Pneumatic tire

A technology for pneumatic tires and tires, applied in pneumatic tires, tire parts, tire treads/tread patterns, etc., can solve problems such as uneven edge wear, improve heat dissipation, excellent turning performance, and inhibit uneven wear. Effect

Active Publication Date: 2017-02-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the vehicle is turning, the concave portion provided on the tread portion of the outer tire acts on the edge of the inner tread end side with a large ground contact pressure, so that the edge tends to be unevenly worn.
Therefore, the pneumatic tire of Patent Document 1 has room for further improvement in the improvement of uneven wear resistance.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] Based on the specifications in Table 1, a trial production with figure 1 The basic tread pattern is a pneumatic tire of size 205 / 55R16. As Comparative Example 1, the following tires were trial-manufactured: Figure 7 As shown, the profile of the recess is circular in shape, and as Figure 8 As shown, in the section along the tire axial direction, the depth of the concave portion is constant. The cornering performance and uneven wear resistance of each test tire were tested. The general specifications and test methods of each test tire are as follows.

[0062] Rim: 16×7.0JJ

[0063] Tire internal pressure: 200kPa

[0064]

[0065] The cornering performance when the following test vehicle mounted with the above-mentioned test tires was used to run on an asphalt circular course was evaluated by the driver's senses. The results were rated with Comparative Example 1 as 100, and the larger the numerical value, the better the handling stability.

[0066] Test vehicle:...

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PUM

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Abstract

The present invention provides a pneumatic tire which maintains both the turning performance and the nonuniform wear resistance. A plurality of recesses (10) are provided on the tread surface of the tread portion (2). Each of the recesses (10) has a closed contour shape (11) formed by a smooth curve on the surface of the tread portion (2) and has an inclined surface (12). The depth of the inclined surface (12) gradually decreases from the outer tread end (Te2) side toward the inner tread end (Te1) side in the cross section along the tire axial direction. The length of the tire in the axial direction of the inclined surface (12) is 60% or more of the length of the tire in the axial direction of the recess (10).

Description

technical field [0001] The present invention relates to a pneumatic tire capable of improving uneven wear resistance while maintaining cornering performance. Background technique [0002] For example, Patent Document 1 below proposes a pneumatic tire in which a concave portion is provided in a tread portion. Such recesses contribute to the improvement of wet performance, and increase the outer surface area of ​​the tread portion, thereby improving its heat dissipation. [0003] Generally, when the vehicle turns, the outer tires in the direction of rotation (hereinafter referred to as "outer tires") act on a larger ground contact pressure, so the tread portions of the outer tires tend to wear. On the tread portion of the outer tire, when the vehicle turns, a resultant force of gravity and centrifugal force directed outward in the direction of rotation acts. Therefore, when the vehicle is turning, the concave portion provided on the tread portion of the outer tire acts on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C5/00B60C11/117
CPCB60C5/00B60C11/1204B60C11/0304B60C11/0309B60C2011/0341B60C2011/0355B60C2011/0367
Inventor 小高和真中野敏幸中野敬太
Owner SUMITOMO RUBBER IND LTD
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