Motor-gearbox assembly

Abstract

The invention relates to a motor-gearbox assembly (1) for an electrically driven motor vehicle, comprising at least one electric traction machine (5), at least one gearbox arrangement (7) which is operatively connected to the electric traction machine (5), and at least two wheel drive shafts (3) which are arranged coaxially with a drive axle (4) of the motor vehicle and are operatively connected to the gearbox arrangement (7). The at least one electric traction machine (5) and the at least one gearbox arrangement (7) are cooled and / or lubricated by means of a liquid cooling and / or lubricating medium. Separate circuits for the liquid cooling and / or lubricating medium are provided for cooling and / or lubricating the at least one electric traction machine (5) and for cooling and / or lubricating the at least one gearbox arrangement (7).

Description

[0001] Motor gearbox arrangement

[0002] The invention relates to a motor transmission arrangement for an electrically powered motor vehicle, in particular for a commercial vehicle, for example a truck, a semi-trailer tractor, a bus or the like, according to the preamble of the independent claim.

[0003] As road transport becomes increasingly electrified, heavy vehicles, such as commercial vehicles like trucks, tractor units, buses, and the like, are also being equipped with electric drives. These drives typically feature one or more electric traction motors, whose output shaft is operatively connected via a gearbox to two wheel drive shafts arranged coaxially with a drive axle of the vehicle. The electric traction motor is usually designed as an electric motor, for example, a permanent magnet synchronous motor. Since an electric motor heats up during operation, this heat must be dissipated to prevent damage from overheating.While air-cooled electric motors exist in the prior art, liquid-cooled electric motors have become the standard in this application to ensure reliable heat dissipation in all operating conditions. An advantageous embodiment of this liquid cooling system uses a liquid cooling and / or lubricating medium with dielectric properties, particularly an oil, thus eliminating the need for complex insulation of the electric motor components to be cooled.

[0004] From DE 10 2021 132 409 A1, a generic motor-gear assembly is known, comprising at least one, specifically two, electric traction motors, a transmission unit operatively connected to the electric traction motor, and two wheel drive shafts arranged coaxially with a drive axle of the motor vehicle and operatively connected to the transmission unit. In the embodiment described in this publication, the dielectric, liquid cooling and / or lubricating medium, which is oil, for the electric traction motors and the transmission unit is circulated in a common circuit. While this arrangement appears simple in principle, it cannot optimally ensure the cooling and / or lubrication of the components to be cooled or lubricated in all operating conditions of the motor-gear assembly.

[0005] The present invention is based on the objective of creating a motor-gearbox arrangement with improved cooling and / or lubrication of the components to be cooled or lubricated.

[0006] According to the invention, separate circuits for the liquid cooling and / or lubricating medium are provided for the cooling and / or lubrication of the at least one electric traction machine and for the cooling and / or lubrication of the at least one transmission device.

[0007] In an advantageous embodiment of the invention, the liquid cooling and / or lubricating medium can be in the form of oil.

[0008] Liquid oil is generally well-suited for both cooling and lubricating the relevant components of both the electric traction motor and the transmission system. However, the requirements for optimal cooling and lubrication differ between the electric traction motor and the transmission system. For example, the oil in the transmission system's circuit should contain little to no air, whereas a higher air content may even be desirable in the electric traction motor's circuit. Furthermore, oil can age more rapidly when it comes into contact with the copper components in the electric traction motor, which can lead to a deterioration of its lubricating properties and thus necessitates relatively short oil change intervals for the overall relatively large volume of oil.

[0009] By assigning separate circuits to the electric traction machine and the transmission unit according to the invention, the aforementioned conflicts of objectives and disadvantages are avoided, and all relevant components of the motor-gear assembly can thus be optimally cooled and / or lubricated.

[0010] For example, the cooling effect for the relevant components of the electric traction machine can be optimized as follows:

[0011] In an advantageous embodiment of the invention, a media supply and / or mixing device is arranged in the circuit provided for cooling and / or lubricating the electric traction machine. This device generates a mixture of the liquid cooling and / or lubricating medium and air. This mixture, hereinafter referred to simply as "oil mist," can be pressurized and swirled by a conveying device, thus enabling it to optimally reach all points of the components of the electric traction machine to be cooled, for example, between the windings of the winding heads and into cooling channels that may be arranged in the stator laminations.

