Internal-combustion engines – Poppet valve operating mechanism – Pneumatic system
Patent
1989-01-06
1990-07-24
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
Pneumatic system
123 9012, 123 9024, 91459, 91465, 92 85B, 251 635, 13762564, F15B 1108, F15B 1304, F01B 1102
Patent
active
049428527
ABSTRACT:
A bistable electronically controlled pneumatically powered transducer for use, for example, as a valve mechanism actuator in an internal combustion engine is disclosed. The transducer has a piston which is coupled to an engine valve, for example. The piston is powered by a pneumatic source and is held in each of its extreme positions, and air control valves are held in their closed positions by pressurized air and/or permanent magnet latching arrangements and the control valves are released therefrom to supply air to the piston, and the piston is released therefrom to be pneumatically driven to the other extreme position by an electromagnetic neutralization of the permanent magnet field. The piston forms a part of the magnetic latching circuit and that magnetic circuit also includes a radially slotted ferromagnetic member to both complete the magnetic circuit and provide a good air communication path from a high pressure air inlet to the control valve. A pair of auxiliary pistons movable with the piston compress air to a pressure above the pressure of the pneumatic source for aiding reclosure of the control valves as well as aiding maintenance of those control valves in their closed positions thereby reducing the size and cost of the latching permanent magnets.
REFERENCES:
patent: 4582082 (1986-04-01), Tosseghini
patent: 4741364 (1988-05-01), Stoss et al.
patent: 4742989 (1988-05-01), Akagi
patent: 4777915 (1988-10-01), Bonvallet
patent: 4809587 (1989-03-01), Kawahara et al.
ERickson Frederick L.
Richeson William E.
Briody Thomas A.
Lo Weilun
Magnavox Government and Industrial Electronics Company
Myhre Charles J.
Rickert Roger M.
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