WO2018051718A1

WO2018051718A1 - Inverter-integrated electric compressor and method for manufacturing same

Info

Publication number: WO2018051718A1
Application number: PCT/JP2017/029581
Authority: WO
Inventors: 一三大里
Original assignee: サンデン・オートモーティブコンポーネント株式会社
Priority date: 2016-09-14
Filing date: 2017-08-10
Publication date: 2018-03-22
Also published as: JP6754252B2; DE112017004627T5; JP2018046649A; CN109690079A

Abstract

Provided is an inverter-integrated electric compressor that achieves a large cost reduction due to a reduction in the number of components and the amount of assembly man-hours and due to a decrease in loss-related expenses. A circuit board 17 of an inverter circuit part 3 has: fastening holes 33 formed through the circuit board; and a connecting hole which has, on an inner surface thereof, a conduction part for conducting to wiring and is formed to penetrate through the circuit board. An electric power switching element 13 has a press-fit terminal 14. Caulking shafts 61 are formed in a protruding manner in a motor housing 4. The caulking shafts are inserted through the fastening holes and the caulking shafts that protrude from the fastening holes are deformed, whereby the circuit board is caulked and fastened to the motor housing. The press-fit terminal is press-fitted into the connection hole, whereby the electric power switching element is electrically connected to the circuit board.

Description

Inverter-integrated electric compressor and manufacturing method thereof

The present invention relates to an inverter-integrated electric compressor having an inverter circuit portion in a housing, and a method for manufacturing the inverter-integrated electric compressor.

Conventionally, as an electric compressor used in a vehicle air conditioner, an inverter-integrated electric compressor in which an inverter circuit portion is attached to a housing is used in consideration of switching noise. In this case, the inverter circuit unit has electric parts such as power switching elements mounted on the circuit board, and is attached to the housing with a plurality of screws. Further, the wiring of the circuit board and the electrical component are connected by soldering (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-40538

However, in such a conventional mounting structure, the inverter circuit portion is fastened to the housing with a large number of screws, so that the cost of parts rises and the number of assembly steps increases, resulting in poor productivity. In addition, the connection between the circuit board and the electrical component has a high rate of soldering failure, which requires a large amount of waste.
The present invention has been made to solve the conventional technical problems, and is an inverter-integrated electric motor that can achieve a significant cost reduction by reducing the number of parts, the number of assembling steps, and the cost of waste. It aims at providing a compressor and its manufacturing method.

The inverter-integrated electric compressor according to the present invention includes a housing in which a motor is built in, and an inverter circuit unit that supplies power to the motor. The inverter circuit unit is connected to the circuit board and the circuit board. The circuit board is provided with a fastening hole formed in the circuit board, and a connection hole formed with a conduction portion to the wiring is formed through the inner surface. The caulking shaft is projected, and the circuit board is caulked and fastened to the housing by inserting the caulking shaft into the fastening hole and deforming the caulking shaft protruding from the fastening hole, and the press fit terminal is connected to the connection hole. The electrical component is electrically connected to the circuit board by press-fitting into the circuit board.
In the inverter-integrated electric compressor according to a second aspect of the present invention, in the above invention, the caulking shaft is integrally formed with a metal constituting the housing, and the caulking shaft is inserted into the fastening hole and protrudes from the fastening hole. By crushing the crimped shaft, the circuit board is crimped to the housing.
The inverter-integrated electric compressor according to a third aspect of the present invention is characterized in that in each of the above-mentioned inventions, the electrical component is a power switching element for switching power feeding to the motor, and is disposed in a heat conduction relationship with the housing. And
According to a fourth aspect of the present invention, there is provided the inverter-integrated electric compressor. In each of the above-described inventions, the circuit board has a resin-molded bus bar assembly, the circuit board has a mounting hole formed therethrough, and the bus bar assembly has a caulking. The shaft is integrally formed so that the caulking shaft of the bus bar assembly is inserted into the mounting hole, and the caulking shaft protruding from the mounting hole is deformed by heat or ultrasonic waves, so that the bus bar assembly is formed on the circuit board. It is characterized by being caulked.
According to a fifth aspect of the present invention, there is provided a method of manufacturing an inverter-integrated electric compressor, wherein the electric fitting press fit terminal of the first to third aspects of the invention is oriented in the same direction as the caulking shaft of the housing. After placing the components in a heat conductive relationship with the housing, the circuit board is placed on the electrical components, and the caulking shaft is inserted into the fastening hole, the caulking is fastened, and the press-fit connection to the press fit terminal is performed in the same process. It is characterized by that.
According to a sixth aspect of the present invention, there is provided a method for manufacturing an inverter-integrated electric compressor, wherein a press-fit terminal of the electric component according to the fourth aspect is oriented in the same direction as a caulking shaft of the housing. Arranged in heat conduction relationship, with the bus bar assembly caulking shaft oriented in the same direction as the housing caulking shaft, the bus bar assembly is placed on the electrical component, and the press-fit terminal protrudes from the bus bar assembly. Insert the housing into the fastening hole of the caulking shaft and the caulking fastening, and insert the caulking shaft into the mounting hole of the bus bar assembly and the caulking fastening, and press-fit connection to the press-fit terminal connection hole. It is performed in a process.

