Electric drive system for a motor vehicle, in particular for a car, as well as motor vehicle

Abstract

Electric drive system (10) for a motor vehicle, comprising a first electric machine (12) with a first rotor (14), a second electric machine (20) with a second rotor (22), and a planetary coupling gear (30), wherein: - the coupling gear (30) comprises a first planet gear set (40) with a first ring gear (42), a first planet carrier (44) and a first sun gear (46) and a second planet gear set (50) with a second ring gear (52), a second planet carrier (54) and a second sun gear (56); - the first planet carrier (44) is connected to the second planet carrier (54) in a rotationally fixed manner; - with respect to an axial direction related to a first planetary gear set rotation axis (48), the first electric machine (12) is arranged on a side (S1) of the coupling gear (30) facing away from the second electric machine (20); - a connecting shaft (67) is provided, which is designed to connect the first planet carrier (44) rotationally fixedly to a first coupling half (K1) of a parking lock (72); and - a connection point (AS) for the rotationally fixed connection of the connecting shaft (67) to the first planet carrier (44) with respect to the axial direction is arranged between the first rotor (14) and the coupling gear (30); characterized in that: - a first output shaft (68) of the linkage (30) is provided, which is non-rotatably connected to the first ring gear (42), and whose first output shaft (68) is designed to transmit torques from the linkage (30) by bypassing the planet carriers (44, 54) and the sun gears (46, 56), such that the planet carriers (44, 54) and the sun gears (46, 56) are not arranged in a first torque flow downstream of the first output shaft (68); - a second output shaft (70) of the linkage (30) is provided, which is non-rotatably connected to the second ring gear (52), and whose second output shaft (70) is designed to transmit torques from the linkage (30) bypassing the planet carriers (44, 54) and the sun gears (46, 56), such that the planet carriers (44, 54) and the sun gears (46, 56) are not arranged in a second torque flow downstream of the second output shaft (70); and - the first coupling half (K1) is arranged with respect to the axial direction on a side of the second rotor (22) facing away from the coupling gear (30).

Description

[0001] The invention relates to an electric drive system for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1. Furthermore, the invention relates to a motor vehicle, in particular a motor vehicle, with at least or exactly one such electric drive system.

[0002] DE 10 2009 031 645 A1 discloses a drive unit for an electric vehicle, comprising a first electric motor for driving at least one wheel of the electric vehicle. Furthermore, US Pat. No. 9,494,218 B2 discloses an electric drive system with two electric motors and a planetary gear train.

[0003] The object of the present invention is to provide an electric drive system for a motor vehicle so that a parking lock can be implemented in a particularly simple manner.

[0004] This object is achieved by an electric drive system having the features of patent claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0005] A first aspect of the invention relates to an electric drive system, also referred to as an electric drive device or embodied as an electric drive device, for a motor vehicle, also simply referred to as a vehicle, in particular for a motor vehicle and very particularly for a passenger car. This means that the motor vehicle, in its fully manufactured state, has the electric drive system and can be driven, in particular purely electrically, by means of the electric drive system. For example, in its fully manufactured state, the motor vehicle has at least or exactly two axles arranged consecutively in the vehicle's longitudinal direction and thus one behind the other, also referred to as vehicle axles.The respective axle of the motor vehicle has at least or exactly two vehicle wheels, also referred to as wheels, wherein, for example, the vehicle wheels of the respective axle are arranged on opposite sides of the motor vehicle in the transverse direction of the motor vehicle. By means of the electric drive system, for example, the vehicle wheels of at least or exactly one of the axles or both axles can be driven, in particular purely electrically, whereby the motor vehicle as a whole can be driven. The vehicle wheels that can be driven by means of the electric drive system are also referred to as drivable wheels, driven wheels or drive wheels. When reference is made below to the vehicle wheels or the wheels, this means, unless otherwise stated, the vehicle wheels that can be driven by means of the electric drive system, i.e. the drive wheels.In particular, the vehicle wheels of the vehicle axles are ground contact elements by which the motor vehicle is or can be supported downwards on the ground in the vertical direction of the vehicle. If the motor vehicle is driven along the ground while being supported downwards on the ground in the vertical direction of the vehicle via the ground contact elements of the vehicle axles, the vehicle wheels of the vehicle axles roll, in particular directly, on the ground.

[0006] The electric drive system has a first electric machine which has a first rotor. For example, the first electric machine has a first stator, by means of which, for example, the first rotor can be driven and is therefore rotatable about a first machine axis of rotation relative to the first stator. In particular, the first electric machine can provide first drive torques for driving the vehicle wheels and thus the motor vehicle via the first rotor. The electric drive system also has a second electric machine with a second rotor. In particular, the second electric machine has a second stator, by means of which, for example, the second rotor can be driven and is therefore rotatable about a second machine axis of rotation relative to the second stator.In particular, the second electric machine can provide second drive torques via its second rotor, by means of which the vehicle wheels and thus the motor vehicle can be driven. For example, the machine's rotational axes run parallel to one another. In particular, the machine's rotational axes coincide, so that the electric machines are arranged coaxially to one another, for example.

[0007] The electric drive system also has a planetary gear train. The planetary gear train thus has a first planetary gear set, which has a first ring gear, a first planet carrier (also referred to as the first carrier), and a first sun gear. The planetary gear train also has a second planetary gear set, which has a second ring gear, a second planet carrier (also referred to as the second carrier), and a second sun gear. The first ring gear, the first planet carrier, and the first sun gear are transmission elements of the first planetary gear set or are also referred to as transmission elements of the first planetary gear set. The second ring gear, the second planet carrier, and the second sun gear are planetary gear set elements of the second planetary gear set or are also referred to as planetary gear set elements of the second planetary gear set.The electric drive system has, for example, a housing in which, for example, the coupling gear can be at least partially arranged. In particular when the respective gear element is not connected to the housing in a rotationally fixed manner, the respective gear element is rotatable about a first planetary gear set axis of rotation relative to the housing. In particular when the respective planetary gear set element is not connected to the housing in a rotationally fixed manner, the respective planetary gear set element is rotatable about a second planetary gear set axis of rotation relative to the housing. In this case, it is provided in particular that the planetary gear set axes of rotation run parallel to one another, or very preferably it is provided that the planetary gear set axes of rotation coincide, so that the planetary gear sets are preferably arranged coaxially to one another. For example, the respective machine axis of rotation runs parallel to the respective planetary gear set axis of rotation.In particular, it is provided that the respective machine axis of rotation coincides with the respective planetary gear set axis of rotation, so that the respective planetary gear set is preferably arranged coaxially to the respective electric machine. The first planet carrier is connected, in particular permanently, in a rotationally fixed manner to the second planet carrier, i.e. coupled. With regard to an axial direction of the electric drive system related to a first planetary gear set axis of rotation, the first electric machine is arranged on a first side of the coupling gear facing away from the second electric machine in the axial direction of the electric drive system. It is preferably provided that with regard to the axial direction of the electric drive system, the second electric machine is arranged on a second side of the coupling gear facing away from the first electric machine in the axial direction of the electric drive system.The axial direction of the electric drive system coincides with the respective machine axis of rotation and with the respective planetary gear set axis of rotation. With regard to the axial direction of the electric drive system, the first electric machine is preferably arranged on the first side of the coupling gear facing away from the second electric machine such that the first electric machine is at least partially overlapped by the coupling gear in a first direction running parallel to the axial direction of the drive system or coinciding with the axial direction of the electric drive system, which first direction runs or points from the first electric machine to the second electric machine. When reference is made above and below to the axial direction, this means the axial direction of the electric drive system, unless otherwise stated.In this regard, the term “axial” refers, unless otherwise stated, to the axial direction of the electric drive system. In other words, the term “axial” means, unless otherwise stated, the axial direction of the electric machine. Accordingly, with regard to the axial direction, the second electric machine is preferably arranged on the second side of the coupling gear facing away from the first electric machine in such a way that the second electric machine is at least partially overlapped by the coupling gear in a second direction running parallel to the axial direction or coinciding with the axial direction, opposite the first direction, which second direction runs or points from the second electric machine towards the first electric machine.

