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
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  • 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, d

Method used

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Examples

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Example Embodiment

[0094]Example

[0095]In this example, regarding various types of pneumatic tires with different conditions, it is related to the steering stability performance on dry roads (also called dry road performance) and the steering stability performance on wet roads (also called wet road performance). Performance test (referenceFigure 4).

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

[0097]In the evaluation method of handling stability performance on dry roads, driving in a test field on dry roads, professional test drivers conduct sensory evaluations on braking drive performance, lane changing performance, turning performance, etc. Regarding this evaluation, an index evaluation based on the conventional example (100) was performed. This evaluation shows that the

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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

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Claims

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Application Information

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Owner YOKOHAMA RUBBER CO LTD
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