DE102021213004A1 - Drive train for a motor vehicle - Google Patents

Abstract

The invention relates to a drive train (1) for a motor vehicle with at least one electric machine (2), with at least one transmission (3), with at least one power module (4), in particular a pulse-controlled inverter module (PWR), and with at least one housing (5) , wherein electrical energy provided, in particular by means of an accumulator, can be transmitted by means of the power module (4) to the electric machine (2) for driving the electric machine (2) or wherein electrical energy generated by means of the electric machine (2) can be transmitted by means of the power module (4) , in particular to an accumulator, can be transmitted, with a torque provided by the electric machine (2) being able to be transmitted from the electric machine (2) to the transmission (3) or with a torque being able to be transmitted from the transmission (3) to the electric machine (2). is, wherein the electric machine (2), the transmission (3) and the power module (4) are arranged essentially within the housing (5), wherein the transmission (3) is spatially between the electric machine (2) and the power module (4) is arranged, and wherein the power module (4) can be cooled by means of a cooling fluid (6).The drive train (1) is improved in that the housing (5) has a main space (5.1) and a power module space (5.2), the electric machine ( 2) and/or the transmission (3) are arranged and/or formed within the main space (5.1), the power module (4) being arranged and/or formed within the power module space (5.2), and a heat shield (7) for Cooling of the power module (4) and for cooling the transmission (3) functionally effective between the main space (5.1) and the power module space (5.2) is formed.

Description

The invention relates to a drive train for a motor vehicle having the features of the preamble of patent claim 1.

The CN 113212134A shows a drive train known in the prior art with an electric machine, a transmission, a power module and a single cooling circuit. The electric machine, the transmission and the power module each have a housing, namely an electric machine housing, a transmission housing and a power module housing. The electric machine is arranged within the electric machine housing, the transmission within the transmission housing and the power module within the power module housing. The transmission is arranged spatially between the electric machine and the power module, with the power module housing being screwed to the transmission housing from the outside. Electrical energy provided by means of an accumulator can be transmitted to the electric machine by means of the power module in order to drive the electric machine. A torque provided by the electric machine can be transmitted from the electric machine to the transmission. The power module can be cooled by means of a cooling fluid. The cooling fluid is then supplied to the electric machine to cool it.

In the US 10,644,571 B2 discloses a powertrain having an electric machine, a transmission, and a power module. The electric machine and the transmission are arranged in a common housing. The power module is arranged on the side next to the transmission and the electric motor. The power module can be cooled with a cooling fluid. A (transmission) oil for cooling and lubricating the components of the transmission can be cooled by means of a heat exchanger.

In the already known prior art, it is problematic that the drive trains require a relatively large amount of space, in particular because there is a relatively large distance between the transmission, in particular the transmission housing, and the power module, in particular the power module housing. Furthermore, a cooling of the transmission is insufficient or only with further, high equipment costs, such as with the example in the US 10,644,571 B2 described correspondingly large to be interpreted heat exchanger possible. The associated costs and the large amount of space required is therefore not optimal.

The invention is therefore based on the object of designing and/or developing the drive train in such a way that, in particular, the space required for the drive train is reduced and/or the cooling of the transmission is improved.

This object on which the invention is based is now initially achieved by a drive train for a motor vehicle having the features of patent claim 1 .

One aspect of the invention is essentially that the housing has a main space and a power module space. The electric machine and/or the transmission are arranged and/or configured within the main space. The power module is arranged and/or formed within the power module space. A further aspect of the invention is that a heat shield for cooling the power module and for cooling the transmission is functionally effective between the main space and the power module space.

Both the transmission and the power module can be cooled by means of the heat shield designed in this way. Furthermore, a particularly compact arrangement of the drive train is made possible. The transmission and the power module can be arranged and/or formed close to one another in an overall small installation space, with an undesirably high thermal influence of the transmission from the power module or the power module from the transmission being successfully avoided due to the heat shield.

