CN111094017B

CN111094017B - Pneumatic tire

Info

Publication number: CN111094017B
Application number: CN201880051800.2A
Authority: CN
Inventors: 安永智一; 谷口二朗
Original assignee: Toyo Tire Corp
Current assignee: Toyo Tire Corp
Priority date: 2017-08-31
Filing date: 2018-08-16
Publication date: 2022-02-11
Anticipated expiration: 2038-08-16
Also published as: JP6912973B2; WO2019044514A1; CA3073189A1; RU2748524C1; JP2019043310A; CA3073189C; CN111094017A

Abstract

Comprising: a plurality of shoulder blocks 6 provided in the sidewall portion 2, partitioned by a communication groove 8 extending in the tire circumferential direction and a lateral groove 7 extending in the tire width direction, and arranged in parallel in the tire circumferential direction; auxiliary ribs 10 provided to the sidewall portion 2, extending in the tire circumferential direction along the shoulder blocks 6; and a protrusion 11 provided to the sidewall 2, extending from the auxiliary rib 10 into the lateral groove 7. This makes it possible to enhance the rigidity of the auxiliary rib, to exhibit the snow removing performance of the lateral groove, and to suppress the amount of longitudinal deflection of the side wall portion.

Description

Pneumatic tire

Technical Field

The present invention relates to a pneumatic tire.

Background

Heretofore, the following pneumatic tires are known: on the tire surface, turbulence generation protrusions extending from the inner circumferential side toward the outer circumferential side are provided at intervals along the tire circumferential direction (see patent document 1).

However, in the conventional pneumatic tire described above, although cooling performance can be obtained by providing the turbulence generation protrusion only in the side portion, it is not clear whether or not the amount of longitudinal deflection can be suppressed. Further, it is obvious that the turbulence generation protrusion is not a structure for preventing snow, which is a problem in the snow tire, from remaining in the groove.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5374362

Disclosure of Invention

The present invention addresses the problem of providing a pneumatic tire that not only has resistance to external damage and cooling performance, but also can improve traction performance by increasing the rigidity of auxiliary ribs, improve snow removal performance in lateral grooves, and suppress the amount of longitudinal deflection in the sidewall portion.

A pneumatic tire according to an aspect of the present invention includes: a plurality of shoulder pattern blocks provided on the side wall portion, partitioned by communication grooves extending in the tire circumferential direction and lateral grooves extending in the tire width direction, and juxtaposed in the tire circumferential direction;

an auxiliary rib provided to the sidewall portion, extending in the tire circumferential direction along the shoulder block; and

a protrusion provided to the sidewall portion, extending from the auxiliary rib into the lateral groove.

According to this configuration, the protrusions can protect the sidewall portion, improve the rigidity of the auxiliary rib, and improve the traction performance. The protrusions can cause air passing through the surface to be turbulent, thereby exhibiting cooling performance. In addition, the projections function to appropriately discharge snow that has intruded into the lateral grooves.

Preferably, the protrusions are formed of 1 st protrusions and 2 nd protrusions alternately arranged in the tire circumferential direction, and the 1 st protrusions and the 2 nd protrusions have different protruding dimensions into the lateral grooves.

Preferably, the projection gradually decreases in width as it approaches the front end.

Preferably, the protrusion has an inclined surface that is closer to the bottom surface of the lateral groove as the protrusion approaches the front end.

According to the present invention, since the protrusions extending from the auxiliary rib into the lateral grooves are formed, snow can be easily removed from the lateral grooves, and not only the resistance to external damage and the cooling performance are improved, but also the rigidity of the reinforcing rib is improved to exert the traction performance.

Drawings

Fig. 1 is a perspective view showing a part of a pneumatic tire according to the present embodiment.

Fig. 2 is a partially developed view of the pneumatic tire shown in fig. 1.

Fig. 3A is a partially enlarged view of fig. 2.

FIG. 3B is a longitudinal sectional view of the 1 st projection of FIG. 3A

FIG. 3C is a longitudinal cross-sectional view of the 2 nd protrusion of FIG. 3A

Detailed Description

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. The following description is merely an example in nature, and the present invention is not intended to limit the application or uses thereof. In addition, the drawings are schematic, and the ratio of the respective dimensions and the like are different from those in reality.