[0012] Furthermore, in a further advantageous embodiment of the invention, a media removal and / or phase separation device can be arranged in the circuit provided for cooling and / or lubricating the electric traction machine, which separates the oil mist back into its gaseous and liquid components, since this separation is advantageous outside the areas of the electric traction machine to be cooled, for example, to be able to cool the then liquid oil by means of a heat exchanger and to pump it.

[0013] In a further advantageous embodiment of the invention, the circuit provided for cooling and / or lubricating the electric traction machine may also include a media storage tank assembly, which has at least one storage chamber for storing the liquid cooling and / or lubricating medium. The media storage tank assembly may also include a storage chamber for air, wherein, in a preferred embodiment, a storage chamber common to the liquid cooling and / or lubricating medium and the air is provided. Furthermore, in a further advantageous embodiment of the invention, the circuit provided for cooling and / or lubricating the electric traction machine may also include a media treatment and / or conveying module.The media handling and / or conveying module may include a pump for conveying the liquid cooling and / or lubricating medium and / or a heat exchanger for cooling the liquid cooling and / or lubricating medium and / or a filter for filtering the liquid cooling and / or lubricating medium.

[0014] In a further advantageous embodiment of the invention, a similar, advantageously even identically designed, separate media treatment and / or conveying module can be arranged in the circuit for cooling and / or lubrication of the at least one transmission device.

[0015] In a further advantageous embodiment of the invention, the primary circuits of the heat exchangers of the individual media treatment and / or conveying modules can be combined and connected together to a central vehicle-side cooling system.

[0016] Because all circuits for the liquid cooling and / or lubricating medium, and advantageously also for the air added to the liquid cooling and / or lubricating medium in sections, are designed to be closed, the number of external fluid interfaces of the motor-gearbox arrangement is significantly reduced, and external oil interfaces are eliminated entirely.

[0017] In a further advantageous embodiment of the invention, functional components and / or functional areas of the electric traction machine can be formed by the housing of the motor-gear assembly.

[0018] For example, the electric traction machine can, as a functional component, comprise an electric motor assembly with a stator and a rotor rotatably charged within the stator about an axis of rotation. The stator can be surrounded by a stator sleeve, and in an advantageous embodiment of the invention, the stator sleeve can be arranged, at least partially, in a corresponding receiving area of ​​the housing of the motor-gear assembly.

[0019] In a further advantageous embodiment of the invention, at least one bearing of the rotor can alternatively or additionally be arranged in a bearing seat formed in the housing of the motor gearbox arrangement.

[0020] In further advantageous embodiments of the invention, media channels and / or media chambers and / or functional components of the media supply and / or mixing device and / or the media discharge and / or phase separation device and / or the media storage container device and / or the media treatment and / or conveying module can be formed at least section by section through the housing of the motor gear arrangement.

[0021] In a further advantageous embodiment of the invention, the at least one electric traction motor and the at least one transmission unit can be arranged one behind the other in the longitudinal direction of the vehicle. In a multi-motor motor-transmission arrangement, the electric traction motors can preferably be arranged in the end regions of the housing of the motor-transmission arrangement, and the wheel drive shafts centrally, with the transmission units being arranged between the electric traction motors and the central wheel drive shafts. This results in a narrow, elongated shape for the motor-transmission arrangement, allowing it to fit optimally into the installation space defined between the rear wheel suspensions of a commercial vehicle, which is therefore limited in space. This installation space can, in particular, be the installation space of a standard rear axle assembly of a commercial vehicle powered by an internal combustion engine.

[0022] Preferred embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar or functionally identical components.

