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Pneumatic tire for motor-bicycle

A technology for motorized two-wheeled vehicles and pneumatic tires, which is applied to the reinforcement layer of motor vehicles, pneumatic tires, motorcycle tires, etc., can solve the problem of inability to apply driving force, etc. The effect of improving traction performance

Inactive Publication Date: 2010-10-06
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, imagine that when accelerating with the tires tilted, driving force should be applied to the tires, but the tread near the center that is already in the driving state immediately exerts driving grip performance when driving force is applied to the tires. On the other hand, the tread that is already in the driving state The primary braking deformation of the tread on the tread end of the braking state is canceled out, and then transformed into deformation on the driving side, and driving force can hardly be applied

Method used

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  • Pneumatic tire for motor-bicycle
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  • Pneumatic tire for motor-bicycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0066] According to the following conditions, tire size 190 / 50ZR17 was manufactured with the following figure 1 A pneumatic tire for motorcycles having a cross-sectional structure as shown. Each test tire had a carcass ply composed of two carcass plies extending toroidally between a pair of bead cores. Here, nylon fibers are used for the carcass ply. The angle of the two-ply carcass is the radial direction (the angle with respect to the equator direction is 90 degrees). In addition, as shown in the drawing, the ends of the respective carcass plies are pinched and locked by bead wires from both sides of the bead portion.

[0067] In addition, a spiral belt layer is disposed outside the carcass in the tire radial direction. In Example 1, the both end regions of the spiral belt layer are layers made of twisted nylon cords, and the central region is made of twisted aramid (trade name: Kevlar). ), hereinafter, in this embodiment, the trade name "Kevlar" is also sometimes used ...

Embodiment 4

[0072] According to the following conditions, a figure 2A pneumatic tire for motorcycles having a cross-sectional structure as shown. The carcass ply is one layer, and is arranged in the radial direction (the angle with respect to the equator direction is 90 degrees). In addition, on the outside of the spiral belt in the tire radial direction, two belt intersecting layers were arranged instead of a belt reinforcing layer. The belt intersecting layer was formed by arranging cords having a diameter of 0.5 mm twisted with aramid fibers at a beating density of 50 threads / 50 mm. The angle of the belt intersecting layers is ±60 degrees with respect to the tire direction, and they cross each other. The arrangement width of the belt intersecting layers was 250 mm for the first layer (inner side) and 230 mm for the second layer (outer side).

Embodiment 5

[0074] According to the following conditions, a image 3 A pneumatic tire for motorcycles having a cross-sectional structure as shown. The carcass ply is one layer, and is arranged in the radial direction (the angle with respect to the equator direction is 90 degrees). In addition, two belt intersecting layers similar to those in Example 4 were arranged on the inner side of the spiral belt in the tire radial direction. Therefore, in this case, the belt intersecting layers exist immediately outside the carcass, and the spiral belt layer exists further outside the belt intersecting layers. In addition, on the outer side of the spiral belt layer in the tire radial direction, a belt reinforcement layer made of aramid fiber having an angle of 90 degrees with respect to the tire circumferential direction was arranged in the same manner as in Example 1. The tread is located on the outer side of the belt reinforcement layer.

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Abstract

This aims to provide a pneumatic tire for a motor-bicycle, which can improve a traction performance at a deep cornering time of inclining the bicycle body especially deeply and stability at the body inclining time, without deteriorating other performances. The motor-bicycle pneumatic tire comprises a tread portion (11) made annular, and a spiral belt layer (3) formed on the radially inner side of the crown portion of the tread (11) and having an angle of 0 to 5 degrees in the circumferential direction of the tire and an arrangement width of 0.5 to 0.8 times as large as the tread width. The spiral belt layer (3) is widthwise divided into three, and the tensile elastic modulus of the cords constituting the two end regions of the trisected spiral belt layer (3) is lower than that of the cord constituting the central region.

Description

technical field [0001] The present invention relates to a pneumatic tire for motorcycles (hereinafter also simply referred to as a "tyre"), and specifically, to a pneumatic tire for motorcycles in which a spiral belt layer has been improved. Background technique [0002] In a tire for a high-performance motorcycle, since the rotational speed of the tire is high, the influence of centrifugal force is large, and the tread portion of the tire expands outward, which may impair steering stability. Therefore, a tire structure has been developed in which a reinforcement member (coil member) of organic fiber or steel wire is wound around a tread portion of the tire substantially parallel to the equatorial plane of the tire. [0003] Examples of the spiral member used in the spiral belt layer include nylon fibers, aramid (trade name: Kebra), steel wires, and the like. In particular, aramid and steel wires have recently been attracting attention because they do not stretch even at hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/18B60C9/20B60C9/22
CPCB60C9/2009B60C9/28B60C2200/10B60C2009/2295B60C9/2204Y10T152/10765Y10T152/1081
Inventor 片山辰作石山诚
Owner BRIDGESTONE CORP
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