An electric oil pump includes a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly and an electric control board, the pump housing defining a pump cavity including first cavity and second cavities, the pump rotor assembly arranged in the first cavity, and the stator assembly, the motor rotor assembly and the electric control board arranged in the second cavity. The pump housing includes a first housing having a side wall with inner and outer surfaces, at least a part of the inner surface is in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, at least a part of the first heat dissipating portion covers at least a part of an outer circumference of the stator assembly in a circumferential direction of the electric oil pump.

A dual input fluid pump system for coupling to a transmission or an engine and an electrical motor is disclosed. The system may include a first external gear, vane, internal gear, or gerotor-type pump, a second external gear pump, and connecting shaft. Gears of the second pump include one-way clutch bearings that enable operation of the system in multiple modes including engine-only; motor-only; a combined mode where the engine operates the first pump via the shaft and the motor operates the second pump with an external gear rotating in its pumping direction at a rate greater than the shaft; inlet boost; and a disconnection mode. Also noted is a pump that has a first shaft for coupling the engine to a first external gear and a second shaft for coupling the motor to a second external gear, as well as a one-way clutch bearing that performs in a similar manner.

A gear pump or motor includes a main pump or motor connected to a drive source, and an auxiliary pump or motor. The main pump or motor includes helical main drive and driven gears, and a main drive shaft. A main connection part is formed at a leading end surface of the main drive shaft. The auxiliary pump or motor includes an auxiliary drive shaft extending toward the main drive shaft, an auxiliary connection part formed at a leading end face of the auxiliary drive shaft. A connecting member connects the main and auxiliary connection parts, and is in contact with an outer edge portion of the leading end face of the main drive shaft. A space opposes a receiving surface of the connecting member. The receiving surface opposes the auxiliary pump or motor. High-pressure operating fluid is supplied to the space.

A gear pump or motor includes a main pump or motor connected to a drive source, and an auxiliary pump or motor. The main pump or motor includes helical main drive and driven gears, and a main drive shaft. A main connection part is formed at a leading end surface of the main drive shaft. The auxiliary pump or motor includes an auxiliary drive shaft extending toward the main drive shaft, an auxiliary connection part formed at a leading end face of the auxiliary drive shaft. A connecting member connects the main and auxiliary connection parts, and is in contact with an outer edge portion of the leading end face of the main drive shaft. A space opposes a receiving surface of the connecting member. The receiving surface opposes the auxiliary pump or motor. High-pressure operating fluid is supplied to the space.

A pump assembly and a method for cooling the same are disclosed. The pump assembly includes a pump, a controller, and a driven electric motor. The pump and the electric motor are on opposing axial sides of the controller. The assembly also has a heat conductive plate positioned between the pump and the controller that conducts heat from the controller. A transfer passage is provided for receiving pressurized fluid output from the pump and to direct the fluid along and in contact with the heat conductive plate to conduct heat therefrom into the pressurized fluid. An outlet passage communicates with the assembly outlet to discharge the pressurized fluid.

Single expander device working with two working media in a two-stage organic Rankine cycle, which has a cylinder body, a rotor disposed inside the cylinder body and provided with a number of slip sheets in a radial direction of the cylinder body, and a rotary shaft fixedly connected to the center of the rotor, with the outer profile of the cylinder body defined by two mathematical equations.

An external gear pump includes a pump housing in which a pump chamber is formed, a primary gear having a plurality of external teeth housed in the pump chamber, a secondary gear having a plurality of external teeth that mesh with the plurality of external teeth of the primary gear in the pump chamber, a first electric motor configured to generate a torque for rotationally driving the primary gear, a second electric motor configured to generate a torque for rotationally driving the secondary gear, and a control unit configured to control the first and second electric motors. The control unit controls the first and second electric motors so that the torque generated by the first electric motor is greater than the torque generated by the second electric motor.

An external gear pump includes a pump housing in which a pump chamber is formed, a primary gear having a plurality of external teeth housed in the pump chamber, a secondary gear having a plurality of external teeth that mesh with the plurality of external teeth of the primary gear in the pump chamber, a first electric motor configured to generate a torque for rotationally driving the primary gear, a second electric motor configured to generate a torque for rotationally driving the secondary gear, and a control unit configured to control the first and second electric motors. The control unit controls the first and second electric motors so that the torque generated by the first electric motor is greater than the torque generated by the second electric motor.

A fluid delivery device having a forepump and a main pump fluidically connected to the forepump, wherein the forepump can be driven via a forepump input shaft and the main pump can be driven via a main pump input shaft. According to the invention, the forepump has a forepump drive gear coupled to the forepump input shaft and a forepump delivery gear interacting with the forepump drive gear to deliver the fluid, wherein the forepump and the main pump are drivingly coupled to a common drive shaft, and wherein the forepump delivery gear and the main pump input shaft are connected to one another via a connecting shaft such that the forepump input shaft is coupled directly to the drive shaft and the main pump input shaft is coupled to the drive shaft via the connecting shaft.

Provided is an electric pump device which includes a motor having a shaft extending along a first central axis, a pump portion driven by the motor, and a housing for housing the motor and the pump portion. The housing includes: a housing body portion which has a bottomed tube shape and extends in an axial direction, a flange portion which expands radially outward from an outer peripheral surface of the housing body portion, a seal portion which has a ring shape extending in a circumferential direction and is arranged at a corner portion in which the outer peripheral surface of the housing body portion and an end surface facing one axial side of the flange portion are connected, and a projection portion extending from a bottom portion of the housing body portion toward one axial side. A second central axis of the projection portion is arranged at a position shifted in a radial direction from the first central axis. The flange portion has positioning portions on the end surface facing the one axial side of the flange portion. The positioning portions have a convex shape projected from the end surface facing the one axial side of the flange portion toward the one axial side or a hole shape recessed from the end surface toward the other axial side.