WO2024004402A1 - Dispositif de propulsion - Google Patents

Dispositif de propulsion Download PDF

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Publication number
WO2024004402A1
WO2024004402A1 PCT/JP2023/017911 JP2023017911W WO2024004402A1 WO 2024004402 A1 WO2024004402 A1 WO 2024004402A1 JP 2023017911 W JP2023017911 W JP 2023017911W WO 2024004402 A1 WO2024004402 A1 WO 2024004402A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
motor
inverter
gap
shaft
Prior art date
Application number
PCT/JP2023/017911
Other languages
English (en)
Japanese (ja)
Inventor
優一 竹村
真吾 中田
秀明 鈴木
Original Assignee
株式会社デンソー
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
Priority claimed from JP2023014093A external-priority patent/JP2024004442A/ja
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2024004402A1 publication Critical patent/WO2024004402A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
    • B64D27/02—Aircraft characterised by the type or position of power plants
    • B64D27/24—Aircraft characterised by the type or position of power plants using steam or spring force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
    • B64D33/08—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of power plant cooling systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U20/00—Constructional aspects of UAVs
    • B64U20/90—Cooling
    • B64U20/94—Cooling of rotors or rotor motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U20/00—Constructional aspects of UAVs
    • B64U20/90—Cooling
    • B64U20/96—Cooling using air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U20/00—Constructional aspects of UAVs
    • B64U20/90—Cooling
    • B64U20/98—Cooling using liquid, e.g. using lubrication oil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64U—UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
    • B64U50/00—Propulsion; Power supply
    • B64U50/10—Propulsion
    • B64U50/19—Propulsion using electrically powered motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • 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
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the disclosure in this specification relates to a propulsion device.
  • Patent Document 1 discloses a propulsion system mounted on an aircraft.
  • This propulsion system includes a motor, an inverter, and a case.
  • the motor and inverter are arranged along the rotation axis of the motor.
  • the case has an outer wall and an inner wall.
  • the motor and inverter are housed inside the outer wall.
  • the inner wall is provided between the motor and the inverter and partitions off the space inside the outer wall.
  • Patent Document 1 there is a concern that the heat of the motor and the heat of the inverter may be trapped in the inner wall. That is, there is a concern that heat may accumulate in the boundary between the motor side and the inverter side in the propulsion system.
  • the main purpose of the present disclosure is to provide a propulsion device that can enhance the heat dissipation effect.
  • a propulsion device that propels an aircraft
  • a motor device including a motor driven to propel an aircraft and a motor housing housing the motor
  • the motor includes an inverter that converts electric power supplied to the motor, and an inverter housing that houses the inverter, and the inverter housing and the motor housing are arranged along the rotational axis of the motor in the axial direction of the rotational axis.
  • an inverter device ; a housing gap that is provided between the motor housing and the inverter housing and is open outward in the radial direction of the rotation axis;
  • a propulsion device equipped with A propulsion device equipped with.
  • a housing gap opened radially outward is provided between the motor housing and the inverter housing.
  • FIG. 3 is a diagram showing the configuration of an eVTOL in the first embodiment.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, and is a cross-sectional view of the housing gap.
  • FIG. 3 is a partially expanded view of an inverter inner circumferential wall surface of an inverter through hole.
  • FIG. 7 is a cross-sectional view of a housing gap in the second embodiment.
  • FIG. 3 is a partially expanded view of an inverter inner circumferential wall surface of an inverter through hole.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a third embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a fourth embodiment.
  • FIG. 10 is a sectional view taken along the line XX in FIG. 9, and is a cross-sectional view of the housing gap.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a fifth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a sixth embodiment.
  • FIG. 7 is a schematic perspective view of a propulsion device in a seventh embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in an eighth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a ninth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a tenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in an eleventh embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twelfth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a thirteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a fourteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a fifteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a sixteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a sixteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a seventeenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in an eighteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a nineteenth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twentieth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-first embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-second embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-third embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-fourth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-fifth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-sixth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-seventh embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-eighth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-ninth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a 30th embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a twenty-fourth embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a 31st embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a 32nd embodiment.
  • FIG. 7 is a vertical cross-sectional view of a propulsion device in a 33rd embodiment.
  • the drive system 30 shown in FIG. 1 is installed in the eVTOL 10.
  • the eVTOL 10 is an electric vertical takeoff and landing aircraft, and is capable of vertical takeoff and landing.
  • eVTOL is an abbreviation for electric Vertical Take-Off and Landing aircraft.
  • the eVTOL 10 is an aircraft that flies in the atmosphere and corresponds to a flying object.
  • the eVTOL 10 is also an electric powered aircraft and is sometimes referred to as an electric flying vehicle.
  • the eVTOL 10 is a manned aircraft on which a crew member rides.
  • the drive system 30 is a system that drives the eVTOL 10 to fly.
  • the eVTOL 10 has a fuselage 11 and a propeller 20.
  • the fuselage 11 has a fuselage main body 12 and wings 13.
  • the fuselage main body 12 is the fuselage of the fuselage 11, and has a shape that extends from front to back, for example.
  • the fuselage main body 12 has a crew compartment for a crew member to ride.
  • the wings 13 extend from the fuselage main body 12, and a plurality of wings 13 are provided in the fuselage main body 12.
  • Wing 13 is a fixed wing.
  • the plurality of wings 13 include a main wing, a tail wing, and the like.
  • a plurality of propellers 20 are provided in the aircraft body 11.
  • the eVTOL 10 is a multicopter having at least three propellers 20.
  • at least four propellers 20 are provided in the aircraft body 11.
  • the propeller 20 is provided on each of the fuselage main body 12 and the wings 13.
  • the propeller 20 rotates around the propeller axis.
  • the propeller axis is, for example, the centerline of the propeller 20.
  • the propeller 20 can cause the eVTOL 10 to generate thrust and lift. Further, the propeller 20 is sometimes referred to as a rotor or a rotating blade.
  • the propeller 20 has blades 21 and a boss 22.
  • a plurality of blades 21 are arranged in the circumferential direction of the propeller axis.
  • the boss 22 connects the plurality of blades 21.
  • the blade 21 extends from the boss 22 in the radial direction of the propeller axis.
  • the propeller 20 has a propeller shaft (not shown).
  • the propeller shaft is a rotating shaft of the propeller 20 and extends from the boss 22 along the propeller axis.
  • a propeller shaft is sometimes referred to as a propeller shaft.
  • the eVTOL 10 is a tilt rotor machine.
  • the propeller 20 can be tilted. That is, the tilt angle of the propeller 20 is adjustable.
  • the orientation of the propeller 20 is set so that the propeller axis extends in the vertical direction.
  • the propeller 20 functions as a lift rotor to generate lift on the eVTOL 10.
  • the orientation of the propeller 20 is set so that the propeller axis extends in the front-rear direction. In this case, the propeller 20 functions as a cruise rotor for generating thrust in the eVTOL 10.
  • the eVTOL 10 has an EPU 50.
  • the EPU 50 is a device that drives the propeller 20 to drive and rotate it, and corresponds to a drive device.
  • EPU is an abbreviation for Electric Propulsion Unit.
  • the EPU 50 is sometimes referred to as an electric drive device or an electric drive system.
  • the EPU 50 is provided individually for each of the plurality of propellers 20.
  • the EPUs 50 are arranged on the propeller 20 along the propeller axis. All of the plurality of EPUs 50 are fixed to the aircraft body 11.
  • the EPU 50 rotatably supports the propeller 20.
  • EPU 50 is connected to propeller 20.
  • the propeller 20 is fixed to the aircraft body 11 via the EPU 50.
  • the eVTOL 10 has a propulsion device 15.
  • the propulsion device 15 is a device for propelling the eVTOL 10.
  • the eVTOL 10 is propelled by the propulsion device 15 to be able to fly on a lift or the like.
  • the propulsion device 15 has a propeller 20 and an EPU 50. In the propulsion device 15, the propeller 20 rotates as the EPU 50 is driven.
  • the propeller 20 is fixed to the fuselage 11 via the EPU 50.
  • the EPU 50 is designed to prevent tilting relative to the propeller 20.
  • the EPU 50 can tilt relative to the aircraft body 11 together with the propeller 20.
  • the orientation of the EPU 50 is set together with the propeller 20.
  • the EPU 50 includes a motor device 60 and an inverter device 80.
  • the motor device 60 includes a motor 61 and a motor housing 70.
  • Motor housing 70 accommodates motor 61.
  • the motor 61 is a rotating electrical machine, and is a multi-phase AC motor.
  • the motor 61 is, for example, a three-phase motor.
  • the motor 61 includes a motor stator 63, a motor rotor 64, and a motor shaft 65.
  • Motor stator 63 is a stator
  • motor stator 63 is a rotor.
  • the motor shaft 65 is fixed to the motor rotor 64 and rotates together with the motor rotor 64.
  • the motor 61 is an axial gap type rotating electric machine.
  • a motor stator 63 and a motor rotor 64 are arranged in the axial direction AD.
  • the motor 61 is a double rotor type rotating electric machine.
  • two motor rotors 64 are arranged in the axial direction AD.
  • a motor stator 63 is provided between the two motor rotors 64.
  • the axial direction AD is the direction in which the motor axis Cm extends.
  • the motor axis Cm is the rotation axis of the motor rotor 64.
  • the motor rotor 64 rotates around the motor axis Cm.
  • the motor axis Cm is, for example, the center line of the motor rotor 64.
  • the motor axis Cm is also the center line of the motor 61 and the motor shaft 65.
  • rotation of the motor rotor 64 is referred to as rotation of the motor 61
  • the motor 61 rotates around the motor axis Cm.
  • the motor axis Cm corresponds to the rotation axis.
  • the axial direction AD, the radial direction RD, and the circumferential direction CD are orthogonal to each other.
  • the outer side is sometimes called the radially outer side
  • the inner side is sometimes called the radially inner side.
  • the inverter device 80 includes an inverter 81, a motor control section 82, and an inverter housing 90.
  • Inverter housing 90 accommodates inverter 81 and motor control section 82 .
  • Inverter 81 converts the power supplied to motor 61 from direct current to alternating current.
  • Inverter 81 is a multi-phase power converter.
  • Inverter 81 is, for example, a three-phase inverter.
  • the motor control unit 82 is, for example, an MCU, and controls the drive of the motor 61.
  • MCU is an abbreviation for Motor Control Unit.
  • the motor control unit 82 controls the motor 61 by controlling the inverter 81.
  • the EPU 50 has an EPU shaft 51 and a gear 53.
  • EPU shaft 51 connects motor shaft 65 and propeller 20 via gear 53.
  • the EPU shaft 51 rotates around the EPU axis Cepu.
  • the EPU axis Cepu is the center line of the EPU shaft 51.
  • the EPU shaft 51 rotates as the motor shaft 65 rotates.
  • EPU shaft 51 is connected to propeller 20.
  • the EPU axis Cepu coincides with the propeller axis. Note that the EPU axis Cepu and the motor axis Cm may be coincident with each other, or may be deviated from each other in the radial direction RD.
  • the gear 53 mechanically connects the motor shaft 65 and the EPU shaft 51. Gear 53 transmits the rotation of motor shaft 65 to EPU shaft 51.
  • the gear 53 is provided, for example, between the propeller 20 and the motor device 60 in the axial direction AD. Gear 53 has a reduction gear. Gear 53 is sometimes referred to as a gearbox.
  • a motor device 60 and an inverter device 80 are arranged in the axial direction AD. Motor device 60 and inverter device 80 are fixed to each other.
  • a motor unit 59 is formed by a motor device 60 and an inverter device 80.
  • the EPU 50 includes a motor unit 59 in addition to an EPU shaft 51 and a gear 53.
  • An air cooling type is used as a cooling method for the EPU 50.
  • the EPU 50 is cooled by gas such as external air existing outside the EPU 50.
  • the EPU 50 is cooled from the outer peripheral side by using a gas flow generated as the propeller 20 rotates.
  • the motor housing 70 is formed into a flat columnar shape as a whole.
  • the motor housing 70 is formed into a cylindrical shape.
  • the motor housing 70 is made of a metal material or the like and has thermal conductivity.
  • the outer surface 70a of the motor housing 70 has a motor outer peripheral wall surface 71a, a motor inner end wall surface 73a, and a motor outer end wall surface 74a.
  • the motor outer peripheral wall surface 71a is the outer peripheral surface of the motor housing 70 and extends in the circumferential direction CD.
  • the motor inner end wall surface 73a and the motor outer end wall surface 74a are arranged in the axial direction AD.
  • the motor outer peripheral wall surface 71a is in a state extending between the motor inner end wall surface 73a and the motor outer end wall surface 74a.
  • the motor inner end wall surface 73a faces the inverter device 80 side in the axial direction AD.
  • the motor outer end wall surface 74a faces the opposite side from the inverter device 80 in the axial direction AD.
  • the motor housing 70 has a motor outer peripheral wall 71, a motor inner end wall 73, a motor outer end wall 74, and a motor outer peripheral fin 79.
  • the motor outer peripheral wall 71 forms a motor outer peripheral wall surface 71a.
  • the motor inner end wall 73 forms a motor inner end wall surface 73a.
  • the motor outer end wall 74 forms a motor outer end wall surface 74a.
  • the motor inner end wall 73 and the motor outer end wall 74 are arranged in the circumferential direction CD.
  • the motor outer circumferential wall 71 is in a state where it spans between a motor inner end wall 73 and a motor outer end wall 74.
  • a motor shaft 65 is provided at the center of the motor housing 70.
  • the motor shaft 65 is provided at a position where the center line of the motor housing 70 passes.
  • the centerline of the motor housing 70 extends in the axial direction AD through the center of the motor housing 70.
  • the motor shaft 65 is rotatably fixed to the motor inner end wall 73 by a bearing or the like without passing through the motor inner end wall 73.
  • the motor outer circumferential fin 79 is provided on the motor outer circumferential wall surface 71a.
  • the motor outer circumferential fin 79 extends radially outward from the motor outer circumferential wall surface 71a.
  • the motor outer peripheral fin 79 is formed into a fin shape so as to extend in the axial direction AD as a whole.
  • the motor outer circumferential fin 79 is a heat radiation fin and radiates heat from the motor device 60 to the outside.
  • the motor outer circumferential fins 79 emit heat from the motor housing 70 to the outside air by exchanging heat with the outside air.
  • a plurality of motor outer peripheral fins 79 are arranged in the circumferential direction CD.
  • the motor outer peripheral fin 79 is included in the heat radiation mechanism of the EPU 50.
  • the inverter housing 90 is formed into a flat cylindrical shape as a whole.
  • inverter housing 90 is formed in a cylindrical shape.
  • the inverter housing 90 is made of a metal material or the like and has thermal conductivity.
  • the outer surface 90a of the inverter housing 90 has an inverter outer peripheral wall surface 91a, an inverter inner peripheral wall surface 92a, an inverter inner end wall surface 93a, and an inverter outer end wall surface 94a.
  • the inverter outer peripheral wall surface 91a is the outer peripheral surface of the inverter housing 90, and extends annularly in the circumferential direction CD.
  • the inverter inner circumferential wall surface 92a is an inner circumferential surface of the inverter housing 90, and extends annularly in the circumferential direction CD.
  • the inverter inner end wall surface 93a and the inverter outer end wall surface 94a are arranged in the axial direction AD.
  • the inverter outer peripheral wall surface 91a is in a state extending between an inverter inner end wall surface 93a and an inverter outer end wall surface 94a.
  • the inverter inner end wall surface 93a faces the motor device 60 side in the axial direction AD.
  • the inverter housing 90 has an inverter outer peripheral wall 91, an inverter inner peripheral wall 92, an inverter inner end wall 93, an inverter outer end wall 94, and an inverter outer peripheral fin 99.
  • the inverter outer peripheral wall 91 forms an inverter outer peripheral wall surface 91a.
  • the inverter inner peripheral wall 92 forms an inverter inner peripheral wall surface 92a.
  • the inverter inner end wall 93 forms an inverter inner end wall surface 93a.
  • the inverter outer end wall 94 forms an inverter outer end wall surface 94a.
  • the inverter inner end wall 93 and the inverter outer end wall 94 are arranged in the circumferential direction CD.
  • the inverter outer peripheral wall 91 spans an inverter inner end wall 93 and an inverter outer end wall 94.
  • the inverter housing 90 has an inverter through hole 95.
  • the inverter through hole 95 penetrates the inverter housing 90 in the axial direction AD.
  • an inverter inner peripheral wall surface 92a forms an inverter through hole 95.
  • the inverter inner peripheral wall surface 92a corresponds to the hole forming surface.
  • Inverter through hole 95 is provided in the center portion of inverter housing 90.
  • the inverter through hole 95 is provided at a position where the center line of the inverter housing 90 passes.
  • the centerline of inverter housing 90 extends through inverter housing 90 in the axial direction AD.
  • the inverter through hole 95 and the motor shaft 65 are arranged in the axial direction AD.
  • the inverter through hole 95 is provided at a position where the motor axis Cm passes.
  • the inverter through hole 95 has an inner end opening 95a and an outer end opening 95b.
  • the inner end opening 95a is the end of the inverter through hole 95 on the motor device 60 side.
  • the inner end opening 95a is an opening provided in the inverter inner end wall surface 93a.
  • the outer end opening 95b is the end of the inverter through hole 95 on the opposite side to the motor device 60.
  • the outer end opening 95b is an opening provided in the inverter outer end wall surface 94a.
  • a plurality of inverter outer peripheral fins 99 are provided on the inverter outer peripheral wall surface 91a.