According to the present invention, in an inverter-integrated electric compressor including a housing in which a motor is built and an inverter circuit unit that supplies power to the motor, an inverter circuit including a circuit board and electrical components connected to the circuit board A fastening hole is formed in the circuit board of the part, and a connection hole in which a conduction part to the wiring is formed on the inner surface, a press-fit terminal is provided in the electrical component, and a caulking shaft is projected from the housing. Is inserted into the fastening hole, the caulking shaft protruding from the fastening hole is deformed, the circuit board is caulked and fastened to the housing, and the press-fit terminal is press-fitted into the connection hole, so that the electrical component is electrically connected to the circuit board. Therefore, it is not necessary to fasten the circuit board to the housing with screws, and the number of components can be reduced. In addition, since it is not necessary to solder the electrical component to the circuit board, the soldering failure can be eliminated, and the loss cost can be reduced.
Then, for example, as in the invention of claim 5, in a state where the press-fit terminal of the electrical component is oriented in the same direction as the caulking shaft of the housing, the electrical component is disposed in a heat conductive relationship with the housing, and then the circuit board is mounted on the electrical component. It is possible to perform the insertion of the caulking shaft into the fastening hole and the caulking fastening and the press-fit connection to the connection hole of the press-fit terminal in the same process, so that the assembly man-hour can be significantly reduced. As a result, the overall cost can be significantly reduced.
In particular, as in the invention of claim 3, the electrical component is a power switching element for switching the power supply to the motor, and is effective when connecting the power switching element to the circuit board while being arranged in a heat conduction relationship with the housing. It is.
Here, as in the invention of claim 2, the caulking shaft is formed integrally with the metal constituting the housing, the caulking shaft is inserted into the fastening hole, and the caulking shaft protruding from the fastening hole is crushed, whereby the circuit By caulking the board to the housing, it is possible to effectively reduce the number of parts in an inverter-integrated electric compressor whose housing is usually made of metal, which is extremely effective. Become.
Further, when the circuit board has a resin-molded bus bar assembly as in the invention of claim 4, a mounting hole is further formed through the circuit board, and a caulking shaft projects integrally with the bus bar assembly. Then, the caulking shaft of the bus bar assembly is inserted into the mounting hole, and the caulking shaft protruding from the mounting hole is deformed by heat or ultrasonic waves so that the bus bar assembly is caulked and fastened to the circuit board. For example, screws are not required for mounting the bus bar assembly to the circuit board, and the number of components can be reduced.
In this case, for example, as in the invention of claim 6, with the press-fit terminal of the electric component oriented in the same direction as the caulking shaft of the housing, the electric component is arranged in a heat conductive relationship with the housing, and the bus bar With the caulking shaft of the assembly oriented in the same direction as the caulking shaft of the housing, the bus bar assembly is covered with an electrical component, the press fit terminal is projected from the bus bar assembly, and then the circuit board is covered with the bus bar assembly. Insertion and caulking of the housing caulking shaft into the fastening hole, insertion and caulking of the bus bar assembly into the caulking shaft mounting hole, and press-fit connection to the press-fit terminal connection hole can be performed in the same process. Therefore, it is possible to reduce the assembly man-hours and to greatly reduce the cost.

