Electric unit

Abstract

To achieve both lubricity and avoidance of leakage of electromagnetic wave noise in an electric unit in which a rotating shaft for outputting torque to the outside and an electric motor are arranged in the same housing chamber.SOLUTION: An electric motor (2) is arranged inside a predetermined casing (5), a rotating shaft (4) for transmitting torque to the outside of the casing (5) is arranged inside the casing (5) and below the electric motor (2), and oil which has cooled or lubricated the electric motor (2) is supplied toward the rotating shaft (4), wherein a shielding wall (25) for shielding electromagnetic waves from the electric motor (2) toward the rotating shaft (4) is provided between the electric motor (2) and the rotating shaft (4) inside the casing (5), and an oil flow path for flowing down the oil from the electric motor (2) side toward the rotating shaft (4) side is provided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric unit having an integrated structure in which an electric motor and a transmission mechanism are housed in a predetermined casing. [Background technology]

[0002] An example of a vehicle power transmission device configured to transmit torque output by an electric motor to drive wheels via a power transmission path is described in Patent Document 1. The configuration includes a rotating machine (motor or motor-generator) as a driving power source. The rotating machine operates on power supplied via an inverter, and the power transmission path that transmits the output torque to the drive wheels includes a mechanical connecting member, which is made of an electrically insulating material.

[0003] In the configuration described in Patent Document 1, the power transmission path constitutes a path through which high-frequency components of the shaft voltage caused by the inverter are transmitted to the drive shaft. In other words, there is a possibility that high-frequency components of electromagnetic noise may leak to the outside via the drive shaft, but in the configuration described in Patent Document 1, the mechanical connecting member that transmits drive torque to the drive shaft is made of an electrically insulating material, so it is possible to block the transmission of high-frequency components and reduce the high-frequency components of electromagnetic noise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-086642 Summary of the Invention [Problem to be solved by the invention]

[0005] The invention described in Patent Document 1 is an invention configured to interrupt electrical conduction along the power transmission path, for example, by constructing one of multiple mechanical connecting members constituting the power transmission path from the motor to the drive shaft using an electrically insulating material. This configuration is effective when a component receiving electromagnetic waves is separated from a component exposed to the outside and a mechanical connecting member made of an electrically insulating material is interposed between them. However, when an electromagnetic wave source, such as an inverter or motor, is located close to a mechanical connecting member that is at least partially exposed to the outside of the casing or connected to an external component within the casing, it is difficult to reduce or block electromagnetic noise. In other words, in a structure where an electromagnetic wave source is close to a component transmitting electromagnetic waves to the outside, the entire component receives the electromagnetic waves. Therefore, to prevent the component from transmitting electromagnetic waves to the outside, the component itself must be made of an electrically insulating material. However, it is difficult to construct torque-transmitting components from electrically insulating materials due to requirements for strength, durability, ease of processing, etc. Therefore, in a device in which the electromagnetic wave generating source and the mechanical connecting member that transmits torque to the outside are located close to each other within the same casing, it is difficult to reduce electromagnetic wave noise using the configuration described in Patent Document 1.

[0006] The present invention has been made with a focus on the above-mentioned technical problems, and aims to reduce electromagnetic noise generated by an electric unit in which an electric motor such as a motor or motor-generator and a rotating shaft that transmits the torque output by the electric motor to the outside are housed inside a specified casing. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides an electric unit in which an electric motor is arranged inside a specified casing, and a rotating shaft that transmits torque to the outside of the casing is arranged inside the casing and below the electric motor, and oil that cools or lubricates the electric motor is supplied to the rotating shaft, and is characterized in that a shielding wall is provided inside the casing between the electric motor and the rotating shaft to block electromagnetic waves from the electric motor toward the rotating shaft, and an oil flow path is provided to allow the oil to flow down from the electric motor side toward the rotating shaft side.

[0008] In the present invention, the shielding wall may be made of a conductive material that reflects or absorbs the electromagnetic waves.

[0009] In the present invention, the oil flow path may be formed by a through-hole that penetrates the shielding wall in the vertical direction.

[0010] In the present invention, the shielding wall may be composed of a first shielding plate and a second shielding plate arranged below the first shielding plate, the through hole may be formed in the first shielding plate and the second shielding plate, the through hole of the first shielding plate and the through hole of the second shielding plate may be positioned offset from each other in the horizontal direction, the through hole of the first shielding plate may be closed in the vertical direction by the second shielding plate, and the through hole of the second shielding plate may be closed in the vertical direction by the first shielding plate.

