Test stand for testing an electrically drivable axle module for a motor vehicle, and modular system

Abstract

The invention relates to a test stand (100) for testing an electrically drivable axle module (140) for a motor vehicle, comprising at least one first loading motor (110), a second loading motor (120), and a test stand base (130) with a test object receiving area (131) for receiving the axle module (140), wherein a first motor shaft (111) of the first loading motor (110) can be connected to a first output shaft (142) of the axle module (140) without a transmission, and a second motor shaft (121) of the second loading motor (120) can be connected to a second output shaft (143) of the axle module (140) without a transmission. The first loading motor (110) and the second loading motor (120) are designed as respective permanently excited synchronous motors with at least 12 magnetic pole pairs. The test stand (100) according to the invention is characterized in that the first loading motor (110) is arranged on a first slide (150) on the test stand base (130) so as to be advanceable towards the axle module (140), and the second loading motor (120) is arranged on a second slide (160) on the test stand base (130) so as to be advanceable towards the axle module (140). The invention additionally relates to a corresponding modular system.

Description

[0001] Test bench for testing an electrically driven axle module for a motor vehicle and modular system The invention relates to a test bench for testing an electrically driven axle module for a motor vehicle according to the preamble of claim 1 and a corresponding modular system. Transmission test benches for testing motor vehicle transmissions or drive train test benches for testing complete motor vehicle drive trains are known from the prior art. Such test benches can be used, for example, for quality control in order to detect malfunctions in drive trains at an early stage through a series of load tests. Typical malfunctions arise, for example, from components subject to play, such as gears, synchronizer rings, synchronizer bodies, multi-plate clutch discs and shafts, which can be deflected and excited to vibrate.As part of this type of quality control, the acoustic behavior and shifting quality are usually also tested. Such test benches are also used in the development and for the continuous improvement of motor vehicle drive trains. In this context, DE 4328537 C2 describes a transmission test bench with a first servomotor that serves as the drive motor and a second servomotor that serves as the brake motor. The drive motor is connected to the input shaft of a motor vehicle transmission to be tested via a coupling and is controlled, among other things, with regard to its speed via a PC, so that any speed curves can be simulated. The brake motor is connected to an output shaft of the motor vehicle transmission to be tested via another coupling. The speed of the brake motor is also controlled via the PC. The speed curves simulated by the PC are speed curves measured in real driving tests.Thus, the motor vehicle transmission according to DE 4328537 C2 can be tested before installation in a motor vehicle. DE 10328461 A1 discloses a vehicle test bench with a loading machine for each drivable wheel of a motor vehicle. The loading machines are connected directly, for example via wheel bolts, or indirectly, for example via a belt drive, to the rims of the motor vehicle wheels, so that the loading machines can both drive and brake the drive train. The vehicle test bench of DE 10328461 A1 further comprises a frame structure, via which the motor vehicle and the loading machines can be lifted and aligned with each other. During the test process, the motor vehicle is held entirely by the frame structure, so that the vehicle wheels have no contact with the ground.However, the known motor vehicle test benches have several disadvantages: Firstly, they are comparatively large and therefore require comparatively large installation areas. Secondly, they exhibit a less than ideal power flow from the load motors to the foundation of the test bench. It is an object of the present invention to propose an improved test bench for testing an electrically driven axle module for a motor vehicle. This object is achieved according to the invention by the test bench for testing an electrically driven axle module for a motor vehicle according to claim 1. Advantageous embodiments emerge from the subclaims.The invention relates to a test bench for testing an electrically driven axle module for a motor vehicle, comprising at least a first load motor and a second load motor as well as a test bench foundation with a test specimen holder for receiving the axle module, wherein a first motor shaft of the first load motor can be connected without a gear ratio to a first output shaft of the axle module and a second motor shaft of the second load motor can be connected without a gear ratio to a second output shaft of the axle module and wherein the first load motor and the second load motor are each designed as permanently excited synchronous motors with at least twelve magnetic pole pairs.The test bench according to