JP2017060225A - Inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an inverter device that eliminates the need to provide an inverter case with an interlock mechanism, is low in cost, and is able to minimize an arrangement space.SOLUTION: A hole cover 85 covering a service hole 82 is fixed to an inverter case 80 by fixing a bolt 88 composing a fixing part, and is released from its being fixed to the inverter case 80 by releasing the bolt 88. A case-side connector 83 is arranged such that when a line-side connector 47 has been connected to the case-side connector 83 in positional relation between the line-side connector 47 and the bolt 88, the line-side connector 47 blocks release of the bolt 88, and when the line-side connector 47 is detached from the case-side connector 83, release of the bolt 88 is not blocked.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an inverter device that performs conversion between DC power and AC power of a DC power supply.

  The inverter device has a switching element unit accommodated in, for example, an inverter case, and converts DC power from a power line connected to a DC power source into AC power by the switching element unit, and operates with an AC such as a rotating electrical machine. It is configured to drive the equipment.

  In such an inverter device, while the DC power from the DC power supply is being supplied, the operator removes the inverter cover, etc., so that the operator can electrically connect the power supply line and the switching element unit inside the inverter case. There is a risk of electric shock when touching the connection. In order to prevent this, it is common to provide an interlock mechanism that stops the supply of DC power from a DC power source when there is a possibility that an operator may contact the connection part inside the inverter case. is there.

  As an inverter device provided with an interlock mechanism, for example, in a power conversion device described in JP-A-2015-97164 (Patent Document 1), an interlock mechanism (4) for stopping power supply from a power source (12). The connector cover (30) provided with a cover portion (6) has a configuration in which the fastening member (5a) is covered from the fastening direction. Thus, the connector cover (30) is removed, and the main body cover (20) cannot be removed unless the power supply from the power source (12) is stopped.

  The power converter does not need to be provided with another interlock mechanism in the main body cover (20) due to the above configuration, but in order to realize this, the shielding portion (6) that is originally unnecessary is provided in the connector cover (30). Since it is necessary to add, the manufacturing cost corresponding to the provision of the shielding part increases, and there is a concern that it is necessary to secure a space for arranging the newly provided shielding part.

Japanese Patent Laying-Open No. 2015-97164

  Therefore, it is desired to realize an inverter device that eliminates the need for providing an interlock mechanism in the inverter case, is inexpensive, and can keep the arrangement space small.

  According to the present invention, a characteristic configuration of an inverter device that performs conversion between DC power and AC power of a DC power source includes a switching element unit that performs switching for conversion between DC power and AC power, and the switching An inverter case that accommodates the element unit, and a case-side connector is fixed to an outer surface of the outer wall portion of the inverter case, and the case-side connector is provided at an end portion of a power supply line connected to the DC power source. The line-side connector is connected, and a service hole that is an opening that communicates the inside and the outside of the inverter case is formed in the outer wall, and the service hole is closed by a removable hole cover, A first bus bar electrically connected to the case side connector and electrically connected to the switching element unit; The connecting portion with the second bus bar is disposed inside the service hole in the inverter case, and the hole cover is fixed to the inverter case by fixing the fixing portion, and the fixing portion is released. The fixed state to the inverter case is released by setting the state, and the positional relationship between the line side connector and the fixed portion is in the released state when the line side connector is connected to the case side connector. The case-side connector so that the line-side connector is in a positional relationship that prevents the fixing portion from being released when the line-side connector is detached from the case-side connector. Is at the point where it is arranged.

  According to this characteristic configuration, in a state where the line side connector is coupled to the case side connector, power is supplied to the connection portion, but the hole cover cannot be removed. Therefore, there is no risk of electric shock because the operator cannot contact the connecting portion. In a state where the line side connector is detached from the case side connector, the hole cover can be removed. Therefore, the operator can contact the connecting portion, but there is no risk of electric shock because the connecting portion is electrically disconnected from the DC power source.

  In this way, the positional relationship between the line side connector and the fixed portion is such that the line side connector prevents the fixed portion from being released when the line side connector is connected to the case side connector, and the line side connector is connected to the case side. The case side connector is arranged so that the fixed portion is in a position that is not prevented from being released when the connector is removed from the connector, so that it is not necessary to provide an interlock mechanism in the inverter case and is inexpensive. Thus, it is possible to realize an inverter device that can keep the arrangement space small.

Schematic diagram showing the schematic configuration of the vehicle Circuit diagram of inverter device Perspective view of vehicle drive device Plan view of vehicle drive device Main part explanatory diagram of the inverter device Perspective view of vehicle drive device Plan view of vehicle drive device

An embodiment of the inverter device 3 will be described with reference to the drawings.
In the present embodiment, as shown in FIG. 1, an example in which the inverter device 3 is applied to one that drives the rotating electrical machine MG of the vehicle drive device 1 will be described. Here, the vehicle drive device 1 is a vehicle drive device (hybrid vehicle drive device) for driving a vehicle (hybrid vehicle) provided with both the internal combustion engine E and the rotating electrical machine MG as a drive force source for the wheels W. It is. Specifically, the vehicle drive device 1 is configured as a drive device for a 1-motor parallel type hybrid vehicle. In the following description, terms relating to the direction and position of each member are concepts including a state having a difference due to an error that can be allowed in manufacturing. Moreover, the direction about each member represents the direction in the state in which they were assembled | attached to the drive device 1 for vehicles.

