative to the part on the left side.

B is more detail, the Central part L1 has two circumferential rows 9 and 11 blocks and a Central rib 10, limited in the axial direction, two second circumferential grooves 4, 5. The presence of circumferential grooves 4, 5 in General, makes the Central part L1 sacrificial bracelet 2 less rigid in the longitudinal direction while maintaining a large amount of rubber in the soil in the Central part near the Equatorial plane 7 bus 1. The Central rib 10 has a coefficient of voidness, constituting less than 0.1.

The shoulder section L2 is separated from the number 9 circumferential groove 3.

The number 9 is located between the circumferential grooves 3 and 4. The number 10 is located between the circumferential grooves 4 and 5. The number 11 is located between the circumferential grooves 5 and 6. The shoulder section L3 is separated from a number of 11 blocks in the first circumferential groove 6.

The first circumferential grooves 3 and 6 preferably have a width in the range from approximately 5 mm to approximately 16 mm, more preferably from 7 to 11 mm, the First circumferential grooves 3 and 6 preferably have a depth in the range from about 5 mm to 11 mm

The second circumferential grooves 4 and 5 have a width which is less than the width of the first circumferential grooves. The second circumferential grooves 4, 5 preferably have a width of from 1.2 to 12 mm

The second circumferential grooves 4 and 5 can have a constant width throughout their depth.

The second grooves 4 and 5 pre is respectfully can have variable width and their depths. As an example, in the embodiment shown in figure 2 and 2A, the second grooves 4 and 5 are along their length in the radial direction, two sections with different widths: the first section in the tread part of the bracelet, the most distant from the center in the radial direction, which has a large width in the range from 6 to 12 mm, for example equal to approximately 8 mm, and the second section closest to the center in the radial direction and has a width of from 1.2 mm to 5 mm, for example equal to approximately 2 mm

The second circumferential grooves 4, 5 may have a depth, constituting less than 10 mm, preferably constitutes more than 5 mm, for example equal to 8 mm

Alternatively, the first and second circumferential grooves 3, 6, 4, 5 can have the same width and/or depth without departing from the scope of protection of the present invention.

The side walls of the first circumferential grooves 3, 6 can have an asymmetric tilt relative to the straight line perpendicular to the tread surface of the bracelet, in accordance with the actual grooves.

For example, as can be seen in figa, the side wall 308 of the circumferential groove 3 has a slope angle of approximately 10°, while the opposite wall 309 has an angle of inclination of approximately 5°relative to the perpendicular to the groove 3.

Similarly, b is the lateral wall 612 circumferential groove 6 has an angle of inclination, of approximately 10°, while the opposite wall 608 has an angle of inclination of approximately 5°relative to the perpendicular to the groove 6.

The side walls 408, 412 second circumferential grooves 4 may be symmetrically mirrored such inclinations relative to the Central line of the groove. In more detail, the side wall 408, and the side wall 412 circumferential grooves 4 have a tilt angle of approximately 5°relative to the Central line.

In addition, the side walls 508, 512 second circumferential grooves 5, like the side walls 408, 412 second circumferential grooves 4 may be symmetrically mirrored such inclinations relative to the Central line of the groove.

In more detail, the side wall 508, and the side wall 512 circumferential grooves 5 have a tilt angle of approximately 5°relative to the Central line.

In the end, a circumferential groove 6 may have a depth, constituting less than 10 mm, preferably more than 5 mm, for example equal to 8 mm

The side walls of the grooves 3, 4, 5, 6 can have angles of inclination with respect to their center lines, different from those mentioned above, without departing from the scope of protection of the present invention.

To improve the lateral stability of the tire and, therefore, to improve the operational characteristics of the tires when is the movement on turns in the conditions of the snow-covered roads second circumferential grooves 4, 5 have a wavy profile.

Circumferential grooves 4, 5 preferably have an average line in the form of a curvilinear profile/contour along the length of the tire in the circumferential direction. For example, in the embodiment shown in figures 1, 2, 2A, 2b, the second circumferential grooves 4, 5 have an average line in the form of a sinusoidal profile along the length of the tire in the circumferential direction.

Alternating concavity sinusoidal profile with respect to a plane parallel to the Equatorial plane 7, provides an excellent balance of adhesion characteristics of the tyre with the road when the application of tractive effort and braking especially when driving in corners and at the same time provides a reduction in the availability of high stress concentration.

To increase the amount of rubber in the soil in the Central rib 10 second circumferential grooves 4, 5 are basically the same in phase with each other along the length of the tire in the circumferential direction. This characteristic provides a large number of rubber at the ground" in the Central rib 10, therefore, low coefficient of voidness and, as a consequence, excellent handling characteristics and low noise.

The middle line of the second circumferential grooves 4, 5 are along the length of the tire in the circumferential direction in the form of a sine wave is ROFILE, the length λ of the wave and the amplitude α of the wave.

