JP2014043124A - Inverter arrangement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for achieving a structure where destruction of insulation between a casing and an internal circuit caused by collision shocks is difficult at low cost regarding an electric vehicle inverter.SOLUTION: In the arrangement structure of an inverter 2, in the arrangement of an engine compartment 90a, the thick part of an insulation film is positioned in the inner surface of an inverter casing facing an auxiliary machine such as a radiator 96 having a metal casing and an engine 94, and the thin part of the insulation film is positioned in the inner surface of the inverter casing facing an auxiliary machine such as a relay box 97 having a resin casing. The thick part of the insulation film is positioned in a part contacted with a high-hardness member such as an auxiliary machine having a metal casing. Thus, insulation destruction is difficult to occur even when collision shocks cause destruction or deformation of the casing or removal of an internal high-voltage circuit. In a part contacted with a low-hardness member such as an auxiliary machine having a resin casing, the thin part of the insulation film is positioned to reduce the amount of a used insulation material.

Description

  The technology disclosed in this specification relates to an arrangement structure in a vehicle of an inverter that supplies AC power to a traveling motor. The “inverter” in the present specification may include not only an inverter circuit that converts direct current into alternating current but also other circuits such as a voltage converter.

  For example, Patent Document 1 discloses a technique related to a device that accommodates a circuit that generates a high voltage. In this technology, the outer wall surface of a high-pressure box (housing) in which a voltage control unit or the like is built is guarded by a strength member to protect the high-voltage terminal block in the high-voltage box from a collision in the longitudinal direction of the vehicle.

JP 2004-181979 A

  The technology of Patent Document 1 protects an internal circuit by increasing the strength of the housing itself. However, the casing may be damaged / deformed due to the impact of the collision or the internal high voltage circuit may be unfixed even if the casing itself is not damaged. Generally, the housing of a high-voltage device is made of metal in order to ensure strength. If an internal high-voltage circuit comes into contact with the housing, there is a risk of electric leakage. The present specification relates to a device for handling a high voltage mounted on a vehicle having a motor for traveling, in particular, an inverter that supplies AC power to the motor for traveling, insulatively between a casing and an internal circuit due to impact of a collision. Provide a technology that realizes an arrangement structure that does not easily break down at low cost.

  In the inverter arrangement structure disclosed in the present specification, the inverter has a metal casing on the inner surface of the side wall (surface on the inner side of the casing), and a thick portion having a thickness equal to or greater than a predetermined thickness and a predetermined thickness. An insulating film having a thin thin portion. And in the arrangement of the inverter in the vehicle, the thick part of the insulating film is located on the inner surface of the side wall of the inverter housing facing the auxiliary machinery having a metal housing, the engine, the traveling motor, or the vehicle body frame. A thin portion of the insulating film is located on the inner surface of the side wall facing the auxiliary machine having a resin casing. For this reason, even if an impact due to a collision may be applied to the inverter, the casing of a part that can come into contact with a high hardness object such as an auxiliary machine having a metal casing has a thick insulating film on its inner surface. Therefore, even if the casing is damaged or deformed, or even if the high voltage circuit accommodated in the casing is unfixed, dielectric breakdown is unlikely to occur. On the other hand, even in the case of a part that can come into contact with a low-hardness machine such as an auxiliary machine having a resin-made housing softer than metal, the impact is small even if an impact due to a collision is applied. Therefore, the amount of the insulating material used to form the insulating film is reduced by positioning the thin part of the insulating film thinner than the thick part on the inner surface of the housing. As a result, a structure in which insulation breakdown between the housing and the circuit in the housing is unlikely to occur is realized at low cost.

  The inverter is mounted in a space where a drive source is arranged, such as an engine or a motor. Hereinafter, in this specification, even in an electric vehicle that does not have an engine, a vehicle interior space in which a traveling motor corresponding to the engine is disposed is referred to as an “engine compartment” for convenience. The inverter is installed in the engine compartment.

  In the inverter arrangement structure described above, the inverter may be positioned at substantially the same height in the direction of gravity with respect to the auxiliary machines having a metal or resin casing, the engine, the traveling motor, or the vehicle body frame. . If the height in the direction of gravity is substantially the same, the possibility of contact with these increases, so it is more desirable to adopt the above arrangement structure.

