WO2024134974A1 - 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
WO2024134974A1
WO2024134974A1 PCT/JP2023/029751 JP2023029751W WO2024134974A1 WO 2024134974 A1 WO2024134974 A1 WO 2024134974A1 JP 2023029751 W JP2023029751 W JP 2023029751W WO 2024134974 A1 WO2024134974 A1 WO 2024134974A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
motor
rotor
stator
cover
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/JP2023/029751
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
翔一 高田
健太郎 吉田
達哉 齋藤
友之 上野
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
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Sintered Alloy Ltd
Sumitomo Electric Industries 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, Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Sintered Alloy Ltd
Priority to DE112023005247.6T priority Critical patent/DE112023005247T5/de
Priority to US18/728,091 priority patent/US12560166B2/en
Priority to JP2023579821A priority patent/JP7779938B2/ja
Priority to KR1020247024069A priority patent/KR20250121236A/ko
Priority to CN202380014727.2A priority patent/CN118541546A/zh
Publication of WO2024134974A1 publication Critical patent/WO2024134974A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • 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
    • 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
    • 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
    • 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
    • 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
    • F04C2240/80—Other components
    • F04C2240/805—Fastening means, e.g. bolts

Definitions

  • the present disclosure relates to a pump assembly.
  • This application claims priority based on Japanese Patent Application No. 2022-202207 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 includes an axial gap motor having a first stator, a motor rotor, and a motor shaft, and a first pump having a first pump rotor configured to be rotated by the motor rotor.
  • the first stator includes an annular first yoke and a plurality of first teeth arranged on a first surface of the first yoke.
  • the first pump is disposed in a first internal space surrounded by the plurality of first teeth.
  • 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. 6 is a cross-sectional view of the pump assembly of the first embodiment taken along the line VI-VI in FIG.
  • FIG. 7 is a schematic configuration diagram illustrating an arrangement state of a first pump in a pump assembly according to the second embodiment.
  • FIG. 8 is a schematic cross-sectional view of a pump assembly according to the third embodiment.
  • FIG. 9 is a schematic cross-sectional view of a pump assembly according to the fourth embodiment.
  • a pump assembly may be placed in a narrow space such as an automobile, etc. Therefore, even when an axial gap motor is used, a pump assembly having an even more compact length along the axial line is required.
  • One of the objectives of the present disclosure is to provide a pump assembly that is more compact in size along the axis of the motor shaft than conventional pump assemblies.
  • the pump assembly of the present disclosure is more compact than conventional pump assemblies.
  • the pump assembly of the present disclosure includes an axial gap motor having a first stator, a motor rotor, and a motor shaft, and a first pump having a first pump rotor configured to be rotated by the motor rotor.
  • the first stator includes an annular first yoke and a plurality of first teeth arranged on a first surface of the first yoke.
  • the first pump is arranged in a first internal space surrounded by the plurality of first teeth.
  • a first pump is disposed in a first internal space of an 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 first pump is disposed in the first internal space. That is, the first 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 first pump is unlikely to leak outside the pump assembly. Therefore, the pump assembly described in ⁇ 1> above has excellent quietness.
  • the temperature of the first pump disposed in the first internal space of the axial gap motor is likely to rise due to heat generation from the axial gap motor.
  • the temperature of the first pump rises, the temperature of the fluid in the first 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 first pump disposed in the first internal space has a high heat capacity due to its structure. Therefore, the first pump is likely to receive heat generated by the axial gap motor and can suppress heat generation from the axial gap motor.
  • the fluid in the present disclosure may be a liquid, a gas, or a mixture of gas and liquid.
  • the first pump rotor may be coaxially fixed to the motor shaft.
  • the motor shaft of the motor rotor also serves as the drive shaft of the pump rotor. This reduces the number of parts in the pump assembly, making it even more compact.
  • the first pump rotor rotates in perfect synchronization with the rotation of the motor rotor, it is easy to control the rotation speed of the first pump rotor, i.e., the flow rate of the fluid, using the axial gap motor.
