Patent ID: 6681734
Filing Date: 2004-01-27
Classification: F01L

Abstract:
Cylinder deactivation apparatus for an engine having multiple cylinders, said apparatus comprising:a plurality of valve actuators for actuating respective valves of the multiple cylinders, some of said actuators being switchable between valve actuating and valve deactivating conditions wherein the respective valves are operated normally in the valve actuating conditions and are deactivated to remain closed in the deactivating conditions; a gallery having bores for receiving said valve actuators and including supply and exhaust passages for supplying and discharging pressurized hydraulic fluid to and from the switchable actuators for switching their conditions; and rotary valve sleeves between each of the switchable valve actuators and their respective bores, the sleeves being rotatable between on and off positions operative respectively to discharge fluid from the switchable actuators for normally actuating the associated valves and to maintain pressurized fluid in the switchable actuators for deactivating the associated valves.