  In the inverter arrangement structure described above, when the inverter casing is composed of a casing body and a lid, the insulating film is composed of rubber or a rubber-based material and is interposed between the casing body and the lid. May be. As a result, the rubber or rubber-based insulating film interposed between the casing body and the lid functions as a sealing member, and thus prevents gas, liquid, dust, and the like from entering the casing.

  Details of the technology disclosed in this specification and further improvements will be described in the embodiments of the present invention.

It is a typical perspective view which shows the example of arrangement | positioning in an engine compartment. It is a typical top view which shows the example of arrangement | positioning in an engine compartment. It is a disassembled perspective view of the inverter of an Example. It is a perspective view of the inverter of an Example. It is a fragmentary sectional view of the inverter of an Example. It is typical explanatory drawing which shows an example of the application | coating range of an insulating film. It is typical explanatory drawing which shows the other example of the application | coating range of an insulating film.

  An inverter arrangement structure of an embodiment will be described with reference to the drawings. First, an arrangement example in an engine compartment of a hybrid vehicle to which the inverter arrangement structure of the embodiment is applied will be described with reference to FIGS. 1 and 2. FIG. 1 shows a schematic perspective view of an arrangement example in the engine compartment, and FIG. 2 shows a schematic plan view thereof. In all the drawings, the positive direction of the X axis corresponds to the front of the vehicle (the negative direction is the rear of the vehicle), the Y axis corresponds to the width direction of the vehicle, and the Z axis corresponds to the vertical direction of the vehicle.

  The body 90 of the vehicle 100 is provided with an engine compartment 90a at the front thereof. The engine compartment 90a may be referred to as a front compartment with respect to a rear compartment (luggage room) provided at the rear of the vehicle. An engine 94, a drive train 95, a radiator 96, a relay box 97, a sub-battery 98, an air conditioner compressor 99, an inverter 2, and the like are mounted on the engine compartment 90a. These are fixed to frames such as the side frame 91 and the front frame 92.

  Since the vehicle 100 is a hybrid vehicle, an engine 94 and a traveling motor are mounted as sources of driving force. The traveling motor is accommodated in the drive train 95. The drive train 95 includes a traveling motor, a planetary gear, and a differential gear, and fuses / distributes driving forces generated from the engine 94 and the traveling motor, respectively. The engine 94 and the drive train 95 are disposed substantially at the center of the engine compartment 90a. An inverter 2 described later is fixed on the upper surface of the drive train 95.

  The radiator 96 is disposed in the forefront of the engine compartment 90a, that is, in front of the inverter 2 relative to the inverter 2. Relay box 97 is arranged on the right side of inverter 2 (the left seat side of vehicle 100). The sub-battery 98 and the air-conditioning compressor 99 are arranged behind the last row of the engine compartment 90a, that is, the vehicle 2 behind the inverter 2 so as to be sandwiched between the suspension towers 93 of the left and right front wheels. The drive train 95, the radiator 96, and the air conditioner compressor 99 are covered with a metal casing, and the relay box 97 and the sub-battery 98 are covered with a resin casing.

  The main battery that supplies driving power to the traveling motor is disposed not in the engine compartment 90a but in the rear compartment or under the rear seat. The inverter 2 converts DC power output from the main battery into AC power and supplies driving power to the traveling motor. 3 is an exploded perspective view of the inverter 2, FIG. 4 is a perspective view of the inverter 2, and FIG. 5 is a partial cross-sectional view of the inverter 2.

  The inverter 2 mainly has an inverter circuit and a voltage converter circuit. The semiconductor multilayer unit 10, the terminal block 13, the capacitors 31 and 33, the reactor 32, the control board 34, and the like constituting these circuits are accommodated in the housing 20.

  The semiconductor laminated unit 10 has a structure in which a plurality of semiconductor modules 12 in which switching elements (for example, IGBTs) are resin-molded into a flat plate shape and a plurality of flat plate cooling plates 15 through which a coolant passes are alternately laminated. The semiconductor module 12 constitutes a switching circuit such as an inverter circuit or a voltage converter circuit, and generates a large amount of heat because a large current flows. For this reason, the switching element is molded into a flat plate shape with a resin and sandwiched between the cooling plates 15 to enable effective cooling. The output of the inverter circuit can be output to the outside via the terminal block 13.