[0023] Here, Fig. 1 shows a motor gear arrangement according to the invention in oblique view;

[0024] Fig. 2 shows a schematic representation of the functional areas of an electric traction machine arranged in the motor-gearbox arrangement according to Fig. 1;

[0025] Fig. 3 shows a vertical section through the motor-gear assembly according to Fig. 1, wherein the section plane is perpendicular to the longitudinal direction of the vehicle in the area of ​​the axis of rotation of one of the electric traction machines.

[0026] Fig. 1 shows an embodiment of the motor-gear assembly 1 according to the invention. The motor-gear assembly 1 has a housing 2 which has a substantially cuboid shape, extending elongated in the longitudinal direction R of the vehicle. Due to this narrow shape, the housing 2 is ideally suited for installation between the rear wheel suspensions of a commercial vehicle, which typically have bulky suspension components such as air springs, coil springs, or leaf springs.

[0027] Coaxial to the drive axle 4 of the vehicle, a wheel drive shaft 3 extends from the housing 2 on both sides, to which a drive wheel of the vehicle can be mounted.

[0028] Housing 2 encloses and houses the components described below:

[0029] Two electric traction motors 5 are arranged at each end in the longitudinal direction R of the vehicle. The axes of rotation 6 of the rotors of the electric traction motors 5 are arranged parallel to the drive axle 4.

[0030] A transmission unit 7 is arranged between the electric traction motors 5 and the central drive axle 4. The transmission unit 7 has one reduction gear 8 for each electric traction motor 5 and a differential gear 9 located centrally in the area of ​​the drive axle 4 between them. In the illustrated embodiment, the reduction gears 8 are designed as spur gears and serve to reduce the (higher) rotational speed of the electric traction motors 5 to a different (lower) rotational speed of the wheel drive shafts 3. The reduction gears 8 can also have several, for example two, switching stages, i.e., be switchable between several different, for example two, reduction ratios.

[0031] In contrast to the embodiment shown, it is also conceivable to use other suitable designs for the reduction gear 8, for example planetary gears.

[0032] The centrally arranged differential gear 9 serves - in a manner known per se - to compensate for different rotational speeds of the vehicle drive wheels mounted on the wheel drive shafts 3, for example when the vehicle is cornering, if the inner wheel has a lower rotational speed than the outer wheel.

[0033] In contrast to the embodiment shown, it is also conceivable to allow the reduction gears 8 to act directly on the wheel drive shafts 3, i.e. without the interposition of a differential gear 9, for example by having each electric traction motor 5 drive one of the wheel drive shafts 3 in a two-motor arrangement.

[0034] Separate circuits for the liquid cooling and / or lubricating medium are provided for the cooling and / or lubrication of the electric traction motors 5 and for the cooling and / or lubrication of the at least one gearbox 7.

[0035] Visible in this view, three media treatment and / or conveying modules 10, 12 are arranged on the outside of the housing 2. Two of these media treatment and / or conveying modules 10 are each assigned to an electric traction motor 5, and the third media treatment and / or conveying module 12 is assigned to the transmission unit 7. In this view, several oil lines 13 are visible, which extend from the third media treatment and / or conveying module 12 and lead to some of the parts of the transmission unit 7 requiring lubrication. Not visible in this view are other oil lines that lead from the parts of the transmission unit 7 requiring lubrication back to the third media treatment and / or conveying module 12.

[0036] In this view, two storage spaces 11 are also visible in addition to the two circuits for the liquid cooling and / or lubricating medium assigned to the electric traction machines 5, which in the illustrated embodiment are each arranged under the electric traction machines 5.

[0037] In contrast to the embodiment shown, it is also conceivable to arrange the storage spaces 11 at other suitable positions of the motor gear assembly 1.

[0038] In contrast to the illustrated embodiment, it is also conceivable to arrange only a single electric traction motor 5 or more than two electric traction motors 5 in the motor-gearbox assembly 1. In the latter case, for example, it is conceivable that two electric traction motors 5 are arranged on each side of the gearbox assembly in a tandem arrangement, i.e., one behind the other in the longitudinal direction R of the vehicle with parallel axes of rotation 6 or side by side with coaxial axes of rotation 6.

