WO2024135000A1 - ポンプアセンブリ - Google Patents

ポンプアセンブリ Download PDF

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Publication number
WO2024135000A1
WO2024135000A1 PCT/JP2023/031907 JP2023031907W WO2024135000A1 WO 2024135000 A1 WO2024135000 A1 WO 2024135000A1 JP 2023031907 W JP2023031907 W JP 2023031907W WO 2024135000 A1 WO2024135000 A1 WO 2024135000A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
motor
rotor
housing
pump assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/031907
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
翔一 高田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Sintered Alloy Ltd
Original Assignee
Sumitomo Electric Sintered Alloy Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Sintered Alloy Ltd filed Critical Sumitomo Electric Sintered Alloy Ltd
Priority to CN202380016039.XA priority Critical patent/CN118525435A/zh
Priority to DE112023005251.4T priority patent/DE112023005251T5/de
Priority to KR1020247024039A priority patent/KR20250124022A/ko
Priority to JP2023579824A priority patent/JP7716161B2/ja
Publication of WO2024135000A1 publication Critical patent/WO2024135000A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/04—Machines with one rotor and two stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0215—Electrical pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238—Rotary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor

Definitions

  • the present disclosure relates to a pump assembly.
  • This application claims priority based on Japanese Patent Application No. 2022-202208 dated December 19, 2022, and incorporates all of the contents of the above-mentioned Japanese application by reference.
  • An axial gap motor has a stator, a motor rotor, and a motor shaft.
  • the magnetic flux from the stator to the rotor flows parallel to the axis of the motor shaft.
  • Axial gap motors have the advantage of being small in length along the axis.
  • Patent Document 1 discloses a pump assembly that combines an axial gap motor and an electric pump that pumps fluid.
  • the axial gap motor and the electric pump are arranged side by side in a direction along the axis of the motor shaft. Taking advantage of the small size along the axis of the axial gap motor, such a pump assembly is compact. In a pump assembly that uses a radial gap motor, the size along the axis of the motor shaft is large.
  • the pump assembly of the present disclosure comprises an axial gap motor having a stator, a motor rotor, and a motor shaft, a pump rotor configured to be rotated by the motor rotor, and a pump housing that houses the pump rotor.
  • the stator comprises an annular yoke and a plurality of teeth arranged on a first surface of the yoke.
  • the pump is disposed in an internal space surrounded by the plurality of teeth.
  • the pump housing comprises a flow path space formed inside the pump housing, and a leak flow path that opens from the flow path space toward the motor rotor.
  • FIG. 1 is a schematic perspective view of a pump assembly according to a first embodiment.
  • FIG. 2 is a schematic plan view of the pump assembly according to the first embodiment.
  • FIG. 3 is a schematic exploded perspective view of an axial gap motor provided in the pump assembly according to the first embodiment.
  • FIG. 4 is a schematic configuration diagram illustrating an arrangement state of the first pump in the pump assembly according to the first embodiment.
  • 5 is a cross-sectional view of the pump assembly of the first embodiment taken along the line VV shown in FIG.
  • FIG. 6 is a schematic configuration diagram illustrating an arrangement state of a first pump in a pump assembly according to the second embodiment.
  • FIG. 7 is a schematic cross-sectional view of a pump assembly according to the third embodiment.
  • pump assemblies are used to supply oil to the drive mechanism of an automobile.
  • the pump assembly is placed in a limited, narrow space such as an engine room of the automobile. Therefore, even when an axial gap motor is used, a pump assembly with a more compact length along the axis is required.
  • Axial gap motors generate heat during operation, which can lead to a decrease in performance. If a separate cooling mechanism for cooling the axial gap motor is added to the pump assembly, the pump assembly will become larger.
  • One of the objectives of this disclosure is to provide a compact pump assembly that is less susceptible to malfunctions caused by heat generation.
  • the pump assembly of the present disclosure is less susceptible to failure due to heat generation and is more compact than conventional pump assemblies.
  • the pump assembly of the present disclosure comprises an axial gap motor having a stator, a motor rotor, and a motor shaft, a pump rotor configured to be rotated by the motor rotor, and a pump housing that houses the pump rotor.
