Bead structure for pneumatic tire

Details Bead structure for pneumatic tire Bead structure for pneumatic tire

1991-05-22

1993-11-16

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152546, 152547, B60C 1506

Patent

active

052614760

ABSTRACT:
A pneumatic tire comprises a radial carcass of at least one carcass ply wound around each of bead cores from inside toward outside to form a turnup portion, an outer ply inclusive of the turnup portion containing cords each having a modulus of elasticity of not less than 2500 kg/mm.sup.2 and a diameter d, and a rubber stiffener arranged at its radially inward portion between the carcass ply and the outer ply. In a bead structure of such a pneumatic tire, the stiffener is divided into an inner stiffener portion and an outer stiffener portion around a specified boundary plane, and each of these stiffener portions is comprised of rubber having a given Shore A hardness, and a volume ratio of the outer stiffener portion in the stiffener is not less than 10%.

REFERENCES:
patent: 4185677 (1980-01-01), Motomura et al.
patent: 4215737 (1980-08-01), Motomura et al.
patent: 4366851 (1983-01-01), Makino et al.
patent: 4510984 (1985-04-01), Kishida et al.
patent: 4699194 (1987-10-01), Iuchi
patent: 4953605 (1990-09-01), Kawamura et al.

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