Electric drive unit

Abstract

An electric drive unit capable of supplying a liquid medium to a speed reduction mechanism well. The electric drive unit has an electric motor, a speed reduction mechanism, and a unit housing. The speed reduction mechanism includes a large-diameter gear (55) and a small-diameter gear (54) that rotate integrally around a rotation shaft (52a), and a shaft support portion (57) that supports the rotation shaft (52a). The unit housing stores oil for cooling and / or lubrication, and the liquid medium is at least lifted by the large-diameter gear. The electric drive unit further includes a liquid guide portion (60) that is provided above the speed reduction mechanism and guides the oil to the speed reduction mechanism. The liquid guide portion is disposed at a position overlapping the large-diameter gear, the small-diameter gear, and the shaft support portion in a radial direction of the rotation shaft (52a), is disposed at a position overlapping the large-diameter gear at one end in an axial direction of the rotation shaft as viewed in the radial direction, and is disposed at a position overlapping the shaft support portion at the other end in the axial direction as viewed in the radial direction.

Description

Technical Field

[0001] The present invention relates to an electric drive unit that transmits the rotation of the rotor shaft of an electric motor to the output shaft via a reduction gear. Background Technology

[0002] In recent years, efforts to achieve a low-carbon or decarbonized society have been actively underway, and research and development related to electrification technologies have been carried out in order to reduce CO2 emissions and improve energy efficiency in vehicles.

[0003] For example, Patent Document 1 describes a drive device for a vehicle, comprising: an electric motor; a housing having a storage section for storing liquid fluid; a planetary gear having a large-diameter pinion and a small-diameter pinion, the large-diameter pinion being immersed in the storage section; and a fluid guiding section that guides the liquid fluid raised by the large-diameter pinion to the electric motor.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-106416 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the drive device described in Patent Document 1, there is room for research into a structure that can also effectively guide the liquid fluid to small-diameter pinions and planetary carriers supporting planetary gears.

[0009] The present invention provides an electric drive unit capable of supplying liquid medium to a deceleration mechanism.

[0010] Solution for solving the problem

[0011] This invention relates to an electric drive unit comprising:

[0012] Electric motor;

[0013] A speed reduction mechanism includes a rotating shaft, a large-diameter gear and a small-diameter gear that rotate integrally around the rotating shaft, and a shaft support portion disposed at the end of the rotating shaft and supporting the rotating shaft; and

[0014] The unit housing houses the electric motor and the reduction gear mechanism.

[0015] The electric drive unit transmits the rotation of the motor's rotor shaft to the output shaft via the reduction mechanism.

[0016] in,

[0017] The unit housing contains a liquid medium for cooling and / or lubrication, which is at least lifted by the large-diameter gear.

[0018] The electric drive unit also includes a liquid guiding section, which is disposed above the reduction mechanism and is used to guide the liquid medium to the reduction mechanism.

[0019] When viewed radially from the rotating shaft, the fluid guiding portion is positioned to overlap with the large-diameter gear, the small-diameter gear, and the shaft support portion.

[0020] One end of the fluid guiding section, when viewed radially, is positioned to overlap with the large-diameter gear.

[0021] The other end of the liquid guiding portion in the axial direction is positioned to overlap with the shaft support portion when viewed from the radial direction.

[0022] Invention Effects

[0023] According to the present invention, a liquid medium can be supplied to the deceleration mechanism effectively. Attached Figure Description

[0024] Figure 1 This is a schematic diagram conceptually representing an electric drive unit according to one embodiment of the present invention.

[0025] Figure 2 This is a partial sectional view showing the specific structure of the second planetary gear mechanism and the fluid guiding section of the reduction mechanism.

[0026] Figure 3 It is along Figure 2 A cross-sectional view along line III-III.

[0027] Figure 4 This is a three-dimensional view of the liquid guiding section located on the ring component.

[0028] Figure 5 It is a three-dimensional view of the fluid-conducting part with the connecting part formed in the first modified example.

