Motor vehicle transmission for at least partially electrically driven motor vehicle

Abstract

The invention relates to a motor vehicle transmission (2) for an at least partially electrically driven motor vehicle, comprising a first drive shaft (9), a second drive shaft (10), an output shaft (11) and a first planetary gear set (P1), a second planetary gear set (P2) and a third planetary gear set (P3), the drive shafts (9, 10) being each provided for coupling to a respective drive machine. In addition, at least four switching elements in the form of a first switching element (B), a second switching element (C), a third switching element (E) and a fourth switching element (F) are provided functionally. The invention further relates to a drive unit (1), a drive axle of a motor vehicle, a hybrid vehicle or an electric vehicle, and a method for operating a transmission of a motor vehicle.

Description

Technical Field

[0001] The invention relates to a motor vehicle transmission for an at least partially electrically driven motor vehicle, the motor vehicle transmission comprising a first drive shaft, a second drive shaft, an output shaft and a first planetary gear set and a second planetary gear set, wherein the first drive shaft is arranged to be coupled to a first drive machine, in particular a first electric machine, and the second drive shaft is arranged to be coupled to a second drive machine, in particular a second electric machine, wherein the first planetary gear set and the second planetary gear set respectively have a first element, a second element and a third element in the form of a sun gear, a planet carrier and a ring gear, wherein at least a first shift element, a second shift element, a third shift element and a fourth shift element are provided in terms of function, wherein the first planetary gear set The first element is connected to the first drive shaft in a rotationally fixed manner, and the second element of the first planetary gear set is connected to the first element of the second planetary gear set in a rotationally fixed manner, wherein the third element of the second planetary gear set is stationary, wherein the second element of the second planetary gear set is connected to the output shaft in a rotationally fixed manner, wherein at least the first functionally provided switching element is configured to connect the third element of the first planetary gear set to the output shaft in a rotationally fixed manner in an actuated state, and wherein at least the second functionally provided switching element is configured to connect two of the elements of the first planetary gear set to each other in a rotationally fixed manner in an actuated state. The invention also relates to a drive unit for an at least partially electrically driven motor vehicle, a motor vehicle drive axle for a hybrid vehicle or electric vehicle, a hybrid vehicle or electric vehicle, and a method for operating a motor vehicle transmission. Background Art

[0002] In motor vehicles designed as electric vehicles and hybrid vehicles, a motor vehicle transmission is sometimes provided in the respective drive train between at least one electric machine of the respective motor vehicle and the drive wheels in order to be able to transmit the drive movement of the at least one electric machine to the drive wheels, in particular in a reduced speed. In addition to transmissions designed as a single gear, motor vehicle transmissions are also used in some cases in which two or more gears can be switched.

[0003] DE 10 2019 216 562 A1 shows a motor vehicle drive axle of an electric vehicle, wherein a drive unit having a motor vehicle transmission and two motors is provided in the motor vehicle drive axle. The rotors of the two motors are respectively connected to a drive shaft belonging to the motor vehicle transmission in a rotationally fixed manner. In addition, the motor vehicle transmission also has two planetary gear sets, which are respectively formed by a sun gear, a planet carrier and a ring gear. In addition, in terms of function, five switching elements are also formed in the motor vehicle transmission, of which three switching elements are configured to switch out a gear position between the first drive shaft and the output shaft of the motor vehicle transmission respectively by selectively operating, and thus respectively connect the first motor connected to the first drive shaft. Via one of the remaining two switching elements, a rotationally fixed connection between the two drive shafts can be created so that the gears respectively switched between the first drive shaft and the output shaft can also be used for the electric motor connected to the second drive shaft, while via the other remaining switching element the connection of the second electric motor can be represented for traction support during the shifting process between the gears. Summary of the invention

[0004] Based on the above-mentioned prior art, the object of the present invention is now to provide a motor vehicle transmission for engaging two drive machines, wherein the motor vehicle transmission should be able to enable the drive machines to be engaged independently of one another.

[0005] This object is achieved on the basis of the preamble of claim 1 in combination with its distinguishing features. The subsequent dependent claims each represent advantageous developments of the invention. Furthermore, a drive unit in which a motor vehicle transmission according to the invention is arranged is the subject of claims 15 to 17. Furthermore, claim 18 relates to a motor vehicle drive axle for a hybrid vehicle or electric vehicle, while claim 19 has the subject of a hybrid vehicle or electric vehicle. Finally, claims 20 to 23 each also relate to a method for operating a motor vehicle transmission according to the invention.

[0006] According to the present invention, the motor vehicle transmission comprises a first drive shaft, a second drive shaft, an output shaft, and a first planetary gear set and a second planetary gear set. Here, the first drive shaft is configured to be coupled to a first drive machine, in particular a first motor, and the second drive shaft is configured to be coupled to a second drive machine, in particular a second motor. The first planetary gear set and the second planetary gear set respectively have a first element, a second element, and a third element in the form of a sun gear, a planet carrier, and a ring gear. In addition, at least a first switching element, a second switching element, a third switching element, and a fourth switching element are provided functionally. The first element of the first planetary gear set is connected to the first drive shaft in a manner that is resistant to relative rotation, and the second element of the first planetary gear set is connected to the first element of the second planetary gear set in a manner that is resistant to relative rotation. In addition, the third element of the second planetary gear set is stationary, and the second element of the second planetary gear set is connected to the output shaft in a manner that is resistant to relative rotation.

[0007] At least the first functionally provided shifting element is designed to connect the third element of the first planetary gear set to the output shaft in a rotationally fixed manner when the shifting element is actuated. In addition, at least the second functionally provided shifting element is designed to connect two of the elements of the first planetary gear set to each other in a rotationally fixed manner when the shifting element is actuated.

[0008] In the sense of the present invention, an "axis", such as a respective drive shaft or output shaft, refers to a rotatable component of a transmission, via which a power flow can be directed between components, if necessary, while simultaneously actuating at least a functionally provided switching element. The respective axes can be connected to each other axially or radially, or both axially and radially. Therefore, the respective axes can also exist as intermediate pieces, via which, for example, the respective components are connected only radially. In addition, the respective axes can also be designed as solid shafts, hollow shafts, or partially as solid shafts and partially as hollow shafts, depending on the direction of the components and the connection method or the connectability thereto. As an alternative or in addition to this, the respective axes can be implemented in one piece or in multiple pieces.

[0009] In the sense of the invention, "axially" refers to an orientation in the direction of the longitudinal center axis of the motor vehicle transmission, which is also oriented parallel to the axes of rotation of the shafts of the motor vehicle transmission and of the elements of the planetary gear set. "Radially" then refers to an orientation in the direction of the diameter of the respective component of the transmission, in particular the respective shaft or the respective component of the planetary gear set.

[0010] The motor vehicle transmission according to the present invention has a first drive shaft and a second drive shaft, wherein the two drive shafts are particularly coaxial with each other. In addition, in the motor vehicle transmission according to the present invention, the first drive shaft and the second drive shaft are arranged to establish a coupling with the drive side of each drive machine, wherein the respective drive shafts are preferably respectively used to couple with exactly one drive machine. For this purpose, the respective drive shafts are particularly equipped with a respective connection part, at which the coupling of the respective drive shaft with the corresponding drive machine can be formed. The connection of the corresponding drive machine with each connection part of the respective drive shaft is particularly permanently implemented in the installed state of the motor vehicle transmission, preferably when the corresponding drive machine is implemented as an electric machine. However, alternatively, a starting element located in the middle can also be provided, such as a hydraulic torque converter, a starting clutch, etc., through which the respective drive shaft can be coupled or coupled with the upstream corresponding drive machine at each connection part. This is particularly achieved when the corresponding drive machine is designed as an internal combustion engine.

[0011] The coupling between the associated drive machine and the respective drive shaft is preferably such that, in the installed state of the motor vehicle transmission and when the coupling is established, a fixed speed ratio is always maintained between the rotational speed of the respective drive shaft of the motor vehicle transmission and the rotational speed of the associated drive machine. Therefore, within the scope of the invention, at least one further transmission ratio stage, such as a spur gear stage and / or a planetary stage, can be provided between the respective drive shaft and the associated drive machine, via which further transmission ratio stage a pre-transmission of the rotational movement of the associated drive machine to the respective drive shaft can be achieved. However, preferably, the respective drive shaft is used for a rotationally fixed connection to the associated drive machine.