  • the first 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 first pump rotor.
  • the first direction is a direction along the axis of the motor shaft and away from the motor rotor.
  • the inlet port and outlet port are arranged in the radial direction, the inlet port and outlet port are arranged in the gaps between the multiple first teeth lined up on the annular first 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 arranged in the radial direction increase the spacing between the multiple first teeth, making it easier to increase the diameter of the stator core.
  • the first pump may be an internal gear pump having an external gear and an internal gear
  • the external gear may be the first 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 arrange in the first internal space, which has size restrictions.
  • the internal gear pump has better space efficiency than other pumps of the same size. Therefore, the pump assembly described in ⁇ 4> above is compact, yet easy to increase the flow rate of the fluid.
  • the axial gap motor may include a motor housing that houses the first stator and the motor rotor
  • the internal gear pump may include a pump housing that houses the external gear and the internal gear.
  • the motor housing includes a base portion to which the first yoke is fixed.
  • the pump housing includes a body, a pump cover, and a bolt.
  • the body includes a cylindrical portion that covers the outer periphery of the internal gear, a bottom portion that seals a first end face of the cylindrical portion, and an annular flange portion that extends from the vicinity of the second end face of the cylindrical portion on the outer periphery of the cylindrical portion toward the outside of the cylindrical portion.
  • the pump cover seals an opening of the cylindrical portion at the second end face.
  • the bolt fixes the pump cover to the annular flange portion.
  • the annular flange portion constitutes the base portion.
  • the pump cover of the pump housing is fixed with bolts to the annular flange portion integrated with the body of the pump housing. Therefore, there is no need to provide bolt holes for placing bolts in the cylindrical portion covering the outer periphery of the internal gear.
  • the cylindrical portion that does not require bolt holes can be made thin.
  • the outer diameter of the cylindrical portion can be reduced or the inner diameter of the cylindrical portion can be increased accordingly. If the outer diameter of the cylindrical portion is reduced without changing the inner diameter of the cylindrical portion, the outer diameter of the pump assembly can be reduced without reducing the capacity of the internal gear pump. If the inner diameter of the cylindrical portion is increased without changing the outer diameter of the cylindrical portion, the capacity of the internal gear pump can be increased without increasing the outer diameter of the pump assembly.
  • the first pump may be a vane pump, and the first pump rotor may have a plurality of vanes.
  • a vane pump with a first pump rotor having multiple vanes is compact. This vane pump is easy to place in the first internal space, which has size restrictions. In addition, because the vane pump has excellent sealing properties, it can easily pump gas, liquid, or a mixture of gas and liquid.
  • a second pump having a second pump rotor configured to be rotated by the motor rotor may be provided, and the axial gap motor may further include a second stator that sandwiches the motor rotor between itself and the first stator.
  • the second stator includes an annular second yoke and a plurality of second teeth arranged on a second surface of the second yoke.
  • the second pump is disposed in a second internal space surrounded by the plurality of second teeth.
  • An axial gap motor in which one motor rotor is sandwiched between a first stator and a second stator, generates high torque.
  • Such an axial gap motor is called a single rotor/double stator type axial gap motor.
  • the pump assembly described in ⁇ 7> above is equipped with a first pump and a second pump that are independent of each other. Therefore, the pump assembly described in ⁇ 7> above can pump two independent systems of fluid, for example.
  • the first pump and the second pump are disposed in the first internal space and the second internal space, respectively, within the axial gap motor, the pump assembly described in ⁇ 7> above is compact.
  • 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 Figs. 5 and 6, 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 therebetween 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 shape.
  • 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 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 motor shaft 20 is larger than the length of the first stator 4 along the motor shaft 20.
  • the first cover 2B is a disk-shaped member that seals the first end of the peripheral wall portion 2A.
  • the first cover 2B is an independent part from the peripheral wall portion 2A.