The ratio of amplitude to wavelength α/λ is preferably more than 0.07.

Even more preferably, if the ratio is less than 0.15.

These dimensions are more conducive to the formation of essentially circumferential groove with an almost complete absence of high stress concentration.

In the embodiment shown in figure 2-2b, there is a significant correlation between the length λ of the wave and step tread pattern of the tyre, which in this case is equal to unity. In other words, along the length in the circumferential direction length λ of the wave is essentially equal to each step tread pattern of the tire 1 (hence, the change in wavelength corresponds to a change of step).

As was previously planned, the first circumferential grooves 3, 6 separates the Central part L1 of the tread from the shoulder parts L2, L3, while the second circumferential grooves 4, 5 is determined in the Central part L1 tread the boundaries of two Central circumferential rows 9, 11 blocks and the center rib 10. The Central rib 10 preferably covers two sides of the Equatorial plane 7.

At least one of the Central rows 9, 11 blocks contains essentially transverse grooves 15, 16, passing at least 50% of the width samog the series.

In the embodiment shown in figure 2-2b, essentially transverse grooves 15, 16 are preferably on the entire width of the Central rows 9, 11 blocks, defining the boundaries of the Central blocks 13, 14.

In more detail, the number 9 is the sequence of blocks 13, and the number 11 contains a sequence of blocks 14.

In the example of figure 2 the protector 2 has a coefficient of voidness of approximately 0.18 in row 8 blocks of shoulder area; the ratio of voidness of approximately 0.13 in district number 9 units; the ratio of voidness approximately 0,08 district number 10 blocks; ratio of voidness of approximately 0.13 in district number 11 blocks, and the coefficient of voidness of approximately 0.18 in row 12 of the blocks of the shoulder area.

Matching the coefficients of voidness in rows 8, 12 shoulder areas help to improve vehicle performance when driving on a wet road surface, especially when the tires are mounted on the vehicle, with the average displacement engine.

Each block 13 from the district number 9 is limited in axial direction by section 103 of the first circumferential grooves 3 and section 104 of the second circumferential groove 4 and is limited in the circumferential direction of the two following each other in the circumferential direction of the transverse grooves 16.

As mentioned earlier, before Occitania embodiment, shown in figure 1-2b, each transverse groove 16 extends from the farthest from the center in the axial direction of the circumferential grooves 3 to the adjacent circumferential grooves 4. Each transverse groove 16 has a middle line having a slope relative to the Equatorial plane 7 for formation of an angle β which is less than 80°, preferably more than 30°, for example equal to approximately 65°.

Each transverse groove 16 may have a width of from 3 to 10 mm, preferably from 3.5 to 7 mm, for example equal to 4 mm

The transverse grooves 16 have a variable width along their length. To facilitate capture of snow groove 16 is formed by two essentially straight sections, of which the most distant from the center in the axial direction of the section 16A has a large width and the closest to the center in the axial direction of the section 16b has a width decreasing toward the Equatorial plane 7.

The transverse groove 16 may have a depth, which is less than 12 mm, preferably less than 10 mm, for example equal to 8 mm

To provide greater strength in the Central part L1 of the cross groove 16 does not have a constant depth throughout their length, instead they have a constant depth on a particular farthest from the center in the axial direction of the plot and the depth gradually decreasing as priblizeni the second circumferential groove 4.

Each block 14 from the district number 11 is limited in axial direction by section 106 of the first circumferential grooves 6 and section 105 of the second circumferential groove 5 and is limited in the circumferential direction of the two following each other in the circumferential direction of the transverse grooves 15.

Blocks 14 from number 11 have the same shape as the blocks 13 of the series 9, but are slightly offset in the circumferential direction relative to them.

As mentioned previously, in the preferred embodiment shown in figure 1-2b, each transverse groove 15 extends from the farthest from the center in the axial direction of the first circumferential groove 6 to the adjacent circumferential grooves 5. Each transverse groove 15 has a center line having a slope relative to the Equatorial plane 7 for formation of an angle β which is less than 80°, preferably more than 30°, for example equal to approximately 65°.

Each transverse groove 15 may have a width of from 3 to 10 mm, preferably from 3.5 to 7 mm, for example equal to 4 mm

The transverse grooves 15 and grooves 16 have a variable width along their length. Indeed, to facilitate capture of snow groove 15 is formed by two essentially straight sections 15A, 15b, of which the most distant from the center in the axial direction section 15A has a large width and the Liski to the center in the axial direction section 15b has a width, decreasing toward the Equatorial plane 7.

The transverse grooves 15 have a depth, which is less than 12 mm, preferably less than 10 mm, for example equal to 8 mm

To provide greater strength in the Central part of L1 transverse groove 15 does not have a constant depth throughout their length, instead they have a constant depth on a particular farthest from the center in the axial direction of the plot and the depth gradually decreasing as it approaches the second circumferential groove 5.

To improve the properties of adhesion of the tires with the road when the application of tractive effort and braking when driving on snow especially when the car makes a slight turn, the Central blocks 13 and 14 do not have sharp edges, but rather have rounded edges, with the result that the front side that can capture snow (see fig.2b).

In more detail, the outside in the axial direction of each of the Central unit 13, respectively 14, smoothly mates with the bottom wall of the groove 16, 15 respectively, for the formation of exciting top front side 43, 44 respectively. Edge of the top exciting front sides 43, 44 are defined by surfaces forming acute angles with each other.

Outside in the axial direction of each of the Central block 13, with the NGOs 14, smoothly mates with the upper wall of the groove 16, 15 respectively, for the formation of the bottom exciting front side 45, 46 respectively. The bottom exciting front sides 45, 46 are defined by planes, forming obtuse angles with each other.

Blending the edges of the Central blocks 13, 14, in addition to improve entrainment of snow and, thus, provide greater traction tires with the road when the application of tractive effort and braking, gives rigidity to the block 13 on its edge to eliminate or in any case reduce the effects of uneven wear.

To ensure a very good grip of the tires with the soil in snow-covered soils blocks 13, 14, and the rib 10 contain many narrow drainage grooves 20, 21.

Slit drainage grooves 20, 21 have a wavy profile, preferably sinusoidal.

Slit drainage grooves 20, 21 may have a depth, comprising from 2 to 10 mm, for example equal to 8 mm, and the width, constituting less than 2 mm.

Slit drainage grooves 20 are preferably in the Central rib 10 with the job the average direction of their length, essentially perpendicular to the Equatorial plane 7 bus 1.

Slit drainage grooves 21 are preferably in the Central blocks 13, 14 with the job the average direction of their PR is tsennosti, essentially the opposite slope of the middle line of the transverse grooves 15, 16.

The mean direction of the length of slit drainage grooves 21 and the tilt direction of the transverse grooves 15, 16, bounding the Central blocks 13, 14, preferably form an angle of less than 90°, preferably an angle less than 75°, for example an angle of approximately 40°.

As was previously planned, two shoulder parts L2, L3 are separated in the axial direction from the Central part L1 of the tread 2, respectively, the first grooves 3 and 6.

Each shoulder portion L2 and L3 has a transverse groove 56, 66 respectively.

Transverse grooves 56, 66 respectively, are repeated in the circumferential direction.

Transverse grooves 56, 66 respectively, have an average line that has a slope relative to the Equatorial plane 7.

In particular, the middle line of the grooves 56 forming with the Equatorial plane 7 angle ω, which is less than 90°.

In the embodiment shown in figure 2-2b, the angle ω is more than 45° and preferably equal to 80°.

Each groove 56, 66 respectively, passes from the groove 3, 6 respectively, closest to the center in the axial direction, to the area near the respective farthest from the center in the axial direction of the edges of the tread bracelet 2./p>

Beside farthest from the center in the axial direction by the edge of the tread bracelet 2 each groove 56, 66 respectively, by means of essentially longitudinal section 156, 166 are connected to the next in the circumferential direction of the transverse groove 56, 66 respectively.

Grooves 56, 66 do not have a constant depth, but rather have a variable depth. To increase structural strength of the blocks of the shoulder zones of the longitudinal grooves 56, 66 have a variable depth, which decreases at the respective ends, which causes the formation of ledges.

In particular, each longitudinal groove 56, 66 in the Central portion has a generally constant depth greater than 3 mm and constituting less than 10 mm, preferably equal to 8 mm

In the end parts of the longitudinal grooves 56, 66 have a depth, comprising from 1 mm to 5 mm, preferably equal to 2 mm.

However, longitudinal grooves 56, 66 can have a different depth without departing from the scope of protection of the present invention.

Through their path, and together with the first circumferential groove 3 groove 56 define the boundaries of a number of 8 blocks of the shoulder portion L2. The number 8 blocks has many blocks 23 of the shoulder area.

Thus, each block 23 of the shoulder area is limited in the circumferential direction by two essentially transverse grooves 56, the following other the other in the circumferential direction, and limited in axial direction by a part of the first circumferential grooves 3 and essentially longitudinal section 156.

Similarly, the grooves 66 in conjunction with the first circumferential groove 6 define the boundaries of a number of 12 blocks of the shoulder part. A number of 12 units has many blocks 24 of the shoulder area.

Thus, each block 24 of the shoulder area is limited in the circumferential direction by two essentially transverse grooves 66, following each other in the circumferential direction, and is limited in axial direction by a part of the first circumferential grooves 6 and essentially longitudinal section 166.

To improve the properties of adhesion of the tires with the road when the application of tractive effort and braking when driving on snow blocks 23 and 24 and in this case do not have sharp edges, but rather have rounded edges, with the result that the front side that can capture the snow.

