Electric drive system for motor vehicle and motor vehicle

Abstract

The invention relates to an electric drive system (10) for a motor vehicle, comprising an electric machine (16) having a stator (18) and a rotor (20), and having a planetary gearbox (28) having a first planetary gear set (30) comprising a first sun gear (34), a first planet carrier (36) and a first ring gear (38). A second planetary gear set (32) having a second sun gear (40), a second planet carrier (42) and a second ring gear (44) is provided, and the second planetary gear set is arranged radially outside with respect to the axis of rotation (45) of the planetary gearbox (28) and axially overlaps (30) with the first planetary gear set. A differential gear (46) is provided having a first crown gear (48), a second crown gear (50), and comprising a compensation gear (56) arranged axially between and meshing with the crown gears (48, 50).

Description

Technical Field

[0001] The invention relates to an electric drive system for a motor vehicle and also to a motor vehicle having at least one such electric drive system. Background Art

[0002] DE 10 2018 008 939 B3 discloses an electric drive for a motor vehicle. In addition, DE 10 2014 000 499 A1 discloses a differential gear for a motor vehicle, wherein the driven gear can be configured as a crown gear, also called a crown wheel. DE 11 2004 002 526 B4 also uses a crown gear differential. DE 10 2017 006 266 A1 discloses an electric drive having two radially nested planetary gear sets. DE 10 2021 103 176 A1 discloses an electric drive having an electric motor, which is configured as an axial flux motor. Summary of the invention

[0003] The object of the present invention is to provide an electric drive system for a motor vehicle and a motor vehicle having such an electric drive system, such that a particularly compact design can be achieved.

[0004] This object is achieved by an electric drive system having the features of claim 1 and a motor vehicle having the features of claim 7. Advantageous embodiments with suitable developments of the invention are specified in the remaining claims.

[0005] A first aspect of the invention relates to an electric drive system for a motor vehicle, also referred to as an electric drive device or configured as an electric drive device. This means that the motor vehicle, also simply referred to as a vehicle, has an electric drive system in its fully manufactured state and can be driven, in particular purely electrically, by means of the electric drive system. For example, in the fully manufactured state of the motor vehicle, it has at least or exactly two axles, which are arranged one after the other in the longitudinal direction of the vehicle of the motor vehicle, and are therefore arranged one after the other, and the axles are also simply referred to as axles. The respective axles have, for example, at least or exactly two wheels, which are also simply referred to as wheels. The respective wheels of the respective axles are, for example, arranged on the sides opposite to each other in the transverse direction of the motor vehicle. The wheels are ground contact elements, by which the motor vehicle is supported downwards or can be supported on the ground in the vehicle height direction of the motor vehicle. For example, the motor vehicle is configured as a car, in particular a passenger car. If the motor vehicle is driven along the ground, while the motor vehicle is supported downwards on the ground in the vehicle height direction by the ground contact elements, the ground contact elements (wheels) roll directly on the ground in particular. For example, the wheels of at least one or exactly one axle or both axles can be driven by means of an electric drive system, in particular purely electrically. Wheels that can be driven by an electric drive system are also referred to as drive wheels. In the following, when a wheel is mentioned, this is understood to mean a drive wheel unless otherwise specified.

[0006] The electric drive system comprises an electric machine having a stator and a rotor. For example, the stator can be driven by the rotor and can therefore rotate relative to the rotor about a machine rotation axis. In particular, the electric machine can provide a drive torque via its rotor, by means of which the motor vehicle, in particular the wheels, can be driven electrically.

[0007] The electric drive system also includes a planetary gearbox. For example, the electric drive system includes a housing, wherein, for example, the planetary gearbox can be at least partially arranged in the housing. The planetary gearbox has a first planetary gear set, which is also referred to as a first planetary set. The first planetary gear set has a first sun gear, a first planetary gear carrier and a first ring gear. The first sun gear, the first planetary gear carrier and the first ring gear are the first gear elements of the planetary gear set. In particular, when the corresponding first gear element is not connected to the housing in a torsionally fixed manner, the corresponding first gear element can, for example, rotate relative to the housing around the first planetary gear set rotation axis.

[0008] The planetary gearbox also has a second planetary gear set, also referred to as a second planetary set. The second planetary gear set has a second sun gear, a second planetary gear carrier and a second ring gear. The second sun gear, the second planetary gear carrier and the second ring gear are second gear elements of the second planetary gear set. In particular, when the corresponding second gear element is not connected to the housing in a rotationally fixed manner, the corresponding second gear element can rotate relative to the housing around the second planetary gear set rotation axis. In particular, the planetary gear sets are arranged coaxially with each other, in particular relative to the planetary gear set rotation axis, so that the planetary gear set rotation axes coincide. Therefore, the planetary gear set rotation axes are along a common rotation axis or form a common rotation axis. In other words, the corresponding planetary gear set rotation axis is also referred to as the rotation axis.