the invention is characterized in that the first load motor is arranged on a first carriage on the test bench foundation so that it can be delivered to the axle module, and in that the second load motor is arranged on a second carriage on the test bench foundation so that it can be delivered to the axle module. The invention therefore describes a test bench suitable for testing an electrically driven axle module for a motor vehicle, which usually comprises a transmission and two wheel shafts in addition to the electric drive motor. The test bench according to the invention comprises at least a first load motor and a second load motor, which are designed as electric motors, namely as permanently excited synchronous motors with at least twelve magnetic pole pairs.Electric motors themselves are generally comparatively compact, have a broad speed spectrum, particularly compared to internal combustion engines, and advantageously exhibit their maximum torque over a wide speed range. The described permanent magnet synchronous motors with at least twelve magnetic pole pairs in particular are also known as so-called synchro-torque motors. This results in the advantage that the load motors are particularly compact and, in particular, axially short and slow-rotating, yet can provide high torque. For example, the first and second load motors can provide speeds of up to 3,000 rpm. Each load motor comprises a motor housing that encloses the load motor. The motor housings are, for example, cylindrical. The motor housings can also be water-cooled.Each load motor is advantageously assigned its own inverter. The inverter is, for example, three-phase. The first load motor has a first motor shaft and the second load motor has a second motor shaft, wherein the first motor shaft of the first load motor is connectable to a first output shaft of the axle module to be tested and likewise the second motor shaft of the second load motor is connectable to the second output shaft of the axle module. The connection is designed as a rotationally fixed and gear-free drive connection. A gear-free connection in the sense of the invention is understood to be a connection without an intermediate gear stage or gearbox, i.e. there is no speed transmission. Accordingly, the test bench according to the invention can advantageously be operated without a comparatively expensive gearbox ora corresponding gear ratio is designed to reduce the motor speed, which significantly reduces both the required installation space and the manufacturing costs. By omitting the gears for speed reduction of the first and second load motors according to the invention, not only the gears but also the connecting means otherwise required to connect the first and second load motors, such as corresponding couplings, are no longer required. In addition, no mechanical protective measures need to be provided to cover the rapidly rotating connecting means. A further advantage of omitting the gears is that no switching operations for speed or torque adjustment are required and, accordingly, the axle module can be loaded continuously without interruption in switching.Since the transmissions of similar test benches are usually switched pneumatically or hydraulically, a corresponding pneumatic or hydraulic device can advantageously be dispensed with. For the purposes of the invention, a drive connection is understood to be a mechanical connection for transmitting mechanical power. The mechanical connection can be direct or, for example, also comprise intermediate shafts. The first output shaft and the second output shaft of the axle module are typically the first wheel shaft and the second wheel shaft of the axle module, which, during operation of the axle module, are subjected to a torque and a speed by an electric drive motor of the axle module via a gearbox of the axle module.Via the drive connection of the first output shaft to the first motor shaft and of the second output shaft to the second motor shaft, torques and speeds generated by the first and second load motors can also be introduced into the axle module, meaning that the axle module can also be subjected to these torques and speeds, i.e. loaded. The torque and speed together each represent a mechanical power with which the axle module is loaded accordingly. The test bench also comprises a test bench foundation with a test specimen holder for holding the axle module. The axle module can be arranged on the test bench via the test specimen holder and thus subjected to a test process. The test bench foundation is the element on which all other components of the test bench are arranged.The test bench foundation thus arranges all other components of the test bench in relation to one another and holds them in the specified position. Thus, the test bench foundation represents, at least in a figurative sense, a kind of scaffolding or frame on which the other components of the test bench are arranged. The test bench foundation is advantageously made at least partially of a particularly rigid material such as mineral casting, in particular with a metallic skeleton structure. Due to the compact design of the first and second load motors and the omission