  • the first end is an 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. That is, the first cover 2B functions as a base portion 2Bb to which the first stator 4 is fixed.
  • a part of the first cover 2B in this example constitutes the first cover 5B of the pump housing 59 described later.
  • 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 part independent of the peripheral wall portion 2A, or may be a part integral with the peripheral wall portion 2A.
  • the second cover 2C prepared separately from the peripheral wall portion 2A is fitted into the peripheral wall portion 2A, so that the peripheral wall portion 2A and the second cover 2C are integrated. Therefore, the motor shaft 20 penetrates 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 inside 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 inside 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 Fig. 4.
  • a first cover 5B (Figs. 5 and 6) of a pump housing 59, which will be described later, is omitted in Fig. 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 arranged 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.
  • the peripheral wall portion 5A is a cylindrical member.
  • the outer peripheral contour of the peripheral wall portion 5A seen 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. A part of the bolt hole 9h described later is formed in the peripheral wall portion 5A. The center of the arc of the outer peripheral contour is shifted from the center of the motor housing 29 to the upper side in FIG.
  • the pump housing 59 can be arranged in the first internal space 21 while ensuring the strength of the pump housing 59.
  • the center of the arc of the outer peripheral contour of the peripheral wall portion 5A does not have to coincide with the center of rotation of the internal gear 56.
  • the center of the arc of the outer 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 is a component independent of the peripheral wall portion 5A.
  • the first cover 5B may be a component integral with the peripheral wall portion 5A.
  • the first cover 5B may also be a component integral with the first cover 2B of the motor housing 29.
  • the first cover 5B is fitted into a through hole of the annular base portion 2Bb that constitutes part of the first cover 2B of the motor housing 29.
  • the first cover 5B and the base portion 2Bb into which the first cover 5B is fitted constitute the first cover 2B of the motor housing 29.
  • Through holes that constitute the inlet port 51 and the outlet port 52 are formed in the first cover 5B.
  • a recess is formed on the inner surface of the first cover 5B.
  • the end of the motor shaft 20 is rotatably fitted 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 is an independent part from the peripheral wall portion 5A.
  • the second cover 5C may be an integral part with 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 motor shaft 20 passes through the second cover 5C.
  • a bearing 26 is disposed between the motor shaft 20 and the through hole through which the motor shaft 20 passes. Therefore, the motor shaft 20 is supported rotatably relative to the second cover 5C.
  • a seal member that prevents fluid from leaking from inside the pump housing 59 may be disposed at the position of the bearing 26.
  • the peripheral wall portion 5A, the first cover 5B, and the second cover 5C are integrated by bolts 9.
  • the bolt holes 9h in which the bolts 9 are arranged extend from the first cover 5B through the peripheral wall portion 5A to the second cover 5C.
  • the number of bolt holes 9h in this example is three.
  • the three bolt holes 9h are arranged at equal intervals so as to surround the internal gear 56.
  • the bolts 9 connect the first cover 5B, the peripheral wall portion 5A, and the second cover 5C.
  • the first cover 5B is integrated with the first cover 2B of the motor housing 29. Therefore, by connecting the first cover 5B, the peripheral wall portion 5A, and the second cover 5C with the bolts 9, the first end of the peripheral wall portion 2A of the motor housing 29 is sealed by the first cover 2B.
  • the bolt hole 9h in this example has a thin diameter portion 95 in which the shaft portion 90 of the bolt 9 is disposed, and a thick diameter portion 96 in which the head 91 of the bolt 9 is disposed.
  • a thread groove is formed in at least a portion of the thin diameter portion 95 that corresponds to the second cover 5C.
  • a thread groove may also be formed in at least a portion of the thin diameter portion 95 that corresponds to the peripheral wall portion 5A.
  • the head 91 is fixed by abutting against the step between the thin diameter portion 95 and the thick diameter portion 96.
  • the head 91 is stored inside the thick diameter portion 96 and does not protrude from the end face of the first cover 5B. Therefore, the head 91 does not increase the dimension along the axis of the pump assembly 1.
  • a tool hole is formed in the end face of the head 91, into which a tool for rotating the bolt 9 is inserted.
  • the shape of the tool hole in this example is hexagonal.
  • the shape of the tool hole is not particularly limited
