DE102021005017A1 - Electric drive device for a motor vehicle, in particular for a motor vehicle, and motor vehicle - Google Patents

Abstract

The invention relates to an electric drive device (10) for a motor vehicle, comprising: an electric machine (12) which is designed to drive the motor vehicle and has a rotor (14), with a planetary gear (22) which has a first planetary gear set (24) with a first sun gear (28) non-rotatably connected to the rotor (16), a first planet carrier (30) and a first ring gear (32) and a second planetary gear set (26) with a second sun gear (34), a second planet carrier (36 ) and a second ring gear (38), with at least two shifting elements (S1, S2) for shifting at least two transmission gears (1, 2), and with a differential gear (42) which has a differential input shaft (44) which is non-rotatably connected to the second planetary carrier (36) and has two output shafts (46, 48), the first sun gear (28) being non-rotatably connected to the second sun gear (34), and the first ring gear (32) being non-rotatably connected to the second ring gear (38 ) connected is.

Description

The invention relates to an electric drive device for a motor vehicle according to the preamble of patent claim 1. The invention also relates to a motor vehicle, in particular a motor vehicle.

The DE 10 2013 225 519 A1 discloses a planetary gear for a motor vehicle, with an input shaft forming a sun gear, with a planetary carrier carrying a first set of planetary gears and a second set of planetary gears, with a first ring gear associated with the first set of planetary gears, and with a second Ring gear associated with the second set of planetary gears. A first locking means is also provided, by means of which the first ring gear can be locked. Furthermore, a second locking means is provided, by means of which the second ring gear can be locked.

The object of the present invention is to create an electric drive device for a motor vehicle and a motor vehicle, so that a particularly low-loss and compact design can be implemented.

This object is achieved by an electric drive device having the features of patent claim 1 and by a motor vehicle having the features of patent claim 8 . Advantageous configurations with expedient developments of the invention are specified in the remaining claims.

A first aspect of the invention relates to an electric drive device for a motor vehicle, in particular for a motor vehicle that is preferably designed as a passenger vehicle. This means that the motor vehicle has the electric drive device in its completely manufactured state and can be driven electrically, in particular purely electrically, by means of the electric drive device. For this purpose, the electric drive device comprises at least one electric machine, by means of which the motor vehicle can be driven, in particular purely electrically. The electric machine has a rotor. For example, the electrical machine also has a stator, by means of which the rotor can be driven and thereby rotated about a machine axis of rotation relative to the stator. In particular, the electric machine can provide drive torques for driving the motor vehicle via its rotor. For example, an axle of the motor vehicle can be driven by means of the electrical machine, in particular by means of the rotor, at least or exactly two vehicle wheels, also referred to simply as wheels, as a result of which the motor vehicle can be driven.

The electric drive device also includes a planetary gear set, which has a first planetary gear set and a second planetary gear set. The first planetary gear set has a first sun gear which is, in particular permanently, non-rotatably connected to the rotor. In addition, the first planetary gear set includes a first planet carrier, also referred to as a first carrier, and a first ring gear. The first sun gear, the first planet carrier and the first ring gear are first transmission elements of the first planetary gear set. The second planetary gear set includes a second sun gear, a second planet carrier, and a second ring gear, with the second planet carrier being referred to as the second carrier. The second sun gear, the second planet carrier and the second ring gear are also referred to as the second transmission elements of the second planetary gear set. For example, the electric drive device includes a housing in which, for example, the planetary gear sets or the transmission elements can be arranged. In particular, when the respective transmission element is not connected to the housing in a rotationally fixed manner and is driven, in particular because the respective drive torque or a respective torque resulting from the respective drive torque is exerted on the respective torque, the respective transmission element is in particular about a transmission element axis of rotation rotatable relative to the housing. In particular, it is conceivable that the first transmission elements are arranged coaxially with one another. Alternatively or additionally, for example, the second transmission elements are arranged coaxially with one another.

The electric drive device also has at least two shifting elements for shifting at least two gears of the electric drive device, in particular the planetary gear. In the context of the present disclosure, a non-rotatable connection of two rotatable or rotatably mounted elements means that these two elements are arranged coaxially to one another and are connected to one another in such a way that they rotate at the same angular velocity, in particular about an element axis of rotation and/or relative to the housing rotate, especially when one of the elements and thus the other element is driven. In particular, the respective element can be the respective transmission element. The rotor is preferably arranged coaxially with the planetary gear sets, which are also referred to as planetary gear sets.

