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Pneumatic tire for motorcycles

A technology for motorized two-wheeled vehicles and pneumatic tires, which is applied in the directions of motor vehicles, motorcycle tires, tire parts, etc., can solve the problems of tire durability damage and reduction, and achieve the effect of improving durability.

Active Publication Date: 2018-03-27
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventionally, in the case of pneumatic tires for motorcycles (for example, see Patent Document 1), especially during running with a relatively high load, the durability of the tire has been damaged due to damage at the belt end or the carcass end. And lowering has become a problem

Method used

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  • Pneumatic tire for motorcycles
  • Pneumatic tire for motorcycles
  • Pneumatic tire for motorcycles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Inventive tires and comparative tires (both having a tire size of 180 / 60R16M / C) were trial-manufactured according to the specifications in Table 1, and the tires were evaluated for durability, steering stability, and uneven wear resistance. Note that in Invention Example 5 and Invention Example 12 in Table 1, since the circumferential groove 21 and the small hole 41 are arranged to overlap each other in the tire circumferential direction, the "circumferential groove 21, width direction groove 31 or small hole 41" in the table The interval L / pattern pitch" between the holes 41 is represented as 0.

[0085] Each of the test tires includes a pair of sidewall portions located outside the pair of bead portions in the tire radial direction and a tread portion straddling between the sidewall portions, wherein the carcass straddling between the bead portions is used as skeleton. More specifically, each of the test tires included a carcass composed of two layers of plies having...

Embodiment 2

[0093] Invention tires and comparative tires (both having a tire size of 180 / 60R16M / C) were trial-manufactured according to the specifications in Table 2, and the durability, noise performance and steering stability of the tires were evaluated.

[0094] Each of the test tires includes a pair of sidewall portions located outside the pair of bead portions in the tire radial direction and a tread portion straddling between the sidewall portions, wherein the carcass straddling between the bead portions is used as skeleton. More specifically, each of the test tires included a carcass composed of two layers of plies having nylon cords, and included two layers obtained by covering aramid cords with rubber on the outer side in the tire radial direction of the carcass. A belt layer and a one-layer belt layer obtained by covering nylon cords with rubber located outside the two-layer belt layer in the tire radial direction. The cord angle of the carcass ply relative to the tire width di...

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Abstract

The pneumatic tire for motorcycles is equipped with recessed portions formed intermittently along the tire circumferential direction in an intermediate region of each half of the tire, the intermediate region having a negative ratio of 15 to 45%, where the intermediate region is a region of the tread in the tire width direction, which is sandwiched by the point of the tread in the tire width direction spaced from the tire equatorial plane to the tread end by 50% of one half the peripheral width of the tread along the periphery of the tread in a reference state, and the point of the tread in the tire width direction similarly spaced by 82%.

Description

technical field [0001] The invention relates to a pneumatic tire for a two-wheeled motor vehicle. Background technique [0002] Conventionally, in the case of pneumatic tires for motorcycles (for example, see Patent Document 1), especially during running with a relatively high load, the durability of the tire has been damaged due to damage at the belt end or the carcass end. And lowering has become a problem. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2000-158910 Contents of the invention [0006] The problem to be solved by the invention [0007] The inventors have found that the cause of the breakage of the belt end or ply end is that during running, the temperature inside the tire increases near the ground contact end of the tire where the belt end or ply end is usually located, and found that the heat dissipation of this part is accelerated It is effective for improvement of tire durability. ...

Claims

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Application Information

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IPC IPC(8): B60C11/03B60C11/00
CPCB60C2200/10B60C2011/0341B60C2011/0358B60C2011/0381B60C11/033B60C11/0302B60C2011/0346
Inventor 梶本胜彦
Owner BRIDGESTONE CORP
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