Patent ID: 11878554
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 15:
16. A tyre comprising:
a tread portion being provided with a middle land portion, a shoulder land portion, and a shoulder circumferential groove extending between the middle land portion and the shoulder land portion, wherein
the middle land portion is provided with two or more full-opened middle sipes,
the middle sipes are inclined with respect to a tyre axial direction,
the middle sipes each have two opposite sipe-edge portions provided with chamfer portions,
in each chamfer portion of each middle sipe, chamfer widths at both ends in a sipe longitudinal direction of the middle sipe are larger than a chamfer width of a central portion in the sipe longitudinal direction of the middle sipe,
each chamfer portion of each middle sipe increases in chamfer width from the central portion to the both ends continuously,
in each middle sipe, chamfer depths at the both ends of the middle sipe are greater than a chamfer depth of the central portion of the middle sipe, and a depth of the middle sipe at an innermost end thereof in the tyre axial direction is greater than a depth of the middle sipe at an outermost end thereof in the tyre axial direction,
the shoulder land portion is provided with two or more shoulder sipes that are inclined in a same direction as the middle sipes with respect to the tyre axial direction,
the shoulder sipes comprise a plurality of full-opened first shoulder sipes and a plurality of semi-opened second shoulder sipes, and
the first shoulder sipes and the second shoulder sipes are not provided with any chamfer portions.