  • the inverter outer peripheral fins 99 extend radially outward from the inverter outer peripheral wall surface 91a.
  • the inverter outer peripheral fin 99 is formed into a fin shape so as to extend in the axial direction AD as a whole.
  • the inverter outer peripheral fins 99 are heat radiation fins, and radiate heat from the inverter device 80 to the outside.
  • the inverter outer circumferential fins 99 perform heat exchange with the external air, thereby discharging the heat of the inverter housing 90 to the external air.
  • External air is fluid such as air outside the inverter device 80.
  • a plurality of inverter outer peripheral fins 99 are arranged in the circumferential direction CD.
  • the inverter outer circumferential fin 99 is included in the heat radiation mechanism of the EPU 50.
  • the motor outer peripheral wall 71 and the inverter outer peripheral wall 91 are arranged in the axial direction AD.
  • the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a are arranged in the axial direction AD.
  • the motor inner end wall 73 and the inverter inner end wall 93 are arranged in the axial direction AD so as to be overlapped with each other, but are located apart from each other in the axial direction AD.
  • the motor inner end wall surface 73a and the inverter inner end wall surface 93a face each other at positions separated from each other.
  • the EPU 50 has a housing gap 100.
  • Housing gap 100 is a gap between motor housing 70 and inverter housing 90.
  • Motor housing 70 and inverter housing 90 are arranged in the axial direction AD.
  • the motor inner end wall surface 73a and the inverter inner end wall surface 93a face each other with a housing gap 100 interposed therebetween.
  • the housing gap 100 is a gap between the motor inner end wall surface 73a and the inverter inner end wall surface 93a.
  • the motor inner end wall surface 73a corresponds to a motor facing surface
  • the inverter inner end wall surface 93a corresponds to an inverter facing surface.
  • the housing gap 100 extends in a direction perpendicular to the axial direction AD.
  • the housing gap 100 extends in the radial direction RD so as to span the motor axis Cm and at least one of the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a.
  • the housing gap 100 extends in the radial direction RD along the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a.
  • the housing gap 100 is open radially outward.
  • the housing gap 100 has a gap opening 100a.
  • the gap opening 100a is the radially outer end of the housing gap 100.
  • the gap opening 100a extends annularly in the circumferential direction CD.
  • the gap opening 100a extends in the circumferential direction CD along at least one of the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a.
  • the inverter through hole 95 communicates with the housing gap 100.
  • the inverter through hole 95 extends from the housing gap 100 in the axial direction AD.
  • Inverter through hole 95 opens housing gap 100 on the opposite side of motor housing 70 via inverter housing 90 .
  • the boundary between the inverter through hole 95 and the housing gap 100 includes an inner end opening 95a.
  • the EPU 50 has gap fins 105.
  • the gap fin 105 is provided on at least one of the motor inner end wall surface 73a and the inverter inner end wall surface 93a.
  • the gap fin 105 extends from one of the motor inner end wall surface 73a and the inverter inner end wall surface 93a toward the other.
  • the gap fins 105 protrude toward the housing gap 100.
  • the gap fin 105 is formed into a fin shape so as to extend in the radial direction RD as a whole.
  • the gap fins 105 are heat radiation fins, and radiate heat from the motor device 60 and the inverter device 80 to the housing gap 100.
  • the gap fins 105 emit heat from the housings 70 and 90 to the housing gap 100 by exchanging heat with the gas in the housing gap 100.
  • the gap fin 105 corresponds to a gap heat radiation section.
  • a plurality of gap fins 105 are arranged in the circumferential direction CD.
  • the gap fin 105 provided on the motor inner end wall surface 73a extends from the motor inner end wall surface 73a toward the inverter inner end wall surface 93a.
  • the gap fins 105 radiate heat from the motor housing 70 to the housing gap 100.
  • the surface area of the motor housing 70 is increased by the gap fin 105.
  • the gap fin 105 provided on the inverter inner end wall surface 93a extends from the inverter inner end wall surface 93a toward the motor inner end wall surface 73a.
  • the gap fins 105 radiate heat from the inverter housing 90 to the housing gap 100.
  • the surface area of the inverter housing 90 is increased by the gap fins 105.
  • FIGS. 3 and 4 illustrate a configuration in which the gap fins 105 are provided on the inverter inner end wall surface 93a.
  • the plurality of gap fins 105 include long gap fins 105a and short gap fins 105b.
  • the gap fins 105a and 105b extend in the radial direction RD so as to extend radially inward toward the motor axis Cm.
  • the gap fins 105a and 105b are provided in a direction in which a virtual extension line extending radially inward passes through the motor axis Cm.
  • the long gap fins 105a are longer in the radial direction RD than the short gap fins 105b.
  • the elongated gap fin 105a extends between the inverter outer peripheral wall surface 91a and the inverter inner peripheral wall surface 92a.
  • the short gap fins 105b are located away from both the inverter outer peripheral wall surface 91a and the inverter inner peripheral wall surface 92a in the radial direction RD.
  • the long gap fins 105a and the short gap fins 105b are arranged alternately in the circumferential direction CD, for example.
  • the long gap fins 105a and the short gap fins 105b correspond to a gap heat radiation section.
  • the EPU 50 has hole fins 96.
  • the hole fins 96 are provided on the inverter inner peripheral wall surface 92a.
  • the hole fins 96 extend radially inward from the inverter inner peripheral wall surface 92a.
  • the hole fins 96 protrude toward the inner peripheral side of the inverter through hole 95.
  • the hole fin 96 is formed in a fin shape so as to extend in the axial direction AD as a whole.
  • the hole fins 96 are heat radiation fins and radiate heat from the inverter device 80 to the inverter through-holes 95.
  • the hole fins 96 emit heat from the inverter housing 90 to the inverter through hole 95 by exchanging heat with the gas within the inverter through hole 95 .
  • the hole fins 96 correspond to hole heat radiation parts. For example, a plurality of hole fins 96 are arranged in the circumferential direction CD.
  • the plurality of hole fins 96 include shaft hole fins 96a.
  • the shaft hole fin 96a extends in the axial direction AD parallel to the motor axis Cm.
  • the shaft hole fin 96a is located away from both the inverter inner end wall surface 93a and the inverter outer end wall surface 94a.
  • the shaft hole fin 96a corresponds to a hole heat radiation section. Note that FIG. 5 is a planar development of a part of the inverter inner circumferential wall surface 92a viewed from the radially inner side.
  • the EPU 50 has a gap spacer 101.
  • Gap spacer 101 is a spacer for forming housing gap 100 between motor housing 70 and inverter housing 90.
  • the gap spacer 101 secures a housing gap 100 by being located between the motor inner end wall surface 73a and the inverter inner end wall surface 93a.
  • the gap spacer 101 is a spacer member separated from the motor housing 70 and the inverter housing 90.
  • the gap spacer 101 is made of a metal material or the like and has thermal conductivity.
  • the gap spacer 101 is also a connection part that connects the motor device 60 and the inverter device 80.
  • the gap spacer 101 is fixed to each of the motor housing 70 and the inverter housing 90 using fixtures such as bolts. In this way, the gap spacer 101 connects the motor housing 70 and the inverter housing 90 while ensuring the housing gap 100.
  • the gap spacer 101 is sometimes referred to as a connecting member.
  • the gap spacer 101 may be a part of at least one of the motor housing 70 and the inverter housing 90.
  • the protrusion of the motor housing 70 may be the gap spacer 101. This projection protrudes from the motor inner end wall surface 73a toward the inverter inner end wall surface 93a, and functions as a gap spacer 101 while in contact with the inverter inner end wall surface 93a. Further, this protrusion is fixed to the inverter housing 90, thereby connecting the motor housing 70 and the inverter housing 90.
  • the EPU 50 has a conductive bus bar 55.
  • the conductive bus bar 55 connects the motor 61 and the inverter 81 in a energized manner.
  • the conductive bus bar 55 is made of a metal material or the like and has electrical conductivity.
  • the conductive bus bar 55 corresponds to a conductive member.
  • a plurality of conductive bus bars 55 are provided in the EPU 50.
  • the conductive bus bar 55 electrically connects the motor 61 and the inverter 81 in each of a plurality of phases, for example.
  • the conductive bus bar 55 spans between the motor housing 70 and the inverter housing 90 via the housing gap 100.
  • the gap spacer 101 protects the conductive bus bar 55. Gap spacer 101 covers conductive bus bar 55 so that conductive bus bar 55 is not exposed to housing gap 100. For example, the conductive bus bar 55 extends between the motor housing 70 and the inverter housing 90, passing through the gap spacer 101 in the axial direction AD. Note that the electrical insulation of the conductive bus bar 55 in the gap spacer 101 is ensured by the insulating coating that the conductive bus bar 55 has. Furthermore, the gap spacer 101 may have electrical insulation in addition to thermal conductivity. Further, one gap spacer 101 may protect one conductive bus bar 55 or a plurality of conductive bus bars 55.
  • a plurality of sets of conductive bus bars 55 and gap spacers 101 are provided in the housing gap 100. Heat from the conductive bus bar 55 is released into the housing gap 100 via the gap spacer 101. Gap spacer 101 can release heat from motor housing 70 and inverter housing 90 into housing gap 100 in addition to heat from conductive bus bar 55 . The gap spacer 101 protrudes toward the housing gap 100 from the motor inner end wall surface 73a and the inverter inner end wall surface 93a. The gap spacer 101 corresponds to a gap heat radiation section.
  • the airflows Fa1 and Fa2 flow in the axial direction AD along the motor outer peripheral wall surface 71a and the motor outer peripheral fins 79.
  • the motor housing 70 heat is released from the motor outer peripheral wall surface 71a and the motor outer peripheral fins 79 to the airflows Fa1 and Fa2.
  • the outer circumferential airflow Fa1 flows across the housing gap 100 in the axial direction AD, and then flows in the axial direction AD along the inverter outer circumferential wall surface 91a and the inverter outer circumferential fins 99.
  • the inverter housing 90 heat is released from the inverter outer peripheral wall surface 91a and the inverter outer peripheral fins 99 to the outer peripheral airflow Fa1.
  • the gap airflow Fa2 flows into the housing gap 100 from the gap opening 100a.
  • the gap airflow Fa2 flows in the radial direction RD along the motor inner end wall surface 73a, the inverter inner end wall surface 93a, and the gap fins 105.
  • heat is released from the motor inner end wall surface 73a, the inverter inner end wall surface 93a, and the gap fins 105 to the gap airflow Fa2.
  • heat is released from the conductive bus bar 55 and the like to the gap airflow Fa2 via the gap spacer 101.
  • heat radiation from the motor housing 70 and the inverter housing 90 is promoted by the gap fins 105 and the gap spacer 101.
  • the gap fins 105 and the gap spacer 101 are included in a heat radiation promotion mechanism that promotes heat radiation in the housing gap 100.
  • the gap airflow Fa2 flows from the housing gap 100 into the inverter through hole 95 via the inner end opening 95a.
  • the gap airflow Fa2 flows in the axial direction AD along the inverter inner peripheral wall surface 92a and the hole fins 96. Thereafter, the gap airflow Fa2 flows out of the inverter housing 90 from the inverter through hole 95 through the outer end opening 95b.
  • heat is released from the inverter inner peripheral wall surface 92a and the hole fins 96 to the gap airflow Fa2. In this way, heat radiation from the inverter housing 90 is promoted by the hole fins 96 in the inverter through hole 95 .
  • a housing gap 100 that is open radially outward is provided between the motor housing 70 and the inverter housing 90.
  • a configuration is assumed in which the housing gap 100 does not exist between the motor housing 70 and the inverter housing 90.
  • This configuration includes a configuration in which the motor inner end wall surface 73a and the inverter inner end wall surface 93a are made common or are in contact with each other. With this configuration, the motor housing 70 and the inverter housing 90 easily transfer heat to each other via the contact portion. Thereby, there is a concern that heat may accumulate in the boundary between the motor housing 70 and the inverter housing 90. In contrast, in this embodiment, the housing gap 100 prevents the motor housing 70 and the inverter housing 90 from transmitting heat to each other.
  • the propulsion device 15 has a common housing in which the motor housing 70 and the inverter housing 90 are shared. With this configuration, there is a concern that heat may accumulate between the motor 61 and the inverter 81 inside the common housing. In contrast, in this embodiment, the heat existing between the motor 61 and the inverter 81 is easily released to the outside via the housing gap 100.
  • the housing gap 100 extends in the radial direction RD so as to span the motor axis Cm, the motor outer peripheral wall surface 71a, and the inverter outer peripheral wall surface 91a.
  • the housing gap 100 reaches the center portion of the motor housing 70 and the inverter housing 90 in the radial direction RD. Therefore, heat in the center portion of the motor inner end wall 73 and the center portion of the inverter inner end wall 93 is easily released to the outside of the EPU 50 through the housing gap 100. Therefore, heat can be prevented from accumulating in the central portions of the motor inner end wall 73 and the inverter inner end wall 93.
  • the housing gap 100 is provided at a position radially outward from the motor axis Cm.
  • the housing gap 100 does not reach the center portion of the housings 70, 90 in the radial direction RD. For this reason, it is not possible to impart scavenging properties to the vicinity of the center in the radial direction RD of the boundary portion between the motor housing 70 and the inverter housing 90. Therefore, there is a concern that heat may accumulate near the center of the boundary between the housings 70 and 90.
  • the air scavenging performance near the center of the boundary between the housings 70 and 90 can be improved by the housing gap 100. Therefore, it is possible to prevent heat from accumulating near the center of the boundary between the housings 70 and 90.
  • the gap fins 105 and the gap spacer 101 are provided on at least one of the inner end wall surfaces 73a and 93a.
  • heat radiation from the motor inner end wall 73 and the inverter inner end wall 93 to the housing gap 100 is promoted by the gap fins 105 and the gap spacer 101. Therefore, the heat dissipation effect from the boundary between the motor housing 70 and the inverter housing 90 to the housing gap 100 can be enhanced by the gap fins 105 and the gap spacer 101.
  • the heat dissipation ability from the housings 70, 90 to the housing gap 100 is easily improved compared to, for example, a configuration without the gap fins 105.
  • there is a gap spacer 101 in the housing gap 100 Therefore, compared to, for example, a configuration without the gap spacer 101, the heat dissipation ability from the housings 70, 90 to the housing gap 100 is easily improved.
  • the inverter through hole 95 opens the housing gap 100 on the opposite side of the motor housing 70 via the inverter housing 90.
  • gas easily passes through the housing gap 100 because the housing gap 100 is open in both the radial direction RD and the axial direction AD.
  • the gap airflow Fa2 flowing in the radial direction RD from the gap opening 100a tends to flow out in the axial direction AD from the outer end opening 95b.
  • the heat imparted to the gap airflow Fa2 in the housing gap 100 tends to increase. Therefore, the heat dissipation effect of the housing gap 100 can be enhanced by the inverter through hole 95.
  • an inverter through hole 95 is provided in the center portion of the inverter housing 90 in the radial direction RD.
  • hole fins 96 are provided on the inverter inner circumferential wall surface 92a.
  • heat radiation from the inverter inner peripheral wall surface 92a to the inverter through hole 95 is promoted by the hole fins 96. Therefore, the hole fins 96 can enhance the heat dissipation effect from the central portion of the inverter housing 90 to the inverter through hole 95 in both the axial direction AD and the radial direction RD.
  • the gap spacer 101 forms the housing gap 100 and protects the conductive bus bar 55.
  • the gap spacer 101 can prevent abnormalities of the conductive bus bar 55 from occurring in the housing gap 100. Therefore, the gap spacer 101 can prevent the safety of the conductive bus bar 55 from decreasing due to the housing gap 100 between the motor housing 70 and the inverter housing 90.
  • the gap spacer 101 since the gap spacer 101 has thermal conductivity, the heat of the conductive bus bar 55 is released from the gap spacer 101 to the housing gap 100. In the housing gap 100, a gap spacer 101 is surrounded by gas. Therefore, the heat dissipation of the conductive bus bar 55 can be easily improved by the housing gap 100 and the gap spacer 101. Further, since the conductive bus bar 55, which is also a heat generation source, is passed through the gap spacer 101, heat exchange between the conductive bus bar 55 and the motor 61 and the inverter 81 can be suppressed.
  • the plurality of gap fins 105 include fins different from the long gap fins 105a and short gap fins 105b of the first embodiment. Configurations, operations, and effects that are not particularly described in the second embodiment are the same as those in the first embodiment. The second embodiment will be explained mainly on points different from the first embodiment.
  • the plurality of gap fins 105 include an inclined gap fin 105c as a fin different from the gap fins 105a and 105b.
  • the inclined gap fins 105c extend in the radial direction RD as a whole, they are inclined in the circumferential direction CD with respect to an imaginary line extending in the radial direction RD through the motor axis Cm.
  • the inclined gap fins 105c extend in a direction in which a virtual extension of the inclined gap fins 105c extending radially inward does not pass through the motor axis Cm.
  • the radially outer end and the radially inner end are not lined up in the radial direction RD but are shifted in the circumferential direction CD.
  • the inclined gap fin 105c is located away from both the inverter outer peripheral wall surface 91a and the inverter inner peripheral wall surface 92a in the radial direction RD.
  • a plurality of inclined gap fins 105c are arranged in the circumferential direction CD.
  • the inclined gap fins 105c correspond to a gap heat dissipation section.
  • the gap airflow Fa2 flows along the plurality of inclined gap fins 105c.
  • the gap airflow Fa2 flows radially inward toward the inner end opening 95a while turning in the circumferential direction CD along the inclined gap fins 105c. Then, the gap airflow Fa2 flows into the inner end opening 95a while swirling so as to generate a vortex.