In particular, the feature that elements are permanently connected or coupled to one another in a rotationally fixed manner means that a switching element is not provided which can be switched between a coupling state that connects or couples the elements to one another in a rotationally fixed manner and a decoupling state in which the elements are decoupled from one another and are rotatable relative to each other, so that no torque can be transmitted between the elements, but the elements are always or always, therefore permanently, non-rotatably connected or coupled to one another.

The electric drive device also includes a differential gear, which is assigned, for example, to the aforementioned axle and thus, for example, to the vehicle wheels, which can be driven by the electric machine via the rotor. As is already well known, the differential gear has, for example, such a function that the differential gear allows different speeds of the vehicle wheels when the motor vehicle is cornering, such that the wheel on the outside of the curve rotates at a higher speed than the wheel on the inside of the curve, in particular while the wheels are turning can be driven or are driven by the rotor and thus by the electric machine via the differential gear.

The differential gear has a differential input shaft, via which the respective drive torque or a respective torque resulting from the drive torque can be introduced into the differential gear, as a result of which the differential gear and via this the wheels can be driven. Furthermore, the differential gear comprises two output shafts, which can be driven by the differential input shaft. In particular, the vehicle wheels can be driven by the output shafts, in particular in such a way that a first of the wheels can be driven by a first of the output shafts and the second wheel can be driven by the second output shaft. Provision is made here for the differential input shaft to be connected to the second planet carrier in a torque-proof manner, in particular permanently.

In order to be able to realize a particularly low-loss and compact design of the electric drive device, it is provided according to the invention that the first sun wheel is connected to the second sun wheel in a torque-proof manner, in particular permanently. In addition, it is provided according to the invention that the first ring gear is connected, in particular permanently, in a rotationally fixed manner to the second ring gear.

For example, when the respective first transmission element is not rotationally fixedly connected to the housing, it can rotate about a first transmission element axis of rotation relative to the housing, the first transmission element axis of rotation also being referred to as the first planetary gear set axis of rotation. It is conceivable that the respective, second transmission element is rotatable about a second transmission element axis of rotation relative to the housing, particularly when it is not connected in a rotationally fixed manner to the housing, with the second transmission element axis of rotation also being referred to as the second planetary gear set axis of rotation. Since the planetary gear sets are preferably arranged coaxially to one another, the planetary gear set rotation axes or the transmission element rotation axes coincide. When the transmission element axis of rotation is referred to below, this is to be understood as meaning the transmission element axis of rotation and the planetary gear set axis of rotation, unless otherwise stated.

In order to be able to achieve a particularly advantageous drivability in a compact and low-loss manner, one embodiment of the invention provides that the first switching element is designed to connect the first planet carrier to the housing of the electric drive device in a rotationally fixed manner. This means in particular that the first switching element can be switched over between a first coupling state and a first decoupling state. In the first coupling state, the first planet carrier is connected to the housing in a rotationally fixed manner by means of the first switching element, and is therefore fixed in a rotationally fixed manner to the housing. Thus, in particular, the first planetary carrier cannot rotate about the transmission element axis of rotation relative to the housing when the first planetary carrier is being driven. In the first decoupling state, the first shifting element releases the first planetary carrier for rotation relative to the housing about the transmission element axis of rotation, so that the first planetary carrier can be rotated or is rotated relative to the housing about the transmission element axis of rotation when the first planetary carrier is being driven.

A further embodiment is characterized in that the second switching element is designed to connect the second ring gear to a housing in a rotationally fixed manner. For example, the second switching element can be switched over between a second coupling state and a second decoupling state. In the second coupling state, the second ring gear is non-rotatably connected to the housing by means of the second switching element, so that the second ring gear in particular cannot rotate about the transmission element axis of rotation relative to the housing when the second ring gear is being driven. In the second decoupling state, the second switching element releases the second ring gear for rotation relative to the housing about the axis of rotation of the transmission element, so that the second ring gear can be rotated or rotated relative to the housing about the axis of rotation of the transmission element when the second ring gear is being driven.