[0009] The second planetary gear set is arranged radially outward with respect to the rotation axis of the planetary gear box, and overlaps with the first planetary gear set in the axial direction.

[0010] Unless otherwise stated, the terms "axial" and "radial" in the present disclosure refer to the axis of rotation of the planetary gearbox, relative to which the first gear element and, for example, the second gear element are arranged coaxially. "Radially inside" means in particular that an element, in particular a rotatably supported element, for example a first planetary gear set, is arranged radially inside another element, in particular a rotatably supported element, for example a first planetary gear set, when it is arranged in the region of a smaller radius, in particular in the radial direction of the planetary gearbox, and thus in particular in the radial direction of the electric drive system (the radial direction of the electric drive system extends perpendicularly to the axial direction of the planetary gearbox and, therefore, the axial direction of the electric drive system). The axial direction coincides with the axis of rotation. Therefore, the term "radially outside" is to be understood as an element, in particular a rotatably supported element, when it is arranged in the region of a larger radius, being arranged radially outside another element, in particular a rotatably supported element.

[0011] In particular, "axially overlapping" is to be understood as meaning that two elements, such as planetary gear sets, in particular viewed along the axis of rotation and therefore in the axial direction of the planetary gearbox and the drive system, overlap axially, in particular relative to one another, when they are at least partially arranged in the same axial region. In other words, the two elements are arranged to overlap axially, in particular relative to one another, if they have at least partially identical coordinates relative to a reference axis as the axis of rotation. The term "coaxial" is to be understood as meaning that two elements, in particular rotatably mounted elements, are arranged coaxially with one another when they are arranged to rotate about the same axis of rotation.

[0012] The electric drive system has a differential gear, in particular a differential gear which is arranged in addition to the planetary gearbox, which is also called a differential, axle differential or axle gear. For example, the wheels can be driven by the electric machine, in particular the rotor, via the differential gear. In particular, the differential gear can be driven by the rotor and thus by the electric machine via the planetary gearbox. Therefore, it is particularly provided that, with respect to the torque flow in which the corresponding drive torque provided or can be provided by the rotor can be transmitted from the rotor to the corresponding wheel, the planetary gearbox and the differential gear are arranged in the torque flow such that the planetary gearbox is arranged downstream of the rotor and upstream of the differential gear, and the differential gear is arranged downstream of the planetary gearbox and upstream of the corresponding wheel.

[0013] The differential gear is advantageously arranged coaxially with the planetary gearbox.The rotor, the differential gear and the planetary gearbox are advantageously arranged coaxially with respect to one another.

[0014] According to the invention, the differential gear has a first crown gear, in particular as a first driven gear, and a second crown gear, in particular as a second driven gear. A corresponding drive torque, also referred to as a drive moment, can be introduced into the planetary gearbox, for example, from the rotor. For example, the planetary gearbox can provide a corresponding drive torque generated by the corresponding drive torque introduced into the planetary gearbox, which drive torque can be introduced into the differential gear. The differential gear can, for example, distribute the corresponding input torque introduced into the differential gear to the wheels, in particular the crown gears, in particular in a 50-50 manner, so that, for example, the corresponding crown gear can provide a corresponding output torque generated by the corresponding input torque. In this case, the corresponding wheel can be driven by means of the provided corresponding output torque.

[0015] According to the invention, the differential gear has a compensating gear. The crown gear and the compensating gear are configured as gears. The compensating gear is arranged axially, i.e. in the axial direction of the electric drive system and thus between the crown gears when viewed along the axis of rotation, wherein the compensating gear meshes with the corresponding crown gear, in particular meshes simultaneously. For example, a first crown gear of the crown gears has a first toothing on its first axial end face, and for example, a second crown gear has a second toothing on its second axial end face. For example, the first axial end face faces the second axial end face in the axial direction of the electric drive system and vice versa, so that the axial end faces and therefore the teeth face each other in the axial direction of the drive system. In this case, the compensating gear engages the toothing of the crown gear so that the compensating gear meshes with the crown gear. In particular, the compensating gear is arranged between the axial end faces of the drive system.

[0016] The respective compensating gear is particularly rotatably arranged on the respective bearing bolt and, for example, the respective compensating gear is rotatably supported on the respective associated bearing bolt. The respective bearing bolt is particularly permanently and rotationally fixedly connected to the first planetary gear carrier and is rotationally fixedly connected to the second ring gear, so that, for example, the first planetary gear carrier and the second ring gear are particularly permanently and rotationally fixedly connected to each other. The respective bearing bolt of the respective compensating gear defines the respective compensating gear rotation axis, about which the respective compensating gear is rotatably supported on the respective bearing bolt of the compensating gear. The respective compensating gear rotation axis is arranged perpendicularly to the rotation axis of the planetary gearbox. The respective compensating gear rotation axis is also arranged perpendicularly to the planetary gear bolt (more precisely: perpendicularly to the rotation axis defined by the planetary gear bolt). The planetary gear bolt serves to support the planetary gears of the planetary gearbox. The planetary gear bolt, more precisely, the rotation axis defined by the planetary gear bolt is arranged parallel to the rotation axis of the planetary gearbox.

