Motor vehicle drive unit and electrically drivable motor vehicle drive axle

Abstract

Motor vehicle drive unit and electrically drivable motor vehicle drive axle. The motor vehicle drive unit comprises an electric machine and a transmission device, to which a supply circuit is assigned which is able to supply them jointly with a lubricant and / or a coolant. The supply circuit has a first and a second collection region, in the first collection region of which a suction side of the transport device is connected. The first collection region is arranged below the transmission device in the direction of gravity and in the operation of the motor vehicle drive unit captures at least one partial return flow of lubricant and / or coolant from the transmission device in the supply circuit. The second collection region is arranged below the electric machine and above the first collection region in the direction of gravity and in the operation of the motor vehicle drive unit captures at least one partial return flow of lubricant and / or coolant from the electric machine in the supply circuit. Furthermore, the second collection region is connected with the first collection region, whereby lubricant and / or coolant can be discharged from the second collection region into the first collection region.

Description

Technical Field

[0001] This invention relates to a motor vehicle drive unit, particularly a motor vehicle drive unit for an electrically driven motor vehicle drive axle. The motor vehicle drive unit includes a motor and a transmission device located on the driven side of the motor. A supply circuit is provided for the motor and the transmission device, in which lubricant and / or coolant can be supplied to both the motor and the transmission device. The supply circuit has a first collection area and a second collection area, in which the suction side of a transport device is connected. The lubricant and / or coolant can be extracted from the first collection area via the transport device for delivery to the motor and the transmission device. Furthermore, this invention also relates to an electrically driven motor vehicle drive axle having the aforementioned motor vehicle drive unit. Background Technology

[0002] In electrically driven vehicle drive axles, in addition to lubricating and cooling mechanical components such as the corresponding transmission, the corresponding motor is also typically cooled. For this purpose, the motor is usually connected to a supply circuit in which liquid lubricant and coolant, usually in the form of oil, are guided to the stator and rotor of the motor for cooling, thereby enabling efficient motor operation. Here, the motor and the corresponding transmission are usually supplied together in their respective supply circuits. Typically, vehicle drive axles require a compact structure; therefore, the aforementioned shared supply circuit for the motor and transmission is partially equipped with multiple collection areas to ensure adequate lubrication and cooling of the motor and transmission while maintaining a low structural height for the vehicle drive axle.

[0003] A motor vehicle drive unit for a motor vehicle drive axle is disclosed in DE 10 2022 113 288 A1. This motor vehicle drive unit includes a motor and a transmission device located on the driven side of the motor. The motor and transmission device are connected to a supply circuit in which lubricant and / or coolant are supplied to both the motor and transmission device. The supply circuit is equipped with two collection areas, with a first collection area connected to the suction side of a conveying device. During operation of the motor vehicle drive unit, lubricant and / or coolant can be drawn from the first collection area via a pump of the conveying device and transported to the main supply line, from which lubricant and / or coolant is first delivered to the motor and subsequently to the area of ​​the transmission device awaiting supply. The second collection area is arranged below the motor and transmission device in the direction of gravity and overlaps with the transmission device and motor in the horizontal direction, whereby lubricant and / or coolant flowing out of the motor and transmission device after delivery is collected. Here, the second collection area is horizontally placed next to the first collection area and is designed with a compact vertical structure to achieve a compact structure for the motor drive unit in the areas of the transmission and motor. The conveying device is equipped with an additional pump, via which lubricant and / or coolant accumulated in the second collection area can be transferred to the first collection area. Summary of the Invention

[0004] Starting from the prior art described above, the objective of this invention is to create a motor vehicle drive unit in which a reliable supply of lubricant and / or coolant to the motor and transmission is achieved in the supply circuit while maintaining a compact structure and minimizing manufacturing costs.

[0005] This task begins with the preamble of claim 1, incorporating the distinguishing features of claim 1. The subsequent dependent claims reflect advantageous modifications of the invention. Furthermore, an electrically driven motor vehicle drive axle having a motor vehicle drive unit according to the invention is the subject of claim 14.