  • the stator comprises an annular yoke and a plurality of teeth arranged on a first surface of the yoke.
  • the pump is disposed in an internal space surrounded by the plurality of teeth.
  • the pump housing comprises a flow path space formed inside the pump housing, and a leak flow path that opens from the flow path space toward the motor rotor.
  • a pump is disposed in the internal space of the axial gap motor surrounded by a plurality of first teeth. Therefore, the length along the axis of the motor shaft in the pump assembly described in ⁇ 1> above is smaller than the length along the axis of the motor shaft in a conventional pump assembly.
  • the pump rotor rotated by the motor rotor may be fixed coaxially to the motor shaft.
  • the pump assembly described in ⁇ 1> above a portion of the fluid flowing through the flow path space of the pump housing leaks into the motor rotor through the leak flow path.
  • the leaked fluid spreads over the entire surface of the motor rotor due to the centrifugal force of the motor rotor, or splashes inside the axial gap motor and adheres to the stator.
  • the fluid removes heat from the motor rotor and stator, cooling the axial gap motor. Therefore, the pump assembly described in ⁇ 1> above can suppress problems associated with heat generation in the axial gap motor, even though it has a simple configuration that does not include an additional cooling mechanism.
  • the fluid in this disclosure may be a liquid, a gas, or a mixture of liquid and gas.
  • the pump is disposed in the internal space. That is, the pump is disposed inside the axial gap motor and is surrounded by the components of the axial gap motor. Therefore, the operating sound of the pump is unlikely to leak outside the pump assembly. Therefore, the pump assembly described in ⁇ 1> above has excellent quietness.
  • the temperature of the pump disposed in the internal space of the axial gap motor is likely to rise due to heat generation from the axial gap motor.
  • the temperature of the pump rises, the temperature of the fluid in the pump rises and the viscosity of the fluid decreases.
  • the load on the axial gap motor is reduced and the power consumption of the axial gap motor is reduced.
  • the pump disposed in the internal space has a high heat capacity. Therefore, the pump is likely to receive heat generated by the axial gap motor and can suppress heat generation by the axial gap motor.
  • the pump housing has a through hole connecting the inside and outside of the pump housing, a part of the motor shaft is disposed inside the pump housing through the through hole, and the leak flow path may be formed by a gap between the through hole and the motor shaft.
  • the gap between the pump housing's through hole and the motor shaft is very narrow. By using this gap as a leak path, it is possible to prevent excessive fluid leakage from the pump. Therefore, the axial gap motor can be cooled without compromising the pump's ability to pump fluid.
  • the pump may have an inlet port and an outlet port, and the inlet port and the outlet port may be arranged in a first direction as viewed from the pump rotor.
  • the first direction is a direction along the axis of the motor shaft and away from the motor rotor.
  • stator core Since there is no motor rotor in the first direction as viewed from the pump rotor, it is easy to arrange the inlet and outlet ports. In addition, since the inlet and outlet ports are arranged in the first direction, the stator core does not need to be made larger in diameter.
  • the inlet port and outlet port are arranged in the radial direction, the inlet port and outlet port are arranged in the gaps between multiple teeth lined up on the annular yoke.
  • the radial direction is the direction perpendicular to the axis of the motor shaft and away from the axis. Inlet ports and outlet ports along the radial direction increase the spacing between the multiple teeth, making it easier to increase the diameter of the stator core.
  • the axial gap motor may include a motor housing, and the motor housing may include a drain passage connecting the inside and outside of the motor housing.
  • the pump assembly described in ⁇ 4> above can prevent malfunctions caused by fluid accumulating inside the axial gap motor.
  • the pump may be an internal gear pump having an external gear and an internal gear, and the external gear may be the pump rotor.
  • An internal gear pump in which an external gear is arranged inside an internal gear, is compact.
  • This internal gear pump is easy to place in an internal space with size restrictions.
  • the internal gear pump is more space efficient than other pumps of the same size. Therefore, the pump assembly described in ⁇ 5> above is compact and yet easy to increase the flow rate of fluid.
  • the pump may be a vane pump, and the pump rotor may have multiple vanes.
