Adjustless V-belt and method of manufacturing

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.degree. 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.