Pneumatic tire for vehicles

FIELD: transport.

SUBSTANCE: invention relates to pneumatic tire for vehicles, in particular to be used in winter conditions of driving. Tread is provided with multiple narrow sipes (4) which pass in transversal direction of tread in parallel to each other. Mutually opposite walls (5) of sipes contain mutually matching projections (6, 7) and recesses (16, 17). The projections (6, 7) are rounded raised areas. The projections (6) are located in separate areas in radially outer region of one sipe wall (5). In this structure, each of mentioned projections (6) has one flat side forming supporting surface (6a) oriented in radial direction and essentially perpendicular to sipe wall (5). The projections (7) are located in separate areas in radially inner region of one sipe wall (5). In this structure, each of mentioned projections (7) has one flat side forming supporting surface (7a) passing essentially in parallel to upper surface of positive profile.

EFFECT: better tire adhesion to ice-covered road surface while providing uniform wear of tire tread.

10 cl, 3 dwg

 

The invention relates to a pneumatic tire for vehicles, in particular for use in winter driving conditions, containing protector with positive profiles, such as tread checkers or tread strips, which are separated from each other by circumferential grooves and transverse grooves, and the like, with each of the positive profiles are provided with a narrow slit-like grooves which are at least essentially parallel to each other and at least essentially in the transverse direction of the tread, and the mutually opposite walls of which contain protrusions and recesses, which correspond to each other.

Pneumatic tyre for vehicles of this type are known from EP-A-0945248. The tread of this tire provided with a slit-like grooves, with one wall of the slit-like grooves contains many upland areas in the shape of a pyramid, directly adjacent to each other, while the opposite wall of the slit grooves contains a mirror-symmetrical them deepening. Ribbed plates to obtain such slit-like grooves were required to be calculated in such a way that they are resistant to repeated bending even when exposed to relatively high radial forces with respect to the thickness of this ribbed plates. This is allows to reduce the wall thickness of ribbed plates the influence on the properties of the tire is such that the walls of the slit grooves, limiting slit-like groove are in contact with each other and form the desired positive grip, even with very little bending of the tread blocks. In the result, it is assumed that the bus will have good adhesion to dry the floor.

Slit-like grooves having walls of slit-like grooves that contain elevated portions and recesses, usually referred to as 3-D slit-like grooves (three-dimensional slit-like grooves and are known in many different embodiments. Elevated portions and recesses are usually formed on a large part of the walls of the slit-like grooves and provide each other constructions and the same dimensions. To change the rigidity of the tread checkers depth of the slit grooves is changed by providing the elevated areas. In the case of a new or not worn tread wear width positive profiles or checkers is usually uneven, as the famous 3-D slit-like grooves provide only a small cross-resistance efforts, especially in the case of new tires.

The main task of the invention in the case of bus type mentioned at the beginning is the effect on the rigidity of positive profiles by using a special variant of Khujand is to establish 3-D slit-like grooves so what if you increase wear positive profiles initially effectively absorb lateral forces and, consequently, is able to distribute the district's efforts in the best way to ensure even wear.

According to the invention the objective is achieved due to the fact that, in General, the protrusions are rounded raised areas surrounded by areas of walls, remaining without structure, and the protrusions are located at selected sites in the radially outer region of one wall of the slit grooves, with each of these tabs contains one flat side, which forms a bearing surface which is oriented in a radial direction essentially perpendicular to the wall of the slit-like grooves, and at selected sites in the radially inner wall of the slit grooves are protrusions, each of which also has one flat side, which forms a bearing surface oriented essentially parallel to the top surface of the positive profile.

The flat sides of the projections and recesses arranged in a radially outer region of the walls of the slit-like grooves that are able to support each other when exposed to forces acting in the transverse direction, and, thus, limit the relative mobility of elements of positive profiles. When took the attachment of the wear tabs, which is provided with radially inner region, serve primarily to limit the mobility of elements of positive profiles in two directions along the circumference. As a result, the wear positive profile remains uniform even at this stage of tire life.

