DE102018220496A1 - Common housing for electric machine and transmission - Google Patents

Abstract

The invention relates to a common housing (14) for an electric machine (20) and a transmission (26). The common housing (14) comprises a water jacket cooling (30) for an electric machine (20) with cooling channels (24, 72) running in the common housing (14). The water jacket cooling (30) extends in the common housing (14) to below an oil sump (44) of the transmission (26), which is driven by the electric machine (20), the electric machine rotor (28) of which has at least one cooling channel (68 ) includes.

Description

Technical field

The invention relates to a common housing for parts of an electric machine and a transmission, the electric machine having a water jacket or oil jacket cooling. Furthermore, the invention relates to the use of the common housing for an electric machine and a transmission within an electric axle module for a vehicle having at least one electric machine and / or at least one transmission.

State of the art

With electric drives available and used today, the individual components such as power electronics, electric machine and gearbox are designed with independent internal cooling systems with the cooling media water, oil and / or air. The independent internal cooling systems are usually connected via external piping.

Due to installation space limitations when installing electric axles, for example on the rear axle in the vehicle, the thermal and acoustic requirements become significantly more stringent, for example when installing the electric axle in the area of the rear bench seat and in the trunk, while at the same time increasing performance and reducing weight to increase the range of the at least a vehicle having an electric machine is sought.

If the required temperature requirements cannot be met in this area of tension, additional mechanical or electrically operated oil pumps and heat exchangers are used, which, however, again require limited installation space and, on the other hand, entail additional costs.

Presentation of the invention

According to the invention, a common housing for an electric machine and a transmission is proposed, with water jacket cooling for the electric machine and with cooling channels running in the common housing. The water jacket cooling extends in the common housing at least up to an oil sump of the transmission, which is driven by the electric machine, the electric machine shaft of which comprises at least one cooling channel.

The solution proposed according to the invention can advantageously achieve that the water jacket cooling is not used alone for the at least one electric machine, but that the water jacket cooling also cools parts of the gearbox area of at least one gearbox of the common housing for the electric machine and gearbox. If the shaft of the electric machine is provided with at least one additional cooling channel, a possible continuous output of the electric drive system can be increased. For a rotor cooling both oil and a cooling medium such. B. water can be used.

In an advantageous manner, in the common housing proposed according to the invention for at least one electric machine and at least one transmission, the at least one cooling channel is guided into the oil sump of the transmission and connected to an oil cooling system via a rotating union. The oil cooling of the electric machine shaft is connected by means of a mechanical or electrical oil pump. This sucks oil from the oil sump, for example, and directs it to a rotating union. Via the oil pump, all necessary points in the transmission, such as. B. bearings and gears supplied with lubricant.

According to the invention, the common housing for an electric machine and a transmission is designed such that the at least one cooling channel runs in the electric machine shaft of the electric machine rotor. For example, the electric machine shaft can be designed as a blind hole with a lance-shaped element integrated therein. According to this solution, oil flows through the lance from the transmission side to the other end of the electric machine shaft. The lance-shaped element is designed so that it is shorter than the blind hole. This ensures that oil flows back in the gap between the lance-shaped element and the blind hole and thereby absorbs the heat loss of the electric machine rotor. The oil enters the transmission space and flows back into the oil sump through a number of correspondingly radially running bores in the e-machine shaft at the interface between the e-machine shaft and the transmission input shaft. The e-machine shaft and the transmission input shaft can be designed as one and the same shaft in a way that is particularly favorable in terms of production technology.

Following the solution proposed according to the invention, the common housing for an electric machine and a transmission has meandering channel guides which are part of the water jacket cooling and are located within the common housing for the electric machine and the transmission at least below the oil sump of the transmission extend.

The joint housing proposed according to the invention also has an additional one in the area of the oil sump on an inner surface of the joint housing Cooling fins arrangement. By means of this additional cooling fin arrangement implemented on the inner surface of the common housing, the effective heat transfer of the inner surface of the common housing can be considerably increased.

The joint housing proposed according to the invention for accommodating an electric machine and a transmission is further characterized in that a transmission shaft (e.g. an idler gear shaft) including a gear wheel (e.g. idler gear) is arranged in the area of the additional cooling fin arrangement which increases the flow rate of a cooling medium, in particular of the lubricating oil, which further improves the heat transfer that can be achieved.

