Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1990-07-24
1991-06-11
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9011, 123 9014, 91459, 91 42, 13762565, 137906, 251 635, F15B 13044, F01L 902
Patent
active
050223585
ABSTRACT:
An electronically controllable hydraulically powered asymmetrical valve actuating mechanism for use in an internal combustion engine of the type having engine intake and exhaust valves with elongated valve stems is disclosed. The actuator is a bistable electronically controlled hydraulically powered transducer having an armature including a power piston which is reciprocable between first and second positions along with a hydraulic arrangement for powering the armature from a first (engine valve closed) position to a second position. A bistable control valve is operable in one of its stable states to supply high pressure hydraulic fluid to one face of the piston to power the armature and in the other of its stable states to relieve the high pressure fluid from the piston. The mechanism has a compressible resilient arrangement such as a coil spring or a chamber in which air is compressed during motion of the armature from the first position to the second position. This compression of the air not only slows armature motion as it nears the second position, but also provides a potential energy store for powering the armature back to its initial position. The control valve remains in said one stable state to temporarily prevent reversal of armature motion when the motion of the armature has slowed to a stop, the control valve returning to the other of its stable states on command to allow the spring or air compressed in the chamber to return the armature to the first position.
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patent: 4791895 (1988-12-01), Tittizer
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patent: 4974495 (1990-12-01), Richeson, Jr.
Kraus Robert J.
Moulis Tom
North American Philips Corporation
Wolfe Willis R.
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