Power transmission belt and related transmission system
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.
1 . A power transmission belt comprising:
a body made of a first elastomeric material, a plurality of cords embedded in the belt body, a back and a plurality of ribs or teeth, said back or said ribs or teeth being covered by a covering material selected from the group consisting of woven fabric, knitted fabric, and non-woven fabric, characterized in that said covering material comprises a treatment comprising polyurethane, polytetrafluoroethylene, polycarbodiimide, and a triethylamine.
2 . The power transmission belt according to claim 1 , wherein said polycarbodiimide is present in an amount by weight relative to the total weight of the treatment of between 0.1 and 20% calculated on the power transmission belt.
3 . The power transmission belt according to claim 1 , wherein the sum of said polytetrafluoroethylene and said polyurethane is an amount between 0.1 and 88% by weight of the treatment calculated on the power transmission belt.
4 . The power transmission belt according to claim 1 , wherein said covering material is a woven fabric.
5 . The power transmission belt according to claim 1 , wherein said belt is a toothed belt.
6 . The power transmission belt according to claim 4 , wherein said woven fabric comprises an elastic thread and at least one thread having high thermal and mechanical resistance.
7 . The power transmission belt according to claim 6 , wherein the thread having high thermal and mechanical resistance is an aromatic polyamide.
8 . The power transmission belt according to claim 1 , wherein said belt is a poly-V belt.
9 . The power transmission belt according to claim 8 , wherein said covering material is a knitted fabric.
10 . The power transmission belt according to claim 9 , wherein said knitted fabric is a warp knitted structure.
11 . The power transmission belt according to claim 9 , wherein said knitted fabric comprises a polyamide yarn.
12 . The power transmission belt according to claim 9 , wherein said knitted fabric comprises at least one polyamide yarn and one polyester or cotton yarn.
13 . A power transmission system of a motor vehicle comprising a belt according to claim 1 .
14 . A process for manufacturing a power transmission belt comprising a body made of a first elastomeric material, a plurality of cords embedded in the belt body, a back and a plurality of ribs or teeth, said back or said ribs or teeth being covered with a covering material selected from the group consisting of woven fabric, knitted fabric, and non-woven fabric, wherein the method comprises:
treating said covering material with a treatment comprising polyurethane, polytetrafluoroethylene, polycarbodiimide, and a triethylamine.
15 . The process of claim 14 , further comprising vulcanizing the power transmission belt after treating said covering material.
16 . The process of claim 14 , wherein treating said covering material comprises adding an aqueous composition comprising the polyurethane, polytetrafluoroethylene and polycarbodiimide to the covering material.
17 . The process of claim 16 , wherein the covering material has a pick-up of the treatment into the fabric in a range of 2 and 80 g/m 2 .
18 . A process for manufacturing a power transmission belt comprising:
a body made of a first elastomeric material,
a plurality of cords embedded in the belt body, and
a back and a plurality of ribs or teeth, said back or said ribs or teeth being covered with a covering material selected from the group consisting of woven fabric, knitted fabric, and non-woven fabric, wherein the method comprises:
treating said covering material with a treatment comprising polyurethane, polytetrafluoroethylene, and polycarbodiimide; and
vulcanizing the power transmission belt after treating said covering material.