Accession Number : ADD015782

Title :   Hydraulic Pump With Integral Electric Motor.

Descriptive Note : Patent, filed 23 Mar 92, patented 2 Mar 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Schneider, William E

Report Date : 02 Mar 1993

Pagination or Media Count : 8

Abstract : A pumping mechanism featuring integration of a fixed displacement radial piston pump within an electric drive motor and cooperative operation of a radially inwardly facing piston-actuating cam with a pair of opposing axially inwardly facing spool-valve actuating cams. The piston-actuating cam is effectively the inner surface of the rotating motor rotor, the pistons extending radially from a fixed central body. Consequent benefits of the integrated configuration are greater quietness, compactness, efficiency and corrosion resistance. The external motor unit provides protection, there is a damping effect, and there are fewer parts which are subject to damage or malfunction. Further reductions in noise and leakage are gained by synchronized operation, in terms of fluid pumping, of the spool-valve actuating cams and the piston-actuating cam. The piston elements can be distributed so as to foster balanced loadings, and the pump flow rate can be controlled by varying the motor's rotational speed, thus advantageously combining the hydraulic pressure balance which is characteristic of a fixed-displacement pump with the variable delivery of a variable-displacement pump.

Descriptors :   *PISTONS, *PUMPS, *PATENTS, *ELECTRIC MOTORS, CAMS, CONFIGURATIONS, CORROSION RESISTANCE, DAMAGE, DAMPING, DISPLACEMENT, DRIVES, EFFICIENCY, FACINGS, FLOW RATE, HYDRAULIC PRESSURE, HYDRAULICS, INTEGRATION, MALFUNCTIONS, MOTORS, NOISE, PUMPING, RESISTANCE, ROTORS, SURFACES, VALVES, VELOCITY, ELECTRIC MOTOR NOISE, ELECTRIC MOTOR STATORS, FLUID FLOW

Subject Categories : Electrical and Electronic Equipment
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE