Electric drive for driving a motor vehicle

Abstract

The invention relates to an electric drive for driving a motor vehicle, comprising: an electric motor; a transmission device; and a housing containing a lubricant therein and having an intermediate wall which delimits a transmission space in which the transmission is arranged and a motor space in which the motor is arranged; wherein the intermediate wall has a first passage, which establishes a fluid connection between the motor space and the transmission space, and wherein the intermediate wall has a second passage, which establishes a fluid connection between the motor space and the transmission space, and wherein a valve with a closing element is provided, which valve can be switched into a blocking position, in which the fluid connection between the motor space and the transmission space is blocked, and a release position, in which the fluid connection between the motor space and the transmission space is released, wherein the first passage comprises a guide section, in which the closure element is guided, and the guide section extends at an angle to the horizontal line in a desired installation position of the electric drive.

Description

Technical Field

[0001] The invention relates to an electric drive device for driving a motor vehicle. Background Art

[0002] The electric drive converts the electrical energy of the energy storage device into rotational energy to drive the vehicle wheels. The rotating parts of the electric drive, such as components of the motor or components of the integrated transmission, and the associated bearings must be adequately supplied with lubricant to ensure their function over a long period of time during operation. In addition, the distribution of the lubricant in the transmission also enables the removal of excess heat energy. In contrast, the entry of lubricant into the air gap of the motor of the electric drive can lead to severe efficiency losses.

[0003] DE 10 2014 204 088 A1 discloses a transmission with a transmission housing. The transmission housing has a first section and a second section, wherein an electric motor is arranged in the first section and a transmission is arranged in the second section. An intermediate plate delimits the first section and the second section. A channel establishes a fluid connection between the first section and the second section of the housing. A flip member is arranged in the channel, which is fixed by a hinge. The flip member is arranged here so that when oil flows from the first section to the second section, the flip member moves away from the stop member and thus releases the channel. When oil flows from the second section to the first section, the flip member is pressed against the stop member by the oil flow, thereby closing the channel.

[0004] An electric drive device for driving a motor vehicle is known from WO 2019 / 228639 A1, which comprises: a housing assembly with a motor space, in which a motor is accommodated, and a transmission space, in which a transmission connected to the motor drive is arranged. The motor space and the transmission space are fluid-sealed from each other by a radial shaft sealing ring close to the motor shaft, so that lubricant cannot enter the motor space from the transmission space. This has the disadvantage that as the wear of the radial shaft sealing ring increases, lubricant can enter the motor space from the transmission space as an undesired leakage, which can accumulate in the motor space for a long time and enter the air gap of the motor. Summary of the invention

[0005] Starting from this, the object of the present invention is to provide an electric drive for driving a motor vehicle which ensures a constant efficiency of the electric drive over the entire operating period.

[0006] To achieve this object, an electric drive device for driving a motor vehicle is proposed, the electric drive device comprising: an electric motor; a motor shaft, which can be driven by the electric motor to rotate around a drive shaft; a transmission device, which is drivingly connected to the motor shaft; and a housing, in which a lubricant is contained, and the housing has an intermediate wall, which limits a transmission space in which the transmission device is arranged and a motor space in which the motor is arranged; wherein the intermediate wall has a first through-hole, which establishes a fluid connection between the motor space and the transmission space; and wherein a valve with a closing element is provided, which valve can be switched into a blocking position in which the fluid connection between the motor space and the transmission space is blocked and a release position in which the fluid connection between the motor space and the transmission space is released, wherein the first through-hole includes a guide section in which the closing element is guided, and the guide section extends obliquely to the horizontal line in the rated installation position of the electric drive device.

[0007] A nominal installation position is to be understood as a position of the electric drive which is obtained when the electric drive is installed in its nominal position in the vehicle and the vehicle lies on a horizontal surface with the wheels immobile.

[0008] The lubricant level in the transmission space drops as the transmission is run, and the hydraulic pressure acting on the closing element from the transmission space side by the lubricant decreases until the closing element moves out of the blocking position due to the sum of the hydraulic pressure on the motor space side and gravity.

[0009] The electric drive device of the present invention has the following advantages: by arranging the closing element in the inclined guide channel, a self-switching valve is provided by gravity and buoyancy. Therefore, a compact design is achieved for the electric drive device according to the present invention while using a small number of components.

