Pneumatic tire

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve the problems of wet road performance degradation and drainage function degradation, so as to improve performance on ice and ensure drainage Function, the effect of excellent wet road performance

Inactive Publication Date: 2010-03-24
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the ratio of the groove area is simply reduced, there is a problem that the drainage function decreases and the wet road performance decreases.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] ready to have figure 1 The pneumatic tire with the tread pattern (Example 1) and having Figure 4 The pneumatic tire with the tread pattern (Example 2), wherein the tire size is 225 / 65R17. For comparison, prepare to have Figure 5 Pneumatic tires with a tread pattern (conventional example). In the conventional example, long blocks having a length in the circumferential direction spanning the three blocks of the shoulder block row are arranged in the middle block row.

[0048] For these tires, braking performance on ice, braking performance on wet road, and drainage performance on wet road were evaluated by the following evaluation methods, and the results are shown in Table 1.

[0049] Braking performance on ice:

[0050] The test tire was assembled on a wheel with a rim size of 17×7J and mounted on a test vehicle. The air pressure was set to 200 kPa, and the vehicle was braked from a speed of 40 km / h on ice to measure the braking distance. The evaluation result wa...

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Abstract

A pneumatic tire achieving good on-ice performance and good wet performance at the same time is provided. A pair of first main grooves extending in the circumferential direction of the tire is provided in the center region of a tread. A pair of second main grooves extending in the circumferential direction of the tire is provided on both the outer sides of the pair of first main grooves. First luggrooves and second lug grooves are alternately arranged in the circumferential direction of the tire such that the first lug grooves extend inward in the lateral direction of the tire from each shoulder end of the tread and communicate with the corresponding one of the first main grooves and further such that the second lug grooves extend inward in the lateral direction of the tire from the shoulder end of the tread and do not communicate with the corresponding one of the first main grooves. A center rib is arranged to extend between the pair of first main grooves. A shoulder block row composed of blocks is arranged between each second main groove and the corresponding one of the shoulder ends, and an intermediate shoulder block row composed of blocks is arranged between the second main groove and the adjacent one of the first main grooves. In the intermediate shoulder block row are arranged long blocks having a circumferential length equivalent to the length of two blocks of the shoulder block row.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as a winter tire, and more specifically, to a pneumatic tire capable of achieving both performance on ice and performance on wet roads. Background technique [0002] In the past, in winter tires represented by studless tires, block patterns are mostly used, that is, tread patterns in which a plurality of sipes extending in the tire width direction are formed on each block pattern (for example, refer to Patent Document 1). [0003] For such tires, in order to improve performance on ice, it is effective to reduce the ratio of the groove area and increase the ground contact area. However, if the groove area ratio is simply reduced, there is a problem in that the drainage function is reduced and the wet road performance is reduced. That is, the on-ice performance and the wet performance are in a conflicting relationship. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2005-349970 Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/11B60C11/03B60C11/12
CPCB60C2011/1213B60C2011/0388B60C2011/1295B60C11/033B60C11/0309B60C11/0302B60C11/1315B60C11/12
Inventor 山川贵弘
Owner THE YOKOHAMA RUBBER CO LTD
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