The degree of amplification of individual positive profiles in the transverse direction of the tread may correspond to a configuration profile and the corresponding provision of positive profiles in the tread. Thus, it is possible to provide, for example, the location of the majority of flat sides or all flat sides of the protrusions, which is provided with a radially outer region of the walls of the slit-like grooves on the same side of the protrusions. This measure gives a high resistance to lateral forces exerted in a particular direction.

This measure is particularly advantageous for protectors containing the external region and the internal region depending on the vehicle, where the majority of flat sides or all of the flat sides of the protrusions, which is provided with a radially outer region of the walls of the slit-like grooves in a positive profile, turned towards the outer region. Higher transverse stiffness on the outer side of the profile, which can be achieved through this is particularly advantageous for performance the ins in extreme mode, for example, when cornering at high speed.

In case protectors without some external and internal areas you should pay attention to balance, so it is advantageous, if the majority of flat sides or all of the flat sides of the protrusions, which is provided with a radially outer region of the walls of the slit-like grooves slit-like grooves in a positive profiles, facing the near edge of the tread. Alternatively, the flat sides of the protrusions, which is provided with a radially outer region of the walls of the slit-like grooves may be interleaved from ledge to ledge on one side, then on the other side of the ledges.

For optimum gain positive profiles in the transverse direction and in the circumferential direction play an important role certain dimensions of the projections. The tabs at the radially outer region of the walls of the slit-like grooves must have a maximum length of 1.5 mm to 3.5 mm in the axial direction and a maximum width of from 1 mm to 3 mm in the radial direction, and, in particular, the width should not exceed the maximum length. The tabs at the radially inner region of the walls of the slit-like grooves must have a maximum length of from 3 mm to 7 mm in the axial direction and a maximum width of from 1 mm to 3 mm in the radial direction. Moreover, the projections shall demonstrate the performance of the corresponding walls of the slit-like grooves at a distance of from 0.7 mm to 2.5 mm

Further characteristics, advantages and details of the invention are described below in more detail with reference to graphic materials, which schematically shows a variant example of implementation. The graphic materials shown:

figure 1 - view of the tread checkers tread pneumatic tires for vehicles

figure 2 is a view in section of a wall of the slit grooves of the tread pieces along the line II-II, and

figure 3 - image section along the line III-III in figure 2.

Figure 1 depicts as an example of the tread pieces 1 tread pneumatic tires for vehicles, in particular tires for passenger vehicles, suitable for use in driving conditions in winter. Each of the four tread checkers 1, shown schematically, refers to one row of tread blocks, passing in the circumferential direction, which is indicated by a double arrow U, where two rows of tread checkers are separated from each other by a circumferential groove 2 and each of the data series is limited additional circumferential grooves 2. The tread pieces 1, arranged in the same row are separated from each other by transverse grooves 3. Each tread piece 1 is equipped with a certain number of slit-like grooves 4, which preferably have a constant width b from 0.4 mm to 0.6 mm In the depicted embodiment, realized is I each tread piece 1 is fitted with two slit-like grooves 4, which are parallel to each other and transverse grooves 3, the distance between them and the distance between the grooves and the transverse grooves 3 may be essentially the same. Slit grooves 4 divide the tread pieces 1 elements 1A of the tread pieces and, in horizontal projection, have a zigzag or staggered form with alternating sequence of short sections 4A slit grooves and long sections 4b slit grooves.

Figure 2 shows the tread piece 1 open or cut along the slit grooves 4 and, thus, shows one wall 5 of the slit grooves, limiting slit-like groove 4. The second wall 5 of the slit grooves opposite wall 5 of the slit grooves is at a distance b from the shown wall 5 of the slit grooves when there is no load on the corresponding tread or tread piece 1 as a negative depicted wall 5 of the slit grooves, as shown in figure 3. The wall 5 of the slit grooves shown in figure 2, consists of surfaces 5A and 5b of the walls of the slit-like grooves corresponding to sections 4A and 4b of the slit grooves. Surface 5a of the walls are elongated rectangle, the long side of which is oriented in the radial direction and are at the maximum depth T of the slit grooves that line is there is a depth profile and ranges from 7 mm to 8 mm Similarly, surface 5b of the walls 5 of the slit grooves are smooth surfaces, passing in the radial direction. In the shown embodiment, the wall 5 of the slit grooves contains five surfaces 5b of the wall, two of which outer surface directly adjacent to each respective ring grooves 2. Elevated portions 8 of the base, reduce the depth of the end sections of the two outer sections 4b slit-like grooves and depicted on figure 2 in the form of caught in the cross-section areas of the tread rubber. Elevated portions 8 of the base reduce the depth or radial length of the end sections of the two sections 4b of the slit grooves to a depth t, which ranges from 20% to 70% So

