V-ribbed belt
A V-ribbed belt having an elastic main body constructed from at least one rubber mixture including an outer ply as a belt backing and a substructure having a ribbed force-transmitting side. To improve friction and optimize service life the V-ribbed belt has a coating made of a knitted fabric on its force-transmitting side, in which the average basis weight of the textile before vulcanization is between 140 and 190 g/m 2 .
1. A V-ribbed belt having an elastic main body constructed from at least one rubber mixture comprising an outer ply as a belt backing and a substructure having a ribbed force-transmitting side, wherein the ribbed force-transmitting side has a textile overlay including a knitted fabric, wherein the average basis weight of the textile before vulcanization is 140 g/m 2 to 190 g/m 2 , and wherein the basis weight of the textile was determined according to DIN EN 12127, version 1997-12, wherein the ribbed force-transmitting side has coefficient of friction value between 1.45 and 1.85 as determined according to SAE J 2432.
2. The V-ribbed belt according to claim 1 , wherein the average basis weight of the textile before vulcanization is 140 g/m 2 to 170 g/m 2 .
3. The V-ribbed belt according to claim 1 , wherein the knitted fabric is composed of a combination of a multifilament yarn made of polyamide and an elastic thread.
4. The V-ribbed belt according to claim 3 , wherein the polyamide is PA 6 or PA 6.6.
5. The V-ribbed belt according to claim 3 , wherein the elastic thread is composed of polyurethane.
6. The V-ribbed belt according to claim 1 , wherein ethylene-propylene rubber (EPM) or ethylene-propylene-diene rubber (EPDM) or a combination of EPM and EPDM is employed as the rubber for the rubber mixture of the substructure.
7. The V-ribbed belt according to claim 1 , wherein the rib depth is between 2.2 and 2.6 mm.
8. The V-ribbed belt according to claim 1 , wherein the textile overlay is an open-pored knitted fabric.
9. The V-ribbed belt according to claim 8 , wherein the knitted fabric is a single jersey.
10. The V-ribbed belt according to claim 1 , wherein the textile overlay is knitted in a plated manner.
11. The V-ribbed belt according to claim 1 , wherein:
the knitted fabric is composed of a combination of a multifilament yarn made of polyamide and an elastic thread,
the polyamide is PA 6 or PA 6.6,
the elastic thread is composed of polyurethane and has an elongation at break according to DIN EN ISO 2062:1995 of more than 100%, and
the rib depth is between 2.2 and 2.6 mm.
12. The V-ribbed belt according to claim 1 , wherein the textile overlay is a plated knitted fabric having polyamide yarns arranged in a first facing direction and elastane yarns arranged in a second facing direction opposite the first facing direction, and wherein the second facing direction with the elastane yarns is facing outwardly.
13. The V-ribbed belt according to claim 12 , wherein a weight fraction of the elastane yarns in the textile covering is between 8% and 16% by weight, and a weight fraction of the polyamide yarns is between 84% and 92% by weight.
14. The V-ribbed belt according to claim 13 , wherein the textile overlay has an open-pore structure, and a surface area of the force-transmitting zone is covered by threads of the textile covering to an extent of less than 40% based on the total surface area of the force-transmitting zone.