Drive train for working machine and working machine

Abstract

The invention relates to a drive train (1) for a working machine, wherein the drive train (1) comprises: a first electric motor (2), the first electric motor having a first drive shaft (3) which can be driven by the first electric motor (2); and a second electric motor (4), the second electric motor having a second drive shaft (5) which can be driven by the second electric motor (4). The drive train (1) according to the invention is characterized in that a first coupling wheel (6) is arranged on the first drive shaft (3), and a second coupling wheel (7) is arranged on the second drive shaft (5), wherein the first coupling wheel (6) meshes with the second coupling wheel (7). The invention also relates to a corresponding working machine.

Description

Technical Field

[0001] The invention relates to a drive train for a working machine and to a corresponding working machine. Background Art

[0002] In the prior art, electrically driven working machines such as wheel loaders, dump trucks or agricultural tractors are known. Such working machines are either purely electrically driven, that is to say their energy supply consists exclusively of batteries or accumulators which provide the electrical energy required by one or more electric motors. Or they are diesel-electric, which means that the required electrical energy is provided by a diesel-driven generator and possibly an electrical buffer store, such as capacitors or rechargeable batteries of corresponding size. In both cases, the mechanical power required for the driving and working operations is generated by one or more electric motors.

[0003] In this regard, the applicant knows a purely electrically driven agricultural working machine named "Fendt e100", which is driven by a single central drive configured as an electric motor. The driving power of the central drive can be transmitted to each wheel via a power split transmission as required.

[0004] Furthermore, the applicant knows a diesel-electric agricultural working machine called "Rigitrac EWD120", which comprises a diesel-driven generator for providing electrical power and four electric single wheel drives integrated into the wheel rims and configured as wheel hub drives. The electrical power generated by the generator is supplied to the wheel hub drives. The single wheel drives enable individual control and regulation of the driven wheels. Furthermore, the "Rigitrac EWD120" has a braking resistor, which represents an electrical load in the generator operation of the electric motor, which loads and brakes the electric motor.

[0005] DE 20 2014 000 738 U1 describes a wheel loader driven purely by an electric motor, which has a first electric motor for driving operation and a second electric motor for working operation.

[0006] Known electrically driven working machines have not yet fully exploited the advantages that the electric drive concept can bring. Summary of the invention

[0007] The object of the present invention is to provide an improved drive train for a working machine.

[0008] According to the invention, this object is achieved by a drive assembly according to the invention for a working machine.

[0009] The present invention relates to a drive train for a working machine, wherein the drive train comprises: a first electric motor having a first drive shaft that can be driven by the first electric motor; and a second electric motor having a second drive shaft that can be driven by the second electric motor. The drive train according to the present invention is characterized in that a first coupling wheel is arranged on the first drive shaft, and a second coupling wheel is arranged on the second drive shaft, wherein the first coupling wheel meshes with the second coupling wheel.

[0010] According to the invention, a drive train is provided with two electric motors that can be operated independently of each other, i.e., a drive train with a first electric motor and a second electric motor. Here, a first drive shaft that can be driven by the first electric motor is assigned to the first electric motor, and a second drive shaft that can be driven by the second electric motor is assigned to the second electric motor. The first or second drive shaft can either be formed integrally with the respective motor shafts of the first and second electric motors, i.e., be identical to the respective motor shafts, or can be independent components that are only connected in driving manner to the first electric motor or the second electric motor, for example, via a step-up ratio or a step-down ratio. A coupling wheel, i.e., a first coupling wheel or a second coupling wheel, is provided on the first drive shaft and the second drive shaft, respectively, wherein the first coupling wheel meshes with the second coupling wheel. The first coupling wheel or the second coupling wheel is advantageously a spur gear. The first coupling wheel and the second coupling wheel can be selectively configured to be identical, i.e., to keep the transmitted rotational speed unchanged, or they can be configured as a step-up ratio or a step-down ratio and increase or decrease the transmitted rotational speed accordingly.

[0011] The advantage resulting from this is that the drive power or torque from the first electric motor can be transmitted to the second drive shaft, and the drive power or torque from the second electric motor can also be transmitted to the first drive shaft. This in turn makes possible the so-called downsizing of the first electric motor and the second electric motor, because if there is a power demand for one of the two electric motors that cannot be provided by the respective associated electric motor or can only be provided under unfavorable conditions, such as low efficiency, the two can support each other in terms of drive technology. Downsizing also allows the weight, installation space and provision costs of the first electric motor and the second electric motor to be reduced.