For example, the first switching element can be moved, in particular relative to the housing and/or translationally, between at least one first coupling position causing the first coupling state and at least one first uncoupling position causing the first uncoupling state. It is also conceivable that the second switching element can be moved, in particular translationally and/or relative to the housing, between at least one second coupling state causing the first coupling state and at least one second uncoupling position causing the second uncoupling state.

In order to be able to realize a particularly advantageous drivability of the motor vehicle in a particularly low-loss and space-saving manner, it is provided in a further embodiment of the invention that the electric drive device has a parking lock wheel which is non-rotatably connected, in particular permanently, to the second planet carrier. The parking lock wheel is part of a parking lock, for example, which can be activated and deactivated. If the parking lock is activated, the parking lock gear and, via this, the second planet carrier are prevented from rotating relative to the housing about the axis of rotation of the transmission element, which means that, for example, an undesired rolling away of the motor vehicle can be avoided or is avoided, especially when the motor vehicle is on a slope is turned off. If the parking lock is deactivated, the parking lock wheel and thus the second planet carrier can rotate, so that the motor vehicle can roll down a slope, for example.

It has proven to be particularly advantageous if the first switching element has a freewheel. This makes it possible, for example, for one of the transmission elements, in particular the first planetary carrier, to be non-rotatably connected to the housing by means of the first shifting element in a first direction of rotation running around the transmission element's axis of rotation, with the freewheel relative rotations between the transmission element, in particular the first planetary carrier, and the housing in a second direction of rotation running around the axis of rotation of the transmission element and opposite to the first direction of rotation. In this way, particularly advantageous operation can be implemented in a manner that is particularly favorable in terms of weight, cost and installation space.

In order to be able to keep losses particularly low, it is provided in a further embodiment of the invention that the first shifting element has a dog clutch. By means of the claw coupling, at least one of the transmission elements, such as the first planetary carrier, can be connected in a form-fitting manner and thus in a rotationally fixed manner with a particularly low loss to another of the transmission elements or to the housing.

In particular, it is conceivable that at least one of the shifting elements such as the first shifting element is designed as a positive shifting element such as a dog clutch or has a positive shifting element such as a dog clutch. It is also conceivable that at least one of the shifting elements, such as the second shifting element, is designed as a non-positive or frictional shifting element or has such a non-positive or frictional shifting element, by means of which, for example, one of the transmission elements is force-connected to another of the transmission elements or to the housing - Or frictionally torque-transmitting, in particular non-rotatably, can be connected. The frictional shifting element is also referred to as a frictional clutch and can be designed, for example, as a multi-plate clutch. The form-locking shifting element is also referred to as a form-locking clutch and can be designed, for example, as a claw clutch. The positive-locking shifting element is designed in particular to connect two of the transmission elements or one of the transmission elements and the housing to one another in a rotationally fixed manner by at least one form-locking connection, which is formed, for example, by at least two solid bodies mutually rotating in at least one or both directions of rotation running around the axis of rotation of the transmission element overlap. In contrast, the frictional shifting element can connect two of the transmission elements or one of the transmission elements and the housing, in particular exclusively, in a rotationally fixed manner by friction or frictional forces, for example by connecting at least two friction partners to one another in a torque-transmitting manner, for example without the friction partners overlapping one another about the transmission element axis of rotation.

In order to be able to present a particularly advantageous drivability of the motor vehicle in a particularly space-saving manner, it is provided in a further embodiment of the invention that the electric drive device has a third shift, also referred to as a blocking shift element has element for blocking the planetary gear. In other words, the planetary gear can be locked by locking the shifting element. For this purpose, the first sun gear can be connected to the first planet carrier in a rotationally fixed manner, for example by means of the blocking shift element. Generally speaking, by means of the blocking shifting element, two of the transmission elements that are not already. In particular, are permanently, non-rotatably coupled to one another, are non-rotatably connected to one another, as a result of which the, in particular entire, planetary gear is blocked, in particular because at least two of the gear elements in the planetary gear are already non-rotatably connected to one another, in particular in the form of the first sun gear and the second Sun gear or the first ring gear and the second ring gear.

A second aspect of the invention relates to a motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, which has at least or exactly one electric drive device according to the invention and can be driven, in particular purely electrically, by means of the drive device. Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa.

