Perfected noise killers for tires

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

 

The technical FIELD

The present invention relates to a tyre tread and, in particular, to devices, are integrated into these protectors and providing noise reduction during rolling.

PRIOR art

As you know, tires for passenger cars contain frame reinforcement that at the present time in most cases is radial; in this configuration, the gain frame reinforcement are arranged in such a way as to form an angle greater than or equal to 80 degrees, with the County direction (i.e. amplification is contained in a radial plane (the plane containing the axis of rotation) or form with this radial plane angle not more than 20 degrees).

As you know, these tyres contain valves comb containing many reinforcements, immersed in the material on the basis of the elastomer. This valve crest radially outside covered with a tread of a rubber material, and this protector has a surface, called surface raceway is designed to enter into contact with the road during rolling.

To provide the necessary level of security, in particular, in the rain, as you know, the protector perform a variety of flutes overall district (or longitudinal) orientation and grooves of the total transverse orientation (parallel or is the s at a small angle to the axis of rotation).

The lack of longitudinal grooves is the vibration of air circulating in these grooves, in particular, in contact with the road. These vibrations give rise to resonance phenomena, creating noise while rolling.

Published patent application JP-01-191734 considers this mechanism is proposed to reduce the noise produced by vibrating air inside these grooves, by creating in the thickness of the tire tread for heavy vehicles spherical cavities, communicating through a channel of small cross section with a longitudinal groove. This makes it possible to implement a sort of resonator, operating on the principle of the Helmholtz resonator. Indeed, due to its precisely defined volume of this cavity is fulfilling this role and helps to reduce the influence of certain frequencies of vibration of the air circulating in the grooves by passing in contact with the road surface. For each selected frequency should determine the appropriate volume of these cavities. This device is applicable for truck tires, because, as a rule, the thickness of the tread elements is large compared to the treads of tires for passenger cars.

In the case of the car, since the thickness of the tread is relatively small (i.e. less than 10 mm), these resonators are necessary in order to apologeti as far away from the rolling surface of the tread and, in particular, at a depth exceeding the depth of the grooves, or at least to the depth of the mentioned grooves, reduced by the allowable value (showing indicators of wear, made in the form of protrusions made of rubber, which is provided at the bottom of the grooves and the radially outer surface which shows the limit of wear of the tread, which should not be exceeded in order to maintain a satisfactory level of security). If in the case of tires, designed for freight car, such as described in JP-01-191734, can be molded and to separate the tire from the elements form, forming a hemispherical cavity, since these cavities open into the grooves, then this causes problems with tires for passenger cars, even if just to consider the larger the length of these cavities (this length is necessary to obtain the appropriate volume).

Another disadvantage of the protector described in the document JP-01-191734, is that a spherical cavity of relatively large volume can affect how the containing rubber element will be flattened by contact with the road during rolling, and, in particular, on the distribution of the contact pressure. In addition, cavity, described in JP-01-191734, are not sufficient durability because after partial wear of the tread these cavities open onto the surface of the rolling: and the volume is no longer saved, and their work as a resonator is violated because of this.

In the patent application published under number WO 2009/095288, the applicant has proposed a new protector containing cavity, forming the resonators to reduce resonant noise of the groove when coming into contact with the road surface. These cavities are designed so that they are almost not sensitive to the wear of the tread, and so it is easy to mould and separate from form, while providing excellent control of the volume of each cavity so that she could fully perform the role of a resonator installed on the resonant frequency. Under almost insensitive should be understood that the volume of the cavities is not changed until the tread wear reaches 2/3 of the thickness of said tread. After such wear open cavity on the rolling surface and form parts of the grooves serving as a water reservoir, located on the road surface. Resonators, in question, can be well-known Helmholtz resonators or quarter-wave resonators.

The use of Helmholtz resonators or quarter-wave resonators in the projectors of tires for passenger cars requires an appropriate volume of the cavity, which is sometimes incompatible with the thickness of the tread and the width of the ribs or relief of elementiterator. This volume of the cavities can lead to a significant reduction in the transverse rigidity of the tread, in particular when this protector are tangential efforts transversely, i.e. in the direction parallel to the axis of rotation of the tire containing such a protector.

Definition

The Central Equatorial plane: the plane perpendicular to the axis of rotation and passing through the point of the tire, radially most remote from said axis. This plane divides the tire into two equal or substantially equal parts.