[0012] It is conceivable and preferred here to provide not only a single first electric motor and a single second electric motor, but also a plurality of first electric motors or a plurality of second electric motors which can be coupled to one another, for example, in each case via a summing gear.

[0013] According to a preferred embodiment of the present invention, the first coupling wheel is fixedly connected to the first drive shaft in a transmission manner, the second coupling wheel is configured as an idler wheel and can be connected to the second drive shaft in a transmission manner by means of a coupling element, a first clutch for interrupting the power flow on the first drive shaft is connected in a transmission manner behind the first coupling wheel, and a second clutch for interrupting the power flow on the second drive shaft is connected in a transmission manner behind the second coupling wheel. The advantage obtained by this is that a relatively simple and thus inexpensive construction form of the drive train according to the present invention is provided. In the state where the second coupling wheel is connected in a transmission manner to the second drive shaft, power or torque can be transmitted from the first drive shaft to the second drive shaft, or vice versa. When the first clutch is disengaged and the second clutch is engaged, that is, when the power flow on the first drive shaft is interrupted from the first clutch, the full power or full torque of the first electric motor can be provided to the second drive shaft. Conversely, when the second clutch is disengaged and the first clutch is engaged, that is, when the power flow on the second drive shaft is interrupted from the second clutch, the full power or full torque of the second electric motor can be provided to the first drive shaft. It is also conceivable and preferred that the first clutch is fully engaged and the second clutch is partially engaged, so that the second clutch can only transmit a limited torque, or vice versa.

[0014] The first coupling wheel is advantageously designed as a fixed wheel.

[0015] The first clutch and the second clutch are preferably designed as multi-disk clutches.

[0016] According to another preferred embodiment of the present invention, a planetary gear set is arranged on the first drive shaft, wherein the first input end of the planetary gear set is connected to the first coupling wheel in a driving manner, and wherein the second input end of the planetary gear set is connected to the first drive shaft in a driving manner. This has the advantage that power or torque can be transmitted from the first drive shaft to the second drive shaft, or vice versa, wherein at the same time, the structure of the drive train is relatively simple and cost-effective.

[0017] In the sense of the present invention, the statement “a planetary transmission group is arranged on the first drive shaft” is understood to mean that the planetary transmission group up-converts or down-converts the torque introduced into the first drive shaft by the first electric motor and possibly by the second electric motor, and then transmits it to the output shaft of the planetary transmission group, which is an axial extension of the first drive shaft.

[0018] According to a particularly preferred embodiment of the present invention, the first input end is configured as a planet carrier, wherein the planet carrier is connected to the first coupling wheel in a rotationally fixed manner, and the second input end is configured as a sun wheel, wherein the sun wheel is connected to the first drive shaft in a rotationally fixed manner. This means that the rotational speed of the first drive shaft corresponds equally to the rotational speed of the sun wheel, and the rotational speed of the first coupling wheel corresponds equally to the rotational speed of the planet carrier. In this case, the first coupling wheel is preferably an idler wheel. The advantage obtained thereby is that the first drive shaft and the second drive shaft are connected to each other in a transmission manner via a planetary transmission device group, and at the same time, an upward conversion or downward conversion of the torque and the rotational speed is performed via the planetary transmission device group, so that the first drive shaft can be provided for a first application purpose, and the second drive shaft can be provided for a second application purpose.

[0019] According to another particularly preferred embodiment of the present invention, the second coupling wheel is configured as an idler wheel, wherein the second coupling wheel can be locked by means of a locking device, and can be connected to the second drive shaft in a transmission manner by means of a coupling element. The advantage obtained thereby is that an average power split from the first drive shaft to the second drive shaft, especially in combination with a planetary transmission group, and vice versa can be achieved. For this reason, the coupling element is engaged, and the locking device is disconnected. In this switching state, the second coupling wheel is connected to the second drive shaft in a rotationally resistant manner, so that there is a transmission connection between the first drive shaft and the second drive shaft. And when the locking device is engaged and the coupling element is disconnected, the first drive shaft is driven only by the first electric motor, and the second drive shaft is driven only by the second electric motor.

[0020] The locking device is preferably designed as a brake, for example as a diaphragm brake.

[0021] The coupling element is preferably designed as a clutch, for example a multi-disk clutch or a dog clutch.

