JP2022114914A - Drive unit and assembly method of drive unit - Google Patents

Abstract

To provide a drive unit capable of suppressing a complicated configuration and increase of cost required for configuration, and an assembly method of the drive unit.SOLUTION: A drive unit 10 has a first rotary electric machine 2, a second rotary electric machine 3, a power control unit 4, a first case 31, a second case 32, three-phase connectors 28 and 29, and a screw member 62. The first rotary electric machine 2 and the second rotary electric machine 3 are accommodated in the first case 31. The power control unit 4 is accommodated in the second case 32. The three-phase connectors 28 and 29 electrically connect and mechanically fix a first electric machine side bus bar 44 and a second electric machine side bus bar 45 to a first control side bus bar 41 and a second control side bus bar 42. The screw member 62 has a shank mounted on a screw installation part 61 formed in the first case 31 and a head part facing an open hole 71 formed in the second case 32. The screw member 62 has a flange part larger than the open hole 71.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drive unit and a method for assembling the drive unit.

2. Description of the Related Art Conventionally, for example, there is known a drive unit that integrates a drive device including a plurality of rotating electrical machines and a control unit that controls the plurality of rotating electrical machines of the drive device (see, for example, Patent Document 1). The drive unit includes a first bolt for electrically coupling the drive and the control unit, and a plurality of second bolts for mechanically fixing the drive and the control unit.

Japanese Patent Application Laid-Open No. 2016-140200

By the way, if different bolts are required for electrical connection and mechanical fixation, as in the drive unit of the prior art described above, there arises a problem that the configuration becomes complicated and the cost required for the configuration increases. Also, the first bolt for electrical connection in the conventional drive unit described above is a special bolt such as a stepped bolt in which the nut mounting portion and the threaded portion are wound in opposite directions. Furthermore, the problem arises that the structure becomes complicated and the cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive unit and a method for assembling the drive unit, which can suppress the complexity of the configuration and increase the cost required for the configuration.

In order to solve the above problems and achieve the object, the present invention employs the following aspects.
(1) A drive unit according to one aspect of the present invention (for example, the drive unit 10 in the embodiment) includes at least one rotating electrical machine (for example, the first rotating electrical machine 2 and the second rotating electrical machine 3 in the embodiment) and , a power control unit (for example, the power control unit 4 in the embodiment) that controls power transfer to and from the at least one rotating electrical machine; and a first housing that houses each of the at least one rotating electrical machine and the power control unit. body (for example, the first case 31 in the embodiment) and a second housing (for example, the second case 32 in the embodiment), and the input/output unit of the at least one rotating electric machine (for example, each Terminals U1, V1, W1, each terminal U2, V2, W2) connected to a first conductive member (for example, the first electric machine side bus bar 44, the second electric machine side bus bar 45 in the embodiment) and the power control unit Second conductive members (for example, the first control-side bus bar 41 in the embodiment, 2nd control side bus bar 42), an insertion type connection member (for example, each three-phase connector 28, 29 in the embodiment) for electrically connecting and mechanically fixing, and formed in the first housing A shaft portion (for example, the shaft portion 62a in the embodiment) attached to the screw mounting portion (for example, the screw mounting portion 61 in the embodiment) and a through hole formed in the second housing (for example, the a screw member (for example, the screw member 62 in the embodiment) having a head (for example, the head 62b, the head 62f in the embodiment) facing the through hole 71 in the form, and the screw member A flange portion larger than the through hole (for example, the flange portion 62c in the embodiment), the head larger than the through hole (for example, the head portion 62f in the embodiment), or attached to the head and the A mounting member (for example, the mounting member 81 in the embodiment) that is larger than the through hole is provided.

(2) In the drive unit described in (1) above, the connection members include terminal members (for example, control-side bus bars 41 and 42 in the embodiment) and receiving members into which the terminal members are inserted (for example, and a connecting member 46) in the form of a threaded mounting portion capable of mounting the entire shaft portion, and the length of the shaft portion (for example, the length LA in the embodiment) is equal to the receiving member The maximum distance (for example, , may be greater than the maximum distance D) in the embodiment.

(3) In the drive unit described in (1) or (2) above, in the integrally connected state of the first housing and the second housing, the head larger than the flange portion and the through hole The portion or the mounting member and the opening end of the through hole on the side of the first housing (for example, the opening end 71a in the embodiment) may be separated from each other by a predetermined distance in the axial direction of the shaft portion.

(4) A method for assembling a drive unit according to an aspect of the present invention is a method for assembling the drive unit (for example, drive unit 10 in the embodiment) according to any one of (1) to (3) above. A step of attaching the screw member to the screw attachment portion formed in the first housing in the separated state of the first housing and the second housing (for example, the first housing in the embodiment) step), and electrically connecting the first conductive member and the second conductive member by the connecting member while facing the head portion of the screw member to the through hole formed in the second housing. and connecting and mechanically fixing (eg, the second step in the embodiment).

According to the above (1), by providing a screw member that is attached to the first housing and has a portion or member that is larger than the through hole of the second housing, the first housing and the second housing are connected. In this state, the screw member rotated in the direction of removing from the first housing displaces the second housing in the direction away from the first housing. As a result, the connection state between the first housing and the second housing is released, and the first conductive member and the second conductive member are electrically connected and mechanically fixed while suppressing the complication of the configuration. can be easily released.

