Motor drive device for vehicle

Abstract

The invention relates to a motor driving device for a vehicle. The vehicle motor drive device (100) is provided with: a motor (1); an inverter (2) that supplies power to the motor (1); a motor-side wiring (3) for connecting the motor (1) and the inverter (2); a housing (5) including a motor chamber (51) and having formed therein a through hole (54) through which a motor-side wiring (3) extending from the motor (1) housed in the motor chamber (51) passes; and an elastically deformable cylindrical elastic member (6) that includes a wiring insertion hole (63) into which a motor-side wiring (3) extending from the motor (1) is inserted, and that is attached to the through hole (54) so as to seal the space between the through hole (54) and the motor-side wiring (3).

Description

Technical Field

[0001] The present invention relates to a vehicle motor drive device, and more particularly to a vehicle motor drive device including a motor. Background Art

[0002] Conventionally, a vehicle motor drive device including a motor is known. For example, Japanese Patent Application Laid-Open No. 2021-136770 discloses the vehicle motor drive device.

[0003] In the above-mentioned Japanese Patent Gazette No. 2021-136770, a motor device (vehicle motor drive device) having a motor is disclosed. The motor device has an inverter, an insulating junction box and a motor housing. The inverter is configured to convert DC power into AC power and supply AC power to the motor. In order to supply AC power from the inverter to the motor, the insulating junction box electrically connects the power cable connected to the inverter and the motor bus connected to the motor. The motor housing includes a motor chamber that accommodates the motor and stores oil for cooling the motor. In order to ensure the oil tightness and insulation of the motor chamber, the motor housing includes a junction box chamber that accommodates the insulating junction box and a partition wall that separates the junction box chamber from the motor chamber.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2021-136770

[0005] However, in the motor device of the above-mentioned Japanese Patent Publication No. 2021-136770, in order to ensure the oil tightness and insulation of the motor chamber, an insulating junction box housed in a junction box chamber separated by a partition wall is used to electrically connect the motor and the inverter. Therefore, in the motor device of the above-mentioned Japanese Patent Publication No. 2021-136770, there is a problem that the structure of the motor device (device) is complicated due to the provision of the junction box chamber and the insulating junction box. Summary of the invention

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a vehicle motor drive device that can ensure the oil tightness and insulation of a motor chamber and simplify the structure of the device.

[0007] In order to achieve the above-mentioned purpose, one aspect of the present invention provides a vehicle motor drive device comprising: a motor, which is used in a vehicle; an inverter, which supplies electric power to the motor; motor-side wiring, one end of which is connected to the motor and is used to connect the motor and the inverter; a housing, which includes a motor chamber that accommodates the motor and stores a coolant for cooling the accommodated motor, and is formed with a through hole for the motor-side wiring extending from the motor accommodated in the motor chamber to pass through; and an elastically deformable cylindrical elastic component, which includes a wiring insertion hole for inserting the motor-side wiring extending from the motor, and is installed in the through hole in a manner that seals the through hole and the motor-side wiring.

[0008] In a motor drive device for a vehicle according to one aspect of the present invention, as described above, an elastically deformable cylindrical elastic member is provided, the elastically deformable cylindrical elastic member includes a wiring insertion hole for inserting a motor-side wiring extending from a motor housed in a motor chamber, and is attached to the through hole in a manner that seals the through hole and the motor-side wiring. Thus, it is not necessary to provide a junction box chamber and an insulating junction box in the housing, and the oil tightness and insulation of the motor chamber can be ensured by the cylindrical elastic member attached to the through hole of the housing, so that the oil tightness and insulation of the motor chamber can be ensured, and the structure of the device can be simplified.

[0009] In the vehicle motor drive device of the above-mentioned one aspect, preferably, the housing further includes: an inverter chamber that accommodates the inverter inside; and a partition wall that separates the motor chamber from the inverter chamber and has a through hole formed therein, and the cylindrical elastic member is mounted on the through hole formed in the partition wall.