  • Vane pumps which have a pump rotor with multiple vanes, are compact. They are easy to place in internal spaces with size restrictions. In addition, because vane pumps have excellent sealing properties, they can easily pump gases, liquids, or mixtures of gases and liquids.
  • the pump housing may have a return flow passage connecting the internal space and the inlet port.
  • the return flow path allows any fluid that leaks into the internal space of the axial gap motor to be returned to the flow path space of the pump. This means that the fluid that cools the axial gap motor is not wasted.
  • the pump assembly 1 shown in Figures 1 and 2 includes an axial gap motor 2 and a first pump 5. From the outside of the pump assembly 1, a motor housing 29 of the axial gap motor 2 and a pump housing 59 of the first pump 5 are visible. An inlet port 51 and an outlet port 52 are opened in the pump housing 59. As shown in the plan view of Figure 2, an external gear 55 and an internal gear 56 of the first pump 5, which will be described later, are visible behind the inlet port 51 and the outlet port 52. Each component of the pump assembly 1 will be described below. In the following description, the "axial gap motor” will be simply referred to as a "motor”.
  • the motor 2 includes a first stator 4, a motor rotor 3, and a motor shaft 20. As shown in Fig. 5, the first stator 4 and the motor rotor 3 are arranged coaxially with the motor shaft 20. The first stator 4 and the motor rotor 3 face each other with a gap in between in a direction along the axis of the motor shaft 20.
  • the motor 2 of this example is a single-rotor, single-stator type motor including one first stator 4 and one motor rotor 3.
  • the first stator 4 comprises a first yoke 40, a plurality of first teeth 41, and a plurality of first coils 42.
  • the first yoke 40 is a plate material configured in an annular shape.
  • the first teeth 41 are cylindrical.
  • the first teeth 41 protrude from the planar first surface 40s of the first yoke 40.
  • the first teeth 41 have the same shape and size.
  • the shape of each first tooth 41 is, for example, a rectangular column or a cylindrical column.
  • the first stator 4 in this example is, for example, configured from an integrated powder compact. Unlike this example, the first stator 4 may be configured from a plurality of divided pieces.
  • the end face of the first tooth 41 faces the magnet 31 of the motor rotor 3, which will be described later.
  • a first coil 42 is disposed on the outer circumferential surface of the first tooth 41. When a current flows through the first coil 42, the first stator 4 is excited, generating a rotating magnetic field. In this example, the ends of the windings that make up the first coil 42 are not shown.
  • the motor rotor 3 comprises a base plate 30 and a number of magnets 31.
  • the base plate 30 is an annular plate material through which the motor shaft 20 passes.
  • the base plate 30 and the motor shaft 20 are fixed, and the base plate 30 and the motor shaft 20 rotate coaxially.
  • the base plate 30 comprises a base surface 30s that faces the first surface 40s of the first yoke 40.
  • the magnets 31 are fixed to the base surface 30s, for example, by adhesive.
  • the magnets 31 are permanent magnets.
  • the magnets 31 are arranged at approximately equal intervals around the axis of the motor shaft 20.
  • the shape of the magnets 31 is, for example, flat.
  • the planar shape of the magnets 31 corresponds, for example, to the shape of the end faces of the first teeth 41.
  • the magnets 31 are magnetized in a direction along the axis of the motor shaft 20.
  • the magnetization directions of two magnets 31 adjacent to each other around the axis of the motor shaft 20 are opposite to each other.
  • the magnets 31 are attracted to or repelled by the first teeth 41 by the rotating magnetic field generated by the first stator 4, causing the motor rotor 3 to rotate relative to the first stator 4.
  • the motor 2 further includes a motor housing 29.
  • the first stator 4 and the motor rotor 3 described above are disposed inside the motor housing 29.
  • a portion of the motor shaft 20 is also disposed inside the motor housing 29.
  • the entire motor shaft 20 may be disposed inside the motor housing 29.
  • the motor housing 29 in this example is composed of a peripheral wall portion 2A, a first cover 2B, and a second cover 2C.
  • the peripheral wall portion 2A and the second cover 2C may be an integral part.
  • the peripheral wall portion 2A is a cylindrical member.
  • the inner diameter of the peripheral wall portion 2A is larger than the outer diameter of the first stator 4.