Cooling channels are preferably arranged and/or formed in the heat shield. The heat shield has an inlet and an outlet. The cooling fluid can flow through the cooling channels. The cooling fluid can be fed to the heat shield via the inlet and, after flowing through the cooling channels, the cooling fluid can be discharged from the heat shield via the outlet.

The heat shield can be cooled in a simple and very effective manner by means of such a cooling fluid, or a corresponding heat shield can be implemented. Large amounts of heat can be dissipated by means of the cooling fluid. Alternatively, it would be conceivable, for example, to cool the heat shield with Peltier elements and thus with electrical energy.

In a further embodiment of the drive train, the heat shield has a base body and a cover. The base body and the cover can be and/or are connected to one another, in particular by means of a screw connection. Other connections such as welded connections and/or riveted connections are conceivable. The cooling channels are formed by means of the base body and the cover. The lid is off the main can be connected to the basic body. A first heat transfer surface is formed on the lid.

The cooling ducts can thus be produced simply and economically, since correspondingly simple manufacturing and assembly methods can be used to produce the cooling ducts.

In a further embodiment of the drive train, the heat shield protrudes at least partially into the main space.

In this way, the transmission can be cooled particularly effectively, since the heat shield can be arranged close to the components or the areas of the transmission on or in which heat is generated. The heat can then be dissipated by means of the heat shield before this heat can lead to an increase in temperature in adjacent components or areas. Furthermore, sealing surfaces of the base body formed on the base body and aligned towards the cover can be produced more easily if, in particular, the base body also protrudes at least partially into the main space. Such sealing surfaces have high surface qualities in order to be able to achieve a good sealing effect. Such sealing surfaces are e.g. produced and/or machined by means of chip-removing processes, with the sealing surfaces being easily accessible and thus easily machinable by means of an associated chip-removing tool due to the base body partially protruding into the main space.

The housing advantageously has an intermediate wall. The power module compartment and the main compartment are at least partially formed on opposite sides of the intermediate wall within the housing. In particular, the intermediate wall then at least partially forms the base body of the heat shield.

The compactness of the drive train can be further improved due to the fact that several functions can be fulfilled by means of the intermediate wall. On the one hand, the partition wall is used to form the two spaces and, on the other hand, to partially form the heat shield. Furthermore, a seal between the power module space and the main space can be improved due to the partial formation of the heat shield by means of the intermediate wall, since the number of surfaces to be sealed can be reduced in this way. If oil is present in the main space for additional cooling and/or for lubricating the transmission, the intermediate wall prevents this oil from flowing into the power module space.

In an advantageous embodiment of the drive train, the housing has a power module cover. The power module cover can be and/or is connected to the housing to form the power module space. A second heat transfer surface is formed on a side of the heat shield that faces the power module space. In particular, the second heat transfer surface is formed by means of a thermally conductive foil.

Because of this configuration of the power module space, simple assembly, in particular of the power module, is made possible. The power module can be pushed into the power module space from a side facing away from the main space. In particular, the power module can be connected to the housing in the area of the power module space from a side facing away from the main space. The power module cover can then be connected to the housing.

In a further embodiment of the drive train, the electric machine, the power module and the heat shield are each part of a cooling fluid circuit. The cooling fluid can first flow through areas of the power module to be cooled, then the heat shield and then areas of the electric machine to be cooled, in particular areas of a stator of the electric machine to be cooled.

In other words, the areas of the power module to be cooled, the heat shield and the areas of the electric machine to be cooled are connected in series in terms of flow. Such a circuit can be implemented in a structurally simple manner and also leads to good controllability and/or regulation of the cooling circuit.