[0011] In the present invention, the shielding wall may be composed of a first shielding plate and a second shielding plate arranged below the first shielding plate, the first shielding plate and the second shielding plate having tip portions at different positions in the horizontal direction, the first shielding plate sloping downward toward the tip portion of the first shielding plate, and the second shielding plate sloping downward toward the tip portion of the second shielding plate.

[0012] In the present invention, the casing has a storage chamber that is partitioned by a partition portion that is arranged on one end side in the direction of the central axis of rotation of the motor and a cover member that is attached at a position opposite the partition portion, and that houses the motor, the rotating shaft, and the shielding wall, and the partition portion is provided with a guide portion that defines at least three positions on the outer periphery of the motor, and the shielding wall may be constituted by a plate-shaped portion that extends, on the underside of the motor, part of the guide portion in the direction of the central axis of rotation of the motor.

[0013] In the present invention, the plate-like portion may have a curved shape that follows the curved shape of the outer peripheral surface of the electric motor. [Effects of the Invention]

[0014] According to the present invention, electromagnetic waves are generated as noise when power is supplied to the electric motor or when the electric motor is rotated by an external force to generate electricity. However, these electromagnetic waves are reflected or absorbed by the shielding wall and do not reach the rotating shaft. Alternatively, the amount of electromagnetic waves that reach the rotating shaft is reduced. Therefore, even if the rotating shaft transmits torque to the outside of the casing, it is possible to avoid or suppress the radiation of electromagnetic noise to the outside via the rotating shaft. Furthermore, even if a shielding wall is interposed between the electric motor and the rotating shaft, oil that flows down from the electric motor flows through the oil flow path toward the rotating shaft, thereby ensuring sufficient lubrication of the rotating shaft and its bearings.

[0015] Furthermore, according to the present invention, the position of the motor within the housing can be determined by the guide member, which facilitates the assembly of the motor, and at least a portion of the guide member and the shielding wall can be made common, which simplifies the structure of the casing or the overall structure of the electric unit. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a vertical cross-sectional view schematically showing an electric unit according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the inside of the first storage chamber as seen from the first cover side. [Figure 3] FIG. 2 is a schematic cross-sectional view showing the relative positional relationship of each shielding plate. [Figure 4] 1A and 1B are plan views showing the shapes of through-holes, in which (a) shows a round through-hole and (b) shows a slit through-hole. [Figure 5] 10A and 10B are diagrams showing another example of the shielding plate, in which (a) is a front view of the first cover as seen from the inner surface side, and (b) is a front view of the partition wall as seen from the first cover side. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the embodiment described below is merely an example of how the present invention can be implemented, and is not intended to limit the present invention.

[0018] First, the overall configuration of an electric unit 1 in an embodiment of the present invention will be described. Fig. 1 is a vertical cross-sectional view for explaining the overall configuration of the electric unit 1, which is configured to transmit torque output by an electric motor 2 to a rotating shaft 4 via a transmission mechanism 3, and output torque from the rotating shaft 4 to a predetermined driven object (not shown). The electric motor 2, transmission mechanism 3, and rotating shaft 4 are all disposed inside a predetermined casing 5.

[0019] The casing 5 has a hollow structure with openings on both the left and right ends and a partition wall 6 in the center. A first cover 7 is attached to one of the openings, and a first storage chamber 8 is formed between the first cover 7 and the partition wall 6. A second cover 9 is attached to the other opening, and a second storage chamber 10 is formed between the second cover 9 and the partition wall 6. The first cover 7 and second cover 9 correspond to the cover members in this embodiment of the present invention.

[0020] In the example shown in Fig. 1, the electric motor 2 is disposed inside the first housing chamber 8. The electric motor 2 is an electric motor or a motor / generator that has a power generating function, and has a cylindrical stator 11 fixed to the inner wall surface of the first housing chamber 8. A rotor 12 is disposed inside the stator 11, concentrically with the stator 11. The rotor shaft 13 is rotatably held by a bearing 14 provided in the partition wall 6 and a bearing 15 provided in the first cover 7.