of the gearbox, the test bench foundation in particular can be made significantly smaller, which in turn leads to considerable cost savings in this area as well.According to the invention, it is now provided that the first load motor is arranged on a first carriage on the test bench foundation so that it can be delivered to the axle module, and that the second load motor is arranged on a second carriage on the test bench foundation so that it can be delivered to the axle module. The first load motor is therefore arranged on a first carriage and the second load motor is arranged on a second carriage. The first and the second carriage are each arranged movably on the test bench foundation, for example on a rail, so that they can be moved towards the axle module as required, i.e. can be delivered to the axle module, or moved away from the axle module. This makes it easy to establish and release the drive connection from the first motor shaft to the first output shaft.the drive connection from the second motor shaft to the second output shaft can be established and released again. This also significantly simplifies the assembly of the axle module on the test bench. According to a preferred embodiment of the invention, the test bench further comprises a drive motor, wherein a drive motor shaft of the drive motor can be connected to an input shaft of the axle module. This results in the advantage that in this case the axle module is not driven by its own drive motor dedicated to the axle module, but instead a drive motor assigned to the test bench and connected to the test bench foundation is used to test the axle module, which generally allows comparatively more extensive and intensive tests. The drive motor is advantageously arranged on a third carriage, in a similar way to the first and second load motors.The third carriage can also be moved toward the axis module, for example, by being arranged so that it can move along a rail. The drive motor is also advantageously designed as a so-called synchro-torque motor with at least twelve magnetic pole pairs. A three-phase inverter is also preferably assigned to the drive motor. A motor shaft of the drive motor can preferably be connected to an input shaft of the axis module in a rotationally fixed and gear-free manner. According to a further preferred embodiment of the invention, it is provided that the first carriage is designed as a first clamping angle and the second carriage is designed as a second clamping angle.A clamping angle is a component that essentially has two mutually perpendicular, i.e., orthogonal, surfaces. A first surface of which serves to accommodate the respective load motor, for example, via a motor mount, and a second surface of which serves to be arranged on the test bench foundation so that it can be moved, for example, via a rail. The first and second clamping angles are preferably made of steel. In addition to the two surfaces that span the eponymous angle, they can also have additional stiffening struts that connect the first and second surfaces to each other and thus provide additional stiffening.According to a further preferred embodiment of the invention, it is provided that the first load motor is arranged with one end face adjacent to a motor mount of the first carriage, and the second load motor is arranged with one end face adjacent to a motor mount of the second carriage. For this purpose, the first and second carriages have a first motor mount and a second motor mount, respectively. This results in a comparatively large contact surface for the first load motor and the second load motor on the respective carriage. This, in turn, also leads to comparatively high rigidity, so that the occurrence of vibrations in the area of ​​the load motors can be effectively prevented during test operation. This type of connection of the load motors also has the advantage that the torques or forces generated in the first and second carriages are distributed uniformly.second carriage and from there into the test bench foundation. This creates a clear flow of force. The front end of the first and second load motors, with which the first and second load motors are connected to the base frame, is preferably the so-called a-side of the load motors. Preferably, the first and second motor mounts are each a flange connection. A first part of the flange connection is the front end of the respective load motor or the front end of the housing of the respective load motor, and a second part is the corresponding motor mount on the respective carriage.Due to the possibility of arranging the first and second load motors via a flange connection on the test stand foundation, the test stand according to the invention can also be converted relatively easily for different load intensities by arranging load motors of a higher or lower power class on the base frame. Advantageously, all load motors of the different power classes have a standardized flange interface. According to a further preferred embodiment of the invention, it is provided that the test stand comprises a module for vertical adjustment for the first load motor and / or for the second load motor and / or for the drive