Auto tire

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire 1 comprises: circular groove 12 made in crown zone, tread runner 22 divided by said groove 12 and crosswise grooves made at tread runner. Crosswise grooves comprises first crosswise groove 32 dividing the tread runner into several blocks and second crosswise groove 51 dividing the block 42 separated by first crosswise groove into block first and second parts 61, 62. Circular groove part depth in contact with second block is smaller than that of circular groove in contact with first block.

EFFECT: higher stiffness, better tread drainage.

5 cl, 5 dwg, 1 tbl

 

The object of this invention is a tire installed on the vehicle, in particular a bus, containing the crown area with a longitudinal groove along the perimeter, and a lot of the transverse grooves, passing on the width of the tread forming an asymmetrical structure relative to the Equatorial line of the tire.

In patent document 1 describes a tire crown area having an annular groove, running along the tire circumferential side and the average treadmills, separated by an annular groove and located next to each other across the width of the tread. Lateral treadmill and the average treadmill tread contain the first transverse groove and the second transverse groove, which pass through each track. Lateral treadmill and the average treadmill divided into a number of side blocks and medium blocks around the circumference of the tire, the first transverse groove and the second transverse groove, respectively. The groove in the circumferential direction of the tire is located between the sidewall side of the block that contains the rear contact edge side of the block while rotating the tires forward, and the opposite sidewall of the middle block. The groove in the circumferential direction of the tire includes a raised portion that connects these parts of the side walls.

This bus allows to increase gastrostomy, contains rear contact edge side of the block, to reduce the deformation in the circumferential direction of the tire and lower partial wear. Further, since the raised portion formed in a transverse groove across each block, and in the annular groove, it provides drainage transverse groove, even with an increased wear of the crown zone, resulting in a raised portion becomes the contact surface with the ground.

Patent document 1: Publication of the patent application of Japan N 2005-88670.

In recent years, in order to cope with the radial force caused by sharp turns at high speed, the treadmill tread on the outer side of the vehicle when installed, perform a larger size than the size of the tread on the inner side, thereby increasing the rigidity of the vehicle from the outside, exposed to high lateral forces when cornering. However, to ensure drainage treadmill tread has a transverse groove in the width direction of the tread, and a Jogging trail tread may be separated by a transverse groove into several blocks. When the separation of the tread on a few blocks stiffness treadmill is reduced, and, in particular, treadmill tread, n is confined to the outer side of the vehicle, exposed to significant shear forces, can be deformed in such a way that will be rumpled in the annular groove. This deformation may result in reduced stability control of the vehicle.

The present invention is to solve the above problems. Respectively, are given by way of example, the present invention is to create tyres that reduce the reduce the driving stability by providing drainage with transverse grooves made on the tread.

To solve the above problems, the bus (bus 1), as shown in an example variant of implementation of the present invention, includes: crown area (crown area 2), which includes the surface of the ground contact (the contact surface with the ground 2A)intended for contact with the road surface, and asymmetrickey figure relative to the Equatorial line of the tire (the Equatorial line CL of the tire); an annular groove (external annular groove 12), made in the crown zone and passing in the circumferential direction of the tire; the treadmill protector (external second track 22), divided annular groove and held in the circumferential direction of the tire; and a set of transverse grooves made on the Jogging dorok the tread and connected with the annular groove, and passing in the direction of the width of the tread. Annular groove located on the outer side, which is a party outside of the Equatorial line of the tire when installing the tires on the vehicle. Transverse grooves include a first transverse groove (the first transverse groove 32 of the outer second track), which divides the treadmill tread into several blocks (external second block 42), and the second transverse groove (second transverse groove 51), which divides the block, separated by the first transverse groove, the first portion of the block (the first part 61 of the block) and the second part of the block (the second part 62 of a block). The blocks are separated so that the surface area of contact with the ground first part of the block is greater than the surface area of contact with the ground the second part of the unit. Annular groove includes a first region A1 in contact with the first part of the block, and the second area A2 in contact with the second part of the block. The area is designed so that the length of the annular groove in the circumferential direction of the tire, the length L2 of the second region is greater than the length L1 of the first region. The depth of the groove from the surface of contact with the ground to the bottom surface of the groove varies in the circumferential direction of the tire, and the depth D2 of at least part of the second region of the groove is less than the depth D1 of the first region CA is where it is refuelled.

