Pneumatic tire

Abstract

The invention provides a pneumatic tire with improved anti-fracturing performance of the tire inner face of a tire ring part. The solution is that isolation glue (6) contacting with the outer surface of the inner bushing rubber (5) is provided with an extending part (61) that is more adjacent to the radial inner V side of the tire than the inner bushing rubber (5) and extends. Cord thread chafer (7) arranged along the cord fabric layer (4) on the periphery of the tire ring core (1a) is provided with an end part (7Ei) between the cord fabric layer (4) and the isolation glue (6). Rigidity difference of the rubber chafer forming the bottom face of the chafer and the isolation glue (6) is within 5 degrees. An interface (11) of the inner bushing rubber (5) and the isolation rubber (6) is exposed out of the tire inner face. An interface (12) of the isolation glue (6) and the rubber chafer (8) is more adjacent to the radial inner side of the tire relative to the end part (7Ei) of the cord thread chafer (7) and is exposed on the inner face of the tire and the extending part (61) is exposed out of the inner face of the tire between the interface (11) and the interface (12).

Description

Technical field [0001] The present invention relates to a pneumatic tire having excellent crack resistance in the tire inner surface of a bead portion, and is particularly useful as a pneumatic tire for heavy loads. Background technique [0002] Such as Figure 4 As shown, in a heavy-duty pneumatic tire, in order to be durable under high internal pressure and high load, a rubber chafer made of hard rubber with excellent wear resistance is arranged on the bottom surface of the bead in contact with the rim 38 (rubber chafer). In addition, in order to properly maintain the air pressure, the air-impermeable inner liner rubber 35 is arranged on the inner surface of the tire. in Figure 4 Among them, the end 35E of the inner liner rubber 35 is covered with the rubber chafer 38, and a structure in which the end of the inner liner rubber is exposed to the inner surface of the tire is also known (for example, Patent Documents 1-3). [0003] When loading and unloading on the rim or driving u...

AI Technical Summary

Problems solved by technology

[0012] The inventors of the present invention have made repeated studies in order to achieve the above object, and found the following problem in the structure of the above-mentioned prior art: the rubber chafer and the inner liner rubber having a large difference in hardness are in a narrow area ( Figure 4 The area X) is in contact, so that the interface between the rubber chafer and the inner liner rubber is exposed on the inner surface of the tire, which is the main cause of cracking

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