Pneumatic tire

Abstract

The invention provides a pneumatic tire in which the braking performance on wet road can be improved while maintaining the steering stability and wear resistance. The pneumatic tire (1) comprising a tread portion (2) provided with center portions (5) and shoulder portions (6). wherein each said center portion is provided with: a plurality of center lateral grooves (7) each of which extends from the shoulder main groove (4) toward the axially inside (C) of the tire without reaching the center main groove so as to have an axially inner end thereof on the center portion, and has an angle (theta 1) of from 35 to 65 degrees with respect to an axial direction of the tire; a plurality of center lateral sipes (8) each of which extends from the axially inner end (7i) of the center lateral groove to the center main groove and has the same inclination direction with the center lateral groove having an angle (theta 2) of from 35 to 65 degrees with respect to an axial direction of the tire; and a center longitudinal sipe (9) which connects between circumferentially adjacent center lateral grooves and is separated from an axially inner edge (5e) of the center portion in a first axial distance in a range of from 20 to 40 % of a width (L1) of the center portion.

Description

technical field [0001] The present invention relates to a pneumatic tire that maintains handling stability, wear resistance, etc., and improves wet braking performance. Background technique [0002] There is known a pneumatic tire having a block pattern in which a plurality of blocks are formed on a tread portion. In recent years, improvement in wet braking performance has been desired for such pneumatic tires. In order to improve the wet braking performance and smoothly discharge the water film between the tread portion and the road surface, especially the water film near the tire equator, there are known methods such as enlarging the groove connecting the tire equator side to the ground contact end side. , or the groove width and / or groove depth of the groove extending in the tire circumferential direction. [0003] However, all of the above-mentioned methods have the problem that wear resistance and steering stability tend to deteriorate as the rigidity of the block dec...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned methods all have the problem that the wear resistance and handling stability tend to deteriorate as the rigidity of the pattern block decreases.

In this way, there is a contradictory relationship between improving the wet braking performance and ensuring the rigidity of the pattern block, so it is very difficult to achieve both.

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