[0008] In the context of the present disclosure, the feature that two components, such as the first planet carrier and the second planet carrier, are connected to one another in a rotationally fixed manner, is to be understood as meaning that the components connected to one another in a rotationally fixed manner are arranged coaxially to one another and, in particular when the components are driven, rotate together or simultaneously and in particular with the same angular velocity about a component rotation axis common to the components, such as the first or the second planetary gear set rotation axis, in particular relative to the housing.The feature that two components are connected to one another in a torque-transmitting manner is to be understood as meaning that the components are coupled or connected to one another in such a way that torques can be transmitted between the components, whereby if the components are connected to one another in a rotationally fixed manner, the components are also connected to one another in a torque-transmitting manner.The feature that two components are permanently connected to one another in a torque-transmitting manner does not mean that a switching element is provided that can be switched between a coupled state connecting the components 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. Rather, the components are always and therefore permanently connected to one another in a torque-transmitting manner, i.e., such that torque can be transmitted between the components. Thus, for example, one of the components can be driven by the other component and vice versa.In particular, the feature that two components such as the first planet carrier and the second planet carrier are permanently connected to one another in a rotationally fixed manner is to be understood as meaning that a switching element is not provided which can be switched between a coupling state connecting the components to one another in a rotationally fixed manner and a decoupling state in which the components are decoupled from one another and can be rotated relative to one another, in particular about the component rotation axis, so that no torque can be transmitted between the components via the switching element, but rather the components are always or always, and therefore permanently connected or coupled to one another in a rotationally fixed manner.In other words, the term “rotationally fixed” means that two elements are connected to each other in a rotationally fixed manner if they are arranged coaxially to each other and are connected to each other in such a way that they rotate at the same angular velocity, in particular about the component rotation axis.

[0009] In particular, the electric drive system is a so-called electric dual drive, since one electric machine of the electric drive system is provided for each wheel of the vehicle axle comprising the electric drive system, in particular with the proviso that the vehicle axle comprising the electric drive system has exactly two vehicle wheels designed as ground contact elements. The electric drive system has a first switching element which is designed to connect the first rotor in a rotationally fixed manner to the second planet carrier. In other words, the first rotor can be connected in a rotationally fixed manner to the second planet carrier by means of the first switching element. For example, the first switching element can be switched between a first coupled state and a first uncoupled state. In the first coupled state, the first rotor is connected in a rotationally fixed manner to the second planet carrier by means of the first switching element.In the first decoupling state, the first shifting element permits relative rotations between the first rotor and the second planetary gear carrier about the first machine rotational axis or about the second planetary gear set rotational axis, such that in the first decoupling state, no torque can be transmitted between the first rotor and the second planetary carrier via the first shifting element. For example, the first shifting element can be moved, in particular translationally and / or relative to the housing, between at least one first coupling position causing the first coupling state and at least one first decoupling position causing the first decoupling state.

[0010] The electric drive system also comprises a connecting shaft, which is rotatable relative to the housing, in particular about a connecting shaft rotation axis. The connecting shaft rotation axis preferably runs parallel to the respective machine rotation axis and / or parallel to the respective planetary gear set rotation axis. Very preferably, the connecting shaft rotation axis coincides with the respective machine rotation axis and / or with the respective planetary gear set rotation axis. The connecting shaft is designed to connect the first planet carrier in a rotationally fixed manner to a first clutch half of a parking lock. Thus, it is provided that the planet carrier is or can be connected in a rotationally fixed manner to the first clutch half of the parking lock by means of the connecting shaft.It is provided that a connection point for the rotationally fixed connection of the connecting shaft to the first planetary carrier is arranged between the first rotor and the coupling gear in the axial direction. The connection point is understood to be a point at which the connecting shaft can be connected or, in particular, is permanently connected to the first planetary carrier in a rotationally fixed manner.

[0011] In order to be able to implement the parking lock particularly simply and, in particular, with particularly low installation space, it is provided according to the invention that the coupling gear and thus the electric drive system have a first output shaft which is, in particular permanently, connected in a rotationally fixed manner to the first ring gear. In particular, the first output shaft is provided in addition to the connecting shaft. The first output shaft is designed to transfer torques, also referred to as first torques or first output torques, from the coupling gear, bypassing the planet carriers and bypassing the sun gears. This means that the first torques can be transferred from the coupling gear via the first output shaft, bypassing the planet carriers and bypassing the sun gears.In other words, the coupling mechanism can provide the first torques bypassing the planet carriers and the sun gears. This means that, with respect to a first torque flow via which the coupling mechanism can provide the first torques, so that the first torques flow along the first torque flow, the planet carriers and the sun gears are not arranged downstream of the first output shaft in the first torque flow.

[0012] The coupling mechanism and thus the electric drive system also have a second output shaft, which is provided in particular in addition to the connecting shaft and in addition to the first output shaft and which is connected, in particular permanently, in a rotationally fixed manner to the second ring gear. The second output shaft is designed to transfer torques, also referred to as second torques or second output torques, from the coupling mechanism, bypassing the planet carriers and bypassing the sun gears. In other words, the second torques can be transferred from the coupling mechanism via the second output shaft, bypassing the sun gears and bypassing the planet carriers. In other words, the coupling mechanism can provide the second torques via the second output shaft, bypassing the planet carriers and bypassing the sun gears.This means that, with respect to a second torque flow along which the second torques are or can be output from the coupling gear via the second output shaft, so that the second torques flow or flow along the second torque flow, the planet carriers and the sun gears are not arranged downstream of the second output shaft in the second torque flow.