Fig. 1 is a perspective view showing a part of a pneumatic tire according to the present embodiment. Although not shown, the pneumatic tire is configured such that: a carcass is laid between a pair of bead cores, a belt is wound around an outer periphery of an intermediate portion of the carcass to reinforce the carcass, and a tread portion 1 is disposed on an outer diameter side of the tire. In fig. 1, the sipe 9 formed in the land portion 3 of the tread portion 1 is omitted.

Fig. 2 is a partially developed view showing a tread pattern of the pneumatic tire shown in fig. 1. The tread pattern is composed of a tread portion 1 in contact with a road surface and side wall portions 2 on both sides thereof. The centers in the tire width direction (indicated by arrow W in fig. 2) of the land portions 3 constituting the tread pattern are connected in the tire circumferential direction (indicated by arrow R in fig. 2), and extend from there to both sides in the tire width direction at predetermined intervals in the tire circumferential direction.

A portion of the land portion 3 that is connected in the tire circumferential direction at the center in the tire width direction is a center rib 4. In addition, the portions of the land portion 3 extending in the tire width direction are the center block portion 5 and the shoulder blocks 6.

The center block portion 5 and the shoulder blocks 6 are formed at predetermined intervals in the tire circumferential direction, and are configured by lateral grooves 7 that are inclined in the tire circumferential direction toward the outside in the tire width direction, and communication grooves 8 that communicate the lateral grooves adjacent in the tire circumferential direction with each other.

The lateral groove 7 is composed of a 1 st lateral groove 7a and a 2 nd lateral groove 7b wider than the 1 st lateral groove. The 1 st horizontal groove 7a and the 2 nd horizontal groove 7b are alternately arranged in the tire circumferential direction. Further, on both sides of a center line O (tire center line) in the tire width direction, the formation positions of the lateral grooves 7 are shifted in the tire width direction and the tire circumferential direction.

The communication groove 8 is constituted by a 1 st communication groove 8a formed on the tire centerline side and a 2 nd communication groove 8b formed on the tire width direction outer side. The 1 st communication groove 8a and the 2 nd communication groove 8b are alternately formed in the tire circumferential direction. Separated by the 1 st communication groove 8a is the 1 st center block portion 5a and the 1 st shoulder block 6 a. Also, separated by the 2 nd communicating groove 8b are a 2 nd center block portion 5b longer than the 1 st center block portion 5a, and a 2 nd shoulder block 6b shorter than the 1 st shoulder block 6 a.

A plurality of sipes 9 are formed at predetermined intervals so as to intersect the center rib 4 and the center block portion 5 in the extending direction. Each sipe 9 is composed of a linear portion 9a communicating with the lateral grooves 7 on both sides, and a wavy portion 9b communicating the linear portions with each other.

In the

shoulder blocks

6, 3 rows of sipes 9 are formed in the extending direction. One linear portion of each sipe 9 communicates with the communication groove 8, and an end portion of the other linear portion is located at a boundary portion between the tread portion 1 and the sidewall portion 2.

An auxiliary rib 10 is formed on the tire circumferential edge portion and connected annularly in the tire circumferential direction. And protrusions 11 extending from the auxiliary ribs 10 toward the respective lateral grooves 7 are formed, respectively. The projection 11 is composed of a 1 st projection 11a extending into the 1 st lateral groove and a 2 nd projection 11b extending into the 2 nd lateral groove.

