Drive device and drive device unit

Abstract

In a motor housing (70), motor fins (72) are provided on a motor outer peripheral surface (70a). In an inverter case (90), inverter fins (92) are provided on an inverter outer peripheral surface (90a). The fin cover (140) covers the motor fins (72) and the inverter fins (92) from the outside in the radial direction. A cover flow path (160) is formed between the fin cover (140) and the motor outer peripheral surface (70a) and the inverter outer peripheral surface (90a). The cover flow path (160) has a first flow path (161) provided with a motor fin (72) and a second flow path (171) provided with an inverter fin (92). In the second flow path (171), a second air flow (Fa2) flowing into the second inlet (172) reaches the inverter fins (92) without passing through the first flow path (161).

Description

Citation of related applications

[0001] This application is based on patent application No. 2022-075079 filed in Japan on April 28, 2022, and the contents of the basic application are cited as a reference in their entirety. Technical Field

[0002] The disclosure of this specification relates to a drive device and a drive device unit. Background Art

[0003] Patent document 1 discloses an electronic module installed in an aircraft. The electronic module is a driving device for driving a propulsion device installed in the aircraft. The electronic module includes an inverter and a housing. The housing has a cylindrical portion and heat dissipation fins. The cylindrical portion extends in the axial direction and accommodates the inverter. The heat dissipation fins are arranged on the outer surface of the cylindrical portion. A plurality of heat dissipation fins are arranged in the axial direction. Prior art literature Patent Literature

[0004] Patent document 1: FR3091063 Summary of the invention

[0005] In the above-mentioned Patent Document 1, in the electronic module, when a gas such as air flows in the axial direction as a cooling airflow, the heat dissipation effect of the heat dissipation fins is likely to be increased by the cooling airflow. However, in the above-mentioned Patent Document 1, a plurality of heat dissipation fins are arranged in the axial direction. Therefore, the heat dissipation fins on the downstream side perform heat exchange with the cooling airflow whose temperature rises due to heat exchange with the heat dissipation fins on the upstream side. Therefore, the heat dissipation effect achieved by the cooling air is likely to be lower for the heat dissipation fins on the downstream side than for the heat dissipation fins on the upstream side.

[0006] The main purpose of the present disclosure is to provide a driving device and a driving device unit capable of improving heat dissipation effect.

[0007] The various methods disclosed in this specification use different technical means to achieve each purpose. In addition, the claims and the symbols in parentheses described therein are examples of the correspondence relationship with the specific elements described in the embodiments described later as one mode, and do not limit the technical scope.

[0008] In order to achieve the above object, the disclosed method is a driving device, The driving device is used to drive the rotor of the flying object to rotate, and the driving device comprises: a heat generating portion that generates heat due to a drive for rotating the rotor; a housing having an outer peripheral surface extending along a rotation axis of a fan for flowing gas and accommodating a heat generating portion; an upstream fin, the upstream fin being disposed on the outer peripheral surface and releasing heat from the heat generating portion to the gas; a downstream fin, the downstream fin being provided on the outer peripheral surface at a position more downstream than the upstream fin in the gas flow in the axial direction relative to the rotation axis and releasing heat from the heat generating portion to the gas; an outer shell cover, the outer shell cover covering the outer peripheral surface to form a first flow path provided with upstream fins and a second flow path provided with downstream fins between the outer shell cover and the outer peripheral surface, so that gas flows through the first flow path and the second flow path; and a first inlet included in the first flow path and allowing gas to flow from the outside of the outer housing into the first flow path without passing through the second flow path; and The second inlet is included in the second flow path and allows gas to flow from the outside of the outer housing into the second flow path without passing through the first flow path.

[0009] According to the above method, the second inlet allows the gas outside the outer cover to flow into the second flow path without passing through the first flow path. In this structure, the gas that does not absorb the heat of the upstream fin flows into the second flow path from the second inlet. Therefore, for the gas flowing into the second flow path, it is possible to avoid the ability to absorb the heat of the downstream fin in the second flow path being reduced due to the heat of the upstream fin having been absorbed in the first flow path. Therefore, by not passing through the first flow path, the heat dissipation effect of the downstream fin in the second flow path can be improved. Thus, the heat dissipation effect of the drive device can be improved.

[0010] One disclosed method is a drive device unit, The driving device unit is installed on the flying object, and the driving device unit comprises: A driving device, the driving device is used to drive the rotor of the flying body to rotate; and a fan, wherein the fan rotates around a rotation axis to convey gas, and is arranged along the rotation axis with the driving device, The drive unit includes: a heat generating portion that generates heat due to a drive for rotating the rotor; A housing having an outer peripheral surface extending along the rotation axis and accommodating the heating portion; an upstream fin, the upstream fin being disposed on the outer peripheral surface and releasing heat from the heat generating portion to the gas; a downstream fin, the downstream fin being provided on the outer peripheral surface at a position more downstream than the upstream fin in the gas flow in the axial direction relative to the rotation axis and releasing heat from the heat generating portion to the gas; an outer shell cover that covers the outer peripheral surface to form a first flow path provided with upstream fins and a second flow path provided with downstream fins between the outer shell cover and the outer peripheral surface, and allows gas to flow through the first flow path and the second flow path; and a first inlet included in the first flow path and allowing gas to flow from the outside of the outer housing into the first flow path without passing through the second flow path; and The second inlet is included in the second flow path and allows gas to flow from the outside of the outer housing into the second flow path without passing through the first flow path.

[0011] According to the above-mentioned drive device unit, the same effect as the above-mentioned drive device can be achieved. Therefore, the heat dissipation effect of the drive device unit can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a diagram showing the structure of the eVTOL in the first embodiment. Figure 2 is a block diagram showing the electrical structure of the EDS in the eVTOL. Figure 3 It is a stereoscopic view of the rotor and EDS unit. Figure 4 It is a stereogram of EDS. Figure 5 It is a three-dimensional picture of EDS and fin cover. Figure 6 It is a longitudinal section view of the EDS and the fin cover. Figure 7 It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Figure 8 yes Figure 7 It is a cross-sectional view along the line VIII-VIII and a transverse cross-sectional view of the motor and the fin cover. Fig. 9 yes Figure 7 The IX-IX line sectional view is a cross-sectional view of the inverter and the fin cover. Fig.10 This is a diagram in which the outer peripheral surface of the EDS and the fin cover are partially developed. Fig.11 It is a cross-sectional view of the electric motor and the fin cover according to the second embodiment. Fig.12 This is a diagram in which the outer peripheral surface of the EDS and the fin cover are partially developed. Fig.13 It is a perspective view of the EDS and the fin cover in the third embodiment. Fig.14 It is a longitudinal section view of the EDS and the fin cover. Fig.15It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Fig.16 It is a perspective view of the EDS and the fin cover in the fourth embodiment. Fig.17 It is a longitudinal section view of the EDS and the fin cover. Fig.18 It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Fig.19 It is a longitudinal cross-sectional view of the EDS and the fin cover around the second outflow port. Fig. 20 It is a perspective view of the EDS and the fin cover in the fifth embodiment. Fig.21 It is a longitudinal section view of the EDS and the fin cover. Fig. 22 It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Fig.23 It is a perspective view of the EDS and the fin cover in the sixth embodiment. Fig.24 It is a longitudinal section view of the EDS and the fin cover. Fig.25 It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Fig.26 It is a perspective view of the EDS and the fin cover in the seventh embodiment. Fig. 27 It is a longitudinal section view of the EDS and the fin cover. Fig.28 It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Fig.29 It is a longitudinal sectional view of the EDS and the fin cover in the eighth embodiment. Fig.30 It is a longitudinal cross-sectional view of the EDS and fin cover around the first outflow port. Fig.31 It is a perspective view of the EDS and the fin cover in the ninth embodiment. Fig.32 It is a longitudinal section view of the EDS and the fin cover. Fig.33 It is a longitudinal cross-sectional view of the EDS and fin cover around the second inlet. Fig.34 It is a perspective view of the EDS and the fin cover in the tenth embodiment. Fig.35 It is a longitudinal cross-sectional view of the EDS and fin cover around the second inlet. Fig.36 It is a perspective view of the EDS and the fin cover in the eleventh embodiment. Fig.37 This is a diagram in which the outer peripheral surface of the EDS and the fin cover are partially developed. Fig.38 This is a diagram in which the outer peripheral surface of the EDS is partially developed. Fig.39 It is a perspective view of the EDS and the fin cover in the twelfth embodiment. Fig.40 This is a diagram in which the outer peripheral surface of the EDS and the fin cover are partially developed. Fig.41 This is a diagram in which the outer peripheral surface of the EDS is partially developed. Fig.42 It is a perspective view of the EDS and the fin cover in the thirteenth embodiment. Fig.43 This is a diagram in which the outer peripheral surface of the EDS and the fin cover are partially developed. Fig.44 This is a diagram in which the outer peripheral surface of the EDS is partially developed. DETAILED DESCRIPTION

[0013] Hereinafter, with reference to the accompanying drawings, a plurality of methods for implementing the present disclosure will be described. In each method, sometimes the same reference numerals are marked on the parts corresponding to the matters described in the previous method, and repeated descriptions are omitted. In the case where only a part of the structure is described in each method, other methods previously described can be applied to the other parts of the structure. Not only are the combinations of the parts that can be combined specifically and clearly recorded in each embodiment, but as long as there is no obstacle to the combination, the embodiments can also be partially combined even if not clearly recorded.

[0014] <First embodiment> Figure 1 The drive system 30 shown is installed in the eVTOL 10. The eVTOL 10 is an electric vertical take-off and landing aircraft that can take off and land vertically. eVTOL is the abbreviation of electric Vertical Take-Off and Landing aircraft. The eVTOL 10 is an aircraft that flies in the atmosphere, which is equivalent to a flying object. The eVTOL 10 is also an electric aircraft, sometimes called an electric aircraft. The eVTOL 10 is a manned aircraft with passengers on board. The drive system 30 is a system for driving the eVTOL 10 to fly.

[0015] The eVTOL 10 has a fuselage 11 and rotors 20. The fuselage 11 has a fuselage main body 12 and wings 13. The fuselage main body 12 is the body of the fuselage 11 and is, for example, in a shape extending in the front-rear direction. The fuselage main body 12 has a passenger compartment for passengers to ride in. The wings 13 extend from the fuselage main body 12, and a plurality of wings 13 are provided on the fuselage main body 12. The wings 13 are fixed wings. The plurality of wings 13 include main wings, tail wings, and the like.

[0016] Figure 1 , Figure 3 As shown, a plurality of rotors 20 are provided on the fuselage 11. The rotors 20 are respectively provided on the fuselage main body 12 and the wings 13. The rotors 20 rotate about a rotor axis. The rotor axis coincides with the rotation axis Cm described later. The rotors 20 rotate about the rotation axis Cm.

[0017] The rotor 20 has blades 21, a rotor head 22, and a rotor shaft 23. A plurality of blades 21 are arranged in the circumferential direction of the rotor axis. The rotor head 22 connects the plurality of blades 21. The blades 21 extend radially from the rotor head 22 along the rotor axis. The blades 21 are blades that rotate together with the rotor shaft 23. The rotor shaft 23 is the rotation shaft of the rotor 20 and extends along the rotor axis from the rotor head 22. The rotor axis is, for example, the center line of the rotor shaft 23.

[0018] The eVTOL 10 is a tilt-rotor aircraft (Japanese: チルトロータ機). In the eVTOL 10, the rotors 20 can be tilted. That is, the pitch angle of the rotors 20 can be adjusted. For example, when the eVTOL 10 ascends, the orientation of the rotors 20 is set such that the rotor axis extends in the up-down direction. In this case, the rotors 20 function as lift-generating rotors for causing the eVTOL 10 to generate lift. That is, the rotors 20 can function as rotary wings. When the eVTOL 10 moves forward, the orientation of the rotors 20 is set such that the rotor axis extends in the front-rear direction. In this case, the rotors 20 function as cruise rotors for causing the eVTOL 10 to generate thrust.

[0019] In the eVTOL 10, the wings 13 can be tilted relative to the fuselage main body 12. That is, the rotors 20 can be tilted for each wing 13. In the eVTOL 10, the pitch angle of the rotors 20 is adjusted by adjusting the tilt angle of the wings 13 relative to the fuselage main body 12. In addition, in the eVTOL 10, the rotors 20 can also be tilted relative to the fuselage 11. For example, the pitch angle of the rotors 20 can also be adjusted by adjusting the relative tilt angle of the rotors 20 relative to the wings 13.

[0020] As Figure 1 , Figure 2As shown, the drive system 30 has a battery 31, a distributor 32, a converter 33, a communication device 34, a storage device 35, a flight control device 40, and an EDS 50. Figure 2 In the figure, the rotor 20 is shown as a rotating member, the battery 31 is shown as a battery, the distributor 32 is shown as a distributor, and the converter 33 is shown as a DC-DC converter. In addition, the communication device 34 is shown as a communication device, the storage device 35 is shown as a storage device, and the flight control device 40 is shown as a flight control device.

[0021] The battery 31 is electrically connected to a plurality of EDSs 50. The battery 31 is a power supply unit that supplies power to the EDS 50, and is equivalent to a power supply unit. The battery 31 is a DC voltage source that applies a DC voltage to the EDS 50. The battery 31 has a secondary battery that can be charged and discharged. As the secondary battery, there are lithium-ion batteries, nickel-hydrogen batteries, etc. In addition, as a power supply unit, in addition to or instead of the battery 31, a fuel cell or a generator may be used.

[0022] The distributor 32 is electrically connected to the battery 31 and the plurality of EDSs 50. The distributor 32 distributes the power from the battery 31 to the plurality of EDSs 50. In the EDS 50, a drive unit 81 described later is electrically connected to the distributor 32. The power of the battery 31 is supplied to the drive unit 81 via the distributor 32. If the voltage of the battery 31 is referred to as a high voltage, the high voltage is applied to the drive unit 81. In addition, if the power of the battery 31 is supplied to the plurality of EDSs 50, the distributor 32 may not be required. As a structure in which the distributor 32 may not be required, for example, there is a structure in which a power supply unit is separately provided in each of the plurality of EDSs 50.

[0023] The flight control device 40 is, for example, an ECU, which controls the driving of the EDS 50. ECU is the abbreviation of Electronic Control Unit. The flight control device 40 is, for example, mainly composed of a microcomputer including a processor, a memory, an I / O, and a bus connecting them. A microcomputer is sometimes called a microcomputer. The memory is a non-transitory physical recording medium that non-temporarily stores programs and data that can be read by a computer. In addition, the non-transitory physical recording medium is a non-transitory tangible storage medium (non-transitory tangible storage medium), which is implemented by a semiconductor memory or a magnetic disk, etc.

[0024] The flight control device 40 is electrically connected to the storage device 35 and the EDS 50. The flight control device 40 executes various processes related to the drive of the EDS 50 by executing a control program stored in at least one of the memory and the storage device 35. The flight control device 40 performs flight control for flying the eVTOL 10. The flight control includes control of the EDS 50, pitch angle control for changing the pitch angle of the rotor 20, and the like. In the EDS 50, a drive control unit 54 described later is electrically connected to the flight control device 40. The flight control device 40 controls the EDS 50 by outputting a control signal to the drive control unit 54.

[0025] The converter 33 is electrically connected to the battery 31, the flight control device 40, and the EDS 50. In the EDS 50, the drive control unit 54 is electrically connected to the converter 33. The converter 33 steps down or steps up the voltage of the electric power from the battery 31, and supplies it to the flight control device 40 and the drive control unit 54. If the voltage of the electric power stepped down by the converter 33 is called a low voltage, a low voltage is applied to the flight control device 40 and the drive control unit 54. This low voltage is a voltage lower than the voltage of the battery 31. On the contrary, if the voltage of the electric power stepped up by the converter 33 is called a high voltage, a high voltage is applied to the flight control device 40 and the drive control unit 54. This high voltage is a voltage higher than the voltage of the battery 31.