[0021] The transmission mechanism 3 is disposed inside the second housing 10. In the example shown in FIG. 1 , the transmission mechanism 3 is configured as a gear reduction mechanism. For example, a drive gear 16 is disposed on an extension axis of the rotor shaft 13. The drive gear 16 is attached to a drive shaft 17 connected to the rotor shaft 13 and rotates by the torque output by the electric motor 2. A counter shaft 18 is disposed parallel to the drive shaft 17. The counter shaft 18 is rotatably supported by the partition wall 6 and the second cover 9 via bearings (not shown). A driven gear 19, which has a larger diameter than the drive gear 16 and meshes with the drive gear 16, is attached to the counter shaft 18. A drive gear 20, which has a smaller diameter than the driven gear 19, is attached to the counter shaft 18. Therefore, the drive gear 20 rotates at a slower speed than the drive gear 16, which rotates together with the rotor shaft 13.

[0022] The power transmission mechanism 3 further includes a differential mechanism 21. In the example shown in FIG. 1 , the differential mechanism 21 is a differential gear unit of a known configuration in which a pair of left and right side gears and pinion gears meshing with the side gears are held inside the differential case. The differential mechanism 21 is disposed inside the second housing 10, below it, with the central axis of rotation (the central axis of rotation of the side gears) parallel to the drive shaft 17 and the countershaft 18. A ring gear 22 integrated with the differential case meshes with a drive gear 20 attached to the countershaft 18. Furthermore, a rotary shaft 4 is connected to each of the left and right side gears.

[0023] One of these two rotating shafts 4 (the left rotating shaft in FIG. 1) penetrates through the partition wall 6 and the first cover 7 and is rotatably supported by bearings 23, 24 provided in the penetrated portion. One end of the rotating shaft 4 is exposed to the outside of the casing 5. A driven member such as an axle (not shown) is connected to this end exposed to the outside of the casing 5. The other of the two rotating shafts 4 (the right rotating shaft in FIG. 1) 4 penetrates through the second cover 9 and is exposed to the outside of the casing 5, and an axle (not shown) is connected to this end.

[0024] Because the differential mechanism 21 is disposed below the second housing chamber 10, the rotating shaft 4 connected to the differential mechanism 21 is also disposed in a lower portion of the casing 5. Inside the first housing chamber 8, the rotating shaft 4 is disposed below it, while the electric motor 2 is disposed at a higher position (above) than the rotating shaft 4. Oil for cooling and lubrication is supplied to the electric motor 2. The oil supplying mechanism may be a conventionally known mechanism, such as a mechanism in which oil is sprayed or dripped from the upper inner surface of the first housing chamber 8, or a mechanism in which oil is sprayed radially outward from the rotor shaft 13. The oil that has cooled or lubricated the electric motor 2 falls inside the first housing chamber 8 and falls onto the rotating shaft 4, lubricating it and the bearings 23 and 24 that support it.

[0025] The electric motor 2 is, for example, a permanent magnet three-phase synchronous motor, which is rotated by a high-frequency current supplied via a bus bar (not shown) and is also rotated by torque input from the rotating shaft 4 side, generating an electromotive force. As a result, electromagnetic waves are generated as noise as the electric motor 2 rotates. Because the casing 5 described above is made of a metal (conductive material) with high conductivity, electromagnetic waves that become noise generated from the electric motor 2 and the three-phase bus bar inside the first housing chamber 8 are basically absorbed or reflected inside the first housing chamber 8 and do not leak to the outside. However, because the rotating shaft (sometimes referred to as an intermediate shaft) 4, which is arranged together with the electric motor 2 inside the first housing chamber 8, is made of a metal with high conductivity, electromagnetic waves generated as noise may propagate to the rotating shaft 4 and leak from the rotating shaft 4 to the outside.

[0026] In this embodiment of the present invention, a shielding wall 25 is provided to avoid or suppress leakage of electromagnetic noise via the rotating shaft 4. The shielding wall 25 is a partition wall that blocks electromagnetic waves directed from the electric motor 2 side toward the rotating shaft 4 side and allows oil to flow down from the electric motor 2 side to the rotating shaft 4 side. Therefore, the shielding wall 25 is formed into a plate shape from a metal with high conductivity, and is arranged inside the first housing chamber 8 between the electric motor 2 and the rotating shaft 4.