[0022] According to another particularly preferred embodiment of the present invention, it is provided that the third electric motor is connected to the output end of the planetary gear set in a transmission manner. The advantage obtained thereby is that further miniaturization of the first electric motor and the second electric motor, but in particular the first electric motor, can be achieved. This further miniaturization can achieve a further reduction in the weight and structural space of the first electric motor and the second electric motor, but in particular the first electric motor. When the power or torque of the first electric motor or the second electric motor, but in particular only the first electric motor, does not meet the existing power or torque requirements, or when the existing power or torque requirements can only be provided by the first electric motor or by the second electric motor, but in particular only by the first electric motor only in an inefficient operating point, the third electric motor can, for example, always transmit additional power or torque to the output end of the planetary gear set.

[0023] According to a further preferred embodiment of the invention, it is provided that the first electric motor is assigned to the traction drive and the second electric motor is assigned to the auxiliary drive. This assignment of the first electric motor to the second electric motor has proven to be very suitable.

[0024] According to a particularly preferred embodiment of the present invention, the auxiliary drive comprises a mechanical power take-off shaft drive and a hydraulic pump drive. Therefore, the auxiliary drive can be used in a variety of ways and can realize the operation of different machines that can also be driven mechanically or hydraulically.

[0025] According to a particularly preferred embodiment of the invention, it is provided that the auxiliary drive comprises a power-shiftable auxiliary drive transmission. This leads to an increased flexibility of the auxiliary drive and thus of the drive train according to the invention.

[0026] According to a further particularly preferred embodiment of the invention, it is provided that the traction drive comprises a power-shiftable traction drive transmission. This leads to a corresponding increase in the flexibility of the traction drive transmission and thus also to an increase in the flexibility of the drive train according to the invention.

[0027] According to another preferred embodiment of the present invention, the first electric motor and the second electric motor are arranged in a common housing. This enables a space-saving and weight-saving arrangement of the first electric motor and the second electric motor within the drive train. In addition, the common housing can save weight and costs compared to two individual housings. For example, the first and second electric motors can be established axially one after the other in a common housing, wherein the motor shafts can, for example, point in opposite axial directions out of the housing. However, it is also possible and preferred to arrange them axially side by side in a correspondingly constructed housing so that the two motor shafts can, for example, point in the same axial direction. Advantages are also obtained in terms of the cost required for vibration reduction, because it is not necessary to separately suspend the two individual housings for vibration reduction.

[0028] If necessary, a third electric motor can also be arranged in the common housing.

[0029] Furthermore, it is preferably provided that the common housing comprises a common cooling and / or lubrication circuit for the first electric motor and the second electric motor. Compared to providing two separate cooling or lubrication circuits for the first electric motor and the second electric motor, this again reduces the installation space requirement and, in particular, reduces the manufacturing costs, since, for example, a common transfer pump, a common radiator and a common oil filter can be used. For example, the common housing can also include a common oil sump.

[0030] For example, oil can be used equally as coolant and lubricant, wherein cooling can be performed in particular via oil mist. If the cooling circuit and the lubrication circuit are designed independently of one another, water can also be used for the cooling circuit instead of oil, for example. In the latter case, it is preferred that the oil circuit and the lubrication circuit are independent of one another but are provided jointly for the first electric motor and the second electric motor, that is, a common lubrication circuit, for example based on oil, is provided for the first electric motor and the second electric motor, and a common cooling circuit, for example based on water, is provided for the first electric motor and the second electric motor, independent of the lubrication circuit.

[0031] Furthermore, it is preferred that each electric motor, that is to say the first, second and possibly third electric motor, is provided with its own power electronics for controlling or regulating the respective electric motor. If more than just the first, second or possibly third electric motor is provided, all first, second and third electric motors can also each have a common power electronics, wherein in this case the power electronics consists of two or possibly three separate electronics modules which can be arranged in a common housing and have, for example, a common power supply and a common heat sink.

[0032] According to another preferred embodiment of the present invention, it is provided that the first electric motor and the second electric motor are constructed in the same structure. This means that the first electric motor and the second electric motor are constructed in the same structure and can be interchanged with each other. The advantage obtained by this structural similarity is that only a single electric motor needs to be developed to replace two different electric motors. Similarly, only machine tools and manufacturing equipment for electric motors of one construction type need to be purchased. Since the development costs and acquisition costs of machine tools and manufacturing equipment are usually included in the sales price of the electric motor, a cost advantage is obtained compared to using two different electric motors as the first electric motor and the second electric motor via the so-called piece quantity effect.

[0033] It is preferably provided that the third electric motor is also designed to be structurally identical to the first electric motor and the second electric motor.