  • the gap airflow Fa2 easily flows into the inverter through hole 95 from the housing gap 100 by swirling. Therefore, the flow rate of the gap airflow Fa2 flowing into the housing gap 100 and the inverter through hole 95 can be increased. In this way, more heat is likely to be released from the housings 70, 90 into the gap airflow Fa2 in the housing gap 100 due to the inclined gap fins 105c.
  • rotation of the propeller 20 may generate a swirling flow.
  • the swirling flow is an airflow that flows in the axial direction AD around the outer circumferential side of the motor unit 59 while swirling in the circumferential direction CD.
  • the gap air flow Fa2 is a swirling flow
  • the inclined gap fins 105c are inclined in a direction that facilitates the flow of the swirling flow.
  • the plurality of hole fins 96 include inclined hole fins 96b as fins different from the shaft hole fins 96a.
  • the inclined hole fin 96b extends in the axial direction AD as a whole, and is inclined in the circumferential direction CD with respect to the motor axis Cm.
  • the end portion on the inverter inner end wall surface 93a side and the end portion on the inverter outer end wall surface 94a side are not lined up in the axial direction AD but are shifted in the circumferential direction CD.
  • a plurality of inclined hole fins 96b are arranged in both the circumferential direction CD and the axial direction AD.
  • the slanted hole fins 96b correspond to hole heat radiation parts.
  • the gap airflow Fa2 flows along the plurality of inclined hole fins 96b.
  • the gap airflow Fa2 flows in the axial direction AD toward the outer end opening 95b while turning in the circumferential direction CD along the inclined hole fins 96b, thereby making it easier to flow through the inverter through hole 95. In this way, more heat is likely to be released from the inverter housing 90 to the gap airflow Fa2 in the inverter through hole 95 due to the inclined hole fins 96b.
  • the plurality of gap fins 105 may include at least one of the long gap fins 105a and the short gap fins 105b in addition to the inclined gap fins 105c.
  • the plurality of hole fins 96 may include shaft hole fins 96a in addition to the inclined hole fins 96b.
  • the gap spacer 101 protects the conductive bus bar 55.
  • the plurality of gap fins 105 include fins that protect the conductive bus bar 55. Configurations, operations, and effects that are not particularly described in the third embodiment are the same as those in the first embodiment. The third embodiment will be mainly described with respect to the points that are different from the first embodiment.
  • the plurality of gap fins 105 include a protective gap fin 105d.
  • the protective gap fin 105d protects the conductive bus bar 55.
  • the protective gap fin 105d covers the conductive bus bar 55 so that the conductive bus bar 55 is not exposed to the housing gap 100.
  • the conductive bus bar 55 extends between the motor housing 70 and the inverter housing 90, passing through the protective gap fin 105d in the axial direction AD.
  • the protective gap fin 105d corresponds to a gap heat dissipation section. Note that the protective gap fin 105d may have electrical insulation in addition to thermal conductivity.
  • a plurality of sets of conductive bus bars 55 and protective gap fins 105d are provided in the housing gap 100. Heat from the conductive bus bar 55 is released into the housing gap 100 via the protective gap fin 105d. Note that one protection gap fin 105d may protect one conductive bus bar 55, or may protect a plurality of conductive bus bars 55.
  • the protective gap fin 105d protects the conductive bus bar 55 by extending over the motor inner end wall surface 73a and the inverter inner end wall surface 93a.
  • the protective gap fin 105d has a function as a spacer. That is, the protective gap fin 105d forms a housing gap 100 between the motor housing 70 and the inverter housing 90.
  • the protective gap fin 105d forms the housing gap 100 and protects the conductive bus bar 55.
  • the protective gap fins 105d can prevent abnormalities from occurring in the conductive bus bar 55 in the housing gap 100. Therefore, the protective gap fins 105d can prevent the safety of the conductive bus bar 55 from decreasing due to the housing gap 100 between the motor housing 70 and the inverter housing 90.
  • the protective gap fins 105d have thermal conductivity, the heat of the conductive bus bar 55 is released from the protective gap fins 105d to the housing gap 100.
  • the protective gap fin 105d is surrounded by gas. Therefore, the heat dissipation of the conductive bus bar 55 is easily improved by the housing gap 100 and the protective gap fin 105d.
  • the conductive bus bar 55 which is also a heat generation source, is passed through the protective gap fin 105d, heat exchange between the conductive bus bar 55 and the motor 61 and the inverter 81 can be suppressed.
  • the gap opening 100a extends annularly in the circumferential direction CD.
  • a plurality of gap openings 100a are arranged in the circumferential direction CD. Configurations, operations, and effects that are not particularly described in the fourth embodiment are the same as those in the first embodiment. The fourth embodiment will be explained mainly on points different from the first embodiment.
  • the EPU 50 has a partition outer peripheral wall 111.
  • the partition outer peripheral wall 111 is provided between the motor outer peripheral wall 71 and the inverter outer peripheral wall 91 in the axial direction AD.
  • the partition outer peripheral wall 111 extends annularly in the circumferential direction CD.
  • the partition outer peripheral walls 111 are arranged in the housing gap 100 in the radial direction RD.
  • the partition outer peripheral wall 111 partitions the housing gap 100 from the outside in the radial direction RD.
  • the partition outer peripheral wall 111 forms a housing gap 100 between the motor housing 70 and the inverter housing 90.
  • the partition outer peripheral wall 111 has a function as a spacer.
  • Partition outer peripheral wall 111 may be a part of motor housing 70 or inverter housing 90, or may be a member independent from housings 70, 90.
  • the EPU 50 has a partition ventilation hole 112.
  • the partition ventilation hole 112 penetrates the partition outer peripheral wall 111 in the radial direction RD.
  • the partition ventilation hole 112 communicates with the housing gap 100 and opens the housing gap 100 radially outward.
  • a plurality of partition ventilation holes 112 are arranged in the circumferential direction CD.
  • the partition vent hole 112 extends in the radial direction RD as a whole, it is inclined in the circumferential direction CD with respect to an imaginary line extending in the radial direction through the motor axis Cm.
  • the partition ventilation hole 112 extends in a direction in which a virtual extension of the partition ventilation hole 112 radially inward does not pass through the motor axis Cm.
  • the partition vent 112 has an outer partition opening 112a and an inner partition opening 112b.
  • the partition outer circumferential opening 112a is the outer circumferential end of the partition ventilation hole 112.
  • the partition outer peripheral opening 112a is provided on the partition outer surface 111a.
  • the partition outer surface 111a is the outer peripheral surface of the partition outer peripheral wall 111.
  • the partition inner peripheral opening 112b is the inner peripheral end of the partition ventilation hole 112.
  • the partition inner peripheral opening 112b is provided on the partition inner surface 111b.
  • the partition inner surface 111b is the inner peripheral surface of the partition outer surface 111a.
  • the partition outer peripheral opening 112a and the partition inner peripheral opening 112b are located at positions shifted in the circumferential direction CD.
  • the partition outer circumferential opening 112a and the partition inner circumferential opening 112b only need to be at least partially shifted in the circumferential direction CD.
  • the partition vent hole 112 is included in the housing gap 100.
  • the partition outer peripheral opening 112a serves as a gap opening 100a.
  • a plurality of gap openings 100a are arranged in the circumferential direction CD.
  • the gap airflow Fa2 flows along the partition ventilation hole 112. After flowing into the gap opening 100a, the gap airflow Fa2 passes through the partition inner peripheral opening 112b and flows radially inward while turning in the circumferential direction CD along the partition ventilation hole 112. Therefore, in the housing gap 100, the gap airflow Fa2 that has passed through the partition ventilation hole 112 tends to swirl so as to generate a vortex.
  • external air is introduced into the housing gap 100 from the partition vent 112 as fresh air.
  • the partition ventilation hole 112 which is a new intake port, it becomes easier to create air flow in the housing gap 100. That is, the partition air hole 112 guides the gap airflow Fa2 so that the gap airflow Fa2 flows in the circumferential direction CD, thereby smoothing the flow of the gap airflow Fa2.
  • the gap airflow Fa2 flows smoothly in each of the housing gap 100 and the inverter through hole 95. Thereby, external air can be efficiently drawn into the housing gap 100 from the partition ventilation hole 112.
  • the gap airflow Fa2 can also be rectified by the gap fins 105 of the second embodiment.
  • the illustration of the gap fin 105 is omitted in FIGS. 9 and 10, the housing gap 100 is provided with a combination of the partition vent 112 and the gap fin 105.
  • the EPU 50 has an outer circumferential guide portion 115.
  • the outer circumferential guide portion 115 guides external air into the housing gap 100.
  • the outer circumferential guide portion 115 is included in the inverter housing 90.
  • the outer circumference guide portion 115 extends radially outward from the inverter inner end wall 93.
  • the outer circumferential guiding portion 115 protrudes radially outward from the motor outer circumferential wall surface 71a. That is, the outer circumferential guide portion 115 protrudes radially outward from the gap opening 100a.
  • a plurality of outer circumferential guide portions 115 are arranged in the circumferential direction CD.
  • the outer circumferential guide portion 115 is made of a metal material or the like and has thermal conductivity.
  • the outer circumferential guide section 115 corresponds to a gas guide section.
  • the outer circumferential guide portion 115 is included in a fluid guide mechanism that guides fluid into the housing gap 100.
  • the outer circumferential guide portion 115 has a radial extending portion 115a and an axially extending portion 115b.
  • the radially extending portion 115a extends radially outward from the inverter outer peripheral wall surface 91a.
  • the radially extending portion 115a is inclined with respect to the inverter inner end wall surface 93a so as to extend upstream toward the motor device 60 in the axial direction AD.
  • the shaft extension portion 115b extends in the axial direction AD from the radial extension portion 115a toward the motor device 60 side.
  • the shaft extension 115b extends upstream from the tip of the radial extension 115a.
  • the gap airflow Fa2 flowing along the motor outer peripheral wall surface 71a reaches the outer peripheral guide portion 115.
  • the gap airflow Fa2 is guided to the housing gap 100 by flowing along the outer circumferential guide portion 115.
  • the shaft extending portion 115b restricts the gap airflow Fa2 that has reached the radial extending portion 115a from flowing outward in the radial direction.
  • the gap airflow Fa2 guided by the outer periphery guide portion 115 flows into the housing gap 100 from the gap opening 100a.
  • the outer circumferential guide portion 115 guides gas such as the gap airflow Fa2 so that it flows into the housing gap 100 from the gap opening 100a.
  • the gap airflow Fa2 passing through the housing gap 100 is likely to increase due to the guidance of the outer circumferential guide portion 115. Therefore, in the housing gap 100, more heat is likely to be released from the motor housing 70 and the inverter housing 90 into the gap airflow Fa2. Therefore, the heat dissipation effect of the housing gap 100 can be enhanced by the outer circumferential guide portion 115.
  • the outer circumferential guide portion 115 may extend annularly in the circumferential direction CD.
  • both the radial extending portion 115a and the axially extending portion 115b may extend annularly in the circumferential direction CD.
  • the outer circumferential guide portion 115 guides external air into the housing gap 100 as the gap airflow Fa2 throughout the circumferential direction CD. Therefore, the heat dissipation effect of the housing gap 100 can be enhanced throughout the circumferential direction CD.
  • the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a are arranged in the axial direction AD.
  • the inverter outer circumferential wall surface 91a is provided at a position radially outwardly away from the motor outer circumferential wall surface 71a. Configurations, operations, and effects that are not particularly described in the sixth embodiment are the same as those in the first embodiment. The sixth embodiment will be described with a focus on points that are different from the first embodiment.
  • the outer diameter of the inverter housing 90 as a whole is larger than the outer diameter of the motor housing 70.
  • the inverter outer peripheral wall 91 is provided radially outward than the motor outer peripheral wall 71. Accordingly, the inverter outer circumferential wall surface 91a is located on the radially outer side than the motor outer circumferential wall surface 71a.
  • the inverter inner end wall surface 93a extends radially outward than the motor inner end wall surface 73a.
  • the inverter inner end wall surface 93a protrudes radially outward from the housing gap 100.
  • the inner end guiding surface 93b guides gas such as the gap airflow Fa2 so that it flows into the housing gap 100 from the gap opening 100a.
  • the gap airflow Fa2 passing through the housing gap 100 tends to increase due to the guidance of the inner end guide surface 93b. Therefore, the heat dissipation effect of the housing gap 100 can be enhanced by the inner end guide surface 93b.
  • a plurality of inner end guide surfaces 93b may be arranged in the circumferential direction CD.
  • the inverter housing 90 may have a shape in which a plurality of protruding portions are arranged radially outward than the motor housing 70 in the circumferential direction CD.
  • the inner end guide surface 93b may extend in the radial direction RD so as to be inclined with respect to the motor inner end wall surface 73a.
  • the inner end guide surface 93b may be inclined in the radial direction RD so as to extend toward the motor device 60 side.
  • an outer peripheral flow path is provided on the outer peripheral side of the motor unit 59.
  • Configurations, operations, and effects that are not particularly described in the seventh embodiment are the same as those in the first embodiment.
  • the seventh embodiment will be described with a focus on points that are different from the first embodiment.
  • the EPU 50 has an outer duct 120.
  • the outer duct 120 houses the motor unit 59.
  • the outer duct 120 accommodates at least a motor device 60 and an inverter device 80 of the motor unit 59.
  • the outer circumferential duct 120 is formed into a cylindrical shape as a whole, and extends in the axial direction AD along the motor axis Cm.
  • the outer duct 120 extends over the motor housing 70 and the inverter housing 90 in the axial direction AD.
  • the outer circumferential duct 120 covers the motor outer circumferential wall 71 and the inverter outer circumferential wall 91 from the outer circumferential side.
  • the outer circumferential duct 120 is located at a position radially outwardly away from the motor outer circumferential wall surface 71a and the inverter outer circumferential wall surface 91a.
  • the outer duct 120 is made of a resin material or the like, and is elastically deformable.
  • the outer duct 120 is fixed to the motor unit 59 using, for example, the restoring force of the outer duct 120.
  • the outer duct 120 may be fixed to the motor unit 59 using a fixing device such as a bolt.
  • the outer duct 120 may have thermal conductivity.
  • the EPU 50 has a duct flow path 130.
  • the duct flow path 130 is a space between the motor unit 59 and the outer duct 120.
  • the duct flow path 130 spans the motor housing 70 and the inverter housing 90 in the axial direction AD.
  • the duct flow path 130 extends along the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a.
  • the duct flow path 130 as a whole extends annularly in the circumferential direction CD.
  • the duct flow path 130 accommodates outer circumferential fins 79 and 99 (not shown in FIG. 14).
  • the outer peripheral duct 120 is provided on the downstream side of the propeller 20 together with the duct flow path 130.
  • the outer duct 120 has an upstream duct opening 121, a downstream duct opening 122, and a duct ventilation hole 123.
  • the duct upstream opening 121 is an opening on the upstream side of the outer circumferential duct 120.
  • the duct upstream opening 121 opens the duct flow path 130 to the upstream side toward the propeller 20.
  • the duct downstream opening 122 is an opening on the downstream side of the outer circumferential duct 120.
  • the duct downstream port 122 opens the duct flow path 130 to the downstream side opposite to the propeller 20.
  • the duct ventilation hole 123 is provided between the duct upstream opening 121 and the duct downstream opening 122 in the axial direction AD.
  • the duct ventilation hole 123 opens a duct flow path 130 between the duct upstream opening 121 and the duct downstream opening 122.
  • the duct ventilation hole 123 opens a duct flow path 130 in at least one of the radial direction RD and the axial direction AD.
  • the duct ventilation hole 123 opens the duct flow path 130 toward both the outside in the radial direction RD and the upstream side in the axial direction AD.
  • the duct ventilation hole 123 penetrates the outer circumferential duct 120 in at least one of the radial direction RD and the axial direction AD.
  • the duct ventilation hole 123 penetrates the outer circumferential duct 120 in both the radial direction RD and the axial direction AD.
  • the duct ventilation hole 123 may open the duct flow path 130 in the circumferential direction CD. That is, the duct ventilation hole 123 may open the duct flow path 130 in at least one direction of the radial direction RD, the axial direction AD, and the circumferential direction CD. Moreover, the duct ventilation hole 123 may penetrate the outer circumferential duct 120 in the circumferential direction CD. That is, the duct ventilation hole 123 may penetrate the outer circumferential duct 120 in at least one direction of the radial direction RD, the axial direction AD, and the circumferential direction CD.
  • the duct ventilation hole 123 extends in the circumferential direction CD in the outer duct 120.
  • the duct ventilation hole 123 extends continuously or intermittently throughout the circumferential direction CD.
  • the duct ventilation hole 123 extends annularly in the circumferential direction CD, thereby continuously extending in the circumferential direction CD.
  • the duct ventilation holes 123 are arranged in plurality in the circumferential direction CD, and thus extend intermittently in the circumferential direction CD.
  • the outer duct 120 has an upstream duct 125 and a downstream duct 126.
  • the upstream duct 125 and the downstream duct 126 are arranged in the axial direction AD.
  • the upstream duct 125 forms a duct upstream opening 121 and extends from the duct upstream opening 121 toward the duct downstream opening 122.
  • the upstream duct 125 covers at least a portion of the motor housing 70 from the outer peripheral side.
  • the downstream duct 126 forms a duct downstream opening 122 and extends from the duct downstream opening 122 toward the duct upstream opening 121.
  • the downstream duct 126 covers at least a portion of the inverter housing 90 from the outer peripheral side.