[0010] According to such a structure, it is not necessary to set up a junction box chamber and an insulating junction box separately from the housing, the inverter chamber and the motor chamber. By installing a cylindrical elastic component in the through hole formed in the partition wall, the oil tightness and insulation of the motor chamber can be ensured. Therefore, in the vehicle motor drive device in which the motor and inverter are unitized, the structure of the device can be simplified.

[0011] In this case, preferably, an inverter-side wiring is further provided, one end of which is connected to the inverter and arranged in the inverter chamber, and the other end of the motor-side wiring is connected to the other end of the inverter-side wiring in the inverter chamber.

[0012] According to such a structure, since the other end of the motor-side wiring and the other end of the inverter-side wiring are connected in the inverter chamber where no cooling liquid is stored, the cooling liquid can be prevented from adhering to the connection portion between the other end of the motor-side wiring and the other end of the inverter-side wiring. As a result, the reduction in conductivity caused by the adhesion of the cooling liquid can be suppressed.

[0013] In the vehicle motor drive device of the above aspect, preferably, the cylindrical elastic member includes a circumferential inner protrusion that protrudes from an inner peripheral surface of the wiring insertion hole having a diameter smaller than a diameter of the motor-side wiring.

[0014] According to such a structure, the inner protrusion contacts the motor-side wiring, thereby preventing the entire inner peripheral surface of the wiring insertion hole from contacting the entire outer peripheral surface of the motor-side wiring, thereby reducing the sliding resistance between the inner peripheral surface of the wiring insertion hole and the motor-side wiring when the motor-side wiring is inserted into the wiring insertion hole. As a result, the sealing between the wiring insertion hole and the motor-side wiring can be ensured, and the motor-side wiring can be easily inserted into the wiring insertion hole.

[0015] In the vehicle motor drive device according to the above aspect, preferably, the cylindrical elastic member includes a circumferential outer protrusion that protrudes from a portion of the outer peripheral surface facing the inner peripheral surface of the through hole of the housing.

[0016] According to such a configuration, the outer protrusion can be elastically deformed between the outer peripheral surface of the cylindrical elastic member and the inner peripheral surface of the through hole of the housing, thereby improving the sealing performance between the inner peripheral surface of the through hole of the housing and the outer peripheral surface of the cylindrical elastic member.

[0017] In the vehicle motor drive device of the above-mentioned one aspect, preferably, a plurality of motor-side wirings are provided to connect the motor and the inverter, a plurality of cylindrical elastic components are provided corresponding to each of the plurality of motor-side wirings, and a plurality of through holes are formed in the shell corresponding to each of the plurality of cylindrical elastic components into which the plurality of motor-side wirings are respectively inserted.

[0018] Here, in the case of a cylindrical elastic member having a plurality of wiring insertion holes corresponding to each of a plurality of motor-side wirings, when the plurality of motor-side wirings moves due to the vibration of the vehicle, as the wiring on one side of the adjacent motor-side wiring moves, the elastic member near the wiring insertion hole into which the wiring on one side is inserted is pulled, and sometimes a gap is generated between the wiring insertion hole into which the wiring on the other side is inserted and the wiring on the other side. In this case, a disadvantage occurs in that the coolant leaks out of the motor chamber from the gap generated between the wiring insertion hole into which the wiring on the other side is inserted and the wiring on the other side (sealing performance is reduced). Therefore, by forming a plurality of through holes in the housing corresponding to each of the plurality of cylindrical elastic members into which each of the plurality of motor-side wirings is respectively inserted, the generation of a gap between the motor-side wiring and the wiring insertion hole caused by the vibration of the vehicle can be suppressed, and thus the reduction in sealing performance between the wiring insertion hole and the motor-side wiring can be suppressed.

[0019] Furthermore, in the vehicle motor drive device according to the above-described aspect, the following configuration is also conceivable.

[0020] (Additional Notes 1)

[0021] In the vehicle motor drive device according to the above aspect, the cylindrical elastic member includes a circumferential end-side protrusion that protrudes from the end opposite to the motor chamber side and engages with the edge of the through hole opposite to the motor chamber side.