[0006] According to the present invention, a motor vehicle drive unit includes a motor and a transmission device located on the driven side of the motor. A supply circuit is provided for the motor and the transmission device, in which lubricant and / or coolant can be supplied to both the motor and the transmission device. The supply circuit has a first collection area and a second collection area, in which the suction side of a conveying device is connected, allowing lubricant and / or coolant to be extracted from the first collection area and delivered to the motor and the transmission device. The motor vehicle drive unit according to the present invention is particularly configured for application at the drive axle of an electrically driven motor vehicle.

[0007] According to the present invention, a motor vehicle drive unit has a motor connected to a rear-mounted transmission device on the driven side. Here, the transmission device is particularly configured to couple the motor on the driven side to at least one driven part of the motor vehicle drive unit, wherein, in this coupling configuration, the transmission device further preferably performs a transmission ratio conversion of the drive motion between the motor and at least one driven part. Here, it is particularly preferred that at least two driven parts are provided, and when the motor vehicle drive unit according to the present invention is used in a motor vehicle drive axle, connections to each wheel carrier are established, in particular, when the driven parts are in operation.

[0008] Within the scope of this invention, in this respect, "transmission device" refers to a mechanical link along which a mechanical coupling between a motor and at least one driven part is established or can be established. Therefore, switchability can also be achieved in the transmission device to selectively decouple the motor from at least one driven part when necessary. The transmission device within the scope of this invention may have a shift gear set in which different gear ratios can be switched, and / or a differential gear set to distribute drive motion to two preferably configured driven parts.

[0009] The electric motor, in a manner known in principle to those skilled in the art, comprises a stator and a rotor, wherein the motor preferably functions as both an electric motor and a generator. In principle, the motor can be designed as a permanent magnet excited synchronous motor or a separately excited synchronous motor, or it can also be designed as an asynchronous motor. In the context of this invention, it is further conceivable that the vehicle drive unit may have an additional motor besides the electric motor, which is preferably also connected or can be connected via a transmission device. However, it is particularly preferred that exactly one motor is provided in this vehicle drive unit.

[0010] In the motor vehicle drive unit according to the invention, the motor and transmission are connected in a common supply circuit in which the motor and transmission are supplied with lubricant and / or coolant during operation of the motor vehicle drive unit. The lubricant and / or coolant is in particular a liquid lubricant and / or coolant, and is particularly preferably an oil, wherein the liquid is used for both lubrication and cooling.

[0011] Lubricant and / or coolant circulates, particularly in the supply circuit, during the operation of the vehicle drive unit and is supplied to the transmission and motor. Specifically, in the motor, it is preferably supplied to the rotor and stator cooling sections, and if necessary, to the bearing sections. In the transmission, it is supplied, particularly to specific areas of the machinery, such as gear meshing sections and bearing sections. To deliver the lubricant and / or coolant to the motor and transmission, a conveying device is provided in the supply circuit, which transports the lubricant and / or coolant towards the areas requiring supply during the operation of the vehicle drive unit.

[0012] According to the invention, the supply circuit is equipped with collection areas, which are preferably used to capture and collect lubricant and / or coolant. Specifically, each collection area is defined with a volume in which the lubricant and / or coolant is captured and collected. Here, the first collection area of ​​these collection areas is also connected to the suction side of the conveying device, so that the conveying device can extract the lubricant and / or coolant there for delivery to the motor and transmission.

[0013] The present invention now includes the following technical teachings: a first collection area is arranged in the direction of gravity below the transmission and, during operation of the vehicle drive unit, captures and returns at least a portion of the lubricant and / or coolant flowing out of the transmission after delivery in the supply circuit. Furthermore, a second collection area is arranged in the direction of gravity below the motor and above the first collection area and, during operation of the vehicle drive unit, captures and returns at least a portion of the lubricant and / or coolant flowing out of the motor after delivery in the supply circuit. The second collection area is connected to the first collection area, thereby allowing lubricant and / or coolant to be discharged from the second collection area into the first collection area.

[0014] In other words, the first collection area is vertically located below the transmission and is configured to capture and collect at least one portion of the lubricant and / or coolant flowing out of the transmission after its respective supply to the vehicle drive unit during operation. Furthermore, the second collection area is designed to be vertically located below the motor and vertically above the first collection area, wherein the second collection area is used to collect at least one portion of the lubricant and / or coolant flowing out of the motor after its supply to the motor during operation of the vehicle drive unit. Moreover, the second collection area is connected to the first collection area, thereby enabling the discharge of lubricant and / or coolant from the second collection area to the first collection area.

