Patent ID: 11872845
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A tire comprising:
a tread portion, wherein
the tread portion comprises a first tread edge, a second tread edge, four circumferential grooves extending continuously in a tire circumferential direction between the first tread edge and the second tread edge, and five land portions divided by the four circumferential grooves,
the five land portions comprise a first middle land portion located between the first tread edge and a tire equator,
the first middle land portion comprises a first longitudinal edge extending in the tire circumferential direction on a first tread edge side, a second longitudinal edge extending in the tire circumferential direction on a second tread edge side, and a ground contact surface between the first longitudinal edge and the second longitudinal edge,
the first middle land portion is provided with a plurality of first middle sipes inclined at an angle with respect to a tire axial direction and fully traversing the first middle land portion in the tire axial direction,
each of the plurality of first middle sipes comprises a pair of sipe edges,
at least one of the pair of sipe edges opens at the ground contact surface via a chamfer portion over an entire length thereof,
the chamfer portion has a chamfer width increasing from the first longitudinal edge to the second longitudinal edge continuously,
the four circumferential grooves comprise a first shoulder circumferential groove located nearest to the first tread edge among the four circumferential grooves,
the five land portions comprise a first shoulder land portion having the first tread edge and adjacent to the first middle land portion via the first shoulder circumferential groove,
the first shoulder land portion is provided with a plurality of first shoulder sipes extending from the first shoulder circumferential groove to a location beyond the first tread edge,
at least one of the plurality of first shoulder sipes comprises an inclined portion extending from the first shoulder circumferential groove and inclined with respect to the tire axial direction, and an axial portion having an angle with respect to the tire axial direction smaller than that of the inclined portion and not greater than 10 degrees,
the axial portion crosses the first tread edge,
each of the plurality of first shoulder sipes comprises a pair of first shoulder sipe edges,
at least one of the pair of first shoulder sipe edges opens at a ground contact surface of the first shoulder land portion via a chamfer portion over an entire length thereof,
each of the chamfered portions of the inclined portion and axial portion extends with a respective uniform chamfer width, and
the chamfer width of the chamfered portion of the axial portion is larger than the chamfer width of the chamfered portion of the inclined portion.