Traction device, traction system incorporating said traction device and an elevator arrangement incorporating said traction system

Abstract

A traction device includes tension members () coated with an elastomer material to form jacketed tension members (). The jacketed tension members () are arranged next to each other in a plane in the cross section of the traction device, at such a distance from each other that there is a clear space () between each two mutually adjacent ones of the jacketed tension members (). The jacketed tension members () are connected at the back thereof by a back layer. The clear space () begins on the side facing away from the back layer () and extends at least beyond the center point () of the tension member, and the ratio of the second diameter (d) of the jacketed tension member () in relation to the first diameter (d) of the tension member () is between 1.05 and 2.25. The invention is also directed to a traction system which includes the traction device which can be driven by at least one traction sheave (), and each jacketed tension member () engages in a corresponding groove () of the traction sheave (). The back layer () is arranged on the side of the jacketed tension members () that faces away from the side engaging in the grooves () of the traction sheave (). At least one tension member () engages in the corresponding groove () of the traction sheave () by between 5% and 25% of its diameter (d).