  In the present embodiment, the “rotary electric machine” is used as a concept including any of a motor (electric motor), a generator (generator), and a motor / generator that functions as both a motor and a generator as necessary. Yes.

1. Schematic Configuration of Vehicle Drive Device As shown in FIG. 1, the vehicle drive device 1 includes an input shaft I as an input member that is drivingly connected to the internal combustion engine E, and an output as an output member that is drivingly connected to the wheels W. The shaft O, the rotating electrical machine MG, and the speed change mechanism TM are provided. In the present embodiment, the vehicle drive device 1 includes an engagement device CL, a gear mechanism C, and a differential gear device DF. The engaging device CL, the rotating electrical machine MG, the speed change mechanism TM, the gear mechanism C, and the differential gear device DF are provided in a power transmission path that connects the input shaft I and the output shaft O. These are provided in the order described from the input shaft I side. These are housed in the transaxle case 2.

  “Drive coupling” means a state in which two rotating elements are coupled so as to be able to transmit a driving force (synonymous with torque). This concept includes a state in which the two rotating elements are connected so as to rotate integrally, and a state in which the driving force is transmitted through one or more transmission members. Such transmission members include various members (shafts, gear mechanisms, belts, etc.) that transmit rotation at the same speed or at different speeds, and engaging devices (frictions) that selectively transmit rotation and driving force. Engagement devices, meshing engagement devices, etc.).

  As shown in FIG. 1, an input shaft (drive device input shaft) I is drivingly connected to an internal combustion engine E. The internal combustion engine E is a prime mover (such as a gasoline engine or a diesel engine) that is driven by combustion of fuel inside the engine to extract power. In the present embodiment, the input shaft I is drivingly connected to the output shaft (crankshaft or the like) of the internal combustion engine E. The output shaft of the internal combustion engine E and the input shaft I may be drivingly connected via a damper or the like.

  The engagement device CL is provided in a power transmission path that connects the input shaft I and the rotating electrical machine MG. The engagement device CL selectively connects the input shaft I (internal combustion engine E) and the rotating electrical machine MG. The engagement device CL functions as an internal combustion engine separation engagement device that separates the internal combustion engine E from the wheel W. In the present embodiment, the engagement device CL is configured as a hydraulically driven friction engagement device. An electromagnetically driven friction engagement device, a meshing engagement device, or the like may be used.

  The rotating electrical machine MG includes a stator St fixed to the transaxle case 2 and a rotor Ro that is rotatably supported on the radial inner side of the stator St. The rotating electrical machine MG can perform a function as a motor (electric motor) that generates power upon receiving power supply and a function as a generator (generator) that generates power upon receiving power supply. . The rotating electrical machine MG is electrically connected to a power storage device B (battery, capacitor, or the like) as a DC power source via the inverter device 3. Note that the power storage device B has a higher voltage (100 [100], for example, than an auxiliary battery (for example, 12 [V]) as a power source of auxiliary equipment such as an air conditioner compressor and audio equipment provided in the vehicle. V] or more) is used. The rotating electrical machine MG receives power from the power storage device B and runs in power, or supplies power stored in the power storage device B with power generated by the torque of the internal combustion engine E or the inertial force of the vehicle. The rotor Ro of the rotating electrical machine MG is drivingly connected so as to rotate integrally with the intermediate shaft M. The intermediate shaft M is an input shaft (transmission input shaft) of the speed change mechanism TM.

  In the present embodiment, the speed change mechanism TM is an automatic stepped speed change mechanism that includes a plurality of gear mechanisms and a plurality of speed change engagement devices and is capable of switching a plurality of speed stages having different speed ratios. As the speed change mechanism TM, an automatic continuously variable speed change mechanism capable of changing the speed ratio steplessly, a manual stepped speed change mechanism capable of switching a plurality of speed stages having different speed ratios, a single fixed speed ratio. You may use the constant transmission mechanism provided with the gear stage. The speed change mechanism TM changes the rotation and torque input to the intermediate shaft M according to the speed change ratio at each time point, converts the torque, and transmits the torque to the speed change output gear Go of the speed change mechanism TM.

  The transmission output gear Go is drivingly connected to a gear mechanism (counter gear mechanism) C. The gear mechanism C includes a first gear G1 and a second gear G2 that are respectively formed on a common shaft member. The first gear G1 meshes with the speed change output gear Go of the speed change mechanism TM. The second gear G2 meshes with the differential input gear Gi of the differential gear device DF. In the present embodiment, the second gear G2 is disposed on the first axial direction side (internal combustion engine E side) with respect to the first gear G1. The second gear G2 is formed with a smaller diameter (less teeth) than the first gear G1.

  The differential gear device (output differential gear device) DF is drivingly connected to the wheel W via the output shaft O. The differential gear device DF includes a differential input gear Gi and a differential main body portion (a main body portion of the differential gear device DF) connected to the differential input gear Gi. The differential main body portion includes a plurality of bevel gears that mesh with each other and a differential case that accommodates them, and plays a central role in the differential mechanism. The differential gear device DF transmits rotation and torque input to the differential input gear Gi from the rotating electrical machine MG side via the speed change mechanism TM and the gear mechanism C, and outputs two left and right output shafts O ( That is, it is distributed and transmitted to the two left and right wheels W). Accordingly, the vehicle drive device 1 can cause the vehicle to travel by transmitting the torque of at least one of the internal combustion engine E and the rotating electrical machine MG to the wheels W.