[0039] Furthermore, it is also conceivable – also in contrast to the illustrated embodiment – ​​to arrange the axis of rotation 6 of the at least one electric traction machine 5 not perpendicular, but parallel or inclined to the longitudinal direction R of the vehicle, with the interposition of a suitable angle gear.

[0040] Further details of the circuits associated with the electric traction machines 5 are shown in Figures 2 and 3 and are described below. Figure 2 shows a schematic representation of the functional areas of an electric traction machine 5 arranged in the motor-gearbox assembly 1, as well as the circuit provided for its cooling and / or lubrication.

[0041] A central functional area of ​​the electric traction machine 5 is the actual electric motor assembly 14, which – not shown here, but in a manner known per se – has a rotor rotatably mounted within a stator. The electric motor assembly 14 can, for example, be designed as a permanent magnet synchronous motor, but other designs of the electric motor assembly 14 are also conceivable in principle.

[0042] Adjoining the end face of the electric motor assembly 14 is a media supply and / or mixing device 15 as a further functional area. This device has an oil inlet 18 and an air inlet 19, wherein the oil inlet 18 is arranged coaxially to the axis of rotation 6 and the air inlet 19 is arranged annularly around the oil inlet 18. The liquid cooling and / or lubricating medium, preferably oil, and the air mix within the electric motor assembly 14 after passing through the oil inlet 18 or the air inlet 19, respectively, to form a mixture, hereinafter referred to simply as "oil mist".This oil mist can be pressurized and swirled by a conveying device and can thus optimally reach all parts of the components of the electric motor assembly 14 that need to be cooled, for example between the windings of the winding heads and into cooling channels which can be arranged in the stator laminations, so that the areas of the stator windings embedded in the stator laminations can also be effectively cooled.

[0043] In the other, opposite end face of the electric motor assembly 14, a media discharge and / or phase separation device 16 is arranged as a further functional area. The oil mist, after passing through all components of the electric motor assembly 14 to be cooled, flows into this device via an overflow channel 22. In a phase separation chamber 23 arranged annularly around the shaft of the electric motor assembly 14, devices are provided – not shown here – such as sieves, baffles, or the like, which effect phase separation of the oil mist flowing circularly in the phase separation chamber 23 into its liquid and gaseous components. The cooling and / or lubricating medium separated from the oil mist, i.e., now liquid again, flows down by gravity into a collection chamber 24 located at the bottom of the media discharge and / or phase separation device 16.

[0044] In the lower section of the electric motor assembly 14, a media storage tank 17 is arranged as a further functional area. This includes a storage chamber 11 for the liquid cooling and / or lubricating medium, with a space for air located above the liquid level of the liquid cooling and / or lubricating medium. The liquid and gaseous components of the oil mist, separated in the media discharge and / or phase separation unit 16, pass from the collection chamber 24 of the media discharge and / or phase separation unit 16 into the media storage tank 17 via one or more overflow channels 25 and are available there for further circulation.

[0045] The electric traction machine 5 is associated with a media handling and / or conveying module 10. In the illustrated embodiment, this module is arranged and attached as a separate component on the outside of the housing 2 of the motor-gear assembly 1 and essentially comprises a pump 29 for conveying the liquid cooling and / or lubricating medium, a heat exchanger 30 for cooling the liquid cooling and / or lubricating medium, and a filter 31 for filtering the liquid cooling and / or lubricating medium. The media handling and / or conveying module 10 is connected to the liquid cooling and / or lubricating medium circuit of the electric traction machine 5 via an inlet line 27 and a drain line 28. Through the drain line 28, the pump 29 draws liquid cooling and / or lubricating medium located in the storage chamber 11 into the media handling and / or conveying module 10.There, it flows through the heat exchanger 30, where it can transfer its heat to the primary circuit of a central vehicle cooling system (not shown here), and through the filter 31, where impurities are removed from the liquid cooling and / or lubricating medium. The cooled and cleaned liquid cooling and / or lubricating medium then enters the oil inlet 18 of the media supply and / or mixing device 15 via the inlet line 27.