[0010] In a possible embodiment of the electric drive, the motor shaft can extend through the second aperture of the intermediate wall, so that lubricant can enter the motor space from the gear space through the gap between the motor shaft and the intermediate wall.

[0011] In another possible embodiment of the electric drive, the motor shaft can be connected to the rotor of the electric motor. In the rated installation position and while the motor shaft is stationary without being driven, the lubricant can form a lubricant surface in the transmission space, which defines a stationary lubricant plane. At least one gear of the transmission can be immersed in the lubricant. The electric motor can also have an air gap formed between the stator and the rotor. The deepest peripheral section of the air gap can be located below the lubricant plane. In other words, the air gap can extend in the vertical direction through the stationary lubricant plane.

[0012] In a possible design, the first through-portion has a motor space access portion opened in the direction of the motor space and a transmission space access portion opened in the direction of the transmission space. In the rated installation position, the motor space access portion can be arranged in the vertical direction to be lower than the vertically deepest peripheral section of the air gap. Alternatively or in combination, in the rated installation position, the motor space access portion is arranged vertically to be higher than the transmission space access portion. In the rated installation position and when the motor shaft is stationary without being driven, the transmission space access portion can be arranged below the stationary lubricant plane. In the rated installation position and when the motor shaft is driven, the transmission space access portion can be arranged at least partially above the running lubricant plane, and / or the motor space access portion can be arranged above the running lubricant plane.

[0013] In a possible embodiment of the electric drive, the fluid connection between the motor space and the transmission space via the first through-hole can be selectively released and blocked. The valve can be self-switching in particular. Alternatively, the valve can be actuable, in particular actuable by an electromagnetic device.

[0014] In another possible embodiment of the electric drive, the valve can include a closure element designed as a ball. Alternatively, the closure element can have a spherical section. The closure element can be movably arranged in the first through-hole. The closure element can only contact the inner wall of the first through-hole and the lubricant in the blocking position. In particular, the closure element can be made of rubber.

[0015] A further alternative embodiment is to design the closure element as a tilting element which is pivotably fastened to the housing, so that the gear mechanism space access can be selectively released and blocked by the tilting element.

[0016] The closure element can have a lower density than the lubricant. Thus, in the nominal installation position and while the motor shaft is at rest without being driven, the closure element is loaded by the lubricant with a buoyancy force in the direction of the blocking position, in which the fluid connection between the motor space and the transmission space via the first leadthrough is blocked. If the closure element has a lower density than the lubricant, then in the nominal installation position the motor space opening can be arranged vertically deeper than the transmission space opening.

[0017] Alternatively, the closing element can have a higher density than the lubricant. Thus, in the nominal installation position and while the motor shaft is at rest without being driven, the closing element is loaded by the lubricant with a buoyancy force that is less than the weight of the closing element, so that the closing element is loaded in the direction of the blocking position, in which the fluid connection between the motor space and the transmission space via the first feedthrough is blocked. If the closing element has a higher density than the lubricant, then in the nominal installation position the motor space opening can be arranged vertically higher than the transmission space opening.

[0018] In another possible embodiment, the first aperture may extend obliquely to the vertical line.

[0019] In a possible embodiment, the cross section of the first through-hole can be defined by a first maximum inscribed circle in the region of the guide section, and the cross section of the first through-hole can be defined by a second maximum inscribed circle in the second region, which can also be referred to as a blocking section. The first maximum inscribed circle can have a diameter greater than the diameter of the second maximum inscribed circle. In other words, the first through-hole can be implemented in a stepped shape.

[0020] The region of the guide section can be located closer to the transmission space than the second region.

[0021] In another possible embodiment, a stop can be arranged in the transmission space, against which the closure element bears in a release position of the valve, in which the fluid connection between the motor space and the transmission space is released via the first passage.

[0022] In another possible embodiment, a fluid throttling device can be arranged in the second through-hole. The fluid throttling device reduces the flow through the second through-hole, but cannot completely prevent the flow. For example, the fluid throttling device can be a non-contact seal, which is arranged in particular between the motor shaft and the second through-hole. In particular, annular gap seals and labyrinth seals are conceivable as non-contact seals.

