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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: 2016-11-30
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] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0028] figure 1 is a cross-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 delimited by the tire meridian plane CL is shown. The other half has the same structure as the half shown and is therefore omitted. figure 1 Indicates a run-flat tire in a standard condition where the run-flat tire is mounted on a usable rim and inflated to the specified internal pressure with no applied load.

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

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Abstract

This run-flat tire is provided with: a carcass that extends toroidally between a pair of bead portions; and a side reinforcing rubber on the inside of the carcass in the width direction of the tire, the side reinforcing rubber having a crescent-shaped cross-section in the width direction of the tire. The relational expressions 0.09 <= TWH / TW <= 0.19, D / SH <= 0.05, and 0.89 <= TW / SW <= 0.94 are satisfied in a reference state where the run-flat tire is mounted to an application rim, filled with a predetermined internal pressure, and kept under no-load conditions, where TW(mm) represents the half-width in the width direction of the tire between a pair of tread ends, TWH(mm) represents the drop height of the tread ends in the radial direction of the tire, SW(mm) represents the half-width of the maximum width of the tire, SH(mm) represents the height of the cross section of the tire, and D(mm) represents the drop height of the tire at a point 0.65 SW(mm) outwardly away from the tire equatorial plane in the width direction of the tire.

Description

technical field [0001] The present disclosure relates to a run-flat tire having a side reinforcement rubber in a side portion thereof, the side reinforcement rubber having a crescent-shaped cross-sectional shape along the tire width direction. Background technique [0002] In a run-flat tire, the run-flat tire has a side reinforcement rubber in its side portion, and the side reinforcement rubber has a crescent cross-sectional shape in the tire width direction, that is, a side-reinforced run-flat tire In running tires, it is known that because the side reinforcement rubber is provided in the tire side, the vertical spring constant of the tire increases, thereby reducing driving comfort. [0003] JP 2007-069775 A (PTL 1) discloses that by using an extremely round outer contour shape for the tread, the rubber volume of the side reinforcement rubber can be reduced, thereby maintaining the increase in tire mass and the reduction in driving comfort It should be smaller, and at th...

Claims

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Application Information

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Patent Type & Authority Applications(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