Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1996-12-19
1997-11-04
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
F01L 902
Patent
active
056828462
ABSTRACT:
A high pressure fluid is used to power an actuator for opening and closing an engine poppet valve when the actuator has a valve stem supporting an upper piston and an adjacent lower piston which axially transverse an actuator housing in response to the flow of high pressure fluid as determined by the position of a control valve. The upper piston has a larger diameter than the lower piston which has a larger diameter than the valve stem. An upper chamber is defined by the upper piston and the actuator housing while a lower chamber is defined by an outside peripheral surface of the lower piston and the actuator housing.
REFERENCES:
patent: 3209737 (1965-10-01), Omotehara et al.
patent: 5193495 (1993-03-01), Wood, III
patent: 5529030 (1996-06-01), Rose
patent: 5582141 (1996-12-01), Meyer
patent: 5595148 (1997-01-01), Letsche et al.
Eaton Corporation
Lo Weilun
Uthoff Jr. Loren H.
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