Tensioning device for chain drive of internal-combustion engine, has thread pitches of inner thread overleaped by flexible deformation of piston during driving out of piston, which is made of thermoplastic or duroplastic material

摘要

The device (1) has a piston (6) that is driven out along an axis of a guidance housing (2) under influence of force in the housing. A resting device prevents driving movement of the piston in the housing, where the resting device includes an inner thread (3) provided at the housing. The piston includes an external thread (8) that acts together with the inner thread. A wall thickness of the piston is selected such that thread pitches of the inner thread are overleaped by flexible deformation of the piston during driving out of the piston, which is made of thermoplastic or duroplastic material.