In the case of (2) above, by providing a screw member having a shaft length greater than the maximum distance between the tip of the terminal member and the contact, the shaft portion of the screw member attached to the screw mounting portion is screwed. The contact between the terminal member and the receiving member is properly released until the terminal member is removed from the mounting portion. This makes it possible to easily release the electrical connection and the mechanical fixation between the first conductive member and the second conductive member with a simple configuration.

In the case of (3) above, the screw member having a portion or member larger than the through hole of the second housing is separated from the second housing while the first housing and the second housing are integrally connected. By being arranged, it is possible to prevent restriction of electrical connection and mechanical fixation between the first conductive member and the second conductive member.

According to (4) above, after the screw member having a portion or member larger than the through hole of the second housing is attached to the first housing, the head of the screw member faces the through hole of the second housing. The first conductive member and the second conductive member are electrically connected and mechanically fixed while being pressed together. As a result, the screw member that is rotated in the direction of detaching from the first housing in the connected state of the first housing and the second housing displaces the second housing in the direction away from the first housing. To easily release the coupling state between the first housing and the second housing and release the electrical connection and mechanical fixation between the first conductive member and the second conductive member while suppressing complication It can be carried out.

FIG. 2 is an exploded perspective view showing the configuration of the drive unit according to the embodiment of the present invention; 1 is a configuration diagram of a vehicle equipped with a drive unit according to an embodiment of the invention; FIG. FIG. 4 is a cross-sectional view of part of the drive unit according to the embodiment of the present invention, showing a state (first state) before integration of the first case and the second case; FIG. 5 is a cross-sectional view of part of the drive unit in the embodiment of the present invention, showing a state (second state) after integration of the first case and the second case; The figure which expands and shows the connection member shown in FIG. FIG. 4 is a partial cross-sectional view of the drive unit according to the embodiment of the present invention, showing a separated state (third state) after integration of the first case and the second case; FIG. 10 is a cross-sectional view of part of the drive unit in the first modified example of the embodiment of the invention, showing a state after the first case and the second case are integrated; FIG. 10 is a cross-sectional view of part of a drive unit in a second modified example of the embodiment of the invention, showing a state after integration of the first case and the second case;

A drive unit 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view showing the configuration of a drive unit 10 according to the embodiment. FIG. 2 is a diagram showing a configuration of part of the vehicle 1 on which the drive unit 10 is mounted according to the embodiment.
In the following description, directions of the X-axis, Y-axis, and Z-axis, which are orthogonal to each other in the three-dimensional space, are directions parallel to the respective axes. For example, as shown in FIG. 1, the Z-axis direction is parallel to the vertical direction of the vehicle 1, the Y-axis direction is parallel to the axial direction of the rotating shafts of the rotary electric machines 2 and 3 of the drive unit 10, and the X The axial direction is orthogonal to the Z-axis direction and the Y-axis direction.

<Vehicle>
A drive unit 10 according to the present embodiment is mounted in a vehicle 1 such as an electric vehicle, for example. Electric vehicles include electric vehicles, hybrid vehicles, fuel cell vehicles, and the like. An electric vehicle is driven by a battery as a power source. A hybrid vehicle is driven by a battery and an internal combustion engine as power sources. A fuel cell vehicle is driven by a fuel cell as a power source.
As shown in FIG. 2, the vehicle 1 includes, for example, a first rotating electric machine 2 and a second rotating electric machine 3, a power control unit 4, a battery 5, an electronic control unit 6, and a gate drive unit 7. The first rotating electrical machine 2 and the second rotating electrical machine 3 form a rotating electrical machine unit 8 .

The first rotating electric machine 2 is for driving the vehicle 1, for example, and generates rotational driving force by performing a power running operation with electric power supplied from the battery 5 via the power control unit 4. As shown in FIG. Note that the first rotating electric machine 2 may generate electric power by performing regenerative operation with rotational power input to the rotating shaft from the wheel side.
The second rotating electric machine 3 is for power generation of the vehicle 1, for example, and generates electric power from rotational power input to the rotating shaft. For example, when the second rotating electric machine 3 can be connected to an internal combustion engine, it generates power using the power of the internal combustion engine. For example, when the second rotating electric machine 3 can be connected to the wheels, it generates electric power through regenerative operation using rotational power input from the wheels to the rotating shaft. It should be noted that the second rotating electric machine 3 may generate rotational driving force by performing a power running operation with electric power supplied from the battery 5 via the power control unit 4 if it can be connected to the wheels.
For example, each of the first rotating electrical machine 2 and the second rotating electrical machine 3 is a three-phase AC brushless DC motor. The three phases are U phase, V phase and W phase. Each rotating electric machine 2, 3 includes a rotor having permanent magnets for magnetic fields, and a stator having three-phase stator windings for generating a rotating magnetic field for rotating the rotor. The 3-phase stator windings are connected to the power control unit 4 .

The power control unit 4 includes, for example, a first power converter 21 and a second power converter 22, a third power converter 23, a first smoothing capacitor 24 and a second smoothing capacitor 25, a resistor 26, noise and a filter 27 .

