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Run flat tire and method of manufacturing the tire

A runflat and tire technology, which is applied to the reinforcement layer of pneumatic tires, tire parts, tires, etc., can solve the problems that the carcass cords cannot be effectively prevented from peeling off, etc.

Inactive Publication Date: 2008-10-22
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this tire has a problem that the overlapping portion of the cords constituting the carcass ply is located between the beads, so that the tire cannot effectively prevent the peeling of the carcass cords.

Method used

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  • Run flat tire and method of manufacturing the tire
  • Run flat tire and method of manufacturing the tire
  • Run flat tire and method of manufacturing the tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. figure 1 is a partially exploded perspective view of a typical embodiment of a runflat tire according to the present invention, figure 2 for figure 1 A cross-sectional view of the bead portion 5 of the run-flat tire shown in .

[0042] figure 1 and 2 The run-flat tire (hereinafter referred to as “tire”) N shown in has a carcass 4 provided on the outside of a carcass inner liner 1 and composed of a layer 3 of cords 2 . The carcass 4 extends annularly over a pair of bead portions 5 , a pair of sidewall portions 6 and a tread portion 7 . A reinforcing rubber layer 8 having a crescent cross-sectional shape is provided on the inner surface side of the side wall portion 6 with respect to the carcass 4 . On the periphery of the crown portion of the carcass 4 is provided a belt 10 formed by laminating a plurality of cords 9 aligned in parallel and coated with...

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PUM

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Abstract

The present invention is to provide a runflat tire which can effectively inhibit both of pulling out of carcass cords and coming off of beads during running in the runflat state. <??>A runflat tire according to the present invention comprises a carcass 4 toroidally extending over a pair of beads 5, a pair of sidewall portions 6 and a tread portion 7, and a reinforcing rubber layer 8 which has a crescent sectional shape and is arranged at the interior surface side of the carcass 4. The carcass 4 comprises at least one cord layers 3 including radial cord portions 15, which are radially-arrayed at a circumferential pitch P, and circumferential cord portions 16, which circumferentially connect respective inner ends of adjacent radial cord portion 15.

Description

technical field [0001] The present invention relates to a run-flat tire capable of running for a certain distance even in a state in which the internal pressure thereof has excessively decreased or the tire has been punctured. In particular, the present invention aims at significantly improving tire uniformity and effectively suppressing peeling of carcass cords and falling off of beads during running in a run-flat state. Background technique [0002] As a so-called run-flat tire capable of running a certain distance even when its internal pressure is abnormally lowered or it has been punctured, there are two types of tires, namely, so-called core-type run-flat tires and So-called side-reinforced run-flat tires. The former comprise a support in the tire / rim assembly, while the latter have a reinforcing rubber layer consisting of relatively soft rubber and arranged on the inner surface of the carcass, at least in the sidewall sections. [0003] Due to the material stiffness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D30/10B60C17/00B60C15/06B60C9/02B60C9/09B60C15/00
CPCB60C17/0009B60C15/06B60C9/023B60C15/0018B60C9/09B60C17/00Y10T152/10819
Inventor 小川裕一郎
Owner BRIDGESTONE CORP