Pneumatic tire

Abstract

A tire is provided that secures sufficient braking performance on both a dry road and a wet road, reduces rolling resistance and secures abrasion resistance. A pneumatic tire 10 has a tread 12 formed with a first circumferential direction groove 14 and first fine grooves 18 with wall faces that make contact with each other when the tread 12 contacts the ground and undergoes compressive deformation, the first circumferential direction groove 14 and the first fine groove 18 partitioning center ribs 16. Center blocks 24 are partitioned by second circumferential direction grooves 20 formed at the tire width direction outside of the first fine grooves 18 and by center lug grooves 22 extending from the respective first fine groove 18 to the respective second circumferential direction groove 20. First sipes 40 are formed in the surface of the center blocks 24 extending in the tire circumferential direction from a wall face 24B toward a wall face 24C and terminating within the block, and second sipes 42 are formed in the surface of the center blocks 24 extending in the tire circumferential direction from the wall face 24C toward the wall face 24B, the second sipes 42 curving around before reaching the wall face 24B, being open to the wall face 24A, and not intersecting with the first sipes 40 when seen in plan view. The pneumatic tire 10 can thereby secure sufficient braking performance on both a dry road and a wet road, reduce rolling resistance and secure abrasion resistance.

Description

technical field [0001] The invention relates to a pneumatic tire, in particular to a pneumatic tire for passenger cars. Background technique [0002] In conventional pneumatic tires, in order to ensure braking performance by utilizing the edge effect, a plurality of blocks are divided by forming circumferential grooves extending in the circumferential direction and lateral grooves extending approximately in the width direction on the tread surface. Such a method (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 09-328003 [0004] However, in a pneumatic tire having grooves arranged as described above, there is a problem that the edge portion of the block on the lug groove side is rolled up due to friction with the road surface on a dry road surface, and sufficient braking performance cannot be ensured. In addition, on wet and slippery roads with a small coefficient of friction, although the edges on the side o...

AI Technical Summary

Problems solved by technology

[0004]However, when a pneumatic tire with grooves arranged as described above is on a dry road surface, friction between the road surface and the edge portion of the block on the side of the lug groove Rolled up, there is a problem that sufficient braking performance cannot be secured

In addition, on wet and slippery roads with a small coefficient of friction, although the edges of the blocks on the side of the lug grooves effectively function to ensure a certain degree of braking performance, the braking performance on wet and slippery roads is also limited. Market demand for further improvement

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