[0029] Figure 6 This is a three-dimensional view of the fluid-conducting portion with the second modified example of the connecting portion.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1 Electric drive unit

[0032] 2 Unit Housing

[0033] 3. Electric motor

[0034] 4. Rotor shaft

[0035] 5. Reduction Mechanism

[0036] 52a Rotating Shaft

[0037] 54 Small Diameter Gears

[0038] 55 Large Diameter Gear

[0039] 57 Shaft Support

[0040] 60 Liquid guiding section

[0041] 60a End (the other end)

[0042] 60b End (One End)

[0043] 61 First liquid guiding section

[0044] 62 Second liquid guiding section

[0045] 63 Third liquid guiding section

[0046] 65 Connecting parts

[0047] 66. Protrusion

[0048] 67. Storage Department. Detailed Implementation

[0049] Hereinafter, an embodiment of the electric drive unit of the present invention will be described with reference to the accompanying drawings. The drawings are viewed along the directions indicated by the reference numerals.

[0050] The electric drive unit 1 is installed in an electric vehicle. The electric vehicle is a battery-powered electric vehicle, including plug-in hybrid electric vehicles, hybrid electric vehicles, and fuel cell vehicles. The electric drive unit 1 can be used for front-wheel drive or rear-wheel drive. Furthermore, when the electric vehicle is all-wheel drive, the electric drive unit 1 can drive the main drive wheel, which bears a relatively large torque, or the driven wheel, which bears a relatively small torque.

[0051] like Figure 1 As shown, the electric drive unit 1 includes a unit housing 2, an electric motor 3 serving as the drive source for the electric vehicle, a reduction mechanism 5 for reducing the rotation of the electric motor 3, and a pair of left and right output shafts 11 and 12 connected to the reduction mechanism 5. The electric motor 3 and the reduction mechanism 5 are housed in the unit housing 2. The output shafts 11 and 12 extend outward from the unit housing 2 and are connected to an axle via a coupling. Drive wheels of the electric vehicle are mounted at each end of the axle. In the following description, the output shafts 11 and 12 are referred to axially ( Figure 1 The right end (in the left-right direction) is also called the first end, and the left end is also called the second end. Output shaft 11 is disposed on the first end, and output shaft 12 is disposed on the second end.

[0052] The electric motor 3 is, for example, a three-phase motor, comprising a rotor 31 with multiple permanent magnets and a stator 32 with coils wound around the three phases. The rotor 31 is rotatably housed within the unit housing 2. The stator 32 is disposed around the rotor 31 and fixed to the inner periphery of the unit housing 2.

[0053] A cylindrical rotor shaft 4 is inserted into and fixed to the rotor 31. The rotor shaft 4 rotates integrally with the rotor 31. The output shaft 11 is inserted into the rotor shaft 4 in a coaxial and rotatable manner.

[0054] The reduction mechanism 5 includes a first planetary gear mechanism 51 and a second planetary gear mechanism 52. The first planetary gear mechanism 51 is positioned closer to the motor 3 than the second planetary gear mechanism 52. The first planetary gear mechanism 51 is connected to the rotor shaft 4 and the output shaft 11. The second planetary gear mechanism 52 is connected to the first planetary gear mechanism 51 and the output shaft 12.

[0055] The first planetary gear mechanism 51 is formed on the rotor shaft 4 and includes a sun gear S1 that rotates integrally with the rotor shaft 4, a plurality of planetary gears P1 that mesh with the sun gear S1, a planet carrier C1 that supports the planetary gears P1, and a gear ring R1 that meshes with the planetary gears P1.

[0056] For example, three planetary gears P1 are provided. Each planetary gear P1 is configured to rotate about a rotation axis 51a parallel to the rotor shaft 4. While revolving around the sun gear S1 (rotor shaft 4), each planetary gear P1 also rotates on its own axis 51a.

[0057] The planet carrier C1 supports the rotating shaft 51a of the planetary gear P1 and is splined with the output shaft 11, thus rotating together with the output shaft 11.

[0058] A gear portion that meshes with planetary gear P1 is provided on the inner circumferential surface of the gear ring R1. The gear ring R1 is connected to the sun gear S2 of the second planetary gear mechanism 52 via the connecting portion 53. The gear ring R1 and the sun gear S2 rotate as a unit.

