ACTUATING UNIT FOR AXIAL DEFLECTION OF GAS-EXCHANGING VALVE IN COMBUSTION ENGINE Russian patent published in 2017 - IPC F01L9/02 F01L1/02 

FIELD: engines and pumps.

SUBSTANCE: actuating unit comprises a disk and a rod that form a piston. A rod is attached to the disk and axially exposes from it. A disk divides a cylinder volume into the first and the second parts and is capable of anaxial movement between active and inactive positions, and a rod is capable of an axial movementin concordance with the disk movement. The unit also comprises a pressurized fluid circuit that is designed with a possibility of controlled fluid communication and with the cylinder volume first part. The unit has the first hydraulic circuit (21) that comprises a fluid-filled space (22). A piston of an actuating unit comprises the second hydraulic circuit (24). A space (22) is in communication with a central hole through the fluid (25) in the second circuit (24) when the piston disk is in the inactive position. A hole (25) is semi-bounded by a positioning piston (29) that is capable of an out-in traverse axially towards the piston and of a pressing on a gas-exchanging valve in the cylinder volume second part. A second circuit (24) comprises a valve (27) that is configured to prevent the fluid flow from the hole (25). A rod has an exposed end (30) that is partially thrust against a stop surface (31) in the space (22) when the disk is in the inactive position. A piston area (29), that faces the central hole (25), is less than or equal to the pressurized exposed end (30) area of the actuating unit piston rod.

EFFECT: actuating unit piston rod is always in the inactive defined position when the engine valve is closed or the actuating unit is inactive.

5 cl, 5 dwg