Pneumatic radial tires with rubber filler composed of three rubb

Details Pneumatic radial tires with rubber filler composed of three rubb Pneumatic radial tires with rubber filler composed of three rubb

1997-09-02

1999-03-02

Johnstone, Adrienne

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152547, 152564, B60C 1506, B60C 1500

Patent

active

058765271

ABSTRACT:
A pneumatic radial tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass of at least one rubberized ply containing cords arranged in a radial direction and consisting of a main carcass body and a turnup portion. A belt is superimposed about a crown portion of the carcass, and a rubber filler is arranged between the main carcass body and the turnup portion above the bead core. The rubber filler is composed of three different rubber stocks, and a hardest rubber stock among these rubber stocks is arranged in at least an outer zone in the radial direction of the tire sandwiching a normal line drawn from the turnup end to the outer surface of the main carcass body at a cross section of the tire and perpendicular to the main carcass body. A rubber stock having a middle hardness is arranged between the outer surface of the main carcass body and the hardest rubber stock as a stress-mitigating rubber layer. A softest rubber stock is arranged along an inner surface of the turnup portion.

REFERENCES:
patent: 5056575 (1991-10-01), Yamaguchi et al.
patent: 5626698 (1997-05-01), Tsuruda et al.
patent: 5669994 (1997-09-01), Tsuruta
patent: 5725702 (1998-03-01), Nakamura et al.
European Search Report, dated Dec. 15, 1997.

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