[0013] The parking lock is also referred to as a parking lock device or is a parking lock device. The first clutch half of the parking lock is also referred to as the first parking lock clutch half. For example, the parking lock has a second clutch half, which is also referred to as the second parking lock clutch half. For example, the second parking lock clutch half is connected, in particular permanently, to the housing in a rotationally fixed manner. For example, the parking lock clutch halves can be connected to one another in a rotationally fixed manner, whereby the connecting shaft and, via the connecting shaft, the planet carriers can be fixed to the housing in a rotationally fixed manner, thus being connected to the housing in a rotationally fixed manner.For this purpose, the parking lock comprises, for example, a parking lock element, also referred to as a parking lock switching part, which can be moved, for example, in particular relative to the housing and / or translationally, between at least one parking lock coupling position that effects a parking lock coupling state of the parking lock and at least one parking lock decoupling position that effects a parking lock decoupling state. In the parking lock coupling state, the parking lock coupling halves are connected to one another in a rotationally fixed manner, in particular by means of the parking lock element or via the parking lock element, whereby the connecting shaft and, via the connecting shaft, the planet carriers are connected to the housing in a rotationally fixed manner.

[0014] This engages, and therefore activates, the parking lock. In the parking lock decoupling state, the parking lock permits relative rotations about the connecting shaft rotation axis or about the respective planetary gear set rotation axis between the connecting shaft and the housing, and thus between the respective planetary carrier and the housing. Thus, in the parking lock decoupling state, the parking lock is disengaged, i.e., deactivated. For example, the parking lock element is one of the parking lock clutch halves, or the parking lock element is provided in addition to the parking lock clutch halves. It is conceivable that the first parking lock clutch half is connected, in particular permanently, to the connecting shaft in a rotationally fixed manner.Furthermore, it is conceivable that the first parking lock clutch half is axially fixedly connected to the connecting shaft, so that relative movements in the axial direction between the first parking lock clutch half and the connecting shaft are avoided.

[0015] The first output shaft is rotatable, for example, about a first output shaft axis of rotation relative to the housing. The second output shaft is rotatable, for example, about a second output shaft axis of rotation relative to the housing. The output shafts are preferably arranged coaxially to one another so that the output shaft axes of rotation coincide. The respective output shaft axis of rotation preferably runs parallel to the respective machine axis of rotation and / or parallel to the respective planetary gear set axis of rotation and / or parallel to the connecting shaft axis of rotation. Very preferably, the respective output shaft axis of rotation coincides with the respective machine axis of rotation and / or with the respective planetary gear set axis of rotation and / or with the connecting shaft axis of rotation. If the parking lock is engaged, the parking lock is in its engaged state. If the parking lock is disengaged, the parking lock is in its disengaged state.

[0016] In the invention, the parking lock, when engaged, acts indirectly, in particular simultaneously, on both output shafts. In the engaged state, both output shafts are secured against rotation relative to the housing by means of one parking lock. In particular, the parking lock, when engaged, secures the planetary carriers against rotation relative to the housing via the connecting shaft. Thus, in the invention, both output shafts can be secured against unwanted rotation by means of the same parking lock, so that the motor vehicle can be secured against unwanted rolling away when the parking lock is engaged.For this purpose, it is provided, for example, that a first of the drive wheels is connected, in particular permanently, to the first output shaft in a torque-transmitting manner, while a second of the drive wheels is connected, in particular permanently, to the second output shaft in a torque-transmitting manner. Thus, for example, the parking lock, in its engaged state, acts, in particular simultaneously, on both drive wheels, whereby the drive wheels are secured against rotation relative to the housing and thus, for example, relative to a body of the motor vehicle. This can secure the motor vehicle against unwanted rolling away.The motor vehicle structure, which may be designed as a self-supporting body, forms the interior of the motor vehicle, also known as the passenger cell or passenger compartment, in which persons such as the driver can remain while the motor vehicle is in motion. The invention makes it possible to use the same parking lock for both output shafts and thus for both drive wheels in order to secure the output shafts and thus the vehicle wheels against unwanted rotation, even though the electric drive system is designed as a dual drive. With conventional dual drives, a separate parking lock is required for each electric motor or each drive wheel, which can now be avoided by the invention.This means that the number of parts and thus the weight, costs and installation space requirements of the electric drive system can be kept to a particularly low level.

[0017] According to the invention, the electric drive system further comprises a second switching element, which is provided in particular in addition to the first switching device and is designed to connect the first rotor to the second rotor in a rotationally fixed manner. This means that the first rotor can be connected to the second rotor in a rotationally fixed manner by means of the second switching element. This makes it possible to achieve particularly advantageous switchability and thus particularly advantageous drivability of the drive system, wherein the parking lock can be designed in particular such that, in its engaged state, it acts on both output shafts simultaneously, thus fixing both output shafts in rotation relative to the housing. The second switching element can be switched, for example, between a second coupling state and a second decoupling state.In the second coupling state, the first rotor is connected to the second rotor in a rotationally fixed manner by means of the second switching element, such that relative rotations between the first rotor and the second rotor about the first or second machine rotational axis are prevented. In the second decoupling state, the second switching element permits relative rotations between the first rotor and the second rotor about the first or second machine rotational axis. For example, the second switching element is movable, in particular relative to the housing and / or translationally, between at least one second coupling position bringing about the second coupling state and at least one second decoupling position bringing about the second decoupling state.For example, the first switching element has a first switching part, which is movable, in particular displaceable, between the first coupling position and the first decoupling position, in particular in the axial direction of the electric drive system and / or relative to the housing. For example, the second switching element has a second switching part, which is movable, in particular translationally and / or relative to the housing, between the second coupling position and the second decoupling position. This allows the second switching element to be switched as needed.

[0018] In order to be able to implement the parking lock particularly favorably and to design it in such a way that the parking lock, in its engaged state, acts simultaneously on both output shafts and thus on both drive wheels, it is further provided according to the invention that the first clutch half of the parking lock, thus the first parking lock clutch half, is arranged on a side of the second rotor facing away from the coupling gear with respect to the axial direction of the electric drive system.

[0019] In particular, the invention enables an advantageous arrangement of the switching element and the parking lock as well as the other components relative to one another, so that the one parking lock in its engaged state can act simultaneously on both output shafts and thus both drive wheels and thus simultaneously secure both output shafts and thus both vehicle wheels against unwanted rotations and thus the motor vehicle as a whole against unwanted rolling away.

