Pneumatic tire
AssigneeThe Yokohama Rubber Co., Ltd.
InventorMasatoshi Kuwajima
Life of this patent
Estimating the term…
Abstract
A pneumatic tire including a closed sipe in a land portion 3 formed in a tread surface, provided with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion. The cuts are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, and a twist angle thereof is not less than 10° and not more than 135°. Additionally, a length in the radiation direction of the cuts or a width of the cuts is formed larger at a tread surface side than at a bottom surface side.
Claims18
A pneumatic tire comprising:
- a land portion formed in a tread surface;
- and a closed sipe provided in the land portion with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion, wherein the cuts of the closed sipe are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, wherein
- a twist angle of the cuts from a top surface to a bottom surface of the land portion is not less than 10° and is not more than 120°, and a length in the radiation direction of the cuts is formed longer at a tread surface side than at a bottom surface side in a depth direction of the closed sipe.
A pneumatic tire comprising:
- a land portion formed in a tread surface;
- and a closed sipe provided in the land portion with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion, wherein the cuts of the closed sipe are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, wherein
- a twist angle of the cuts from a top surface to a bottom surface of the land portion is not less than 10° and is not more than 120°, and a length L1 in the radiation direction at the tread surface of the cuts is formed longer than a length L2 in the radiation direction at the bottom surface in a depth direction of the closed sipe, and a relationship between the length L2 and the length L1 is configured to be 0.05≦L2/L1≦0.5.
A pneumatic tire comprising:
- a land portion formed in a tread surface;
- and a closed sipe provided in the land portion with at least three cuts extending in a radiation direction from an imaginary axis that extends in a depth direction of the land portion, and that terminate in the land portion, wherein the cuts of the closed sipe are provided with a spiral-like twist in the depth direction, centered on the imaginary axis, wherein
- a twist angle of the cuts from a top surface to a bottom surface of the land portion is not less than 10° and is not more than 120°, and a length in the radiation direction of the cuts is formed longer at a tread surface side than at a bottom surface side in a depth direction of the closed sipe, and a relationship between a width W2 at the bottom surface and a width W1 at the tread surface of the cuts is configured to be 1.5≦W1/W2≦5.0.
Dependencies are inferred from the claim text.