2. Schematic Configuration of Inverter Device The inverter device 3 is a device that converts DC power and AC power, and is connected between the power storage device B and the rotating electrical machine MG as shown in FIG.
The inverter device 3 includes a switching element unit 30 and a smoothing capacitor 36. The switching element unit 30 is disposed between the smoothing capacitor 36 and the rotating electrical machine MG. Smoothing capacitor 36 is arranged between power storage device B and switching element unit 30.

  The power storage device B, the switching element unit 30, and the smoothing capacitor 36 are electrically connected to each other via the connection portion 84. Specifically, the connection portion 84 includes a first bus bar 62 electrically connected to the case side connector 83, a second bus bar 63 electrically connected to the switching element unit 30, the smoothing capacitor 36, A third bus bar 64 that is connected to each other is connected.

  A smoothing capacitor is connected between a positive electrode and a negative electrode (for example, ground) of the power storage device B as a DC power source via a DC power line 61, a first bus bar 62, a connection portion 84, and a third bus bar 64 that constitute the first wiring member 60. 36 is connected. Further, the two switching elements 33 are connected in series between the positive electrode and the negative electrode of the power storage device B via the DC power line 61, the first bus bar 62, the connection portion 84, and the second bus bar 63. Three lines are connected in parallel. These three lines correspond to the three phases (U phase, V phase, W phase) of the stator coil of the rotating electrical machine MG (stator St). Instead of each switching element 33 in the example of FIG. 2, a set of two switching elements 33 connected in parallel may be used.

  The collector of the switching element 33 on the upper side of each phase is connected to the connecting portion 84 via the second bus bar 63 for positive electrode, and is connected to the positive electrode of the power storage device B via the first bus bar 62 for positive electrode and the DC power line 61. Connected to the positive electrode of the smoothing capacitor 36 via the third bus bar 64 for positive electrode. The emitter of the switching element 33 on the upper stage side of each phase is connected to the collector of the switching element 33 on the lower stage side. The emitter of the switching element 33 on the lower side of each phase is connected to the connecting portion 84 via the second bus bar 63 for negative electrode, and to the negative electrode of the power storage device B via the first bus bar 62 for negative electrode and the DC power line 61. Connected to the negative electrode of the smoothing capacitor 36 through the third bus bar 64 for negative electrode. A diode is connected in parallel between the emitter and collector of each switching element 33. The diode is used as an FWD (Free Wheel Diode). In this example, an IGBT (Insulated Gate Bipolar Transistor) is used as the switching element 33. Note that a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or the like may be used as the switching element 33.

  The pair of switching elements 33 for each phase are relay terminals for each phase via a fourth bus bar 72 for each phase that constitutes the second wiring member 70 at the intermediate point (between the emitter and the collector). 52. Around the relay terminal 52 for each phase, a current sensor for detecting a current flowing through the stator coil for each phase of the rotating electrical machine MG is provided. The relay terminal 52 for each phase is connected to a stator coil for each phase of the rotating electrical machine MG via an AC power line 76 constituting the second wiring member 70. Note that the gate of each switching element 33 is connected to a drive circuit provided on the control board 34 included in the unit constituting the switching element unit 30 and is individually controlled to be switched.

  As described above, switching element unit 30 performs power conversion between DC power transferred to and from power storage device B and AC power (three-phase AC power) transferred to and from rotating electrical machine MG. Do.

  The power storage device B has a high voltage of 100 [V] or more as described above. Therefore, even when the supply of power from the power storage device B to the rotating electrical machine MG is stopped, the voltage across the terminals of the smoothing capacitor 36 does not decrease immediately. For example, when performing maintenance or the like of the inverter device 3, it is necessary to wait until the potential of the smoothing capacitor 36 is sufficiently lowered. This waiting time is preferably as short as possible.

Therefore, the inverter device 3 includes a discharge circuit 91 in parallel with the smoothing capacitor 36 so that the remaining charge of the smoothing capacitor 36 can be discharged quickly.
The discharge circuit 91 is configured as a series circuit of a discharge resistor 92 and an FET (field effect transistor) functioning as a discharge control switch 93.
The discharge control switch 93 is turned on by an interlock mechanism 90 that detects that the line-side connector 47 has been removed from the case-side connector 83.
When the discharge control switch 93 is turned on, the discharge circuit 91 short-circuits the positive electrode and the negative electrode of the smoothing capacitor 36. As a result, the residual charge accumulated in the smoothing capacitor 36 is consumed by the discharge resistor 92. In the present embodiment, the discharge circuit 91 is provided on the control board 34.

3. Specific Structure of Inverter Device In the present embodiment, the switching element unit 30 and the smoothing capacitor 36 are unitized including the control board 34 and are accommodated in the inverter case 80 (see FIG. 5).
The switching element unit 30 is a TPM (Trusted Platform Module) in which a plurality of switching elements 33 are unitized.

  Specifically, as shown in FIG. 5, the switching element unit 30 has a flat base plate 32, a plurality of switching elements 33 are fixed on the base plate 32, and the periphery is molded and integrated with resin. ing. The base plate 32 is made of a material having high thermal conductivity (for example, a metal material such as copper or aluminum), and also functions as a heat sink. A diode is also fixed to the base plate 32.