The first power conversion unit 21 and the second power conversion unit 22 include the same circuit such as an inverter that converts power between direct current and alternating current. Each of the first power converter 21 and the second power converter 22 includes a positive terminal, a negative terminal, and three-phase U-phase, V-phase, and W-phase terminals.
The positive terminal Pa of the first power conversion section 21 and the positive terminal Pb of the second power conversion section 22 are connected to the second positive terminal P2 of the third power conversion section 23 . The negative terminal Na of the first power converter 21 and the negative terminal Nb of the second power converter 22 are connected to the second negative terminal N2 of the third power converter 23 .
The three-phase terminals Ua, Va, and Wa of the first power converter 21 are connected to the three-phase stator winding terminals U1, V1, and W1 of the first rotating electric machine 2 via a three-phase connector 28. It is Three-phase terminals Ub, Vb, and Wb of the second power converter 22 are connected to terminals U2, V2, and W2 of the three-phase stator windings of the second rotating electric machine 3 via a three-phase connector 29. It is

Each of the first power converter 21 and the second power converter 22 includes, for example, a bridge circuit formed by a plurality of switching elements and rectifying elements that are bridge-connected in three phases. The switching element is a transistor such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semi-conductor Field Effect Transistor). A rectifying element is a diode connected in parallel with each transistor.
The bridge circuit includes a pair of high side arm and low side arm U-phase transistors UH and UL, a pair of high side arm and low side arm V-phase transistors VH and VL, and a pair of high side arm and low side arm W-phase transistors. WH and WL. The bridge circuit includes a free wheel diode connected forward from the emitter to the collector between the collector and emitter of each transistor UH, UL, VH, VL, WH, WL.

A collector of each transistor UH, VH, WH of the high side arm is connected to a positive terminal (positive terminal Pa or positive terminal Pb). The emitter of each transistor UL, VL, WL of the low side arm is connected to a negative terminal (negative terminal Na or negative terminal Nb). In each of the three phases, the emitters of the transistors UH, VH, WH on the high side arm and the collectors of the transistors UL, VL, WL on the low side arm are connected to the three phase terminals (phase terminals Ua, Va, Wa or each phase terminal Ub, Vb, Wb).

Each of the first power conversion section 21 and the second power conversion section 22 controls the operation of each of the first rotating electrical machine 2 and the second rotating electrical machine 3 . Each of the power conversion units 21 and 22 turns on (conducts)/off (conducts) the transistor pair of each phase based on a gate signal that is a switching command input to the gate of each transistor UH, VH, WH, UL, VL, and WL. cut off).
Each of the power converters 21 and 22 converts DC power input from each of the positive terminals Pa and Pb and each of the negative terminals Na and Nb into three-phase AC power when the rotating electric machines 2 and 3 are powered, for example. It is supplied to electric machines 2 and 3. Each of the power converters 21 and 22 generates rotational driving force by sequentially commutating the energization of the three-phase stator windings of each of the rotary electric machines 2 and 3 .
Each of the power conversion units 21 and 22, for example, during regeneration of each of the rotating electrical machines 2 and 3, turns on (conducts) and turns off (shuts off) the transistor pairs of each phase synchronized with the rotation of each of the rotating electrical machines 2 and 3. , the three-phase AC power input from each of the three-phase terminals Ua, Va, Wa, Ub, Vb, and Wb is converted into DC power. Each of the power converters 21 and 23 can supply DC power converted from three-phase AC power to the battery 5 via the third power converter 23 .

The third power conversion unit 23 includes, for example, a DC-DC converter or the like that performs bidirectional power conversion of stepping up and stepping down. The third power converter 23 includes a first positive terminal P1, a first negative terminal N1, and a second positive terminal P2 and a second negative terminal N2.
A first positive terminal P<b>1 and a first negative terminal N<b>1 of the third power converter 23 are connected to a positive terminal BP and a negative terminal BN of the battery 5 . A second positive terminal P2 and a second negative terminal N2 of the third power converter 23 are connected to positive terminals Pa, Pb and negative terminals Na, Nb of the power converters 21 and 22, respectively.

The third power conversion unit 23 includes, for example, a pair of switching elements and rectifying elements of a low side arm and a high side arm, and a reactor. The switching elements are transistors such as IGBTs or MOSFETs. The paired switching elements of the low side arm and the high side arm are the first transistor S1 of the low side arm and the second transistor S2 of the high side arm. The rectifying element is a freewheeling diode connected in parallel in the forward direction from the emitter to the collector between the collector and emitter of each of the first transistor S1 and the second transistor S2. A reactor is a choke coil L.

The emitter of the first transistor S1 of the low side arm is connected to the first negative terminal N1 and the second negative terminal N2. The collector of the second transistor S2 of the high side arm is connected to the second positive terminal P2. The collector of the first transistor S1 and the emitter of the second transistor S2 are connected to first ends of the choke coil L at both ends. Second ends of the choke coil L are connected to the first positive terminal P1.