The block is embossed element, which is formed in the tread, is limited by the depressions or grooves and includes side walls and a contact side, intended to enter into contact with the road surface.

The rib is a relief element, limited by two grooves one orientation; this rib has two lateral side and the contact side, a secant sides, forming edges.

Under radial direction in this document you must understand the direction perpendicular to the axis of rotation of the tire (the direction corresponds to the direction of thickness of the tread).

Under axial direction should understand the direction parallel to the axis of rotation of the tire.

Under the district or longitudinal direction should be same direction, the same is built perpendicular to the axial direction and the radial direction. This circumferential direction is tangent to any circle centered on the axis of rotation of the tire.

The INVENTION

The present invention is to solve the above problems and the use of resonators with an appropriate volume of the cavity, while limiting the effect of decreasing the hardness of the protector when the protector is subjected to transverse stresses.

In connection with this object of the invention is a protector having a rolling surface that is designed to enter into contact with a road surface during rolling of the tire, and the tread includes at least one groove of the total circumferential orientation (not necessarily a straight - it can be zigzag) and many relief items (ribs or blocks), each of these relief items has side walls and a contact side with a transverse width Lt (distance measured between side walls of the element), and this pin side forms a part of the surface is rolling, with some of these side walls partially restrict the grooves of the total circumferential orientation

provides at least one relief element with multiple devices for suppressing resonance noise generated in the ring groove adjacent the said relief element

PR is that each noise-cancelling device is made in the relief element and contains mainly the elongated cavity, with a total length Lc and the total amount of Vc,

moreover, this cavity is fully formed in the protector to effectively ensure its function as a noise-canceling device

moreover, this cavity is opened at the side wall bounding the ring groove in which it is necessary to reduce resonant noise,

however, in projection onto the rolling surface of the tread in the new state of this cavity has a total length Lc is greater than the transverse length Lt of relief element, and geometry, which includes several interconnected parts of the cavity, the length Lc is equal to the sum of the lengths of all parts of the cavity,

in fact the part of the cavity have a total length of projection in the circumferential direction, is equal to Lx, and the total length of the projection in the transverse direction, equal Ly, and these total projected length Lx, Ly, respectively, the sum of the lengths of the projections in the circumferential direction or in the transverse direction of each part of the cavity,

each cavity is continued along its entire length Lc notch, passing radially outwards, opening on the surface of the rolling element.

The protector is characterized by the fact that the total length Ly in the projection in the transverse direction of at least 1.5 times the total length Lx in the projection in the circumferential direction.

Preferably the total length Lc of the cavity is equal to at least twice, and preference is sustained fashion equal, at least three times the width Lt of relief element; you can include the length of the cavity is much more than twice the width Lt of relief element. Thus, for the total amount of Vc cavity, which is determined depending on the frequency at which you want to suppress the resonance noise can be reduced average cross section Sc of each cavity. The invention allows to distribute this total volume of the cavity in such a way as to provide a lesser violation stiffness relief element extending sufficiently above mentioned cavity and distributing a major part of the length of the cavity in the transverse direction.

The resonators in accordance with the invention, which significantly reduce resonant noise of the tread grooves allow you to achieve a satisfactory balance between the longitudinal rigidity and lateral rigidity of the tread, which is subjected to impacts from the road surface during rolling.

Preferably, each cavity is fully formed in the protector so as to effectively ensure its function as a noise suppressing device, at least for 2/3 of the life of the tread (that is, the cavity does not appear on the rolling surface before wear on 2/3 of the thickness, starting from the new state).

Cavity in accordance with the invention can PR is dostavljati a Helmholtz resonator or a quarter-wave resonator. In the particular case of the Helmholtz resonator, each cavity contains the main part of the middle section Sc and the portion of smaller cross-section Sr (smaller than the cross-section of Sc) and the length Lr: the volume of this part of smaller cross-section represents a very small fraction of the total volume Vc. This part of smaller cross-section extends into the groove in which it is necessary to suppress the resonance noise, the total volume Vc cavity includes the volume of this part of smaller cross-section and length Lc also includes the length of this part of the smaller section.

For cavities of type quarter-wave resonator section Sc is constant along the length Lc of the cavity.