  Fins 32 a are formed on a surface (an element disposition surface) opposite to a surface (an element disposition surface) on which the switching element 33 is disposed on the base plate 32. The fins 32a are formed so as to stand, for example, along the normal direction of the base plate 32. As the fins 32a, various shapes such as a plate shape and a pin shape can be used. A control board 34 is disposed on the opposite side of the switching element 33 from the base plate 32 side. The control board 34 is arranged in parallel with the base plate 32. The switching element unit 30 is unitized so as to have a flat rectangular parallelepiped shape as a whole.

  Smoothing capacitor 36 smoothes (suppresses fluctuations) DC power delivered between power storage device B and switching element unit 30. As the smoothing capacitor 36, for example, a film capacitor made of a synthetic resin, a ceramic capacitor made of an inorganic material, or the like can be used. Such a smoothing capacitor 36 has a relatively large degree of design freedom regarding its size and shape, and can be adjusted according to the size and shape of the space in which it is arranged. In this example, the smoothing capacitor 36 is formed in a rectangular parallelepiped shape (block shape) having a lower flatness than the switching element unit 30.

4). As shown in FIG. 4, in this embodiment, the transaxle case 2 includes a first case portion 21 and a second case portion 28 that are divided in the axial direction L. The first case portion 21 mainly forms an accommodation space for the speed change mechanism TM and the gear mechanism C. The second case portion 28 mainly forms a housing space for the rotating electrical machine MG and the engaging device CL. A space obtained by combining the accommodation spaces of the transmission mechanism TM, the gear mechanism C, the rotating electrical machine MG, and the engagement device CL is a closed space formed in an oil-tight manner in the transaxle case 2. . In the present embodiment, a housing space for the differential gear device DF is formed across the first case portion 21 and the second case portion 28.

  As shown in FIGS. 3 and 5, the switching element unit 30 and the smoothing capacitor 36 are accommodated in an inverter case 80. In the present embodiment, the inverter case 80 is attached to the upper part of the first case portion 21 that houses the speed change mechanism TM and the like in the transaxle case 2.

A surface of the inverter case 80 opposite to the first case portion 21 side is covered with a removable case cover 81.
In the present embodiment, the case cover 81 corresponds to the outer wall portion of the inverter case 80.

The case cover 81 is formed with a service hole 82 that is an opening that communicates the inside and the outside of the inverter case 80.
Inside the service hole 82, the first bus bar 62 electrically connected to the case side connector 83, the second bus bar 63 electrically connected to the switching element unit 30, and the smoothing capacitor 36 are electrically connected. A connecting portion 84 with the third bus bar 64 is disposed.

  An example of the connecting portion 84 is a terminal block in which a positive electrode and a negative electrode are partitioned. The first bus bar 62 for positive electrode, the second bus bar 63 for positive electrode, and the terminal at the end of the third bus bar 64 in this example are fastened together with a fastening member to the positive terminal P of this terminal block, and the negative electrode of this terminal block is The first bus bar 62 for the negative electrode, the second bus bar 63 for the negative electrode, and the terminal at the end of the third bus bar 64 in this example are further fastened together by the fastening member, and the positive electrode and the negative electrode of each bus bar are connected to the side terminal N. Each is electrically connected.

The service hole 82 is closed by a removable hole cover 85.
The case cover 81 is provided with female screw portions 87 (see FIGS. 6 and 7) at a plurality of locations around the service hole 82, in two locations across the service hole 82 in the illustrated example. The two bolts 88 as an example of the male screw portion pass through two through holes formed in the hole cover 85 and are respectively screwed into the female screw portion 87. Thereby, the hole cover 85 is configured to be fastened to the case cover 81.

The back surface of the hole cover 85 is provided with a fitting convex portion that is configured in a shape corresponding to the opening shape of the service hole 82 and is fitted into the service hole 82. When the hole cover 85 is placed on the case cover 81, the fitting convex portion of the hole cover 85 is fitted into the service hole 82. Since the hole cover 85 is positioned on the case cover 81 before the bolt 88 is fastened, the fastening work of the bolt 88 is facilitated.
The back surface of the hole cover 85 is a surface facing the service hole 82. Accordingly, the bolt 88 passes through the two through holes formed in the hole cover 85 from the surface of the hole cover 85 and is screwed into the female screw portion 87 on the back surface side of the hole cover 85.

  In this embodiment, in order to fasten the hole cover 85 and the case cover 81, a fastening member including a bolt 88 and a female screw portion 87 that are screwed to each other is fixed to fix the hole cover 85 to the inverter case 80. Part 86 is configured. In other words, the hole cover 85 is fixed to the inverter case 80 by setting the fixing portion 86 to a fixed state, and the fixing to the inverter case 80 is released by setting the fixing portion 86 to a released state.

  Further, a case side connector 83 is fixed to the case cover 81 of the inverter case 80. The line side connector 47 is connected to the case side connector 83. The line-side connector 47 is a connector provided at the end of a DC power line 61 as a power supply line connected to the power storage device B as a DC power supply.

An interlock mechanism 90 is provided between the line side connector 47 and the case side connector 83.
The interlock mechanism 90 operates a discharge circuit 91 for discharging the electric charge accumulated in the smoothing capacitor 36 when the line side connector 47 is detached from the case side connector 83. Specifically, the interlock mechanism 90 includes a signal output circuit that changes a signal state between a state in which the line side connector 47 and the case side connector 83 are connected and a state in which the line side connector 47 and the case side connector 83 are separated. Yes. The interlock mechanism 90 turns on the discharge control switch 93 of the discharge circuit 91 in response to a signal indicating that the line side connector 47 and the case side connector 83 are separated from the signal output circuit, The electric charge stored in the smoothing capacitor 36 is configured to be discharged. By operating the interlock mechanism 90 in this way, the smoothing capacitor 36 is not charged.