[0059] The second planetary gear mechanism 52 includes a sun gear S2, a plurality of planet gears P2 meshing with the sun gear S2, a planet carrier C2 supporting the planet gears P2, and a ring gear R2 meshing with the planet gears P2. Regarding the second planetary gear mechanism 52, besides… Figure 1 In addition, refer to Figure 2 and Figure 3 Please provide an explanation.

[0060] For example, planetary gear P2 has three (see reference). Figure 3Each planetary gear P2 is a second-stage pinion comprising a rotating shaft 52a parallel to the rotor shaft 4, and a small-diameter pinion (hereinafter referred to as small-diameter gear 54) and a large-diameter pinion (hereinafter referred to as large-diameter gear 55) capable of rotating around the rotating shaft 52a. Figure 2 As shown, the small-diameter gear 54 and the large-diameter gear 55 are integrally formed and rotate as a whole. The small-diameter gear 54 is disposed on the first end side and meshes with the sun gear S2, while the large-diameter gear 55 is disposed on the second end side and meshes with the gear ring R2.

[0061] The planet carrier C2 is connected to the end of the rotating shaft 52a, supporting the planetary gear P2. In the following description, the connection portion of the planet carrier C2 that connects to the rotating shaft 52a will also be specifically referred to as the shaft support portion 57 (see reference). Figure 2 The planetary carrier C2 is configured to be able to rotate in a first state, fixed relative to the unit housing 2 and unable to rotate, via a clutch (not shown) Figure 1 The planetary gear P2 transitions between a first state and a second state (not shown) in which it can rotate. In the first state, the planetary gear P2 does not revolve around the sun gear S2. On the other hand, in the second state, the planetary gear P2 revolves around the sun gear S2.

[0062] A gear section is provided on the inner circumferential surface of the gear ring R2 for meshing with the large-diameter gear 55 of the planetary gear P2. In addition, the gear ring R2 is connected to the output shaft 12 and rotates integrally with the output shaft 12.

[0063] According to the reduction mechanism 5 described above, when the planetary carrier C2 is in the first state where it cannot rotate, when the motor 3 is driven, the driving force of the motor 3 is reduced by the reduction mechanism 5 and output from the output shafts 11 and 12.

[0064] like Figure 2 and Figure 3 As shown, the unit housing 2 stores oil (an example of a liquid medium) for cooling and / or lubrication. Figure 2 and Figure 3 The thick dashed line in the figure represents the oil level. The oil is stored to a level that can immerse the gear ring R2 and the large-diameter gear 55, and the rotation of the gear ring R2 and the large-diameter gear 55 raises the oil.

[0065] The electric drive unit 1 also includes a fluid guiding section 60, which is disposed above the reduction mechanism 5 to guide the oil that is thrown up to the reduction mechanism 5. In this embodiment, the fluid guiding section 60 specifically guides the oil to the second planetary gear mechanism 52 of the reduction mechanism 5. Figure 2 The dashed arrows in the diagram indicate the flow of oil guided by the fluid guide section 60.

[0066] like Figures 2-4As shown, the liquid guiding portion 60 is formed on the upper portion of the ring member 6 disposed on the inner circumferential side of the unit housing 2. The ring member 6 is disposed radially outward of the second planetary gear mechanism 52 and is provided around the second planetary gear mechanism 52 with a gap. The liquid guiding portion 60 is a plate-shaped member extending along the axial direction of the rotation axis 52a. In this embodiment, the liquid guiding portion 60 is formed on the ring member 6, and therefore has a shape that is curved circumferentially along the ring member 6.

