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Run-flat tire

A run-flat and tire technology, applied in the reinforcement layer of pneumatic tires, special tires, tire parts, etc., can solve problems such as damage to run-flat tires, and achieve the effect of improving durability

Inactive Publication Date: 2012-05-23
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Run-flat tires can eventually be destroyed due to thermal degradation when driven beyond the limit

Method used

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  • Run-flat tire
  • Run-flat tire
  • Run-flat tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0106] exist figure 1 , each having a basic tire structure by manufacturing samples based on the specifications shown in Table 1—except figure 1 Run-flat tires differing only in the heat-conducting rubber except and only in the heat-conducting rubber, and these properties are compared with each other. For comparison, in Figure 8 On the run-flat tire shown in (a) without heat-conducting rubber (Comparative Example 1) and on Figure 8The same test was carried out on the run-flat tire (Comparative Example 2) shown in (b) having heat-conducting rubber outside the projected area of ​​the side reinforcing rubber layer.

[0107] Tire size: 245 / 40R18

[0108] Rim size: 18×8.5Js

[0109] Each compound of thermally conductive rubber is shown in Table 2. details as follows:

[0110] Natural rubber (NR): RSS#3;

[0111] Styrene-butadiene rubber (SBR): SBR1502 manufactured by Sumitomo Chemical Company, Limited;

[0112] Butadiene rubber (BR): BR150B produced by Ube Industries, Ltd...

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PUM

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Abstract

Disclosed is a run-flat tire having greatly increased run-flat endurance. The disclosed run-flat tire is provided with: a carcass (6) going from a tread section (2) through a sidewall section (3) to a bead core (5) of a bead section (4); and a side-reinforcement rubber layer (9) that has a crescent-shaped cross-section and is disposed inside the carcass (6) in the sidewall section (3). A heat-conducting rubber (11) having a coefficient of thermal conductivity of at least 0.3 W / (mK) is distributed on the inner surface (12) of the tire. At least part of said heat-conducting rubber (11) is distributed in a side-reinforcement rubber layer projection area (T), consisting of the projection of the side-reinforcement rubber layer (9) onto the inner surface (12) of the tire.

Description

technical field [0001] The present invention relates to a run-flat tire capable of remarkably improving run-flat durability. Background technique [0002] Recently, there are known side-reinforced run-flat tires in which a side-reinforcing rubber layer having a substantially crescent cross-sectional shape is provided in a sidewall portion. In such a run-flat tire, for example, when the tire is punctured, the side reinforcing rubber layer replaces the air pressure to support the tire load, and it is possible to continuously travel a certain distance at a speed of 60 km / h to 80 km / h (hereinafter, Such driving may be referred to as "run-flat driving"). [0003] However, even though it is a run-flat tire, heat is generated in the side reinforcing rubber layer depending on the running distance during run-flat running. Run-flat tires eventually fail due to thermal degradation when driven beyond their limits. In order to delay the destruction of the side reinforcing rubber layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/00B60C1/00
CPCB60C9/14B60C17/0009B60C15/024B60C13/02B60C17/00B60C5/14B60C2015/0614B60C13/004B60C2017/0054B60C2017/0072B60C2013/005
Inventor 日野秀彦半谷正裕
Owner SUMITOMO RUBBER IND LTD