1 is a perspective view of an inverter-integrated electric compressor according to an embodiment to which the present invention is applied. FIG. 2 is a perspective view of a state where a cover member of the inverter-integrated electric compressor in FIG. 1 is removed. It is the top view seen from the inverter accommodating part side of the state which removed the cover member of the inverter integrated electric compressor of FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a disassembled perspective view of parts other than the smoothing capacitor of the inverter circuit part shown in FIG. It is a figure explaining the crimping fastening structure of the circuit board and front housing of an inverter circuit part shown in FIG. 5, and the crimping fastening structure of a circuit board and a bus-bar assembly. It is a figure explaining the connection structure of the power switching element and circuit board of the inverter circuit part shown in FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The inverter-integrated electric compressor 1 according to the embodiment constitutes a part of a refrigerant circuit of a vehicle air conditioner that air-conditions the interior of a vehicle (not shown), and includes a motor M (shown by a broken line in FIG. 4). And a housing 2 made of metal (aluminum or iron, made of aluminum in the embodiment) having a compression mechanism (not shown) driven by the motor M, and an inverter circuit unit 3 that feeds and drives the motor M. ing.
The housing 2 includes a motor housing 4 that houses the motor M, a compression mechanism housing 6 that is connected to one side in the axial direction of the motor housing 4 and that houses the compression mechanism, and one side of the compression mechanism housing 6. A compression mechanism cover 7 that closes the opening, an inverter accommodating portion 8 that is configured on the other side in the axial direction of the motor housing 4, and a lid member 11 that closes the opening 9 on the other side of the inverter accommodating portion 8 so as to be openable and closable. I have. And the inverter circuit part 3 is accommodated in this inverter accommodating part 8. FIG.
1 and 2 show the inverter-integrated electric compressor 1 of the embodiment with the inverter accommodating portion 8 facing up and the compression mechanism cover 7 facing down. One side is arranged in the lateral direction so that the inverter accommodating portion 8 is on the other side.
The motor M of the embodiment is composed of a three-phase synchronous motor (brushless DC motor), and the compression mechanism is, for example, a scroll type compression mechanism. The compression mechanism is driven by the motor M to compress the refrigerant and discharge it into the refrigerant circuit. A low-temperature gas refrigerant sucked from an evaporator (also referred to as a heat absorber) that also forms part of the refrigerant circuit is circulated in the motor housing 4. Therefore, the inside of the motor housing 4 is cooled. And the inverter accommodating part 8 is divided with the inside of the motor housing 4 in which the motor M is accommodated by the partition 12 formed in the motor housing 4, and this partition 12 is also cooled by a low temperature gas refrigerant.
(1) Configuration of Inverter Circuit Unit 3 The inverter circuit unit 3 includes six power switching elements 13 (FIG. 5) as an example of electrical components constituting the arm of each phase of the three-phase inverter circuit, and printed wiring. A circuit board 17 on which the control circuit 16 is mounted and a filter mold assembly 21 on which a smoothing capacitor 19 is mounted are provided. The circuit board 17 further includes a bus bar assembly 18 (FIGS. 4 and 5). The bus bar assembly 18 is also included in an example of an electrical component.
The inverter circuit unit 3 converts DC power fed from a vehicle battery (not shown) into three-phase AC power and feeds it to a stator coil (not shown) of the motor M. Therefore, the connection point between the power switching element 13 on the upper arm side and the power switching element 13 on the lower arm side of each phase has three terminals on the

