ELECTRICAL UNIT

Abstract

An electrical unit may comprise a housing with a maintenance hole and a terminal block enclosed within the housing. The housing may have a rib extending over an opening of the maintenance hole. The terminal block may have a first electrical connection structure and a second electrical connection structure of a different type than the first. At least one section of the first electrical connection structure may be arranged so that it is exposed to the outside through the opening of the maintenance hole. At least one section of the second electrical connection structure is arranged behind the rib.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority over Japanese patent application No. 2024-163994, which was filed on September 20, 2024. The entire contents of the priority application are incorporated herein by reference. TECHNICAL AREA

[0002] The present disclosure relates to an electrical unit. BACKGROUND

[0003] Electrical units comprise a housing that contains electrical components. Electrical units with a housing that contains both mechanical and electrical components are specifically referred to as electromechanical units, and such units have been developed. Japanese patent no. 7248145 describes an example of an electrical unit of this type.

[0004] A terminal block is arranged within a housing to secure electrical connections to components housed within the housing. The terminal block is positioned so that it is exposed to the outside through a maintenance hole formed in the housing. This allows the user to access the terminal block through the maintenance hole after the components have been installed in the housing. The user can thus perform electrical connection work on the terminal block through the maintenance hole. SUMMARY

[0005] Several types of electrical connection structures can be incorporated into a terminal block, corresponding to various types of components housed within a casing. These electrical connection structures include, among others, a connection structure that fastens printed circuit boards together with a fastener and a connection structure that connects cable harnesses with a relay connector. Incorporating such diverse types of electrical connection structures into a terminal block can increase its size. To avoid increasing the size of the casing, there is a need for a technology to accommodate a terminal block within a limited space. The present disclosure provides a technology that prevents the enlargement of a casing housing a terminal block.

[0006] An electrical unit disclosed herein may have a housing containing a maintenance hole and a terminal block accommodated within the housing. The housing may have a rib extending over an opening of the maintenance hole. The terminal block may have a first electrical connection structure and a second electrical connection structure of a different type than the first electrical connection structure. At least one section of the first electrical connection structure may be arranged such that it is exposed to the outside through the opening of the maintenance hole. At least one section of the second electrical connection structure may be arranged behind the rib. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a cross-sectional view of an electromechanical unit 10. Fig. Figure 2 is a diagram showing a terminal block 40 visible through an opening of a maintenance hole 14f. Fig. 3 is a cross-sectional view corresponding to line III-III in Fig. 1 corresponds to. Fig. 4 is a cross-sectional view, corresponding to a line IV-IV in Fig. 1 corresponds to. DETAILED DESCRIPTION

[0007] In one aspect of the present teaching, an electrical unit may have a housing containing a maintenance hole and a terminal block incorporated into the housing. The housing may have a rib extending over an opening of the maintenance hole. The terminal block may have a first electrical connection structure and a second electrical connection structure of a different type than the first electrical connection structure. At least one section of the first electrical connection structure may be arranged such that it is exposed to the outside through the opening of the maintenance hole. At least one section of the second electrical connection structure may be arranged behind the rib.The first electrical connection structure might, for example, be one where electrical connection work must be performed through the access hole after the components have been installed in the housing. The second electrical connection structure might, for example, be one where no electrical connection work is required through the access hole after the components have been installed in the housing.

[0008] The housing of the aforementioned electrical unit features a rib extending over the access hole to prevent a reduction in housing rigidity. The presence of this rib at the access hole can make it difficult for a user to access the space behind it. However, in the electrical unit described above, the electrical connection structure is located behind the rib, which does not impede electrical connection work. This allows for effective use of the space behind the rib at the access hole, thus avoiding an increase in housing size.

[0009] The opening of the maintenance hole can extend along one direction when viewed in a direction perpendicular to one of the opening faces. The rib can extend across the opening in a direction perpendicular to that one direction.

[0010] At least the section of the second electrical connection structure can be arranged to overlap the rib when viewed in a direction perpendicular to an opening surface of the maintenance hole opening.

[0011] The housing may further comprise a partition wall arranged between a first chamber and a second chamber. The terminal block may extend through the partition wall and be located in both the first and the second chamber.

[0012] The first electrical connection structure can establish an electrical connection between a component located in the first chamber and a component located in the second chamber. The second electrical connection structure can also establish an electrical connection between a component located in the first chamber and a component located in the second chamber. A voltage supplied via the second electrical connection structure can be lower than a voltage supplied via the first electrical connection structure.

