Patent ID: 8104437

Claim:
An electromechanical device permitting the compression ratio of a variable compression ratio engine to be controlled, wherein comprising: at least one transmission device ( 1 ) permitting the transmission of the movement to each piston ( 2 ) by means of a transmission member ( 3 ) integral with said piston and cooperating, on the one hand, with a roller bearing guide device ( 4 ); a sprocket wheel ( 5 ) mounted on a connecting rod ( 6 ) integral with a crankshaft ( 9 ) and with a control rack ( 7 ) cooperating opposite the transmission member ( 3 ) with the sprocket wheel ( 5 ) and at least one control device ( 12 ), said control device ( 12 ) comprising, a control actuator ( 8 ) which includes an actuator piston ( 13 ) integral with an upper actuator rod ( 10 ) and with a lower actuator rod ( 16 ) cooperating with said control rack ( 7 ), and a control rod ( 20 ) passing through the actuator piston ( 13 ) in order to control the vertical position of said control rack ( 7 ) relative to the engine block of said engine; and mechanical means for transmitting the movement ( 801 ) which includes a shaft ( 803 ) comprising at least one cam ( 804 ), wherein said mechanical means for transmitting the movement ( 801 ) between at least one electric motor ( 802 ) and the at least one control rod ( 20 ) of the control actuator ( 8 ) of a control device ( 12 ) configured to control the vertical position of a control rack ( 7 ) of said variable compression ratio engine.