[0017] The housing wall is arranged axially adjacent to the planetary gearbox. For example, the housing wall is arranged between the electric motor and the planetary gearbox in the axial direction of the drive system, and it is conceivable, for example, that the differential gear and the planetary gearbox are arranged on a first wall side of the housing wall, wherein, for example, the electric motor is arranged on a second wall side of the housing wall. The first housing wall faces away from the second housing wall in the axial direction of the electric motor, and vice versa. In particular, the housing wall is a wall of the housing, also referred to as a switching wall.

[0018] The electric drive system further comprises a brake switching element, which is also referred to as a first switching element. The brake switching element is configured to connect the first toothed ring to the housing wall in a rotationally fixed manner and thereby to the housing in a rotationally fixed manner. In this case, the housing-side switching half of the brake switching element is arranged on the housing wall, in particular so that the housing-side switching half is in particular permanently and rotationally connected to the housing wall. In other words, the first toothed ring can be connected to the housing wall in a rotationally fixed manner by means of the brake switching element. For example, the brake switching element can be switched between a first coupling state and a first decoupling state (Endkoppelzustand). In the first coupling state, the first toothed ring is connected to the housing wall in a rotationally fixed manner by the brake switching element. In the first decoupling state, the brake switching element releases the first toothed ring to rotate about the axis of rotation and relative to the housing wall. For example, the brake switching element can be moved between at least one first coupling position for realizing the first coupling state and at least one first decoupling position for realizing the first decoupling state, in particular relative to the housing or the housing wall and / or translationally. This should be understood in particular that at least one switching part of the brake switching element can be moved between the first decoupling position and the first coupling position. The switching part is or includes, for example, a plurality of friction plates. In particular, it is conceivable that the brake shift element is a multi-disk clutch, also called a friction clutch or is designed as a friction clutch, whose disk carrier is arranged coaxially with the planetary gear set, for example.

[0019] Since the second planetary gear set is arranged radially outside the first planetary gear set and overlaps with the first planetary gear set in the axial direction, the planetary gear sets are at least partially, in particular at least mainly, and therefore more than half or even completely stacked relative to the rotation axis, in particular stacked on each other (aussteiner), whereby a particularly compact structure can be presented, in particular in the axial direction of the drive system. The first crown gear and the second crown gear are gears that are particularly configured as driven gears. Since the driven gear is a crown gear, the differential gear is configured as a crown gear differential, whereby a particularly compact structure can be presented. Since the housing-side switching half of the brake switching element is arranged on the housing wall, the housing-side switching half is connected to the housing wall, which is also called an intermediate wall or is configured as an intermediate wall. As a result, a particularly favorable noise behavior can be displayed, wherein the noise behavior is also called NVH behavior (NVH-noise, vibration and harshness). In addition, the brake switching element allows a particularly demanding and favorable switchability of the drive system.

[0020] In the scope of the present disclosure, ordinal numbers, also known as ordinal numbers, such as "first", "first", "second" and "second", etc. are not necessarily used to indicate or imply a number or quantity, but are used to clearly refer to the term to which the ordinal number is assigned or indicated.

[0021] In the context of the present disclosure, the feature that “two components are connected to each other in a rotationally fixed manner” is to be understood as meaning that the components connected to each other in a rotationally fixed manner are arranged coaxially relative to each other and, in particular when the components are driven, rotate together or simultaneously at the same angular speed, in particular relative to the housing, about a common component rotation axis of the components (e.g. the rotation axis). The feature that “two components are connected to each other in a torque-transmitting manner” is to be understood as meaning that the components are coupled to each other in such a way that torque can be transmitted between the components, whereby when the components are connected to each other in a rotationally fixed manner, the components are also connected to each other in a torque-transmitting manner.

[0022] The feature “two components are permanently connected to one another in a torque-transmitting manner” is to be understood as meaning, for example, that no switching element is provided which can be switched between a coupling state in which the components are connected to one another in a torque-transmitting manner and a decoupling state in which no torque can be transmitted between the components via the switching element, but that the components are always or always and therefore permanently coupled to one another in a torque-transmitting manner, i.e. coupled to one another in such a way that torque can be transmitted between the components. Thus, for example, one of the components can be driven by the other of the components and vice versa. In particular, the feature “two components are connected to one another in a rotationally fixed manner” is to be understood as meaning that no switching element is provided which can be switched between a coupling state in which the components are connected to one another in a torque-transmitting manner and a decoupling state in which the components are decoupled from one another and can rotate relative to one another, so that torque cannot be transmitted between the components via the switching element, but that the components are always or always and therefore permanently connected or coupled to one another in a rotationally fixed manner.