[0022] According to such a configuration, it is possible to prevent the cylindrical elastic member from falling out of the through hole.

[0023] (Additional Note 2)

[0024] In the vehicle motor drive device according to the above aspect, the cylindrical elastic member has heat resistance and oil resistance.

[0025] According to such a configuration, even when the vehicle motor drive device is provided at a portion of the vehicle that is susceptible to relatively high temperature, degradation of the cylindrical elastic member can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram showing a motor drive device for a vehicle according to an embodiment.

[0027] Figure 2 It is a cross-sectional view showing a cylindrical elastic member of a motor drive device for a vehicle according to an embodiment.

[0028] Figure 3 This is a plan view of a cylindrical elastic member of a motor drive device for a vehicle according to an embodiment, as seen from the motor chamber side.

[0029] Figure 4 It is a cross-sectional view showing a cylindrical elastic member of a vehicle motor drive device according to a first modified example of one embodiment.

[0030] Figure 5 It is a cross-sectional view showing a cylindrical elastic member of a vehicle motor drive device according to a second modified example of the embodiment. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0032] Reference Figure 1 to Figure 3 The structure of a vehicle motor drive device 100 according to one embodiment will be described.

[0033] like Figure 1 As shown, the vehicle motor drive device 100 is a motor unit mounted on a vehicle such as an electric car for driving. The vehicle motor drive device 100 includes a motor 1 , an inverter 2 , a motor-side wiring 3 , an inverter-side wiring 4 , a housing 5 , and a cylindrical elastic member 6 .

[0034] The motor 1 is a three-phase AC motor for a vehicle. The motor 1 is configured to generate a driving force for moving a driving wheel. The inverter 2 is configured to supply power to the motor 1. That is, the inverter 2 is configured to convert a DC power supplied from a lithium-ion battery (not shown) into an AC power. Thus, the AC power of the U phase, the V phase, and the W phase is supplied to the motor 1.

[0035] The motor-side wiring 3 is an insulated wire formed by covering a metal wire (copper wire, etc.) with an insulator, which connects the motor 1 and the inverter 2. One end of the motor-side wiring 3 is connected to the motor 1. The other end of the motor-side wiring 3 is connected to the inverter-side wiring 4 via the connection terminal 7. In order to supply three-phase AC power of U phase, V phase and W phase to the motor 1, a plurality of motor-side wirings 3 (3) are provided corresponding to the three-phase AC power of U phase, V phase and W phase.

[0036] The inverter-side wiring 4 is an insulated wire formed by covering a metal wire (copper wire, etc.) with an insulator, which connects the motor 1 and the inverter 2. One end of the inverter-side wiring 4 is connected to the inverter 2. The other end of the inverter-side wiring 4 is connected to the motor-side wiring 3 via the connection terminal 7. In order to supply three-phase AC power of U phase, V phase and W phase to the motor 1, a plurality of (3) inverter-side wirings 4 are provided corresponding to the three-phase AC power of U phase, V phase and W phase.

[0037] The other end of the motor-side wiring 3 and the other end of the inverter-side wiring 4 are connected in the inverter chamber 52 described later, not in the motor chamber 51 described later. That is, the other end of the motor-side wiring 3 and the other end of the inverter-side wiring 4 are connected via the connection terminal 7 in the inverter chamber 52 where the oil Ab (an example of "coolant" in the claims) is not stored. Here, the connection terminal 7 is composed of, for example, a round terminal mounted on the other end of the motor-side wiring 3, a round terminal mounted on the other end of the inverter-side wiring 4, and a bolt and a nut connecting the round terminal of the motor-side wiring 3 and the round terminal of the inverter-side wiring 4.

[0038] The case 5 is a metal frame that accommodates the motor 1 , the inverter 2 , etc. The case 5 includes a motor chamber 51 , an inverter chamber 52 , a partition wall 53 , and a through hole 54 .