[0026] EDS 50 is a device for driving the rotor 20 to rotate, which is equivalent to a drive device. EDS 50 drives the rotor 20 to rotate. EDS 50 is the abbreviation of Electric Drive System. EDS 50 is sometimes called an electric drive unit and EPU. EPU is the abbreviation of Electric Propulsion Unit. EDS 50 is provided separately for each of the plurality of rotors 20. EDS 50 is arranged on the rotor 20 along the rotor axis. A plurality of EDS 50 are fixed to the fuselage 11. EDS 50 supports the rotor 20 in a rotatable manner. EDS 50 is mechanically connected to the rotor shaft 23. The plurality of EDS 50 includes at least one of an EDS 50 fixed to the fuselage 11 in a state of extending to the outside of the fuselage 11 and an EDS 50 fixed to the fuselage 11 in a state of being buried inside the fuselage 11.

[0027] The rotor 20 is fixed to the fuselage 11 via the EDS 50. The EDS 50 does not tilt relative to the rotor 20. The EDS 50 can tilt relative to the fuselage 11 together with the rotor 20. When the pitch angle of the rotor 20 is adjusted, the direction of the EDS 50 is set together with the rotor 20.

[0028] like Figure 2As shown in FIG. 5 , the EDS 50 includes a gear box 53, a drive control unit 54, a rotation sensor 55, a motor 61, and a drive unit 81. Figure 2 In the figure, the gear box 53 is shown as a gear box, the drive unit 81 is shown as a drive unit, the drive control unit 54 is shown as a drive control unit, the rotation sensor 55 is shown as a rotation sensor, and the motor 61 is shown as a motor.

[0029] The motor 61 is a multi-phase AC motor, for example, a three-phase AC rotating electric machine. The motor 61 functions as a flight drive source, that is, an electric motor, of the eVTOL 10. The motor 61 includes a rotor and a stator 63 (see Figure 6 ). The stator 63 is a fixed part. The rotor is a rotating part that rotates relative to the stator 63. The motor 61 is electrically connected to the driving unit 81. Electric power is supplied to the motor 61 from the battery 31 via the driving unit 81. The motor 61 is driven according to the voltage and current supplied from the driving unit 81. As the motor 61, for example, a brushless motor is used. In addition, as the motor 61, an induction motor or a reactor motor may also be used.

[0030] The gear box 53 mechanically connects the motor 61 to the rotor 20. For example, the rotor shaft 23 is mechanically connected to the rotating shaft of the motor 61 via the gear box 53. The gear box 53 reduces the speed of the motor 61 and transmits it to the rotor 20. The gear box 53 is configured to include a plurality of gears and is sometimes referred to as a speed change gear and a speed reducer. The gear box 53 has a structure that matches the motor characteristics of the motor 61.

[0031] The drive unit 81 drives the motor 61 by converting the power supplied to the motor 61. The drive unit 81 has an inverter. The inverter converts the power supplied to the motor 61 from direct current to alternating current. The inverter is a power conversion unit that converts power. The inverter is a multi-phase inverter that performs power conversion for multiple phases respectively. The inverter is, for example, a three-phase inverter. The inverter is an inverter circuit composed of multiple switching elements. As the switching element, there are power elements such as IGBT and MOSFET. IGBT is the abbreviation of Insulated Gate Bipolar Transistor. MOSFET is the abbreviation of Metal-Oxide-Semiconductor Field-Effect Transistor. Switching elements are sometimes referred to as drive elements.

[0032] In the inverter, the switching elements are connected in parallel in each of the plurality of phases. For example, in a structure where the motor 61 is a three-phase AC motor, the plurality of switching elements are connected in parallel to the motor 61 in each of the U phase, the V phase, and the W phase. In addition, the plurality of switching elements may not be connected in parallel in each of the plurality of phases. For example, the plurality of switching elements may not be connected in parallel to the motor 61 in each of the U phase, the V phase, and the W phase.

[0033] The rotation sensor 55 is provided for the motor 61. The rotation sensor 55 is a rotation detection unit that detects the rotation speed and rotation angle of the motor 61. The rotation sensor 55 outputs a detection signal corresponding to the rotation speed of the motor 61 to the drive control unit 54. The rotation sensor 55 is configured to include, for example, an encoder, a resolver, and the like.

[0034] The drive control unit 54 is, for example, an ECU, and controls the drive unit 81. The drive control unit 54, like the flight control device 40, is mainly composed of, for example, a microcomputer including a processor, a memory, an I / O, and a bus connecting them.

[0035] The drive control unit 54 is electrically connected to the flight control device 40 and the drive unit 81. The drive control unit 54 is electrically connected to various sensors including the rotation sensor 55. The drive control unit 54 controls the drive unit 81 by outputting a command signal to the drive unit 81. The drive control unit 54 generates the command signal based on the control signal input from the flight control device 40 and the detection signal input from various sensors such as the rotation sensor 55. In the drive unit 81, the inverter is driven according to the command signal input from the drive control unit 54, and the power conversion of the inverter is performed.

[0036] As various sensors, there are current sensors, voltage sensors, etc. in addition to the rotation sensor 55. The current sensor detects the current flowing through the motor 61 for each of the plurality of phases, for example. The voltage sensor detects the voltage output from the battery 31, for example.

[0037] like Figure 3 As shown, the rotor 20 and the EDS 50 are arranged along the rotation axis Cm. The rotor 20 generates thrust and lift for the eVTOL 10 by rotating. The rotor 20 delivers air toward the EDS 50 side by rotating. When the rotor 20 rotates, the air flows along the rotor axis.

[0038] like Figure 3 , Figure 4As shown, the EDS 50 has a motor device 60, an inverter device 80 and a fin cover 140. The EDS 50 has, for example, a motor device 60 and an inverter device 80. The motor device 60 has a motor 61 and a motor housing 70. The motor housing 70 accommodates the motor 61. The motor 61 has a motor shaft 62. The motor shaft 62 is the rotating shaft of the motor 61 and rotates together with the rotating member. If the rotation of the rotating member is referred to as the rotation of the motor 61, the motor 61 rotates around the rotation axis Cm. The rotation axis Cm is an imaginary line extending in a straight line and coincides with the center line of the motor 61. The rotation axis Cm is sometimes referred to as the motor axis. The motor shaft 62 extends along the rotation axis Cm.

[0039] When the direction in which the rotation axis Cm extends is referred to as the axial direction AD, the axial direction AD, the radial direction RD, and the circumferential direction CD are orthogonal to each other with respect to the rotation axis Cm. In addition, with respect to the radial direction RD, the outer side of the radial direction RD is sometimes referred to as the radial outer side, and the inner side of the radial direction RD is sometimes referred to as the radial inner side.

[0040] The inverter device 80 includes a drive unit 81 and an inverter housing 90. The inverter housing 90 accommodates the drive unit 81. The motor device 60 and the inverter device 80 are arranged along the rotation axis Cm.

[0041] The motor housing 70 and the inverter housing 90 are arranged along the rotation axis Cm. The motor housing 70 and the inverter housing 90 are formed in a cylindrical shape as a whole and extend along the rotation axis Cm. The motor housing 70 and the inverter housing 90 are in a state of overlapping each other in the axial direction AD. The motor housing 70 and the inverter housing 90 are fixed to each other by fixing members such as bolts. The motor housing 70 and the inverter housing 90 are formed of a metal material or the like and have thermal conductivity.

[0042] The motor housing 70 and the inverter housing 90 constitute the housing of the EDS 50. The motor 61 and the drive unit 81 are used to drive the rotor 20 to rotate, and heat is easily generated by the drive. The motor 61 and the drive unit 81 are equivalent to the heat generating body, and the motor housing 70 and the inverter housing 90 are equivalent to the housing.

[0043] The fin cover 140 accommodates the motor housing 70 and the inverter housing 90. The fin cover 140 is formed in a cylindrical shape as a whole and extends along the rotation axis Cm. The fin cover 140 is in a state of crossing the motor housing 70 and the inverter housing 90 in the axial direction AD. The fin cover 140 is in a state of covering the motor housing 70 and the inverter housing 90 from the outer peripheral side. The fin cover 140 is arranged outside the motor housing 70 and the inverter housing 90 in the radial direction RD.

[0044] The fin cover 140 is formed of a resin material or the like and is elastically deformable. The fin cover 140 is mounted on the motor housing 70 and the inverter housing 90 in an elastically deformed state. The fin cover 140 extends at least radially outward by elastic deformation, and is in a state where the position relative to the motor housing 70 and the inverter housing 90 is maintained by a restoring force toward the radial inside. In this way, the fin cover 140 is mounted on the motor housing 70 and the inverter housing 90 using the restoring force caused by the elastic deformation. The fin cover 140 is equivalent to a housing cover. The thermal conductivity of the fin cover 140 is lower than that of the motor housing 70 and the inverter housing 90.

[0045] The EDS 50 is equipped with an air supply device 110. The air supply device 110 is installed on the EDS 50, and together with the EDS 50, constitutes an EDS unit 130. The EDS unit 130 is installed in the eVTOL 10. The air supply device 110 is arranged along the rotation axis Cm relative to the rotor 20 and the EDS 50. The air supply device 110 is provided between the rotor 20 and the EDS 50 in the axial direction AD. The EDS unit 130 is equivalent to a drive device unit.

[0046] The air supply device 110 delivers air by driving. The air supply device 110 includes an air supply fan 111 and a shroud 120. The air supply fan 111 rotates around the rotation axis Cm. The center line of the air supply fan 111 coincides with the rotation axis Cm. The air supply fan 111 delivers air toward the EDS 50 in the axial direction AD by rotating. The air supply fan 111 delivers cooling air for cooling the EDS 50 toward the EDS 50. In the present embodiment, the air supply fan 111 side is the upstream side with respect to the EDS 50.

[0047] The air supply fan 111 has fan blades 112 and a fan shaft 113. A plurality of fan blades 112 are arranged in the circumferential direction CD. The fan blades 112 are connected by a fan head. The fan blades 112 extend from the fan head in the radial direction RD. The fan blades 112 are blades that rotate together with the fan shaft 113. The fan shaft 113 is the rotation axis of the air supply fan 111, and extends from the fan head along the rotation axis Cm.

[0048] The shroud 120 accommodates the air supply fan 111. The shroud 120 is formed in a cylindrical shape and extends along the rotation axis Cm. The shroud 120 is provided outside the air supply fan 111 in the radial direction RD. The shroud 120 is mounted on the EDS 50. The shroud 120 is fixed to the motor housing 70, for example. The shroud 120 is formed of a resin material or the like. The thermal conductivity of the shroud 120 is lower than that of the motor housing 70 and the inverter housing 90.

[0049] The motor shaft 62 is connected to the rotor 20 and the air supply fan 111. For example, the rotor shaft 23 and the fan shaft 113 are connected to the motor shaft 62. When the motor 61 is driven, the rotor 20 and the air supply fan 111 rotate together with the motor shaft 62. As described above, the motor shaft 62 is connected to the rotor 20 via the gear box 53, but Figure 3 , Figure 4 The gear box 53 is omitted in the figure. In addition, the motor shaft 62 may be connected to the rotor 20 without passing through the gear box 53. In addition, the motor shaft 62 may be integrated with the fan shaft 113.

[0050] like Figure 4 , Figure 6 As shown, the motor housing 70 has a motor outer peripheral surface 70a, a motor inner peripheral surface 70b and a motor end surface 70c. The motor outer peripheral surface 70a and the motor inner peripheral surface 70b extend along the rotation axis Cm and in the axial direction AD. The motor outer peripheral surface 70a and the motor inner peripheral surface 70b extend in a ring shape along the circumferential direction CD. The motor outer peripheral surface 70a is the outer peripheral surface of the motor housing 70. The motor inner peripheral surface 70b is the inner peripheral surface of the motor housing 70. The motor end surface 70c is the end surface of the motor housing 70, and a pair of motor end surfaces are arranged in the axial direction AD. The motor end surface 70c extends in a direction orthogonal to the axial direction AD. The motor outer peripheral surface 70a includes an outer peripheral upstream end 70a1 and an outer peripheral downstream end 70a2. The outer peripheral upstream end 70a1 is the upstream end of the motor outer peripheral surface 70a, and extends along the outer peripheral edge of the motor end surface 70c. The outer peripheral downstream end 70a2 is the downstream end of the motor outer peripheral surface 70a.

[0051] like Figure 4 , Figure 5 As shown, the motor housing 70 has a motor peripheral wall 71, a motor fin 72 and a flange 75. The motor peripheral wall 71 is formed in a cylindrical shape as a whole and extends along the rotation axis Cm. The motor peripheral wall 71 extends in a ring shape along the circumferential direction CD. The motor peripheral wall 71 is formed in a cylindrical shape as a whole. The motor peripheral wall 71 is the outer peripheral wall of the motor housing 70. The motor peripheral wall 71 is sometimes referred to as a housing body. The inner space of the motor peripheral wall 71 forms the internal space of the motor housing 70. The motor peripheral wall 71 forms a motor outer peripheral surface 70a and a motor inner peripheral surface 70b.

[0052] The motor fins 72 are fins provided on the motor outer peripheral surface 70a. The motor fins 72 can release the heat of the motor device 60 to the outside and are heat dissipation fins. The motor fins 72 increase the surface area of ​​the motor housing 70 to improve the heat dissipation effect from the motor housing 70.

[0053] The motor fin 72 protrudes from the motor outer peripheral surface 70a. The motor fin 72 is integrally provided on the motor outer peripheral wall 71. The motor fin 72 is formed in a plate shape. The motor fin 72 extends in a direction orthogonal to the circumferential direction CD. The motor fin 72 has a pair of plate surfaces arranged along the circumferential direction CD. A plurality of motor fins 72 are arranged in the circumferential direction CD along the motor outer peripheral surface 70a. The plurality of motor fins 72 extend parallel to each other. The motor fin 72 is provided near the center of the motor outer peripheral surface 70a in the axial direction AD. The motor fin 72 is located on the motor outer peripheral surface 70a at a position separated from both the outer peripheral upstream end 70a1 and the outer peripheral downstream end 70a2.

[0054] like Figure 8 As shown, the motor device 60 has a motor fin group 73. The motor fin group 73 has a plurality of motor fins 72. In the motor fin group 73, a plurality of motor fins 72 are densely arranged in the circumferential direction CD. A plurality of motor fin groups 73 are arranged in the circumferential direction CD along the motor outer peripheral surface 70a. The motor fin group 73 is contained in the motor housing 70.

[0055] like Figure 4 , Figure 5 As shown, the flange 75 is a protrusion provided on the outer peripheral surface 70a of the motor. The flange 75 is a portion for fixing the air supply device 110. A plurality of flanges 75 are arranged in the circumferential direction CD. For example, the flange 75 is provided between two motor fin groups 73 adjacent to each other in the circumferential direction CD. The flange 75 is fixed with a fixing member such as a bolt to the shield 120 and the like. In addition, the air supply device 110 is a fixing object fixed to the motor device 60. As a fixing object, in addition to the air supply device 110, there is also a gear box 53 and the like.

[0056] like Figure 6 , Figure 8 As shown, the stator 63 is accommodated in the motor housing 70. The stator 63 has a coil and an iron core, etc. The stator 63 is easy to generate heat as the motor 61 is driven. In the stator 63, the coil generates heat, for example, as the coil is energized. The stator 63 generates heat by the drive for rotating the rotor 20. The stator 63 is equivalent to a heating part. The stator 63 is arranged on the inner circumferential surface 70b of the motor. The stator 63 is fixed to the inner circumferential surface 70b of the motor by molded resin and bolts, etc. The stator 63 extends annularly in the circumferential direction CD along the inner circumferential surface 70b of the motor. For example, in the stator 63, a plurality of coils are arranged in the circumferential direction CD along the inner circumferential surface 70b of the motor.

[0057] The stator 63 and the motor fin 72 are arranged in the radial direction RD. The stator 63 is arranged at a position where heat is easily transferred to the motor fin 72 via the motor outer peripheral wall 71. The stator 63 is arranged between the outer peripheral upstream end 70a1 and the outer peripheral downstream end 70a2. The stator 63 is located at a position separated from both the outer peripheral upstream end 70a1 and the outer peripheral downstream end 70a2, similarly to the motor fin 72. In addition, at least a part of the stator 63 may be arranged at a position parallel to the motor fin 72 in the radial direction RD.

[0058] like Figure 4 , Figure 6 As shown, the inverter housing 90 has an inverter outer peripheral surface 90a, an inverter inner peripheral surface 90b and an inverter end surface 90c. The inverter outer peripheral surface 90a and the inverter inner peripheral surface 90b extend in the axial direction AD along the rotation axis Cm. The inverter outer peripheral surface 90a and the inverter inner peripheral surface 90b extend in a ring shape along the circumferential direction CD. The inverter outer peripheral surface 90a is the outer peripheral surface of the inverter housing 90. The inverter inner peripheral surface 90b is the inner peripheral surface of the inverter housing 90. The inverter end surface 90c is the end surface of the inverter housing 90, and a pair is arranged in the axial direction AD. The inverter end surface 90c extends in a direction orthogonal to the axial direction AD. The inverter outer peripheral surface 90a includes an outer peripheral upstream end 90a1 and an outer peripheral downstream end 90a2. The outer peripheral upstream end 90a1 is the upstream side end of the inverter outer peripheral surface 90a. The outer peripheral downstream end 90a2 is a downstream side end portion of the inverter outer peripheral surface 90a, and extends along the outer peripheral edge of the inverter end surface 90c.

[0059] like Figure 4 , Figure 5 As shown, the inverter housing 90 has an inverter peripheral wall 91 and an inverter fin 92. The inverter peripheral wall 91 is formed into a cylindrical shape as a whole and extends along the rotation axis Cm. The inverter peripheral wall 91 extends annularly along the circumferential direction CD. The inverter peripheral wall 91 is formed into a cylindrical shape as a whole. The inverter peripheral wall 91 is the outer peripheral wall of the inverter housing 90. The inverter peripheral wall 91 is sometimes referred to as the housing body. The inner space of the inverter peripheral wall 91 forms the internal space of the inverter housing 90. The inverter peripheral wall 91 forms an inverter outer peripheral surface 90a and an inverter inner peripheral surface 90b.

[0060] The inverter fins 92 are fins provided on the inverter outer peripheral surface 90a. The inverter fins 92 can release the heat of the inverter device 80 to the outside and are heat dissipation fins. The inverter fins 92 increase the surface area of ​​the inverter housing 90 to improve the heat dissipation effect from the inverter housing 90.

[0061] The inverter fin 92 protrudes from the inverter outer peripheral surface 90a. The inverter fin 92 is integrally provided on the inverter outer peripheral wall 91. The inverter fin 92 is formed in a plate shape. The inverter fin 92 extends in a direction orthogonal to the circumferential direction CD. The inverter fin 92 has a pair of plate surfaces arranged along the circumferential direction CD. A plurality of inverter fins 92 are arranged along the inverter outer peripheral surface 90a and in the circumferential direction CD. A plurality of inverter fins 92 extend parallel to each other. The inverter fin 92 is provided near the center of the inverter outer peripheral surface 90a in the axial direction AD. The inverter fin 92 is located on the inverter outer peripheral surface 90a at a position separated from both the outer peripheral upstream end 90a1 and the outer peripheral downstream end 90a2.

[0062] like Fig. 9 As shown, the inverter device 80 has an inverter fin group 93. The inverter fin group 93 has a plurality of inverter fins 92. In the inverter fin group 93, a plurality of inverter fins 92 are densely arranged in the circumferential direction CD. A plurality of inverter fin groups 93 are arranged in the circumferential direction CD along the inverter outer peripheral surface 90a. The inverter fin group 93 is contained in the inverter housing 90.

[0063] The inverter device 80 has an inverter connector 96. The inverter connector 96 protrudes radially outward from the inverter outer peripheral surface 90a. It is a connector part for connecting the inverter device 80 to an external device. As an external device, there is a battery 31, etc. The inverter connector 96 can be connected to a power cable and is connected to the external device via the power cable. The inverter connector 96 protrudes radially outward from the inverter housing 90.

[0064] like Figure 6 , Fig. 9 As shown, the inverter device 80 has a switch module 83. The switch module 83 is housed in the inverter housing 90. The switch module 83 is included in the drive unit 81 and is one of the components constituting the drive unit 81. The switch module 83 is likely to generate heat as the drive unit 81 is driven. The switch module 83 has a switch element and an element protection unit. The switch element is a semiconductor element constituting an inverter, etc. The element protection unit is formed of a resin material and protects the switch element in a state of covering it. The switch module 83 generates heat as power is supplied to itself. The switch module 83 generates heat by the drive for rotating the rotor 20. The switch module 83 is equivalent to a heat generating unit.

[0065] The switch module 83 is arranged on the inner peripheral surface 90b of the inverter. The switch module 83 is fixed to the inner peripheral surface 90b of the inverter by adhesive and bolts. A plurality of switch modules 83 are arranged in the circumferential direction CD along the inner peripheral surface 90b of the inverter. A plurality of switch modules 83 are arranged for each of the plurality of phases. For example, a plurality of switch modules 83 are arranged for each of the U phase, the V phase, and the W phase. In each of the U phase, the V phase, and the W phase, the switch elements of each of the plurality of switch modules 83 are connected in parallel.

[0066] The switch module 83 and the inverter fin 92 are arranged along the radial direction RD. The switch module 83 is arranged at a position where heat is easily transferred to the inverter fin 92 via the inverter outer peripheral wall 91. The switch module 83 is arranged between the outer peripheral upstream end 90a1 and the outer peripheral downstream end 90a2 in the axial direction AD. The switch module 83 is located at a position separated from both the outer peripheral upstream end 90a1 and the outer peripheral downstream end 90a2. In addition, at least a part of the switch module 83 can be located at a position parallel to the inverter fin 92 in the radial direction RD.

[0067] In addition, in the inverter housing 90, as shown in FIG. Fig. 9 As shown, a plurality of large switch modules 83 are arranged in the circumferential direction CD along the inner circumferential surface 90b of the inverter. In addition, in the inverter housing 90, a plurality of switch module groups may be arranged in the circumferential direction CD along the inner circumferential surface 90b of the inverter. The switch module group is arranged in the circumferential direction CD in a manner that a plurality of switch modules 83 are densely packed. In this structure, the switch module group and the inverter fin 92 are arranged in the radial direction RD.

[0068] like Figure 4 , Figure 5 As shown, the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a are arranged along the air supply direction of the air supply fan 111. The air supply direction of the air supply fan 111 is axial AD. In the air supply direction, the motor outer peripheral surface 70a is located on the upstream side of the inverter outer peripheral surface 90a. Therefore, the motor fin 72 is located on the upstream side of the inverter fin 92. The motor fin 72 is equivalent to the upstream fin, and the inverter fin 92 is equivalent to the downstream fin. The motor fin 72 and the inverter fin 92 are arranged along the axial direction AD. For example, by arranging the motor fin group 73 and the inverter fin group 93 along the axial direction AD, the motor fin 72 and the inverter fin 92 are arranged along the axial direction AD.

[0069] The front end of the motor fin 72 and the front end of the inverter fin 92 are arranged in the axial direction AD. In the radial direction RD, the length dimension of the motor fin 72 is substantially the same as the length dimension of the inverter fin 92. The protruding dimension of the motor fin 72 protruding from the motor outer peripheral surface 70a is substantially the same as the protruding dimension of the inverter fin 92 protruding from the inverter outer peripheral surface 90a.

[0070] The fin cover 140 covers the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a via the motor fin 72 and the inverter fin 92. The fin cover 140 covers the motor housing 70 and the inverter housing 90 from the radial outside. The fin cover 140 covers the motor outer peripheral wall 71 and the inverter outer peripheral wall 91 from the outer peripheral side. The fin cover 140 is equivalent to a housing cover. The fin cover 140 is sometimes called a duct and a housing.

[0071] like Figure 6 , Figure 7 As shown, the EDS 50 has a cover flow path 160. The cover flow path 160 is formed between the fin cover 140 and the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a. The cover flow path 160 extends in the circumferential direction CD along the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a. The cover flow path 160 is formed in a ring shape as a whole. The motor fin 72 and the inverter fin 92 are provided in the cover flow path 160. The motor fin 72 and the inverter fin 92 are in a state of being accommodated in the cover flow path 160.

[0072] In the EDS 50, the air sent by the rotor 20 and the blower fan 111 flows in the axial direction AD in the cover flow path 160 as an airflow. In this way, by forcibly causing the air to flow in the cover flow path 160 by the rotor 20 and the blower fan 111, the motor fins 72 and the inverter fins 92 can easily dissipate heat. In other words, the heat generated by the stator 63 and the switch module 83 can be easily dissipated from the motor housing 70 and the inverter housing 90. In addition, the gas that can exchange heat with the motor housing 70 and the inverter housing 90 can flow in the cover flow path 160.

[0073] In the present embodiment, it is assumed that the air flowing in the hood flow path 160 is the air delivered by the air supply fan 111, but in fact, the air delivered by the rotor 20 also flows through the hood flow path 160. The air supply fan 111 is equivalent to a fan. For the EDS 50, the air supply direction of the air supply fan 111 and the rotor 20 is the axial direction AD. The air supply fan 111 is located on the upstream side of the EDS 50.

[0074] like Figure 6 to Figure 9As shown, the fin cover 140 forms a cover flow path 160 and divides the cover flow path 160. The fin cover 140 has an outer peripheral cover portion 141 and a flow path dividing portion 144. The outer peripheral cover portion 141 forms the outer peripheral surface of the fin cover 140. The outer peripheral cover portion 141 is formed in a cylindrical shape as a whole. The outer peripheral cover portion 141 extends annularly along the circumferential direction CD. The outer peripheral cover portion 141 extends along the axial direction AD and, for example, becomes a state that straddles the outer peripheral upstream end 70a1 and the outer peripheral downstream end 90a2. The outer peripheral cover portion 141 extends parallel to the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a. The outer peripheral cover portion 141 covers the motor fins 72 and the inverter fins 92 from the radial outside. The outer peripheral cover portion 141 covers the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a from the radial outside through the motor fins 72 and the inverter fins 92. The outer peripheral cover portion 141 is provided at a position away from the motor fins 72 and the inverter fins 92 toward the outside in the radial direction.

[0075] like Figure 6 , Figure 7 As shown, the peripheral cover portion 141 has a motor cover portion 142 and an inverter cover portion 143. The motor cover portion 142 and the inverter cover portion 143 are arranged along the axial direction AD. The motor cover portion 142 is a portion of the peripheral cover portion 141 that covers the motor fins 72 from the radial outside. The inverter cover portion 143 is a portion of the peripheral cover portion 141 that covers the inverter fins 92 from the radial outside. The boundary portion between the motor cover portion 142 and the inverter cover portion 143 extends annularly along the circumferential direction CD together with the boundary portion between the motor outer peripheral wall 71 and the inverter outer peripheral wall 91.

[0076] The flow path partitioning portion 144 partitions the cover flow path 160 so that air reaches the motor fins 72 and the inverter fins 92 respectively. The flow path partitioning portion 144 is provided between the motor outer peripheral wall 71 and the inverter outer peripheral wall 91 and the outer peripheral cover portion 141. The flow path partitioning portion 144 has an axial partitioning portion 145 and a radial partitioning portion 146.

[0077] The shaft partition 145 partitions the cover flow path 160 in the axial direction AD. The shaft partition 145 is provided between the motor fin 72 and the inverter fin 92. The shaft partition 145 partitions the cover flow path 160 into the motor fin 72 side and the inverter fin 92 side. The shaft partition 145 is formed in a plate shape and extends in a direction orthogonal to the axial direction AD. The shaft partition 145 is provided, for example, at a boundary between the motor outer peripheral wall 71 and the inverter outer peripheral wall 91. The shaft partition 145 extends in the circumferential direction CD along the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a. The shaft partition 145 is formed in an annular shape.

[0078] The diameter partition 146 partitions the cover flow path 160 in the radial direction RD. The diameter partition 146 is provided between the motor fin 72 and the outer peripheral cover portion 141. The diameter partition 146 partitions the cover flow path 160 into the motor fin 72 side and the outer peripheral cover portion 141 side. The diameter partition 146 is formed in a plate shape and extends in a direction orthogonal to the radial direction RD. The diameter partition 146 extends in the circumferential direction CD along the motor outer peripheral surface 70a. The diameter partition 146 is formed in an annular shape. The diameter partition 146 is in a state of straddling a plurality of motor fins 72. The diameter partition 146 extends from the shaft partition 145 toward the motor fin 72 side and in the axial direction AD. The diameter partition 146 covers the motor fin 72 and the motor outer peripheral surface 70a from the radial outside. For example, the diameter partition 146 is in a state of straddling the shaft partition 145 and the outer peripheral upstream end 70a1.

[0079] The radial partition 146 is pressed against the motor fin 72 by the restoring force of the fin cover 140. The fin cover 140 is held in position relative to the motor housing 70 and the inverter housing 90 by pressing the radial partition 146 against the motor fin 72. Figure 6 In the embodiment, the motor fin 72 and the radial partition 146 are separated in the radial direction RD, but in reality, the front end of the motor fin 72 is in contact with the inner peripheral surface of the radial partition 146. However, the fin cover 140 may be fixed to the motor housing 70 and the inverter housing 90 by a fixing member such as a bolt. In this structure, the motor fin 72 and the radial partition 146 may also be separated in the radial direction RD.

[0080] like Figure 6 to Figure 9 As shown, the cover flow path 160 has a first flow path 161 and a second flow path 171. The first flow path 161 and the second flow path 171 are separated by the flow path partition 144 in the cover flow path 160. In the cover flow path 160, the area on the motor fin 72 side relative to the flow path partition 144 is the first flow path 161. In addition, the area on the inverter fin 92 side relative to the flow path partition 144 is the second flow path 171. A part of the second flow path 171 is provided radially outside the first flow path 161.

[0081] like Figure 6 to Figure 8 As shown, the motor fin 72 is provided in the first flow path 161. In the first flow path 161, only the motor fin 72 and the inverter fin 92 are provided. The first flow path 161 accommodates the motor fin 72. The first flow path 161 is a space divided by the motor outer peripheral surface 70a and the flow path partition 144. The first flow path 161 extends in an annular shape along the circumferential direction CD as a whole. The first flow path 161 is provided at a position parallel to the motor outer peripheral surface 70a in the radial direction RD, and on the other hand, is not provided at a position parallel to the inverter outer peripheral surface 90a in the radial direction RD.

[0082] The first flow path 161 has a first inlet 162, a first outlet 163, a first heat dissipation path 164 and a first outflow path 166. The first inlet 162 is the inlet of the first flow path 161 and is arranged at the upstream end of the first flow path 161. The first inlet 162 is open in the axial direction AD. The first inlet 162 directs the first flow path 161 toward the air supply fan 111 and is open in the axial direction AD. The first inlet 162 is arranged at a position further upstream than the motor fin 72. The first inlet 162 extends along the outer peripheral upstream end 70a1 and in the circumferential direction CD. The first inlet 162 is formed in an annular shape. The first inlet 162 is equivalent to the first annular opening and the first axial opening. The first inlet 162 is arranged in the axial direction AD with the motor fin 72. The first inlet 162 is located at a position away from the motor fin 72 to the upstream side in the axial direction AD.

[0083] The first flow outlet 163 is the flow outlet of the first flow path 161, and is arranged at the downstream end of the first flow path 161. The first flow outlet 163 opens the first flow path 161 toward the radial outside. The first flow outlet 163 is located at a position opposite to the first flow inlet 162 across the motor fin 72 in the flow direction of air in the first flow path 161. The first flow outlet 163 is arranged on the outer peripheral surface of the peripheral cover portion 141. The first flow outlet 163 is, for example, arranged in the motor cover portion 142. A plurality of first flow outlets 163 are arranged in the circumferential direction CD. The first flow outlet 163 is arranged between the motor fin 72 and the inverter fin 92 in the axial direction AD. For example, at least a portion of the first flow outlet 163 is arranged between the motor fin 72 and the inverter fin 92 in the axial direction AD. The first flow outlet 163 is equivalent to an intermediate flow outlet.

[0084] The first heat dissipation path 164 is a space for dissipating heat from the motor fins 72 in the first flow path 161. The first heat dissipation path 164 is a space between the motor outer peripheral surface 70a and the radial partition 146. The motor fins 72 are provided in the first heat dissipation path 164. In the radial direction RD, the thickness dimension of the first heat dissipation path 164 is substantially the same as the protruding dimension of the motor fins 72. This is because the motor fins 72 are in contact with the radial partition 146. The first heat dissipation path 164 extends from the first inlet 162 toward the shaft partition 145 and in the axial direction AD. The first heat dissipation path 164 forms the first inlet 162. The upstream end of the first heat dissipation path 164 is the first inlet 162. The first heat dissipation path 164 is a space between the motor outer peripheral surface 70a and the flow path partition 144.

[0085] The first outflow path 166 extends radially outward from the first heat dissipation path 164. The first outflow path 166 forms the first outflow port 163. The downstream end of the first outflow path 166 is the first outflow port 163. The first outflow path 166 penetrates both the radial partition 146 and the outer peripheral cover 141 and is open radially outward. The first outflow path 166 extends from the first heat dissipation path 164 along the axial partition 145 and in the radial direction RD. A plurality of first outflow paths 166 are arranged in the circumferential direction CD.

[0086] The fin cover 140 has an outflow forming portion 148. The outflow forming portion 148 forms a first outflow path 166. The outflow forming portion 148 is formed in a cylindrical shape and extends in the axial direction AD. The outflow forming portion 148 connects the flow path partition portion 144 to the outer peripheral cover portion 141. The internal space of the outflow forming portion 148 becomes the first outflow path 166. The outflow forming portion 148 extends along the shaft partition portion 145. A plurality of outflow forming portions 148 are arranged in the circumferential direction CD. The outflow forming portion 148 is formed to include a portion of the shaft partition portion 145. In addition, the outflow forming portion 148 may also be formed without including the shaft partition portion 145.

[0087] like Figure 8 , Fig.10 As shown, the first flow outlet 163 is provided at a position offset from the motor fin 72 in the circumferential direction CD. For example, the first flow outlet 163 is located between two motor fin groups 73 adjacent in the circumferential direction CD. The first flow outlet 163 is located at a position offset from any one of the two motor fin groups 73 adjacent in the circumferential direction CD in the circumferential direction CD. The first flow outlet 163 is located between the shaft partition 145 and the motor fin 72 in the axial direction AD. The first flow outlet 163 is located at a position offset from the motor fin 72 in the axial direction AD. The first outflow path 166 is provided together with the first flow outlet 163 at a position offset from the motor fin 72 in the circumferential direction CD. In addition, the first flow outlet 163 may also be located at a position overlapping with a portion of the motor fin 72 in the axial direction AD.

[0088] like Figure 6 , Figure 7 , Fig. 9As shown, the inverter fin 92 is provided in the second flow path 171. In the second flow path 171, only the inverter fin 92 among the motor fin 72 and the inverter fin 92 is provided. The second flow path 171 accommodates the inverter fin 92. The second flow path 171 is a space divided by the inverter outer peripheral surface 90a, the flow path partition 144 and the outer peripheral cover part 141. The second flow path 171 extends annularly along the circumferential direction CD as a whole. The second flow path 171 extends along the axial direction AD and crosses the radial partition 146 and the inverter outer peripheral surface 90a. A part of the second flow path 171 is provided on the radial outside of the first flow path 161. In other words, the first flow path 161 is in a state of entering between the second flow path 171 and the motor outer peripheral surface 70a. The first flow path 161 and the second flow path 171 are double flow paths arranged in the radial direction RD.

[0089] The second flow path 171 has a second inlet 172, a second outlet 173, a second heat dissipation path 174 and a second inlet 175. The second inlet 172 is the inlet of the second flow path 171 and is arranged at the upstream end of the second flow path 171. The second inlet 172 is open in the axial direction AD. The second inlet 172 makes the second flow path 171 face the air supply fan 111 and open in the axial direction AD. The second inlet 172 is arranged at a position closer to the upstream side than the inverter fin 92. The second inlet 172 extends along the outer peripheral upstream end 70a1 and in the circumferential direction CD. The second inlet 172 is formed in an annular shape. The second inlet 172 is equivalent to the second annular opening and the second axial opening.

[0090] The second inlet 172 is arranged at a position radially outward than the first inlet 162. In the radial direction RD, the first inlet 162 is arranged between the outer peripheral surface 70a of the motor and the second inlet 172. The first inlet 162 and the second inlet 172 are arranged in the radial direction RD. The second inlet 172 is arranged at a position separated from the inverter fin 92 in either the axial direction AD and the radial direction RD. The second inlet 172 is located at a position away from the inverter fin 92 to the radial outside across the first inlet 162. The second inlet 172 is located at a position away from the inverter fin 92 to the upstream side across the first flow path 161 in the axial direction AD. The radial partition 146 is arranged between the first inlet 162 and the second inlet 172. The radial partition 146 separates the second inlet 172 and the second inlet 172 in the radial direction RD.

[0091] The second outlet 173 is an outlet of the second flow path 171 and is provided at the downstream end of the second flow path 171. The second outlet 173 opens the second flow path 171 in the axial direction AD toward the side opposite to the air supply fan 111. The second outlet 173 is provided at a position further downstream than the inverter fin 92. The second outlet 173 extends along the outer peripheral downstream end 90a2 and in the circumferential direction CD. The second outlet 173 is formed in an annular shape.

[0092] The second outlet 173 is in a state of straddling the inverter outer peripheral surface 90a and the outer peripheral cover portion 141 in the radial direction RD. The second outlet 173 is aligned with both the first inlet 162 and the second inlet 172 in the axial direction AD. In the radial direction RD, the width dimension of the second outlet 173 is larger than either the width dimension of the first inlet 162 or the width dimension of the second inlet 172.

[0093] The second heat dissipation path 174 is a space for dissipating heat from the inverter fins 92 in the second flow path 171. The second heat dissipation path 174 is a space between the inverter outer peripheral surface 90a and the peripheral cover portion 141. The inverter fins 92 are arranged in the second heat dissipation path 174. In the radial direction RD, the thickness dimension of the second heat dissipation path 174 is greater than the protruding dimension of the inverter fins 92. This is because the peripheral cover portion 141 is arranged at a position away from the second inflow path 175 radially outward from the radial partition portion 146. The second heat dissipation path 174 extends from the second flow outlet 173 toward the shaft partition portion 145 and in the axial direction AD. The second heat dissipation path 174 forms the second flow outlet 173. The downstream end of the second heat dissipation path 174 is the second flow outlet 173. The second heat dissipation path 174 is a space between the inverter outer peripheral surface 90a and the inverter cover portion 143.

[0094] The second inlet 175 extends from the second heat dissipation path 174 toward the blower fan 111 in the axial direction AD. The second inlet 175 forms the second inlet 172. The upstream end of the second inlet 175 is the second inlet 172. The second inlet 175 is a space between the flow path partition 144 and the motor cover 142.

[0095] The second inflow path 175 is provided at a position radially outward from the first heat dissipation path 164. The second inflow path 175 is arranged in parallel with the first heat dissipation path 164 in the radial direction RD. In the radial direction RD, the second inflow path 175 is located between the first heat dissipation path 164 and the motor cover 142. The second inflow path 175 extends in an annular shape along the circumferential direction CD. The first outflow path 166 and the outflow forming portion 148 are in a state of penetrating the second inflow path 175 in the radial direction RD.

[0096] A first flow path 161 and a second flow path 171 are formed between the fin cover 140 and the outer peripheral surface 70a, 90a. The flow path partition 144 covers the motor outer peripheral surface 70a to form the first flow path 161 between the flow path partition 144 and the motor outer peripheral surface 70a. The flow path partition 144 is equivalent to the first cover part. The outer peripheral cover part 141 covers the flow path partition 144 and the inverter outer peripheral surface 90a to form the second flow path 171 between the flow path partition 144 and the inverter outer peripheral surface 90a. The outer peripheral cover part 141 is equivalent to the second cover part.

[0097] In the first flow path 161, the first inlet 162 allows air to flow into the first flow path 161 from the outside of the fin cover 140 without passing through the second flow path 171. The first outlet 163 allows the air in the first flow path 161 to flow out to the outside of the fin cover 140 without passing through the second flow path 171. In addition, in the second flow path 171, the second inlet 172 allows air to flow into the second flow path 171 from the outside of the fin cover 140 without passing through the first flow path 161. The second outlet 173 allows the air in the second flow path 171 to flow out to the outside of the fin cover 140 without passing through the first flow path 161.

[0098] like Figure 5 to Figure 7 As shown, the airflow flowing through the cover flow path 160 includes a first airflow Fa1 and a second airflow Fa2. The first airflow Fa1 is an airflow flowing in the first flow path 161. The first airflow Fa1 flows into the first heat dissipation path 164 from the first inlet 162. The first airflow Fa1 exchanges heat with the motor fins 72 in the first heat dissipation path 164. After the first airflow Fa1 is applied with heat from the motor fins 72, it passes through the first outlet 166 and is released to the outside of the fin cover 140 from the first outlet 163. The first airflow Fa1 flows along the motor fins 72 in the first flow path 161, etc., to cool the motor fins 72. The first airflow Fa1 is sometimes referred to as cooling air.

[0099] In the first heat dissipation path 164, since the radial partition 146 is in contact with the front end of the motor fin 72, the first airflow Fa1 easily flows along the plate surface of the motor fin 72. The first airflow Fa1 easily flows between two motor fins 72 adjacent to each other in the circumferential direction CD. In this way, since the area where the first airflow Fa1 flows along the motor fin 72 is large, the first airflow Fa1 easily absorbs the heat of the motor fin 72.

[0100] like Figure 8As shown, the first airflow Fa1 flows outward in the radial direction from the plurality of first outlets 163. In this case, the first airflow Fa1 flows out from the first outlet 163 at a position away from the downstream side of any one of the first inlet 162 and the second inlet 172. Therefore, the first airflow Fa1 flowing out from the first outlet 163 does not flow into the first inlet 162 and the second inlet 172 again.

[0101] like Figure 5 to Figure 7 As shown, the second airflow Fa2 is an airflow flowing in the second flow path 171. The second airflow Fa2 flows from the second inlet 172 through the second inlet path 175 and flows into the second heat dissipation path 174. The second airflow Fa2 exchanges heat with the inverter fins 92 in the second heat dissipation path 174. After the second airflow Fa2 is applied with heat from the inverter fins 92, it is released to the outside of the fin cover 140 from the second outlet 173. The second airflow Fa2 flows along the inverter fins 92 in the second flow path 171, etc., to cool the inverter fins 92. The second airflow Fa2 is sometimes referred to as cooling air.

[0102] like Fig.10 As shown, after the first airflow Fa1 flows into the first inlet 162, it is easy to flow along the plate surface of the motor fin 72 by simply advancing in the axial direction AD. Therefore, in the first flow path 161, the heat of the motor fin 72 is easily applied to the first airflow Fa1. Similarly, after the second airflow Fa2 flows into the second inlet 172, it is easy to flow along the plate surface of the inverter fin 92 by simply advancing in the axial direction AD. Therefore, in the second flow path 171, the heat of the inverter fin 92 is easily applied to the second airflow Fa2.

[0103] According to the present embodiment described so far, the second inlet 172 allows the air outside the fin cover 140 to flow into the second flow path 171 as the second airflow Fa2 without passing through the first flow path 161. In this structure, the second airflow Fa2 that does not absorb the heat of the motor fins 72 flows into the second flow path 171 from the second inlet 172. Therefore, for the second airflow Fa2 that flows into the second flow path 171, it is possible to avoid the ability of the second airflow Fa2 to absorb the heat of the inverter fins 92 in the second flow path 171 from being reduced due to the heat of the motor fins 72 already absorbed in the first flow path 161. For example, it is possible to avoid the temperature of the second airflow Fa2 already being increased due to the heat of the motor fins 72 at the time when the second airflow Fa2 reaches the inverter fins 92. Therefore, the heat dissipation effect of the inverter fins 92 in the second flow path 171 can be improved by the second airflow Fa2 that does not pass through the first flow path 161. As a result, the heat dissipation effect of the EDS 50 and the EDS unit 130 can be improved.

[0104] According to the present embodiment, in the fin cover 140, a first flow path 161 is formed between the radial partition 146 and the motor outer peripheral surface 70a, and a second flow path 171 is formed between the outer peripheral cover portion 141 and the radial partition 146. In this structure, the first flow path 161 and the second flow path 171 are separated in the radial direction RD by the radial partition 146. Therefore, the second airflow Fa2 can reach the inverter fin 92 without passing through the first flow path 161 by flowing through the second flow path 171 on the radially outer side of the first flow path 161. Therefore, it is possible to avoid the second airflow Fa2 absorbing the heat of the motor outer peripheral wall 71 before reaching the inverter fin 92.

[0105] For example, unlike the present embodiment, it is assumed that the second flow path 171 is configured to be formed by the motor outer peripheral surface 70a without accommodating the motor fins 72. In this configuration, the second airflow Fa2 may not absorb the heat of the motor fins 72 in the second flow path 171, but absorb the heat of the motor outer peripheral wall 71 from the motor outer peripheral surface 70a. Therefore, before the second airflow Fa2 reaches the inverter fins 92, it may absorb the heat of the motor outer peripheral wall 71.

[0106] According to the present embodiment, the first inlet 162 extends in an annular shape along the outer peripheral surface 70a of the motor and in the circumferential direction CD. In this structure, the opening area of ​​the first inlet 162 can be increased as much as possible by utilizing the annular shape of the first inlet 162. Therefore, the inflow amount of the first airflow Fa1 into the first inlet 162 can be increased as much as possible. In this way, since as much first airflow Fa1 as possible can flow in the first flow path 161, the cooling effect of the first airflow Fa1 on the motor fin 72 can be improved.

[0107] In addition, the second inlet 172 extends in an annular shape along the outer peripheral surface 90a of the inverter and in the circumferential direction CD. In this structure, the opening area of ​​the second inlet 172 can be increased as much as possible by utilizing the annular shape of the second inlet 172. Therefore, the inflow amount of the second airflow Fa2 into the second inlet 172 can be increased as much as possible. In this way, since as much second airflow Fa2 as possible can flow in the second flow path 171, the cooling effect of the second airflow Fa2 on the inverter fin 92 can be improved.

[0108] Moreover, the second inlet 172 is arranged radially outside the first inlet 162. In this structure, for example, even if the width dimension of the radial direction RD of the first inlet 162 and the second inlet 172 is the same, the opening area of ​​the second inlet 172 is larger than the opening area of ​​the first inlet 162. In this way, a structure that can easily increase the opening area of ​​the second inlet 172 can be realized. Therefore, in addition to the second airflow Fa2 not passing through the first flow path 161, since the flow rate of the second airflow Fa2 flowing through the second flow path 171 is easy to increase, the cooling effect of the inverter fin group 93 can be improved.

[0109] According to the present embodiment, the first inlet 162 and the second inlet 172 are open in the axial direction AD. Therefore, a structure can be achieved in which the first airflow Fa1 flowing in the axial direction AD easily flows into the first inlet 162 and the second airflow Fa2 easily flows into the second inlet 172. Moreover, in a structure in which the second flow path 171 is provided radially outside the first flow path 161, by making both the first inlet 162 and the second inlet 172 open in the axial direction AD, the structure for arranging the first inlet 162 and the second inlet 172 in the radial direction RD can be simplified.

[0110] According to the present embodiment, at least a portion of the first flow outlet 163 is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. In this structure, the first flow path 161 does not need to extend to the position of the inverter fin 92 in the axial direction AD. Therefore, at the position where the inverter fin 92 is provided, the second flow path 171 can be configured to extend along the entire circumferential direction CD. Therefore, by the second airflow Fa2 flowing through the second flow path 171, the inverter outer peripheral wall 91 and the inverter fin 92 can be cooled as a whole in the circumferential direction CD.

[0111] In the present embodiment, the motor fin group 73 and the inverter fin group 93 are arranged in the axial direction AD, and the first flow outlet 163 is located at a position offset from the motor fin group 73 in the circumferential direction CD. In this structure, it is not necessary to configure the first flow outlet 163 between the second flow inlet 172 and the inverter fin 92 in the axial direction AD. Therefore, before the second airflow Fa2 flowing into the second flow inlet 172 reaches the inverter fin 92, it is not necessary to make the outflow forming portion 148 forming the first flow outlet 163 bypass in the circumferential direction CD. In this way, since the second airflow Fa2 can easily reach the inverter fin 92, the heat dissipation effect of the second airflow Fa2 on the inverter fin 92 can be improved.

[0112] According to the present embodiment, the rotor 20 rotates around the rotation axis Cm. In this structure, it is easy to form the shroud flow path 160 so that the air flowing due to the rotation of the rotor 20 flows into the shroud flow path 160.

[0113] According to the present embodiment, the rotor 20 rotates in such a manner that air flows through the first flow path 161 and the second flow path 171. In this structure, both the air flowing by the rotation of the air supply fan 111 and the air flowing by the rotation of the rotor 20 flow through the first flow path 161 and the second flow path 171. Therefore, the amount of air flowing in the cover flow path 160 is easily increased. Therefore, the heat dissipation effect of the motor fin 72 and the inverter fin 92 can be improved by the rotor 20.

[0114] <Second embodiment> In the first embodiment, the first outlet 163 is provided at a position offset from the motor fin group 73 in the circumferential direction CD. In contrast, in the second embodiment, the first outlet 163 is not offset from the motor fin group 73 in the circumferential direction CD. The structure, function, and effect not particularly described in the second embodiment are the same as those in the first embodiment. In the second embodiment, the description will be centered on the points different from the first embodiment.

[0115] like Fig.11 , Fig.12 As shown, the first flow outlet 163 does not move away from the motor fin group 73 in the circumferential direction CD. The first flow outlet 163 is arranged at a position parallel to the motor fin group 73 in the axial direction AD. That is, the first flow outlet 163 is located at a position parallel to the motor fin 72 in the axial direction AD. Therefore, that is, the first flow outlet 163 does not move away from the motor fin 72 in the circumferential direction CD, nor is it offset from the motor fin 72 in the circumferential direction CD. For example, the first flow outlet 163 is arranged near the center of the motor fin group 73 in the circumferential direction CD. In the axial direction AD, the motor fin 72 exists between the first flow inlet 162 and the first flow outlet 163. That is, the motor fin group 73 exists between the first flow inlet 162 and the first flow outlet 163.

[0116] In this embodiment, if Fig.12 As shown, the first airflow Fa1 flowing in from the first inlet 162 reaches the first outlet 163 after flowing along the motor fin 72. Therefore, the first airflow Fa1 easily absorbs the heat of the motor fin 72 before flowing out from the first outlet 163. In other words, it is possible to suppress the first airflow Fa1 flowing in from the first inlet 162 from flowing out from the first outlet 163 without absorbing the heat of the motor fin 72. Therefore, the cooling effect of the first airflow Fa1 on the motor fin 72 can be improved.

[0117] <Third Embodiment> In the first embodiment, the EDS 50 includes one motor device 60 and one inverter device 80. In contrast, in the third embodiment, the EDS 50 includes a plurality of motor devices 60 and a plurality of inverter devices 80. The structure, function, and effect not particularly described in the third embodiment are the same as those in the first embodiment. In the third embodiment, the description will be centered on the points that are different from the first embodiment.

[0118] like Fig.13 As shown, the EDS 50 has two motor devices 60 and two inverter devices 80. That is, the EDS 50 has two motor housings 70 and two inverter housings 90. The two motor devices 60 and the two inverter devices 80 overlap in the axial direction AD. In the axial direction AD, the two motor devices 60 are arranged adjacent to each other, and the two inverter devices 80 are arranged adjacent to each other. The boundary between the motor device 60 and the inverter device 80 is one. The fin cover 140 covers the entirety of the two motor devices 60 and the two inverter devices 80 from the outer peripheral side.

[0119] like Fig.14 , Fig.15 As shown, the motor fin groups 73 of the two motor devices 60 are arranged in the axial direction AD. The inverter fins 92 of the two inverter devices 80 are arranged in the axial direction AD. Furthermore, the motor fin groups 73 of the motor device 60 and the inverter fin groups 93 of the inverter device 80 are arranged in the axial direction AD.

[0120] In the fin cover 140, the radial partition 146 covers the two motor devices 60 from the outer peripheral side. The axial partition 145 and the first outflow port 163 are provided with respect to the boundary portion of the motor device 60 and the inverter device 80 adjacent to each other in the axial direction AD. As in the above-mentioned first embodiment, at least a part of the first outflow port 163 is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. The first airflow Fa1 flows along the two motor fins 72 arranged in the axial direction AD in the first flow path 161, respectively, and then flows out from the first outflow port 163. The second airflow Fa2 flows along the two inverter fins 92 arranged in the axial direction AD in the second flow path 171, respectively, and then flows out from the second outflow port 173.

[0121] <Fourth embodiment> In the first embodiment, the flow path for air flow is formed in two layers in the radial direction RD. In contrast, in the fourth embodiment, the flow path for air flow is formed in three layers in the radial direction RD. The structure, function, and effect not particularly described in the fourth embodiment are the same as those in the first embodiment. In the fourth embodiment, the description will be centered on the points different from the first embodiment.

[0122] like Fig.16 As shown, in the EDS 50, three heat dissipation fins such as the motor fin 72 are arranged in the axial direction AD. The EDS 50 has three housings such as the motor housing 70. Moreover, the three housings are arranged in the axial direction AD. For example, the EDS 50 has two motor devices 60 and one inverter device 80. The two motor devices 60 are arranged in the axial direction AD with one inverter device 80 between them. The two motor fins 72 are arranged in the axial direction AD with one inverter fin 92 between them. That is, the two motor fin groups 73 are arranged in the axial direction AD with one inverter fin group 93 between them.

[0123] like Fig.17 , Fig.18 , Fig.19 As shown, the outer peripheral cover portion 141 covers two motor devices 60 and one inverter device 80 from the radially outer side. The outer peripheral cover portion 141 extends in the axial direction AD so as to cross the two motor devices 60 via one inverter device 80. The outer peripheral cover portion 141 crosses two inverter fins 92 via one inverter fin 92 in the axial direction AD. The outer peripheral cover portion 141 covers the motor fin 72 provided on the upstream side of the air supply fan 111 side, the inverter fin 92, and the motor fin 72 provided on the downstream side opposite to the air supply fan 111 via the inverter fin 92 from the radially outer side.

[0124] The outer peripheral cover 141 includes a first motor cover 142a and a second motor cover 142b as the motor cover 142. The first motor cover 142a and the second motor cover 142b are arranged in the axial direction AD with the inverter cover 143 interposed therebetween. The first motor cover 142a covers the motor fins 72 on the upstream side from the outer peripheral side. The second motor cover 142b covers the motor fins 72 on the downstream side from the outer peripheral side.

[0125] The flow path partition 144 has a first shaft partition 145a and a second shaft partition 145b as the shaft partition 145. The first shaft partition 145a and the second shaft partition 145b are arranged in the axial direction AD. The first shaft partition 145a is provided between the motor fin 72 on the upstream side and the inverter fin 92. The second shaft partition 145b is provided between the inverter fin 92 and the motor fin 72 on the downstream side.

[0126] The flow path partitioning portion 144 has a first diameter partitioning portion 146a and a second diameter partitioning portion 146b as the diameter partitioning portion 146. The first diameter partitioning portion 146a and the second diameter partitioning portion 146b are arranged in the radial direction RD. The first diameter partitioning portion 146a covers the motor fin 72 on the upstream side from the radial outside. The second diameter partitioning portion 146b spans the first diameter partitioning portion 146a and the inverter fin 92 in the axial direction AD. The second diameter partitioning portion 146b covers the first diameter partitioning portion 146a and the inverter fin 92 from the radial outside. The second diameter partitioning portion 146b covers the motor fin 72 on the upstream side from the radial outside across the first diameter partitioning portion 146a.

[0127] The outer peripheral cover portion 141 spans the second radial partition portion 146b and the motor fin 72 on the downstream side in the axial direction AD. The outer peripheral cover portion 141 covers the second radial partition portion 146b and the motor fin 72 on the downstream side from the radial outside. The outer peripheral cover portion 141 covers the inverter fin 92 from the radial outside across the second radial partition portion 146b. The outer peripheral cover portion 141 covers the motor fin 72 from the radial outside across the first radial partition portion 146a and the second radial partition portion 146b.

[0128] The cover flow path 160 has a third flow path 181 in addition to the first flow path 161 and the second flow path 171. The motor fin 72 on the upstream side is provided in the first flow path 161. The inverter fin 92 is provided in the second flow path 171. The motor fin 72 on the downstream side is provided in the third flow path 181. The first flow path 161, the second flow path 171, and the third flow path 181 extend in an annular shape in the circumferential direction CD as a whole.

[0129] A portion of the second flow path 171 is provided radially outside the first flow path 161. A portion of the third flow path 181 is provided radially outside the first flow path 161 and the second flow path 171. The first flow path 161 is provided between the motor fin 72 on the upstream side and the second flow path 171. The second flow path 171 is provided between the first flow path 161 and the third flow path 181. The first flow path 161 and the second flow path 171 are separated by the first shaft separation portion 145a and the first diameter separation portion 146a. The second flow path 171 and the second flow path 181 are separated by the second shaft separation portion 145b and the second diameter separation portion 146b.

[0130] like Fig.16 , Fig.18As shown, similarly to the first embodiment, the first flow path 161 has a first inlet 162, a first outlet 163, a first heat dissipation path 164, and a first outflow path 166. As the second outlet 173, the second flow path 171 has a second outlet 173A. In addition to the second inlet 172, the second outlet 173A, the second heat dissipation path 174, and the second inlet 175, the second flow path 171 also has a second outflow path 176. The third flow path 181 has a third inlet 182, a third outlet 183, and a third heat dissipation path 184. As the outflow forming portion 148, the fin cover 140 has a first outflow forming portion 148a and a second outflow forming portion 148b.

[0131] The motor fin 72 on the upstream side is arranged in the first heat dissipation path 164. The inverter fin 92 is arranged in the second heat dissipation path 174. The motor fin 72 on the downstream side is arranged in the third heat dissipation path 184. The first heat dissipation path 164, the second heat dissipation path 174 and the third heat dissipation path 184 are arranged along the axial direction AD. These heat dissipation paths 164, 174, 184 extend in a ring shape in the circumferential direction CD. The first heat dissipation path 164 is formed between the outer peripheral surface 70a of the motor on the upstream side and the first radial partition 146a. The second heat dissipation path 174 is formed between the outer peripheral surface 90a of the inverter and the second radial partition 146b. The third heat dissipation path 184 is formed between the outer peripheral surface 70a of the motor on the downstream side and the peripheral cover part 141.

[0132] In the first flow path 161, the first outflow path 166 penetrates the first diameter partition 146a and the second diameter partition 146b and is open to the radially outer side. The first flow path 161 is formed by the first outflow forming portion 148a. The first outflow forming portion 148a is in a state of crossing the first diameter partition 146a, the first diameter partition 146a and the outer peripheral cover portion 141 in the radial direction RD. The first flow path 161 and the first outflow forming portion 148a penetrate the second inflow path 175 and the third inflow path 185 in the radial direction RD. A plurality of the first outflow ports 163, the first outflow paths 166 and the first outflow forming portion 148a are arranged in the circumferential direction CD.

[0133] like Fig.16 , Fig.19As shown, the second flow outlet 173A is different from the second flow outlet 173 of the first embodiment, and is arranged in the outer peripheral cover portion 141. The second flow outlet 173A opens the second flow path 171 toward the radial outside. The second flow outlet 173A is arranged in the inverter cover portion 143 in the outer peripheral cover portion 141. A plurality of second flow outlets 173A are arranged in the circumferential direction CD. The second flow outlet 173A is arranged between the motor fin 72 and the inverter fin 92 on the upstream side in the axial direction AD. For example, at least a portion of the second flow outlet 173A is arranged between the motor fin 72 and the inverter fin 92 on the upstream side in the axial direction AD. The second flow outlet 173A is equivalent to an intermediate flow outlet.

[0134] The second outflow path 176 extends from the second heat dissipation path 174 toward the radially outer side. The second outflow path 176 forms a second outflow port 173A. The second outflow path 176 penetrates both the flow path partition 144 and the peripheral cover portion 141 and is open to the radially outer side. The second outflow path 176 is formed by a second outflow forming portion 148b. The second outflow forming portion 148b is in a state of crossing the second radial partition 146b and the peripheral cover portion 141 in the radial direction RD. The second flow path 171 and the second outflow forming portion 148b penetrate the third inflow path 185 in the radial direction RD. A plurality of second outflow ports 173A, second outflow paths 176 and second outflow forming portions 148b are arranged in the circumferential direction CD.

[0135] The third flow path 181 is configured similarly to the second flow path 171 in that it covers the other flow paths from the radially outer side. The second flow path 171 covers the first flow path 161 from the radially outer side, whereas the third flow path 181 covers the second flow path 171 from the radially outer side. The third inlet 182 is open in the axial direction AD and extends annularly in the circumferential direction CD, similarly to the first inlet 162 and the second inlet 172. The third inlet 185 extends from the third heat dissipation path 184 in the axial direction AD and forms the third inlet 182. The third outlet 183 is open in the axial direction AD and extends annularly in the circumferential direction CD, similarly to the second outlet 173 of the first embodiment.

[0136] like Figure 16 to Figure 19As shown, in the airflow flowing through the cover flow path 160, in addition to the first airflow Fa1 and the second airflow Fa2, a third airflow Fa3 is also included. The third airflow Fa3 is an airflow flowing in the third flow path 181. The third airflow Fa3 flows into the third heat dissipation path 184 from the third inlet 182. The third airflow Fa3 exchanges heat with the motor fins 72 on the downstream side in the third heat dissipation path 184. After applying heat to the motor fins 72 on the downstream side, the third airflow Fa3 is released to the outside of the fin cover 140 from the third outlet 183. The third airflow Fa3 flows along the motor fins 72 on the downstream side in the third flow path 181 and cools the motor fins 72 on the downstream side. The third airflow Fa3 is sometimes referred to as cooling air.

[0137] <Fifth embodiment> In the first embodiment, the outer peripheral cover 141 extends in the axial direction AD in parallel with the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a. In contrast, in the fifth embodiment, the outer peripheral cover 141 is inclined relative to the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a. The structure, function, and effect not particularly described in the fifth embodiment are the same as those in the first embodiment. In the fifth embodiment, the description will be centered on the points that are different from the first embodiment.

[0138] like Fig. 20 , Fig.21 , Fig. 22 As shown, the outer peripheral cover portion 141 is inclined in such a manner that the outer peripheral surface of the outer peripheral cover portion 141 is directed toward the side opposite to the air supply fan 111. The separation distance between the outer peripheral cover portion 141 and the outer peripheral surface 70a of the motor in the radial direction RD gradually decreases toward the side opposite to the air supply fan 111 in the axial direction AD. Similarly, the separation distance between the outer peripheral cover portion 141 and the outer peripheral surface 90a of the inverter in the radial direction RD gradually decreases toward the side opposite to the air supply fan 111 in the axial direction AD. On the other hand, the radial partition portion 146 extends in the axial direction AD in parallel with the outer peripheral surface 70a of the motor.

[0139] The thickness dimension of the second flow path 171 in the radial direction RD gradually decreases toward the downstream side. The cross-sectional area of ​​the cross section orthogonal to the axial direction AD in the second flow path 171 gradually decreases toward the downstream side. For example, the thickness dimension of the second inflow path 175 in the radial direction RD gradually decreases toward the second outflow port 173 in the axial direction AD. In addition, the thickness dimension of the second heat dissipation path 174 in the radial direction RD gradually decreases toward the second outflow port 173 in the axial direction AD.

[0140] like Fig.21 , Fig. 22As shown, after the second airflow Fa2 flows into the second inlet 172, it flows along the inner peripheral surface of the outer peripheral cover portion 141 and toward the second outlet 173. The second airflow Fa2 is guided radially inward by the outer peripheral cover portion 141 to approach the inverter fin 92 in the second heat dissipation path 174. Therefore, the second airflow Fa2 easily passes between two inverter fins 92 adjacent in the circumferential direction CD. That is, the second airflow Fa2 easily flows along the plate surface of the inverter fin 92.

[0141] <Sixth embodiment> In the first embodiment, the length dimension of the motor fin 72 and the inverter fin 92 in the radial direction RD is the same. In contrast, in the sixth embodiment, the length dimension of the inverter fin 92 in the radial direction RD is larger than the length dimension of the motor fin 72. The structure, function, and effect not particularly described in the sixth embodiment are the same as those in the first embodiment. In the sixth embodiment, the description will be centered on the points different from the first embodiment.

[0142] like Fig.23 , Fig.24 , Fig.25 As shown, in the radial direction RD, the protruding dimension of the inverter fin 92 protruding from the inverter outer peripheral surface 90a is greater than the protruding dimension of the motor fin 72 protruding from the motor outer peripheral surface 70a. For example, the inverter fin 92 protrudes radially outward more than the radial partition 146 in the radial direction RD. The front end portion of the inverter fin 92 is located between the radial partition 146 and the peripheral cover portion 141 in the radial direction RD. The front end portion of the inverter fin 92 is located at a position parallel to the second inlet 172 in the axial direction AD.

[0143] The front end of the inverter fin 92 contacts the outer peripheral cover 141. For example, the outer peripheral cover 141 is pressed against the inverter fin 92 by the restoring force of the fin cover 140. The fin cover 140 holds the position relative to the motor housing 70 and the inverter housing 90 by pressing the outer peripheral cover 141 against the inverter fin 92.

[0144] In addition, in the radial direction RD, preferably, the positional relationship between the inverter fin 92 and the peripheral cover portion 141 is the same as the positional relationship between the motor fin 72 and the radial partition portion 146. For example, if the motor fin 72 and the radial partition portion 146 are separated in the radial direction RD, the inverter fin 92 and the peripheral cover portion 141 may also be separated in the radial direction RD. In this structure, the separation distance between the inverter fin 92 and the peripheral cover portion 141 in the radial direction RD may also be substantially the same as the separation distance between the motor fin 72 and the radial partition portion 146.

[0145] like Fig.24 , Fig.25As shown, after the second airflow Fa2 flows into the second inlet 172, it can easily reach the front end of the inverter fin 92 only by flowing along the peripheral cover portion 141 in the axial direction AD. This is because the inverter fin 92 is parallel to the second inlet 172 and the second inlet path 175 in the axial direction AD. Therefore, after the second airflow Fa2 flows from the second inlet path 175 into the second heat dissipation path 174, it is easy to reach the inverter fin 92 even if it does not flow radially inward. In this way, even if the second airflow Fa2 only flows along the peripheral cover portion 141 and in the axial direction AD, it is easy to flow along the plate surface of the inverter fin 92.

[0146] <Seventh embodiment> In the first embodiment, the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a are arranged along the axial direction AD. In contrast, in the seventh embodiment, the inverter outer peripheral surface 90a is arranged at a position radially outward of the motor outer peripheral surface 70a. The structure, function, and effect not particularly described in the seventh embodiment are the same as those in the first embodiment. In the seventh embodiment, the description will be centered on the points different from the first embodiment.

[0147] like Fig.26 , Fig. 27 , Fig.28 As shown, the inverter housing 90 protrudes radially outwardly more than the motor housing 70. For example, the inverter outer peripheral wall 91 protrudes radially outwardly more than the motor outer peripheral wall 71. The inverter outer peripheral surface 90a is arranged at a position away from the motor outer peripheral surface 70a in the radial direction. The inverter fin 92 is arranged together with the inverter outer peripheral surface 90a at a position away from the motor outer peripheral surface 70a in the radial direction. The inverter fin 92 protrudes radially outwardly more than the motor fin 72 by the amount that the inverter outer peripheral surface 90a protrudes radially outwardly from the motor outer peripheral surface 70a.

[0148] like Fig. 27 , Fig.28 As shown, similarly to the sixth embodiment, the front end of the inverter fin 92 is located between the radial partition 146 and the outer peripheral cover 141 in the radial direction RD. For example, the inverter outer peripheral surface 90a is located at a position away from the motor outer peripheral surface 70a in the radial direction to the outside to the extent that the front end of the inverter fin 92 contacts the outer peripheral cover 141. Similar to the sixth embodiment, the second airflow Fa2 easily flows along the plate surface of the inverter fin 92 even if it flows only along the outer peripheral cover 141 and in the axial direction AD.

[0149] The second heat dissipation path 174 is thinned in the radial direction RD by the amount that the inverter outer peripheral surface 90a protrudes radially outward from the motor outer peripheral surface 70a. The inverter outer peripheral surface 90a is disposed toward the radial outward and close to the outer peripheral cover portion 141. Therefore, after the second airflow Fa2 flows into the second heat dissipation path 174 from the second inflow path 175, it is easy to flow along the inverter outer peripheral surface 90a. Therefore, the second airflow Fa2 is easy to absorb the heat of the inverter outer peripheral wall 91 from the inverter outer peripheral surface 90a.

[0150] <Eighth Embodiment> In the first embodiment, the first heat dissipation path 164 and the second heat dissipation path 174 are arranged along the axial direction AD. In contrast, in the eighth embodiment, the second heat dissipation path 174 is provided at a position away from the first heat dissipation path 164 in the radial direction outward. The structure, function, and effect not particularly described in the eighth embodiment are the same as those in the first embodiment. In the eighth embodiment, the description will be centered on the points different from the first embodiment.

[0151] like Fig.29 , Fig.30 As shown, the inverter outer peripheral wall 91 is arranged at a position aligned with the radial partition 146 in the axial direction AD. The inverter outer peripheral surface 90a is aligned with the outer peripheral surface of the radial partition 146 in the axial direction AD. In this embodiment, similarly to the seventh embodiment described above, the inverter outer peripheral surface 90a is arranged at a position radially outward relative to the motor outer peripheral surface 70a. The inverter housing 90 protrudes radially outward relative to the first heat dissipation path 164. In the inverter housing 90, the inverter end surface 90c on the upstream side is in a state of dividing the first heat dissipation path 164.

[0152] In the second flow path 171, the thickness dimension of the second inflow path 175 in the radial direction RD is substantially the same as the thickness dimension of the second heat dissipation path 174. In addition, the second inflow path 175 and the second heat dissipation path 174 are arranged along the axial direction AD. In the second flow path 171, the thickness dimension in the radial direction RD is uniform in the axial direction AD. Therefore, the second airflow Fa2 flowing into the second inlet 172 can easily flow along the plate surface of the inverter fin 92 only by flowing in the second inflow path 175 and the second heat dissipation path 174.

[0153] <Ninth embodiment> In the first embodiment, the second inlet 172 is disposed at a position further upstream than the motor fin 72. In contrast, in the ninth embodiment, the second inlet 172 is disposed at a position further downstream than the motor fin 72. The structure, function, and effect not particularly described in the ninth embodiment are the same as those in the first embodiment. In the ninth embodiment, the description will be centered on the points different from the first embodiment.

[0154] like Fig.31 , Fig.33 As shown, as the second inlet 172, the second flow path 171 has a second inlet 172A. The second inlet 172A is different from the second inlet 172 of the first embodiment described above, and is arranged in the peripheral cover portion 141. The second inlet 172A opens the second flow path 171 toward the radial outside. The second inlet 172A is arranged in the inverter cover portion 143 in the peripheral cover portion 141. A plurality of second inlet 172A are arranged in the circumferential direction CD. The second inlet 172A is arranged between the motor fin 72 and the inverter fin 92 in the axial direction AD. For example, at least a portion of the second inlet 172A is arranged between the motor fin 72 and the inverter fin 92 in the axial direction AD. The second inlet 172A is equivalent to a second cover port.

[0155] like Fig.32 , Fig.33 As shown, the shaft partition 145 is provided between the first heat dissipation path 164 and the second heat dissipation path 174 in the same manner as in the first embodiment, and separates the first heat dissipation path 164 and the second heat dissipation path 174 in the axial direction AD. The diameter partition 146 is different from the first embodiment and is provided between the inverter fin 92 and the outer peripheral cover 141. The diameter partition 146 covers the inverter fin 92 from the radially outer side. The diameter partition 146 may or may not contact the front end of the inverter fin 92.

[0156] The first outflow passage 166 is different from the first embodiment described above, and extends from the first heat dissipation passage 164 toward the downstream side and in the axial direction AD. As the first outflow port 163, the first outflow passage 166 has a first outflow port 163A. The first outflow port 163A opens the first outflow passage 166 toward the downstream side and in the axial direction AD. The first outflow port 163A is arranged radially outside the second outflow port 173. The first outflow port 163A extends along the second outflow port 173 and in the radial direction RD. The first outflow port 163A is formed in an annular shape.

[0157] like Fig.31 , Fig.33 As shown, the second inlet 172A is the inlet of the second inlet path 175. The second inlet path 175 extends from the second heat dissipation path 174 toward the radially outer side. The second inlet path 175 penetrates both the radial partition 146 and the outer peripheral cover 141 and is open to the radially outer side. The second inlet path 175 extends from the second heat dissipation path 174 along the axial partition 145 and in the radial direction RD. A plurality of second inlet paths 175 are arranged in the circumferential direction CD.

[0158] The fin cover 140 has an inflow forming portion 149. The inflow forming portion 149 forms a second inflow path 175 and a second inflow port 172A. The inflow forming portion 149 is formed in a cylindrical shape and extends in the axial direction AD. The inflow forming portion 149 connects the flow path partition portion 144 to the outer peripheral cover portion 141. The internal space of the inflow forming portion 149 becomes the second inflow path 175. The inflow forming portion 149 extends along the shaft partition portion 145. The inflow forming portion 149 is formed to include a part of the shaft partition portion 145. A plurality of inflow forming portions 149 are arranged in the circumferential direction CD. In addition, the inflow forming portion 149 may be formed without including the shaft partition portion 145.

[0159] like Fig.31 As shown, the EDS unit 130 has an air supply fan 111A as an air supply fan 111. The air supply fan 111A is provided on the downstream side of the EDS 50. The air supply device 110 having the air supply fan 111A is provided on the downstream side of the EDS 50. The air supply fan 111A conveys air in the axial direction AD toward the side opposite to the EDS 50. The air supply fan 111A causes the outside air to flow into the first inlet 162 by causing the air to flow out from the first outlet 163A in a manner of sucking out the air of the first flow path 161. In addition, the air supply fan 111A causes the outside air to flow into the second outlet 173 by causing the air to flow out from the second outlet 173 in a manner of sucking out the air of the second flow path 171. The air supply fan 111A is equivalent to a downstream fan.

[0160] As the blower fan 111A is driven, the first airflow Fa1 and the second airflow Fa2 flow in the cover flow path 160. The first airflow Fa1 flows out of the first outlet 163A and flows into the first inlet 162. The second airflow Fa2 flows out of the second outlet 173 and flows into the second inlet 172A.

[0161] According to the present embodiment, at least a portion of the second inlet 172A is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. In this structure, it is easy to realize a structure in which the second inlet 172A is provided at a position further downstream than the motor fin 72. That is, it is easy to realize a structure in which the motor fin 72 is not provided in the second flow path 171. Therefore, it is possible to reliably suppress the second airflow Fa2 flowing into the second inlet 172A from absorbing the heat of the motor fin 72.

[0162] According to the present embodiment, the air supply fan 111A is disposed downstream of the second outlet 173. In this structure, the second air flow Fa2 can flow in from the second inlet 172A by causing the air supplied by the air supply fan 111A to be sucked out from the second outlet 173. Therefore, even if the second inlet 172A is opened radially outward, a structure in which the second air flow Fa2 flows into the second inlet 172A can be achieved.

[0163] <Tenth embodiment> In the ninth embodiment, the fin cover 140 has the flow path partition 144. In contrast, in the tenth embodiment, the fin cover 140 does not have the flow path partition 144. The structure, function, and effect not particularly described in the tenth embodiment are the same as those in the ninth embodiment. In the tenth embodiment, the description will be centered on the points different from the ninth embodiment.

[0164] like Fig.34 , Fig.35 As shown, the fin cover 140 does not separate the first flow path 161 and the second flow path 171. No flow path partition 144 is provided in the cover flow path 160. The first flow path 161 and the second flow path 171 are arranged in the axial direction AD and form a continuous space. In the cover flow path 160, the space for accommodating the motor fins 72 is the first flow path 161, and the space for accommodating the inverter fins 92 is the second flow path 171. The boundary between the first flow path 161 and the second flow path 171 is parallel to the boundary between the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a in the radial direction RD. The first flow outlet 163 is included in the boundary between the first flow path 161 and the second flow path 171.

[0165] As the second inlet 172, the second flow path 171 has a second inlet 172B. The second inlet 172B is provided in the outer peripheral cover portion 141 in the same manner as the second inlet 172A of the ninth embodiment. A plurality of second inlets 172B are arranged in the circumferential direction CD. The second inlet 172B is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. For example, at least a portion of the second inlet 172B is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. The second inlet 172B is equivalent to a second cover port and a second common port.

[0166] A through hole forming the second inlet 172B is provided in the outer peripheral cover portion 141. The through hole penetrates the outer peripheral cover portion 141 in the radial direction RD. The through hole forms a second inlet path 175 in addition to the second inlet 172B. The inner space of the through hole is the second inlet path 175. In the outer peripheral cover portion 141, the portion where the through hole is formed is also the inlet forming portion 149 forming the second inlet path 175.

[0167] In this embodiment, similarly to the ninth embodiment, the air supply fan 111A is provided on the downstream side of the EDS 50. The air supply fan 111A causes the air in the second flow path 171 to flow out from the second flow outlet 173, thereby causing the outside air to flow into the second flow inlet 172B. In addition, the air supply fan 111A causes the air in the second flow path 171 to flow out from the second flow outlet 173, thereby causing the outside air to flow into the first flow inlet 162.

[0168] In the cover flow path 160, similarly to the ninth embodiment, the first airflow Fa1 and the second airflow Fa2 flow as the air supply fan 111A is driven. The second airflow Fa2 flows out from the second outlet 173 and flows into the second inlet 172B. The first airflow Fa1 flows into the first inlet 162 as the second airflow Fa2 flows out from the second outlet 173. Then, the first airflow Fa1 that flows into the first inlet 162 flows from the first flow path 161 through the second flow path 171 and flows out from the second outlet 173 to the outside. After the second airflow Fa2 flows into the second flow path 171 from the second inlet 172B, it flows along the inverter fins 92 while merging with the first flow path 161 that flows into the second flow path 171 from the first flow path 161.

[0169] According to the present embodiment, at least a portion of the second inlet 172B is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. In this structure, it is possible to achieve a structure in which the second inlet 172B is provided at a position further downstream than the motor fin 72. Therefore, it is possible to reliably suppress the second airflow Fa2 flowing into the second inlet 172B from absorbing the heat of the motor fin 72.

[0170] According to the present embodiment, similarly to the ninth embodiment, the air supply fan 111A is disposed downstream of the second outlet 173. In this structure, the second air flow Fa2 can flow in from the second inlet 172B by causing the air supplied by the air supply fan 111A to be sucked out from the second outlet 173. Therefore, even if the second inlet 172B is opened radially outward, a structure in which the second air flow Fa2 flows into the second inlet 172B can be achieved.

[0171] According to the present embodiment, at least a portion of the second inlet 172B is located between the motor fin 72 and the inverter fin 92 in the axial direction AD in the peripheral cover portion 141 in such a manner that the second airflow Fa2 merges with the first airflow Fa1 and flows along the inverter fin 92. In this structure, even if the first flow path 161 and the second flow path 171 are not separated, the second airflow Fa2 flowing in from the second inlet 172 can be suppressed from absorbing the heat of the motor fin 72. Therefore, simply by providing the second inlet 172B in the peripheral cover portion 141, it is possible to achieve a heat dissipation effect of the inverter fin 92 in the second flow path 171 by the second airflow Fa2 that does not pass through the first flow path 161.

[0172] <Eleventh Embodiment> In the first embodiment, the first flow path 161 and the second flow path 171 are separated in the radial direction RD. In contrast, in the eleventh embodiment, the first flow path 161 and the second flow path 171 are separated in the circumferential direction CD. The structure, function, and effect not particularly described in the eleventh embodiment are the same as those in the first embodiment. In the eleventh embodiment, the description will be centered on the points different from the first embodiment.

[0173] like Fig.36 , Fig.37 , Fig.38 As shown, the motor fin 72 and the inverter fin 92 are arranged at positions offset in the circumferential direction CD. That is, the motor fin group 73 and the inverter fin group 93 are located at positions offset in the circumferential direction CD. For example, the area between two motor fin groups 73 adjacent to each other in the circumferential direction CD is located at a position aligned with the inverter fin group 93 in the axial direction AD. Similarly, the area between two inverter fin groups 93 adjacent to each other in the circumferential direction CD is located at a position aligned with the motor fin group 73 in the axial direction AD.

[0174] In this embodiment, the first flow path 161 and the second flow path 171 are arranged in the circumferential direction CD. A plurality of the first flow path 161 and the second flow path 171 are arranged in the circumferential direction CD. For example, the first flow path 161 and the second flow path 171 are arranged alternately one by one in the circumferential direction CD. In the first flow path 161 and the second flow path 171, the first inlet 162 and the second inlet 172 are arranged in the circumferential direction CD. In addition, the first outlet 163 and the second outlet 173 are arranged in the circumferential direction CD.

[0175] At a position parallel to the motor outer peripheral surface 70a in the radial direction RD, the first heat dissipation path 164 and the second inflow path 175 are arranged in the circumferential direction CD. The second inflow path 175 is provided between two motor fin groups 73 adjacent to each other in the circumferential direction CD. At a position parallel to the inverter outer peripheral surface 90a in the radial direction RD, the second heat dissipation path 174 and the first outflow path 166 are arranged in the circumferential direction CD. The first outflow path 166 is provided between two inverter fin groups 93 adjacent to each other in the circumferential direction CD.

[0176] The first heat dissipation path 164 and the second heat dissipation path 174 are adjacent to each other in at least one direction of the axial direction AD and the circumferential direction CD. For example, in the circumferential direction CD, the width dimension of the first heat dissipation path 164 is greater than the width dimension of the first outflow path 166. In addition, the width dimension of the second heat dissipation path 174 is greater than the width dimension of the second inflow path 175. A portion of the first heat dissipation path 164 is located at a position aligned with the second heat dissipation path 174 in the axial direction AD. A portion of the second heat dissipation path 174 is located at a position aligned with the first heat dissipation path 164 in the axial direction AD.

[0177] The flow path partitioning portion 144 has a peripheral partitioning portion 147. The peripheral partitioning portion 147 is provided between the first flow path 161 and the second flow path 171 in the cover flow path 160. The peripheral partitioning portion 147 is provided between the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a and the outer peripheral cover portion 141, and partitions the first flow path 161 and the second flow path 171 in the circumferential direction CD. The outer peripheral cover portion 141 covers the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a so as to form both the first flow path 161 and the second flow path 171. The outer peripheral cover portion 141 is equivalent to a peripheral extension portion.

[0178] The first airflow Fa1 and the second airflow Fa2 flow substantially in the axial direction AD. The first airflow Fa1 flowing into the first inlet 162 absorbs heat from the motor fins 72 in the first heat dissipation path 164, passes through the first outflow path 166, and flows out from the first outlet 163. The second airflow Fa2 flowing into the second inlet 172 passes through the second inlet path 175 and reaches the second heat dissipation path 174, absorbs heat from the inverter fins 92 in the second heat dissipation path 174, and flows out from the second outlet 173.

[0179] The outer peripheral cover portion 141 is in contact with both the motor fin 72 and the inverter fin 92. For example, the outer peripheral cover portion 141 is pressed against both the motor fin 72 and the inverter fin 92 by the restoring force of the fin cover 140. In this structure, the first airflow Fa1 easily flows along the plate surface of the motor fin 72, and the second airflow Fa2 easily flows along the plate surface of the inverter fin 92.

[0180] According to the present embodiment, the circumferential partition 147 separates the first flow path 161 and the second flow path 171 in such a manner that the first flow path 161 and the second flow path 171 are arranged in the circumferential direction CD. In this structure, it is not necessary to overlap the first flow path 161 and the second flow path 171 in the radial direction RD. Therefore, similarly to the first embodiment described above, the heat dissipation effect of the inverter fins 92 in the second flow path 171 can be improved by the second airflow Fa2 that does not pass through the first flow path 161, and the fin cover 140 can be prevented from being enlarged in the radial direction RD.

[0181] <Twelfth embodiment> In the eleventh embodiment, the first outlet 163 is open in the axial direction AD. In contrast, in the twelfth embodiment, the first outlet 163 is open radially outward. The structure, function, and effect not specifically described in the twelfth embodiment are the same as those in the eleventh embodiment. In the twelfth embodiment, the description will be centered on the points different from the eleventh embodiment.

[0182] like Fig.39 , Fig.40 , Fig.41 As shown, the first flow outlet 163 is provided at the peripheral cover portion 141 in the same manner as in the above-mentioned first embodiment. The first flow outlet 163 opens the first heat dissipation path 164 to the radially outer side. The first flow outlet 163 is provided between the motor fin 72 and the inverter fin 92 in the axial direction AD. For example, the first flow outlet 163 is provided at a position that straddles the boundary between the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a in the axial direction AD. In addition, the first flow outlet 163 may be located at a position closer to the motor fin 72 side than the boundary between the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a, or may be located at a position on the inverter fin 92 side.

[0183] A through hole forming the first outflow port 163 is provided in the outer peripheral cover portion 141. The through hole penetrates the outer peripheral cover portion 141 in the radial direction RD, and forms a first outflow path 166 in addition to the first outflow port 163. The inner space of the through hole is the first outflow path 166. In the outer peripheral cover portion 141, the portion where the through hole is formed is also the outflow forming portion 148 forming the first outflow path 166.

[0184] The first outflow path 166 is not arranged at a position aligned with the second heat dissipation path 174 in the circumferential direction CD. That is, the first outflow path 166 does not extend from the first heat dissipation path 164 along the outer peripheral surface 90a of the inverter toward the downstream side and in the axial direction AD. In the axial direction AD, the entire area on the downstream side of the first heat dissipation path 164 becomes the second heat dissipation path 174. In addition, the second heat dissipation path 174 may also be divided into a plurality of parts in the circumferential direction CD. For example, a dividing portion that divides the second heat dissipation path 174 in the circumferential direction CD may also be provided between two adjacent inverter fin groups 93 in the circumferential direction CD.

[0185] The flow path partitioning portion 144 has an axial partitioning portion 145 in addition to the circumferential partitioning portion 147. The axial partitioning portion 145 connects two adjacent circumferential partitioning portions 147 in the circumferential direction CD via the motor fin group 73. The axial partitioning portion 145 is between the motor fin 72 and the inverter fin 92 in the axial direction AD, and partitions the first heat dissipation path 164 and the second heat dissipation path 174 in the axial direction AD.

[0186] According to the present embodiment, the first outflow path 166 does not vertically cross the inverter outer peripheral surface 90a along the axial direction AD. In this structure, the range of the second airflow Fa2 flowing along the inverter outer peripheral surface 90a can be as large as possible. Therefore, the second airflow Fa2 that does not absorb the heat of the motor fins 72 can cool a large area of ​​the inverter outer peripheral surface 90a.

[0187] <Thirteenth embodiment> In the eleventh embodiment, the first flow path 161 and the second flow path 171 are separated in the circumferential direction CD. In contrast, in the thirteenth embodiment, the first flow path 161 and the second flow path 171 are separated in the axial direction AD. The structure, function, and effect not particularly described in the thirteenth embodiment are the same as those in the twelfth embodiment. In the thirteenth embodiment, the description will be centered on the points different from the twelfth embodiment.

[0188] like Fig.42 , Fig.43 , Fig.44 As shown, the first flow path 161 and the second flow path 171 are arranged along the axial direction AD. The first flow path 161 and the second flow path 171 extend annularly in the circumferential direction CD. The first flow path 161 is arranged on the upstream side of the second flow path 171 in the axial direction AD. In the first flow path 161, the first inlet 162 is open in the axial direction AD, and on the other hand, the first outlet 163 is open to the radial outside. The first outlet 163 is provided in the outer peripheral cover portion 141 in the same manner as in the above-mentioned twelfth embodiment. The outer peripheral cover portion 141 is equivalent to the shaft extension portion.

[0189] In the second flow path 171, the second flow outlet 173 is open in the axial direction AD, and on the other hand, the second flow inlet 172 is open to the radial outside. The second flow inlet 172 is arranged in the peripheral cover part 141 in the same manner as the first flow outlet 163. The second flow inlet 172 opens the second heat dissipation path 174 to the radial outside. The second flow inlet 172 is arranged between the motor fin 72 and the inverter fin 92 in the axial direction AD. For example, the second flow inlet 172 is arranged at a position that straddles the boundary between the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a in the axial direction AD. In addition, the second flow inlet 172 can be located at a position closer to the motor fin 72 side than the boundary between the motor outer peripheral surface 70a and the inverter outer peripheral surface 90a, or it can be located at a position on the inverter fin 92 side.

[0190] The outer peripheral cover portion 141 is provided with a through hole forming the second inlet 172. The through hole penetrates the outer peripheral cover portion 141 in the radial direction RD, and forms a second inlet path 175 in addition to the second inlet 172. The inner space of the through hole is the second inlet path 175. In the outer peripheral cover portion 141, the portion where the through hole is formed is also the inlet forming portion 149 forming the second inlet path 175.

[0191] The flow path partitioning portion 144 has an axial partitioning portion 145, but does not have a circumferential partitioning portion 147. The axial partitioning portion 145 is provided between the first heat dissipation path 164 and the second heat dissipation path 174 in the axial direction AD. The axial partitioning portion 145 extends in the circumferential direction CD and partitions the first heat dissipation path 164 and the second heat dissipation path 174 in the axial direction AD.

[0192] The first inlet 163 and the second inlet 172 are arranged alternately in the circumferential direction CD. At least a portion of the second inlet 172 is disposed at a position further upstream than the first inlet 163 in the axial direction AD. The first inlet 163 is disposed at a position further to the motor fin 72 than the flow path partition 144. The second inlet 172 is disposed at a position further to the inverter fin 92 than the flow path partition 144.

[0193] In addition, similar to the second heat dissipation path 174 of the twelfth embodiment, the first heat dissipation path 164 may be divided into a plurality of parts in the circumferential direction CD. For example, a dividing portion for dividing the first heat dissipation path 164 in the circumferential direction CD may be provided between two motor fin groups 73 adjacent in the circumferential direction CD.

[0194] like Fig.42As shown, in the EDS unit 130, air supply fans 111 are respectively provided on the upstream side and the downstream side of the EDS 50. For example, the air supply fan 111 as an upstream fan is provided on the upstream side of the EDS 50, and the air supply fan 111A as a downstream fan is provided on the downstream side of the EDS 50. By driving both the air supply fans 111 and 111A, the first air flow Fa1 and the second air flow Fa2 flow in the hood flow path 160. The air supply fan 111 as the upstream fan causes the first air flow Fa1 to flow in by pressing the first air flow Fa1 into the first inlet 162, and causes the first air flow Fa1 to flow out from the first outlet 163. The air supply fan 111A as the downstream fan causes the second air flow Fa2 to flow out by sucking the second air flow Fa2 from the second outlet 173, and causes the second air flow Fa2 to flow into the first inlet 162.

[0195] In the hood flow path 160, at least a portion of the first outlet 163 from which the first airflow Fa1 flows out is disposed on the upstream side of the second inlet 172 from which the second airflow Fa2 flows in. Furthermore, the first outlet 163 and the second inlet 172 are disposed at positions separated in the circumferential direction CD. Therefore, it is difficult for the first airflow Fa1 flowing out of the first outlet 163 to flow into the second inlet 172. Therefore, it is possible to suppress the mixing of the first airflow Fa1 and the second airflow Fa2 flowing into the second inlet 172, thereby preventing the temperature of the second airflow Fa2 from rising.

[0196] According to the present embodiment, the shaft partition 145 separates the first flow path 161 and the second flow path 171 in such a manner that the first flow path 161 and the second flow path 171 are arranged in the axial direction AD. In this structure, similarly to the above-mentioned eleventh embodiment, it is not necessary to overlap the first flow path 161 and the second flow path 171 in the radial direction RD. Therefore, similarly to the above-mentioned eleventh embodiment, the heat dissipation effect of the inverter fins 92 in the second flow path 171 can be improved by the second airflow Fa2 that does not pass through the first flow path 161, and the fin cover 140 can be prevented from being enlarged in the radial direction RD.

[0197] <Other embodiments> The disclosure of this specification is not limited to the illustrated embodiments. The present disclosure includes the illustrated embodiments and the variations made by those skilled in the art based thereon. For example, the present disclosure is not limited to the combination of components and elements shown in the embodiments, and various variations can be made to implement it. The present disclosure can be implemented in various combinations. The present disclosure may have additional parts that can be added to the embodiments. The present disclosure includes a structure in which components and elements of the embodiments are omitted. The present disclosure includes the replacement or combination of components and elements between one embodiment and other embodiments. The technical scope of the present disclosure is not limited to the description of the embodiments. The technical scope of the present disclosure should be understood to be represented by the description of the claims, and also includes all variations in the meaning and scope equivalent to the description of the claims.

[0198] In the above-mentioned embodiments, as long as the heat of the stator 63 and the heat from the motor peripheral wall 71 can be released to the outside, the motor fin 72 can be arranged on the motor peripheral surface 70a in any manner. Similarly, as long as the heat of the switch module 83 and the heat from the inverter peripheral wall 91 can be released to the outside, the inverter fin 92 can be arranged on the inverter peripheral surface 90a in any manner. For example, the motor fin 72 and the inverter fin 92 can also extend in a direction inclined in the circumferential direction CD relative to the rotation axis Cm.

