Motorcycle tire for rough terrain

A motorcycle and tire technology, applied to motorcycle tires, motorcycles, off-road vehicle tires, etc., can solve the problems of reduced traction performance and braking performance, reduced sinking degree, and large amount of tread block sinking, so as to improve traction. Performance and braking performance, improved edge components, improved cornering performance

Active Publication Date: 2012-07-11
SUMITOMO RUBBER IND LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, on loose roads, since each block sinks in a large amount, most of the crown blocks will also touch the ground when cornering.
In the above-mentioned crown blocks, there is a problem that cornering performance cannot be sufficiently improved because there are few edge components in the tire circumferential direction.
[0006] In addition, although it is also conceivable to increase the edge component in the tire circumferential direction by increasing the length of the crown block in the tire circumferential direction, there is still a problem that the ground contact area is excessively increased and the degree of sinking on soft roads is reduced, thereby reducing the traction when driving straight. performance and braking performance

Method used

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  • Motorcycle tire for rough terrain
  • Motorcycle tire for rough terrain
  • Motorcycle tire for rough terrain

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Experimental program
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Embodiment

[0075] Manufactured as figure 1 The tires with the basic structure shown in Table 1 and the dislocation blocks shown in Table 1, and their performances were evaluated. And, for comparison, a Figure 5 A tire without misaligned blocks is shown and evaluated similarly. Among them, the common specifications are as follows.

[0076] Tire size:

[0077] Front wheel: 90 / 100-21

[0078] Rear wheel: 120 / 80-19

[0079] Rim size:

[0080] Front wheel: 1.60×21

[0081] Rear wheel: 2.15×19

[0082] Tread width TW: 145mm

[0083] Tread expansion width TWe: 175mm

[0084] Groove depth D1: 15mm

[0085] Land ratio (Sb / S): 25%

[0086] Recess:

[0087] The maximum width W5 in the tire axial direction: 32mm

[0088] The maximum length L5 in the tire circumferential direction: 12mm

[0089] Depth: 0.5mm

[0090] Ratio (W5 / TWe): 18.3%

[0091] Ratio (L5 / W5): 37.5%

[0092] Crown blocks:

[0093] Length L1 in the tire circumferential direction: 20mm

[0094] The width W1 of the...

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Abstract

The invention provides a motorcycle tire (1) for rough terrain, which can maintain the traction performance and braking performance when a motorcycle travels straight and improve the turning performance. Blocks (11) include crown blocks (16) arranged in a center area (Cr) of a tread portion (2), shoulder blocks (17) arranged in a grounded junction (2t) of the tread portion, and middle blocks (18) arranged between the crown blocks (16) and the shoulder blocks (17). The crown blocks (16) have a smallest aspect ratio, which is a ratio (L / W) of the tire circumferential length L to the tire axial width W. and the shoulder blocks (17) have a largest aspect ratio.The crown block (16) is divided into two small block segments (21, 21) by one circumferentially extending slit (20) in a center portion of its widthwise direction to the tire circumferential direction. And the two small block segments (21, 21) includes a shift block (27) shifting in the tire circumferential direction through the extending slit (20)

Description

technical field [0001] The present invention relates to a motorcycle tire for running on uneven ground, capable of maintaining the traction performance and braking performance during straight running, and improving the turning performance. Background technique [0002] A motorcycle tire for running on rough terrain (hereinafter, sometimes simply referred to as a "tire") used off-road or the like has a plurality of blocks formed on a tread portion (see, for example, Patent Document 1 below). Such tires allow each block to sink into soft roads such as sandy or muddy ground, and obtain traction and cornering force through its edges, thereby improving steering stability. [0003] In addition, the blocks include, for example, a crown block arranged in the central region of the tread portion, a shoulder block arranged on the tread contact end side, and an intermediate block arranged between the crown block and the shoulder block. Tread blocks. In order to improve the traction pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/11
CPCB60C2200/10B60C11/04B60C2200/14B60C11/11B60C11/032B60C11/1392
Inventor 石田晋吾
Owner SUMITOMO RUBBER IND LTD
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