Patent ID: 11904635
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 0:
1. A tire comprising a tread portion, wherein
the tread portion includes four circumferential grooves continuously extending in a tire circumferential direction between two tread ends, and five land portions demarcated by the four circumferential grooves,
each of the four circumferential grooves extends straight along the tire circumferential direction and has a constant width in a tire axial direction,
each of the five land portions has no groove having a groove width greater than 2.0 mm, and includes only sipes,
the four circumferential grooves include a shoulder circumferential groove closest to the tread end,
the five land portions include at least one shoulder land portion including the tread end, and a middle land portion adjacent to the shoulder land portion via the shoulder circumferential groove,
the middle land portion has a plurality of middle sipes fully traversing the middle land portion in the tire axial direction and inclined relative to the tire axial direction,
the shoulder land portion has a plurality of shoulder sipes each extending from the shoulder circumferential groove to a position beyond the tread end,
at least one of the shoulder sipes includes an inclined portion extending from the shoulder circumferential groove and inclined relative to the tire axial direction,
each middle sipe is inclined relative to the tire axial direction in a direction opposite to the inclined portion,
a maximum angle of the inclined portion with respect to the tire axial direction is not greater than a maximum angle of the middle sipe with respect to the tire axial direction,
a difference between the maximum angle of the inclined portion and the maximum angle of the middle sipe is not greater than 5°,
the tire has a designated mounting direction on a vehicle,
the at least one shoulder land portion includes a first shoulder land portion located on an outer side of the vehicle when the tire is mounted on the vehicle, and a second shoulder land portion located on an inner side of the vehicle when the tire is mounted on the vehicle,
the shoulder sipe includes an axial portion having an angle with respect to the tire axial direction smaller than that of the inclined portion,
the first shoulder land portion has a plurality of shoulder termination sipes extending from the shoulder circumferential groove and terminating without reaching the tread end,
each shoulder termination sipe extends inclined in a same direction as the inclined portion and terminates on an inner side in the tire axial direction with respect to the axial portion,
a number of the shoulder sipes on the second shoulder land portion is larger than a number of the shoulder sipes on the first shoulder land portion, and
the first shoulder land portion includes only the shoulder sipes and the shoulder termination sipes, and the second shoulder land portion includes only the shoulder sipes.