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Pneumatic tires

A technology of pneumatic tires and tires, which is applied to heavy tires, tire parts, tire treads/tread patterns, etc., can solve problems such as uneven wear, achieve good balance, avoid excessive reduction in rigidity, and improve traction performance on snow Effect

Active Publication Date: 2021-11-05
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, tires such as the above, in addition to the fact that the tread pattern is the base tone of the block, have a high frequency of braking and driving in relation to the conditions of use, and in addition, the frequency of driving in sharp turns is also high, so there is a tendency for uneven wear to occur. Tendency, it is also required to maintain or improve the uneven wear resistance

Method used

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  • Pneumatic tires
  • Pneumatic tires
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Examples

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Effect test

Embodiment

[0056] Made conventional example 1, 22 kinds of pneumatic tires of embodiment 1~21, the tire size of these pneumatic tires is 315 / 80R22.5, has figure 1 The illustrated basic structure sets the following contents as shown in Tables 1 and 2: the tread pattern as the base tone, the average angle θa of the second groove portion of the lug groove in the inner region A with respect to the tire circumferential direction, and the outer region A. In B, the average angle θb of the second groove portion of the lug groove relative to the tire circumferential direction, the angle θc of the first groove portion of the lug groove relative to the tire circumferential direction, the magnitude relationship between the average angle θa and θb, and whether it is shallow or not Groove, groove depth of shallow groove, shape of shallow groove, shape of central shallow groove, presence or absence of repetition of projected components projecting central shallow groove toward the tire equator (repetitio...

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Abstract

The present invention provides a pneumatic tire capable of improving snow traction performance while maintaining good running performance on an unpaved road surface and uneven wear resistance performance. The lug grooves (20, 30) are alternately arranged, and the lug grooves (20, 30) are composed of: a first groove portion (21, 31) crossing the tire equator CL and extending in the tire width direction; The second groove portion (22, 32) is inclined from one end of the first groove portion (21, 31) at an angle smaller than the angle of the first groove portion (21, 31) relative to the tire circumferential direction and extends to one side of the tire equator The other end of the first groove portion (21, 31) communicates with the second groove portion (32, 22) Arranging the first groove portion (21, 31) at a position closer to the tread side than the end portion of each lug groove (20, 30) on the tread end E side, with the second groove portion (22, 32) The second groove portion (22, 32) is bent or bent in such a manner that the average angle θa in the inner region A is smaller than the average angle θb in the outer region B, and the second grooves to be adjacent in the tire circumferential direction Circumferential thin grooves (40) and lug grooves (20, 30) connecting the portions (22, 32) to each other demarcate the tread of the block (50) forming a shallow groove (60) having at least one inflection point.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as a pneumatic tire for heavy loads, and more specifically, to a pneumatic tire having improved traction performance on snow while maintaining good running performance on unpaved road surfaces and uneven wear resistance pneumatic tires. Background technique [0002] Pneumatic tires for heavy loads used for construction vehicles such as dump trucks are mainly required to be excellent in running performance (traction performance) on unpaved roads. Therefore, a block-based tread pattern having many lug grooves extending in the tire width direction is used (for example, refer to Patent Document 1). [0003] On the other hand, in recent years, the performance requirements for various tires have been increased, and in the above-mentioned tires, not only running performance on unpaved roads but also improvement in traction performance on snow is required. Moreover, tires such as those described abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03B60C11/00
CPCB60C11/11B60C2200/065B60C2200/06B60C2011/0346B60C2011/0372B60C2011/1254B60C11/1236B60C2011/1209B60C2011/0025B60C2011/0367B60C2011/0355B60C11/0302B60C11/0311B60C2011/0348B60C2011/0353B60C2011/0313B60C2011/1231B60C2011/0369B60C11/1204
Inventor 本田裕彰
Owner THE YOKOHAMA RUBBER CO LTD
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