CN115441651A

CN115441651A - Drive device for a motor vehicle

Info

Publication number: CN115441651A
Application number: CN202210617825.2A
Authority: CN
Inventors: F.米勒
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2021-06-04
Filing date: 2022-06-01
Publication date: 2022-12-06
Also published as: DE102021205678A1

Abstract

The invention relates to a drive device (1) for a motor vehicle, comprising an electric machine (2), a transmission (3), a housing (4), wherein the housing (4) forms an engine compartment (5) and a transmission compartment (6), the electric machine (2) comprises a stator (2 a) and a rotor (2 b) as well as a rotor shaft (2 c), an oil sump (7) is arranged in the transmission compartment (6), oil can be conducted from the oil sump (7) into the region of the rotor (2 b) via an oil supply system and from the rotor (2 b) back into the oil sump (7) via an oil discharge system, a cooling water jacket (9) is formed in the region of a peripheral wall (8) of the engine compartment (5), and the electric machine (2) is arranged to lie flat above an oil surface (7 a) of the oil sump (7). The thermal coupling between the returning oil and the cooling water jacket (9) is at least partially achieved when the oil flows back from the electric machine (2) to the oil sump (7) via an oil drainage system, which has a receiving space (18) which is achieved by a housing recess (19) which at least partially receives the oil during the return flow and a separating element (20) which is arranged separately in and/or on the housing recess (19) and blocks the returning oil.

Description

Drive device for a motor vehicle

Technical Field

The invention relates to a drive for a motor vehicle, comprising at least one electric machine, at least one transmission, in particular a differential, and at least one housing, in particular of multi-part construction.

Background

A plurality of drive devices for motor vehicles are known from the prior art. Such drives have an electric motor and/or an internal combustion engine, different types of transmissions, a transmission, in particular a step transmission, a shifting transmission, in particular also a differential. The above-mentioned components are at least partially or completely integrated or arranged in a respective housing or at least partially integrated or arranged in a common housing. The housing can be composed and/or constructed in particular in multiple parts, in particular from a plurality of housing halves which can be connected to one another.

The respective housing essentially has an engine compartment and a transmission compartment, wherein, in a specific drive, the electric motor is arranged in the engine compartment and the transmission is arranged in the transmission compartment. The transmission arranged in the transmission chamber can be designed in particular as a differential, or a transmission can be arranged in the transmission chamber, in particular in addition to the differential, which transmission is arranged in particular effectively between the differential and the electric machine.

In general, an electric machine arranged in an engine compartment has a stator fixed to a housing and a rotor arranged radially inside the stator and a rotor shaft. The cooling of the electric machine is achieved in particular by oil cooling. An oil sump is present and/or provided in the gear chamber, wherein, for cooling the rotor and/or the rotor shaft, oil can be conducted from the oil sump into the region of the rotor via an oil supply system and from the rotor back into the oil sump via an oil discharge system. The oil guiding system, which is designed in this way and comprises an oil supply system and an oil discharge system, is embodied and/or designed in particular such that: so that the oil required for cooling the rotor and/or the rotor shaft is cooled down after being heated in the region of the engine compartment. In certain drives, in particular for cooling the stator, a cooling water jacket is formed at least partially in the region of the outer circumferential wall of the engine compartment, which jacket surrounds the circumference of the stator. The motor is arranged to be substantially above or flat on the oil level of the sump. When the oil is returned from the electric machine to the oil sump via the oil drainage system, a thermal coupling is produced between the returned oil and the cooling water jacket, in particular for cooling the oil. The housing wall which is present between the cooling water jacket and the return oil and/or the partition wall which is also provided and/or is present in particular is made of a material which conducts heat well for this purpose.

Thus, for example, other drives or drive trains for motor vehicles are also known, in which, for example, an oil sump is formed below the oil level of an oil sump, although it is located in the region of the cooling water jacket of the electric machine. In this case, the electric machine is also situated in particular substantially below the oil level of the oil sump.

Embodiments of a drive and/or drive train for a motor vehicle are also known in which the aforementioned oil sump is arranged and/or formed above a cooling water jacket of the electric machine, so that the oil has to be pumped to a corresponding level by means of a pump, which leads to a corresponding energy consumption.

Finally, drives and/or drive trains for motor vehicles are known in which the oil is cooled by means of a separate oil-water heat exchanger, as a result of which the design and production costs are increased accordingly by the separately provided oil-water heat exchanger.

