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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to pneumatic tires, tire parts, tire treads/tread patterns, etc., and can solve the problems of decreased handling stability on wet roads, deterioration of grounding performance, and decreased handling stability on dry roads. To achieve the effect of improving the handling stability and wetness, improving the handling stability, and improving the handling stability

Active Publication Date: 2021-02-05
YOKOHAMA RUBBER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the ground contact pressure at the center of the width direction of the land portion decreases, the ground contact length of the land portion in the tire circumferential direction becomes shorter in the ground contact area, and the end of the ground contact length is dented inward, degrading the ground contact performance.
As a result, handling stability on dry roads may be reduced
In addition, since the ground contact pressure at the center of the width direction of the land portion decreases, the drainage performance decreases, and the steering stability on wet roads may also decrease.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0095] In the present example, with regard to various kinds of pneumatic tires under different conditions, the correlation between the steering stability performance on dry road (also called dry road performance) and the steering stability performance on wet road surface (also called wet road performance) was carried out. performance test (refer to Figure 4 ).

[0096] In the performance evaluation test, a pneumatic tire, which is a test tire whose nominal value is 225 / 50R17 98W size specified by JATMA, was assembled on a regular rim with a rim size of 17×75J and filled with an internal pressure of 230kPa, and assembled on a passenger car type. All rear wheels of the test vehicle.

[0097] In the evaluation method of the handling stability performance on a dry road, a professional test driver conducts sensory evaluations on braking and driving performance, lane changing performance, cornering performance, etc. while driving in a test field on a dry road. For this evaluation...

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Abstract

The present invention improves steering stability performance on dry road surfaces and steering stability performance on wet road surfaces. The land part width Wcc of a center land part 31 and the land part width Wco of an outer-side middle land part 32 satisfy the relationship Wcc<Wco. Additionally, contact surfaces 10 of each of the outer-side middle land part 32 and an outer-side shoulder landpart 34 are formed so as to protrude outward in the tire radial direction with respect to reference profiles PRco, PRso, and the protrusion amount Hco of the outer-side middle land part 32 and the protrusion amount Hso of the outer-side shoulder land part 34 satisfy the relationship Hco<Hso.

Description

technical field [0001] The present invention relates to pneumatic tires. Background technique [0002] In order to improve the steering stability on a dry road surface, it is conceivable to set the width of the land portion of the tread portion wide with a view to ensuring the rigidity of the tread. However, in this case, the ground contact pressure at the center of the width direction of the land portion decreases, the ground contact length of the land portion in the tire circumferential direction becomes shorter in the ground contact area, and the end of the ground contact length is dented inward, degrading the ground contact performance. Thus, the handling performance on dry roads may be degraded. In addition, since the ground contact pressure at the center of the width direction of the land portion is lowered, drainage performance is lowered, and steering stability performance on wet roads may also be lowered. [0003] Conventionally, for example, Patent Documents 1 to...

Claims

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Application Information

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IPC IPC(8): B60C11/00B60C5/00B60C11/03B60C11/13
CPCB60C11/1376B60C11/0304B60C2011/0341B60C2011/0388B60C2011/0381B60C2011/0383B60C11/0302B60C11/042B60C11/12B60C11/13B60C2011/0346
Inventor 友松亮一
Owner YOKOHAMA RUBBER CO LTD
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