F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/46
F04B 47/08 (2006.01) F04B 1/053 (2006.01) F04B 49/08 (2006.01) F04B 49/24 (2006.01)
Patent
CA 1188152
VARIABLE VOLUME HYDRAULIC PUMP ABSTRACT OF THE DISCLOSURE A variable volume pump for satisfying the requirements of a hydraulic system while absorbing excess fluid volume when the full volume of fluid displacement from the pump is not required by the hydraulic system. The pump includes one or more lines of reciprocable pistons mounted radially around a crankshaft. The rotation of the crankshaft results in centrifugal flow of fluid through crankpin apertures for filling the pistons. Each piston includes a cylindrical tube portion which is slidably movable within a metering sleeve. The metering sleeve is spring biased towards a position for covering metering ports that are located around the periphery of the piston tube portion. When the fluid pressure in the hydraulic system acting on a metering sleeve abutment area exceeds the force of the metering sleeve spring, the metering sleeve moves thereby uncovering the piston metering ports. The movement of the metering sleeve permits the piston to travel an equal distance with its metering ports open. This results in the displacement of a fluid volume to a low pressure cavity within the pump until the piston metering ports are again closed by the metering sleeve. Thus, fluid flow from the pump is reduced in proportion to increased system pressure until a maximum desired output pressure is reached with minimum fluid flow.
411592
Brumbaugh Eldon M.
Falendysz Eugene L. SR.
Case (j.i.) Company
Gowling Lafleur Henderson Llp
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