Motorcycle tire for traveling on rough terrain and tire vulcanization mold
AssigneeSumitomo Rubber Industries, Ltd.
InventorYutaka Ichiryu
Life of this patent
Estimating the term…
Abstract
To provide a motorized two-wheeled vehicle tire for traveling on uneven terrain, the block durability performance of which has been improved; and a tire vulcanization mold capable of molding said tire. A motorized two-wheeled vehicle tire for traveling on uneven terrain wherein multiple blocks are provided on the tread at intervals in the tire circumference direction. Recesses are provided on the bottom surfaces of the grooves. Multiple recesses are provided at intervals in the axial direction of the tire. Spew, which was drawn up into the vent holes of the mold during vulcanization molding, or removal marks thereof are provided between each recess and the block that is adjacent in the tire circumference direction.
Claims13
A motorcycle tire for traveling on rough terrain, the tire comprising:
- a tread portion being provided with a plurality of blocks protruding radially outwardly from a groove bottom surface and arranged in a circumferential direction of the tire with a space therebetween;
- a plurality of recess portions being provided on the groove bottom surface between a pair of circumferentially adjacent blocks, the recess portions arranged in an axial direction of the tire with a space therebetween, wherein six to ten recess portions are arranged in the axial direction of the tire;
- and
- a spew sucked up a vent hole in a mold during vulcanization molding or its excision mark being provided between each recess portion and the block adjacent to the recess portion in the circumferential direction of the tire.
A tire vulcanization mold comprising a tread molding surface for molding a tread portion of a motorcycle tire for traveling on rough terrain comprising a plurality of blocks protruding radially outwardly from a groove bottom surface and arranged in a circumferential direction of the tire with a space therebetween, the mold comprising:
- the tread molding surface comprising a first portion for molding the groove bottom surface, a plurality of second portions for molding the blocks, and a plurality of projecting third portions provided between a pair of adjacent second portions in the circumferential direction of the tire for molding recess portions on the groove bottom surface, wherein six to ten third portions are provided in the axial direction of the tire;
- the third portions being arranged in an axial direction of the tire with a space therebetween;
- and
- the first portion between one of the second portions and one of the third portions being provided with one end of a vent hole having the other end communicating with the outside of the mold to discharge an air to an outside of the mold during vulcanization.
A motorcycle tire for traveling on rough terrain, the tire comprising:
- a tread portion being provided with a plurality of blocks protruding radially outwardly from a groove bottom surface to a ground contact surface and arranged in a circumferential direction of the tire with a space therebetween;
- a plurality of recess portions being provided on the groove bottom surface between a pair of circumferentially adjacent blocks, the recess portions being recessed radially inwardly from the groove bottom surface and arranged in an axial direction of the tire with a space therebetween;
- and
- a spew sucked up a vent hole in a mold during vulcanization molding or its excision mark being provided between each recess portion and the block adjacent to the recess portion in the circumferential direction of the tire.
A tire vulcanization mold comprising a tread molding surface for molding a tread portion of a motorcycle tire for traveling on rough terrain comprising a plurality of blocks protruding radially outwardly from a groove bottom surface to a ground contact surface and arranged in a circumferential direction of the tire with a space therebetween, the mold comprising:
- the tread molding surface comprising a first portion for molding the groove bottom surface, a plurality of second portions for molding the blocks, and a plurality of projecting third portions provided between a pair of adjacent second portions in the circumferential direction of the tire for molding recess portions on the groove bottom surface;
- the third portions protruding radially outwardly from the first portion and being arranged in an axial direction of the tire with a space therebetween;
- and
- the first portion between one of the second portions and one of the third portions being provided with one end of a vent hole having the other end communicating with the outside of the mold to discharge an air to an outside of the mold during vulcanization.
Dependencies are inferred from the claim text.