Pneumatic tire

Abstract

A pneumatic tire capable of reducing rolling resistance and discharging static electricity generated during running, wherein each of a tread rubber, a breaker rubber, and a sidewall, respectively, has a volume specific resistivity of 1×108 Ω·cm or more, the pneumatic tire further including a conduction rubber embedded in the tread part so as to be at least partially exposed to a surface of the tread part, a coating rubber disposed on the upper part of the breaker part, a bead part rubber, and side part electroconductive rubber electrically connecting the conduction rubber to the beat part rubber, wherein each of the conduction rubber, the bead part rubber, the coating rubber and the side part electroconductive rubber has a volume specific resistivity of less than 108 Ω·cm.

Description

[0001]This application is a Divisional of U.S. application Ser. No. 12 / 155,295, filed Jun. 2, 2008, claiming priority of Japanese Patent Application No. 2007-159029 filed on Jun. 15, 2007, No. 2007-172695 filed on Jun. 29, 2007, Nos. 2007-188542 and 2007-188547 filed on Jul. 19, 2007, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a pneumatic tire improved in safety by keeping low rolling resistance and reducing static electricity generated during tire running.[0004]2. Description of the Background Art[0005]In recent years, various methods for using silica for a tread part, a breaker, a sidewall part, or the like of a tire have been proposed for the purpose of reduction in tire rolling resistance as well as of maintenance of wet grip performance. However, a problem of lack in safety is raised in the case where silica is contained in a large amount since electrical resi...

AI Technical Summary

Benefits of technology

The present invention is a pneumatic tire that has low rolling resistance and prevents static electricity accumulation during tire running. The tire is designed with a structure that reduces tire rolling resistance and static electricity accumulation in the tire contact area. This results in improved safety and reduced fuel consumption. The tire has a rubber blending that reduces rolling resistance and a structure that facilitates electrical connection between the tire and the road surface, leading to improved performance and safety.

Problems solved by technology

However, a problem of lack in safety is raised in the case where silica is contained in a large amount since electrical resistance of the tire is increased to generate spark due to static electricity, for example, during supply of fuel for a vehicle, so that the fuel catches fire.

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