Patent ID: 11890897
Assignee: THE YOKOHAMA RUBBER CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A pneumatic tire comprising a tread portion that is provided with a tread pattern, the tread pattern comprising:
a pair of circumferential main grooves comprising an inner circumferential main groove being provided in a first half tread region on one side with respect to a tire equator line in a tire lateral direction and an outer circumferential main groove being provided outward of the inner circumferential main groove in the tire lateral direction;
a land portion being defined by the pair of circumferential main grooves in the tire lateral direction; and
a plurality of sipes provided at an interval in a tire circumferential direction, the plurality of sipes being provided in a region of the land portion and connecting the pair of circumferential main grooves with each other,
each of the plurality of sipes comprising:
a pair of inclined sipe portions approaching each other while advancing from connection ends of the pair of circumferential main grooves to a first side in the tire circumferential direction; and
a sipe turning portion connecting ends of the pair of inclined sipe portions with each other and being bent to protrude to the first side, and, a profile line formed by a tread surface of the land portion being a swelling profile line protruding outward of a standard profile line in a tire radial direction, when an arc passing through two land portion edge points at which the tread surface of the land portion is connected with groove wall surfaces of the pair of circumferential main grooves is set to the standard profile line, in a profile cross-section of the tread portion taken along the tire lateral direction, wherein
when the inner circumferential main groove is a first inner circumferential main groove, and the outer circumferential main groove is a first outer circumferential main groove, a second half tread region on a side opposite to the first half tread region in the tire lateral direction comprises:
a second inner circumferential main groove;
a second outer circumferential main groove being provided outward of the second inner circumferential main groove in the tire lateral direction;
a continuous land portion being defined by the second inner circumferential main groove and the second outer circumferential main groove and present around a circumference in the tire circumferential direction; and
a fourth sipe and a fifth sipe connecting the second inner circumferential main groove and the second outer circumferential main groove with each other, the fourth sipe and the fifth sipe extending to be inclined with respect to the tire lateral direction in a region of the continuous land portion,
each of the fourth sipe and the fifth sipe comprises:
an inner inclined portion provided in a region of the continuous land portion; and
both side inclined portions being provided on both sides of the inner inclined portion in the tire lateral direction and being connected with the second inner circumferential main groove and the second outer circumferential main groove, and
an inclination angle of the inner inclined portion with respect to the tire lateral direction is larger than an inclination angle of both the side inclined portions with respect to the tire lateral direction.