electric vehicle

Abstract

Electric vehicle, comprising a first electric machine (18) comprising a first stator (20) and a first rotor (22) arranged coaxially to a main axis of rotation (24), a second electric machine (28) comprising a second stator (30) and a second rotor (32) arranged coaxially to the main axis of rotation (24), a gearbox (34) arranged axially between the electric machines (18, 28) with respect to the main axis of rotation (24), and a power electronics unit (42) arranged at least partially axially overlapping the gearbox (34) and each at least partially axially overlapping the electric machines (18, 28). wherein the power electronics unit (42) is arranged at least partially in front of the electric machines (18, 28) in the longitudinal direction of the vehicle and overlapping the electric machines (18, 28) in the vertical direction of the vehicle, characterized by a transmission control unit (54) by means of which valves can be controlled, by means of which the supply of hydraulic fluid to switching elements (S1, S2, S3) of the transmission (34) and / or the discharge of hydraulic fluid from the switching elements (S1, S2, S3) can be influenced, wherein the transmission control unit (54) is integrated into the power electronics unit (42), wherein a heat exchanger (58) through which a first fluid and a second fluid different from the first fluid flow for tempering the first fluid is included, through which heat can be exchanged between the fluids, wherein the heat exchanger (58), which is formed separately from the power electronics unit (42), connects to the power electronics unit (42) in the transverse direction of the vehicle such that the heat exchanger (58) is arranged overlapping the power electronics unit (42) in the vertical and longitudinal directions of the vehicle, wherein the heat exchanger (58) is directly attached to the power electronics unit (42).

Description

[0001] The invention relates to an electric vehicle according to the preamble of claim 1.

[0002] DE 10 2022 201 086 A1 is an electric vehicle as known, comprising a vehicle body and an electric battery with high DC voltage, which is arranged within the vehicle body.

[0003] The generic DE 10 2022 003 150 A1 discloses an electric vehicle with a drive axle comprising two electric machines, a gearbox, and power electronics, wherein the power electronics are arranged axially overlapping the gearbox, axially overlapping each of the electric machines, and at least partially in front of the electric machines in the longitudinal direction of the vehicle and overlapping them in the vertical direction of the vehicle. A similar drive axle is disclosed in DE 10 2015 212 811 A1, wherein in this case the power electronics are arranged above the electric machines in the vertical direction of the vehicle.

[0004] DE 10 2019 203 730 A1 shows an electric drive train, also with two electric machines and a gearbox, including a gearbox control unit integrated into a power electronics unit.

[0005] DE 11 2019 004 892 T5 and DE 600 32 664 T2 each show a drive train with a heat exchanger for a lubricating oil.

[0006] The object of the present invention is to create an electric vehicle with a particularly space-saving arrangement of the components of the electric vehicle.

[0007] This problem is solved by an electric vehicle with the features of claim 1. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims.

