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Pneumatic tire for running on rough terrain

A technology for inflating tires and ground, applied to motorcycle tires, off-road vehicle tires, tire parts, etc., to achieve the effect of improving handling stability and friction

Active Publication Date: 2013-10-30
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, even with the above-mentioned pneumatic tire for driving on uneven ground, there is still room for further improvement in terms of maintaining ride comfort and ground feeling and improving steering stability.

Method used

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  • Pneumatic tire for running on rough terrain
  • Pneumatic tire for running on rough terrain
  • Pneumatic tire for running on rough terrain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] Manufacturing has figure 1 The motorcycle tires for running on rough terrain having the basic structure shown in Table 1 and having shifted blocks shown in Table 1, and their performances were evaluated. In addition, for comparison, Comparative Examples 1 to 3 were also evaluated in the same manner. Comparative Example 1 is a conventional tire having no shifted blocks and notched blocks. In addition, Comparative Example 2 is a tire in which shifted blocks are arranged as crown blocks, and conventional blocks having no grooves are arranged in the middle blocks and shoulder blocks. In addition, Comparative Example 3 is a tire in which notched blocks are arranged as middle blocks and shoulder blocks, and conventional blocks having no slits are arranged as crown blocks. In addition, the common specifications of each tire are as follows.

[0101] Vehicle used: Displacement 450cc motorcycle

[0102] Tire size:

[0103] Front wheel: 90 / 100-21

[0104] Rear wheel: 120 / 80-...

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PUM

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Abstract

A pneumatic tire for running on rough terrain is provided in the tread portion with crown blocks, middle blocks and shoulder blocks. Aspect ratios of the crown blocks are less than those of the middle blocks and shoulder blocks. The crown blocks include shifted blocks provided with a slot to form two subdivided block pieces circumferentially shifted from each other. The middle blocks and the shoulder blocks including cut blocks provided with a U-shaped cut opened at the top face and a side face of the block.

Description

technical field [0001] The present invention relates to a pneumatic tire for driving on uneven ground that improves steering stability without deteriorating ride comfort and ground feel. Background technique [0002] For example, a pneumatic tire for running on rough terrain (hereinafter, may be simply referred to as a "tire") used for off-road use has a plurality of blocks in a tread portion. In such tires, since the blocks are embedded in soft roads such as sandy ground and muddy ground, the edges of the blocks, that is, the block edges, can obtain traction force and cornering force to improve steering stability. [0003] In addition, in order to improve the steering stability, conventionally, there have been proposed methods of increasing the edge effect by enlarging the blocks, or increasing the rubber hardness of the blocks to increase the grip force. However, if the block rigidity is increased, there is a problem that the riding comfort and the grounding feeling are l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/12B60C11/13
CPCB60C2200/10B60C11/1376B60C2200/14B60C11/12B60C11/11
Inventor 石田晋吾
Owner SUMITOMO RUBBER IND LTD
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