Electro-hydraulic actuator with pump incorporated into the...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 15/18 (2006.01)

Patent

CA 2728152

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.

L' invention concerne un actionneur électrohydraulique comportant un corps (1) qui définit une cavité cylindrique (2) dans laquelle un piston (3) coulisse à étanchéité et divise un volume interne de la cavité en deux chambres (A, B) à volume variable, le piston étant associé à au moins une tige (4) qui traverse à étanchéité un fond de la cavité, l' actionneur comportant une pompe bi-directionnelle (5) ayant deux ports (P1, P2) connectés chacun à l'une des chambres, un moteur électrique (8) pour entraîner sélectivement la pompe dans un sens ou dans l'autre, la pompe étant placée dans le piston de l' actionneur pour être mobile avec celui-ci. Selon l'invention, le moteur est placé en extrémité d'actionneur et entraîne un arbre de section non circulaire (6) s' étendant dans la cavité parallèlement à une direction de coulissement du piston (3) et de la tige (4), l'arbre traversant le piston (3) pour coopérer avec un organe d'entraînement (11; 21) homologue de la pompe glissant librement le long de l'arbre lors des déplacements de la tige mais entraîné en rotation lorsque l'arbre tourne sous l'action du moteur électrique.

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