The third power conversion unit 23 switches ON (conducting)/OFF (cutting off) of each of the transistors S1 and S2 based on a gate signal which is a switching command input to the gate of each of the transistors S1 and S2.
The third power conversion unit 23 boosts the power input from the battery 5 to the first positive terminal P1 and the first negative terminal N1 during boosting, and converts the boosted power to the second positive terminal P2 and the second negative terminal P2. Output from the terminal N2. The third power converter 23 accumulates magnetic energy by DC excitation of the reactor (choke coil L) when the second transistor S2 of the high side arm is turned off (cut off) and the first transistor S1 of the low side arm is turned on (conducted). . The third power conversion unit 23 generates an induced voltage generated by the magnetic energy of the reactor (choke coil L) when the second transistor S2 of the high side arm is turned on (conduction) and the first transistor S1 of the low side arm is turned off (cut off). A voltage higher than that of the first positive terminal P1 and the first negative terminal N1 is generated at the second positive terminal P2 and the second negative terminal N2 by superposing the voltage applied to the first positive terminal P1 and the first negative terminal N1. Let

When stepping down the voltage, the third power conversion unit 23 steps down the power input from the second positive terminal P2 and the second negative terminal N2, and outputs the stepped-down power from the first positive terminal P1 and the first negative terminal N1. Output to the battery 5. The third power converter 23 accumulates magnetic energy by DC excitation of the reactor (choke coil L) when the second transistor S2 of the high side arm is turned on (conduction) and the first transistor S1 of the low side arm is turned off (cut off). . The third power conversion unit 23 converts the induced voltage generated by the magnetic energy of the reactor (choke coil L) when the second transistor S2 of the high side arm is turned off (interrupted) and the first transistor S1 of the low side arm is turned on (conducted). By stepping down, a voltage lower than that of the second positive terminal P2 and the second negative terminal N2 is generated at the first positive terminal P1 and the first negative terminal N1.

The first smoothing capacitor (first smoothing capacitor) 24 is connected between the first positive terminal P<b>1 and the first negative terminal N<b>1 of the third power converter 23 . The first smoothing capacitor 24 is connected in parallel with the battery 5 . The first smoothing capacitor 24 smoothes voltage fluctuations that occur with the ON/OFF switching operation of the first transistor S1 and the second transistor S2 when the third power converter 23 steps down the voltage.
The second smoothing capacitor (second smoothing capacitor) 25 is connected between the second positive terminal P2 and the second negative terminal N2 of the third power converter 23 . The second smoothing capacitor 25 suppresses voltage fluctuations caused by the on/off switching operations of the transistors UH, UL, VH, VL, WH, and WL of the first power conversion unit 21 and the second power conversion unit 22, respectively. to smooth the The second smoothing capacitor 25 smoothes voltage fluctuations that occur as a result of ON/OFF switching operations of the first transistor S1 and the second transistor S2 during boosting of the third power converter 23 .

The resistor 26 is connected between the positive terminal Pa and the negative terminal Na of the first power conversion section 21, between the positive terminal Pb and the negative terminal Nb of the second power conversion section 22, and between the second positive terminal P2 and the negative terminal P2 of the third power conversion section 23. It is connected between the second negative terminals N2.

The noise filter 27 is provided between the positive terminal Pa and the negative terminal Na of the first power conversion section 21, between the positive terminal Pb and the negative terminal Nb of the second power conversion section 22, and between the second positive terminal P2 and the negative terminal P2 of the third power conversion section 23. It is connected between the second negative terminals N2. The noise filter 27 has two capacitors (capacitors) 27a connected in series. A connection point between the two capacitors 27a is connected to the body ground of the vehicle 1 or the like.

The battery 5 is, for example, a high voltage battery that is the power source of the vehicle 1 . The battery 5 includes a battery case and a plurality of battery modules accommodated in the battery case. A battery module comprises a plurality of battery cells connected in series or in parallel.
The battery 5 includes a positive terminal BP connected to the first positive terminal P1 of the third power converter 23 and a negative terminal BN connected to the first negative terminal N1. A positive terminal BP and a negative terminal BN of the battery 5 are connected to positive terminals and negative terminals of a plurality of battery modules connected in series in the battery case.

The electronic control unit 6 controls the operation of each of the first rotating electrical machine 2 and the second rotating electrical machine 3 . For example, the electronic control unit 6 is a software functional section that functions when a predetermined program is executed by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) comprising a processor such as a CPU, a ROM (Read Only Memory) for storing programs, a RAM (Random Access Memory) for temporarily storing data, and an electronic circuit such as a timer. . At least part of the electronic control unit 6 may be an integrated circuit such as an LSI (Large Scale Integration).

For example, the electronic control unit 6 executes current feedback control or the like using the current detection value of the first rotating electric machine 2 and the current target value according to the torque command value of the first rotating electric machine 2, and the gate drive unit 7 Generate the input control signal.
For example, the electronic control unit 6 performs current feedback control or the like using a current detection value of the second rotating electric machine 3 and a current target value according to the regeneration command value of the second rotating electric machine 3, and the gate drive unit 7 inputs Generate a control signal to
The control signal is a signal indicating the timing to turn on (conduct)/off (cut off) the transistors UH, VH, WH, UL, VL, and WL of each of the first power conversion unit 21 and the second power conversion unit 22. be. For example, the control signal is a pulse width modulated signal or the like.

The electronic control unit 6 controls bidirectional power conversion of step-up and step-down of the third power converter 23 . For example, the electronic control unit 6 uses the current target value according to the step-up voltage command when the third power conversion unit 23 is stepped up or the step-down voltage command when the third power conversion unit 23 is stepped down, and inputs it to the gate drive unit 7. Generate a control signal to The control signal is a signal indicating the timing for turning on (conducting)/off (cutting off) the transistors S1 and S2 of the third power converter 23 .