[0008] The invention relates to a motor vehicle designed as an electric vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car, and is simply referred to as a vehicle. The electric vehicle, whose interior, also referred to as the passenger compartment, passenger cell, or cabin, is formed, for example, by a structure of the electric vehicle, in particular designed as a self-supporting body, comprises a first electric machine, which has a first stator and a first rotor. In particular, the first rotor can be driven by means of the first stator and is thereby rotatable about a first machine axis of rotation relative to the first stator. The electric vehicle also comprises a second electric machine, which has a second stator and a second rotor. In particular, the second rotor can be driven by means of the second stator and is thereby rotatable about a second machine axis of rotation relative to the second stator.The first rotor is arranged coaxially to a main axis of rotation, and the second rotor is also arranged coaxially to the main axis of rotation, so that the rotors, and thus the electrical machines, are arranged coaxially to each other. Therefore, the axes of rotation of the machines coincide, and the axes of rotation of the machines coincide with the main axis of rotation. The respective electrical machine whose axial direction coincides with the respective machine axis of rotation, and thus with the main axis of rotation, is also referred to as an electrical machine. The respective electrical machine whose radial direction is perpendicular to the main axis of rotation, and thus perpendicular to the axial direction of the respective electrical machine, is preferably a high-voltage component whose electrical voltage, in particular operating or rated voltage, is preferably greater than 50 volts, particularly greater than 60 volts, and most preferably several hundred volts.Preferably, the electric machines are components of an electric drive system of the electric vehicle, which can be driven, in particular purely electrically, by means of the electric axle drive. For example, the first electric machine can provide first drive torques via its first rotor for driving the vehicle, in particular purely electrically, and for example, the second electric machine can provide second drive torques via its second rotor for driving the vehicle, in particular purely electrically. The electric vehicle has, for example, at least or exactly two axles, also simply referred to as axles, arranged consecutively and thus one behind the other in the longitudinal direction of the electric vehicle, whose vertical direction is perpendicular to the longitudinal direction of the electric vehicle, namely a first axle and a second axle.Each vehicle axle has, for example, at least or exactly two wheels of the electric vehicle, which are also simply referred to as wheels. The vehicle's vertical direction is perpendicular to both its longitudinal and lateral directions. The wheels of each axle are located on opposite sides of the vehicle (electric vehicle) and thus, for example, of its body, in the opposite direction to each other. The wheels of the electric vehicle are ground contact elements, and the vehicle can be supported or rests against the ground via these ground contact elements.When the electric vehicle is driven along the ground, while in the upward direction of the vehicle is supported downwards by the ground contact elements, the ground contact elements roll along the ground, in particular directly. For example, the electric motors and thus the drive unit are assigned, in particular exactly, to one of the vehicle axles, so that at least or exactly two vehicle wheels of the vehicle axle to which the electric motors are assigned can be driven electrically by means of the electric motors.

[0009] For example, the main axis of rotation runs parallel to the vehicle's transverse direction.

[0010] The electric vehicle has a transmission arranged axially between the electric motors with respect to the main axis of rotation, that is, viewed along the main axis of rotation. This transmission allows, for example, the vehicle wheels of the axle to which the electric motors are assigned to be driven, particularly simultaneously, by the electric motors, i.e., by the rotors. In other words, the respective first and second drive torques can be transmitted from the rotors to the vehicle wheels of the axle to which the electric motors are assigned via the transmission. Unless otherwise specified, the term "vehicle axle" refers to the axle to which the electric motors are assigned.When vehicle wheels are mentioned below, unless otherwise specified, this refers to the vehicle wheels of the vehicle axle that are driven by the electric motors. Vehicle wheels are also referred to as drive wheels, driven wheels, or powered wheels.

[0011] The electric vehicle also features a power electronics unit, also known as an inverter. The power electronics unit is arranged with at least partial axial overlap with the transmission and also with at least partial axial overlap with the electric motors.

[0012] Within the scope of this disclosure, the feature "axially overlapping" is to be understood as follows: Two elements, such as the power electronics unit and the gearbox, are arranged axially overlapping with respect to a common axis, in particular in the axial direction of the respective electrical machine, whose respective radial direction is perpendicular to the respective axial direction of the respective machine and thus perpendicular to the main axis of rotation, if they are each arranged at least partially in a region of the same axial coordinates. Within the scope of this disclosure, the term "axial" is to be understood as the axial direction of the respective electrical machine. In other words, the term "axial" refers to the axial direction of the respective electrical machine.Put another way, “axial” refers to the axial direction of the respective electrical machine and thus to the main axis of rotation.

[0013] Within the scope of this disclosure, the feature "radially overlapping" is to be understood as follows: Two elements, in particular those that are at least substantially rotationally symmetrical, are arranged in a radially overlapping manner, especially with respect to a common axis, for example, an axis extending radially in the direction of the respective electrical machines and thus perpendicular to the main axis of rotation, and / or in a radially overlapping manner, particularly with respect to the radial axis of the respective electrical machine, if they are each arranged at least partially in a region of the same radial coordinates, in particular the same angular coordinates. The term "radial" refers to the radial direction of the respective electrical machine. In other words, the term "radial" means the radial direction of the respective electrical machine.When the radial direction is mentioned before and below, this refers, unless otherwise specified, to the respective radial direction of the respective electrical machine. In other words, "radial" thus refers to the respective radial direction of the respective electrical machine. When the axial direction is mentioned before and below, this refers, unless otherwise specified, to the axial direction of the respective electrical machine.

