Pneumatic run flat tire

A pneumatic tire and run-flat technology, which is applied to special tires, tire parts, tire tread/tread pattern, etc., can solve the problems of insufficient ride comfort effect, improve ride comfort, maintain lack of Durability for air retention and damage prevention effect

Active Publication Date: 2012-07-11
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these proposals are generally effective in improving ride comfort during driving and / or reducing tire weight, and there is still room for improvement.

Method used

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  • Pneumatic run flat tire
  • Pneumatic run flat tire
  • Pneumatic run flat tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Ten types of conventional examples, comparative examples 1 to 4, and examples 1 to 5 were produced with the tire size set to 255 / 40RF19, and the specifications of the tire cross-sectional shape, bead filler, and reinforcing rubber layer as shown in Table 1. tire.

[0039] The conventional example is an example in which the angle θ and the height of the bead filler are smaller and the height of the reinforcing rubber layer is larger than the predetermined range of the present invention. Comparative Examples 1 and 2 are examples in which the height of the bead filler deviates from the range of the present invention. Comparative Example 3 is an example in which the height of the reinforcing rubber layer deviates from the range of the present invention. Comparative Example 4 is an example in which the angle θ deviates from the range of the present invention.

[0040] Examples 1 to 5 are all examples in which the cross-sectional shape of the tire is within the predetermine...

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PUM

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Abstract

The invention provides a pneumatic run flat tire in which tire weight can be reduced while maintaining run-flat durability, and which is configured so that riding comfort when regular traveling is enhanced. The pneumatic run flat tire is provided with a reinforcing rubber layer (7) having a falcate cross-section disposed on an inner side of a side wall portion (2) in a tire width direction of the carcass layer (4). An angle [theta], with respect to the total tire width (SW) and a tire cross-section height (SH), satisfies a relationship (SH / SW*6+3) <DEG> <=[theta]<=(SH / SW6+8) <DEG>. Additionally, a height (H1) of bead filler (6) is from 30 to 50% of the tire cross-section height SH and a height (H2) of a maximum thickness position of the reinforcing rubber layer is from 35 to 55% of the tire cross-section height SH.

Description

technical field [0001] The present invention relates to a run-flat pneumatic tire, and more specifically, to a run-flat pneumatic tire capable of reducing tire weight while maintaining run-flat durability, and improving ride comfort during normal driving. Background technique [0002] Generally, in a run-flat tire in which a reinforcing rubber layer having a crescent-shaped cross section is disposed on the inner side of the sidewall, the reinforcing rubber layer is thickened and / or rubber with higher hardness is used for the reinforcing rubber layer. , to ensure durability during run-flat use. However, such a tire having improved run-flat durability has problems in that rolling resistance increases due to an increase in weight and / or ride quality deteriorates during normal running due to an increase in sidewall rigidity. [0003] Conventionally, there have been proposals to use special rubber for the material of the reinforcing rubber layer and / or to incorporate short fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C13/00B60C17/00
CPCB60C15/00B60C3/04B60C13/00B60C15/0603B60C11/00B60C17/0009B60C2017/0063B60C17/00B60C15/06B60C3/00Y10T152/10846Y10T152/10837
Inventor 新泽达朗
Owner THE YOKOHAMA RUBBER CO LTD
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