PNEUMATIC TIRE

摘要

An objective of the present invention is to provide a pneumatic tire whereby primarily rolling resistance is minimized and noise is minimized. This pneumatic tire tread rubber (5) comprises: a cap part (50) which is formed of non-conductive rubber and configures a grounding surface; a base part (51) which is disposed on the inner side of the cap part (50) in a tire radial direction (RD); and conductive parts (52) which are disposed in both of a pair of lateral end parts which are at ends of the cap (50) in a tire width direction, traverse the inner part of the cap (50) while avoiding a location which covers the grounding surface, and form shapes which connect the grounding surface with the bottom surface (50b) of the cap part (50) in the tire meridian cross-section. The conductive parts (52) are provided with extended sites (52b) which branch off outward to the tire width direction (WD) from conductive paths (52a) which connect the grounding surface with the bottom surface (50b) of the cap part (50). The conductive parts (52) are formed of a conductive rubber which has different rubber hardness from the non-conductive rubber which forms the cap part (50).

主权项

1. A pneumatic tire comprising:
a pair of bead parts; a side wall part which extends to an outer side in a tire radial direction from each of the bead parts; a tread part which is connected to outer ends in the tire radial direction of the respective side wall parts; a toroidal carcass layer which is provided between the pair of bead parts; a side wall rubber which is provided in an outer side of the carcass layer in each of the side wall parts; and a tread rubber which is provided in an outer side of the carcass layer in the tread part, wherein the tread rubber includes:
a cap part which is formed of a non-conductive rubber and constitutes a grounding surface;a base part which is provided in an inner side in the tire radial direction of the cap part; anda conductive part which is provided in at least one lateral end part of a pair of lateral end parts in both ends of the cap part in a tire width direction, and is formed so as to connect the grounding surface and a lateral end surface or a bottom surface of the cap part in a tire meridian cross section through an inner portion of the cap part while avoiding a position covering the grounding surface, and wherein the conductive part has an extended site which is branched from a conductive path connecting the grounding surface and the lateral end surface or the bottom surface of the cap part so as to extend to an outer side in the tire width direction, and is formed of a conductive rubber having a different rubber hardness from the non-conductive rubber forming the cap part.