[0020] In a particularly advantageous embodiment of the invention, the first shifting element has clutch halves, which are also referred to as shifting element clutch halves. The shifting element clutch halves of the first shifting element are arranged between the coupling gear and the second rotor with respect to the axial direction of the electric drive system, whereby a particularly space-saving arrangement can be created, in particular such that the parking lock can be arranged in a space-saving manner and such that the parking lock, in its engaged state, acts simultaneously on both output shafts and thus both vehicle wheels. A first of the shifting element clutch halves is, for example, in particular permanently, connected in a rotationally fixed manner to the first rotor. A second of the shifting element clutch halves is, for example, in particular permanently, connected in a rotationally fixed manner to the second planet carrier.The first switching element comprises, for example, the first switching part, which is movable, in particular displaceable, between the first coupling position and the first decoupling position, in particular in the axial direction of the electric drive system and / or relative to the housing. The first switching part is, for example, a switching part provided in addition to the switching element coupling halves, or the first switching part is one of the switching element coupling halves of the first switching element.

[0021] A further embodiment is characterized in that the connecting shaft has a hollow shaft section, which is designed as a hollow shaft. The hollow shaft section is arranged radially outside the first output shaft in at least one region of its axial extent. In particular, it is provided that the hollow shaft section is penetrated in the axial direction by the first output shaft. This allows for a particularly space-efficient arrangement, wherein, at the same time, the parking lock can be arranged and designed such that, in its engaged state, the parking lock acts simultaneously on both output shafts.

[0022] In the context of the present disclosure, ordinal numerals, such as "first," "first," "second," "second," etc., are not necessarily used to indicate or imply a number or quantity of components, but rather to clearly reference terms to which the ordinal numerals are assigned or to which the ordinal numerals refer. Furthermore, the feature "axially overlapping" is to be understood as follows: Two elements are axially overlapping, in particular when arranged in regions of the same axial coordinates.Thus, with regard to two elements arranged axially overlapping with one another, there exists at least one radially arranged straight line, i.e. one running in the radial direction of the electric drive system and thus perpendicular to the axial direction of the drive system, which penetrates or intersects both one and the other of the axially overlapping elements. The radial direction of the electric drive system runs perpendicular to the axial direction of the electric drive system. When reference is made above and below to the radial direction, this means, unless otherwise stated, the radial direction of the electric drive system. Thus, unless otherwise stated, the term “radial” refers to the radial direction of the electric drive system. In other words, unless otherwise stated, the term “radial” means the radial direction of the electric drive system.

[0023] The feature that a first component is arranged radially outside a second component is to be understood as meaning that the first component is arranged further outward in the radial direction of the electric drive system, that is to say in particular further away from the respective machine rotational axis or the respective planetary gear set rotational axis, than the second component.

[0024] In order to be able to integrate the parking lock into the drive system in a particularly simple, space-saving, weight-saving and cost-effective manner, a further embodiment of the invention provides that the connecting shaft is permanently connected to the first planet carrier in a rotationally fixed manner.

[0025] A further embodiment is characterized in that the first parking lock coupling half of the parking lock is permanently connected to the connecting shaft in a rotationally fixed manner, whereby the parking lock can be integrated into the drive system in a particularly advantageous, cost-effective and space-saving manner.

[0026] A further embodiment is characterized by a third switching element, which is provided in particular in addition to the first switching element and in addition to the second switching element and is designed to connect the second sun gear to the first rotor in a rotationally fixed manner. In other words, the first rotor can be connected to the second sun gear in a rotationally fixed manner by means of the third switching element. This allows particularly advantageous drivability to be achieved in a particularly space-saving manner. In particular, the third switching element can be switched between a third coupled state and a third uncoupled state. In the third coupled state, the first rotor is connected to the second sun gear in a rotationally fixed manner by means of the third switching element.In the third decoupling state, the second switching element permits relative rotations between the first rotor and the second sun gear about the first machine rotational axis or about the second planetary gear rotational axis. For example, the third switching element is movable, in particular translationally and / or relative to the housing, between at least one third coupling position bringing about the third coupling state and at least one third decoupling position bringing about the third decoupling state. Very particularly, the third switching element has a third switching part which is movable, in particular translationally and / or relative to the housing, between the third coupling position and the third decoupling position.

[0027] Finally, it has proven to be particularly advantageous if the electric drive system has a fourth switching element, which is provided in particular in addition to the first switching element, in addition to the second switching element and in addition to the third switching element and is designed to connect the first sun gear to the second rotor in a rotationally fixed manner. In other words, the second rotor can be connected to the first sun gear in a rotationally fixed manner by means of the fourth switching element. This makes it possible to achieve particularly advantageous switchability and thus particularly advantageous drivability of the drive system, wherein at the same time the one parking lock, in its engaged state, can act on both output shafts simultaneously in order to simultaneously fix both output shafts and thus both drive wheels in rotation by means of the one parking lock and thus secure the motor vehicle against unwanted rolling away.

[0028] The fourth switching element can be switched, for example, between a fourth coupling position and a fourth decoupling state. In the fourth coupling position, the second rotor is connected in a rotationally fixed manner to the first sun gear by means of the fourth switching element, such that relative rotations between the second rotor and the first sun gear about the second machine axis of rotation or about the first planetary gear set axis of rotation are prevented. In the fourth decoupling state, the fourth switching element allows relative rotations between the second rotor and the first sun gear about the first machine axis of rotation or about the first planetary gear set axis of rotation. For example, the fourth switching element can be moved, in particular translationally and / or relative to the housing, between at least one fourth coupling position bringing about the fourth coupling position and at least one fourth decoupling position bringing about the fourth decoupling state.For example, the fourth switching element has a fourth switching part which is movable, in particular in the axial direction of the electric drive system and / or relative to the housing, between the fourth coupling position causing the fourth coupling position and the fourth decoupling position causing the fourth decoupling state.

[0029] A second aspect of the invention relates to a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car, and has at least or precisely one electric drive system according to the first aspect of the invention and can be driven, in particular purely electrically, by means of the electric drive system. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

[0030] Further advantages, features, and details of the invention will become apparent from the following description of a preferred embodiment and from the drawings. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respective specified combinations, but also in other combinations or on their own, without departing from the scope of the invention.

[0031] The drawing shows: Fig. 1 is a schematic representation of an electric drive system for a motor vehicle; and Fig. 2 a switching table to illustrate different operating modes of the electric drive system.