In a further, alternative embodiment of the drive train, the power module, at least one distributor piece, the electric machine, and the heat shield are each part of a cooling fluid circuit. First, the cooling fluid can flow through areas of the power module that are to be cooled. The cooling fluid can then flow through the distributor piece. The cooling fluid can be fed from the distributor piece both to the areas of the electric machine to be cooled, in particular to the areas of a stator of the electric machine to be cooled, and to the heat shield. In particular, areas of the electric machine to be cooled, in particular areas of a stator of the electric machine to be cooled, and the heat shield—after the cooling fluid has flowed through the power module—can be flowed through in parallel by the cooling fluid in terms of flow. In other words, the heat shield and the areas of the electric machine to be cooled are then "connected in parallel" in terms of flow technology. By such a parallel connection is a flow resistance of the fluid circuit can be reduced. The cooling fluid circuit could also have a pump for conveying the cooling fluid through the cooling fluid circuit, in which case such a pump would then have to be designed to be smaller.

In an advantageous embodiment of the drive train, the electric machine has a drive shaft. The transmission has at least one transmission shaft and a differential. A drive pinion is arranged and/or formed on the drive shaft. A first transmission shaft gear wheel and a second transmission shaft gear wheel are each arranged and/or formed on the transmission shaft. A drive gear is arranged and/or formed on the differential. The drive pinion meshes with the first transmission shaft gear. The second transmission shaft gear meshes with the input gear. A torque provided by the electric machine can be transmitted from the electric machine via the transmission shaft to the differential, or a torque can be transmitted from the differential to the electric machine via the transmission shaft.

A drive train of this type can be implemented in a very compact manner, since only relatively few components are required for its implementation. Nevertheless, a large number of functions of the drive train are made possible, such as the conversion of the torque by means of the gear stages formed by means of the drive pinion, the first transmission shaft gear, the second transmission shaft gear and the drive gear. Usually, a right and a left wheel drive shaft are coupled and/or can be coupled to the differential, with one wheel of the motor vehicle being coupled and/or capable of being coupled by means of the right and the left wheel drive shaft.

In an advantageous embodiment of the drive train, the heat shield has a recess. The second transmission shaft gear wheel is at least partially arranged in the region of the recess, so that the second transmission shaft gear wheel is at least partially arranged in a plane running perpendicular to an axis of rotation of the transmission shaft and through the heat shield. In this way, the compactness of the drive train can be further increased. In particular, a distance between an end face of the electric machine facing the transmission and an end face of the power module facing the transmission and thus a width of the transmission developing in this distance direction can be made particularly short. Nevertheless, sufficient cooling of both the transmission and the line module is made possible by means of the heat shield.

• 1 in stark vereinfachter schematischer Darstellung ein erstes Ausführungsbeispiel eines Antriebsstranges für ein Kraftfahrzeug in einer Seitenansicht im Schnitt,
• 2 in stark vereinfachter schematischer Darstellung ein zweites Ausführungsbeispiel des Antriebsstranges für ein Kraftfahrzeug in einer Seitenansicht im Schnitt,
• 3 in stark vereinfachter schematischer Darstellung ein drittes Ausführungsbeispiel des Antriebsstranges für ein Kraftfahrzeug in einer Seitenansicht im Schnitt,
• 4 in schematischer Darstellung Teile des Antriebsstranges, insbesondere eines Grundkörpers eines Hitzeschildes, gemäß des ersten Ausführungsbeispiels des Antriebsstranges für ein Kraftfahrzeug in einer leicht dreidimensionalen Ansicht,
• 5 in schematischer Darstellung Teile des Antriebsstranges, insbesondere eines Deckels des Hitzeschildes, gemäß des ersten Ausführungsbeispiels des Antriebsstranges für ein Kraftfahrzeug in einer leicht dreidimensionalen Ansicht,
• 6 in schematischer Darstellung Teile des Antriebsstranges, insbesondere eines Leistungsmoduldeckels, gemäß des ersten Ausführungsbeispiels des Antriebsstranges für ein Kraftfahrzeug in einer leicht dreidimensionalen Ansicht,
• 7 in schematischer Darstellung Teile des Antriebsstranges, insbesondere eines Leistungsmodulraumes, gemäß des ersten Ausführungsbeispiels des Antriebsstranges für ein Kraftfahrzeug in einer leicht dreidimensionalen Ansicht, und
• 8 in schematischer Darstellung Teile des Antriebsstranges, insbesondere eines Getriebes, gemäß des ersten Ausführungsbeispiels des Antriebsstranges für ein Kraftfahrzeug in einer dreidimensionalen Ansicht.

