CN108790616B - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
CN108790616B
CN108790616B CN201810281238.4A CN201810281238A CN108790616B CN 108790616 B CN108790616 B CN 108790616B CN 201810281238 A CN201810281238 A CN 201810281238A CN 108790616 B CN108790616 B CN 108790616B
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China
Prior art keywords
tire
sipe
circumferential
sipes
intersecting
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CN108790616A (en
Inventor
镰田信行
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Publication of CN108790616A publication Critical patent/CN108790616A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0304—Asymmetric patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/032—Patterns comprising isolated recesses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

The invention provides a pneumatic tire, which can realize the uniformity of the grounding performance of a land part divided by a plurality of main groove areas in the width direction of the tire and can inhibit the uneven wear degree in the circumferential direction of the tire from increasing. A pneumatic tire is provided with: main grooves (11, 12) extending in the tire circumferential direction; and a central land portion (20) divided by the main trench, the central land portion having: a circumferential sipe (23) extending in a direction inclined with respect to the tire circumferential direction; intersecting sipes (22) extending in a direction intersecting with respect to the circumferential sipes (23); a partition wall part (24) which is positioned between the circumferential sipes and the crossed sipes and separates the sipes from each other, and a sipe projection range (R) formed by projecting the circumferential sipes and the crossed sipes in the tire circumferential direction in the ground contact shape (GS)23、R22) Partially overlap each other in the tire width direction and traverse the entire range of the central land portion in the tire width direction.

Description

Pneumatic tire
Technical Field
The present invention relates to a pneumatic tire.
Background
For a pneumatic tire having a land portion (e.g., rib) demarcated by a plurality of main grooves extending in the tire circumferential direction, there are known: by forming a circumferential sipe extending in a direction inclined with respect to the tire circumferential direction in the land portion, a groove volume is increased to improve drainage.
However, in the case where the circumferential sipe is inclined with respect to the tire circumferential direction, the size of the land portions divided on both sides of the circumferential sipe in the tire width direction is not uniform, and therefore, a difference in rigidity is generated between these land portions, and therefore, the ground contact property of the land portions tends to become non-uniform in the tire width direction. In contrast, for example, patent document 1 discloses the following technique: intersecting sipes extending so as to intersect with the circumferential sipes inclined with respect to the tire circumferential direction are formed.
Patent document
Patent document 1: japanese patent laid-open publication No. 2014-162295
Disclosure of Invention
In the pneumatic tire of patent document 1, although the rigidity of the land portions in the tire width direction is substantially equalized by the intersecting sipes, the difference in rigidity between the land portions located on both sides in the tire circumferential direction across the intersecting portions is increased, and therefore, the degree of uneven wear in the tire circumferential direction is increased. Further, when the pneumatic tire is vulcanized and molded, the rubber flow on both sides in the tire circumferential direction across the intersecting portion is hindered by the intersecting sipes, and therefore, a defect of rubber shortage due to a rubber flow defect is likely to occur.
In contrast, when the intersecting sipes are formed at intervals with respect to the circumferential sipes, the land portions located on both sides in the tire circumferential direction across the intersecting portion are connected by the partition wall portion that partitions the intersecting sipes and the circumferential sipes in the tire width direction, and therefore, the difference in rigidity between these land portions is reduced.
However, in the case where a portion where no sipe is formed exists at a position where the partition wall portion is formed in the tire width direction as viewed in the tire circumferential direction, the rigidity of the partition wall portion is higher than the rigidity of the other portions, and therefore, the uniformity of the ground contact property in the tire width direction cannot be achieved.
The present invention addresses the problem of providing a pneumatic tire that can make the ground contact properties of land portions demarcated by a plurality of main groove regions uniform in the tire width direction, and that can suppress an increase in the degree of uneven wear in the tire circumferential direction.
The present invention provides a pneumatic tire, comprising: a plurality of main grooves extending in the tire circumferential direction; a plurality of land portions divided by the plurality of main grooves or the main grooves and a lateral groove extending in a tire width direction, the land portions having: a circumferential sipe extending in a direction inclined with respect to a tire circumferential direction; intersecting sipes extending in a direction intersecting with respect to the circumferential sipes; and a partition wall portion that is located between the circumferential sipe and the intersecting sipe and partitions the circumferential sipe and the intersecting sipe from each other, and in the ground contact shape, a sipe projection range formed by projecting the circumferential sipe in the tire circumferential direction and a sipe projection range formed by projecting the intersecting sipe in the tire circumferential direction partially overlap each other in the tire width direction and traverse the entire range of the land portion in the tire width direction.