[0023] In the rated installation position, in one possible embodiment, the vertically deepest toothed section of the transmission can be vertically higher than the vertically deepest peripheral section of the air gap. Alternatively or in combination, in the rated installation position, the vertically deepest toothed section of the transmission can be vertically higher than the motor chamber opening of the first feedthrough.

[0024] In another possible embodiment, the motor shaft may have a pinion section, a through section and a bearing section located therebetween. The pinion section may be arranged in the transmission space and have a maximum pinion diameter. The through section may be arranged in the second through-section of the intermediate wall and have a maximum through-section diameter. The bearing section may accommodate a bearing for rotatably supporting the motor shaft relative to the intermediate wall and have a maximum bearing section diameter. The maximum pinion diameter may be less than or equal to the maximum bearing section diameter. Alternatively or in combination, the maximum pinion diameter may be less than or equal to the maximum through-section diameter. The maximum bearing section diameter may be less than or equal to the maximum through-section diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] A possible embodiment of the electric drive according to the invention will be explained below with reference to the accompanying drawings.

[0026] Figure 1 A longitudinal section through an electric drive for a vehicle according to an embodiment of the invention is shown, wherein the electric drive is shown in a nominal installation position in the vehicle;

[0027] Figure 2 show Figure 1 A detailed view of a first aperture in the intermediate wall of the electric drive in FIG. 1 , wherein the motor shaft is stationary without being driven and the closing element is in the blocking position;

[0028] Figure 3 show Figure 1 A detailed view of a first aperture in the intermediate wall of the electric drive in FIG. 1 , wherein the motor shaft is rotationally driven and the closure element is in the released position; and

[0029] Figure 4 show Figure 1 Detailed view of the second aperture in the intermediate wall of the electric drive in FIG. DETAILED DESCRIPTION

[0030] The following commonly described Figures 1 to 4An electric drive device 1 for driving a vehicle according to the present invention is shown. The electric drive device 1 includes an electric motor 19 having a rotor 20 and a stator 21 that can rotate around a rotor axis L20. An air gap 22 is formed between the rotor 20 and the stator 21, and the air gap 22 surrounds the rotor axis L20 in a cylindrical shape at least in sections. The electric drive device 1 also includes a motor shaft 23, which is connected to the rotor 20 in a rotationally fixed manner so that the motor shaft 23 can be driven by the electric motor 19 to rotate around a drive axis L23. The drive axis L23 and the rotor axis L20 are arranged coaxially relative to each other.

[0031] The motor shaft 23 is in driving connection with a transmission 27. The transmission 27 is designed to convert the rotational speed of the electric motor 19 into the rotational speed of the vehicle wheels. The transmission 27 currently comprises a spur gear transmission 28 with one or more spur gear transmission stages and a differential 29 with a ring wheel 30, which is connected to a differential case 31 and engages with the spur gear transmission 28. The ring wheel 30 rotates here about a rotation axis L29, which in this case is arranged coaxially with the drive shaft L23, but is not limited to this. In a manner known to those skilled in the art, the differential 29 can distribute the power transmitted from the spur gear transmission 28 to the ring wheel 30 to the two wheels of the vehicle.

[0032] The electric drive 1 further comprises a housing 2 which has a motor housing element 6 and a transmission housing element 18 which are connected to one another via an intermediate plate 17 .

[0033] The motor housing element 6 is designed in a pot shape and has an opening on a first side, which is closed by a motor cover 5. The motor housing element 6 and the motor cover 5 delimit a motor space 3 in which the motor 19 and a section of the motor shaft 23 are arranged. A cooling channel 39 is formed between the motor cover 5 and the motor housing element 6, in which a coolant circulates to cool the motor 19. Therefore, the electric drive device 1 includes a fluid-cooled motor.

[0034] The bottom section of the pot-shaped motor housing element 6, which can also be referred to as the intermediate wall 7, has a first through-hole 12 and a second through-hole 8. The motor shaft 23 extends through the second through-hole 8. The motor shaft 23 is rotatably supported around the drive axis L23 in the motor cover 5 with a motor cover bearing 37 and in the intermediate wall 7 with an intermediate wall bearing 38.

[0035] The motor housing element 6 and the transmission housing element 18 are connected to one another via the intermediate plate 17 in such a way that a transmission space 4 is formed between the motor housing element 6 and the transmission housing element 18. A transmission 27 with a spur gear 28 and a differential 29 as well as a section of the motor shaft 23 are accommodated in the transmission space 4. The intermediate plate 17 supports the bearings of the spur gear 28 and the differential 29.