The size of the surface 5b of the walls of the slit-like grooves in the middle of the tread pieces, decreases due to the local exalted section 8' of the base, which represents approximately trapezoidal "cut" surface 5b of the walls of the slit grooves and reduces the depth of the slit grooves 4 in this field to the value of t' which, like the value of t, can be from 20 to 70% from 20 depth T depth t, t' can be different at different elevated parts of the grounds.

Two other surface 5b of the wall located between the outer and Central surfaces 5b of the wall are at a depth of T are rectangular surfaces, each of which is provided with a protrusion 6 and the projection 7. In the shown embodiment, one of the two external surfaces 5b of the walls of the slit grooves does not contain ledge, while the other outer surface 5b of the walls of the slit groove is provided with a protrusion 6. The projections 6 are rounded raised areas, which extend in the axial direction is preferably larger than the length in the radial direction. The greatest length l1protrusions 6 in the axial direction ranges from 1.5 mm to 3.5 mm, and maximum width with1in the radial direction is from 1 mm to 3 mm and in particular less than or equal to l1. The tabs 6 protrude from the surface 5b of the walls of the slit-like grooves on the value of h (figure 3), where h ranges from 0.7 mm to 2.5 mm in Addition, the protrusions 6 is made flat on one side, thus formed bearing surface 6A, passing in the radial direction or essentially in the radial direction and perpendicular or essentially perpendicular to the surface 5b of the walls of the slit-like grooves. All the tabs 6 are located approximately at the center in the upper half of the surfaces 5b of the walls of the slit-like grooves and the minimum distance d equal to 2 mm, from the upper surface of the sacrificial checkers 1. The location of the protrusions 6 in the areas of slit-like grooves with raised areas 8,8' base is similar.

According to a preferred variant embodiment of the invention each of the support surfaces 6A of the majority of the projections 6, which is provided with a slit-like groove 4, is located on the same side of the ledge. In the embodiment shown in figure 2, the location of the anchor surfaces 6A in the presence of three protrusions 6 is the same as the protrusion 6, which is equipped with an external surface 5b of the walls of the slit grooves includes a support surface 6A formed on the other side of the ledge 6.

On each of two surfaces 5b of the walls of the slit-like grooves, passing to a depth T, radially inside with respect to each protrusion 6 and in each case in the second half of the surface 5b of the walls of the slit grooves is one additional protrusion 7. The tabs 7 are rounded raised areas in the form of poluchasa, while rounding out poluchasa proximal slit-like grooves. The side protrusions 7 facing the outer side of the tread is flat and, therefore, provided with a bearing surface 7a, which is elongated in the axial direction, has a semi-oval shape and runs essentially parallel to the top surface of the tread pieces. The maximum length l2of the projections 7 in the axial direction is greater than the length l1protrusions 6 and ranges from 3 MDO 7 mm The maximum radial extent from2protrusions 7 is from 1 mm to 3 mm Lugs 7 protrude from the surface 5b of the walls of the slit-like grooves on the value of h, as described previously.

As shown, particularly in figure 3 in conjunction with figure 2, the wall 5 of the slit grooves, the opposite is shown in figure 2 wall 5 of the slit grooves, contains surface 5b of the walls of the slit grooves, which have a local recesses 16, 17 corresponding to the protrusions 6. Due to the width b of the slit grooves, the dimensions of the recesses 16 and 17 is slightly larger than the projections 6, 7.

