Pneumatic tire for heavy load

Abstract

A pneumatic tire for heavy load enabling the co-existence of wet performance and uneven wear resistance performance is provided. The pneumatic tire for heavy load includes three circumferential main grooves 31 and 33 extending on a tread in the circumferential direction, and ribs 11 and 12 defined by these circumferential main grooves 31 and 33. The centerline of the center circumferential main grove 31 among the three circumferential main grooves is positioned on the equator line of the tread, and a thin rib-shaped uneven abrasion sacrificing part (BCR) 21 having a step in a clearance thereof from the surface of the tread is formed only in the center circumferential main groove 31.

Description

technical field [0001] The present invention relates to a pneumatic tire, in particular to a heavy-duty pneumatic tire which achieves both anti-uniform wear performance and drainage performance by improving the tread pattern. Background technique [0002] In the past, in heavy-duty pneumatic tires, in order to suppress the uneven wear of the shoulder ribs, the widely used method is to form a thin rib-shaped uneven wear sacrificial layer with a drop between the main groove in the circumferential direction and the tread. (hereinafter referred to as "BCR"), through the BCR, the tread generates a shear force opposite to the direction of travel of the vehicle, thereby reducing the shear force on the edge of the shoulder rib body in the direction of travel (refer to JP Kaiping No. 2-88311 Bulletin). [0003] here, Image 6 (a) shows a partially developed plan view of a heavy-duty pneumatic tire tread having a BCR. also, Image 6 (b) is Image 6 A cross-sectional view in the dire...

AI Technical Summary

Problems solved by technology

However, in order to improve the wet performance, if the sipes are provided approximately along the tire width direction in the entire area of ​​the rib sandwiched by the grooves in the circumferential direction, there will be a problem of uneven wear of the heel and toe from there, and it must be difficult to achieve Coexistence of wet performance and uneven wear resistance

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