The gate drive unit 7 actually turns on the transistors UH, VH, WH, UL, VL, and WL of each of the first power conversion section 21 and the second power conversion section 22 based on the control signal received from the electronic control unit 6. It generates a gate signal for driving (conducting)/off (blocking). For example, the gate signal is generated by amplifying and level-shifting the control signal.
The gate drive unit 7 generates a gate signal for turning on (conducting)/off (cutting off) each of the first transistor S1 and the second transistor S2 of the third power converter 23 . For example, the gate drive unit 7 generates a gate signal having a duty ratio corresponding to a step-up voltage command during boosting of the third power conversion section 23 or a step-down voltage command during regeneration of the third power conversion section 23 . The duty ratio is the ratio of the ON times of the first transistor S1 and the second transistor S2.

<Drive unit>
FIG. 3 is a cross-sectional view of part of the drive unit 10 according to the embodiment, showing a state (first state) before the first case 31 and the second case 32 are integrated. FIG. 4 is a cross-sectional view of part of the drive unit 10 according to the embodiment, showing a state (second state) after the first case 31 and the second case 32 are integrated. FIG. 5 is an enlarged view of the connection member 46 shown in FIG. FIG. 6 is a cross-sectional view of part of the drive unit 10 according to the embodiment, showing a separated state (third state) after the first case 31 and the second case 32 are integrated.
As shown in FIG. 1, the drive unit 10 accommodates the power control unit 4, the rotating electrical machine unit 8 of the first rotating electrical machine 2 and the second rotating electrical machine 3, and the first rotating electrical machine 2 and the second rotating electrical machine 3. A first case 31 and a second case 32 that accommodates the power control unit 4 are provided.

The outer shape of the first case 31 is, for example, a bottomed cylindrical shape having a mount 33 on which the second case 32 is arranged. The outer shape of the second case 32 is, for example, a rectangular box shape. The first case 31 and the second case 32 arranged on the mounting table 33 are integrally fixed.
Inside the first case 31, the respective rotating shafts 2a and 3a of the first rotating electrical machine 2 and the second rotating electrical machine 3 are arranged coaxially with each other. Each rotating shaft 2a, 3a is connected to a transmission (not shown). The transmission is housed in, for example, a transmission case (not shown) fixed to the first case 31 . Each rotating shaft 2a, 3a passes through the transmission case and is connected to the transmission.

The mounting base 33 has two three-phase connectors 28 and 29 arranged integrally. The two 3-phase connectors 28 and 29 electrically connect, for example, two 3-phase bus bars protruding from the second case 32 and two 3-phase bus bars arranged inside the first case 31. .
As shown in FIGS. 1, 2, and 3, two three-phase bus bars protruding from the second case 32 are connected to three-phase terminals Ua, Va, and Wa of the first power converter 21. A three-phase first control-side bus bar 41 and a three-phase second control-side bus bar 42 connected to each of the three phase terminals Ub, Vb, and Wb of the second power converter 22 . Each of the three-phase first control-side busbars 41 and second control-side busbars 42 is fixed inside the second case 32 by a molding 43 made of an electrically insulating material such as resin. there is
The two 3-phase bus bars arranged inside the first case 31 are a 3-phase first electric machine-side bus bar 44 connected to each of the 3-phase terminals U1, V1, W1 of the first rotating electric machine 2, and a three-phase second electric machine side bus bar 45 connected to each of the three-phase terminals U2, V2, and W2 of the two-rotating electric machine 3. FIG. Each of the three-phase first electric machine-side bus bar 44 and second electric machine-side bus bar 45 is connected to two three-phase connectors 28 and 29 inside the first case 31 .
Each bus bar 41, 42, 44, 45 is, for example, a conductive plate member such as a copper plate.

As shown in FIGS. 4 and 5, each of the three-phase connectors 28 and 29 has, for example, the same configuration, and includes three conductive connection members 46 and a common molding 47 for fixing the three connection members 46. and The molded body 47 is made of, for example, an electrically insulating material such as resin.
The three connecting members 46 of the 3-phase connector 28 electrically connect the 3-phase first control-side bus bar 41 and the 3-phase first electrical machine-side bus bar 44 . The three connection members 46 of the three-phase connector 29 electrically connect the three-phase second control-side bus bar 42 and the three-phase second electrical machine-side bus bar 45 .
For example, each connecting member 46 has an H-shaped cross section. Each connecting member 46 includes a pair of plate-like members 51 and a connecting member 52 connecting central portions of the pair of plate-like members 51 to each other.
A pair of first end portions 51a of the ends on both sides from the respective center portions of the pair of plate-like members 51 are inserted into the three insertion ports 28a and 29a of the three-phase connectors 28 and 29, respectively. By sandwiching the side bus bars 41 and 42 from both sides in the thickness direction, the control side bus bars 41 and 42 are electrically connected to the connection members 46 and mechanically fixed. Each of the pair of first end portions 51a has a protruding portion 51b protruding in a direction facing each other. Each of the pair of first end portions 51a contacts each of the control-side bus bars 41 and 42 via the projecting portion 51b.
A pair of second end portions 51c of the end portions on both sides from the center portion of the pair of plate-like members 51 sandwich and fix the electric machine-side bus bars 44 and 45 from both sides in the thickness direction.

