Bead construction for a heavy duty pneumatic tire

Details Bead construction for a heavy duty pneumatic tire Bead construction for a heavy duty pneumatic tire

1978-03-29

1980-10-14

Bertsch, Richard A.

Resilient tires and wheels

Tires, resilient

Patches

152362R, B60C 1500, B60C 902

Patent

active

042275636

ABSTRACT:
A heavy duty pneumatic tire is provided with bead cores of symmetrical or asymmetrical polygonal cross-sectional. Extending radially outwardly therefrom are apex strips of a hard rubber compound which contact the bead cores along their radially outwardly oriented faces. The apex strips have a width at least as great as the width of the bead cores measured in a selected direction, and have a height of not more than 1.5 times the width of the bead cores. The terminal ends of turnups formed by wrapping a carcass ply radially about the bead cores, and reinforcement strips are enveloped in cushion elements of a rubber material which are softer than the carcass ply and the apex strips. The apex strips have a markedly compact shape cross sectionally and form with the bead cores, rigid units through which stresses occurring in the carcass during tire operation can be transferred. Residual forces in the turnups and the reinforcement strips can be absorbed readily by the cushion elements to reduce the occurrence of fatigue cracks in the beads.

REFERENCES:
patent: 3372773 (1968-07-01), Warren et al.
patent: 3406733 (1968-10-01), Boileav
patent: 3682223 (1972-08-01), Simpson
patent: 4029137 (1977-06-01), Suydam
patent: 4085787 (1978-04-01), Maiocchi

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