  • the duct ventilation hole 123 is provided at the boundary between the upstream duct 125 and the downstream duct 126.
  • a stepped portion is formed at the boundary between the upstream duct 125 and the downstream duct 126.
  • the duct ventilation hole 123 is provided, for example, at this step portion, and the step portion is formed by the downstream duct 126 being located on the outside in the radial direction than the upstream duct 125.
  • the duct flow path 130 communicates with the housing gap 100.
  • the housing gap 100 extends radially inward from the duct flow path 130.
  • At least a portion of the duct ventilation hole 123 is provided upstream of the housing gap 100.
  • the duct ventilation hole 123 may be located at a position straddling the motor inner end wall surface 73a in the axial direction AD, or may be located at a position away from the motor inner end wall surface 73a on the upstream side.
  • the outer duct 120 extends downstream of the inverter housing 90 in the axial direction AD.
  • a downstream duct 126 extends downstream of the inverter housing 90.
  • the duct flow path 130 is also provided on the downstream side of the inverter housing 90 and communicates with the inverter through hole 95 .
  • the inverter through hole 95 extends from the duct flow path 130 to the upstream side in the axial direction AD.
  • the outer end opening 95b opens the inverter through hole 95 to the side opposite to the housing gap 100 in the axial direction AD.
  • the outer end opening 95b corresponds to the opposite opening.
  • the downstream duct 126 has a downstream base portion 126a and a downstream extension portion 126b.
  • the downstream base portion 126a and the downstream extension portion 126b are arranged in the axial direction AD.
  • the downstream base portion 126a is a portion of the downstream duct 126 that extends downward from the duct ventilation hole 123.
  • the downstream base portion 126a covers at least a portion of the inverter housing 90 from the outer peripheral side.
  • the downstream extension portion 126b extends downstream from the downstream base portion 126a.
  • the downstream extending portion 126b is located on the downstream side of the inverter housing 90 in the axial direction AD.
  • the boundary between the downstream base portion 126a and the downstream extension portion 126b is located on the inverter outer end wall surface 94a in the radial direction RD.
  • the downstream extension portion 126b forms a duct flow path 130 on the downstream side of the inverter housing 90.
  • the EPU 50 has a blower device 140.
  • the blower device 140 is a device for flowing gas to the outer circumferential side of the motor unit 59. When the blower device 140 blows air, gas flows into the duct flow path 130.
  • the blower device 140 uses the drive of the motor 61 to flow gas into the duct flow path 130 .
  • the gas flowing through the duct flow path 130 includes gas flowing due to the air blown by the blower 140 and gas flowing due to the rotation of the propeller 20.
  • the air blower 140 generates cooling air for cooling the EPU 50.
  • the blower device 140 has a downstream fan 141 and a fan shaft 142.
  • the downstream fan 141 is a fan that can blow air.
  • Downstream fan 141 is provided downstream of inverter housing 90 .
  • the downstream fans 141 are arranged in the inverter housing 90 in the axial direction AD.
  • the downstream fan 141 is provided at a position away from the inverter through hole 95 on the downstream side.
  • the downstream fan 141 rotates, for example, around the motor axis Cm.
  • the downstream fan 141 is an axial fan and blows air in the axial direction AD.
  • the downstream fan 141 is housed in the duct flow path 130.
  • the downstream fan 141 is covered from the outer peripheral side by the downstream extension portion 126b.
  • the fan shaft 142 connects the motor shaft 65 and the downstream fan 141.
  • the fan shaft 142 extends in the axial direction AD from the motor shaft 65 toward the downstream fan 141.
  • the fan shaft 142 is inserted into the inverter through hole 95 in the axial direction AD.
  • the fan shaft 142 rotates the downstream fan 141 together with the motor shaft 65 as the motor 61 is driven.
  • the connection portion between the fan shaft 142 and the motor shaft 65 may be housed in the motor housing 70 or may be provided in the housing gap 100.
  • the fan shaft 142 is lighter than the motor shaft 65.
  • the weight of fan shaft 142 is lighter than the weight of motor shaft 65.
  • Fan shaft 142 is thinner than motor shaft 65.
  • the outer diameter of fan shaft 142 is smaller than the outer diameter of motor shaft 65.
  • Configurations for making the fan shaft 142 lighter than the motor shaft 65 include different materials, different shapes, etc.
  • the difference in material is that the material forming the fan shaft 142 is lighter than the material forming the motor shaft 65.
  • the fan shaft 142 is made of a resin material while the motor shaft 65 is made of a metal material.
  • the difference in shape is that the motor shaft 65 is a solid columnar member, whereas the fan shaft 142 is a hollow cylindrical member.
  • the fan shaft 142 is a member manufactured independently from the motor shaft 65. Thereby, the degree of freedom in designing the material, shape, etc. of the fan shaft 142 can be increased with respect to the motor shaft 65.
  • the downstream fan 141 blows air toward the downstream side as the motor 61 is driven.
  • the downstream fan 141 blows air
  • the gas in the duct flow path 130 is blown out from the duct downstream opening 122 to the downstream side.
  • the pressure in the duct flow path 130 tends to be negative compared to the outside of the peripheral duct 120.
  • the pressure in the duct flow path 130 becomes negative, external air easily flows into the duct flow path 130 from the duct upstream opening 121 and the duct ventilation hole 123.
  • the inverter through hole 95 gas is sucked out from the inverter through hole 95 as the downstream fan 141 blows air, and the inverter through hole 95 tends to become under negative pressure.
  • the negative pressure is transmitted to the housing gap 100, so that the gas in the duct flow path 130 is easily sucked into the gap opening 100a. That is, the gas in the duct flow path 130 is likely to be guided into the housing gap 100 by the air blowing from the downstream fan 141 .
  • Downstream fan 141 is included in the fluid guiding mechanism and is sometimes referred to as a negative pressure fan.
  • This airflow flows through the duct flow path 130 as the downstream fan 141 rotates.
  • This airflow includes a first outer circumference airflow Fb1, a second outer circumference airflow Fb2, and a gap airflow Fb3.
  • the first outer circumferential airflow Fb1 flows into the duct flow path 130 from the duct upstream opening 121, and flows in the axial direction AD along the outer circumferential wall surfaces 71a, 91a and the outer circumferential fins 79, 99.
  • the first outer circumferential airflow Fb1 is released from the duct downstream opening 122 together with the heat imparted from the outer circumferential wall surfaces 71a, 91a and the outer circumferential fins 79, 99.
  • the second outer circumferential airflow Fb2 flows into the duct passage 130 from the duct ventilation hole 123 and flows in the axial direction AD along the inverter outer circumferential wall surface 91a and the inverter outer circumferential fins 99.
  • the second outer circumferential airflow Fb2 is released from the duct downstream port 122 together with the heat imparted from the inverter outer circumferential wall surface 91a and the inverter outer circumferential fins 99.
  • the gap airflow Fb3 flows into the duct flow path 130 from the duct upstream opening 121 or the duct ventilation hole 123 and reaches the housing gap 100.
  • the gap airflow Fb3 reaches the duct downstream opening 122 through the housing gap 100 and the inverter through hole 95, similarly to the gap airflow Fa2 of the first embodiment.
  • the gap airflow Fb3 is released from the duct downstream opening 122 together with the heat applied in the housing gap 100 and the inverter through hole 95.
  • the gap air flow Fb3 flows from the housing gap 100, through the inverter through hole 95, and from the outer end opening 95b into the duct flow path 130.
  • the downstream fan 141 blows air so that the gas flows from the housing gap 100, through the inverter through hole 95, and out of the outer end opening 95b. Therefore, in a configuration in which the inverter through hole 95 communicates with the housing gap 100, a large amount of gas tends to pass through the housing gap 100 and the inverter through hole 95. Therefore, the heat dissipation effect of the housing gap 100 and the inverter through hole 95 can be enhanced by the downstream fan 141.
  • the downstream fan 141 is connected to the motor shaft 65 and blows air as the motor 61 is driven.
  • the downstream fan 141 can blow air using the drive of the motor 61. Therefore, the EPU 50 can be made lighter than, for example, a configuration in which the EPU 50 is provided with a dedicated power source for driving the downstream fan 141. Furthermore, since the EPU 50 tends to generate heat when the motor 61 is driven, the EPU 50 can be air-cooled by the downstream fan 141 in accordance with the heat generated by the motor 61.
  • the downstream fan 141 is provided downstream of the housing gap 100.
  • the housing gap 100 tends to become negative pressure as the downstream fan 141 blows air. Therefore, the downstream fan 141 tends to suck out gas from the housing gap 100.
  • the downstream fan 141 functions as a negative pressure fan in this manner, pressure loss is less likely to occur in the housing gap 100, compared to, for example, a configuration in which the downstream fan 141 functions as a pressurized fan. Therefore, the amount of gas passing through the housing gap 100 increases, and the heat dissipation effect in the housing gap 100 tends to improve.
  • the downstream fan 141 is provided on the opposite side of the propeller 20 with the housing gap 100 interposed therebetween. With this configuration, there is no need to arrange downstream fan 141 between motor 61 and propeller 20. Therefore, there is no need to provide the propeller 20 or gear 53 for generating thrust on the fan shaft 142 that connects the motor shaft 65 and the downstream fan 141. In this way, since the fan shaft 142 only needs to be able to rotatably support the downstream fan 141, the weight of the fan shaft 142 can be reduced. Therefore, the weight of the EPU 50 can be reduced by changing the position of the downstream fan 141.
  • a configuration in which the blower fan is provided upstream of the housing gap 100 is assumed. That is, assume a configuration in which the blower fan is a pressurized fan. In this configuration, it is necessary to provide a blower fan on at least one of the motor shaft 65 and the EPU shaft 51. In other words, it is necessary to provide the propeller 20 and the gear 53 on the blower shaft that connects the motor shaft 65 and the blower fan. In this case, it is necessary to ensure the rigidity of the blower shaft to be able to support the weight of the propeller 20 and the gear 53. If the rigidity of the blower shaft is increased in this way, the blower shaft becomes heavier and the weight of the EPU 50 tends to increase. In contrast, in this embodiment, the weight of the EPU 50 can be reduced by reducing the weight of the fan shaft 142.
  • the downstream fan 141 blows air so as to suck out gas from the duct passage 130 and the housing gap 100.
  • This makes it possible to realize a configuration in which the downstream fan 141 functions as a negative pressure fan. With this configuration, pressure loss is less likely to occur in both the duct flow path 130 and the housing gap 100. Therefore, the amount of gas passing through each of the duct flow path 130 and the housing gap 100 tends to increase. Therefore, the heat dissipation effect of each of the duct flow path 130 and the housing gap 100 can be enhanced.
  • the duct flow path 130 becomes a negative pressure due to the air blowing from the downstream fan 141, so that gas easily flows between the outer circumferential wall surfaces 71a, 91a and the outer circumferential duct 120. Therefore, the downstream fan 141 and the outer duct 120 can enhance the heat dissipation effect from the outer circumferential wall surfaces 71a, 91a to the outer circumferential airflows Fb1, Fb2.
  • the gap airflow Fb3 tends to flow in the axial direction AD along the motor axis Cm after flowing out from the outer end opening 95b to the downstream side.
  • the gap airflow Fb3 tends to flow in the radial direction RD along the inverter outer end wall surface 94a after flowing out from the outer end opening 95b to the downstream side.
  • the EPU 50 has a guide plate section 145.
  • the guide plate portion 145 is formed into a plate shape from a metal material or the like.
  • the guide plate portion 145 extends in a direction perpendicular to the axial direction AD.
  • the guide plate portion 145 is provided between the inverter housing 90 and the downstream fan 141 in the axial direction AD.
  • the guide plate portion 145 is provided at a position away from the inverter outer end wall surface 94a toward the downstream fan 141 side, and faces the inverter outer end wall surface 94a.
  • the guide plate portion 145 extends radially outward from the outer end opening 95b.
  • the outer peripheral end of the guide plate portion 145 is located closer to the inverter outer peripheral wall surface 91a than the inverter inner peripheral wall surface 92a in the radial direction RD.
  • the guide plate portion 145 is supported by, for example, the fan shaft 142.
  • the downstream fan 141 projects further radially outward than both the inverter outer end wall surface 94a and the guide plate portion 145.
  • the gap airflow Fb3 flows downstream from the outer end opening 95b due to the negative pressure generated by the downstream fan 141, and then flows radially outward between the guide plate portion 145 and the inverter outer end wall surface 94a. .
  • the guide plate portion 145 guides the gap airflow Fb3 to flow along the inverter outer end wall surface 94a on the downstream side of the inverter through hole 95. As the gap airflow Fb3 flows along the inverter outer end wall surface 94a in this manner, heat is easily released from the inverter outer end wall surface 94a to the gap airflow Fb3.
  • the guide plate portion 145 is provided on the downstream side of the inverter through hole 95 and the inverter outer end wall surface 94a. Therefore, the heat dissipation effect of the inverter outer end wall 94 can be enhanced by the gap airflow Fb3.
  • radiation fins may be provided on the inverter outer end wall surface 94a. Thereby, the heat dissipation effect of the inverter outer end wall 94 can be further enhanced by the heat dissipation fins.
  • the downstream fan 141 as a blower fan is provided downstream of the inverter through hole 95.
  • the blower fan is housed in the inverter through hole 95. Configurations, operations, and effects that are not particularly described in the ninth embodiment are the same as those in the first embodiment. The ninth embodiment will be described with a focus on the points that are different from the first embodiment.
  • the EPU 50 includes a blower device 140 including a downstream fan 141 and a fan shaft 142, similar to the seventh embodiment.
  • the air blower 140 of this embodiment has a hole downstream fan 141A as the downstream fan 141.
  • the EPU 50 does not have the outer circumferential duct 120, unlike the seventh embodiment.
  • the hole downstream fan 141A is accommodated in the inverter through hole 95.
  • the hole downstream fan 141A is provided as the downstream fan 141 on the downstream side of the housing gap 100 in the axial direction AD.
  • the hole downstream fan 141A is provided in the inverter through hole 95 at a position away from the housing gap 100 on the downstream side.
  • the hole downstream fan 141A is provided at a position closer to the outer end opening 95b than the inner end opening 95a in the axial direction AD.
  • the hole downstream fan 141A is an axial fan and blows air in the axial direction AD.
  • the hole downstream fan 141A is provided for the inverter through hole 95, and corresponds to a blower fan, a downstream fan, and a hole fan.
  • the hole downstream fan 141A blows air toward the downstream side in the inverter through hole 95.
  • the hole downstream fan 141A blows air
  • the gas in the inverter through hole 95 is blown out from the outer end opening 95b to the downstream side.
  • the inside of the inverter through hole 95 is more likely to have a negative pressure than the outside of the inverter housing 90.
  • the inside of the inverter through hole 95 becomes negative pressure, external air easily flows into the inner end opening 95a via the housing gap 100.
  • the propulsion device 15 when the motor 61 is driven, negative pressure is generated in the housing gap 100 and the inverter through hole 95 as the hole downstream fan 141A rotates, and airflow flows.
  • This airflow includes the gap airflow Fa2 as in the first embodiment.
  • the hole downstream fan 141A is difficult to apply negative pressure to the outer peripheral side of the motor unit 59.
  • the hole downstream fan 141A is provided in the inverter through hole 95.
  • the inside of the inverter through hole 95 tends to have negative pressure as the hole downstream fan 141A is driven.
  • Inverter through hole 95 functions as a duct for hole downstream fan 141A. Therefore, the gap airflow Fa2 is guided from the housing gap 100 to the inverter through hole 95 by the negative pressure generated by the hole downstream fan 141A, even without providing a dedicated duct in the EPU 50 for making the hole downstream fan 141A function as a negative pressure fan. can. Therefore, the weight of the EPU 50 can be reduced by the positional relationship between the hole downstream fan 141A and the inverter through hole 95.
  • ⁇ Tenth embodiment> an axial fan was used as the downstream fan 141.
  • a centrifugal fan is used as the downstream fan 141.
  • the configuration, operation, and effects not particularly described in the tenth embodiment are the same as those in the ninth embodiment.
  • the tenth embodiment will be described with a focus on the points that are different from the ninth embodiment.
  • the blower device 140 includes a downstream fan 141 and a fan shaft 142, similar to the ninth embodiment.
  • the air blower 140 of this embodiment has a centrifugal downstream fan 141B as the downstream fan 141.
  • the centrifugal downstream fan 141B is a centrifugal fan, and blows out gas sucked in in the axial direction AD in the radial direction RD.
  • the centrifugal downstream fan 141B is provided downstream of the inverter through hole 95 in the axial direction AD.
  • the centrifugal downstream fan 141B sucks gas in the axial direction AD from the inverter through hole 95, and blows the gas radially outward on the downstream side of the inverter housing 90.
  • the centrifugal downstream fan 141B is provided for the inverter through hole 95, and corresponds to a blower fan, a downstream fan, and a hole fan.
  • the EPU 50 has a guide plate portion 145 similarly to the eighth embodiment.
  • the guide plate portion 145 is provided on the opposite side of the inverter housing 90 via the centrifugal downstream fan 141B in the axial direction AD. That is, the centrifugal downstream fan 141B is provided between the guide plate portion 145 and the inverter housing 90.
  • centrifugal downstream fan 141B may be located at any position relative to the inverter through hole 95 as long as it can blow air in the radial direction RD on the downstream side of the inverter housing 90.
  • the centrifugal downstream fan 141B has an air outlet that blows gas, and may be accommodated in the inverter through hole 95 if at least a portion of the air outlet is located downstream of the inverter through hole 95. .