[0013] The first electrical connection structure can establish an electrical connection between printed circuit boards (PCBs) by securing the PCBs with a fastener. The second electrical connection structure can establish an electrical connection between cable harnesses by connecting the cable harnesses with a relay connector.

[0014] The electrical unit may further comprise a housing-mounted motor, a housing-mounted sensor configured to detect the motor's state, a housing-mounted power control circuit, and a control board configured to control the power control circuit. The motor and the power control circuit may be electrically connected to each other via the first electrical connection structure. The sensor and the control board may be electrically connected to each other via the second electrical connection structure.

[0015] The second electrical connection structure can include a relay connector. The sensor can be electrically connected to the relay connector via a first wiring harness. The control board can be electrically connected to the relay connector via a second wiring harness.

[0016] The electrical unit may further include a power control terminal, which is enclosed in the housing and electrically connected to the power control circuit. The power control terminal may be attached to the first electrical connection structure by means of a fastener. A fixed section between the power control terminal and the first electrical connection structure may be arranged so that it is exposed to the outside through the access hole.

[0017] The housing may further comprise a partition wall arranged between a first chamber and a second chamber. The terminal block may extend through the partition wall and be located in both the first and the second chamber.

[0018] The motor and sensor can be housed in the first chamber of the casing. The power control circuitry can be housed in the second chamber of the casing.

[0019] The first electrical connection structure can be electrically connected to the power control circuit in the second chamber.

[0020] The electrical unit may further include a power control terminal, which is housed within the casing and electrically connected to the power control circuit. The first electrical connection structure may include a printed circuit board (PCB) extending into both the first and second chambers and electrically connected to the motor. The power control terminal may be attached to the PCB of the first electrical connection structure by means of a fastener. A section between the power control terminal and the PCB of the first electrical connection structure may be positioned so that it is exposed to the outside through the access hole.

[0021] The second electrical connection structure can be electrically connected to the sensor in the first chamber and electrically connected to the control board in the second chamber.

[0022] Representative, non-limiting examples of the present disclosure are now described in more detail with reference to the accompanying drawings. This detailed description is intended solely to provide the person skilled in the art with further details regarding the implementation of preferred aspects of the present teaching and is not intended to limit the scope of the disclosure. Furthermore, each of the additional features and teachings disclosed below can be used separately or in combination with other features and teachings to provide improved electrical units and methods for their use and manufacture.

[0023] Furthermore, combinations of features and steps disclosed in the following detailed description may not be necessary to practice the disclosure in the broadest sense and are instead taught only to describe representative examples of the disclosure. Moreover, various features of the representative examples described above and below, as well as of the various independent and dependent claims, may be combined in a manner not specifically and expressly enumerated to provide additional useful embodiments of the teaching presented here.

[0024] All features disclosed in the description and / or the claims shall be disclosed separately and independently of one another for the purposes of the original written disclosure and for the purpose of limiting the claimed subject matter, irrespective of the combinations of features in the exemplary embodiments and / or the claims. Furthermore, all ranges of values ​​or information relating to groups of units shall disclose every possible intermediate value or unit for the purposes of the original written disclosure and for the purpose of limiting the claimed subject matter.

[0025] With reference to the Fig. Sections 1 to 4 describe an electromechanical unit 10, which is an example of an electrical unit. The electromechanical unit 10 may, for example, be installed in the front compartment of an electric vehicle, although this is not always the case. The electric vehicle described here may be a hybrid vehicle powered by an internal combustion engine and a motor, an electric vehicle powered by a motor, or a fuel-powered vehicle.

[0026] In the drawings, the directions of the electromechanical unit 10 are defined as directions when the electromechanical unit 10 is mounted in the electric vehicle, i.e., based on the directions of the electric vehicle. A direction FR indicates the front direction of the FRONT / REAR direction of the electric vehicle, and a direction RR indicates the rear direction of the FRONT / REAR direction of the electric vehicle. A direction LH indicates the left direction of the RIGHT / LEFT direction of the electric vehicle, and a direction RH indicates the right direction of the RIGHT / LEFT direction of the electric vehicle. A direction UP indicates the UP / DOWN direction of the electric vehicle, and a direction DW indicates the DOWN direction of the UP / DOWN direction of the electric vehicle.

[0027] As in Fig. As shown in Figure 1, the electromechanical unit 10 comprises a housing 12, a power control circuit 20, a control board 30, a terminal block 40, a plurality of motors 50, 52, a gear mechanism 54 and a plurality of sensors 60, 62.