lead terminals

22, 23 and 24 drawn from the partition wall 12 of the motor housing 4. The power terminal of the power switching element 13 on the upper arm side and the ground terminal of the power switching element 13 on the lower arm side are respectively connected via the plates 26 and are used for high power called an HV connector attached to the motor housing 4. The connector 28 is connected to the power harness from the battery described above.
In this case, the lead terminals 22 to 24 to which the connection points of the upper arm side power switching element 13 and the lower arm side power switching element 13 of each phase are connected penetrate the partition wall 12 and the motor in the motor housing 4. M is connected to the aforementioned stator coil. The power supply terminal and the ground terminal are connected to the power supply harness through the terminal plate 29 of the filter mold assembly 21 and the high power connector 28 described above.
(2) Configuration of Power Switching Element 13 Each power switching element 13 is composed of an IGBT (or a MOSFET) in the embodiment, and one surface is in close contact with the partition wall 12 of the motor housing 4 via a heat conductive sheet or grease. And is placed in heat conduction relationship with it. Since the partition wall 12 is cooled by the low-temperature gas refrigerant as described above, the power switching element 13 accompanied by heat generation is cooled from the partition wall 12.
Each power switching element 13 includes three press-fit terminals 14 including a gate, a collector, and an emitter. Each press-fit terminal 14 is pulled out from the package 27 of the power switching element 13 and then vertically from the partition wall 12. It is oriented in a standing direction (FIG. 5). Each press-fit terminal 14 has a guide portion 31 with a tapered tip, and a deformable connection portion 32 is formed on the package 27 side of the guide portion 31 so as to be widened (FIG. 7).
(3) Configuration of Circuit Board 17 The control circuit 16 of the control board 17 performs switching control of each power switching element 13 based on an external command. Further, it has a function of transmitting the driving state of the motor M to the outside, and is configured by connecting circuit components such as a microcomputer by printed wiring. Further, a plurality of fastening holes 33 for caulking the motor housing 4 and mounting holes 34 for caulking the bus bar assembly 18 are formed in the periphery of the circuit board 17. In addition, a connection hole 54 to which each press-fit terminal 14 of each power switching element 13 is connected and a connection hole 56 to which each press-fit terminal 52 (to be described later) of the bus bar assembly 18 is connected to the center portion of the circuit board 17. A plurality are formed.
(4) Configuration of Filter Mold Assembly 21 The smoothing capacitor 19 is connected between the power supply terminal and the ground terminal of the three-phase inverter circuit, and absorbs the high-frequency component of the switching current of the three-phase inverter circuit. The smoothing capacitor 19 is disposed on the filter mold assembly (substrate) 21. The terminal plate 29 of the filter mold assembly 21 is electrically connected to the power harness via the high power connector 28 as described above, and the terminal plate 44 is It is connected to the bus bars 49 and 50 of the bus bar assembly 18 described above.
(5) Configuration of Bus Bar Assembly 18 The bus bar assembly 18 that constitutes a part of the circuit board 17 includes five

bus bars

46, 47, 48, 49, and 50 that form wiring of a three-phase inverter circuit, and a plurality of vertically protruding bus bars. The press-fit terminal 52 is provided. The bus bars 46 to 50 are arranged at positions outside the circuit board 17 and are integrated by insert molding of an insulating hard resin. The terminal plates 26 are connected to the bus bars 46 to 48, and the bus bars 49, 50 are connected. To the terminal plate 44 of the filter mold assembly 21. Each press-fit terminal 52 is also formed with a guide 31 having a tapered tip, similarly to the press-fit terminal 14 described above, and a deformable connection 32 is formed on the bus bar assembly 18 side of the guide 31 so as to be widened. (FIG. 7). The bus bars 49 and 50 are also constituted by press-fit terminals having the same structure as the press-fit terminals 52, and the terminal plate 44 is formed with the same structural portions as a connection hole 54 and a conduction portion 58 described later. 49 and 50 are configured to be connected to the structural portion.
A plurality of through holes 51 through which the press-fit terminals 14 of the respective power switching elements 13 pass are formed in the central portion of the bus bar assembly 18. A plurality of caulking shafts 53 are formed on the periphery of the bus bar assembly 18 by integral molding of a hard resin that constitutes the bus bar assembly 18.
(6) Configuration of