There are now a large number of possibilities for designing and developing the drive train according to the invention for a motor vehicle in an advantageous manner. In this regard, reference may first be made to the patent claims subordinate to patent claim 1. A preferred embodiment of the drive train according to the invention for a motor vehicle will now be explained and described in more detail below with reference to the drawing and the associated description. In the drawing shows:

• 1 in a greatly simplified schematic representation of a first embodiment of a drive train for a motor vehicle in a side view in section,
• 2 in a greatly simplified schematic representation of a second embodiment of the drive train for a motor vehicle in a side view in section,
• 3 in a greatly simplified schematic representation of a third embodiment of the drive train for a motor vehicle in a side view in section,
• 4 in a schematic representation of parts of the drive train, in particular a base body of a heat shield, according to the first exemplary embodiment of the drive train for a motor vehicle in a slightly three-dimensional view,
• 5 in a schematic representation of parts of the drive train, in particular a cover of the heat shield, according to the first exemplary embodiment of the drive train for a motor vehicle in a slightly three-dimensional view,
• 6 in a schematic representation of parts of the drive train, in particular a power module cover, according to the first exemplary embodiment of the drive train for a motor vehicle in a slightly three-dimensional view,
• 7 a schematic representation of parts of the drive train, in particular a power module space, according to the first exemplary embodiment of the drive train for a motor vehicle in a slightly three-dimensional view, and
• 8th a schematic representation of parts of the drive train, in particular a transmission, according to the first exemplary embodiment of the drive train for a motor vehicle in a three-dimensional view.

In the 1 , 2 and 3 is a drive train 1 for a motor vehicle with at least one electric machine 2, with at least a transmission 3, with at least one power module 4, in particular a pulse-controlled inverter module PWR, and with at least one housing 5, shown.

In particular, electrical energy provided by means of an accumulator can be transmitted to the electric machine 2 by means of the power module 4 in order to drive the electric machine 2 . Alternatively, electrical energy generated by means of the electric machine 2 can be transmitted by means of the power module 4, in particular to an accumulator.

A torque provided by the electric machine 2 can be transmitted from the electric machine 2 to the transmission 3 or a torque can be transmitted from the transmission 3 to the electric machine 2 . A direct current or a direct voltage can be converted into an alternating current or an alternating voltage by means of a power module 4 designed as a pulse-controlled inverter module PWR. Such a pulse-controlled inverter module PWR is thus used in particular in combination with an accumulator providing a direct current or a direct voltage and an electric machine designed as an alternating current machine, in particular as an asynchronous machine.

The electric machine 2 , the transmission 3 and the power module 4 are essentially arranged inside the housing 5 . In this context, the term "essentially" means that certain parts of the electric machine 2, the transmission 3 and/or the power module 4, in particular parts that are not to be protected by the housing 5, are also located outside the housing 5 and/or within a housing wall of the Housing 5 arrange- and / or can be formed. This could be power connections of the power module 4 and/or the electric machine 2, for example. In particular, fixed components of the electric machine can be formed in such a housing wall.

The transmission 4 is spatially arranged between the electric machine 2 and the power module 4 . The power module 4 can be cooled using a cooling fluid 6 . Cooling of the power module 4 is necessary since the power module 4 in particular heats up considerably due to the large amounts of energy processed by means of the power module 4 during operation of the drive train 1 .

