Patent ID: 9150053
Filing Date: 2015-10-06
Classification: B60C

Abstract:
1. A pneumatic tire comprising a tread portion having a tread surface and tread edges, a pair of bead portions, and a pair of sidewall portions extending between the tread portion and the bead portions and each having a buttress part as its radially outermost part extending radially inwardly from the tread edge, the surface of the buttress part provided with a row of protrusions arranged circumferentially of the tire, wherein each said protrusion has (a) a radially outside wall surface rising from the surface of the buttress part, (b) a radially inside wall surface rising from the surface of the buttress part, and a top surface extending between the radially inside wall surface and the radially outside wall surface, wherein the radially outside wall surface starts to rise from the surface of the buttress part at a certain distance from the tread edge so that the minimum radial distance Kmin from the tread edge to the protrusion is in a range of from 5 to 15 mm, the radially inside wall surface is provided in its circumferential central part with an indentation denting toward the radially outside so that the protrusion is provided with a minimum width portion where a radial width (W) of the protrusion is minimum and the radial width (W) of the protrusion increases stepwisely or alternatively smoothly from the minimum width portion toward each end of the protrusion in the circumferential direction, said each end of the protrusion being spaced apart from a lateral groove circumferentially adjacent to the axially outermost block, and a circumferential length (L) of the protrusion being more than the radial width (W) so that the protrusion has a circumferentially long shape, and the tread portion is provided with axially outermost blocks which are arranged along each said tread edge and of which axially outer side walls each define a part of said surface of the buttress part, and each said protrusion is disposed within one of the axially outer side walls and has an angle θ in a range of from 90 to 45 degrees between its radially inside wall surface and the surface of the buttress part.