Electric drive device for a motor vehicle, in particular for an automobile

Abstract

An electric drive device has a planetary gear set, which includes has a first sun gear, a first planet carrier and a first ring gear. The drive device also includes a planetary gear set with a second sun gear that is or can be non-rotatably coupled to the first ring gear, a second planet carrier and a second ring gear that is or can be non-rotatably coupled to the first planet carrier. An electric motor has a rotor with an input shaft driveable by the rotor and permanently non-rotatably connected to the first sun gear. The drive device also includes an output shaft, a differential gear, a first switching element, and a second switching element. The planetary gear sets are arranged coaxially to the differential gear and the differential gear has a ball-shaped differential having a differential housing.

Claims

1. An electric drive device for a motor vehicle, the electric drive device comprising: a housing; a first planetary gear set arranged in the housing, wherein the first planetary gear set has, as first elements, a first sun gear, a first planet carrier, and a first ring gear; a second planetary gear set arranged in the housing, wherein the second planetary gear set has, as second elements, a second sun gear non-rotatably coupled or non-rotatably couplable to the first ring gear, a second planet carrier, and a second ring gear non-rotatably coupled or non-rotatably couplable to the first planet carrier; an electric motor having a stator and a rotor; an input shaft driveable by the rotor, wherein the input shaft is permanently non-rotatably connected to the first sun gear; an output shaft; a differential gear; a side shaft; a first switching element non-rotatably connecting the first ring gear to the housing; and a second switching element non-rotatably connecting one of the second elements to the housing or to one of the first elements, wherein the rotor, the first planetary gear set, the second planetary gear set, and the differential gear are arranged coaxially with respect to one another, wherein the side shaft is arranged between the differential gear and a wheel of the motor vehicle and passes through the rotor, wherein the differential gear has a ball-shaped differential housing and a receiving space, wherein the differential housing is permanently non-rotatably connected to the first planet carrier, wherein the ball-shaped differential housing is a bevel gear differential, wherein the receiving space is round, spherical, or spherical in segments, wherein the first sun gear is arranged adjacent to the differential housing as viewed in an axial direction, wherein a largest outer diameter of the differential housing is larger than an outer diameter of the first sun gear, wherein the second sun gear is arranged axially overlapping the differential housing, wherein an inner diameter of the second sun gear is larger than the largest outer diameter of the differential housing, and wherein the first switching element is arranged radially surrounding and at least partially axially overlapping the first planetary gear set.

2. The electric drive device of claim 1, wherein the second switching element is arranged axially substantially on a side of the first planetary gear set facing away from the electric motor.

3. The electric drive device of claim 1, further comprising: a first axial bearing axially supporting the first planet carrier relative to the second sun gear, wherein the first axial bearing is axially arranged between the first planetary gear set and the second planetary gear set.

4. The electric drive device of claim 1, further comprising: a second axial bearing axially supporting the second sun gear with respect to the second planet carrier, wherein the second axial bearing is arranged on a side of the second planetary gear set facing away from the electric motor, when view in the axial direction.

5. The electric drive device of claim 1, further comprising: a third axial bearing supporting the second planet carrier axially with respect to the second ring gear, wherein the third axial bearing is arranged on a side of the second planetary gear set facing away from the electric motor, when seen in the axial direction.

6. The electric drive device of claim 1, further comprising: a fourth axial bearing supporting the first planet carrier axially with respect to the housing, wherein the fourth axial bearing is arranged axially on a side of the first planetary gear set facing the electric motor.

7. The electric drive device of claim 1, further comprising: a fifth axial bearing supporting the second ring gear with respect to the housing, wherein the fifth axial bearing is arranged axially on a side of the second planetary gear set facing away from the electric motor and radially inside the largest outer diameter of the differential housing.

8. The electric drive device of claim 1, wherein the first switching element is a lamella switching element, and wherein the second switching element has at least one positive-locking element.

9. The electric drive device of claim 8, wherein an inner lamella carrier of the first switching element is formed integrally with the first ring gear and is non-rotatably connected via a plug-in or welded connection to a first connecting element, wherein the first connecting element is non-rotatably connected via a plug-in or welded connection to the second sun gear.