[0028] The enclosure 12 is a cabinet element and comprises a housing body 14 and a cover plate 16. The housing body 14 has a base plate 14a and a perimeter wall 14b that extends upwards from the perimeter edge of the base plate 14a. An opening 14c is arranged in an upper section of the housing body 14, which is bounded by the upper end of the perimeter wall 14b. The opening 14c of the housing body 14 is closed by the cover plate 16. The cover plate 16 is detachably attached to the opening 14c of the housing body 14. The power control circuit 20 is attached to the underside of the cover plate 16, and the control board 30 is attached to the top of the cover plate 16. The control board 30 is covered by a protective cover 18, which is arranged on the cover plate 16. A power connection 17 is arranged on a section of the cover plate 16 that is not covered by the protective cover 18.The power connector 17 is configured so that a power connector 6 of a power cable 4 can be connected to it. In this way, direct current from a power source installed in the electric vehicle can be supplied to the power control circuit 20. The housing body 14, the cover plate 16, and the protective cover 18 can be made of a material such as aluminum, but this is not always the case.

[0029] The housing 12 further comprises a partition wall 14d that divides the interior of the housing 12 in the UP / DOWN direction. A section of the interior of the housing 12 located below the partition wall 14d is defined as a first chamber R1, and a section of the interior of the housing 12 located above the partition wall 14d is defined as a second chamber R2.

[0030] The multiple motors 50, 52, the gear mechanism 54, and the multiple sensors 60, 62 are arranged in the first chamber R1 of the housing 12. The multiple motors 50, 52 are traction motors configured to drive the wheels of the electric vehicle. The multiple motors 50, 52 comprise a first motor 50 and a second motor 52. The gear mechanism 54 includes, for example, a planetary gear mechanism, a reduction gear mechanism, and a differential gear mechanism. The power from the motors 50 and 52 is transmitted to the wheels of the electric vehicle via the gear mechanism 54.

[0031] The first motor 50 is a three-phase AC motor and has three motor terminals m1 to m3, corresponding to the phases U, V, and W. The second motor 52 is also a three-phase AC motor and has three motor terminals m4 to m6, corresponding to the phases U, V, and W. These motor terminals m1 to m6 are elongated circuit boards and may be made of conductive material(s) such as metal(s), although this is not always the case. The multiple motor terminals m1 to m6 are housed in the first chamber R1 of the casing 12. The motor terminals m1 to m6 extend upwards and are separated from each other along the front / back direction of the electric vehicle. The distance between motor terminal m3 and motor terminal m4 is greater than the distances between the other motor terminals.

[0032] The array of sensors 60, 62 comprises a first sensor 60 and a second sensor 62. The first sensor 60 is attached to the first motor 50 and configured to detect the state of the first motor 50. The first sensor 60 could, for example, be a rotary angle sensor configured to detect the rotation angle of the first motor 50, or a temperature sensor configured to detect the temperature of the first motor 50, although this is not always the case. As described later, a wiring harness 64 connected to the first sensor 60 is connected to a relay connector 44 of the terminal block 40. The second sensor 62 is attached to the second motor 52 and configured to detect the state of the second motor 52.The second sensor 62 can, for example, be a rotary angle sensor configured to detect the rotation angle of the second motor 52, or a temperature sensor configured to detect the temperature of the second motor 52, although this is not always the case. As described later, a wiring harness 66 connected to the second sensor 62 is connected to the relay connector 44 of the terminal block 40.

[0033] The power control circuit 20 is located in the second chamber R2 of the housing 12. The power control circuit 20 comprises a boost converter and an inverter and is configured to amplify the direct current supplied by the power source and convert it into alternating current. Adjacent to the power control circuit 20 is a power control terminal block 22. The power control terminal block 22 has power control terminals y1 to y6 for outputting the alternating current power generated by the power control circuit 20. These power control terminals y1 to y6 are elongated printed circuit boards and may be made of conductive material(s), such as metal(s), although this is not always the case. Three power control terminals y1 to y3, corresponding to the phases U, V, and W, are power control terminals for outputting the alternating current power to the first motor 50.Three power control terminals y4 to y6, corresponding to phases U, V, and W, are power control terminals for the output of AC power to the second motor 52. The multiple power control terminals y1 to y6 are located in the second chamber R2 of the housing 12. Power control terminals y1 to y6 extend downwards and are separated from each other along the front / back direction of the electric vehicle. The distance between power control terminal y3 and power control terminal y4 is greater than the distances between the other power control terminals.