[0046] In contrast to the embodiment shown, it is also conceivable not to design the media handling and / or conveying module 10 as a separate component mounted outside the housing 2 of the motor gear assembly 1, but to arrange it at least partially and / or sectionally integrated within the housing 2 of the motor gear assembly 1 with its components and lines described above.

[0047] The air inlet 19 of the media supply and / or mixing device 15 is connected via an air duct 21 to the storage space 11 of the media storage container device 17, so that a closed circuit also exists for the air.

[0048] The cooling of the electric traction motor 5 described above, using a mixture of liquid cooling and / or lubricating medium and air, requires that the air supplied to the liquid cooling and / or lubricating medium for mixture formation is sufficiently dry. If moisture from the supplied air were to enter the liquid cooling and / or lubricating medium, it would lose its lubricating properties above a certain water content, making a closed air circuit preferable.

[0049] In alternative embodiments – not shown here – the air circuit can also be designed as an open circuit, meaning that the portion of air flowing through the electric traction motor 5 can be drawn from the ambient air and then released back into the environment. For this, however, dehumidification devices are absolutely necessary to remove the water content from the supplied ambient air. Furthermore, filter devices are also required to filter out impurities during the inflow and components of the liquid cooling and / or lubricating medium during the outflow from the supplied ambient air.Alternatively or additionally, it is also conceivable that the air circuit includes further air channels – not shown here – which, for example, run directly between the media supply and / or mixing device 15 and the media discharge and / or phase separation device 16, bypassing the electric motor unit 14, and allow air to flow between the aforementioned functional units if the pressure conditions in the overall arrangement require this.

[0050] Alternatively or additionally, a pressure equalization device – not shown here – such as a pressure relief valve, can be provided in the air circuit, which allows air to flow in or out of the outside environment as needed. Here too, it is advisable to install a filter at the inlet and outlet points and a dehumidification device at the outlet points.

[0051] Fig. 3 shows a vertical section through the motor-gear assembly 1 according to Fig. 1, wherein the section plane is perpendicular to the longitudinal direction of the vehicle R in the region of the axis of rotation 6 of one of the electric traction motors 5. The functional areas of the electric traction motor 5 arranged in the motor-gear assembly 1, as described above and shown in Fig. 2, are depicted in this view in their actual installation position within the motor-gear assembly 1.

[0052] The following primarily describes aspects that are not yet apparent from the schematic representation according to Fig. 2 and are not yet described in the accompanying description.

[0053] The housing 2 of the motor-gear assembly 1 has two load-bearing housing halves 32, 33, wherein the first housing half 32 (left in the drawing) and the second housing half 33 (right in the drawing) can be joined together along a butt plane 34 extending vertically in the longitudinal direction R of the vehicle and, when joined, enclose an interior space of the housing 2. The stator 38 of the central functional area of ​​the electric traction machine 5, designed as an electric motor unit 14, is surrounded by a stator sleeve 39. This sleeve is received and held in its left-hand area (in the drawing) by a corresponding recess in the inner wall of the first housing half 32. This eliminates the need for a separate electric motor housing for the electric traction machine 5, which would have been necessary with its individual arrangement.

[0054] The stator 38 essentially consists – in a manner known per se – of a laminated core and embedded stator windings – not visible in this section plane – of which the winding heads 44 protruding from the laminated core at the end face are recognizable in this view.

[0055] The central longitudinal axis of the stator 38 is arranged coaxially with the axis of rotation 6 of the rotor 37, which is rotatably mounted within the stator 38. The rotor 37 essentially consists – in a manner known per se – of a laminated core and permanent magnets embedded therein.

[0056] In a different embodiment – ​​not shown here – for example an electrically excited synchronous machine, it is also conceivable to arrange electrical excitation windings in the rotor, which are electrically connected to an excitation circuit of the electric traction machine 5 via a slip ring device and / or via an inductive rotary transformer device.

[0057] The lamination stack of the rotor 37 is arranged on a rotor shaft designed as a hollow shaft 35. The rotor shaft is rotatably mounted in bearings 36, with the bearing 36 on the left in the drawing being arranged in a bearing seat of the left housing half 32 of the housing 2 of the motor-gear assembly 1.

