| 摘要 |
<p>The invention relates to an electro-hydraulic actuator comprising a body (1) which defines a cylindrical cavity (2) in which a piston (3) sealingly slides and divides the internal volume of the cavity into two variable-volume chambers (A, B), the piston being associated with at least one rod (4) which passes sealingly through an end wall of the cavity, the actuator comprising a two-way pump (5) having two ports (Pl, P2) each connected to one of the chambers, an electric motor (8) for selectively driving the pump in one direction or the other, the pump being positioned in the piston of the actuator so that it can move therewith. According to the invention, the motor is placed at the end of an actuator and drives a shaft (6) of non-circular cross section extending into the cavity parallel to a direction of sliding of the piston (3) and of the rod (4), the shaft passing through the piston (3) in order to collaborate with a homologous drive member (11; 21) of the pump sliding freely along the shaft as the rod moves but rotationally driven as the shaft rotates under the action of the electric motor.</p> |
