Pumps – Correlated pump and motor or clutch control – Pump distributor control
Patent
1988-03-02
1989-05-16
Smith, Leonard E.
Pumps
Correlated pump and motor or clutch control
Pump distributor control
91350352, 417393, F04B 908
Patent
active
048305839
ABSTRACT:
A fluid pump is shown which includes integral valve and cylinder housings. The cylinder housing is formed with axially aligned cylinders. Axially movable pistons are located in the cylinders, which pistons are interconnected by a piston rod extending through a common inner end wall of the cylinders. Axially movable push rods extend through opposite outer end walls of the cylinders. The valve housing contains a plurality of three-way valves for communication with opposite ends of the cylinders, which valves are interconnected for simultaneous movement thereof. Mechanical linkage connects the push rods to the valves for actuation of the valves from a first to a second condition when the pistons are moved to one end of the cylinders, and for actuation from the second to the first condition when the pistons are moved to the other end of the cylinders. Resilient rocker arms are included in the mechanical linkage for storing and returning kinetic energy of the movable pistons at opposite ends of piston travel. End covers at opposite ends of the valve and cylinder housings prevent external leakage of fluid which may leak from opposite ends of the valve housing or from the cylinders past the push rods.
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Beckman Victor R.
Smith Leonard E.
SRI - International
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