The housing 5 now has a main space 5.1 and a power module space 5.2. The electric machine 2 and/or the transmission 3 are arranged and/or constructed within the main space 5.1. It is conceivable, for example, that only the transmission 3 is arranged and/or formed within the main space 5.1 and the electric machine 2 is arranged and/or formed in a separate space. The power module 4 is arranged and/or formed within the power module space 5.2. A heat shield 7 for cooling the power module 4 and for cooling the transmission 3 is functionally effective between the main space 5.1 and the power module space 5.2.

In particular, good heat conduction is made possible both between the heat shield 7 and the main space 5.1 and between the heat shield 7 and the power module space 5.2. In particular, insulating air layers between the heat shield 7 and the main space 5.1 and between the heat shield 7 and the power module space 5.2 are avoided.

Cooling channels 7.1 are arranged and/or formed in the heat shield 7. The heat shield 7 has an inlet 7.2 and an outlet 7.3. The cooling fluid 6 can flow through the cooling channels 7.1. The cooling fluid 6 can be fed to the heat shield 7 via the inlet 7.2 and the cooling fluid 6 can be removed from the heat shield 7 via the outlet 7.3 after it has flowed through the cooling channels 7.1.

While the cooling fluid 6 flows through the cooling channels 7.1 when the drive train 1 is in operation, heat is transferred from the main chamber 5.1 and the power module chamber 5.2 to the cooling fluid 6. This heat is then dissipated from the heat shield 7 by means of the cooling fluid 6, the cooling fluid 6 having a higher temperature at the outlet 7.3 than at the inlet 7.2.

The heat shield 7 has a base body 7.4 and a cover 7.5. 4 shows a schematic representation of parts of the drive train 1, in particular the base body 7.4 of the heat shield 7, according to the first exemplary embodiment of the drive train 1 for a motor vehicle in a three-dimensional view. 5 shows a schematic representation of parts of the drive train 1, in particular the cover 7.5 of the heat shield 7, according to the first exemplary embodiment of the drive train 1 for a motor vehicle in a three-dimensional view. The base body 7.4 and the cover 7.5 can be and/or are connected to one another, in particular by means of a screw connection 7.6. The cooling channels 7.1 are formed by means of the base body 7.4 and the cover 7.5. The cover 7.5 can be connected to the base body 7.4 from the main space 5.1. A first heat transfer surface 7.7 is formed on the cover 7.5.

The base body 7.4 and/or the cover 7.5 have, in particular, grooves and webs formed between the grooves to form the cooling channels 7.1. This way are flow Paths of the cooling fluid 6 through the heat shield 7 can be positively influenced in terms of good heat transfer to the cooling fluid 6 . The cover 7.5 is in particular essentially plate-shaped. In this context, “substantially” means that a large part of the area of the cover 7.5 adjoining the main space 5.1 is arranged in one plane. The inlet 7.2 is arranged and/or formed on the base body 7.4, for example. The outlet 7.3 is arranged and/or formed on the cover 7.5, for example. However, a reverse arrangement and/or design would also be conceivable, ie an arrangement and/or design of the outlet on the base body and an arrangement and/or design of the inlet on the cover. Furthermore, both, namely the inlet and the outlet, can each be arranged and/or formed on the base body or the cover.

In the installed state, a seal, in particular a circumferential seal, is arranged between the base body 7.4 and the cover 7.5. The seal leads to a seal with sealing surfaces formed on the base body 7.4 and the cover 7.5, so that a flow of cooling fluid 6 from the heat shield 7 into the main space 5.1 is avoided.

The heat shield 7 protrudes at least partially into the main space 5.1. In particular, the base body has a surface adjoining the main space 5.1, which is essentially perpendicular, i.e. at an angle of 90° to 100° to the cover 7.5.