[0012] The motor vehicle transmission is in particular a hybrid vehicle transmission or an electric vehicle transmission which is provided for connecting a drive machine in the form of an electric motor to a respective drive shaft. Here, as described above, the respective rotor of the respective electric motor can be coupled to the respective drive shaft of the motor vehicle transmission via at least one intermediate transmission ratio step. However, it is particularly preferred that the respective rotor of the respective electric motor is connected to the associated drive shaft in a rotationally fixed manner in the installed state of the motor vehicle transmission according to the invention.

[0013] In the motor vehicle transmission according to the invention, the output shaft is particularly arranged to establish a coupling on the output side of the motor vehicle transmission with a component following behind the motor vehicle transmission in the direction of the power flow to the drive wheels of the respective motor vehicles in the installed state of the motor vehicle transmission. Therefore, the motor vehicle transmission according to the invention is particularly a travel transmission, via which the drive engine can be connected with different transmission ratios and can be coupled with the drive wheels of the respective motor vehicles. Here, on the output shaft of the motor vehicle transmission according to the invention, a coupling with a differential gear set can be established in particular, which is coaxial with the output shaft or offset on the axis and can function as a transverse differential or longitudinal differential. The coupling can be established here via a transmission ratio stage in the form of a bevel gear transmission. Alternatively, the output shaft can also be connected to the downstream differential gear set in a rotationally fixed manner, or coupled via a transmission ratio stage located in the middle, for example in the form of an additional planetary gear set.

[0014] The present invention now includes the following technical teaching, that is, a third planetary gear set is also provided, the third planetary gear set has a first element, a second element and a third element in the form of a sun gear, a planet carrier and a ring gear, and the second element of the third planetary gear set is connected to the second element of the first planetary gear set and the first element of the second planetary gear set in a rotationally fixed manner. In addition, the first element of the third planetary gear set is connected to the second drive shaft in a rotationally fixed manner. At least the third switching element provided in function is set up to connect the third element of the third planetary gear set to the output shaft in a rotationally fixed manner in the actuated state, and at least the fourth switching element provided in function is set up to connect two elements of the elements of the third planetary gear set to each other in a rotationally fixed manner in the actuated state.

[0015] Therefore, in the motor vehicle transmission according to the invention, in addition to the first planetary gear set and the second planetary gear set, a third planetary gear set is additionally provided. Particularly preferably, the motor vehicle transmission according to the invention has exactly three planetary gear sets in the form of a first planetary gear set, a second planetary gear set and a third planetary gear set.

[0016] At present, the first element of the first planetary gear set is permanently connected to the first drive shaft in a rotationally fixed manner, thereby causing the first drive shaft to rotate continuously with the first element of the first planetary gear set. In addition, the second element of the first planetary gear set, the first element of the second planetary gear set, and the second element of the third planetary gear set are permanently connected to each other in a rotationally fixed manner, which means that the second element of the first planetary gear set, the first element of the second planetary gear set, and the second element of the third planetary gear set always rotate together. There is also a permanent rotationally fixed connection between the output shaft and the second element of the second planetary gear set, thereby causing the output shaft to rotate continuously with the second element of the second planetary gear set. In addition, the third element of the second planetary gear set is permanently fixed, thereby causing the third element of the second planetary gear set to be continuously prevented from rotating. The first element of the third planetary gear set is permanently connected to the second drive shaft in a rotationally fixed manner, thereby causing the first element of the third planetary gear set to rotate continuously with the second drive shaft.

[0017] The actuated state of at least the first functionally provided shifting element results in a rotationally fixed connection between the third element of the first planetary gear set and the output shaft, so that the output shaft and thus the second element of the second planetary gear set also rotate together with the third element of the first planetary gear set. If, however, the actuated state of at least the second functionally provided shifting element is present, the two elements of the first planetary gear set are connected to one another in a rotationally fixed manner, which results in the interlocking of the first planetary gear set and thus the overall rotation of the first planetary gear set. In the actuated state of at least the third functionally provided shifting element, a rotationally fixed connection is established between the output shaft and the third element of the third planetary gear set, thereby causing the output shaft and the third element of the third planetary gear set to rotate together. Finally, in the case of the actuated state of at least the fourth functionally provided shifting element, the two elements of the third planetary gear set are still connected to one another in a rotationally fixed manner, thus causing the overall rotation of the third planetary gear set.

[0018] Such a design of a motor vehicle transmission has the advantage that a structure of a motor vehicle transmission is achieved in which different gears can be switched between one of the drive shafts and the output shaft independently of the other drive shafts, so that the drive engines connected to the drive shafts can also be connected independently of each other. Thus, on the one hand, when a gear change is carried out with respect to the other drive shaft and thus the drive engine connected to the other drive shaft, traction can be supported on one of the drive shafts and thus via the drive engine connected to the one of the drive shafts. On the other hand, the drive shafts can also be decoupled from the output shaft independently of each other in order to respectively represent the disengagement of the drive engines connected to the output shaft. This can be achieved with the three planetary gear sets in a compact structure and with a suitable transmission ratio.

[0019] Within the scope of the invention, the motor vehicle transmission according to the invention can be operated in such a way that a first transmission ratio is switched between the first drive shaft and the output shaft by displaying the actuated state of the first shift element. In addition, a second transmission ratio can also be switched between the first drive shaft and the output shaft by displaying the actuated state of the second shift element. In both cases, the first drive engine connected to the first drive shaft is then connected.

[0020] The second drive engine connected to the second drive shaft can be connected with the first transmission ratio by switching the first transmission ratio between the second drive shaft and the output shaft. To this end, the manipulated state of the third switching element is displayed. In addition, the second transmission ratio can also be displayed between the second drive shaft and the output shaft by displaying the manipulated state of the fourth switching element. Here, the power flow from the second drive shaft to the output shaft is realized, thereby connecting the second drive engine connected to the second drive shaft.

[0021] Therefore, what can be achieved by the vehicle transmission according to the present invention is that the first drive engine is either engaged by operating the first switching element or by operating the second switching element, while the second drive engine is disengaged when the third or fourth switching element is not operated. However, conversely, the second drive engine can also be coupled to the output shaft in the following way, that is, either the operated state of the third switching element or the operated state of the fourth switching element is achieved. If neither the first switching element nor the second switching element is operated during this engagement process, the first drive engine is disengaged. In this way, the independent engagement of the two drive units can be achieved via the motor vehicle transmission according to the present invention.

[0022] However, this independence of engagement can also result in a support of the traction force via one of the drive engines, while a gear ratio change is performed in the vehicle transmission for the other drive engine. To this end, during the change of the gear ratio acting between one of the drive shafts and the output shaft to the gear ratio acting between the other drive shaft and the output shaft, the support of the traction force at the other drive engine is achieved by switching out the gear ratio acting between the other drive shaft and the output shaft at least during the change.

[0023] The first planetary gear set, the second planetary gear set and the third planetary gear set are respectively composed of one first element, one second element and one third element, wherein the elements of the first, second and third planetary gear sets are respectively formed by a sun gear, a planet carrier and a ring gear. Particularly preferably, the first planetary gear set, the second planetary gear set and the third planetary gear set are present as negative planetary gear sets, wherein the respective planet carrier guides at least one planetary gear in a rotatable manner, wherein at least one planetary gear is in tooth meshing with the respective sun gear and the respective ring gear. When the first planetary gear set, the second planetary gear set or the third planetary gear set is implemented as a negative planetary gear set, the first element of the first, second or third planetary gear set is respectively a sun gear, the second element of the first, second or third planetary gear set is respectively a planet carrier, and the third element of the first, second or third planetary gear set is respectively a ring gear.

[0024] However, alternatively to this, the first planetary gear set and / or the second planetary gear set and / or the third planetary gear set may also be constructed as a positive planetary gear set in principle. In this case, at least one planetary gear pair is supported in a rotatable manner in the respective planetary carriers, one planetary gear in the planetary gear pair is in tooth meshing with the respective sun gear, and one planetary gear is in tooth meshing with the respective ring gear. In addition, the planetary gears in at least one planetary gear pair mesh with each other. Different from being implemented as a negative planetary gear set, the first element of the first, second or third planetary gear set is preferably a sun gear, the second element of the first, second or third planetary gear set is a ring gear, and the third element of the first, second or third planetary gear set is a planetary carrier. Compared with being implemented as a negative planetary gear set, the fixed shaft transmission ratio of each planetary gear set is also increased by one. However, as mentioned above, in the sense of the present invention, the first planetary gear set, the second planetary gear set and the third planetary gear set are preferably implemented as a negative planetary gear set.