10. The electric drive device of claim 8, further comprising: a second connecting element which is formed integrally with an inner lamella carrier of the first switching element and is non-rotatably connected on a first side to the first ring gear by a first plug-in or welded connection and is non-rotatably connected on a second side to the second sun gear by a second plug-in or welded connection.

11. The electric drive device of claim 1, wherein the first ring gear is non-rotatably connected to the second sun gear, and wherein the second switching element non-rotatably connects the second planet carrier to the housing.

12. The electric drive device of claim 1, wherein the second ring gear is permanently non-rotatably connected to the first planet carrier.

13. The electric drive device of claim 12, further comprising: a hollow shaft arranged radially between the differential housing and the second sun gear, wherein the hollow shaft permanently non-rotatably connected to the first planet carrier and to the second ring gear.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

(1) The drawing shows in:

(2) FIG. 1 a schematic depiction of a first embodiment of an electric drive device for a motor vehicle according to the invention,

(3) FIG. 2a-d in each case in sections, a schematic depiction of a respective further embodiment of the electric drive device;

(4) FIG. 3 in sections, a schematic depiction of a further embodiment of the electric drive device;

(5) FIG. 4 in sections, a schematic depiction of a further embodiment of the electric drive device; and

(6) FIG. 5a, b in each case in sections, a schematic depiction of a further embodiment of the drive device.

(7) In the figures, identical or functionally identical elements are provided with the same reference numerals.

DETAILED DESCRIPTION

(8) FIG. 1 shows a schematic depiction of a first embodiment of an electric drive device 10 for a motor vehicle, in particular for an automobile such as, for example, a passenger car. The motor vehicle is designed, for example, as an electric vehicle, in particular as a battery electric vehicle, and can be driven, in particular exclusively, electrically. In this case, the motor vehicle can be driven electrically, in particular exclusively, by means of the drive device 10. The electric drive device 10 comprises a housing 12, depicted particularly schematically in FIG. 1, which delimits a receiving space 14, also referred to as a receiving area. The electric drive device 10 further comprises a planetary transmission 16, which is arranged or accommodated in the housing 12 and thus in the receiving space 14.

(9) The planetary transmission 16 and thus the drive device 10 comprises a first planetary gear set 18 and a second planetary gear set 20, which are arranged coaxially with respect to each other.

(10) The first planetary gear set 18 has a first sun gear 22, a first planet carrier 24, and a first ring gear 26. The sun gear 22, the planet carrier 24, and the ring gear 26 are first elements of the planetary gear set 18 or are also referred to as first elements. Furthermore, the first planetary gear set 18 comprises at least one first planetary gear 28, which is rotatably mounted on the planet carrier 24 and simultaneously meshes with the sun gear 22 and with the ring gear 26.

(11) The second planetary gear set 20 has a second sun gear 30, a second planet carrier 32, and a second ring gear 34. The sun gear 30, the planet carrier 32, and the ring gear 34 are second elements of the planetary gear set 20 or are also referred to as second elements. The sun gears 22 and 30, the planet carriers 24 and 32 and the ring gears 26 and 34 and the housing 12 are also referred to as structural elements of the drive device 10. The planetary gear sets 18 and 20 are thereby accommodated or arranged in the receiving space 14 and thus in the housing 12. The second planetary gear set 20 further comprises at least one second planetary gear 36, which is rotatably mounted on the planet carrier 32 and simultaneously meshes with the sun gear 30 and with the ring gear 34. The planet carriers 24 and 32 are also referred to as webs.