As shown in fig. 3A and 3B, a projection dimension L1 (a length in the tire outer diameter direction from the inner peripheral edge of the auxiliary rib 10) of the 1 st projection 11a into the 1 st lateral groove 7a is suppressed. Specifically, the protrusion L1 is 5 to 50mm (20 mm in this case). The height H (height from the surface of the sidewall 2) of the 1 st projection 11a is 0.5 to 10mm (here, 1.2mm) as the height of the auxiliary rib 10. The tip of the 1 st projection 11a is formed with an inclined surface 11c gradually approaching the bottom surface of the lateral groove 7. The angle alpha formed by the inclined surface 11c and the upper surface 11d is 10 to 80 DEG (here, 35 deg). The width of the 1 st projection 11a gradually decreases as it approaches the tip, and the angle θ 1 between the two side surfaces is 3 to 30 ° (here, 14 °). The angle θ 1 is set to: the angle θ 2 is larger than the angle formed by the side wall portion 2 on both side surfaces of the 1 st lateral groove 7 a. The inclined surface 11c is formed over a length L2 from the tip of the 1 st projection 11 a. The length L2 is 3-50 mm (7.5 mm in this case). Further, the width w1 of the front end portion of the 1 st projection 11a is 1 to 20mm (1.8 mm in this case), and the width w2 of the 1 st lateral groove 7a at this position is 3 to 30mm (9.9 mm in this case). Further, the center line C1 of the 1 st projection 11a substantially coincides with the center line C2 of the 1 st lateral groove 7 a.

As shown in fig. 3A and 3C, the 2 nd protrusion 11b has a larger projection dimension L3 from the auxiliary rib 10 than the 1 st protrusion, and extends up to the vicinity of the boundary position between the tread portion 1 and the sidewall portion 2. Specifically, the protrusion L3 is 10 to 70mm (26 mm in this case). The height H of the 2 nd projection 11b is the same as the 1 st projection 11 a. In addition, a tip end portion of the 2 nd projection 11b is formed with an inclined surface 11e similar to the 1 st projection 11 a. The angle beta formed by the inclined surface 11e and the upper surface 11f is 10 to 80 DEG (40 DEG in this case). The width of the 2 nd projection 11b gradually becomes narrower as it approaches the tip, and the angle θ 3 formed between the both side surfaces is 3 to 30 ° (here, 9 °). The angle θ 3 is set to: the angle θ 4 formed at the sidewall 2 is larger than that of both side surfaces of the 2 nd lateral groove 7 b. The inclined surface 11e is formed over a length L4 from the tip of the 2 nd projection 11 b. The length L4 is 5-60 mm (here 13 mm). Further, the width dimension w3 of the front end portion of the 2 nd projection 11b is 1 to 20mm (2.2 mm in this case), and the width dimension w4 of the 2 nd lateral groove 7b at this position is 3 to 30mm (10.2 mm in this case). Further, the centerline C3 of the 2 nd projection 11b substantially coincides with the centerline C4 of the 2 nd lateral groove 7 b.

In this way, by alternately arranging the 1 st and 2

nd protrusions

11a, 11b having different projection dimensions in the tire circumferential direction, the rigidity at the sidewall portion 2 where the 1 st and 2

nd shoulder blocks

6a, 6b having different lengths are formed can be appropriately balanced. Further, although the block rigidity is different due to the difference in length between the

shoulder blocks

6a and 6b, so-called toe (toe) wear is likely to occur during traveling, the 1 st projection 11a and the 2 nd projection 11b can increase the rigidity of the 1 st shoulder block 6a and the 2 nd shoulder block 6b to be hard to deform, and the occurrence of toe wear can be suppressed. In particular, in the case of a winter tire, the shoulder blocks 6 are also formed with a large number of sipes 9 to easily cause a reduction in rigidity, but since the projections 11 suppress the reduction in rigidity, a desired cornering (cornering) performance can be obtained.

Further, since each projection 11 gradually narrows in width as it approaches the tip end and forms the inclined surface 11c at the tip end portion, even if snow remains in the lateral groove 7, the deformation of the sidewall portion 2 when the tread portion 1 comes into contact with the ground can cause the projection 11 to enter the bottom side of the snow in the lateral groove 7 and smoothly discharge the snow.

A convex portion 12 is formed at the outer end of each shoulder block 6 in the tire width direction. The convex portions 12 are composed of 1 st convex portion 12a in a zigzag shape and 2 nd convex portions 12b in a parallelogram shape formed along each tooth portion.