  • the length of the peripheral wall portion 2A along the axial direction of the motor shaft 20 is larger than the length of the first stator 4 along the motor shaft 20.
  • the first cover 2B is an annular member that seals the first end of the peripheral wall portion 2A.
  • the first end is the end that is close to the first yoke 40 of the first stator 4.
  • the first yoke 40 is fixed to the first cover 2B.
  • a part of the pump housing 59 described below penetrates the first cover 2B.
  • a flange is provided on the outer periphery of the first cover 2B.
  • the protruding height of the pump housing 59 is the same as or lower than the end face of the flange. Therefore, the protruding portion of the pump housing 59 is contained in a concave space formed inside the flange of the first cover 2B.
  • the second cover 2C is an annular member that seals the second end of the peripheral wall portion 2A.
  • the second end is the end opposite to the first end.
  • the second cover 2C may be a member independent of the peripheral wall portion 2A, or may be integrated with the peripheral wall portion 2A.
  • the motor shaft 20 passes through the second cover 2C.
  • a bearing 25 is disposed between the second cover 2C and the motor shaft 20, and the motor shaft 20 is supported rotatably relative to the second cover 2C.
  • a seal member that suppresses leakage of fluid from within the motor housing 29 may be disposed at the position of the bearing 25. Unlike this example, when the entire motor shaft 20 is disposed within the motor housing 29, the inner surface of the second cover 2C has a recess into which the end of the motor shaft 20 is fitted.
  • FIG. 4 is a diagram for explaining the arrangement of the first pump 5 in the pump assembly 1, and some members of the pump assembly 1 are omitted or simplified.
  • a first cover 2B of a motor housing 29 and a motor rotor 3 are omitted in Figure 4.
  • a first cover 5B ( Figure 5) of a pump housing 59, which will be described later, is omitted in Figure 4, and the inside of the first pump 5 is exposed.
  • the first stator 4 an inlet port 51, and an outlet port 52 are indicated by two-dot chain lines.
  • the first pump 5 pumps a fluid.
  • the fluid is a liquid.
  • the fluid is machine oil.
  • the first pump 5 includes a first pump rotor 50 configured to be rotated by the motor rotor 3.
  • the first pump 5 is disposed in a first internal space 21 surrounded by a plurality of first teeth 41.
  • the first pump 5 in this example is an internal gear pump having an external gear 55 and an internal gear 56.
  • the external gear 55 is a disk-shaped gear with teeth on its outer periphery.
  • the tooth profile of the external gear 55 is formed, for example, by a trochoid curve.
  • the internal gear 56 is an annular gear with teeth on its inner periphery.
  • the external gear 55 is disposed inside the internal gear 56, and the teeth of the external gear 55 and the teeth of the internal gear 56 mesh with each other.
  • the external gear 55 is the first pump rotor 50.
  • the external gear 55 and the internal gear 56 are disposed inside the pump housing 59.
  • the pump housing 59 in this example is composed of a peripheral wall portion 5A, a first cover 5B, and a second cover 5C.
  • a flow path space 5S is formed through which the fluid flows.
  • the flow path space 5S also includes the gap between the external gear 55 and the internal gear 56.
  • the peripheral wall portion 5A is a cylindrical member. As shown in FIG. 4, the peripheral contour of the peripheral wall portion 5A viewed from the direction along the axis of the peripheral wall portion 5A has a shape like a part of a circle cut in a straight line. The center of the arc of the peripheral contour is shifted from the center of the motor housing 29 to the upper side of FIG. 4 and coincides with the center of rotation of the internal gear 56 described later. By cutting the peripheral wall portion 5A, the pump housing 59 can be placed in the first internal space 21 while ensuring the strength of the pump housing 59. Unlike this example, the center of the arc of the peripheral contour of the peripheral wall portion 5A does not have to coincide with the center of rotation of the internal gear 56. In addition, the center of the arc of the peripheral contour of the peripheral wall portion 5A may or may not coincide with the center of rotation of the external gear 55.
  • the inner peripheral contour of the peripheral wall portion 5A is circular when viewed from a direction along the axis of the peripheral wall portion 5A.
