PNEUMATIC RADIAL TIRE PROVIDED WITH SIDE REINFORCING LAYER

Japanese Patent JP3131170

B2

PROBLEM TO BE SOLVED: To improve the durability of a pneumatic radial tire when a vehicle runs while the tire was punctured without worsening the steering stable performance and riding comfortableness performance by providing a crescent-shaped side reinforcing layer over a whole region of both side parts along an inner face of a carcass ply and setting the thickness of a cross section of a specific section of this side reinforcing layer to the maximum value.
SOLUTION: A run flat tire has a carcass ply 2 which is wound around a bead core 1 and is moored to a bead part. In this case, a crescent-shaped side reinforcing layer 5 is provided over a whole region of both side parts along an inner face of the carcass ply 2. The thickness of a cross section of the side reinforcing layer 5 in the vicinity of 1/3 point C on an outer side in the radial direction when periphery of an inner side of the tire of the side reinforcing layer 5 is divided into three equal parts is set to the maximum value. Furthermore, it is preferable that the thickness T of the cross section of the side reinforcing layer 5 at 1/3 point C is 1.8 to 2.8 times the thickness t of a cross section of the side reinforcing layer 5 at l/3 point B on an inner side in the radial direction. Consequently, if is possible to improve the durability of the tire when a vehicle runs while the tire is punctured.

JPS6029703	[Title of the device] Tire
JPH0218107	PNEUMATIC RADIAL TYRE EXCELLENT IN BEAD PART DURABILITY
JP2015147511	PNEUMATIC TIRE

Hiroshi Nishigata

JP11266997A

January 31, 2001

April 30, 1997

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Bridgestone Corporation

B60C13/00; B60C9/02; B60C9/18; B60C17/00; (IPC1-7): B60C17/00; B60C13/00

JP53138106A
JP5231404A
JP6219112A
JP59206211A
JP5016202A

Akihide Sugimura (8 outside)

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