In more detail, the inner axial direction of each block 23 is smoothly mates with the bottom wall of the groove 56 for the formation of the bottom exciting front side 47. Edge of the top exciting front side 47 are defined by planes forming an obtuse angle with each other.

Internal in the axial direction of each block 23 is smoothly mates with the upper wall of the groove 56 for the formation of the lower grip is that the front side 48. The lower edge of an exciting front side 48 are defined by planes forming an acute angle with each other.

Blending the edges of the block 23, in addition to improve entrainment of snow and, thus, provide greater traction tires with the road when the application of tractive effort and braking, gives rigidity to the block 23 on its edge to eliminate or in any case reduce the occurrence of the phenomena of uneven wear.

Each intersection formed by the first groove 3 and the transverse grooves 56 and 16, the lower gripping the front side 48 of the block 23 has a slope of essentially parallel to the upper slope and exciting front side 43 of the block 13, while the upper addictive front side 47 of the block 23 has a slope of essentially parallel to the slope of the bottom exciting front side 45 of the block 13.

Thus, each intersection has an expanding portion of the first groove 3, which forms a zone of capture of the snow, which provides increased friction of the snow on the snow and, thus, the friction of the tires on the ground and provides a significant increase friction of the tires with the road when the application of tractive effort and braking on snow-covered surfaces.

The same takes place for the blocks 24.

In more detail, the inner axial direction of the portion of the AC is Dogo block 24 smoothly mates with the bottom wall of the groove 66 for education exciting top front side 49. Edge of the top exciting front side 49 are defined by planes forming an obtuse angle with each other.

Internal in the axial direction of each block 24 is smoothly mates with the upper wall of the groove 66 for the formation of the bottom exciting front side 50. The lower edge of an exciting front side 50 are defined by planes forming an acute angle with each other.

Blending the edges of the block 24, in addition to improve entrainment of snow and, thus, provide greater traction tires with the road when the application of tractive effort and braking, gives rigidity to the block 24 on its edge to eliminate or in any case reduce the occurrence of the phenomena of uneven wear.

Each intersection formed by the first groove 6 and the transverse grooves 66 and 15, the plane defined by the bottom exciting front side 50 of the block 24 of the shoulder area, has a slope of essentially parallel to the tilt plane defined by the top exciting front side 44 of the Central unit 14, while the plane defined by the top exciting front side 49 of the block 24 has a slope that is essentially parallel to the tilt plane defined by the bottom exciting front side 46 of the Central unit 14. Thus, each intersection has a p is stereomate part of the first grooves 6, which forms the zone of capture of the snow.

To further enhance the adhesion of the tyre and the ground is snow-covered soils blocks 23, 24 of the shoulder zones, similar to the Central blocks 13, 14, "covered" slit drainage grooves 22.

Slit drainage grooves 22 have a wavy profile, preferably sinusoidal. Slit drainage groove 22 may have a depth, comprising from 2 to 10 mm, for example equal to 8 mm, and the width, constituting less than 2 mm.

To ensure the best balance between traction characteristics of the tire with the road when the application of tractive effort and braking slit drainage grooves 22 are held in the blocks 23, 24 respectively, with a slope opposite to the slope of the grooves 56, 66 respectively.

The main direction of the length of slit drainage grooves 22 and the tilt direction of the transverse grooves 56, 66, limiting the Central blocks 23, 24, form an angle of less than 90°, preferably an angle less than 75°, for example an angle of approximately 45°.

Wave-like slit drainage grooves 22 and the slope opposite to the slope of the grooves 56, 66, ensure the block 23, 24 respectively, higher strength.

Indeed, provided the anti-deformation unit during the movement for p the collar.

Figure 3 shows the protector, which is a variant of the protector of figure 2 and in which corresponding elements are denoted by the same reference position. Protector 202 is identical to the protector 2 except for the length of the transverse grooves 16, 15 Central part L1 and kind of wavy profile of the second grooves 4, 5.

Indeed, in this case, the transverse grooves 15 and 16 are not on the whole width of the number 9 and 11 blocks, but only on her part.

Each transverse groove 14, 15 respectively, extends from the first circumferential groove 3, 6 respectively, toward the adjacent second circumferential groove 4, 5 respectively, with length equal to at least 50% of the width of the specified number 9; 11 blocks, preferably with a length equal to at least 70%.

The second circumferential grooves 4, 5 in this case also have a wavy profile.

Circumferential grooves 4, 5 preferably have an average line along the length of the tire 1 in the circumferential direction in the form of a curvilinear profile. In addition, in the embodiment according to figure 3 the second circumferential grooves 4, 5 have an average line along the length of the tire in the circumferential direction in the form of a sinusoidal profile.

To increase the amount of rubber in the soil in the Central rib 10 second district Kanak is 4, 5 largely coincide in phase with each other along the length of the tire in the circumferential direction. This characteristic provides a large number of rubber at the ground" in the Central rib 10, therefore, low coefficient of voidness and, as a consequence, excellent handling characteristics and low noise.