The housing 5 advantageously has an intermediate wall 5.3. The power module space 5.2 and the main space 5.2 are formed at least partially on opposite sides of the intermediate wall 5.3 within the housing 5. In the preferred embodiment, the intermediate wall 5.3 at least partially forms the base body 7.4 of the heat shield 7. The base body 7.4 borders on the cooling channels 7.1. The intermediate wall 5.3 also has other areas that are not directly adjacent to the cooling channels 7.1.

In the second embodiment of the drive train 1 from 2 the partition wall 5.3 and the base body 7.4 are designed as separate components, with the base body 7.4 being connectable and/or connected to the partition wall 5.3. In this case, the base body 7.4 is connected to the intermediate wall 5.3 during assembly from the main space 5.1.

In the third embodiment of the drive train 1 from 3 the power module 4 and the heat shield 7 are designed as a common structural unit. In this case, the structural unit consisting of the power module 4 and the heat shield 7 can be inserted into the housing 5 during assembly from the power module space 5.2, with the heat shield 7 being guided through an opening then formed in the intermediate wall 5.3. A suitable seal then takes place between the intermediate wall 5.3 and the structural unit made up of the power module 4 and the heat shield 7 .

The housing 5 has a power module cover 5.4. 6 shows a schematic representation of parts of the drive train 1, in particular the power module cover 5.4, according to the first exemplary embodiment of the drive train 1 for a motor vehicle in a three-dimensional view. In contrast to the 4 and 5 the case is 5 in 6 shown rotated by approx. 90°. The power module cover 5.4 can be and/or is connected to the housing 5 to form the power module space 5.2. A second heat transfer surface 7.8 is formed on a side of the heat shield 7 facing the power module space 5.3. In particular, the second heat transfer surface 7.8 is formed by means of a thermally conductive foil.

7 shows a schematic representation of parts of the drive train 1, in particular the power module space 5.2, according to the first embodiment of the drive train 1 for a motor vehicle in a three-dimensional view, wherein in contrast to 6 Neither the power module cover 5.4 nor the power module 4 itself is shown, so that the shape of the second heat transfer surface 7.8 can be seen particularly well.

Spaces between specific components of the power module 4 and the heat shield 7 can be filled and/or avoided by means of a thermally conductive film. A better heat transfer between the power module 4 and the heat shield 7 can thus be achieved. Unevenness of the power module 4 and/or the heat shield 7 can be compensated for by means of the thermally conductive foil.

The electric machine 2, the power module 4 and the heat shield 7 are each part of a cooling fluid circuit 8. First, areas of the power module 4 to be cooled, then the heat shield 7 and then areas of the electric machine 2 to be cooled, in particular areas of a stator 2.1 to be cooled Electrical machine 2, through which the cooling fluid 6 can flow sequentially one after the other.

Alternatively, the power module, at least one distributor piece, the electric machine, and the heat shield are each part of a cooling fluid circuit. First are areas of the lei to be cooled processing module can be flowed through by the cooling fluid. The cooling fluid can then flow through the distributor piece. The cooling fluid can be fed from the distributor piece both to the areas of the electric machine to be cooled, in particular to the areas of a stator of the electric machine to be cooled, and to the heat shield. In particular, areas of the electric machine to be cooled, in particular areas of a stator of the electric machine to be cooled, and the heat shield—after the cooling fluid has flowed through the power module—can be flowed through in parallel by the cooling fluid.

The cooling fluid circuit 8 may have other components such as a pump, a reservoir and/or a heat exchanger.

In 8th are shown in a schematic representation of parts of the drive train 1, in particular the transmission 3, according to the first embodiment of the drive train 1 for a motor vehicle in a three-dimensional view.