[0039] The motor chamber 51 is a space provided in the housing 5. The motor 1 is accommodated inside the motor chamber 51. Oil Ab for cooling the heat generating parts of the accommodated motor 1 is stored inside the motor chamber 51. The inverter chamber 52 is a space provided in the housing 5. The inverter chamber 52 is adjacent to the upper side of the motor chamber 51. The inverter 2 is accommodated inside the inverter chamber 52. No oil Ab is stored inside the inverter chamber 52. The partition wall 53 is a wall separating the motor chamber 51 from the inverter chamber 52. The partition wall 53 extends in the horizontal direction.

[0040] The through hole 54 is formed to penetrate the partition wall 53 in the up-down direction. The motor-side wiring 3 extending from the motor 1 accommodated in the motor chamber 51 passes through the through hole 54. A plurality (three) of through holes 54 are formed in the partition wall 53 (housing 5) corresponding to each of the plurality of cylindrical elastic members 6 into which the plurality of motor-side wirings 3 are respectively inserted.

[0041] (Cylindrical elastic member)

[0042] like Figure 1 As shown, in the vehicle motor drive device 100 of the present embodiment, the cylindrical elastic member 6 is fitted into the through hole 54 in order to supply the AC power from the inverter 2 to the motor 1 and ensure the oil tightness and insulation of the motor chamber 51 .

[0043] like Figure 2 and Figure 3 As shown in FIG. 1 , the cylindrical elastic member 6 is an elastically deformable member mounted on the through hole 54 formed in the partition wall 53 in a manner that seals the through hole 54 and the motor-side wiring 3. The cylindrical elastic member 6 is a wire guard ring. The cylindrical elastic member 6 is used in a relatively high temperature portion and therefore has heat resistance. The cylindrical elastic member 6 has oil resistance in order to ensure oil tightness against the oil Ab in the motor chamber 51. The cylindrical elastic member 6 is formed of a rubber material such as acrylic rubber, fluororubber, nitrile rubber, or polyurethane rubber.

[0044] The cylindrical elastic member 6 includes a main body portion 61 , a flange portion 62 , a wiring insertion hole 63 , an inner protrusion 64 , an outer protrusion 65 , and an end-side protrusion 66 .

[0045] The main body 61 is a cylindrical portion extending in the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. A wiring insertion hole 63 is formed in the main body 61. The flange portion 62 is provided at the end portion on the motor chamber 51 side in the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. The flange portion 62 is a circumferential portion protruding from the end portion on the motor chamber 51 side of the main body 61 in a direction orthogonal to the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. The wiring insertion hole 63 is a hole into which the motor-side wiring 3 extending from the motor 1 is inserted. The wiring insertion hole 63 penetrates the main body 61 in the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. The wiring insertion hole 63 has a diameter Di smaller than the diameter of the motor-side wiring 3 in the direction orthogonal to the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. The wiring insertion hole 63 is arranged in the central portion of the main body 61 as viewed from the motor chamber 51 side.

[0046] In order to reduce the contact area between the inner circumferential surface 63a of the wiring insertion hole 63 and the motor-side wiring 3, the inner protrusion 64 is provided on the inner circumferential surface 63a of the wiring insertion hole 63. The inner protrusion 64 is a circular portion protruding from the inner circumferential surface 63a of the wiring insertion hole 63 in a direction orthogonal to the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. A plurality of (two) inner protrusions 64 are arranged in the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. In addition, one or more inner protrusions 64 may be arranged.

[0047] The outer protrusion 65 is provided on the outer peripheral surface 61a of the main body 61 in order to elastically deform between the inner peripheral surface of the through hole 54 of the housing 5. The outer protrusion 65 is a circular portion protruding from the outer peripheral surface 61a of the main body 61 in a direction orthogonal to the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. The outer protrusion 65 is provided in a portion of the outer peripheral surface 61a of the main body 61 that is opposite to the inner peripheral surface of the through hole 54 of the housing 5. A plurality of (two) outer protrusions 65 are arranged in the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. In addition, one or more than three outer protrusions 65 may be arranged.

