Pneumatic tire and manufacturing method of the same

摘要

A pneumatic tire has a conductive portion formed by a conductive rubber is provided in the tread rubber formed by a nonconductive rubber. The conductive portion has an outer skin portion and a projection portion. The outer skin portion is formed on a surface of the tread rubber, and extends to an inner side in a tire width direction from a side surface of the tread rubber so as to terminate at a position which goes beyond a contact end. The projection portion spirally extends from a position in an outer side than contact end so as to reach a position in an inner side in the tire width direction than the contact end, and protrudes to an inner side in a tire diametrical direction from the outer skin portion so as to terminate without reaching a bottom surface of the tread rubber.

主权项

1. A pneumatic tire comprising:
a tread rubber formed by a nonconductive rubber; a conductive portion formed by a conductive rubber and reaching a side surface of the tread rubber from a contact surface; and the conductive portion being provided in the tread rubber, wherein the conductive portion comprises: an outer skin portion which is formed on a surface of the tread rubber, and extends to an inner side in a tire width direction from the side surface of the tread rubber so as to terminate at a position which goes beyond a contact end; and a projection portion which spirally extends along a tire circumferential direction from a position in an outer side in the tire width direction than contact end so as to reach a position in an inner side in the tire width direction than the contact end, and protrudes to an inner side in a tire diametrical direction from the outer skin portion so as to terminate without reaching a bottom surface of the tread rubber, wherein a terminal end position of the projection portion is set within a region which is between 15 and 80% of a main groove depth from the surface of the tread rubber .