  The reactor 32 is an inductor that constitutes a voltage converter circuit together with the switching element of the semiconductor module 12. Capacitors 31 and 33 are capacitors for smoothing the current flowing through the circuit. The capacitor 31 is connected in parallel to the input end of the voltage converter, and the capacitor 33 is connected in parallel to the output end of the voltage converter (input end of the inverter circuit). Connected. Capacitors 31 and 33 have large capacities.

  A control board 34 for controlling the switching elements is placed above the semiconductor laminated unit 10 and the reactor 32, and electronic components such as semiconductor chips constituting the control circuit are mounted on the board. The control signal line 14 extending above the semiconductor module 12 and the current sensor signal line 19 extending from the sensor circuit board 18 disposed on the upper surface of the terminal block 13 are connected to the control board 34. The control board 34 generates a PWM signal based on the sensor data of the current sensor built in the terminal block 13 and outputs the PWM signal to the semiconductor module 12 so that the inverter circuit has a predetermined output.

  The housing 20 is an aluminum die-cast metal housing that houses the semiconductor multilayer unit 10, terminal block 13, capacitors 31 and 33, reactor 32, control board 34, and the like, and includes a case 21 and a cover 25. High voltage is handled in the semiconductor laminated unit 10 housed in the housing 20, especially in a voltage converter circuit that boosts the voltage input from the main battery to a high voltage of 500V or higher and an inverter circuit that converts this output into AC power. . For this reason, if a circuit that handles these high voltages comes into contact with the inner surface of the metal housing 20, there is a risk of leakage through the housing 20. Therefore, in the housing 20, an insulating film is formed on the inner surface to ensure electrical insulation between these circuits and the housing 20. It should be noted that this insulating film is not shown in FIGS. 3 and 4 and is described in FIGS.

  The case 21 is a deep container having a rectangular opening. When the case 21 is disposed in the engine compartment 90a, the case 21 faces the front wall 21a and the front wall 21a that are located in the front when viewed from the front to the rear of the vehicle 100 (in the positive to negative direction of the X axis). Rear wall 21b, right wall 21c located on the right side of the front wall 21a (Y-axis positive direction, left seat side of the vehicle 100), left side of the front wall 21a (Y-axis negative direction, right side of the vehicle 100) It has a left wall 21d that is positioned and a lower wall 21e that forms a bottom surface and contacts the drive train 95. Around the opening of the case 21, a band-like flange 22 is formed that extends substantially parallel to the lower wall 21 e. The flange 22 is formed with extended portions 22a at a predetermined interval, and the extended portion 22a is formed with a bolt hole penetrating therethrough. An opening 23 is formed in the right wall 21c near the bottom of the case 21 so that the connection end surface of the terminal block 13 can be exposed to the outside.

  The cover 25 is a lid that has a rectangular opening like the case 21 and is configured to be able to close the opening of the case 21. The front wall 25a, the rear wall 25b, the right wall 25c, the left wall 25d, and the upper wall 25e are provided so as to correspond to the front wall 21a and the like of the case 21, respectively. The front wall 25a, the rear wall 25b, the right wall 25c, and the left wall 25d are formed so that the bottom becomes shallower. A band-like flange 26 that extends substantially parallel to the upper wall 25e is also formed around the opening of the cover 25 so that the opening of the case 21 is aligned with the flange 22 when the opening of the case 21 is closed by the cover 25. Moreover, the bolt hole which can be connected with the bolt hole of case 21 is penetrated and formed in the expansion part 26a located in a predetermined space | interval.

  FIG. 4 shows a state in which the case 21 containing the semiconductor laminated unit 10 and the like is closed with a cover 25 and the flange 22 of the case 21 and the flange 26 of the cover 25 are screwed together with bolts 29. In FIG. 4, it should be noted that the semiconductor laminated unit 10 and the like housed in the housing 20 are drawn with broken lines, and the control board 34 is not shown.