• - geringe Relativdrehzahlen in den offen laufenden Schaltelementen
• - Die Schaltelemente können sehr gut zugänglich sein, insbesondere dann, wenn zumindest eines der Schaltelemente, zumindest zwei der Schaltelemente oder die drei Schaltelemente als halbschlüssige Schaltelemente wie beispielsweise Bremsen ausgebildet sind.
• - guter Verzahnungswirkungsgrad, insbesondere im zweiten Getriebegang
• - Die Drehzahlen der elektrischen Maschine, das heißt des Rotors können bei hoher Geschwindigkeit besonders gering gehalten werden, insbesondere durch eine Mehrgängigkeit des Planetengetriebes, wobei die Mehrgängigkeit durch die wenigstens zwei Getriebegänge realisiert ist

In particular, the following advantages can be realized by the invention:

• - low relative speeds in the open-running switching elements
• - The switching elements can be easily accessible, especially when at least one of the switching elements, at least two of the switching elements or the three switching elements are designed as semi-closed switching elements such as brakes.
• - Good gearing efficiency, especially in the second gear
• - The speeds of the electrical machine, ie the rotor can be kept particularly low at high speed, in particular by a multiple gear of the planetary gear, the multiple gear is realized by the at least two gears

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing. The features and combinations of features mentioned above in the description and 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 combination specified in each case, but also in other combinations or on their own, without going beyond the scope of the leave invention.

• 1 eine schematische Darstellung einer ersten Ausführungsform einer elektrischen Antriebsvorrichtung;
• 2 eine schematische Darstellung einer zweiten Ausführungsform der Antriebsvorrichtung; und
• 3 eine Schalttabelle zur Veranschaulichung von schaltbaren, das heißt einlegbaren und auslegbaren Gängen.

The drawing shows in:

• 1 a schematic representation of a first embodiment of an electric drive device;
• 2 a schematic representation of a second embodiment of the drive device; and
• 3 a shift table to illustrate shiftable, i.e. insertable and disengageable, gears.

Elements that are the same or have the same function are provided with the same reference symbols in the figures.

1 shows a first embodiment of an electric drive device 10 for a motor vehicle in a schematic representation. The motor vehicle designed in particular as a motor vehicle and very particularly as a passenger car preferably has at least or exactly two axles arranged one behind the other in the longitudinal direction of the vehicle, which are also referred to as vehicle axles. The respective axle has at least or exactly two wheels, also referred to as vehicle wheels, which are ground contact elements of the motor vehicle. The respective wheels of the respective axle are arranged on opposite sides of the motor vehicle in the vehicle transverse direction. The motor vehicle can be supported or is supported downwards on a roadway in the vertical direction of the vehicle via the wheels designed as ground contact elements of the motor vehicle. If the motor vehicle is driven electrically, in particular purely electrically, by means of the drive device 10, while the motor vehicle is supported on the roadway downwards in the vertical direction of the vehicle, the wheels roll off the roadway. For example, in relation to the axles, the drive device 10 is assigned exclusively and therefore precisely to one of the axles, so that, for example, in relation to the wheels, only the wheels of the axle can be driven by means of the drive device 10 to which the drive device 10 is assigned.

The drive device 10 has an electric machine 12 which has a stator 14 and a rotor 16 . The rotor 16 can be driven by the stator 14 and can therefore be rotated about a machine axis of rotation 18 relative to the stator 14 . About the rotor 16, the electric machine 12 drive torques for driving provide the wheels of the axle, which is associated with the electric machine 12. The wheels that can be driven by the electric machine 12 via its rotor 16 are also referred to as drive wheels. The drive device 10 also has a 1 housing 20 shown particularly schematically, the rotor 16 being rotatable about the machine axis of rotation 18 relative to the housing 20 .

The drive device 10 has a planetary gear 22 which includes a first planetary gear set 24 and a second planetary gear set 26 . The planetary gear sets 24 and 26 are preferably each arranged at least partially, in particular at least predominantly and thus at least more than half or completely, in the housing 20 . At the in 1 shown first embodiment, the planetary gear sets 24 and 26 are arranged coaxially to each other. In addition, the rotor 16 is arranged coaxially with the planetary gear sets 24 and 26 . The planetary gear set 24 has a first sun gear 28, a first planet carrier 30 and a first ring gear 32, the sun gear 28, the planet carrier 30 and the ring gear 32 also being referred to as first transmission elements. In particular, when the respective, first transmission element is not connected to the housing 20 in a rotationally fixed manner, the respective, first transmission element can be rotated about a first transmission element axis of rotation relative to the housing 20 .