According to a variant implementation of the invention, the notch continuing the cavity in the direction of the rolling surface, has an average width of less than 0.6 mm

According to another preferred variant implementation of the invention, in order to ensure the effectiveness of the resonators, the notch contains a plot of a notch, starting from the cavity and forming an angle And at least 10 degrees from a perpendicular to the rolling surface passing through the point of intersection of the notches with the cavity, so that the notch is closed, at least near the cavity to prevent any change of the total Vc mentioned cavity when you enter this cavity into contact with the road surface.

To perform us the conditions of the invention, preferably, each cavity had a form that contains at least two parts of the total transverse orientation and at least one part of the interconnection of these parts of the total transverse orientation. The greater the number of parts of the transverse orientation, the greater the total length of the projection in a transverse direction, and the less the influence of the presence of these cavities to reduce stiffness.

Preferably used in the form of cavities containing at least three parts of the transverse orientation. The distance between the parts of the transverse orientation determined in such a way as to avoid too pronounced influence on the tread stiffness in compression.

To obtain long-term noise during operation, preferably protector equipped with wear indicators on the bottom of the at least one groove, and the wear indicator has a height h, measured relative to the bottom of the grooves, each forming a resonator cavity has a top forming at a distance from the rolling surface, at least equal to the depth of the grooves is reduced by the height h of the wear indicator. Thus, each cavity retains its role resonator, while the tread wear reaches the maximum level permitted by statutory regulations.

BRIEF DESCRIPTION of DRAWINGS

Al is further distinctive features and advantages of the invention will be more apparent from the following description of embodiments of the invention, presented as non-restrictive examples, with reference to the accompanying drawings, on which:

figure 1 depicts a known protector.

Figure 2 is a view in section along the plane II-II of the protector shown in figure 1.

Figure 3 is a partial view of a protector in accordance with the invention with the first variant of the resonator in the form of the letter N.

4 is a view in isometric of the tread shown in figure 3.

5 is a view in section along the line V-V in the tread shown in figure 3, without contact with the road surface.

6 is the same view in section, as in figure 5, at the time of entering into contact with the road surface.

7 - other options cavities forming the resonator.

Fig is another variation of the cavity having the General shape of the letter Z and forming a quarter-wave resonator.

DESCRIPTION of FIGURES

To facilitate the examination of the figures in the description of the variants of the invention used the same notation for elements having the same structural or functional purpose.

Figure 1 shows part of a known protector 1 described in the patent application published under number WO 2009/095288. This figure 1 shows the three ribs 2 district orientation, two limiting grooves 3. Each rib has a width Lt. To reduce noise due to resonance of the air in the two grooves 3, in the Central ribs which form many of the cavities 4, having the shape of letter "L", with each of the branches of this cavity has essentially the same length. Thus, the amount of Ly projections of the total length Lc of this cavity in the circumferential direction (indicated in figure 1 the direction YY') is essentially equal to the sum of Lx projections of the total length Lc of the same cavity in the transverse direction (indicated in figure 1 the direction XX'). In fact, put all the components in the direction XX' and all the components in the direction YY'to get the Lx and Ly, respectively.

Figure 2 shows a view in section on the plane the trace of which is shown in figure 1 by the line II-II. This figure 2 shows the rib 2 in the direction of its thickness. The cavity 4, forming the resonator has an essentially round cross-section Sc and continued in the radial direction towards the contact surface 11 of the rib 2 zigzag grooves 5, is configured to be closed when coming into contact with a road surface to control the total volume Vc of the cavity 4.

Figure 3 shows the first variant of the tread 1 tyre size 225/55 R 16, and this protector is equipped with many devices 4 suppression of resonant noise in accordance with the invention.

Under this option, the protector has two circumferential grooves 3, bounding the Central rib 21 and two side ribs 22.

The Central rib 21 of a width Lt, is equal to 35mm, contains many cavities 4 total length Lc, with each cavity has the General shape of the letter "H", the total length Lc is equal to the sum of the lengths of all branches of this form. Each cavity 4 forms a Helmholtz resonator with a total volume Vc, and this volume includes part 40 length Lr, having a volume Vr, the smaller the volume Vc of the cavity, and the cross-section, a lower section Sc cavity. This portion 40 of the cavity opens into the side wall 210 of the Central rib, as shown in figure 4, to obtain a Helmholtz resonator.