The electric machine 2 has a drive shaft 2.2. The transmission 3 has at least one transmission shaft 9 and a differential 10 . A drive pinion 2.3 is arranged and/or formed on the drive shaft 2.2. A first transmission shaft gear wheel 9.1 and a second transmission shaft gear wheel 9.2 are each arranged and/or formed on the transmission shaft 9. A drive gear 10.1 is arranged on the differential 10 and/or formed. The drive pinion 2.3 meshes with the first transmission shaft gear wheel 9.1. The second transmission shaft gear 9.2 meshes with the drive gear 10.1. A torque provided by the electric machine 2 can be transmitted from the electric machine 2 via the transmission shaft 9 to the differential 10 or a torque can be transmitted from the differential 10 to the electric machine 2 via the transmission shaft 9 .

Other embodiments of the transmission are conceivable, e.g. further transmission stages with corresponding components could be provided. Furthermore, the integration of at least one clutch into the drive train 1 is conceivable, such a clutch being able to be arranged and/or formed between the electric machine and the transmission, for example. The intermediate wall 5.3 has, in particular, a bearing mount for the gear shaft 9 and for the differential 10 in each case. The cover 7.5 is in particular arranged essentially perpendicularly to an axis of rotation of the transmission shaft 9.

The heat shield 7 has a recess 7.9. The second gear wheel 9.2 is at least partially arranged in the area of the recess 7.9, so that the second gear wheel 9.2 is at least partially arranged in a plane running perpendicular to the axis of rotation of the gear shaft 9 and through the heat shield 7. This results in an even more compact design.

A gap is formed between the heat shield 7 and the second transmission shaft gear wheel 9.2. The recess 7.9 is at least partially partially cylindrical, so that the gap essentially has a constant value, i.e. over a specific angular range of the second transmission shaft gear wheel 9.2, the value of the gap between the heat shield 7 and an addendum circle diameter of the second transmission shaft gear wheel 9.2 is measurable.

Reference List

1

powertrain

2

electric machine

2.1

stator

2.2

drive shaft

2.3

drive pinion

3

transmission

4

power module

5

Housing

5.1

main room

5.2

power module room

5.3

partition

5.4

power module cover

6

cooling fluid

7

heat shield

7.1

cooling channels

7.2

inlet

7.3

outlet

7.4

body

7.5

Lid

7.6

screw connection

7.7

first heat transfer surface

7.8

second heat transfer surface

7.9

recess

8th

cooling fluid circuit

9

gear shaft

9.1

first transmission shaft gear

9.2

second transmission shaft gear

10

differential

10.1

drive gear

PWR

PWM inverter module

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• CN 113212134A [0002]
• US 10644571 B2 [0003, 0004]

Claims (10)

