Linear oleodynamic actuator with take-up driven by a stepper motor intended to execute the command of the axial position of a variable-geometry camshaft particularly for a motor vehicle

摘要

The stepper motor 5, commanded by an electronic unit as a function of the working conditions of the motor, commands a first slide valve 10 which slides in a command piston 6 coaxial with the camshaft 1. By means of its relative axial position with respect to that of the piston 6 the slide valve 10 commands the communication between a pressure chamber 7 in which the said piston slides with a sealed joint and, either a source of pressurised oil or a discharge 18. <IMAGE>