Each cavity 4 contains several interconnected parts of the cavity: the first part 41 of the cavity line shape is made in the continuation of part 40 of a smaller cross-section and has a length L1 equal to 24 mm Parallel to this part of the cavity length L1 run another portion 42 of the cavity, having essentially the same length L1. These two parts 41, 42 of the cavity is oriented parallel to the transverse direction YY' (i.e. perpendicular to the district direction indicated by the direction XX').

In addition, to ensure continuity between the volumes of the parts 41, 42 length L1 is provided by the portion 44 of the cavity length L2, in this case equal to 28 mm This part 44 of the cavity length L2 has a round cross-section with the same diameter as the cross section of the parts 41, 42 of the cavity length L1.

The total cavity length Lc (this length Lc is equal to the sum of the lengths of all parts 40, 41, 42, 44, the independence of the IMO, are these the length of the transverse or circumferential) is clearly much greater than the width Lt of the rib 21, as measured in the transverse direction (in this case, the length Lc equal to 76 mm, and the width Lt is equal to 33 mm).

In addition, the cavity 4 is continued radially outward and along its entire length Lc notch 5 passing between the points bounding the said cavity and located radially outside of the cavity, to the contact side 11 of the rib 21. This notch 5 allows, in particular, to produce the formation and separation of form from the cavity 4 inside the protector. Of course, it is preferable to perform this notch 5 in such a way that it was closed near the cavity 4 to control volume Vc mentioned cavity at the time of entering into contact with the road surface, as shown in figure 5 and 6 in section along the line V-V of figure 3. Figure 5 in section showing the position where this part is located outside of contact with the road surface, while figure 6 in the same section shows the position at the time of entering into contact. Figure 5 shows that each cross section of the parts 41 and 42 of the cavity is continued to the side surface 11 of the rolling grooves 5 wavy shape in depth. Between the parts 41 and 42 of the cavity is the part 44 of the cavity, which ensures the continuity of the volume of the cavity. Figure 6 shows that due to its wavy geometry in the depth of the notch 5 is closed near p is lost 4 and along the length Lc of the cavity 4 under the action of the efforts of contact with the road surface and provides thus, a constant volume Vc of the cavity to the above-mentioned cavity is able to operate as a resonator.

Figure 4 in isometric partially depicted protector, shown in figure 3. This figure 4 shows the cavity 4 and, in particular, the portion 40 of smaller section of this cavity opening on the side 210 of the rib 21, a cavity 4 is continued in the radial direction to the surface 11 of the rolling grooves 5, which opens part 51 notches on the lateral side 210. In this embodiment, the cavity 4 is formed on the corresponding depth to open for the rolling surface to the permitted limit of wear of the specified at least one wear indicator (not shown). In this embodiment, when the parts 41, 42, 44 of the cavity opens onto the rolling surface, they act as grooves, at the same time forming new edges, and for removing water that may be present at the contact.

In this case, the amount Ly lengths in the projection in the transverse direction (indicated by the direction YY' on figure 3) the cavity is equal to 48 mm (twice the length L1 of the parts 41, 42 of the cavity), while the sum of the lengths Lx in the projection in the circumferential direction (indicated by the direction XX' in figure 3) is equal to 28 mm (length L2 of part 43). In this case, the ratio Ly/Lx is 1.7.

Thus, it is possible to have a cavity length 1.7 times larger in the transverse direction than in the neighborhood is the second direction, that gives an advantage from the point of view of the stiffening rib. Indeed, each cavity in accordance with the invention leads to a smaller change in the transverse stiffness of this element.

In the first example, the tire in accordance with the invention, each cavity formed in the rib, made entirely in the protector and provides effective suppression of resonant noise, at least for 2/3 of the life of the tread (that is, the cavity does not appear on the rolling surface before wear on 2/3 of the thickness, starting from the new state).