Compared with the sinusoidal pattern tread bracelet, shown in figure 2-2A, sine wave, defined medium lines of the second grooves 4, 5 are of smaller amplitude and longer length λ of the wave. The middle line of the second circumferential grooves 4, 5 are really along the length of the tire in the circumferential direction in the form of a sinusoidal profile, the length λ of the wave and the amplitude α of the wave. The ratio α/λ of the amplitude to the wavelength is preferably more than 0.03 in.

The ratio α/λ of the amplitude to the wavelength is preferably less than 0,015.

In addition, the ratio of the wavelength of the sinusoid to step tread pattern of the tire is modified, in this case, the wavelength and the step are in the ratio of approximately 1:2. In other words, one length λ of the wave meets every two steps.

Extended length λ of the wave provides giving the tire more traction with the road when driving around bends, because it provides increased bearing surface, ensure cinemoi second grooves.

In the embodiment shown in figure 3, 3A, the second circumferential grooves 4, 5 have a width that exceeds the width of the second circumferential grooves 4, 5 in the embodiment shown in figure 2, 2A, 2b. Indeed, in this case, the second circumferential grooves 4, 5 may have a width in the range from 8 mm to 12 mm

On the contrary, in the embodiment of figure 2, 2A, 2b second circumferential grooves 4, 5 preferably have a width in the range from 1.2 mm to 5 mm

An implementation option, shown in figure 2, 2A, 2b, especially suitable for tires having a reduced width (chord) in cross-section, for example, tires with nominal width in cross-section, component to 195. In contrast, an implementation option, shown in figure 3, 3A, especially suitable for tyres with a larger width in the cross section.

Sample tire according to the invention, having a protector of figure 1-2, was produced and subjected to tests to compare with the bus, manufactured by the applicant and which has excellent characteristics for use it on snow covered, wet and dry surfaces, and allowed to be used for vehicles with an average displacement engine.

Both tires have a size of 195/65 R15 with rim 7JX16 and the internal pressure in the tire at 2.2 bar.

Volkswagen Golf 5 was initially equipped with four tires according to the invention, then look no further than the two comparable tires.

Tests were carried out on the aquaplaning on a straight stretch of road and on the turn, on dry and wet road surface, testing the grip of the tyres with the road when the application of tractive effort and braking tests to determine characteristics when driving on snow-covered road surface, testing the noise inside and outside the car and tested to determine comfort.

Test aquaplaning on the straight section was carried out on a straight stretch of smooth asphalt with a given length (100 m), covered with a layer of water with a given constant height (7 mm), which is automatically restored after each pass of the test vehicle. To test the entrance to the site was carried out with a constant speed (approximately 70 km/h) at full grip, and then performed the acceleration until it reaches a state of complete loss of grip.

Test aquaplaning on the rotation was conducted on the trajectory with a smooth and dry asphalt at the turn of constant radius (100 m), with the specified length and includes at its end portion an area with a specified length (20 m), flooded with a layer of water with a given depth (6 mm). The test was carried out at a constant speed for different values of velocity.

During the test were defined as the maximum is th centrifugal force and maximum speed of the vehicle, the corresponding full aquaplaning.

The test for the application of tractive effort was spent on direct snow covered area, while traction was determined during acceleration from 70 to 100 km/h Tractive effort was defined as the arithmetic mean of a data set of consecutive measurements.

Test if the inhibition was carried out on the straight section on snow covered ground, it was determined deceleration when braking from a given initial speed, typically accounts for 80 km/h, up to about 5 km/h Deceleration when braking is defined as the arithmetic mean of a data set of consecutive measurements.

The test to determine the behavior when driving in conditions of snow covered, dry and wet surface is performed in given areas, typically the tracks close in characteristics to the roads with traffic. By imitation of some characteristic maneuvers such as changing lanes, overtaking, "slalom" between traffic cones, entering the turn and coming out of a turn) at constant speed and during acceleration and deceleration the driver test evaluates performance tires by scoring the behavior of the latter during the aforementioned maneuvers.

Grading scale, not only is em a subjective assessment, made by the driver test, which assesses the technical means one after the other.

The test results are reproduced in Table 1, in which the scores are expressed as percentages, with 100 accepted evaluation relating to compare the bus.

Table 1
Compare busThe tire according to the invention
Aquaplaning on the turn100102
Aquaplaning on the straight section100100
Braking on snow100101
The application of traction on snow100103
Behavior when driving on a dry surface100103
Behavior when driving on wet surfaces100104
Behavior when moving on is covered with snow the surface 100104

In Table 1 values greater than 100 indicate an improvement in comparison to the control bus.

The test results show that the tire according to the invention has in General better behavior compared to the control bus.

Figure 4 shows graphs of intensity (dB (a)) noise measured inside the passenger compartment of the vehicle, the frequency for tires according to the invention (line b) and to compare bus (line a).

