Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2005-09-13
2005-09-13
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090150, C123S090120, C123S19800E
Reexamination Certificate
active
06941909
ABSTRACT:
An engine valve actuator is provided. The actuator includes an actuator housing that defines a tank adapted to store a supply of fluid and a bore in fluid communication with the tank. A piston is slidably disposed in the bore of the actuator housing. The piston is adapted to move between a first position and a second position where the piston selectively engages an engine valve. A mechanical biasing element acts on the piston to move the piston towards the second position. A control valve is disposed between the tank and the bore in the actuator housing. The control valve is moveable between a first position where fluid is allowed to flow between the tank and the bore and a second position where fluid is prevented from flowing between the bore and the tank to trap fluid in the bore. The trapped fluid prevents the piston from moving with respect to the actuator housing to thereby prevent the engine valve from moving to a closed position.
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Cornell Sean O.
Robel Wade James
Caterpillar Inc
Denion Thomas
Finnegan Henderson Farabow Garrett & Dunner
Riddle Kyle M.
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