According to the present invention, the circumferential sipes extend in a direction inclined with respect to the tire circumferential direction, and therefore, compared with a case where they extend in parallel with respect to the tire circumferential direction, the groove volume is increased, thereby improving drainage. Here, if a circumferential sipe inclined with respect to the tire circumferential direction is formed, the land portion is divided in the tire width direction by the circumferential sipe and the size becomes uneven, and therefore, a difference in rigidity tends to occur in the tire width direction.
However, according to the present invention, the sipe projection range of the circumferential sipe and/or the intersecting sipe is located on the land portion of the land shape across the entire range in the tire width direction, and therefore, the rigidity of the land portion can be uniformly reduced in the entire tire width direction. That is, by forming the circumferential sipes inclined with respect to the tire circumferential direction, it is possible to improve drainage and to make the ground contact performance of the land portion uniform in the tire width direction.
Further, since the circumferential sipes and the intersecting sipes are spaced apart from each other, rubber can flow between the sipes during vulcanization molding, and a problem of insufficient rubber due to a failure in rubber flow can be suppressed.
Preferably, the interval between the circumferential sipe and the intersecting sipe is 1/2 or more of the groove width of the circumferential sipe.
According to this configuration, by forming an appropriate space between the circumferential sipes and the intersecting sipes, the flow of rubber during vulcanization molding can be made easier, and a rubber flow failure can be suppressed. In addition, since the thickness of the rubber vulcanized and molded in the space can be ensured, the occurrence of chipping of the rubber can be suppressed when the tire vulcanization mold is released after vulcanization and molding.
Further, it is preferable that the inclination angle of the circumferential sipes with respect to the tire circumferential direction is 10 ° or less.
According to this configuration, the circumferential sipes are formed to be long, and therefore, the groove volume can be effectively increased, and the drainage effect by the circumferential sipes can be effectively exhibited.
Further, it is preferable that the inclination angle of the circumferential sipes with respect to the tire circumferential direction is 3 ° to 5 °.
According to this configuration, it is possible to effectively suppress an increase in the width-direction edge component formed by the circumferential sipes. That is, by effectively suppressing the increase of the width-direction edge component of the circumferential sipe, water is easily introduced into the circumferential sipe, and the drainage effect by the circumferential sipe is easily and effectively exhibited.
In addition, it is preferable that the intersecting sipes extend in a direction inclined at an angle of 25 ° or more with respect to the extending direction of the circumferential sipes.
According to the present structure, in the tire vulcanizing mold, it is possible to prevent the angle between the sipe blade for forming the circumferential sipe and the sipe blade for forming the intersecting sipe from becoming excessively small. This can prevent the vulcanized rubber from being sandwiched between the two sipe blades of the tire vulcanizing mold, and can more effectively prevent the rubber from being chipped when the tire vulcanizing mold is released from the mold.
Further, it is preferable that the partition wall portion has, at a side portion on the widthwise sipe side as viewed in the tire circumferential direction: a vertical surface portion extending from a surface of the land portion toward a tire radial direction inner side in a direction perpendicular to the surface; and an inclined portion that is inclined toward the tire radial direction inner side and toward the widthwise sipe side on the groove bottom side. More preferably, the inclined portion is inclined at an inclination of 5 ° or more and 45 ° or less with respect to a straight line passing from an intersection of the side portion of the partition wall portion and the surface and extending perpendicularly to the surface.
According to this structure, the rigidity of the front surface side of the partition wall portion can be easily reduced appropriately. Further, even when the wear progresses, the sipe length of the widthwise sipe is easily maintained, and the uniformity of the grounding property is easily maintained. Further, since the partition wall portion is formed to have a large width in the tire width direction by the inclined portion on the groove bottom side, the rigidity of the base end portion side can be improved, and the rigidity of the partition wall portion can be appropriately improved.
In addition, it is preferable that the intersecting sipes be constituted by a plurality of partial sipes formed intermittently. The intersecting sipes may be configured by a plurality of partial sipes formed at different positions in the tire width direction, or may be configured by a plurality of partial sipes formed at different positions in the tire circumferential direction.
