Patent ID: 11970027
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 includes a first land portion demarcated by a pair of circumferential grooves continuously each extending in a tire circumferential direction, and a plurality of first lateral grooves each inclined in a first direction relative to a tire axial direction and traversing the first land portion,
the first land portion includes a plurality of first blocks demarcated by the first lateral grooves,
each said first block has at least one sipe inclined in a second direction opposite to the first direction, relative to the tire axial direction,
each said at least one sipe includes a plurality of first portions each deeper than a maximum depth of each said first lateral groove, and a plurality of second portions each shallower than the maximum depth of each said first lateral groove,
each said at least one sipe includes a plurality of tie bar portions that are raised outwardly in a tire radial direction from a bottom of the sipe,
the plurality of tie bar portions include a first tie bar portion, a second tie bar portion, and a third tie bar portion between the first and second tie bar portions,
a width of the third tie bar portion is less than a width of each of the first and second tie bar portions,
a height of the third tie bar portion in the tire radial direction is less than a height of each of the first and second tie Tar portions in the tire radial direction,
wherein the first lateral grooves extend from one of the pair of circumferential grooves to the other of the pair of circumferential grooves so as to completely demarcate the first blocks,
wherein at least some of the sipes per block extend from one of the pair of circumferential grooves to the other of the pair of circumferential grooves,
wherein a maximum depth of each of the plurality of first portions, deeper than the maximum depth of each said first lateral groove, of each said at least one sipe, is 105% to 145% of the maximum depth of each said first lateral groove, and
wherein a minimum depth of each of the plurality of second portions, shallower than the maximum depth of each said first lateral groove, of each said at least one sipe, is 30% to 70% of the maximum depth of each said first lateral groove.