[0027] 2, the shielding wall 25 is sized to conceal the electric motor 2 relative to the rotating shaft 4 in the vertical direction of the first housing chamber 8, and therefore its width and length are the same as the width and length of the first housing chamber 8 at the location where the shielding wall 25 is provided. The oil flow path for causing the oil to flow downward can have various configurations depending on the location where the oil is to be guided. For example, it may be an oil groove (not shown) formed in the upper surface of the shielding wall 25, and the oil may be guided from this oil groove to an oil passage provided on the inner surface of the partition portion 6 or the first cover 7. Alternatively, the oil flow path may be formed by a through-hole that penetrates the shielding wall 25 in its thickness direction (vertical direction).

[0028] If the oil flow path is configured using a through hole, it is possible that electromagnetic noise may pass through the through hole toward the rotating shaft 4. Therefore, when the oil flow path is configured using a through hole, a configuration is adopted that blocks the electromagnetic noise that passes through the through hole. An example of this is shown in FIGS. 1 to 3. In this example, the shielding wall 25 is configured using two shielding plates 25a and 25b. These shielding plates 25a and 25b are arranged with a vertical offset. The upper first shielding plate 25a is provided, for example, so as to extend from the inner surface of the first cover 7 toward the partition wall portion 6. In contrast, the lower second shielding plate 25b is provided, for example, so as to extend from the inner surface of the partition wall portion 6 toward the first cover 7.

[0029] The first shielding plate 25a has a leading end separated from the partition wall 6, and similarly, the second shielding plate 25b has a leading end separated from the first cover 7. A plurality of through holes 26 serving as oil flow paths are formed near the leading end of the first shielding plate 25a. In contrast, a plurality of through holes 27 serving as oil flow paths are formed near the leading end of the second shielding plate 25b. The through holes 26 in the first shielding plate 25a and the through holes 27 in the second shielding plate 25b are offset from each other in the horizontal direction (the left-right direction in FIGS. 1 and 3). Therefore, these through holes 26, 27 are not linearly connected in the vertical direction. In other words, the lower side of the through hole 26 in the first shielding plate 25a faces the plate surface of the second shielding plate 25b without the through hole 27, and the through hole 26 is closed in the vertical direction by the second shielding plate 25b. Similarly, the upper side of the through hole 27 in the second shielding plate 25b is opposed to the plate surface of the first shielding plate 25a that does not have the through hole 26, and the through hole 27 is closed in the vertical direction by the first shielding plate 25a.

[0030] The through holes 26, 27 may have any suitable shape as needed. For example, they may be round holes as shown in FIG. 4(a) or elongated rectangular slit holes as shown in FIG. 4(b). Furthermore, as shown in FIG. 3, each of the shielding plates 25a, 25b may be inclined downward so that the tip side is lowered. This is to allow the oil 28 to flow down the upper surface of each of the shielding plates 25a, 25b under its own weight and drop from the tip of each of the shielding plates 25a, 25b. In this case, it can be said that the inclined upper surfaces of the shielding plates 25a, 25b form an oil flow path.

[0031] Here, the structure for providing the above-mentioned shielding wall 25 and shielding plates 25a, 25b inside the first storage chamber 8 will be described. These shielding wall 25 and shielding plates 25a, 25b may be integrated with the casing 5 inside the first storage chamber 8, and therefore the first shielding plate 25a may be cast integrally with the first cover 7, or may be welded or screwed to the inner surface of the first cover 7. Similarly, the second shielding plate 25b may be cast integrally with the casing 5, or may be welded or screwed to the inner surface of the partition wall portion 6.

[0032] Another example of the shielding wall 25 will be described with reference to FIG. 5. FIG. 5(a) is a front view of the first cover 7 as seen from the inner surface side, and FIG. 5(b) is a front view of the partition wall 6 facing the first cover 7 as seen from the first cover 7 side. Since the rotor shaft 13 of the electric motor 2 penetrates the partition wall 6, the electric motor 2 is positioned (or aligned) on the inner surface of the partition wall 6 and then fixed to the partition wall 6. Ribs 29 for this positioning are provided on the inner surface of the partition wall 6. In the example shown in FIG. 5, four ribs 29 are provided radially from the center of the electric motor 2, and the central end of each rib 29 is located on a circumference with the same diameter as the outer diameter of the electric motor 2. Note that since the ribs 29 are used to determine the position of the electric motor 2 on the inner surface of the partition wall 6, at least three ribs are sufficient. The ends of these ribs 29 serve as so-called positioning portions (or guide portions), and the position of the motor 2 is determined by inserting the motor 2 into the first accommodating chamber 8 from the open end side of the casing 5 without attaching the first cover 7, and bringing the outer peripheral surface of the tip side of the motor 2 into contact with the end portion of each rib 29 on the center side.