[0048] The end-side protrusion 66 is provided at the end on the inverter chamber 52 side to prevent it from falling out of the through hole 54. The end-side protrusion 66 is a circumferential portion protruding from the end on the inverter chamber 52 side (the side opposite to the motor chamber 51 side) of the main body 61 in a direction orthogonal to the direction in which the motor chamber 51 and the inverter chamber 52 are arranged. The end-side protrusion 66 engages with the edge of the through hole 54 on the inverter chamber 52 side (the side opposite to the motor chamber 51 side).

[0049] A plurality (three) of the above-described cylindrical elastic members 6 are provided corresponding to each of the plurality (three) of motor-side wires 3 .

[0050] (Effects of this embodiment)

[0051] In this embodiment, the following effects can be obtained.

[0052] In the present embodiment, as described above, the motor drive device 100 for a vehicle includes an elastically deformable cylindrical elastic member 6, which includes a wiring insertion hole 63 for inserting the motor-side wiring 3 extending from the motor 1 accommodated in the motor chamber 51, and is mounted to the through hole 54 in a manner that seals the through hole 54 and the motor-side wiring 3. Thus, it is not necessary to provide a junction box chamber and an insulating junction box in the housing 5, and the oil tightness and insulation of the motor chamber 51 can be ensured by the cylindrical elastic member 6 mounted in the through hole 54 of the housing 5, so that the oil tightness and insulation of the motor chamber 51 can be ensured, and the structure of the device can be simplified.

[0053] In addition, in the present embodiment, as described above, the housing 5 includes: an inverter chamber 52 that accommodates the inverter 2 inside; and a partition wall 53 that separates the motor chamber 51 from the inverter chamber 52 and is formed with a through hole 54. The cylindrical elastic member 6 is mounted on the through hole 54 formed in the partition wall 53. Thus, it is not necessary to provide a junction box chamber and an insulating junction box separately from the inverter chamber 52 and the motor chamber 51 in the housing 5. By mounting the cylindrical elastic member 6 in the through hole 54 formed in the partition wall 53, the oil tightness and insulation of the motor chamber 51 can be ensured, so that the structure of the device can be simplified in the vehicle motor drive device 100 in which the motor 1 and the inverter 2 are unitized.

[0054] In addition, in the present embodiment, as described above, the vehicle motor drive device 100 includes the inverter-side wiring 4 whose one end is connected to the inverter 2 and is arranged in the inverter chamber 52. The other end of the motor-side wiring 3 and the other end of the inverter-side wiring 4 are connected in the inverter chamber 52. Thus, the other end of the motor-side wiring 3 and the other end of the inverter-side wiring 4 are connected in the inverter chamber 52 where no oil Ab is accumulated, so that the oil Ab can be prevented from adhering to the connection portion between the other end of the motor-side wiring 3 and the other end of the inverter-side wiring 4. As a result, the reduction in conductivity caused by the adhesion of the oil Ab can be suppressed.

[0055] In addition, in the present embodiment, as described above, the cylindrical elastic member 6 includes the circumferential inner protrusion 64 protruding from the inner circumferential surface 63a of the wiring insertion hole 63 having a diameter Di smaller than the diameter of the motor-side wiring 3. Thus, the inner protrusion 64 contacts the motor-side wiring 3, and the entire surface of the inner circumferential surface 63a of the wiring insertion hole 63 and the entire surface of the outer circumferential surface of the motor-side wiring 3 are prevented from contacting each other, so that the sliding resistance between the inner circumferential surface 63a of the wiring insertion hole 63 and the motor-side wiring 3 when the motor-side wiring 3 is inserted into the wiring insertion hole 63 can be reduced. As a result, the sealing between the wiring insertion hole 63 and the motor-side wiring 3 can be ensured, and the motor-side wiring 3 can be easily inserted into the wiring insertion hole 63.

[0056] In addition, in the present embodiment, as described above, the cylindrical elastic member 6 includes the circumferential outer protrusion 65 protruding from a portion of the outer peripheral surface 61a facing the inner peripheral surface of the through hole 54 of the housing 5. Thus, the outer protrusion 65 can be elastically deformed between the outer peripheral surface 61a of the cylindrical elastic member 6 and the inner peripheral surface of the through hole 54 of the housing 5, so that the sealing performance between the inner peripheral surface of the through hole 54 of the housing 5 and the outer peripheral surface 61a of the cylindrical elastic member 6 can be improved.