Effects of the invention
According to the present invention, it is possible to make the ground contact performance of the land portion demarcated by the plurality of main groove regions uniform in the tire width direction, and to suppress an increase in the degree of uneven wear in the tire circumferential direction.
Drawings
Fig. 1 is a plan view showing a developed tread pattern of a pneumatic tire according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a sectional view at the line III-III in fig. 2.
Fig. 4A is an enlarged view similar to fig. 2 showing a width direction sipe according to a modification.
Fig. 4B is an enlarged view similar to fig. 2 showing a sipe in the width direction according to another modification.
Fig. 4C is an enlarged view similar to fig. 2 showing a width-direction sipe according to still another modification.
Description of the reference numerals
11. 12 central main groove
13. 14 outer main groove
20 central land part
22 widthwise sipes
23 circumferential sipes
24 partition wall part
30. 40 middle land part
50. 60 tire shoulder land portion
Width of the front side of the W-partition wall
C L tire equator
GS ground shape
G L ground terminal
Theta 1 inclination angle of circumferential sipe
Theta 2 intersection angle of the widthwise sipe with respect to the extending direction of the circumferential sipe
Detailed Description
Hereinafter, embodiments according to the present invention will be described with reference to the drawings. The following description is merely exemplary in nature and is not intended to limit the present invention, its application, or uses. The drawings are schematic, and the ratio of the dimensions and the like are different from those in reality.
Fig. 1 is a plan view showing a developed tread pattern of a tread portion 2 of a pneumatic tire 1 according to an embodiment of the present invention. For convenience of explanation, the direction toward the right side in the figure is referred to as "F" side, and the direction toward the left side in the figure is referred to as "R" side in the tire circumferential direction.
As shown in fig. 1, 4 main grooves 11 to 14 extending in the tire circumferential direction are formed in the tread portion 2, specifically, 2 central main grooves 11, 12 are formed in the substantially central portion in the tire width direction, 2 outer main grooves 13, 14 are formed on the outer sides in the tire width direction of the central main grooves, and the central main grooves 11, 12 are located on both sides across the tire equator line C L.
A center land portion 20 is defined between the center main grooves 11, 12. An intermediate land portion 30 is defined between the central main groove 11 and the outer main groove 13, and an intermediate land portion 40 is defined between the central main groove 12 and the outer main groove 14. Shoulder land portions 50, 60 are defined on the outer sides of the outer main grooves 13, 14 in the tire width direction.
That is, the tread portion 2 is configured to have a rib pattern of 5 land portions 20, 30, 40, 50, 60 extending in the tire circumferential direction by 4 main grooves 11 to 14 extending in the tire circumferential direction.
The center land portion 20 includes: a lateral groove 21 and a width direction sipe 22 (intersecting sipe) extending in the tire width direction; and a circumferential sipe 23 extending in the tire circumferential direction.
In the present specification, terms such as a circumferential sipe and a widthwise sipe are used in some cases, and these sipes mean a sipe formed by using a plate-shaped sipe blade in a tire vulcanizing mold. In other words, the sipe means a groove having a groove width of about 1.5mm or less, and in which the opposing groove wall surfaces are in contact with each other in a grounded state.
In fig. 1, the portion that abuts the road surface in the ground contact state is shown by a broken line as the ground contact shape GS, in the pneumatic tire 1 according to the present embodiment, the ground contact edge G L in the tire width direction is located on the outer side of the shoulder land portions 50, 60 in the tire width direction, and the portion located between the ground contact edges G L is in contact with the road surface in the ground contact state, that is, the entire range of the center land portion 20 and the intermediate land portions 30, 40 in the tire width direction is grounded, and the portion of the shoulder land portions 50, 60 that is located on the inner side of the ground contact edge G L in the tire width direction is grounded.
Hereinafter, the center land portion 20 will be described with reference to fig. 2.
As shown in fig. 2, the lateral grooves 21 are formed in plurality at intervals in the tire circumferential direction, extend obliquely from one end portion communicating with the central main groove 11 toward the central main groove 12 side and toward the tire circumferential direction F side, and terminate at the other end portion at a position exceeding the tire equator line C L in the central land portion 20.
The circumferential sipe 23 extends in the tire circumferential direction between a pair of lateral grooves 21, 21 located adjacent to each other in the tire circumferential direction, extends in a direction inclined toward the center main groove 11 side toward the R side in the tire circumferential direction from the other end portion of the lateral groove 21 located on the F side in the tire circumferential direction, and reaches the lateral groove 21 located on the R side in the tire circumferential direction. The inclination angle θ 1 of the circumferential sipes 23 with respect to the tire circumferential direction is set to 10 ° or less.