The graphs in figure 4 show that the tire according to the invention proved to be on average less "noisy"than comparable bus, approximately 2 dB(a), particularly at speeds less than 80 km/h, i.e. at those speeds, most interesting to the user of the vehicle.

1. The tire (1)having a tread (2), containing the Central part (L1), covering two sides of the Equatorial plane (7), and two shoulder part (L2, L3), while the Central part (L1) is separated from the shoulder portions of the tread first two circumferential grooves (3, 6), and at least two second circumferential grooves (4, 5) are located in the Central part (L1), wherein
the second circumferential grooves (4, 5) define the boundaries of the Central district of ribs (10), containing many narrow drainage grooves (20);
the centre is inoe edge (10) has a coefficient of voidness constituting less than 0.1; and
the second circumferential grooves (4, 5) are in the form of a wavy profile, mainly coinciding in phase with each other, along the circular extent of the bus.

2. The tire according to claim 1, characterized in that the circumferential grooves (4, 5) are along the circular extent of the tire in the form of a curved wave-like profile.

3. Tyre (1) according to claim 1, characterized in that the circumferential grooves (4, 5) are along the circular extent of the tire in the form of a sinusoidal profile.

4. Tyre (1) according to any one of the preceding paragraphs, characterized in that it has a functional relationship between the wavelength and step tread pattern tires.

5. The tire according to claim 1, characterized in that the second circumferential grooves (4, 5) have a width, which is less than 12 mm

6. The tire according to claim 1, characterized in that the second circumferential grooves (4, 5) have a depth that constitutes more than 5 mm

7. The tire according to claim 1, characterized in that the second circumferential grooves (3, 4) is determined in the Central part (L1) of the border of two rows (9, 11) Central blocks, where each number is located laterally with respect to the Central rib (10), each Central row (9, 11) blocks has many narrow drainage grooves (21).

8. The tire according to claim 1, characterized in that each row (9, 11) of the Central block contains many Central units (13, 14) and a lot essentially transverse kanavo the (15, 16), which limit the Central blocks (13, 14) in the circumferential direction, while essentially transversal grooves (15, 16) are at least 50% of the width of the Central row (9, 11) units.

9. The tire of claim 8, wherein the essentially transversal grooves (15, 16) have a variable width along their length with a cross section decreasing towards the Central rib (10).

10. The tire according to claim 1, characterized in that essentially transversal grooves (15, 16) have a width constituting less than 10 mm

11. The tire of claim 8, wherein each Central unit (13, 14) from a number (9, 11) Central blocks is limited in axial direction by segment (103, 106) of the first circumferential grooves (3, 6) and section (104, 105) of the second circumferential grooves (4, 5) and is limited in the circumferential direction by two essentially transversal grooves (15, 16).

12. The tire of claim 8, characterized in that the blocks (13, 14) have rounded edges.

13. The tire according to claim 1, wherein each shoulder portion contains at least one number (8, 12) of the side blocks containing many blocks (23, 24) of the shoulder area and many essentially transverse grooves (56, 66), with each number (8, 12) blocks of the shoulder area contains many narrow drainage grooves (22).

14. The tire according to item 13, wherein each block (23, 24) of the shoulder area is limited in the direction VD is eh circumference two essentially transverse grooves (56, 66) and is limited in axial direction by a part of the first circumferential groove.

15. The tire according to item 13, wherein the essentially transverse grooves (56, 66) are at least 50% of the width of the range (8, 12) blocks of the shoulder area.

16. The tire according to item 13, characterized in that the blocks (23, 24) shoulder areas have rounded edges.

17. The tire according to item 12, characterized in that the rounded edges of the Central blocks (13, 14) together with the rounded edges of the blocks (23, 24) shoulder zones create the plots of the first transverse grooves (3, 4) with a broader cross-section in the areas of intersections between the first circumferential grooves (3, 4) and essentially transverse grooves(56, 16, 66, 15).

18. The tire according to claim 1, characterized in that the slit drainage grooves (20, 21, 22) have a wavy profile, with slit drainage grooves (20, 21, 22) preferably have a sinusoidal profile.

19. The tire according to claim 1, characterized in that the slit drainage grooves (20) are in the Central rib (10) in a direction essentially perpendicular to the Equatorial plane (7).

20. The tire according to claim 7, characterized in that the slit drainage grooves (21, 22) are held in blocks (13, 14, 23, 24) with the reference direction essentially opposite to the inclination of the grooves(15, 16, 56, 66), define the boundaries of the blocks that contain them (14, 15).



 

Same patents:

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

Pneumatic tire // 2508996

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire comprises multiple circular main grooves extending in tire circumference and multiple running surfaces separated and composed by said circular main grooves in tread zone. Multiple running sections have multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes and at least 90% of sipes in outer side surface are 3D sipes. Tread zone comprises top and bottom rubber layers. Rubber hardness H1in at -10°C and rubber hardness H2in at 20°C of rubber top layer 151in in inner side area, and hardness H1out at -10°C and hardness H2out at 20°C of rubber top layer 151out in outer side area are related by relationships H1in<H1out and H2in<H2out.

