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Tire/wheel assembly

An assembly and tire technology, which is applied to tire parts, treads, vehicle parts, etc., can solve problems such as the deterioration of rim assembly, and achieve the effect of improving the durability of flat running

Inactive Publication Date: 2005-08-31
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the inner diameter of the support body for running flat is the same as the inner diameter of the bead (tire bead) portion of the pneumatic tire, the outer diameter is formed to be larger than the inner diameter of the bead portion. Inserts into the inside of the pneumatic tire
Therefore, even if it is desired to increase the run-flat durability by simply increasing the outer diameter of the support body for run-flat, the increase in the outer diameter has certain restrictions due to the deterioration of the rim assemblability.
[0005] That is, in the conventional run-flat support body, its outer diameter is limited to about 45% of the cross-sectional height SH of the pneumatic tire according to the size of the cross-sectional height A. If the outer diameter is further increased beyond this level, it will cause Deterioration of rim assembly and therefore not adopted
Therefore, there is a limit to improving the run-flat durability by increasing the outer diameter of the support body for run-flat.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] As a common point, the tire size and rim size are set to 205 / 55R16 and 16×61 / 2JJ, respectively, and the ratio of the section height A of the run-flat support body to the tire section height SH and the cross-sectional area of ​​the bead core are prepared. Seven different tire / wheel assemblies (conventional examples, comparative examples 1 and 2, and examples 1 to 4) were shown in Table 1.

[0034] For these seven types of tire / wheel assemblies, the ease of insertion operation (insertion operability) of the support body for pneumatic tire and the run-flat durability of the support body obtained by the following measurement method were measured , and the results are shown in Table 1.

[0035] Run-flat durability

[0036] The tire pressure is set to 0, and the test tire / wheel assembly is installed on the left side of the front wheel of a passenger car with a displacement of 2500cc. The distance traveled on the road until the support body for running flat is damaged. Th...

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PUM

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Abstract

A tire / wheel assembly, wherein a run-flat support body ( 3 ), comprising an annular shell ( 4 ) having an outer peripheral side as a support surface and an inner peripheral side formed in fork-shaped open legs and elastic rings ( 5 ) supporting the ends of the legs on a rim, is inserted into a hollow part of a pneumatic tire ( 2 ), and wherein the height (A) of the run-flat support body ( 3 ) in the cross section thereof is 50 to 60% of the height (SH) of the pneumatic tire ( 2 ) in the cross section thereof, and wherein the cross sectional area of the bead cores ( 7 ) of the pneumatic tire ( 2 ) is 25 to 40 mm2.

Description

technical field [0001] The present invention relates to a tire / wheel assembly, and more specifically, to a tire / wheel assembly capable of improving run-flat durability without impairing rim assembly. Background technique [0002] Due to market demands, various technologies have been proposed that enable emergency driving of several hundreds of kilometers even when a pneumatic tire is punctured while the vehicle is running. Among the various proposals mentioned above, the techniques proposed in JP-A-10-297226 and JP-A-2001-519279 are to assemble a core body on the rim inside the cavity of a pneumatic tire assembled on the rim, which can A technology that realizes run-flats by supporting a punctured tire with this core. [0003] The run-flat core body (support body) is mounted on both legs by a ring-shaped case having a fork structure (fork leg structure) in which the inner peripheral side is bifurcated while the outer peripheral side is used as a supporting surface. It cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/06B60C15/04B60C17/04
CPCB60C17/06B60C17/043B60C17/04B60C15/04B60C17/00
Inventor 志村一浩关口巧内藤充
Owner THE YOKOHAMA RUBBER CO LTD