Heavy load pneumatic radial tire

Details Heavy load pneumatic radial tire Heavy load pneumatic radial tire

1992-02-21

1994-05-03

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152DIG3, B60C 1112

Patent

active

053078519

ABSTRACT:
A heavy load pneumatic radial tire which includes at least one carcass layer in a radial direction and a reinforcing belt comprising at least two layers of metal cords around the outer periphery of the carcass in a tread portion, and in which a plurality of ribs partitioned by a plurality of main grooves extending in a tire circumferential direction are formed in a main grounding region of the tread surface and a narrow groove having a groove width of 1.5 to 5 mm and a groove depth of 60 to 120% of the depth of the main groove are disposed in a shoulder end zone of the ribs positioned at the shoulder in the tire circumferential direction, characterized in that a large number of primary kerfs extending from the narrow groove towards the tread center are intermittently disposed in the tire circumferential direction, and a large number of secondary kerfs extending in the tire circumferential direction are intermittently disposed at the positions closer to the tread center than the primary kerfs in the tire circumferential direction.

REFERENCES:
patent: 4449560 (1984-05-01), Tansei et al.
patent: 4739812 (1988-04-01), Ogawa et al.
patent: 4884606 (1989-12-01), Matsuda et al.
patent: 4993466 (1991-02-01), Ochiai

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