  • the inner diameter of the peripheral wall portion 5A is slightly larger than the outer diameter of the internal gear 56. Therefore, the internal gear 56 can rotate with its outer peripheral surface in contact with the inner peripheral surface of the peripheral wall portion 5A.
  • the rotation axis of the internal gear 56 is stabilized by being supported by the inner peripheral surface of the peripheral wall portion 5A.
  • the first cover 5B is a plate-shaped member that seals the first end of the peripheral wall portion 5A.
  • the first cover 5B may be an integral part of the first cover 2B of the motor housing 29.
  • the first cover 5B may also be an integral part of the peripheral wall portion 5A.
  • the first end is the end closest to the first yoke 40.
  • the first cover 5B has through holes that form the inlet port 51 and the outlet port 52.
  • the inner surface of the first cover 5B has a recess. The end of the motor shaft 20 fits rotatably into the recess.
  • the second cover 5C is a plate-shaped member that seals the second end of the peripheral wall portion 5A.
  • the second cover 5C may be an integral part of the peripheral wall portion 5A.
  • the second end is the end opposite to the first end.
  • a recess 5D is formed on the surface of the second cover 5C that faces the first pump rotor 50.
  • the two recesses 5D are provided at positions that face each other across the motor shaft 20.
  • the shape of each recess 5D when viewed from a direction along the axis of the motor shaft 20 is generally arc-shaped.
  • the shapes of the two recesses 5D may be different or the same.
  • the recess 5D reduces the sliding area between the external gear 55 and the second cover 5C and the sliding area between the internal gear 56 and the second cover 5C, thereby reducing the torque loss of the first pump 5.
  • the second cover 5C has a through hole 5h through which the motor shaft 20 passes.
  • a bearing 26 is arranged between the through hole 5h and the motor shaft 20. Therefore, the motor shaft 20 is supported rotatably relative to the second cover 5C.
  • the gap between the through hole 5h and the motor shaft 20 is very narrow. In this example, this gap is used as the leak flow path 8. Details of the leak flow path 8 will be described later.
  • the external gear 55 is fixed coaxially to the motor shaft 20.
  • the rotation axis of the external gear 55 coincides with the rotation axis of the motor shaft 20.
  • the rotation axis of the external gear 55 also coincides with the axis of the motor housing 29.
  • the external gear 55 rotates in perfect synchronization with the rotation of the motor rotor 3. Therefore, the rotation speed of the external gear 55 can be controlled by controlling the rotation speed of the motor rotor 3.
  • the flow rate of the fluid pumped by the first pump 5 changes depending on the rotation speed of the external gear 55.
  • the rotation axis of the internal gear 56 which is positioned by the peripheral wall portion 5A of the pump housing 59, is shifted upward in the drawing from the rotation axis of the external gear 55. Therefore, as the external gear 55 rotates, the internal gear 56 rotates, and the gap between the external gear 55 and the internal gear 56 moves in the rotation direction of the motor shaft 20.
  • An inlet port 51 and an outlet port 52 open into the gap between the external gear 55 and the internal gear 56. Therefore, the fluid that flows into the gap from the inlet port 51 is transported in the rotation direction of the motor shaft 20 and is discharged from the outlet port 52 to the outside of the first pump 5.
  • the inlet port 51 and the outlet port 52 are arranged in approximately symmetrical positions across the motor shaft 20.
  • the inlet port 51 and the outlet port 52 are arranged in a first direction as viewed from the first pump rotor 50, i.e., the external gear 55.
  • the first direction is a direction along the axis of the motor shaft 20 and a direction away from the motor rotor 3.
  • the inlet port 51 and the outlet port 52 are formed in the first cover 5B arranged in the first direction from the first pump rotor 50.
  • the inlet port 51 and the outlet port 52 in this example extend in the first direction and open at the end face of the first cover 5B.
  • the inlet port 51 and the outlet port 52 may be bent, for example, in an L-shape. In that case, the inlet port 51 and the outlet port 52 may open in a direction intersecting the first direction. Since the rotating motor rotor 3 does not exist at the position where the inlet port 51 and the outlet port 52 are arranged, the inlet port 51 and the outlet port 52 are easily arranged.
