WO2024202910A1 - 電動ポンプ - Google Patents

電動ポンプ Download PDF

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Publication number
WO2024202910A1
WO2024202910A1 PCT/JP2024/007651 JP2024007651W WO2024202910A1 WO 2024202910 A1 WO2024202910 A1 WO 2024202910A1 JP 2024007651 W JP2024007651 W JP 2024007651W WO 2024202910 A1 WO2024202910 A1 WO 2024202910A1
Authority
WO
WIPO (PCT)
Prior art keywords
protective cover
electric pump
motor
housing
pump
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/JP2024/007651
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
田中　縁
史恭 加藤
裕介 大森
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.)
KYB Corp
Original Assignee
KYB Corp
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 KYB Corp filed Critical KYB Corp
Priority to JP2025510062A priority Critical patent/JPWO2024202910A1/ja
Publication of WO2024202910A1 publication Critical patent/WO2024202910A1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • 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

Definitions

  • the present invention relates to an electric pump.
  • JP2010-112302A discloses an electric pump unit in which a pump, an electric motor for driving the pump, and a motor controller are incorporated within a unit housing.
  • the electric motor is a DC brushless sensorless motor with three-phase windings, and has a stator in which a core and an insulator are incorporated. A coil is wound around the insulator, and a controller circuit board is fixed to it. Electronic components are arranged on the surface of the board facing the electric motor.
  • the controller board is fixed to the insulator of the electric motor and faces the electric motor, so heat from the coil of the electric motor is transferred to the board and electronic components on the board during operation. As a result, the temperatures of the board and electronic components rise when the electric pump unit is operating, which may adversely affect the operation of the electric pump unit.
  • the purpose of the present invention is to stabilize the operation of an electric pump.
  • an electric pump includes a pump section that discharges liquid, a motor section that drives the pump section, a control section that controls the motor section, and a housing that contains the pump section, the motor section, and the control section, and the control section has a board on which electronic components are mounted, and a protective cover that covers the motor section is provided between the motor section and the board.
  • FIG. 1 is a perspective view of an electric pump according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line II-II in FIGS.
  • FIG. 3 is a plan view of the pump portion.
  • FIG. 4 is a perspective view showing a state in which the protective cover is attached to the housing.
  • FIG. 5 is a perspective view showing a state in which the substrate is attached to the protective cover and the housing.
  • the electric pump 100 is mounted, for example, on a vehicle and discharges a coolant (liquid) for cooling an electric motor mounted on the vehicle, or discharges oil (liquid) for lubricating gears mounted on the vehicle.
  • the electric pump 100 may be used as a fluid pressure supply source that discharges a working fluid (liquid) for driving equipment.
  • the electric pump 100 may also be mounted on industrial machinery other than a vehicle.
  • FIG. 1 is a perspective view of the electric pump 100
  • FIG. 2 is a cross-sectional view of the electric pump 100 taken along line II-II in FIGS. 1 and 4.
  • the electric pump 100 includes a pump section 10 that discharges liquid, a motor section 20 that drives the pump section 10 by rotating a drive shaft 1, a control section 30 that controls the motor section 20, and a housing 40 that houses the pump section 10, the motor section 20, and the control section 30.
  • the control section 30, the motor section 20, and the pump section 10 are arranged in this order from the top in FIGS. 1 and 2.
  • the axial direction of the drive shaft 1 will also be referred to simply as the "axial direction”
  • the radial direction of the drive shaft 1 will also be referred to simply as the "radial direction”.
  • FIG. 3 is a plan view of the pump section 10 seen from below in FIGS. 1 and 2, with the pump cover section 43 of the housing 40 covering the pump section 10 removed.
  • the pump section 10 is an internal gear pump having an inner rotor 11 to which the drive shaft 1 is connected, and an outer rotor 12 arranged on the outside of the inner rotor 11.
  • the inner rotor 11 and the outer rotor 12 are housed in the housing 40 (specifically, the housing main body section 41 described below), are arranged eccentrically with respect to each other, and are covered by the pump cover section 43 of the housing 40.
  • the inner rotor 11 is arranged so that its center overlaps with the drive shaft 1
  • the outer rotor 12 is arranged so that its center is offset from the drive shaft 1.
  • the inner rotor 11 has a plurality of external teeth 11a on its outer peripheral surface
  • the outer rotor 12 has a plurality of internal teeth 12a on its inner peripheral surface that come into sliding contact with the external teeth 11a.
  • the external teeth 11a and the internal teeth 12a are formed with different numbers of teeth, and a pump chamber 13 is defined by adjacent external teeth 11a of the inner rotor 11 and internal teeth 12a of the outer rotor 12. Multiple pump chambers 13 are formed in the pump section 10.
  • the pump cover part 43 that covers the pump part 10 is formed with a suction port (not shown) that guides liquid from the outside to the pump chamber 13, and a discharge port (not shown) that guides liquid discharged from the pump chamber 13 to the outside.
  • a suction port (not shown) that guides liquid from the outside to the pump chamber 13
  • a discharge port (not shown) that guides liquid discharged from the pump chamber 13 to the outside.
  • the motor section 20 has an annular stator 21 and a rotor 25 arranged radially inside the stator 21.
  • the stator 21 and the rotor 25 are housed in a housing 40 (specifically, a housing main body section 41, which will be described later).