[0025] The motor vehicle transmission according to the invention has at least a first switching element, a second switching element, a third switching element and a fourth switching element in terms of function, and by selectively operating these switching elements, different power flow guides can be presented in the motor vehicle transmission according to the invention, that is, different power flow guides from the respectively associated drive shafts to the output shaft. In a variant of the invention, at least these four switching elements are present in the motor vehicle transmission according to the invention in terms of function, for switching out different gears between the two drive shafts and the output shaft, but wherein, within the scope of the invention, more switching elements that are at least functionally arranged can also be present if necessary in order to switch out other gears. In the sense of the invention, the respective switching elements are "at least functionally" arranged, meaning that at least the respective functions of the respective switching elements are reflected in the motor vehicle transmission according to the invention. Here, the switching element can be physically present as a single switching element, or its function can also be reflected by other components, such as a switching device. The component that reflects the function can combine the functions of two or more switching elements in one device.

[0026] In the motor vehicle transmission according to the invention, the drive shaft and the output shaft are arranged coaxially with each other, wherein the planetary gear set is also preferably arranged coaxially with the drive shaft and the output shaft. This allows a particularly compact design of the motor vehicle transmission in the radial direction.

[0027] In the sense of the invention, a permanent "rotationally fixed" connection of components of a transmission means that the components that are connected to one another in a rotationally fixed manner or are connected to one another in a rotationally fixed manner are rigidly connected to one another and therefore always have the same rotational speed. The components that are connected to one another in a rotationally fixed manner or are connected to one another in a rotationally fixed manner can be present as separate components that are fastened to one another. Alternatively, the components that are connected to one another in a rotationally fixed manner or are connected to one another in a rotationally fixed manner can also be designed in one piece and therefore exist together as a component, wherein this is achieved in particular when the components are arranged spatially close to one another.

[0028] Within the scope of the invention, the immobilization of a component of a motor vehicle transmission is achieved in particular by a rotationally fixed connection to a permanently fixed component, which may be a housing of the motor vehicle transmission, a part of the housing or a component which is permanently connected to the housing in a rotationally fixed manner. In the present case, the third element of the second planetary gear set is permanently connected to the fixed component in a rotationally fixed manner, wherein this also conceivably allows the third element of the second planetary gear set to be constructed integrally with the fixed component.

[0029] In the sense of the invention, the fixing of components of a motor vehicle transmission via at least a functionally provided switching element or the realization of a rotationally fixed connection between components of a motor vehicle transmission via at least a functionally provided switching element means that the relevant components are not permanently fixed or the components are not permanently coupled to each other, but the fixing or rotationally fixed connection is only achieved by the actuated state of the at least functionally provided switching element located in the middle. Here, the actuated state of the at least functionally provided switching element in the sense of the invention means that the relevant switching element is transferred into the closed state and causes the components directly coupled thereto to be commensurate with respect to their rotational movement. Here, if at least the function of a positive-locking switching element is reflected, the components directly connected to each other in a rotationally fixed manner via the positive-locking switching element will run at the same speed, while in the case of at least a non-positive-locking switching element, there may be a speed difference between the components even after the actuated state of the non-positive-locking switching element is reflected. However, within the scope of the invention, such a desired or undesired state is still referred to as a rotationally fixed connection of the respective components achieved via at least a functionally provided switching element.

[0030] According to one embodiment of the present invention, at least the functionally provided second shifting element, in the actuated state, connects the third element of the first planetary gear set and the second element of the first planetary gear set to each other in a rotationally fixed manner, or connects the third element of the first planetary gear set and the first element of the first planetary gear set to each other in a rotationally fixed manner. As a result, a rotationally fixed connection of two elements of the first planetary gear set occurs, and thus an interlocking of the first planetary gear set occurs. However, within the scope of the present invention, it is also possible to cause the interlocking of the first planetary gear set when the second shifting element is actuated in the following manner, that is, in the actuated state of the second shifting element, the first element of the first planetary gear set and the second element of the first planetary gear set are connected to each other in a rotationally fixed manner.

[0031] In the improved scheme of the above-mentioned embodiment, the first switching element and the second switching element are formed by a switching device, and the coupling element of the switching device can be positioned in the first switching position and the second switching position. The coupling element functionally reflects the manipulated state of the first switching element in the first switching position, and connects the third element of the first planetary gear set to the output shaft in a relatively rotationally fixed manner. In the second switching position, the coupling element functionally reflects the manipulated state of the second switching element, and connects the third element of the first planetary gear set to either the second element of the first planetary gear set or the first element of the first planetary gear set in a relatively rotationally fixed manner. The advantage of reflecting the functions of the first switching element and the second switching element by a switching device is that the respective relatively rotationally fixed connections can be realized in a compact manner using a small number of structural original elements. In addition, a common actuator can also be used to operate the first switching element and the second switching element, thereby reducing the manufacturing cost. Particularly preferably, the coupling element can be positioned in a neutral position located in the middle between the first and second switching positions, wherein no coupling via the coupling element is performed in the neutral position, that is, the first switching element and the second switching element are both in a disconnected state. In this context, a “switching position” or “neutral position” within the scope of the invention may be an axial adjustment range within which the coupling element is positioned in order to achieve the respective switching position or the respective neutral position.

[0032] The above-mentioned shifting device is designed in particular so that the coupling element is guided in a rotationally fixed manner and axially displaceable manner on a first toothing connected in a rotationally fixed manner to the third element of the first planetary gear set in the two shifting positions and during an axial displacement between the two shifting positions. In addition, the coupling element in the first shifting position also engages in a second toothing which is continuously connected in a rotationally fixed manner to the output shaft, wherein the coupling element in the second shifting position engages in a third toothing which is rotationally fixedly connected to the second element of the first planetary gear set or the first element of the first planetary gear set.

[0033] One embodiment of the present invention is that, at least functionally, an additional switching element is provided, which is configured to immobilize the third element of the first planetary gear set in an actuated state. As a result, an additional transmission ratio is presented between the first drive shaft and the output shaft, and thus it is also possible to connect the first drive engine connected to the first drive shaft with the additional transmission ratio. Therefore, the additional transmission ratio is presented by the actuated state of the additional switching element and is switched between the first drive shaft and the output shaft.

[0034] In the improved scheme of the above-mentioned embodiment of the present invention and in combination with the design feasibility of combining the first switching element and the second switching element into a switching device, the switching device forming the first switching element and the second switching element also forms another switching element. Here, the coupling element of the switching device can also be positioned in a third switching position, in which the coupling element functionally reflects the manipulated state of the other switching element and fixes the third element of the first planetary gear set. This has the advantage that the functions of the three switching elements in the form of the first switching element, the second switching element and the other switching element are thus reflected by the switching device, thereby making it possible to make the structure of the motor vehicle transmission particularly compact. In particular, the coupling element of the switching device can occupy another second neutral position between the second switching position and the third switching position, in which another second neutral position, no anti-rotation connection is made to the third element of the first planetary gear set.

[0035] Preferably, the coupling element of the switching device is in engagement with a fourth toothing which is permanently fixed in the third switching position.

[0036] The coupling element of the shifting device is present in particular as a sliding sleeve. Preferably, the coupling element has one or more coupling teeth, on which an axial rotationally fixed guidance on a first toothing and / or engagement in a second and third and possibly fourth toothing can take place. These teeth are preferably designed as dog teeth, so that the function of an asynchronous dog shifting element is reflected by the shifting device.

[0037] Alternatively, the first switching element and the second switching element and possibly further switching elements may also exist as a single switching element, wherein these switching elements are in this case particularly implemented as shape-locking switching elements and are particularly preferably implemented as asynchronous tooth-type switching elements. However, as another alternative, the single switching element may also be constructed as a locking synchronizing part or as a force-locking switching element, in particular in the form of a diaphragm switching element. In addition, within the scope of the present invention, the first switching element and the further switching element may also be combined into a switching device, while the second switching element is designed as a single switching element. As another alternative, within the scope of the present invention, it is also considered that the second switching element and the further switching element constitute a switching device, wherein the first switching element exists as a single switching element.

[0038] According to another design possibility of the present invention, at least the fourth switching element provided in function connects the third element of the third planetary gear set to the second element of the third planetary gear set or to the first element of the third planetary gear set in a rotationally fixed manner when the fourth switching element provided in function is actuated. As a result, a rotationally fixed connection is respectively created between the two elements of the third planetary gear set, and thus the interlocking of the third planetary gear set is achieved. However, as an alternative to this, it is also easily conceivable within the scope of the present invention that the first element of the third planetary gear set and the second element of the third planetary gear set are connected to each other in a rotationally fixed manner when at least the fourth switching element provided in function is actuated.

