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

Claim 14:
15. 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
the tread pattern comprises a plurality of lug grooves provided at an interval in the tire circumferential direction, the plurality of lug grooves connecting the pair of circumferential main grooves with each other,
each of the plurality of lug grooves comprises:
a pair of inclined groove portions approaching each other while advancing from connection ends of the pair of circumferential main grooves to the first side in the tire circumferential direction; and
a groove turning portion connecting ends of the pair of inclined groove portions with each other and being bent to protrude to the first side in the tire circumferential direction,
the land portion is formed of a plurality of block land portions divided by the plurality of lug grooves in the tire circumferential direction, and
in a region of each of the plurality of block land portions, two of the plurality of sipes are provided as a first sipe and a second sipe,
the groove turning portion is provided with a raised groove bottom portion having a groove depth shallower than a groove depth of the pair of inclined groove portions,
the first sipe is provided on the first side relative to the second sipe, and
a first position of a protrusion end of the sipe turning portion of the first sipe in the tire lateral direction, which protrudes most to the first side, is present in a raised bottom portion range in the tire lateral direction in which the raised groove bottom portion is provided and is present inward in the tire lateral direction relative to a second position of a protrusion end of the sipe turning portion of the second sipe in the tire lateral direction, which protrudes most to the first side,
in the region of each of the plurality of block land portions, a region between the first sipe and the second sipe in the tire circumferential direction is provided with a third sipe having a terminal end in the raised bottom portion range in the tire lateral direction, the third sipe extending, at an inclination with respect to the tire lateral direction, outward in the tire lateral direction from the inner circumferential main groove, along at least one of the pair of inclined sipe portions of the first sipe and the second sipe extending from the inner circumferential main groove.