Valves and valve actuation – Fluid actuated or retarded – Fluid link or column actuator
Patent
1979-06-11
1980-11-04
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Fluid link or column actuator
60560, 60576, 60594, 91401, 123 9012, 123 9015, F16K 31122, F16L 134, F16L 902
Patent
active
042315433
ABSTRACT:
A controllable hydraulic valve mechanism for reciprocating engines or pumps including a drive piston, operable by a cam is provided with control edges and projects into a drive cylinder; a working piston which operates the valve directly and is guided in a working cylinder. The valve mechanism provides a continuous communication between the drive cylinder interior and a second reservoir which absorbs a substantial part of the energy produced by the lift of a cam. Control sleeves surround the drive piston and are operable by actuating means operable from outside the drive cylinder. Each of the control sleeves has a control ring groove which cooperates with control edges provided in the drive piston. A further sleeve in the working cylinder surrounds the working piston, is rotatable by actuating means operable from outside the working cylinder, and is provided with a control ring groove for varying the valve lift. By means of this further sleeve, the working cylinder interior is connectable with a discharge conduit leading to the first reservoir. In this connection, the end face and the control ring groove are matched in such a way that a small amount of control fluid flows into the first reservoir during each valve lift adjustment. A cooler is provided in the refilling conduit.
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patent: 3872844 (1975-03-01), Gates
Fuhrmann Wolfgang
Zurner Hansjurgen
Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
Schwadron Martin P.
Walton G. L.
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