[0067] like Figure 2 As shown, the fluid guiding portion 60, when viewed radially from the rotation axis 52a of each planetary gear P2, is positioned to overlap with the large-diameter gear 55 and the small-diameter gear 54. Specifically, the fluid guiding portion 60 includes: a first fluid guiding portion 61, which overlaps with the large-diameter gear 55 when viewed radially; a second fluid guiding portion 62, which overlaps with the small-diameter gear 54 when viewed radially; and a third fluid guiding portion 63, which partially overlaps with the area between the large-diameter gear 55 and the small-diameter gear 54 when viewed radially, and connects the first fluid guiding portion 61 and the second fluid guiding portion 62. In other words, when viewed from above, the first fluid guiding portion 61 overlaps with the large-diameter gear 55, the second fluid guiding portion 62 overlaps with the small-diameter gear 54, and the third fluid guiding portion 63 partially overlaps with the area between the large-diameter gear 55 and the small-diameter gear 54.

[0068] The first liquid guiding portion 61 and the second liquid guiding portion 62 extend parallel to the axial direction, and the third liquid guiding portion 63 extends perpendicular to the axial direction. However, the first liquid guiding portion 61 and the second liquid guiding portion 62 may also be inclined relative to the axial direction. For example, the first liquid guiding portion 61 and the second liquid guiding portion 62 may also be inclined downward towards the first end. In addition, the third liquid guiding portion 63 may also be inclined relative to the axial direction instead of being perpendicular.

[0069] like Figure 3 and Figure 4 As shown, the fluid guiding section 60 is provided with a cutout 64 formed by cutting off a portion of the first fluid guiding section 61 and the third fluid guiding section 63 along the circumference of the ring member 6. At least a portion of each planetary gear P2 is disposed between the two ends 64a and 64b of the cutout 64 when viewed from above.

[0070] like Figure 2 As shown, the end portion 60b of the fluid guiding section 60 on the second end side in the axial direction is positioned to overlap with the large-diameter gear 55 when viewed radially, and the end portion 60a of the fluid guiding section 60 on the first end side in the axial direction is positioned to overlap with the shaft support portion 57 of the planetary carrier C2 when viewed radially. Here, the end portion 60b of the fluid guiding section 60 is the portion located in the first fluid guiding section 61, and the end portion 60a of the fluid guiding section 60 is the portion located in the second fluid guiding section 62.

[0071] According to the fluid guiding section 60, the oil stirred up by the gear ring R2 and the large-diameter gear 55 is supplied to the small-diameter gear 54 and the shaft support section 57 of the planetary carrier C2 via the fluid guiding section 60. Specifically, the oil is supplied to the small-diameter gear 54 and the shaft support section 57 along the planetary gear P2 side surface (i.e., the lower surface) of the first fluid guiding section 61, the third fluid guiding section 63, and the second fluid guiding section 62. In addition, the oil is also supplied to the shaft support section 57 from the cut-out section 64 along the unit housing 2 side surface (i.e., the upper surface) of the second fluid guiding section 62. Even in a structure where the small-diameter gear 54 does not stir up the oil stored in the unit housing 2, the fluid guiding section 60 enables good cooling and / or lubrication of the small-diameter gear 54 and the shaft support section 57.

[0072] Furthermore, the end portion 60b on the second end side of the fluid guide 60 is positioned to overlap with the gear ring R2 when viewed radially. Therefore, even in the aforementioned first state where the planetary gear P2 does not revolve, the fluid guide 60 can receive the oil stirred up by the gear ring R2 and supply it to the small diameter gear 54 and the shaft support portion 57.

[0073] The second fluid guide portion 62 is positioned closer to the rotating shaft 52a than the first fluid guide portion 61. In this configuration, the second fluid guide portion 62 is spaced apart from the unit housing 2 radially from the rotating shaft 52a. With this structure, compared to the case where the distance between the second fluid guide portion 62 and the rotating shaft 52a is equal to the distance between the first fluid guide portion 61 and the rotating shaft 52a, it is easier to efficiently supply oil to the shaft support portion 57.

