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Pneumatic tyre

A technology for pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire tread/tread pattern, etc., which can solve the problems of wear and partial wear tracks, and achieve the purpose of suppressing track wear, sliding, and wear uniform effect of development

Active Publication Date: 2014-08-06
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with such a pneumatic tire, there is room for further improvement in suppressing partial wear.
[0004] In addition, when the ground contact pressure of the shoulder land portion c is increased to suppress slipping with the road surface in order to suppress the wear of the shoulder defect, there is a possibility that slippage between the middle land portion f and the road surface is likely to occur, and the distance between the middle land portion f and the road surface may be reduced. The so-called track wear in which the outer end e produces guide rail-like partial wear

Method used

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  • Pneumatic tyre
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0064] Based on the specifications in Table 1 a prototype was formed as figure 1 basic structure, and has figure 2 Pneumatic tires for light trucks with a tread pattern size of 185 / 65R15, and tested the partial wear of each test tire, the presence or absence of shoulder defect wear, the anti-slip performance and the heat dissipation of the shoulder land.

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Abstract

The invention provides a pneumatic tyre which can inhibit uneven wear on the tread. The pneumatic tyre is divided into a pair of tyre shoulder land parts (40) and a pair of middle land parts (20) through the arrangement of a central main groove and a pair of tyre shoulder main grooves (10). Rims (23) on two circumferential sides of the middle land parts (20) stretch to axial outer sides of the tyre obliquely in an angle [alpha] relative to the axial direction of the tyre, the angle [alpha] being in the range of 5 to 12 DEG. Rims (43) on two circumferential sides of the tyre shoulder land parts (20) inclides in an angle [beta] relative to the axial direction of the tire, the angle [beta] being larger than the angle [alpha] and smaller than 17 DEG. The tyre peripheral distance (L1) between an axial inner end (46) and an axial outer end (47) of the rims (43) of the tyre shoulder land parts (40) is 0.03 to 0.12 times of the circumferential grounding length (L2) of the tyre shoulder land parts (40).

Description

technical field [0001] The invention relates to a pneumatic tire which improves the shape of the contact surface and improves the partial wear resistance. Background technique [0002] Such as Figure 5 As shown, various types of pneumatic tires have conventionally been proposed that have main grooves a extending continuously in the tire circumferential direction in the vicinity of the tread edge b. Such a pneumatic tire has a problem that so-called shoulder chip wear tends to occur in which the outer end portion d in the tire axial direction of the shoulder land portion c between the main groove a and the tread edge b is worn unevenly. [0003] In response to such a problem, for example, the following Patent Document 1 proposes a pneumatic tire in which the rigidity of each land portion extending in the tire circumferential direction is rationalized by specifying the number of sipes formed in the land portion, thereby suppressing the Partial wear of the land part. However...

Claims

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Application Information

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IPC IPC(8): B60C11/03B60C9/02
CPCB60C2011/0344B60C11/01B60C11/03B60C11/04B60C11/12
Inventor 津田训
Owner SUMITOMO RUBBER IND LTD