Pneumatic radial tire for heavy duty

Details Pneumatic radial tire for heavy duty Pneumatic radial tire for heavy duty

1998-01-09

2000-05-23

Maki, Steven D.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

15220924, 152902, 152DIG3, B60C 1111, B60C 1112, B60C 1113, B60C11500

Patent

active

060655178

ABSTRACT:
A heavy duty pneumatic radial tire having sub grooves provided on a tread surface which has a center main groove and two outer main grooves. The sub grooves extend in the tire width direction and together with the main grooves, divisionally form two block rows composed of a plurality of blocks. The sub grooves are inclined in a direction opposite to the tire rotating direction from the center main groove toward the outer main grooves. The inclination angle of the sub grooves is gradually and continuously reduced from a first inclination angle measured at the center main groove to a second inclination angle measured at the outer main groove. The first inclination angle is set in the range from 70 to 90.degree. while the second inclination angle is set in the range of greater than 30.degree. and less than the first inclination angle. Further, notched grooves can be provided dividing the shoulder areas of the tread surface into a plurality of blocks. The notched grooves can be inclined in a direction opposite to the tire rotating direction.

REFERENCES:
patent: D384311 (1997-09-01), Maruyama et al.
patent: 4832099 (1989-05-01), Matsumoto
patent: 5044414 (1991-09-01), Ushikubo
patent: 5127455 (1992-07-01), Remick
patent: 5421391 (1995-06-01), Himuro
patent: 5580404 (1996-12-01), Hitzky

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