JP 201-2-105457A, on which the invention is based, therefore discloses a drive for a motor vehicle, in which the housing wall of the engine compartment has a cooling jacket surrounding the stator along its circumference for additional cooling of the electric machine. The electric motor and the transmission provided here are arranged in a common housing, however in a space separate from one another, i.e. the electric motor is arranged in the engine compartment and the transmission is arranged in the transmission compartment. The cooling of the stator takes place in the form of the cooling water jacket mentioned, in other words, for the stator cooling, a cooling water line system is provided which surrounds the stator. Furthermore, an oil-based cooling system is provided, for which purpose an oil reservoir or sump is provided in the transmission chamber. The oil is used not only for cooling the transmission components but also for internal cooling of the rotor of the electric machine. The two cooling systems are thermally coupled to one another, i.e., via an oil-water heat exchanger arranged in an oil sump of the transmission chamber. The entire structure is on the one hand structurally complex and on the other hand also not space-saving and requires a corresponding installation space requirement. Furthermore, the thermal coupling of the two cooling systems via the heat exchanger present in the oil sump of the transmission chamber is disadvantageous. In particular, the heat exchanger requires a considerable amount of installation space in the gear chamber. The drive device described at the outset (from which the invention is based) is therefore not yet optimally constructed.

A drive for a motor vehicle is therefore known from JP 2013-162674A, in which the electric machine, in particular the stator of the electric machine, is also cooled by means of a surrounding cooling water jacket. The other cooling system is realized by oil cooling, wherein the oil is guided into the upper region of the stator, but the oil then essentially follows a direct path into the oil sump and is guided from there back into the upper region of the stator or from there back or pumped back into the upper region of the stator.

A specific embodiment of a drive device for a motor vehicle is therefore known or disclosed, for example, from US 2011/0309698 A1, in which a cooling system for a stator of a drive device for a motor vehicle is implemented in such a way that a circumferential wall of the engine compartment has a meandering duct path, in order to achieve, in particular, an advantageous cooling of the stator.

Other drives or drive trains known in the prior art are also not yet optimally designed or are complex in design, require a corresponding installation space and are in part expensive.

Disclosure of Invention

The object of the present invention is therefore to design and improve the drive device described above (on which the present invention is based) in such a way that the need for a large installation space of the drive train is avoided, in particular the cooling of the electric machine and/or the cost-effective cooling of the oil is achieved.

The aforementioned object is achieved by a drive for a motor vehicle having at least one electric machine, having at least one transmission, in particular a differential, and having at least one, in particular multi-part, housing, wherein the housing substantially constitutes and/or has an engine compartment and a transmission compartment, wherein, the motor is disposed in the engine compartment and the transmission is disposed in the transmission compartment, wherein the electric machine has a stator fixed to a housing and a rotor arranged radially inside the stator and a rotor shaft, wherein an oil sump is present and/or provided in the transmission chamber and, for cooling the rotor and/or the rotor shaft, oil can be conducted from the oil sump into the region of the rotor by an oil supply system and from the rotor back into the oil sump by an oil drain system, wherein, in order to cool the stator, a cooling water jacket that surrounds along a peripheral edge of the stator is formed at least partially in an area of an outer peripheral wall of the engine room, wherein the electric motor is arranged to lie substantially flat or above the oil level of the oil sump, the thermal coupling between the returned oil and the cooling water jacket is at least partially achieved when the oil flows back from the electric machine to the oil sump via the oil drainage system, in particular for cooling the oil, which has a receiving space, and the receiving space is realized by at least one housing recess which at least partially receives the oil during the return flow and by at least one separating element which is arranged separately in and/or on the housing recess and at least partially blocks or blocks the returned oil.

The basic principle of the invention is, firstly, that the thermal coupling between the return oil and the cooling jacket is at least partially achieved when the oil flows from the electric machine via the oil discharge system back into the oil sump, in particular for cooling the oil. The arrangement of the oil-water heat exchanger in the oil sump, which is known hitherto from the prior art, is thereby first dispensed with. The oil drain system furthermore has a receiving space, wherein the receiving space is realized by at least one housing groove which at least partially receives oil during the return flow and by at least one separating element which is arranged separately in and/or on the housing groove and at least partially blocks the return flow of oil. In other words, on the way of the returning oil to the oil sump, a receiving space is now provided, which is formed by the housing recess and by the separately arranged separating element. The separating element is designed such that the returning oil is at least partially blocked, in particular so that it cannot flow directly into the oil sump of the transmission chamber. On the one hand, this results in that, due to the thermal coupling between the returning oil and the cooling water jacket, which is achieved when the oil is returned from the electric machine to the oil sump via the oil drainage system, the installation space requirement can be correspondingly reduced for the reasons already mentioned above. Furthermore, the receiving space can be advantageously configured together with the separating element, which leads to further advantages which can also be explained in more detail below:

