Tensioning device for traction drive for generators etc has piston guided and sealed by disc-like reinforced sealing element fixed on housing wall

摘要

The tensioning device has a hydraulically mechanically operating actuating element (2) with piston (4) longitudinally displaceable in a cylinder. The piston is guided and sealed by a disc-like reinforced sealing element (13) fixed on the housing wall (14). The sealing element has a first sealing bead (15) on the outer circumference and a second sealing bead (16) on the inner diameter. When installed the beads point in the direction of the one-way valve (10) and are supported with radial pretension on the piston or housing wall.