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Pneumatic tire

A technology for pneumatic tires and tire radius, which is applied to the reinforcement layer of pneumatic tires, tire parts, transportation and packaging, etc., which can solve the problems of poor handling stability and reduced sideslip force, so as to reduce deviation and improve The effect of handling stability

Inactive Publication Date: 2009-07-29
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when the slip angle is large, the sideslip force decreases, and there is a problem that the steering stability deteriorates

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] Evaluation was performed after manufacturing the tires of the examples of the present invention and the tires of conventional examples and comparative examples. The tires of Examples and Comparative Examples are tires having different tensile modulus in the tire width direction, and the tire of Conventional Example has a tensile modulus of 450 N per inch of the belt reinforcement layer, and a width equal to the width W of the belt layer. 104%. Each tire was sized 225 / 45R17 and evaluated at an air pressure of 220 kPa after being mounted on a rim of size 17×8-JJ.

[0024] The tires of Examples, Conventional Examples, and Comparative Examples included belt reinforcing layers having the tensile modulus shown in Table 1. In the examples and comparative examples, the materials of the reinforcing cords were selected, and the number of reinforcing cords per inch was appropriately changed to change the tensile modulus Ma, Mb, and Mc of each region. In addition, the tensile mod...

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Abstract

The present invention provides a pneumatic tire, capable of improving performance on a road surface with snow, and non reducing drive performance on a dry road surface. In the pneumatic tire, W is the width of the belt layer (5a) in the innermost side in the tire radius direction. A is the region of the belt reinforcing layer (11) which is the region at the both sides of the tire equator plane in the tire width direction. B is the region in the outer side of the region A in the tire width direction. C is the region that is further outer side of the region B. Ma, Mb and Mc are tensile modulus per inch (25.4 mm) of the region A, B and C respectively. The width Wa of the region A is 2 to 10% of W, the width Wb of the region B is 15 to 40% of W, Mc is 350 to 2000N, Ma is 100 to 400% of Mc, Mb is 200 to 800% of Mc, and Mb is larger than Ma.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire in which steering stability is improved by changing the tensile modulus of a belt reinforcement layer in the tire width direction. Background technique [0002] There is a pneumatic tire, in order to increase the tire deflection rigidity and improve the steering stability, a belt reinforcement layer reinforced by driving reinforcing cords (made of organic fiber or steel) is arranged on the outer side of the belt layer in the tire radial direction (Refer to Patent Document 1). In such a tire, the number of the belt reinforcing layer composed of reinforcing cords having a large tensile modulus and the reinforcing cords per unit width is large. [0003] Patent Document 1: Japanese Patent Laid-Open No. 1-278802 [0004] In the above pneumatic tire, when the tire deflection stiffness is increased, the tension acting on the belt reinforcing layer increases, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/18B60C9/28
CPCB60C9/22
Inventor 上田隆一田中嘉宏
Owner TOYO TIRE & RUBBER CO LTD