  • This airflow includes a gap airflow Fa2.
  • the centrifugal airflow Fa3 is included in the gap airflow Fa2.
  • the centrifugal airflow Fa3 is an airflow blown outward in the radial direction by the centrifugal downstream fan 141B.
  • the centrifugal airflow Fa3 flows in the radial direction RD between the inverter outer end wall 94 and the guide plate portion 145 along the inverter outer end wall surface 94a. Therefore, heat is easily released from the inverter outer end wall surface 94a to the centrifugal airflow Fa3. Therefore, the heat dissipation effect of the inverter outer end wall 94 can be enhanced by the centrifugal airflow Fa3.
  • a centrifugal downstream fan 141B is provided in the inverter through hole 95.
  • the inside of the inverter through hole 95 tends to become negative pressure as the centrifugal downstream fan 141B is driven.
  • Inverter through hole 95 functions as a duct for centrifugal downstream fan 141B. Therefore, the gap airflow Fa2 is guided from the housing gap 100 to the inverter through hole 95 by the negative pressure generated by the centrifugal downstream fan 141B, even without providing a dedicated duct in the EPU 50 for making the centrifugal downstream fan 141B function as a negative pressure fan. can. There is no need to Therefore, the weight of the EPU 50 can be reduced by the positional relationship between the centrifugal downstream fan 141B and the inverter through hole 95.
  • the blower fan of the blower device 140 is provided as the downstream fan 141 on the downstream side of the housing gap 100.
  • the blower fan of the blower device 140 is provided on the upstream side of the housing gap 100. Configurations, operations, and effects that are not particularly described in the eleventh embodiment are the same as those in the first embodiment. The eleventh embodiment will be described with a focus on points that are different from the first embodiment.
  • the EPU 50 has a blower device 140 similarly to the seventh embodiment.
  • the air blower 140 has an upstream fan 143, unlike the seventh embodiment.
  • the upstream fan 143 is a fan that can blow air.
  • the upstream fan 143 rotates, for example, around the motor axis Cm.
  • the upstream fan 143 is an axial fan and blows air in the axial direction AD.
  • the upstream fan 143 is provided on the upstream side of the motor housing 70.
  • the upstream fan 143 is provided between the motor housing 70 and the propeller 20 in the axial direction AD.
  • upstream fan 143 is provided between motor housing 70 and gear 53.
  • the upstream fan 143 blows air so that the gap airflow Fa2 passes from the housing gap 100, passes through the inverter through hole 95, and flows out from the outer end opening 95b. Note that the upstream fan 143 may be provided between the gear 53 and the propeller 20.
  • the motor housing 70 has a motor inner end wall hole 75.
  • the motor inner end wall hole 75 is provided in the motor inner end wall 73.
  • the motor inner end wall hole 75 penetrates the motor inner end wall 73 in the axial direction AD.
  • the motor shaft 65 is inserted into the motor inner end wall hole 75.
  • the motor shaft 65 reaches the housing gap 100 through the motor inner end wall hole 75.
  • the motor shaft 65 protrudes from the motor inner end wall surface 73a toward the housing gap 100 in the axial direction AD. At least the tip of the motor shaft 65 exists in the housing gap 100.
  • the tip of the motor shaft 65 is provided in the housing gap 100. Therefore, in the housing gap 100, the heat of the motor shaft 65 is directly released to the gap airflow Fa2. Therefore, the heat dissipation effect of the motor shaft 65 can be enhanced by the housing gap 100.
  • the EPU 50 is cooled by gas such as external air.
  • the EPU 50 is cooled by both gas and refrigerant. Configurations, operations, and effects that are not particularly described in the thirteenth embodiment are the same as those in the first embodiment.
  • the 13th embodiment will be described with a focus on the points that are different from the first embodiment.
  • the EPU 50 has a cooling device 150.
  • the cooling device 150 is a cooling system that cools the EPU 50 using a refrigerant.
  • a refrigerant for example, a fluid such as a cooling liquid is used.
  • a cooling method using a refrigerant is sometimes referred to as a liquid cooling method.
  • both an air cooling type and a liquid cooling type are used as cooling methods for the EPU 50.
  • the cooling device 150 has a refrigerant pump 151, a pump shaft 152, and a refrigerant flow path 153.
  • a refrigerant flows through a refrigerant flow path 153.
  • the refrigerant channel 153 is, for example, a circulation channel that circulates a refrigerant.
  • the refrigerant pump 151 pumps the refrigerant in the refrigerant flow path 153 so that the refrigerant flows through the refrigerant flow path 153 .
  • the refrigerant pump 151 is a circulation pump for circulating refrigerant in the refrigerant channel 153.
  • Refrigerant pump 151 is, for example, a centrifugal pump.
  • the refrigerant pump 151 uses the drive of the motor 61 to flow refrigerant into the refrigerant flow path 153 .
  • the pump shaft 152 connects the refrigerant pump 151 and the motor shaft 65.
  • the pump shaft 152 and the refrigerant pump 151 are arranged on the motor shaft 65 in the axial direction AD.
  • Refrigerant pump 151 is provided on the opposite side of motor device 60 via inverter through hole 95 .
  • the pump shaft 152 extends from the motor shaft 65 in the axial direction AD and is inserted into the inverter through hole 95.
  • the motor shaft 65 and the pump shaft 152 rotate as the motor 61 is driven, thereby driving the refrigerant pump 151.
  • the connecting portion between the pump shaft 152 and the motor shaft 65 may be housed in the motor housing 70 or may be provided in the housing gap 100.
  • the pump shaft 152 is lighter than the motor shaft 65. Pump shaft 152 weighs less than motor shaft 65. Pump shaft 152 is thinner than motor shaft 65. The outer diameter of pump shaft 152 is smaller than the outer diameter of motor shaft 65. As for the structure for making the pump shaft 152 lighter than the motor shaft 65, there is a difference in material as in the case of the fan shaft 142 of the seventh embodiment.
  • the coolant flow path 153 is provided so that the coolant cools at least the motor rotor 64.
  • the refrigerant flow path 153 is provided so as to pass through at least the motor rotor 64, the motor shaft 65, the pump shaft 152, and the refrigerant pump 151.
  • the refrigerant flow path 153 has a heat absorption path 153a and a shaft heat radiation path 153b.
  • the heat absorption path 153a is a portion of the refrigerant flow path 153 where the refrigerant absorbs heat from the object to be cooled.
  • the shaft heat radiation path 153b is a portion of the refrigerant flow path 153 through which the refrigerant releases heat to the outside.
  • the heat absorption path 153a is provided to the motor 61 so that the refrigerant absorbs the heat of the motor 61.
  • the heat absorption path 153a is provided to the motor stator 63 so that the refrigerant absorbs at least the heat of the motor stator 63.
  • the cooling device 150 has a heat absorption path forming section that forms a heat absorption path 153a.
  • the heat absorption path forming portion includes at least one of a portion included in the motor stator 63 and a portion attached to the motor stator 63.
  • the shaft heat radiation path 153b is provided in the pump shaft 152 so that the heat of the refrigerant is released to the outside air.
  • the shaft heat radiation path 153b is provided inside the pump shaft 152.
  • the shaft heat radiation path 153b extends in the axial direction AD along the outer peripheral surface of the pump shaft 152.
  • the cooling device 150 has a heat radiation path forming part that forms a shaft heat radiation path 153b.
  • This heat radiation path forming portion is a portion of the pump shaft 152 that forms a shaft heat radiation path 153b.
  • the heat of the refrigerant is released from the shaft heat radiation path 153b to the housing gap 100 and the inverter through hole 95 through this portion.
  • the shaft heat radiation path 153b may be provided in the motor shaft 65 in addition to the pump shaft 152.
  • the shaft heat radiation path 153b is provided inside the motor shaft 65.
  • the shaft heat radiation path 153b extends in the axial direction AD along the outer peripheral surface of the motor shaft 65.
  • This heat radiation path forming portion is a portion of the motor shaft 65 that forms the shaft heat radiation path 153b. In the motor shaft 65, the heat of the refrigerant is released from the shaft heat radiation path 153b to the housing gap 100 via this portion.
  • the EPU 50 includes a blower device 140 including a hole downstream fan 141A.
  • a hole downstream fan 141A is provided on the pump shaft 152.
  • the hole downstream fan 141A rotates and the gap airflow Fa2 flows.
  • the gap airflow Fa2 flows along the outer peripheral surface of the pump shaft 152 in the housing gap 100 and the inverter through hole 95. That is, the gap airflow Fa2 flows along the shaft heat radiation path 153b. Therefore, the refrigerant flowing through the shaft heat radiation path 153b easily releases heat to the gap airflow Fa2 via the pump shaft 152.
  • the cooling device 150 cools at least a portion of the motor 61 using a refrigerant.
  • a refrigerant in addition to air cooling of the EPU 50 using airflows Fa1, Fa2, etc., liquid cooling of the EPU 50 using a refrigerant can be performed. Therefore, the cooling effect of the EPU 50 can be enhanced by both air cooling and liquid cooling. For example, in a configuration in which the EPU 50 is cooled by only one of air cooling and liquid cooling, there is a concern that the cooling effect of the EPU 50 may be insufficient.
  • the refrigerant in the refrigerant flow path 153, the refrigerant is cooled by gas such as the gap airflow Fa2 flowing through the housing gap 100.
  • gas such as the gap airflow Fa2 flowing through the housing gap 100.
  • the heat of the refrigerant is released to the outside via the pump shaft 152.
  • the pump shaft 152 for driving the refrigerant pump 151 can be used to radiate heat from the refrigerant. Therefore, the weight of the EPU 50 can be reduced compared to a configuration including a dedicated member for dissipating heat from the refrigerant.
  • the pump shaft 152 is provided so that the gap airflow Fa2 flowing through the housing gap 100 flows along the pump shaft 152.
  • the gap airflow Fa2 flows along the outer peripheral surface of the pump shaft 152 in both the housing gap 100 and the inverter through hole 95. Therefore, the refrigerant flowing through the shaft heat radiation path 153b is easily cooled by the gap airflow Fa2. Therefore, the cooling effect of the refrigerant in the pump shaft 152 can be enhanced.
  • the refrigerant pump 151 is provided at a position remote from the inverter housing 90 on the downstream side in the axial direction AD.
  • Refrigerant pump 151 extends in a direction perpendicular to axial direction AD.
  • the refrigerant pump 151 extends in the radial direction RD along the inverter outer end wall surface 94a, and faces the inverter outer end wall surface 94a.
  • the outer circumferential end of the refrigerant pump 151 is located closer to the inverter outer circumferential wall surface 91a than the inverter inner circumferential wall surface 92a in the radial direction RD.
  • the refrigerant flow path 153 has a pump heat radiation path 153c.
  • the pump heat radiation path 153c is a portion of the refrigerant flow path 153 through which the refrigerant releases heat to the outside.
  • the pump heat radiation path 153c is provided in the refrigerant pump 151 so that the heat of the refrigerant is released to the outside air.
  • the pump heat radiation path 153c is provided inside the refrigerant pump 151.
  • the pump heat radiation path 153c extends in the radial direction RD along the outer surface of the refrigerant pump 151.
  • the cooling device 150 has a heat radiation path forming part that forms a pump heat radiation path 153c.
  • This heat radiation path forming portion is a portion of the refrigerant pump 151 that forms a pump heat radiation path 153c.
  • the heat of the refrigerant is released to the outside from the pump heat radiation path 153c via this portion.
  • the gap airflow Fa2 flows downstream from the inverter through hole 95, it flows radially outward between the inverter outer end wall surface 94a and the refrigerant pump 151.
  • the gap airflow Fa2 flows along the outer surface of the refrigerant pump 151. That is, the gap airflow Fa2 flows along the pump heat radiation path 153c. Therefore, the refrigerant flowing through the pump heat radiation path 153c easily releases heat to the gap airflow Fa2 via the refrigerant pump 151.
  • the refrigerant pump 151 is provided so that the gap airflow Fa2 flowing through the housing gap 100 flows along the refrigerant pump 151.
  • the gap airflow Fa2 flows between the inverter outer end wall surface 94a and the refrigerant pump 151 along the outer surface of the refrigerant pump 151. Therefore, the refrigerant flowing through the pump heat radiation path 153c is easily cooled by the gap airflow Fa2. Therefore, the cooling effect of the refrigerant in the refrigerant pump 151 can be enhanced.
  • the inverter housing 90 was provided with the inverter through hole 95.
  • the inverter housing 90 is not provided with the inverter through hole 95. Configurations, operations, and effects that are not particularly described in the fifteenth embodiment are the same as those in the first embodiment. The fifteenth embodiment will be described with a focus on the points that are different from the first embodiment.
  • the EPU 50 does not have an inverter through hole 95. Therefore, in the EPU 50, the housing gap 100 is not open in the axial direction AD. In this embodiment, the heat of the motor housing 70 and the inverter housing 90 is released to the outside through the housing gap 100 radially outward from the gap opening 100a. Therefore, even if the inverter housing 90 does not have the inverter through hole 95, the heat existing at the boundary between the motor housing 70 and the inverter housing 90 is easily released to the outside. Therefore, the housing gap 100 can prevent heat from accumulating at the boundary between the motor housing 70 and the inverter housing 90.
  • connection portion between the motor housing 70 and the inverter housing 90 is provided on the outer peripheral side of the housing gap 100. Configurations, operations, and effects that are not particularly described in the sixteenth embodiment are the same as those in the first embodiment. The 16th embodiment will be described with a focus on points that are different from the first embodiment.
  • the EPU 50 has an outer peripheral connection portion 160.
  • the outer peripheral connection portion 160 is a connection portion that connects the motor housing 70 and the inverter housing 90 in the EPU 50 . At least a portion of the outer circumferential connection portion 160 is located radially outward of the housing gap 100.
  • a plurality of outer peripheral connecting portions 160 are arranged in the circumferential direction CD.
  • the outer peripheral connection portion 160 has a function as a spacer in addition to a function as a connection portion.
  • the outer peripheral connection portion 160 serves as a spacer and forms a housing gap 100 between the motor housing 70 and the inverter housing 90.
  • the outer peripheral connection part 160 has a motor side flange 161, an inverter side flange 162, and an outer peripheral fixture 163.
  • the motor side flange 161 is a part of the motor housing 70, and is a flange provided on the motor outer peripheral wall surface 71a.
  • the motor side flange 161 protrudes from the motor outer peripheral wall 71 both radially outward and toward the inverter housing 90 side.
  • the inverter side flange 162 is a part of the inverter housing 90, and is a flange provided on the inverter outer peripheral wall surface 91a.
  • the inverter side flange 162 protrudes from the inverter outer peripheral wall surface 91a both radially outward and toward the motor housing 70 side.
  • a motor side flange 161 and an inverter side flange 162 are lined up in the axial direction AD.
  • the motor side flange 161 and the inverter side flange 162 are stacked on top of each other so as to form a housing gap 100 between the motor housing 70 and the inverter housing 90.
  • the outer peripheral fixture 163 is a fixture such as a bolt. The outer peripheral fixture 163 connects the motor housing 70 and the inverter housing 90 by fixing the motor side flange 161 and the inverter side flange 162.
  • connection portion between the motor housing 70 and the inverter housing 90 is provided in the housing gap 100.
  • Configurations, operations, and effects that are not particularly described in the seventeenth embodiment are the same as those in the first embodiment.
  • the seventeenth embodiment will be described with a focus on points that are different from the first embodiment.
  • the EPU 50 has a gap connection part 170.
  • Gap connection portion 170 is a connection portion that connects motor housing 70 and inverter housing 90 in EPU 50 . At least a portion of the gap connection portion 170 is provided in the housing gap 100. A plurality of gap connection parts 170 are provided in the housing gap 100.
  • the gap connecting portion 170 has a function as a spacer in addition to a function as a connecting portion.
  • Gap connection part 170 forms a housing gap 100 between motor housing 70 and inverter housing 90 as a spacer.
  • the gap connection section 170 is configured to include the gap spacer 101.
  • the gap connection section 170 includes a motor side fixture 171 and an inverter side fixture 172.
  • the gap spacer 101 has a spacer base 101a and spacer flanges 101b and 101c.
  • the spacer base 101a extends in the axial direction AD in a columnar or cylindrical shape.
  • the spacer flange 101b extends from the spacer base 101a along the motor inner end wall surface 73a.
  • the spacer flange 101c extends from the spacer base 101a along the inverter inner end wall surface 93a.
  • the fixtures 171 and 172 are fixtures such as bolts.
  • the motor side fixture 171 fixes the gap spacer 101 to the motor housing 70.
  • the motor side fixture 171 fixes the spacer flange 101b to the motor inner end wall 73.
  • the inverter side fixture 172 fixes the gap spacer 101 to the inverter housing 90.
  • the inverter side fixture 172 fixes the spacer flange 101c to the inverter inner end wall 93.
  • the motor shaft 65 has a hollow structure. Configurations, operations, and effects not particularly described in the eighteenth embodiment are the same as those in the first embodiment.
  • the 18th embodiment will be described with a focus on points that are different from the first embodiment.
  • the motor shaft 65 is formed in a cylindrical shape and extends in the axial direction AD.
  • the motor shaft 65 has a shaft space 66.
  • the shaft space 66 is an internal space of the motor shaft 65.
  • the shaft space 66 extends in the axial direction AD along the motor axis Cm.
  • the center line of the shaft space 66 coincides with the motor axis Cm.
  • the shaft space 66 is formed by the inner peripheral surface of the motor shaft 65.
  • the hollow structure of the motor shaft 65 includes a shaft space 66.
  • Shaft space 66 is sometimes referred to as a hollow portion.