As shown in FIGS. 3 , 4 and 6 , the drive unit 10 includes a screw member 62 mounted on a screw mounting portion 61 provided on the mounting base 33 of the first case 31 . A threaded hole 61 a into which the threaded member 62 is inserted is formed in the threaded mounting portion 61 . The screw member 62 includes, for example, a shaft portion 62a formed with a screw thread to be fitted to the screw mounting portion 61, a head portion 62b provided at the end of the shaft portion 62a, and an axial direction perpendicular to the head portion 62b. and a flange portion 62c projecting in the direction. The axial direction of the shaft portion 62a of the screw member 62 is parallel to the Z-axis direction, for example.
The screw mounting portion 61 is formed so that the entire shaft portion 62a of the screw member 62 can be mounted. For example, the depth of the screw hole 61 a of the screw mounting portion 61 is greater than the length LA of the shaft portion 62 a of the screw member 62 . The length LA of the shaft portion 62a of the screw member 62 is determined by the tips 41a and 42a of the control-side bus bars 41 and 42 inserted into the connection members 46 and the protruding portions of the pair of first end portions 51a of the connection members 46. 51b and the contact points 41b, 42b of the control-side bus bars 41, 42, respectively.

The second case 32 has a support portion 72 formed with a through hole 71 axially facing the head portion 62b of the screw member 62 mounted on the screw mounting portion 61 of the mounting base 33 of the first case 31 . The size of the through hole 71 is larger than the head portion 62 b of the screw member 62 . For example, when the outer shape of the head 62b is cylindrical and the outer shape of the through-hole 71 is circular when viewed from the axial direction, the outer diameter of the head 62b is smaller than the diameter of the through-hole 71 .
A head portion 62b of the screw member 62 is formed with a tool mounting portion 62d to which an appropriate tool such as a screwdriver or a hexagonal wrench for rotating the screw member 62 around its axis is mounted through the through hole 71. As shown in FIG. For example, if the screw member 62 is a hexagon socket bolt that can be rotated around its axis by a hexagon wrench, the head 62b is provided with a tool mounting portion 62d having a hexagonal hole into which the hexagon wrench is inserted. there is

The size of the flange portion 62 c of the screw member 62 is larger than the through hole 71 . For example, when the outer shape of the flange portion 62c is an annular plate projecting in the direction orthogonal to the axial direction from the head portion 62b, and the outer shape of the through hole 71 is circular when viewed from the axial direction, the outer shape of the flange portion 62c The diameter is larger than the diameter of the through hole 71 .
In the state in which the first case 31 and the second case 32 are integrated, the flange portion 62c of the screw member 62 and the opening end 71a of the through hole 71 on the mounting base 33 side are arranged in a predetermined axial direction of the shaft portion 62a. only a distance apart.
When the screw member 62 is rotated in a direction in which the screw member 62 is removed from the screw mounting portion 61 in a state in which the first case 31 and the second case 32 are integrated, the flange portion 62c is opened at the opening end of the through hole 71 on the mounting base 33 side. 71a to displace the support portion 72 of the second case 32 away from the mount 33 of the first case 31 along the axial direction of the shaft portion 62a. Accordingly, the control-side bus bars 41 and 42 inserted into the connection members 46 of the three-phase connectors 28 and 29 are displaced so as to be removed from the connection members 46 .

A method of assembling the drive unit 10 will be described below.
First, as shown in FIG. 3 , in the first step in the first state in which the first case 31 and the second case 32 are separated, the screw member 62 is attached to the screw attachment portion 61 of the mounting base 33 . In this first state, for example, the entire shaft portion 62a of the screw member 62 is inserted into the screw hole 61a, and the head portion 62b is in contact with the open end of the screw hole 61a.
Next, as shown in FIG. 4, from the first state to the second state in which the first case 31 and the second case 32 are integrated, in the case of the step (second step), from the second case 32 The protruding control-side bus bars 41, 42 are inserted into the connection members 46 of the three-phase connectors 28, 29 of the first case 31 (mounting table 33) along the Z-axis direction (second step). At this time, the first case 31 (mounting The platform 33) and the second case 32 approach each other along the Z-axis direction.
As shown in FIGS. 4 and 5, the control-side bus bars 41 and 42 are electrically connected to the connection members 46 when the control-side bus bars 41 and 42 are inserted into the connection members 46 by the maximum amount. and mechanically fixed. Accordingly, the first case 31 and the second case 32 are integrally connected. As described above, in the second state in which the first case 31 and the second case 32 are integrated, the flange portion 62c of the screw member 62 and the open end 71a of the through hole 71 on the mounting base 33 side are separated from each other. , are separated by a predetermined distance in the axial direction of the shaft portion 62a.

Further, in the case of the step (third step) in which the second state shifts to the third state in which the first case 31 and the second case 32 are separated after being integrated as shown in FIG. 6, an appropriate tool is used. The tool mounting portion 62d of the head portion 62b of the screw member 62 is mounted through the through hole 71 of the support portion 72 of the second case 32, and the screw member 62 is rotated in a direction to be removed from the screw mounting portion 61. FIG. As a result, the flange portion 62c of the screw member 62 comes into contact with the opening end 71a of the through-hole 71 on the side of the mount 33, and the support portion 72 of the second case 32 is moved along the axial direction of the shaft portion 62a to the first case 31. is displaced away from the mounting base 33 of the . Accordingly, the control-side bus bars 41 and 42 inserted into the connection members 46 of the three-phase connectors 28 and 29 are displaced so as to be removed from the connection members 46 .
When the control-side bus bars 41 and 42 are separated from the connection members 46, the electrical connection and mechanical fixation with the connection members 46 are released. Accordingly, the integral connection between the first case 31 and the second case 32 is released.