firstly, the separating element is configured to be at least partially pushed into the housing recess. The housing recess is in particular designed as a housing casting recess, i.e. during the casting process for producing the housing, the housing casting recess is cast "automatically" without great effort during the casting process of the housing and/or of the respective housing half. The housing recess, which is designed as a housing casting recess, is thus in particular formed and/or formed or respectively delimited by and/or by integrally or integrally connected housing walls. The structural complexity and the production of the housing for achieving the above-described effects can therefore be achieved in a correspondingly simple and cost-effective manner.

The separating element is made in particular of plastic. Thereby, the separation element can be manufactured inexpensively. In particular, the separating element has a comb-like structure. Due to the comb-like structure, a particularly meandering flow of the oil in the receiving space can be achieved, which in turn brings about corresponding advantages, particularly an optimized thermal coupling and heat transfer.

The partition element has at least one primary partition wall and/or a comb-shaped tab element (otherwise known as a partition element) extending from the primary partition wall. In particular, a cavity is formed in the receiving space by the web element. The separating element and/or the comb-shaped web element are/is designed and/or embodied in such a way that a meandering oil flow is achieved in the receiving space from the inflow of oil into the receiving space to the outflow of oil from the receiving space. For this purpose, the web element has or has, in particular, a recess and/or an opening, or the aforementioned chamber in the receiving space is formed by the web element accordingly. In this way, a low-cost manner and method can be used to achieve a meandering flow in the receiving space, which leads to a corresponding heat transfer between the medium of the water (i.e. in particular the cooling jacket) and the medium oil of the cooling oil, in particular for cooling the oil.

The receiving space formed by the housing recess and by the separating element is arranged and/or formed substantially directly below the circumferential wall of the engine compartment, but substantially above the differential, in particular above the cardan shaft of the differential. Due to this construction, the receiving space can be arranged and/or constructed essentially (viewed in the vertical direction) in height between the electric machine and the differential.

In particular, the receiving space and/or the housing recess are in flow connection with an oil collecting region and/or an oil discharge region of the housing cover via the first oil hole. The aforementioned housing cover particularly closes the engine compartment of the housing. In this case, the oil is conveyed from the oil sump, in particular, into the interior of the hollow rotor shaft, from where it then flows around the respective wraparound head side of the stator, in order then to be guided from there via the oil collection region and/or the oil drainage region of the housing cover and/or to the receiving space. In this case, a one-sided, but also two-sided, circulation flow on the stator winding head side can be considered, or a corresponding discharge of oil from these areas into the receiving space.

In particular, "swarf magnets" are arranged in the region of the separating element. By means of "chip magnets", metal debris can be filtered from the oil. In particular, the separating element has a region which receives the chip magnets in a partially form-fitting manner, in which region the chip magnets can then be arranged in a form-fitting manner.

It is particularly advantageous if the separating element has a base region which extends beyond the region of the housing recess. By means of the bottom region, the oil volume of the receiving space to be closed can then be increased accordingly, compared to the volume of the housing recess. Other embodiments for the aforementioned separating element are also conceivable, in particular without the aforementioned bottom region extending beyond the housing recess. In this case, for example, the separating element is designed such that the housing recess is not additionally volumetrically increased by the separating element itself, but in the simplest case is only limited or correspondingly enclosed by the volume of the housing recess.

It is particularly advantageous if the bearings of the cardan shaft of the differential can be additionally cooled by means of oil which is partially blocked in the receiving space, i.e. in particular a second oil bore leading from the housing recess to the bearings of the cardan shaft is present and/or formed. Lubrication of the respective bearings of the cardan shaft can thereby be achieved in a simplified and cost-effective manner.

A number of advantages are thereby achieved, so that the disadvantages mentioned at the outset in the prior art are correspondingly avoided.