Caulking Shafts

53 and 61 and

Connection Holes

54 and 52 Note that the caulking shaft 53 of the bus bar assembly 18 is formed at a position corresponding to each mounting hole 34 of the circuit board 17. Projects vertically. In addition, a plurality of crimping shafts 61 project from the partition wall 12 of the motor housing 4 at positions corresponding to the fastening holes 33 of the circuit board 17 described above. In this case, each crimping shaft 61 is formed by integral molding of aluminum (example) constituting the partition wall 12 in the inverter housing portion 8, and is perpendicular to the partition wall 12 toward the opening 9 of the inverter housing portion 8. Protruding.
Further, a conductive portion 58 that is electrically connected to the wiring of the circuit board 17 is formed on the inner surface of the connection hole 54 of the circuit board 17 (FIG. 7).
(7) Procedure for Assembling Inverter Circuit Unit 3 Next, a procedure for assembling the inverter circuit unit 3 to the motor housing 4 when manufacturing the inverter-integrated electric compressor 1 of the present invention will be described. First, the motor housing 4 in a state where the lid member 11 is not attached is in a state in which the inverter accommodating portion 8 faces upward, and each of the motor housings 4 is placed at a predetermined position on the partition wall 12 through the above-described heat conduction sheet or grease. The power switching element 13 is disposed. As a result, each power switching element 13 is brought into a heat conduction relationship with the partition wall 12. At this time, the press-fit terminal 14 of each power switching element 13 is oriented in the direction of standing vertically from the partition wall 12, that is, in the direction of the opening 9 of the inverter accommodating portion 8 (FIG. 5).
Next, in a state where the crimping shafts 53 of the bus bar assembly 18, the bus bars 46 to 50, and the press-fit terminals 52 are oriented in the direction of the opening 9 of the inverter accommodating portion 8, the bus bar assembly 18 is connected to the power switching elements 13. Put on. At this time, each press-fit terminal 14 of each power switching element 13 is caused to enter each through hole 51 of the bus bar assembly 18 so that the guide portion 31 at the tip thereof protrudes from the bus bar assembly 18.
In this state, the press-fit terminal 14 of each power switching element 13, the caulking shaft 53 and press-fit terminal 52 of the bus bar assembly 18, and the caulking shaft 61 of the partition wall 12 are in the same direction, that is, the opening 9 of the inverter accommodating portion 8. It becomes a shape oriented in the direction.
Next, the circuit board 17 is placed on the bus bar assembly 18. At this time, each caulking shaft 61 protruding from the partition wall 12 is inserted into each fastening hole 33 of the circuit board 17, and its tip is protruded from the fastening hole 33. Further, each caulking shaft 53 formed in the bus bar assembly 18 is inserted into each mounting hole 34 of the circuit board 17, and the tip thereof is protruded from the mounting hole 34.
Further, the guide portions 31 of the press-fit terminals 14 of the power switching elements 13 are caused to enter the connection holes 54 of the circuit board 17. Further, the guide portions 31 of the press-fit terminals 52 of the bus bar assembly 18 are caused to enter the connection holes 56 of the circuit board 17. The bus bars 46 to 50 of the bus bar assembly 18 are located outside the circuit board 17.
Thus, after arrange | positioning the power switching element 13, the bus-bar assembly 18, and the circuit board 17 in the inverter accommodating part 8, the crimping jig | tool 63 shown in FIG. 6 is pressed against the circuit board 17 from the opening 9 side. The caulking jig 63 is provided with a caulking recess 64 that is curved at a position corresponding to the tip of each caulking shaft 61 protruding from each fastening hole 33 of the circuit board 17. A crimped portion 66 having a curved and recessed shape is provided at a position corresponding to the tip of each crimping shaft 53 protruding from the hole 34 (shown collectively in FIG. 6). Thermal caulking or ultrasonic welding equipment is used.
Then, the end of the caulking shaft 61 (aluminum) is crushed by the caulking concave portion 64 of the caulking jig 63 and deformed as shown in FIG. 6, and the circuit board 17 is caulked and fastened to the motor housing 4. The bus bar assembly 18 is crimped to the circuit board 17 by deforming the tip of 53 (hard resin) by heat or ultrasonic waves.
Further, in the pressing process by the caulking jig 63, the connection portions 32 of the press fit terminals 14 of the power switching elements 13 are simultaneously press-fitted into the connection holes 54 of the circuit board 17 to connect the press fit terminals 52 of the bus bar assembly 18. The parts 32 are respectively press-fitted into the connection holes 56 of the circuit board 17. As a result, the connection portion 32 of each press-fit terminal 14 of each power switching element 13 is deformed and press-contacted to the conduction portion 62 of the connection hole 54 of the circuit board 17, so that the press-fit terminal 14 is electrically connected to the wiring of the circuit board 17. Since the connection portion 32 of the press-fit terminal 52 of the bus bar assembly 18 is deformed and press-contacts with the conducting portion 62 of the connection hole 56 of the circuit board 17, the press-fit terminal 52 of the bus bar assembly 18 is connected to the circuit. The wiring is electrically connected to the wiring of the substrate 17.
Thereafter, the lead terminals 22 to 24 and the bus bars 46 to 48 are connected by the terminal plate 26, the filter mold assembly 21 is connected to the bus bars 49 and 50 by the terminal plate 44, and the filter mold assembly 21 is connected to the high power connector by the terminal plate 29. 28. Finally, the lid member 11 is attached to the motor housing 4 with screws 59.
As described above in detail, in the present invention, the circuit board 17 and the circuit board 17 of the inverter circuit unit 3 including the power switching element (electrical component) 13 connected to the circuit board 17 are connected to the fastening hole 33 and the wiring on the inner surface. Are formed through the connection holes 54 and 52 in which the conductive portions 58 are formed, the press

