JP5418382B2 - Electrical equipment - Google Patents

Description

  The present invention relates to an electrical device.

An inverter and another structure are connected using a bus bar (Patent Document 1, etc.).
An example thereof will be described with reference to FIG. As shown in FIG. 7A, a vehicle power control unit (PCU) has a case 100, and an inverter is accommodated in the case 100. The inverter converts DC power from the battery into AC power for driving the motor. An internal bus bar 101 of the power control unit is disposed in the case 100. A motor connector 110 and a battery connector 120 are provided outside the case 100. The input / output bus bar 130 in the motor connector 110 is connected to the motor, and the input / output bus bar 130 in the battery connector 120 is connected to the battery. As shown in FIG. 7C, the input / output bus bar 130 is integrally provided with a nut 140. Then, the input / output bus bar 130 is inserted into the case 100 through the opening 100a provided in the case 100, and the internal bus bar 101 and the input / output bus bar 130 are stacked in the case 100 as shown in FIG. The bolt 150 is screwed into the nut 140 and fastened.

JP 2008-289243 A

  Since the nut 140 is provided on the input / output bus bar 130 side, the width W of the opening 100a of the case 100 is increased. Moreover, if it changes to a cap nut for a chip countermeasure, the width W of case opening part 100a will become large further. Furthermore, if a wall or a cover is provided between the other parts in the case 100 as a measure against chips, the power control unit itself is increased in size and costs are increased.

  The present invention has been made under such a background, and an object thereof is to insert a second conductive member fastened to a first conductive member of a power conversion device in a case that houses the power conversion device. It is an object of the present invention to provide an electric device capable of reducing the size of the opening and taking measures against chips.

In the invention according to claim 1, the case is connected to at least one of a power conversion device having a first conductive member housed in the case and extending in the case, and a load and a power source arranged outside the case, and the case A second conductive member extending into the case through the opening, a bolt penetrating the first conductive member and the second conductive member in the case, and the bolt screwed into the case. A nut for fastening the first conductive member and the second conductive member to electrically connect the first conductive member and the second conductive member; and a nut disposed in the case; a current sensor detecting a current flowing in the conductive members are secured to said current sensor within said casing, and a nut accommodating member for accommodating the nut, the nut accommodating portion , Said nut recess is formed to be fitted, the depth of the recess and subject matter that is larger than the thickness of the nut.

  According to the first aspect of the present invention, the first conductive member of the power conversion device extends in the case. A second conductive member connected to at least one of a load and a power source arranged outside the case extends into the case through the opening of the case.

Here, a current sensor for detecting a current flowing through the first conductive member is disposed in the case, a nut housing member is fixed to the current sensor, and a nut is fitted into a recess of the nut housing member.

  On the other hand, the bolt passes through the first conductive member and the second conductive member in the case, the bolt is screwed into the nut, and the first conductive member and the second conductive member are fastened together to form the first conductive member. The member and the second conductive member are electrically connected.

As a result, the opening for inserting the second conductive member to be fastened to the first conductive member of the power conversion device in the case in which the power conversion device is accommodated is reduced without providing a nut in the second conductive member. be able to. Further, since the nut is fitted in the recess of the nut housing member , it is possible to take measures against chips by preventing the chips generated when the bolts are screwed into the nut from coming out of the nut housing member.

The gist of the second aspect of the present invention is that the current sensor and the nut housing member are integrated in the electric device according to the first aspect.
According to the second aspect of the present invention, since the current sensor and the nut housing member are integrated, component management is facilitated.

  As described in claim 3, in the electric device according to claim 1 or 2, the first conductive member and the second conductive member may be bus bars.

  ADVANTAGE OF THE INVENTION According to this invention, the opening part for insertion of the 2nd electrically-conductive member fastened with the 1st electrically-conductive member of the power converter device in the case which accommodates a power converter device can be made small, and a chip countermeasure is taken. be able to.

(A) is a partial front view of the power control unit in this embodiment, (b) is a longitudinal cross-sectional view along the AA line of (a). The partial bottom view of a power control unit. The exploded perspective view of a power control unit. The circuit diagram which shows the electric constitution of a power control unit. (A) is a front view in the front-end | tip part of the internal bus bar of a power control unit, (b) is sectional drawing in the AA of (a). The disassembled perspective view which shows a part of inside of a power control unit. (A) is a disassembled perspective view of the power control unit for demonstrating background art, (b) is a partial cross section figure of a power control unit, (c) is a side view which shows the front-end | tip part of an input-output bus bar.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1A shows a partial front view of a power control unit (PCU) 10 for a vehicle as an electric device in the present embodiment. FIG. 1B shows a longitudinal section taken along line AA in FIG. FIG. 2 shows a partial bottom view of the power control unit 10. FIG. 3 is an exploded perspective view of the power control unit 10. FIG. 4 shows an electrical configuration of the power control unit 10.