[0032] Fig. 1 shows a schematic representation of an electric drive system 10 for a motor vehicle, also simply referred to as a vehicle. The electric drive system 10 has a first electric machine 12, which has a first rotor 14 and a first stator 16. The rotor 14 is drivable by means of the stator 16 and is thereby rotatable about a first machine rotational axis 18 relative to the stator 16. In the present case, the first electric machine 12 is designed as an axial flux machine. The electric drive system 10 also comprises a second electric machine 20, which has a second rotor 22 and a second stator 24. The rotor 22 is drivable by means of the stator 24 and is thereby rotatable about a second machine rotational axis 26 relative to the stator 24. It can be seen that the electric machines 12 and 20 are arranged coaxially to one another, so that the machine rotational axes 18 and 26 coincide. Particularly schematically in Fig. 1 also shows a housing 28 of the electric drive system 10. The electric machine 20 is also designed as an axial flux machine (AFM). For example, the respective electric machine 12, 20 is at least partially arranged in the housing 28. The rotors 14 and 22 are rotatable about the respective machine rotational axes 18, 26 relative to the housing 28.

[0033] The electric drive system 10 comprises a planetary-type coupling gear 30. For example, the coupling gear 30 is at least partially arranged in the housing 28. For example, the electric drive system 10 is a component of an axle 32 of the motor vehicle, also referred to as the vehicle axle or drive axle. The axle 32 has, in particular, two vehicle wheels 34 and 36, which are arranged on opposite sides of the motor vehicle in the transverse direction of the motor vehicle. The transverse direction of the vehicle is illustrated by a double arrow 38. The vehicle wheels 34 and 36, also simply referred to as wheels or drive wheels, are ground contact elements by means of which the motor vehicle can be or is supported downwards on a ground in the vertical direction of the motor vehicle.If the motor vehicle is driven along the ground while supported vertically downwards by the drive wheels, the drive wheels roll, in particular directly, on the ground. The vehicle wheels 34 and 36 can be driven, in particular purely electrically, by the respective electric motor 12, 20 via the coupling gear 30, so that the vehicle wheels 34 and 36 are also referred to as drive wheels.

[0034] The coupling gear 30 has a first planetary gear set 40, which has a first ring gear 42, a first planet carrier 44, and a first sun gear 46. The ring gear 42, the planet carrier 44, and the sun gear 46 are transmission elements of the first planetary gear set 40, wherein the respective transmission element is rotatable about a first planetary gear set rotation axis 48 relative to the housing 28, particularly when it is not rotationally fixedly connected to the housing 28. The coupling gear 30 has a second planetary gear set 50, which has a second ring gear 52, a second planet carrier 54, and a second sun gear 56. The ring gear 53, the planet carrier 54 and the sun gear 56 are planetary gear set elements of the second planetary gear set 50, wherein the respective planetary gear set element, when it is not connected in a rotationally fixed manner to the housing 28, is rotatable about a second planetary gear set rotation axis 58 relative to the housing 28.The planetary gear sets 40 and 50 are arranged coaxially with one another, so that the planetary gear set rotation axes 48 and 58 coincide. Furthermore, the planetary gear sets 40 and 50 are arranged coaxially with the electric machines 12 and 20, so that the planetary gear set rotation axes 48 and 58 coincide with the machine rotation axes 18 and 26. First planet gears 60 and second planet gears 62 are rotatably arranged, i.e., held, on the first planet carrier 44, with the first planet gears 60 meshing, in particular permanently, with the first sun gear 46. The second planetary gears 62 mesh, in particular permanently, with the ring gear 42, and in each case one of the first planetary gears 60 meshes, in particular permanently, with, in particular precisely, a respective one of the second planetary gears 62. In this case, for example, the respective second planetary gear 62 has a respective first toothing which meshes, in particular permanently, with the ring gear 42 and with the respective first planetary gear 60.The respective planetary gear does not mesh, for example, with the sun gear 46. The respective planetary gear 60 does not mesh, for example, with the ring gear 42. The second planetary gears 62 are rotatably mounted on the second planet carrier 54, and third planetary gears 64 are rotatably mounted on the second planet carrier 54. The second planetary gears 62 mesh, in particular permanently, with the sun gear 56. The third planetary gears 64 mesh, in particular permanently, with the ring gear 52. Furthermore, one of the second planetary gears 62 meshes, in particular permanently, in particular precisely, with one of the respective third planetary gears 64. In this case, for example, the respective second planetary gear 62 has a respective second toothing, provided in particular in addition to the respective first toothing, which meshes with the sun gear 56 and with the respective third planetary gear 64.The respective planetary gear 60 does not mesh, for example, with the ring gear 42, and the respective planetary gear 62 does not mesh, for example, with the sun gear 46. The respective planetary gear 62 does not mesh, for example, with the ring gear 52, and the respective planetary gear 64 does not mesh, for example, with the sun gear 56. In particular, the respective second planetary gear 62 is designed as a respective stepped planetary gear.

[0035] The first planet carrier 44 is connected, in particular permanently, in a rotationally fixed manner to the second planet carrier 54. With respect to an axial direction of the electric drive system 10, the first electric machine 12 is arranged on a first side S1 of the coupling gear 30, facing away from the second electric machine 20 in the axial direction of the electric drive system 10, and with respect to the axial direction of the electric drive system 10, the second electric machine 20 is arranged on a second side S2 of the coupling gear 30, facing away from the first electric machine 12 and from the first side S1 in the axial direction of the electric drive system 10. When reference is made above and below to the axial direction, this refers, unless otherwise stated, to the axial direction of the electric drive system 10, the radial direction of which runs perpendicular to the axial direction.The axial direction of the electric drive system 10 coincides with the respective machine rotational axis 18, 26 and thus with the respective planetary gear set rotational axis 48, 58. The radial direction of the electric drive system 10 is illustrated by a double arrow 66.

[0036] The electric drive system 10 has a first switching element SE1, which is designed to connect the first rotor 14 in a rotationally fixed manner to the second planet carrier 54 and, via the second planet carrier 54, in a rotationally fixed manner to the first planet carrier 44.

[0037] The electric drive system 10 has a connecting shaft 67, which is rotatable about a connecting shaft rotation axis relative to the housing 28. It can be seen that the connecting shaft 67 is arranged coaxially with the electric machines 12 and 20 and coaxially with the planetary gear sets 40 and 50, so that the connecting shaft rotation axis 69 coincides with the machine rotation axes 18 and 26 and with the planetary gear set rotation axes 48 and 58. The connecting shaft 67 is designed to connect the first planet carrier 44 in a rotationally fixed manner to a first clutch half K1 of a parking lock 72 of the electric drive system 10. For this purpose, in the exemplary embodiment shown in the figures, it is provided that the connecting shaft 67 is connected, in particular permanently, in a rotationally fixed manner to the planet carrier 44 and, via the latter, in particular permanently, in a rotationally fixed manner to the planet carrier 54.Furthermore, in the exemplary embodiment shown in the figures, the first clutch half K1 of the parking lock 72 is, in particular permanently, connected in a rotationally fixed manner to the connecting shaft 67, so that the first clutch half K1 is permanently connected in a rotationally fixed manner to the planet carriers 44 and 54. The first clutch half K1 of the parking lock 72 is also referred to as the first parking lock clutch half. The parking lock 72 has a second clutch half K2, which is also referred to as the second parking lock clutch half. In the exemplary embodiment shown in the figures, the second parking lock clutch half is, in particular permanently, connected in a rotationally fixed manner to the housing 28.Furthermore, in the electric drive system 10, it is provided that a connection point AS for the rotationally fixed connection of the connecting shaft 67 to the first planet carrier 44 is arranged between the first rotor 14 and the coupling gear 30 with respect to the axial direction of the electric drive system 10. In the exemplary embodiment shown in the figures, it is provided that the planet carrier 44 and the connecting shaft 67, which is formed in particular separately from the planet carrier 44, are connected to one another at the connection point AS, in particular permanently, in a rotationally fixed manner.