[0039] In an improved scheme of the above-mentioned design feasibility scheme, the third switching element and the fourth switching element are formed by a switching device, and the coupling element of the switching device can be positioned in a first switching position and a second switching position, respectively. Here, the coupling element functionally reflects the manipulated state of the third switching element in the first switching position, and connects the third element of the third planetary gear set to the output shaft in a relatively rotationally fixed manner, wherein the coupling element functionally reflects the manipulated state of the fourth switching element in the second switching position, and connects the third element of the third planetary gear set to either the second element of the third planetary gear set or the first element of the third planetary gear set in a relatively rotationally fixed manner. Thus, a compact structure is achieved in the following manner, that is, the functions of the third switching element and the fourth switching element are reflected by a common switching device. Therefore, only one adjusting actuator is required to represent the manipulated state of the two switching elements, and the coupling element can be positioned in different switching positions via the adjusting actuator. In particular, the coupling element can also be positioned in a neutral position located in the middle between the switching positions, in which neither the manipulated state of the third switching element nor the manipulated state of the fourth switching element is represented. In this context, within the scope of the invention, a “switching position” or a “neutral position” may also be an axial adjustment range within which the coupling element is positioned in order to achieve the respective switching position or the respective neutral position.

[0040] Preferably, the coupling element of the switching device is guided in a rotationally fixed manner and axially movable on a first toothing in the two switching positions and during the axial displacement between the two switching positions, wherein the first toothing is connected to the third element of the third planetary gear set in a rotationally fixed manner. In the first switching position, the coupling element engages in a second toothing that is permanently connected to the output shaft in a rotationally fixed manner. When moving to the second switching position, the coupling element comes into tooth engagement with a third toothing that is permanently connected to the second element of the third planetary gear set or the first element of the third planetary gear set in a rotationally fixed manner.

[0041] In particular, a further transmission ratio can be achieved between the second drive shaft and the output shaft, for which an additional shifting element is provided, at least functionally. The additional shifting element is designed to immobilize the third element of the third planetary gear set in the actuated state. The further transmission ratio is then switched between the second drive shaft and the output shaft by achieving the actuated state of the additional shifting element.

[0042] In addition, when the above-mentioned variant of the present invention is combined with an embodiment in which the third switching element and the fourth switching element form a switching device, the switching device forming the third switching element and the fourth switching element also forms an additional switching element. Here, the coupling element of the switching device can also be positioned in the third switching position, in which the coupling element functionally reflects the manipulated state of the additional switching element and fixes the third element of the third planetary gear set. Therefore, the functions of the three switching elements in the form of the third switching element, the fourth switching element and the additional switching element are reflected by the switching device, which can realize a compact structure of the motor vehicle transmission. In particular, the coupling element of the switching device can occupy another second neutral position between the second switching position and the third switching position, in which the third element of the third planetary gear set is also not connected to relative rotation. Preferably, the coupling element of the above-mentioned switching device is engaged with the fourth tooth portion that is permanently fixed in the third switching position.

[0043] The coupling element is preferably designed as a sliding sleeve. In particular, the coupling element also has one or more coupling teeth, on which an axial rotationally fixed guidance on the first toothing can take place and / or engagement in the second and third and possibly fourth toothing can take place. The toothing of the shifting device is preferably implemented as a dog toothing, so that the function of the third shifting element and the fourth shifting element and possibly additional shifting elements is reflected as asynchronous dog shifting elements via the shifting device.

[0044] However, alternatively, the third switching element and the fourth switching element and possibly additional switching elements may also exist as a single switching element, wherein these switching elements are in this case especially implemented as shape-locking switching elements and are particularly preferably implemented as asynchronous tooth-type switching elements. However, implementations as locking synchronizing parts or as force-locking switching elements are also considered, in particular implementations as diaphragm switching elements. In addition, within the scope of the present invention, the third switching element and the additional switching element may also form a switching device, while the fourth switching element is designed as a single switching element. As a further alternative, within the scope of the present invention, it is also considered that the fourth switching element and the additional switching element form a switching device, wherein the third switching element exists as a single switching element.

[0045] More particularly preferably, the motor vehicle transmission according to the present invention has a structure in which a first switching device and a second switching device are provided, wherein the first switching device reflects the first switching element, the second switching element and possible additional switching elements, while the functions of the fourth switching element and the fifth switching element and possible additional switching elements are reflected by the second switching device.

[0046] According to another design possibility of the present invention, the planetary gear sets are arranged axially in the order of the first planetary gear set, the third planetary gear set and the second planetary gear set. It is particularly preferred that the coupling part of the output shaft is axially arranged on the side of the second planetary gear set facing away from the third planetary gear set. However, within the scope of the present invention, such a coupling part of the output shaft may also be axially located on the side of the first planetary gear set facing away from the third planetary gear set.

[0047] In an improved solution of the above-mentioned design feasible solution, at least the first switching element that is functionally provided and at least the second switching element that is functionally provided are arranged axially on the side of the first planetary gear set that is away from the third planetary gear set. If the two switching elements are formed by a common switching device, the switching device is axially located on the side of the first planetary gear set that is away from the third planetary gear set. In particular, the switching elements or the switching devices that form these switching elements are arranged radially on the periphery of the first planetary gear set. In addition, if another switching element is at least functionally provided or designed by the switching device, the switching element or the switching device is also axially located on the side of the first planetary gear set that is away from the third planetary gear set, and preferably radially located on the periphery of the first planetary gear set.

[0048] Alternatively or in addition to this, at least the third switching element that is functionally provided and at least the fourth switching element that is functionally provided are arranged axially between the third planetary gear set and the second planetary gear set. When the third switching element and the fourth switching element form a switching device, the switching device is arranged axially between the third planetary gear set and the second planetary gear set. In particular, the third switching element and the fourth switching element or the switching device that forms the third switching element and the fourth switching element are radially located on the periphery of the third planetary gear set and the second planetary gear set. If the motor vehicle transmission according to the present invention also has an additional switching element, or the additional switching element is formed by the switching device, the additional switching element or the switching device that forms the additional switching element is also arranged axially between the third planetary gear set and the second planetary gear set, and is further preferably arranged radially on the periphery of the third planetary gear set and the second planetary gear set.

[0049] The subject of the invention is also a drive unit which, in addition to a first electric machine and a second electric machine, has a motor vehicle transmission according to one or more of the above-described variants. In this case, the rotor of the first electric machine is coupled to a first drive shaft of the motor vehicle transmission, and the rotor of the second electric machine is coupled to a second drive shaft. In this case, within the scope of the invention, the respective electric machines can in particular be operated as generators on the one hand and as electric motors on the other hand. This makes it possible to provide an application suitable for use in motor vehicles in the form of electric vehicles or hybrid vehicles. In this case, the two electric machines are designed in particular to be of the same specification with regard to their power, but can also have different powers.

[0050] It is particularly preferred that the first electric machine is arranged coaxially with the first drive shaft and that the rotor of the first electric machine is connected to the first drive shaft in a rotationally fixed manner. As a result, the first drive shaft and the rotor of the first electric machine rotate at the same speed during operation. Alternatively, it is also conceivable that the rotor of the first electric machine is coupled to the first drive shaft via at least one transmission ratio step.

[0051] Alternatively, but preferably in addition thereto, in the drive unit according to the invention, the second electric machine is arranged coaxially, in particular, with the second drive shaft of the motor vehicle transmission, wherein the rotor of the second electric machine is connected to the second drive shaft in a rotationally fixed manner. Thus, the rotor of the second electric machine and the second drive shaft of the motor vehicle transmission have the same rotational speed during operation. Alternatively to this, however, the rotor of the second electric machine and the second drive shaft can also be coupled to one another via at least one intermediate transmission ratio step.

[0052] In a further development of the invention, the first planetary gear set of the motor vehicle transmission is arranged axially at least partially overlapping the rotor of the first electric machine and radially inside the rotor of the first electric machine, thereby enabling a nested and therefore also compact design of the drive unit.

[0053] Alternatively, but preferably in addition thereto, the second planetary gear set and / or the third planetary gear set are each arranged axially at least partially overlapping with the rotor of the second electric machine and radially inwardly relative to the rotor of the second electric machine. This advantageously enables the axial length of the drive unit and thus a compact design.

[0054] The drive unit implemented according to one or more of the above-mentioned variants is in particular provided as part of a motor vehicle drive axle for an electric vehicle or a hybrid vehicle. Preferably, the drive unit is arranged in a plane with output shafts, which are respectively assigned to at least one drive wheel and are coupled to an output shaft of the motor vehicle transmission. This advantageously enables a compact design of the motor vehicle drive axle with the drive unit, wherein the coupling between the output shaft of the motor vehicle transmission and the output shaft of the motor vehicle drive axle is realized in particular via a differential.