[0074] Of the first angle formed by the first liquid guiding portion 61 and the rotating shaft 52a, the second angle formed by the second liquid guiding portion 62 and the rotating shaft 52a, and the third angle formed by the third liquid guiding portion 63 and the rotating shaft 52a, the third angle is the largest. Specifically, in this embodiment, the first liquid guiding portion 61 and the second liquid guiding portion 62 are arranged parallel to the rotating shaft 52a, and the first and second angles are 0 degrees. On the other hand, the third liquid guiding portion 63 is arranged perpendicular to the rotating shaft 52a, and the third angle is 90 degrees, which is the largest. With this structure, oil can easily drip from the third liquid guiding portion 63, and oil can be efficiently supplied between the large-diameter gear 55 and the small-diameter gear 54. Furthermore, in this embodiment, an example of the first and second angles being 0 degrees and the third angle being 90 degrees has been described, but it is not limited to this; the first and / or second angles can be greater than 0 degrees, and the third angle can be less than 90 degrees.

[0075] The second liquid guiding section 62 has a plurality of connecting sections 65 that connect the radially outer side and the inner side. For example, Figure 4As shown, the connecting portion 65 is configured with multiple slits formed at the end 60a. Oil introduced from the slits 64 to the upper surface of the second fluid guiding portion 62 drips from the connecting portion 65 (see reference). Figure 3 (dashed arrow).

[0076] In this embodiment, such as Figure 2 As shown, the connecting portion 65, when viewed radially, is positioned at a point that partially overlaps with the small-diameter gear 54 and the shaft support portion 57. Therefore, oil introduced to the upper surface of the second fluid guiding portion 62 can be supplied through the connecting portion 65 to the portion between the small-diameter gear 54 and the shaft support portion 57.

[0077] Figure 5 This is a perspective view of the fluid-conducting portion 60 having the connecting portion 65 of the first modified example. The connecting portion 65 of the first modified example and... Figure 4 Similar to the fluid guiding section 60 shown, it is configured with multiple cutouts formed at the end 60a, but is formed as a strip in the axial direction. In the first modified example, the connecting section 65 is positioned overlapping the small-diameter gear 54 when viewed radially, and is also positioned partially overlapping the area between the small-diameter gear 54 and the shaft support 57 when viewed radially. Therefore, oil introduced to the upper surface of the second fluid guiding section 62 can be supplied to the small-diameter gear 54 and the area between the small-diameter gear 54 and the shaft support 57 through the connecting section 65.

[0078] Figure 6 This is a perspective view of the fluid guiding portion 60 with the connecting portion 65 of the second modified example. The connecting portion 65 of the second modified example is configured as a through hole formed in the second fluid guiding portion 62. In the illustrated example, three through holes are provided. The connecting portion 65 of the second modified example is positioned overlapping the small-diameter gear 54 when viewed radially. Therefore, oil introduced to the upper surface of the second fluid guiding portion 62 can be supplied to the small-diameter gear 54 through the connecting portion 65.

[0079] like Figure 3 As shown, a cutout 64 and a connecting portion 65 are always positioned above each planetary gear P2. Therefore, regardless of the position of the planetary gear P2 revolving around the sun gear S2, oil can be appropriately supplied to the planetary gear P2.

[0080] like Figures 3-6As shown, the liquid guiding section 60 has a protrusion 66 provided on the upper surface of the second liquid guiding section 62 and protruding toward the unit housing 2. The protrusion 66 forms a storage section 67 capable of storing oil stirred up by the gear ring R2 and the large-diameter gear 55. Specifically, the storage section 67 is formed by dividing the upper surface of the second liquid guiding section 62, the protrusion 66, and the third liquid guiding section 63. Oil can also be stored in the liquid guiding section 60, thus lowering the oil level at the bottom of the unit housing 2. Therefore, the stirring resistance when the large-diameter gear 55 rotates can be reduced.

[0081] The protrusion 66 preferably contacts the unit housing 2. As a result, the degree of closure of the storage section 67 is increased, which can improve the storage performance of the storage section 67.

[0082] The present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to this embodiment. It is obvious that those skilled in the art will conceive of various modifications or alterations within the scope of the technical solution described, and it should be understood that these modifications and alterations also fall within the technical scope of the present invention. Furthermore, the constituent elements of the above embodiments can be combined arbitrarily without departing from the spirit of the invention.