7 at the same protector shows two options for performing cavities, according to which two ribs contain many cavities, with each cavity forms a Helmholtz resonator with a total volume Vc. On side rib 22 of the tread, each cavity 4 consists of three parts 41, 42, 43 of the cavity length L1 each oriented parallel to the transverse direction (the axis of rotation of the tire, indicated by the direction YY'), and two parts 44, 45 of the cavity, oriented in the circumferential direction, connecting pairs part of the cavity, oriented transversely. All the parts 41, 42, 43, 44, 45 cavity essentially have the same circular cylindrical form, although this form can be adapted depending on the needs). One of the parts 42 of the cavity, oriented parallel to pop the river direction, goes to the side of the rib through the portion 40 of the cavity of smaller cross-section setting the message cavity 4 with groove 2, in which it is necessary to suppress the resonance noise. Each cavity 4 is continued radially outward notch 5, the intersection of which with the surface 220 rolling in new condition reproduces the geometry of the cavity (the three branches of notches parallel to the transverse direction, and two district branches connecting the previous). These cavities 4 are designed to reduce resonant noise of the groove 3 between the side rib 22 in which they are formed, and the Central rib 21.

In the Central rib formed many cavities 4', acts as a Helmholtz resonator, and these cavities 4' essentially have the same geometry as described above cavity 4, formed in one side of the rib. The only visible difference from the previous cavities is the geometry of the notches 5'between each cavity 4' with the contact side of the rib. Each notch 5' describes a zigzag trail to the contact side, and on any surface inside of the tread between the rolling surface and the cavity 4'; due to this increase interaction are against each other of the walls formed by this notch. This zigzag trail notches 5' is added zigzag geome the model in the direction of the thickness of the tread. Under zigzag form, you should understand that you can select any geometry that contribute to the mechanical locking of the walls bounding the notch and located against each other. The function of these cavities 4 is the reduction of the resonant noise of the groove 3 between the side rib 22, not containing cavities, and the Central rib 21.

On Fig presents another variant of the invention, in which use of a quarter-wave resonators of the type in the tread containing two circumferential grooves 3, limited by the ribs 2 of the same width. Rib, the most outside in the axial direction, contain many cavities 4, each of which has the shape close to the shape of the letter "Z". In this embodiment, each cavity 4 has a total length Lc, which is essentially three times the width Lt of each rib, and contains a linear part 46, 47, 48 cavities interconnected by means of connecting parts 71, 72, each part 46, 47, 48 cavity has a tilt with respect to the transverse direction at an angle other than zero angle. The end 49 of each cavity opens into the side wall of each rib to the cavity 4 formed of a quarter-wave resonator. In this embodiment, it is seen that the main part of the total length Lc of each cavity is oriented in the transverse direction (in a ratio of more than 1.5). In this embodiment, all of the cavity 4 orients ofany the same on one rib, on the other rib have a symmetrical orientation relative to the circumferential direction XX'. Of course, you can choose to use the same orientation for all cavities, regardless of the ribs. You can also on one of the intermediate rib to position cavity to reduce resonant noise in one groove and cavity to reduce resonant noise in the other groove, these grooves limit the intermediate rib. In addition, each cavity continue notch, is designed to close near the mentioned cavity.

The distance between the cavities, regardless of the considered options, choose, therefore, to provide a compromise between the need to suppress the resonance of noise and the need to limit stiffness.

It is obvious that describes and presents various options invention is not limited to only these options, it is possible to make various modifications without going beyond the scope defined by the claims. In particular, it is possible for one protector to combine multiple cavities type of Helmholtz resonators and cavities type quarter-wave resonator. You can also apply such a noise-cancelling device in the case of grooves, a limited set of blocks. In another embodiment, each cavity can continue not in n the Board of the rolling surface, and inside tread: this involves the separate manufacture of the protector and its subsequent incorporation into the tire.

1. Bus containing protector (1)having a surface (11) of the rolling element, which is designed to enter into contact with a road surface during rolling of the tyre, and containing at least one groove (3) total district orientation and many relief items (21, 22), each of these relief items contains the contact side (11) of the transverse width Lt, and this pin side forms part of the rolling surface and the side wall (210), while some of these side walls partially restrict the grooves of the total circumferential orientation, provides at least one relief element with multiple devices for suppressing resonance noise generated in the ring groove, each device is made in the relief element and contains a cavity (4) is elongated, with a total length Lc and the total volume Vc, and the cavity (4) is completely molded in the tread and opens into the side wall (210), a limiting ring groove in which it is necessary to reduce resonant noise, and a cavity (4) has a total length Lc is greater than the transverse length Lt of relief element, and geometry, including several interconnected parts(40, 41, 42, 43, 44, 45) cavity, if e is ω length Lc is equal to the sum of the lengths of all parts of the cavity, in fact the part of the cavity have a total length of projection in the circumferential direction, is equal to Lx, and the total length of the projection in the transverse direction, equal Ly, and these total projected length Lx, Ly, respectively, the sum of the lengths of the projections in the circumferential direction or in the transverse direction of each part of the cavity, each cavity (4) continued along its entire length Lc notch (5)passing radially outwards, opening on the surface of the rolling element with the specified protector is characterized by the fact that the sum Ly lengths in the projection in the transverse direction of each cavity, at least 1.5 times greater than the sum of lengths Lx in the projection in the circumferential direction of each cavity.