[0038] The coupling gear 30 and thus the electric drive system 10 have a first output shaft 68, which is connected, in particular permanently and non-rotatably, to the first rotor 14 and is designed to transfer torques, also referred to as first torques, from the coupling gear 30, bypassing the planet carriers 44 and 54 and bypassing the sun gears 46 and 56. The coupling gear 30 and thus the electric drive system 10 also comprise a second output shaft 70, which is connected, in particular permanently and non-rotatably, to the second ring gear 52 and is designed to transfer torques, also referred to as second torques, from the coupling gear 30, bypassing the planet carriers 44 and 54 and bypassing the sun gears 46 and 56. It can be seen that the vehicle wheel 34 can be driven by the output shaft 68 and thus via the output shaft 68 by the coupling gear 30 and via this by the respective electric machine 12, 20.Accordingly, the vehicle wheel 36 can be driven by the output shaft 70 and thus, via the output shaft 70, by the coupling gear 30 and, via the coupling gear 30, by the respective electric machine 12, 20. For example, the coupling gear 30 is, forms, or comprises a central superposition unit, by means of which a respective first drive torque, provided or capable of being provided by the electric machine 12 via its rotor 14 and intended for driving the vehicle wheels 34 and 36, can be superimposed on a respective second drive torque, provided or capable of being provided by the electric machine 20 via its rotor 22 and intended for driving the vehicle wheels 34 and 36, such that a particularly efficient drive of the motor vehicle can be achieved.

[0039] The electric drive system 10 comprises a second switching element SE2, which is designed to connect the first rotor 14 in a rotationally fixed manner to the first sun gear 46. Furthermore, it is provided that the first clutch half K1 (first parking lock clutch half) is arranged on a side SE3 of the second rotor 22 facing away from the coupling gear 30, in particular in the axial direction of the electric drive system 10.

[0040] The switching element SE1 has a first switching element coupling half SK1 and a second switching element coupling half SK2, wherein the switching element coupling halves SK1 and SK2 are also simply referred to as coupling halves of the first switching element SE1. Fig. 1 shows that the shift element coupling halves SK1 and SK2 of the first shift element SE1 are arranged between the coupling gear 30 and the second rotor 22 with respect to the axial direction of the electric drive system 10. Furthermore, the connecting shaft 67 has a hollow shaft section 73, which, viewed individually, is designed as a hollow shaft and is penetrated, for example, in particular completely, by the output shaft 68.

[0041] The electric drive system 10 has the parking lock 72, which has the first clutch half K1, which is connected, in particular permanently, in a rotationally fixed manner to the connecting shaft 67 and, via it, to the planetary carrier 44, and the second clutch half K2, which is connected, in particular permanently, in a rotationally fixed manner to the housing 28. The parking lock 72, which is also designated P, can be switched between an engaged state and a disengaged state. In its engaged state, the parking lock 72 is engaged, i.e., activated, and in its disengaged state, the parking lock 72 is disengaged, i.e., deactivated. The engaged state is also referred to as the parking lock coupling state, and the disengaged state is also referred to as the parking lock decoupling state.The parking lock 72 has, for example, a parking lock switching part that is movable, in particular translationally and / or rotationally and / or relative to the housing 28, between at least one parking lock coupling position that effects the parking lock coupling state and at least one parking lock decoupling position that effects the parking lock decoupling state. For example, the parking lock switching part is provided in addition to the clutch halves K1 and K2, or the parking lock switching part is one of the clutch halves K1 and K2.Thus, for example, one of the parking lock clutch halves, thus one of the clutch halves K1 and K2, can be moved, in particular in the axial direction of the electric drive system 10 and / or translationally and / or rotationally and / or relative to the respective other parking lock clutch half and / or relative to the housing 28, between the at least one parking lock coupling position causing the parking lock coupling state and the at least one parking lock decoupling position causing the parking lock decoupling state. In the engaged state of the parking lock 72, the parking lock clutch halves (the clutch halves K1 and K2) are connected to one another in a rotationally fixed manner, whereby the connecting shaft 67 and, via this, the planet carrier 44 and the planet carrier 54 are connected to the housing 28 in a rotationally fixed manner.In the disengaged state, the parking lock 72 permits relative rotations between the connecting shaft 67 and the housing 28, and thus between the respective planet carrier 44, 54 in the housing 28, in particular about the machine rotation axis 18, 26 or about the connecting shaft rotation axis 69 or about the planetary gear set rotation axis 48, 58.

[0042] The shift element coupling half SK1 is, for example, in particular permanently, connected in a rotationally fixed manner to the rotor 14. The shift element coupling half SK2 is, for example, in particular permanently, connected in a rotationally fixed manner to the planet carrier 54 and thus, through the intermediary of the planet carrier 54, in particular permanently, connected in a rotationally fixed manner to the planet carrier 44. The first shift element SE1 can be switched, for example, between a first coupling state and a first decoupling state. In the first coupling state, the first rotor 14 is rotationally fixedly connected to the second planet carrier 54 by means of the first shift element SE1.For example, the first switching element SE1 has a first switching part which is movable, in particular relative to the housing 28 and / or in the axial direction of the electric drive system 10 and / or translationally, between at least one first coupling position causing the first coupling state and at least one first decoupling position causing the first decoupling state. The first switching part can be provided in addition to the switching element coupling halves SK1 and SK2, or the first switching part is one of the switching element coupling halves SK1 and SK2. Thus, for example, one of the switching element coupling halves SK1 and SK2 can be moved, in particular relative to the housing 28 and / or in the axial direction of the drive system 10 and / or translationally, between the at least one first coupling position causing the coupling state and the at least one first coupling position causing the first decoupling state.

[0043] In the exemplary embodiment shown in the figures, the electric drive system 10 has a third switching element SE3, which is designed to connect the second sun gear 56 in a rotationally fixed manner to the first rotor 14. Furthermore, a fourth switching element SE4 is provided, which is designed to connect the first sun gear 46 in a rotationally fixed manner to the second rotor 22.