fitting terminals

14 and 52 are provided in the power switching element 13 and the bus bar assembly 18, and the caulking shaft 61 is protruded from the motor housing 4. The caulking shaft 61 is inserted into the fastening hole 33 and the caulking shaft 61 protruding from the fastening hole 33 is deformed, whereby the circuit board 17 is caulked and fastened to the motor housing 4, and the press-

fit terminals

14 and 52 are connected to the connection holes 54. , 56 so that the power switching element 13 and the bus bar assembly 18 are electrically connected to the circuit board 17. , It is not necessary to conclude a circuit board 17 to the motor housing 4 by screws, it is possible to reduce the number of parts. In addition, since it is not necessary to solder the power switching element 13 and the bus bar assembly 18 to the circuit board 17, soldering defects can be eliminated, and the cost of failure can be reduced.
This is particularly effective when the power switching element 13 for switching the power supply to the motor M as in the embodiment is connected to the circuit board 17 while being arranged in a heat conduction relationship with the motor housing 4.
Here, in the embodiment, the caulking shaft 61 is integrally formed of aluminum (metal) constituting the motor housing 4, the caulking shaft 61 is inserted into the fastening hole 33, and the caulking shaft 61 protruding from the fastening hole 33 is used. Since the circuit board 17 is crimped to the motor housing 4 by crushing, the inverter-integrated electric compressor 1 in which the motor housing 4 is usually made of metal such as aluminum or iron is effective. It becomes possible to reduce the number of parts, which is extremely effective.
Further, in the embodiment, the inverter circuit unit 3 includes a resin-molded bus bar assembly 18, and a mounting hole 34 is formed through the circuit board 17, and a caulking shaft 53 is integrally formed on the bus bar assembly 18. Then, the caulking shaft 53 of the bus bar assembly 18 is inserted into the mounting hole 34, and the caulking shaft 53 protruding from the mounting hole 34 is deformed by heat or ultrasonic waves, whereby the bus bar assembly 18 is attached to the circuit board 17. Since the caulking is performed, screws are not required for mounting the bus bar assembly 18 to the circuit board 17, and the number of components can be reduced.
The power switching element 13 and the partition wall 12 of the motor housing 4 are in a heat conduction relationship with the press-

fit terminals

14 and 52 of the power switching element 13 and the bus bar assembly 18 oriented in the same direction as the caulking shaft 61 of the motor housing 4. With the caulking shaft 53 of the bus bar assembly 18 oriented in the same direction as the caulking shaft 61 of the motor housing 4, the bus bar assembly 18 is covered with the power switching element 13, and the press-fit terminal 14 is connected to the bus bar assembly 18. After projecting, the circuit board 17 is put on the bus bar assembly 18 to insert the caulking shaft 61 of the motor housing 4 into the fastening hole 33 and the caulking fastening, and to insert the caulking shaft 53 of the bus bar assembly 18 into the mounting hole 34. And crimping and press-fit terminal 1 Since it is possible to perform press-fit connection to 52 of the connection holes 54, 56 in the same process, it is possible to similarly by reducing the number of assembling steps reduce the substantial cost reduction.
In the embodiment, the hard resin bus bar assembly 18 is provided on the circuit board 17 of the inverter circuit unit 3. However, when the bus bar assembly 18 is not provided (inventions other than claims 4 and 6), power switching is performed. In a state where the press-fit terminal 14 of the element 13 is oriented in the same direction as the caulking shaft 61 of the motor housing 4, the power switching element 13 is disposed in a heat conductive relationship with the motor housing 4, and then the circuit board 17 is replaced with the power switching element. 13, the caulking shaft 61 is inserted into the fastening hole 33 and the caulking is fastened, and the press-fit connection of the press-fit terminal 14 to the connection hole 54 is performed in the same process. Even in that case, the number of assembling steps can be remarkably reduced, and the overall cost can be greatly reduced.
Further, when the motor housing 4 constituting the housing 2 is made of hard resin (invention other than claim 2 and claims dependent thereon), the caulking shaft 61 is also integrally molded with hard resin and heat caulking. Alternatively, the tip is deformed by ultrasonic welding, and the fastening hole 33 is caulked and fastened. The same applies to the case where a hard resin member is fixed in advance in the inverter housing portion 8 of the metal motor housing 4 and the caulking shaft 61 is integrally molded with the hard resin member. In those cases, it is not necessary to secure an insulation distance from the wiring of the circuit board 17 as compared with the case where the metal caulking shaft 61 is used as in the above embodiment. There is an advantage that can be achieved.
Furthermore, in the embodiment, the power switching element 13 is taken as an example of an electrical component. However, other electrical components (for example, a location indicated by reference numeral 67 in FIG. 3) attached to the partition wall 12 side of the circuit board 17 are also connected by press-fit terminals. It is good.
Furthermore, the shape and structure of the inverter circuit section 3 and the housing 2 (motor housing 4) shown in the embodiments are not limited thereto, and various changes can be made without departing from the spirit of the present invention. Needless to say.