According to the pneumatic tire having the projection 11 configured as described above, the following effects can be obtained.

(1) The protrusions 11 inhibit foreign matter such as shoulder stones from coming into contact with the sidewall 2, and therefore can exhibit excellent resistance to external damage.

(2) Since the protrusions 11 can make wind generated during traveling turbulent, heat dissipation can be improved to exhibit excellent cooling performance.

(3) The protrusions 11 enhance the rigidity of the auxiliary rib 10 and reinforce it, and therefore, they can exhibit excellent traction performance.

(4) Since the projections 11 enter the lateral grooves 7, they function to discharge snow in the lateral grooves 7. That is, when the tread portion 1 is deformed by being contacted with the ground, the snow entering the lateral grooves 7 is discharged while climbing the inclined surface of the protrusion 11. This prevents snow from remaining in the lateral grooves 7, and a good running state can be obtained.

(5) Since the protrusions 11 can increase the rigidity of the shoulder blocks 6, the occurrence of toe wear can be suppressed, and desired cornering performance can be obtained.

[ description of reference ]

1 … tread part

2 … side wall part

3 … land part

4 … center rib

5 … center block portion

5a … 1 st center block portion

5b … center block 2

6 … shoulder block

6a … shoulder block 1

6b … shoulder Pattern 2

7 … horizontal groove

7a … 1 st lateral groove

7b … 2 nd transverse groove

8 … communication groove

8a … communication groove 1

8b … 2 nd communication groove

9 … sipe

10 … auxiliary rib

11 … protrusions

11a … item 1 projection

11b … No. 2 projection

11c … inclined plane

12 … convex part

12a … projection 1

12b … 2 nd projection

Claims

1. A pneumatic tire, characterized by comprising:

a plurality of shoulder pattern blocks provided on the side wall portion, partitioned by a communication groove extending in the tire circumferential direction and a lateral groove extending in the tire width direction, and juxtaposed in the tire circumferential direction;

a rib provided on the side wall portion, located on an inner side in a tire radial direction with respect to the plurality of shoulder blocks, and extending in a tire circumferential direction along the shoulder blocks; and

a protrusion provided on the side wall portion, extending outward in the tire radial direction from the rib, and having a leading end located in the lateral groove,

the protrusions are composed of 1 st protrusions and 2 nd protrusions alternately arranged in the tire circumferential direction, and the 1 st protrusions and the 2 nd protrusions have different protruding dimensions into the lateral grooves.

2. A pneumatic tire as in claim 1, wherein:

the width of the protrusion in the tire circumferential direction is smaller than the width between 2 shoulder blocks adjacent to each other.

3. A pneumatic tire as in claim 1, wherein:

the width of the lateral groove in the tire circumferential direction is larger than the width of the protrusion in the tire circumferential direction.

4. A pneumatic tire as in claim 1, wherein:

a sipe is formed in at least one of the shoulder blocks.

5. A pneumatic tire as in claim 2, wherein:

the lateral groove includes:

a 1 st lateral groove in which the leading end of the 1 st projection is located, having a 1 st width in the tire circumferential direction, an

A 2 nd lateral groove in which the leading end of the 2 nd protrusion is located, the 2 nd lateral groove having a 2 nd width different from the 1 st width in the tire circumferential direction.

6. A pneumatic tire as in claim 1, wherein:

the shoulder blocks have sidewalls extending in the tire radial direction,

the protrusions have side walls that are opposed to the side walls of the shoulder blocks, respectively, and extend in the tire radial direction,

at least one of the side walls of the protrusion and at least one of the side walls of the shoulder block are not parallel when viewed from the tire width direction.

7. A pneumatic tire as in claim 6, wherein:

the front end of the protrusion is tapered when viewed from the tire width direction,

the leading end of the protrusion is tapered when viewed from the tire width direction.

8. A pneumatic tire as in claim 1, wherein:

the width of the protrusion narrows toward the front end of the protrusion.

9. A pneumatic tire according to any one of claims 1 to 8, wherein:

the protrusion includes an inclined surface gradually approaching the bottom surface of the lateral groove toward the front end.