Slit grooves 4 are formed in the vulcanizing shape during vulcanization of the raw tire. In the segments form, which form the protectors, tightly fastened ribbed plates, with the plates attached to such relief that they contain on one side of the recesses, which form ledges on the other side of the plate. When the vulcanization of pneumatic tires deepening in ribbed plates form the protrusions 6, 7 in one set of walls of the slit-like grooves, while the tabs on the ribbed plates form the recesses 16, 17 in opposite walls of the slit grooves.

The projections 6 and recesses 16 increase the transverse rigidity of the tread pieces 1, particularly in a transverse direction, since the reference surface 6b ledge is 6 rest on a support surface (not shown, but also provided) of the recesses 16, which are the projections 6, as shown by arrows F1figure 2. In the case of a tire with an asymmetric tread, which, depending on the vehicle, contains certain outer side of the tread corresponding to the outer side of the vehicle, and a certain inner side of the tread facing the center of the vehicle, most of the flat sides, in particular all of the flat sides of the protrusions 6 in the slit grooves 4 all positive profiles must be directed to the outer side of the tread. In the case of tyres with a symmetric protectors that can be installed on the vehicle in any position, most of the projections 6 or all of the protrusions 6 should be located so that the flat sides facing respectively to the nearest edge of the tread. Alternatively, you can position the flat sides of the projections 6, which is provided with a radially outer region of the wall 5 of the slit grooves, alternating from the ledge 6 to tab 6 on one side, then on the other side of the projections 6.

In the radially inner region of the slit grooves 4 it is advantageous to increase the rigidity of the positive profile in the circumferential direction in the case of progressive wear, to ensure even wear positive is ROFILE. This is done through mutual support of the projections 7 in the recesses 17.

The invention is not limited to the illustrated example of the embodiment. Instead of the slit-like grooves having a stepped shape in horizontal projection, it is also possible to perform direct or wavy slit-like grooves, the walls of which contain protrusions 6, 7 and response deepening according to the invention. It is also possible to slit-like grooves are made according to the invention, included in the groove only one of its end sections, for example, when a slit-like grooves are positive profiles, located on the shoulder. The profile of the tread may be of any desired design, for example, slit-like grooves, made according to the invention can also be equipped with protective tape. The shape of the projections may differ from the form shown and described embodiments.

The list of reference positions

1 is a sacrificial piece

1A - tread elements checkers

2 - ring groove

3 is a transverse groove

4 - slit groove

4A - section of the slit grooves

4b - section of the slit grooves

5 - wall of the slit grooves

5A - surface wall of the slit grooves

5b - surface wall of the slit grooves

6 - lug

6A - bearing surface of the ü

7 - lug

7a - bearing surface

8 - sublime plot reasons

8' - sublime plot reasons

16 - deepening

17 - deepening

l1 -length

l2 -length

h - height

d - distance

b - width

c1 -width

c2 -width

1. Pneumatic tire for vehicles, in particular for use in winter driving conditions, containing protector with positive profiles (1), for example with the tread checkers or tread strips, which are separated from each other by circumferential grooves (2), the transverse grooves (3) and similar elements, each of positive profiles are provided with a narrow slit-like grooves (4), which are at least essentially parallel to each other and at least essentially in the transverse direction of the tread, and the mutually opposite walls (5) slit grooves (4) contain projections (6, 7) and recesses (16, 17), which correspond to each other, characterized in that, in General, the projections (6, 7) are rounded raised areas surrounded by areas of walls, left unstructured, and the projections (6) are located on separate sites in the radially outer region of the wall (5) of the slit grooves, each of these protrusions (6) has one flat side, the shedding bearing surface (6A), which is oriented in the radial direction essentially perpendicular to the wall (5) of the slit grooves and the protrusions (7) are located on separate sites in the radially inner wall (5) of the slit grooves, each of these protrusions (7) has one flat side, which forms a bearing surface (7a), which is oriented essentially parallel to the top surface of the positive profile.

2. Pneumatic tire for vehicles according to claim 1, characterized in that the majority of flat sides or all of the flat sides of the projections (6), which is provided with a radially outer region of the wall (5) slit-like grooves are located on the same sides of the protrusions (6).

3. Pneumatic tire for vehicles according to claim 1, characterized in that the flat sides of the projections (6), which is provided with a radially outer region of the wall (5) of the slit grooves are interleaved from the tabs (6) tab (6) on one side, then on the other side of these projections (6).

