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AssigneeNorth American Philips Corporation
InventorsFrederick L. Erickson, William E. Richeson
Estimating the term…
A high efficient actuator used to operate an engine's poppet valves is disclosed. Pneumatic pressure is applied to an actuator piston which is locked in either a first or a second position by an interconnected fluid latch. Upon a timed command, the piston latch is released allowing the pre-pressurized piston to rapidly transit from whichever of its two positions it happens to be in to the other. The actuator is configured to compress the air on the advancing side of the piston as the energy of the expanding air is propelling the piston to its other position. The fluid latch is configured to prevent the main piston from reversing direction at the end of its travel, thus trapping all the compressed air to be used to help propel the actuator piston back to its original position. The actuator has a feature for supplying make up air on the opening portion of the cycle in order to compensate for blow down as well as other losses. The actuator also has a feature for increasing the pressure in the latching chamber during the return stroke to assure positive seating of the interconnected poppet valve.
A bistable pneumatically powered hydraulically latched actuator mechanism comprising:
An electronically controllable pneumatically powered valve actuating mechanism for use in an internal combustion engine of the type having engine intake and exhaust valves with elongated valve stems, the actuator comprising;
In an electronically controlled actuator for an internal combustion engine poppet valve, an arrangement for securing gentle yet positive engine valve closure comprising:
In a bistable reciprocating armature actuator, the method of securing the armature in one of its stable positions comprising:
A bistable actuator having a mechanism portion reciprocable between each of two-stable positions and comprising:
An electronically controllable valve actuating mechanism for use in an internal combustion engine of the type having engine intake and exhaust valves with elongated valve stems, the actuator having a pair of stable positions and comprising;
A bistable electronically controlled pneumatically driven hydraulically latched transducer having an armature reciprocable between first and second positions, hydraulic means for holding the armature in each of the first and second positions said hydraulic means including a bistable control valve operable in one of its stable states to supply high pressure hydraulic fluid to force the armature in one direction and in the other of its stable states to supply high pressure hydraulic fluid to force the armature in an opposite direction, a first chamber in which air is compressed during motion of the armature from the first position to the second position, compression of the air slowing armature motion as it nears the second position, a second chamber in which air compressed during motion of the armature from the second position to the first position, compression of the air slowing armature motion as it nears the first position, the control valve remaining 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 air compressed in the chamber to return the armature to the first position.
A bistable electronically controlled transducer having an armature reciprocable between first and second positions, first pneumatic means for powering the armature from the first position to the second position, second pneumatic means for powering the armature from the second position back to the first position, a first pneumatic spring which is compressed during motion of the armature from the first position to the second position, compression of the first pneumatic spring slowing armature motion as it nears the second position, hydraulic means maintaining pressure on the armature to temporarily prevent reversal of armature motion when the motion of the armature has slowed to a stop, the hydraulic means being disableable on command to allow the compressed first pneumatic spring to return the armature to the first position.
A bistable electronically controlled transducer having an armature reciprocable between first and second positions, first means for powering the armature from the first position to the second position, second means for powering the armature from the second position back to the first position, at leas tone pneumatic spring which is compressed during motion of the armature from the first position to the second position with compression of the pneumatic spring slowing armature motion as it nears the second position, means for maintaining pressure on the armature to temporarily prevent reversal of armature motion when the motion of the armature has slowed to a stop and operable on command to allow the compressed pneumatic spring to return the armature to the first position, and means for establishing an initial air pressure for the pneumatic spring preparatory to compression during armature motion.
Dependencies are inferred from the claim text.