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

Claim 18:
19. The tire according to claim 2, wherein
the tread portion has a designated mounting direction on a vehicle,
the first tread edge is located on an outer side of the vehicle when the tire is mounted on the vehicle,
the five land portions comprise a crown land portion adjacent to the first middle land portion at the second tread edge side and a second middle land portion adjacent to the crown land portion at the second tread edge side, the crown land portion being located on the tire equator,
in a 50%-loaded-state where the tire is mounted on a standard wheel rim with a standard inner pressure, 50% of a standard tire load is applied to the tire, and the tire is grounded on a plane at zero camber angles, when maximum widths in the tire axial direction of ground contact surfaces of the first middle land portion, the crown land portion and the second middle land portion are respectively denoted by W1m, Wc and W2m, the following formula (1) is satisfied:

W1m>Wc>W2m  (1),

the crown land portion comprises a first longitudinal edge extending in the tire circumferential direction on the first tread edge side, a second longitudinal edge extending in the tire circumferential direction on the second tread edge side, and a ground contact surface between the first longitudinal edge and the second longitudinal edge,
the crown land portion is provided with a plurality of first crown sipes each extending from the first longitudinal edge and having a closed end within the ground contact surface, and a plurality of second crown sipes each extending from the second longitudinal edge and having a closed end within the ground contact surface,
each of the plurality of first crown sipes and the plurality of second crown sipes comprises a pair of sipe edges,
at least one of the pair of sipe edges of at least one first crown sipe opens at the ground contact surface of the crown land portion via a chamfer portion over an entire length thereof,
the chamfer portion of the at least one first crown sipe has a chamfer width decreasing from the first longitudinal edge of the crown portion to the closed end thereof continuously,
at least one of the pair of sipe edges of at least one second crown sipe opens at the ground contact surface of the crown land portion via a chamfer portion over an entire length thereof,
the chamfer portion of the at least one second crown sipe has a chamfer width decreasing from the second longitudinal edge of the crown portion to the closed end thereof continuously,
in each first middle sipe, a chamfer width of an end portion on the second longitudinal edge side of the first middle land portion is in a range from 1.2 to 1.8 times a chamfer width of an end portion on the first longitudinal edge side of the first middle land portion, and
in each second middle sipe, a chamfer width of an end portion on the first longitudinal edge side of the second middle land portion is in a range from 1.2 to 1.8 times a chamfer width of an end portion on the second longitudinal edge side of the second middle land portion.