4. Pneumatic tire for vehicles according to claim 1 or 2, characterized in that the protector is external to the vehicle area and internal relative to the vehicle area, with the majority of flat sides or all of the flat sides of the projections (6), which is provided with a radially external region is any of the walls (5) of the slit grooves slit-like grooves (4) in a positive profiles (1), facing the outer region of the tread.

5. Pneumatic tire for vehicles according to claim 1 or 2, characterized in that the protector is made without specific external and internal region, each side of most flat sides or all flat sides of the projections (6), which is provided with a radially outer region of the wall (5) slit-like grooves (4) in a positive profiles (1)facing the near edge of the tread.

6. Pneumatic tyre for vehicle according to one of claims 1 to 3, characterized in that the projections (6) in the radially outer region of the wall (5) of the slit grooves have a maximum length (l1from 1.5 mm to 3.5 mm in the axial direction and a maximum width (c1from 1 mm to 3 mm in the radial direction, and, in particular, the width does not exceed the maximum length (l1).

7. Pneumatic tyre for vehicle according to one of claims 1 to 3, characterized in that the protrusions (7) in the radially inner region of the wall (5) of the slit grooves have a maximum length (l2from 3 mm to 7 mm in the axial direction and a maximum width (c2from 1 mm to 3 mm in the radial direction.

8. Pneumatic tyre for vehicle according to one of claims 1 to 3, characterized in that the projections (6, 7) formed in pairs, one above the other, on the walls (5) of the slit grooves of greater depth is.

9. Pneumatic tyre for vehicle according to one of claims 1 to 3, characterized in that the projections (6, 7) protrude from the wall (5) slit-like grooves on a value of from 0.7 mm to 2.5 mm

10. Pneumatic tyre for vehicle according to one of claims 1 to 3, characterized in that the projections (6) in the radially outer region of the walls of the slit-like grooves are located at a minimum distance (d) 2 mm from the upper surface of the profile.



 

Same patents:

Pneumatic tire // 2525187

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to studless tire tread pattern. Tire (1) tread (2) has several (5R) crown blocks (5b) separated by crosswise crown grooves (8), two rows (6R) of mid blocks (6b) separated by mid crosswise grooves (9) and two rows (7R) of shoulder blocks (7b) separated by shoulder crosswise groves (10). Every crown crosswise groove (8) is level in lengthwise direction with one crosswise crown mid groove (9) so that crosswise groove (8) is located in area (Mc) of the mid crosswise groove confined by 1st and 2nd crosswise straight lines (Za and Zb). The latter extend through 1st and 2nd extreme ends (9a, 9b) of the mid crosswise groove (9), respectively. Longitudinal length of crosswise mid groove are (Mc) makes at least 25% but not over 50% of pitch length (P) confined by 1st extreme ends (9a, 9b). Are (Mc) of mid crosswise groove does not overlap anyone shoulder crosswise groove (10).

EFFECT: better bite.

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Pneumatic tire // 2524522

FIELD: transport.

SUBSTANCE: invention relates to vehicle tread pattern. Pneumatic tire (1) contains tread (2) which includes projections (23) formed by longitudinal grooves made in longitudinal direction of tire and by transversal grooves (24) crossing longitudinal grooves. The transversal grooves (24) in longitudinal direction of tire form multiple pitches (P1, P2 and P3) of tread pattern. In this structure, in the tread (2) shoulder, as tread pattern pitch decreases the volume ratio of transversal grooves (24) in the volume of portion corresponding to tread pattern pitch increases, and in the central zone of tread (2), as tread pattern pitch decreases the volume ratio of transversal grooves in the volume of portion corresponding to tread pattern pitch decreases.

EFFECT: higher stability of vehicle driving while keeping tread uniformity.

4 cl, 5 dwg

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

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Pneumatic tire // 2521052

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

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EFFECT: better road grip on dry road and snow.

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Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

FIELD: transport.

