Patent ID: 7784509
Filing Date: 2010-08-31
Classification: B60C

Abstract:
1. A pneumatic tire comprising a tread portion provided with axial grooves opened at a tread edge and a circumferential groove adjacent to said tread edge, wherein each said axial groove is provided between said circumferential groove and tread edge with a thin partition wall, the thickness of the partition wall is in a range of from 2 to 7% of the maximum axial distance between the tread edge and an axially outer edge of the circumferential groove, the circumferential groove is a zigzag groove having axially outwardly protruding zigzag corners, said axial grooves each extend from said tread edge to or close to one of said axially outwardly protruding zigzag corners, wherein the axial groove extends close to said one of the zigzag corners, the partition wall of the axial groove is positioned at the axially inner end of the axial groove, the axially inner surface of the partition wall is bent in a form of V-shape, the axially outer surface of the partition wall is substantially in parallel with the axially inner surface of the partition wall so that the partition wall has a substantially constant thickness, or alternatively, is flat so that the partition wall is decreased in the thickness in its central part in the tire circumferential direction and has a minimum thickness in the center part and a maximum thickness at the circumferential ends thereof and the minimum thickness is not less than 0.5 times the maximum thickness, and the partition wall extends radially outwardly up to the tread surface.