RUN-FLAT TIRE - TOYO TIRE & RUBBER CO

Title:

RUN-FLAT TIRE

Document Type and Number:

WIPO Patent Application WO/2006/085450

Kind Code:

A1

Abstract:

A run-flat tire in which tire mass and rolling resistance can be reduced and riding comfortableness can be enhanced while bead separation performance and partial-abrasion resistant performance are sustained. The run-flat tire comprises reinforce rubber layers (9a, 9b) arranged at the sidewall portion, characterized in that an annular inflating portion (10) provided on the outside in the tire width direction of a bead (1) arranged on the outside of a vehicle and having an inner circumferential side face (11) opposing the outer circumferential curved side face of a rim flange when a regular rim is fixed, and an annular second bead (1b) arranged at the annular inflating portion (10) are provided, the reinforce rubber layer (9a) being arranged on the outside of the vehicle has rubber hardness of 60-82°, the reinforce rubber layer (9b) being arranged on the inside of the vehicle has rubber hardness of 65-90°, and the reinforce rubber layer (9b) being arranged on the inside of the vehicle has rubber hardness equal to or higher than that of the reinforce rubber layer being arranged on the outside of the vehicle and has a maximum thickness of 0.5 mm or larger.

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Inventors:

SEGAWA MASAHIRO (JP)
HANA KAZUTAKA (JP)

Application Number:

PCT/JP2006/301500

Publication Date:

August 17, 2006

Filing Date:

January 31, 2006

Export Citation:

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Assignee:

TOYO TIRE & RUBBER CO (JP)
SEGAWA MASAHIRO (JP)
HANA KAZUTAKA (JP)

International Classes:

B60C17/00; B60C11/00; B60C11/03; B60C15/02

Foreign References:

JPS5579707A	1980-06-16
JPS53138106A	1978-12-02
JPS51116507A	1976-10-14
JPH10138719A	1998-05-26
JP2003326917A	2003-11-19

Other References: