Mechatronic unit

Abstract

To miniaturize a mechatronics integrated unit.SOLUTION: A mechatronics integrated unit includes: a housing having a first chamber and a second chamber; at least one motor disposed in the first chamber; at least one gear mechanism disposed in the first chamber and connected to the at least one motor; an electric circuit unit disposed in the second chamber and electrically connected to the at least one motor; and an electric component disposed in the first chamber and electrically connected to the electric circuit unit. The electric component constitutes a power control circuit for controlling power supplied to the at least one motor together with at least part of the electric circuit unit.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The technology disclosed in this specification relates to an electromechanical unit for vehicles.

Background Art

[0002] Patent Document 1 discloses an electromechanical unit for vehicles. This electromechanical unit has a mechanical unit having a motor and a gear mechanism, and an electric circuit unit including a power control circuit, and the electric circuit unit is fixed above the mechanical unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described electromechanical unit, each of the mechanical unit and the electric circuit unit has an independent housing. In contrast, it is conceivable to reduce the size of the electromechanical unit by housing both the mechanical unit and the electric circuit unit in a common housing. However, even if a common housing is adopted, it is necessary to provide a chamber for housing the mechanical unit and a chamber for housing the electric circuit unit inside the housing respectively. Therefore, it is difficult to reduce the size of the electromechanical unit simply by adopting a common housing. This specification provides a novel and useful technology for reducing the size of the electromechanical unit.

Means for Solving the Problems

[0005] This specification discloses an electromechanical unit for a vehicle. The electromechanical unit includes a housing having a first chamber and a second chamber, at least one motor disposed in the first chamber, at least one gear mechanism disposed in the first chamber and connected to the at least one motor, an electric circuit unit disposed in the second chamber and electrically connected to the at least one motor, and an electrical component disposed in the first chamber and electrically connected to the electric circuit unit. The electrical component, together with at least a part of the electric circuit unit, constitutes a power control circuit for controlling the power supplied to the at least one motor.

[0006] In the above-described electromechanical unit, the housing has a first chamber and a second chamber, the motor and the gear mechanism are accommodated in the first chamber, and the electric circuit unit is accommodated in the second chamber. In addition, an electrical component that constitutes a part of the power control circuit is disposed in the first chamber together with the motor and the gear mechanism instead of the second chamber where the electric circuit unit is disposed. According to such a configuration, only the size of the electrical component disposed in the first chamber can reduce the second chamber. In the first chamber where the motor and the gear mechanism are disposed, an excess space is likely to be formed due to the shape based on the circle of the motor and the gear mechanism. By utilizing the excess space, the electrical component can be disposed in the first chamber without particularly expanding the first chamber. Thereby, the miniaturization of the electromechanical unit can be achieved.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0008] In one embodiment of the present technology, the electrical component may be a reactor. However, in other embodiments, the electrical component is not limited to a reactor, and may be other electrical components constituting the power control circuit.

[0009] In addition to the above configuration, the power control circuit may have a boost converter and an inverter. In this case, the boost converter may boost the DC power from the vehicle power supply and supply it to the inverter, and the inverter may convert the DC power from the boost converter into AC power and supply it to the motor. In addition, the reactor may constitute a part of the boost converter. According to such a configuration, the reactor is separated from the converter circuit of the boost converter. Thereby, the electromagnetic noise that may occur between the reactor and the converter circuit is reduced.

[0010] In one embodiment of the present technology, the second chamber may be located above the first chamber, and at least one motor may have the first motor and the second motor. In this case, the first motor and the second motor are arranged along the longitudinal direction of the vehicle, and a part of the second motor may be located above the first motor, and at least a part of the electric circuit unit may face the second motor in the longitudinal direction or the lateral direction of the vehicle. According to such a configuration, at least a part of the electric circuit unit can be arranged in the surplus space that may be generated by the arrangement of the first motor and the second motor. Therefore, the dimensions of the electromechanical unit in the vertical direction of the vehicle can be reduced by the amount that the electric circuit unit is embedded in the surplus space of the first motor and the second motor.

