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pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, vehicle components, etc., can solve the problems of insufficient improvement of partial wear resistance and wet performance of braking and driving performance, and achieve The effect of improving wetland performance

Active Publication Date: 2020-09-08
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the pneumatic tire of the above-mentioned form, although the wet performance including wear resistance and drainage performance can be improved, the improvement of wet performance including uneven wear resistance and braking and driving performance is not sufficient.

Method used

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Examples

Experimental program
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Embodiment Construction

[0080] Hereinafter, the pneumatic tire of the present invention will be described in detail with reference to the drawings. The tire circumferential direction C to be described later means that the tire 1 is rotated around the tire rotation axis Axis (refer to figure 2 ) as the center of the rotation of the tread (two rotation directions), the tire radial direction R refers to the radial direction extending perpendicular to the tire rotation axis Axis. The tire width direction W refers to a direction parallel to the tire rotation axis Axis. The outer side in the tire radial direction means the side away from the tire rotation axis Axis. The outside in the tire width direction refers to the tire equator line CL from the tire 1 (see figure 2 ) and the inner side in the tire width direction refer to the side closer to the tire equator line CL of the tire 1 .

[0081] (the main part of the tread pattern)

[0082] figure 1 (a), figure 1 (b) is a figure explaining an example...

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PUM

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Abstract

A pneumatic tire with improved wet performance including wear resistance and braking-driving performance. The tread pattern of a pneumatic tire includes: two circumferential main grooves; and circumferential shallow grooves provided in the region of the land portion sandwiched by the circumferential main grooves so as to extend in the tire circumferential direction while being bent in a zigzag shape. And the groove depth is shallower than that of the circumferential main groove. The circumferential shallow grooves include: a plurality of inclined grooves extending obliquely to one side in the tire width direction with respect to the tire circumferential direction; The ends of the adjacent inclined groove portions in the tire circumferential direction are connected to each other while being inclined to the other side in the tire width direction with respect to the tire circumferential direction, and extending to bend relative to the inclined groove portions. The extension length of the bent groove portion is shorter than that of the inclined groove portion, and the angle formed between the inclined groove portion and the bent groove portion is an acute angle. A groove bottom sipe extending along the extending direction of the bending groove is provided on the groove bottom of the bending groove.

Description

technical field [0001] The present invention relates to a pneumatic tire provided with a tread pattern on a tread portion. Background technique [0002] Pneumatic tires mounted on commercial vehicles, especially taxis, etc., have a longer travel distance than conventional pneumatic tires for passenger cars, and they frequently perform braking and driving at medium and low speeds, so excellent durability is required. Wear performance, on the other hand, requires excellent wet performance due to frequent driving even in rainy weather. As a countermeasure for improving wet performance, for example, increasing the groove area to improve drainage is mentioned. However, if the groove area is increased, it is conversely difficult to ensure a sufficient ground contact area, so there is a problem that the wear resistance is likely to decrease. In this way, wear resistance and wet performance tend to conflict, and measures to improve these performances at the same time are required. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03
CPCB60C11/03B60C2011/0351B60C2011/0355B60C2011/0369
Inventor 恒川大玄
Owner THE YOKOHAMA RUBBER CO LTD