  • Motor shaft 65 is sometimes referred to as a hollow shaft.
  • the motor shaft 65 has a shaft upper end surface 65a, a shaft lower end surface 65b, and a shaft outer peripheral surface 65c.
  • the shaft upper end surface 65a, the shaft lower end surface 65b, and the shaft outer peripheral surface 65c are included in the outer surface of the motor shaft 65.
  • the shaft outer circumferential surface 65c is the outer circumferential surface of the motor shaft 65.
  • the shaft upper end surface 65a is the end surface facing the propeller 20 of the pair of end surfaces that the motor shaft 65 has.
  • the shaft lower end surface 65b is an end surface facing away from the propeller 20. For the propeller wind generated by the propeller 20, the shaft upper end surface 65a faces upstream, and the shaft lower end surface 65b faces downstream.
  • the motor shaft 65 has an outer peripheral portion that forms a shaft outer peripheral surface 65c.
  • the shaft space 66, the shaft upper end surface 65a, and the shaft lower end surface 65b are also formed by the outer peripheral portion.
  • the outer peripheral portion is a fleshy portion of the motor shaft 65.
  • the motor shaft 65 passes through the motor housing 70 in the axial direction AD.
  • the motor shaft 65 is exposed to both the external space on the side of the motor outer end wall surface 74a and the housing gap 100.
  • the shaft space 66 is open toward an external space on the side of the motor outer end wall surface 74a, and is also open toward the housing gap 100.
  • the shaft space 66 communicates the external space on the motor outer end wall surface 74a side with the housing gap 100.
  • the external space on the motor outer end wall surface 74 a side is an external space located on the upstream side of the motor housing 70 .
  • the motor shaft 65 has a shaft upper end opening 66a and a shaft lower end opening 66b.
  • the shaft upper end port 66a and the shaft lower end port 66b are openings that open the shaft space 66 to the outside of the motor shaft 65.
  • the shaft upper end opening 66a opens the shaft space 66 to the upstream side of the motor housing 70.
  • the shaft upper end opening 66a is provided on the shaft upper end surface 65a.
  • the shaft lower end opening 66b opens the shaft space 66 to the downstream side of the motor housing 70.
  • the shaft lower end opening 66b is provided on the shaft lower end surface 65b.
  • the shaft space 66 communicates with the inverter through hole 95 via the housing gap 100.
  • the motor shaft 65 fits into the housing gap 100.
  • a shaft lower end surface 65b and a shaft lower end opening 66b are provided in the housing gap 100.
  • the shaft lower end surface 65b and the shaft lower end opening 66b are provided at a position away from the inverter through hole 95 in the axial direction AD.
  • the motor shaft 65 has a shaft space 66.
  • the weight of the motor shaft 65 can be reduced by the amount of the shaft space 66.
  • the heat dissipation effect of the motor shaft 65 can be enhanced by utilizing the shaft space 66. For example, if the shaft space 66 is open to the outside of the motor shaft 65 through an opening such as the shaft upper end opening 66a, the heat of the motor shaft 65 is released to the outside from this opening. Therefore, it is possible to suppress heat from accumulating inside the motor shaft 65.
  • the heat dissipation effect of the motor device 60 can be enhanced by the shaft space 66.
  • the hollow structure of the motor shaft 65 is realized by a shaft space 66. Therefore, the shaft space 66 can be effectively utilized from various functional viewpoints, such as reducing the weight of the propulsion device 15 and increasing the heat dissipation effect of the propulsion device 15.
  • the shaft space 66 communicates with the external space of the motor housing 70.
  • the heat of the motor shaft 65 is easily released from the shaft space 66 to the external space of the motor housing 70. Therefore, even if the heat of the motor stator 63 or the motor rotor 64 is applied to the motor shaft 65, the heat is unlikely to be trapped inside the motor shaft 65. That is, it is possible to suppress heat from accumulating inside the motor shaft 65.
  • the heat inside the motor 61 can be released to the gas in the shaft space 66. Further, since the shaft space 66 communicates with the external space, the heat inside the motor 61 can be released to the external space via the shaft space 66. In this way, discharging the heat of the motor stator 63 and the motor rotor 64 to the outside from the shaft space 66 as the heat inside the motor 61 is effective in cooling the motor device 60.
  • the housing gap 100 is open to the outside of the EPU 50 via both the shaft space 66 and the inverter through hole 95.
  • gas easily flows between the shaft space 66 and the inverter through hole 95 via the housing gap 100. Therefore, the heat in the housing gap 100, the heat in the inverter through hole 95, and the heat in the motor shaft 65 can be released to the outside of the EPU 50.
  • the inverter through hole 95 is formed by the inverter inner peripheral wall surface 92a, which is a contact surface with gas, heat is easily released from the inverter inner peripheral wall surface 92a to the gas on the inner peripheral side. Therefore, the heat dissipation effect of the inverter device 80 can be enhanced by the inverter through hole 95 and the shaft space 66.
  • the shaft space 66 may be open to the external space via the EPU shaft 51 or the propeller shaft.
  • the shaft space 66 may communicate with the internal space of the EPU shaft 51 or the internal space of the propeller shaft, and an opening for opening the shaft space 66 may be provided on the outer surface of the EPU shaft 51 or the outer surface of the propeller shaft.
  • the shaft upper end opening 66a and the shaft lower end opening 66b may be provided on the shaft outer peripheral surface 65c.
  • the shaft upper end opening 66a may be provided on the shaft outer circumferential surface 65c of a portion of the motor shaft 65 that protrudes upstream from the motor housing 70.
  • the shaft lower end opening 66b may be provided on the shaft outer circumferential surface 65c of a portion of the motor shaft 65 that protrudes downstream from the motor housing 70.
  • the motor shaft 65 may enter the inverter through hole 95.
  • the motor shaft 65 may extend toward the inside of the inverter through hole 95 such that the shaft lower end surface 65b is located inside the inverter through hole 95.
  • the shaft space 66 directly communicates with the inverter through hole 95 without passing through the housing gap 100.
  • the inverter housing 90 has the inverter through hole 95.
  • the inverter housing 90 does not have the inverter through hole 95. Configurations, operations, and effects not particularly described in the nineteenth embodiment are the same as those in the eighteenth embodiment.
  • the 19th embodiment will be described with a focus on points that are different from the 18th embodiment.
  • the inverter housing 90 is not provided with an inverter through hole 95.
  • Inverter through holes 95 are not provided in the shaft space 66 at positions lined up in the axial direction AD.
  • the shaft spaces 66 are arranged on the inverter inner end wall surface 93a with the housing gap 100 interposed therebetween.
  • the shaft lower end port 66b faces the inverter inner end wall surface 93a.
  • the housing gap 100 communicates with the external space of the motor housing 70 via the shaft space 66. Therefore, it is possible to realize a configuration in which the heat inside the motor 61 is released to the outside through the shaft space 66.
  • the motor shaft 65 is provided at a position away from the inverter through hole 95 in the axial direction AD. In contrast, in the twentieth embodiment, the motor shaft 65 is inserted into the inverter through hole 95. Configurations, operations, and effects not particularly described in the 20th embodiment are the same as those in the 18th embodiment. The 20th embodiment will be described with a focus on the points that are different from the 18th embodiment.
  • the motor shaft 65 is inserted into the inverter through hole 95 and projects downstream from the inverter housing 90.
  • a shaft lower end surface 65b and a shaft lower end opening 66b are located downstream from the inverter housing 90.
  • Motor shaft 65 is thinner than inverter through hole 95.
  • the shaft outer circumferential surface 65c is located at a position radially inwardly away from the inverter inner circumferential wall surface 92a.
  • a ventilable gap is formed between the shaft outer circumferential surface 65c and the inverter inner circumferential wall surface 92a.
  • the motor shaft 65 does not need to protrude downstream from the inverter through hole 95.
  • the shaft lower end port 66b does not need to be separated downstream from the inverter through hole 95.
  • the shaft lower end port 66b may be provided inside the inverter through hole 95.
  • the inverter housing 90 is provided with the inverter through hole 95, the heat transmitted from the inverter 81 and the motor control unit 82 to the inverter through hole 95 is transferred to the external space on the inverter outer end wall surface 94a side through the inverter through hole 95. Easily released.
  • the external space on the inverter outer end wall surface 94a side is an external space on the downstream side of the inverter housing 90.
  • the gas passage in the inverter through hole 95 tends to become narrower by the amount of the motor shaft 65. Even so, since a ventilation gap is formed in the inverter through hole 95 on the outer peripheral side of the motor shaft 65, gas such as outside air can flow through this gap. Therefore, even if the motor shaft 65 is inserted through the inverter through hole 95, the heat of the inverter device 80 can be released from the inverter through hole 95 to the external space on the side of the inverter outer end wall surface 94a. Therefore, the cooling effect of the inverter device 80 can be enhanced by the inverter through hole 95.
  • Cooling devices include ventilation fans and circulation pumps.
  • the blower fan is the downstream fan 141 or the like.
  • the circulation pump is a refrigerant pump 151 or the like.
  • the pitch controller is a device that can change the pitch of the propeller 20. For example, the pitch controller can change the angle of the blade 21.
  • the motor housing 70 is provided upstream of the inverter housing 90.
  • the inverter housing 90 is provided upstream of the motor housing 70. Configurations, operations, and effects that are not particularly described in the twenty-first embodiment are the same as those in the twentieth embodiment.
  • the twenty-first embodiment will be described with a focus on the points that are different from the above-mentioned twentieth embodiment.
  • the inverter housing 90 is provided between the gear 53 and the motor housing 70 in the axial direction AD.
  • Motor shaft 65 extends upstream from motor housing 70 .
  • the motor shaft 65 is inserted into the inverter through hole 95 and connected to the propeller 20 .
  • the shaft upper end port 66a is provided on the upstream side of the inverter housing 90.
  • the shaft space 66 is open toward the external space on the side of the inverter outer end wall surface 94a.
  • the external space on the side of the inverter outer end wall surface 94a is an external space located on the upstream side of the inverter housing 90.
  • a downstream fan 141 that is a blower fan is provided downstream of the motor housing 70 and the inverter housing 90.
  • a blower fan is provided between the motor housing 70 and the inverter housing 90. Configurations, operations, and effects that are not particularly described in the twenty-second embodiment are the same as those in the seventh embodiment.
  • the twenty-second embodiment will be mainly described with respect to points different from the seventh embodiment.
  • the EPU 50 has an intermediate fan 144.
  • the intermediate fan 144 is a fan that can blow air.
  • Intermediate fan 144 is provided between motor housing 70 and inverter housing 90.
  • An intermediate fan 144 is provided in the housing gap 100.
  • the intermediate fan 144 corresponds to a gap fan.
  • Intermediate fan 144 is fixed to motor shaft 65.
  • the motor shaft 65 projects from the motor housing 70 toward the housing gap 100 side.
  • An intermediate fan 144 is fixed to this protruding portion.
  • Intermediate fan 144 rotates together with motor shaft 65.
  • the intermediate fan 144 is an axial fan and blows air in the axial direction AD.
  • the intermediate fan 144 can cause gas to flow in the axial direction AD in the duct flow path 130.
  • the intermediate fan 144 extends radially outward from the motor outer peripheral wall surface 71a and the inverter outer peripheral wall surface 91a.
  • the first outer peripheral airflow Fb1 flows as the intermediate fan 144 rotates.
  • the first outer circumferential airflow Fb1 flows in the same direction as the propeller wind in the axial direction AD.
  • gas tends to flow in the radial direction RD and axial direction AD as the intermediate fan 144 rotates.
  • the outer peripheral duct 120 has a uniform size in the radial direction RD, such as the inner diameter, in the axial direction AD. Therefore, the first outer circumferential airflow Fb1 tends to flow along the motor outer circumferential fins 79 and the inverter outer circumferential fins 99 after it flows into the duct passage 130 from the duct upstream opening 121 until it flows out from the duct downstream opening 122. .
  • the upstream duct 125 and the downstream duct 126 have the same size in the radial direction RD.
  • an intermediate fan 144 is provided in the housing gap 100.
  • a gas flow is likely to occur in the housing gap 100 as the intermediate fan 144 rotates, so that heat in the housing gap 100 is likely to be released to the duct flow path 130 or the like. Therefore, the heat dissipation effect of the housing gap 100 can be enhanced by the intermediate fan 144.
  • the intermediate fan 144 is provided in the housing gap 100, there is no need to provide the upstream fan 143 or the downstream fan 141. In this way, compared to a configuration in which the blower fan is provided at a position different from the housing gap 100, it is possible to suppress an increase in the size of the EPU 50 in the axial direction AD.
  • the intermediate fan 144 is provided between the motor housing 70 and the inverter housing 90, it is located as close as possible to both the motor device 60 and the inverter device 80. Therefore, the motor device 60 and the inverter device 80 can be placed at a position where the amount and speed of airflow generated by the intermediate fan 144 are as large as possible. Therefore, the intermediate fan 144 can efficiently flow gas to the motor heat radiating section and the inverter heat radiating section.
  • the motor heat radiating portion is a portion of the motor device 60 from which heat is easily radiated, and is, for example, a portion of the motor housing 70 that includes the motor outer peripheral fins 79.
  • the inverter heat radiation portion is a portion of the inverter device 80 from which heat is easily released, and is, for example, a portion of the inverter housing 90 that includes the inverter outer peripheral fins 99.
  • the intermediate fan 144 may blow air so that the gas flows in the opposite direction to the propeller wind.
  • a reverse airflow may flow in the opposite direction to the first outer peripheral airflow Fb1.
  • This reverse airflow flows into the duct flow path 130 from the duct downstream opening 122 and flows out from the duct upstream opening 121.
  • Examples of configurations in which a reverse airflow flows as the intermediate fan 144 rotates include a configuration in which the blades of the intermediate fan 144 are oriented in opposite directions.
  • the intermediate fan 144 can flow the gas in the axial direction AD.
  • the intermediate fan 144 can flow the gas in the radial direction RD.
  • Configurations, operations, and effects that are not particularly described in the twenty-third embodiment are the same as those in the twenty-second embodiment.
  • the twenty-third embodiment will be described with a focus on points that are different from the twenty-second embodiment.
  • the outer duct 120 has a duct ventilation hole 123.
  • the duct ventilation holes 123 are provided in the housing gap 100 and the intermediate fan 144 at positions aligned in the radial direction RD.
  • the duct ventilation hole 123 is provided on the outside of the intermediate fan 144 in the radial direction.
  • the inverter housing 90 does not have the inverter through hole 95.
  • the intermediate fan 144 is a centrifugal fan, and blows air outward in the radial direction.
  • the intermediate fan 144 rotates, the first outward forward flow Fb4 and the first outward reverse flow Fc1 flow in the duct flow path 130.
  • the first outward forward flow Fb4 and the first outward reverse flow Fc1 flow in the axial direction AD so as to be sucked into the intermediate fan 144.
  • the first outward forward flow Fb4 flows through the duct flow path 130 in the same direction as the propeller wind.
  • the first outer downstream flow Fb4 flows into the duct flow path 130 from the duct upstream opening 121 and flows in the axial direction AD along the motor outer peripheral wall surface 71a.
  • the first outer forward flow Fb4 then flows out from the duct ventilation hole 123 toward the outside in the radial direction.
  • the first outer forward flow Fb4 corresponds to the motor airflow.
  • the first external backward flow Fc1 flows in the duct flow path 130 in the opposite direction to the propeller wind and the first external forward flow Fb4.
  • the first external backflow Fc1 flows into the duct flow path 130 from the duct downstream port 122 and flows in the axial direction AD along the inverter outer peripheral wall surface 91a. Then, the first external backflow Fc1 flows out from the duct ventilation hole 123 toward the outside in the radial direction.
  • the first external backflow Fc1 corresponds to the inverter airflow.
  • the first outer downstream flow Fb4 flows in the axial direction AD along the motor outer circumferential wall surface 71a of the motor outer circumferential wall surface 71a and the inverter outer circumferential wall surface 91a, and then flows out from the duct ventilation hole 123. Therefore, the first outer downstream flow Fb4 can cool the motor outer peripheral wall 71 in a state where the heat of the inverter outer peripheral wall 91 is not applied. In other words, the motor outer peripheral wall 71 can be cooled by the fresh air called the first outward forward flow Fb4. Therefore, it can be avoided that the heat dissipation effect of the motor outer peripheral wall 71 due to the first outer downstream flow Fb4 is reduced by the heat of the inverter outer peripheral wall 91.
  • the first external backflow Fc1 flows in the axial direction AD along the inverter outer circumferential wall surface 91a of the motor outer circumferential wall surface 71a and the inverter outer circumferential wall surface 91a, and then flows out from the duct ventilation hole 123. Therefore, the first external backflow Fc1 can cool the inverter outer peripheral wall 91 in a state where the heat of the motor outer peripheral wall 71 is not applied. That is, the inverter outer peripheral wall 91 can be cooled by the fresh air called the first external backflow Fc1. Therefore, it is possible to prevent the heat dissipation effect of the inverter outer circumferential wall 91 from being reduced by the heat of the motor outer circumferential wall 71 due to the first external backflow Fc1.
  • the intermediate fan 144 blows air so that the first outward forward flow Fb4 and the first outward reverse flow Fc1 flow in opposite directions in the duct flow path 130. Therefore, the intermediate fan 144 can realize a configuration in which the first outward forward flow Fb4 flows along one of the motor outer circumferential wall 71 and the inverter outer circumferential wall 91, and the first outward reverse flow Fc1 flows along the other. Therefore, both the heat dissipation effect of the motor housing 70 and the heat dissipation effect of the inverter housing 90 can be improved by one ventilation fan, the intermediate fan 144.