Drawings

There are now a number of possibilities for designing and improving the drive according to the invention in an advantageous manner. For this purpose reference is first made to the claims depending on claim 1. In the following, preferred embodiments of the invention are explained in detail with the aid of the figures and the accompanying description. Shown in the drawings are:

fig. 1 shows a schematic representation of a drive for a motor vehicle, which has an electric motor, a transmission, in particular a multi-part housing, wherein the housing has an engine compartment and a transmission compartment,

fig. 2 shows a schematic view of a sectional view of the drive device from above, substantially below the engine compartment, wherein a first embodiment of a partition element arranged in a housing recess is shown,

fig. 3 shows a partial section through the drive device from fig. 1, from the opposite bottom perspective, with a separating element in a second embodiment arranged in a housing recess,

figure 4 shows an individually enlarged slightly perspective view of the separating element shown in figure 3,

fig. 5 shows a partially cut-away, slightly perspective illustration of the separating element shown in fig. 4, which is arranged in the housing recess, from an upper perspective.

Fig. 6 shows a partially cut-away schematic view of the drive device according to fig. 5 in a lateral view, with a chamber formed by a separating element, an

Fig. 7 shows the drive of fig. 3 in a simplified schematic illustration, partially cut along a further cut line, with an oil supply for the bearing of the cardan shaft.

Detailed Description

Fig. 1 to 7 show at least in part a drive device 1 for a motor vehicle not shown in detail here or a drive train for a motor vehicle (with corresponding components shown here).

In the following description, the person skilled in the art will understand that the term "which is used here to indicate a general relative orientation or positioning, which term refers to a general relative orientation or positioning, refers to the final mounting position of the drive or of the corresponding component in the motor vehicle, as used herein, such as in particular" beside "," below "," above "," upwards "," downwards "etc., unless otherwise stated, always referring to the mounting end position of the drive or drive. This also applies in particular to absolute orientation specifications, for example. "vertical" and/or "horizontal", wherein symmetry-specific terms such as "axial", "radial", etc. are to be understood in particular in the context of the respectively described units and/or components. Before the following description, this can be pointed out again:

as can be seen in particular from fig. 1,3 and 6 or fig. 7, the drive 1 has at least one electric motor 2 and at least one gear 3. In the drive 1 shown in the figures, in particular two gear units 3 are provided, in particular a differential 3a and a transmission 3b. As can also be seen from the figures, there is a housing 4 which is designed in particular in multiple parts, i.e. in particular with housing halves 4a and 4b which are explained in more detail here. Furthermore, as can be seen well from the figures, the housing 4 essentially forms an engine compartment 5 and a transmission compartment 6. The expression "substantially" means in each case, inter alia: the motor chamber 5 and the transmission chamber 6 are almost completely delimited or enclosed by respective housing walls, not shown in detail, of the housing 4, in particular of the housing halves 4a and 4b, wherein an end region of the rotor shaft 2c extends from the engine chamber 5 into the transmission chamber 6. The motor 2 is arranged in an engine compartment 5, and two transmissions 3, i.e. a differential 3a and a transmission 3b, are arranged in a transmission compartment 6.

As can be seen clearly in fig. 1 and 3, the electric machine 2 has a stator 2a fixed to the housing and a rotor 2b arranged radially inside the stator and a rotor shaft 2c. In particular, the rotor shaft 2c extends from the rotor chamber 5 partially into the transmission chamber 6 in order to transmit torque to the transmission 3b or the differential 3 a.

An oil sump 7 is present and/or provided in the transmission chamber 6, wherein, for cooling the rotor 2b and/or the rotor shaft 2c, oil can be conducted from the oil sump 7 into the region of the rotor 2b via an oil supply system not shown in detail here and from the rotor 2b back into the oil sump 7 via an oil discharge system only partially shown here.

In order to cool the stator 2a, a cooling jacket 9 surrounding along the circumference of the stator 2a is at least partially formed in the region of the circumferential wall 8 of the engine compartment 5. As is shown in particular in fig. 1,3 and 7, the cooling water jacket 9 extends along the housing wall 8, in particular in the region of the radial outer periphery of the stator 2a, wherein the cooling water jacket 9 is realized by means of hollow cylinder elements 10 arranged on the housing wall 8 and is divided into different regions or chambers 9a,9b and 9c.