EFFECT: better stability on dry and snowy surface.

18 cl, 9 dwg

Pneumatic tire // 2508995

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire tread has circular major grooves extending in tire circumference and contact parts separated and composed on said circular major grooves. Every said central zone contact part and contact parts of right and left shoulder zone has multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes in central zone and at leas 90% of sipes in outer side surface are 3D sipes in shoulder zone. Every contact parts of right and left shoulder zones has multiple transverse side grooves arranged in definite order in tire circumference. The number N-ce of transverse side grooves in central zone contact part and the number N-sh of transverse side grooves in contact parts of right and left shoulder zones are relates as N-ce>N-sh.

EFFECT: perfected design.

20 cl, 7 dwg

FIELD: transport.

SUBSTANCE: tread comprises multiple raised elements 10 confined by cutouts. At least one of said raised elements 10 has dents 2 of maximum depth H not larger than tread thickness. This dent is located in major direction confined by the dent track ends on new tread and in minor direction extending in tread depth. Dent 2 has first part 21 and second part 22. Dent first part 21 extends in minor direction between contact side 15 in new state and depth H1 equal to, at least, 40% of maximum depth H while second part 22 extends the first part 21 in tread depth. Note here that said second part 22 extends to depth H2. Dent second part 22 in major direction has at least one first section 221 and one second section 222.

EFFECT: improved performances.

10 cl, 7 dwg

FIELD: transport.

SUBSTANCE: tread 2 has rounded shoulders and is divided by the main lengthwise grooves 3 and crosswise grooves 4 in blocks 5 furnished with pockets 6, each having zigzag part 8. Lengthwise grooves 3 include at least two axially outer lengthwise grooves 3o dividing the tread 2 into shoulders Ysh and crowns Ycr wherein zigzag part 8 of pockets 6sh in shoulders Ysh features larger zigzag amplitude Wsh and larger zigzag pitch Psh that zigzag amplitude Wcr and zigzag pitch Wcr of zigzag part 8 of pockets 6cr in crowns Ycr. Inclination angle θsh of pockets 6sh relative to axial direction is smaller than angle θcr.

EFFECT: improved flotation at dry road at minimum deterioration of performances on snow-covered road.

7 cl, 7 dwg, 1 tbl

Air tire (versions) // 2506171

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. One block of air tire has first and second slitted drain grooves. Every said groove extends in tire width direction. Said grooves are regularly spaced apart in tire circumference. First and second said grooves has first parts of slitted rain groove that features linear shape if seen in the plane. The slitted drain groove second part that features zigzag shape if seen in the plane and is connected with slitted drain groove first part. First part of slitted drain groove has two surfaces of slitted and opposed drain groove walls if seen in direction perpendicular to the length of said slitted drain groove. Said first part comprises the ledge arranged on first surface of said walls and recess arranged second surface of said walls to make recess connected with ledge.

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2506170

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Proposed tire comprises sets of blocks G composed of polygonal blocks 10 arranged tightly in crown zone 1. Polygonal blocks 10 are confined by grooves 9 including first grooves 9a of W9a width and arranged between polygonal blocks 10 adjoining in tore circular direction. Width W9a of first grooves 9a is larger than width W9b of second grooves 9b located between polygonal blocks 10, adjoining and staggered.

EFFECT: better flotation on ice and snow.

7 cl, 7 dwg, 4 tbl

Pneumatic tire // 2504483

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tread pattern comprises multiple screw transverse grooves with their open ends communicated with one of two circular grooves and their extremities terminate in tread section confined on sides by circular grooves. Every skew transverse groove extends from its open end in first direction in tire circumferential line. Tread patter includes also narrow grooves with their starting parts located in the midst of appropriate skew transverse grooves. Every narrow groove extends in second direction opposite the first one to terminate at tread section. Curved and straight parts are located between open end and extremity nearby each skew transverse groove. Said extremity relates to groove straight part extending in tire circumferential direction. Closed end of narrow groove is shifted in second direction in circumferential direction relative to extremity of skew transverse groove extending there along in second direction.

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18 cl, 10 tbl, 7 dwg

Pneumatic tire // 2499680

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. Pneumatic tire has cutouts 6 extending over tire width and arranged spaced in direction along tire circumference, at least, in shoulder blocks 5a separated by lengthwise grooves extending in tire circumference and crosswise grooves 3 extending over tire width. Open cutouts 6a ad closed cutouts 6b are arranged in turns while depth of open cutouts 6a is smaller than that of closed cutouts 6b.

EFFECT: better running on icy roads, higher wear resistance.