[0055] Within the scope of the invention, at least one such motor vehicle drive axle is arranged in a hybrid vehicle or electric vehicle, which can be a passenger vehicle or a commercial vehicle. The commercial vehicle can be present as an at least partially electrically driven means of transport or a light to medium-duty bus or truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The advantageous embodiments of the invention explained below are shown in the accompanying drawings. In which:

[0057] Figure 1 shows a schematic view of a drive unit according to an embodiment of the present invention;

[0058] Figure 2 Shows Figure 1 An exemplary shift diagram of a motor vehicle transmission of a drive unit of;

[0059] Figure 3 shows a schematic diagram of a drive unit according to another embodiment of the present invention;

[0060] Figure 4 Shows Figure 3 An exemplary shift diagram of a motor vehicle transmission of a drive unit of;

[0061] Figure 5shows a schematic view of a drive unit according to a further embodiment of the present invention;

[0062] Figure 6 Shows Figure 5 An exemplary shift diagram of a motor vehicle transmission of a drive unit of;

[0063] Figure 7 shows a schematic diagram of a drive unit according to another embodiment of the present invention;

[0064] Figure 8 Shows Figure 7 An exemplary shift diagram of a motor vehicle transmission of a drive unit of

[0065] Fig. 9 A schematic view showing an electric vehicle according to a preferred embodiment of the present invention; DETAILED DESCRIPTION

[0066] Figure 1 A schematic view of a drive unit 1 designed according to an embodiment of the invention is shown. The drive unit 1 consists of a motor vehicle transmission 2 and two electric machines 3 and 4, wherein the motor vehicle transmission 2 is designed according to a first embodiment of the invention. The two electric machines 3 and 4 are formed in a manner known in principle to a person skilled in the art by a stator 5 or 6 and a rotor 7 or 8, wherein the respective electric machine 3 or 4 can be operated as a generator on the one hand and as an electric motor on the other hand.

[0067] The motor vehicle transmission 2 comprises a first drive shaft 9, a second drive shaft 10, an output shaft 11 and three planetary gear sets P1, P2 and P3, each of which consists of a first element E11 or E12 or E13, a second element E21 or E22 or E23 and a third element E31 or E32 or E33. Here, the first element E11 or E12 or E13 of the respective planetary gear set P1 or P2 or P3 is a sun gear 12 or 13 or 14, respectively, and the second element E21 or E22 or E23 of the respective planetary gear set P1 or P2 or P3 is implemented as a planet carrier 15 or 16 or 17, respectively. In addition, the respective third element E31 or E32 or E33 of the respective planetary gear set P1 or P2 or P3 is present as a respective ring gear 18 or 19 or 20 of the respective planetary gear set P1 or P2 or P3.

[0068] In the respective planet carrier 15 or 16 or 17 of the respective planetary gear set P1 or P2 or P3, at least one planet gear 21 or 22 or 23 is rotatably mounted, which planet gears are in toothed engagement not only with the respective sun gear 12 or 13 or 14 of the respective planetary gear set P1 or P2 or P3 but also with the respective ring gear 18 or 19 or 20. In this respect, the planetary gear sets P1, P2 and P3 are designed as negative planetary gear sets in the present case.

[0069] In the present case, the first element E11 of the first planetary gear set P1 is connected to the first drive shaft 9 in a rotationally fixed manner, and the first drive shaft is also connected to the rotor 7 of the electric machine 3 in a rotationally fixed manner at the coupling point 24. In this respect, the first element E11 of the first planetary gear set P1 and the rotor 7 are also connected to each other in a rotationally fixed manner via the first drive shaft 9, so that the first element E11 and the rotor 9 always rotate at the same speed. Within the scope of the present invention, the first drive shaft 9 can be formed integrally with the first element E11 of the first planetary gear set P1 and / or with the rotor 7 of the electric machine 3.

[0070] The second element E21 of the first planetary gear set P1, the first element E12 of the second planetary gear set P2 and the second element E23 of the third planetary gear set P3 are permanently connected to one another in a rotationally fixed manner, wherein the rotationally fixed connection is established here via a shaft 25, which can be designed integrally with one or more of the elements E21, E12, E23 if necessary. The third element E32 of the second planetary gear set P2 is permanently connected to a permanently fixed structural element 26 in a rotationally fixed manner, which is a transmission housing, a part of a transmission housing or a component connected to the transmission housing in a rotationally fixed manner of the motor vehicle transmission 2. In this case, in addition to the components of the motor vehicle transmission 2, the two electric machines 3 and 4 are preferably also accommodated in the transmission housing of the motor vehicle transmission 2. Due to the permanent rotationally fixed connection with the rotationally fixed structural element 26, the third element E32 of the second planetary gear set P2 is permanently prevented from rotating.

[0071] from Figure 1It can be seen that the second drive shaft 10 is connected to the rotor 8 of the motor 4 in a rotationally fixed manner on the one hand, and is connected to the first element E13 of the third planetary gear set P3 in a rotationally fixed manner on the other hand, so that the second drive shaft 10, the rotor 8 and the first element E13 of the third planetary gear set P3 always rotate at the same speed. The rotationally fixed connection with the rotor 8 is established at the coupling portion 27 of the second drive shaft 10, wherein the second drive shaft 10 may be integrally formed with the rotor 8 of the motor 4 and / or integrally formed with the first element E13 of the third planetary gear set P3. The output shaft 11 is connected to the second element E22 of the second planetary gear set P2 in a rotationally fixed manner, wherein the output shaft 11 is also connected to the differential gear set of the differential (not shown at present) at the coupling portion 28, in particular.

[0072] Furthermore, the motor vehicle transmission 2 functionally has four shift elements B, C, E and F. The shift elements B and C are formed by the shift device 29 , while the function of the shift elements E and F is reflected by the shift device 30 .

[0073] The switching device 29 has a coupling element 31 in the form of a switching sleeve, which can be positioned in a first switching position and a second switching position as well as in a neutral position in the middle. The positioning is performed by an actuator (not shown further at present). The coupling element 31 of the switching device 29 is guided in a rotationally fixed manner and axially displaceable on a toothing 32 connected in a rotationally fixed manner to the third element E31 of the first planetary gear set P1.

[0074] The coupling element 31 can be Figure 1 On the one hand, the neutral position shown in FIG is moved into a first shift position in which the coupling element 31 engages with the toothing 32 in a toothed manner in a toothed section 33 which is connected to the output shaft 11 in a rotationally fixed manner. This will then correspondingly result in the third element E31 of the first planetary gear set P1 being connected to the output shaft 11 and thus also to the second element E22 of the second planetary gear set P2 in a rotationally fixed manner. In the first shift position of the coupling element 31, the actuated state of the shift element A is represented.

[0075] On the other hand, the coupling element 31 can be moved from the neutral position into the second shift position, in which the coupling element 31 then bites into the toothing 34 while being in toothed engagement with the toothing 32 as before, which is connected to the shaft 25 in a rotationally fixed manner and thus also to the second element E21 of the first planetary gear set P1, the first element E12 of the second planetary gear set P2 and the second element E23 of the third planetary gear set P3. Thus, in the second shift position of the coupling element 31, the third element E31 of the first planetary gear set P1 is connected to the second element E21 of the first planetary gear set P1 in a rotationally fixed manner, which results in the locking of the first planetary gear set P1. In the second shift position of the coupling element 31, the actuated state of the shift element C is represented.

[0076] A coupling element 35 in the form of a shift sleeve is also provided in the shifting device 30, which is moved to the position of the shifting element by means of an actuator (not shown in detail at this moment). Figure 1 In addition to the neutral position shown in FIG. 1 , it can also be moved to the first switching position on the one hand and to the second switching position on the other hand. The coupling element 35 is guided here in a rotationally fixed manner and axially movable on a toothed portion 36 connected to the third element E33 of the third planetary gear set P3 in a rotationally fixed manner. When the coupling element 35 is positioned in the first switching position, the actuated state of the switching element E is represented, wherein the coupling element 35 is additionally engaged in the toothed portion 37 connected to the output shaft 11 in a rotationally fixed manner while being in tooth meshing with the toothed portion 36. As a result, in the first switching position of the coupling element 35, the output shaft 11 is connected to the third element E33 of the third planetary gear set P3 in a rotationally fixed manner.