  • the stator 21 has an annular stator core 22 arranged to surround the rotor 25, and a coil wire 23 wound around the stator core 22.
  • the stator core 22 has an annular yoke portion 22a that contacts the inner peripheral surface of the housing 40 (housing body portion 41), and a plurality of teeth portions 22b that protrude radially inward from the yoke portion 22a and are arranged at predetermined intervals in the circumferential direction.
  • the yoke portion 22a is formed with a plurality of protruding portions 22c that protrude in the axial direction toward the control portion 30, and each of the protruding portions 22c abuts against a protective cover 70 described later.
  • the coil wire 23 is wound around the teeth portions 22b of the stator core 22. As a result, a U-phase coil, a V-phase coil, and a W-phase coil corresponding to the three-phase drive current are formed on each tooth portion 22b. The ends of each coil wire 23 are connected to the control portion 30.
  • the rotor 25 has a rotor core 25a that is provided on the outer circumferential surface of the drive shaft 1 and rotates together with the drive shaft 1, and a number of permanent magnets 25b that are provided on the outer circumferential surface of the rotor core 25a.
  • the permanent magnets 25b are arranged in an annular shape, with north and south poles arranged alternately.
  • the rotor 25 rotates around the drive shaft 1 as an axis due to the interaction between the magnetized state of the stator core 22 of the stator 21 and the permanent magnets 25b. This drives the pump section 10.
  • the control unit 30 controls the current supplied to the stator 21 to drive the motor unit 20.
  • the control unit 30 has electronic components 31 and a board 32 on which the electronic components 31 are mounted and to which the coil wire 23 of the motor unit 20 is connected.
  • the electronic components 31 include, for example, a magnetic detection sensor such as a Hall element that can detect changes in magnetism that change according to the rotation of the drive shaft 1, and a calculation unit that calculates the rotation angle and rotation speed of the drive shaft 1 based on the detection value of the magnetic detection sensor.
  • the control unit 30 controls the direction of the current flowing through the coil wire 23 of the stator 21 according to the rotation angle of the drive shaft 1, and controls the magnitude of the current supplied to the coil wire 23 so that the rotation speed of the drive shaft 1 becomes the target rotation speed input from the outside.
  • the board 32 is fixed to the housing 40 by being fastened together with the protective cover 70 by a fastening member 80 (see FIG. 4) as described later.
  • the electronic components 31 are mounted on both sides of the board 32.
  • a heat dissipation section 33 that dissipates heat from the board 32 is provided on the side of the board 32 opposite the motor section 20 (the upper side in FIG. 2).
  • the housing 40 has a housing body portion 41 having an opening 41a, a cover portion 42 that covers the opening 41a, and a pump cover portion 43 that covers the pump portion 10.
  • the housing main body 41 has an insertion hole 41b through which the drive shaft 1 is inserted, an annular motor accommodating recess 41c in which the motor section 20 is accommodated, a bearing accommodating recess 41d provided radially inside the motor accommodating recess 41c in which the bearing 50 and the like are accommodated, and a pump accommodating recess 41e in which the pump section 10 is accommodated.
  • the insertion hole 41b is formed extending axially through the opening 41a, the bearing accommodating recess 41d, and the pump accommodating recess 41e.
  • the motor accommodating recess 41c is formed continuous with the opening 41a, and the annular yoke section 22a of the stator core 22 of the motor section 20 is provided in contact with its inner circumferential surface.
  • the bearing accommodating recess 41d is formed radially inside the motor accommodating recess 41c, and is formed in a stepped shape having a large diameter section and a small diameter section.
  • the bearing accommodating recess 41d accommodates a bearing 50 that is provided on the outer circumferential surface of the drive shaft 1 and rotatably supports the drive shaft 1, a snap ring 55 that fixes the bearing 50, a washer 60, and an oil seal 65.
  • the pump accommodating recess 41e is formed with its center offset from the insertion hole 41b and accommodates the inner rotor 11 and outer rotor 12 of the pump section 10.
  • a plurality of fastening holes 41f are formed on the end surface of the pump accommodating recess 41e to which fastening members (not shown) for attaching the pump cover section 43 are fastened (see FIG. 3).
  • the cover portion 42 has a protrusion 42a that protrudes on the side opposite the housing main body portion 41 (upward in FIG. 2).
  • the protrusion 42a is formed hollow, and the board 32 and heat dissipation portion 33 of the control portion 30 are housed in the hollow portion of the protrusion 42a.
  • the board 32 housed in the housing 40 is electrically connected to the outside by a connector (not shown) provided on the housing main body portion 41.
  • the cover portion 42 is fixed to the housing main body portion 41 by a fastening member 81.
  • the pump cover portion 43 is provided so as to cover the pump accommodating recess 41e.
  • the pump cover portion 43 is formed with an insertion hole (not shown) through which a fastening member (not shown) is inserted, and the pump cover portion 43 is fixed to the housing main body portion 41 by the fastening member.
  • the pump cover portion 43 is formed with a suction port and a discharge port as described above.
  • the protective cover 70 is provided between the motor unit 20 and the substrate 32 of the control unit 30, and covers the motor unit 20.
  • the protective cover 70 is made of resin, but the protective cover 70 may be made of other materials.
  • FIG. 4 is a perspective view of the protective cover 70 as seen from the substrate 32 side (upper side in FIG. 2), with the control unit 30 and cover portion 42 omitted.
  • the protective cover 70 is formed so as to cover the entire surface of the motor portion 20.