As described above, the drive unit 10 of the embodiment includes the screw member 62 that is attached to the first case 31 and has the flange portion 62c that is larger than the through hole 71 of the second case 32. And the screw member 62 rotated in the direction of detaching from the first case 31 in the connected state of the second case 32 displaces the second case 32 in the direction away from the first case 31 . As a result, the disconnection of the first case 31 and the second case 32 and the electrical connection between the control-side bus bars 41 and 42 and the electric machine-side bus bars 44 and 45 can be achieved while suppressing the complication of the configuration. Connection and release of mechanical fixation can be easily performed.

The length LA of the shaft portion 62a of the screw member 62 is larger than the maximum distance D between the tips 41a, 42a of the control-side bus bars 41, 42 and the contacts 41b, 42b. Until the shaft portion 62a of the threaded member 62 is removed from the threaded mounting portion 61, the contact between each connection member 46 and each control side bus bar 41, 42 is properly released. As a result, the control-side bus bars 41 and 42 and the electrical machine-side bus bars 44 and 45 can be easily electrically connected and mechanically fixed to each other through the connecting members 46 in spite of the simple structure. can be done.

In the state in which the first case 31 and the second case 32 are integrated, the flange portion 62c of the screw member 62 and the opening end 71a of the through hole 71 on the mounting base 33 side are arranged in a predetermined axial direction of the shaft portion 62a. The distance prevents restriction of electrical connection and mechanical fixation between the control-side bus bars 41 and 42 and the electrical machine-side bus bars 44 and 45 via the connecting members 46. can.

Since the two three-phase connectors 28 and 29 are arranged integrally, the screw member 62 can be arranged more freely than when the two three-phase connectors 28 and 29 are arranged independently. can be improved. For example, the screw member 62 can be arranged in an appropriate empty space formed by integrating the first case 31 and the second case 32, such as a space where the support portion 72 of the second case 32 is provided. can be done.

According to the method of assembling the drive unit 10 of the embodiment, after the screw member 62 is attached to the first case 31, the head portion 62b of the screw member 62 faces the through-hole 71 of the second case 32 and each control-side bus bar is installed. 41, 42 and each connecting member 46 are electrically connected and mechanically fixed. Therefore, when the first case 31 and the second case 32 are connected, the flange portion 62c of the screw member 62, which is rotated in the direction of detaching from the first case 31, displaces the second case 32 in the direction away from the first case 31. Let As a result, the connection between the first case 31 and the second case 32 is released, and the control-side bus bars 41 and 42 and the electric machine-side bus bars 44 are connected via the connection members 46, while preventing the configuration from becoming complicated. , 45 can be easily electrically connected and mechanically fixed.

(Modification)
Modifications of the embodiment will be described below. It should be noted that the same parts as those of the above-described embodiment are denoted by the same reference numerals, and descriptions thereof are omitted or simplified.

(First modification)
In the embodiment described above, the size of the flange portion 62c of the screw member 62 is larger than that of the through hole 71, but it is not limited to this. For example, a member larger than the through hole 71 may be provided instead of the flange portion 62c.
FIG. 7 is a cross-sectional view of part of the drive unit 10A in the first modified example of the embodiment, showing a state after the first case 31 and the second case 32 are integrated.
As shown in FIG. 7, the drive unit 10A of the first modified example includes a screw member 62A of the first modified example instead of the screw member 62 of the embodiment.
The screw member 62A of the first modified example includes, for example, a shaft portion 62a, a head portion 62b, a flange portion 62e, and a mounting member 81 mounted on the head portion 62b and larger than the through hole 71.
The flange portion 62e protrudes in a direction perpendicular to the axial direction than the head portion 62b. The size of the flange portion 62 e is smaller than that of the through hole 71 . For example, when the outer shape of the flange portion 62e is an annular plate that protrudes in the direction perpendicular to the axial direction from the head portion 62b, and the outer shape of the through hole 71 is circular when viewed from the axial direction, the outer shape of the flange portion 62e The diameter is smaller than the diameter of the through hole 71 .
The mounting member 81 is, for example, a washer or a C-shaped ring. For example, when the outer shape of the mounting member 81 is an annular plate projecting in the direction orthogonal to the axial direction than the head portion 62b, the outer diameter of the mounting member 81 is larger than the diameter of the through-hole 71 .
In the state in which the first case 31 and the second case 32 are integrated, the mounting member 81 mounted on the head portion 62b of the screw member 62A and the opening end 71a of the through hole 71 on the mounting base 33 side are separated from each other. , are separated by a predetermined distance in the axial direction of the shaft portion 62a.