(12) In particular, when the respective element is non-rotatably connected to the housing 12, the respective element can rotate around an axis of rotation, also referred to as the main axis of rotation 38, relative to the housing 12, or the respective element can rotate around the main axis of rotation 38 relative to the housing 12, in particular, when the respective planetary gear set 18 or 20 is driven, that is, when a torque is introduced into the respective planetary gear set 18 or 20. Alternatively or additionally, the respective components can rotate around the main axis of rotation 38 relative to one another, in particular when the respective components are non-rotatably connected to one another. By way of example, if two of the structural elements are non-rotatably connected to each other or non-rotatably coupled to each other, the non-rotatably connected structural elements are secured against rotations occurring around the main axis of rotation 38 and relative to each other. By way of example, if two of the elements are non-rotatably connected or coupled to each other, and the planetary gear sets 18 and 20 are driven, the non-rotatably connected elements rotate together and thus as a block around the main axis of rotation 38, in particular relative to the housing 12. This means that the non-rotatably connected elements then revolve as a block. By way of example, if the respective element is non-rotatably connected or coupled to the housing 12, the respective element is secured against rotation relative to the housing 12 and around the main axis of rotation 38, such that the respective element non-rotatably connected to the housing 12 cannot rotate relative to the housing 12 around the main axis of rotation 38.

(13) It can be seen from FIG. 1 that the second sun gear 30 is or can be non-rotatably coupled to the first ring gear 36. In the first embodiment shown in FIG. 1, the sun gear 30 is non-rotatably coupled or connected, in particular permanently, to the ring gear 26 such that, in particular when the planetary gear sets 18 and 20 are driven, the ring gear 26 and the sun gear 30 rotate together and thus as a block both at the same or at identical angular velocity around the main axis of rotation 38 relative to the housing 12, in particular when the ring gear 26 and the sun gear 30 are not non-rotatably connected to the housing 12 .

(14) Furthermore, the second ring gear 34 is or can be non-rotatably coupled, in particular permanently, to the first planet carrier 24. In the first embodiment shown in FIG. 1, the ring gear 34 is non-rotatably coupled, in particular permanently, to the planet carrier 24, such that the planet carrier 24 and the ring gear 34 rotate, in particular together and thus as a block, relative to the housing 12 around the main axis of rotation 38 when the planetary gear sets 18 and 20 are driven and the planet carrier 24 and the ring gear 34 are not non-rotatably fixed to the housing 12.

(15) The drive device 10 further comprises an electric motor 40, depicted particularly schematically in FIG. 1, by means of which the motor vehicle can be electrically driven. By way of example, at least or exactly two wheels of the motor vehicle spaced apart from each other in the transverse direction of the vehicle can be driven electrically by means of the electric motor 40. By electrically driving the wheels, the motor vehicle as a whole can be electrically driven. For this purpose, the electric motor 40 comprises a stator 42, depicted particularly schematically in FIG. 1, and a rotor 44. The rotor 44 is rotatable around a machine rotation axis 46 relative to the stator 42. The machine rotation axis 46 runs in parallel to the main axis of rotation 38. In the first embodiment, the machine rotation axis 46 coincides with the main axis rotation 38. In particular, the rotor 44 can be driven by the stator 42 and thereby can be rotated around the machine rotation axis 46 relative to the stator 42. The electric motor 40 can be operated in an engine mode and thus as an electric engine. In the engine mode, the stator 42 drives the rotor 44, whereby the rotor 44 is rotated relative to the stator 42 around the machine rotation axis 46. Via the rotor 44, the electric motor 40 can provide torques for, in particular purely, electrically driving the wheels and thus the motor vehicle. This respective torque provided by the electric motor 40 via the rotor 44 for electrically driving the wheels is illustrated in FIG. 1 by an arrow 48.

(16) The drive device 10, in particular the planetary transmission 16, has an input shaft 50 permanently non-rotatably connected to the first sun gear 22, which input shaft can be driven by the rotor 44 and, in particular, can be rotated relative to the housing 12 around the main axis of rotation 38 or around the main axis of rotation 46. By way of example, the input shaft 50 is or can be non-rotatably connected, in particular permanently, to the rotor 44. The elements of the planetary gear sets 18 and 20 and the input shaft 50 are also referred to as components, for example. With reference to a torque flow running from the rotor 44 via the planetary transmission 16 to the wheels, via which torque flow the respective torque provided by the electric motor 40 via its rotor 44 is transmitted from the rotor 44 to the wheels, the input shaft is the first of the components to which the respective torque provided by the electric motor is transmitted. In other words, the input shaft 50 is arranged upstream of the other or all other components in the torque flow, such that the respective torque provided by the electric motor 40 via the rotor 44 is transmitted to the components initially or first to the input shaft 50 and only then to the respective remaining or other components. In this way, for example, the respective torque provided by the electric motor 40 can be introduced into the planetary transmission 16 via the input shaft 50.