  • the protective cover 70 covers the coil wire 23 wound around the teeth portion 22b of the stator core 22 of the motor portion 20, and is formed so that the coil wire 23 does not directly face the substrate 32.
  • the protective cover 70 has an annular main body 71, a storage recess 75 formed inside the main body 71 in which the electronic component 31 is stored, a fixing portion 72 formed to protrude from the main body 71 and to which the board 32 is fixed by a fastening member 80, a protruding portion 73 inserted into a through hole (not shown) formed in the board 32, and a claw portion 74 that engages with the housing 40 and positions the protective cover 70 relative to the housing 40.
  • the main body 71 is formed so as to abut against each of the multiple protrusions 22c of the stator core 22 of the motor section 20 and cover the coil wire 23 of the motor section 20 (see Figure 2).
  • Two fixing parts 72 are formed on the outer periphery of the main body part 71 and protrude from the main body part 71 toward the cover part 42 of the housing 40, and the end part 72a abuts against the end face of the opening 41a of the housing main body part 41 and the substrate 32.
  • the protective cover 70 is fixed to the housing main body part 41 by fastening the substrate 32 and the end part 72a of the fixing part 72 together with a fastening member 80 through insertion holes (not shown) formed in both parts. This reduces the number of parts compared to when the substrate 32 and the protective cover 70 are fixed to the housing 40 separately, and the protective cover 70 can be provided with a simple configuration.
  • the end part 72a is formed thick so as to be exposed from the housing main body part 41. Therefore, the substrate 32 is exposed from the housing main body part 41 and fixed to the fixing part 72 (see FIG. 2 and FIG. 5). This creates a gap between the board 32 and the housing body 41, so that with the cover 42 of the housing 40 removed, the board 32 can be visually checked to see if there are any abnormalities in the mounting of the electronic components 31.
  • Two protrusions 73 are formed on the main body 71 and protrude from the main body 71 toward the cover 42 of the housing 40.
  • the protrusions 73 are cylindrical pins that are inserted into positioning through holes (not shown) formed in the substrate 32 to position the substrate 32 (see FIG. 5). This allows for positioning between the substrate 32 and the protective cover 70 with a simple configuration.
  • Two claws 74 are formed on the main body 71 and protrude from the main body 71 toward the cover 42 of the housing 40.
  • the claws 74 have an axial protruding portion 74a that protrudes axially from the main body 71 toward the cover 42, a radial protruding portion 74b that protrudes radially outward from the axial protruding portion 74a, and an engaging portion 74c that protrudes from the radial protruding portion 74b toward the opening 41a of the housing main body 41.
  • a concave engaged portion 41g is formed in the opening 41a of the housing main body 41, and the engaging portion 74c of the claws 74 engages with the engaged portion 41g of the housing main body 41 to position the protective cover 70. This allows for positioning between the housing 40 and the protective cover 70 with a simple configuration.
  • the accommodating recess 75 is formed on the surface of the protective cover 70 facing the cover portion 42 of the housing 40.
  • the accommodating recess 75 is recessed from the main body portion 71 towards the motor portion 20, and accommodates the electronic component 31 (specifically, the electronic component 31 mounted on the motor portion 20 side of the board 32) as shown in FIG. 2.
  • the protective cover 70 also has a step portion 76 (see FIG. 2) that abuts against the motor unit 20 and positions it relative to the motor unit 20, and a guide portion 77 through which the coil wire 23 of the motor unit 20 is inserted and which guides the coil wire 23 to the substrate 32.
  • the step portion 76 is formed on the outer peripheral surface of the accommodating recess 75.
  • the step portion 76 is formed to protrude radially inward from the teeth portion 22b of the stator core 22 and abuts against the flange portion 22d that supports the coil wire 23.
  • the protective cover 70 is positioned by fitting the step portion 76 into the radially inner side of the teeth portion 22b (flange portion 22d). This allows the motor portion 20 and the protective cover 70 to be positioned with a simple structure.
  • a plurality of guide portions 77 are formed side by side on the main body portion 71 and protrude from the main body portion 71 towards the cover portion 42 of the housing 40.
  • the guide portions 77 are formed cylindrically, and the U-phase coil, V-phase coil, and W-phase coil of the coil wire 23 are respectively inserted through the guide portions 77.
  • the ends of each coil wire 23 are connected to the board 32 of the control unit 30 through the guide portions 77. This allows the coil wire 23 of the motor portion 20 to be guided to the board 32 without using a bus bar or the like, reducing the number of parts of the electric pump 100 and making it more compact.
  • a protective cover 70 is provided between the motor section 20 and the circuit board 32. Therefore, when the electric pump 100 is operating, heat generated in the motor section 20 due to heat generation from the coil wire 23, etc. is blocked by the protective cover 70, and is prevented from being transmitted to the circuit board 32 and electronic components 31 of the control unit 30. This prevents the temperature of the circuit board 32 and electronic components 31 from rising, stabilizing the operation of the electric pump 100. Furthermore, not only the heat generated in the motor section 20, but also vibrations and noise are prevented from being transmitted to the circuit board 32 and electronic components 31 of the control unit 30.
  • the motor section 20 is covered with the protective cover 70, so that foreign matter is prevented from entering the motor section 20 and adversely affecting the operation of the electric pump 100.
