Loading tyre

Abstract

The invention discloses a loading tyre, which can minimize lifetime loss due to the wearing to the maximum and further prevent a phenomenon that stone is clamped therein. A sawtooth-shaped main groove is equipped on the tyre face. The groove walls on the two sides of the sawtooth-shaped main groove extend in a way to alternatively be directed towards a projecting curve point projecting towards the groove width center and a concave curve pointed recessed towards the groove width center. The sawtooth-shaped main groove comprises internal sawtooth-shaped main grooves on the two sides of the tyre equator. The two-side groove walls are provided with a projecting conical face formed by cutting the corner part through an inclined face on the projecting curve point and the concave curve point when the groove walls and the tyre face treading parts intersect with one another. The two-side groove walls are further provided with a concave conical face formed by cutting the corner part through an inclined face on the concave curve part having the concave curve point when the groove walls and the tyre face treading parts intersect with one another. The tyre circumferential length (La) on the projecting conical face is different from the tyre circumferential length (Lb) on the concave conical face.

Description

technical field [0001] The invention relates to a load-carrying tire, in particular to a load-carrying tire with improved stone trapping resistance. Background technique [0002] In recent years, with the standardization of the road network and the development of high-performance vehicles, many truck tires used for trucks, buses, etc. are used tires that have a plurality of circumferential main grooves extending in the tire circumferential direction on the tread portion. Ribs are used to improve high-speed driving performance, and the above-mentioned circumferential main grooves adopt zigzag grooves to improve traction and braking. [0003] However, when such a truck tire is used to drive on non-paved roads such as gravel roads, stone inclusions are likely to occur in the above-mentioned circumferential main groove, and if the tires are driven with the stone inclusions generated, there is a possibility of damage. The bottom of the ditch will cause tire damage. In particula...

AI Technical Summary

Problems solved by technology

[0005] However, in the case of such two-step tapered grooves, since the rubber volume of the tread portion is reduced by the portion where the tread side wall portion b2 is gently inclined, there is a problem that the wear life of the tire is shortened.

In addition, especially in order to suppress stone inclusion in the curved portion of the zigzag groove, it is necessary to set the angle θ of the tread side wall portion b2 relative to the normal line of the tread tread Ts to be large, for example, 40° or more. In this case, the rubber volume will be further reduced, so the reduction in wear life becomes a bigger problem

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