[0034] The control board 30, located on the top of the cover plate 16, includes a microcomputer comprising, for example, a CPU, RAM, ROM, an input / output interface, etc. The control board 30 controls the operation of the power control circuit 20 by processing signals according to the program(s) stored in the ROM within a working area of ​​the RAM. The control board 30 controls the operation of the power control circuit 20 based on sensing signals from various sensors, including the multiple sensors 60, 62.

[0035] A through-hole 14e is formed in the partition wall 14d of the housing 12, and the through-hole 14e connects the first chamber R1 with the second chamber R2. The terminal block 40 is positioned so that it closes the through-hole 14e of the partition wall 14d and is located in both the first chamber R1 and the second chamber R2.

[0036] The terminal block 40 comprises a terminal block body 42, a plurality of relay busbars b1 to b6, and a relay plug 44. The body of the terminal block 42 is essentially box-shaped and may be made of an insulating material, such as a resin, although this is not always the case. The relay busbars b1 to b6 are elongated, conductive plates attached to the housing of the terminal block 42 and may be made of one or more conductive materials, such as metal(s), although this is not always the case. Each of the relay busbars b1 to b6 can be integrally formed with one of the corresponding motor terminals m1 to m6. That is, each of the relay busbars b1 to b6 can form an end section of the corresponding motor terminal. For example, relay busbar b1 can form an end section of motor terminal m1.Relay busbars b1 to b6 extend in the UP / DOWN direction of the electric vehicle and are separated from each other along the FRONT / REAR direction of the electric vehicle. The distance between relay busbar b3 and relay busbar b4 is greater than the distances between the other relay busbars, and relay connector 44 is located between relay busbar b3 and relay busbar b4.

[0037] As in Fig. 1 and Fig. As shown in Figure 3, each of the relay busbars b1 to b6 extends into both the first chamber R1 and the second chamber R2. That is, one end of each of the relay busbars b1 to b6 is located in the first chamber R1, and the opposite end of each of the relay busbars b1 to b6 is located in the second chamber R2. Each of the relay busbars b1 to b6 is secured in the first chamber R1 to one of the corresponding motor terminals m1 to m6 by a fastening element 82 (e.g., a screw and a nut). In this way, the relay busbars b1 to b6 are electrically connected to the corresponding motor terminals. Each of the relay busbars b1 to b6 is secured in the second chamber R2 to one of the corresponding power control terminals y1 to y6 by a fastening element 84 (e.g., a screw and a nut).In this way, the relay busbars b1 to b6 are electrically connected to the corresponding power control terminals. In this embodiment, among the electrical connection structures of the terminal block 40, one electrical connection structure that electrically connects the motor terminals m1 to m6, the relay busbars b1 to b6, and the power control terminals y1 to y6 is referred to as the "first electrical connection structure 72". This means that the first electrical connection structure 72 establishes an electrical connection between the printed circuit boards by securing the boards with the mounting elements. Thus, the first electrical connection structure 72 can supply the high voltage required to drive the first motor 50 and the second motor 52 from the power control circuit 20.

[0038] As in Fig. 1 and Fig. As shown in Figure 4, the relay plug 44 is formed integrally with the terminal block body 42 of the terminal block 40. The relay plug 44 extends into both the first chamber R1 and the second chamber R2 and has a plurality of first terminals 46 arranged in the first chamber R1, as well as a second terminal 48 arranged in the second chamber R2. Fig. For simplicity, only one of the multiple connections 46 is shown. Both the multiple of first connections 46 and the second connection 48 can be located in either the first chamber R1 or the second chamber R2. A connection at one end of a cable harness 64, which is connected to the first sensor 60, and a connection at one end of a cable harness 66, which is connected to the second sensor 62, are connected to the multiple of first sockets 46 of the relay connector 44. A connector at one end of the cable harness 32 is connected to the second connection 48 of the relay connector 44. The cable harness 32 extends into the first chamber R1 and is connected to the control board 30.Thus, the relay connector 44 routes the cable harnesses 64, 66, extending from the plurality of sensors 60, 62, to the cable harness 32, extending from the control board 30, in order to transmit detection signals acquired by the plurality of sensors 60, 62 to the control board 30. In this embodiment, one of the electrical connection structures of the terminal block 40, which electrically connects the cable harnesses 64, 66 extending from the plurality of sensors 60, 62, the relay connector 44, and the cable harness 32 extending from the control board 30, is referred to as the "second electrical connection structure 74". This means that the second electrical connection structure 74 establishes a connection between the cable harnesses via the relay connector.Thus, the voltage supplied via the second electrical connection structure 74 is lower than the voltage supplied via the first electrical connection structure 72.