  • the pump section 10 and the motor section 20 are housed in the housing body section 41 and the pump cover section 43 of the housing 40, and the claw section 74 of the protective cover 70 is engaged with the engaged section 41g of the housing body section 41 to fix them as an assembly and transported, and the control section 30 and the cover section 42 are assembled at the transport destination.
  • the electric pump 100 of this embodiment is provided with the protective cover 70 in advance at the time of transportation, there is no need to attach a dedicated cover to prevent foreign matter from entering the motor section 20 during transportation.
  • the protective cover 70 functions even during transportation of the electric pump 100.
  • the protective cover 70 is made of resin. Since resin has higher insulating properties than other materials such as metal, the heat generated in the motor section 20 when the electric pump 100 is in operation is more reliably prevented from being transmitted to the board 32 and electronic components 31 of the control section 30.
  • a protective cover 70 is provided between the motor section 20 and the circuit board 32.
  • heat generated in the motor section 20 due to heat generation in the coil wire 23, etc. is blocked by the protective cover 70, and is prevented from being transmitted to the circuit board 32 and electronic components 31 of the control unit 30. This prevents the temperature of the circuit board 32 and electronic components 31 from rising, stabilizing the operation of the electric pump 100.
  • the electric pump 100 is provided with a protective cover 70.
  • the protective cover 70 is not limited to the above configuration as long as it is provided between the motor unit 20 and the board 32.
  • the protective cover 70 may be fixed to the housing 40 separately from the board 32 without being fastened together with the board 32.
  • the protective cover 70 may not have a thick fixing portion 72 and may be fixed to the board 32 or the housing 40 without the board 32 being exposed from the housing main body portion 41.
  • the protrusion 73 for positioning the board 32, the claw portion 74 for positioning the board 32 relative to the housing 40, the housing recess 75 for housing the electronic component 31, the step portion 76 for positioning the motor unit 20, and the guide portion 77 for guiding the coil wire 23 to the board 32 are not essential components of the protective cover 70.
  • the protective cover 70 is formed so as to cover the entire surface of the motor unit 20. This more reliably suppresses the heat generated in the motor unit 20 during operation of the electric pump 100 from being transmitted to the board 32 and electronic components 31 of the control unit 30.
  • the protective cover 70 may be formed so as to cover only a part of the motor unit 20. Even with this configuration, the temperature rise of the board 32 and electronic components 31 during operation of the electric pump 100 is suppressed, and the protective cover 70 is made smaller, thereby making it possible to reduce the weight of the electric pump 100.
  • the electric pump 100 comprises a pump section 10 that discharges liquid, a motor section 20 that drives the pump section 10, a control section 30 that controls the motor section 20, and a housing 40 that houses the pump section 10, the motor section 20, and the control section 30.
  • the control section 30 has a board 32 on which electronic components 31 are mounted, and a protective cover 70 that covers the motor section 20 is provided between the motor section 20 and the board 32.
  • a protective cover 70 is provided between the motor unit 20 and the circuit board 32. Therefore, the heat generated in the motor unit 20 when the electric pump 100 is in operation is blocked by the protective cover 70, and is prevented from being transmitted to the circuit board 32 and electronic components 31 of the control unit 30. This stabilizes the operation of the electric pump 100.
  • the substrate 32 and the protective cover 70 are fastened together by the fastening member 80 and fixed to the housing 40.
  • the protective cover 70 can be provided with a simple configuration by fastening the substrate 32 and the protective cover 70 together.
  • the housing 40 has a housing main body 41 as a main body having an opening 41a, and a cover 42 that covers the opening 41a
  • the protective cover 70 has a fixing portion 72 to which the substrate 32 is fixed by a fastening member 80, and the fixing portion 72 is formed so as to be exposed from the housing main body 41, and the substrate 32 is exposed from the housing main body 41 and fixed to the fixing portion 72.
  • the protective cover 70 has a protrusion 73 that is inserted into a through hole formed in the substrate 32 to position the substrate 32.
  • the protrusion 73 of the protective cover 70 allows for simple positioning between the substrate 32 and the protective cover 70.
  • the protective cover 70 has a claw portion 74 that engages with the housing 40 and determines its position relative to the housing 40.
  • the claw portion 74 of the protective cover 70 allows for simple positioning between the housing 40 and the protective cover 70.
  • the protective cover 70 has a storage recess 75 in which the electronic component 31 is stored.
  • the electric pump 100 can be made compact thanks to the storage recess 75 of the protective cover 70.
  • the protective cover 70 has a step portion 76 that abuts against the motor unit 20 and determines its position relative to the motor unit 20.
  • the step portion 76 of the protective cover 70 allows for simple positioning between the motor unit 20 and the protective cover 70.
  • the protective cover 70 has a guide portion 77 through which the coil wire 23 of the motor portion 20 is inserted and which guides the coil wire 23 to the substrate 32.
  • the coil wire 23 of the motor section 20 can be guided to the substrate 32 without using a bus bar or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
PCT/JP2024/007651 2023-03-28 2024-02-29 電動ポンプ Ceased WO2024202910A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025510062A JPWO2024202910A1 (https=) 2023-03-28 2024-02-29