The case side connector 83 is arranged so that the positional relationship between the line side connector 47 and the fixing portion 86 is a specific positional relationship.
The specific positional relationship means that when the line side connector 47 is connected to the case side connector 83, the line side connector 47 prevents the fixing portion 86 from being released, and the line side connector 47 is removed from the case side connector 83. In this state, it means a positional relationship that does not prevent the fixed portion 86 from being released.

  Specifically, in the present embodiment, the specific positional relationship is such that the line-side connector 47 and the screwing shaft center of the bolt 88 overlap with each other when viewed along the screwing shaft center of the bolt 88 constituting the fastening member. In this positional relationship, the distance between the line-side connector 47 and the bolt 88 along the screwing axis is less than the distance necessary for inserting the tool for releasing the fastening of the bolt 88.

  Here, when a plurality of bolts 88 are provided, at least one of them may be in the specific positional relationship as described above. In this example, as shown in FIG. 4, the head of one of the two bolts 88 is completely covered with the line-side connector 47. For example, in order to extract the bolt 88, it is necessary to fit a tool such as a wrench or a driver for rotating the bolt head. However, since the line side connector 47 is connected to the case side connector 83, a tool for releasing the fastening of the bolt 88 cannot be inserted between the opposing surfaces of the line side connector 47 and the bolt 88. The hole cover 85 cannot be removed, and the operator cannot contact the connecting portion 84. In order to release the fastening of the bolt 88, the line side connector 47 needs to be removed from the case side connector 83 as shown in FIGS. In this case, as described above, the supply of power to the connecting portion 84 is stopped, and the electric charge stored in the smoothing capacitor 36 is discharged. The head of the bolt 88 may be partially covered by the line side connector 47. In this way, even if the line side connector 47 is connected to the case side connector 83, there is an advantage that the operator can easily recognize the presence of the bolt 88.

When the line-side connector 47 covers only a part of the bolts 88, the remaining bolts 88 not covered by the line-side connector 47 can be loosened and removed with a tool.
However, in a state where the line side connector 47 is connected to the case side connector 83, it is impossible to remove some bolts 88 covered by the line side connector 47. Moreover, since the fitting convex part of the back surface of the hole cover 85 is fitted to the service hole 82, the hole cover 85 may be rotated around the bolt 88 that has not been removed to expose the service hole 82. Impossible.

  As described above, the inverter case 80 is provided with an interlock mechanism by adopting a configuration in which the case-side connector 83 is arranged so that the positional relationship between the line-side connector 47 and the fixing portion 86 is a specific positional relationship. Can be realized, an inverter device that is inexpensive and can be arranged in a small space.

5. As shown in FIG. 2, the power storage device B, the inverter device 3, and the rotating electrical machine MG are electrically connected to each other by the first wiring member 60 and the second wiring member 70. Yes. The power storage device B and the switching element unit 30 are electrically connected by a first wiring member 60. The switching element unit 30 and the rotating electrical machine MG are electrically connected by a second wiring member 70.

  The first wiring member 60 includes a DC power line 61, a first bus bar 62, a second bus bar 63, and a third bus bar 64. DC power line 61 is configured as a cable extending from power storage device B, and connects power storage device B and line-side connector 47. The 1st bus bar 62, the 2nd bus bar 63, and the 3rd bus bar 64 are comprised with the strip | belt-shaped conductor board made from metal. The first bus bar 62, the second bus bar 63, and the third bus bar 64 include a positive bus bar and a negative bus bar.

The first bus bar 62 for each pole extends from below the line-side connector 47 in a direction orthogonal to the arrangement direction of the plurality of switching elements 33, then extends in the direction along the arrangement direction, and then again orthogonal to the arrangement direction. And then extend again in the direction along the arrangement direction to reach the connecting portion 84.
The second bus bar 63 for each pole extends from the switching element unit 30 in the direction along the arrangement direction and reaches the connection portion 84.
The third bus bar 64 for each pole extends from above the smoothing capacitor 36 in a direction perpendicular to the arrangement direction, and then extends in the direction along the arrangement direction to reach the connection portion 84.

  The first bus bar 62, the second bus bar 63, and the third bus bar 64 for each pole are connected to each pole terminal of the terminal block constituting the connection portion 84. Accordingly, the line-side connector 47, the smoothing capacitor 36, and the switching element unit 30 are electrically connected via the first bus bar 62, the second bus bar 63, and the third bus bar 64.

  As shown in FIG. 5, the base plate 32 constituting the switching element unit 30, the switching element 33, the control board 34, and the plurality of second bus bars 63 constituting the first wiring member 60 are integrally combined. That is, these are combined to form an integrated unit.

  Thus, in the present embodiment, the first wiring member 60 extending from the power storage device B is connected to the switching element unit 30 in the transaxle case 2.

6). Other Embodiments Finally, other embodiments of the inverter device 3 will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above-described embodiment, the example in which the fitting convex portion fitted to the service hole 82 is provided on the back surface of the hole cover 85 has been described. However, it is not limited to such an embodiment. The rear surface of the hole cover 85 may not have a fitting convex portion.
In this case, when one of the two bolts 88 is removed, the hole cover 85 is rotated around the bolt 88 that has not been removed, so that the service hole 82 can be exposed. It will become. In this case, it is preferable that the case-side connector 83 is arranged so that the line-side connector 47 has a positional relationship covering both heads of the two bolts 88.

