WO2013015375A1

WO2013015375A1 - Tire

Info

Publication number: WO2013015375A1
Application number: PCT/JP2012/069007
Authority: WO
Inventors: 吾空武居
Original assignee: 株式会社ブリヂストン
Priority date: 2011-07-26
Filing date: 2012-07-26
Publication date: 2013-01-31
Also published as: JPWO2013015375A1

Abstract

In this tire, inclined grove portions (100) comprise: wide sections (100w) that include the central line of the tire, extend from the central portion in the tread width direction towards the outside in the tread width direction, and have a first groove width; and narrow sections (100n) that have a second groove width narrower than the first groove width. The wide sections (100w) and the narrow sections (100n) repeat alternately from the central portion to the outside in the tread width direction.

Description

tire

The present invention relates to a tire in which a plurality of inclined grooves inclined with respect to the tire circumferential direction are formed in the tire circumferential direction, and a sipe extending in the tread width direction is formed in a block-shaped land portion provided between the inclined grooves.

Conventionally, various tread patterns are used in pneumatic tires (hereinafter referred to as tires) mounted on passenger cars and the like in order to improve performance on icy and snowy roads. For example, by forming a plurality of inclined grooves inclined with respect to the tire circumferential direction in the tread central part in the tread width direction and lug grooves extending in the tread width direction between adjacent inclined grooves, the tire is formed in the tread central part. A tire provided with a zigzag land portion extending in the circumferential direction is known. Further, a zigzag sipe extending in the tread width direction is formed in the land portion (see Patent Document 1).

However, in recent years, with the improvement in performance of passenger cars, there has been a demand for tires that achieve higher performance on wet and icy roads.

JP-A-8-216623

In the tire according to the first feature, a plurality of inclined grooves inclined in the tire circumferential direction are formed in the tire circumferential direction, and a sipe extending in the tread width direction is formed in the block-shaped land portion provided between the inclined grooves. The The inclined groove extends from the center in the tread width direction including the tire equator line toward the outside in the tread width direction. The inclined groove includes a wide portion having a first groove width and a narrow portion having a second groove width narrower than the first groove width. The wide portion and the narrow portion are alternately repeated from the central portion toward the outside in the tread width direction.

FIG. 1 is a partial plan development view of a tread of a pneumatic tire 10 according to the first embodiment. FIG. 2 is a partially enlarged plan view of the tread of the pneumatic tire 10 according to the first embodiment. FIG. 3 is a partial plan development view of the tread of the pneumatic tire 10A according to the second embodiment. FIG. 4 is a partial plan view of the tread of the pneumatic tire 10B according to the third embodiment.

Next, the tire (pneumatic tire) according to the embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

Therefore, specific dimensions should be determined in consideration of the following explanation. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

[First Embodiment]
(1) Schematic Configuration of Pneumatic Tire FIG. 1 is a partial plan development view of a tread of the pneumatic tire 10 according to the first embodiment. As shown in FIG. 1, a linear circumferential groove 20 and a circumferential groove 30 extending in the tire circumferential direction are formed in the pneumatic tire 10.

The pneumatic tire 10 is a so-called winter tire that can withstand use during snowfall, and has a tread pattern in which a rotation direction is specified when mounted on an automobile. The winter tire here refers to a tire including a studless tire that places importance on performance on icy and snowy roads, and an all-season tire that ensures a balanced performance on icy and non-icey roads. The pneumatic tire 10 may be filled with an inert gas such as nitrogen gas instead of air. Moreover, in FIG. 1, the thin line part means the area | region which does not touch a road surface at the time of a regular internal pressure and a regular load.

In addition, a plurality of block land portions 40 are provided between the circumferential groove 20 and the circumferential groove 30. That is, the block-like land portion 40 is provided in a region including the tire equator line CL. The block land portion 40 is formed with a sipe 50 extending in the tread width direction D _T. The pneumatic tire 10 may be formed with a sipe (not shown). For example, the pneumatic tire 10 has a sipe extending in the tread width direction D _T, it may be formed with sipes extending in the tire circumferential direction D _C is. Also, the position of the tire equator line CL are linear sipes extending along the tire circumferential direction D _C (not shown) is formed.