The invention is illustrated by drawings, which presents the following:

Figure 1 is a tread portion of the tire in accordance with the embodiment of the present invention.

Figure 2 - external second block, shown in figure 1, on an enlarged scale.

Figure 3 is a view in section of the protector shown in figure 1. Figure 3 (a) is a view in section along the line a-a shown PA Figure 1. Figure 3 (b) is a view in section along the line B-B, shown in figure 1.

4 is a view schematically showing the shape changing unit bus, right next to the annular groove.

5 is a theoretical drawing of the tread pattern on the crown area of the tire according to another variant implementation of the present invention.

Below is a description of a variant of implementation of the tires according to the present invention with reference to the drawings. In the description below, identical or similar elements in the drawings are denoted by the same or similar numbers of positions. It should be borne in mind that the drawings are schematic, and the scale and similar parameters of all sizes differ from those in reality.

Thus, specific values of dimensions should be determined on the basis of the following description. In addition, in the drawings, the appropriate ratio can differ.

Figure 1 on the azan theoretical drawing of the crown area of the tire 1 according to the first variant implementation of the present invention. Figure 2 presents theoretical drawing of the enlarged outer second treadmill 22 tires 1 according to a variant implementation of the present invention. Figure 3 (a) presents a view in section along the line a-a shown in figure 1. Figure 3 (b) presents a view in section along the line B-B, shown in figure 1.

The tire 1 has two flanges 5, two sidewalls 3, a corona zone 2, the frame 5, brokery layer 9 and the reinforcing layer 7.

Corona zone 2 bus 1 includes several annular grooves 10, passing in the direction From the circumference of the tire, and a few tracks of the tread 20, separated by an annular groove 10, as shown in figure 1. Bus 1 contains the crown area 2 having the surface 2A of contact with the ground, which comes in contact with the road when driving. The installation position of the tire 1 when installed on the vehicle determined in advance. Side bus 1, shown to the right relative to the Equatorial line CL passing through the center of the width W of the tread, is external to the installation side, and the side of the tire, the left inner side installation. Corona zone 2 bus 1 includes several annular grooves 10, passing in the direction From the circumference of the tire, and a few tracks 20 of the tread separated annular groove 10, as shown in figure 1.

Annular groove 10 has a Central number of the core groove 11, made near the Equatorial line CL of the tire, the outer annular groove 12 on the outer mounting side, and the inner annular groove 13 located on the inner mounting side. Thus, when installing the tire 1 on the vehicle, the outer annular groove 12 located on the outer mounting side outside the Equatorial line of the tire 1. Treadmill protector 20 includes an external shoulder of the track 21 and the outer second track 22, located external to the installation side and the inner second track 23 and the inner shoulder of the track 24 located on the inner mounting side. Annular groove 10 shares a few tracks tread and passes in the direction From the circumference of the tire between treadmills 20 of the protector.

The external shoulder of the track 21 and the inner shoulder of the track 24 is located in the shoulder area of the tread. Shoulder tread area is located on the surface of the tire 1 between the sidewall and crown area 2 in contact with the road surface.

External second path 22 and the inner second path 23 are adjacent to the outside shoulder of the track 21 and the inner shoulder of the track 24, respectively, and are located closer to the Equatorial line of the tire, than each of the shoulder lanes. In particular, external to ora track 22 is located near the outer shoulder track 21 on the outer mounting side, on the other side of the outer annular groove 12. Internal second path 23 is located near the shoulder track 24 on the other side of the inner annular groove 13 on the inner installation side.

The external shoulder of the track 21, the inner shoulder of the track 24 and the outer second path 22 contain transverse groove, passing in the direction of the width W of the tread. This transverse groove includes a first transverse groove 30, which divides each track into several blocks in the direction From the circumference of the tire, and the second transverse groove 50, which divides the block, separated by the first transverse groove 30, into two or more areas.