  • the inlet port 51 and the outlet port 52 may extend radially.
  • the radial direction is a direction perpendicular to the axis of the motor shaft 20 and away from the axis of the motor shaft 20.
  • the inlet port 51 and the outlet port 52 each extend from between two adjacent first teeth 41 to the outside of the pump assembly 1.
  • the first pump 5 is disposed in the first internal space 21 of the motor 2. That is, the length of the pump assembly 1 of this example along the motor shaft 20 does not increase, despite the inclusion of the first pump 5.
  • Such a compact pump assembly 1 is easy to place in a narrow space, such as the interior of an automobile.
  • the first pump 5 generates operating noise.
  • the operating noise is, for example, the contact noise between the external gear 55 and the internal gear 56, and the pulsating noise generated when the fluid is pumped.
  • the external gear 55 and the internal gear 56 which are the source of the operating noise, are surrounded by the pump housing 59.
  • the first pump 5 is disposed inside the motor 2. Therefore, in the pump assembly 1 of this example, the operating noise of the first pump 5 is unlikely to leak outside the pump assembly 1.
  • the pump assembly 1 of this example has excellent quietness.
  • the motor 2 generates heat during operation.
  • the heat generated by the motor 2 tends to increase the temperature of the first pump 5, which is disposed in the first internal space 21 of the motor 2.
  • the temperature of the first pump 5 increases, the temperature of the fluid in the first pump 5 increases and the viscosity of the fluid decreases.
  • the load on the motor 2 is reduced and the power consumption of the motor 2 decreases.
  • the load on the motor 2 tends to be reduced early after the start of the motor 2 when the temperature of the fluid is low.
  • the first pump 5, which is disposed in the first internal space 21, has a high thermal capacity due to its structure. Therefore, the first pump 5 can easily absorb the heat generated by the motor 2 and suppress the heat generation of the motor 2.
  • the pump assembly 1 includes a leak passage 8.
  • the leak passage 8 is for intentionally leaking a portion of the fluid flowing through the passage space 5S into the motor housing 29.
  • the leak flow path 8 in this example is formed by the gap between the through hole 5h of the pump housing 59 and the motor shaft 20.
  • the through hole 5h opens from the flow path space 5S toward the motor rotor 3. Therefore, the leak flow path 8 also opens from the flow path space 5S toward the motor rotor 3. Since this leak flow path 8 is very narrow, there is no excessive leakage of fluid from the flow path space 5S, and the pumping capacity of the first pump 5 is not impaired.
  • the leak flow path 8 may be a through hole that penetrates the second cover 5C in the direction along the thickness. In this case, too, the leak flow path 8 opens toward the motor rotor 3.
  • the inner diameter of this leak flow path 8 is set to a size that does not cause the pressure of the fluid in the flow path space 5S to drop too much.
  • FIG 5 an example of the movement path of the fluid that has leaked into the motor housing 29 through the leak flow path 8 is shown by a thick straight arrow.
  • the fluid in the flow path space 5S leaks into the motor rotor 3 through the leak flow path 8.
  • the bearing 26 is disposed at the position of the leak flow path 8. Therefore, specifically, the fluid leaks into the motor rotor 3 through the gap between the motor shaft 20 and the bearing 26, and through gaps inside the bearing 26.
  • the fluid leaking from the leak flow path 8 adheres to the base plate 30 of the motor rotor 3.
  • FIG. 5 only the side of the magnet 31 on the back side of the cross section of the base plate 30 is visible, and as shown in FIG. 3, the magnet 31 is not arranged in the center part of the base plate 30. Therefore, the fluid leaking from the leak flow path 8 adheres to the base surface 30s of the base plate 30, not to the magnet 31.
  • the fluid adhering to the base surface 30s moves in a direction away from the rotation axis of the motor rotor 3 due to the centrifugal force of the motor rotor 3.
  • a part of the moving fluid scatters in the first internal space 21 and adheres to the first stator 4.
  • the dispersed fluid in the motor housing 29 absorbs heat from the components of the motor 2 and cools the motor 2. Therefore, even though the pump assembly 1 of this example does not have an additional cooling mechanism, it is less likely to have problems associated with heat generation.