[0077] If the coupling element 35 is transferred from the neutral position to the second shift position, the actuated state of the shift element F is indicated by the shift device 30. In this second shift position, the coupling element 35 additionally engages in the toothing 38 which is connected in a rotationally fixed manner to the shaft 25 and thus also to the second element E23 of the third planetary gear set P3 while being in toothed engagement with the toothing 36. Thus, in the second shift position of the coupling element 35, the third planetary gear set P3 is locked.

[0078] from Figure 1 It can be seen that the first drive shaft 9, the second drive shaft 10, the output shaft 11 and the planetary gear sets P1, P2 and P3 are arranged coaxially with each other, and in addition to the shaft 25, the two electric machines 3 and 4 are also arranged coaxially therewith. The planetary gear sets P1, P2 and P3 are arranged in the order of the first planetary gear set P1, the third planetary gear set P3 and finally the second planetary gear set P2 in this axial direction, wherein the second planetary gear set is adjacent to the coupling point 28 of the output shaft 11 in this axial direction.

[0079] In the present case, the third planetary gear set P3 is arranged to completely overlap the second motor 4 axially, while the second planetary gear set P2 is arranged to partially overlap the second motor axially, wherein the two planetary gear sets P2 and P3 are radially arranged inside the second motor 4. In addition, the first planetary gear set P1 is arranged axially at the height of the first motor 3 and radially inside the first motor.

[0080] The shifting device 29 is axially arranged on the side of the first planetary gear set P1 facing away from the third planetary gear set P3, wherein the shifting device 29 is arranged axially overlapping with the first electric machine 3. The shifting device 29 is located between the first planetary gear set P1 and the first electric machine 3 in the radial direction.

[0081] The switching device 30 is axially arranged between the third planetary gear set P3 and the second planetary gear set P2 and axially overlaps the second motor 4. Radially, the switching device 30 is arranged between the second motor 4 on the one hand and the third planetary gear set P3 and the second planetary gear set P2 on the other hand.

[0082] The output shaft 11 is substantially designed as a solid shaft and extends axially from the coupling point 28 to the opposite end of the motor vehicle transmission 2, while the first drive shaft 9, the second drive shaft 10 and the shaft 25 are designed as hollow shafts. The first drive shaft 9 extends axially adjacent to the first planetary gear set P1 and radially outwards from the first element E11 of the first planetary gear set P1 to the electric motor 3, while the second drive shaft 10 is axially arranged in the region of the third planetary gear set P3 and radially outwards from the first element E13 of the third planetary gear set P3 to the electric motor 4. The shaft 25 extends radially between the output shaft 11 and the planetary gear sets P1 to P3 as a hollow shaft, wherein the shaft 25 is guided axially from the second planetary gear set P2 to the side of the first planetary gear set P1 facing away from the third planetary gear set P3 and there connects to the second element E21 of the first planetary gear set.

[0083] Figure 2 The table shows Figure 11 shows an exemplary shifting diagram of a motor vehicle transmission 2. It can be seen that different transmission ratios E1.1, E1.2, E2.1 and E2.2 can be switched in the motor vehicle transmission 2, wherein in the columns of the shifting diagram, which of the shifting elements B, C, E and F formed by the shifting devices 29 and 30 exhibits an actuated state in the respective transmission ratio is marked with an X. In this case, in each of the transmission ratios E1.1, E1.2, E2.1 and E2.2, one of the shifting elements B, C, E and F exhibits an actuated state. In this case, the transmission ratios E1.1 and E1.2 act respectively between the first drive shaft 9 and the output shaft 11 and thus respectively enable the coupling of the motor 3 to the output shaft 11, while the transmission ratios E2.1 and E2.2 are respectively switched between the second drive shaft 10 and the output shaft 11 and are respectively used to connect the motor 4.

[0084] from Figure 2 It can be seen that the transmission ratio E1.1 is switched between the first drive shaft 9 and the output shaft 11 by representing the actuated state of the shift element B in the shift device 29. To switch to the transmission ratio E1.2, the actuated state of the shift element C is realized in the shift device 29. Whichever of the transmission ratios E1.1 and E1.2 is switched, the second drive shaft 10 can be coupled to the output shaft 11 with the transmission ratio E2.1 on the one hand, by representing the actuated state of the shift element E in the shift device 30. On the other hand, the transmission ratio E2.2 between the second drive shaft 10 and the output shaft 11 is realized by representing the actuated state of the shift element F in the shift device 30.

[0085] The transmission ratios E1.1 and E1.2 can now be switched independently of the transmission ratios E2.1 and E2.2, so that the motors 3 and 4 can also be switched in or out independently of each other. Thus, in the drive unit, it is possible to drive via one motor 3 or 4 without any problems, while the other motor 4 or 3 is out of operation. Furthermore, the traction force support via the motor 3 or 4 can be carried out with the assigned transmission ratios E1.1 and E1.2 or E2.1 and E2.2, while the changeover can be carried out between the transmission ratios E2.1 and E2.2 or E1.1 and E1.2 assigned to the other motor 4 or 3.

[0086] Figure 3 1 shows a schematic diagram of a drive unit 39 constructed according to another embodiment of the present invention. Here, the drive unit 39 largely corresponds to the drive unit 39 according to Figure 1The previous variant differs in that in the motor vehicle transmission 40 of the drive unit 39 a switching device 41 is now provided instead of the switching device 29, which in addition to the functions of the switching elements B and C also embodies the function of a further switching element A.

[0087] According to Figure 1 In accordance with the variant scheme, the switching device 41 includes a coupling element 31, which is guided on a tooth portion 32 in a manner that is non-rotatable and axially movable, and in a first switching position, the operating state of the switching element B is represented by the engagement of the teeth in the tooth portion 33, and in a second switching position, the operating state of the switching element C is represented by the engagement of the teeth in the tooth portion 34.

[0088] However, with Figure 1 Unlike the shifting device 29 of the motor vehicle transmission 2, the coupling element 31 can now be moved axially from the first shift position (actuated state B) in the direction of one of the neutral positions, and can also be moved axially in the opposite direction into a further neutral position, in which the coupling element 31 also does not couple the third element E31 of the first planetary gear set P1. From this further neutral position, the coupling element 31 can be moved axially again on the one hand into the first shift position (actuated state B) and on the other hand into the third shift position, in which the coupling element 31 engages in the further toothing 42 while being in toothed engagement with the toothing 32. The toothing 42 is connected to the permanently fixed structural element 26 in a rotationally fixed manner and is thus also permanently fixed, so that the coupling element 31 in the third shift position causes the third element E31 of the first planetary gear set P1 to be fixed. This represents the actuated state of the further shifting element A. The switching device 41 is here again axially arranged on the side of the first planetary gear set P1 facing away from the third planetary gear set P3 and radially arranged between the first planetary gear set P1 and the motor 3. Figure 3 The implementation method also corresponds to Figure 1 , and thus reference is made to the description related thereto.

[0089] Figure 4 Shows Figure 31 , in which the transmission ratios E1.1', E1.2' and E1.3' can be switched between the first drive shaft 9 and the output shaft 11 for connecting the motor 3, and the transmission ratios E2.1 and E2.2 can be switched between the second drive shaft 10 and the output shaft 11 for connecting the motor 4. The transmission ratio E1.1' is switched here by realizing the actuated state of the switching element A in the switching device 41. The transmission ratio E1.2' corresponds to Figure 2 The transmission ratio E1.1 and the transmission ratio E1.3' correspond to Figure 2 The transmission ratio E1.2 is similar to that of the transmission ratio E2.1 and E2.2. Figure 2 The manner of switching the diagram is represented by the switching device 30, so that reference is made in this respect to Figure 2 Traction support can also be similar to Figure 2 This can be achieved in the described way.

[0090] also, Figure 5 A schematic illustration of a drive unit 43 according to a further possible embodiment of the invention is shown, wherein the drive unit 43 corresponds largely to Figure 1 A variation of . Figure 1 The difference between the drive unit 1 and the drive unit 43 is that, instead of the shift device 30 , the motor vehicle transmission 44 of the drive unit 43 has a shift device 45 , by which, in addition to the functions of the shift elements E and F, the function of the shift element D is also reflected.

[0091] According to Figure 1 As in the variant, the switching device 45 has a coupling element 35, which is guided on the toothing 36 in a manner that is non-rotatable and axially movable, and in the first switching position, the switching element E is displayed in an actuated state by the tooth engagement in the toothing 37, and in the second switching position, the switching element F is displayed in an actuated state by the tooth engagement in the toothing 38.