  A high voltage is generated in the semiconductor laminated unit 10 and the like housed in the housing 20. In particular, the voltage converter circuit is a circuit that boosts the voltage to a high voltage of 500 V or higher, and the inverter circuit that converts this output into AC power handles the high voltage. Therefore, the inner surface of the housing 20, that is, the front wall 21a, the rear wall 21b, the right wall 21c, the left wall 21d and the lower wall 21e of the case 21, and the front wall 25a, the rear wall 25b, the right wall 25c of the cover 25, An insulating film 27 is provided on each inner surface of the left wall 25d and the upper wall 25e. Thereby, electrical insulation between the circuit handling these high voltages and the housing 20 is ensured. The insulating film 27 illustrated in FIG. 5A is an example. 5A and 5B are cross-sectional views of the inverter 2 shown in FIG. 4 taken along the YZ plane and viewed in the positive direction of the X axis. A circuit for handling a high voltage accommodated therein, the semiconductor laminated unit 10 and the like are not shown.

  The insulating film 27 is made of rubber or a rubber-based material, and is applied to the inner surfaces of the case 21 and the cover 25. The coating thickness of the insulating film 27 is not uniform, and the coating thickness of the insulating film 27 varies depending on the case 21 or the cover 25 to be coated. For example, it is divided into a thick portion 27a having a coating thickness of 2 mm or more and a thin portion 27b having a thickness of less than 2 mm. The coating thickness is controlled by, for example, the number of coatings, and the thin portion 27b is formed by coating once, and the thick portion 27a is formed by coating twice. When applying by spraying, you may control by injection time or the injection quantity.

  The insulating film 27 may be interposed between the flange 22 of the case 21 and the flange 26 of the cover 25. For example, as shown in FIG. 5B, an extended portion 26a in which a bolt hole is formed in the flange 26 so as to form a seal portion 27c that extends the insulating film 27 provided on the inner surface of the cover 25 to the range of the flange 26. Insulating film 27 is applied to flange 26. As a result, the sealing portion 27 c is interposed between the case 21 and the cover 25, and the insulating film 27 also functions as a sealing member, thereby preventing gas, liquid, dust, and the like from entering the housing 20.

  FIG. 6 is a schematic explanatory diagram showing the application range of the insulating film 27. The rectangular parallelepiped in FIG. 6 represents the internal space of the housing 20 (the case 21 and the cover 25). That is, each surface of the rectangular parallelepiped in FIG. 6 represents the inner surface of the wall of the housing 20 (the case 21 and the cover 25). The hatching in FIG. 6 represents the coating range of the insulating film 27. It should be noted that the hatched portion does not represent the thickness of the insulating film 27. FIG. 6A is a schematic perspective view of the housing 20 as viewed from the upper right front side, and FIG. 6B is a schematic perspective view of the housing 20 from the lower left rear side. FIG. 6C is a schematic plan view of the housing 20 as viewed from above. In addition, illustration of the semiconductor laminated unit 10 etc. which are accommodated in the housing | casing 20, and the flanges 22 and 26 is abbreviate | omitted. The same applies to FIG.

  In the example shown in FIG. 6, in the state where it is arranged in the engine compartment 90 a, a device or device that itself is made of metal, such as the engine 94, the drive train 95, the radiator 96, the compressor 99 for an air conditioner, or a metal case A thick part 27a of the insulating film 27 is formed on the inner surface of the wall of the housing 20 facing the auxiliary machinery having a device, such as a relay box 97 and a sub-battery 98, or a device or device that itself is made of resin, or a resin A thin-walled portion 27b of the insulating film 27 is formed on the inner surface of the wall of the casing 20 that faces the auxiliary machinery having a manufactured casing.

  Since a radiator 96 having a metal casing is located in the forward direction of the inverter 2 (frontward of the vehicle 100), the inner wall of the front wall 21a of the case 21 and the inner surface of the front wall 25a of the cover 25 is thick. An insulating film 27 is applied so as to form the meat part 27a. Since the engine 94 is located on the left side of the inverter 2 (the right seat side of the vehicle 100), the thick portion 27a is provided on the inner surface of the left wall 21d of the case 21 and the left wall 25d of the cover 25. An insulating film 27 is applied so as to form. On the other hand, since the relay box 97 having a resin casing is located on the right side of the inverter 2 (the left seat side of the vehicle 100), the right wall 21c of the case 21 and the right wall of the cover 25 are disposed. An insulating film 27 is applied to the inner surface of 25c so as to form a thin portion 27b. Similarly, an air conditioner compressor 99 having a metal casing is located behind the inverter 2 (rear direction of the vehicle 100), and a drive train 95 is located below the inverter 2. An insulating film 27 is applied to the rear wall 21b, the lower wall 21e, and the rear wall 25b of the cover 25 so as to form a thick portion 27a.

