Heavy duty pneumatic radial tires with at least three bead porti

Details Heavy duty pneumatic radial tires with at least three bead porti Heavy duty pneumatic radial tires with at least three bead porti

1997-07-07

1999-11-09

Johnstone, Adrienne C.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152539, 152543, 152546, 152547, B60C 1300, B60C 1500, B60C 1506

Patent

active

059795271

ABSTRACT:
A heavy duty pneumatic radial tire comprises a pair of bead portions, a pair of sidewall portions, a tread portion, a radial carcass ply and a belt, in which at least three rubber layers having different hardnesses exist in a zone ranging from the cords in a turnup portion of the carcass ply to an axially outer portion of the bead portion throughout a region of the bead portion corresponding to a line drawn normal to the axially outer portion of the bead portion in a contact area increased portion of the bead portion sandwiched between two contact end positions of an axial outside surface of the bead portion on a flange of a design rim as measured under particular conditions, and the at least three rubber layers are comprised of a coating rubber of the carcass ply and a softest rubber layer and a hardest rubber layer, and the softest rubber layer and hardest rubber layer have particular values of 100% modulus.

REFERENCES:
patent: 4019551 (1977-04-01), Kolowski et al.
patent: 4941523 (1990-07-01), Galante et al.
patent: 5048584 (1991-09-01), Nakano et al.
patent: 5196077 (1993-03-01), Kaga
patent: 5236031 (1993-08-01), Honbo et al.
Patent Abstracts of Japan, vol. 017, No. 123 (M-1380), Mar. 15, 1993 & JP 04 306108 A, Oct. 28, 1992 (Abstract).
Abstract of JP-A-3-42310, Feb. 22, 1991, Japan (Bridgestone Corp).
Abstract of JP-A-7-137507, May 30, 1995, Japan (Bridgestone Corp).
Abstract of JP-A-7-144517, Jun. 6, 1995, Japan (Bridgestone Corp.).

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