[0057] In addition, in the present embodiment, as described above, a plurality of motor-side wirings 3 are provided to connect the motor 1 and the inverter 2. A plurality of cylindrical elastic members 6 are provided corresponding to each of the plurality of motor-side wirings 3. In the housing 5, a plurality of through holes 54 are formed corresponding to each of the plurality of cylindrical elastic members 6 into which each of the plurality of motor-side wirings 3 is inserted. Here, in the case of a single cylindrical elastic member 6 having a plurality of wiring insertion holes 63 provided corresponding to each of the plurality of motor-side wirings 3, when the plurality of motor-side wirings 3 move due to vibration of the vehicle, the elastic member near the wiring insertion hole 63 into which the wiring on one side is inserted is pulled along with the movement of the wiring on one side of the adjacent motor-side wirings 3, and a gap may be generated between the wiring insertion hole 63 into which the wiring on the other side is inserted and the wiring on the other side. In this case, the oil Ab leaks to the outside of the motor chamber 51 from the gap generated between the wiring insertion hole 63 into which the wiring on the other side is inserted and the wiring on the other side (the sealing performance is reduced). Therefore, by forming a plurality of through holes 54 in the housing 5 corresponding to each of the plurality of cylindrical elastic parts 6 into which the plurality of motor-side wirings 3 are respectively inserted, the generation of gaps between the motor-side wiring 3 and the wiring insertion holes 63 caused by the vibration of the vehicle can be suppressed, thereby suppressing the reduction in the sealing performance between the wiring insertion holes 63 and the motor-side wiring 3.

[0058] [Modifications]

[0059] All points of the above embodiments disclosed this time are only examples and should not be considered as limiting the present invention. The scope of the present invention is indicated by the claims rather than the description of the above embodiments, and includes all changes (modifications) within the meaning and scope equivalent to the claims.

[0060] For example, in the above embodiment, an example is shown in which a plurality (three) of the cylindrical elastic members 6 are provided corresponding to each of the plurality (three) motor-side wirings 3, but the present invention is not limited thereto. Figure 4 As in the first modified example shown, a cylindrical elastic member 206 provided with a plurality (three) of wiring insertion holes 263 corresponding to each of a plurality (three) of motor-side wirings 3 may be attached to the through hole 54 .

[0061] In addition, in the above embodiment, the cylindrical elastic member 6 includes the main body 61, the flange 62, the wiring insertion hole 63, the inner protrusion 64, the outer protrusion 65 and the end protrusion 66, but the present invention is not limited to this. In the present invention, Figure 5 As in the second modified example shown in the figure, the cylindrical elastic member 306 may include only the wiring insertion hole 363 .

[0062] In the above embodiment, the case 5 includes the motor chamber 51 and the inverter chamber 52, but the present invention is not limited thereto. In the present invention, the case may not be provided with the inverter chamber.

[0063] In the above embodiment, the oil Ab for cooling the heat generating parts of the housed motor 1 is stored in the motor chamber 51, but the present invention is not limited thereto. In the present invention, water may be stored in the motor chamber.

[0064] In addition, in the above embodiment, an example is shown in which the other end of the motor-side wiring 3 and the other end of the inverter-side wiring 4 are connected in the inverter chamber 52, but the present invention is not limited to this. In the present invention, the other end of the motor-side wiring and the other end of the inverter-side wiring may also be connected in the motor chamber.

[0065] In the above embodiment, the vehicle motor drive device 100 is an example of a driving motor unit mounted on a vehicle such as an electric vehicle, but the present invention is not limited thereto. In the present invention, the vehicle motor drive device may also be a transmission motor unit mounted on a vehicle such as an electric vehicle.

[0066] [Summary of the present embodiment]

[0067] This embodiment has at least the following structures.