[0014] The electric motors, the transmission and the power electronics unit are components of the electric vehicle or are also referred to as components of the electric vehicle.

[0015] To achieve a particularly space-saving arrangement of the components and thus a particularly space-saving, and therefore compact, design of the drive unit, the power electronics unit is arranged in a known manner in the longitudinal direction of the vehicle, i.e., in front of the electric motors. Furthermore, the power electronics unit is arranged in a known manner in the vertical direction of the vehicle, i.e., overlapping the electric motors in the vertical direction of the vehicle. Thus, it is preferably provided that the electric motors are at least partially, and in particular at least predominantly, and therefore at least more than halfway or completely, covered by the electronics unit in the longitudinal direction of the electric vehicle.Furthermore, it is preferably provided that the transmission is at least partially, in particular at least predominantly and thus at least more than half or completely, overlapped by the power electronics unit in the longitudinal direction of the electric vehicle towards the front.

[0016] Within the scope of the present disclosure, "overlapping" shall be understood as follows: Two components are arranged overlapping with respect to the axial direction and / or the vehicle's vertical direction and / or the vehicle's longitudinal direction and / or the vehicle's transverse direction, i.e., with respect to each other, if the components are arranged in an area of ​​the same coordinates with respect to a coordinate axis that is arranged in the axial direction and / or in the vehicle's vertical direction and / or in the vehicle's longitudinal direction and / or in the vehicle's transverse direction and in particular that is straight.

[0017] Within the scope of this disclosure, the feature that two components are rotationally fixed to one another is understood to mean that the components connected in a rotationally fixed manner are arranged coaxially to one another and, in particular when the components are driven, rotate together or simultaneously about a common axis of rotation of the components, such as the main axis of rotation, at the same angular velocity, especially relative to a reference element such as a housing. In other words, two components are rotationally fixed to one another if they are arranged coaxially to one another, especially with respect to their axis of rotation and / or with respect to a rotational axis of symmetry, and if they are connected to one another in such a way that they always rotate at the same angular velocity. An component is rotationally fixed to the housing if it cannot be rotated relative to the housing.In other words, "rotationally fixed" means the following: Two elements that are rotatable with each other are rotationally fixed if they are arranged coaxially and are connected in such a way that they rotate, in particular always, with the same angular velocity, especially relative to the reference element.

[0018] For example, the electric vehicle has an electrical energy storage device in which electrical energy, particularly electrochemical energy, is stored or can be stored. For example, the electric machines can be supplied with the electrical energy stored or to be stored in the energy storage device via the power electronics unit, which is common to the electric machines, thereby enabling the electric machines to be operated in motor mode and thus as an electric motor. Thus, the power electronics unit, which is also simply referred to as power electronics, is or comprises, for example, a dual inverter through which the electric machines can be supplied with electrical energy. Compared to conventional solutions, the invention enables an optimized, space-saving arrangement of the components as well as the utilization of synergistic effects.The power electronics unit can, for example, be positioned transversely to the electric motors in front of them. Compared to conventional solutions, this can create free installation space in which, for example, at least one component can be arranged and / or at least one additional function can be implemented. Overall, the invention enables a particularly high line and function density of the drive unit as well as a very compact design.

[0019] According to the invention, the electric vehicle comprises a transmission control unit, which is advantageously an electronic computing device by means of which, for example, valves and pumps can be controlled. The supply of hydraulic fluid to the transmission's switching elements can be controlled by means of the valves. Alternatively or additionally, the flow of hydraulic fluid from the switching elements can be controlled by means of the valves. The hydraulic fluid is, for example, an oil. In other words, the flow of hydraulic fluid towards the switching elements can be controlled, for example, by means of the valves. Alternatively or additionally, the flow of hydraulic fluid away from the switching elements can be controlled, for example, by means of the valves. The switching elements can be, for example, clutches and / or brakes.For example, at least or exactly one of the switching elements is designed as a friction clutch, in particular as a multi-plate clutch. Alternatively or additionally, at least or exactly one of the switching elements is designed as a positive-locking clutch, in particular as a jaw clutch. The switching elements can be actuated by means of the hydraulic fluid.

