Pneumatic tire

摘要

A pneumatic tire including at least four circumferential main grooves extending in the tire circumferential direction and a plurality of rib-like land portions partitioned by the circumferential main grooves in the tread portion. Additionally, an outer side second land portion includes a zigzag narrow groove having a zigzag shape, extending in the tire circumferential direction, and dividing the outer side second land portion in the tire width direction; and a plurality of first sipes disposed at a predetermined pitch in the tire circumferential direction, extending from an edge portion on the outer side in the tire width direction of the outer side second land portion toward the inner side in the tire width direction, and terminating prior to the zigzag narrow groove, leaving a gap for ventilation.

主权项

1. A pneumatic tire comprising: at least four circumferential main grooves extending in a tire circumferential direction, and a plurality of rib-like land portions that are partitioned and formed by the circumferential main grooves in a tread portion, wherein
when a pair of the circumferential main grooves on an outermost side in a tire width direction are referred to as “shoulder main grooves”; left and right land portions of the land portions partitioned by the shoulder main grooves on an inner side in the tire width direction are referred to as “second land portions”; a first of the second land portions is referred to as an “outer side second land portion”, and a second of the second land portions is referred to as an “inner side second land portion”, the outer side second land portion comprises: a zigzag narrow groove having a zigzag shape, extending in the tire circumferential direction, and dividing the outer side second land portion into a pair of ribs in the tire width direction; and a plurality of sipes disposed at a predetermined pitch in the tire circumferential direction, extending from an edge portion on an outer side in the tire width direction of the outer side second land portion toward the inner side in the tire width direction, wherein the zigzag narrow groove comprises a first inclined portion inclining at an angle of inclination a1 with respect to the tire circumferential direction, and a second inclined portion inclining at an angle of inclination α2 in the same direction as the first inclined portion with respect to the tire circumferential direction, the second inclined portion being shorter than the first inclined portion, the first inclined portion and the second inclined portion being connected alternately; the angle of inclination a1 of the first inclined portion is such that 2°≦α1≦10°; and the angle of inclination α2 of the second inclined portion is such that 40°≦α2≦90°, and wherein a groove width W2 of the first inclined portion and the second inclined portion is such that 0.5 mm≦W2≦3.5 mm.