Furthermore, the common housing proposed according to the invention for accommodating an electric machine and a transmission is such that it has internal housing webs which conduct the heat generated in the interior of the common housing to the outside by heat conduction and apply this heat the environment can be released.

The joint housing proposed according to the invention is further provided, in order to further improve the heat dissipation to the surroundings, at least in the area of the gear cover, with an external ribbing which emits heat and enlarges the area.

Furthermore, the invention relates to the use of the common housing for receiving an e-machine and a housing in an e-axis module for an electric vehicle (EV = Electric Vehicle), a hybrid electric vehicle (HEV = Hybrid Electric Vehicle) or a plug -in hybrid electric vehicle (PHEV = Plug-In Hybrid Electric Vehicle).

Advantages of the invention

The solution proposed according to the invention permits an increased integration of subcomponents of E-axis modules by combining already existing cooling systems and, in particular, piping and additional components running in the outer region of a housing can be reduced.

The cooling of the e-machine in the form of the cooling of the e-machine shaft, which is proposed according to the invention, has the effect that the temperature difference at the bearings of the e-machine is reduced and thus the necessary bearing preload of the speeds of up to 16,000 revolutions / minute is made possible . Due to the liquid cooling, in particular in the form of a water jacket cooling, the temperature level of the bearing outer ring can be lower than that of the bearing inner ring. This effect is counteracted by cooling the electric machine shaft.

In the solution proposed according to the invention, the assembly of the lance-shaped element between the transmission input shaft and the electric machine shaft is possible such that the lance-shaped element executes the same speed as the shafts and can therefore be supported within the shafts, so that bending is counteracted. This in turn offers the possibility of designing the rotating union as a very short component. If the liquid cooling in the form of the water jacket cooling is extended to the gear oil sump, for example, the oil in the oil sump will cool effectively, which in turn has advantageous effects on the electric machine shaft cooling. On the other hand, the flow length of the cooling medium, for example cooling water, is considerably reduced in the form of a downstream independent cooling duct piping in or on the oil sump. This reduces the pressure loss in the water cooling system, which in turn has a positive impact on the efficiency and range of the vehicle. By using fewer components, a not inconsiderable cost reduction can be achieved. If the cooling channel deflections can be extended into the area of the oil sump, support for the transmission oil cooling can advantageously be achieved.

Figure list

• 1 einen Längsschnitt durch das erfindungsgemäß vorgeschlagene gemeinsame Gehäuse, wobei die Schnittebene im Bereich der E-Maschinenwelle liegt,
• 2 einen Längsschnitt durch das Gehäuse gemäß 1 mit den Schnittverläufen III - III, IV - IV und V - V,
• 3 einen Querschnitt durch das Gehäuse gemäß den 1 und 2 gemäß dem Schnittverlauf III - III,
• 4 einen Querschnitt durch das gemeinsame Gehäuse gemäß den Darstellungen in 1 und 2 gemäß dem Schnittverlauf IV - IV in 2,
• 5 einen Querschnitt durch das gemeinsame Gehäuse gemäß den 1 und 2 gemäß dem Schnittverlauf V - V.
• 6 eine perspektivische Ansicht einer Unterseite des gemeinsamen Gehäuses,
• 7 eine Draufsicht auf die Unterseite des gemeinsamen Gehäuses mit seitlich angeflanschtem A-Lagerschild,
• 8.1 eine perspektivische Ansicht des erweiterten Kanals,
• 8.2 einen Schnitt durch einen den erweiterten Kühlkanal abdeckenden Deckel,
• 8.3 eine perspektivische Ansicht eines beispielsweise aus Kunststoffmaterial gefertigten Deckels in Wannenform,
• 9 eine Draufsicht auf eine Umlenkungsstruktur für das Kühlmedium im erweiterten Kühlkanal und
• 9.1 eine Darstellung eines gleichmäßigen Temperaturverlaufes und einer gleichmäßigen Wärmeverteilung des Kühlmediums bei Passage des erweiterten Kühlkanals.

It shows:

• 1 2 shows a longitudinal section through the common housing proposed according to the invention, the sectional plane being in the region of the electric machine shaft,
• 2nd a longitudinal section through the housing 1 with the cuts III - III , IV - IV and V - V ,
• 3rd a cross section through the housing according to the 1 and 2nd according to the course of the cut III - III ,
• 4th a cross section through the common housing as shown in 1 and 2nd according to the course of the cut IV - IV in 2nd ,
• 5 a cross section through the common housing according to the 1 and 2nd according to the course of the cut V - V .
• 6 a perspective view of an underside of the common housing,
• 7 a plan view of the underside of the common housing with the flanged A-bearing plate,
• 8th .1 is a perspective view of the enlarged channel,
• 8th .2 a section through a cover covering the expanded cooling duct,
• 8th 3 is a perspective view of a cover in the form of a tub, for example made of plastic material,
• 9 a plan view of a deflection structure for the cooling medium in the expanded cooling channel and
• 9 .1 a representation of a uniform temperature profile and a uniform heat distribution of the cooling medium when passing through the extended cooling channel.

Variants

1 shows a longitudinal section through the common housing proposed according to the invention for receiving an electric machine and a transmission, the longitudinal section running in the area of an electric machine shaft.

How 1 can be seen, includes a common housing 14 a gearbox with an integrated end shield 10th and a gear cover 12 . In the common housing 14 are both the at least one electric machine 20th as well as at least one gear 26 housed. At the top of the common housing 14 there is a power electronics 16 that have a connector 18th disposes. The at least one electric machine 20th that in the common housing 14 according to 1 has an electric machine shaft 22 . The e-machine shaft 22 is from a cooling duct 68 penetrated, which is connected to an oil cooling. From the representation according to 1 shows that in the cooling channel 68 a lance-shaped element 67 is housed. This is via one of the gear cover 12 provided rotary union 8th with a cooling medium, for example oil from the oil sump of the transmission 26 , provided. According to the flow path 69 the oil through the cooling channel 68 the e-machine shaft 22 takes, this flows in the direction of the B-end shield 13 , and from there over the cooling channel 68 , whose diameter is larger than the diameter of the lance-shaped element 67 , for the rotating union 8th back. Via, for example, opposite radial bores 25th in a transmission input shaft 27th of the transmission 26 the gears and the bearing positions can be supplied with the lubricant. The oil pump itself is not shown, only its position 9 in the area of the oil sump in the common housing 14 .

1 shows that in the common housing 14 next to the at least one electric machine 20th a gearbox 26 is housed. The gear 26 includes in the variant according to 1 an output gear with an integrated differential gear 32 , which with a circumferential helical toothing 34 is provided, also a first idler gear 56 , which on an idler gear shaft, not shown 58 is recorded as well as at least one further second idler gear 62 which in the 1 is only partially shown.

How 1 also shows the common housing 14 over a number of cooling channels 24th who are part of Water jacket cooling 30th are. In the common housing 14 is the e-machine shaft 22 through a first camp 36 as well as a second warehouse 38 in the area of the transmission 26 supported, also by a third camp 40 as well as a fourth camp 42 in the area of the e-machine rotor 28 .

In the lower area of the common housing 14 is on the side of the gearbox 26 an oil sump 44 . With reference numbers 46 is called a cooling channel deflection. Like the longitudinal section through the common housing 14 in the representation according to 2nd are the individual cooling channels 24th the water jacket cooling 30th , especially in the lower area of the common housing 14 towards the oil sump 44 extended. How 2nd shows, the deepest of the cooling channels 24th a cooling channel extension 48 on which is under the oil sump 44 below the gearbox 26 in the common housing 14 extends. As a result, the transmission is cooled 26 inside the common housing 14 not just over the entire surface of the gearbox 10th with integrated A-end shield, to which the cooling medium gear oil gives off its heat, but also through the water jacket cooling 30th in the form of the cooling duct extension 48 below the oil sump 44 , where the transmission oil can also dissipate heat to the cooling medium, for example cooling water. This cooling channel extension 48 can also be used on other cooling channels 24th be extended so that the effective cooling surface in the common housing 14 can be increased significantly.

Through the cooling channel extension 48 of the cooling channel 24th the water jacket cooling 34 the cooling media are water of the water jacket cooling 30th as well as the cooling medium oil within the gearbox 26 coupled with each other; both cooling media ensure heat dissipation from the common housing 14 , especially below the oil sump 44 of the common housing 14 .

According to the presentation 2nd are also the cutting planes III - III such as IV - IV such as V - V see the following 3rd , 4th and 5 .

2nd shows that in the cooling channel 68 the e-machine shaft 22 a lance-shaped element 67 is included. The lance-shaped element 67 , whose length is shorter than the length of the cooling channel 68 , is formed with a smaller diameter than the diameter of the cooling channel 68 . This results in that of the rotating union 8th outgoing flow path 69 of the oil through the lance-shaped element 67 towards the B-end shield 13 and back from it according to the flow path 69 for the rotating union 8th . In a modification of the 2nd The embodiment shown could be the cooling channel 68 through a through hole and another rotating union on the B-end shield 13 with a return line to the oil sump 44 of the transmission 26 get connected. 2nd also shows that in the transmission input shaft 27th of the transmission 26 several radial bores extending in the radial direction 25th are provided, via which the oil, the bearings or the gear teeth 26 supplied with lubricant. Furthermore, the rotating union 8th who have favourited Oil from the Oil Sump 44 of the transmission 26 sucked in over a 2nd Oil pump, not shown, powered mechanically or electrically. A position of the oil pump in the area of the oil sump 44 of the transmission 26 is in 2nd by reference numerals 9 indicated.

Analogous to the representation according to 1 is 2nd that the at least one cooling channel 68 E-machine shaft 22 in the common housing 14 through the first camp 36 , the second camp 38 in the area of the transmission 26 as well as through the third camp 40 as well as the fourth camp 42 in the area of the e-machine rotor 28 is stored.

3rd represents the course of the cut III - III as he is in 2nd is drawn.

Out 3rd shows that the cooling channel deflection 46 or the cooling channel extension 48 down under the oil sump 44 in the common housing 14 of the transmission 26 extends. The cooling duct redirection 46 or the cooling channel extension 48 the water jacket cooling 30th extends in the common housing 14 , preferably in the bottom area of the same. Above the common housing 14 is the power electronics shown cut open 16 as well as the connector plug integrated into it 18th . According to the sectional view 3rd can also be seen that inside the common housing 14 for the at least one electric machine 20th and the gear 26 Housing bars 52 are located. The housing bars 52 are arranged in a star shape and run in a radial direction from the inside to the outside. The housing bars 52 can also take any other form with which the strength requirements for heat conduction can be ensured. The housing bars 52 contribute in an advantageous manner to heat conduction, so that inside the common housing 14 heat generated via the housing webs 52 to the outer boundary surfaces of the common housing 14 can be directed. From the representation according to 3rd also shows that the deflections in the gearbox 10th with an integrated A-end shield are attached so that one of the cooling channels 24th towards the redirection and the closest of the cooling channels 24th leads away from this again. The course of the cooling channels 24th run according to the presentation 3rd perpendicular to the plane of the drawing 3rd . There can be one or more deflections of the cooling channels 24th in the gearbox 10th be provided with an integrated A-end shield. Depending on the geometry of corresponding designs, several deflections of the cooling channels can also be used 24th under the oil sump 44 be expanded and thus further improve the cooling effect.

4th represents the course of the cut IV - IV according to 2nd . Here, too, is the one above the common housing 14 arranged power electronics 16 partially cut open, as well as the connector 18th . In the in 4th shown sectional view IV - IV is the e-machine shaft 22 not shown. According to the drawing level 4th runs the at least one cooling channel 68 that with the lubricant circuit of the transmission 26 connected is.

One on the electric machine shaft 22 arranged drive wheel 64 (compare illustration according to 5 ) is in the sectional view according to 4th not shown. Furthermore shows 4th that a first idler 56 of the transmission 26 on an idler gear shaft 58 is included. This meshes with the driven gear 32 with integrated differential gear of the gear 26 , the output gear 32 the helical gearing with integrated differential gear 34 having.

At the bottom of the common housing 14 in the area of the inner surface 50 of the common housing 14 is an additional cooling fin arrangement 54 shown. This increases the effective heat transfer area, especially in the area of the inner surface 50 of the common housing 14 , so that a better cooling surface enlargement is given. Also in 4th are the housing webs that extend in the radial direction 52 shown, via which a heat transport by heat conduction within the common housing 14 heat generated towards the outside of the common housing 14 to the environment. The additional cooling fin arrangement 54 is in the representation according 4th only indicated schematically and could also have a different configuration. Below the additional cooling fin arrangement 54 runs the cooling channel extension 48 the Cooling channels 24th the water jacket cooling 30th of the at least one electric machine 20th .

5 shows the course of the cut V - V as shown in 2nd .

According to the representation 5 is the power electronics 16 shown uncut, as well as the connector plug integrated into it 18th . 5 shows that on the e-machine shaft 22 recorded drive wheel 64 the electric machine 20th with a second idler gear 62 combs which rotates 60 rotates. The second idler 62 is recorded on a shaft, not shown. The gear cover 12 of the common housing 14 points as shown in 5 on the outside of the gearbox cover 12 an external ribbing 66 on. This also represents an increase in the effective heat transfer area of the common housing 14 to the environment. Due to the rotation of the second idler gear 62 in in 5 shown sense of rotation 60 , is inside the gearbox 26 in the common housing 14 an acceleration of the flow rate of the cooling medium oil is achieved. This in turn improves heat dissipation. For completeness, please refer to 5 still mentioned that the illustrated second camp 38 is located in a bearing shell, through the housing webs 52 is formed. These extend analogously to the external ribbing 66 on the outside of the gearbox cover 12 also essentially in the radial direction, so that an improved heat transfer due to heat conduction from the interior of the common housing 14 can be displayed on its outer surfaces and from there to the environment.

6 shows a perspective bottom view of the common housing and gear cover.

According to the perspective view 6 shows that the gear cover 12 on the side of the common housing 14 is flanged. On the outside of the gear cover 12 there is an outer rib that optimizes heat dissipation 66 ; a cooling channel that runs through the electric machine shaft 22 the electric machine 20th extends is by reference numerals 68 indicated. On a bottom 70 of the common housing 14 there is an extended cooling duct 72 who in the manufacture of the common housing 14 molded as a cast component from the outside and can be manufactured, for example, via a separate core. The extended channel 72 is through a lid 74 covered. The lid 74 includes one of the extended cooling channel 72 facing inside 73 as well as an outside 75 , which can have an external ribbing. The lid 74 as shown in 6 is on a flat surface 76 on the extended cooling duct 72 applied covering this.

From the top view of the common housing 14 with flanged gear cover 12 according to 7 shows that in the outer wall of the common housing 14 recessed extended cooling duct 72 from the plane surface 76 is surrounded by a number of attachment points 78 is trained. For example, the in 6 illustrated lid 74 to the in 7 shown attachment points 78 for example by means of screws 84 (see. 8th .1) are attached. The extended cooling channel 72 is flowed through by the cooling medium, which at an inflow 80 in the extended cooling channel 72 occurs, there is a flow deflection 81 experiences and warms at a drain 82 again from the extended cooling channel 72 flows out. The cooling medium sweeps during the passage of the flow deflection 81 the whole in the extended cooling channel 72 available wall area of the common housing 14 , so that a relatively large area cooling can be achieved by the cooling medium.

8th .1 shows an expanded top view of the expanded cooling channel on the common housing 14 .

From the perspective view according to 8th .1 shows that the extended cooling duct 72 on the common housing 14 , which is preferably manufactured as a cast component, from a flat surface 76 is surrounded. On this flat surface 76 can, for example, according to the illustration 7 shown attachment points 78 be trained. These include threads for screws, for example 84 with which the lid 74 to the extended cooling channel 72 applied and sealed there.

From the sectional view according to 8th .2 shows that the extended cooling duct 72 with the lid installed 74 through the jointed components common housing 14 and gear cover 12 is formed. The inside 73 of the lid 74 can - as in 8th .2 shown - be executed plan, but can also be a redirection structure 96 have, such as in 9 is shown. The sectional view according to 8th .2 also shows that on the outside 75 of the lid 74 a ribbing 86 who have favourited Bridges 88 has, can be formed. According to the representation 8th .2 is the lid 74 non-positive over screws 84 for example with the common housing 14 connected.

8th .3 shows a perspective view of the lid.