[0020] The transmission control unit is another component which is arranged in a particularly space-saving manner thanks to the invention.

[0021] The valves and pumps are advantageously hydraulic components that are particularly advantageously arranged together in a hydraulic unit, i.e., in a single assembly. Here, the assembly refers to a complete set of essential electro-hydraulic elements that are connected to the transmission control unit and can be controlled by it.

[0022] In order to achieve a particularly compact design of the drive unit, it is further provided according to the invention that the transmission control unit is integrated into the power electronics unit.

[0023] Furthermore, according to the invention, a heat exchanger is provided, in particular arranged outside the transmission and outside the electrical machines, wherein the transmission and the electrical machines are preferably arranged outside the heat exchanger. The heat exchanger is permeable to a first fluid, preferably a liquid, and a second fluid, preferably a liquid, which is different from the first fluid. Heat can be exchanged between the fluids via the heat exchanger, whereby the first fluid can be tempered, i.e., cooled and / or heated. For example, if the first fluid has a lower temperature as it passes through the heat exchanger than the second fluid as it passes through the heat exchanger, heat can be transferred from the second fluid to the first fluid, thereby heating the first fluid and cooling the second fluid.For example, if the first fluid has a higher temperature as it passes through the heat exchanger than the second fluid as it passes through the same heat exchanger, then the first fluid can be cooled and the second fluid can be heated. The heat exchanger is another component of the electric vehicle.

[0024] Furthermore, according to the invention, the heat exchanger, which is designed separately from the power electronics unit, connects to the power electronics unit in the transverse direction of the vehicle in such a way that, viewed in the vehicle's vertical and longitudinal directions, the heat exchanger is arranged overlapping the power electronics unit. Thus, for example, the power electronics unit is at least partially overlapped by the heat exchanger in the first or second direction when viewed in the transverse direction of the vehicle. This allows for a particularly space-saving design.

[0025] Finally, according to the invention, the heat exchanger is attached directly to the power electronics unit, in particular by screwing the heat exchanger onto the power electronics unit.

[0026] In order to achieve a particularly compact design of the drive unit, in one embodiment of the invention it is provided that the power electronics unit is arranged partially radially overlapping with the electric machines, in particular such that the power electronics unit is partially overlapped by the first electric machine in a first direction running parallel to the transverse direction of the electric vehicle and pointing outwards from the power electronics unit, and partially overlapped by the second electric machine in a second direction running parallel to the transverse direction of the electric vehicle, opposite to the first direction and pointing outwards from the power electronics unit.

[0027] Another embodiment is characterized in that a component unit comprising the valves and / or a filter for filtering the hydraulic fluid is arranged overlapping the transmission in both the longitudinal and transverse directions of the vehicle, such that, for example, the transmission is at least partially, and in particular at least predominantly, and thus at least more than halfway or completely, overlapped (i.e., covered) by the component unit in the vertical direction of the vehicle. The component unit is a further component of the electric vehicle, and a particularly space-saving arrangement of the components can be demonstrated.

[0028] The first fluid is, for example, the hydraulic fluid and / or a fluid for lubricating and / or cooling the transmission. For example, the first fluid is the aforementioned oil.

[0029] In order to achieve a particularly compact design, a further, alternative embodiment, which is not according to the invention, provides that the heat exchanger, which is designed separately from the power electronics unit, connects to the transmission upwards in the vehicle's vertical direction in such a way that, viewed in both the longitudinal and transverse directions of the vehicle, the heat exchanger is arranged overlapping the transmission. This means that, for example, in the vehicle's vertical direction, the transmission is at least partially, and in particular at least predominantly or completely, overlapped by the heat exchanger.

[0030] Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing.

[0031] The drawing shows in: Fig. 1 a schematic and cutaway front view of a first embodiment of an electric drive device of an electric vehicle; Fig. 2 a schematic side view of the first embodiment; Fig. 3 a schematic and cutaway top view of the first embodiment; Fig. 4 a schematic and cutaway front view of a second embodiment of the drive device not falling under claim 1; Fig. 5 a schematic side view of the second embodiment; and Fig. 6 A schematic and cutaway top view of the second embodiment.