[0023] The feature “two components can be connected to one another in a rotationally fixed or torque-transmitting manner” is to be understood in particular as meaning that the components are assigned a switching element which can be switched between at least one coupled state and at least one decoupled state. In the coupled state, the components are connected to one another in a rotationally fixed or torque-transmitting manner via the switching element, for example via a brake switching element. In the decoupled state, the components are decoupled from one another, so that in the decoupled state the components can rotate relative to one another, in particular about a component axis of rotation, and in particular so that no torque can be transmitted between the components via the switching element.

[0024] The term "connected in a torsionally fixed manner" is therefore to be understood as meaning that two elements, at least one of which or both are rotatably supported, are connected in a torsionally fixed manner to one another when they are arranged coaxially relative to one another and rotate at the same angular velocity. The feature "the element is formed in one piece" is to be understood as meaning that the element is formed in an integral form. The element thus has no connection points, such as joints. In other words again, the one-piece element is produced, for example, by preliminary shaping and thereby, for example, by casting or forging, so that the one-piece element and thus the one-piece element are, for example, castings or forgings. In other words, the one-piece element does not, for example, consist of a plurality of bodies formed separately from one another and connected to one another, but the one-piece element is formed from one single piece, so that the one-piece element is formed from a single block (Monoblock) or is constructed as a monoblock.

[0025] In order to be able to keep the installation space requirement of the electric drive system, in particular in the axial direction of the electric drive system and therefore when viewed along the axis of rotation, to a particularly small extent, it is further provided according to the invention that the rotor, the housing wall, the planetary gearbox, the first crown gear and the second crown gear are arranged in the stated order, i.e. in the listed order, one after the other, i.e. in sequence, relative to the axis of rotation of the planetary gearbox, i.e. along the axis of rotation of the planetary gearbox. In other words, it is preferably provided that, viewed along the axis of rotation of the planetary gearbox and therefore in the axial direction of the drive system, the rotor, the housing wall, the planetary gearbox, the first crown gear and the second crown gear are arranged in sequence in the following order: rotor—housing wall—planetary gearbox—first crown gear—second crown gear. In other words, the housing wall adjoins the rotor in the axial direction of the drive system, the planetary gearbox adjoins the housing wall in the axial direction, the first crown gear adjoins the planetary gearbox in the axial direction, and the second crown gear adjoins the first crown gear in the axial direction. Furthermore, according to the invention, a one-piece, i.e. integral, support element is provided. The support element according to the invention has a plate part, a first cylindrical part and a second cylindrical part. The corresponding cylindrical body part is cylindrical, i.e. in the form of a straight cylinder, in particular a hollow cylinder, for example, on the inner circumferential side and / or the outer circumferential side. The plate part, the first cylindrical body part and the second cylindrical body part are arranged coaxially relative to each other. The planetary gear bolts for the first planetary gear of the planetary gearbox are arranged on the plate part. In particular, the corresponding planetary gear bolts are fixed to the plate part in a rotationally fixed manner. For example, a corresponding first planetary gear of the first planetary gear is particularly rotatably supported on the corresponding planetary gear bolt. The first planetary gear is, for example, part of a first planetary gear set, wherein, for example, the corresponding first planetary gear is particularly meshed with the first sun gear and the first ring gear at the same time. For example, the second ring gear is arranged on the radial inner side of the first cylindrical body part, i.e. facing inward in the radial direction of the drive system, in particular so that the second ring gear is particularly permanently and rotationally connected to the radial inner side of the first cylindrical body part. The radial inner side of the third cylindrical body part is also referred to as the first radial inner side. In addition, it is preferably provided that the compensation bolts for the compensation gear are arranged on the radial inner side of the second cylindrical body part, also referred to as the second radial inner side. In this case, for example, a respective one of the compensating gears is particularly rotatably held, in particular supported on a respective compensating bolt. For example, the respective compensating bolt is fixed in a rotationally fixed manner to the second radial inner side of the second cylindrical part. The one-piece support element is thus, for example, part of the first planetary gear carrier. By using a proportional support element, a particularly compact and weight-saving design can be achieved.

[0026] Another embodiment is unique in that another brake switching element, which is also referred to as a second switching element. It is conceivable that the first brake switching element is configured as a friction brake. For example, the other brake switching element is configured as a shape-fitting switching element, i.e., for example, a dog clutch. The other brake switching element is configured to connect the second planetary gear carrier to the housing in a rotationally fixed manner. In other words, the second planetary gear carrier can be connected to the housing in a rotationally fixed manner by means of another switching element. For example, the other brake switching element can be switched between a second coupling state and a second decoupling state. In the second coupling state, the second planetary gear carrier is connected to the housing in a rotationally fixed manner by means of a second switching element (another brake switching element). In the second decoupling state, the other brake switching element releases the second planetary gear carrier to rotate around the axis of rotation and relative to the housing. For example, the other brake switching element, i.e., at least one other switching part of the other brake switching element, can be moved, in particular relative to the housing and / or translationally, between at least one second coupling position for realizing the second coupling state and at least one second decoupling position for realizing the second decoupling state. Therefore, the favorable switchability of the drive system can be achieved in a space-saving manner.

