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pneumatic tire

A technology of pneumatic tires and treads, which is applied to special tires, tire parts, and no separate inflatable pads, etc., can solve problems such as shortening tire life, and achieve the effect of reducing load

Active Publication Date: 2018-11-16
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this tire, the life of the tire may be shortened due to partial wear of the shoulder portion

Method used

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  • pneumatic tire
  • pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] obtain figure 1 The tire of Example 1 of the structure shown. The size of this tire is 235 / 45R17. Each element of this tire is shown in Table 1. The width Wt shows values ​​when θ is 3° and when θ is 5°. In this tire, the number of arcs constituting the outer shape is four.

Embodiment 2

[0115] obtain figure 1 The tire of Example 2 of the structure shown. The size of this tire is 235 / 60R18. Each element of this tire is shown in Table 1. In this tire, the number of arcs constituting the outer shape is four.

Embodiment 3

[0119] obtain figure 1 The tire of Example 3 of the structure shown. The size of this tire is 215 / 60R16. Each element of this tire is shown in Table 1. In this tire, the number of arcs constituting the outer shape is three.

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PUM

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Abstract

A pneumatic tire. The present invention provides a tire having both excellent high-speed durability and wear resistance. In this tire (3), the outer profile (35) of the tread surface from the equatorial plane CL to the tread end (28) is formed by a plurality of circular arcs protruding radially outward. Among the arcs, let Ci be the i-th arc outward in the axial direction from the equatorial plane CL, and when the radius of the arc Ci is Ri, the arc C(i+1) and the arc Ci are tangent at their intersection. The radius R(i+1) is below the radius Ri. Let Lt be an imaginary line inclined by an angle θ with respect to the axial direction, and let Pt be the tangent point when this imaginary line Lt is tangent to the outer profile (35) of the tread surface. When the axial width of Pt is Wt, the ratio of the width Wt at an inclination angle θ of 3° to the axial width W from the equatorial plane CL to the tread end (28) is less than 65%.

Description

technical field [0001] The present invention relates to pneumatic tires. Background technique [0002] In recent years, due to the high performance of vehicles, tires are required to have high high-speed durability. The parts that are vulnerable to damage due to high-speed driving are the shoulders and sidewalls. Typical damages of the shoulder portion include breaker edge loosening (BEL: Breaker Edge Loose) in which the tread surface is peeled off or the belt end cord is peeled off from the surrounding rubber. This often occurs especially in tires with an aspect ratio of 55% or less. Typical damage to the sidewall portion is detachment (loosening) of the bezel and the carcass. This occurs especially in tires with an aspect ratio of 60% or more. Suppression of the above-mentioned damage is important in improving high-speed durability. [0003] In order to achieve driving stability when cornering, most vehicles use negative camber. In tires with camber, there is a tende...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/00B60C11/01
CPCB60C11/0083B60C3/04B60C5/12
Inventor 植田宪二
Owner SUMITOMO RUBBER IND LTD
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