[0068] A motor drive device (100) for a vehicle comprises: a motor (1) for use in a vehicle; an inverter (2) for supplying electric power to the motor (1); a motor-side wiring (3) having one end connected to the motor (1) and used to connect the motor (1) and the inverter (2); a housing (5) comprising a motor chamber (51) for accommodating the motor (1) and storing a coolant (Ab) for cooling the accommodated motor (1), and having a through hole (54) for the motor-side wiring (3) extending from the motor (1) accommodated in the motor chamber (51) to pass through; and an elastically deformable cylindrical elastic member (6, 206, 306) comprising a wiring insertion hole (63, 263, 363) for inserting the motor-side wiring (3) extending from the motor (1), and being mounted on the through hole (54) in a manner that seals the through hole (54) and the motor-side wiring (3).

[0069] According to such a structure, it is not necessary to provide a junction box chamber and an insulating junction box in the housing (5), and the oil tightness and insulation of the motor chamber (51) can be ensured by the cylindrical elastic component (6) installed in the through hole (54) of the housing (5). Therefore, the oil tightness and insulation of the motor chamber (51) can be ensured, and the structure of the device can be simplified.

[0070] The housing (5) further includes: an inverter chamber (52) which accommodates the inverter (2) therein; and a partition wall (53) which separates the motor chamber (51) from the inverter chamber (52) and is provided with a through hole (54), wherein the cylindrical elastic member (6) is mounted on the through hole (54) formed in the partition wall (53).

[0071] According to such a structure, it is not necessary to provide a junction box chamber and an insulating junction box separately from the housing (5) and the inverter chamber (52) and the motor chamber (51). By installing a cylindrical elastic component (6) in a through hole (54) formed in the partition wall (53), the oil tightness and insulation of the motor chamber (51) can be ensured. Therefore, in a vehicle motor drive device (100) in which the motor (1) and the inverter (2) are unitized, the structure of the device can be simplified.

[0072] The vehicle motor drive device (100) also includes an inverter-side wiring (4) having one end connected to the inverter (2) and arranged in an inverter chamber (52), and the other end of the motor-side wiring (3) and the other end of the inverter-side wiring (4) are connected in the inverter chamber (52).

[0073] According to such a structure, the other end of the motor-side wiring (3) and the other end of the inverter-side wiring (4) are connected in the inverter chamber (52) where no oil (Ab) is stored, so that the oil (Ab) can be prevented from adhering to the connection portion between the other end of the motor-side wiring (3) and the other end of the inverter-side wiring (4). As a result, the reduction in conductivity caused by the adhesion of the oil (Ab) can be suppressed.

[0074] The cylindrical elastic member (6) includes a circular inner protrusion (64) protruding from an inner peripheral surface (63a) of a wiring insertion hole (63) having a diameter (Di) smaller than a diameter of the motor-side wiring (3).

[0075] According to such a structure, the inner protrusion (64) contacts the motor-side wiring (3), thereby preventing the entire inner peripheral surface (63a) of the wiring insertion hole (63) from contacting the entire outer peripheral surface of the motor-side wiring (3), thereby reducing the sliding resistance between the inner peripheral surface (63a) of the wiring insertion hole (63) and the motor-side wiring (3) when the motor-side wiring (3) is inserted into the wiring insertion hole (63). As a result, the sealing between the wiring insertion hole (63) and the motor-side wiring (3) can be ensured, and the motor-side wiring (3) can be easily inserted into the wiring insertion hole (63).

[0076] The cylindrical elastic member (6) includes a circumferential outer protrusion (65) protruding from a portion of an outer peripheral surface (61a) facing the inner peripheral surface of the through hole (54) of the housing (5).

[0077] According to such a structure, the outer protrusion (65) can be elastically deformed between the outer peripheral surface (61a) of the cylindrical elastic component (6) and the inner peripheral surface of the through hole (54) of the shell (5), thereby improving the sealing performance between the inner peripheral surface of the through hole (54) of the shell (5) and the outer peripheral surface (61a) of the cylindrical elastic component (6).