Block-shaped land portion 40 is provided between the inclined grooves 100 inclined relative to the tire circumferential direction D _C. Inclined groove 100 is formed in plurality in the tire circumferential direction _{D C.} The inclined groove 100 is a zigzag groove extending from the central portion of the tread width direction _DT , specifically, from the tire equator line CL toward the tread width direction _DT . The central portion of the tread width direction _DT refers to the tire equator line CL in a state where a normal load is applied to the pneumatic tire 10 set to a normal internal pressure defined by the Japan Automobile Tire Association (JATMA) or the like. It means in the region of 60% of the tread width.

(2) Shape of Land Part FIG. 2 is a partially enlarged plan view of the tread of the pneumatic tire 10. As shown in FIG. 2, the inclined groove 100 includes a wide portion 100w and a narrow portion 100n. Specifically, the wide portions 100w and the narrow portions 100n are alternately repeated.

The wide portion 100w extends from the center of the tread width direction _DT including the tire equator line CL toward the outside of the tread width direction _DT and has a first groove width. The narrow portion 100n is a portion having a second groove width that is narrower than the first groove width. The wide portion 100w and a narrow portion 100n, are alternately repeated toward the tread widthwise direction _{D T} outside the tread width direction _{D T.}

In the embodiment, the groove width may be the width of the inclined groove 100 in a direction orthogonal to the extension line L1 of the inclined groove 100 along the direction in which the inclined groove 100 extends. Alternatively, the groove width may be the width of the inclined groove 100 in a direction orthogonal to the extension line L2 along the direction in which the inclined groove 100 extends.

The inclined grooves 100 are respectively formed in one region and the other region in the tread width direction _{DT with} respect to the tire equator line CL. The inclined groove 100 has a substantially symmetric (line symmetric) shape in the one region and the other region.

In the inclined groove 100, the inclined groove 100 formed in the one region and the block-shaped land portion 40 provided in the other region face each other in the center portion of the tread width direction _DT including the tire equator line CL. . Conversely, the inclined groove 100 formed in the other region and the block-shaped land portion 40 provided in the one region face each other. That is, in the said one region and the other in the region, the arrangement position of the block-shaped land portion 40 and the inclined groove 100 is displaced in the tire circumferential direction D _C. Thus, by the arrangement position of the inclined groove 100 (phase) are shifted in the tire circumferential direction D _C, it is possible to reduce the pattern noise. Also, by groove wall 100α extending along the tread width direction D _T is formed, and functions groove wall 100α as edges in the tire circumferential direction D _C, traction performance is improved.

Further, the end of the inclined groove 100 outside the tread width direction _DT communicates with the circumferential groove 20 (circumferential groove 30). The inclined groove 100 extends to the circumferential groove 20 (circumferential groove 30) without intersecting with other than the sipe 50. In other words, since there are no intersecting grooves in the center region, water can be smoothly discharged toward the outside of the tread width direction _DT , and drainage performance is improved.

The inclined groove 100 includes a rectangular first groove portion 110 and a second groove portion 120. The second groove portion 120 communicates with the first groove portion 110 on the outer side in the tread width direction _DT than the first groove portion 110. In the present embodiment, the first groove part 110 and the second groove part 120 have a parallelogram shape. The second groove part 120 forms a narrow part 100n by shifting to the outer side in the tread width direction _DT from the first groove part 110. The inclined groove 100 extends to the outer side in the tread width direction D _T by repeating rectangular groove portions such as the first groove portion 110 and the second groove portion 120.

Incidentally, as in this embodiment, (relative to the straight line passing through the groove center of the inclined groove 100) acute side when the angle is less than 60 ° formed with the tire circumferential direction D _C and the inclined groove 100, second groove 120 It is preferable to form the narrow portion 100n by shifting to the outer side in the tread width direction than the first groove portion 110. By forming the narrow portion 100n, it is possible to keep snow in the inclined groove 100 while maintaining drainage, and the snow that remains in the inclined groove 100 improves the shearing force on the snow. This improves the traction performance on snow.

[Second Embodiment]
FIG. 3 is a partial plan development view of the tread of the pneumatic tire 10A according to the second embodiment. Hereinafter, a different part from the pneumatic tire 10 mentioned above is mainly demonstrated. Compared to the pneumatic tire 10, the shape of the inclined groove 100A is slightly different in the pneumatic tire 10A.