7 cl, 5 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tread 2 has rounded shoulders and is divided by the main lengthwise grooves 3 and crosswise grooves 4 in blocks 5 furnished with pockets 6, each having zigzag part 8. Lengthwise grooves 3 include at least two axially outer lengthwise grooves 3o dividing the tread 2 into shoulders Ysh and crowns Ycr wherein zigzag part 8 of pockets 6sh in shoulders Ysh features larger zigzag amplitude Wsh and larger zigzag pitch Psh that zigzag amplitude Wcr and zigzag pitch Wcr of zigzag part 8 of pockets 6cr in crowns Ycr. Inclination angle θsh of pockets 6sh relative to axial direction is smaller than angle θcr.

EFFECT: improved flotation at dry road at minimum deterioration of performances on snow-covered road.

7 cl, 7 dwg, 1 tbl

Pneumatic tire // 2507083

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter equipped with antiskid studs. Proposed tire comprises tread with lengthwise blocks. Note here that said blocks comprises drilled blocks, each being provided with not-through hole to fit the stud therein. Said not-through hole is shifted towards the edge of drilled block. Raised not-through reinforcing part is made so that wall thickness (t) makes at least 5 mm for wall around said hole. Said blocks including drilled blocks feature identical geometry apart from said raised reinforcing part.

EFFECT: better run on ice and snow, sufficient life.

12 cl, 7 dwg, 1 tbl

Winter tire // 2482971

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Proposed tire comprises tread with circular central region wherein blocks are located as symmetric pattern on opposite sides of circular equatorial plane of the tire. Said blocks located in symmetry on opposite sides of said central plane comprises multiple spaced apart and extending across wavy segments. Separate pairs of adjacent segments are connected by one or several circular grooves. Wavy segments comprise areas of variable depth and one or more deeper area and one or more areas not that deep. Aforesaid circular groove connecting the pair of adjacent wavy segments on opposite ends of the groove cross wavy segments in areas not deep.

EFFECT: better tread adhesion in winter.

15 cl, 11 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Tread central area comprises reiterating circular row of first V-like recesses arranged at central plane. Note here that every V-like recess comprises first recess branches diverging in first circular direction and reiterating row of second V-like recesses at central plane and including second recess branches diverging in circular direction opposite the first one. Every said V-like recess is overlapped by multiple opposed second V-like recesses. Branches of first V-like recesses feature depth varying with length from 2 to 7 mm at top section of the branch at the center to branch end. Branches of first V-like recesses vary in width, like in length, from narrower top branches to wider medium branches and, further, to narrower end section so that branch volume per unit length does no vary.

EFFECT: better tread adhesion in winter.

18 cl, 11 dwg

Winter tire // 2482969

FIELD: process engineering.

SUBSTANCE: invention relates to automotive industry, namely, to winter tire tread pattern. Proposed tire comprises tread with circular central region wherein blocks are located as symmetric patter on opposite sides of circular equatorial plane of the tire. Tread comprises one or several circular recesses confined by edges of opposite blocks. Pair of two opposite block comprises block edge facing said recess and row of tenons formed along the edges of opposite blocks facing the recess and inclined radially. Tenons on the edge of one opposite block are inclined in direction opposite that on opposite block teeth inclination. Block on tread central zone recess side comprises multiple transverse pads spaced apart in circle toward lateral side. Said pads extend to line of teeth along block edge facing the recess and are leveled therewith.

EFFECT: better tread adhesion in winter.

10 cl, 10 dwg

Pneumatic tire // 2468931

FIELD: transport.

SUBSTANCE: invention relates to rodless tire tread pattern for motion on ice and snow. Tread surface has sections of contact with road cover composed of ribs divided by several main grooves, and/or multiple contact sections composed of blocks divided by grooves over tire width. Cutouts or minor openings are made on contact sections as well as multiple ledges with height smaller than depth of said cutouts. Note here that ledges are arranged to make the pattern whereby water drain channel width increases at crossing of water drain channels while water drain channels arranged in the form of mesh between ledges converge in smaller direction of the three directions. Relationship between area of multiple ledges and that of road contact surface (block-shaped) makes 0.5 or larger and 0.9 or smaller.

EFFECT: higher safety and reliability in motion on rod and ice.

5 cl, 5 dwg, 1 tbl

Pneumatic tire // 2466032

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Direction of tire rotation is set in pneumatic tire. Multiple narrow grooves are made in tire parts that stay in contact with soil. Each said narrow groove is shaped to, in fact, zigzag line composed of the chain of, in fact, V-like tread sections. Lowerable magnitude of tire parts that stay in contact with soil in direction of tire rotation differs from that of said parts in reverse direction, that is, against external force generated when tires lowers onto soil. Besides, direction of V-parts of every narrow section is set to make said lowerable magnitude of tire parts that stay in contact with soil in direction of tire rotation is smaller than that of said parts in reverse direction.

EFFECT: improved braking properties.

5 cl, 6 dwg, 1 tbl

Tool grip // 2085406

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

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