[0199] In each of the above-mentioned embodiments, the motor housing 70 may be provided on the downstream side of the inverter housing 90. For example, the motor housing 70 may be provided between the inverter housing 90 and the air supply fan 111 in the axial direction AD. In the EDS unit 130, the motor device 60 may be provided between the air supply fan 111 and the inverter device 80 in the axial direction AD, or the inverter device 80 may be provided between the air supply fan 111 and the motor device 60.

[0200] In each of the above-mentioned embodiments, the housing may be common to the motor device 60 and the inverter device 80. For example, the motor 61 and the drive unit 81 may be accommodated in one housing. In addition, the motor 61 and the drive unit 81 may not be accommodated in the housing of the EDS 50. In the housing, the heat generating body such as the motor 61 and the drive unit 81 may be accommodated.

[0201] In each of the above embodiments, the heating element can be placed in the housing or embedded in the housing. For example, in the inverter device 80, the switch module 83 can be embedded in the inverter outer peripheral wall 91. In this structure, the switch module 83 is arranged between the inverter outer peripheral surface 90a and the inverter inner peripheral surface 90b in the inverter housing 90.

[0202] In the above embodiments, the rotor axis may not coincide with the rotation axis Cm. That is, the rotation center of the rotor 20 may not be the rotation axis Cm. For example, the rotor axis may be located away from the rotation axis Cm in the radial direction RD, and may be inclined relative to the rotation axis Cm.

[0203] In the above-described embodiments, the airflow flowing through cover flow path 160 may be the flow of air generated by the rotation of at least blower fan 111 of rotor 20 and blower fan 111. For example, the air flowing by the rotation of rotor 20 may not flow through cover flow path 160.

[0204] In the above-mentioned embodiments, the drive device unit such as the EDS unit 130 may be a unit including a drive device such as the EDS 50 and a fan such as the air supply fan 111. For example, the drive device unit may include only the air supply fan 111 and the air supply fan 111 in the shroud 120. In addition, the drive device unit may be a unit including the rotor 20 in addition to the drive device and the fan.

[0205] In the above-mentioned embodiments, the fin cover 140 may be fixed to a housing such as the motor housing 70 by a fixing member such as a bolt. The fin cover 140 may not be elastically deformable. The fin cover 140 may be located radially away from the heat dissipation fins such as the motor fins 72. In addition, the shield 120 may be fixed to the fin cover 140. In addition, the fin cover 140 and the shield 120 may be formed integrally.

[0206] In each of the above-mentioned embodiments, the eVTOL 10 may not be a tilt-rotor aircraft. That is, in the eVTOL 10, the rotor 20 may not be tiltable. For example, in the eVTOL 10, the plurality of rotors 20 may include a rotor 20 for lifting and a rotor 20 for cruising. In the eVTOL 10, for example, the rotor 20 for lifting is driven when ascending, and the rotor 20 for cruising is driven when moving forward.

[0207] In the above-mentioned embodiments, the flying object equipped with the EDS 50 and the EDS unit 130 may not be a vertical take-off and landing machine. For example, the flying object may be a rotary wing aircraft or a fixed wing aircraft. In a rotary wing aircraft, the rotary wing is equivalent to the rotor. In a fixed wing aircraft, the propeller is equivalent to the rotor. In addition, the flying object may also be an unmanned aircraft without a person on board.

[0208] Disclosure of technical ideas This specification discloses multiple technical ideas recorded in the following multiple items. Some items are sometimes recorded by selectively referring to a multiple dependent form of a previous item in a subsequent item. In addition, some items are sometimes recorded by referring to a multiple dependent form of another multiple dependent form. These items recorded in multiple dependent forms define multiple technical ideas.

[0209] Technical Thought 1 A driving device, the driving device (50) being used to drive a rotor (20) of a flying object (10) to rotate, the driving device comprising: a heating portion (61, 81) which generates heat due to a drive for rotating the rotor; A housing (70, 90) having an outer peripheral surface (70a, 90a) extending along a rotation axis (Cm) of a fan (111, 111A) for flowing gas and accommodating the heat generating portion; an upstream fin (72), the upstream fin being disposed on the outer peripheral surface and releasing heat from the heat generating portion to the gas; a downstream fin (92) disposed on the outer peripheral surface at a position more downstream than the upstream fin in the gas flow in the axial direction (AD) relative to the rotation axis, and releasing heat from the heat generating portion to the gas; an outer shell (140) having a first flow path (161) provided with the upstream fins and a second flow path (171) provided with the downstream fins formed between the outer shell and the outer peripheral surface, and covering the outer peripheral surface in a manner that gas flows through the first flow path and the second flow path; and a first inlet (162) included in the first flow path and allowing gas to flow from the outside of the outer housing into the first flow path without passing through the second flow path; and A second inlet (172, 172A, 172B) is included in the second flow path and allows gas to flow from the outside of the outer housing into the second flow path without passing through the first flow path.

[0210] Technical Thought 2 Based on the driving device described in technical idea 1, The outer shell has: a first cover portion (145), the first cover portion covering the outer peripheral surface in a manner of forming the first flow path between the first cover portion and the outer peripheral surface; and A second cover portion (141) covers the first cover portion in a manner that forms the second flow path between the second cover portion and the first cover portion.

[0211] Technical Thought 3 Based on the driving device described in technical idea 2, the driving device includes: a first annular opening (162) as the first inlet, the first annular opening extending annularly along the outer peripheral surface in the circumferential direction (CD) of the rotation axis; and The second annular opening (172) serves as the second inlet, and the second annular opening extends annularly in the circumferential direction along the first cover portion.

[0212] Technical Thought 4 Based on the driving device described in technical idea 2 or 3, the driving device includes: A first axial opening (162) serving as the first inlet, the first axial opening being open in the axial direction; and The second axial opening (172) as the second inlet is provided on the outer peripheral side of the first inlet via the first cover portion and is open in the axial direction.

[0213] Technical Thought 5 Based on the driving device described in any one of technical ideas 2 to 4, wherein: It includes an intermediate flow outlet (163), which is at least partially arranged between the upstream fin and the downstream fin in the axial direction in the second cover portion, is contained in the first flow path, and allows the gas to flow from the first flow path to the outside of the outer shell cover without passing through the second flow path.

[0214] Technical Thought 6 Based on the driving device described in any one of technical ideas 2 to 5, The invention includes a second cover port (172A, 172B) as the second inlet port, wherein at least a portion of the second cover port is provided between the upstream fin and the downstream fin in the axial direction in the second cover portion.

[0215] Technical Thought 7 Based on the driving device described in any one of technical ideas 1 to 6, wherein: The outer shell has: a peripheral extension portion (141), the peripheral extension portion covering the outer peripheral surface in a manner of forming the first flow path and the second flow path between the peripheral extension portion and the outer peripheral surface; and A peripheral partition (147) is provided between the outer peripheral surface and the peripheral extension portion and partitions the first flow path and the second flow path in such a manner that the first flow path and the second flow path are aligned in a circumferential direction (CD) of the rotation axis.

[0216] Technical Thought 8 Based on the driving device described in any one of technical ideas 1 to 7, wherein: The outer shell has: a shaft extension portion (141), the shaft extension portion covering the outer peripheral surface in a manner such that the first flow path and the second flow path are formed between the shaft extension portion and the outer peripheral surface; and A shaft partition (145) is provided between the outer peripheral surface and the shaft extension portion and partitions the first flow path and the second flow path in such a manner that the first flow path and the second flow path are aligned in the axial direction.

[0217] Technical Thought 9 Based on the driving device described in any one of technical ideas 1 to 8, wherein: The second common port (172B) is provided as the second inlet, wherein at least a portion of the second common port is provided between the upstream fin and the downstream fin in the axial direction in the outer shell cover in such a manner that the inflowing gas flows along the downstream fin while merging with the gas flowing in from the first inlet and passing through the first flow path.

[0218] Technical Thought 10 Based on the driving device described in technical idea 9, the driving device includes: a second outflow port (173) included in the second flow path and allowing gas to flow out from the second flow path; and A downstream fan (111A) of the fan is provided on the downstream side of the second outlet and causes the gas to flow from the outside of the outer shell into the second common port as the gas flows out from the second outlet.

[0219] Technical Thought 11 Based on the driving device described in any one of technical ideas 1 to 10, wherein: The upstream fin is disposed at a position parallel to the first inlet in the axial direction. The downstream fin is provided at a position parallel to the second inlet in the axial direction.

[0220] Technical Thought 12 A driving device unit, the driving device unit (130) being installed on a flying object (10), and comprising: a driving device (50), the driving device being used to drive the rotor (20) of the flying body to rotate; and a fan (111, 111A), the fan rotating around a rotation axis (Cm) to transport gas, and arranged along the rotation axis with the driving device, The above-mentioned driving device has: a heating portion (63, 83) which generates heat due to a drive for rotating the rotor; A housing (70, 90), the housing having an outer peripheral surface (70a, 90a) extending along the rotation axis and accommodating the heat generating portion; an upstream fin (72), the upstream fin being disposed on the outer peripheral surface and releasing heat from the heat generating portion to the gas; a downstream fin (92) disposed on the outer peripheral surface at a position more downstream than the upstream fin in the gas flow in the axial direction (AD) relative to the rotation axis, and releasing heat from the heat generating portion to the gas; an outer shell (140) having a first flow path (161) provided with the upstream fins and a second flow path (171) provided with the downstream fins formed between the outer shell and the outer peripheral surface, and covering the outer peripheral surface in a manner that gas flows through the first flow path and the second flow path; and a first inlet (162) included in the first flow path and allowing gas to flow from the outside of the outer housing into the first flow path without passing through the second flow path; and A second inlet (172, 172A, 172B) is included in the second flow path and allows gas to flow from the outside of the outer housing into the second flow path without passing through the first flow path.

[0221] Technical Thought 13 Based on the driving device unit described in technical idea 12, The rotor rotates around the rotation axis.

[0222] Technical Thought 14 In the driving device unit according to technical idea 12 or 13, the rotor rotates so that the gas flows through the first flow path and the second flow path.

Claims

1. A driving device, the driving device (50) being used to drive a rotor (20) of a flying object (10) to rotate, the driving device comprising: a heat generating portion (63, 83) which generates heat due to a drive for rotating the rotor; a housing (70, 90) having an outer peripheral surface (70a, 90a) extending along a rotation axis (Cm) of a fan (111, 111A) for flowing gas and accommodating the heat generating portion; an upstream fin (72), the upstream fin being disposed on the outer peripheral surface and releasing heat from the heat generating portion to the gas; a downstream fin (92) provided on the outer peripheral surface at a position more downstream than the upstream fin in the gas flow in the axial direction (AD) relative to the rotation axis and releasing heat from the heat generating portion to the gas; an outer shell cover (140), the outer shell cover covering the outer peripheral surface so as to form a first flow path (161) provided with the upstream fins and a second flow path (171) provided with the downstream fins between the outer shell cover and the outer peripheral surface, and allowing gas to flow through the first flow path and the second flow path; as well as a first inlet (162) included in the first flow path and allowing gas to flow from the outside of the outer housing into the first flow path without passing through the second flow path; as well as A second inlet (172, 172A, 172B) is included in the second flow path and allows gas to flow from the outside of the outer housing into the second flow path without passing through the first flow path.

2. The driving device according to claim 1, characterized in that: The outer shell has: a first cover portion (145), the first cover portion covering the outer peripheral surface in a manner of forming the first flow path between the first cover portion and the outer peripheral surface; and A second cover portion (141) covers the first cover portion in a manner that the second flow path is formed between the second cover portion and the first cover portion.

3. The driving device according to claim 2, characterized in that: The driving device comprises: a first annular opening (162) as the first inlet, the first annular opening extending annularly along the outer peripheral surface in the circumferential direction (CD) of the rotation axis; and A second annular opening (172) serving as the second inlet extends annularly in the circumferential direction along the first cover portion.

4. The driving device according to claim 2 or 3, characterized in that: The driving device comprises: A first axial opening (162) serving as the first inlet, the first axial opening being open in the axial direction; and The second axial opening (172) is provided as the second inlet on the outer peripheral side of the first inlet via the first cover portion and is open in the axial direction.

5. The driving device according to claim 2, characterized in that: It includes an intermediate flow outlet (163), which is at least partially provided between the upstream fin and the downstream fin in the axial direction in the second cover portion and is contained in the first flow path, so that the gas flows out from the first flow path to the outside of the outer shell cover without passing through the second flow path.

6. The driving device according to claim 2, characterized in that: A second cover port (172A, 172B) as the second inflow port is provided, wherein at least a portion of the second cover port is provided between the upstream fin and the downstream fin in the axial direction in the second cover portion.

7. The driving device according to claim 1, characterized in that: The outer shell has: a peripheral extension portion (141), the peripheral extension portion covering the outer peripheral surface in a manner of forming the first flow path and the second flow path between the peripheral extension portion and the outer peripheral surface; as well as A peripheral partition (147) is provided between the outer peripheral surface and the peripheral extension portion and partitions the first flow path and the second flow path in such a manner that the first flow path and the second flow path are aligned in a circumferential direction (CD) of the rotation axis.

8. The driving device according to claim 1, characterized in that: The outer shell has: an axis extension portion (141), the axis extension portion covering the outer peripheral surface in a manner such that the first flow path and the second flow path are formed between the axis extension portion and the outer peripheral surface; as well as A shaft partition (145) is provided between the outer peripheral surface and the shaft extension portion and partitions the first flow path and the second flow path in such a manner that the first flow path and the second flow path are aligned in the axial direction.

9. The driving device according to claim 1, characterized in that: The invention comprises a second common port (172B) serving as the second inlet, wherein the second common port is provided with at least a portion between the upstream fin and the downstream fin in the axial direction in the outer shell cover in such a manner that the inflowing gas flows along the downstream fin while merging with the gas flowing in from the first inlet and passing through the first flow path.

10. The driving device according to claim 9, characterized in that The driving device comprises: a second outflow port (173) included in the second flow path and allowing gas to flow out from the second flow path; and A downstream fan (111A) as the fan is provided on the downstream side of the second outflow port and causes the gas to flow from the outside of the outer housing into the second common port as the gas flows out from the second outflow port.

11. The driving device according to claim 1, characterized in that: The upstream fin is disposed at a position parallel to the first inlet in the axial direction. The downstream fin is provided at a position parallel to the second inlet in the axial direction.

12. A driving device unit, the driving device unit (130) being installed on a flying object (10), the driving device unit comprising: A driving device (50), the driving device being used to drive the rotor (20) of the flying body to rotate; as well as a fan (111, 111A), the fan rotating around a rotation axis (Cm) to transport gas, and arranged along the rotation axis with the driving device, The driving device comprises: a heat generating portion (63, 83) which generates heat due to a drive for rotating the rotor; A housing (70, 90) having an outer peripheral surface (70a, 90a) extending along the rotation axis and accommodating the heat generating portion; an upstream fin (72), the upstream fin being disposed on the outer peripheral surface and releasing heat from the heat generating portion to the gas; a downstream fin (92) provided on the outer peripheral surface at a position more downstream than the upstream fin in the gas flow in the axial direction (AD) relative to the rotation axis and releasing heat from the heat generating portion to the gas; an outer shell cover (140), the outer shell cover covering the outer peripheral surface so as to form a first flow path (161) provided with the upstream fins and a second flow path (171) provided with the downstream fins between the outer shell cover and the outer peripheral surface, and allowing gas to flow through the first flow path and the second flow path; as well as a first inlet (162) included in the first flow path and allowing gas to flow from the outside of the outer housing into the first flow path without passing through the second flow path; as well as A second inlet (172, 172A, 172B) is included in the second flow path and allows gas to flow from the outside of the outer housing into the second flow path without passing through the first flow path.

13. The drive unit according to claim 12, characterized in that The rotor rotates around the rotation axis.

14. The drive unit according to claim 12 or 13, characterized in that The rotor rotates so that gas flows through the first flow path and the second flow path.

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