The widthwise sipe 22 is located substantially at the center in the tire circumferential direction between a pair of lateral grooves 21, 21 adjacent to each other in the tire circumferential direction, and extends obliquely from the center main groove 11 side toward the center main groove 12 side and toward the tire circumferential direction F side. The widthwise sipes 22 extend in a direction intersecting at an inclination angle θ 2 with respect to the circumferential sipes 23. The inclination angle θ 2 is set to 25 ° or more.
The widthwise sipes 22 are formed in a pair on both sides in the tire widthwise direction of the circumferential sipe 23, and include: a first widthwise sipe 22A located on the central main groove 11 side; and a second widthwise sipe 22B located on the central main groove 12 side.
The first widthwise sipes 22A extend from one end portion communicating with the central main groove 11 toward the central main groove 12 side, and the other end portion terminates in the central land portion 20 at a distance from the circumferential sipes 23. Similarly, the second widthwise sipes 22B extend from one end portion communicating with the central main groove 12 toward the central main groove 11, and the other end portion terminates in the central land portion 20 at a distance from the circumferential sipes 23.
In other words, partition wall portions 24, which are solid portions where no sipe is formed, are formed between the circumferential sipes 23 and the first and second widthwise sipes 22A and 22B, respectively.
Here, in the tire width direction, one end portion of the first width direction sipe 22A located on the circumferential sipe 23 side is located in a sipe projection range R formed by projecting the circumferential sipe 23 in the tire circumferential direction23The other end portion on the opposite side of the circumferential sipe 23 communicates with the central main groove 11. In addition, in the tire width direction, one end portion of the second width direction sipe 22B on the circumferential direction sipe 23 side is located in the sipe projection range R23The other end portion on the opposite side of the circumferential sipe 23 communicates with the central main groove 12.
That is, the sipe projection range R formed by projecting the first widthwise sipe 22A in the tire circumferential direction22AAnd a sipe projection range R of the circumferential sipe 2323Overlapping in the tire width direction within the range of X1. Similarly, the second widthwise sipes 22B are formed by projecting in the tire circumferential directionSipe projection range R22BAnd a sipe projection range R of the circumferential sipe 2323Overlapping in the tire width direction within the range of X2.
In other words, in the ground contact shape GS (see fig. 1), a sipe projection range R is formed by projecting the circumferential sipe 23 and the first width direction sipe 22A and the second width direction sipe 22B formed on both sides of the circumferential sipe 23 in the tire width direction in the tire circumferential direction23、R22AAnd R22BAnd partially overlap each other in the tire width direction and traverse the entire range of the center land portion 20 in the tire width direction.
Fig. 3 is a cross-sectional view taken along the line III-III in fig. 2, and is a view of the cross-section of the sipe 22 in the width direction of the center land portion 20 as viewed in the tire circumferential direction. As shown in fig. 3, as for the partition wall portion 24, an inner portion in the tire radial direction is formed to be larger in width than the surface side. The width W of the surface of the partition wall portion 24 in the tire width direction is set to be equal to or greater than 1/2 of the groove width W0 of the circumferential sipe 23. Further, the width W of the partition wall portion 24 may be set such that the other end portion of the widthwise sipe 22 (on the circumferential sipe 23 side in the tire widthwise direction) is located in the sipe projection range R of the circumferential sipe 2323Within the range of (1).
The partition wall portion 24 has, at a side portion on the width direction sipe 22 side, a vertical face portion 25 extending from the surface of the central land portion 20 toward the tire radial direction inner side in a direction perpendicular to the face. The surface of the central land portion 20 is orthogonal with respect to the tire radial direction, and therefore, the vertical face portion 25 extends parallel to the tire radial direction. The length H in the tire radial direction of the vertical surface portion 25 is set to be equal to or less than 1/2 of the groove depth H0 of the widthwise sipe 22.
In addition, the partition wall portion 24 has, at a side portion on the width direction sipe 22 side, an inclined portion 26 that is inclined toward the tire radial direction inner side and toward the width direction sipe side. The inclined portion 26 is formed further toward the tire radial inner diameter side than the face vertical portion 25. Preferably, the inclined portion 26 is formed at the end portion on the tire radial direction inner diameter side (the groove bottom side of the widthwise sipe 22), whereby, when wear occurs, the widthwise sipe 22 is suppressed from being reduced in the tire widthwise direction.