[0033] These ribs 29 are linear protrusions raised on the inner surface of the partition wall 6. Of these ribs 29, a shielding plate 25c is provided between the ends of two of the ribs 29 located below the electric motor 2. This shielding plate 25c is a plate-shaped portion connecting the ends of the two ribs 29, and is curved downward with substantially the same curvature as the curvature of the outer peripheral surface of the electric motor 2 so as to contact or fit along the outer peripheral surface of the electric motor 2, and extends horizontally toward the first cover 7. Its tip may be in contact with the inner surface of the first cover 7 or may be separated from it. Therefore, the electric motor 2 may be supported from below by this shielding plate 25c. A through-hole 27 is formed at an appropriate position in this shielding plate 25c.

[0034] In contrast, the first cover 7 is provided with a shielding plate 25d located below the shielding plate 25c. Together with the shielding plate 25c provided in the partition wall 6, this shielding plate 25d serves to block electromagnetic waves directed toward the rotating shaft 4 and allow oil to flow downward toward the rotating shaft 4. Therefore, the shielding plate 25d is located lower than the shielding plate 25c provided in the partition wall 6 and extends horizontally from the inner surface of the first cover 7 toward the partition wall 6. The shielding plate 25d may be a simple flat plate, or, as shown in FIG. 5(a), may be a curved plate that is concave downward and whose upper surface serves as a so-called receiving surface. The curved shape may be any appropriate shape, such as a circular arc or an elliptical arc. Furthermore, the outer peripheral edge of the shielding plate 25d may contact the inner surface of the casing 5 or the inner surface of the partition wall 6 to separate the area where the electric motor 2 is located from the area where the rotating shaft 4 is located.

[0035] A plurality of through holes 26 are formed in the shielding plate 25d, penetrating vertically. These through holes 26 and through holes 27 in the shielding plate 25c provided in the partition portion 6 are offset from each other in the horizontal direction, such as the width direction or depth direction of the first housing chamber 8. This is because, as in the example shown in Fig. 3, one of the through holes 26, 27 is closed in the vertical direction (the direction of a straight line connecting the electric motor 2 and the rotating shaft 4) by the other of the shielding plates 25c, 25d.

[0036] In the electric unit 1 described above, when a current is passed through the electric motor 2 to rotate it, or when the electric motor 2 is rotated as a generator by torque transmitted from the rotating shaft 4, electromagnetic noise is generated from the electric motor 2. The electric motor 2 and the rotating shaft 4 are disposed inside the first housing chamber 8, and a shielding wall 25 is disposed between them. Therefore, electromagnetic noise generated from the electric motor 2, the three-phase bus bar, or the like is reflected or absorbed by the shielding wall 25. For example, as illustrated in FIG. 3 , a portion of the electromagnetic noise (incident wave W1) directed toward the shielding plate 25a is absorbed by the shielding plate 25a. Another portion becomes a reflected wave W2 and is prevented from transmitting to the rotating shaft 4 side. Furthermore, still another portion of the incident wave W1 may pass through the through hole 26 and reach the lower shielding plate 25b. However, because the plate surface of the lower shielding plate 25b faces the through hole 26, the electromagnetic noise that passed through the through hole 26 is absorbed or reflected by the lower shielding plate 25b. Ultimately, electromagnetic noise generated from the electric motor 2 or the three-phase bus bar, etc., is blocked by these shielding plates 25a, 25b and does not reach the rotating shaft 4, or the amount of electromagnetic noise propagating to the rotating shaft 4 is reduced, thereby eliminating or suppressing electromagnetic noise leaking to the outside of the casing 5 via the rotating shaft 4. In other words, an electric unit 1 with low electromagnetic noise can be obtained.

[0037] Furthermore, shielding wall 25 has oil flow paths such as through holes 26 and 27 that allow oil flowing down from electric motor 2 to flow toward rotating shaft 4, so that oil can be supplied to rotating shaft 4 and its bearings 23 and 24, even if shielding wall 25 is disposed between electric motor 2 and rotating shaft 4. Note that oil that has flowed down to the bottom of first housing chamber 8 is returned to an oil pan (not shown) or the like via an appropriate flow path formed in casing 5, and is also pumped up by an oil pump (not shown) and supplied to electric motor 2, etc. Therefore, electric unit 1 in this embodiment of the present invention can achieve both blocking or reducing electromagnetic noise and good lubrication.