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-051949 2023-03-28
JP2023051949 2023-03-28

Publications (1)

Publication Number Publication Date
WO2024202910A1 true WO2024202910A1 (ja) 2024-10-03

Family

ID=92905253

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/007651 Ceased WO2024202910A1 (ja) 2023-03-28 2024-02-29 電動ポンプ

Country Status (2)

Country Link
JP (1) JPWO2024202910A1 (https=)
WO (1) WO2024202910A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159568U (https=) * 1988-04-21 1989-11-06
JP2012029477A (ja) * 2010-07-23 2012-02-09 Panasonic Electric Works Co Ltd モータ及びそれを備えたポンプ及び液体循環装置
JP2013199922A (ja) * 2012-02-21 2013-10-03 Aisin Seiki Co Ltd 電動ポンプ
US20170363052A1 (en) * 2016-06-15 2017-12-21 Tricore Corporation Electric fuel pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01159568U (https=) * 1988-04-21 1989-11-06
JP2012029477A (ja) * 2010-07-23 2012-02-09 Panasonic Electric Works Co Ltd モータ及びそれを備えたポンプ及び液体循環装置
JP2013199922A (ja) * 2012-02-21 2013-10-03 Aisin Seiki Co Ltd 電動ポンプ
US20170363052A1 (en) * 2016-06-15 2017-12-21 Tricore Corporation Electric fuel pump

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