[0027] Finally, in order to achieve a particularly weight- and space-efficient design of the drive system, it has proven to be particularly advantageous if the electric machine is designed as an axial flux machine.

[0028] For example, the one-piece support element is formed from light metal, in particular aluminum. The support element is preferably configured as an aluminum casting.

[0029] The respective planetary gear bolt is, for example, designed as one piece or in one piece. The respective planetary gear bolt can, for example, be formed from a metal material, in particular steel, so that, for example, the respective planetary gear bolt is designed as a steel bolt. Furthermore, it is conceivable that the respective compensation bolt is in one piece, i.e. in one piece. In particular, it is conceivable that the respective compensation bolt is formed from a metal material, in particular steel, so that the respective compensation bolt can be a steel bolt.

[0030] The second aspect of the present invention relates to a motor vehicle, which is preferably configured as an automobile, in particular a passenger car, which can also be referred to as a vehicle, which has an electric drive system according to the first aspect of the present invention and can be driven by means of the electric drive system, in particular purely electrically. The advantages and advantageous design solutions of the first aspect of the present invention should be regarded as the advantages and advantageous design solutions of the second aspect of the present invention, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. The above features and combinations of features mentioned in the description, as well as the features and combinations of features mentioned in the description of the drawings and / or shown alone in the drawings, may be used not only in the respective combination but also in other combinations or alone without departing from the scope of the invention.

[0032] In the attached picture:

[0033] Figure 1 a schematic diagram showing a first embodiment of an electric drive system for a motor vehicle; and

[0034] Figure 2 A schematic diagram of a second embodiment of an electric drive system is shown.

[0035] In the figures, identical elements or elements having the same function are provided with the same reference symbols. DETAILED DESCRIPTION

[0036] Figure 1 A first embodiment of an electric drive system 10 for a motor vehicle is shown in a schematic diagram. This means that the motor vehicle (also referred to as vehicle for short) has a drive system 10 in its fully manufactured state and can be driven electrically, in particular purely electrically, by means of the drive system 10. The motor vehicle has at least or exactly two axles, which are arranged one behind the other in the longitudinal direction of the motor vehicle and are therefore arranged one after the other. The respective axles have at least two or exactly two wheels, wherein the respective wheels of the respective axles are arranged on sides of the motor vehicle that are opposite to each other in the vehicle transverse direction. The wheels of at least one or exactly one axle can be driven electrically by means of the drive system 10. The wheels that can be driven by the drive system 10 are arranged in a Figure 1 It is particularly schematically shown in the figure and indicated by the reference numerals 12 and 14.

[0037] The electric drive system 10 has an electric machine 16 having a stator 18 and a rotor 20. The electric machine 16 can provide a corresponding drive torque for driving the wheels 12 and 14 via its rotor 20. The corresponding drive torque is Figure 1 This is indicated by arrow 22 . The rotor 20 can be driven by means of the stator 18 so as to rotate about a machine axis of rotation 24 relative to the stator 18 and relative to a housing 26 of the drive system 10 .

[0038] The drive system 10 has a planetary gearbox 28 having a first planetary gear set 30 and a second planetary gear set 32. The first planetary gear set 30 has a first sun gear 34, a first planetary gear carrier 36, and a first ring gear 38. The second planetary gear set 32 ​​has a second sun gear 40, a second planetary gear carrier 42, and a second ring gear 44. The first planetary gear set 30 has a first planetary gear, wherein the first planetary gear is Figure 1 denoted as P1 in the figure. As can be seen from the example of the planetary gear P1, the planetary gear P1 is rotatably held, in particular supported on the planetary gear carrier 36. The corresponding planetary gear P1 is in particular meshing with the sun gear 34 and the ring gear 38 simultaneously. The planetary gear set 32 ​​has a second planetary gear, wherein the second planetary gear is Figure 1 It is indicated as P2 in the figure. As can be seen from the example of the second planetary gear P2, the second planetary gear P2 is rotatably held, in particular supported on the planetary gear carrier 42. The corresponding planetary gear P2 meshes with the sun gear 40 and the ring gear 44 in particular at the same time.