DESCRIPTION OF SYMBOLS 1 Inverter integrated electric compressor 2 Housing 3 Inverter circuit part 4 Motor housing 8 Inverter accommodating part 9 Opening 11 Lid member 12 Bulkhead 13

Power switching element

14, 52 Press-fit terminal 16 Control circuit 17 Circuit board 18 Bus bar assembly 32 Connection part 33 Fastening hole 34 Mounting hole 51 Through

hole

53, 61

Caulking shaft

54, 56 Connection hole 58, 62 Conducting portion 64 Caulking recess 66 Caulking portion M Motor

Claims

In an inverter-integrated electric compressor having a housing with a built-in motor and an inverter circuit unit for supplying power to the motor,
The inverter circuit unit includes a circuit board and electrical components connected to the circuit board,
In the circuit board, a fastening hole is formed to penetrate, and a connection hole in which a conduction portion to the wiring is formed on the inner surface is formed to penetrate.
The electrical component has a press-fit terminal,
A caulking shaft is projected from the housing,
By inserting the caulking shaft into the fastening hole and deforming the caulking shaft protruding from the fastening hole, the circuit board is caulked and fastened to the housing,
An electric compressor integrated with an inverter, wherein the electrical component is electrically connected to the circuit board by press-fitting the press-fit terminal into the connection hole.
The caulking shaft is integrally formed with a metal constituting the housing,
2. The inverter according to claim 1, wherein the circuit board is crimped to the housing by inserting the crimping shaft into the fastening hole and crushing the crimping shaft protruding from the fastening hole. Integrated electric compressor.
The inverter integrated type according to claim 1, wherein the electrical component is a power switching element for switching power feeding to the motor, and is disposed in a heat conduction relationship with the housing. Electric compressor.
The circuit board has a resin molded bus bar assembly,
A mounting hole is formed through the circuit board,
A caulking shaft is integrally formed on the bus bar assembly.
The bus bar assembly is caulked and fastened to the circuit board by inserting the caulking shaft of the bus bar assembly into the mounting hole and deforming the caulking shaft protruding from the mounting hole by heat or ultrasonic waves. The inverter-integrated electric compressor according to any one of claims 1 to 3.
In a state where the press-fit terminal of the electrical component is oriented in the same direction as the caulking shaft of the housing, the electrical component is disposed in a heat conductive relationship with the housing,
Put the circuit board on the electrical component,
The insertion of the caulking shaft into the fastening hole and the caulking fastening and press-fit connection of the press-fit terminal to the connection hole are performed in the same process. A method for manufacturing an inverter-integrated electric compressor according to claim 1.
With the press-fit terminal of the electrical component oriented in the same direction as the caulking shaft of the housing, the electrical component is placed in a heat conductive relationship with the housing,
With the crimping shaft of the bus bar assembly oriented in the same direction as the crimping shaft of the housing, the bus bar assembly is placed on the electrical component, and the press-fit terminal protrudes from the bus bar assembly.
Covering the circuit board on the bus bar assembly, inserting the caulking shaft of the housing into the fastening hole and caulking, inserting the caulking shaft of the bus bar assembly into the mounting hole and caulking and fastening, The method for manufacturing an inverter-integrated electric compressor according to claim 4, wherein the press-fitting connection to the connection hole is performed in the same process.