  In addition, since the engine compartment 90a is usually covered with a bonnet (engine hood), it is difficult to assume what can come into contact with the inverter 2 from above the inverter 2 in addition to the hood. Therefore, it is not necessary to apply the insulating film 27 to the upper wall 25e of the cover 25. However, as shown in FIG. 6, the insulating film 27 is applied to the front wall 25a, the rear wall 25b, the right wall 25c, and the left wall 25d. In such a case, the insulating film 27 may be partially applied continuously to the applied wall. For example, as shown in FIG. 6C, an insulating film 27 is applied to the inner surface of the upper wall 25e in the range of the width W from the edge (the hatched range). In this example, the insulating film 27 is formed such that a thick portion 27a is formed in a range following the front wall 25a, the left wall 25d and the rear wall 25b, and a thin portion 27b is formed in a range following the right wall 25c. Is applied. Thereby, since the end of the insulating film 27 is expanded, the insulating film 27 is hardly peeled off.

  Thus, in the arrangement of the engine compartment 90a, the inverter housing 20 (the case 21 and the cover 25) facing the auxiliary devices having a metal housing such as the radiator 96 and the compressor 99 for the air conditioner, the engine 94, and the drive train 95. A thick portion 27a of the insulating film 27 is located on the inner surface of the casing 20, and a casing 20 (case 21 and cover 25) facing an auxiliary machine having a resin casing such as a relay box 97 and a sub-battery 98. A thin portion 27b of the insulating film 27 is located on the inner surface of the insulating film 27. For this reason, even if an impact due to a collision may be applied to the inverter 2, the part of the case 20 that can come into contact with a hard material such as an auxiliary machine having a metal case has an insulating film 27 on its inner surface. Therefore, even if the housing 20 is damaged or deformed, the high-voltage circuit such as the semiconductor laminated unit 10 accommodated in the housing 20 is not fixed. However, dielectric breakdown is unlikely to occur. On the other hand, the influence of the case 20 in a portion that can come into contact with a low-hardness material such as an auxiliary machine having a resin case softer than metal is small even if an impact due to a collision is applied. Therefore, the thin part 27b of the insulating film 27 thinner than the thick part 27a is positioned on the inner surface of the housing 20 (the case 21 and the cover 25) to reduce the amount of insulating material used to form the insulating film 27. Thereby, a structure in which insulation breakdown between the housing 20 and the circuit in the housing 20 hardly occurs is realized at low cost.

  In addition to the accessories having a metal casing, the wall of the casing 20 (case 21 and cover 25) facing the metal body frame such as the side frame 91 and the front frame 92 is also thick on the inner surface. The insulating film 27 may be applied so as to form the meat part 27a.

  Based on the layout relationship between the inverter 94 and the engine 94, the drive train 95, and the auxiliary devices such as the radiator 96 and the relay box 97 in the engine compartment 90a, the housing 20 of the inverter 2 is applied. The technique for setting the thickness of the insulating film 27 to be applied is desirably applied to the devices, devices, and accessories in the engine compartment 90a when the inverter 2 is positioned at substantially the same height. This is because when an impact caused by a collision on the vehicle 100 is applied to the engine compartment 90a, there is a high possibility that a device, equipment, auxiliary equipment, etc. mounted at substantially the same height will come into contact with the inverter 2.