(17) The drive device 10, in particular the planetary transmission 16, has an output shaft 52 that can be rotated relative to the housing 12, in particular around the main axis of rotation 38, and via which the planetary transmission 16 can provide torques in the form of output torques, in particular for driving the wheels. The respective output torque results from the respective torque provided by the electric motor 40. The respective output torque can be discharged from the planetary transmission 16 via the output shaft 52.

(18) The drive device 10 further comprises a differential gear 54, simply also referred to as a differential. The differential gear 54 is assigned to the axle, for example, and is thus simply also referred to as an axle gear. By way of example, the wheels of the axle can be driven by the electric motor 40 via the differential gear 54. Thus, the differential gear 54 has in particular the function of distributing the respective torque provided by the electric motor 40 to the wheels. The differential gear 54 also has the function, for example, of allowing speed compensation between the wheels or different speeds of the wheels when the motor vehicle is cornering. The differential gear 54 can be driven by the output shaft 52 or by the planetary transmission 16 via the output shaft 52, as will be explained in more detail below.

(19) The electric motor 40, the first planetary gear set 18, and the second planetary gear set 20 are advantageously arranged one after the other in the aforementioned sequence in the axial direction.

(20) Advantageously, the two planetary gear sets 18 and 20, the electric motor 40, and the differential gear 54 are all arranged coaxially with respect to one another.

(21) The drive device 10 has a first switching element 56, by means of which the first ring gear 26 can be non-rotatably connected to the housing 12. In addition, the drive device 10 has a second switching element 58 by means of which, in the first embodiment, the second planet carrier 32 can be non-rotatably connected to the housing 12. The planetary gear sets 18 and 20 are arranged coaxially with respect to the differential gear 54. Now, in order to be able to implement a particularly compact design as well as a particularly efficient operation of the drive device 10, the differential gear 54 comprises a ball-shaped differential 60, also referred to as a bevel gear differential and/or designed as a bevel gear differential, having a differential housing 62, also referred to as a differential basket or differential cage. In the embodiment, for example, the output shaft 52 is non-rotatably connected, in particular permanently, to the differential housing 62, and, for example, the ring gear 34 is also non-rotatably connected, in particular permanently, to the output shaft 52 and/or, in particular permanently, to the differential housing 62. Thus, for example, the ring gear 34 is non-rotatably connected, in particular permanently, to the planet carrier 24 via the differential housing 62 and/or via the output shaft 52.

(22) The respective output torque provided by the output shaft 52 can be transmitted to the differential housing 62, whereby the differential housing 62 can be or is driven. By driving the differential housing 62, the latter is rotated around the main axis of rotation 68, in particular relative to the housing 12.

(23) It can be seen from FIG. 1 that the ball-shaped differential 60 is characterized by the fact that the differential housing 62 delimits a receiving space 64, also referred to as a receiving area. The receiving space 64 is spherical or spherical in segments. The ball-shaped differential 60 is designed as a bevel gear differential which has two differential gears 66 and 68 rotatably mounted on the differential housing 62 and two output gears 70 and 72 that are rotatable, in particular, relative to the differential housing 62. The output gears 70 and 72 mesh simultaneously with the differential gears 66 and 68. The differential gears 66 and 68 and the output gears 70 and 72 are toothed gears which are designed as bevel gears. The gearwheels are at least partially, in particular at least predominantly or completely, arranged in the receiving space 64.

(24) The output gears 70 and 72 are non-rotatably connected, in particular permanently, to respective shafts 74 and 76, also referred to as side shafts. In this case, the aforementioned wheels of the motor vehicle can be driven via the shafts 74 and 76, such that the wheels can be driven via the shafts 74 and 76 by the output gears 70 and 72 and thus by the differential gear 54.