[0015] The design of the vehicle drive unit according to the present invention has the following advantages, firstly, achieving a compact structure. Because the first collection area, arranged below the transmission in the direction of gravity, can be vertically positioned closer to the transmission during operation of the vehicle drive unit without immersing transmission components in the lubricant and / or coolant collected there. This is because the second collection area acts as a buffer volume, where the lubricant and / or coolant flowing from the motor during operation of the vehicle drive unit is first collected and then discharged towards the first collection area. Therefore, instead of a common collection area for collecting lubricant and / or coolant flowing from the transmission and motor, the present invention divides the collection area into two, allowing extraction from the first collection area within the two collection areas via a transport device. Furthermore, because the second collection area is vertically arranged above the first collection area in the direction of gravity, the discharge of lubricant and / or coolant into the first collection area is designed without a pump, simplifying the structure of the vehicle drive unit and thus reducing its manufacturing cost.

[0016] According to the invention, the first collection area captures at least a portion of the lubricant and / or coolant flowing out of the transmission device. Here, the first collection area is particularly preferably used to directly capture all lubricant and / or coolant flowing out of the transmission device, wherein multiple portions may converge in the first collection area. In particular, the first collection area horizontally overlaps at least with the area of ​​the transmission device.

[0017] However, the first collection area is also used to capture lubricant and / or coolant discharged from the second collection area into the first collection area. For this purpose, the first collection area is arranged below the second collection area in the direction of gravity. The second collection area is configured to directly capture at least a portion of the lubricant and / or coolant flowing from the motor, wherein, in particular, all lubricant and / or coolant flowing from the motor is captured in this second collection area. Multiple portions of the lubricant and / or coolant may converge in the second collection area.

[0018] In particular, the second collection area is connected to the first collection area via at least one line, through which lubricant and / or coolant can be discharged from the second collection area to the first collection area. Alternatively, but preferably, the discharge of lubricant and / or coolant from the second collection area to the first collection area occurs under gravity. In the sense of this invention, "line" is preferably understood as a volume of lubricant and / or coolant used to guide between respective connection points. Here, the corresponding line may consist of multiple sub-segments. Furthermore, the corresponding line may be formed entirely through pipes, entirely through channels (defined by surrounding components, such as a housing), or segmentally through one or more pipes and segmentally through one or more channels.

[0019] If, in addition to the motor, at least one other motor is provided in the motor vehicle drive unit according to the invention, the second collection area may also be arranged below the at least one other motor in the direction of gravity and capture at least one portion of the lubricant and / or coolant flowing out from the at least one other motor after delivery and return it. However, within the scope of the invention, a separate, additional collection area may also be assigned to the at least one other motor, which is then arranged below the at least one other motor and above the first collection area in the direction of gravity. This separate, additional collection area may then be connected to the first collection area in a manner similar to the second collection area.

[0020] According to one embodiment of the invention, the second collection area is arranged to overlap with the motor in the horizontal direction. This reliably achieves a compact arrangement of the second collection area and also reliably captures at least one portion of the return flow from the motor. Furthermore, the second collection area is preferably also arranged in the direction of gravity between the motor and a portion of the transmission, wherein the second collection area here overlaps with this portion of the motor and transmission in the horizontal direction. A particularly preferred improvement of the above embodiment is that the second collection area is arranged horizontally next to the area of ​​the transmission, especially next to the differential gear set. This is because there is structural space suitable for accommodating the second collection area in this area.

[0021] According to a feasible design according to the invention, a drain line extends between the second collection area and the first collection area, connecting the first and second collection areas to each other, and allowing for continuous draining from the second collection area to the first collection area. This has the advantage that lubricant and / or coolant can thus be continuously returned from the second collection area to the first collection area via the drain line, and subsequently extracted from the first collection area via a conveying device. Here, the second collection area is used to buffer a certain volume of lubricant and / or coolant during the operation of the vehicle drive unit.