[0032] In the figures, identical or functionally equivalent elements are provided with the same reference symbols.

[0033] Fig. Figure 1 shows a schematic, cutaway front view of a first embodiment of an electric drive unit 10 of an electric vehicle, also referred to simply as a vehicle, whose longitudinal direction is also simply referred to as the longitudinal direction. This means that the electric vehicle, whose transverse direction is also simply referred to as the transverse direction and is perpendicular to the longitudinal direction, has the electric drive unit 10 and can be driven electrically, in particular purely, by means of the electric drive unit 10. For example, the electric vehicle, whose vertical direction is also simply referred to as the vertical direction and is perpendicular to both the longitudinal and transverse directions, has exactly two axles arranged consecutively in the longitudinal direction, namely a first axle and a second axle.Each vehicle axle has exactly 10 wheels of the electric vehicle. The wheels of each axle are arranged on opposite sides of the electric vehicle in the transverse direction. The interior of the electric vehicle, also referred to as the passenger compartment, passenger cell, or cabin, is formed by a structure designed, for example, as a self-supporting body. For example, two of the wheels of the electric vehicle, in particular, can be driven electrically by means of the electric drive unit 10, and preferably the wheels driven by means of the electric drive unit 10, also referred to as drive wheels, are the wheels of the same axle, and thus, for example, of the first axle. The transverse direction of the electric vehicle, which is preferably designed as a motor vehicle, in particular a passenger vehicle, is illustrated by a double arrow 12.The vertical direction of the electric vehicle is illustrated by a double arrow 14 and runs perpendicular to the vehicle's transverse direction. The longitudinal direction of the electric vehicle is illustrated by a double arrow 16 and runs perpendicular to the image plane. Fig. 1, perpendicular to the vehicle's transverse direction and perpendicular to the vehicle's vertical direction. The electric drive unit 10, and thus the electric vehicle, comprises a first electric machine 18, which has a first stator 20 and a first rotor 22. The rotor 22 can be driven by means of the stator 20 and is thereby rotatable about a main axis of rotation 24 of the drive unit 10, the axial direction of which coincides with the main axis of rotation 24, relative to the stator 20. The drive unit 10, whose radial direction is perpendicular to the axial direction of the drive unit 10 and thus perpendicular to the main axis of rotation 24, also has a housing 26. The stator 20 is arranged in the housing 26. The rotor 22 is also arranged in the housing 26.The first electric machine 18, whose axial direction coincides with the axial direction of the drive unit 10 and thus with the main axis of rotation 24, can provide initial drive torques for driving the drive wheels via its rotor 22. The first electric machine 18, whose radial direction is perpendicular to the radial direction of the electric machine 18 and thus of the drive unit 10, is here designed as a first axial flux machine.

[0034] The drive unit 10, and thus the electric vehicle, comprises a second electric machine 28, the axial direction of which coincides with the axial direction of the first electric machine 18, and thus of the drive unit 10, and with the main axis of rotation 24. The electric machine 28, whose radial direction is perpendicular to the axial direction of the electric machine 28 and thus perpendicular to the main axis of rotation 24, comprises a second stator 30 and a second rotor 32, which can be driven by means of the stator 30 and is therefore rotatable about the main axis of rotation 24 relative to the stator 30 and also relative to the housing 26. The rotor 32 and the stator 30 are arranged in the housing 26. The electric machine 28 is designed as a second axial flux machine. Via its rotor 32, the electric machine 28 can provide second drive torques for driving the drive wheels and thus the vehicle.It can be seen that the rotors 22 and 32 are arranged coaxially to the main axis of rotation 24 and thus coaxially to each other.

