Patent ID: 11958316
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A tire comprising:
a tread portion having a ground contact surface,
the tread portion being provided with a plurality of circumferential grooves extending continuously in a zigzag manner in a tire circumferential direction, each of the plurality of circumferential grooves comprising a groove bottom and a pair of groove walls extending from the groove bottom toward the ground contact surface,
at least one of the plurality of circumferential grooves comprising first inclined elements inclined in a first direction with respect to the tire circumferential direction, second inclined elements inclined in a second direction opposite to the first direction with respect to the tire circumferential direction, and intersections where the first inclined elements and second inclined elements intersect, wherein
each of the first inclined elements and the second inclined elements is provided with at least one first protrusion that projects outwardly in a tire radial direction from the groove bottom and connects the pair of groove walls,
at least one of the intersections is provided with a second protrusion that projects outwardly in the tire radial direction from the groove bottom and is separated from the pair of groove walls, and
in a tread plan view,
the at least one first protrusion has a rectangular shape in which a length La in a groove-width direction is larger than a length Lb in a centerline direction of the at least one circumferential groove,
the rectangular shape has a first edge connecting the pair of groove walls,
an angle between the first edge and a centerline of the at least one circumferential groove is from 80 to 90 degrees, and
the second protrusion has a second edge parallel to the first edge of the at least one first protrusion.