motor. The module for vertical adjustment advantageously allows vertical adjustment of the first or second load motor or the drive motor in order to mount them vertically on the axle module orto align the respective output shaft of the axle module and thus enable the creation of a drive connection from the first or second load motor or drive motor to the axle module. By using the vertical adjustment module, the first or second load motor or drive motor can advantageously be adjusted vertically in a simple manner and, in particular, continuously. In particular, it is therefore not necessary to detach the first or second load motor or drive motor from the motor mount and then reposition it vertically offset on the motor mount as required, e.g., using other, appropriately offset screw connections.According to a particularly preferred embodiment of the invention, the module for vertical adjustment comprises a first plate and a second plate, wherein the first plate and the second plate are arranged overlapping and wherein the first plate and the second plate are vertically adjustable relative to one another. The first plate has, for example, the motor mount, in particular in the form of a perforated ring of the flange connection. The second plate of the module for vertical adjustment can, for example, be connected directly to the clamping angle, for example also via a flange connection. The first and the second plate of the module for vertical adjustment advantageously also have at least one vertical guide rail along which the first plate can be vertically adjusted relative to the second plate.The first and second plates of the vertical adjustment module can be adjusted relative to one another, for example, manually via a screw drive or automatically via an actuator. According to a further preferred embodiment of the invention, the first motor shaft is connected to the first output shaft via a first connecting shaft in a coupling-free and rotationally fixed manner, and the second motor shaft is connected to the second output shaft via a second connecting shaft in a coupling-free and rotationally fixed manner. The first connecting shaft therefore directly connects the first output shaft to the first motor shaft, and the second connecting shaft directly connects the second output shaft to the second motor shaft. By not providing any couplings, the connections from the motor shafts to the output shafts are comparatively short and thus torsionally rigid, which in turn prevents the occurrence of torsional vibrations.In addition, no additional masses are introduced into the drive train, so that correspondingly no associated imbalances can occur. It is preferably further provided that the motor shaft of the drive motor is also connected to the input shaft of the axle module via a corresponding connecting shaft in a coupling-free and rotationally fixed manner. According to a further preferred embodiment of the invention, it is provided that the first motor shaft is rotationally fixedly connected to the first connecting shaft via a first torque sensor and the second motor shaft is rotationally fixedly connected to the second connecting shaft via a second torque sensor. The first torque sensor and the second torque sensor therefore each represent a connecting element via which the respective first motor shaft and the second motor shaft are rotationally fixedly connected to the first connecting shaft and the second connecting shaft.As a result, the torque provided by the load motors is completely guided via the first and second torque sensors, respectively. The torque sensors therefore completely detect the provided torques. The first and second torque sensors preferably each comprise one or more force-sensitive elements, in particular one or more strain gauges, which initially detect a force acting on the force-sensitive element or forces acting on the plurality of force-sensitive elements. The respective acting torque can then be determined from the detected force or forces via the geometry of the torque sensors. In a similar way, the motor shaft of the drive motor can also advantageously be connected to the connecting shaft of the drive motor via a torque sensor.According to a further preferred embodiment of the invention, the first connecting shaft is designed as a cardan shaft and the second connecting shaft is designed as a cardan shaft. This results in the advantage that the first load motor does not have to be aligned completely precisely with the first output shaft and, accordingly, the second load motor does not have to be aligned completely precisely with the second output shaft, since offset angles can be adjusted within a certain range by the respective cardan shaft. This simplifies and accelerates the clamping of the axle module in the test bench. In a similar way, the connecting shaft of the drive motor to the input shaft of the axle module can also advantageously be designed as a cardan shaft.According to a further preferred embodiment of the invention, it is provided that the first motor shaft is designed as a hollow shaft and the first torque sensor is arranged on an end face of the first load motor facing away from the axle