[0034] Preferably, the auxiliary drive transmission that may be present and the travel drive transmission that may be present are also designed in the same structure. Therefore, the number of pieces effect that has been described is also obtained with respect to the auxiliary drive transmission and the travel drive transmission.

[0035] According to another preferred embodiment of the present invention, the drive system also includes an energy storage device and is configured to operate the first electric motor, the second electric motor and / or the third electric motor in generator operation to charge the energy storage device. Therefore, kinetic energy can be advantageously recovered by the first electric motor, the second electric motor or the third electric motor and delivered to the energy storage device. In the recovery operation, the first electric motor, the second electric motor and the third electric motor operate as generators and convert mechanical energy, i.e. kinetic energy, into electrical energy. These electrical energies can be extracted from the energy storage device again when necessary to supply the first electric motor, the second electric motor or the third electric motor. In addition, it can be provided that the energy storage device is charged with external electrical energy via a charging cable or other suitable charging device, such as an inductive charging device. Using the first electric motor, the second electric motor or the third electric motor for recovery can also reduce the wear of the mechanical friction brake.

[0036] The invention also relates to a working machine comprising a drive train according to the invention. The advantages already described with regard to the drive train according to the invention also apply to the working machine according to the invention.

[0037] It is preferably provided that the working machine is designed as an agricultural working machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is explained exemplarily below in conjunction with the embodiments shown in the drawings.

[0039] in:

[0040] Figure 1 A possible embodiment of a drive train of a working machine according to the invention is shown by way of example and schematically;

[0041] Figure 2 Further possible embodiments of a drive train of a working machine according to the invention are shown by way of example and schematically;

[0042] Figure 3 Further possible embodiments of a drive train of a working machine according to the invention are shown by way of example and schematically;

[0043] Figure 4 Further possible embodiments of a drive train of a working machine according to the invention are shown by way of example and schematically.

[0044] The same subject matter, functional units and similar components are marked with the same reference numerals in all the drawings. These subject matter, functional units and components of the same type are implemented the same in terms of technical features unless otherwise specified explicitly or implicitly in the description. DETAILED DESCRIPTION

[0045] Figure 1The method for ( Figure 1 A possible implementation of a drive train 1 of a working machine (not shown in the figure). The drive train 1 includes: a first electric motor 2, the first electric motor having a first drive shaft 3 that can be driven by the first electric motor 2; a second electric motor 4, the second electric motor having a second drive shaft 5 that can be driven by the second electric motor 4. A first coupling wheel 6 is arranged on the first drive shaft 3 and a second coupling wheel 7 is arranged on the second drive shaft 5, wherein the first coupling wheel 6 meshes with the second coupling wheel 7. The first coupling wheel 6 and the second coupling wheel 7 can realize the transmission coupling between the first drive shaft 3 and the second drive shaft 5. As shown in FIG. Figure 1 It can also be seen that the first coupling wheel 6 is connected to the first drive shaft 3 in a rotationally fixed manner, while the second coupling wheel 7 is constructed as an idler wheel and can be connected to the second drive shaft 5 in a transmission manner by means of a coupling element 8. The coupling element 8 is constructed as a diaphragm brake, for example. In the engaged state of the coupling element 8, the second coupling wheel 7 is coupled to the second drive shaft 5 in a rotationally fixed manner, so that in this state, there is a transmission coupling between the first drive shaft 3 and the second drive shaft 5. In the disconnected state of the coupling element 8, the second coupling wheel 7 is not coupled to the second drive shaft 5, so that in this state, there is no transmission coupling between the first drive shaft 3 and the second drive shaft 5. In addition, a first clutch 9 for interrupting the power flow on the first drive shaft 3 is connected in a transmission manner behind the first coupling wheel 6, and a second clutch 10 for interrupting the power flow on the second drive shaft 5 is connected in a transmission manner behind the second coupling wheel 7.

[0046] When the first clutch 9 is disengaged and the second clutch 10 is engaged, i.e. when the power flow on the first drive shaft 3 is interrupted from the first clutch 9, when the coupling element 8 is additionally engaged, the full power or full torque of the first electric motor 2 can be provided on the second drive shaft 5 via the first coupling wheel 6 and the second coupling wheel 8. Conversely, when the second clutch 10 is disengaged and the first clutch 9 is engaged, i.e. when the power flow on the second drive shaft 5 is interrupted from the second clutch 10, when the coupling element 8 is additionally engaged, the full power or full torque of the second electric motor 4 can be provided on the first drive shaft 3. When both the first clutch 9 and the second clutch 10 are engaged and the coupling element 8 is additionally disengaged, the first electric motor 2 drives only the first drive shaft 3, and the second electric motor 4 drives only the second drive shaft 5. For example, the first electric motor 2 drives the travel drive of the working machine via the first drive shaft 3, and the second electric motor 4 drives the auxiliary drive of the working machine via the second drive shaft 5.

