Patent ID: 8517069
Filing Date: 2013-08-27
Classification: B60C

Abstract:
1. A pneumatic tire including: two first main grooves extending in a tire circumferential direction, the two first main grooves being placed in a central area in three areas obtained by equally dividing a contact width of a tread part into three; a plurality of lateral grooves extending in a tire width direction from either tire-widthwise contact end to the central area, the plurality of lateral grooves being placed in the tread part; and a plurality of sipes formed in each of land sections defined in the tread part by the first main grooves and the lateral grooves, wherein a groove wall surface, of each first main groove, closer to a tire equatorial line is formed so as to cyclically repeat, in the tire circumferential direction, a change in an inclination angle of the groove wall surface to a direction normal to a tread surface of the tire, the change being a gradual increase from a minimum value of 0° to 15° to a maximum value of 15° to 45°, the lateral grooves include first lateral grooves communicating with either of said two first main grooves, and second lateral grooves communicating with neither of said two first main grooves, which are alternately placed in the tire circumferential direction, in places where the inclination angle of the groove wall surface, of the first main groove, closer to the tire equatorial line, is at its maximum, none of said lateral grooves communicates with the first main groove, and in the places, a groove wall surface, of the first main groove, closer to a corresponding contact end extends uninterruptedly.