  • the pump assembly 1 of this example further includes a drain passage 80 that connects the inside and outside of the motor housing 29.
  • the drain passage 80 is provided in the first cover 5B.
  • the drain passage 80 is for discharging the fluid in the motor housing 29 to the outside. If the fluid has a high viscosity, the fluid accumulated inside the motor 2 makes it difficult for the motor rotor 3 to rotate.
  • the drain passage 80 prevents the fluid from inhibiting the rotation of the motor rotor 3 by discharging the fluid in the motor housing 29 to the outside.
  • the opening of the drain passage 80 facing the outside faces vertically downward. Therefore, the fluid is quickly discharged from the drain passage 80 by gravity.
  • the drain passage 80 may be provided in the peripheral wall portion 2A.
  • the drain passage 80 provided in the peripheral wall portion 2A extends in a direction intersecting the motor shaft 20, for example, perpendicular to the motor shaft 20.
  • fluid can be stored in the motor housing 29 up to the height of the drain passage 80, making it easier to cool the motor 2.
  • the pump assembly 1 may be arranged so that the motor shaft 20 is aligned horizontally, and the opening of the drain passage 80 may be oriented vertically downward to actively discharge fluid from within the motor housing 29.
  • the pump assembly 1 may include a return flow passage 9 indicated by a two-dot chain line.
  • the return flow passage 9 connects the first internal space 21 and the inlet port 51.
  • the return flow passage 9 allows fluid leaked into the motor housing 29 to be returned to the flow passage space 5S of the first pump 5.
  • the return flow passage 9 illustrated in Fig. 5 is provided in the pump housing 59. Specifically, the return flow passage 9 is provided in the first cover 5B.
  • the first pump 5 in the pump assembly 1 is not limited to an internal gear pump.
  • the first pump 5 may be an external gear pump, an impeller pump, a diaphragm pump, a vane pump, or a piston pump.
  • a pump assembly 1 including a vane pump as the first pump 5 will be described with reference to Fig. 6.
  • Fig. 6 can be viewed in the same way as Fig. 4.
  • the vane pump includes a first pump rotor 50 having a plurality of vanes 58.
  • the vanes 58 are configured to be freely movable forward and backward by, for example, magnetic force or centrifugal force.
  • the shape of the inner peripheral surface of the pump housing 59 in which the first pump rotor 50 is housed is roughly elliptical. Unlike this example, the shape of the inner peripheral surface of the pump housing 59 may be circular.
  • the vane pump has excellent sealing properties, so it can easily pump gas, liquid, or a mixture of gas and liquid.
  • the pump assembly 1 in this example has two inlet ports 51 and two outlet ports 52.
  • the inlet ports 51 and the outlet ports 52 are arranged alternately around the axis of the motor shaft 20. There may be only one inlet port 51 and one outlet port 52.
  • a pump assembly 1 including a single rotor/double stator type motor 2 will be described with reference to Fig. 7.
  • Fig. 7 can be viewed in the same manner as Fig. 5.
  • details of the leak flow path 8 and the fluid movement path are omitted.
  • the motor 2 of this example further includes a second stator 6 that sandwiches the motor rotor 3 between itself and the first stator 4.
  • the configuration of the second stator 6 is the same as that of the first stator 4. That is, the second stator 6 includes an annular second yoke 60, a plurality of second teeth 61, and a plurality of second coils 62.
  • the second teeth 61 are disposed on the second surface 60s of the second yoke 60.
  • the second surface 60s is a surface that faces the first surface 40s of the first yoke 40.
  • the end surfaces of the second teeth 61 have the same shape as the end surfaces of the first teeth 41, and face the end surfaces of the first teeth 41. That is, the first stator 4 and the second stator 6 are disposed symmetrically with respect to the motor rotor 3.
  • the motor rotor 3 in this example also has multiple magnets 31 on the surface facing the second stator 6. Unlike this example, the magnets 31 may be embedded in the base plate 30. In that case, one magnet 31 corresponds to both the first stator 4 and the second stator 6.
  • a single rotor, double stator type motor 2 is usually more space efficient than a single rotor, single stator type motor 2.