[0011] In addition to the above configuration, the electric circuit unit may include a first electric circuit unit and a second electric circuit unit located below the first electric circuit unit. In this case, both the first electric circuit unit and the second electric circuit unit may be located above the first motor, and above the second motor, the first electric circuit unit may be located while the second electric circuit unit may not be located. According to such a configuration, only the first electric circuit unit is located on the second motor, and compared with the case where the second electric circuit unit is located on the second motor, the dimensions of the mechatronic unit in the vertical direction of the vehicle can be reduced.

[0012] In one embodiment of the present technology, the housing may include a housing body having an opening at the upper part and a cover plate attached to the opening. In this case, the first electric circuit unit may be fixed to the cover plate. According to such a configuration, the components supporting the first electric circuit unit can be shared with the cover plate of the housing. Thereby, the configuration of the mechatronic unit is simplified, and the assembly work of the mechatronic unit can also be simplified. Further, since the housing has relatively high rigidity, when the first electric circuit unit is attached to the cover plate of the housing, the first electric circuit unit is firmly held by the high rigidity of the housing.

[0013] In one embodiment of the present technology, the second electric circuit unit may include a step-down converter that steps down the DC power from the vehicle power source and supplies it to the vehicle auxiliary battery. According to such a configuration, the step-down converter can also be included in the surplus space of the mechatronic unit, the space in the passenger compartment can be saved, the step-down converter can be close to the power control circuit, and the power wiring can be simplified.

[0014] In one embodiment of the present technology, the first chamber may be configured such that lubricating oil circulates. According to such a configuration, the electric components can be cooled by the lubricating oil.

[0015] (Embodiment) Referring to the drawings, the mechatronic unit 10 of the embodiment will be described. As shown in FIGS. 1 to 3, the mechatronic unit 10 is mounted on the vehicle 100. The vehicle 100 includes an engine 2, a power source 4, the mechatronic unit 10, a plurality of wheels 6, and an auxiliary battery 8. The mechatronic unit 10 includes a plurality of driving motors 12, 13 for running. The engine 2 and the plurality of driving motors 12, 13 are driving devices that drive at least one of the plurality of wheels 6. The power source 4 supplies power for driving the wheels 6 to the plurality of driving motors 12, 13 respectively. The plurality of driving motors 12, 13 include a first motor 12 and a second motor 13. Therefore, the vehicle 100 of the present embodiment is a so-called two-motor type hybrid vehicle. However, the vehicle 100 is not limited to a hybrid vehicle, and may be a vehicle having a driving motor such as an electric vehicle or a fuel vehicle, for example. Also, the number of the driving motors 12, 13 is not limited to two, and may be one or three or more.

[0016] Here, each direction of the mechatronic unit 10 in the drawings conforms to the direction when mounted on the vehicle 100, that is, the direction of the vehicle 100. Therefore, the direction FR indicates the front in the longitudinal direction of the vehicle 100, and the direction RR indicates the rear in the longitudinal direction of the vehicle 100. Also, the direction LH indicates the left in the left-right direction of the vehicle 100, and the direction RH indicates the right in the left-right direction of the vehicle 100. And the direction UP indicates the upper side in the up-down direction of the vehicle 100, and the direction DW indicates the lower side in the up-down direction of the vehicle 100.

[0017] As shown in FIGS. 1 to 3 (mainly FIG. 3), in addition to the plurality of driving motors 12, 13 described above, the mechatronic unit 10 includes electric circuit units 36a, 36b, a reactor 28, a plurality of gear mechanisms 14, 15, 16, 17, a plurality of oil pumps 18, 19, and a housing 42. The vehicle 100 can drive the left and right wheels 6 via the plurality of gear mechanisms 14, 15, 16, 17 by the power from the engine 2 and / or the plurality of driving motors 12, 13.

[0018] The housing 42 has a first chamber R1 and a second chamber R2. The second chamber R2 is located above the first chamber R1. In the first chamber R1, a plurality of traveling motors 12, 13, a plurality of gear mechanisms 14, 15, 16, 17, a reactor 28, and a plurality of oil pumps 18, 19 (not shown in FIG. 3) are arranged. In the second chamber R2, electric circuit units 36a, 36b are arranged. The reactor 28 is electrically connected to the electric circuit units 36a, 36b.