[0058] At one end of the hollow shaft 35 is the oil inlet 18, already schematically indicated in Fig. 2, and, coaxially ring-shaped around it, the air inlet 19, also schematically indicated there. The media flowing into the interior 40 of the hollow shaft 35 through these inlets—specifically, the liquid cooling and / or lubricating medium, preferably oil, and air—mix in this interior 40 to form the oil mist described above. The centrifugal force occurring when the rotor 37 rotates wets the inner surface of the hollow shaft 40 with a film of liquid, thereby cooling the laminated core of the rotor 37 located on the outer surface of the hollow shaft 40 and thus also the components embedded in the laminated core.

[0059] In the areas adjoining the end faces of the rotor stack 37, the hollow shaft 35 has overflow openings 41 through which the oil mist located in the interior 40 passes into swirl chambers 42, which are each ring-shaped and are located at both end faces of the stator 38 in the area of ​​its winding heads 44.

[0060] This oil mist flow is driven by conveying devices 43, which are arranged on both end faces of the rotor 37 and are designed as so-called "impellers," i.e., they have blades which, when the rotor 37 rotates, drive the oil mist flow and cause even finer atomization of the oil mist. This allows the oil mist to reach all points of the components of the electric traction machine 5 that need to be cooled, for example, between the windings of the winding heads 44.

[0061] Cooling channels 45 are arranged in and / or on the stator core of the stator 38. These channels allow the oil mist to flow between the two swirl chambers 42 through the stator 38, from left to right in the illustrated embodiment, thus cooling the stator core and, consequently, the stator windings embedded within it. The illustrated sectional view shows two cooling channels 45 running along the edges between the stator core of the stator 38 and the stator sleeve 39. Alternatively or additionally—for example, in other sectional views not shown here—further cooling channels 45 can run within the stator core, advantageously near the slots of the stator windings and / or even within these winding slots themselves, thereby achieving optimal cooling for the components of the stator 38.After passing through the areas of the electric motor assembly 14 to be cooled, the oil mist is finally driven, as already described in detail in the schematic representation according to Fig. 2, from the right swirl chamber 42 through an overflow channel 22 into a phase separation chamber 23 of the media discharge and / or phase separation device 16, and separated there into its liquid and gaseous components. The sectional view according to Fig. 3 also shows that an outer wall of the phase separation chamber 23 is integrally formed by a wall of the right housing half 33 of the housing 2.

[0062] This eliminates the need for a separate housing for the media discharge and / or phase separation device 16, in particular for its phase separation chamber 23, which would have been necessary with a single arrangement of the electric traction machine 5.

[0063] The same applies to the storage space 11 of the media storage container device 17, because the storage space 11 is integrated in one piece by correspondingly shaped sections of the left and right housing halves 32, 33, which also eliminates the need for a separate housing for the storage space, which would have been necessary with a single arrangement of the electric traction machine 5.

[0064] The air duct 21, which leads from the storage chamber 11 to the air inlet 19, is also arranged, at least in part, as a single unit within the left housing half 32. Another section of this air duct 21 is also integrally integrated into a further housing part 46, which can be mounted in a recess of the left housing half 32 and also holds the oil inlet 18. Reference numeral list

[0065] Motor gearbox arrangement

[0066] Housing

[0067] Wheel drive shaft

[0068] drive axle electric traction machine

[0069] axis of rotation

[0070] Gearbox

[0071] Reduction gearbox

[0072] Differential gear

[0073] Media treatment and / or support module

[0074] Storage space

[0075] Media treatment and / or support module

[0076] Oil pipeline

[0077] Electric motor device

[0078] Media supply and / or mixing device

[0079] Media removal and / or phase separation device

[0080] Media storage container system

[0081] Oil ingress

[0082] Air intake

[0083] oil channel

[0084] air duct

[0085] Overflow channel

[0086] Phase separation chamber

[0087] Collection chamber

[0088] Overflow channel

[0089] oil channel

[0090] Inlet pipe

[0091] Procedure management

[0092] pump

[0093] Heat exchanger 1 Filter 2 Housing half 3 Housing half 4 Impact plane 5 Hollow shaft 6 Bearing 7 Rotor 8 Stator