  Further, for example, a recess having a shape corresponding to the outer shape of the hole cover 85 may be formed around the service hole 82, and the outer peripheral portion of the hole cover 85 may be fitted into the recess.

(2) In the above embodiment, the specific positional relationship is such that the line-side connector 47 and the screw shaft axis of the bolt 88 overlap with each other as seen along the screw screw shaft center of the bolt 88 constituting the fastening member. The example in which the distance in which the side connector 47 and the bolt 88 face each other along the screwing axis is less than the distance necessary for inserting the tool for releasing the fastening of the bolt 88 has been described. However, it is not limited to such an embodiment.
For example, the specific positional relationship is such that the line-side connector 47 and the bolt 88 overlap with each other when viewed along the screwing axis of the bolt 88 constituting the fastening member, and the line-side connector 47 and the bolt 88 are screwing axis. May be a positional relationship in which the distance along which the bolt 88 faces is less than the distance that the bolt 88 moves in the screw axis direction in order to release the fastening of the bolt 88.

  According to this configuration, in a state where the line side connector 47 is coupled to the case side connector 83, the bolt 88 necessary for releasing the fastening of the fastening member is provided between the opposing surfaces of the line side connector 47 and the fastening member. Since the moving distance in the direction of the screw axis is not secured, the bolt 88 cannot be removed from the case cover 81. Therefore, the hole cover 85 cannot be removed, and the operator cannot contact the connecting portion 84. In order to release the fastening of the fastening member, it is necessary to remove the line side connector 47 from the case side connector 83. In this case, since the power supply to the connection portion 84 is stopped, the operator contacts There is no risk of electric shock.

(3) In the above embodiment, the case cover 81 is provided with the female screw portion 87 at two locations across the service hole 82, and the two bolts 88 as an example of the male screw portion are formed on the hole cover 85. The example in which the hole cover 85 is fastened to the case cover 81 by being screwed into the female screw portion 87 via the two through holes has been described. However, it is not limited to such an embodiment. For example, the arrangement of the male screw portion and the female screw portion of the fastening member may be reversed.
For example, the bolts are erected at two places across the service hole 82, the hole cover 85 is inserted into the through hole, the bolt is placed on the case cover 81, and then the nut is screwed onto the bolt. The hole cover 85 may be fastened to the case cover 81.

  In this case, the specific positional relationship is such that the line side connector 47 and the nut screwing axis overlap with each other along the screw axis of the nut, and the line side connector 47 and the nut are connected to the screw axis. It is the positional relationship that the distance which opposes along a center is less than the distance required for insertion of the wrench or spanner as a tool for releasing the fastening of the nut.

  Alternatively, the specific positional relationship is such that the line-side connector 47 and the screw-threading axis of the nut overlap when viewed along the screw-shaft axis of the nut, and the line-side connector 47 and the nut are connected to the screw-shaft axis. The positional relationship may be such that the distance facing along the center is less than the distance that the nut moves in the direction of the screw axis in order to release the fastening of the nut to the bolt.

(4) In the above embodiment, an example in which the smoothing capacitor 36 and the switching element unit 30 are arranged side by side in a direction orthogonal to the arrangement direction of the plurality of switching elements 33 has been described. However, it is not limited to such an embodiment. For example, the smoothing capacitor 36 and the switching element unit 30 may be arranged side by side in a direction along the arrangement direction.

(5) In the above embodiment, the example in which the inverter device 3 is fixed to the first case portion 21 that houses the speed change mechanism TM and the like has been described. However, it is not limited to such an embodiment. For example, the inverter device 3 may be fixed to the second case portion 28 that houses the rotating electrical machine MG and the like. Further, the inverter device 3 may be fixed across the first case portion 21 and the second case portion 28. Alternatively, the inverter device 3 may be provided separately from the first case portion 21 and the second case portion 28. In this case, inverter device 3 and rotating electrical machine MG are electrically connected via a cable constituting AC power line 76.

(6) In the above embodiment, the example in which the inverter device 3 is accommodated in the inverter case 80 and the inverter case 80 is attached to the transaxle case 2 has been described. However, it is not limited to such an embodiment. The inverter device 3 may have an inverter caseless structure in which the inverter device 3 is directly fixed and integrated with the transaxle case 2 without using an inverter case that houses the inverter device 3. In such an inverter caseless structure, it is not necessary to prepare a dedicated inverter case, and it is not necessary to prepare a fixing seat for fixing the inverter case to the transaxle case 2. Therefore, cost reduction can be achieved by reducing the number of parts. In addition, the entire apparatus can be reduced in size. In this case, the transaxle case 2 also serves as an inverter case.

(7) In the above-described embodiment, the example in which the inverter device 3 is applied to a drive device for a hybrid vehicle of a 1-motor parallel system has been described. However, it is not limited to such an embodiment. For example, the inverter device 3 can be applied to a drive device for a two-motor hybrid vehicle including two rotating electric machines. The inverter device 3 can also be applied to a drive device for an electric vehicle that includes only the rotating electrical machine MG without including the internal combustion engine E as a driving force source for the wheels W.

