High speed engine valve actuator

Details High speed engine valve actuator High speed engine valve actuator

1975-10-06

1977-01-04

Myhre, Charles J.

Fluid handling

Systems

Supply and exhaust

123 9011, 123 9012, 251 30, F16K 3112

Patent

active

040007561

ABSTRACT:
An electro-hydraulic system capable of high speed and precision timing, is disclosed, particularly adapted to the opening and closing of the intake and exhaust valves of an internal combustion engine under computer control. The actuator is powered by pressurized crankcase oil which is discharged on the engine valve stems for lubrication. The system employs hydraulic cushioning to reduce engine valve seating velocity, and recovers energy on the return stroke of the valve to improve efficiency. High speed is achieved by rapid de-energization of electromagnets which hold the fluid control valves closed against the force of the pressure of the hydraulic supply. These electromagnets latch the valves in their most power-efficient mode, that is, with the magnetic circuit gap at or near zero.

REFERENCES:
patent: 685741 (1901-11-01), Clarke
patent: 2785638 (1957-03-01), Moller
patent: 3294120 (1966-12-01), Ruchser
patent: 3399689 (1968-09-01), Keane
patent: 3520511 (1970-07-01), Warne
patent: 3904167 (1975-09-01), Touch
patent: 3926159 (1975-12-01), Michelson

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