Ball-screw lift device for variable compression-ratio engine

F - Mech Eng,Light,Heat,Weapons – 02 – B

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Details

F02B 75/04 (2006.01) F01B 9/04 (2006.01) F02B 75/32 (2006.01) F02D 15/02 (2006.01) F16K 11/056 (2006.01) F16K 11/10 (2006.01) F16K 15/18 (2006.01) F16K 31/124 (2006.01)

Patent

CA 2727333

The ball-screw lift device for a variable compression-ratio engine comprising a double-acting hydraulic control actuator (8) comprising an upper chamber (121) and a lower chamber (122) and at least one actuator piston (13) connected to a control rack (7), comprises: at least two balls (401, 402) or shutters each resting on a seat (403, 404) and respectively closing off each end of a transfer port (405) connecting the upper chamber (121) of the control actuator (8) to the lower chamber (122), said balls (401, 402) acting like a non-return valve when held on their seat (403, 404) by a spring (408, 409) in order to allow the hydraulic fluid to pass in just one direction; and lift means (410) comprising at least one electric motor (480) designed to turn at least one screw (481, 482) allowing at least one ball (401, 402) to be lifted off or set down on its seat (403, 404).

Le dispositif de levée de bille à vis pour moteur à taux de compression variable comprenant un vérin de commande hydraulique à double effet (8) comportant une chambre supérieure (121) et une chambre inférieure (122) et au moins un piston de vérin (13) relié à une crémaillère de commande (7) comprend : Au moins deux billes (401, 402) ou clapets reposant chacun(e) sur un siège (403, 404) et obturant respectivement l'une et l'autre extrémité d'un canal de transfert (405) reliant la chambre supérieure (121) et la chambre inférieure (122) du vérin de commande (8), lesdites billes (401, 402) agissant comme un clapet anti-retour lorsqu'elles sont maintenues sur leur siège (403, 404) par un ressort (408, 409) afin de ne laisser passer le fluide hydraulique que dans un sens; Et des moyens de levage (410) comprenant au moins un moteur électrique (480) prévu pour entraîner en rotation au moins une vis (481, 482) permettant de lever ou de déposer de son siège (403, 404) au moins une bille (401, 402).

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