  (8) In the above-described embodiment, the smoothing capacitor 36 includes one positive electrode and one negative electrode, the positive electrode third bus bar 64 is connected to the positive electrode, and the negative electrode third bus bar 64 is connected to the negative electrode. The terminals at the ends of the first bus bar 62, the second bus bar 63, and the third bus bar 64 for the positive electrode are fastened together by the fastening member to the positive terminal P of the terminal block as the connecting portion 84. Terminals at the ends of the first bus bar 62, the second bus bar 63, and the third bus bar 64 for negative electrode are fastened together with a fastening member to the negative terminal N of the base, and the positive electrode and the negative electrode of each of these bus bars are respectively An example of electrical connection has been described. However, it is not limited to such an embodiment.

  For example, the smoothing capacitor 36 includes two positive electrodes and two negative electrodes, a positive electrode third bus bar 64 is connected to one of the two positive electrodes, and one negative electrode of the two negative electrodes is connected to the negative electrode. The third bus bar 64 is connected to the positive terminal P of the terminal block as the connecting portion 84, and the first bus bar 62 for positive electrode and the terminal at the end of the third bus bar 64 are fastened together by a fastening member, Terminals at the ends of the first bus bar 62 and the third bus bar 64 for the negative electrode are fastened together with a fastening member to the negative terminal N of the terminal block, and the positive electrode and the negative electrode of each bus bar are electrically connected to each other. The second bus bar 63 for positive electrode is connected to the other positive electrode of the two positive electrodes of the smoothing capacitor 36, and the second bus bar 63 for negative electrode is connected to the other negative electrode of the two negative electrodes of the smoothing capacitor 36. It may be. In this case, the switching element unit 30 is electrically connected to the smoothing capacitor 36 and the case side connector 83.

(9) In the above-described embodiment, the example in which the discharge circuit 91 is configured as a series circuit of the discharge resistor 92 and the FET (field effect transistor) functioning as the discharge control switch 93 has been described. However, it is not limited to such an embodiment.
For example, instead of the discharge circuit 91 as described above, the switching element 33 and the coil of the rotating electrical machine MG may be configured to function as a discharge circuit.
In such a configuration, when the interlock mechanism 90 detects that the line-side connector 47 has been removed from the case-side connector 83, the switching element 33 is subjected to switching control, and the remaining charge accumulated in the smoothing capacitor 36. May be configured to flow through the coils of the respective phases of the rotating electrical machine MG.

(10) Regarding other configurations, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

7). Outline of the above embodiment Hereinafter, an outline of the inverter device 3 described above will be described.

  The inverter device (3) is an inverter device (3) that performs conversion between DC power and AC power of a DC power source, and is a switching element unit that performs switching for conversion between DC power and AC power. (30) and an inverter case (80) that accommodates the switching element unit (30). The case side connector (83) is fixed to the outer surface of the outer wall portion of the inverter case (80), and the case side connector ( 83) is connected to the line-side connector (47) provided at the end of the power supply line connected to the DC power supply, and is an opening that communicates the inside and outside of the inverter case (80) with the outer wall. A service hole (82) is formed, the service hole (82) is closed by a removable hole cover (85), and is electrically connected to the case side connector (83). The connection portion (84) between the first bus bar (62) connected electrically and the second bus bar (63) electrically connected to the switching element unit (30) is a service hole in the inverter case (80). (82), the hole cover (85) is fixed to the inverter case (80) by setting the fixing portion (86) in a fixed state, and the inverter is provided by releasing the fixing portion (86). The fixing to the case (80) is released, and the positional relationship between the line side connector (47) and the fixing portion (86) is fixed in the state where the line side connector (47) is connected to the case side connector (83). In the state where the line side connector (47) prevents the line side connector (47) from being released from the case side connector (83) and the line side connector (47) is removed from the case side connector (83). It so that the positional relationship is not impeded as the released state, the case-side connector (83) is arranged.

  According to such a configuration, in the state where the line side connector (47) is coupled to the case side connector (83), power is supplied to the connecting portion (84), but the hole cover (85) cannot be removed. Therefore, there is no possibility of electric shock because the operator cannot contact the connecting portion (84). In a state where the line side connector (47) is detached from the case side connector (83), the hole cover (85) can be removed. Therefore, the operator can contact the connecting portion (84), but there is no risk of electric shock because the connecting portion (84) is electrically disconnected from the DC power source.

  Thus, the positional relationship between the line side connector (47) and the fixing portion (86) is such that the fixing portion (86) is in the released state when the line side connector (47) is connected to the case side connector (83). The line-side connector (47) prevents this, and when the line-side connector (47) is detached from the case-side connector (83), the fixed portion (86) is not prevented from being released. As described above, the configuration in which the case-side connector (83) is arranged eliminates the need to provide an interlock mechanism in the inverter case (80), and realizes an inverter device (3) that is inexpensive and can keep the arrangement space small. it can.

  Here, the fixing portion (86) includes a fastening member including a male screw portion (88) and a female screw portion (87) that are screwed together to fasten the hole cover (85) and the outer wall portion, and includes a line-side connector. The positional relationship between (47) and the fixing portion (86) is such that the line side connector (47) and the fastening member overlap with each other when viewed along the screwing axis of the fastening member, and the line side connector (47). It is preferable that the distance that the fastening member and the fastening member face each other along the screw axis is less than the distance necessary for inserting a tool for releasing the fastening of the fastening member.

  According to this configuration, when the line side connector (47) is connected to the case side connector (83), the fastening of the fastening member is released between the opposing surfaces of the line side connector (47) and the fastening member. I can't insert a tool to do it. Therefore, since the hole cover (85) cannot be removed, the operator cannot contact the connecting portion (84). In order to release the fastening of the fastening member, the line side connector (47) needs to be removed from the case side connector (83). In this case, since the power supply to the connecting portion (84) is stopped, there is no possibility of electric shock even if the operator touches.