[0019] The electric circuit units 36a, 36b include a first electric circuit unit 36a and a second electric circuit unit 36. The first electric circuit unit 36a includes a DC-DC converter circuit 26, a plurality of inverter circuits 22, 24, a plurality of capacitors 30, 31, and a cooler 38. The cooler 38 is arranged adjacent to at least the DC-DC converter circuit 26 and the plurality of inverter circuits 22, 24. The cooler 38 circulates cooling water to cool the DC-DC converter circuit 26 and the plurality of inverter circuits 22, 24. The DC-DC converter circuit 26, the plurality of inverter circuits 22, 24, and the plurality of capacitors 30, 31, together with the reactor 28 arranged in the first chamber R1, constitute a power control circuit 20. The power control circuit 20 controls the power supplied from the power source 4 to the plurality of traveling motors 12, 13.

[0020] The DC-DC converter circuit 26 and the reactor 28 constitute a boost converter circuit 25. The boost converter circuit 25 is connected between the power source 4 and the plurality of inverter circuits 22, 24. The boost converter circuit 25 boosts the DC power from the power source 4 and supplies the boosted power to each of the inverter circuits 22, 24. The DC-DC converter circuit 26 has two switching elements 26s. One end of one switching element 26s is connected to the negative electrode 4b of the power source 4. The other end of one switching element 26s is connected to one end of the other switching element 26s. The other end of the other switching element 26s is connected to the positive electrode 4a of the power source 4 via the reactor 28.

[0021] Although not particularly limited, the switching element 26s of the DC-DC converter circuit 26 is an RC-IGBT (Reverse conducting Insulated Gate Bipolar Transistor) element. That is, the switching element 26s has an IGBT structure and a diode structure connected in antiparallel thereto. One end of the above-described switching element 26s is connected to the emitter of the IGBT structure and the anode of the diode structure, and the other end of the switching element 26s is connected to the collector of the IGBT structure and the cathode of the diode structure. However, the switching element 26s is not limited to an RC-IGBT element, and may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) element or other types of switching elements.

[0022] The plurality of inverter circuits 22, 24 include a first inverter circuit 22 and a second inverter circuit 24. The first inverter circuit 22 and the second inverter circuit 24 are connected in parallel with each other. The first inverter circuit 22 includes six switching elements 22s and is a three-phase AC inverter circuit. The first inverter circuit 22 is connected between the boost converter circuit 25 and the first motor 12. The first inverter circuit 22 converts DC power from the boost converter circuit 25 into AC power and supplies it to the first motor 12. The second inverter circuit 24, similarly to the first inverter circuit 22, includes six switching elements (not shown) and is a three-phase AC inverter circuit. The second inverter circuit 24 is connected between the boost converter circuit 25 and the second motor 13. The second inverter circuit 24 converts DC power from the boost converter circuit 25 into AC power and supplies it to the second motor 13. Although not particularly limited, the switching elements 22s of each inverter circuit 22, 24 employ the same ones as the switching element 26s employed in the boost converter circuit 25.

[0023] The plurality of capacitors 30, 31 include a first capacitor 30 and a second capacitor 31. The first capacitor 30 is connected between the power supply 4 and the boost converter circuit 25, and the second capacitor 31 is connected between the boost converter circuit 25 and the plurality of inverter circuits 22, 24. Each of the capacitors 30, 31 is a capacitance capacitor.

[0024] The second electric circuit unit 36b includes a step-down converter circuit 32 and a cooler 40. The step-down converter circuit 32 steps down the DC power of the power control circuit 20 and supplies it to the auxiliary battery 8 of the vehicle 100. The step-down converter circuit 32 includes a DC-DC converter circuit and can be configured in the same manner as the boost converter circuit 25. The cooler 40 is arranged adjacent to the step-down converter circuit 32 in the front-rear direction. The cooler 40 circulates cooling water to cool the step-down converter circuit 32. The rated voltage of the auxiliary battery 8 is 12 volts. The auxiliary battery 8 is connected to various control systems and other auxiliary devices of the vehicle 100 and supplies power to them.

[0025] Here, referring to FIG. 1, a plurality of gear mechanisms 14, 15, 16, 17 arranged in the first chamber R1 will be described. Each of the plurality of gear mechanisms 14, 15, 16, 17 is configured on the corresponding axles S1 to S4. Each of the axles S1 to S4 is arranged along the left-right direction. The first motor 12 is arranged on the first axle S1, and the second motor 13 is arranged on the third axle S3. The plurality of gear mechanisms 14, 15, 16, 17 include a planetary gear mechanism 14, a reduction gear mechanism 15, a motor output gear mechanism 16, and a differential gear mechanism 17. Note that the number of gear mechanisms is not limited to a plurality, and the mechatronic unit 10 may have at least one gear mechanism.

