Belt tensioning device for the drive of secondary assemblies of engines - has friction body formed by two wedged piston parts set axially in succession

摘要

The flat wedge faces (15) form an acute angle with the cylinder axis. One piston part (12) is fixed on the piston rod (3) and the second compression spring (14) designed as a coil spring is supported by one end on the other piston part (13) and by its other end on a base wall (2) of the cylinder. The friction body can be formed by a piston (21) with a central conical recess emerging from one end side. The piston is axially supported inside the recess on a funnel part (22) connected to the piston rod (9). The piston can have a further conical recess which starts from an end side remote from the funnel part and contains a conical support body (32) axially supporting the piston. ADVANTAGE - Compact design with few easily manufacture parts.