  7 and FIG. 2, when it is difficult to receive an impact from the rear side of the inverter 2 (the rear side of the vehicle 100) due to the structure of the vehicle 100 even in the arrangement in the engine compartment 90 a shown in FIG. 1 and FIG. As shown, the application of the insulating film 27 to the rear walls 21b and 25b of the housing 20 (the case 21 and the cover 25) may be omitted for simplification. Thereby, since the usage-amount of the insulating material which forms the insulating film 27 further reduces, it becomes possible to further reduce cost. FIG. 7 is a schematic explanatory diagram showing the application range of the insulating film 27 in the same expression format as FIG. A two-dot chain line J shown in FIG. 7 (B) and a two-dot chain line K shown in FIG. 7 (C) are provided on the inner surface of the housing 20 where the insulating film 27 is not originally applied, on the front wall 21a and the rear wall 21b. , A boundary line in the case where the insulating film 27 is continuously applied to a part from the right wall 21c or the left wall 21d, the front wall 25a, the rear wall 25b, the right wall 25c or the left wall 25d. The insulating film 27 is applied in a range where cross hatching is applied from K to the outside. In this example, the upper wall 25e in the range following the front wall 25a and the left wall 25d, the rear wall 25b in the range following the left wall 25d, and the rear wall 21b in the range following the left wall 21d are thick parts. A thin wall portion 27b is formed on the upper wall 25e in the range following the right wall 25c, the rear wall 25b in the range following the left wall 25d, and the rear wall 21b in the range following the left wall 21d. Thus, the insulating film 27 is applied. Thereby, since the end of the insulating film 27 is expanded, the insulating film 27 is hardly peeled off.

  Further, when the inverter 2 is disposed behind the suspension tower 93, the front of the inverter 2 can be guarded against impact by the presence of the suspension tower 93. In such an arrangement example of the engine compartment 90a, the application of the insulating film 27 to the front walls 21a and 25a of the housing 20 (the case 21 and the cover 25) may be omitted and simplified. This also makes it possible to further reduce the cost because the amount of the insulating material used to form the insulating film 27 is further reduced.

  Thus, by applying the insulating film 27 of rubber or rubber-based material to the inner surface of the housing 20 (the case 21 and the cover 25), there is an effect of suppressing vibration and sound generated in the housing 20. For this reason, vibration and sound generated from the semiconductor laminated unit 10 and the like are also prevented from leaking to the outside. Further, by applying an insulating film 27 made of rubber or a rubber-based material to the outer surface of the housing 20, an effect of rust prevention and corrosion resistance and a cushion effect can be expected.

  Points to be noted regarding the technology of the embodiment will be described. The case 21 corresponds to an example of a housing body. The front wall 21a, the rear wall 21b, the right wall 21c, the left wall 21d, and the lower wall 21e correspond to an example of “side wall” and “side wall of the housing body”. The cover 25 corresponds to an example of a lid. The front wall 25a, the rear wall 25b, the right wall 25c, the left wall 25d, and the upper wall 25e correspond to an example of the “side wall of the lid”. The side frame 91 and the front frame 92 correspond to an example of a vehicle body frame. The drive train 95, the sub-battery 98, and the air conditioner compressor 99 correspond to an example of “auxiliaries having a metal casing”. The relay box 97 and the sub battery 98 correspond to an example of “auxiliaries having a resin casing”.

  Specific examples of the present invention have been described in detail above, 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 illustrated above. Further, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Moreover, the technique illustrated in this specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2: Inverter 10: Semiconductor laminated unit 20: Housing 21: Case 22, 26: Flange 25: Cover 27: Insulating film 27a: Thick part 27b: Thin part 27c: Seal part 90: Body 90a: Engine compartment 91: Side Frame 92: Front frame 93: Suspension tower 94: Engine 95: Drive train 96: Radiator 97: Relay box 98: Sub battery 99: Air conditioner compressor 100: Vehicle

Claims (3)

It is an arrangement structure in the vehicle of the inverter that supplies AC power to the traveling motor,
The inverter has a metal casing, and the casing has an insulating film on the inner surface of the side wall thereof having a thick portion with a thickness greater than or equal to a predetermined thickness and a thin portion with a thickness less than the predetermined thickness. ,
In the arrangement in the vehicle, the thick part of the insulating film is located on the inner surface of the side wall facing the auxiliary machine having a metal casing, the engine, the driving motor, or the body frame, and is made of resin. An inverter arrangement structure characterized in that a thin portion of an insulating film is located on the inner surface of the side wall facing an auxiliary machine having a housing.   2. The inverter according to claim 1, wherein the inverter is located at substantially the same height with respect to the auxiliary machinery having a metal or resin casing, the engine, the traveling motor, or the vehicle body frame. Inverter arrangement structure.   The casing of the inverter is composed of a casing body and a lid, and the insulating film is composed of rubber or a rubber-based material, and is interposed at the boundary between the casing body and the lid. 2. The inverter arrangement structure according to 2.

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