In particular, the external shoulder of the track 21 has an external shoulder of the first transverse groove 31, which crosses the outer shoulder of the track 21. The first transverse groove 31 communicates with the outer annular groove 12. In other words, the inner edge of the first transverse grooves 31 in the direction of the width of the tread connected with an external annular groove 12. The outer edge of the first transverse grooves 31 in the direction of the width of the tread is on the outside shoulder of the track 21. In other words, the outer edge of the first transverse grooves 31 in the direction of the width of the tread does not open on the outer part of the corona zone 2. In other words, the outer edge of the first Popper is offered by the grooves 31 in the direction of the width of the tread ends on the outer shoulder of the track 21. External second path 22, which is located near the outer shoulder of the track 21, contains the first transverse groove 32 of the outer second track, connecting with an external annular groove 12 and passing towards the Equatorial line of the tire. The first transverse groove 32 of the outer second track is not connected with a Central annular groove 11. In other words, the inner edge of the first transverse groove 32 of the outer second track in the direction of the width of the tread is on the outside of the second track 22. The first transverse groove 31 of the outer shoulder of the track and the first transverse groove 32 of the outer second track are continuously on the form in terms of the crown zone 2 (for example, see figure 1 and figure 2). In other words, on a surface of the tread direction in which the first transverse groove 31 of the outer shoulder of the track goes inside in the width direction of the tread, coincides with the direction in which the first transverse groove 32 of the outer second track passes out in the direction of the width of the tread. Next, the internal shoulder of the track 24 includes a first transverse groove 33 internal shoulder footpath in the direction of the width W of the tread.

Each track is divided, the first transverse groove 30 for a few blocks in the direction From the circumference of the tire. In other words, the educated few who locks, located next to each other in a direction circumferentially of the tire and split of the first transverse groove. In particular, the external shoulder track 21 includes an outer shoulder block, separated by the first transverse groove 31 of the outer shoulder of the track, and the outer second path 22 includes an outer second block 42, separated by the first transverse groove 32 of the outer second track. Next, the internal shoulder of the track 24 has an internal shoulder block 43, separated by the first transverse groove 33 of the inner shoulder of the track.

External second external unit 42 of the second track 22 includes a second transverse groove 51, dividing the exterior of the second block 42. The second transverse groove 51 is connected with an external annular groove 12 and is directed from the outer annular groove 12 to the Equatorial line CL of the tire. The second transverse groove 51 is made with a slope across the width W of the tread, and the angle across the width W of the tread is greater than the angle of inclination of the first transverse grooves 32 external of the second track. One end 51A of the second transverse grooves 51 in the direction of the width W of the tread connected with an external annular groove 12 and the other end 51b connected to the first transverse groove 32 of the outer second track. The second transverse groove divides the external second block 42 on the first part 61, adjacent to the Central ring ka is avce 11, and the second part 62, which is not adjacent to the Central ring groove 11 and is located outside of the first part 61 of the block in the direction of the width of the tread.

Figure 2 presents theoretical drawing of the crown area in an enlarged view showing an enlarged outer second track 22 corona zone 2. The first part 61 of the block is shown as a hatched area. External second block 42 is limited to the first transverse groove 32 of the outer second footpath beside him in the direction From the circumference of the tire, extra long lines 32V first transverse groove 32 of the outer second track, the Central annular groove 11 and the outer annular groove 12. The second part 62 of the block is limited to the first transverse groove 32 of the outer second track, the second transverse groove 51 and the outer annular groove 12. The external part of the second block 42, with the exception of the second part 62, constitutes the first part 61.

The surface area of the ground contact 2A of the first part 61 of the block is greater than the surface area of ground contact of the second part 62. As the first part 61 and the second part 62 of the block adjacent to the outer annular groove 12. The outer annular groove 12 includes a first region A1, adjacent to the first part 61 of the block, and the second area A2 adjacent to the second part 62 of the block. In the direction From the circumference of the tire, the length of the Torah area A2 is greater than pancake first area A1. More specifically, the length L2 of the second region adjacent to the second part 62 of the block is greater than the length L1 of the first region A1, adjacent to the first part 61 of the block.