2. The tire according to claim 1, characterized in that the total length Lc of each cavity relief element is equal to at least twice the transverse width Lt mentioned relief element.

3. The tire according to claim 1, characterized in that the notch (5) has an average width of less than 0.6 mm

4. The tire according to one of claims 1 to 3, characterized in that the notch (5) contains a section (51) of a notch, starting from the cavity and forming an angle And at least 10 degrees from a perpendicular to the rolling surface passing through the point of intersection of the notches with the cavity, so that the notch (5) closed, at least near the cavity (6), ensuring conservation of total Vc mentioned Polo is ti (6) when you enter this cavity (6) in contact with the road surface.

5. The tire according to claim 1, characterized in that at least one cavity has a shape that contains at least two parts of the total transverse orientation and at least one part of the interconnection of these parts of the total transverse orientation.

6. The tire according to claim 1, characterized in that the protector is equipped with indicators (22) wear on the bottom, at least one groove (2), and this indicator (22) wear has a height h, measured relative to the bottom of the grooves, with each cavity (6) has an upper generatrix (65)located at a distance from the rolling surface, at least equal to the depth of the grooves (2), reduced by the height h of the wear indicator.

7. The tire according to claim 1, characterized in that at least some of the cavities form a Helmholtz resonators.

8. The tire according to claim 1, characterized in that at least some of the cavities form a quarter-wave resonators.

9. The tire according to claim 1, characterized in that each cavity (4) formed in the thickness of the tread in such a way as to ensure its effectiveness, at least for 2/3 of the life of the tread.



 

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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

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 // 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.

SUBSTANCE: tread contains multiple grooved obstructing elements (4) which are formed by and located in circular grooves (2). Herewith, obstructing elements (4) go from bottom (21) of circular groove (2) and blocks at least 70% of cross-section area of circular groove (2). Bending parameter of grooved obstructing elements (4) is determined as E·I/(h3l), where E is module at 10% elongation of material used for grooved obstructing elements, I is inertia moment of grooved obstructing element cross-section, h is height of grooved obstructing element, and l is width of grooved obstructing element, and ranges from 250 Pa to 350 Pa.

EFFECT: providing grooved obstructing elements wear to degree equivalent to tread section wear degree while reducing noise caused by resonance of air columns and maintaining retraction characteristics.

6 cl, 6 dwg, 1 tbl

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: 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

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.

EFFECT: optimised tire performances at wet road coat, higher wear resistance.

18 cl, 10 tbl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to tire tread with flexible device to decreased noises related with resonance of air flowing along tire grooves all over tire circumference. Tire tread 1 is made from rubber with Shore hardness of at least 65. Said tread has at least one groove of width W and depth D. Said groove 2 is confined by two opposite tread parts connected by groove bottom 21. tread comprises multiple closing membranes 4 formed in at least one groove 2. Every closing membrane 4 closed groove 2 at, at least, 50% of groove cross-section. Note here that every closing membrane 7 has mean thickness not over 2 mm and can bend at fluid passage. Closing membranes 4 are made of material with Shore hardness of not over 62. Note here that said hardness is smaller than that of the tread.

EFFECT: decreased resonance noises.

8 cl, 7 dwg

FIELD: tire industry.

SUBSTANCE: proposed tire is provided with tread having two deep circular grooves separating central zone from two side shoulder zones furnished with shoulder blocks. Sum of width values of shoulder zones in tread is either equal to or less than 60% of its summary width. Width of each shoulder zone is not less than 20% of summary width. Each circular groove at side separated from central zone adjoins continuous path from which cross grooves branch to limit shoulder blocks.

EFFECT: increased wear resistance of tire.

10 cl, 9 dwg

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