Abstract: A V-belt construction (10) utilizing one or more layers (19) of transverse cord fabrics in the compression section (17) thereof. The fabric cord layers are embedded in cushion rubber provided with short transverse reinforcing fibers and are laid down in a serpentine manner so as to follow the valleys and peaks of the cog portions (16) of the belt, with the layers being spaced apart in the peak portions (22) of the cogs and closely juxtaposed in the valley portions (21) thereof.

Abstract: A power transmission belt (10,21) of improved manufacture wherein a novel reinforcing fabric (4,14) is provided in the inner portion of the compression section (3,13) of the belt. The fabric is formed of yarns (20) having a low coefficient of thermal contraction and a high bias elongation to break. The yarns are formed of a mixture of natural and synthetic resin fibers and are subjected to heat treatment to effect the improved low coefficient of thermal contraction and high bias elongation to break.

Abstract: A cross-grooved banded drive belt wherein a plurality of V-belt elements are retained in laterally spaced relationship by a tie band. The V-belt elements are provided with transverse grooves which, in the illustrated embodiment, are aligned across the belt and arranged in sets spaced longitudinally of the belt. The grooves are asymmetrical in longitudinal section and in the illustrated embodiment, include planar, leading, and trailing surfaces. In the illustrated embodiment, the leading groove surfaces have a greater length than that of the trailing surfaces. As a result of the transverse alignment of the grooves of each set, the leading surfaces are effectively coplanar with each other and the trailing surfaces are effectively coplanar with each other. Illustrative ranges of the angularity of the groove surfaces are disclosed. In one form, the sets of grooves are uniformly longitudinally spaced, and in another form, the sets of grooves are randomly differently spaced.

Abstract: A power transmission belt (10,21) of improved manufacture wherein a novel reinforcing fabric (4,14) is provided in the inner portion of the compression section (3,13) of the belt. The fabric is formed of yarns (20) having a low coefficient of thermal contraction and a high bias elongation to break. The yarns are formed of a mixture of natural and synthetic resin fibers and are subjected to heat treatment to effect the improved low coefficient of thermal contraction and high bias elongation to break.