[0092] However, in the shifting device 45, the coupling element 35 can now be moved from the first shifting position (actuated state E) in the axial direction opposite to the second shifting position and thus transferred to a further neutral position, in which the coupling element 35 again does not couple the third element E33 of the third planetary gear set P3. By further axial displacement in this direction, the coupling element 35 is then transferred to the third shifting position, in which the coupling element 35 exhibits the actuated state of the shifting element D and in which the coupling element engages in the further toothing 46 while meshing with the toothing 36. The toothing 46 is permanently connected to the permanently fixed structural element 26 in a rotationally fixed manner, so that the toothing 46 is also permanently fixed and therefore the third element E33 of the third planetary gear set P3 is fixed when the coupling element 35 engages in the toothing 46.

[0093] In the present case, the switching device 45 is arranged axially between the third planetary gear set P3 and the second planetary gear set P2, and radially between the planetary gear sets P2 and P3 on the one hand and the electric machine 4 on the other hand. Figure 5 The implementation scheme corresponds to Figure 1 , and thus reference is made to the relevant description.

[0094] Figure 6 It is shown in Figure 5 An exemplary switching diagram of a motor vehicle transmission 44. It can be seen here that here, on the one hand, transmission ratios E1.1 and E1.2 can be switched between the first drive shaft 9 and the output shaft 11 for connecting the electric machine 3, wherein this is similar to Figure 2 The above-described method is realized via the switching device 29. On the other hand, the transmission ratios E2.1', E2.2' and E2.3' can be realized between the second drive shaft 10 and the output shaft 11 for respectively switching on the electric machine 4. In this case, the transmission ratio E2.1' is switched out by realizing the actuated state of the switching element D in the switching device 45 of the vehicle transmission 44. The transmission ratio E2.2' corresponds to Figure 2 The transmission ratio E2.1 corresponds to the transmission ratio E2.3' Figure 2 Thus, in the case of a transmission ratio E2.2', the actuated state of the switching element E is represented in the switching device 45, and in the case of a transmission ratio E2.3', the actuated state of the switching element F is represented in the switching device 45. In this regard, reference is made to Figure 2 Again, traction support can also be used in a similar way to Figure 2 The described method is implemented.

[0095] also, Figure 7A schematic view of a drive unit 47 constructed according to another embodiment of the present invention is shown. Here, the drive unit 47 is made to behave according to the following manner: Figure 3 and Figure 5 The combination of the two variants of FIG. 4 is that in the motor vehicle transmission 48 of the drive unit 47, not only the switching device 41 but also the switching device 45 is provided. For the respective structures and respective arrangements of the switching devices 41 and 45 and further structural aspects of the motor vehicle transmission 48, reference is made to Figure 3 or Figure 5 Description of Figure 7 An exemplary shift diagram of a motor vehicle transmission 48 is shown in FIG. Figure 8 It can be seen that the transmission ratios E1.1′, E1.2′, E1.3′, E2.1′, E2.2′ and E2.3′ can now also be shifted out in the motor vehicle transmission 48 .

[0096] at last, Fig. 9 A schematic view of an electric vehicle 49 is also shown. The electric vehicle is in particular an electric commercial vehicle, such as a transport vehicle. In addition to a steerable non-driven axle 50, the electric vehicle 49 also has a motor vehicle drive axle 51 with driven wheels 52 and 53. In addition, a drive unit 54 is part of the motor vehicle drive axle 51, which is connected to the drive unit 54 in this case. Figure 1 , Figure 3 , Figure 5 and Figure 7 The drive wheels 52 and 53 are coupled to the output shaft of the drive unit 54 via a centrally located differential gear set (not shown at the moment).

[0097] Axle 50 is the front axle of electric vehicle 49 and motor vehicle drive axle 51 is the rear axle of electric vehicle 49 , but as an alternative or in addition to motor vehicle drive axle 51 , axle 50 can also be designed as a driven axle with a possibly similar drive unit structure.

[0098] By means of the embodiment according to the invention, a motor vehicle transmission can be provided in each case, via which an independent access to the two drive machines can be achieved.

[0099] Reference numerals list

[0100] 1Driver unit

[0101] 2 Vehicle transmission

[0102] 3 Motor

[0103] 4 Motor

[0104] 5. Stator

[0105] 6 Stator

[0106] 7 Rotors

[0107] 8 rotors

[0108] 9 Drive shaft

[0109] 10 Drive shaft

[0110] 11 Output shaft

[0111] 12Sun gear

[0112] 13Sun gear

[0113] 14Sun gear

[0114] 15 Planet carrier

[0115] 16 Planet carrier

[0116] 17 Planet carrier

[0117] 18 gear ring

[0118] 19 Ring gear

[0119] 20 gear ring

[0120] 21 planetary gear

[0121] 22 planetary gear

[0122] 23 planetary gear

[0123] 24Connection parts

[0124] 25 axis

[0125] 26 Permanent fixed structural elements

[0126] 27Connection

[0127] 28 connection parts

[0128] 29 Switching device

[0129] 30 Switching device

[0130] 31 coupling element

[0131] 32 teeth

[0132] 33 teeth

[0133] 34 teeth

[0134] 35 coupling element

[0135] 36 teeth

[0136] 37 teeth

[0137] 38 teeth

[0138] 39 drive unit

[0139] 40 Vehicle transmission

[0140] 41 Switching device

[0141] 42 teeth

[0142] 43 drive units

[0143] 44 Motor vehicle transmission

[0144] 45 Switching device

[0145] 46 teeth

[0146] 47 drive unit

[0147] 48 Motor vehicle transmission

[0148] 49 Electric vehicles

[0149] 50 Axle

[0150] 51Motor vehicle drive axle

[0151] 52 driving wheels

[0152] 53 driving wheels

[0153] 54 drive units

[0154] P1 first planetary gear set

[0155] P2 second planetary gear set

[0156] P3 third planetary gear set

[0157] E11 The first element of the first planetary gear set

[0158] E21 The second element of the first planetary gear set

[0159] E31 The third element of the first planetary gear set

[0160] E12 The first element of the second planetary gear set

[0161] E22 The second element of the second planetary gear set

[0162] E32 The third element of the second planetary gear set

[0163] E13 The first element of the third planetary gear set

[0164] E23 The second element of the third planetary gear set

[0165] The third element of the third planetary gear set of E33

[0166] A Switching element

[0167] B Switching element

[0168] C Switching element

[0169] D Switching Element

[0170] E Switching element

[0171] F Switching element

[0172] E1.1 transmission ratio

[0173] E1.2 Transmission ratio

[0174] E2.1 Transmission ratio

[0175] E2.2 Transmission ratio

[0176] E1.1' transmission ratio

[0177] E1.2' transmission ratio

[0178] E1.3' transmission ratio

[0179] E2.1' transmission ratio

[0180] E2.2' transmission ratio

[0181] E2.3' transmission ratio

Claims

1. A motor vehicle transmission (2; 40; 44; 48) for an at least partially electrically driven motor vehicle, the motor vehicle transmission comprising a first drive shaft (9), a second drive shaft (10), an output shaft (11) and a first planetary gear set (P1) and a second planetary gear set (P2), - in, The first drive shaft (9) is configured to be coupled to a first drive machine, in particular a first electric motor (3), and the second drive shaft (10) is configured to be coupled to a second drive machine, in particular a second electric motor (4). - wherein the first planetary gear set (P1) and the second planetary gear set (P2) each have a first element (E11, E12), a second element (E21, E22) and a third element (E31, E32) in the form of a respective sun gear (12, 13), a planet carrier (15, 16) and a ring gear (18, 19), respectively, - wherein at least a first switching element (B), a second switching element (C), a third switching element (E) and a fourth switching element (F) are functionally provided, - wherein the first element (E11) of the first planetary gear set (P1) is connected to the first drive shaft (9) in a manner that is non-rotatable, and the second element (E21) of the first planetary gear set (P1) is connected to the first element (E12) of the second planetary gear set (P2) in a manner that is non-rotatable, - wherein the third element (E32) of the second planetary gear set (P2) is stationary, wherein the second element (E22) of the second planetary gear set (P2) is connected to the output shaft (11) in a rotationally fixed manner, - wherein at least the functionally provided first shift element (B) is designed to connect the third element (E31) of the first planetary gear set (P1) to the output shaft (11) in a rotationally fixed manner in the actuated state, - and wherein at least the functionally provided second shift element (C) is designed to connect two elements (E11, E21, E31) of the first planetary gear set (P1) to one another in a rotationally fixed manner in the actuated state, The invention is characterized in that a third planetary gear set (P3) is also provided, wherein the third planetary gear set has a first element (E13), a second element (E23) and a third element (E33) in the form of a sun gear (14), a planet carrier (17) and a ring gear (20), and the second element (E23) of the third planetary gear set is connected to the second element (E21) of the first planetary gear set (P1) and the first element (E12) of the second planetary gear set (P2) in a manner that prevents relative rotation, and the first element (E13) of the third planetary gear set (P3) is connected to the second element (E21) of the first planetary gear set (P1) and the first element (E12) of the second planetary gear set (P2) in a manner that prevents relative rotation. The two drive shafts (10) are connected in a manner that is non-rotatable, and at least the third switching element (E) that is functionally arranged is set up to connect the third element (E33) of the third planetary gear set (P3) with the output shaft (11) in a manner that is non-rotatable when under actuation, and at least the fourth switching element (F) that is functionally arranged is set up to connect two elements (E13, E23, E33) of the third planetary gear set (P3) to each other in a manner that is non-rotatable when under actuation.