[0039] The second planetary gear set 32 ​​is arranged radially outside with respect to the rotation axis 45 (also referred to as the planetary gear set rotation axis) of the planetary gearbox 28 and overlaps the first planetary gear set 30 in the axial direction, in particular stacked on top of each other, of the planetary gearbox 28 and the drive system 10 coinciding with the rotation axis 45. In the first embodiment, the planetary gear sets 30 and 32 are stacked on top of each other, in such a way that the planetary gear set 32 ​​is arranged on the planetary gear set 30 or stacked on the planetary gear set 30. In other words, the planetary gear set 30 is arranged at least partially, in particular at least predominantly, and therefore at least more than half or completely, in the second planetary gear set 32, viewed in the axial direction of the drive system 10 and therefore along the rotation axis 45. The sun gears 34 and 40, the planetary gear carriers 36 and 42, and the ring gears 38 and 44 are gear elements of the planetary gearbox 28. In particular, when the respective gear elements are not connected to the housing 26 in a rotationally fixed manner, the respective gear elements can rotate relative to the housing 26 about the rotation axis 45. It can be seen that the planetary gear sets 30 and 32 are arranged coaxially relative to each other, and the electric machine 16 is arranged coaxially relative to the planetary gear sets 30 and 32 , such that the machine axis of rotation 24 coincides with the axis of rotation 45 .

[0040] The drive system 10 further comprises a differential gear 46 which is configured as a crown gear differential. The differential gear 46 has a first crown gear 48 as a first driven gear and a second crown gear 50 as a second driven gear. The driven gears are gears. The crown gear 48 has a first axial end face 52 and the crown gear 50 has a second axial end face 54. The axial end faces 52 and 54 face each other in the axial direction of the drive system 10 and therefore when viewed along the axis of rotation 45. The crown gear 48 has a first toothing on the end face 52 and the crown gear 50 has a second toothing on the end face 54. Therefore, the toothing faces each other in the axial direction of the drive system 10.

[0041] The differential gear 46 also has a compensating gear, wherein Figure 1 , the compensating gear 56 can be seen. The respective compensating gear 56 is a further gear in the differential gear 46. The respective compensating gear 56 is arranged in the axial direction of the planetary gearbox 28 and thus in the axial direction of the drive system 10 between the crown gears 48 and 50, in particular between the end faces 52 and 54. In this case, the compensating gear 56 meshes in particular with the crown gears 48 and 50 simultaneously. The compensating gear 56 can rotate relative to the housing 26 about a differential rotation axis 58. Furthermore, the respective compensating gear 56 can rotate relative to the housing 26 about a respective compensating gear rotation axis 60 (also referred to as the compensating rotation axis), wherein the respective compensating gear rotation axis 60 extends perpendicularly to the differential rotation axis 58. It can be seen that the differential gear 46 is arranged coaxially with the planetary gear sets 30 and 32, and therefore with the planetary gearbox 28, and also with the electric machine 16, so that the differential rotation axis 58 coincides with the machine rotation axis 24 and the rotation axis 45.

[0042] The corresponding drive torque provided or available by arrow 22 can be introduced into the planetary gearbox 28. The planetary gearbox 28 can provide a corresponding input torque generated by the corresponding drive torque, in particular via the planetary gear carrier 36, which input torque can be introduced into the differential gear 46, in particular via the compensation gear 56. The differential gear 46 can distribute or transmit the corresponding drive torque, in particular half, to the wheels 12 and 14, in particular so that the corresponding crown gears 48, 50 can provide a corresponding output torque generated by the corresponding input torque. The output torque that can be provided by the crown gear 48 is Figure 16 and 64. As can be seen, wheel 12 can be driven by means of the output torque indicated by arrow 62 and thus by means of crown gear 48, and wheel 14 can be driven by means of the output torque indicated by arrow 64 and thus by means of crown gear 50. Crown gears 48 and 50 are arranged coaxially with respect to one another and can rotate relative to housing 26, in particular relative to one another, about differential axis of rotation 58. In particular, differential gear 46 has a function which is already sufficiently known from the general prior art, namely that differential gear 46 allows different speeds in wheels 12 and 14, in particular during cornering of the motor vehicle, in particular so that the wheel on the outside of the bend rotates or is capable of rotating at a higher speed than the wheel on the inside of the bend, in particular when wheels 12 and 14 are connected to rotor 20 for transmitting torque and are therefore drivable or driven by rotor 20.

[0043] The respective compensation gear 56 is particularly rotatably arranged on a respective bearing bolt 66. The respective bearing bolt 66 is particularly permanently and rotationally fixedly connected to the planetary gear carrier 36 and is particularly permanently and rotationally fixedly connected to the second ring gear 44. Therefore, it is particularly provided that the second ring gear 44 and the first planetary gear carrier 36 are particularly permanently and rotationally fixedly connected to each other. It can be seen that the ring gear 44 and the planetary gear carrier 36 form the output of the planetary gearbox 28, which can provide a corresponding input torque generated by the corresponding drive torque via its output.