(25) In FIG. 1, respective arrows 78 and 80 illustrate a respective drive torque resulting from the respective output torque, by means of which the respective wheel or the respective shaft 74 or 76 can be or is driven. If the differential housing 62 is rotated around the main axis of rotation 38, in particular relative to the housing 12, the differential gears 66 and 68 are rotated around the main axis of rotation 38, in particular relative to the housing 12. Then, for example, the output gears 70 and 72 and, via these, the shafts 74 and 76 and thus the wheels are driven by the differential gears 66 and 68, whereby the motor vehicle can be driven as a whole.

(26) The differential housing 62 is permanently non-rotatably connected to the first planet carrier 24. Furthermore, the first sun gear 22 is arranged axially adjacent to the differential housing 62, wherein the largest outer diameter of the differential housing 62 is larger than an outer diameter, in particular than the largest outer diameter, of the first sun gear 22. This means, for example, that the differential housing 62 projects outwardly beyond the sun gear 22 in a radial direction perpendicular to the axial direction of the respective planetary gear set 18 or 20.

(27) The second sun gear 30 is arranged axially overlapping the differential housing 62, such that at least a part of the differential housing 62 is covered by the sun gear 30 in the radial direction of the respective planetary gear set 18 or 20 and thus in the radial direction of the drive device 10 towards the outside. An inner diameter of the second sun gear 30 is larger than the largest outer diameter of the differential housing 62. In particular, it is conceivable that at least a part of the differential housing 62, in particular the largest outer diameter of the differential housing 62, is arranged in the sun gear and is thus covered by the sun gear 30 in the radial direction outwards. Thus, for example, the sun gear 30 completely surrounds the aforementioned partial area of the differential housing 62 in the peripheral direction extending around the main axis of rotation 38. In other words, the differential housing 62, for example, penetrates the sun gear 30, in particular completely. Thus, the sun gear 30 is formed, for example, in the manner of a hollow shaft penetrated by the differential housing 62. The first switching element 56 is arranged radially surrounding and axially overlapping the first planetary gear set 18. Furthermore, the second switching element 58 is arranged axially between the first planetary gear set 18 and the second planetary gear set 20. In the first embodiment, the drive device 10 comprises a first axial bearing 82, by means of which the planet carrier 24 can be or is supported in the axial direction on the sun gear 30 and is thus mounted. In this case, the first axial bearing 82 is arranged in the axial direction between the planetary gear set 18 and the planetary gear set 20.

(28) The drive device 10 further comprises a second axial bearing 84, by means of which the second sun gear 30 can be or is supported in the axial direction on the second planet carrier 32 and is thus mounted, wherein the second axial bearing 84 can be arranged axially on the output side of the second planet carrier 32 of the second planetary gear set 20. Furthermore, a third axial bearing 86 is provided, by means of which the second planet carrier 32 can be or is supported in the axial direction on the ring gear 34 and is thus mounted. The third axial bearing 86 can be arranged axially on the outlet side of the second axial bearing 84.

(29) The drive device 10, in particular the planetary transmission 16, also has a fourth axial bearing 88, by means of which the first planet carrier 24 can be or is supported in the axial direction against the housing 12 and is thus mounted on the housing 12. The fourth axial bearing 88 can be arranged on the input side of the first planetary gear set 18.

(30) Furthermore, the drive device 10 comprises a fifth axial bearing 90, via which the second ring gear 34 can be or is supported in the axial direction on the housing 12 and is thus mounted. The fifth axial bearing 90 can be axially on the outward side of the second planetary gear set 20 and radially within the largest outer diameter of the differential housing 62, such that, for example, the differential housing 62 projects in the radial direction outwardly beyond the fifth axial bearing 90.