[0022] In an improved version of the aforementioned feasible design, the discharge line has a cross-section under which a volumetric flow occurs during continuous discharge from the second collection area to the first collection area. This volumetric flow is selected to adjust the lubricant and / or coolant level in the first collection area during operation of the vehicle drive unit. Thus, advantageously, although continuous outflow towards the first collection area is possible via the discharge line, a throttling section is formed to a certain extent due to the defined cross-section, ensuring that the desired level is adjusted in the first collection area during continuous operation of the vehicle drive unit. Preferably, the discharge line has a contraction in its cross-section, which can be designed in a region communicating with the first collection area, in a region communicating with the second collection area, or in an intermediate section of the discharge line.

[0023] More particularly preferably, at least one rotatable transmission element of the transmission extends into the first collection area, wherein the liquid level is defined such that it lies below the extended transmission element at least during operation of the vehicle drive unit. Thus, at least during operation of the vehicle drive unit, agitation of at least one transmission element in the lubricant and / or coolant is prevented, i.e., based on the design of the wiring harness having this cross-section and the accompanying limitation of the liquid level, preventing at least one transmission element from immersing in the lubricant and / or coolant accumulated in the first collection area. Because at least one transmission element extends into the first collection area, the first collection area can be arranged vertically close to the transmission, thereby enabling a particularly compact structure of the vehicle drive unit. In particular, this liquid level is generated when the vehicle drive unit is put into operation and when the lubricant and / or coolant begins to be extracted from the first collection area via the transport device.

[0024] Another conceivable variation of the aforementioned feasible design is that the drain line is connected to the bottom of the second collection area, wherein this connection is specifically implemented at the lowest point of the bottom in the direction of gravity. This ensures complete emptying of the material via the drain line to the first collection area when the vehicle drive unit is no longer in operation.

[0025] Another embodiment of the invention involves dividing the second collection region into a first sub-region and a second sub-region via a partition wall, the partition wall forming an overflow portion between these sub-regions. The first sub-region of the second collection region captures at least a portion of the backflow from the motor, and at least the second sub-region of the second collection region is connected to the first collection region. This has the advantage that the return of lubricant and / or coolant from the second collection region to the first collection region only occurs, by means of the overflow portion and the connection between the second sub-region and the first collection region, when the lubricant and / or coolant reaches a level above the overflow portion in the second collection region.

[0026] However, combining the above-described embodiments with variations of the above-described design feasible solutions is preferred, resulting in a continuous return from the first sub-region of the second collection space to the first collection region, and this return is further enhanced when it exceeds the overflow section. Therefore, a particularly suitable return to the first collection region can be achieved.

[0027] In an improved embodiment described above, a second sub-region of the second collection region is connected to the first collection region via a return line, which allows for permanent discharge from the second sub-region of the second collection region to the first collection region. This has the advantage that a reliable return to the first collection region is achieved by means of the return line, thus extending beyond the overflow portion defined between the sub-regions.

[0028] According to another feasible design according to the invention, the conveying device includes a conveying pump connected to a first collection area on the suction side and to a supply line on the discharge side, via which delivery can be made to the areas to be supplied to the motor and the drive mechanism, respectively. This allows for a suitable structure for the conveying device, wherein preferably only one conveying pump is provided. On the suction side, the conveying pump is connected to the first collection area, particularly via an intermediate suction filter and suction line.

[0029] In an improved version of the aforementioned feasible design, the delivery pump is connected to the main supply line on the pressure side, and the main supply line branches into several supply lines. Here, a heat exchanger and / or a filter is preferably arranged in the main supply line. The heat exchanger allows the temperature of the lubricant and / or coolant to be reliably reduced after extraction from the first collection area. Arranging a filter in the main supply line has the advantage that unwanted particles can be reliably separated from the lubricant and / or coolant.

[0030] Alternatively, but preferably, one of the supply lines terminates at the stator cooling section of the motor stator, and / or one supply line terminates at the rotor cooling section of the motor rotor, and / or at least one supply line terminates at each gear meshing section of the transmission. In particular, multiple supply lines are provided in the aforementioned supply lines, thereby enabling suitable supply to certain areas of the motor and the transmission.

