Hydraulically actuated exhaust valve for a reciprocating combust

Details Hydraulically actuated exhaust valve for a reciprocating combust Hydraulically actuated exhaust valve for a reciprocating combust

1982-09-17

1984-11-27

Koczo, Michael

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

251 63, F01L 100

Patent

active

044845456

ABSTRACT:
The exhaust valve has a valve member which opens away from the combustion chamber of the engine cylinder and which is biased for opening by the gas pressure prevailing in the combustion chamber. The valve is kept closed by an opposed hydraulic pressure which in a holding chamber acts on a holding piston secured to the spindle of the valve member. When the valve is to be opened, the pressure in the holding chamber is relieved and one or more valve controlled flow passages are opened, through which hydraulic liquid flows from the holding chamber to a reservoir defined by a further piston secured to the valve spindle. The two pistons are preferably of substantially equal size. When the exhaust valve is to be closed a hydraulic pressure is applied to a substantially smaller closing piston which is also secured to the valve spindle. During the closing movement hydraulic liquid flows from the reservoir back to the holding chamber and after the closing movement that chamber is again connected to the hydraulic pressure which ensures that the valve member is maintained in its closed position against the gas pressure.

REFERENCES:
patent: 3209737 (1965-10-01), Omotehara
patent: 3943825 (1976-03-01), Bianchetta
patent: 4088151 (1978-05-01), Schorger

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