  • the motor 2 has a second internal space 22 surrounded by a plurality of second teeth 61.
  • the second pump 7 is arranged in this second internal space 22.
  • the first pump 5 and the second pump 7 are arranged symmetrically with respect to the motor rotor 3.
  • the second pump 7 is a pump independent of the first pump 5.
  • the second pump 7 has the same configuration as the first pump 5.
  • the second pump 7 is an internal gear pump having an external gear 75 and an internal gear 76.
  • the external gear 75 is a second pump rotor 70 configured to be rotated by the motor rotor 3.
  • the second pump rotor 70 is fixed coaxially to the motor shaft 20.
  • the motor shaft 20 also serves as the rotation axis of the first pump rotor 50 and the second pump rotor 70.
  • the external gear 75 and the internal gear 76 are arranged inside the pump housing 79.
  • the first pump 5 and the second pump 7 may be pumps of a type other than an internal gear pump.
  • the first pump 5 and the second pump 7 may be pumps of different types.
  • the first pump 5 may be an internal gear pump and the second pump 7 may be a vane pump.
  • the inlet port 71 and the outlet port 72 extend along the axis of the motor shaft 20.
  • the opening of the inlet port 71 and the opening of the outlet port 72 are located away from the motor rotor 3. Since the rotating motor rotor 3 is not present at the positions where the inlet port 71 and the outlet port 72 are located, it is easy to arrange the inlet port 71 and the outlet port 72.
  • the peripheral wall portion 2A of the motor housing 29 is large enough to accommodate both the first pump 5 and the second pump 7. Therefore, the pump assembly 1 of this example is compact despite having two pumps.
  • a drain passage 80 is provided in the peripheral wall portion 2A.
  • the pump assembly 1 is positioned so that this drain passage 80 faces vertically downward, making it easier to discharge the fluid in the motor housing 29 to the outside.
  • the first cover 2B of the motor housing 29 in this example has the same configuration as the first cover 2B in embodiment 1.
  • the second cover 2C of the motor housing 29 in this example has the same configuration as the first cover 2B. Therefore, a portion of the pump housing 79 penetrates the second cover 2C, but the pump housing 79 does not protrude from the end face of the second cover 2C. Unlike this example, the pump housing 59 may protrude from the end face of the first cover 2B, and the pump housing 79 may protrude from the end face of the second cover 2C.
  • the pump assembly 1 of this example which has the configuration described above, can pump two independent fluid systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
PCT/JP2023/031907 2022-12-19 2023-08-31 ポンプアセンブリ Ceased WO2024135000A1 (ja)

Priority Applications (4)

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CN202380016039.XA CN118525435A (zh) 2022-12-19 2023-08-31 泵组件
DE112023005251.4T DE112023005251T5 (de) 2022-12-19 2023-08-31 Pumpenbaugruppe
KR1020247024039A KR20250124022A (ko) 2022-12-19 2023-08-31 펌프 어셈블리
JP2023579824A JP7716161B2 (ja) 2022-12-19 2023-08-31 ポンプアセンブリ

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JP2022-202208 2022-12-19

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KR (1) KR20250124022A (https=)
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018062094A1 (ja) * 2016-09-30 2018-04-05 日本電産トーソク株式会社 ポンプ装置
JP2020143657A (ja) * 2019-03-08 2020-09-10 株式会社ジェイテクト 電動ポンプ装置
WO2022239484A1 (ja) * 2021-05-14 2022-11-17 株式会社アイシン ポンプ装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2330048C (en) * 1998-04-22 2004-04-20 University Of Utah Implantable centrifugal blood pump with hybrid magnetic bearings
JP7207134B2 (ja) 2019-04-23 2023-01-18 株式会社デンソー アキシャルギャップ型のロータ及び電動ポンプ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018062094A1 (ja) * 2016-09-30 2018-04-05 日本電産トーソク株式会社 ポンプ装置
JP2020143657A (ja) * 2019-03-08 2020-09-10 株式会社ジェイテクト 電動ポンプ装置
WO2022239484A1 (ja) * 2021-05-14 2022-11-17 株式会社アイシン ポンプ装置

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DE112023005251T5 (de) 2025-10-23

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