[0047] Figure 2 The method for ( Figure 2Another possible embodiment of the drive train 1 of the working machine (not shown in the figure). The drive train 1 includes: a first electric motor 2, the first electric motor having a first drive shaft 3 that can be driven by the first electric motor 2; a second electric motor 4, the second electric motor having a second drive shaft 5 that can be driven by the second electric motor 4. A first coupling wheel 6 is arranged on the first drive shaft 3, and a second coupling wheel 7 is arranged on the second drive shaft 5, wherein the first coupling wheel 6 is meshed with the second coupling wheel 7. The first coupling wheel 6 and the second coupling wheel 7 can realize the transmission coupling between the first drive shaft 3 and the second drive shaft 5. As shown from Figure 2 It can also be seen that the second coupling wheel 7 is implemented as an idler wheel and can be connected to the second drive shaft 5 in a transmission manner by means of a coupling element 8. The coupling element 8 is constructed as a diaphragm brake, for example. In the engaged state of the coupling element 8, the second coupling wheel 7 is coupled to the second drive shaft 5 in a rotationally fixed manner, so that in this state, there is a corresponding transmission coupling between the first drive shaft 3 and the second drive shaft 5. In the disconnected state of the coupling element 8, the second coupling wheel 7 is not coupled to the second drive shaft 5, so that in this state, there is no transmission coupling between the first drive shaft 3 and the second drive shaft 5. In addition, the second coupling wheel 7 can be locked by means of a locking device 14. The locking device is also constructed as a diaphragm brake, for example. When the locking device 14 is engaged, the second coupling wheel 7 is held on the housing 15 in a rotationally fixed manner. In the disconnected state of the locking device 14, the second coupling wheel 7 can rotate relative to the housing 15. In addition, a planetary gear set 11 is arranged on the first drive shaft 3, wherein a first input end of the planetary gear set 11 is connected in a driving manner to the first coupling wheel 3. For example, the first input end of the planetary gear set 11 is a planet carrier 12 of the planetary gear set 11. A second input end of the planetary gear set 11 is connected in a driving manner to the first drive shaft 3, wherein the second input end of the planetary gear set 11 is, for example, a sun gear 13.

[0048] When the locking element 14 is now open and the coupling element 8 is engaged, the power provided by the first electric motor 2 or the torque provided by the first electric motor 2 can be evenly distributed to the first drive shaft 3 and the second drive shaft 5. Similarly, the power provided by the second electric motor 4 or the torque provided by the second electric motor 4 can be evenly distributed to the first drive shaft 3 and the second drive shaft 5. Here, the conversion of the rotational speed and torque respectively input by the first electric motor 2 and the second electric motor 4 occurs via the planetary gear set 11. When the locking element 14 is engaged and the coupling element 8 is open, the first electric motor 2 drives only the first drive shaft 3, and the second electric motor 4 drives only the second drive shaft 5. For example, the first electric motor 2 drives the travel drive of the working machine via the first drive shaft 3, and the second electric motor 4 drives the auxiliary drive of the working machine via the second drive shaft 5.

[0049] Figure 3 The method for ( Figure 3 Further possible embodiments of the drive train 1 of a working machine (not shown). Figure 3 The drive train 1 shown in FIG. 1 corresponds to Figure 2 1, but furthermore has a third electric motor 16, which is drive-connected to the output 18 of the planetary gear set 11 via a fixed gear 17. Thus, additional power or additional torque can be provided to the first drive shaft 3 via the third electric motor 16.

[0050] Figure 4 The method for ( Figure 4 Further possible embodiments of the drive train 1 of a working machine (not shown). Figure 4 The drive train 1 shown in FIG. 1 corresponds to Figure 2 , but without the locking element 14 and the coupling element 8. As a result, the first electric motor 2 and the second electric motor 4 or the first drive shaft 3 and the second drive shaft 5 are permanently coupled to each other, so that power or torque is permanently transmitted from the first electric motor 2 not only to the first drive shaft 3 but also to the second drive shaft 5, and vice versa, power or torque is permanently transmitted from the second electric motor not only to the second drive shaft 5 but also to the first drive shaft 3.

