Pneumatic radial tire having inner carcass ply cord tension smal

Details Pneumatic radial tire having inner carcass ply cord tension smal Pneumatic radial tire having inner carcass ply cord tension smal

1997-04-15

1999-08-17

Johnstone, Adrienne C.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152454, 152543, 152547, 152552, 152553, 152554, 152556, 152557, 156123, B60C 902, B60C 908, B60C 1500

Patent

active

059388706

ABSTRACT:
A pneumatic radial tire comprises a carcass comprising an outer carcass ply made of cords having a first heat-shrinkage-percentage K1 and an inner carcass ply is made of cords having a second heat-shrinkage-percentage K2 different from the first heat-shrinkage-percentage K1, and the cord tension of the inner carcass ply is smaller than the cord tension of the outer carcass ply. A method of making the tire comprises steps of making the outer carcass ply of cords having a first heat-shrinkage-percentage K1, making the inner carcass ply of cords having a second heat-shrinkage-percentage K2, wherein the first heat-shrinkage-percentage K1 at 150 degrees C. is 120 to 160% of the second heat-shrinkage-percentage K2 at 150 degrees C., and heating and vulcanizing a raw tire to heat-shrink the outer carcass ply cords in a larger degree than the inner carcass ply.

REFERENCES:
patent: 3245454 (1966-04-01), Lewis
patent: 3500888 (1970-03-01), Boileau
patent: 3709277 (1973-01-01), Montagne
patent: 4378041 (1983-03-01), Tsurunaga et al.
patent: 4972893 (1990-11-01), Komai et al.
patent: 5526863 (1996-06-01), Hodges
Patent Abstracts of Japan, vol. 016, No. 331 (M-1282) Jul. 20, 1992 & JP-A-04 095502 (Bridgestone Corp.) Mar. 27, 1992.
Patent Abstracts of Japan, vol. 13, No. 432 (M-874) Sep. 27, 1989 & JP-A-01 164603 (Ohtsu Tire & Rubber Co. Ltd.) Jun. 28, 1989.

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