[0036] A lubricant 32 for lubricating the components of the electric drive 1 is contained in the housing 2. In the nominal installation position of the electric drive 1 in the vehicle, in which the vehicle is located on a horizontal surface and the motor shaft 23 is stationary without being driven, the lubricant 32 forms a lubricant surface 33, such as Figure 3 33. A stationary lubricant plane ES1, which can also be referred to as a stationary lubricant level, is defined by the lubricant surface 33. The air gap 22 of the electric machine 19 extends through the stationary lubricant plane ES1. In other words, the stationary lubricant plane ES1 is arranged vertically above the vertically deepest peripheral section of the air gap 22.

[0037] The motor shaft 23 has a through section 25, which is arranged in the second through-hole 8. In other words, the through section 25 is arranged radially overlapping with the section of the intermediate wall 7 relative to the drive shaft L23, and the section of the intermediate wall 7 limits the second through-hole 8. The section of the intermediate wall 7 that limits the second through-hole 8 can also be called the throttle section 11. The through section 25 and the second through-hole 8 are each designed to be cylindrical in sections, so that an annular gap 9 is currently formed between the motor shaft 23 and the intermediate wall 7. The lubricant 32 can enter the motor space 3 from the transmission space 4 through the gap 9. Due to the rotation of the through section 25 of the motor shaft 23 and the throttle section 11 of the intermediate wall 7 relative to each other, the gap 9 forms a non-contact gap seal with leakage characteristics.

[0038] It is also conceivable that the through-section 25 and the second through-section 8 partially have a shape that deviates from the cylindrical shape. In particular, an alternative non-contact seal, such as a conical gap seal or a labyrinth seal, can be formed by the through-section 25 and the second through-section 8. The non-contact seal can act as a fluid throttling device to reduce the volume that can pass through the gap 9, but cannot completely prevent the lubricant 32 from escaping through the gap 9. It is understood that the gap 9 can also be designed in such a way that it has no sealing effect at all.

[0039] Due to the contactless arrangement of the motor shaft 23 in the second lead-through 8, the diameter D25 of the through-section 25 can be designed to be larger than in the case of a seal between the through-section 25 and the intermediate wall 7 which contacts the through-section 25. Due to the larger diameter D25 of the through-section 25, in the case of a contact seal, the contact surface / sealing surface of the seal would wear more quickly due to the greater peripheral speeds on the surface of the through-section 25.

[0040] The motor shaft 23 has a bearing section 26, which adjoins the through section 25 in the axial direction. The bearing section 26 is cylindrical and has a diameter D26. An intermediate wall bearing 38 with an inner ring is arranged on the bearing section 26. The intermediate wall bearing 38 is supported by an outer ring in the bearing receiving section 10 of the intermediate wall 7.

[0041] The motor shaft 23 further has a toothed pinion section 24, which adjoins the bearing section 26 in the axial direction. The toothing of the pinion section 24 engages with the toothing of a transmission 27 or a spur gear 28, so that the power transmitted from the electric motor 19 to the motor shaft 23 can be transmitted from the pinion section 24 to the transmission 27. The pinion section 24 has a diameter D24, which is determined by the tip circle diameter of the toothing of the pinion section 24.

[0042] The achievable diameter D24 of the pinion section 24 is limited by the diameter D8 of the largest cylinder inscribed in the second aperture 8, which is arranged coaxially with the drive shaft L23, so that the motor shaft 23 can be pushed through the second aperture 8 during assembly. Due to the contactless arrangement of the through-section 25 of the motor shaft 23 and the intermediate wall 7, the diameter D25 of the through-section 25 and the diameter D8 of the largest cylinder inscribed in the second aperture 8 can be increased. This in turn leads to the fact that the diameter D24 of the pinion section 24 can also be increased. This results in a far-reaching new degree of design freedom for the electric drive 1, by which, for example, the transmission ratio of the transmission 27 can be advantageously adapted to different applications of the electric drive 1 or the toothing can be optimized with regard to durability or NVH performance.

