Abstract: An apparatus for deactivating an engine valve has an accumulator sleeve slidably retained in an engine block and biased toward a lower chamber in fluid communication with an interior of the sleeve. A follower piston slides in the sleeve in contact with a lobe of a can. An upper piston slides in an upper chamber in contact with a pushrod. A fluid passage connects the lower chamber and the upper chamber. A normally open spool valve in the fluid passage includes a control spool for opening and closing the passage. Another passage connects the lower chamber and one end of the control spool. A spring chamber provides fluid to an opposite end of the control spool through a control valve from a source of pressurized fluid.

Abstract: A control apparatus for deactivating one of an intake valve and an exhaust valve in an internal combustion engine has a stepped sleeve slidably receiving a valve stem in a smaller diameter portion and a rocker piston in a larger diameter portion. Hydraulic fluid is retained in the sleeve and a clamping block is positioned adjacent the exterior of the larger diameter portion. When the clamping block is activated to engage the sleeve, the sleeve remains stationary as reciprocating movement of the rocker piston causes the valve to open and close. When the clamping block is not activated, the sleeve is free to move with the piston leaving the engine valve closed.

Abstract: A valvegear for an engine of reciprocating piston type is disclosed. The valve gear includes a cam, a camshaft and a cam piston, where the cam is mounted to rotate on the camshaft and is in contact with the cam piston. The cam piston is movably arranged within a pressure chamber and is adapted to be moved by the cam away from the camshaft to pressurize a fluid within the pressure chamber. The valvegear further includes an engine valve which is movable between an open position and a closed portion, a restoring spring associated with each engine valve, a valve piston which is movable arranged in an actuating chamber, the engine valve is arranged to be moved into the open position against the force of the restoring spring by the valve piston, where the valve piston is arranged to move in the actuating chamber by the pressure produced in said pressure chamber by movement of said cam piston.

Abstract: An automotive valve rocker arm comprises a valve engagement portion and a cam engagement portion which are mounted for independent rocking movement about a rocker shaft. One of the cam engagement portion and valve engagement portion affords a first bush, which accommodates and is rotatable about the rocker shaft, and the other of which affords a second bush, which accommodates the first bush and is rotatable about the first bush and thus about the rocker shaft also. Selectively actuable locking means are accommodated within the space defined by the outer surface of the second bush and are movable between a first position in which relative movement of the valve engagement portion and the cam engagement portion is permitted and a second position in which they are locked together and such relative movement is prevented.