Heavy duty tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorTakashi SUGIURA
Life of this patent
Estimating the term…
Abstract
A heavy duty tire can have a tread portion that includes a plurality of circumferential grooves that zigzag, a plurality of lateral grooves connecting between zigzag vertexes of the circumferential grooves, and a plurality of hexagonal blocks formed by the circumferential grooves and the lateral grooves. A groove depth of the circumferential groove can be 21 mm or more. Each of the hexagonal blocks can include a three-dimensional sipe extending across the hexagonal block. The lateral groove can include a raised portion formed by raising a groove bottom of the lateral groove to connect between the hexagonal blocks adjacent to each other in the tire circumferential direction.
Claims20
A heavy duty tire comprising:
- a tread portion, wherein the tread portion includes:
- a plurality of circumferential grooves zigzagging in a tire circumferential direction so as to form zigzag vertexes,
- a plurality of lateral grooves connecting between the zigzag vertexes of the circumferential grooves adjacent to each other in a tire axial direction, and
- a plurality of hexagonal blocks formed by the circumferential grooves adjacent to each other in the tire axial direction and the plurality of lateral grooves,
- wherein the plurality of circumferential grooves each have a groove depth of 21 mm or more,
- wherein each of the plurality of hexagonal blocks comprises a three-dimensional sipe zigzagging in the tire axial direction and a tire radial direction and extending across the corresponding hexagonal block, and
- wherein each of the plurality of lateral grooves comprises a raised portion formed by raising a groove bottom of the corresponding lateral groove to connect between the hexagonal blocks adjacent to each other in the tire circumferential direction.
A heavy duty tire comprising:
- a tread portion, wherein the tread portion includes:
- a plurality of circumferential grooves zigzagging in a tire circumferential direction so as to form zigzag vertexes,
- a plurality of lateral grooves connecting between the zigzag vertexes of the circumferential grooves adjacent to each other in a tire axial direction, and
- a plurality of hexagonal blocks formed by the circumferential grooves adjacent to each other in the tire axial direction and the plurality of lateral grooves,
- wherein the plurality of circumferential grooves each have a groove depth of 21 mm or more,
- wherein each of the plurality of hexagonal blocks comprises a three-dimensional sipe zigzagging in the tire axial direction and a tire radial direction and extending across the corresponding hexagonal block,
- wherein each of the plurality of lateral grooves comprises a raised portion formed by raising a groove bottom of the corresponding lateral groove to connect between the hexagonal blocks adjacent to each other in the tire circumferential direction,
- wherein, in each of the plurality of lateral grooves, a length of the raised portion in the tire axial direction is less than a length of the lateral groove in the tire axial direction,
- wherein, in each of the plurality of lateral grooves, the length of the raised portion in the tire axial direction is 0.4 to 0.6 times the length of the lateral groove in the tire axial direction,
- wherein, in each of the plurality of lateral grooves, a groove depth at the raised portion is 0.5 to 0.8 times a groove depth of each circumferential groove to which the lateral groove is connected,
- wherein a depth of each three-dimensional sipe is 0.5 to 0.8 times a groove depth of each circumferential groove to which the three-dimensional sipe is connected,
- wherein each of the plurality of lateral grooves comprises a pair of groove walls, and a pair of groove edges located at positions at which the pair of groove walls and a tread surface of the hexagonal blocks intersect each other,
- wherein each of the pair of groove walls is inclined at an angle from 3° to 8° relative to a normal line passing through a corresponding one of the pair of groove edges so as to be normal to the tread surface, and wherein each of the plurality of lateral grooves has a groove width of 7 to 9 mm.
Dependencies are inferred from the claim text.