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: 2016-03-02
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
  • Pneumatic tire

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

Pneumatic tire (3) with excellent high-speed durability and wear resistance, wherein the profile (35) of the tread surface ranging from equatorial plane (CL) to tread edge (28) is formed of multiple arcs protruding in a radially outward direction, wherein when the i-th arc counted from the equatorial plane (CL) in an axially outward direction is set as arc (Ci), and when the radius of arc (Ci) is set as (Ri), then arc C(i+1) and arc (Ci) make contact at the point where they intersect; the radius (Ri+1) is not greater than radius (Ri); the amount of curvature of the tread profile is defined by a tangent to the tread profile and inclined at an given angle theta relative to the axial direction, wherein the point where the virtual line (Lt) makes contact with profile (35) of the tread surface is set as (Pt), and when the axial width from the equatorial plane (CL) to contact point (Pt) is set as (Wt), then the width (Wt) at an inclination angle theta of 3 degrees and the width (W) ranging from the equatorial plane (CL) to tread edge (28) are set to have a ratio Wt/W of 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. As representative damages of the shoulder portion, there are chunks where the tread surface is peeled off or breaker edge looseness (BEL: Breaker Edge Loose) where cords at the belt end are 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 w...

Claims

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Application Information

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Patent Type & Authority Applications(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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