[0039] As in Fig. As shown in Figure 2, the housing 12 has a maintenance hole 14f in the second chamber R2, and the maintenance hole 14f is elongated in the FRONT / REAR direction of the electric vehicle. That is, the opening of the maintenance hole 14f has a substantially rectangular shape. The housing 12 further has a rib 14g that extends over the maintenance hole 14f in the UPPER / DOWN direction of the electric vehicle. That is, the rib 14g extends in the UPPER / DOWN direction of the electric vehicle to connect the pair of longitudinal sides that define the opening of the maintenance hole 14f. The presence of the rib 14g at the maintenance hole 14f suppresses a reduction in the stiffness of the housing 12 that could be caused by the formation of the maintenance hole 14f. The geometry of the rib 14g, including the width of the rib 14g in the FRONT / REAR direction of the electric vehicle and the thickness of the rib 14g in the RIGHT / LEFT direction of the electric vehicle, can be varied.The maintenance hole 14f is covered by a maintenance hole cover 19, which covers the entire opening of the maintenance hole 14f (see . Fig. 3 and Fig. 4) The maintenance hole cover 19 is detachable from the maintenance hole 14f or is attached in such a way that the maintenance hole cover 19 can open and close the opening of the maintenance hole 14f.

[0040] As in Fig. As shown in Figure 2, a section of the first electrical connection structure 72 (i.e., sections in which the power control terminals y1 to y6 are attached to the relay busbars b1 to b6 by the fasteners 84) is positioned such that it is exposed to the outside through the opening of the maintenance hole 14f. In other words, viewed in a direction perpendicular to the opening surface of the maintenance hole 14f, the sections in which the power control terminals y1 to y6 are attached to the relay busbars b1 to b6 by the fasteners 84 do not overlap the rib 14g.Thus, after assembling various components in the housing 12, the user can access the first electrical connection structure 72 of the terminal block 40 through the opening of the maintenance hole 14f in order to carry out the work of attaching the multitude of power control terminals y1 to y6 to the multitude of relay busbars b1 to b6 with the fastening elements 84.

[0041] As in Fig.As shown in Figure 2, a section of the second electrical connection structure 74 (i.e., the relay connector 44) is located behind the rib 14g, which extends over the maintenance hole 14f. In other words, viewed in the direction perpendicular to the opening surface of the maintenance hole 14f, the relay connector 44 is positioned so that it overlaps the rib 14g. The presence of the rib 14g at the maintenance hole 14f can make it difficult for the user to access the space behind the rib 14g through the opening of the maintenance hole 14f. However, the cable harnesses 64, 66 originating from the sensors 60, 62, and the cable harness 32 originating from the control board 30 are flexible and sufficiently long. Thus, the cable harnesses 32, 64, 66 can be connected to the relay connector 44 before various components are installed in the housing 12. This means that the connection of the cable harnesses 32, 64, 66 to the relay plug 44 does not have to be made through the opening of the maintenance hole 14f.

[0042] In the electromechanical unit 10 described above, the relay connector 44, for which no electrical connection work needs to be carried out through the opening of the maintenance hole 14f, is arranged behind the rib 14g. This allows for effective use of the space behind the rib 14g located at the maintenance hole 14f, thus avoiding an increase in the size of the housing 12.

[0043] While specific examples of the present disclosure have been described in detail above, these examples are merely illustrative and do not limit the scope of the claims. The technology described in the claims also includes various changes and modifications to the specific examples described above. The technical elements explained in the present description or drawings offer technical benefits either independently of one another or through various combinations. The present disclosure is not limited to the combinations described at the time the claims were filed. Furthermore, the purpose of the examples shown in the present description or drawings is to fulfill several objectives simultaneously, and the fulfillment of each of these objectives confers technical benefits on the present disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2024-163994

[0001] JP 7248145

[0003]

