Hydraulically propelled phneumatically returned valve actuator

Details Hydraulically propelled phneumatically returned valve actuator Hydraulically propelled phneumatically returned valve actuator

1990-07-24

1991-10-22

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

92134, 91454, 91459, 123 9065, F01L 902

Patent

active

050585380

ABSTRACT:
An actuator which is used, for example, to operate an internal combustion engine poppet valve is configured to open the poppet valve by means of a high pressure hydraulic fluid. This fluid powers the actuator piston and, at the same time, compresses air to accomplish both damping of the piston and conversion of the kinetic energy of piston translation into potential (pneumatic) energy. The actuator is held or captured in the second or valve-open position by a hydraulic latch and when released, is returned by the stored pneumatic energy to its initial position. Damping of the returning actuator piston is accomplished by a separate adjustable pneumatic orifice arrangement to assure gentle seating of the poppet valve.

REFERENCES:
patent: 3537355 (1970-11-01), Bliss
patent: 4555974 (1985-12-01), Mason et al.
patent: 4563941 (1986-01-01), Soendergaard
patent: 4669358 (1987-06-01), Aspervall et al.
patent: 4759260 (1988-07-01), Lew
patent: 4777800 (1988-10-01), Hay, II
patent: 4809587 (1989-03-01), Kawahara et al.
patent: 4836757 (1989-06-01), Curwen et al.
patent: 4889035 (1989-12-01), Goodnow
patent: 4922805 (1990-05-01), Beswick

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