Patent ID: 6176284
Filing Date: 2001-01-23
Classification: B60C,Y10S

Abstract:
A pneumatic tire comprisinga tread portion with a block tread pattern,said tread portion being provided with a mesh of grooves to define a plurality of blocks consisting of shoulder blocks adjacent to tread edges and central blocks other than said shoulder blocks,each said central block being surrounded by at least one projection,said at least one projection being disposed in said mesh of grooves and projecting from a bottom of said grooves and being spaced from the groove walls,each said at least one projection comprising a continuous series of alternating main portions and coupler portions, said main portions being relatively wider than said coupler portions,a height H1 of said main portions being in the range of from 10 to 25% of a depth GH of one of said grooves,a height H2 of said coupler portions being in the range of from 5 to 10% of the groove depth GH,a length L1 of each of said main portions being in the range of from 3 mm to 10 mm,a length L2 of each of said coupler portions being in the range of from 2 mm to 8 mm, anda width W2 of said coupler portions being in the range of from 0.5 mm to 2 mm,said main portions comprises first main portions and second main portions, said first main portions being disposed between junctions D of said grooves and being relatively taller than said second main portions.