  The fixing portion (86) includes a fastening member including a male screw portion (88) and a female screw portion (87) that are screwed together to fasten the hole cover (85) and the outer wall portion, and includes a line side connector ( 47) and the fixing portion (86) are arranged such that the line side connector (47) and the fastening member overlap with each other when viewed along the screwing axis of the fastening member, and the line side connector (47) The distance that the fastening member faces along the screwing axis is the distance that the male screw part (88) or the female screw part (87) moves in the screwing axis direction in order to release the fastening of the fastening member. It is preferable that the positional relationship is less than.

  According to this configuration, in the state where the line side connector (47) is connected to the case side connector (83), the fastening of the fastening member is released between the opposing surfaces of the line side connector (47) and the fastening member. The hole cover (85) cannot be removed because the moving distance of the male screw portion (88) or the female screw portion (87) required in the above-mentioned direction is not ensured. Therefore, the operator cannot contact the connection part (86). In order to release the fastening of the fastening member, the line side connector (47) needs to be detached from the case side connector (83). In this case, since the power supply to the connecting portion (84) is stopped, there is no possibility of electric shock even if the operator touches.

  Further, the inverter case (80) accommodates a smoothing capacitor (36) electrically connected to both the case side connector (83) and the switching element unit (30), and the line side connector (47) and the case are accommodated. An interlock mechanism (90) is provided between the side connector (83). The interlock mechanism (90) operates a discharge circuit (91) for discharging the electric charge accumulated in the smoothing capacitor (36) when the line side connector (47) is detached from the case side connector (83). It is configured to let you.

  According to this configuration, in a state where the line side connector (47) is coupled to the case side connector (83), power is supplied to the connection portion (84), but the hole cover (85) cannot be removed, so that the operator Cannot contact the connection (84). When the line side connector (47) is detached from the case side connector (83), the interlock mechanism (90) operates the discharge circuit (91) for discharging the electric charge accumulated in the smoothing capacitor (36). . Since the hole cover (85) can be removed, the operator can contact the connecting portion (84), but power is not supplied to the connecting portion (84), and the electric charge stored in the capacitor is also discharged. There is no. Therefore, even when the smoothing capacitor (36) is accommodated in the inverter case (80), it is not necessary to provide an interlock mechanism in the inverter case (80), and the cost can be reduced and the arrangement space can be kept small. An inverter device (3) can be realized.

  The present invention can be used for an inverter device for a hybrid vehicle.

3: Inverter device 30: Switching element unit 36: Smoothing capacitor 47: Line side connector 61: DC power line (power supply line)
62: First bus bar 63: Second bus bar 80: Inverter case 81: Case cover (outer wall)
82: Service hole 83: Case side connector 84: Connection part 85: Hole cover 86: Fixing part 87: Female thread part (fastening member)
88: Bolt (male thread / fastening member)
90: Interlock mechanism 91: Discharge circuit B: Power storage device (DC power)

Claims (4)

An inverter device that performs conversion between DC power and AC power of a DC power source,
A switching element unit that performs switching for conversion between DC power and AC power, and an inverter case that houses the switching element unit,
A case side connector is fixed to the outer surface of the outer wall of the inverter case,
The case side connector is connected to a line side connector provided at an end of a power line connected to the DC power source,
In the outer wall portion, a service hole that is an opening that communicates the inside and outside of the inverter case is formed,
The service hole is closed by a removable hole cover,
A connection portion between a first bus bar electrically connected to the case side connector and a second bus bar electrically connected to the switching element unit is disposed inside the service hole in the inverter case,
The hole cover is fixed to the inverter case by setting the fixing portion to a fixed state, and the fixing to the inverter case is released by setting the fixing portion to a released state,
The positional relationship between the line side connector and the fixing portion is such that the line side connector prevents the fixing portion from being released when the line side connector is connected to the case side connector, and the line side connector An inverter device in which the case-side connector is arranged so that the fixed portion is not prevented from being released when the case is removed from the case-side connector. The fixing part includes a fastening member including a male screw part and a female screw part that are screwed together to fasten the hole cover and the outer wall part,
The positional relationship between the line side connector and the fixing portion is such that the line side connector and the fastening member overlap with each other when viewed along the screwing axis of the fastening member, and the line side connector and the fastening member 2. The inverter device according to claim 1, wherein a distance in which the two are opposed to each other along the screw axis is less than a distance necessary for inserting a tool for releasing the fastening of the fastening member. The fixing part includes a fastening member including a male screw part and a female screw part that are screwed together to fasten the hole cover and the outer wall part,
The positional relationship between the line side connector and the fixing portion is such that the line side connector and the fastening member overlap with each other when viewed along the screwing axis of the fastening member, and the line side connector and the fastening member Is a positional relationship in which a distance that faces along the screw axis is less than a distance that the male screw part or the female screw part moves in the screw axis direction to release the fastening of the fastening member. The inverter device according to Item 1. The inverter case contains a smoothing capacitor that is electrically connected to both the case side connector and the switching element unit,
An interlock mechanism is provided between the line side connector and the case side connector,
The said interlock mechanism operates the discharge circuit for discharging the electric charge accumulate | stored in the said smoothing capacitor, when the said line side connector is removed from the said case side connector. The inverter device described in 1.

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