Pneumatic tire and method of producing the same

Inactive Publication Date: 2002-05-02
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the spiral belt comprised of only the steel cord, the rigidity becomes too high and hence it is difficult to highly maintain the ride comfort and the slip resistance.
When the end count is merely reduced in the spiral belt comprised of only the steel cord, however, there are caused troubles such as lowering of breaking strength to air pressure, lowering of puncture resistance, lowering of fatigue resistances of the tread rubber and the carcass ply against repetitive bending due to the lowering of bending rigidity in a section direction.
In the spiral belt comprised of only the reinforcing fiber cord, the rigidity is lacking

Method used

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  • Pneumatic tire and method of producing the same
  • Pneumatic tire and method of producing the same
  • Pneumatic tire and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 2 example 1

Hydraulic burst pressure (KPa) 250 150 250 High-speed stability 100 120 120 Light feeling and responsibility 100 120 120 Gripping force in cornering 100 110 120 Ride comfort 100 80 90

[0054] As seen from Table 1, when the tire of Example 1 is compared with the tire of Conventional Example 1, the hydraulic burst pressure is equal to and the ride comfort is somewhat low, but the other running performances are higher than those of the conventional tire. And also, the running performances in the tire of Example 1 are equal to or more than those of the tire of Conventional Example 2.

[0055] On the other hand, each of these tires is subjected to a running test by mounting onto a motorcycle as a front tire in addition to a hydraulic burst pressure test to obtain results as shown in Table 2. In this case, a radial tire comprising a circumferential belt of KEVLAR is used as a rear tire.

2 TABLE 2 Conventional Conventional Example 1 Example 2 Example 1 Example 2 Hydraulic burst 250 150 250 220 p...

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PUM

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Abstract

A pneumatic tire comprises a spiral belt formed by spirally winding a cord(s) along a circumferential direction of a torus tread, wherein the spiral belt is comprised of at least one layer constructed with a combination of two different cords each having an initial tension of not less than 50 cN/cord.

Description

[0001] 1. Field of the Invention[0002] This invention relates to a pneumatic tire having an improved steering stability and a method of producing such a pneumatic tire, and more particularly to a front tire and a rear tire for a motorcycle and a method of producing the same.[0003] 2. Description of Related Art[0004] In the conventional front and rear tires as a tire for a motorcycle or the like, a spiral belt formed by spirally winding a cord(s) on an outer circumference of a carcass is recently used as a belt structure. In this case, the belt is constructed by one kind of the cord. In general, there are known a spiral belt comprised of only a steel cord, a spiral belt comprised of only a reinforcing fiber cord made of a resin material or the like.[0005] In the spiral belt comprised of only the steel cord, the rigidity becomes too high and hence it is difficult to highly maintain the ride comfort and the slip resistance. For this end, it is attempted to reduce an end count as the wi...

Claims

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Application Information

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IPC IPC(8): B29D30/70B60C9/20B60C9/00B60C9/18B60C9/22
CPCB60C9/2204B29D30/1628Y10T152/10783B60C2009/2029B29D30/70B60C2200/10B60C2009/2209
Inventor NAKAMURA, TSUTOMU
Owner BRIDGESTONE CORP
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