Dual Drive Gerotor Pump

A fluid pumping system for a vehicle having an internal combustion engine, the fluid pumping system comprising:

• a housing;
• an electric motor;
• a rotatable first input driven by the internal combustion engine;
• a rotatable second input driven by the electric motor;
• a gerotor including an inner rotor circumscribed by an outer rotor, wherein the outer rotor includes a number of teeth greater than a number of teeth of the inner rotor:
• and
• a cam ring having a cylindrical cavity, the inner rotor and the outer rotor being positioned within the cylindrical cavity, wherein the cam ring is drivingly coupled to one of the electric motor and the internal combustion engine, the inner rotor being drivingly coupled to the other of the electric motor and the internal combustion engine, wherein the cam ring is supported for rotation within the housing, the outer rotor rotating relative to the inner rotor when each of the following conditions A, B and C occur, wherein
• condition A includes the first input being rotated while the second input does not rotate;
• condition B includes the first input not rotating while the second input rotates;
• and
• condition C includes both the first input and second input simultaneously rotating.

A fluid pumping system for a vehicle having an internal combustion engine, the fluid pumping system comprising:

• a housing including a first end plate, a second end plate and an intermediate plate positioned therebetween;
• an electric motor;
• a rotatable input shaft adapted to be driven by the internal combustion engine;
• a rotatable motor shaft driven by the electric motor;
• a gerotor including an inner rotor circumscribed by an outer rotor;
• and
• a drum rotatably mounted within the housing, the drum including an outer ring, a cam ring, a first end cap and an opposite second end cap fixed together for rotation with one another, the outer ring having a predetermined width and circumscribing the first end cap and the second end cap, the intermediate plate having a thickness defining a gap between the first end plate and the second end plate to receive the outer ring therebetween for rotation relative to the housing, the outer ring at least partially defining and being positioned between a high pressure cavity that circumscribes the outer ring and pumping chambers between the inner rotor and the outer rotor, wherein the cam ring is circumscribed by the outer ring and includes a cavity in receipt of the inner rotor and the outer rotor.