The second planetary gear set 26 has a second sun gear 34 , a second planet carrier 36 and a second ring gear 38 . The sun gear 34, the planet carrier 36 and the ring gear 38 are also referred to as the second transmission elements of the second planetary gear set 26. In particular, when the respective, second transmission element is not connected to the housing 20 in a rotationally fixed manner, the respective, second transmission element can be rotated about a second transmission element axis of rotation relative to the housing 20 . In the first embodiment, since the planetary gear sets 24, 26 are coaxial with one another, the transmission element axes of rotation coincide, and since the rotor 16 is coaxial with the planetary gear sets 24, 26, the transmission element axes of rotation coincide with the engine axis of rotation 18.

The planetary gear set 24 also has at least one or more first planetary gears 39 . The respective first planetary gear 39 is rotatably mounted on the planet carrier 30 and meshes, for example, directly with the sun gear 28 and the ring gear 32. The planetary gear set 26 has at least one or more second planetary gears 40, with the respective second planetary gear 40 rotatably on the planet carrier 36 is mounted. The respective planet gear 40 meshes directly and simultaneously with the sun gear 34 and the ring gear 38.

The drive device 10, in particular the planetary gear 22, has a first shifting element S1 and a second shifting element S2, with the shifting elements S1 and S2 being designed to shift at least or exactly two gears of the drive device 10, in particular the planetary gear 22. This means that the two gears can be engaged and disengaged by means of the shifting elements S1 and S2. In particular, the gears differ from one another in terms of their respective translations, in particular such that a first of the gears has a first translation and the second gear has a second translation. In particular, the second translation is lower than the first translation.

The drive device 10 also has a differential gear 42, which can be designed, for example, as a bevel gear differential. The differential gear has a differential input shaft 44 via which the respective drive torque or a respective torque resulting from the respective drive torque can be introduced into the differential gear 42 . As a result, the differential input shaft, also referred to simply as the input shaft, and thus the differential gear 42 are driven. Furthermore, the differential gear 42 includes two output shafts 46 and 48, which can be driven by the input shaft. As a result, the output shafts 46 and 48 can have a respective, in 1 provide torque illustrated by arrows 50 by means of which the wheels of the axle to which the drive device 10 is assigned can be driven. For example, the differential gear 42 comprises differential gears 52 which mesh with output gears 54 of the differential gear 42 . In this case, the output wheels 54 are toothed wheels which are connected to the output shafts 46 in a torque-proof manner, in particular permanently. The differential gears 52 are also gears. Out of 1 it can be seen that the rotor 16 is arranged axially parallel to the output shafts 50 arranged coaxially to one another. This means in particular that the output shafts 50 are rotatable about a common output shaft axis of rotation relative to the housing 20, the machine axis of rotation 18 and the output shaft axis of rotation running parallel to one another and being spaced apart from one another. Furthermore, it is off 1 recognizable that the first sun wheel 28, in particular permanently, is non-rotatably connected to the rotor 16. In addition, the second planet carrier 36 is, in particular permanently, non-rotatably connected to the differential input shaft.

In order to be able to realize a particularly low-loss and compact design of the drive device 10, the first sun gear 28 is also connected to the second sun gear 34 in a torque-proof manner, in particular permanently. Provision is also made for the first ring gear 32 to be connected to the second ring gear 38 in a torque-proof manner, in particular permanently.

The first planetary carrier 30 can be connected to the housing 20 in a torque-proof manner by means of the first switching element S1. The second ring gear 38 and thus the first ring gear 32 can be connected to the housing 20 in a torque-proof manner by means of the second switching element S2. Furthermore, a parking lock gear 56 of a parking lock 58 is provided, the parking lock gear 56 being connected, in particular permanently, in a torque-proof manner to the second planet carrier 36 and thus to the differential input shaft 44 . As a result, the second planet carrier 36 and the differential input shaft 44 and, via the latter, the output shafts 46 and 48 and thus the drive wheels when the parking lock 58 is activated, whereby the parking lock wheel 56 is non-rotatably connected to the housing 20, in particular in a form-fitting manner, against a relative to the Housing 20 prevented rotation taking place, whereby the motor vehicle is particularly secured against unwanted rolling away when the motor vehicle is parked on a slope and in particular.

In the first embodiment, shifting element S1 is or comprises a positive-locking shifting element, by means of which planetary carrier 30 can be connected to housing 20 in at least one first direction of rotation running around the axis of rotation of the transmission element or machine axis of rotation 18 and/or in a positive-locking manner. It is conceivable that by means of the shifting element S1 or by means of the positive-locking shifting element, the planetary carrier 30 can also be positively non-rotatably connected to the housing 20 in a second direction of rotation running around the axis of rotation of the machine and opposite to the first direction of rotation. For example, the shifting element S1 has a claw clutch K as the form-locking shifting element, by means of which the planetary carrier 30 can be connected to the housing 20 in a form-locking, non-rotatable manner in the first direction of rotation. In the first embodiment, the shifting element S1 also has a freewheel F, which allows, for example, a rotation of the planetary carrier 30 in the second direction of rotation about the machine rotational axis 18 relative to the housing 20, in particular while the planetary carrier 30 is being operated by means of the shifting element S1, in particular by means of the Claw clutch K, in the first direction of rotation, in particular positively, non-rotatably connected to the housing 20. Thus, for example, the shifting element S1, in particular the dog clutch K, prevents rotations of the planet carrier 30 in the first direction of rotation about the machine axis of rotation 18 relative to the housing 20, in particular in a form-fitting manner, and the shifting element S1, in particular the freewheel F, allows about the machine axis of rotation 18 in the second direction of rotation occurring relative rotation and between the planet carrier 30 and the housing 20 to. In this case, the freewheel F is preferably also form-fitting. The claw clutch K is just one example of a form-fitting clutch or of a form-fitting shifting element, so that other form-fitting shifting elements can also be used.

The second shifting element S2 can, in particular also, be or have a positive-locking shifting element, so that by means of the shifting element S2, for example, the ring gear 38 can be positively connected in a torque-proof manner to the housing 20 . It makes sense, however, for the second shifting element S2 to be a friction-locking shifting element, since then, at least to a large extent, power shifting can be achieved, in particular with a certain reduction in traction, but without an interruption in traction, in particular when changing or shifting from first gear to second gear and from second gear to the first course.

In particular with regard to a kinematic equivalence, which is to be regarded as included or disclosed here, it can be provided that in a planetary gear set, such as the respective planetary gear set 24 or 26, a single planetary carrier, such as the respective planetary carrier 30 or 36, can be replaced by a double planetary carrier , In particular if the respective connections of the other two transmission elements of this planetary gear set are exchanged at the same time. In a planetary gear set, a shifting element designed in particular as a brake shifting element for the fixed connection to the housing, i.e. for the non-rotatable connection of one of the transmission elements to the housing 20, can be replaced, for example, by a permanent fixed connection to the housing, especially if at the same time a fixed connection of the other two transmission elements of this planetary gear set is replaced by a shifting element , by means of which the other two transmission elements are non-rotatably connected to the housing 20.

For example, the freewheel F can be omitted, so that the shifting element S1 is free from a freewheel, with the shifting element S1 being able to be a positive shifting element or a frictional shifting element. It is also conceivable that the switching element S1 only has the freewheel F and is therefore free of one or the claws clutch K is. In contrast, however, with the in 1 shown embodiment, the dog clutch K and the freewheel F combined.

For example, in order to activate the first gear, that is to say to engage it, in particular while the second gear is deactivated, that is to say disengaged, the first shifting element S1 is closed while the second shifting element S2 is open. The planetary carrier 30 is thus non-rotatably connected to the housing 20 by means of the shifting element S1, while the shifting element S2 allows relative rotations between the ring gear 38 and the housing 20 about the machine axis of rotation. For example, in order to engage the second transmission gear while the first transmission gear is disengaged, the second shifting element S2 is closed while the first shifting element S1 is open, so that the ring gears 32 and 38 are non-rotatably connected to the housing 20 by means of the shifting element S2, while the shifting element S1 and the machine axis of rotation 18 taking place relative rotations between the planet carrier 30 and the housing 20 allows. The switching element S2 is at the in 1 shown, first embodiment, for example, a frictional shifting element, but could alternatively be as a positive shifting element such as a claw clutch.