(31) In the first embodiment, the first switching element 56 is configured as a brake, in particular as a friction brake, and thereby as a lamella switching element, that is, as a lamella brake. Thus, for example, in the first embodiment, the ring gear 26 can be non-rotatably fixed to the housing 12 by means of the switching element 56, in particular exclusively, in a frictional- or force-fitting manner. In contrast, the second switching element 58 has at least one positive-locking element, such that in the first embodiment, the planet carrier 32 can be non-rotatably connected to the housing 12 by means of the switching element 58, at least or exclusively in a positive-locking manner. In the first embodiment, the switching element 58 is formed entirely or exclusively or completely as a positive-locking switching element, such that the planet carrier 32 can be non-rotatably connected to the housing 12 exclusively in a positive-locking manner by means of the switching element 58. The positive-locking element is, for example, a claw coupling, such that, for example, in the first embodiment, the switching element 58 is formed entirely or completely as a claw coupling. Furthermore, in the first embodiment, the first ring gear 26 is non-rotatably connected, in particular permanently, to the second sun gear 30. In addition, the second ring gear 34 is permanently non-rotatably connected to the first planet carrier 24, for example via the output shaft 52 and/or via the differential housing 62.

(32) Since the switching element 56 is designed as a lamella switching element, the switching element 56 has an inner lamella support and inner lamellae. The inner lamellae are or can be supported on the inner lamella carrier in the peripheral direction around the main axis of rotation 38, such that torques running around the main axis of rotation 38 can be transmitted between the inner lamellae and the inner lamella carrier. The inner lamella carrier is designated 92 in FIG. 1 and is formed integrally with the first ring gear 26. A connecting element 94 is provided, for example, which is non-rotatably connected to the second sun gear 30, in particular by means of a plug-in or welded connection. Thus, for example, the sun gear 30 and the connecting element 94 are separately formed parts that are non-rotatably connected to each other by means of a plug-in or welded connection. The connecting element 94 is thereby non-rotatably connected, in particular via a plug-in or welded connection, to the ring gear 26 and thus is non-rotatably connected to the inner lamella carrier 92. Thus, the ring gear 26 and the connecting element 94 are separately formed parts which are non-rotatably connected to each other, in particular via a plug-in or welded connection.

(33) The drive device 10 further comprises a parking lock 96, by means of which the output shaft 52 and thus, for example, the differential housing 62 can be non-rotatably connected to the housing 12 and can thus be secured against relative rotations occurring around the main axis of rotation 38 and relative to the housing 12. In this way, the wheels of the motor vehicle can also be secured against unwanted rotation, such that, for example, by means of the parking lock 96, unwanted rolling away of the motor vehicle can be prevented, in particular when the motor vehicle is parked on a slope. By way of example, the output shaft 52, also referred to as the drive shaft, also passes through the sun gear 30, such that, for example, the output shaft 52 is guided through under the second planetary gear set 20 in order to non-rotatably connect the output shaft 52, in particular permanently, to the planet carrier 24 and thus, for example, to an output of the planetary gear set 18. In this way, for example, a torsional rigidity of a connection between the parking lock 96 and the differential housing 62 can be kept low.

(34) Due to the arrangement of the axial bearings 82, 84, 86, 88 and 90, all axial forces in both directions coinciding with the axial direction can be transferred very well from the planetary transmission 16 into the housing 12. Particularly advantageous is the possibility of connecting the axial bearings 82, 84 and 86 on the same or similar diameter, such that an at least substantially straight-line force flow can be ensured. In the first embodiment illustrated in FIG. 1, the electric motor 40 is designed as an internal rotor, such that at least one longitudinal region of the rotor 44 is arranged inside the stator 42, or is covered by the 42 in the radial direction towards the outside. Of course, it is alternatively conceivable that the electric motor 40 is designed as an external rotor.

(35) The following embodiments, which are not shown in the figures, are kinematically equivalent to the exemplary embodiment shown or to the first embodiment: the switching element 58, which is designed, for example, as a brake, in particular a friction or lamella brake, can be converted into a fixed element and into a brake, in particular into a friction brake. By way of example, it is conceivable that the planet carrier 32 is permanently non-rotatably connected to the housing. Then, for example, a switching element is provided, by means of which the ring gear 34 can be non-rotatably connected to the planet carrier 24. Alternatively, it is conceivable that the planet carrier 32 is permanently non-rotatably connected to the housing 12, the ring gear 34 is permanently non-rotatably connected to the planet carrier 24 and then, for example, a switching element is provided by means of which the sun gear 30 can be non-rotatably connected to the ring gear 26.