  The power control unit 10 includes an inverter 20 (see FIG. 4) as a power conversion device, three output bus bars 30, three bolts 40, three nuts 50, and three current sensors 60 shown in FIG. Three nut storage boxes 70 are provided.

As shown in FIG. 4, a battery 80 and a three-phase motor 90 as a load are connected to the inverter 20, and the inverter 20 drives the motor 90 with a three-phase alternating current.
In addition, current sensors 60 are respectively provided in the U, V, and W phase output lines to the motor 90 in the inverter 20, and the control circuit 21 controls the output based on the current value detected by the current sensor 60.

An inverter 20 as a power converter is housed in the case 11 of FIG. The case 11 has a box shape.
The inverter 20 has three internal bus bars 25 as first conductive members. The internal bus bar 25 extends downward in the case 11. The internal bus bar 25 is a strip having a rectangular cross section and extends linearly.

  A motor 90 as a load is disposed outside the case 11, and three output bus bars 30 as second conductive members are connected to the motor 90 via cables, connectors, and the like. The inverter 20 is connected. The output bus bar 30 is a strip having a rectangular cross section and extends linearly.

  As shown in FIG. 2, an opening 11 a for inserting the output bus bar 30 is formed in the bottom plate portion of the box-shaped case 11. The opening 11 a of the case 11 has a rectangular shape, and the length of the short side, that is, the width W 1 of the opening 11 a is slightly larger than the thickness of the output bus bar 30. The output bus bar 30 is inserted into the case 11 from below through the opening 11a, and the distal end side of the output bus bar 30 extends into the case 11.

  As shown in FIGS. 5 and 6, a through hole 25 a for inserting a bolt is formed at the tip of the internal bus bar 25. Similarly, as shown in FIG. 6, a through hole 30 a for inserting a bolt is formed at the tip of the output bus bar 30.

  In the case 11, the bolt 40 passes through the through hole 30 a of the output bus bar 30 and the through hole 25 a of the internal bus bar 25 (through the internal bus bar 25 and the output bus bar 30). The bolt 40 is screwed into a nut 50 described later through an opening (screw fixing hole) 11b of the case 11 shown in FIG. Accordingly, in the case 11, the bolt 40 is screwed into the nut 50 to fasten the internal bus bar 25 and the output bus bar 30, and thereby the internal bus bar 25 and the output bus bar 30 are electrically connected.

  Three current sensors 60 are arranged in the case 11. Each current sensor 60 is arranged in a state of penetrating the tip of each internal bus bar 25. Each current sensor 60 is supported by a member disposed in the case 11. The current flowing through the internal bus bar 25 is detected by the current sensor 60.

  In the case 11, as shown in FIG. 5, a nut housing box 70 as a nut housing member is fixed to each current sensor 60. The nut housing box 70 is made of resin and has a rectangular parallelepiped shape. A recess 71 is formed in the nut housing box 70, and the recess 71 has a hexagonal shape. A hexagonal nut 50 is fitted in the recess 71, and the nut 50 is accommodated in the nut accommodation box 70. The depth of the recess 71 is larger than the thickness of the nut 50. The internal bus bar 25 is disposed at the opening of the recess 71 in the nut housing box 70 so as to close the opening of the recess 71. At this time, the through hole 25 a of the internal bus bar 25 is located at the opening of the recess 71.

  Thus, the nut 50 is embedded in the nut housing box 70 fixed to the current sensor 60 in a state where the bolt 40 can be screwed. In the present embodiment, the current sensor 60 and the nut housing box 70 are integrated.

The assembly of the power control unit 10 is as follows.
The internal bus bar 25 of the inverter 20 extends in the case 11 so that the tip side faces downward. Further, a current sensor 60 that detects a current flowing through the internal bus bar 25 in the case 11 is disposed. A nut housing box 70 is fixed to the current sensor 60, and the nut 50 is housed in the nut housing box 70.