As clearly shown in fig. 1,3,6 and 7, the motor 2 is arranged substantially above the oil level 7a of the oil pan 7. With regard to the arrangement of the components of the drive device 1 in height/vertical direction, the following can be briefly mentioned: fig. 1 shows that the electric machine 2 is arranged in the drive train 1 in an upper region of the drive train 1 or in an engine compartment 5 arranged there in an upper region of the housing 4. A transmission chamber 6 with a transmission 3b and a differential 3a is arranged substantially below the electric machine 2. The term "substantially" means in particular that the differential 3a is arranged or arranged in the lowermost region of the drive or in the lowermost region of the housing 4, wherein the transmission 3b is functionally arranged between the electric machine 2 and the differential 3a, and the upper region of the transmission chamber 6 "overlaps" in height when the lower region of the engine chamber 5 is oriented in height. The rotor shaft 2c extends partially from the engine compartment 5 into the transmission compartment 6 and has a drive pinion 11. The drive pinion 11 is in operative engagement with a gear wheel 12 of the transmission 3b. The propeller shaft 13 of the transmission 3b has a further gear wheel 14 which is in operative engagement with an axle drive gear wheel 15 of the differential 3 a. As can also be clearly seen in fig. 1, the

joint shafts

16 and 17 extend partially into the differential 3 a. The

cardan shafts

16 and 17 are operatively connected to corresponding drive wheels of the motor vehicle, not shown here.

The disadvantages mentioned at the outset are now avoided firstly by: when oil flows back from the electric machine 2 to the oil sump 7, in particular for cooling the oil, the thermal coupling between the return oil and the cooling water jacket 9 is at least partially achieved by way of an oil drainage system, which has an accommodation space 18, and the accommodation space 18 is achieved by way of at least one housing recess 19, which at least partially accommodates the oil during the return flow, and by way of at least one separating element 20, which is arranged separately in and/or on the housing recess 19 and at least partially blocks the return oil.

Fig. 1 shows at least in part a separating element 20, in particular fig. 2 shows a first embodiment of the separating element 20, wherein fig. 3 to 7 show a second embodiment of the separating element 20 shown in fig. 1.

The separating element 20 prevents in particular oil from flowing directly into the oil sump 7, wherein the separating element 20 is in particular designed in such a way that the separating element 20 can be pushed at least partially into the housing recess 19. The housing recess 19 is designed in particular as a housing casting recess 19a. In other words, if the housing recess 19 is designed as a housing casting recess 19a, the housing recess 19 is formed and/or designed or delimited in particular by integrally connected housing walls, not specified here in detail, which have already been produced during the casting of the housing 4 or in particular of the respective housing half 4 a.

The correspondingly formed receiving space 18 formed by the housing recess 19 and the separating element 20 provides thermal coupling between the return oil and the cooling jacket 9. The outer circumferential wall 8 is in this case made of a material, in particular an alloy, which conducts heat well. The direct outflow of oil into the oil sump 7 is therefore prevented by the housing recess 19 (viewed in height) which is arranged and/or formed between the electric machine 2 and the

universal shafts

16 and 17.

In particular, the separating element 20 is made of plastic and can therefore be produced very cost-effectively. Fig. 1 shows an embodiment of the method according to the invention. As can be clearly seen in fig. 4, the separating element 20 has a comb-like structure. The partition member 20 has at least one primary partition wall 20a and a plurality of comb-shaped tab members 20b extending from the primary partition wall 20 a. The separating element 20 and/or the comb-shaped web element 20b are designed and/or embodied in such a way, as is also apparent from fig. 5 and 6, that a meandering oil flow (indicated by arrows) is achieved in the receiving space 18 from the inflow of oil into the receiving space 18 to the outflow of oil from the receiving space 18. For this purpose, the web elements 20b have recesses and/or openings, in particular, corresponding chambers 18a,18b,18c being formed in the receiving space 18 by the web elements 20b.

The receiving space 18 formed by the housing recess 19 and the separating element 20 is arranged and/or formed substantially directly below the housing wall 8 of the engine compartment 5, but substantially above the differential 3a, in particular above the

cardan shafts

16 and 17 of the differential 3 a.