The second part 62 of the block are separated from one another in the direction From the circumference of the tire, and the area of the second part 62 of the block is smaller than the area of the first part 61 and the length of contact with the outer annular groove 12 of the second part 62 is greater than the length of contact with the outer annular groove 12 of the first part 61. Thus, the rigidity of the second part 62 of the block below the rigidity of the first part 61. Therefore, when exposed to large shear forces at the sharp turns and the like, the degree of thrashing deformation of the second part 62 of the block is greater than that of the first part 61. To prevent such deformation of the first part 61 of the block outer annular groove 12 is made with a different depth in the first region A1 and the second area A2.

In particular, as shown in Figure 3 (b), in the second area A2 is provided a raised portion 70. A raised portion 70 is a ledge to the outside in the radial direction of the tire on the bottom surface of the outer annular groove 12. Surface 70A of the raised portion 70 in the radial direction of the tire is located between the surface of the ground contact 2A and the bottom surface of the groove (hereinafter everywhere - the deepest bottom surface) 12A, where the depths of the outer annular groove 12 is the maximum. In areas where executed a raised portion 70, the surface of the lift portion is the bottom surface of the groove. Therefore, the bottom surface of the external annular groove adjacent to the second portion of the block does not coincide with the bottom surface of the external annular groove adjacent to the first portion of the block in the radial direction of the tire.

The depth D2 of the external annular groove adjacent to the second part 62 of the block is less than the depth D1 of the external annular groove in the area where it is adjacent to the first part 61 of the block. In this embodiment, the depth D2 of the groove is from about 60% to 90% of the depth D1. The width W2 of the groove in the second area A2 is smaller than the width of the grooves W1 in the first area A1. Thus, by reducing the depth D2 of the groove in the second region A2 in comparison with the depth D1 of the groove in the first area A1, and through the above-described reduction of the width of the grooves is achieved by increasing the rigidity of the second part 62 of the block and prevents deformation of the second part 62 to a greater extent than the deformation of the first part 61.

In particular, using the schematic view in section, shown in figure 4, will be described in detail. Figure 4 is a schematic representation of the shape change tires when the vehicle is to turn. Figure 4(a) schematically shows the first part 61 of the block. Figure 4(a) and Figure 4(c) schematically shows the second part 62 of the block. Figure 4 (b) shows the deformation in the absence of the raised portion 70. Figure 4(c) shows the deformation with the raised portion 70 provided in this embodiment.

When exposed to significant shear forces during the movement of the rotation, and the like, the surface of the external wall of the second block 42, adjacent to the outer annular groove 12, leans in this outer annular groove 12. At this time, if the depth of the outer annular groove 12 is constant over the entire area of the outer annular groove 12, the second part 62 tilts towards the outer annular groove 12, as shown in Figure 4(a) and (b).

On the other hand, as shown in Figure 4(c), due to the presence of the raised portion 70 in the second area A2 adjacent to the second part 62 of the block, the rigidity of the block and his opposition to the lateral force produced by the motion on the turn, increases, and the deformation towards the outer annular groove 12 is reduced. Thus, it becomes possible to reduce the decrease in the stability control of the vehicle due to deformation of the second part 62 of the block.

Further, in order to further explain the effect of the present invention will be explained comparative evaluation carried out for the comparative sample bus options and the implementation of the tires according to the present invention. In particular,an explanation of (1) estimation Method and (2) evaluation Results. It should be borne in mind that the scope of the present invention is not limited to these examples.

(1) Method of evaluation

Stability control while driving on a dry road surface was evaluated through the use of comparative sample tires and tire according to the present invention. Listed below are the data of tyres used for comparative evaluation.

* Tire size: 225/45R17

∗ Rim size: 7.5J x 17

∗ The internal pressure of tires: pressure specified for this vehicle

∗ Load driver: equivalent load for two persons.

The bus according to a variant implementation contains a raised portion in an external annular groove adjacent to the second portion of the block. Comparative sample tires are made with the same depth of the groove over the entire area of outer annular grooves, and it is not provided with the raised part. The bus according to a variant implementation and comparative sample differed only in the configuration of the external annular groove and were absolutely identical configuration of all other elements.

(1.1) evaluation of the stability control when driving on a dry road surface

Were driving vehicles equipped with tires of both the above types, and evaluation of sense of stability control for them. The results of the evaluation are presented in view of the comparative evaluation when the evaluation result for the comparative sample tire was adopted as the standard.