As shown in FIG. 3, the inclined groove 100A includes a first groove part 110A and a second groove part 120A. The second groove portion 120A communicates with the first groove portion 110A on the outer side in the tread width direction _DT than the first groove portion 110A. The inclined groove 100A extends to the outer side in the tread width direction _DT by repeating square groove portions such as the first groove portion 110A and the second groove portion 120A.

Acute angle side formed between the tire circumferential direction _{D C} and the inclined groove 100A is smaller than the inclined grooves 100 described above, similarly to the inclined groove 100, second groove 120A is the tread width direction than the first groove portion 110A It is preferable to form the narrow portion 100n by shifting outward.

Thus, by the arrangement position of the inclined groove 100A (phase) are shifted in the tire circumferential direction D _C, it is possible to reduce the pattern noise. Also, by groove wall 100α extending along the tread width direction D _T is formed, and functions groove wall 100α as edges in the tire circumferential direction D _C, traction performance is improved.

Similarly to the first embodiment, by forming the narrow portion 100n, it is possible to keep snow in the inclined groove 100 while maintaining the drainage, and the shear force on the snow by the snow remaining in the inclined groove 100 Will improve. This improves the traction performance on snow.

[Third Embodiment]
FIG. 4 is a partial plan view of the tread of the pneumatic tire 10B according to the third embodiment. Hereinafter, a different part from the pneumatic tire 10 mentioned above is mainly demonstrated. Compared to the pneumatic tire 10, the shape of the inclined groove 200 is different in the pneumatic tire 10B.

The inclined groove 200 includes a rectangular first groove portion 210 and a second groove portion 220. The second groove part 220 communicates with the first groove part 210 on the outer side in the tread width direction _DT than the first groove part 210. The inclined groove 200 extends to the outer side in the tread width direction D _T by repeating square groove portions such as the first groove portion 210 and the second groove portion 220. Such a shape is the same as the inclined groove 100 described above.

On the other hand, the second groove 220 in a direction inclined groove 200 extends, by deviating the tire circumferential direction _{D C} than the first groove 210 to form a narrow portion 200n. In the present embodiment, it is the tire circumferential direction D _C and the inclined grooves 200 and the acute side of the angle formed by 30 degrees or more, this case, the second groove 220 in a direction inclined groove 200 extends, the by deviating the tire circumferential direction _{D C} than first groove 210, it is preferable to form a narrow portion 200n.

Thus, by the arrangement position of the inclined groove 200 (phase) are shifted in the tire circumferential direction D _C, it is possible to reduce the pattern noise. Also, by groove wall 200α extending along the tire circumferential direction D _C is formed, the groove wall 200α as edges in the tread width direction D _T functions, steering stability in snow is improved.

Similarly to the first embodiment, by forming the narrow portion 200n, it is possible to keep snow in the inclined groove 200 while maintaining drainage, and the snow that remains in the inclined groove 200 causes a shearing force on the snow. Will improve. This improves the traction performance on snow.

[Action / Effect]
According to the

pneumatic tires

10, 10A, and 10B described above, the inclined groove (for example, the inclined groove 100) extends from the center portion of the tread width direction _DT including the tire equator line CL toward the outside of the tread width direction _DT. Exists. Moreover, the wide portion and the narrow portion of the inclined groove, are alternately repeated toward the center portion of the tread width direction D _T in the tread width direction D _T outside.

For this reason, since the snow which entered into the inclined groove is restricted from escape, the snow column shear force increases as a result. Therefore, the traction and braking force on an icy and snowy road are improved. Further, for example, the inclined groove 100 extends toward the outer side of the tread width direction _DT and communicates with the

circumferential grooves

20 and 30, so that rainwater that has entered the inclined groove 100 can be efficiently drained.

That is, according to the

pneumatic tires

10, 10A, 10B, the performance on wet roads and icy and snowy roads can be achieved at a high level.

Further, for example, in the first embodiment, in the one region and the other in the region relative to the tire equator line CL, the arrangement position of the block-shaped land portion 40 and the inclined groove 100 is displaced in the tire circumferential direction D _C . For this reason, since the entering snow is further restricted in the escape place, it can contribute to further improvement of the traction and braking force on the icy and snowy road.