[0051] Reference numerals list

[0052] 1 Drive system

[0053] 2 First Electric Motor

[0054] 3 First drive shaft

[0055] 4 Second electric motor

[0056] 5 Second drive shaft

[0057] 6 First coupling wheel

[0058] 7 Second coupling wheel

[0059] 8 Coupling elements

[0060] 9 First Clutch

[0061] 10 Second clutch

[0062] 11 Planetary gear unit

[0063] 12 Planet carrier

[0064] 13 Sun gear

[0065] 14 Locking device

[0066] 15 Housing

[0067] 16 Third electric motor

[0068] 17 Fixed wheel

[0069] 18 Output of the planetary gear unit

Claims

1. A drive train (1) for a working machine, wherein: The drive train (1) comprises: a first electric motor (2), the first electric motor having a first drive shaft (3) that can be driven by the first electric motor (2); a second electric motor (4), the second electric motor having a second drive shaft (5) that can be driven by the second electric motor (4), The invention is characterized in that a first coupling wheel (6) is arranged on the first drive shaft (3), and a second coupling wheel (7) is arranged on the second drive shaft (5), wherein the first coupling wheel (6) meshes with the second coupling wheel (7), wherein the first coupling wheel (6) is fixedly connected to the first drive shaft (3) in a transmission manner, the second coupling wheel (7) is constructed as an idler wheel and can be connected to the second drive shaft (5) in a transmission manner by means of a coupling element (8), a first clutch (9) for interrupting the power flow on the first drive shaft (3) is connected in a transmission manner behind the first coupling wheel (6), and a second clutch (10) for interrupting the power flow on the second drive shaft (5) is connected in a transmission manner behind the second coupling wheel (7), and wherein the first electric motor (2) is assigned to a travel drive and the second electric motor (4) is assigned to an auxiliary drive.

2. The drive train (1) according to claim 1, It is characterized in that A planetary transmission set (11) is arranged on the first drive shaft (3), wherein a first input end of the planetary transmission set (11) is connected to the first coupling wheel (6) in a transmission manner, and wherein a second input end of the planetary transmission set (11) is connected to the first drive shaft (3) in a transmission manner.

3. The drive train (1) according to claim 2, It is characterized in that The first input end is configured as a planet carrier (12), wherein the planet carrier (12) is connected to the first coupling gear (6) in a rotationally fixed manner, and the second input end is configured as a sun gear (13), wherein the sun gear (13) is connected to the first drive shaft (3) in a rotationally fixed manner.

4. The drive train (1) according to claim 2 or 3, It is characterized in that The second coupling wheel (7) is designed as an idler wheel, wherein the second coupling wheel (7) can be locked by means of a locking device (14) and can be connected to the second drive shaft (5) in a driving manner by means of a coupling element (8).

5. The drive train (1) according to claim 2 or 3, It is characterized in that The third electric motor (16) is in driving connection with the output end (18) of the planetary transmission assembly (11).

6. The drive train (1) according to claim 1, It is characterized in that The auxiliary driving part includes a mechanical power output shaft driver and a hydraulic pump driver.

7. The drive train (1) according to claim 1 or 6, It is characterized in that The auxiliary drive unit includes an auxiliary drive unit transmission device capable of power shifting.

8. The drive train (1) according to claim 1 or 6, It is characterized in that The traction drive comprises a power-shiftable traction drive transmission.

9. The drive train (1) according to any one of claims 1 to 3, It is characterized in that The first electric motor (2) and the second electric motor (4) are arranged in a common housing (15).

10. The drive train (1) according to any one of claims 1 to 3, It is characterized in that The first electric motor (2) and the second electric motor (4) are designed to be structurally identical.

11. The drive train (1) according to any one of claims 1 to 3, It is characterized in that The drive train (1) further comprises an electrical energy storage device and is designed to operate the first electric motor (2) and the second electric motor (4) in generator operation in order to charge the electrical energy storage device.

12. The drive train (1) according to claim 5, It is characterized in that The drive train (1) further comprises an electrical energy storage device and is designed to operate the first electric motor (2) and the second electric motor (4) and / or the third electric motor (16) in generator operation in order to charge the electrical energy storage device.

13. A working machine comprising a drive train according to any one of claims 1 to 12.

14. The working machine according to claim 13, It is characterized in that The working machine is designed as an agricultural working machine.

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