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Run flat tire

A run-flat and tire technology, applied in tire parts, tire rims, vehicle parts, etc., can solve problems such as damage, and achieve the effects of inhibiting damage, improving durability, and inhibiting deformation

Active Publication Date: 2019-09-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when the above-mentioned run-flat tire passes over a curb or a pothole, excessive tension is momentarily generated in the carcass, which may damage the carcass called a pinch cut.

Method used

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Examples

Experimental program
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Embodiment Construction

[0022] Hereinafter, one embodiment of the present invention will be described based on the drawings.

[0023] figure 1 A tire meridian cross-sectional view including the rotation axis in a normal state of the run-flat tire 1 according to the present embodiment is shown.

[0024] "Normal state" refers to a no-load state in which a tire is assembled to a regular rim and filled with a regular internal pressure. Hereinafter, unless otherwise mentioned, the dimensions and the like of each part of the tire are values ​​measured in this regular state.

[0025] "Regular rim" refers to the rim that specifies the specification for each tire in the specification system including the specification on which the tire is based. For example, if it is JATMA, it is "standard rim", and if it is TRA, it is "Design Rim ", if it is ETRTO, it will be "Measuring Rim".

[0026] "Regular internal pressure" refers to the air pressure of each specification for each tire in the specification system inc...

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PUM

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Abstract

Provided is a run flat tire capable of inhibiting damage by reducing tensile force in a carcass when overrunning a pothole or the like. A run flat tire 1 includes: first bead apex rubbers 8A extending from bead cores 5 outward in a tire radial direction; second bead apex rubbers 8B disposed outward of the first bead apex rubbers 8A in a tire axial direction; and first and second carcass plies 6A and 6B. The first carcass ply 6A includes a body portion 6a and turned-up portions 6b. The second carcass ply 6B includes a body portion 6c and turned-up portions 6d. The turned-up portion 6b extends in the tire radial direction through an outer side, in the tire axial direction, of the second bead apex rubber 8B. The turned-up portion 6d extends in the tire radial direction through between the first and second bead apex rubbers 8A and 8B.

Description

technical field [0001] The present invention relates to a run-flat tire capable of running in a flat state. Background technique [0002] Conventionally, there is known a run-flat tire in which a side reinforcing rubber layer having a substantially crescent-shaped cross-section is disposed on a sidewall portion inside a carcass. [0003] For example, Patent Document 1 discloses a run-flat tire in which a first apex is disposed axially inside the folded portion of the carcass and a second apex is disposed axially outside the folded portion of the carcass. . [0004] Patent Document 1: Japanese Patent No. 2015-098198 [0005] However, when the above-mentioned run-flat tire passes over a curb or a pothole, excessive tension is momentarily generated in the carcass, which may cause damage to the carcass called a pinch cut. Contents of the invention [0006] The present invention has been made in view of the above circumstances, and its main object is to provide a run-flat ti...

Claims

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Application Information

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IPC IPC(8): B60C15/06B60C15/00
CPCB60C15/06B60C15/0009B60C15/0045B60C15/0607B60C17/0009B60C2015/0621
Inventor 青木知荣子
Owner SUMITOMO RUBBER IND LTD