Patent ID: 11912069
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 0:
1. A tire comprising: 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,
the two tread ends are ends of a 50%-load ground-contact surface obtained when the tire is fitted on a normal rim with a normal internal pressure, 50% of a normal load is applied to the tire, and the tread portion is brought into contact with a flat surface at a camber angle of 0°,
each of the five land portions has no groove having a groove width greater than 2.0 mm, and includes only sipes,
the five land portions include at least one shoulder land portion including the tread end,
the four circumferential grooves include a shoulder circumferential groove adjacent to the shoulder land portion,
the five land portions include a middle land portion adjacent to the shoulder circumferential groove,
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 a tire axial direction, and an axial portion having an angle with respect to the tire axial direction smaller than the inclined portion and not greater than 10°,
the axial portion crosses the tread end,
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 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,
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,
the middle land portion has a plurality of middle sipes fully traversing the middle land portion in a tire axial direction and inclined relative to the tire axial direction, and
a distance in the tire circumferential direction from an end on the shoulder circumferential groove side of one of the plurality of middle sipes to an end on the shoulder circumferential groove side of the shoulder sipe is 30% to 50% of a one-pitch length in the tire circumferential direction of the plurality of middle sipes.