Pneumatic belt tire

Abstract

The invention provides a pneumatic radial tire having cost competition and improving the bias abrasion performance to the tire shoulder by seeking for the optimization of the ground shape and the ground pressure. The pneumatic radial tire has a translot (2) having a plurality of circumferential main slots (1a, 1b) at the tread portion of the tire and extending along the width direction of the tire and a tread pattern for forming a plurality of ground lines (4a, 4b). In the tier shoulder ground line (4b) comprising ground end (E), a translot (2) extending from the circumferential main slots (1b) nearest to the ground end to the ground end (E) is stopped near the ground end, and continuous ground portions (L) are formed near the ground end. Side of the main slots (1b) of the tier shoulder ground line (4b) is approximately parallel to the intermittent slit auxiliary slot (3).

Description

technical field [0001] The present invention relates to a pneumatic radial tire. Specifically, it relates to a pneumatic radial tire which is cost-competitive and which improves partial wear performance of tire shoulders by optimizing the contact shape and contact pressure distribution. Background technique [0002] Conventionally, it is known in pneumatic tires that, for example, as described in Patent Document 1, by arranging a belt reinforcing layer between the belt layer and the tread, it is possible to suppress the centrifugal force during high-speed running from causing the tire to rotate. The tread portion produces a large radially increasing deformation toward the outside in the radial direction, and therefore, it is generally possible to reduce heat generation and deformation at the belt end, improve high-speed durability, and improve steering stability. [0003] However, the following tires are still widely used today because they do not have a belt reinforcement l...

AI Technical Summary

Problems solved by technology

[0005] However, in tires with a 2-steel belt structure, the belt layer width is narrower than the ground contact width due to manufacturing and durability reasons, so the belt cannot be restricted by the belt layer in the vicinity of the belt end of the shoulder portion. The radial deformation of the ply increases, so it is impossible to avoid the problem that the radial direction of the tire is greatly increased due to the centrifugal force during high-speed driving

There is a problem that if the radially increasing deformation of the shoulder portion is large in this way, a circumference difference will be generated between the shoulder portion and the middle portion, and the shoulder portion with a long circumference will be caused by driving. shoulder wear

[0006] In addition, in the 2-steel belt structure, since there is no belt reinforcement layer such as a cap and a layer, the belt may be bent, and a shoulder area may be formed in the ground contact surface. (shoulder block) Friction drawn inward

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