Abstract: Power transmission belts are disclosed that have a body made of a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth. The back, ribs, or the teeth are covered by a covering material of woven fabric, knitted fabric, and non-woven fabric, which is treated with a treatment composition that includes polyurethane, polytetrafluoroethylene, and polycarbodiimide.

Abstract: A power transmission belt having a body made of a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth. The back or the ribs or the teeth are covered by a covering material chosen from the group composed of woven fabric and knitted fabric. The covering material includes elastolefin fibres, and preferably at least one elastolefin thread.

Abstract: A transmission belt has a body of a first elastomeric material, a plurality of cords, and a plurality of V-shaped ribs. The V-shaped ribs are arranged side by side and alternate with V-shaped grooves. The V-shaped ribs extend along the transversal axis of the belt. The belt has a first toothing and a second toothing formed by a plurality of teeth that extend obliquely to the transversal axis of the belt, thereby forming therewith respective helix (alpha, beta) angles different from 0°. Power transmission systems that include such a transmission belt are disclosed.

Abstract: Poly-V belt comprising a body made of elastomeric material, preferably EPDM, a plurality of threadlike resistant inserts longitudinally embedded in the body, and a coupling portion integrally connected to the body and comprising a plurality of V-shaped ribs arranged side by side and alternated with V-shaped grooves. According to the present invention the belt comprises a layer of a thermoplastic material which covers the ribs at least partially, and a layer of elastomeric material in which a knitted fabric is embedded. The layer of elastomeric material is above and in contact with the thermoplastic material.

Abstract: Poly-V belt comprising a body made of elastomeric material, preferably EPDM, a plurality of threadlike resistant inserts longitudinally embedded in the body, and a coupling portion integrally connected to the body and comprising a plurality of V-shaped ribs arranged side by side and alternated with V-shaped grooves. According to the present invention the belt comprises a layer of a thermoplastic material which covers the ribs at least partially, and a layer of elastomeric material in which a knitted fabric is embedded. The layer of elastomeric material is above and in contact with the thermoplastic material.