Heavy duty tire

Abstract

The invention provides a heavy duty tire, capable of decreasing the stone entrapment without causing cracks in the groove bottom and the decrease in the wet performance. The heavy duty tire comprises a tread portion provided with a central circumferential groove (3), a crown circumferential groove (4) on each side thereof and crown axial grooves extending therebetween so as to for crown blocks (5). The crown block (5) is circumferentially subdivides into two block pieces (5A, 5B) by a crown narrow groove (12). The crown axial groove (6) is provided in the groove bottom with a tie bar (15) rising therefrom and connecting the circumferentially adjacent two crown blocks each other. The crown axial grooves are inclined at an angle [alpha] of from 10 to 30 degrees with respect to the tire axial direction. The groove depth (H3) of the central circumferential groove (3) and the groove depth H6i of an axially inner part (6i) of the crown axial groove (6) which part is axially inside the tie bar (15) are set to be less than the groove depth (H4) of the crown circumferential groove (4).

Description

technical field [0001] The invention relates to a truck tire with a block pattern, in particular to a truck tire with improved rock-carrying performance. Background technique [0002] In addition to running on paved roads, truck tires are often used to drive on gravel roads with many pebbles and uneven roads, etc., in order to ensure traction. A block pattern divided into a plurality of blocks, wherein the tread groove includes a circumferential groove extending in the tire circumferential direction and a lateral groove in a direction intersecting the circumferential groove. However, in block tires for heavy loads, since the tread grooves are deep, there is a problem that stones are likely to be trapped in the tread grooves. [0003] The stone inclusion will cause the following problems. First, there are stones slightly larger than the width of the groove in the tread groove. During the repeated rolling of the tire, the stones that are trapped will drill into the bottom of ...

AI Technical Summary

Problems solved by technology

[0008] However, if the ditch wall surface is made into a gently inclined shape, the ditch bottom cannot be formed with a large arc because the ditch is deep, and cracks are likely to occur at the ditch bottom due to repeated deformation during driving.

In addition, when a protrusion is provided at the bottom of the ditch, the width of the ditch bottom must be ensured due to the protrusion, so the inclination of the wall surface of the ditch cannot be reduced, making it difficult for stones to fall out, and the discharge effect cannot be fully exerted.

In addition, when the opening width is reduced, the wet performance (drainage) tends to decrease due to the decrease in the groove volume.

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