Traction and Deflection Pulleys
Flat belt CONTI POLYROPE® shall be applied in combination with a dedicated traction pulley with semicircular grooves. For POLYROPE with flat backside, deflection pulleys may have either the same grooves as the traction sheave in case of twisted application, or a convex shape (crowned) for alignment and a rim to protect against extreme sideward movements, in case the flat side is used as running surface.
Frame of the lift machine with a traction pulley and deflection pulleys
Example of a grooved and a flat deflection pulley with a bearing - material steel
Technical Parameters
| Main data of traction pulley | |
|---|---|
| Effective pulley diameter | > 100 mm (centre - centre of rope) |
| Groove shape | Semicircular radius 1,9 mm |
| Groove material | Steel, preferably 42CrMo4 |
| Groove surface | Hardened to 55-62 HRC or CrNi hard surface coating; Roughness Ra 1,6 - 3,2 μm |
| Main data of deflection pulley | |
|---|---|
| Pulley diameter | > 100 mm |
| Pulley shape | Convex radius 500 mm (running over flat side) or grooved identical to traction pulley (running over grooved side) |
| Pulley material | Steel or PA |
| Pulley surface | Roughness Ra max. 5 μm, preferably with low friction properties |