[0044] exist Figure 1 In the first embodiment shown, a housing wall 68 as a wall of the housing 26 is arranged axially adjacent to the planetary gearbox 28. The housing wall 68 extends radially and therefore extends in the radial direction of the planetary gearbox 28 and the drive system 10 relative to the axis of rotation 45, the radial direction of the drive system being perpendicular to the axial direction of the planetary gearbox 28 and the drive system 10. In the first embodiment, the housing wall 68 is arranged on the axial side of the planetary gearbox facing away from the rotor 20. The first brake switching element SE1 and the second brake switching element SE2 each have a switching half directly connected to the housing wall 68 in a rotationally fixed manner, namely a first switching half 70 of the first brake switching element SE1 and a third switching half 71 of the second brake switching element SE2. The first brake switching element SE1 is configured to connect the second sun gear 40 and the first ring gear 38 to the housing 26 in a rotationally fixed manner. The second brake switching element is configured to connect the second planetary gear carrier 42 to the housing 26 in a rotationally fixed manner. The first brake switching element SE1 and the second brake switching element SE2 are advantageously arranged to overlap each other in the axial direction. The second brake shifting element SE2 is advantageously arranged axially outside the first brake shifting element SE1 .

[0045] exist Figure 1In the first exemplary embodiment shown, the electric machine 16 is designed as a radial flux machine.

[0046] Figure 2 A second embodiment of the drive system 10 is shown. Figure 2 It can be seen that in the second embodiment, the housing wall 68 as the wall of the housing 26 is also arranged axially adjacent to the planetary gearbox 28 .

[0047] In the second embodiment, the drive system 10 also has a first brake shifting element SE1, by means of which the first ring gear 38 can be connected in a rotationally fixed manner to the housing 26 and thus to the housing wall 68. In this case, a housing-side first shifting half 70 of the first brake shifting element SE1 is arranged on the housing wall 68, in particular so that the first shifting half 70 is in particular permanently and rotationally fixedly connected to the housing wall 68. For example, a wheel-side second shifting half 72 of the first brake shifting element SE1 is arranged on the first ring gear 38, in particular is permanently and rotationally fixedly connected to the first ring gear 38.

[0048] It can be seen that in the second embodiment, relative to the axial direction of the rotation axis 45 of the planetary gearbox 28 and therefore in the axial direction of the planetary gearbox 28 and the drive system 10, the rotor 20, the housing wall 68, the planetary gearbox 28, the first crown gear 48 and the second crown gear 50 are arranged in the following order: rotor 20—housing wall 68—planetary gearbox 28—first crown gear 48—second crown gear 50.

[0049] Furthermore, in the second exemplary embodiment, the drive system 10 further comprises a second brake shift element SE2 , by means of which the second planet carrier 42 can be connected to the housing 26 in a rotationally fixed manner.

[0050] In its second embodiment, the electric drive system 10 comprises an integral (i.e. one-piece) support element 74, which is, for example, part of the planetary gear carrier 36 or forms the planetary gear carrier 36. The support element 74 has a plate portion 76, a first cylindrical portion 78 and a second cylindrical portion 80. The respective compensating gear 56 is held, in particular, in a rotationally fixed manner, in particular supported on the respective bearing bolt 66 (also referred to as compensating bolt). The respective first planetary gear P1 is held, in particular, rotatably supported, in particular supported on the respective planetary gear bolt 84. Figure 2It can be seen that the planetary gear bolts 84 for the first planetary gear P1 are arranged in particular rotationally fixed, in particular fixed to the plate part 76. For example, the planetary gear bolts 84 are formed separately from the support element 74, and therefore separately from the plate part 76, and are held in particular rotationally fixed, in particular fixed to the plate part 76. The second ring gear 44 is arranged in particular rotationally fixed, in particular fixed to the first radial inner side S1 of the second cylindrical part 78. It is conceivable that the ring gear 44 is formed separately from the support element 74, and therefore separately from the first cylindrical part 78, and is arranged in particular rotationally fixed, in particular fixed to the first radial inner side S1 and thus the first cylindrical part 78. It is also conceivable that the ring gear 44 is formed integrally with the support element 74, so that the one-piece support element 74 forms the second ring gear 44. The compensating bolt (bearing bolt 66) is arranged in particular rotationally fixed, in particular held or fixed on the second radial inner side S2. For example, the corresponding compensating bolt is formed separately from the supporting element 74 , thus separately from the second cylindrical part 80 , and is held, in particular fixedly secured, to the first cylindrical part 78 and thus to the supporting element 74 in a rotationally fixed manner.

[0051] Figure 1 The first embodiment of the present invention further comprises a one-piece support element 74a having a plate portion 76a and a first cylindrical portion 78a. The planet gear bolts of the first planet gear carrier 36 are advantageously connected in one piece to the one-piece support element 74a of the first embodiment.

[0052] In addition, from Figure 1 and Figure 2 It can be seen that the ring gear 38 is connected in particular permanently and rotationally fixedly to the sun gear 40 .