[0083] For example, in the aforementioned embodiment, the liquid guiding portion 60 is formed on the ring member 6, but it is not limited thereto. For example, the liquid guiding portion 60 may be formed on the unit housing 2, or it may be formed on other components.

[0084] In addition, in the aforementioned embodiment, the cut portion 64 provided on the liquid guiding portion 60 is formed by cutting the first liquid guiding portion 61 and the third liquid guiding portion 63, but it is not limited to this, and it may also be formed by cutting only the first liquid guiding portion 61.

[0085] At least the following items are described in this specification. The elements shown in parentheses are examples of components corresponding to the above embodiments, but the invention is not limited thereto.

[0086] (1) An electric drive unit (electric drive unit 1), comprising:

[0087] Electric motor (electric motor 3);

[0088] The reduction mechanism (reduction mechanism 5) includes a rotating shaft (rotating shaft 52a), a large-diameter gear (large-diameter gear 55) and a small-diameter gear (small-diameter gear 54) that rotate integrally around the rotating shaft, and a shaft support portion (shaft support portion 57) disposed at the end of the rotating shaft and supporting the rotating shaft; and

[0089] The unit housing (unit housing 2) houses the motor and the reduction mechanism.

[0090] The electric drive unit transmits the rotation of the motor's rotor shaft (rotor shaft 4) to the output shaft (output shaft 11, 12) via the reduction mechanism.

[0091] in,

[0092] The unit housing contains a liquid medium for cooling and / or lubrication, which is at least lifted by the large-diameter gear.

[0093] The electric drive unit also includes a liquid guiding section (liquid guiding section 60), which is disposed above the reduction mechanism and is used to guide the liquid medium to the reduction mechanism.

[0094] When viewed radially from the rotating shaft, the fluid guiding portion is positioned to overlap with the large-diameter gear, the small-diameter gear, and the shaft support portion.

[0095] The fluid guiding portion is positioned at one end (end 60b) along the axis of the rotating shaft, when viewed radially, at a position overlapping with the large-diameter gear.

[0096] The other end (end 60a) of the liquid guiding portion in the axial direction is positioned to overlap with the shaft support portion when viewed from the radial direction.

[0097] According to (1), when viewed radially, one end of the liquid guide portion is positioned to overlap with the large-diameter gear, and the other end of the liquid guide portion is positioned to overlap with the shaft support portion. Therefore, the liquid medium that is lifted by the large-diameter gear can be supplied to the shaft support portion via the liquid guide portion. In addition, even in a structure where the small-diameter gear does not lift the liquid medium stored in the unit housing, cooling and / or lubrication of the small-diameter gear can be achieved through the liquid guide portion that overlaps with the small-diameter gear when viewed radially.

[0098] (2) The electric drive unit according to (1), wherein,

[0099] The liquid guiding part includes:

[0100] The first liquid guiding section (first liquid guiding section 61) overlaps with the large-diameter gear when viewed from the radial direction;

[0101] The second liquid guiding section (second liquid guiding section 62) overlaps with the small-diameter gear when viewed from the radial direction; and

[0102] The third liquid guiding section (third liquid guiding section 63) connects the first liquid guiding section and the second liquid guiding section.

[0103] The second liquid guiding part is positioned closer to the rotation axis than the first liquid guiding part.

[0104] According to (2), since the second liquid guiding part is located closer to the rotating shaft than the first liquid guiding part, the liquid medium can be efficiently supplied from the first liquid guiding part to the shaft support part along the second liquid guiding part.

[0105] (3) The electric drive unit according to (2), wherein,

[0106] The third fluid guiding part is disposed between the large-diameter gear and the small-diameter gear in the axial direction.

[0107] Among the first angle formed by the first liquid guiding part and the rotating axis, the second angle formed by the second liquid guiding part and the rotating axis, and the third angle formed by the third liquid guiding part and the rotating axis, the third angle is the largest.

[0108] According to (3), the liquid medium is more likely to drip from the third liquid guide section, and the liquid medium can also be efficiently supplied between the large-diameter gear and the small-diameter gear.

