Pneumatic tires

Abstract

In a pneumatic tire 1, the first three-dimensional lamellae 7 are provided with bent portions 7a which are bended upwardly a depth direction of the sipe, and are formed to have a constant sipe width W11-W14 along a depth direction of the sipe, wherein the second three-dimensional blades 8 with width proportions 8a-8c equipped which 3 a wider slat width W22-W24 have in an inner portion of the tread rubber, as a slat width W21 of a surface of the tread rubber 3 ,; wherein in a shoulder portion 3s of the tread rubber 3, an amount of the surface length L1s of the first three-dimensional lamellae 7 is longer than an amount of the surface length L2s of the second three-dimensional lamellae 8 and an amount of surface length L2c the second three-dimensional sipes 8 is at a central portion 3c of the tread rubber longer than an amount of surface length L1c the first three-dimensional sipes.

Description

technical field [0001] The present invention relates to a pneumatic tire having a plurality of three-dimensional sipes on tread rubber. Background technique [0002] In a pneumatic tire, when the tread rubber comes into contact with the road surface, the curved surface is deformed into a flat surface. As a result, a force (also referred to as "in-plane contraction force") acts from one end in the tire width direction, that is, the shoulder side, toward the tire width direction center, that is, the center side, on the ground contact surface in contact with the road surface, so that the tread rubber Deformation in the tire width direction. Such deformation (also referred to as "wiping deformation") occurs over the entire ground contact surface, but is particularly large in the outer side in the tire width direction, that is, in the shoulder region. [0003] Therefore, there is known a pneumatic tire having a plurality of three-dimensional sipes on the tread rubber (for examp...

AI Technical Summary

Problems solved by technology

[0004] However, in the inner side of the tread rubber in the tire width direction, that is, in the central region, due to such three-dimensional sipes, the rigidity of the tread rubber becomes too high, so the ground contact performance is reduced.

Specifically, the uniformity of the ground contact pressure of the block decreases, and the contact area of ​​the block also becomes smaller

As a result, the edge effect is also reduced, so braking performance on ice and steering performance on ice are reduced

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