  • first outer forward flow Fb4 and the first outer reverse flow Fc1 do not have to flow in the axial direction AD in a direction toward each other.
  • first outer forward flow Fb4 and the first outer reverse flow Fc1 may flow in the axial direction AD in a direction that moves away from each other.
  • intermediate fan 144 may rotate to draw gas from duct vent 123.
  • the first external forward flow Fb4 and the first external reverse flow Fc1 flow into the duct passage 130 from the duct ventilation hole 123, flow through the duct passage 130 in the axial direction AD, and exit from the duct upstream opening 121 and the duct downstream opening 122. It leaks outside.
  • the first outward downstream flow Fb4 flows in from the duct ventilation hole 123, flows through the duct flow path 130 along the inverter housing 90, and flows out from the duct downstream opening 122.
  • the first external backflow Fc1 flows through the duct ventilation hole 123, flows backward through the duct passage 130 along the motor housing 70, and flows out from the duct upstream opening 121.
  • the inverter housing 90 does not have the inverter through hole 95.
  • an inverter housing 90 has an inverter through hole 95. Configurations, operations, and effects that are not particularly described in the twenty-fourth embodiment are the same as those in the twenty-third embodiment. The twenty-fourth embodiment will be described with a focus on the points that are different from the twenty-third embodiment.
  • the EPU 50 has a duct unit 180.
  • Duct unit 180 houses motor unit 59.
  • the duct unit 180 also covers the motor unit 59 from at least one side in the axial direction AD.
  • the duct unit 180 has a lower cover part 182.
  • the lower cover portion 182 is provided to cover the motor unit 59 from the downstream side in the axial direction AD.
  • the lower cover portion 182 extends in a direction perpendicular to the axial direction AD.
  • Lower cover portion 182 is provided at a position remote from inverter housing 90 on the downstream side.
  • the lower cover part 182 is fixed to the outer duct 120.
  • the lower cover portion 182 is made of a resin material or the like.
  • the EPU 50 has a lower cover channel 186.
  • the lower cover channel 186 is a space between the motor unit 59 and the lower cover part 182.
  • the lower cover channel 186 extends along the inverter outer end wall surface 94a.
  • the lower cover channel 186 is included in the internal space of the duct unit 180.
  • the internal space of the duct unit 180 includes a duct flow path 130 in addition to the lower cover flow path 186.
  • the duct flow path 130 and the lower cover flow path 186 are continuous spaces.
  • Lower cover channel 186 communicates with inverter through hole 95 .
  • the lower cover part 182 has an inner lower cover hole 182b.
  • the inner and lower cover holes 182b penetrate the lower cover portion 182 in the axial direction AD.
  • the inner and lower cover holes 182b are provided at positions radially inwardly away from the outer circumferential duct 120.
  • the inner and lower cover holes 182b are provided at positions closer to the motor axis Cm in the radial direction RD.
  • the inner and lower cover holes 182b are provided at positions aligned with the inverter through hole 95 in the axial direction AD.
  • a first outer forward flow Fb4, a second outer backflow Fc2, and a first inner backflow Fc3 are generated inside the duct unit 180.
  • the second outer backflow Fc2 and the first inner backflow Fc3 flow into the lower cover channel 186 from the inner and lower cover holes 182b so as to be sucked into the intermediate fan 144.
  • the second external backflow Fc2 flows radially outward in the lower cover flow path 186, passes through the duct flow path 130, and flows out from the duct ventilation hole 123.
  • the second external backflow Fc2 flows through the duct flow path 130 in the opposite direction to the first external forward flow Fb4, similar to the first external backflow Fc1 of the twenty-third embodiment.
  • the second external backflow Fc2 flows in the duct flow path 130 in the axial direction AD along the inverter outer peripheral wall surface 91a.
  • the second external backflow Fc2 corresponds to the inverter airflow.
  • the first internal backflow Fc3 passes through the lower cover flow path 186 in the axial direction AD, flows into the inverter through hole 95, and flows radially outward through the housing gap 100. Then, the first internal backflow Fc3 passes from the housing gap 100 through the duct flow path 130 in the radial direction RD, and flows out from the duct ventilation hole 123 to the outside.
  • the motor housing 70 is provided upstream of the inverter housing 90.
  • the inverter housing 90 is provided upstream of the motor housing 70.
  • the inverter housing 90 is provided between the gear 53 and the motor housing 70 in the axial direction AD, similarly to the twenty-first embodiment.
  • the EPU 50 includes a duct unit 180 similarly to the twenty-fourth embodiment. Unlike the twenty-fourth embodiment described above, the duct unit 180 covers the motor unit 59 from both sides in the axial direction AD.
  • the duct unit 180 has an upper cover part 181 in addition to the outer duct 120 and a lower cover part 182.
  • the upper cover portion 181 is provided to cover the motor unit 59 from the upstream side in the axial direction AD.
  • the upper cover portion 181 extends in a direction perpendicular to the axial direction AD.
  • Upper cover portion 181 is provided between inverter housing 90 and gear 53 in axial direction AD.
  • Upper cover portion 181 is provided at a position away from inverter housing 90 on the upstream side.
  • the upper cover part 181 is fixed to the outer circumferential duct 120.
  • the upper cover portion 181 is made of a resin material or the like.
  • the EPU 50 has an upper cover channel 185.
  • the upper cover channel 185 is a space between the motor unit 59 and the upper cover part 181.
  • Upper cover channel 185 extends along inverter outer end wall surface 94a.
  • Upper cover channel 185 is provided between inverter housing 90 and gear 53 in axial direction AD.
  • the upper cover channel 185 is included in the internal space of the duct unit 180.
  • the upper cover flow path 185 and the duct flow path 130 are a continuous space.
  • the upper cover flow path 185 communicates with the lower cover flow path 186 via the duct flow path 130.
  • Upper cover channel 185 communicates with inverter through hole 95 .
  • the upper cover part 181 has an outer upper cover hole 181a.
  • the outer upper cover hole 181a passes through the upper cover portion 181 in the axial direction AD.
  • the outer upper cover hole 181a is provided at a position radially outward from the motor axis Cm.
  • the outer upper cover hole 181a is provided at a position closer to the outer circumferential duct 120 in the radial direction RD.
  • the outer upper cover holes 181a are provided in the duct flow path 130 at positions aligned in the axial direction AD.
  • the gear 53 is adjacent to the inverter housing 90 in the axial direction AD.
  • the gear 53 corresponds to a gear device
  • the inverter housing 90 corresponds to an adjacent housing.
  • the gear 53 can change the rotational speed of the motor shaft 65 and output it to the propeller 20.
  • the gear 53 and the motor housing 70 are located apart in the axial direction AD.
  • the EPU 50 has a gear gap 54.
  • Gear gap 54 is a gap between gear 53 and inverter housing 90.
  • the gear gap 54 is open radially outward.
  • the housing gap 100 may be referred to as a first gap
  • the gap between the gear device and the adjacent housing may be referred to as a second gap.
  • While the duct unit 180 houses the inverter housing 90, it does not house the gear 53.
  • An upper cover portion 181 is provided between the inverter housing 90 and the gear 53. At least a portion of the upper cover portion 181 is provided in the gear gap 54.
  • Upper cover channel 185 is provided between gear 53 and inverter housing 90. At least a portion of the upper cover channel 185 is included in the gear gap 54.
  • the gear gap 54 and the upper cover channel 185 are arranged in the inverter through hole 95 in the axial direction AD.
  • the gear gap 54 and the upper cover flow path 185 communicate with the inverter through hole 95.
  • a first outer forward flow Fb4, a first inner forward flow Fb5, and a second outer reverse flow Fc2 are generated inside the duct unit 180.
  • the first outer downstream flow Fb4 and the first inner downstream flow Fb5 flow into the upper cover channel 185 from the outer upper cover hole 181a so as to be sucked into the intermediate fan 144.
  • the first outer downstream flow Fb4 passes through the upper cover flow path 185 in the axial direction AD, flows into the duct flow path 130, and flows out from the duct ventilation hole 123.
  • the first inner downstream flow Fb5 flows radially inward through the upper cover flow path 185 and flows into the inverter through hole 95 while passing between the inverter housing 90 and the gear 53.
  • the first inner downstream flow Fb5 flows radially outward through the housing gap 100, passes through the duct passage 130 in the radial direction RD, and flows out from the duct ventilation hole 123.
  • an upper cover flow path 185 is provided as a gap between the gear 53 and the motor housing 70.
  • heat existing between the gear 53 and the motor housing 70 is easily released to the outside of the EPU 50 from the upper cover flow path 185. Therefore, heat can be prevented from accumulating at the boundary between the gear 53 and the motor housing 70.
  • the contact area that comes into contact with gas increases by the amount of the upper cover flow path 185. Therefore, the heat of the motor housing 70 is easily released into the gas. Therefore, the motor housing 70 can be efficiently cooled by the upper cover channel 185.
  • the motor shaft 65 does not have a hollow structure.
  • the motor shaft 65 has a hollow structure. Configurations, operations, and effects that are not particularly described in the twenty-sixth embodiment are the same as those in the twenty-fourth embodiment.
  • the twenty-sixth embodiment will be described with a focus on points that are different from the twenty-fourth embodiment.
  • the motor shaft 65 has a shaft space 66 similarly to the eighteenth embodiment.
  • the shaft space 66 is open to the housing gap 100 through a shaft lower end opening 66b.
  • the shaft lower end port 66b is provided on the inverter housing 90 side of the intermediate fan 144. Note that, as long as the shaft lower end port 66b is provided in the housing gap 100, it may be provided in the intermediate fan 144 at a position lined up in the radial direction RD, or it may be provided in the motor housing 70 side of the intermediate fan 144. good.
  • the housing gap 100, the intermediate fan 144, and the shaft space 66 are provided so that gas flows into the shaft space 66 as the intermediate fan 144 rotates.
  • Intermediate fan 144 blows air so that it flows into shaft space 66 .
  • a first outer forward flow Fb4, a second outer reverse flow Fc2, a first inner reverse flow Fc3, and a first shaft forward flow Fd1 are generated.
  • the first outer forward flow Fb4, the second outer backflow Fc2, and the first inner backflow Fc3 flow in the same manner as in the twenty-fourth embodiment.
  • the first shaft forward flow Fd1 flows into the shaft space 66 from the shaft upper end port 66a so as to be sucked into the intermediate fan 144, and flows into the housing gap 100 from the shaft lower end port 66b.
  • the first shaft forward flow Fd1 flows radially outward through the housing gap 100, passes through the duct passage 130, and flows out from the duct ventilation hole 123.
  • the intermediate fan 144 blows air so that the gas flows into the shaft space 66 as the first shaft forward flow Fd1.
  • the rotation of the intermediate fan 144 can promote the flow of gas and heat in the shaft space 66. Therefore, heat generated inside the motor device 60 and applied to the motor shaft 65 can be efficiently released from the shaft space 66 to the outside of the motor device 60.
  • the inverter housing 90 has the inverter through hole 95.
  • the inverter housing 90 does not have the inverter through hole 95.
  • the structure, operation, and effect not particularly described in the twenty-seventh embodiment are the same as those in the twenty-sixth embodiment.
  • the twenty-seventh embodiment will be described with a focus on points that are different from the twenty-sixth embodiment.
  • the inverter housing 90 is not provided with an inverter through hole 95, similar to the nineteenth embodiment.
  • the shaft space 66 communicates with the housing gap 100.
  • a first outward forward flow Fb4 As the intermediate fan 144 rotates, a first outward forward flow Fb4, a second outward reverse flow Fc2, and a first shaft forward flow Fd1 are generated.
  • the inverter through hole 95 is not provided in the inverter housing 90, the first internal backflow Fc3 does not occur, unlike the twenty-sixth embodiment.
  • the motor shaft 65 is provided at a position away from the inverter through hole 95 in the axial direction AD. In contrast, in the twenty-eighth embodiment, the motor shaft 65 is inserted into the inverter through hole 95. Configurations, operations, and effects not particularly described in the twenty-eighth embodiment are the same as those in the twenty-sixth embodiment. The twenty-eighth embodiment will be described with a focus on points different from the twenty-sixth embodiment.
  • the motor shaft 65 protrudes downstream from the inverter housing 90 while being inserted into the inverter through hole 95, similarly to the twentieth embodiment.
  • the motor shaft 65 is provided at a position away from the lower cover portion 182 in the axial direction AD.
  • the shaft lower end opening 66b is provided at a position aligned with the inner and lower cover hole 182b in the axial direction AD.
  • the shaft lower end port 66b is provided between the inverter outer end wall surface 94a and the lower cover portion 182 in the axial direction AD.
  • the motor shaft 65 may protrude further downstream than the lower cover portion 182.
  • the motor shaft 65 may extend downstream from the inner and lower cover holes 182b.
  • the shaft lower end opening 66b may be provided downstream of the lower cover portion 182.
  • the motor shaft 65 has a shaft midstream port 66c.
  • the shaft midstream opening 66c is an opening that opens the shaft space 66 to the outside of the motor shaft 65.
  • the shaft midstream port 66c opens the shaft space 66 radially outward.
  • the shaft midstream port 66c is provided on the shaft outer peripheral surface 65c.
  • the shaft midstream port 66c corresponds to the outer peripheral port.
  • the shaft midstream port 66c is provided between the shaft upper end port 66a and the shaft lower end port 66b in the axial direction AD.
  • the shaft midstream port 66c is formed by a hole that penetrates the outer peripheral portion of the motor shaft 65 in the radial direction RD.
  • the shaft midstream port 66c is provided in the housing gap 100.
  • the shaft midstream port 66c is provided between the motor housing 70 and the inverter housing 90 in the axial direction AD.
  • the shaft midstream opening 66c communicates the shaft space 66 and the housing gap 100.
  • At least one shaft midstream port 66c is provided in the housing gap 100.
  • a first outer forward flow Fb4, a second outer reverse flow Fc2, a first inner reverse flow Fc3, a first shaft forward flow Fd1, and a first shaft reverse flow Fd2 are generated.
  • the first outer forward flow Fb4, the second outer reverse flow Fc2, the first inner reverse flow Fc3, and the first shaft forward flow Fd1 flow in the same manner as in the twenty-sixth embodiment.
  • the first shaft downstream flow Fd1 flows into the housing gap 100 from the shaft midstream opening 66c instead of the shaft lower end opening 66b.
  • the first shaft backflow Fd2 flows into the shaft space 66 from the shaft lower end port 66b so as to be sucked into the intermediate fan 144, and flows into the housing gap 100 from the shaft midstream port 66c.
  • the first shaft reverse flow Fd2 passes through the housing gap 100 and flows out from the duct ventilation hole 123, similarly to the first shaft forward flow Fd1.
  • the shaft midstream port 66c is provided on the shaft outer peripheral surface 65c, and opens the shaft space 66 in the radial direction RD.
  • gas can flow out from the shaft space 66 between the shaft upper end surface 65a and the shaft lower end surface 65b. Therefore, in the configuration in which gas flows inside the motor shaft 65, the degree of freedom regarding the flow of gas can be increased. Therefore, the heat dissipation effect of the motor shaft 65 by the shaft space 66 can be further enhanced.
  • a hole forming a shaft midstream opening 66c is provided in the middle of the motor shaft 65. Therefore, gas can be taken in and taken out from the middle of the motor shaft 65, and a more optimal cooling path can be designed.
  • gas can be taken in and taken out from the middle of the motor shaft 65, and a more optimal cooling path can be designed.
  • the motor shaft 65 passes through the inverter device 80 as in this embodiment, it is necessary to take in and take out gas from the middle of the motor shaft 65.
  • the intermediate fan 144 since the intermediate fan 144 is provided between the motor device 60 and the inverter device 80, the operation of the intermediate fan 144 causes the gas in the motor shaft 65 to flow through the housing gap 100. .
  • ⁇ 29th embodiment> In the twenty-eighth embodiment described above, the motor housing 70 is provided upstream of the inverter housing 90. In contrast, in the twenty-ninth embodiment, the inverter housing 90 is provided upstream of the motor housing 70. Configurations, operations, and effects that are not particularly described in the twenty-ninth embodiment are the same as those in the twenty-eighth embodiment. The twenty-ninth embodiment will be described with a focus on points that are different from the twenty-eighth embodiment.
  • the inverter housing 90 is provided between the gear 53 and the motor housing 70 in the axial direction AD, similarly to the twenty-fifth embodiment.
  • the duct unit 180 has an outer circumferential duct 120, an upper cover section 181, a lower cover section 182, a duct passage 130, an upper cover passage 185, and a lower cover passage 186, as in the twenty-fifth embodiment. There is.
  • a first outer forward flow Fb4, a first inner forward flow Fb5, and a second outer reverse flow Fc2 are generated, as in the twenty-fifth embodiment.
  • a first shaft forward flow Fd1 and a first shaft reverse flow Fd2 occur, as in the twenty-eighth embodiment.
  • the first shaft forward flow Fd1 and the first shaft reverse flow Fd2 flow into the housing gap 100 from the shaft space 66 and then flow out from the duct ventilation hole 123.
  • the EPU 50 includes the intermediate fan 144.
  • the EPU 50 includes an upstream fan 143. Configurations, operations, and effects not particularly described in the 30th embodiment are the same as those in the 28th embodiment. The 30th embodiment will be described with a focus on points different from the 28th embodiment.
  • the EPU 50 has an upstream fan 143, similar to the eleventh embodiment described above.
