pneumatic tire

Abstract

The pneumatic tire provided by the present invention can suppress uneven wear of the tread portion. A pneumatic tire is divided into a pair of shoulder land portions ( 40 ) and a pair of middle land portions ( 20 ) by providing a center main groove ( 9 ) and a pair of shoulder main grooves ( 10 ). Edges ( 23 ) on both sides of the middle land portion ( 20 ) in the tire circumferential direction extend obliquely to the outside of the tire axial direction at an angle α in the range of 5° to 12° relative to the tire axial direction. Edges (43) on both sides in the tire circumferential direction of the shoulder land portion (40) are inclined at an angle β with respect to the tire axial direction, and the angle β is in the range of the above-mentioned angle α to 17°. The tire circumferential distance (L1) between the tire axial inner end (46) and the outer end (47) of the end edge (43) of the shoulder land portion (40) is the tire circumference of the shoulder land portion (40). 0.03 to 0.12 times the grounding length (L2) of the direction.

Description

technical field [0001] The invention relates to a pneumatic tire which improves the shape of the contact surface and improves the partial wear resistance. Background technique [0002] Such as Figure 5 As shown, various types of pneumatic tires have conventionally been proposed that have main grooves a extending continuously in the tire circumferential direction in the vicinity of the tread edge b. Such a pneumatic tire has a problem that so-called shoulder chip wear tends to occur in which the outer end portion d in the tire axial direction of the shoulder land portion c between the main groove a and the tread edge b is worn unevenly. [0003] In response to such a problem, for example, the following Patent Document 1 proposes a pneumatic tire in which the rigidity of each land portion extending in the tire circumferential direction is rationalized by specifying the number of sipes formed in the land portion, thereby suppressing the Partial wear of the land part. However...

AI Technical Summary

Problems solved by technology

However, even with such a pneumatic tire, there is room for further improvement in suppressing partial wear.

[0004] In addition, when the ground contact pressure of the shoulder land portion c is increased to suppress slipping with the road surface in order to suppress the wear of the shoulder defect, there is a possibility that slippage between the middle land portion f and the road surface is likely to occur, and the distance between the middle land portion f and the road surface may be reduced. The so-called track wear in which the outer end e produces guide rail-like partial wear

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