As shown in fig. 1 and 2, the accommodation space 18 and/or the housing groove 19 are in flow connection with an oil collecting region and/or an oil discharge region 22 of the housing cover 23 via the oil hole 21. From the oil sump 7, the oil is pumped via an oil supply system, in particular into the interior of the hollow rotor shaft 2c, from there onward, in particular via a winding head, not shown in detail, of the stator 2a, and then substantially collects in an oil drainage region 22, which is at least partially delimited by a housing cover 23 and flows into the receiving space 18 via the oil bores 21. In this case, the main dividing wall 20a prevents in particular oil from flowing directly into the oil sump 7. The separating element 20 has a web element 20b, by means of which web element 20b respective chambers 18a,18b,18c are formed in the receiving space, so that a meandering oil flow of the oil is achieved in the receiving space 18, since the web element 20b has correspondingly configured recesses and/or openings, not shown in detail here, for the meandering flow.

In fig. 2, 3 and 6, a chip magnet 24 is shown, wherein the expression "chip magnet" means that chips can be filtered out of the oil flow by means of the chip magnet. The chip magnets 24 are arranged in the separating element 20 in a partially form-fitting manner, for which purpose the separating element 20 has a region 20c which receives the chip magnets 24 in a partially form-fitting manner.

While fig. 2 shows a first embodiment for the separating element 20, the other figures show in particular, in particular fig. 4, a second embodiment of the separating element 20 in an enlarged view. Fig. 4 shows an enlarged view. As can be seen particularly clearly in fig. 4, and also in fig. 3,5 and 7, the separating element 20 shown enlarged in fig. 4 has a bottom region 20d which extends beyond the region of the housing recess 19. By means of this bottom region 20d, the oil volume of the receiving space 18 to be divided-compared to the volume of the housing recess 19-can be correspondingly increased. In other words, the bottom region of the housing recess 19 is again "lengthened"/extended by means of the separating element 20 with the corresponding bottom region 20d. This is apparent from fig. 3,4 and 5, the separating element 20 in its second preferred embodiment is configured or has a base region 20d here.

Finally, the bearings 25 of the cardan shaft 16 of the differential 3a can be cooled by means of oil which is partially blocked in the accommodating space 18. For this purpose, there is or is configured a further oil bore 26 which leads from the housing recess 19 to the bearing 25 of the cardan shaft 16, said further oil bore being shown well in fig. 7.

By means of the receiving space 18, in particular the main partition wall 20a of the partition element 20, rapid outflow of oil into the oil sump 7 is prevented and the residence time in the region below the cooling water jacket 9 is increased. The aforementioned effect is additionally reinforced by the comb-like structure of the separating element 20, whereby the oil is guided or guided in a meandering manner in the receiving space 18. As a result, cost-effective oil cooling above the oil surface 7a of the oil pan 7 is achieved by means of the cooling water jacket 9 for oil. The housing recess 19, which is designed as a housing casting recess 19a, can be produced cost-effectively and simply during the casting of the housing 4 and can be designed to have the desired shape. The separating element 20 can be produced cost-effectively as a plastic part, wherein the web element 20b can also be produced cost-effectively, in particular in an injection molding process. Finally, the magnets 24, in particular the chip magnets, can be arranged or, in particular, can be integrated in a form-fitting manner in the respective region 20c of the separating element 20, with the chip magnets then being able to filter out chips from the oil flow. In particular, the main dividing wall 20a extending in the region 20c has a recess, not shown in detail, through which oil located in the receiving space 18 or the housing recess 19 can flow down into the oil sump 7.

One and/or more bearings 25 or bearings 25 of the cardan shaft 16 can be lubricated and/or cooled by means of the receiving space 18.

Preferably, the electric machine 2 is arranged coaxially or flat, so that the oil guide or the oil drainage system shown at least in part here can be implemented accordingly.

In particular, no additional water connections and/or no additional separate oil pump for conducting oil to the oil-water heat exchanger are required, apart from the water connections in the inlet and outlet (in particular for filling the chambers 9a,9b,9c with water).

The disadvantages mentioned at the outset are thereby avoided and corresponding advantages are achieved.

