The raw material provided is unvulcanized tread rubber, and the anti-crack or rib tearing pneumatic tire is separated from these defects, which is the main body of the groove bottom groove and the pneumatic tire with this defect prevention invention. Solution: Raw material 3' is unvulcanized tire rubber, which is inflated and consists of two layers, such as cover layer 2 "and base rubber layer 1". In addition, the upper limit of rubber, the thickness of rubber layer 2 corresponds to a position, and the main groove around it is established in this way, and the tire pressure gradually forms a larger thickness like a raised rubber layer 1' aligned with the base. In addition, the pneumatic tire has a tread rubber 3, which is composed of two layers, namely, a first base rubber and a second laminated rubber head, and the second laminated rubber head is penetrated with a rubber layer 1. The base, and further, the official part, corresponds to the boundary of the main groove of the periphery 4a. At the line 4 and the cover layer 1.2, the rubber tire has a transverse section which is a hidden peripheral main groove in the shape of a groove. The boundary line portion also has more external 4a-class tires positioned in the radial direction than the main groove 5 around the groove bottom 5a.
In order to improve the effect of preventing the bottom of the rib groove from tearing to prevent cracks, the weak groove provides a surface at the upper end of each shoulder. Composition: the width w> of the concave part of the shallow groove is 2/ the width of someone is larger than that of the groove w>, and the slender groove < <1/one is a slender groove built on the intake side. In the fourth line of 1, the direction around the shoulder of the final surface is along a tire. At the same time, the elongated groove 4 is inclined and straight, and the tread on the inner side of the tire is more than the normal. At the same time, the tip side smoothly bends to the axial inner side of the tire.
It is translated by computer tools for reference.