[0043] In the present case, the diameter D26 of the bearing section 26 is smaller than the diameter D25 of the through-section 25 . In the present case, the diameter D24 of the pinion section 24 is smaller than the diameter D26 of the bearing section 26 .

[0044] The intermediate wall 7 has a first through-hole 12 in the following area, which is deeper than the second through-hole 8 in the vertical direction in the rated installation position of the electric drive 1. The first through-hole 12 connects the motor space 3 with the transmission space 4 in terms of fluid. In the rated installation position of the electric drive 1, the first through-hole 12 is oriented transversely to the horizontal line. The first through-hole 12 includes a motor space access 15 opened in the direction of the motor space 3 and a transmission space access 16 opened in the direction of the transmission space 4. In the rated installation position of the electric drive 1, the motor space access 15 is arranged vertically higher than the transmission space access 16. Thus, when the oil level in the motor space 3 rises to the height of the motor space access 15, the lubricant 32 that enters the motor space 3 via the second through-hole 8 can flow back into the transmission space 4 again through the first through-hole 12.

[0045] In the rated installation position of the electric drive 1, the motor space opening 15 is arranged vertically deeper than the air gap 22 of the electric motor 19. This arrangement of the motor space opening 15 in the intermediate wall 7 ensures that the lubricant 32 that escapes into the motor space 3 through the second aperture 8 cannot accumulate in the air gap 22. This would lead to a significant reduction in the efficiency of the electric motor 19 and is therefore undesirable.

[0046] Here, the motor space opening 15 is arranged axially offset relative to the drive shaft L23 and the air gap 22. However, it is also conceivable that the motor space opening 15 is arranged radially overlapping relative to the drive shaft L23 and the air gap 22. In other words, in the rated installation position of the electric drive device 1, the motor space opening 15 can be arranged vertically below the air gap 22.

[0047] The first through-hole 12 has a guide section 13 and a stop section 14. In the present case, the guide section 13 and the stop section 14 are designed as cylindrical and transition into each other via a conical section of the first through-hole 12. The diameter of the guide section 13 is greater than the diameter of the stop section 14. In principle, it is also conceivable that the guide section 13 and the stop section 14 have a shape that deviates from a cylindrical shape. In particular, the guide section 13 and the stop section 14 can be designed as a cone, in particular a truncated cone.

[0048] The guide section 13i is arranged obliquely to the horizontal line. A closing element 35 is movably arranged in the guide section 13. The closing element 35 can be switched to a blocking position and a release position. In the blocking position, the closing element 35 blocks the fluid connection between the motor space 3 and the transmission space 4 through the first through-hole 12; in the release position, the closing element 35 releases the fluid connection between the motor space 3 and the transmission space 4 via the first through-hole 12.

[0049] In the blocking position, the closing element 35 is acted upon with a force in the direction of the blocking section 14 . The closing element 35 then comes to bear against the blocking section 14 and seals it off relative to the guide section 13 .

[0050] Here, the closing element 35 is designed as a rubber ball. The closing element 35 has a lower density than the lubricant 32. If, in the rated installation position of the electric drive 1, the lubricant plane E_S in the transmission space 4 is vertically higher than the position of the closing element 35, the closing element 35 is subjected to a buoyancy force from the lubricant 32, which loads the closing element 35 in the direction of the blocking section 14. This occurs, for example, when the motor shaft 23 is stationary without being driven and the lubricant plane E_S corresponds to the stationary lubricant plane ES1, as in Figure 3 This is the case as shown in . Therefore, in the nominal installation position and the non-driven state of the electric drive device 1, the closing element 35 is arranged in the blocking position.

[0051] The wheel of the transmission 27 is rotated by driving the electric motor 19. The wheel of the transmission 27 distributes the lubricant 32 into the transmission space 4 by its rotation, and the wheel of the transmission 27 extends through the stationary lubricant plane ES1 or is arranged with a peripheral section in the lubricant 32. In the present case, in the rated installation position of the electric drive 1 without driving the motor shaft 32, the ring wheel 30 of the differential 29 passes through the stationary lubricant plane ES1 and has a peripheral section arranged in the lubricant 32.