Claims

[1] Electrical unit (10) comprising the following: a housing (12) having a maintenance hole (14f); and a terminal block (40) which is included in the housing (12), where the housing (12) includes a rib (14g) that extends over an opening of the maintenance hole (14f), The terminal block (40) comprises the following: a first electrical interconnection structure (72); and a second electrical connection structure (74) of a different type from the first electrical connection structure (72), at least one section of the first electrical connection structure (72) is arranged to be exposed to an outside through the opening of the maintenance hole (14f), and at least one section of the second electrical connection structure (74) is located behind the rib (14g). [2] Electrical unit (10) according to claim 1, wherein the opening of the maintenance hole (14f) extends along a direction when viewed in a direction perpendicular to an opening surface of the opening of the maintenance hole (14f) and the rib (14g) extends across the opening along a direction that is perpendicular to that one direction. [3] Electrical unit (10) according to claim 1, wherein at least the section of the second electrical connection structure (74) is arranged to overlap the rib (14g) when viewed in a direction perpendicular to an opening surface of the opening of the maintenance hole (14f). [4] Electrical unit (10) according to claim 1, wherein the housing (12) further comprises a partition wall (14d) arranged between a first chamber (R1) and a second chamber (R2), and the terminal block (40) extends through the partition wall (14d) and is located in both the first chamber (R1) and the second chamber (R2). [5] Electrical unit (10) according to claim 4, wherein the first electrical connection structure (72) electrically connects a component located in the first chamber (R1) and a component located in the second chamber (R2), the second electrical connection structure (74) electrically connects a component located in the first chamber (R1) and a component located in the second chamber (R2), and a voltage supplied by the second electrical connection structure (74) is lower than a voltage supplied by the first electrical connection structure (74). [6] Electrical unit (10) according to claim 5, wherein the first electrical connection structure (72) between printed circuit boards (m1 to m6, y1 to y6 and b1 to b6) electrically connects the printed circuit boards (m1 to m6, y1 to y6 and b1 to b6) by fastening them with a fastening element (82, 84), and the second electrical connection structure (74) electrically connects cable harnesses (64, 66 and 32) by connecting the cable harnesses (64, 66 and 32) with a relay plug (44). [7] Electrical unit (10) according to claim 1, further comprising: a motor (50 and 52) which is housed in the casing (12); a sensor (60 and 62) which is included in the housing (12) and is configured to detect a state of the motor (50 and 52); a power control circuit (20) which is included in the housing (12); and a control board (30) configured to control the power control circuit (20), wherein the motor (50 and 52) and the power control circuit (20) are electrically connected to each other via the first electrical connection structure (72) and the sensor (60 and 62) and the control board (30) are electrically connected to each other via the second electrical connection structure (74). [8] Electrical unit (10) according to claim 7, wherein the second electrical connection structure (74) includes a relay connector (44), the sensor (60 and 62) is electrically connected to the relay plug (44) via a first wiring harness (64 and 66) and the control board (30) is electrically connected to the relay connector (44) via a second cable harness (32). [9] Electrical unit (10) according to claim 7, further comprising: a power control terminal (y1 to y6) which is housed in the enclosure (12) and is electrically connected to the power control circuit (20), wherein the power control terminal (y1 to y6) is attached to the first electrical connection structure (72) by means of a fastening element (84) and a fastening section is arranged between the power control terminal (y1 to y6) and the first electrical connection structure (72) to be exposed to the outside through the opening of the maintenance hole (14f). [10] Electrical unit (10) according to claim 7, wherein the housing (12) further comprises a partition wall (14d) arranged between a first chamber (R1) and a second chamber (R2), and the terminal block (40) extends through the partition wall (14d) and is located in both the first chamber (R1) and the second chamber (R2). [11] Electrical unit (10) according to claim 10, wherein the motor (50 and 52) and the sensor (60 and 62) are included in the first chamber (R1) of the housing (12) and the power control circuit (20) is located in the second chamber (R2) of the housing (12). [12] electrical unit (10) according to claim 11, wherein the first electrical connection structure (72) in the second chamber (R2) is electrically connected to the power control circuit (20). [13] Electrical unit (10) according to claim 12, further comprising: a power control terminal (y1 to y6) which is housed in the enclosure (12) and is electrically connected to the power control circuit (20), wherein the first electrical connection structure (72) comprises a printed circuit board (m1 to m6 and b1 to b6) which extends into both the first chamber (R1) and the second chamber (R2) and is electrically connected to the motor (50 and 52), the power control terminal (y1 to y6) is attached to the circuit board (m1 to m6 and b1 to b6) of the first electrical connection structure (72) by means of a fastening element (84) and a fastening section is arranged between the power control terminal (y1 to y6) and the printed circuit board (m1 to m6 and b1 to b6) of the first electrical connection structure (72) to be exposed to the outside through the opening of the maintenance hole (14f). [14] Electrical unit (10) according to claim 11, wherein the second electrical connection structure (74) is electrically connected to the sensor (60 and 62) in the first chamber (R1) and is electrically connected to the control board (30) in the second chamber (R2).

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