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Sumitomo rubber ind

A motorcycle and tire technology, applied to motorcycle tires, motorcycles, off-road vehicle tires, etc., can solve the problems of tire left and right shaking, resistance, inability to fully exert traction performance and braking performance, etc. Effects of improving traction performance, improving traction performance and braking performance

Inactive Publication Date: 2013-01-16
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there is a problem in such a center block as described above: on a slightly hard uneven road surface, etc., the edge of the tire axial direction having a large width tends to become a large resistance against the road surface, and cannot sufficiently sink into the road surface.
As a result, the central block is in a state of floating on the road surface, so the tire tends to shake left and right due to the inclination and resistance of the road surface, and the traction performance and braking performance during straight driving cannot be fully exerted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] Manufactured as figure 1 The tires having the basic structure shown in Table 1 and having the central blocks, middle blocks and shoulder blocks shown in Table 1 were evaluated for their performance. And, for comparison, a Figure 5 The conventional tire (Comparative Example 1) shown in (a) and the tire (Example 17) in which the positions of the centroids of the middle blocks were the same in the tire axial direction were evaluated in the same way. Among them, the common specifications are as follows.

[0086] Tire size:

[0087] Front wheel: 80 / 100-21

[0088] Rear wheel: 120 / 80-19

[0089] Rim size:

[0090] Front wheel: 1.60×21

[0091] Rear wheel: 2.15×19

[0092] Tread width TW: 97mm

[0093] Tread expansion width TWe: 118.72mm

[0094] Half of the tread width 0.5TWe: 59.36mm

[0095] Land Ratio (SL / S): 10%

[0096] Pattern block:

[0097] Height D1: 15mm

[0098] Central block:

[0099] Maximum width W11: 11mm

[0100] Maximum length L11: 11mm

[01...

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Abstract

A motorcycle tire for running on rough terrain comprises a tread portion provided with a plurality of blocks defining a block pattern. The blocks include center blocks whose centroids of their top surfaces are disposed within a center region of the tread portion defined as being centered on the tire equator and having a developed width of 25 % of a developed tread width. The top surface of each of the center blocks is provided with an axially extending edge extending straight and parallel with the tire axial direction, and arc edges curved convexly toward the centroid of the top surface and disposed on both sides of the axially extending edge in the tire axial direction.

Description

technical field [0001] The present invention relates to a motorcycle tire for running on uneven ground, capable of improving the traction performance and braking performance during straight running. Background technique [0002] Motorcycle tires for running on uneven ground (hereinafter, sometimes simply referred to as "tires") used in motocross, etc., for example, are provided with: a central block arranged in the central region of the tread portion; arranged at the end side of the tread shoulder blocks; and intermediate blocks disposed between the central block and the shoulder blocks. [0003] In the tread of the central block, edges on both sides in the tire circumferential direction are generally formed by edges extending in the tire axial direction. Such a center block acts on the edge components in the tire axial direction during straight running, thereby improving traction performance and braking performance. Among them, there are related technologies as follows. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/11
CPCB60C11/1376B60C2200/10B60C2200/14B60C11/11B60C11/04B60C11/033B60C11/1369B60C11/1384
Inventor 石田晋吾
Owner SUMITOMO RUBBER IND LTD
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