Pneumatic radial tire tread for reducing wandering

Details Pneumatic radial tire tread for reducing wandering Pneumatic radial tire tread for reducing wandering

1987-05-07

1989-06-06

Simmons, David A.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152DIG3, B60C 1106, B60C 1112

Patent

active

048362573

ABSTRACT:
In order to improve the wandering performance of a radial tire, that is, to increase the camber thrust, the camber torque and the self-alignment effort of the tire without degrading various performances required for the radial tire, the radial tire is formed with a plurality of main zigzag wide grooves extending in the circumferential direction of the tire; at least one auxiliary straight narrow groove disposed on the shoulder rib and extending in a circumferential direction of the tire; and a plurality of sipes arranged outside the auxiliary groove at regular intervals along the outermost circumferential edge of the tire and extending in the lateral direction of the tire from the outermost end of the tire to the auxiliary groove. The width W.sub.a of the auxiliary groove is 1 to 4% of that of the main grooves W.sub.m ; the outward inclination angle .theta..sub.a is 10 to 60 degrees with respect to a normal line perpendicular to the tread outer surface; the position of the auxiliary groove is such that a distance S.sub.a from an outermost edge of the tread thereto is 20 to 80% of a distance S.sub.m from the same outermost edge to the main grooves.

REFERENCES:
patent: 3411559 (1968-11-01), Verdier et al.
patent: 4258769 (1981-03-01), Makino et al.
patent: 4262722 (1981-04-01), Takigawa et al.
patent: 4282914 (1981-08-01), Takigawa et al.
patent: 4298046 (1981-11-01), Herbelleau
patent: 4461334 (1984-07-01), Tansei et al.
patent: 4480671 (1984-11-01), Giron
patent: 4546808 (1985-10-01), Fontaine

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