Further, for example, in the first embodiment, the second groove portion 120 forms a narrow portion 100n by shifting to the outer side in the tread width direction _DT than the first groove portion 110. Furthermore, in the third embodiment, the second groove 220 in a direction inclined groove 200 extends, by deviating the tire circumferential direction _{D C} than the first groove 210 to form a narrow portion 200n.

For this reason, an increase in the edge component of the inclined groove can contribute to improvement of traction and braking force on an icy and snowy road, and handling performance.

[Other Embodiments]
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

For example, in the first embodiment described above, the first groove portion 110 and the second groove portion 120 have a quadrangular shape. However, the first groove portion 110 and the second groove portion 120 are not limited to a quadrangular shape, for example, an elliptical shape. But you can.

In the first embodiment, in the one region and the other in the region relative to the tire equator line CL, but the arrangement position of the block-shaped land portion 40 and the inclined groove 100 is deviated in the tire circumferential direction D _C, such Do arrangement is not necessarily essential, the arrangement position of the block-shaped land portion 40 and the inclined groove 100 may be coincident in the tire circumferential direction D _C.

In the embodiment described above, the central portion in the tread width direction _DT is a tread including the tire equator line CL in a state where a normal load is applied to the pneumatic tire 10 set to a normal internal pressure defined by JATMA or the like. In the case of a pneumatic tire that is assumed to be mounted on a car with a large camber angle, a normal load is applied to the pneumatic tire set to the normal internal pressure. It may also mean a region of 60% of the “contact width” of the tread with respect to the center in the tread width direction.

Thus, it goes without saying that the present invention includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is determined only by the invention specifying matters according to the scope of claims reasonable from the above description.

Note that the entire contents of Japanese Patent Application No. 2011-163360 (filed on July 26, 2011) are incorporated herein by reference.

According to the characteristics of the present invention, it is possible to provide a tire that can achieve higher performance on wet roads and icy and snowy roads.

Claims

A tire in which a plurality of inclined grooves inclined with respect to the tire circumferential direction are formed in the tire circumferential direction, and a sipe extending in the tread width direction is formed in the block-shaped land portion provided between the inclined grooves,
The inclined groove is
Extending from the center of the tread width direction including the tire equator line toward the outside of the tread width direction,
A wide portion having a first groove width and a narrow portion having a second groove width narrower than the first groove width;
The tire in which the wide portion and the narrow portion are alternately repeated from the central portion toward the outside in the tread width direction.
The inclined groove is formed in one region and the other region in the tread width direction with respect to the tire equator line,
In the central portion including the tire equator line, the inclined groove formed in the one region and the block land portion provided in the other region face each other, and the formed in the other region. The tire according to claim 1, wherein the inclined groove and the block land portion provided in the one region face each other.
A linear circumferential groove extending in the tire circumferential direction is formed,
The tire according to claim 1 or 2, wherein an end of the inclined groove on the outer side in the tread width direction communicates with the circumferential groove.
The inclined groove is
A rectangular first groove,
A quadrangular second groove portion communicating with the first groove portion on the outer side in the tread width direction than the first groove portion;
The tire according to any one of claims 1 to 3, wherein the second groove portion forms the narrow portion by being displaced outward in the tread width direction from the first groove portion.
The inclined groove is
A rectangular first groove,
A quadrangular second groove portion communicating with the first groove portion on the outer side in the tread width direction than the first groove portion;
The said 2nd groove part forms the said narrow part by shifting | deviating to a tire circumferential direction rather than the said 1st groove part in the direction where the said inclination groove | channel extends, The Claim 1 thru | or 3 characterized by the above-mentioned. tire.
When the angle on the acute angle side formed by the tire circumferential direction and the inclined groove is less than 60 degrees, the second groove portion is displaced outward in the tread width direction from the first groove portion, thereby forming the narrow portion. Item 5. The tire according to Item 4.
When the acute angle formed by the tire circumferential direction and the inclined groove is 30 degrees or more, the second groove portion is displaced in the tire circumferential direction from the first groove portion in the direction in which the inclined groove extends. The tire according to claim 5, wherein the narrow portion is formed.