Patent ID: 11904636
Assignee: BRIDGESTONE CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 0:
1. A pneumatic tire comprising, on a tread surface, a plurality of circumferential main grooves extending in a tire circumferential direction, and a plurality of land portions defined between circumferential main grooves adjacent in a tire width direction among the plurality of circumferential main grooves or by the circumferential main grooves and tread edges, wherein
the land portions include at least one circumferential sipe extending in the tire circumferential direction,
at a first position of the circumferential sipe in the tire circumferential direction, from the tread surface towards a sipe bottom, a sipe width gradually decreases from the tread surface to a first changing point and then gradually increases from the first changing point to the sipe bottom,
at a second position of the circumferential sipe in the tire circumferential direction, from the tread surface towards the sipe bottom, the sipe width gradually increases from the tread surface to a second changing point and then gradually decreases from the second changing point to the sipe bottom, and
the sipe width at the tread surface and at the sipe bottom gradually decreases in the tire circumferential direction from the first position towards the second position, and the sipe width in an intermediate portion in a tire radial direction gradually increases in the tire circumferential direction from the first position towards the second position.