[0052] like Figure 4 As shown in FIG. 1 , due to the distribution of the lubricant 32 in the transmission space 4 at a higher rotational speed, the lubricant surface 33 drops from the stationary lubricant plane ES1 in the transmission space 4 to the running lubricant plane ES2, whose level is located vertically below the vertically deepest peripheral section of the ring wheel 30. The level of the running lubricant plane ES2 is also vertically deeper than the blocking position of the closing element 35. Due to the smaller density of the closing element 35 relative to the lubricant 32, when the lubricant surface 33 starts to drop from the blocking position, the closing element 35 floats on the lubricant 32 and moves from the blocking position to the release position in accordance with the position of the running lubricant plane ES2.

[0053] When the level of the rotating lubricant surface 33 passing through the ring wheel 30 drops further, the closing element 35 follows the lubricant surface 33 to the release position. The release position is defined here by a stop 36. The guide section 13 of the first aperture 12 is partially blocked on one side of the transmission space opening 16 by the stop 36. The stop 36 is arranged here so that the closing element 35 cannot completely come out of the first aperture 12 or from the guide section 13. In other words, the stop 36 fixes the closing element 35 in the first aperture 12. Here, the stop 36 is designed as a stop element connected to the transmission housing element 18.

[0054] The closing element 35 is therefore part of a valve 34 which is designed to release or block a fluid connection between the motor space 3 and the transmission space 4 via the first passage 12. The valve 34 can also be referred to as a self-switching valve, in particular a self-switching non-return valve. Here, the valve 34 is formed by the closing element 35 and the first passage 12. However, it is also conceivable to implement the valve 34 as a unit, for example as a plug-in card unit that is inserted into the first passage 12.

[0055] The aforementioned embodiments relate essentially to the intended installation position of the electric drive device 1 in a vehicle, wherein the vehicle is arranged on a horizontal plane.

[0056] Reference numerals list

[0057] 1 Electric drive

[0058] 2 Housing

[0059] 3 Motor Space

[0060] 4 Transmission space

[0061] 5 Motor cover

[0062] 6 Motor housing components

[0063] 7 Middle wall

[0064] 8 Pass-through part

[0065] 9 Gap

[0066] 10 Bearing accommodation section

[0067] 11 Throttling section

[0068] 12 Pass-through part

[0069] 13 Boot Segment

[0070] 14 Blocking Sections

[0071] 15 Motor space access

[0072] 16 Transmission space access part

[0073] 17 Middle plate

[0074] 18 Transmission housing element

[0075] 19 Motor

[0076] 20 Rotor

[0077] 21 Stator

[0078] 22 Air gap

[0079] 23 Motor shaft

[0080] 24 Pinion Segment

[0081] 25 Through section

[0082] 26 Support section

[0083] 27 Transmission

[0084] 28 Spur gear drive

[0085] 29 Differential

[0086] 30 Ring Wheel

[0087] 31 Differential case

[0088] 32 Lubricant

[0089] 33 Lubricant surface

[0090] 34 valve

[0091] 35 Closure element

[0092] 36 Stopper

[0093] 37 Motor cover bearing

[0094] 38 Intermediate wall bearing

[0095] 39 Cooling channels

[0096] L23 drive shaft

[0097] L20 rotor shaft

[0098] L29 Rotation axis

[0099] ES1 Stationary Lubricant Flat

[0100] ES2 running lubricant level

Claims

1. An electric drive device for driving a motor vehicle, comprising: Motor (19); a motor shaft (23) which can be driven by the motor (19) to rotate around a drive shaft (L23), a transmission device (27) drivingly connected to the motor shaft (23); and A housing (2) containing a lubricant (32), wherein the housing (2) has an intermediate wall (7) which delimits a transmission space (4) in which the transmission (27) is arranged and a motor space (3) in which the electric motor (19) is arranged; wherein the intermediate wall (7) has a first aperture (12) which establishes a fluid connection between the motor space (3) and the transmission space (4); and A valve (34) with a closing element (35) is provided, which valve can be switched into a blocking position in which a fluid connection between the motor space (3) and the transmission space (4) is blocked, and a release position in which a fluid connection between the motor space (3) and the transmission space (4) is released. It is characterized in that The first aperture (12) comprises a guide section (13) in which the closure element (35) is guided and which, in a nominal installation position of the electric drive (1), extends obliquely to the horizontal.