[0044] The second switching element SE2 can be switched between a second coupled state and a second uncoupled state. In the second coupled state, the first rotor 14 is connected in a rotationally fixed manner to the first sun gear 46 by means of the second switching element SE2. In the second uncoupled state, the second switching element SE2 permits relative rotations between the first rotor 14 and the first sun gear 46 about the machine rotation axis 18. The third switching element SE3 is designed to connect the first rotor 14 in a rotationally fixed manner to the second sun gear 56. The third switching element SE3 has a third switching element coupling half SK3, which is connected, in particular permanently, in a rotationally fixed manner to the first rotor 14. Furthermore, the third switching element SE3 has a fourth switching element coupling half SK4, which is connected, in particular permanently, in a rotationally fixed manner to the sun gear 56.In the first coupling state of the first shifting element SE1, the shifting element coupling halves SK1 and SK2 are connected to one another in a rotationally fixed manner. In the first uncoupling state of the first shifting element SE1, the shifting element coupling halves SK1 and SK2 are rotatable relative to one another, in particular about the machine rotation axis 18.

[0045] The fourth switching element SE4 can be switched between a fourth coupling state and a fourth decoupling state. In the fourth coupling state, the second rotor 22 is rotationally fixedly connected to the first sun gear 46 by means of the fourth switching element SE4. In the fourth decoupling state, the fourth switching element SE4 permits relative rotations between the second rotor 22 and the first sun gear 46 around the machine rotation axis 26.

[0046] In the third coupling state, the shifting element coupling halves SK3 and SK4 are connected to one another in a rotationally fixed manner, whereby in the third coupling state the first rotor 14 and the second sun gear 56 are connected to one another in a rotationally fixed manner. In the third uncoupling state, the shifting element coupling halves SK3 and SK4 are rotatable relative to one another, in particular about the machine rotation axis 18, so that in the third uncoupling state the first rotor 14 and the second sun gear 56 are rotatable relative to one another, in particular about the machine rotation axis 18. For example, the third shifting element SE3 has a second switching part, which is movable, in particular in the axial direction of the electric drive system 10 and / or translationally and / or relative to the housing 28, between at least one second coupling position bringing about the third coupling state and at least one second uncoupling position bringing about the third uncoupling state.The second switching part can be provided in addition to the switching element coupling halves SK3 and SK4, or the second switching part is one of the switching element coupling halves SK3 and SK4. Thus, it can be provided in particular that one of the switching element coupling halves SK3 and SK4 is movable, in particular translationally movable and thus displaceable, in particular in the axial direction of the electric drive system 10 and / or translationally and / or relative to the housing 28, between the at least one second coupling position causing the third coupling state and the at least one second decoupling position causing the third decoupling state, so that one of the switching element coupling halves SK3 and SK4 is the second switching part of the switching element SE2.In the first embodiment, for example, the second switching part is connected to the first switching part in a rotationally fixed manner, and the first switching part is fixedly connected to the second switching part, for example in the axial direction of the electric drive system 10, so that relative movements between the first switching part and the second switching part, particularly in the axial direction of the electric drive system 10, are prevented. In particular, the second switching part can move along with the first switching part. For example, it is provided that the first switching part is the switching element coupling half SK1, and the second switching part is the switching element coupling half SK3.In particular, it is provided that the first switching part and the second switching part are movable together and thus simultaneously, in particular in the axial direction of the electric drive system 10, such that the second switching part is in the second decoupling position when the first switching part is in the first coupling position, and that the second switching part is in the second coupling position when the first switching part is in the first decoupling position. Thus, the second decoupling position coincides with the first coupling position, and the second coupling position coincides with the first decoupling position.

[0047] For example, the electric drive system 10 has different modes, which are also referred to as operating modes. The drive system 10 can be operated selectively in the different operating modes. Therefore, Fig.2 shows a switching table which has a column SP1 in which the modes are entered. A first of the modes is designated M1, a second of the modes is designated M2, a third of the modes is designated M3, a fourth of the modes is designated M4, and a fifth of the modes is designated M5. The parking lock 72, designated P, and the switching elements SE1, SE2, SE3, and SE4 are entered in a row Z. In the first mode M1, the parking lock 72 is engaged, whereby the motor vehicle is secured against unwanted rolling away. For this purpose, the parking lock 72 is in its engaged state, thus in the parking lock coupling state, while the first switching element SE1 is in its first uncoupled state, the switching element SE2 is in its second uncoupled position, the switching element SE3 is in its third uncoupled state, and the switching element SE4 is in its fourth uncoupled state.It is preferably provided that when and preferably always when the second switching element SE2 is in its second coupling state, the fourth switching element is in its fourth decoupling state. Furthermore, it is preferably provided that when and preferably always when the second switching element SE2 is in its second decoupling state, the fourth switching element SE4 is in its fourth decoupling state. The second mode M2 ​​is, for example, an efficiency mode in which the parking lock 72 is in its parking lock decoupling state, while the switching element SE1 is in its first coupling state, and the switching elements SE2, SE3 and SE4 are in their decoupling states.The third mode M3 is, for example, an overlay mode in which the parking lock 72 is in its parking lock decoupling state, while the switching elements SE1 and SE4 are in their coupling states and the switching elements SE2 and SE3 are in their decoupling states. The fourth mode M4 is, for example, an efficiency support mode, also referred to as efficiency boost mode, in which the parking lock 72 is in its parking lock decoupling state, while the switching elements SE1 and SE3 are in their coupling states and the switching elements SE2 and SE4 are in their decoupling states. The fifth mode M5 is, in particular, a torque shift and summing mode in which the parking lock 72 is in its parking lock decoupling state, while the switching elements SE2 and SE4 are in their coupling states and the switching elements SE1 and SE3 are in their decoupling states.

[0048] It can be seen that the ring gears 42 and 52 are or represent outputs of the coupling gear 30, since the torques from the coupling gear 30 can be transmitted via the ring gears 42 and 52. In addition, the electric machines 12 and 20 are arranged on both sides of the coupling gear 30 in the axial direction. Due to these circumstances, the planet carriers 44 and 54 and shafts connected in a rotationally fixed manner to the planet carriers 44 and 54, also referred to as web shafts, to which the parking lock 72 or the first clutch half K1 could advantageously be connected, are difficult or impossible to access, in particular because they are covered or concealed from the outside by the output shafts 68 and 70 or by any provided drive shafts and associated switching elements.Despite these circumstances, it is possible in the electric drive system 10 for the one parking lock 72 to act simultaneously on both output shafts 68 and 70 and thus on both vehicle wheels 34 and 36, in particular such that when the parking lock 72 is engaged, the output shafts 68 and 70 and thus the vehicle wheels 34 and 36 are secured against unwanted rotation. The parking lock 72 is engaged for this purpose. This advantageously secures the motor vehicle against unwanted rolling away, particularly when parked on or near a slope, and avoids the need for a separate, separately provided parking lock for each output shaft 68, 70. Thus, the number of parts, costs, and weight can be kept particularly low.