[0031] Furthermore, the subject of this invention is also an electrically driven vehicle drive axle, which includes a vehicle drive unit according to one or more of the variants described above. Here, the vehicle drive axle may be an axle for commercial vehicles. Attached Figure Description

[0032] Advantageous embodiments of the invention, as described below, are shown in the accompanying drawings. Wherein:

[0033] Figure 1 and Figure 2 Different views of a motor vehicle drive unit according to a preferred embodiment of the present invention are shown. Detailed Implementation

[0034] from Figure 1 and Figure 2 Different views of a vehicle drive unit 1 are shown below. This vehicle drive unit, according to a preferred embodiment of the invention, is designed and configured for use in an electrically driven vehicle drive axle. The vehicle drive unit 1 here includes a motor 2 and a transmission 3. The motor 2 is formed by a stator 4 and a rotor 5 and can exist as a permanent magnet excited synchronous motor, a separately excited synchronous motor, or an asynchronous motor. Furthermore, the motor 2 can operate as both an electric motor and a generator.

[0035] The transmission device 3 is positioned on the driven side of the motor 2 and couples the motor 2 to two driven shafts 6 and 7. These two driven shafts respectively form a driven part 8 and 9 of the vehicle drive unit 1 and, when used in an electrically driven vehicle drive axle, guide the vehicle drive unit 1 to each wheel carrier. The transmission device 3 includes two cylindrical gear stages 10 and 11 and a differential gear set 12, which is currently designed as a bevel gear differential. The cylindrical gear stage 10 couples the rotor shaft 13, connected to the rotor 5, to an offset intermediate shaft 14, which is in turn coupled to the input side of the differential gear set 12 via the cylindrical gear stage 11. During the electric motor operation of the motor 2, the driving motion of the motor 2 is thus converted to the input side of the differential gear set 12 via the gear ratio of the two cylindrical gear stages 10 and 11, and the differential gear set then distributes power to the two driven shafts 6 and 7.

[0036] For lubrication and cooling, the motor 2 and transmission 3 are connected together in the vehicle drive unit 1 to a supply circuit 15, in which lubricant and coolant are selectively delivered to the areas of the motor 2 and transmission 3 that require supply. Here, the lubricant and coolant are liquids in the form of oil. The supply circuit 15 includes a delivery device 16 with a delivery pump 17, to which a suction line 18 is connected on the suction side. The suction line 18 connects the delivery pump 17 to a suction mechanism 19, via which the delivery pump 17 can draw lubricant and coolant from the collection area 20. Specifically, the suction mechanism 19 is equipped with a screen to prevent larger particles from being drawn into the delivery pump 17.

[0037] A main supply line 21 is connected to the pump 17 on the pressure side. Before the main supply line branches into multiple supply lines 24, 25, 26, and 27, a heat exchanger 22 is first arranged in the main supply line, followed by a filter device 23. Supply lines 24 to 27 are then directed to the respective supply areas of the motor 2 and the transmission device 3. Specifically, supply line 24 extends to the rotor cooling section of the rotor 5, supply line 25 extends to the stator cooling section of the stator 4, and supply lines 26 and 27 extend to the gear meshing sections of the cylindrical gear stages 10 and 11 and subsequently also extend to the differential gear set 12.

[0038] Collection area 20 is arranged below the transmission device 3 in the direction of gravity and overlaps with the transmission device horizontally. Here, collection area 20 captures partial backflow of lubricant and coolant 28 and 29, which, after being conveyed via supply lines 26 and 27, will be discharged vertically downwards from the transmission device 3 due to gravity. Conversely, lubricant and coolant conveyed to the motor 2 via supply lines 24 and 25 are captured by collection area 30, which is arranged below the motor 2 in the direction of gravity and overlaps with the motor horizontally. Here, collection area 30 is located above collection area 20 and horizontally (e.g., especially in…) Figure 2 As can be seen from the image, it is located next to the differential gear set 12 and the driven shaft 7.

[0039] As in Figure 1 besides Figure 2 As can be seen, the collection area 30 is divided into two sub-areas 31 and 32 such that the two sub-areas 31 and 32 are separated from each other by a partition wall 33 located in the middle. Sub-area 31 captures portions 34 and 35 of the lubricant and coolant supplied to the motor 2 via supply lines 24 and 25, which flow vertically downwards under the influence of gravity; these portions 34 and 35 are thus collected together. Specifically, the discharge of portions 28, 29, 34, and 35 occurs in the supply circuit 15 via their respective return lines.

