Pneumatic radial tire with high durable bead portions

Details Pneumatic radial tire with high durable bead portions Pneumatic radial tire with high durable bead portions

1989-07-21

1991-10-01

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152510, 152549, B60C 300

Patent

active

050524577

ABSTRACT:
A pneumatic radial tire with high durable bead portions includes a pair of bead portions, a pair of sidewalls and a tread extending between the sidewalls, and further includes as a body reinforcement a carcass extending between the bead portions and consisting of plies whose cords are radially arranged. At least one ply being turned up about bead cores of the bead portions from inside to outside of the tire to form a turn-up portions. A carcass pass line in radial section of the tire in its self-holding position filled with 5% of a normal inner pressure under no-load condition includes curvature changing areas in a carcass profile curved toward the turned-up portions in the proximities of positions corresponding to a height of turn-up ends of the ply from a rim diameter line to cause compressive stresses in the bead portions near to the turn-up ends of the ply by deformations of the carcass when the normal inner pressure is filled in the tire. With the above arrangement, the durability at the bead portions of the tire is improved to an extent required for prolongation of life time obtained by recapping the tire repeatedly.

REFERENCES:
patent: 3631913 (1972-01-01), Boileau
patent: 4387758 (1983-06-01), Matsuda et al.
patent: 4762158 (1988-08-01), Furuya et al.
patent: 4915151 (1990-04-01), Sato et al.

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