Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorTakeshi Kuroki
Life of this patent
Estimating the term…
Abstract
A tread rubber 2G comprises a base portion 9 made of electrically non-conductive rubber compounding silica and having a width substantially equal to a width of the tread reinforcing-cord layer 7; a conducting portion 11 made of the electrically conductive rubber, covering a radially outer surface of the base portion 9 and extending in the axial direction of the tire, and protruding both end portions 11a and 11b outwardly from the base portion 9 so as to connect the both end portions with tire members Ty electrically conducted to a rim J at a state of mounting the tire on the rim; and a cap portion 10 made of electrically non-conductive rubber compounding silica and disposed outside the conducting portion 11 in the radial direction of the tire and forming a major part of a ground contact surface 2a.
Claims14
A pneumatic tire comprising
- a toroidal carcass extending from a tread portion to a bead core in a bead portion through a sidewall portion,
- a tread reinforcing-cord layer disposed outside the carcass in the radial direction of the tire and inside the tread portion, and
- a tread rubber disposed outside the tread reinforcing-cord layer in the radial direction of the tire, characterized in that
- said tread rubber comprises
- a base portion made of electrically non-conductive rubber compounding silica, disposed outside said tread reinforcing-cord layer in the radial direction of the tire, and having a width substantially equal to a width of the tread reinforcing-cord layer;
- a conducting portion made of electrically conductive rubber, covering a radially outer surface of said base portion and extending from an axially one end portion to the other end portion so as to form a continuous smooth arc-curve in the axial direction of the tire, and protruding the both end portions axially outwardly from said base portion so as to connect the both end portions with tire members electrically conducted to a rim at a state of mounting the tire on the rim, wherein a radially outmost portion of said conducting portion in a meridian section of the tire is exposed at a ground contact surface;
- and
- a cap portion made of electrically non-conductive rubber compounding silica and disposed outside said conducting portion in the radial direction of the tire and forming a major part of said ground contact surface,
- wherein said cap portion comprises a first cap portion disposed on one side and a second cap portion disposed on another side of the outmost portion of said conducting portion in the axial direction of the tire,
- wherein an axial width of the outmost portion of the conducting portion is in a range of from 0.5 to 20 mm.
A pneumatic tire comprising
- a toroidal carcass extending from a tread portion to a bead core in a bead portion through a sidewall portion,
- a tread reinforcing-cord layer disposed outside the carcass in the radial direction of the tire and inside the tread portion, and
- a tread rubber disposed outside the tread reinforcing-cord layer in the radial direction of the tire, characterized in that
- said tread rubber comprises
- a base portion made of electrically non-conductive rubber compounding silica, disposed outside said tread reinforcing-cord layer in the radial direction of the tire, and having a width substantially equal to a width of the tread reinforcing-cord layer;
- a conducting portion made of electrically conductive rubber, covering a radially outer surface of said base portion and extending from an axially one end portion to the other end portion so as to form a continuous smooth arc-curve in the axial direction of the tire, and protruding the both end portions axially outwardly from said base portion so as to connect the both end portions with tire members electrically conducted to a rim at a state of mounting the tire on the rim, wherein a radially outmost portion of said conducting portion in a meridian section of the tire is exposed at a ground contact surface;
- and
- a cap portion made of electrically non-conductive rubber compounding silica and disposed outside said conducting portion in the radial direction of the tire and forming a major part of said ground contact surface,
- wherein said cap portion comprises a first cap portion disposed on one side and a second cap portion disposed on another side of the outmost portion of said conducting portion in the axial direction of the tire,
- wherein said conducting portion protrudes at least not less than 2 mm from said base portion in the axial direction of the tire.
Dependencies are inferred from the claim text.