[0049] The drive system 10 has a first gear ratio 74, which, with respect to a first torque flow along or via which the respective first torque can be transmitted from the output shaft 68 to the first vehicle wheel 34, is arranged downstream of the first output shaft 68 and downstream of the coupling gear 30 and upstream of the vehicle wheel. Accordingly, the drive system 10 has a second gear ratio 78, which, with respect to a second torque flow along or via which the respective second torque can be transmitted from the output shaft 70 to the second vehicle wheel 36, is arranged downstream of the second output shaft 70 and downstream of the coupling gear 30 and upstream of the second vehicle wheel 36 in the second torque flow.For example, the respective gear ratio 74, 78 is designed as a respective third planetary gear set, which has a respective third sun gear 80, a respective third planet carrier 82, and a respective third ring gear 84. Respective further planet gears 86 are rotatably arranged, i.e., held, on the respective planet carrier 82, wherein the respective planet gear 86 simultaneously meshes with the respective sun gear 80 and the respective ring gear 84 of the respective gear ratio 74, 78. In the present case, the first output shaft 68 is connected, in particular permanently, in a rotationally fixed manner to the sun gear 80 of the gear ratio 74, and the second output shaft 70 is connected, in particular permanently, in a rotationally fixed manner to the sun gear 80 of the gear ratio 78. The respective ring gear 84 is connected, in particular permanently, in a rotationally fixed manner to the housing 28.The respective planetary carrier 82 is connected, in particular permanently, in a rotationally fixed manner to a respective further shaft 88, from which the respective vehicle wheel 34, 36 can be driven. In particular, the respective shaft 88 is permanently connected to the respective vehicle wheel 34, 36 in a torque-transmitting, in particular permanently rotationally fixed manner. List of reference symbols 10 electric drive system 12 first electric machine 14 first rotor 16 first stator 18 first machine rotation axis 20 second electric machine 22 second rotor 24 second stator 26 second machine rotation axis 28 housings 30 coupling gears 32 Axis 34 vehicle wheel 36 vehicle wheel 38 Double arrow 40 first planetary gear set 42 first ring gear 44 first planet carrier 46 first sun gear 48 first planetary gear set rotation axis 50 second planetary gear set 52 second ring gear 54 second planet carrier 56 second sun gear 58 second planetary gear set rotation axis 60 first planetary gear 62 second planet gear 64 third planet gear 66 Double arrow 67 Connecting shaft 68 first output shaft 70 second output shaft 72 Parking lock 74 first translation level 78 second translation stage 80 third sun gear 82 third planet carrier 84 third ring gear 86 additional planetary gear S1 first page S2 second page S3 page SE1 first switching element SE2 second switching element SE3 third switching element SE4 fourth switching element M1 first mode M2 second mode M3 third mode M4 fourth mode M5 fifth mode SP1 column Z line

Claims

[1] An electric drive system (10) for a motor vehicle, comprising a first electric machine (12) with a first rotor (14), a second electric machine (20) with a second rotor (22), and a planetary gear coupling (30), wherein: - the coupling gear (30) has a first planetary gear set (40) with a first ring gear (42), a first planet carrier (44) and a first sun gear (46) and a second planetary gear set (50) with a second ring gear (52), a second planet carrier (54) and a second sun gear (56); - the first planet carrier (44) is connected in a rotationally fixed manner to the second planet carrier (54); - with respect to an axial direction related to a first planetary gear set rotation axis (48), the first electric machine (12) is arranged on a side (S1) of the coupling gear (30) facing away from the second electric machine (20); - a connecting shaft (67) is provided which is designed to connect the first planet carrier (44) in a rotationally fixed manner to a first coupling half (K1) of a parking lock (72); and - a connection point (AS) for the rotationally fixed connection of the connecting shaft (67) to the first planet carrier (44) is arranged between the first rotor (14) and the coupling gear (30) with respect to the axial direction; characterized by , that: - a first output shaft (68) of the coupling gear (30) is provided, which is connected in a rotationally fixed manner to the first ring gear (42), the first output shaft (68) of which is designed to transfer torques from the coupling gear (30) bypassing the planet carriers (44, 54) and bypassing the sun gears (46, 56), such that the planet carriers (44, 54) and the sun gears (46, 56) are not arranged in a first torque flow downstream of the first output shaft (68); - a second output shaft (70) of the coupling gear (30) is provided, which is connected in a rotationally fixed manner to the second ring gear (52), the second output shaft (70) of which is designed to transfer torques from the coupling gear (30) bypassing the planet carriers (44, 54) and the sun gears (46, 56), such that the planet carriers (44, 54) and the sun gears (46, 56) are not arranged in a second torque flow downstream of the second output shaft (70); and - the first coupling half (K1) is arranged with respect to the axial direction on a side of the second rotor (22) facing away from the coupling gear (30). [2] Electric drive system (10) according to claim 1, characterized bythat a first switching element (SE1) is provided which is designed to connect the first rotor (14) in a rotationally fixed manner to the second planet carrier (54), and that a second switching element (SE2) is provided which is designed to connect the second rotor (22) in a rotationally fixed manner to the first rotor (14). [3] Electric drive system (10) according to claim 2, characterized by that coupling halves of the first switching element (SE1) are arranged with respect to the axial direction between the coupling gear (30) and the second rotor (22). [4] Electric drive system (10) according to one of the preceding claims, characterized by that the connecting shaft (67) has a hollow shaft section (73) which is arranged radially outside the first output shaft (68) in at least one region of its axial extent. [5] Electric drive system (10) according to one of the preceding claims, characterized bythat the connecting shaft (67) is permanently connected to the first planet carrier (44) at the connection point (AS) in a rotationally fixed manner. [6] Electric drive system (10) according to one of the preceding claims, characterized by that the first coupling half (K1) of the parking lock (72) is permanently connected to the connecting shaft (67) in a rotationally fixed manner. [7] Electric drive system (10) according to one of the preceding claims, characterized by a third switching element (SE3) which is designed to connect the second sun gear (56) in a rotationally fixed manner to the first rotor (14). [8] Electric drive system (10) according to one of the preceding claims, characterized by a fourth switching element (SE4) which is designed to connect the first sun gear (46) to the second rotor (22) in a rotationally fixed manner. [9] Motor vehicle, with at least one electric drive system (10) according to one of the preceding claims.

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