List of reference numerals

1. Driving device

2. Electric machine

2a stator

2b rotor

2c rotor shaft

3. Transmission device

3a differential mechanism

3b speed changer

4. Shell body

4a housing half

4b half-shell

5. Engine room

6. Transmission device chamber

7. Oil pan

7a oil level

8. Outer peripheral wall

9. Cooling water jacket

Region 9a, chamber

Region 9b, chamber

Region 9c, chamber

10. Hollow cylindrical element

11. Shaft drive pinion

12. Gear wheel

13. Transmission shaft

14. Gear wheel

15. Driving gear

16 cardan shaft

17 cardan shaft

18. Accommodation space

18a chamber

18b chamber

18c chamber

19. Shell groove

19a housing casting groove

20. Separating element

20a primary partition wall

20b tab element

20c area for chip magnets

20d bottom area

21. Oil hole

22. Oil discharge area

23. Shell cover

24. Chip magnet

25. Bearing assembly

26. And an oil hole.

Claims

1. A drive device (1) for a motor vehicle, having at least one electric machine (2), having at least one transmission (3), in particular a differential (3 a), and having at least one housing (4), in particular of multi-part construction, wherein the housing (4) substantially forms and/or has an engine compartment (5) and a transmission compartment (6), wherein the electric machine (2) is arranged in the engine compartment (5) and the transmission (3) is arranged in the transmission compartment (6), wherein the electric machine (2) has a stator (2 a) fixed to the housing and a rotor (2 b) arranged radially inside the stator (2 a) and a rotor shaft (2 c), wherein an oil sump (7) is present and/or provided in the transmission compartment (6) and, for cooling the rotor (2 b) and/or the rotor shaft (2 c), oil can be conducted from the oil sump (7) into the region of the rotor (2 b) by means of an oil supply system and, for cooling the rotor (2 b) and/or the rotor shaft (2 c), wherein oil is conducted from the oil sump (7) back into the region of the stator (2 b) along a peripheral wall (9) of the stator compartment (5), wherein the electric machine (2) is arranged to lie substantially above an oil surface (7 a) of the oil sump (7), characterized in that, when the oil flows back from the electric machine (2) to the oil sump (7) via the oil drain system, a thermal coupling between the returning oil and the cooling water jacket (9) is at least partially achieved, in particular for cooling the oil, the oil drain system having a receiving space (18), and the receiving space (18) being achieved by at least one housing groove (19) which at least partially receives the oil during the return flow and by at least one separating element (20) which is arranged separately in and/or on the housing groove (19) and at least partially blocks the returning oil.

2. The drive device according to claim 1, characterized in that the separating element (20) can be pushed at least partially into the housing recess (19) and/or the housing recess (19) is configured as a housing casting recess (19 a), in particular defined by housing walls which are integrally connected to one another.

3. The drive device according to claim 1 or 2, characterized in that the separation element (20) is made of plastic and/or has a comb-like structure.

4. The drive device according to one of the preceding claims, characterized in that the partition element (20) has at least one primary partition wall (20 a) and/or a comb-shaped tab element (20 b) extending from the primary partition wall (20 a).

5. The drive device according to one of the preceding claims, characterized in that the separating element (20) and/or the comb-shaped web element (20 b) are designed and/or embodied such that a meandering oil flow is achieved within the receiving space (18) from the inflow of oil into the receiving space (18) to the outflow of oil from the receiving space (18), in particular the web element (20 b) has a recess and/or an opening for this purpose and/or a chamber (18a, 18b, 18c) is formed within the receiving space (18) by the web element (20 b).

6. The drive device according to any one of the preceding claims, characterized in that the receiving space (18) formed by the housing recess (19) and the partition element (20) is arranged and/or formed substantially directly below the peripheral wall (8) of the engine compartment (5), but substantially above the differential (3 a), in particular above the joint shafts (16, 17) of the differential (3 a).

7. The drive arrangement according to one of the preceding claims, characterized in that the receiving space (18) and/or the housing groove (19) are in flow connection with an oil collecting region and/or an oil discharge region (22) of a housing cover (23) via oil bores (26) and/or the receiving space (18) and/or the housing groove (19) are in flow connection with the respective wraparound head side of the stator (2 a).

8. The drive device according to one of the preceding claims, characterized in that a chip magnet (24) is arranged in the region of the separating element (20), in particular the separating element (20) has a region (20 c) which receives the chip magnet (24) in a partially form-fitting manner.

9. The drive device according to any one of the preceding claims, characterized in that the separating element (20) has a bottom region (20 d) which extends beyond the region of the housing recess (19), by means of which bottom region (20 d) the oil volume of the receiving space (18) to be separated can be increased compared to the volume of the housing recess (19).

10. Drive arrangement according to any one of the preceding claims, characterized in that the bearings (25) of the cardan shafts (16, 17) of the differential (3 a) can be cooled by means of oil which is partially blocked in the receiving space (18), in particular oil bores (26) leading from the housing recess (19) to the bearings (25) of the cardan shafts (16, 17) being present and/or configured.