The automatic device for the belt, in particular for synchronous transmission belt, as a belt of the distribution of the thermal engine.

摘要

Tensioner in a synchronous belt transmission, in particular for a toothed belt of the distribution of heat engine of the type "linear axial thrust", comprising a roller (21) which is adapted to cooperate with the belt (11) and an actuator (25) of the roller to piston (31) mounted to slide in a body (30) which defines a pressure chamber (32) and a reserve chamber (33) of a hydraulic fluid, said chambers being able to communicate with each other by at least one channel of the piston on which is exerted the action of a compression spring (36) urging the piston in the direction of the reserve chamber. & br / the piston (31) is pierced with a multiplicity of channels which may be open / closed by a valve (40) formed by a valve to the operating part constituted by a flexible lip.