[0038] The present invention is not limited to the above-described embodiment and can be modified as appropriate within the scope of achieving the object of the present invention. For example, the present invention does not necessarily require the above-described transmission mechanism 3, and the transmission mechanism 3 is not limited to the above-described configuration. Furthermore, the rotating shaft may be any device that outputs torque to the outside of the casing, and the transmitted torque is not limited to that output by the electric motor. Furthermore, the rotating shaft does not necessarily need to protrude from the casing; its end may face an opening in the casing, and another rotating member inserted through the opening may be connected to the rotating shaft. Furthermore, the casing of the present invention may have a housing chamber that houses the electric motor and the rotating shaft, but may not have a housing chamber that houses the above-described transmission mechanism. Furthermore, the shielding wall may be composed of one shielding wall or three or more shielding plates. These shielding walls and shielding plates are required only to have the property of reflecting or absorbing electromagnetic noise, and may be composed of a composite material such as a metal plate or metal wire and a synthetic resin. [Explanation of symbols]

[0039] 1 Electric unit 2 electric motor 3 Transmission mechanism 4 rotation axes 5 Casing 6 Partition wall 7 First Cover 8 First Containment Cell 9 Second Cover 10 Second Containment Cell 11 Stator 12 rotors 13 Rotor shaft 14,15 Bearings 16 Drive gear 17 Drive shaft 18 Counter shaft 19 Driven gear 20 Drive gear 21 Differential mechanism 22 Ring gear 23,24 Bearings 25 Shielding Wall 25a,25b,,25c,25d Shield plate 26,27 Through holes 28 Oil 29 Ribs W1 incident wave W2 reflected wave

Claims

1. An electric unit in which an electric motor is disposed inside a predetermined casing, and a rotating shaft that transmits torque to the outside of the casing is disposed inside the casing and below the electric motor, and oil that has cooled or lubricated the electric motor is supplied toward the rotating shaft, a shielding wall is provided inside the casing between the electric motor and the rotary shaft to block electromagnetic waves directed from the electric motor to the rotary shaft; An oil flow path is provided to allow the oil to flow down from the electric motor side toward the rotary shaft side. An electric unit characterized by:

2. 2. The electric unit according to claim 1, The shielding wall is made of a conductive material that reflects or absorbs the electromagnetic waves. An electric unit characterized by:

3. 2. The electric unit according to claim 1, The oil flow path is formed by a through hole that penetrates the shielding wall in the vertical direction. An electric unit characterized by:

4. 4. The electric unit according to claim 3, the shielding wall is composed of a first shielding plate and a second shielding plate disposed below the first shielding plate, The through holes are formed in the first shielding plate and the second shielding plate, and the through holes of the first shielding plate and the second shielding plate are positioned so as to be shifted from each other in the horizontal direction, and the through holes of the first shielding plate are closed in the vertical direction by the second shielding plate, and the through holes of the second shielding plate are closed in the vertical direction by the first shielding plate. An electric unit characterized by:

5. 5. An electric unit according to claim 1, the shielding wall is composed of a first shielding plate and a second shielding plate disposed below the first shielding plate, the first shielding plate and the second shielding plate have tip portions that are positioned differently from each other in a horizontal direction, The first shielding plate is inclined downward toward the tip end of the first shielding plate, and the second shielding plate is inclined downward toward the tip end of the second shielding plate. An electric unit characterized by:

6. 5. An electric unit according to claim 1, the casing has an accommodation chamber that is partitioned by a partition wall portion that is disposed on one end side in a direction of a rotational center axis of the electric motor and a cover member that is attached at a position facing the partition wall portion, and that accommodates the electric motor, the rotating shaft, and the shielding wall; the partition wall is provided with guide portions that define at least three positions of an outer periphery of the motor, The shielding wall is configured by a plate-like portion that extends in the direction of the rotational axis of the motor and that is part of the guide portion below the motor. An electric unit characterized by:

7. 7. The electric unit according to claim 6, The plate-like portion has a curved shape that follows the curved shape of the outer peripheral surface of the electric motor. An electric unit characterized by:

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