Tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorNaofumi Kitani
Life of this patent
Estimating the term…
Abstract
A tire comprises a tread portion 2 provided with a first main groove 3 and a second main groove 4 each extending in a zigzag manner and a land region 10 defined between them. The land region 10 is provided with a longitudinal sipe 15 extending in a zigzag manner in the tire circumferential direction, first lug grooves 16, and second lug grooves 17. The land region 10 comprises first blocks 21 divided by the longitudinal sipe 15 and the first lug grooves 16, and second blocks 22 divided by the longitudinal sipe 15 and the second lug grooves 17. Each of the first blocks 21 and the second blocks 22 is provided with not less than three transverse sipes 25 extending across the entire width of the each of the first blocks 21 and the second blocks 22.
Claims17
A tire comprising:
- a tread portion being provided with a first main groove and a second main groove each extending continuously in a zigzag manner in the tire circumferential direction and a land region defined between the first main groove and the second main groove;
- the land region being provided with a longitudinal sipe extending in a zigzag manner in the tire circumferential direction, a plurality of first lug grooves extending between the longitudinal sipe and the first main groove, and a plurality of second lug grooves extending between the longitudinal sipe and the second main groove,
- the land region comprising a plurality of first blocks defined by the longitudinal sipe and the plurality of the first lug grooves, and a plurality of second blocks defined by the longitudinal sipe and the plurality of the second lug grooves;
- each of the first blocks and the second blocks being provided with not less than three transverse sipes extending across the entire width of the each of the first blocks and the second blocks:
- at least one of the first lug grooves is inclined with respect to the tire axial direction
- at least one of the second lug grooves is parallel with the tire axial direction;
- and
- the second lug grooves are provided at different positions in the tire circumferential direction with respect to the first lug grooves such that each of the second lug grooves does not overlap in the tire circumferential direction with any one of the first grooves when viewed along a straight line in the tire axial direction;
- wherein, the first main groove comprises a first groove portion inclined with respect to the tire circumferential direction, a second groove portion inclined to an opposite direction to the first groove portion and connected with the first groove portion, a third groove portion inclined to an opposite direction to the second groove portion and connected with the second groove portion, and a fourth groove portion inclined to an opposite direction to the third groove portion and connected with the third groove portion, and each of the first groove portion, the second groove portion, the third groove portion, and the fourth groove portion has a different angle with respect to the tire circumferential direction from each other;
- wherein the longitudinal sipe comprises
- a first sipe portion inclined with respect to the tire circumferential direction,
- a second sipe portion inclined to an opposite direction to the first sipe portion and connected with the first sipe portion,
- a third sipe portion inclined to an opposite direction to the second sipe portion and connected with the second sipe portion, and
- a fourth sipe portion inclined to an opposite direction to the third sipe portion and connected with the third sipe portion;
- wherein each of the first sipe portion, the second sipe portion, the third sipe portion, and the fourth sipe portion has a different angle with respect to the tire circumferential direction from each other:
- and
- wherein each of the first sipe portion, the second sipe portion, the third sipe portion, and the fourth sipe portion of the longitudinal sipe is inclined at an angle larger than each of the first groove portion, the second groove portion, the third groove portion, and the fourth groove portion of the first main groove with respect to the tire circumferential direction.
Dependencies are inferred from the claim text.