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 that achieves both uneven wear resistance and drainage performance by improving the tread pattern. Background technique [0002] Conventionally, in order to suppress uneven wear of shoulder ribs in heavy-duty pneumatic tires, a method has been widely used: forming a narrow rib-shaped uneven wear sacrificial sacrifice with a drop from the tread in the main grooves in the circumferential direction. (hereinafter abbreviated as "BCR"), the shear force in the running direction of the edge portion of the shoulder rib body is reduced by generating a shear force in the tread opposite to the running direction of the vehicle by the BCR (refer to the Japanese special Kaihei 2-88311 Bulletin). [0003] here, Image 6 (a) shows a partial plan development view of a heavy duty pneumatic tire tread having a BCR. also, Image 6 (b) yes Image 6 A cross-sectional view of t...

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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