[0035] The drive unit 10, and thus the electric vehicle, has a transmission 34, which is arranged, for example, at least partially, in particular at least predominantly and thus at least more than halfway, or even completely, in a so-called gear set 36. When the radial direction is mentioned before and below, this refers, unless otherwise specified, to the radial direction of the drive unit 10 and thus of the respective electric machine 18, 28. When the axial direction is mentioned before and below, this refers, unless otherwise specified, to the axial direction of the drive unit 10 and thus of the electric machines 18 and 28. The term "axial" means the axial direction, and the term "radial" means the radial direction.The transmission 34 is arranged axially between the electric machines 18 and 28 with respect to the main axis of rotation 24, i.e., viewed along the main axis of rotation 24, such that the transmission 34 is at least partially, in particular at least predominantly or completely, covered, i.e., overlapped, by the electric machine 18 in a first direction illustrated by arrow 38, and in a second direction opposite to the first direction and illustrated by arrow 40, at least partially, in particular at least predominantly or completely, covered, i.e., overlapped, by the electric machine 28. The first direction runs parallel to the transverse direction of the vehicle and outwards from the transmission 34. The second direction runs parallel to the transverse direction of the vehicle and outwards from the transmission 34.

[0036] The drive unit 10, and thus the electric vehicle, also includes a power electronics unit 42, which consists of Fig. 2 is recognizable and is also simply referred to as power electronics. The power electronics unit 42 is or comprises, for example, at least one inverter. For example, the respective electric machine 18, 28 can be supplied with electrical energy via the power electronics, which is to be stored, for example, in an electrical energy storage device of the motor vehicle, in particular electrochemically. The power electronics unit 42 is arranged at least partially axially overlapping the transmission 34, in this case such that the transmission 34 is at least partially, in particular at least predominantly or completely, overlapped, i.e., covered, by the power electronics unit 42 in the longitudinal direction of the vehicle towards the front. As can be seen from Fig. 2 and Fig. As can be seen in Figure 3, the power electronics unit 42 is also arranged at least partially axially overlapping with the electrical machines 18 and 28.

[0037] In order to achieve a particularly space-saving design for the drive unit 10, it is provided that the power electronics unit 42 is arranged at least partially, and in particular at least predominantly or completely, in front of the electric motors 18 and 28 in the longitudinal direction of the electric vehicle. As further evidenced by Fig. As can be seen in Figure 2, the power electronics unit 42 is arranged in the vehicle's vertical direction, i.e., overlapping the electric machines 18 and 28 with respect to the vehicle's vertical direction, so that in the first embodiment the electric machines 18 and 28 are each at least partially, in particular at least predominantly and thus at least more than half or completely, covered by the power electronics unit 42 in the longitudinal direction forwards, i.e. overlapped. Fig. Figure 2 illustrates a forward direction of travel, also simply referred to as the direction of travel, which runs parallel to or coincides with the longitudinal direction of the vehicle, with the direction of travel pointing forward in the longitudinal direction of the vehicle. In particular, when traveling straight ahead in the longitudinal direction of the vehicle, the electric vehicle travels in the direction of travel and thus forwards.

[0038] In the first embodiment, the transmission 34, in particular its entirety, is arranged coaxially with the electric machines 18 and 28. In the first embodiment, the transmission 34 has a differential gear 46, also referred to simply as a differential, which in the first embodiment is designed as a planetary differential. The planetary differential has a ring gear 48 as a differential input shaft, which is rotatable about the main axis of rotation 24 relative to the housing 26. The planetary differential has a planet carrier 50, which is designed as a double planet carrier. The planet carrier 50 is a first differential output shaft of the differential gear 46. The planetary differential also has a sun gear 52 as a second differential output shaft of the differential gear 46. The respective differential output shaft is rotatable about the main axis of rotation 24 relative to the housing 26. The ring gear 48 can be driven by the rotor 22.In the first embodiment, the rotor 22 is permanently connected to the ring gear 48 in a torque-transmitting manner, in the present case such that the rotor 22 is permanently connected to the ring gear 48 in a rotationally fixed manner.

