Motorcycle tire for running on rough terrain

A motorcycle and tire technology, applied to motorcycle tires, motorcycles, off-road vehicle tires, etc., can solve the problems of unexpectable turning performance and improvement, and achieve the effect of improving turning performance and maintaining traction performance

Inactive Publication Date: 2012-02-08
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the tires described in the above-mentioned patent documents, since only the edge is relied upon, t

Method used

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  • Motorcycle tire for running on rough terrain
  • Motorcycle tire for running on rough terrain
  • Motorcycle tire for running on rough terrain

Examples

Experimental program
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Embodiment

[0082] Prototype has figure 1 The basic structure shown in Table 1 and the front wheel and rear wheel of motorcycle tires for driving on uneven ground with inclined grooves shown in Table 1, and their performances were tested. In addition, the common specifications are as follows.

[0083] tire size

[0084] Front wheel: 90 / 100-21

[0085] Rear wheel: 120 / 80-19

[0086] Rim size

[0087] Front wheel: 1.60×21

[0088] Rear wheel: 2.15×19

[0089] Tread width TW: 150.0mm

[0090] Tread expansion width TWe: 169.5mm

[0091] Land ratio (Sb / S): 20.5%

[0092] The maximum length L3 of the center crown block in the tire circumferential direction: 20.0mm

[0093] The maximum length L4 of the side crown block in the tire circumferential direction: 21.5mm

[0094] Block height D1: 16.0mm

[0095] Recess, side recess:

[0096] Maximum width W5: 30.0mm

[0097] Maximum length L5: 10.0mm

[0098] Depth D3: 0.5mm

[0099] Ratio (W5 / TWe): 17.7%

[0100] Ratio (L5 / W5): 33.3% ...

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Abstract

A motorcycle tire for running on rough terrain comprises a tread portion (2) having a developed tread width (TWe) and provided with a plurality of tread blocks (B). The tread blocks include a plurality of crown blocks (13) defined as having a ground contacting top surface whose centroid (Gb) is located within a crown region (Cr) defined as having a developed width of 1/3 of the developed tread width (TWe) and centered on the tire equator. The crown blocks include a plurality of central crown blocks (13a) whose axial distance (L1) from the tire equatorial plane to the centroid is not more than 2 % of the developed tread width, and a plurality of off-center crown blocks (13b) whose axial distance (L2) from the tire equatorial plane to the centroid is more than 2 % and not more than 6 % of the developed tread width.

Description

technical field [0001] The present invention relates to a tire for motorcycles for driving on rough terrain capable of maintaining traction performance during straight travel and improving cornering performance. Background technique [0002] Motorcycle tires for running on uneven ground used in off-road motorcycle races, etc., are provided with a plurality of blocks on the tread portion. The blocks include, for example, crown blocks arranged on the equator of the tire, along the tread end The shoulder block is arranged, and the middle block is arranged between the crown block and the shoulder block. Such tires can sink each tread block into soft roads such as sandy ground and muddy ground, thereby improving traction performance and cornering performance. [0003] In order to further improve cornering performance, Patent Document 1 below proposes a tire in which an axially outer side surface of a middle block is provided with an inclined surface. In such a tire, the axially...

Claims

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Application Information

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IPC IPC(8): B60C11/03B60C11/11
CPCB60C2200/10B60C11/11B60C2200/14B60C11/1369B60C11/0306B60C11/0309
Inventor 疋田真浩
Owner SUMITOMO RUBBER IND LTD
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