Pneumatic tire bead portion structure

Details Pneumatic tire bead portion structure Pneumatic tire bead portion structure

1987-06-01

1988-02-23

Simmons, David

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152542, 152546, 152547, 152552, 152553, 152554, 152555, B60C 1500

Patent

active

047264080

ABSTRACT:
The invention relates to a pneumatic radial carcass type tire for heavy duty use having an improved reinforcing structure for the bead region. In a tire comprising a four ply radial carcass (1), the two bead regions are each reinforced by a bead core (2) and an axially inner (6) and an axially outer (7) textile reinforcing layer and a rubber apex strip (8). As compared to the prior art, the relatively low rubber apex strip (8) and the resulting low separation point between the first (3) and second (4) set of carcass plies reduces the sheer stresses between these carcass plies while the specific arrangement of the axially inner (6) and axially outer (7) reinforcing layers retains the required stiffness in the bead region (5). A particular durable bead region (5) is thus obtained.

REFERENCES:
patent: 2971553 (1961-02-01), Woodall
patent: 3638705 (1972-02-01), Eevienne et al.
patent: 4023608 (1977-05-01), Meiss
patent: 4366851 (1983-01-01), Makino et al.
patent: 4398584 (1983-08-01), Tansei et al.
patent: 5024901 (1977-05-01), Poque 152555

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