Pneumatic tire

A technology for pneumatic tires and tires, applied to the reinforcement layer of pneumatic tires, tire parts, wheels, etc., can solve the problem that the reverse "V" bending deformation cannot be fully suppressed, and achieve the effect of preventing bending phenomena

Inactive Publication Date: 2009-03-11
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in general studless tires, when the tread rubber has a bulk modulus of less than 4 Gpa, the above-mentioned reverse "V" bending deformation cannot be sufficiently suppressed, and thus the pressure inside the tire is reduced to At 10kPa, it is impossible for it to run another 200km

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] 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 dimensions are shown in Table 1, wherein the rubber reinforcement layer made of low-loss, high-rigidity rubber has the largest The thickness is 8mm, the two-layer cover is 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 18×8JJ Rigid ring (rim), and when the inflation pressure is 230kPa or 0kPa, test its driving stability on icy roads and the amount of tread rise when the internal pressure is reduced, or when the internal pressure of the tire is 0kPa and the load is 4.81 When kN and speed are 89km / h, the run-flat durability of running 200km without any problem is tested. The test results are shown in Table 1.

[0045] In Table 1, the bulk modulus of the tread rubber is calculated from the relationship ...

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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, and more particularly to studless tires, and more particularly to a technique for preventing separation failure or breakage by suppressing the movement of treads running under relatively low internal pressure. Bending (buckling) to achieve. Background technique [0002] If a nail or other sharp object penetrates the tread while the tire is running under a load, the internal pressure will gradually decrease, and the tread will bend, thus causing peeling of the tread rubber due to belt separation, and belt ply rupture, etc., and there is a risk of explosion or other similar hazards. [0003] Here, when the tire runs on a road surface with a low coefficient of friction (such as old asphalt road, stone pavement, etc.) under a very low internal pressure state, the bending of the tread is significant. In the present invention, as shown in an exaggerated manner in the transverse section of Figure 1a, when th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/18B60C9/22B60C17/00B60C11/00
CPCB60C11/00B60C9/2009B60C17/0009B60C17/00Y10T152/10792
Inventor 河野好秀黑川真
Owner BRIDGESTONE CORP
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