module and / or that the second motor shaft is designed as a hollow shaft and the second torque sensor is arranged on an end face of the second load motor facing away from the axle module. In this case, the first connecting shaft can be passed through the first motor shaft designed as a hollow shaft and can be rotationally fixedly connected to the first connecting shaft on the b-side of the first load motor via the first torque sensor. Likewise, the second connecting shaft can be passed through the second motor shaft designed as a hollow shaft and can be rotationally fixedly connected to the second connecting shaft on the b-side of the second load motor via the second torque sensor.In an analogous manner, the motor shaft of the drive motor can also advantageously be designed as a hollow shaft, and the torque sensor of the drive motor can be arranged on an end face of the drive motor facing away from the axle module. According to a very particularly preferred embodiment of the invention, it is provided that the first torque sensor is arranged on an end face of the first load motor facing away from the test object and / or that the second torque sensor is arranged on an end face of the second load motor facing away from the test object. This means that the first torque sensor is arranged on the so-called b-side of the first load motor, and the second torque sensor is correspondingly arranged on the b-side of the second load motor. It is preferably provided that a speed of the first load motor, the second load motor, orof the drive motor is detected, for example via its control electronics, in particular via its inverter. From the known speed and the known torque, for example, the mechanical power with which the axle module is acted upon can then be determined. The invention further relates to a modular system for the simple production of a test bench adapted to the test object, comprising at least a first load motor and a second load motor, each from a common power class, and at least a first inverter and a second inverter, each from a common power class, wherein the common power class of the at least first and second inverters corresponds to the power class of the at least first and second electric motors. Furthermore, the modular system comprises a first carriage and a second carriage and a test bench foundation.The modular system thus allows the production of a test bench according to the invention and comprises all components of the test bench according to the invention. In addition, the modular system optionally comprises a plurality of first and second load motors as well as a plurality of first and second inverters, each of which is assigned to a power class in pairs. This means that, for example, depending on the axle module or test object to be tested, more or less powerful load motors can be arranged on the test bench and controlled via inverters adapted to the power classes of the load motors. The invention is explained below using embodiments illustrated in the figures. They show: Fig. 1 shows an example and schematically a possible embodiment of an inventive test bench for testing an electrically driven axle module for a motor vehicle and Fig.2 shows, by way of example and schematically, a possible embodiment of the first load motor in a state arranged on the first carriage in a side view. Identical objects, functional units, and comparable components are designated by the same reference numerals throughout the figures. These objects, functional units, and comparable components are identical in terms of their technical features, unless explicitly or implicitly stated otherwise in the description. Fig. 1 shows, by way of example and schematically, a possible embodiment of a test bench 100 according to the invention for testing an electrically driven axle module 140 for a motor vehicle (not shown in Fig. 1). The test bench 100 comprises a first load motor 110 and a second load motor 120, as well as a test bench foundation 130. The test bench foundation 130 has a test specimen holder 131 for receiving the axle module 140.The drive module 140 represents the test object. The axle module 140 consists, for example, of an electric drive motor 141, a transmission, and two wheel shafts 142, 143. In the illustration in Fig. 1, the wheel shafts 142, 143 are enclosed, for example, by a rigid axle housing. However, it would also be possible to test an axle module 140 that is intended for independent wheel suspension and therefore does not have a rigid axle housing. Wheel rims 144, 145 are mounted on the axial ends of the wheel shafts 142, 143. The wheel shafts 142, 143 represent the output shafts 142, 143 of the axle module 140. A first motor shaft 111 of the first load motor 110 is connected without any gear ratio and without a clutch only via a first cardan shaft 112 to the first output shaft 142 or the first wheel rim 144 of the axle module 140.Accordingly, a second motor shaft 121 of the second load motor 120 is connected, without any gear ratio and without a clutch, to the second output shaft 143 or the second wheel rim 145 of the axle module 140 via a second cardan shaft 122. As can be seen, however, the first motor shaft 111 