Tire for heavy vehicle

Abstract

The objective of the present invention is to provide tires for heavy vehicles in long-distance driving. The invention is characterized by having two decoupling grooves vertically arranged on the side of the tire shoulder, and increasing the width of decoupling grooves with a projected part formed between two decoupling grooves, so that the upper side of the tire shoulder can be prevented from being coupled with the lower side even with a heavy load to avoid the worry about the insertion of foreign bodies like stones into decoupling grooves.

Description

technical field [0001] The present invention relates to a tire for a long-distance heavy vehicle, and more particularly to a tire for a heavy vehicle in which decoupling grooves are provided on the shoulder to suppress uneven wear on the shoulder. Background technique [0002] Such as figure 1 As shown in (A), in a conventional tire mounted on a heavy-duty vehicle, the deflection of the shoulder portion 102 is prevented by providing a decoupling groove 103 at the land contact portion of the shoulder portion 102 in contact with the tread 101 . wear and tear. [0003] However, this tire has the following disadvantages, that is, cracks (Crack) often occur at the bottom of the decoupling groove 103, and when this crack extends to the edge of the belt layer, it will cause a belt accident. Or it extends to the sidewall portion to cause a disadvantage that the protruding portion 105 as a sacrificial rib falls off. [0004] Therefore, if figure 1 As shown in (B), there is provid...

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Problems solved by technology

[0005] However, this tire has the following disadvantages, that is, the area of ​​the tread 101 is reduced, as a result, the contact area between the tire and the road surface is reduced, the width of the tread is reduced, and the wear life is shortened, so the tire has to be endured. Trouble with poor performance such as surface traction and reduction in braking force

[0006] In addition, among conventional tires, the following tires have also been proposed, such as figure 1 As shown in (C), a decoupling groove 103 is provided on the side wall of the shoulder portion 102. By removing the protruding portion as a sacrificial rib, concerns about wear loss and crack occurrence are relieved. However, the tire with this structure However, the tire has the following disadvantages, that is, when a large load is applied to the tire during driving, the upper and lower parts of the entrance of the decoupling groove 103 contact each other, thus causing the decoupling groove 103 to fail to perform its function.

On the other hand, if the entrance of the above-mentioned decoupling groove 103 is formed excessively, then foreign matter such as stones may be caught in the decoupling groove, so it is not desirable to enlarge the entrance of the decoupling groove 103. Department size

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