# US 2019/0376512 A1 · Pump apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376512 A1 - Document ID: US20190376512A1 - Status: Published application - Kind: A1 - Application number: 16/486,178 - Filed: 2018-02-23 - Published: 2019-12-12 - Earliest claimed: 2017-03-03 - Assignees: Nidec Tosok Corporation - Applicants: Nidec Tosok Corporation - Inventors: Yoshiyuki KOBAYASHI; Kazuhiro HOMMA; Koji HIGUCHI; Yosuke ITO - Web page: https://patentgrep.com/patent/US20190376512A1 ## CPC - F04C 15/0096: {Heating; Cooling (of machines or engines in general F01P)} - B62D 5/07: Supply of pressurised fluid for steering also supplying other consumers {; control thereof} - F04C 2/10: of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member - F04C 11/008: {Enclosed motor pump units} - F04C 15/008: {Prime movers} - F04C 29/047: {Cooling of electronic devices installed inside the pump housing, e.g. inverters} - H02K 5/203: {specially adapted for liquids, e.g. cooling jackets} - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - F04C 2210/206: Oil - F04C 2240/403: with inverter for speed control - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A pump apparatus includes a motor including a shaft disposed along a central axis extending in an axial direction a pump that is located on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges an oil and an inverter circuit that is positioned on an outer side of the motor in a radial direction. The motor includes a rotor rotatable around the shaft, a stator facing the rotor, and a housing accommodating the rotor and the stator. The housing includes a heat sink that is located on an outer surface and includes a first flow channel to cause the oil delivered from the pump to flow. The inverter circuit comes into thermal contact with the heat sink. ## Claims ### Claim at position 1 1-22. (canceled) ### Claim 23 A pump apparatus comprising: a motor including a shaft disposed along a central axis extending in an axial direction; a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges an oil; and an inverter circuit that is positioned on an outer side of the motor in a radial direction; wherein the motor includes: a rotor rotatable around the shaft; a stator disposed to face the rotor; and a housing accommodating the rotor and the stator; the housing includes a heat sink on an outer surface; the heat sink includes a first flow channel to cause the oil delivered from the pump to flow; and the inverter circuit comes into thermal contact with the heat sink. ### Claim 24 A pump apparatus comprising: a motor including a shaft rotatably supported about a central axis extending in an axial direction; a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges an oil; and an inverter circuit that is positioned on an outer side of the motor in a radial direction; wherein the motor includes: a rotor rotatable around the shaft; a stator disposed to face the rotor; and a housing accommodating the rotor and the stator; the housing includes a heat sink on an outer surface; the heat sink includes a second flow channel to cause the oil delivered from the pump to flow; the motor further includes a motor side suction port to cause the oil delivered from the second flow channel into the motor; the second flow channel is connected to the motor side suction port; and the motor includes a third flow channel to cause the oil suctioned into the motor through the motor side suction port to flow to the stator. ### Claim 25 (depends on 24) The pump apparatus according to claim 24, wherein the housing includes an additional heat sink that is separate from the heat sink on the outer surface; the additional heat sink includes a first flow channel to cause the oil delivered from the pump to flow; an additional inverter circuit that is separate from the inverter circuit is disposed on an outer side of the motor in the radial direction; and the additional inverter circuit comes into thermal contact with the additional heat sink. ### Claim 26 (depends on 23) The pump apparatus according to claim 23, wherein the heat sink is separate from the housing and comes into thermal contact with the housing. ### Claim 27 (depends on 23) The pump apparatus according to claim 23, wherein a pump side suction port to suction the oil into the pump is provided in the pump; and the pump side suction port is provided in a negative pressure region of the pump. ### Claim 28 (depends on 27) The pump apparatus according to claim 27, wherein the pump side suction port is provided in a pump cover disposed to face a surface on one side in the axial direction of a pump rotor provided inside the pump. ### Claim 29 (depends on 27) The pump apparatus according to claim 27, wherein the pump side suction port is provided on a side surface of the pump. ### Claim 30 (depends on 23) The pump apparatus according to claim 23, wherein a pump side delivery port to deliver the oil to the first flow channel is provided in the pump; and the pump side delivery port is provided in a pressurization region of the pump. ### Claim 31 (depends on 30) The pump apparatus according to claim 30, wherein the pump side delivery port is provided in a pump body of the pump disposed to face the motor. ### Claim 32 (depends on 23) The pump apparatus according to claim 23, wherein the pump includes: a pump body including a penetration hole through which the shaft passes and being disposed to face the motor; a pump side delivery port to deliver the oil to the first flow channel; and a fifth flow channel to deliver the oil to the inside of the motor through the pump side delivery port using pressurization of the pump; and the fifth flow channel passes through a gap between the penetration hole and the shaft passing through the penetration hole. ### Claim 33 (depends on 30) The pump apparatus according to claim 30, wherein the pump side delivery port and the first flow channel are directly connected to each other. ### Claim 34 (depends on 30) The pump apparatus according to claim 30, wherein the motor includes a space portion capable of being filled with the oil delivered through the pump side delivery port; and the space portion and the first flow channel are connected to each other. ### Claim 35 (depends on 30) The pump apparatus according to claim 30, wherein a fourth flow channel to cause the oil delivered through the pump side delivery port to flow is provided between the stator and the rotor; and the fourth flow channel is connected to a motor side discharge port provided in the motor. ### Claim 36 (depends on 35) The pump apparatus according to claim 35, wherein the motor includes: a sixth flow channel to discharge the oil inside the motor through the motor side discharge port; and a bearing held by the other end portion of the housing in the axial direction and rotatably supporting the shaft; and the sixth flow channel passes through a gap between the shaft and the bearing. ### Claim 37 (depends on 24) The pump apparatus according to claim 24, wherein the motor side suction port is provided on a side surface of the housing and on an outer side of the other end of the stator in the axial direction. ### Claim 38 (depends on 24) The pump apparatus according to claim 24, wherein the motor side suction port is provided in a bottom portion of the housing provided in the other end portion of the housing in the axial direction. ### Claim 39 (depends on 23) The pump apparatus according to claim 23, wherein the inverter circuit and the housing come into contact with each other via an insulating heat dissipator. ### Claim 40 (depends on 23) The pump apparatus according to claim 23, wherein the inverter circuit and the heat sink come into contact with each other via an insulating heat dissipator. ### Claim 41 (depends on 39) The pump apparatus according to claim 39, wherein a heat radiator provided in the inverter circuit comes into contact with the housing via the insulating heat dissipator. ### Claim 42 (depends on 40) The pump apparatus according to claim 40, wherein a heat radiator provided in the inverter circuit comes into contact with the heat sink via the insulating heat dissipator.