  The output bus bar 30 is connected to the motor 90 disposed outside the case 11 via a cable, a connector, or the like, and the output bus bar 30 is inserted into the case 11 through the opening 11 a of the case 11. Further, as shown in FIG. 6, the bolt 40 passes through the through hole 30 a of the output bus bar 30 and the through hole 25 a of the internal bus bar 25 (through the output bus bar 30 and the internal bus bar 25) in the case 11 and is screwed into the nut 50. Entered. Thereby, the internal bus bar 25 and the output bus bar 30 are fastened. As a result, the internal bus bar 25 and the output bus bar 30 are electrically connected.

  Thus, it is not necessary to provide the output bus bar 30 with a nut. As a result, the width W1 (see FIG. 2) of the opening 11a for insertion of the output bus bar 30 fastened to the internal bus bar 25 of the inverter 20 in the case 11 housing the inverter 20 can be reduced.

  Further, chips are generated when the bolt 40 is screwed into the nut 50, but the recess 71 is formed deeper than the nut 50, and the chips accumulate in the recess 71 of the nut housing box 70. Therefore, there is no swarf outside. That is, since the nut 50 is accommodated in the nut accommodation box 70, the chips generated when the bolts 40 are screwed into the nut 50 are prevented from coming out of the nut accommodation box 70 and measures against the chips are taken. Can do.

As described above, according to the present embodiment, the following effects can be obtained.
(1) A nut housing box 70 made of resin was made, a nut 50 was inserted into the nut housing box 70, and the nut housing box 70 was attached to the current sensor 60. Thereby, the width W1 of the opening 11a in the case 11 can be reduced. Moreover, it is not necessary to provide a wall or a cover between other parts inside the case as a measure against chips. Thereby, while being able to aim at the cost reduction for chip countermeasures, the size of the power control unit 10 only for the chip countermeasures can be reduced.

(2) Since the current sensor 60 and the nut housing box 70 are integrated, component management is easy.
The embodiment is not limited to the above, and may be embodied as follows, for example.

  -Although the current sensor 60 and the nut storage box 70 are integrated, a separate body may be sufficient. At this time, the nut housing box 70 may be attached to the current sensor 60 by bolting or may be fixed by fitting.

The nut 50 may be inserted into the nut housing box 70 and integrally molded. At this time, the nut may be a cap nut.
The lid of the current sensor 60 and the nut housing box 70 may be used together. In this case, the cost can be further reduced.

  -Although the case where the motor 90 which is load was connected to the inverter 20 was demonstrated, you may apply when connecting the battery 80 as a power supply. In addition, the present invention may be applied when connecting a motor 90 as a load and a battery 80 as a power source. In short, the second conductive member (input / output bus bar) may be connected to at least one of a load and a power source disposed outside the case 11 and extend into the case 11 through the opening 11a of the case 11.

  In the above embodiment, the output bus bar 30 is inserted from the lower surface of the case 11. However, the present invention is not limited to this. For example, the output bus bar 30 may be inserted from the side surface other than the lower surface of the case 11.

-Although it applied when the inverter was used as a power converter, it is not restricted to this. For example, a converter may be used as the power conversion device.
-Although it applied to the power control unit of a vehicle as an electric equipment, you may apply to electric equipments other than the power control unit of a vehicle.

  DESCRIPTION OF SYMBOLS 10 ... Power control unit, 11 ... Case, 11a ... Opening, 20 ... Inverter, 25 ... Internal bus bar, 30 ... Output bus bar, 40 ... Bolt, 50 ... Nut, 60 ... Current sensor, 70 ... Nut storage box, 90 ... motor.

Claims (3)

A power conversion device housed in a case and having a first conductive member extending in the case;
A second conductive member connected to at least one of a load and a power source arranged outside the case and extending into the case through an opening of the case;
A bolt passing through the first conductive member and the second conductive member in the case;
A nut that is screwed into the case to fasten the first conductive member and the second conductive member to electrically connect the first conductive member and the second conductive member. When,
A current sensor disposed in the case and detecting a current flowing through the first conductive member;
A nut housing member fixed to the current sensor in the case and housing the nut ;
The nut housing member is formed with a recess into which the nut is fitted, and the depth of the recess is larger than the thickness of the nut .   The electric device according to claim 1, wherein the current sensor and the nut housing member are integrated.   The electrical apparatus according to claim 1, wherein the first conductive member and the second conductive member are bus bars.

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