[0078] A plurality of motor-side wirings (3) are provided to connect the motor (1) and the inverter (2), a plurality of cylindrical elastic components (6) are provided corresponding to each of the plurality of motor-side wirings (3), and a plurality of through holes (54) are formed in the housing (5) corresponding to each of the plurality of cylindrical elastic components (6) into which each of the plurality of motor-side wirings (3) is respectively inserted.

[0079] Here, in the case of a cylindrical elastic member (6) having a plurality of wiring insertion holes (63) corresponding to each of a plurality of motor-side wirings (3), when the plurality of motor-side wirings (3) move due to vibration of the vehicle, the elastic member near the wiring insertion hole (63) into which the wiring on one side is inserted is pulled in accordance with the movement of the wiring on one side of the adjacent motor-side wirings (3), and a gap may be generated between the wiring insertion hole (63) into which the wiring on the other side is inserted and the wiring on the other side. In this case, the oil (Ab) leaks out of the motor chamber (51) from the gap generated between the wiring insertion hole (63) into which the wiring on the other side is inserted and the wiring on the other side (the sealing performance is reduced). Therefore, by forming a plurality of through holes (54) in the housing (5) corresponding to each of the plurality of cylindrical elastic components (6) into which the plurality of motor-side wirings (3) are respectively inserted, the generation of gaps between the motor-side wirings (3) and the wiring insertion holes (63) caused by the vibration of the vehicle can be suppressed, thereby suppressing the reduction in the sealing performance between the wiring insertion holes (63) and the motor-side wirings (3).

[0080] Description of Reference Numerals

[0081] 1…motor; 2…inverter; 3…motor-side wiring; 4…inverter-side wiring; 5…housing; 6, 206, 306…cylindrical elastic member; 51…motor chamber; 52…inverter chamber; 53…partition wall; 54…through hole; 61a…outer peripheral surface; 63, 263, 363…wiring insertion hole; 63a…inner peripheral surface; 64…inner protrusion; 65…outer protrusion; 100…motor drive device for vehicle; Ab…oil (coolant).

Claims

1. A motor drive device for a vehicle, wherein: have: A motor for a vehicle; an inverter that supplies power to the motor; a motor-side wiring, one end of which is connected to the motor and is used to connect the motor to the inverter; a housing including a motor chamber in which the motor is housed and in which a coolant for cooling the housed motor is stored, and a through hole formed in which the motor-side wiring extending from the motor housed in the motor chamber passes; and An elastically deformable cylindrical elastic member includes a wiring insertion hole into which the motor-side wiring extending from the motor is inserted, and is attached to the through hole so as to seal a space between the through hole and the motor-side wiring.

2. The vehicle motor drive device according to claim 1, wherein: The housing further comprises: an inverter chamber that accommodates the inverter inside; and a partition wall which separates the motor room from the inverter room and has the through hole formed therein, The cylindrical elastic member is attached to the through hole formed in the partition wall.

3. The motor drive device for a vehicle according to claim 2, wherein: It also includes an inverter-side wiring having one end connected to the inverter and arranged in the inverter chamber, The other end of the motor-side wiring and the other end of the inverter-side wiring are connected in the inverter chamber.

4. The motor drive device for a vehicle according to claim 1, wherein: The cylindrical elastic member includes a circumferential inner protrusion that protrudes from an inner peripheral surface of the wiring insertion hole having a diameter smaller than a diameter of the motor-side wiring.

5. The vehicle motor drive device according to claim 1, wherein: The cylindrical elastic member includes a circumferential outer protrusion that protrudes from a portion of an outer peripheral surface that faces an inner peripheral surface of the through hole of the housing.

6. The vehicle motor drive device according to claim 1, wherein: The motor side wiring is provided with a plurality of wirings to connect the motor and the inverter. The cylindrical elastic member is provided in plurality corresponding to each of the plurality of motor-side wirings. The housing has a plurality of through holes formed therein corresponding to each of the plurality of cylindrical elastic members into which the plurality of motor-side wires are respectively inserted.

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