(36) FIG. 2a shows a second embodiment, which can correspond to the first embodiment. In the second embodiment shown in FIG. 2a, the switching element 58 is designed overall or exclusively as a positive-locking switching element, in particular as a claw coupling, such that the aforementioned positive-locking element of the switching element 58 is a positive-locking connecting element or switching element. Thus, in the second embodiment, the planet carrier 32 can be non-rotatably connected to the housing 12 exclusively in a positive-locking manner by means of the switching element 58.

(37) FIG. 2b shows a third embodiment. In the third embodiment, the positive-locking element 98 of the switching element 58 is a positive-locking element such as a claw coupling. Furthermore, in the third embodiment, the switching element 58 comprises a frictional switching element 100 such as a brake, in particular a friction or lamella brake. Thus, in the third embodiment, the planet carrier 32 can be non-rotatably connected to the housing 12 by means of the switching element 58 both in a positive-locking manner (positive-locking element 98) and in a force-fitting or frictional manner (frictional switching element 100).

(38) FIG. 2c shows a fourth embodiment in which the positive-locking element of the switching element 58 is designed as a freewheel, in particular a switchable freewheel. In the fourth embodiment, the switching element 58 is designed as a whole or exclusively as a freewheel, in particular a switchable freewheel, by means of which the planet carrier 32 can be non-rotatably connected to the housing 12 in a first direction of rotation running around the main axis of rotation 38. In a second direction of rotation opposite to the first direction of rotation, the freewheel permits relative rotations between the planet carrier 32 and the housing 12. Since in the fourth embodiment the switching element 58 exclusively comprises the, in particular switchable, freewheel, in the fourth embodiment the planet carrier 32 can be non-rotatably connected to the housing 12 by means of the switching element 58 in the first direction of rotation exclusively in a positive-locking manner. FIG. 2d shows a fifth embodiment in which the positive-locking element designated 98 in FIG. 2d is designed as the previously described, in particular switchable, freewheel. In addition, as in the third embodiment, the switching element 58 comprises a frictionally engaged switching element 100 designed, for example, as a brake, in particular as a friction brake, or as a lamella switching element. Thus, in the fifth embodiment, the planet carrier 32 can be non-rotatably connected to the housing 12 by means of the switching element 58 both in a positive-locking manner (positive-locking element 98) and in a force-fitting or frictional manner (frictional switching element 100).

(39) FIG. 3 shows a sixth embodiment in which the switching element 56 is designed, in particular as a whole or exclusively, as a frictional or force-fitting switching element and thus, for example, as a lamella switching element. The switching element 56 is arranged radially above the planetary gear set 18, such that at least a part of the planetary gear set 18 is covered by the switching element 56 in the radial direction outwards. In this case, the inner lamella carrier 92 of the switching element 56, which is designed as a lamella switching element, is formed integrally with the connecting element 94, which in turn is non-rotatably connected, in particular permanently, to the second sun gear 30. By way of example, the ring gear 26 is formed integrally with the connecting element 94, or else the ring gear 26 and the connecting element 94 are formed as parts which are formed separately from each other and are non-rotatably connected to each other, in particular permanently. In particular, the ring gear 26 can be non-rotatably connected to the connecting element 54 by means of a plug-in or welded connection. Alternatively, or additionally, the sun gear 30 is non-rotatably connected to the connecting element 94 via a plug-in or welded connection, in particular permanently. Thus, for example, the sun gear 30 and the connecting element 94 are formed as separately formed and, in particular permanently, non-rotatably connected parts that are non-rotatably connected to each other via a plug-in or welded connection. Alternatively, or additionally, the ring gear 26 and the connecting element 94 are formed as separately formed and, in particular permanently, non-rotatably connected parts that are non-rotatably connected to each other, for example, via a plug-in or welded connection. In addition, it is preferably provided that the inner lamella carrier 92 and the connecting element 94 are formed integrally with each other. An advantageous decoupling can be ensured via the non-rotatable connection which is or can be implemented via a plug-in connection or welded connection.