From the representation according to 8th .3 shows that the lid 74 also as a plastic part 90 in tub shape 92 can be manufactured. On the in 8th .3 lid shown in perspective view 74 there is a surrounding edge 94 , at the individual attachment points 78 are executed. The lid 74 can of course also be made from a metallic material or a metallic alloy. The materials can be selected in such a way that there is an optimization with regard to the weight, the security of the heat transfer and the noise-vibration-harshness ratio. The flow guidance within the extended cooling channel 72 influencing redirection structures 96 can - as in 9 shown - at the bottom of the expanded cooling channel 72 , ie on the common housing 14 be cast on or they can also be on the inside 73 that according to 8th .3 is flat, so that the flow within the expanded cooling channel 72 with the lid installed 74 can be optimized.

An optimized flow through the extended cooling channel 72 be based on the 9 and 9 .1 explained in more detail.

From the top view according to 9 shows that there is at the bottom of the expanded cooling channel 72 an arched diversion structure 96 located. This can, for example, when casting the common housing 14 in the area of the extended cooling channel 72 run away from the plane surface 76 is surrounded. By forming the diversion structure of the arc-shaped diversion structure 96 in the extended cooling channel 72 there is mixing 98 of the cooling medium with an even heat distribution 100 , as shown schematically in the illustration 9 .1 is indicated. A uniform mixing results 98 of the cooling medium and a homogeneous heat distribution 100 . It is irrelevant whether the arched diversion structure 96 - as in 9 shown - at the bottom of the expanded cooling channel 72 , ie on the common housing 14 is formed, or whether this is on the inside 73 of the extended cooling channel 72 covering lid 74 located.

The invention is not restricted to the exemplary embodiments described here and the aspects emphasized therein. Rather, a large number of modifications are possible within the scope specified by the claims, which lie within the framework of professional action.

Claims (15)

Common housing (14) for an electric machine (20) and a transmission (26), with a water jacket cooling (30) for the electric machine (20) and with cooling channels (24, 72) running in the common housing (14), characterized in that the water jacket cooling (30) in the common housing (14) extends below an oil sump (44) of the transmission (26) which is driven by the electric machine (20), the electric machine rotor (28) of which at least comprises a cooling channel (68). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 1 , characterized in that the at least one cooling channel (68) is connected to a liquid cooling via a rotary leadthrough (8) on the gear cover (12). Common housing (14) for an electric machine (20) and a transmission (26), characterized in that the at least one cooling channel (68) runs in the electric machine shaft (22) of the electric machine rotor (28). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 1 , characterized in that meandering cooling channels (24) of the water jacket cooling (30) in the common housing (14) extend at least below the oil sump (44) and loop around a stator of the electric machine (20). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 1 , characterized in that an additional cooling fin arrangement (54) is provided in the area of the oil sump (44) on an inner surface (50) of the common housing (14). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 5 , characterized in that the additional cooling fin arrangement (54) increases the effective heat-transferring inner surface (50) of the common housing (14). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 5 , characterized in that an intermediate wheel shaft (58) arranged in the region of the additional cooling fin arrangement (54) and a first intermediate wheel (56) increase the flow rate of a cooling medium and improve the heat transfer. Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 1 , characterized in that the common housing (14) has internal housing webs (52) which transfer the heat to the common housing (14) by heat conduction. Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 1 , characterized in that the common housing (14) is provided at least on the gear cover (12) with an external ribbing (66) which increases the heat-emitting surface. Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 1 , characterized in that it has an enlarged cooling channel (72) accessible from the outside from an underside (70). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 10 , characterized in that the expanded cooling duct (72) is closed by a cover (74). Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 10 , characterized in that the expanded cooling channel (72) comprises ribs (86) and / or webs (88) and / or deflection structures (96) for the cooling medium, which on an inside (73) of the cover (74) or on the bottom of the extended cooling channel (72) formed on the common housing (14). Common housing (14) for an electric machine (20) and a gearbox (26), characterized in that the cover (74) is attached from a flat surface (76) of the expanded cooling duct (72) in a material or non-positive manner. Common housing (14) for an electric machine (20) and a transmission (26) according to Claim 11 , characterized in that the cover (74) is designed as a plastic part (90) having a trough shape (92), the inside (73) of which covers the expanded cooling duct (72) on the common housing (14) from the outside. Use of the common housing (14) according to one of the Claims 1 to 14 for accommodating an electric machine (20) and a transmission (26) in an electric axle module for an electric vehicle (EV = Electric Vehicle), a hybrid electric vehicle (HEV = Hybrid Electric Vehicle) or a plug-in hybrid electric vehicle (PHEV = Plug-in Hybrid Electric Vehicle).

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