[0109] (4) The electric drive unit according to any one of (1) to (3), wherein,

[0110] At least a portion of the liquid guiding section is disposed separately from the unit housing in the radial direction of the rotating shaft.

[0111] The liquid guiding part has a connecting part (connecting part 65) that connects the radial outer side and the inner side.

[0112] The connecting portion is disposed at least on one of the following locations: one where it overlaps with the small-diameter gear when viewed from the radial direction, and another where it partially overlaps with the small-diameter gear and the shaft support when viewed from the radial direction.

[0113] According to (4), the liquid medium entering between the unit housing and the liquid guiding part can be supplied to the small diameter gear and / or the small diameter gear and the shaft support part through the connecting part.

[0114] (5) The electric drive unit according to any one of (1) to (4), wherein,

[0115] At least a portion of the liquid guiding section is disposed separately from the unit housing in the radial direction of the rotating shaft.

[0116] The liquid guiding part has a protrusion (protrusion 66) that protrudes toward the unit housing to form a storage part (storage part 67) capable of storing the liquid medium.

[0117] According to (5), since the storage section formed in the liquid guiding part stores the liquid medium, the liquid level of the liquid medium stored at the bottom of the unit housing can be reduced. Therefore, the stirring resistance of the gear of the reduction mechanism can be reduced.

[0118] (6) The electric drive unit according to (5), wherein,

[0119] The protrusion contacts the unit housing.

[0120] According to (6), the storage performance of the storage section can be improved.

Claims

1. An electric drive unit comprising: Electric motor; A speed reduction mechanism includes a rotating shaft, a large-diameter gear and a small-diameter gear that rotate integrally around the rotating shaft, and a shaft support portion disposed at the end of the rotating shaft and supporting the rotating shaft; and The unit housing houses the electric motor and the reduction gear mechanism. The electric drive unit transmits the rotation of the motor's rotor shaft to the output shaft via the reduction mechanism. in, The unit housing contains a liquid medium for cooling and / or lubrication, which is at least lifted by the large-diameter gear. The electric drive unit also includes a liquid guiding section, which is disposed above the reduction mechanism and is used to guide the liquid medium to the reduction mechanism. When viewed radially from the rotating shaft, the fluid guiding portion is positioned to overlap with the large-diameter gear, the small-diameter gear, and the shaft support portion. One end of the fluid guiding portion, when viewed radially, is positioned to overlap with the large-diameter gear. The other end of the liquid guiding portion in the axial direction is positioned to overlap with the shaft support portion when viewed from the radial direction.

2. The electric drive unit according to claim 1, wherein, The liquid guiding part includes: The first liquid guiding section overlaps with the large-diameter gear when viewed from the radial direction; The second fluid guiding section overlaps with the small-diameter gear when viewed from the radial direction; and The third liquid guiding section connects the first liquid guiding section and the second liquid guiding section. The second liquid guiding part is positioned closer to the rotation axis than the first liquid guiding part.

3. The electric drive unit according to claim 2, wherein, The third fluid guiding part is disposed between the large-diameter gear and the small-diameter gear in the axial direction. Among the first angle formed by the first liquid guiding part and the rotating axis, the second angle formed by the second liquid guiding part and the rotating axis, and the third angle formed by the third liquid guiding part and the rotating axis, the third angle is the largest.

4. The electric drive unit according to any one of claims 1 to 3, wherein, At least a portion of the liquid guiding section is disposed separately from the unit housing in the radial direction of the rotating shaft. The liquid guiding part has a connecting part that connects the radial outer side and the inner side. The connecting portion is disposed at least on one of the following locations: one where it overlaps with the small-diameter gear when viewed from the radial direction, and another where it partially overlaps with the small-diameter gear and the shaft support when viewed from the radial direction.

5. The electric drive unit according to any one of claims 1 to 3, wherein, At least a portion of the liquid guiding section is disposed separately from the unit housing in the radial direction of the rotating shaft. The liquid guiding part has a protrusion that protrudes toward the unit housing, forming a storage part capable of storing the liquid medium.

6. The electric drive unit according to claim 5, wherein, The protrusion contacts the unit housing.

Images