[0040] Collection area 30 is connected to collection area 20, which is located below in the direction of gravity, via a discharge line 36. This discharge line, on the collection area 30 side, communicates with the lowest region in the direction of gravity at the bottom of sub-area 31, enabling the persistent discharge of lubricant and coolant from sub-area 31 to collection area 20. Here, the discharge line 36 is designed with a cross-section at which a defined volumetric flow occurs during persistent discharge. This volumetric flow ensures that, during the operation of the vehicle drive unit 1 and the accompanying extraction of lubricant and coolant from collection area 20 via delivery pump 17, the lubricant and coolant are adjusted (in...) within collection area 20. Figure 1 (Illustrated) Liquid level 37. At this liquid level 37, the gear 38 extending into the collection area 20 from the cylindrical gear stage 11 of the transmission device 3 is not immersed in the lubricant and coolant collected therein, thereby preventing agitation of the gear 38 in the lubricant and coolant. The required line cross-section for adjusting the liquid level 37 is preferably achieved in the drain line 36 via a throttling section (not shown).

[0041] Furthermore, in the collection area 30, the partition wall 33 also forms an overflow section 39, through which lubricant and coolant can overflow from sub-area 31 into sub-area 32 from the point where the liquid level in the collection space 30 is reached. Sub-area 32 is also connected to the collection area 20 in the same way, that is, a return line 40 extends between sub-area 32 and collection area 20. Through the return line 40, the lubricant and coolant accumulated in sub-area 32 can flow out into collection area 20. Therefore, from the point where the liquid level in collection area 30 exceeds the level defined by the overflow section 39, lubricant and coolant are simultaneously discharged via the discharge line 36 and the return line 40.

[0042] By means of the design scheme according to the present invention, a motor vehicle drive unit can be provided in which a reliable supply of lubricant and coolant to the motor and transmission is achieved in the supply circuit while maintaining a compact structure and minimizing manufacturing costs.