[0026] The planetary gear mechanism 14 is configured along the first axle S1 and includes a sun gear 14s, a ring gear 14r, a plurality of planetary gears 14p, and a carrier 14c. The sun gear 14s is an external gear. The ring gear 14r is an internal gear arranged coaxially with the sun gear 14s. The plurality of planetary gears 14p are external gears located between the sun gear 14s and the ring gear 14r and are configured to mesh with the sun gear 14s and the ring gear 14r. The carrier 14c is connected to each of the plurality of planetary gears 14p and holds the plurality of planetary gears 14p rotatably and revolvably. The carrier 14c is connected to the first axle S1 connected to the engine 2, the first motor 12 is connected to the sun gear 14s, and a drive gear 14d is provided on the outer peripheral edge of the ring gear 14r.

[0027] The reduction gear mechanism 15 is configured along the second axle S2 and includes a first reduction gear 15a and a second reduction gear 15b having a smaller diameter dimension than the first reduction gear 15a. The first reduction gear 15a and the second reduction gear 15b are arranged coaxially (i.e., on the second axle S2). The first reduction gear 15a is arranged to mesh with the drive gear 14d of the planetary gear mechanism 14.

[0028] The motor output gear mechanism 16 is configured along the third axle S3 and includes a motor output gear 16m. The motor output gear 16m is arranged to mesh with the first reduction gear 15a of the reduction gear mechanism 15. The third axle S3 is connected to the second motor 13.

[0029] The differential gear mechanism 17 is configured along the fourth axle S4 and includes a differential ring gear 17d and a compound gear 17m. The differential ring gear 17d is arranged to mesh with the second reduction gear 15b of the reduction gear mechanism 15. The power of the second reduction gear 15b of the reduction gear mechanism 15 is input to the compound gear 17m via the differential ring gear 17d. On the fourth axle S4, the compound gear 17m is connected to the left and right wheels 6 and outputs the power input to the compound gear 17m to the left and right wheels 6.

[0030] A plurality of oil pumps 18, 19 circulate lubricating oil in the first chamber R1. By circulating the lubricating oil, a plurality of traveling motors 12, 13, etc. provided in the first chamber R1 can be cooled. In this embodiment, a reactor 28 which is a part of the power control circuit 20 is arranged in the first chamber R1, and the reactor 28 can also be cooled by the circulating oil. The plurality of oil pumps 18, 19 include a first oil pump 18 and a second oil pump 19. The first oil pump 18 is connected to the engine 2 and is driven by the power of the engine 2. The second oil pump 19 has a pump drive gear 19p. The pump drive gear 19p is connected to the differential ring gear 17d of the differential gear mechanism 17. Therefore, the second oil pump 19 is driven when the wheels 6 rotate (i.e., when the vehicle 100 travels).

[0031] Here, the details of the housing 42 will be described. The housing 42 is a housing member. The housing 42 has a housing main body 44 and a cover plate 46. The housing main body 44 has a bottom wall 44a and four side walls 44b extending upward from the outer peripheral edge of the bottom wall 44a. The housing main body 44 has an opening 44c at the upper part. The opening 43c of the housing main body 44 is defined by the four side walls 44b. The housing main body 44 has a partition wall 44w. In the housing 42, the first chamber R1 and the second chamber R2 are defined by the partition wall 44w. The housing main body 44 is made of a conductive material such as aluminum, for example.

[0032] The cover plate 46 is attached to the opening 44c. The cover plate 46 closes the opening 44c of the housing body 44. The cover plate 46 is a plate-shaped member and is made of a conductor material such as aluminum. The first electric circuit unit 36a is fixed to the cover plate 46. Although not particularly limited, a plurality of inverter circuits 22, 24 and a DC-DC converter circuit 26 are arranged on the lower surface of the cover plate 46, and a control board 47 connected to the plurality of inverter circuits 22 and the DC-DC converter circuit 26 is arranged on the upper surface of the cover plate 46. The control board 47 has components such as a processor incorporating a CPU and a memory, and controls the switching elements 22s, 26s of the inverter circuits 22, 24 and the DC-DC converter circuit 26. A protective cover 48 is provided on the cover plate 46. The protective cover 48 covers the control board 47 located on the upper surface of the cover plate 46.