(2) the results of the assessment

The evaluation results for the above-mentioned comparative sample tires and the proposed implementation are explained with the help of Table 1.

Table 1
Comparative sampleAn implementation option
Evaluation of the stability controlStandardGood

As can be seen from Table 1, the stability control of a vehicle equipped with tires according to the former implementation was higher stability control for a vehicle with tires of the comparative sample.

In the tire according to the proposed variant of implementation, the rigidity of the crown area for external installation side improved by using an asymmetric tread pattern, in which treadmill tread located on the outer side of the vehicle when the installation is larger than a treadmill on the inner side of the vehicle. The increase in stiffness and protistas is via the influence of lateral forces when moving to the rotation, and the like, makes it possible to reduce deformation of the block, i.e. its inclination towards the outer annular groove. This gives the possibility of reducing the partial wear of the tire. In addition, the first and second transverse grooves communicating with the annular groove provides drainage and maintenance during operation.

Further, since the raised portion is made in an external annular groove adjacent to the second portion of the block, that is, in part, separated by a second transverse groove, the rigidity of the second portion of the block increases. As a result, reduces reduce stability control, due to the inclination of the second portion of the block in the annular groove.

In addition, since the depth of the ring grooves in the first region ranges from 60% to 90% of the depth of the grooves in the second region, the rigidity of the second part of the unit is significantly increased in the entire region of the annular groove, and the degree of deformation of the second portion of the block does not exceed the degree of deformation of the first part, thereby providing more effective in enhancing the stability control. The smaller depth of the ring groove can provide improved stability management, in particular the stability control on the critical modes. However, you must choose a compromise between stability control and enabled the capacity of hydroperiodide tires. In this embodiment, when selecting the depth of the groove of the second region is less than 60% of the depth of the groove of the first area, hydroperiodide bus, that is just tread in General, decreases, and therefore the depth of the groove of the second area, it is advisable to select equal to or more than 60% of the depth of the groove of the first area. When choosing the depth of the groove of the second region of 90% or less than the depth of the groove of the first area, the lower part of the groove of the second region does not coincide with the bottom part of the groove of the first region in the radial direction of the tire, and the rigidity of the second portion of the block increases. As a result, improves the stability of vehicle control.

In addition, since the first transverse external groove of the second track and the first transverse groove of the outer shoulder of the tracks are a continuation of each other, it improves the drainage that runs transverse groove.

The content of the present invention has been disclosed by describing one of the possible variants of its implementation. It should be noted that the description of the present invention and the drawings constituting part of the disclosure should not be construed as limiting the scope of the invention.

For example, despite the fact that the raised portion is made across an external annular groove adjacent to the second first portion of the block in the tire 1 according to the proposed in which the version of the implementation, this configuration is not restrictive. A raised portion may be formed at least on part of the external annular groove adjacent to the second portion of the block.

In addition, although the outer edge of the transverse grooves 31 of the shoulder track in the direction of the width of the tread ends with a dead end on the outer shoulder of the track 21 in the tire 1 according to the former implementation, this configuration is not limiting. As shown in Figure 5, the outer edge 31A of the transverse grooves 31 of the shoulder track in the direction of the width of the tread can be opened outward from the corona zone 2. The inner edge 31b of the transverse grooves 31 of the shoulder of the running track in the direction of the width of the tread connected with an external annular groove 12. Thus, the water flowing in the outer annular groove 12, is supplied to the transverse groove 31 of the shoulder track and excreted through the outer edge 31a of the transverse grooves 31 of the shoulder track that provides improved drainage characteristics.

As mentioned above, of course, the present invention includes various embodiments of, not disclosed in the present description. Thus, the scope of the present invention is determined on a specific issue solely in accordance with the claims made n the basis of this description.

It should be noted that the entire contents of the Patent application of Japan No. 2011-31664 (registered 17 February 2011) and the Patent application of Japan No. 2011-128279 (registered June 08, 2011) is given here as a reference.

Proposed by the present invention, the tire gives the possibility of increasing the rigidity of the second part 62 of the block, the contact length with an annular groove which is relatively large, and the area is relatively small, from several parts of the block formed by dividing the transverse grooves in the tread located on the external installation side affected by significant lateral force when driving on the turn. Thus, the decrease in the degree of deformation of the block when driving on the turn. In addition, many cross grooves on the tread provides drainage.