[0039] In the first embodiment, the transmission 34 has at least, or in this case exactly, three switching elements: a first switching element S1, a second switching element S2, and a third switching element S3. The switching elements S1, S2, and S3 are clutches of the transmission 34. For example, switching element S1 is a positive-locking clutch, in particular a jaw clutch. Switching element S2 is, for example, a friction clutch, in particular a multi-plate clutch. Switching element S3 is, for example, a friction clutch, in particular a multi-plate clutch. Switching element S2 has a first input element E1, and switching element S3 has a second input element E2. The input elements E1 and E2 are, for example, in particular permanently, torque-transmitting, and in particular rotationally fixed, to each other. By means of switching element S1, the rotor 32 can be connected, in particular simultaneously, to the input elements E1 and E2 in a rotationally fixed manner.The input element E1 can be connected to the sun gear 52 in a rotationally fixed manner by means of the switching element S2. The input element E2 can be connected to the planet carrier 50 in a rotationally fixed manner by means of the switching element S3. If the switching elements S1 and S2 are closed, particularly simultaneously, especially while the switching element S3 is open, then the rotor 32 is connected to the sun gear 52 in a rotationally fixed manner via the switching elements S1 and S2. If the switching elements S1 and S3 are closed, particularly simultaneously, especially while the switching element S2 is open, then the rotor 32 is connected to the planet carrier 50 in a rotationally fixed manner via the switching elements S1 and S3. If the switching element S1 is open, the rotor 32 is decoupled from the input elements E1 and E2, so that no torques can be transmitted between the respective input elements E1, E2 and the rotor 32 and the rotor 32 can be rotated about the main axis of rotation 24 relative to the input element E1 and relative to the input element E2.

[0040] Out of Fig. Figure 3 shows that in the first embodiment, the power electronics unit 42 is arranged to partially radially overlap the electric machines 18 and 28, such that the power electronics unit 42 is partially overlapped, i.e., covered, by the electric machine 18 in the first direction illustrated by arrow 38 and by the electric machine 28 in the second direction illustrated by arrow 40. Furthermore, the electric machines 18 and 28 are each at least partially overlapped by the power electronics unit 42 around the transmission 34 in the longitudinal direction forward of the vehicle.

[0041] The drive unit 10, and thus the electric vehicle, has a transmission control unit 54, also referred to simply as a control unit, which is an electronic computing device. The switching elements S1, S2, and S3 can be actuated by means of a hydraulic fluid and can therefore be switched, for example, between a closed state and an open state. Preferably, the hydraulic fluid is an oil. The drive unit 10, and thus the electric vehicle, has valves, which are not shown in detail in the figures. The supply of hydraulic fluid to the switching elements S1, S2, and S3 can be controlled by means of the valves, so that, for example, the flow of hydraulic fluid to the switching elements S1, S2, and S3 can be controlled by means of the valves.Alternatively or additionally, the valves can be used, for example, to control the flow of hydraulic fluid away from the switching elements S1, S2, and S3, thus allowing the flow of hydraulic fluid away from these elements. The transmission control unit 54 can be used to control the valves, particularly electrically, in order to influence the flow of hydraulic fluid towards and / or away from the switching elements S1, S2, and S3. This can be seen from... Fig. 1 to 3 is that in the first embodiment the transmission control unit 54 is integrated into the power electronics unit 42.

[0042] The drive unit 10, and thus the electric vehicle, also includes a component 56, which, for example, contains the valves. Furthermore, component 56 includes, for example, a filter for filtering the hydraulic fluid. As shown in the diagram... Fig. As can be seen in Figure 1, the assembly 56 is arranged axially overlapping the transmission 34 and radially overlapping the electric machines 18 and 28. Furthermore, the assembly 56 is arranged to overlap the transmission 34 in both the longitudinal and transverse directions of the vehicle. Thus, the transmission 34 is at least partially overlapped downwards by the assembly 56 in the vertical direction of the vehicle. Additionally, the assembly 56 is at least partially overlapped by the electric machine 18 in the first direction (arrow 38) and at least partially overlapped by the electric machine 28 in the second direction (arrow 40).

[0043] The assembly unit 56 is a hydraulic device of the electric drive unit 10. In this exemplary embodiment, the assembly unit 56 advantageously includes a hydraulic oil sump in addition to the aforementioned hydraulic components.