[0043] List of reference numerals

[0044] 1. Motor vehicle drive unit

[0045] 2 motors

[0046] 3. Transmission device

[0047] 4. Stator

[0048] 5 rotors

[0049] 6 driven shafts

[0050] 7 Driven Shaft

[0051] 8. Follower

[0052] 9. Follower

[0053] 10 Cylindrical Gear Stage

[0054] 11 Cylindrical Gear Stage

[0055] 12 Differential gear set

[0056] 13 Rotor shaft

[0057] 14 Intermediate Shaft

[0058] 15 Supply loop

[0059] 16. Transport equipment

[0060] 17. Transport pump

[0061] 18 Suction Circuit

[0062] 19. Suction Mechanism

[0063] 20 Collection Areas

[0064] 21 Main Supply Lines

[0065] 22 Heat exchanger

[0066] 23 Filtration device

[0067] 24 Supply Lines

[0068] 25 Supply Lines

[0069] 26 Supply Lines

[0070] 27 Supply Lines

[0071] 28. Partial reflux

[0072] 29. Partial reflux

[0073] 30 Collection Area

[0074] 31 sub-regions

[0075] 32 sub-regions

[0076] 33. Partition wall

[0077] 34. Partial reflux

[0078] 35. Partial reflux

[0079] 36 rows of conductors

[0080] 37 Liquid Level

[0081] 38 gears

[0082] 39 Overflow section

[0083] 40 Return Route

Claims

1. A motor vehicle drive unit (1), particularly a motor vehicle drive unit for an electrically driven motor vehicle drive axle, the motor vehicle drive unit comprising a motor (2) and a transmission device (3) located on the driven side of the motor (2), wherein, A supply circuit (15) is provided for the motor (2) and the transmission device (3) to supply lubricant and / or coolant to both the motor (2) and the transmission device (3). The supply circuit (15) has a first collection area (20) and a second collection area (30). The first collection area (20) is connected to the suction side of a conveying device (16), through which lubricant and / or coolant can be extracted from the first collection area (20) and delivered to the motor (2) and the transmission device (3). The first collection area (20) is arranged below the transmission device (3) in the direction of gravity and within the vehicle drive unit (1). During operation, at least a portion of the lubricant and / or coolant flowing out of the transmission device (3) after delivery is captured in the supply circuit (15) and returned (28, 29). The second collection area (30) is arranged in the direction of gravity below the motor (2) and above the first collection area (20) and during operation of the motor vehicle drive unit (1), at least a portion of the lubricant and / or coolant flowing out of the motor (2) after delivery is captured in the supply circuit (15) and returned (34, 35). The second collection area (30) is connected to the first collection area (20), thereby enabling the lubricant and / or coolant to be discharged from the second collection area (30) to the first collection area (20).

2. The motor vehicle drive unit (1) according to claim 1, characterized in that, The second collection area (30) is positioned to overlap the motor (2) in the horizontal direction.

3. The motor vehicle drive unit (1) according to claim 2, characterized in that, The second collection area (30) is placed horizontally next to the area of ​​the transmission device (3), especially next to the differential gear set (12).

4. The motor vehicle drive unit (1) according to at least one of claims 1 to 3, characterized in that, A drain line (36) extends between the second collection area (30) and the first collection area (20), the drain line connecting the first collection area (20) and the second collection area (30) to each other, and the drain line allowing persistent draining from the second collection area (30) to the first collection area (20).

5. The motor vehicle drive unit (1) according to claim 4, characterized in that, The discharge line (36) has a line cross-section under which a volume flow occurs during persistent discharge from the second collection area (30) to the first collection area (20), wherein the volume flow is selected here to adjust a defined level (37) of lubricant and / or coolant in the first collection area (20) during operation of the motor vehicle drive unit (1).

6. The motor vehicle drive unit (1) according to claim 5, characterized in that, At least one rotatable transmission element of the transmission device (3) extends into the first collection area (20), wherein the liquid level (37) is defined such that the liquid level (37) is below the extended transmission element at least during operation of the motor vehicle drive unit (1).

7. The motor vehicle drive unit (1) according to at least one of claims 4 to 6, characterized in that, The discharge line (36) is connected to the bottom of the second collection area (30), especially to the area of ​​the bottom that is lowest in the direction of gravity.

8. The motor vehicle drive unit (1) according to at least one of the preceding claims, characterized in that, In the second collection area (30), a first sub-area (31) and a second sub-area (32) are divided by a partition wall (33), the partition wall forming an overflow section (39) between the sub-areas (31, 32), wherein the first sub-area (31) of the second collection area (30) captures at least one portion of the backflow (34, 35) from the motor (2), and at least the second sub-area (32) of the second collection area (30) is connected to the first collection area (20).

9. The motor vehicle drive unit (1) according to claim 8, characterized in that, The second sub-region (32) of the second collection area (30) is connected to the first collection area (20) via a return line (40) that allows permanent discharge from the second sub-region (32) of the second collection area (30) to the first collection area (20).

10. The motor vehicle drive unit (1) according to at least one of the preceding claims, characterized in that, The conveying device (16) includes a conveying pump (17) which is connected to the first collection area (20) on the suction side and to the supply lines (24, 25, 26, 27) on the pressure side, and can convey to the areas to be supplied to the motor (2) and the transmission device (3) respectively via the supply lines.

11. The motor vehicle drive unit (1) according to claim 10, characterized in that, The transport pump (17) is connected to the main supply line (21) on the pressure side, and the main supply line branches into the supply lines (24, 25, 26, 27).

12. The motor vehicle drive unit (1) according to claim 11, characterized in that, A heat exchanger (22) and / or a filter (23) are arranged in the main supply line (21).

13. The motor vehicle drive unit (1) according to at least one of claims 10 to 12, characterized in that, One of the supply lines (24, 25, 26, 27) terminates at the stator cooling section of the stator (4) of the motor (2), and / or one supply line (24) terminates at the rotor cooling section of the rotor (5) of the motor (2), and / or at least one supply line (26, 27) terminates at each gear meshing section of the transmission device (3).

14. An electrically drivable motor vehicle drive axle, said motor vehicle drive axle comprising a motor vehicle drive unit (1) according to at least one of claims 1 to 13.

Images