2. The electric drive device according to claim 1, It is characterized in that The motor shaft (23) extends through the second aperture (8) of the intermediate wall (7) in such a way that lubricant (32) can enter the motor space (3) from the transmission space (4) through the gap (9) between the motor shaft (23) and the intermediate wall (7).

3. The electric drive device according to any one of claims 1 or 2, It is characterized in that The electric machine (19) has an air gap (22) formed between the stator (21) and the rotor (20); The motor shaft (23) is connected to the rotor (20) of the motor (19); In the rated installation position and while the motor shaft (23) is stationary without being driven, the lubricant (32) forms a lubricant surface (33) in the transmission space, which defines a stationary lubricant plane (ES1); At least one gear of the transmission device (27) is immersed in the lubricant (32); as well as The vertically deepest peripheral section of the air gap (22) is located below the stationary lubricant plane (ES1).

4. The electric drive device according to claim 3, It is characterized in that The first through-hole (12) has a motor space access portion (15) opened in the direction of the motor space (3) and a transmission space access portion (16) opened in the direction of the transmission space (4), wherein in the rated installation position the motor space access portion (15) is arranged in the vertical direction to be deeper than the deepest peripheral section of the air gap (22), and / or In the rated installation position, the motor space access (15) is arranged vertically higher than the transmission space access (16), and / or In the rated installation position and when the motor shaft (23) is stationary without being driven, the transmission space access (16) is arranged below the stationary lubricant level (ES1), and / or In the rated installation position and while the motor shaft (23) is driven, the transmission space access (16) is arranged at least partially above the running lubricant level (ES2), and / or In the rated installation position and while the motor shaft (23) is driven, the motor chamber access (15) is arranged above the operating lubricant level (ES2).

5. The electric drive device according to any one of claims 1 to 4, It is characterized in that The fluid connection between the motor space (3) and the transmission space (4) via the first passage (12) can be selectively released and blocked, wherein the valve (34) is in particular self-switching.

6. The electric drive device according to any one of claims 1 to 5, It is characterized in that The closing element (35) is designed as a spherical element, which is movably arranged in the first passage (12). In this case, the closure element (35) is in particular made of rubber.

7. The electric drive device according to claim 6, It is characterized in that The closing element (35) has a lower density than the lubricant (32), so that in the nominal installation position and when the motor shaft (23) is at rest without being driven, the closing element (35) is loaded by the lubricant (32) with a buoyancy force in the direction of the blocking position.

8. The electric drive device according to claim 7, It is characterized in that The cross section of the first through-hole (12) is defined in the region of the guide section (13) by a first largest inscribed circle, and The cross section of the first through-hole (12) is defined by a second largest inscribed circle in the second region (14), Wherein, the first largest inscribed circle has a diameter greater than a diameter of the second largest inscribed circle.

9. The electric drive device according to claim 8, It is characterized in that The area of ​​the guide section (13) is closer to the transmission space (4) than the second area (14).

10. The electric drive device according to any one of claims 1 to 9, It is characterized in that A stop (36) is arranged in the transmission space (4), against which the closure element (35) abuts in the release position.

11. The electric drive device according to any one of claims 1 to 10, It is characterized in that A fluid throttling device, such as a non-contact seal, is arranged in the second passage (8).

12. The electric drive device according to any one of claims 1 to 11, It is characterized in that In the rated installation position, the vertically deepest toothed section of the transmission (27) is vertically higher than the vertically deepest peripheral section of the air gap (22).

13. The electric drive device according to any one of claims 1 to 12, It is characterized in that The motor shaft (23) has a pinion section (24), a through section (25) and a bearing section (26) located therebetween.

14. The electric drive device according to claim 13, It is characterized in that in, The pinion section (24) is arranged in the transmission space (4) and has a maximum pinion diameter (D24), and The through-section (25) is arranged in the second through-section (8) of the intermediate wall (7) and has a maximum through-section diameter (D25), and The bearing section (26) accommodates a bearing (38) for rotatably supporting the motor shaft (23) relative to the intermediate wall (7) and has a maximum bearing section diameter (D26), Therein, the maximum pinion diameter (D24) is smaller than or equal to the maximum bearing section diameter (D26) and / or smaller than or equal to the maximum through-section diameter (D25).

15. The electric drive device according to claim 14, It is characterized in that The maximum bearing section diameter (D26) is less than or equal to the maximum through section diameter (D25).

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