[0053] In the second embodiment, the electric machine 16 is configured as an axial flux electric machine, the rotor 20 of which has two rotor elements 86 and 88, which are spaced apart from each other in the axial direction and are configured as rotor disks, for example. In this case, at least a partial area of ​​the stator 18 is arranged between the rotor elements 86 and 88 in the axial direction, so that the rotor element 88 overlaps with the partial area of ​​the stator 18 in a first overlapping direction extending parallel to the axial direction and pointing from the rotor element 88 to the rotor element 86. Therefore, the rotor element 86 overlaps with the partial area of ​​the stator 18 in a second overlapping direction, which extends parallel to the axial direction of the drive system 10, is opposite to the first overlapping direction, and points from the rotor element 86 to the rotor element 88.

[0054] Reference numerals list

[0055] 10 Electric drive system

[0056] 12 Wheels

[0057] 14 Wheels

[0058] 16 Motor

[0059] 18 Stator

[0060] 20 Rotor

[0061] 22 Arrow

[0062] 24 Machine rotation axis

[0063] 26 Housing

[0064] 28 Planetary gearbox

[0065] 30 First planetary gear set

[0066] 32 Second planetary gear set

[0067] 34 First sun gear

[0068] 36 First planetary gear carrier

[0069] 38 First gear ring

[0070] 40 Second sun gear

[0071] 42 Second planetary gear carrier

[0072] 44 Second gear ring

[0073] 45 Rotation axis

[0074] 46 Differential gear

[0075] 48 First Crown Gear

[0076] 50 Second crown gear

[0077] 52 First axial end face

[0078] 54 Second axial end face

[0079] 56 Compensation gear

[0080] 58 Differential rotation axis

[0081] 60 Compensation gear rotation axis

[0082] 62 Arrow

[0083] 64 Arrow

[0084] 66 Compensation bolt

[0085] 68 Shell wall

[0086] 70 First switching half

[0087] 71 Third switching half

[0088] 72 Second switching half

[0089] 74 Support elements

[0090] 76 Plate Section

[0091] 78 First cylindrical part

[0092] 80 Second cylindrical part

[0093] 84 Planetary gear bolt

[0094] 86 Rotor Components

[0095] 88 Rotor Components

[0096] S1 First radial inner side

[0097] S2 Second radial inner side

[0098] SE1 First brake shift element

[0099] SE2 Second brake shift element.

Claims

1. An electric drive system (10) for a motor vehicle, comprising: An electric motor (16) having a stator (18) and a rotor (20); - a planetary gearbox (28), said planetary gearbox comprising: o a first planetary gear set (30) having a first sun gear (34), a first planetary gear carrier (36) and a first ring gear (38); and a second planetary gear set (32), the second planetary gear set having a second sun gear (40), a second planetary gear carrier (42) and a second ring gear (44), and arranged radially outward relative to the rotation axis (45) of the planetary gearbox (28) and axially overlapping with the first planetary gear set (30); a first brake shifting element (SE1) which is designed to connect the first ring gear (38) to a housing wall (68) in a rotationally fixed manner, wherein a housing-side shifting half (70) of the first brake shifting element (SE1) is arranged on the housing wall (68); - a differential gear (46), It is characterized in that the differential gear having a first crown gear (48), a second crown gear (50) and a compensating gear (56), the compensating gear being arranged axially between the first crown gear (48) and the second crown gear (50) and meshing with the first crown gear and the second crown gear, each compensating gear being arranged on a respective bearing bolt (66), the bearing bolt (66) being connected in a rotationally fixed manner to the first planetary gear carrier (36) and in a rotationally fixed manner to the second ring gear (44), wherein a radially extending housing wall (68) is arranged axially adjacent to the planetary gear case (28); Wherein, relative to the rotation axis (45) of the planetary gearbox (28), the rotor (20), the housing wall (68), the planetary gearbox (28), the first crown gear (48) and the second crown gear (50) are arranged in the following order: the rotor (20)—the housing wall (68)—the planetary gearbox (28)—the first crown gear (48)—the second crown gear (50), A one-piece support element (74) is provided, which includes a plate portion (76), a first cylindrical portion (78) and a second cylindrical portion (80), wherein a planetary gear bolt (84) for a first planetary gear (P1) of the planetary gearbox (28) is arranged on the plate portion (76), wherein the second ring gear (44) is arranged on the radial inner side (S1) of the first cylindrical portion (78), and wherein the bearing bolt (66) is arranged as a compensation bolt for the compensation gear (56) on the radial inner side (S2) of the second cylindrical portion (80).

2. The electric drive system (10) according to claim 1, It is characterized in that A second brake shift element (SE2) is designed to connect the second planetary carrier (42) to a housing (26) of the electric drive system (10) in a rotationally fixed manner.

3. The electric drive system (10) according to claim 1 or 2, It is characterized in that The first ring gear (38) is permanently and rotationally fixedly connected to the second sun gear (40).

4. The electric drive system (10) according to any one of the preceding claims, It is characterized in that The electric machine (16) is designed as an axial flux machine.

5. A motor vehicle having an electric drive system (10) according to any one of the preceding claims.

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