Drive train (1) for a motor vehicle with at least one electric machine (2), with at least one transmission (3), with at least one power module (4), in particular a pulse-controlled inverter module (PWR), and with at least one housing (5), wherein, in particular electrical energy provided by means of an accumulator can be transmitted by means of the power module (4) to the electric machine (2) for driving the electric machine (2), or electrical energy generated by means of the electric machine (2) can be transmitted by means of the power module (4), in particular to a Accumulator, is transferable, wherein a torque provided by the electric machine (2) can be transferred from the electric machine (2) to the transmission (3) or wherein a torque can be transferred from the transmission (3) to the electric machine (2), wherein the The electric machine (2), the transmission (3) and the power module (4) are arranged essentially within the housing (5), the transmission (3) being arranged spatially between the electric machine (2) and the power module (4), and wherein the power module (4) can be cooled by means of a cooling fluid (6), characterized in that the housing (5) has a main space (5.1) and a power module space (5.2), the electric machine (2) and/or the transmission (3 ) are arranged and/or formed within the main space (5.1), the power module (4) being arranged and/or formed within the power module space (5.2), and a heat shield (7) for cooling the power module (4) and for cooling of the transmission (3) is functionally effective between the main space (5.1) and the power module space (5.2). Drive train (1) after claim 1 , characterized in that cooling channels (7.1) are arranged and/or formed in the heat shield (7), the heat shield (7) having an inlet (7.2) and an outlet (7.3), the cooling channels (7.1) being supplied by the cooling fluid (6) can be flown through, the cooling fluid (6) being able to be fed to the heat shield (7) via the inlet (7.2), and the cooling fluid (6) coming out of the heat shield after flowing through the cooling channels (7.1) via the outlet (7.3). (7) can be discharged. Drive train (1) after claim 2 , characterized in that the heat shield (7) has a base body (7.4) and a cover (7.5), the base body (7.4) and the cover (7.5) being connectable and/or connected to one another, in particular by means of a screw connection (7.6). are, wherein the cooling channels (7.1) are formed by means of the base body (7.4) and the cover (7.5), wherein the cover (7.5) can be connected to the base body (7.4) from the main chamber (5.1), in particular wherein a first heat transfer surface ( 7.7) is formed on the cover (7.5). Drive train (1) according to one of the preceding claims, characterized in that the heat shield (7) projects at least partially into the main space (5.1). Drive train (1) according to one of claims 3 or 4 , characterized in that the housing (5) has an intermediate wall (5.3), the power module space (5.2) and the main space (5.1) being formed at least partially on opposite sides of the intermediate wall (5.3) within the housing (5), and the intermediate wall (5.3) at least partially forming the base body (7.4) of the heat shield (7). Drive train (1) according to one of the preceding claims, characterized in that the housing (5) has a power module cover (5.4), the power module cover (5.4) being connectable and/or connected to the housing (5) to form the power module space (5.2). wherein a second heat transfer surface (7.8) is formed on a side of the heat shield (7) facing the power module space (5.2), in particular wherein the second heat transfer surface (7.8) is formed by means of a thermally conductive foil. Drive train (1) according to one of the preceding claims, characterized in that the electric machine (2), the power module (4) and the heat shield (7) are each part of a cooling fluid circuit (8), with areas of the power module ( 4), then the heat shield (7) and then areas of the electric machine (2) to be cooled, in particular areas of a stator (2.1) of the electric machine (2) to be cooled, through which the cooling fluid (6) can flow sequentially one after the other. Powertrain according to one of Claims 1 until 6 , characterized in that the power module, at least one distributor piece, the electric machine, and the heat shield are each part of a cooling fluid circuit, wherein areas of the power module that are to be cooled can initially be flowed through by the cooling fluid, with the cooling fluid then being able to flow through the distributor piece, wherein the cooling fluid can be fed from the distributor piece both to the areas of the electric machine to be cooled, in particular to the areas of a stator of the electric machine to be cooled, and to the heat shield, in particular so that areas of the electric machine to be cooled, in particular areas of a stator of the electric machine to be cooled, and the Heat shield - after the flow of the cooling fluid through the power module - can be flowed through in parallel by the cooling fluid. Drive train (1) according to one of the preceding claims, characterized in that the electric machine (2) has a drive shaft (2.2), the transmission (3) having at least one transmission shaft (9) and a differential (10), a drive pinion ( 2.3) is arranged and/or formed on the drive shaft (2.2), with a first gear shaft gear (9.1) and a second gear shaft gear (9.2) each being arranged and/or formed on the gear shaft (9), with a drive gear wheel (10.1) is arranged and/or formed on the differential (10), the drive pinion (2.3) meshing with the first transmission shaft gear wheel (9.1), the second transmission shaft gear wheel (9.2) being connected to the drive gear wheel (10.1) is engaged, with a torque provided by the electric machine (2) from the electric machine (2) via the gear shaft (9) to the differential (10) or with a torque from the differential (10) via the gear shaft (9) to the Electric machine (2) is transferrable. Drive train (1) after claim 9 , characterized in that the heat shield (7) has a recess (7.9), the second transmission shaft gear (9.2) being arranged at least partially in the region of the recess (7.9), so that the second transmission shaft gear (9.2) at least partially is arranged in a plane running perpendicular to an axis of rotation of the transmission shaft (9) and through the heat shield (7).

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