1. Bus containing:
the crown area, which includes the contact surface with the ground, intended for contact with the road surface, and an asymmetric pattern relative to the Equatorial line of the tire;
an annular groove made in the crown zone and passing around the circumference of the tire;
the treadmill tread separated annular groove and passing through the circumference of the tire; and
multiple cross grooves made on the treadmill about what the sector, United with the annular groove and passing on the width of the tread, and
annular groove located on the outer side, which is the outer side facing away from the Equatorial line of the tire when installing the tires on the vehicle,
transverse grooves include a first transverse groove, which separates the treadmill tread into several blocks, and the second transverse groove, which separates the block, separated by the first transverse groove, the first portion and the second portion of the block,
the surface area of contact with the ground first part of the block is greater than the surface area of contact with the ground the second part of the block,
annular groove includes a first region contacting with the first part, and a second area in contact with the second part of the block,
the length of the annular groove in the circumferential direction of the tire, the length of the second region is greater than the length of the first field,
the depth of the groove from the surface of the ground contact to the bottom surface of the groove varies in the circumferential direction of the tire, and
the depth, at least part of the second region of the groove is less than the depth of the first groove area.

2. The tire according to claim 1, in which the depth of at least part of the second groove area ranges from 60% to 90% of the depth of the first groove area.

3. The tire according to claim 1, in which the depth of the ring to the skill sets ranges from 60% to 90% of the depth of the first groove area to the entire area of the second region.

4. The tire according to claim 1, in which:
shoulder treadmill tread, representing the shoulder area is located outside of the annular groove in the width direction of the tread,
when this transverse groove shoulder area, passing in the direction of the width of the tread, shoulder formed on the tread, and
the transverse groove and the transverse groove of the shoulder area is inextricably connected via an annular groove on the surface of contact with the ground.

5. The tire according to claim 4, in which:
the inner edge of the transverse grooves of the shoulder area in the direction of the width of the tread connected with an annular groove 12, and
the outer edge of the transverse grooves of the shoulder area in the direction of the width of the tread is opened on the outer part of the corona zone.



 

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SUBSTANCE: proposed pair comprises front wheel and rear wheel tires. Difference (F15-R15) at 15° toe-out between axial force (F15) at front wheel toe-out and rear wheel toe-out makes at least -0.038 but not over 0.038. Difference (F30-R30), at 30° toe-out. Between front wheel axial force (F30) and rear wheel toe-out force (R30) makes at least 0.038, but not over 0.114. Axial force (F30) at 30° toe-out makes at least 0.570. Difference (F45-R45) at 45° toe-out between (F45) and (R45) makes at least 0.076, but not over 0.228.

EFFECT: better controllability and stability at turns.

3 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter. Winter tire (1) has tread (2) with relied patter composed of multiple lengthwise grooves (4) and crosswise grooves (5) isolating the blocks (6) extending radially from base surface (3) of tread (2) to make at least one lengthwise row. Every block (6) has two lengthwise lateral surfaces (7) that make the boundaries of two appropriate lengthwise grooves (4) and two crosswise side surfaces (8) that make the boundaries of two appropriate crosswise grooves (5). At least one of units (6) has lateral channels (9) each being formed at side surface (7, 8) of appropriate block (6) to extend from base surface (3) of tread (2) to top surface (10) of block (6) to prevent radial extension of trapped snow from inner section of lateral channel (9).

EFFECT: perfected grip and snow-clad roads.

19 cl, 16 dwg

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

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.

8 cl, 7 dwg, 1 tbl

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.

15 cl, 19 dwg

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

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

Tire (versions) // 2529925

FIELD: transport.

SUBSTANCE: invention relates to pneumatic tire tread design, predominantly for agricultural vehicles. Tire includes carcass and tread running along circumference of tire carcass, where the mentioned tread contains multiple tread elements located in tread pattern. Tread elements in the mentioned array of tread elements are located with one of two pitches having different lengths and in noise-reducing sequence of pitches.

EFFECT: reduced noise.

36 cl, 5 dwg

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