The inclination angle θ 3 of the inclined portion 26 is set to 45 ° or less with respect to a straight line L passing through and extending perpendicularly to the surface of the tread portion 2 from the intersection of the side portion of the partition wall portion 24 and the surface, whereby the widthwise sipe 22 is suppressed from decreasing in the tire widthwise direction when wear occurs, and further, preferably, the inclination angle θ 3 is set to 5 ° or more, whereby the base end portion of the partition wall portion 24 on the tire radial direction inner diameter side can be effectively formed to be large in width.
As shown by the two-dot chain line in fig. 3, the partition wall portion 24 may be configured such that: extending in the tire radial direction and having a constant width in the tire width direction.
According to the pneumatic tire 1 described above, the following effects can be achieved.
(1) The circumferential sipes 23 extend in a direction inclined with respect to the tire circumferential direction, and therefore, compared with a case where they extend in parallel with respect to the tire circumferential direction, the groove volume is increased, thereby improving drainage. Here, if the circumferential sipes 23 inclined with respect to the tire circumferential direction are formed, the central land portion 20 is divided in the tire width direction by the circumferential sipes 23 and made uneven in size, and therefore, a difference in rigidity tends to occur in the tire width direction.
However, the sipe projection range R of the circumferential sipe 23 and/or the width direction sipe 2223、R22Since the center land portion 20 of the land shape GS is located across the entire range in the tire width direction, the rigidity of the center land portion 20 can be uniformly reduced in the entire tire width direction. That is, by forming the circumferential sipes 23 inclined with respect to the tire circumferential direction, it is possible to improve drainage and to make the ground contact performance of the center land portion 20 uniform in the tire width direction.
(2) Since the partition wall portion 24 is provided between the circumferential sipes 23 and the lateral sipes 22, rubber can flow between these sipes during vulcanization molding, and a defect of insufficient rubber due to a defect in rubber flow can be suppressed.
(3) Since the width W of the partition wall portion 24 is set to be equal to or greater than 1/2 of the groove width W0 of the circumferential sipe 23, the flow of rubber during vulcanization molding can be facilitated, and a rubber flow defect can be suppressed. Further, since the thickness of the rubber vulcanized and molded into the partition wall portion 24 can be ensured, chipping (chipping) of the rubber can be suppressed when the tire vulcanization mold after vulcanization and molding is released.
(4) Since the inclination angle θ 1 of the circumferential sipe 23 with respect to the tire circumferential direction is set to 10 ° or less, the circumferential sipe 23 is configured to be long, and as a result, the groove volume can be effectively increased, and the drainage effect by the circumferential sipe 23 can be effectively exhibited.
(5) The widthwise sipes 22 extend in a direction inclined at an inclination angle θ 2 of 25 ° or more with respect to the extending direction of the circumferential sipes 23, and therefore, in the tire vulcanizing mold, it is possible to prevent the angle between the sipe blade for forming the circumferential sipes 23 and the sipe blade for forming the widthwise sipes 22 from becoming excessively small. This can prevent the vulcanized rubber from being sandwiched between the two sipe blades of the tire vulcanizing mold, and therefore, the breakage of the rubber can be more effectively suppressed at the time of releasing the tire vulcanizing mold.
(6) The partition wall portion 24 is formed with a vertical surface portion 25 on the front surface side and an inclined portion 26 on the groove bottom side, i.e., is formed with a larger width on the groove bottom side. This makes it easy to appropriately reduce the rigidity of the front surface side of the partition wall 24. Further, even when the wear progresses, the sipe length of the widthwise sipe 22 is easily maintained, and the uniformity of the grounding property is easily maintained. Further, since the partition wall portion 24 is formed to have a large width in the tire width direction by the inclined portion 26 on the groove bottom side, the rigidity on the base end portion side is high, and the rigidity of the partition wall portion 24 can be appropriately increased.
In the above embodiment, the widthwise sipe 22 is configured to continuously extend as follows: one end of whichSipe projection range R located in the circumferential sipe 2323The other end portion communicates with the end portions (central main grooves 11 and 12) of the central land portion 20, but is not limited thereto. That is, the width direction sipe 22 may be configured by a plurality of partial width direction sipes 220.