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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

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 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

Pneumatic tire // 2526573

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile tire intended to be used on ice. On the surface of tire crown zone located between both edges of tread there are multiple grooves positioned in circumferential direction of tire; multiple transversal grooves located in transversal direction of tire. Each of transversal grooves has point of curvature between main grooves and/or between main groove and tire edge so that they have convex from in circumferential direction of tire. Multiple main grooves and multiple transversal grooves from multiple separate blocks each one of which includes circumferential projection of shape that coincides with convex form of transversal grooves. Each of the blocks contains at least one transversal lamel located in tire transversal direction and coinciding in its shape with transversal grooves where transversal lamel size in tire transversal direction is equal to size of block with transversal lamel located in it if both ones are projected on one plane including tire rotation axis and perpendicular to block surface.

EFFECT: better tire friction properties on ice.

10 cl, 6 tbl, 14 dwg

Pneumatic tire // 2523539

FIELD: transport.

SUBSTANCE: pneumatic tire 1 having excellent snow-running characteristics while keeping control stability and resistance to uneven wear, including tread 2 containing a pair of longitudinal crown grooves running continuously in longitudinal direction of tire at both sides of tire equator C and having edges, where one edge 3m runs in zigzag fashion, so that L-shaped sections 3s of groove edge are continuously interconnected in tire longitudinal direction, and the other edge 3n runs in corrugated manner so that arc-shaped sections of groove edge 3o having arc-shaped convexity towards groove centre are continuously interconnected in tire longitudinal direction where each section 3s of L-shaped groove edge includes long portion 3c inclined at angle of 1 to 20° relative to longitudinal direction, and short portion 3t with longitudinal length less than this value for long portion 3c and inclined in direction opposite to direction of the mentioned long portion 3c relative to longitudinal direction.

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

15 cl, 19 dwg

FIELD: transport.

SUBSTANCE: tire has tread (1) including at least one groove (3) of circular orientation and multiple raised elements (21, 22). Note here that every said raised element comprises contact side (11) with crosswise width Lt and lateral walls (210). Note also that there is at least one raised element with multiple noise killing devices. Note that every said device has elongated cavity (4) of total volume Vc to open toward lateral wall (210). Note that said cavity features total length Lc larger than said length Lt and geometry that includes several interconnected parts (40, 41, 42, 43, 44, 45). Note also that length Lc makes the sum of parts of said cavity. Note that every said cavity (4) extends over the entire length Lc with notch (5) extending radially outward out to rolling surface. Note that sum tread sum Ly of lengths in projection in crosswise direction of every cavity is at least 1.5 times larger than the sum Lx of length in projection if the cavity circumferential direction.

EFFECT: perfected noise killing.

9 cl, 8 dwg

Pneumatic tire // 2521455

FIELD: transport.

SUBSTANCE: pneumatic tire includes tread section which contains ring grooves (2-4) running in circular direction of tire, as well as lateral grooves (5, 6) running in direction of tire width, and multiple road-contacting blocks (7), separated by ring and lateral grooves. Each of road-contacting blocks contains lamellae (8), which run from tread running surface inside blocks to specified depth in radial direction of tire, herewith, each one of lamellae has end section communicating with at least any one of ring and lateral grooves. At least one of multiple lamellae contains widening ring-shaped section on its inner end in radial direction of tire. Herewith, the widening ring-shaped section is increased in its diameter gradually and smoothly running to side walls of road-contacting block.

EFFECT: creation of pneumatic tire with high drainage effect, as well as prevention of tearing lamella in tire tread.

9 cl, 12 dwg, 1 tbl

Pneumatic tire // 2521052

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

9 cl, 5 dwg, 1 tbl

Automotive tire // 2521033

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

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

FIELD: road vehicles.

SUBSTANCE: pneumatic tire tread cap has grooves limiting raised repetitive patterns, at least one of which is provided with first cuts and second cuts, each cut being limited by two main side surfaces interconnected by end surface. Bottom surfaces of first cuts and top surfaces of second cuts are functionally intercoupled so that, at any degree of wear of pneumatic tire tread, length of edges on rolling surface is at least 75% of length of said edges in new tire tread cap.

EFFECT: improved adhesion of tread and road at any wear, reduced noise in running.

11 cl, 12 dwg, 1 tbl

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