Adjustless V-belt and method of manufacturing

Claim 1

An adjustable V-belt, comprising: a compressive rubber layer; and adhesion rubber layer laminated on the upper surface of said compressive rubber layer; a group of first cogs protruding from said adhesion rubber, said first cogs having a predetermined depth and arranged at a predetermined pitch; a cover canvas covering said first cogs and roots between said first cogs; said cover canvas covering comprising an elastic canvas obtained by weaving curled nylon warps subjected to woolly treatment and ordinary wefts; whereby said cover canvas covering is elastic in one direction; rope tensile members embedded between said adhesion rubber layer and said group of first cogs with a regular pitch line in such a manner that said tensile members form substantially a cylinder and parts of said tensile members are in contact with said cover canvas, said rope tensile members having a thermal contraction stress of at least 3.5 g/denier which is the difference between a thermal contraction stress at 100° C. and that at room temperature; short fibers embedded laterally in said compressive rubber layer; a group of second cogs formed on the lower surface of said compressive rubber layer; and wherein the pitch and depth of said group of first cogs are defined by: 1.5t<p<3.5t 0.12d<t<0.4d, where: p is the pitch of said group of first cogs, t is the depth of said group of first cogs, and d is the thickness of said V-belt.