Pneumatic tire and manufacturing method of pneumatic tire

Abstract

A pneumatic tire has a rubber member constructed by a rubber ribbon winding body formed by spirally winding a rubber ribbon. The rubber ribbon includes a composite rubber ribbon (20) which is formed by a non-conductive rubber (21), and a conductive rubber (22) partly covering the non-conductive rubber. The composite rubber ribbon has a flat cross sectional shape and is gradually reduced in its thickness toward both ends. The conductive rubber (22) has a cross sectional area which is equal to or less than 3% of a cross sectional area of the composite rubber ribbon (20), and forms a surface in one side and a surface in the other side in both ends of the composite rubber ribbon. The composite rubber ribbons that are adjacent in the width direction are partly overlapped, and a conductive route is provided by the conductive rubber connected between the composite rubber ribbons.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of releasing static electricity generated on a vehicle body or tire to a road surface, and a method for manufacturing the same. Background technique [0002] In recent years, there has been proposed a pneumatic tire which mixes a high ratio of silica. However, this tread rubber has a high electrical resistance compared with a pneumatic tire mixed with a high proportion of carbon black, and prevents discharge of static electricity generated in the vehicle body or the tire to the road surface, and thus has the problem of easily generating troubles such as radio noise. [0003] Therefore, a pneumatic tire has been developed in which a conductive rubber mixed with carbon black or the like is partly arranged on a tread rubber made of a non-conductive rubber mixed with silica or the like to provide a conductive path, whereby the conduction performance can be exhibited. Not limited to tread rubber, o...

AI Technical Summary

Problems solved by technology

However, in the case of using a small amount of conductive rubber in order to increase the rolling resistance reduction effect, the rubber belts adjacent in the width direction are partially repeated, and the conductive rubber is connected between them, and the conductive rubber is at the rubber belt interface. The connection becomes insufficient, so that the conductive path is easily disconnected

In addition, since the broken line at the rubber belt interface continues along the tire's circumferential direction, it may affect the conduction performance.

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