Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Reexamination Certificate
2005-06-21
2005-06-21
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
C123S090130, C123S090150, C123S090160, C123S19800E
Reexamination Certificate
active
06907851
ABSTRACT:
An engine valve actuation system is provided. The engine valve actuation system includes an intake valve that is moveable between a first position to prevent a flow of fluid and a second position to allow a flow of fluid. A cam assembly is configured to move the intake valve between the first position and the second position. A fluid actuator is configured to selectively prevent the intake valve from moving to the first position. A source of fluid is in fluid communication with the fluid actuator. A directional control valve is configured to control a flow of fluid between the source of fluid and the fluid actuator. A check valve is disposed between the directional control valve and the source of fluid, only allowing fluid flow from the fluid source to the directional control valve. A bleed orifice may be disposed between the directional control valve and the source of fluid, in parallel with the check valve.
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Barnes Travis E.
Bruce Judson R.
Cornell Sean O.
Handly Douglas E.
Leman Scott A.
Burrows J. W.
Caterpillar Inc
Denion Thomas
Lundquist Steve D
Riddle Kyle M.
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