Pneumatic tire

摘要

A pneumatic tire is provided with a large number of holes that are arranged in the tire's circumferential direction. These holes are provided in land portions that are provided in both shoulder sections of a tread. The land portions can have different pitch lengths. Each of the holes has formed there inside a projection having an upper end with a flat surface or a convex surface. The distance between the outer wall of the projection at the upper end thereof and the inner wall of the hole is set in the range from 1 to 5 mm. The upper end of the projection is located at a position below the opening of the hole.

主权项

1. A pneumatic tire comprising:
a tire center section of a tread surface of the tire; a first shoulder section of the tread surface of the tire disposed on a first side of the tire center section with respect to a width direction of the tire; and a second shoulder section of the tread surface of the tire disposed on a second side of the tire center section with respect to the width direction of the tire, each of the first and second shoulder sections including a plurality of lug grooves extending in the width direction of the tire to define a plurality of land portions, the lug grooves being spaced apart in a circumferential direction of the tire at a variable pitch, at least some of the land portions of each of the first and second shoulder sections including at least one hole, the holes being aligned in the circumferential direction of the tire of each of the first and second shoulder sections, respectively, each of the holes including a projection formed inside thereof, each of the projections having an upper end with an upper end surface that is positioned lower than an opening of the hole, a shape of the opening of each of the holes being circular or elliptical in a plan view, a shape of each of the projections being circular in a plan view, a shape of the upper end of each of the projections being hemispherical, and a vertical depth from the tread surface of each of the land portions to the upper end surface of a corresponding one of the projections is set within a range from 1.0 to 5.0 mm inclusively, each of the holes being configured relative to a corresponding one of the projections formed inside thereof such that a distance between an outer wall of an upper end portion of each of the projections and an inner wall of a corresponding one of the holes is set within a range from 1 to 5 mm inclusively.