[0033] Next, with reference to FIGS. 3 to 4, the arrangement of the electric circuit units 36a, 36b in the housing 42 and the plurality of traveling motors 12, 13 will be described. As shown in FIG. 3, in the first chamber R1 of the housing 42, the first motor 12 and the second motor 13 are arranged along the front-rear direction. A part (upper part) of the second motor 13 is located above the first motor 12. In the second chamber R2 of the housing 42, the second electric circuit unit 36b is located below the first electric circuit unit 36a. The first electric circuit unit 36a and the second electric circuit unit 36b are arranged in an overlapping manner. Above the first motor 12, both the first electric circuit unit 36a and the second electric circuit unit 36b are located. Above the second motor 13, the first electric circuit unit 36a is located while the second electric circuit unit 36b is not located. According to such a configuration, only the first electric circuit unit 36a is located on the second motor 13, and the dimensions of the mechatronic unit 10 in the vertical direction of the vehicle 100 can be reduced as compared with the case where the second electric circuit unit 36b is located on the second motor 13.

[0034] As shown in FIG. 4, the second electric circuit unit 36 generally has an L shape when viewed in plan. The second electric circuit unit 36b faces the second motor 13 with the partition wall 44w of the housing 42 interposed therebetween. The second electric circuit unit 36b has a portion facing the second motor 13 in the front-rear direction and a portion facing the second motor 13 in the left-right direction.

[0035] In the electromechanical integrated unit, each of the mechanical units such as the traveling motor and the gear mechanism described above and the electric circuit unit has an independent housing. On the other hand, it is conceivable to reduce the size of the electromechanical integrated unit by housing both the mechanical unit and the electric circuit unit in a common housing. However, even if a common housing is adopted, it is necessary to provide a chamber for housing the mechanical unit and a chamber for housing the electric circuit unit inside the housing, respectively. Therefore, it is difficult to reduce the size of the electromechanical integrated unit simply by adopting a common housing.

[0036] In order to solve the above problems, in the electromechanical unit 10 of this embodiment, the housing 42 has a first chamber R1 and a second chamber R2, and a plurality of traveling motors 12, 13 and a plurality of gear mechanisms 14, 15, 16, 17 are accommodated in the first chamber R1, while the electric circuit units 36a, 36b are accommodated in the second chamber R2. In addition, a reactor 28 that forms part of the power control circuit 20 is arranged in the first chamber R1 together with the plurality of traveling motors 12, 13 and the plurality of gear mechanisms 14, 15, 16, 17 instead of the second chamber R2 where the electric circuit units 36a, 36b are arranged. According to such a configuration, only the size of the reactor 28 arranged in the first chamber R1 can reduce the second chamber R2. In the first chamber R1 where the plurality of traveling motors 12, 13 and the plurality of gear mechanisms 14, 15, 16, 17 are arranged, due to the shape based on the circles of the plurality of traveling motors 12, 13 and the plurality of gear mechanisms 14, 15, 16, 17, an excess space is likely to be formed. By utilizing the excess space, the reactor 28 can be arranged in the first chamber R1 without particularly enlarging the first chamber R1. Thereby, the miniaturization of the electromechanical unit 10 can be achieved.

[0037] As described above, in this embodiment, in particular, a reactor 28 that forms part of the boost converter circuit 25 is provided in the first chamber R1 of the housing 42. According to such a configuration, the reactor 28 is separated from the DC-DC converter circuit 26 of the boost converter circuit 25. Thereby, the electromagnetic noise that may occur between the reactor 28 and the DC-DC converter circuit 26 is reduced.

[0038] Here, the reactor 28 is an example of an "electric component" in the technology disclosed in this specification. However, in other embodiments, the electric component arranged in the first chamber R1 is not limited to the reactor 28, and other electric components constituting the power control circuit 20 may also be used.

