Pneumatic tire for front wheel of motorcycle

Inactive Publication Date: 2002-01-03
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tire having the above cross structure belt is difficult to flexibly absorb the pushing up of micro-irregularities on the road to the tread surface of the tire and the micro-oscillation of the handle resulted therefrom.
In the above pneumatic tire for the motorcycle, however, the pushing quantity of a central portion of the tread becomes large with the increase of the speed to decrease the ground contacting area of the tread, which causes the lowering of the stability in the high speed running.
However, when the ti

Method used

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  • Pneumatic tire for front wheel of motorcycle
  • Pneumatic tire for front wheel of motorcycle
  • Pneumatic tire for front wheel of motorcycle

Examples

Experimental program
Comparison scheme
Effect test

Example

[0069] There are provided three tires of Example 1 and Conventional Examples 1 and 2 for use in a front wheel of a motorcycle, respectively.

[0070] In the tire of Example 1, the tread has a cap / base structure shown in FIG. 1. In the conventional tires, the tread is made of a single rubber. The hardness of rubber constituting the tread and the like is shown in Table 1. Moreover, all of these tires have two carcass plies containing nylon cords therein and a spiral belt layer containing Kevlar cords therein.

[0071] Each of these tires is mounted onto a front wheel of a motorcycle (HONDA CBR1100XX) and actually run on a test circuit course by a professional rider, during which the high-speed straight running stability, shimmy resistance, handling nimbleness / response and over-steering of handle at a low speed are evaluated to obtain results as shown in Table 1. Each property is represented by an index on the basis that the tire of Conventional Example 1 is 100, wherein the larger the index...

Example

Examples 2-3 Comparative Examples 1-3

[0073] There are provided two pneumatic tires having a tire size of 120 / 70ZR17 and a basic structure shown in FIG. 3 comprising a carcass of two nylon cord plies and a spiral belt layer of Kevlar cord with a belt width of 140 mm, wherein the tire of Example 2 is provided with a rubber sheet located inside an innermost carcass ply and having a thickness of 0.5 mm and a width of 70 mm as a reinforcing layer, and the tire of Example 3 is provided with a rubberized nylon cord layer of 840 d located inside the innermost carcass ply as a reinforcing layer. Each of these tires is mounted onto a front wheel of a motorcycle (HONDA CB 1100XX) and actually run at a high speed (250 km / h), during which the straight running stability, shimmy resistance, handling nimbleness / response, cornering force / gripping force and ride comfort are measured together with a tire of Comparative Example 1 having no reinforcing layer, a tire of Comparative Example 2 having the r...

Example

[0074] When all of the measured results are represented by an index on the basis that the tire of Comparative Example 1 is 100 (the larger the index value, the better the property), the tire of Comparative Example 2 has the straight running stability of 90, shimmy resistance of 130, handling nimbleness / response of 110, cornering force / gripping force of 90 and ride comfort of about 85, and the tire of Comparative Example 3 has the straight running stability of 80, shimmy resistance of 120, handling nimbleness / response of 100, cornering force / gripping force of 80 and ride comfort of about 90.

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PUM

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Abstract

A pneumatic tire for a front wheel of a motorcycle comprises a pair of bead cores, a radial carcass toroidally extending between the pair of bead portions, a belt disposed on a radially outer surface of the carcass, and a tread portion disposed thereon, wherein the carcass is comprised of at least one carcass ply containing organic fiber cords, and the belt is a spiral belt layer formed by spirally winding a continuous rubberized cord or a continuous ribbon-shaped body containing plural cords therein in a widthwise direction of the tire, and the tread portion has a two-layer structure comprised of a cap rubber layer and a base rubber layer in at least a central region in the widthwise direction of the tire, or a reinforcing layer is disposed inside an innermost carcass ply or on an inner surface of an innerliner, or the bead core is a helically wound laminate of a single steel wire having a polygonal shape at a section of the bead core in the radial direction.

Description

[0001] 1. Field of the Invention[0002] This invention relates to pneumatic tires for motorcycles, and more particularly to a pneumatic tire for a front wheel of a motorcycle capable of preventing the occurrence of shimmy in the high-speed running to improve a steering stability, particularly straight running stability.[0003] 2. Description of Related Art[0004] In the pneumatic tire particularly mounted onto a front wheel of a motorcycle, the steering performances such as handling and the like are considered to be important, so that it is usual to adopt a belt comprised of at least two belt layers, cords of which belt layers being crossed with each other, or so-called cross structure belt up to the present time.[0005] With the recent advancement of weight reduction and higher performances in a vehicle, a micro-oscillation of a handle or so-called shimmy phenomenon is actualized in the motorcycle. Particularly, it is strongly demanded to prevent the occurrence of shimmy at a high freq...

Claims

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Application Information

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IPC IPC(8): B60C5/14B60C9/02B60C9/14B60C9/18B60C9/22B60C11/00B60C15/00B60C15/04B60C15/06
CPCB60C5/14Y10T152/10783B60C9/14B60C9/18B60C9/22B60C11/00B60C15/0072B60C15/04B60C15/06B60C11/0058B60C11/005B60C2200/10B60C2015/048Y10T152/10765B60C9/02
Inventor NAKAMURA, TSUTOMU
Owner BRIDGESTONE CORP
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