Actuator for accomplishing the swinging motion of a swinging...

B - Operations – Transporting – 62 – D

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Details

B62D 57/02 (2006.01) F15B 11/20 (2006.01) F15B 13/06 (2006.01)

Patent

CA 2266558

An actuator particularly for accomplishing the swinging motion of a swinging arm comprises two cylinders (S, S') using a pressurized medium, the piston rods (8, 8') of the cylinders being connected to a structure rotatable in relation to the swinging arm for the purpose of rotating the swinging arm around a rotation axis (A) by the effect of movements of the pistons (7, 7') of the cylinders. The actuator comprises two control valves, of which one control valve (2) is arranged to guide the pressurized medium either to both cylinders (S, S') while they are coupled in parallel, or solely to one cylinder (S, S') where its piston rod chamber (10, 10') and piston chamber (9, 9') are coupled together. This results in a movement of the piston outwards, because the pressure is directed to the whole work area of the piston (7, 7') on the side of the piston chamber (9, 9') and on the side of the piston rod chamber only to the work area which is the difference between the cross-sectional areas of the piston (7, 7') and the piston rod (8, 8'). Further, the pressurized medium needs to be supplied only in an amount proportional to said difference for achieving the same speeds of motion as before.

La présente invention concerne un actionneur permettant, en particulier, le mouvement d'oscillation d'un bras oscillant et comportant deux vérins (S, S) utilisant un fluide sous pression, les tiges de piston (8, 8') des vérins étant reliées à une structure pivotante par rapport au bras oscillant, de façon à faire pivoter le bras oscillant autour d'un axe de rotation (A) sous l'effet des mouvements des pistons (7, 7') des vérins. L'actionneur comporte deux soupapes de commande, l'une (2) d'entres elles étant conçue pour amener le fluide sous pression soit sur les deux vérins (S, S') lorsqu'ils sont couplés en parallèle soit sur un seul vérin (S, S') lorsque la chambre (10, 10') de la tige de piston et une chambre (9, 9') de piston sont couplées. Le piston est alors repoussé vers l'extérieur, la pression étant renvoyée, côté chambre (9, 9') de piston, sur la totalité de la surface efficace du piston (7, 7') et côté chambre tige du piston uniquement sur la surface efficace représentant la différence entre les surfaces de section du piston (7, 7') et la tige (8, 8') du piston. En outre, pour obtenir les mêmes vitesses de mouvement que précédemment, l'apport de fluide sous pression ne doit se faire qu'en quantité proportionnelle à la différence considérée.

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