Patent ID: 6568360
Filing Date: 2003-05-27
Classification: F01L

Abstract:
An electrohydraulic device (1) for operating an intake or exhaust valve (2) of a combustion engine; the electrohydraulic device (1) comprises a linear hydraulic actuator (10) designed to move the valve (2) axially from a closed position to a maximum opening position, and an electronic control hydraulic distributor (11) designed to regulate the flow of pressurized liquid from and towards the linear hydraulic actuator (10) in order to control movement of the above-mentioned valve (2) between said closed and maximum opening positions; the electrohydraulic device (1) is characterized in that said electronic control hydraulic distributor (11) comprises a slide valve (12) which, by selection, can be set to three positions: a first operating position in which it establishes direct communication between said linear hydraulic actuator (10) and an outlet (15b) of the pressurized liquid, a second operating position in which it isolates said linear hydraulic actuator (10) in such a way as to prevent the flow of pressurized liquid from or towards the actuator, and a third operating position which establishes direct communication between said linear hydraulic actuator (10) and an inlet (15a) of the pressurized liquid.