is not directly connected to the first cardan shaft 112; rather, the connection is made via a first torque sensor 113, which connects the first motor shaft 111 to the first cardan shaft 112 in a rotationally fixed manner. Thus, all torques introduced by the first load motor 110 into the cardan shaft 112 are guided via the first torque sensor 113 and can be detected by it. In an analogous manner, a second torque sensor 123 is also arranged between the second motor shaft 121 and the second cardan shaft 122.The first cardan shaft 112 is surrounded by a first mechanical guard 114, in particular to protect operators of the test bench 100 from injuries that could be caused by the high speeds and high torques of the first load motor. Likewise, the second cardan shaft 122 is surrounded by a second mechanical guard 124 to protect operators of the test bench 100 from injuries. The first load motor 110 and the second load motor 120 are each designed as permanent-magnet synchronous motors 110, 120 with at least twelve magnetic pole pairs. Such synchronous motors 110, 120 are also known as so-called synchro-torque motors, which are particularly compact and, in particular, axially short and slow-rotating, yet can provide high torque. For example, the first and second load motors 110 and 120 can provide speeds of up to 3,000 rpm.As can be seen, the first load motor 110 is arranged on a first carriage 150 and the second load motor 120 is arranged on a second carriage 160. The first carriage 150 and the second carriage 160 can be advanced along a rail (not shown in Fig. 1) in the direction of the axis module 140. This simplifies the assembly of the axis module 140. The first carriage 150 is designed as a first clamping angle 150 made of steel and the second carriage 160 is designed as a second clamping angle 160, also made of steel. The first carriage 150 has a motor mount 152 designed as a flange connection for the first load motor 110. Accordingly, the second carriage 160 has a motor mount 162 designed as a flange connection for the second load motor 120. The first load motor 110 is connected to a front side, namely the so-called, via the first motor mount 152.a-side, adjacent to the motor mount 152 of the first carriage 150. In a similar manner, the second load motor 120 is arranged with one end face, namely also with the a-side, adjacent to the motor mount 162 of the second carriage 160. This enables a comparatively rigid connection of the first and second load motors 110, 120 to the test bench 100. According to a further exemplary embodiment not shown in the figures, the axle module 140 of Fig. 1 does not comprise its own drive motor. Instead, the test bench 100 according to the invention comprises, for example, a drive motor which, like the two load motors 110, 120, is designed as a permanently excited synchronous motor with at least twelve magnetic pole pairs.The drive motor of the test bench 100 is arranged in a T-arrangement with respect to the two load motors 110, 120 such that it is perpendicular to an imaginary axis through the first and second load motors 110, 120, and its motor shaft is connectable to an input shaft of the axle module 140 via a cardan shaft. Thus, the axle module 140 can be driven by the drive motor for a test process and loaded by the load motors 110, 120. Fig. 2 shows, by way of example and schematically, a possible embodiment of the first load motor 110 in a state arranged on the first carriage 150 in a side view. The first load motor 110 is arranged with its a-side on the first carriage 150, with a module for vertical adjustment 170 located between the first carriage 150 and the first load motor 110.The vertical adjustment module 170 is arranged with a first side on the first carriage 150 and with a second side on the a-side of the first load motor 110. The vertical adjustment module 170 accordingly has, for example, the motor mount 152 for the first load motor 110. The vertical adjustment module 170 enables vertical adjustability, i.e., height adjustability, of the first load motor 110 arranged on the second side of the vertical adjustment module 170 relative to the first carriage 150 arranged on the first side of the vertical adjustment module 170. As a result, the first load motor 110 can be brought vertically into a position that allows the most straight-line connection possible between the first motor shaft 111 and the first output shaft 142 of the axle module 140. The first drive shaft 112 therefore only has to compensate for a smaller angular offset.As can also be seen, the first carriage 150 is designed as a first clamping angle 150 made of steel and is arranged on the test stand foundation 130 so as to be axially movable along a rail (not shown). As can also be seen, the first carriage also has a stiffening strut 151 in order to prevent the occurrence of vibrations as much as possible. According to a further exemplary embodiment, the electric motor shown in Fig. 2 is the second load motor 120, which is arranged on the second carriage 150. According to yet another exemplary embodiment, the electric motor shown in Fig. 2 is the drive motor, which is arranged on a carriage assigned to the drive motor.

