Pneumatic tire having blocks with plural transverse sipes at different depths
AssigneeBridgestone Corporation
InventorHiroshi Kojima
Life of this patent
Estimating the term…
Abstract
To improve biased abrasion or traction and brake performance of a pneumatic tire formed with a great number of blocks partitioned by the main circumferential grooves and transverse grooves on the tread thereof, each of the block is formed with at least three sipes arranged regular intervals along the tire circumferential direction and extending over an entire width of each block along the tire transverse direction in such a way that at least one end of each sipe is open to the main circumferential groove and a central sipe of each block is formed the deepest as compared with other side sipes.
Claims13
A pneumatic tire of toroidal shape comprising:
- a cylindrical tread portion and a pair of side wall portions extending from both ends of the tread radially inward, the cylindrical tread portion comprising:
- (a) a plurality of main circumferential grooves arranged at substantially regular intervals along the transversal direction of the tire;
- (b) a plurality of transverse grooves extending across said main circumferential grooves and arranged at substantially regular intervals along the circumferential direction of tire;
- (c) a plurality of blocks partitioned by said main circumferential grooves and said transverse grooves, each of said blocks being formed with at least three sipes arranged at substantially regular intervals along the tire circumferential direction and extending substantially over an entire width of each block in the tire transverse direction in such a way that at least one end of each sipe is open to one of said main circumferential grooves and a central sipe of each block is formed the deepest as compared to the other side sipes, wherein rigidity of each block is uniform in the circumferential direction of the tire to provide a uniform contact pressure distribution against the ground to prevent abrasion at both side ends of said blocks.
Dependencies are inferred from the claim text.