Pneumatic tire
AssigneeBridgestone Corporation
InventorNaoya Ochi
Life of this patent
Estimating the term…
Abstract
The present invention provides a pneumatic tire capable of exhibiting improved on-snow cornering performance on a snowy road and improved on-ice cornering performance on an icy road surface. Specifically, the pneumatic tire comprises: a tread portion (1) including a ground contact surface (5) to be brought into contact with a road surface when the tire is rotated; a pair of sidewall portions (3) forming side surfaces of the tire and extending from the tread portion (1) toward the inner side in the tire radial direction, respectively; and buttress portions each forming an outer surface region (7) ranging from an end portion in the width direction of the ground contact surface (5) to the corresponding sidewall portion (3), wherein polygonal blocks (11) are formed in the outer surface region (7) by demarcation by grooves (9).
Claims17
A pneumatic tire, comprising:
- a tread portion including a ground contact surface to be brought into contact with a road surface when the tire is rotated;
- a pair of sidewall portions forming side surfaces of the tire and extending from the tread portion toward the inner side in the tire radial direction, respectively;
- buttress portions each forming an outer surface region ranging from an end portion in the width direction of the ground contact surface to the corresponding sidewall portion;
- a lateral groove formed in the buttress portion;
- and
- a lug groove provided in the ground contact surface of the tread portion communicating with the lateral groove,
- wherein polygonal blocks are formed in the outer surface region by demarcation grooves, and
- wherein a groove width of the lateral groove is larger than a groove width of the lug groove,
- wherein a first auxiliary groove extending in the tire width direction is formed in an outer surface of each polygonal block, the first auxiliary groove having a groove depth less than the demarcation groove.
A pneumatic tire, comprising:
- a tread portion including a ground contact surface to be brought into contact with a road surface when the tire is rotated;
- a pair of sidewall portions forming side surfaces of the tire and extending from the tread portion toward the inner side in the tire radial direction, respectively;
- and
- buttress portions each forming an outer surface region ranging from an end portion in the width direction of the ground contact surface to the corresponding sidewall portion,
- wherein polygonal blocks are formed in the outer surface region by demarcation grooves, and
- wherein a first auxiliary groove extending in the tire width direction is formed in an outer surface of each polygonal block, the first auxiliary groove having a groove depth less than the demarcation groove.
A pneumatic tire, comprising:
- a tread portion including a ground contact surface to be brought into contact with a road surface when the tire is rotated;
- a pair of sidewall portions forming side surfaces of the tire and extending from the tread portion toward the inner side in the tire radial direction, respectively;
- and
- buttress portions each forming an outer surface region ranging from an end portion in the width direction of the ground contact surface to the corresponding sidewall portion,
- wherein polygonal blocks are formed in the outer surface region by demarcation grooves,
- wherein demarcation grooves of one of the polygonal blocks communicate with demarcation grooves of an adjacent one of the polygonal blocks in the tire circumferential direction by a communication portion having a groove width larger than the demarcation grooves.
Dependencies are inferred from the claim text.