  • the duct unit 180 has an outer duct 120, an upper cover section 181, a lower cover section 182, a duct passage 130, an upper cover passage 185, and a lower cover passage 186, as in the twenty-ninth embodiment.
  • an upper cover channel 185 is formed between the upper cover part 181 and the motor housing 70.
  • Lower cover flow path 186 is formed between lower cover portion 182 and inverter housing 90.
  • the upstream fan 143 is provided in the upper cover flow path 185.
  • Upstream fan 143 is provided between upper cover portion 181 and motor housing 70 .
  • the upstream fan 143 is provided between the gear 53 and the motor housing 70 in the axial direction AD.
  • Upstream fan 143 is fixed to motor shaft 65.
  • the upstream fan 143 can cause gas to flow in the axial direction AD in the duct flow path 130.
  • the upstream fan 143 extends radially outward from the motor outer peripheral wall surface 71a.
  • a backflow such as the second external backflow Fc2 flows as the upstream fan 143 rotates.
  • the upstream fan 143 can cause gas to flow in the radial direction RD in the upper cover flow path 185.
  • gas flows radially outward.
  • the upstream fan 143 is an axial fan, a centrifugal fan, or the like.
  • the EPU 50 has a gear gap 54 similarly to the twenty-fifth embodiment.
  • a gear gap 54 is provided between the motor housing 70 and the gear 53.
  • Motor housing 70 is adjacent to gear 53 with gear gap 54 interposed therebetween.
  • Motor housing 70 corresponds to the adjacent housing.
  • At least a portion of the upstream fan 143 is provided in the gear gap 54.
  • the motor shaft 65 has a shaft upstream opening 66d.
  • the shaft upstream opening 66d is an opening that opens the shaft space 66 to the outside of the motor shaft 65.
  • the shaft upstream port 66d opens the shaft space 66 radially outward.
  • the shaft upstream port 66d is provided on the shaft outer peripheral surface 65c.
  • the shaft upstream port 66d is formed by a hole that penetrates the outer peripheral portion of the motor shaft 65 in the radial direction RD.
  • the shaft upstream port 66d is provided in the upper cover channel 185.
  • the shaft upstream port 66d is provided between the upper cover portion 181 and the motor housing 70 in the axial direction AD.
  • the shaft upstream port 66d communicates the shaft space 66 with the upper cover channel 185.
  • At least one shaft upstream port 66d is provided in the upper cover channel 185.
  • a second outer backflow Fc2 As the upstream fan 143 rotates, a second outer backflow Fc2, a first inner backflow Fc3, and a first shaft backflow Fd2 are generated.
  • the second outer backflow Fc2, the first inner backflow Fc3, and the first shaft backflow Fd2 flow into the lower cover channel 186 from the inner and lower cover holes 182b so as to be sucked into the upstream fan 143.
  • the second outer backflow Fc2 flows into the duct flow path 130 from the lower cover flow path 186, passes through the upper cover flow path 185 in the axial direction AD, and flows out from the outer upper cover hole 181a.
  • the first internal backflow Fc3 flows into the inverter through hole 95 from the lower cover flow path 186, passes through the housing gap 100 and the duct flow path 130, and flows out from the outer upper cover hole 181a.
  • the first shaft backflow Fd2 flows into the shaft space 66 from the lower cover flow path 186 and flows in the opposite direction to the shaft space 66 in the axial direction AD.
  • the first shaft backflow Fd2 flows into the upper cover channel 185 from the shaft upstream opening 66d, and flows out from the outer upper cover hole 181a.
  • the motor housing 70 is provided upstream of the inverter housing 90.
  • the inverter housing 90 is provided upstream of the motor housing 70. Configurations, operations, and effects not particularly described in the 31st embodiment are the same as those in the 30th embodiment. The 31st embodiment will be described with a focus on the points that are different from the 28th embodiment.
  • the inverter housing 90 is provided between the gear 53 and the motor housing 70 in the axial direction AD, similarly to the twenty-ninth embodiment.
  • the duct unit 180 has an outer circumferential duct 120, an upper cover part 181, a lower cover part 182, a duct passage 130, an upper cover passage 185, and a lower cover passage 186, as in the twenty-ninth embodiment. There is.
  • a second outer backflow Fc2 As the intermediate fan 144 rotates, a second outer backflow Fc2, a first inner backflow Fc3, and a first shaft backflow Fd2 are generated, similar to the thirtieth embodiment.
  • the first inner backflow Fc3 is a backflow of the first outer backflow Fc1 that flows from the duct flow path 130 through the housing gap 100 into the inverter through hole 95.
  • the EPU 50 included the intermediate fan 144.
  • the EPU 50 includes a downstream fan 141. Configurations, operations, and effects not particularly described in the 32nd embodiment are the same as those in the 28th embodiment. The 32nd embodiment will be described with a focus on the points that are different from the 28th embodiment.
  • the EPU 50 has a downstream fan 141 similarly to the seventh embodiment.
  • the downstream fan 141 is provided in the lower cover channel 186.
  • Downstream fan 141 is provided between upper cover portion 181 and inverter housing 90.
  • the downstream fan 141 is fixed to the motor shaft 65.
  • the downstream fan 141 can cause gas to flow in the axial direction AD in the duct flow path 130.
  • the downstream fan 141 is an axial fan or a centrifugal fan.
  • a first outer forward flow Fb4 As the downstream fan 141 rotates, a first outer forward flow Fb4, a first inner forward flow Fb5, and a first shaft forward flow Fd1 are generated.
  • the first outer downstream flow Fb4, the first inner downstream flow Fb5, and the first shaft downstream flow Fd1 flow into the duct flow path 130 from the duct upstream opening 121 so as to be sucked into the downstream fan 141.
  • the first outer forward flow Fb4 passes through the duct flow path 130 and flows out from the lower outer cover hole 182a.
  • the lower outer cover hole 182a is included in the lower cover part 182.
  • the outer lower cover hole 182a passes through the lower cover portion 182 in the axial direction AD.
  • the lower outer cover hole 182a is provided at a position radially outwardly away from the motor axis Cm.
  • the outer lower cover hole 182a is provided at a position closer to the outer circumferential duct 120 in the radial direction RD.
  • the lower outer cover hole 182a is provided at a position aligned with the upper outer cover hole 181a and the duct flow path 130 in the axial direction AD.
  • the first inner forward flow Fb5 is a forward flow of the first outer forward flow Fb4 that flows from the duct flow path 130 through the housing gap 100 into the inverter through hole 95.
  • the first shaft forward flow Fd1 passes through the shaft space 66, flows into the lower cover channel 186 from the shaft lower end port 66b, and flows out from the outer lower cover hole 182a.
  • the inverter housing 90 is provided between the gear 53 and the motor housing 70 in the axial direction AD, similarly to the thirty-second embodiment. Unlike the thirty-second embodiment, the gear 53 is provided at a position away from the inverter housing 90 in the axial direction AD. A gear gap 54 is provided between the gear 53 and the inverter housing 90, as in the twenty-fifth embodiment. The gear gap 54 is covered from the outer circumferential side by the outer circumferential duct 120.
  • a first outer forward flow Fb4 As the intermediate fan 144 rotates, a first outer forward flow Fb4, a second inner forward flow Fb6, and a first shaft forward flow Fd1 are generated.
  • the second inner downstream flow Fb6 flows radially inward through the gear gap 54 so as to be sucked into the downstream fan 141, and flows into the inverter through hole 95.
  • the second internal downstream flow Fb6 flows from the inverter through hole 95 through the housing gap 100 into the duct flow path 130, and flows out from the outer lower cover hole 182a.
  • a gear gap 54 is provided as a gap between the gear 53 and the motor housing 70.
  • the gap heat dissipation parts such as the gap fins 105 may have any configuration in terms of shape, size, number, position in the housing gap 100, etc., as long as they can dissipate heat.
  • a plurality of gap fins 105 may be arranged in the radial direction RD.
  • the gap fins 105 may be provided on each of the motor inner end wall surface 73a and the inverter inner end wall surface 93a.
  • the shape, size, number, and position of the gap fins 105 in the housing gap 100 are preferably configured to enhance the heat dissipation effect in the housing gap 100.
  • the gap fins 105 may not be provided in the housing gap 100. Note that in the fourth to fourteenth embodiments described above, illustration of the gap fins 105 is omitted.
  • the hole heat dissipating portions such as the hole fins 96 may have any configuration in terms of shape, size, number, position with respect to the inverter through holes 95, etc., as long as they can dissipate heat.
  • the hole fins 96 may extend in the radial direction RD so as to span the motor axis Cm and the inverter inner peripheral wall surface 92a.
  • the shape, size, number, and position of the hole fins 96 in the inverter through hole 95 are preferably configured to enhance the heat dissipation effect of at least one of the housing gap 100 and the inverter through hole 95.
  • the hole fins 96 may not be provided in the inverter through hole 95. Note that in the fourth to fourteenth examples, the gap fins 105 are not shown.
  • the outer circumferential fins 79, 99 may have any configuration in terms of shape, size, number, position on the outer circumferential wall surfaces 71a, 91a, etc., as long as they can dissipate heat.
  • a plurality of outer circumferential fins 79, 99 may be arranged in the axial direction AD.
  • the shape, size, number, and position of the outer circumferential fins 79 and 99 on the outer circumferential wall surfaces 71a and 91a are preferably configured to enhance the heat dissipation effect on the outer circumferential side of the outer circumferential walls 71 and 91.
  • the outer circumferential fins 79, 99 may not be provided on the outer circumferential wall surfaces 71a, 91a. Note that in the third to fourteenth parts, the outer circumferential fins 79 and 99 are not shown.
  • the thickness of the housing gap 100 in the axial direction AD may or may not be uniform.
  • the housing gap 100 may be provided at a position radially outward from the motor axis Cm as long as it is open radially outward.
  • the housing gap 100 may extend annularly in the circumferential direction CD, or may be arranged in plurality in the circumferential direction CD.
  • the inverter through hole 95 may be offset from the center of the inverter housing 90 in the radial direction RD.
  • the inverter through hole 95 may be inclined in the radial direction RD with respect to the motor axis Cm.
  • the inner diameter of the inverter through hole 95 may or may not be uniform. Inverter through hole 95 may not be provided in inverter housing 90.
  • the blower fan such as the downstream fan 141 may have any configuration as long as it can blow air so that gas flows into the housing gap 100.
  • at least a portion of the blower fan may be provided in the housing gap 100.
  • the blower fan may not be connected to the motor shaft 65.
  • the blower fan may be rotated by a drive source different from the motor 61. It is sufficient that at least a portion of the blower fan is housed in the outer duct 120.
  • an upstream fan 143 may be housed in the outer duct 120 as a blower fan.
  • the outer duct 120 may have any configuration as long as it covers the housing gap 100 from the outer circumferential side so that gas flows into the housing gap 100.
  • a plurality of at least one of the duct upstream opening 121 and the duct downstream opening 122 may be arranged in the circumferential direction CD.
  • the outer duct 120 may be fixed to the gear 53 or the like as long as it is fixed to the EPU 50.
  • the cooling device 150 may have any configuration.
  • the refrigerant flow path 153 may include both the shaft heat radiation path 153b and the pump heat radiation path 153c.
  • the refrigerant flow path 153 may be provided in any part of the motor device 60.
  • the coolant flow path 153 may be embedded in the motor outer peripheral wall 71 or the motor inner end wall 73.
  • Refrigerant flow path 153 may be provided inside inverter housing 90.
  • the pump shaft 152 may be provided with a downstream fan 141 or a centrifugal downstream fan 141B as a blowing fan.
  • the motor housing 70 may be provided downstream of the inverter housing 90.
  • the upstream end surface of the motor housing 70 is the motor inner end wall surface 73a.
  • the downstream end surface of the inverter housing 90 is an inverter inner end wall surface 93a. Therefore, even if the motor housing 70 is located downstream of the inverter housing 90, there is a housing gap 100 between the motor inner end wall surface 73a and the inverter inner end wall surface 93a.
  • the motor shaft 65 only needs to have at least one opening such as the shaft upper end opening 66a.
  • the motor shaft 65 may have at least one of a shaft upper end opening 66a and a shaft lower end opening 66b.
  • the motor shaft 65 does not need to have an opening as long as it has the shaft space 66.
  • the eVTOL 10 does not need to be a tilt rotor machine. That is, in the eVTOL 10, the propeller 20 does not need to be tiltable.
  • the plurality of propellers 20 may include a lift propeller 20 and a cruise propeller 20, respectively. In this eVTOL 10, for example, the lift propeller 20 is driven when the vehicle is going up, and the cruise propeller 20 is driven when the vehicle is moving forward.
  • the aircraft on which the propulsion device 15 is mounted does not have to be a vertical takeoff and landing aircraft.
  • the aircraft may be a rotary wing aircraft or a fixed wing aircraft.
  • the flying object may be an unmanned aircraft without a person on board.
  • a propulsion device for propelling a flying object (10), a motor device (60) having a motor (61) driven to propel the flying object, and a motor housing (70) housing the motor; It has an inverter (81) that converts electric power supplied to the motor, and an inverter housing (90) that houses the inverter, and the inverter housing and the motor housing are connected to the rotation axis (Cm) of the motor.
  • a propulsion device equipped with is
  • the housing gap extends in the radial direction so as to span the rotation axis and at least one of the outer circumferential surface (71a) of the motor housing and the outer circumferential surface (91a) of the inverter housing. 1.
  • the propulsion device according to 1.
  • blower fan includes a hole fan (141A, 141B) provided in the inverter through hole.
  • Technical thought 9 Technical idea 1 comprising a downstream fan (141, 141A, 141B) that blows air in a direction in which the inverter housing is downstream of the motor housing in the axial direction and is provided downstream of the housing gap.
  • the propulsion device according to any one of 8 to 8.
  • the motor housing and the inverter housing are covered from the outside in the radial direction, and a duct flow path (130) is formed between the outer circumferential surface (71a) of the motor housing and the outer circumferential surface (91a) of the inverter housing.
  • a peripheral duct (120) The propulsion device according to technical idea 9, wherein the downstream fan is provided in the duct flow path and blows air so as to suck out gas from the duct flow path and the housing gap.
  • Technical thought 12 a conductive member (55) that extends between the motor housing and the inverter housing through the housing gap and connects the motor and the inverter in a conductive manner; a spacer (101, 105d) provided between the motor housing and the inverter housing to protect the conductive member and forming the housing gap;
  • the propulsion device according to any one of technical ideas 1 to 11, comprising:
  • the cooling device includes: a refrigerant flow path (153) through which the refrigerant flows; a refrigerant pump (151) that is provided outside the motor device and the inverter device and flows the refrigerant into the refrigerant flow path; The refrigerant pump is connected to a motor shaft (65) of the motor in a state that forms at least a part of the refrigerant flow path and extends externally from the motor device, and the refrigerant pump is driven as the motor is driven.
  • a pump shaft (152) that causes It has The propulsion device according to Technical Idea 13 or 14, wherein in the refrigerant flow path, heat of the refrigerant is released to the outside through at least one of the refrigerant pump and the pump shaft.
  • the motor shaft (65) of the motor is The propulsion device according to technical idea 18 or 19, further comprising an outer circumferential opening (66c) provided on the outer circumferential surface (65c) of the motor shaft and opening the shaft space in the radial direction.
  • the propulsion device according to any one of technical ideas 1 to 20, further comprising a gap fan (144) that is provided in the housing gap and blows air so that gas flows through the housing gap.
  • the motor shaft (65) of the motor is a shaft space (66) as an internal space open to the outside of the motor shaft and extending in the axial direction; It has The propulsion device according to Technical Idea 21, wherein the gap fan blows air so that gas flows into the shaft space.
  • the gap fan is The motor air flow (Fb4; Fc1, Fc2), which is a gas flow, flows in the axial direction along the outer peripheral surface (71a) of the motor housing, and the inverter air flow (Fc2; Fb4), which is a gas flow, flows in the axial direction along the outer peripheral surface (71a) of the motor housing.
  • a gear device (53) that is arranged in the axial direction on the motor housing and the inverter housing so as to be adjacent to one of the motor housing and the inverter housing, and that changes and outputs the rotation speed of the motor;
  • a gear gap (a gap opened outward in the radial direction) provided between an adjacent housing (70, 90) adjacent to the gear device among the motor housing and the inverter housing and the gear device; 54,185) and
  • the propulsion device according to any one of Technical Ideas 1 to 23, comprising:

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Abstract

La présente invention concerne un dispositif de propulsion (15) qui comprend une hélice (20) et une unité de propulsion électronique (EPU) (50). L'EPU (50) comprend un dispositif moteur (60) et un dispositif onduleur (80). Le dispositif moteur (60) comprend un moteur (61) et un carter de moteur (70). Le dispositif onduleur (80) comprend un onduleur (81) et un boîtier d'onduleur (90). Le carter de moteur (70) et le boîtier d'onduleur (90) sont alignés dans une direction axiale (AD) le long d'un axe de moteur (Cm). Un espace de boîtier (100) est formé entre le carter de moteur (70) et le boîtier d'onduleur (90). L'espace de boîtier (100) est ouvert en regard radialement vers l'extérieur par une ouverture d'espace (100a). L'ouverture d'espace (100a) s'étend en forme d'anneau dans une direction circonférentielle (CD).
PCT/JP2023/017911 2022-06-28 2023-05-12 Dispositif de propulsion WO2024004402A1 (fr)

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JP2022-103867 2022-06-28
JP2022103867 2022-06-28
JP2023014093A JP2024004442A (ja) 2022-06-28 2023-02-01 推進装置
JP2023-014093 2023-02-01

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