  • 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 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. 7.
  • Fig. 7 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. 8.
  • Fig. 8 can be viewed in the same manner as Fig. 5.
  • 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.
  • 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.
  • a pump assembly 1 in which the configurations of a motor housing 29 and a pump housing 59 are different from those in the first embodiment will be described with reference to Fig. 9.
  • the configuration other than the motor housing 29 and the pump housing 59 is the same as that in the first embodiment.
  • FIG. 9 is a cross-sectional view of the pump assembly 1 of this example taken along the line VI-VI in FIG. 4. The position of the bolt 9 in this example is different from that in the first embodiment.
  • the pump housing 59 in this example comprises a body 8 and a pump cover 8C.
  • the body 8 is a cylindrical part with a bottom, comprising a cylindrical portion 80, a bottom portion 81, and an annular flange portion 82.
  • the boundary between the cylindrical portion 80 and the bottom portion 81, and the boundary between the cylindrical portion 80 and the annular flange portion 82 are indicated by dashed double-dashed lines.
  • the cylindrical portion 80 is a portion that covers the outer periphery of the internal gear 56. In other words, the cylindrical portion 80 corresponds to the peripheral wall portion 5A of the pump housing 59 in embodiment 1.
  • the bottom portion 81 is a portion that seals the first end face of the cylindrical portion 80 and is positioned facing the motor rotor 3. A through hole is formed in the bottom portion 81 through which the motor shaft 20 passes. In other words, the bottom portion 81 corresponds to the second cover 5C of the pump housing 59 in embodiment 1.
  • the annular flange portion 82 is a portion that extends from the vicinity of the second end face on the outer periphery of the cylindrical portion 80 toward the outside of the cylindrical portion 80. The second end face is the end face opposite to the first end face.
  • the outside of the cylindrical portion 80 is in the direction away from the central axis of the cylindrical portion 80.
  • the annular flange portion 82 is roughly in a circular ring shape.
  • the first yoke 40 of the first stator 4 is fixed to the surface of the annular flange portion 82 that faces the motor rotor 3. That is, the annular flange portion 82 corresponds to the base portion 2Bb of the motor housing 29 in the first embodiment.
  • the body 8 in which the cylindrical portion 80, the bottom portion 81, and the annular flange portion 82 are integrated is expected to contribute to reducing the number of assembly steps for the pump assembly 1 and to reducing the cost of the pump assembly 1 by reducing the number of parts.
  • the pump cover 8C seals the opening 80h that opens into the second end face of the tubular portion 80.
  • the pump cover 8C corresponds to the first cover 5B of the pump housing 59 in embodiment 1.
  • the outer diameter of the pump cover 8C is larger than the inner diameter of the opening 80h.
  • This pump cover 8C and the annular flange portion 82 correspond to the first cover 2B of the motor housing 29 in embodiment 1.
  • the pump cover 8C is fixed to the annular flange portion 82 of the body 8 by the bolts 9.
  • the bolt holes 9h in which the bolts 9 are placed penetrate the pump cover 8C and reach the annular flange portion 82.
  • the shaft portion 90 does not overlap the tubular portion 80 of the body 8, and the bolt holes 9h for placing the bolts 9 are not formed in the tubular portion 80.
  • the tubular portion 80 is thinner than the peripheral wall portion 5A in the first embodiment by the amount that the bolt holes 9h are not formed.
  • the outer diameter of the tubular portion 80 can be made smaller than that of the configuration of the first embodiment by the amount that the tubular portion 80 is thinner.
  • the outer diameter of the pump assembly 1 can be made smaller without reducing the capacity of the first pump 5.
  • the outer diameter of the pump assembly 1 is the dimension of the pump assembly 1 in a direction perpendicular to the axis of the motor shaft 20.
  • the inner diameter of the cylindrical portion 80 may be made smaller than in the configuration of embodiment 1 by the amount that the cylindrical portion 80 is thinner. For example, by increasing the inner diameter of the cylindrical portion 80 without changing the outer diameter of the cylindrical portion 80 compared to the configuration of embodiment 1, the capacity of the first pump 5 can be increased without increasing the outer diameter of the pump assembly. In addition, the outer diameter of the cylindrical portion 80 may be made smaller and the inner diameter of the cylindrical portion 80 may be made larger compared to the configuration of embodiment 1.
  • the configuration of the motor housing 29 and pump housing 59 shown in embodiment 4 can also be applied to the pump assembly 1 equipped with the single rotor/double stator type motor 2 shown in embodiment 3.

