B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
B60C 11/117 (2006.01) B60C 11/04 (2006.01) B60C 11/12 (2006.01) B60C 11/13 (2006.01)
Patent
CA 2190819
A pneumatic tire for heavy load comprises a plurality of main grooves provided in a tread face in such a manner as to extend straight in a tire- circumference direction, lateral grooves provided in a land in such a manner as to extend in a tire-width direction and to be arranged at a predetermined pitch in the tire-circumference direction, the land being defined between the main grooves, and a block line containing a plurality of blocks into which the land is separated by the main grooves and the lateral grooves. Each of the lateral grooves includes a pair of right and left wide groove portions which are respectively open to the main grooves provided on opposite sides of the block line, and a narrow groove portion which allows the pair of right and left wide groove portions to communicate with each other and which is narrower in groove width than each of the wide groove portions, the right and left wide groove portions and the narrow groove portion being arranged in a bent shape. The right and left wide groove portions are displaced from each other in the tire- circumference direction and are made gradually wider toward the respective main grooves, and each of the narrow groove portions is formed in a straight shape. Each of the narrow groove portions has an inclination angle .THETA. of 25-45° relative to the tire circumference direction and a tire-circumferential length Z to satisfy the relation, 0.2P ~ Z ~ 0.75P with respect to a pitch length P of the lateral grooves.
Ridout & Maybee Llp
The Yokohama Rubber Co. Ltd.
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