Pneumatic tire including axial grooves
AssigneeSumitomo Rubber Industries, Ltd.
InventorSatoshi Tsuda
Life of this patent
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Abstract
A pneumatic tire comprises a tread portion provided with a longitudinal main groove extending continuously in the tire circumferential direction and axial grooves each having at least one opening into the longitudinal main groove, and at least one of two groove walls of each of the axial grooves swells gradually towards the opening. The axial grooves include a groove having two openings and/or a groove having one opening and one closed end. The swelling part of the groove wall can be formed by a convexly curved surface extending from the tread surface towards the groove bottom, and having a single radius of curvature gradually decreasing towards the opening.
Claims7
A pneumatic tire comprising a tread portion provided with
- at least one longitudinal main groove extending continuously in the tire circumferential direction, and
- axial grooves each having at least one opening into said at least one longitudinal main groove, wherein
- at least one of two groove walls of each of the axial grooves gradually swells towards said at least one opening,
- in a cross section of the axial groove, the swelling part of the groove wall has a convexly curved surface extending from the tread surface to a depth L in the range of not less than 60% of the depth H of the axial groove, and
- said convexly curved surface has a radius of curvature gradually decreasing towards said at least one opening.
Dependencies are inferred from the claim text.