Pneumatic tire

A technology of pneumatic tires and tires, which is applied to the reinforcement layers, tire parts, wheels, etc. of pneumatic tires to prevent the phenomenon of folding in.

Inactive Publication Date: 2004-07-21
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, when the tread rubber has an elastic volume modulus of less than 4 GPa, which is generally used for studless tires, the above-mentioned reverse "V"-

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The size of each tire in the embodiment and the comparative example is 245 / 40R18, and has the structure shown in Figure 2, and the size is shown in Table 1, wherein the largest rubber reinforcement layer made of low-damage, high-rigidity rubber is used The thickness is 8mm, the two layers of the hat are made of nylon fiber rope, the width of the inner belt layer is 200mm, the width of the outer belt layer is 190mm, and the width of the additional belt layer is 180mm, they are installed in a rim of 18×8JJ , inflated to an air pressure of 230kPa or 0kPa. As for the driving stability on icy roads, no matter whether it has run to 200km or not, when the internal pressure is reduced, the lift of the tire surface and the durability of running smoothly can be achieved without problems. When the internal pressure of the tire is 0kPa and the load is 4.81 When kN and speed are 89km / h, the test results are shown in Table 1.

[0044] In Table 1, the elastic volume coefficient of th...

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PUM

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Abstract

It is to provide a pneumatic tire in which a bulk modulus of elasticity of a tread rubber is small and an inverse V-shaped bending in a tread portion is suppressed to effectively prevent separation failure, breakage and the like of a belt layer, which comprises a radial carcass, a belt of two belt layers with a cross cord arrangement reinforcing a tread portion at an outer peripheral side of a crown portion of the radial carcass and a rubber reinforcing layer having a crescent-shaped form at a cross section, wherein the tread rubber forming a ground contact face of the tread is made of rubber having a bulk modulus of elasticity of not more than 4 GPa and an additional belt layer of cords having a cord angle with respect to an equatorial plane of the tire larger than that of cords in each of belt layers is arranged on an outer peripheral side of the belt and a compression rigidity of the additional belt layer in a widthwise direction of the tread is made 2 times or more larger than that of the belt layer.

Description

technical field [0001] The present invention relates to pneumatic tires, particularly studless tires, and more particularly to a technique for preventing separation failure or breakage by suppressing buckling of tire treads running under relatively low internal pressure. Into (buckling) to achieve. Background technique [0002] If the tire is driven through the tread by nails or other sharp objects, its internal pressure will gradually decrease, and the folding of the tire tread will cause the separation failure of the belt layer, which will cause serious damage due to the peeling of the tire tread rubber. Explosion or similar hazards, belt damage, etc. [0003] In particular, when the tire is run on a road with a low coefficient of friction (such as old asphalt roads, stone paved roads, etc. with low surface roughness) under a very low internal pressure state, the buckling of the tire tread is significant. In the present invention, as shown in Fig. 1a transverse cross-sec...

Claims

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Application Information

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IPC IPC(8): B60C11/00B60C17/00
CPCB60C11/00B60C9/2009B60C17/0009B60C17/00Y10T152/10792
Inventor 河野好秀黑川真
Owner BRIDGESTONE CORP
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