Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1991-04-12
1993-03-30
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152525, 152531, 152533, 152546, 152554, B60C 922, B60C 924, B60C 1300, B60C 1304
Patent
active
051980517
ABSTRACT:
A radial tire for motorcycles which comprises: at least one ply of radially arranged organic fiber cords turned up around the bead cores to form two turned up portions and a main portion therebetween; a tread disposed radially outside the carcass to define the tread portion; sidewalls disposed axially outside the carcass to define the sidewall portions; a belt disposed radially outside the carcass and inside the tread; a bead apex disposed between the carcass main portion and each carcass turned up portion and extending radially outwardly and taperingly from the bead core; the radial height of the radially outer edge of each carcass turned up portion being 0.3 to 0.5 times the radial height of the tread edge, both from the bead base; the radial height of the radially outer edge of each bead apex from the bead base being 0.3 to 0.5 times the radial height of the tread edge; the belt composed of at least one spirally wound cord having an elastic modulus of not less than 600 kgf/sq.mm, and formed by winding spirally a ribbon of rubber in which the at least one cord is embedded; and each sidewall composed of an axially inner hard rubber layer having a JIS A hardness of 65 to 75 and an axially outer soft rubber layer disposed on the axially outside of the inner layer and having a JIS A hardness of not more than 60.
REFERENCES:
patent: 3052275 (1962-09-01), Hylbert, Jr.
patent: 4019551 (1977-04-01), Kolowski et al.
patent: 4773462 (1988-09-01), Ohkuni et al.
patent: 4953605 (1990-09-01), Kawamura et al.
Mechanics of Pneumatic Tires, ed. Samuel Clark, U.S. Dept. of Transportation, Aug. 1981, p. 881.
Naito Sadaaki
Suzuki Shigehiko
Yasui Itsuo
Ball Michael W.
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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