[0094] 39 Stator sleeve 0 Interior 1 Overflow opening

[0095] 42 Swirl chamber

[0096] 43 Funding facility

[0097] 44 Winding head

[0098] 45 Cooling channel

[0099] 46 Housing part

[0100] R Vehicle longitudinal direction

Claims

Claims 1. Motor-gear assembly (1) for an electrically powered motor vehicle, comprising at least one electric traction machine (5), at least one transmission unit (7) operatively connected to the electric traction machine (5), and at least two wheel drive shafts (3) arranged coaxially with a drive axle (4) of the motor vehicle and operatively connected to the transmission unit (7), wherein the cooling and / or lubrication of the at least one electric traction machine (5) and the at least one transmission unit (7) is carried out by means of a liquid cooling and / or lubricating medium, characterized in that separate circuits for the liquid cooling and / or lubricating medium are provided for the cooling and / or lubrication of the at least one electric traction machine (5) and for the cooling and / or lubrication of the at least one transmission unit (7).

2. Motor transmission arrangement (1 ) according to claim 1 , characterized in that the liquid cooling and / or lubricating medium is designed as oil.

3. Motor transmission arrangement (1 ) according to claim 1 or 2, characterized in that a media supply and / or mixing device (15) is arranged in the circuit provided for cooling and / or lubricating the electric traction machine (5), which generates a mixture of the liquid cooling and / or lubricating medium and air.

4. Motor gear arrangement (1 ) according to claim 3, characterized in that the components to be cooled of the electric traction machine (5), in particular a rotor and a stator of an electric motor device (14), can be exposed to the mixture of the liquid cooling and / or lubricating medium and air.

5. Motor gear arrangement (1 ) according to claim 3 or 4, characterized in that a media discharge and / or phase separation device (16) is arranged in the circuit provided for cooling and / or lubricating the electric traction machine (5), which separates the mixture of the liquid cooling and / or lubricating medium and air into its gaseous and liquid components.

6. Motor gear arrangement (1 ) according to one of the preceding claims, characterized in that a media storage container device (17) is arranged in the circuit provided for cooling and / or lubricating the electric traction machine (5), which has at least one storage space (11 ) for storing the liquid cooling and / or lubricating medium.

7. Motor gear arrangement (1 ) according to one of claims 3 to 6, characterized in that the media supply and / or mixing device (15) and / or the electric motor device (14) and / or the media discharge and / or phase separation device (16) and / or the media storage container device (17) are arranged within the housing (2) of the motor gear arrangement (1 ).

8. Motor gear arrangement (1 ) according to one of the preceding claims, characterized in that a media treatment and / or conveying module (10) is arranged in the circuit provided for cooling and / or lubricating the electric traction machine (5).

9. Motor-gear assembly (1) according to claim 8, characterized in that the media treatment and / or conveying module (10) includes a pump (29) for conveying the liquid cooling and / or lubricating medium, a heat exchanger (30) for cooling the liquid includes a cooling and / or lubricating medium and a filter (31) for filtering the liquid cooling and / or lubricating medium.

10. Motor gear arrangement (1 ) according to one of the preceding claims, characterized in that a media treatment and / or conveying module (12) is arranged in the circuit for cooling and / or lubrication of the at least one gear unit (7).

11. Motor transmission arrangement (1) according to claim 10, characterized in that the media treatment and / or conveying module (12) comprises a pump (29) for conveying the liquid cooling and / or lubricating medium, a heat exchanger (30) for cooling the liquid cooling and / or lubricating medium and a filter (31) for filtering the liquid cooling and / or lubricating medium.

12. Motor transmission arrangement (1 ) according to one of the preceding claims, characterized in that the at least one electric traction machine (5) and the at least one transmission device (7) are arranged one behind the other in the longitudinal direction (R) of the vehicle.

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