For example, as shown in fig. 4A, the first widthwise sipe 22A may be constituted by 3 partial widthwise sipes 221A to 223A formed at different positions in the tire widthwise direction, and the second widthwise sipe 22B may be constituted by 2 partial widthwise sipes 221B, 222B formed at different positions in the tire widthwise direction.
In this case, a sipe projection range R formed by projecting the partial widthwise sipe 221A in the tire circumferential direction221AA sipe projection range R on the side of the circumferential sipe 23 with respect to the circumferential sipe 2323The ranges Z1 partially overlap in the tire width direction. In addition, the projection range R of the sipe221AA sipe projection range R of the sipe 222A in the partial width direction on the opposite side of the circumferential sipe 23222AThe ranges Z2 partially overlap in the tire width direction. Similarly, the sipe projection range R of the partial width direction sipe 222A and the partial width direction sipe 223A222AAnd R223AEach of the ranges Z3 partially overlaps in the tire width direction. Further, the partial widthwise sipe 223A communicates with the central main groove 11.
The same applies to the other side of the circumferential sipe 23, and the sipe projection range R of the partial widthwise sipe 221B221BA sipe projection range R relative to the tire circumferential direction sipe 23 on the circumferential direction sipe 23 side23The ranges Z4 partially overlap in the tire width direction. In addition, the projection range R of the sipe221BA sipe projection range R of the sipe 222B with respect to the partial width direction on the opposite side of the circumferential sipe 23222BThe ranges Z5 partially overlap in the tire width direction. In addition, the partial width direction sipe 222B is continuous with the central main groove 12The method is simple.
That is, even when the widthwise sipe 22 is formed by the plurality of partial widthwise sipes 220 formed at different positions in the tire widthwise direction, it is sufficient to configure as follows: sipe projection range R of each of the plurality of partial sipes 220 in the width direction220And a sipe projection range R of the circumferential sipe 2323Partially overlap each other in the tire width direction and traverse the entire range of the central land portion 20 in the tire width direction.
Similarly, as shown in fig. 4B, the first widthwise sipe 22A may be formed by a plurality of partial widthwise sipes 321A and 322A formed at different positions in the tire circumferential direction, and the second widthwise sipe 22B may be formed by a plurality of partial widthwise sipes 321B and 322B. Specifically, the partial width direction sipe 321A located on the R side in the tire circumferential direction in the first width direction sipe 22A may be configured as: sipe projection range R with circumferential sipe R2323Partially overlapping, the partial width direction sipe 322B located on the F side in the tire circumferential direction in the second width direction sipe 22B may be configured as: sipe projection range R with circumferential sipe R2323Partially overlapping.
Even in this case, the following configuration may be adopted: each sipe projection range R321A、R321B、R322AAnd R322BSipe projection range R together with circumferential sipe 2323The ranges V1 to V4 partially overlap in the tire width direction and traverse the entire range of the center land portion 20 in the tire width direction.
As shown in fig. 4C, the first widthwise sipe 22A may be formed of a plurality of partial widthwise sipes 421A and 422A formed at different positions in the tire circumferential direction, and the second widthwise sipe 22B may be formed of a plurality of partial widthwise sipes 421B and 422B. Specifically, the partial width direction on the F side in the tire circumferential direction in the first width direction sipe 22AThe sipe R422A may be configured to have a sipe projection range R with respect to the circumferential sipe R2323The partial overlap, the partial width direction sipe 421B located on the R side in the tire circumferential direction in the second width direction sipe 22B may be configured to overlap with the sipe projection portion R of the circumferential sipe R2323Partially overlapping.
Even in this case, the following configuration may be adopted: each sipe projection range R421A、R421B、R422AAnd R422BSipe projection range R together with circumferential sipe 2323Ranges W1 to W4 partially overlap in the tire width direction and traverse the entire range of the center land portion 20 in the tire width direction.
In the above embodiment, the inclination angle θ 1 of the circumferential sipe 23 with respect to the tire circumferential direction is set to 10 ° or less, but more preferably, the inclination angle θ 1 is set to 3 ° or more and 5 ° or less. This can effectively suppress an increase in the width-direction edge component due to the circumferential sipes 23. That is, by effectively suppressing the increase of the width-direction edge component of the circumferential sipes 23, water is more easily introduced into the circumferential sipes 23, and the drainage effect by the circumferential sipes 23 is more easily exhibited.