2. The motor vehicle transmission (2; 40; 44; 48) according to claim 1, characterized in that The at least functionally arranged second shift element (C) in an actuated state connects the third element (E31) of the first planetary gear set (P1) in a rotationally fixed manner to the second element (E21) of the first planetary gear set (P1) or the first element of the first planetary gear set.

3. The motor vehicle transmission (2; 40; 44; 48) according to any one of claims 2, characterized in that The first shift element (B) and the second shift element (C) are formed by a shift device (29; 41), the coupling element (31) of which can be positioned in a first shift position and a second shift position, respectively, wherein the coupling element (31) in the first shift position functionally reflects the actuated state of the first shift element (B) and connects the third element (E31) of the first planetary gear set (P1) to the output shaft (11) in a manner that is non-rotatable, and wherein the coupling element (31) in the second shift position functionally reflects the actuated state of the second shift element (C) and connects the third element (E31) of the first planetary gear set (P1) to the second element (E21) of the first planetary gear set (P1) or the first element of the first planetary gear set in a manner that is non-rotatable.

4. A motor vehicle transmission (40; 48) according to any one of claims 1 to 3, characterized in that At least functionally, a further shift element (A) is also provided, which is designed to immobilize the third element (E31) of the first planetary gear set (P1) in an actuated state.

5. A motor vehicle transmission (40; 48) according to claim 3 and claim 4, characterised in that The switching device (41) forming the first switching element (B) and the second switching element (C) also forms the further switching element (A), and the coupling element (31) of the switching device (41) can also be positioned in a third switching position, in which the coupling element (31) functionally reflects the actuated state of the further switching element (A) and immobilizes the third element (E31) of the first planetary gear set (P1).

6. A motor vehicle transmission (2; 40; 44; 48) according to any one of the preceding claims, characterized in that The at least functionally provided fourth shift element (F) in an actuated state connects the third element (E33) of the third planetary gear set (P3) in a rotationally fixed manner to the second element (E32) of the third planetary gear set (P3) or the first element of the third planetary gear set.

7. The motor vehicle transmission (2; 40; 44; 48) according to claim 6, characterized in that The third shift element (E) and the fourth shift element (F) are formed by a shift device (30; 45), the coupling element (35) of which can be positioned in a first shift position and a second shift position, respectively, wherein the coupling element (35) in the first shift position functionally reflects the actuated state of the third shift element (E) and connects the third element (E33) of the third planetary gear set (P3) to the output shaft (11) in a rotationally fixed manner, wherein the coupling element (35) in the second shift position functionally reflects the actuated state of the fourth shift element (F) and connects the third element (E33) of the third planetary gear set (P3) to the second element (E32) of the third planetary gear set (P3) or the first element of the third planetary gear set in a rotationally fixed manner.

8. A motor vehicle transmission (44; 48) according to any one of the preceding claims, characterised in that At least functionally, an additional shift element (D) is also provided, which is designed to immobilize a third element (E33) of the third planetary gear set (P3) in an actuated state.

9. A motor vehicle transmission (44; 48) according to claim 7 and claim 8, characterised in that The switching device (45) forming the third switching element (E) and the fourth switching element (F) also forms the additional switching element (D), and the coupling element (35) of the switching device (45) can also be positioned in a third switching position, in which the coupling element (35) functionally reflects the actuated state of the additional switching element (D) and immobilizes the third element (E33) of the third planetary gear set (P3).

10. A motor vehicle transmission (2; 40; 44; 48) according to any one of the preceding claims, characterized in that The planetary gear sets (P1, P2, P3) are arranged in the order of a first planetary gear set (P1), a third planetary gear set (P3) and a second planetary gear set (P2) in the axial direction.

11. The motor vehicle transmission (2; 40; 44; 48) according to claim 10, characterized in that At least the first functionally provided shift element (B) and at least the second functionally provided shift element (C) are arranged axially on a side of the first planetary gear set (P1) facing away from the third planetary gear set (P3).

12. A motor vehicle transmission (2; 40; 44; 48) according to claim 4 and any one of claims 10 or 11, characterized in that The at least functionally provided further shift element (A) is arranged axially on a side of the first planetary gear set (P1) facing away from the third planetary gear set (P3).

13. A motor vehicle transmission (2; 40; 44; 48) according to any one of claims 10 to 12, characterised in that At least the functionally provided third shift element (E) and at least the functionally provided fourth shift element (F) are arranged axially between the third planetary gear set (P3) and the second planetary gear set (P2).

14. A motor vehicle transmission (2; 40; 44; 48) according to claim 8 and any one of claims 10 to 13, characterized in that The additional shift element (D), which is provided at least functionally, is arranged axially between the third planetary gear set (P3) and the second planetary gear set (P2).

15. A drive unit (1; 39; 43; 47) for an at least partially electrically driven motor vehicle, the drive unit comprising a first electric machine (3), a second electric machine (4) and a motor vehicle transmission (2; 40; 44; 48) according to any one or more of claims 1 to 14, wherein: The rotor (7) of the first electric machine (3) is coupled to a first drive shaft (9) of the motor vehicle transmission (2; 40; 44; 48), and the rotor (8) of the second electric machine (4) is coupled to a second drive shaft (10) of the motor vehicle transmission (2; 40; 44; 48).

16. The drive unit (1; 39; 43; 47) according to claim 15, characterized in that The first planetary gear set (P1) of the motor vehicle transmission (2; 40; 44; 48) is arranged axially at least partially overlapping the rotor (7) of the first electric machine (3) and radially inside the rotor of the first electric machine.

17. Drive unit (1; 39; 43; 47) according to claim 15 or 16, characterized in that The third planetary gear set (P3) and / or the second planetary gear set (P2) of the motor vehicle transmission (2; 40; 44; 48) are arranged axially at least partially overlapping with the rotor (8) of the second electric machine (4) and radially inside the rotor of the second electric machine.

18. A motor vehicle drive axle (51) for a hybrid vehicle or an electric vehicle (49), comprising a drive unit (54) according to any one or more of claims 15 to 17.

19. A hybrid or electric vehicle (49) comprising at least one motor vehicle drive axle (54) according to claim 18 or at least one drive unit (1; 39; 43; 47) according to any one or more of claims 15 to 17.

20. Method for operating a motor vehicle transmission (2; 40; 44; 48) according to one or more of claims 1 to 14, - wherein a first transmission ratio (E1.1; E1.2') between the first drive shaft (9) and the output shaft (11) is switched by assuming an actuated state of the first shift element (B), - in, By assuming the actuated state of the second shift element (C), a second transmission ratio (E1.2; E1.3') is switched between the first drive shaft (9) and the output shaft (11), - wherein a first transmission ratio (E2.1; E2.2') between the second drive shaft (10) and the output shaft (11) is switched by assuming an actuated state of the third shift element (E), and - wherein a second transmission ratio (E2.2; E2.3') between the second drive shaft (10) and the output shaft (11) is switched by assuming an actuated state of the fourth shift element (F).

21. Method according to claim 20 for operating a motor vehicle transmission (40; 48) according to claim 4, characterized in that A further transmission ratio (E1.1′) between the first drive shaft (9) and the output shaft (11) is also switched by assuming an actuated state of a further shift element (A).

22. Method according to claim 20 or 21 for operating a motor vehicle transmission (44; 48) according to claim 8, characterized in that A further transmission ratio (E2.1′) between the second drive shaft (10) and the output shaft (11) is also switched by assuming an actuated state of the additional shift element (D).

23. The method according to any one of claims 20 to 22, characterized in that During a change from a transmission ratio acting between a drive shaft (9; 10) and an output shaft (11) to a further transmission ratio (G2) acting between the drive shaft (9; 10) and the output shaft (11), the traction force on the further drive shaft (10; 9) is supported by switching out the transmission ratio acting between the further drive shaft (10; 9) and the output shaft (11) at least during the change.

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