(40) FIG. 4 shows a seventh embodiment, in which a connecting piece 102 in the form of a hollow shaft is provided. The connecting piece 102 is also referred to as a hollow shaft piece, which is arranged in the radial direction between the differential housing 62 and the sun gear 30 and is non-rotatably connected, in particular permanently, to the ring gear 34 and, in particular permanently, to the output shaft 52. In this case, the differential housing 62 is arranged at least partially, in particular at least predominantly or completely, in the hollow shaft piece, wherein the hollow shaft piece passes through the sun gear 30, which is designed as hollow shaft or in the manner of a hollow shaft, in particular completely. Via the connecting piece 102, the ring gear 34 and/or the parking lock 96 is permanently non-rotatably connected to the planet carrier 24, in particular bypassing the output shaft 52. In this way, a particularly advantageous elastic connection of the parking lock 96 and the ring gear 34 to the planet carrier 24 of the planetary gear set 18 and thus to its output can be implemented, namely by means of the second planetary gear set 20 and thereby by means of its sun gear 30.

(41) FIG. 5a shows an eighth embodiment. In the eighth embodiment, an overload clutch 104 is provided, for example in the form of a slip clutch, by means of which the differential housing 62 is non-rotatably connected to the ring gear 34 and/or to the parking lock 96. Finally, FIG. 5b shows a ninth embodiment in which an overload clutch 104, also referred to as a slip clutch or optionally designed as a slip clutch, is provided. By means of the overload clutch 104, the differential housing 62 is or can be non-rotatably connected to the parking lock 96, wherein, in the ninth embodiment, the differential housing 62 is permanently non-rotatably connected to the ring gear 34, bypassing the overload clutch 104. Thus, the overload clutch 104 is arranged between the differential housing 62, which is formed or designated as a differential basket or differential cage, for example, and the parking lock 96 or the second ring gear 34.

(42) The overload clutch 104 is preferably a lamella clutch, which slips or slides through slightly in the event of an overload. This prevents damage to the drive device 10 when the motor vehicle, which is heavy, for example, i.e., has a high weight, is stopped and parked on a hill and the parking lock 96 is engaged or locked. When the parking lock 96 is engaged, the overload clutch 104 slips slightly or a little in the case described above before the motor vehicle then comes to a complete stop. Both the ninth embodiment and the eighth embodiment and the seventh embodiment can protect the motor vehicle and in particular its drive train, which comprises for example the drive device 10, in the above case, i.e., when the heavy motor vehicle is stopped on a hill, in particular by simply engaging the parking lock 96.

(43) Although the invention has been illustrated and described in detail by way of preferred embodiments, the invention is not limited by the examples disclosed, and other variations can be derived from these by the person skilled in the art without leaving the scope of the invention. It is therefore clear that there is a plurality of possible variations. It is also clear that embodiments stated by way of example are only really examples that are not to be seen as limiting the scope, application possibilities or configuration of the invention in any way. In fact, the preceding description and the description of the figures enable the person skilled in the art to implement the exemplary embodiments in concrete manner, wherein, with the knowledge of the disclosed inventive concept, the person skilled in the art is able to undertake various changes, for example, with regard to the functioning or arrangement of individual elements stated in an exemplary embodiment without leaving the scope of the invention, which is defined by the claims and their legal equivalents, such as further explanations in the description.

REFERENCE NUMERAL LIST

(44) 10 drive device 12 housing 14 receiving space 16 planetary transmission 18 first planetary gear set 20 second planetary gear set 22 first sun gear 24 first planet carrier 26 first ring gear 28 first planetary gear 30 second sun gear 32 second planet carrier 34 second ring gear 36 second planetary gear 38 main axis of rotation 40 electric motor 42 stator 44 rotor 46 machine rotation axis 48 arrow 50 input shaft 52 output shaft 54 differential gear 56 first switching element 58 second switching element 60 ball-shaped differential 62 differential housing 64 receiving space 66 differential gear 68 differential gear 70 output gear 72 output gear 74 shaft 76 shaft 78 arrow 80 arrow 82 first axial bearing 84 second axial bearing 86 third axial bearing 88 fourth axial bearing 90 fifth axial bearing 92 inner lamella carrier 94 connecting element 96 parking lock 98 positive-locking element 100 frictional switching element 102 connecting piece 104 overload clutch