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run flat tire

A tire and tire width direction technology, applied to the reinforcement layer of pneumatic tires, special tires, tire parts, etc., can solve the problems of reducing driving comfort and increasing the vertical elastic constant of tires.

Active Publication Date: 2018-01-26
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the run-flat tire, the run-flat tire has side reinforcing rubber in its side portion, and the side reinforcing rubber has a crescent-shaped sectional shape in the tire width direction, that is, in the side-reinforcing type run-flat tire In running tires, it is known that since the side reinforcing rubber is provided in the side portion of the tire, the vertical spring constant of the tire is increased, thereby reducing driving comfort

Method used

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Examples

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Embodiment Construction

[0027] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0028] figure 1 is a sectional view in the tire width direction of a run flat tire according to one embodiment of the present disclosure. figure 1 Only one half bounded by the tire meridian plane CL is shown. The other half has the same structure as the half shown in the figure and is therefore omitted. figure 1 Indicates a run-flat tire in a standard state in which the run-flat tire is mounted on a serviceable rim and inflated to a specified internal pressure without applying a load.

[0029] like figure 1 As shown, the run-flat tire of this embodiment (hereinafter also simply referred to as tire) is provided with a carcass 2, and the carcass 2 is composed of a carcass main part 2a and a carcass folded part 2b, wherein the carcass main part 2a is A plurality of bead portions 1 in which a pair of bead core portions 1a (only one of which is shown) are em...

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Abstract

A run-flat tire includes: a carcass extending annularly between a pair of bead portions; and a side reinforcing rubber located on the inner side of the carcass in the tire width direction, the side reinforcing rubber having in the tire width direction Crescent section shape. The relationships 0.09≤TWH / TW≤0.19, D / SH≤0.05, and 0.89≤TW / SW≤0.94 are satisfied, where the run-flat tire is mounted on a usable rim and inflated to a In the reference state under the specified internal pressure, TW (mm) represents the half width in the tire width direction between a pair of tread edges, and TWH (mm) represents the drop of the tread edge in the tire radial direction, SW (mm) ) represents half of the tire maximum width, SH (mm) represents the cross-sectional height of the tire, and D (mm) represents the drop of the tire at a position of 0.6SW (mm) outward from the tire meridian in the tire width direction.

Description

technical field [0001] The present disclosure relates to a run-flat tire having, in its side portion, side reinforcing rubber having a crescent cross-sectional shape in the tire width direction. Background technique [0002] In the run-flat tire, the run-flat tire has side reinforcing rubber in its side portion, and the side reinforcing rubber has a crescent-shaped sectional shape in the tire width direction, that is, in the side-reinforcing type run-flat tire In the running tire, it is known that since the side reinforcing rubber is provided in the side portion of the tire, the vertical elastic constant of the tire is increased, thereby deteriorating the driving comfort. [0003] JP 2007-069775 A (PTL 1) discloses that by using an extremely round outer profile shape for the tread, the rubber volume of the side reinforcing rubber can be reduced, thereby maintaining the increase in tire mass and the decrease in driving comfort It is smaller, and at the same time, the ability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C17/00B60C9/08B60C11/00
CPCB60C9/08B60C11/00B60C17/00B60C11/0083B60C3/04B60C2009/145Y02T10/86B60C17/0009B60C2017/0054
Inventor 牧野真拓
Owner BRIDGESTONE CORP