In the above embodiment, the widthwise sipe 22 extending in the tire widthwise direction was described as an example of the sipe intersecting the circumferential sipe 23, but the invention is not limited thereto. That is, the sipe may extend in a direction intersecting the circumferential sipe 23 at an intersection angle θ 2 of 25 ° or more, but the sipe is not limited to extend substantially in the tire width direction and may extend substantially in the tire circumferential direction.

Claims (10)

1. A pneumatic tire is provided with: a plurality of main grooves extending in the tire circumferential direction; a plurality of land portions divided by the plurality of main grooves or by the main grooves and lateral grooves extending in the tire width direction, wherein,
the land portion has:
a circumferential sipe extending in a direction inclined with respect to a tire circumferential direction;
intersecting sipes extending in a direction intersecting with respect to the circumferential sipes; and
a partition wall portion located between the circumferential sipe and the intersecting sipe and partitioning the circumferential sipe and the intersecting sipe from each other,
in the ground contact shape, a sipe projection range formed by projecting the circumferential sipe in the tire circumferential direction and a sipe projection range formed by projecting the intersecting sipe in the tire circumferential direction partially overlap each other in the tire width direction and traverse the entire range of the land portion in the tire width direction.
2. The pneumatic tire of claim 1,
the interval between the circumferential sipes and the intersecting sipes is greater than or equal to 1/2, which is the groove width of the circumferential sipes.
3. The pneumatic tire according to claim 1 or 2,
the inclination angle of the circumferential sipes with respect to the tire circumferential direction is 10 DEG or less.
4. The pneumatic tire according to claim 1 or 2,
the inclination angle of the circumferential sipes with respect to the tire circumferential direction is 3 ° to 5 °.
5. The pneumatic tire according to claim 1 or 2,
the intersecting sipes extend in a direction inclined at an angle of 25 ° or more with respect to the direction in which the circumferential sipes extend.
6. The pneumatic tire according to claim 1 or 2,
the side portion of the partition wall portion on the widthwise sipe side as viewed in the tire circumferential direction has:
a vertical surface portion extending from a surface of the land portion toward a tire radial direction inner side in a direction perpendicular to the surface; and
an inclined portion that is inclined toward the tire radial direction inner side and toward the width direction sipe side at the groove bottom side.
7. The pneumatic tire of claim 6,
the inclined portion is inclined at an inclination of 5 ° or more and 45 ° or less with respect to a straight line passing from an intersection of the side portion of the partition wall portion and the surface and extending perpendicularly to the surface.
8. The pneumatic tire according to claim 1 or 2,
the intersecting sipes are formed of a plurality of partial sipes formed intermittently.
9. The pneumatic tire of claim 8,
the intersecting sipes are constituted by a plurality of partial sipes formed at different positions in the tire width direction.
10. The pneumatic tire of claim 8,
the intersecting sipes are constituted by a plurality of partial sipes formed at different positions in the tire circumferential direction.
CN201810281238.4A 2017-04-27 2018-04-02 Pneumatic tire Active CN108790616B (en)

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CN111791649B (en) * 2019-04-03 2024-02-13 住友橡胶工业株式会社 Tire with a tire body
US20220410634A1 (en) * 2019-12-13 2022-12-29 The Yokohama Rubber Co., Ltd. Tire

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JPH06247110A (en) * 1993-02-23 1994-09-06 Toyo Tire & Rubber Co Ltd Pneumatic tire
JP3378789B2 (en) * 1998-02-27 2003-02-17 住友ゴム工業株式会社 Pneumatic tire
JP4086176B2 (en) * 2001-03-01 2008-05-14 東洋ゴム工業株式会社 Pneumatic radial tire
JP4726106B2 (en) * 2001-09-20 2011-07-20 東洋ゴム工業株式会社 Pneumatic tire
JP3686041B2 (en) * 2002-02-04 2005-08-24 東洋ゴム工業株式会社 Pneumatic tire
EP1818189B1 (en) * 2004-11-30 2010-09-01 The Yokohama Rubber Co., Ltd. Pneumatic tire
JP4825288B2 (en) * 2009-08-24 2011-11-30 住友ゴム工業株式会社 Pneumatic tire
JP5108924B2 (en) * 2010-10-07 2012-12-26 住友ゴム工業株式会社 Pneumatic tire
JP2013116708A (en) * 2011-12-05 2013-06-13 Sumitomo Rubber Ind Ltd Pneumatic tire
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