2 12 shows a second embodiment of the drive device 10. In the second embodiment, the drive device 10 has a third shift element S3 which is provided in addition to the shift elements S1 and S2 and is also referred to as a blocking shift element or K1. While the first embodiment has only the two shiftable gears, the second embodiment has at least or exactly three shiftable gears and thus the first gear, the second gear and a third gear whose third gear ratio is, for example, lower than the second gear ratio of the second gear gear. The third shifting element S3 is a blocking shifting element, by means of which the planetary gear 22 is to be blocked. In the second embodiment, the planetary carrier 30 and the sun gear 28 and thus the sun gear 34 can be connected to one another in a torque-proof manner by means of the switching element S3. If the switching element S3 is closed, so that the planetary carrier 30 is non-rotatably connected to the sun gear 28 and thus non-rotatably to the sun gear 34, the two planetary gear sets 24 and 26, for example, rotate as a block when they are driven. If the switching element S3 is open, then the switching element S3 allows relative rotations between the planetary carrier 30 and the sun gear 28 or 34 about the machine axis of rotation 18 .

3 shows a shift table in which the gears designated 1, 2 and 3 and the shift elements S1, S2 and S3 are entered. The first gear is denoted by 1, the second gear by 2 and the third gear by 3. From the shift table it can be seen that to engage the first gear 1, the shifting element S1 is closed while the shifting elements S2 and S3 are open, so that while the first gear 1 is engaged, the gears 2 and 3 are disengaged. In order to engage the second transmission gear 2 while the transmission gears 1 and 3 are disengaged, the shifting element S2 is closed while the shifting elements S1 and S3 are opened. In order to engage third gear 3 while gears 1 and 2 are disengaged, shifting element S3 is closed while shifting elements S1 and S2 are open.

A big advantage of the in 1 The first embodiment shown, in which the shifting element S1 has both the dog clutch K1 and the freewheel F, is that the costs can be kept particularly low since a shifting element to be actuated hydraulically-electromechanically can be dispensed with.

reference list

10

drive device

12

electric machine

14

stator

16

rotor

18

machine axis of rotation

20

Housing

22

planetary gear

24

first planetary gear set

26

second planetary gear set

28

first ring gear

30

first planet carrier

32

first ring gear

34

second sun wheel

36

second planet carrier

38

second ring gear

39

planet wheel

40

planet wheel

42

differential gear

44

differential input shaft

46

output shaft

48

output shaft

50

Arrow

52

balance wheel

54

output gear

56

parking lock wheel

58

parking lock

f

freewheel

K

claw clutch

S1

first switching element

S2

second switching element

S3

third switching element

QUOTES INCLUDED IN DESCRIPTION

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

Patent Literature Cited

• DE 102013225519 A1 [0002]

Claims (8)

Electrical drive device (10) for a motor vehicle, with: - an electric machine (12) designed to drive the motor vehicle, which has a rotor (14), - a planetary gear (22) which has a first planetary gear set (24) with a the rotor (16) non-rotatably connected first sun gear (28), a first planet carrier (30) and a first ring gear (32) and a second planetary gear set (26) with a second sun gear (34), a second planet carrier (36) and a second ring gear (38), - at least two shifting elements (S1, S2), namely a first shifting element (S1) and a second shifting element (S2), for shifting at least two gears (1, 2), - a differential gear (42) , which has a differential input shaft (44), which is non-rotatably connected to the second planet carrier (36), and two output shafts (46, 48), characterized in that: - the first sun wheel (28) is non-rotatably connected to the second sun wheel (34) is connected, and - the first ring gear (32) is non-rotatably connected to the second ring gear (38). Electrical drive device (10) after claim 1 , characterized in that the first switching element (S1) is designed to the first planet carrier (30) rotatably connected to a housing (20) of the electric drive device (10). Electrical drive device (10) after claim 1 or 2 , characterized in that the second switching element (S2) is designed to the second ring gear (38) rotatably connected to a housing (20) of the electric drive device (10). Electrical drive device (10) according to one of the preceding claims, characterized by a parking lock wheel (56) which is non-rotatably connected to the second planet carrier (36). Electrical drive device (10) according to one of the preceding claims, characterized in that the first switching element (S1) has a freewheel (F). Electrical drive device (10) after claim 5 , characterized in that the first switching element (S1) has a claw clutch (K). Electrical drive device (10) according to one of the preceding claims, characterized by a third switching element (S3) for blocking the planetary gear (22). Motor vehicle with at least one electric drive device (10) according to one of the preceding claims.

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