[0044] The drive unit 10, and thus the electric vehicle, also includes a heat exchanger 58 through which a first fluid and a second fluid, different from the first fluid, can flow for temperature control of the first fluid. Preferably, the first fluid is the aforementioned hydraulic fluid. Alternatively or additionally, the first fluid is a fluid for lubricating and / or cooling the transmission 34. Thus, for example, the first fluid is the aforementioned oil or another oil. The second fluid is, or comprises, for example, water, so that, for example, the heat exchanger 58 is designed as an oil-water heat exchanger. Heat can be exchanged between the fluids via the heat exchanger 58.

[0045] Out of Fig. Figure 3 shows that in the first embodiment, the heat exchanger 58, which is designed separately from the power electronics unit 42, connects to the power electronics unit 42 in the transverse direction of the vehicle and, in this case, in the first direction, such that the heat exchanger 58 overlaps the power electronics unit 42 when viewed in the vertical and longitudinal directions of the vehicle. Thus, in this case, the power electronics unit 42 is at least partially overlapped by the heat exchanger 58 in the first direction.

[0046] Fig.Figures 4 to 6 show a second embodiment of the drive unit 10 not covered by claim 1. In the second embodiment, the heat exchanger 58, which is separate from the power electronics unit 42, connects to the transmission 34 upwards in the vehicle's vertical direction such that, viewed in both the longitudinal and transverse directions of the vehicle, the heat exchanger 58 overlaps the transmission 34. Thus, in the second embodiment, the transmission 34 is at least partially overlapped by the heat exchanger 58 upwards in the vehicle's vertical direction. Reference symbol list 10 electric drive unit 12 Double Arrow 14 Double Arrow 16 Double Arrow 18 first electric machine 20 first stator 22 first rotor 24 Main axis of rotation 26 cases 28 second electric machine 30 second stator 32 second rotor 34 gearboxes 36 Wheelset installation space 38 Arrow 40 Arrow 42 Power electronics unit 44 Arrow 46 Differential gears 48 Ring gear 50 planetary carriers 52 Sun wheel 54 Transmission control unit 56 building units 58 heat exchangers S1 switching element S2 switching element S3 switching element

Claims

[1] Electric vehicle, comprising a first electric machine (18) comprising a first stator (20) and a first rotor (22) arranged coaxially to a main axis of rotation (24), a second electric machine (28) comprising a second stator (30) and a second rotor (32) arranged coaxially to the main axis of rotation (24), a gearbox (34) arranged axially between the electric machines (18, 28) with respect to the main axis of rotation (24), and a power electronics unit (42) arranged at least partially axially overlapping the gearbox (34) and each at least partially axially overlapping the electric machines (18, 28), wherein the power electronics unit (42) is arranged at least partially in front of the electric machines (18, 28) in the longitudinal direction of the vehicle and overlapping the electric machines (18, 28) in the vertical direction of the vehicle, characterized by a transmission control unit (54) by means of which valves can be controlled, by means of which the supply of hydraulic fluid to switching elements (S1, S2, S3) of the transmission (34) and / or the discharge of hydraulic fluid from the switching elements (S1, S2, S3) can be influenced, wherein the transmission control unit (54) is integrated into the power electronics unit (42), wherein a heat exchanger (58) through which a first fluid and a second fluid different from the first fluid flow for tempering the first fluid is included, through which heat can be exchanged between the fluids, wherein the heat exchanger (58), which is formed separately from the power electronics unit (42), connects to the power electronics unit (42) in the transverse direction of the vehicle such that the heat exchanger (58) is arranged overlapping the power electronics unit (42) in the vertical and longitudinal directions of the vehicle, wherein the heat exchanger (58) is directly attached to the power electronics unit (42). [2] Electric vehicle according to claim 1, characterized by , that the power electronics unit (42) is arranged partially radially overlapping with the electrical machines (18, 28). [3] Electric vehicle according to claim 1 or 2, characterized by , that a component (56) comprising the valves and / or a filter for filtering the hydraulic fluid is arranged overlapping the transmission (34) in the longitudinal direction and in the transverse direction of the vehicle. [4] Electric vehicle according to any one of the preceding claims, characterized by that the first fluid is the hydraulic fluid and / or a fluid for lubricating and / or cooling the gearbox.

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