[0002] Reference numeral 100 Test bench 110 First load motor 111 First motor shaft 112 First connecting shaft, first cardan shaft 113 First torque sensor 114 First mechanical protection 120 Second load motor 121 First motor shaft 122 Second connecting shaft, second cardan shaft 123 Second torque sensor 124 Second mechanical protection 130 Test bench foundation 131 Test specimen holder 140 Test specimen 141 Electric drive motor of the test specimen 142 First output shaft, first wheel shaft 143 Second output shaft, second wheel shaft 144 First wheel rim 145 Second wheel rim 150 First carriage, first clamping angle 151 Stiffening strut 152 Motor mount, flange connection 160 Second carriage, second clamping angle 162 Motor mount, flange connection 170 Module for vertical adjustment

Claims

Claim 1. Test rig (100) for testing an electrically driven axle module (140) for a motor vehicle, comprising at least one first load motor (110) and one second load motor (120) as well as a test rig foundation (130) with a test specimen holder (131) for receiving the axle module (140), wherein a first motor shaft (111) of the first load motor (110) can be connected without a transmission to a first output shaft (142) of the axle module (140) and a second motor shaft (121) of the second load motor (120) can be connected without a transmission to a second output shaft (143) of the axle module (140) and wherein the first load motor (110) and the second load motor (120) are each designed as permanent magnet synchronous motors with at least twelve magnetic pole pairs, characterized bythat the first load motor (110) is arranged on a first slide (150) on the test stand foundation (130) so as to be adjustable to the axle module (140), and that the second load motor (120) is arranged on a second slide (160) on the test stand foundation (130) so as to be adjustable to the axle module (140).

2. Test stand (100) according to claim 1, characterized in that the test stand (100) further comprises a drive motor, wherein a drive motor shaft of the drive motor is connectable to an input shaft of the axle module (140).

3. Test stand (100) according to at least one of claims 1 and 2, characterized in that the first slide (150) is configured as a first mounting bracket (150) and the second slide (160) is configured as a second mounting bracket (160).

4. Test stand (100) according to at least one of claims 1 to 3, characterized in that,that the first load motor (110) is arranged with one end face abutting a motor mount (152) of the first slide (150) and the second load motor (120) is arranged with one end face abutting a motor mount (162) of the second slide (160).

5. Test stand (100) according to at least one of claims 1 to 4, characterized in that the test stand (100) comprises a module for vertical adjustment (170) for the first load motor (110) and / or for the second load motor (120) and / or for the drive motor.

6. Test stand (100) according to at least one of claims 1 to 5, characterized in that the first motor shaft (111) is connected to the first output shaft (142) via a first connecting shaft (112) in a coupling-free and rotationally fixed manner, and the second motor shaft (121) is connected to the second output shaft (143) via a second connecting shaft (122) in a coupling-free and rotationally fixed manner. 7.Test rig (100) according to at least one of claims 1 to 6, characterized in that the first motor shaft (111) is rotationally fixed to the first connecting shaft (112) via a first torque sensor (113) and the second motor shaft (121) is rotationally fixed to the second connecting shaft (122) via a second torque sensor (123).

8. Test rig (100) according to claim 7, characterized in that the first connecting shaft (112) is designed as a cardan shaft (112) and the second connecting shaft (122) is designed as a cardan shaft (122). 9.Test bench (100) according to at least one of claims 7 and 8, characterized in that the first motor shaft (111) is designed as a hollow shaft and the first torque sensor (113) is arranged on an end face of the first load motor (110) facing away from the axle module (140) and / or that the second motor shaft (212) is designed as a hollow shaft and the second torque sensor (123) is arranged on an end face of the second load motor (120) facing away from the axle module (140).

10. Modular system for the easy production of a test specimen-adapted test stand (100) according to at least one of claims 1 to 9, comprising at least one first load motor (110) and one second load motor (120) each from a common power class, as well as at least one first inverter and one second inverter each from a common power class, wherein the common power class of the at least first and second inverter corresponds to the power class of the at least first and second electric motor (110, 120), further comprising a first carriage (150) and a second carriage (160) as well as a test stand foundation (130).

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