(Second modification)
In the above-described embodiment, the screw member 62 is provided with the flange portion 62c larger than the through hole 71, but the present invention is not limited to this. For example, the flange portion 62c may be omitted.
FIG. 8 is a cross-sectional view of part of the drive unit 10B in the second modified example of the embodiment, showing a state after the first case 31 and the second case 32 are integrated.
As shown in FIG. 8, the drive unit 10B of the second modification includes a screw member 62B of the second modification instead of the screw member 62 of the embodiment.
A screw member 62B of the second modification includes, for example, a shaft portion 62a and a head portion 62f larger than the through hole 71. As shown in FIG. The head 62f is provided with a tool mounting portion 62d to which a suitable tool is mounted. For example, when the outer shape of the head 62f is columnar and the outer shape of the through-hole 71 is circular when viewed from the axial direction, the outer diameter of the head 62f is larger than the diameter of the through-hole 71 .
When the first case 31 and the second case 32 are integrated, the head portion 62f of the screw member 62B and the opening end 71a of the through hole 71 on the mounting base 33 side are aligned in the axial direction of the shaft portion 62a. are separated from each other by a predetermined distance.
Further, the support portion 72 of the second case 32 may be formed with a recess 72a into which a part of the head portion 62f of the screw member 62B is inserted when the first case 31 and the second case 32 are connected.

(Other modifications)
In the above-described embodiment, the control-side bus bars 41, 42 protruding from the second case 32 are inserted into and removed from the connection members 46 of the three-phase connectors 28, 29 provided on the first case 31, but this is not the only option. not.
For example, instead of the combination of each control side bus bar 41, 42 and each connection member 46, an insertion plug (terminal) having an appropriate shape such as a flat blade type or a pin type, and a plug into which the insertion plug (terminal) is inserted and removed. The control-side bus bars 41, 42 and the electrical machinery-side bus bars 44, 45 may be electrically connected and mechanically fixed by combination with the supports.

Also, for example, each of the three-phase connectors 28 and 29 may be provided on the second case 32 . In this case, the connection members 46 of the three-phase connectors 28 and 29 may be connected to the control-side bus bars 41 and 42 inside the second case 32 . The electric machine-side bus bars 44, 44 projecting from the first case 31 or plugs (terminals) of appropriate shape may be inserted into and removed from the connection members 46 of the three-phase connectors 28, 29 provided in the second case 32. .

In the embodiment described above, the screw member 62 is attached to the screw attachment portion 61 of the mounting base 33 of the first case 31, but the present invention is not limited to this.
For example, the screw member 62 may be attached to a screw attachment portion provided at an appropriate portion of the second case 32 . In this case, the first case 31 may have a portion formed with a through hole facing the head portion 62b of the screw member 62 attached to the screw attachment portion of the second case 32 in the axial direction.

Embodiments of the invention are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... vehicle, 2... 1st rotating electric machine (rotating electric machine), 2a... rotating shaft, 3... 2nd rotating electric machine (rotating electric machine), 3a... rotating shaft, 4... electric power control unit, 8... rotating electric machine unit, 10... Drive unit 28... 3-phase connector (connecting member) 29... 3-phase connector (connecting member) 31... First case (first housing) 32... Second case (second housing) 41... Second 1 control side bus bar (second conductive member, terminal member), 42... second control side bus bar (second conductive member, terminal member), 41a, 42a... tip, 41b, 42b... contact, 44... first electric machine side bus bar (First conductive member) 45 Second electric machine side bus bar (first conductive member) 46 Connection member (receiving member) 61 Screw mounting portion 62 Screw member 62a Shaft 62b Head , 62c... flange portion, 62f... head portion, 71... through hole, 71a... opening end, 72... support portion, 81... attachment member, D... maximum distance, LA... length, U1, V1, W1, U2, V2 , W2... each terminal, Ua, Va, Wa, Ub, Vb, Wb... each phase terminal.

Claims (4)

at least one rotating electric machine;
a power control unit that controls power exchange of the at least one rotating electric machine;
a first housing and a second housing respectively housing the at least one rotating electric machine and the power control unit;
A plug for electrically connecting and mechanically fixing a first conductive member connected to the input/output portion of the at least one rotating electric machine and a second conductive member connected to the input/output portion of the power control unit. a connecting member of the type;
a screw member having a head facing a through-hole formed in a shaft portion and a through-hole formed in the second housing;
The drive unit, wherein the screw member includes a flange portion larger than the through hole, the head larger than the through hole, or a mounting member attached to the head and larger than the through hole. The connection member includes a terminal member and a receiving member into which the terminal member is inserted,
The screw mounting portion is capable of mounting the entire shaft portion,
2. The drive according to claim 1, wherein the length of said shaft portion is greater than the maximum distance between the tip of said terminal member inserted into said receiving member and the contact points of said receiving member and said terminal member. unit. In a state where the first housing and the second housing are integrally connected, the flange portion, the head or the mounting member larger than the through hole, and an opening of the through hole on the first housing side. 3. A drive unit as claimed in claim 1 or 2, wherein the ends are separated by a predetermined distance in the axial direction of the shank. A method for assembling a drive unit according to any one of claims 1 to 3, comprising:
mounting the screw member to the screw mounting portion formed in the first housing in the separated state of the first housing and the second housing;
While the head of the screw member faces the through hole formed in the second housing, the connection member electrically connects the first conductive member and the second conductive member, and mechanically connects the first conductive member and the second conductive member. A method of assembling a drive unit, comprising:

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