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/JP2023/029751 2022-12-19 2023-08-17 ポンプアセンブリ Ceased WO2024134974A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE112023005247.6T DE112023005247T5 (de) 2022-12-19 2023-08-17 Pumpenanordnung
US18/728,091 US12560166B2 (en) 2022-12-19 2023-08-17 Pump assembly with the pump disposed within the plurality of teeth of the motor stator
JP2023579821A JP7779938B2 (ja) 2022-12-19 2023-08-17 ポンプアセンブリ
KR1020247024069A KR20250121236A (ko) 2022-12-19 2023-08-17 펌프 어셈블리
CN202380014727.2A CN118541546A (zh) 2022-12-19 2023-08-17 泵组件

Applications Claiming Priority (2)

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JP2022202207 2022-12-19
JP2022-202207 2022-12-19

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WO2024134974A1 true WO2024134974A1 (ja) 2024-06-27

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PCT/JP2023/029751 Ceased WO2024134974A1 (ja) 2022-12-19 2023-08-17 ポンプアセンブリ

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US (1) US12560166B2 (https=)
JP (1) JP7779938B2 (https=)
KR (1) KR20250121236A (https=)
CN (1) CN118541546A (https=)
DE (1) DE112023005247T5 (https=)
WO (1) WO2024134974A1 (https=)

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JP7653287B2 (ja) * 2021-03-31 2025-03-28 ミネベアミツミ株式会社 モータ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0914157A (ja) * 1995-06-26 1997-01-14 Jidosha Kiki Co Ltd オイルポンプ
JP2014173443A (ja) * 2013-03-06 2014-09-22 Asmo Co Ltd 電動ポンプ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19721528A1 (de) * 1997-05-22 1998-11-26 Still Gmbh Elektrische Maschine und Verfahren zur Montage der elektrischen Maschine an einem Aggregat
JP4272112B2 (ja) * 2004-05-26 2009-06-03 株式会社日立製作所 モータ一体型内接歯車式ポンプ及び電子機器
JP2011058441A (ja) * 2009-09-11 2011-03-24 Jtekt Corp 電動ポンプユニット
JP5771958B2 (ja) * 2010-11-29 2015-09-02 株式会社富士通ゼネラル ポンプ装置
US11035360B2 (en) * 2018-02-14 2021-06-15 Stackpole International Engineered Products, Ltd. Gerotor with spindle
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0914157A (ja) * 1995-06-26 1997-01-14 Jidosha Kiki Co Ltd オイルポンプ
JP2014173443A (ja) * 2013-03-06 2014-09-22 Asmo Co Ltd 電動ポンプ

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JPWO2024134974A1 (https=) 2024-06-27
CN118541546A (zh) 2024-08-23
US12560166B2 (en) 2026-02-24
JP7779938B2 (ja) 2025-12-03
US20250101981A1 (en) 2025-03-27
KR20250121236A (ko) 2025-08-12
DE112023005247T5 (de) 2025-10-23

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