[0039] In this embodiment, the first motor 12 and the second motor 13 are arranged along the longitudinal direction of the vehicle 100. In addition, a part of the second motor 13 is located above the first motor 12, and the second electric circuit unit 36b faces the second motor 13 in the longitudinal direction or the lateral direction of the vehicle 100. According to such a configuration, the second electric circuit unit 32b can be arranged in the surplus space that may be generated by the arrangement of the first motor 12 and the second motor 13. Therefore, the size of the mechatronic unit 10 in the vertical direction of the vehicle 100 can be reduced by the amount that the second electric circuit unit 32b is embedded in the surplus space of the first motor 12 and the second motor 13.

[0040] The second electric circuit unit 38b in this embodiment has a step-down converter circuit 32 that steps down the DC power from the power source 4 of the vehicle 100 and supplies it to the auxiliary battery 8 of the vehicle 100. According to such a configuration, the step-down converter circuit 32 can also be included in the surplus space of the mechatronic unit 10, the space in the passenger compartment can be saved, and the step-down converter circuit 32 can be close to the power control circuit 20, simplifying the power wiring.

[0041] In this embodiment, the housing 42 has a housing body 44 having an opening 44c at the upper part and a cover plate 46 attached to the opening 44c, and the first electric circuit unit 38a is fixed to the cover plate 46. According to such a configuration, the components that support the first electric circuit unit 36a can be shared with the cover plate 46 of the housing 42. Thereby, the configuration of the mechatronic unit 10 is simplified, and the assembly work of the mechatronic unit 10 can also be simplified.

[0042] As described above, specific examples of the technology disclosed in this specification have been described in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples exemplified above. The technical elements described in this specification or the drawings exhibit technical utility either alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology exemplified in this specification or the drawings can achieve multiple purposes simultaneously, and achieving one of these purposes itself has technical utility.

Description of Reference Numerals

[0043] 2: Engine 4: Power source 6: Wheel 8: Auxiliary battery 10: Mechatronics unit 12, 13: Traction motor 14, 15, 16, 17: Gear mechanism 18, 19: Oil pump 20: Power control circuit 22, 24: Inverter circuit 25: Boost converter circuit 26: DC - DC converter circuit 28: Reactor 30, 31: Capacitor 32: Buck converter circuit 36a, 36b: Electric circuit unit 38, 40: Cooler 42: Housing 44: Housing body 44c: Opening 44w: Partition wall 46: Cover plate R1: First chamber R2: Second chamber

Claims

1. An electromechanical unit for a vehicle, comprising: a housing having a first chamber and a second chamber located above the first chamber; a first motor and a second motor disposed in the first chamber; at least one gear mechanism disposed in the first chamber and connected to the at least one motor; an electric circuit unit disposed in the second chamber and electrically connected to the at least one motor; an electrical component disposed in the first chamber and electrically connected to the electric circuit unit, wherein the electrical component, together with at least a part of the electric circuit unit, constitutes a power control circuit for controlling power supplied to the at least one motor; the first motor and the second motor are arranged along the longitudinal direction of the vehicle, and a part of the second motor is located above the first motor; the electric circuit unit has a first electric circuit unit and a second electric circuit unit located below the first electric circuit unit; a part of the second electric circuit unit faces the second motor in the longitudinal direction of the vehicle; another part of the second electric circuit unit faces the second motor in the lateral direction of the vehicle; both the first electric circuit unit and the second electric circuit unit are located above the first motor; the first electric circuit unit is located above the second motor while the second electric circuit unit is not located above the second motor; the electromechanical unit.

2. The electromechanical unit according to claim 1, wherein the electrical component is a reactor.

3. The power control circuit has a boost converter and an inverter, the boost converter boosts the DC power from the vehicle power source and supplies it to the inverter, the inverter converts the DC power from the boost converter into AC power and supplies it to the at least one motor, the reactor constitutes a part of the boost converter; the electromechanical unit according to claim 2.

4. The housing has a housing body having an opening at the top and a cover plate attached to the opening, the first electric circuit unit is fixed to the cover plate; the electromechanical unit according to any one of claims 1 to 3.

5. The electromechanical integrated unit according to any one of claims 1 to 4, wherein the second electric circuit unit includes a step-down converter that steps down DC power from a power source of the vehicle and supplies the power to an auxiliary battery of the vehicle.

6. The electromechanical integrated unit according to any one of claims 1 to 5, wherein the first chamber is configured such that lubricating oil circulates therein.

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