Test stand for testing properties of an electrically drivable axle module for a motor vehicle

Abstract

The invention relates to a test stand (100) for testing properties of an electrically drivable axle module (10), comprising at least one loading unit and at least one test object support (110) having a mechanical interface (120) for clamping the axle module (10), wherein the test stand (100) has a clamping holder magazine (131) for storing a plurality of different exchangeable clamping holders (130, 130', 130", 130'''), the test stand (100) is designed to automatically clamp the axle module (10) on the test object holder (120) by means of a vertical movement of a clamping holder (130, 130', 130", 130'''), and the test stand (100) is designed to automatically change the clamping holders (130, 130', 130", 130'''). The test stand (100) according to the invention is characterized in that the clamping holder magazine (131) is a revolver magazine (131) with a rotatable clamping holder support (144), and different clamping holders (130, 130', 130", 130''') are provided on different outer surfaces (132, 132', 132", 132''') of the clamping holder support (133) such that the clamping holders (130, 130', 130", 130''') are changed by rotating the clamping holder support (133).

Description

[0001] Test bench for testing properties of an electrically driven axle module for a motor vehicle

[0002] The invention relates to a test bench for testing properties of an electrically driven axle module for a motor vehicle according to the preamble of claim 1.

[0003] Transmission test benches or drivetrain test benches for testing motor vehicle transmissions or entire motor vehicle drivetrains are well known in the art. Such test benches are typically used for quality control purposes to detect malfunctions in drivetrains at an early stage through a series of stress 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 such quality control, the acoustic behavior and shifting quality are usually also tested. Furthermore, such test benches are also used in the development and continuous improvement of motor vehicle drivetrains.

[0004] DE 10 2022 202 300 A1 describes a so-called "end-of-line" test bench, which is used to subject an electric axle drive to a functional test immediately after its assembly. For this purpose, the electric axle drive is mounted in the test bench, and the two output shafts of the axle drive are automatically connected in a rotationally fixed manner to two test bench shafts, each of which is connected to a load motor on the test bench.

[0005] The applicant's as yet unpublished DE 102022 207 056.9 describes a test bench for testing the properties of an electrically driven axle module for a motor vehicle. The test bench comprises at least one load unit and at least one test specimen carrier, wherein the test specimen carrier in turn comprises a mechanical interface for clamping the axle module, an electrical interface for supplying current to the axle module, a sensor interface for contacting sensors of the axle module, and a fluid interface for supplying fluid to the axle module. The mechanical interface is designed as an interchangeable test specimen holder, onto which the axle module can be placed via defined contact points. Finally, the test bench comprises a clamping fixture magazine for storing a variety of different interchangeable clamping fixtures, which can be changed automatically by the test bench.

[0006] However, the known automotive test benches have the disadvantage that even an automated change of the clamping fixture by the test bench leads to an undesirable cycle time delay.

[0007] It is an object of the present invention to propose an improved test bench for testing properties of an electrically driven axle module for a motor vehicle.

[0008] This object is achieved according to the invention by the test bench for testing properties of an electrically driven axle module for a motor vehicle according to claim 1. Advantageous embodiments emerge from the subclaims.

[0009] The invention relates to a test bench for testing properties of an electrically driven axle module for a motor vehicle, comprising at least one load unit and at least one test specimen carrier with a mechanical interface for clamping the axle module, wherein the mechanical interface is designed as an exchangeable test specimen holder onto which the axle module can be placed via defined contact points, wherein the test bench has a clamping holder magazine for storing a plurality of different exchangeable clamping holders, wherein the test bench is designed to automatically clamp the axle module onto the test specimen holder by means of a vertical movement of a clamping holder and wherein the test bench is designed to automatically change the clamping holders.

[0010] The invention therefore describes a test bench suitable for testing the properties of an electrically driven axle module for a motor vehicle. The properties that can be tested using the test bench are preferably mechanical properties and acoustic properties under various mechanical loads on the axle module, whereby the loads can be specified by the at least one load unit.

[0011] The electrically driven axle module is designed for operation in a motor vehicle, preferably a passenger car. The axle module comprises an electric drive motor, a speed reduction gear, in particular a switchable speed reduction gear, and at least one output shaft. Preferably, however, the axle module comprises two output shafts, each of the two output shafts representing a wheel shaft of the axle.

[0012] The at least one load unit is advantageously at least one electric motor. Electric motors are comparatively compact, have a wide speed range, especially compared to combustion engines, and advantageously exhibit a largely maximum torque over a wide speed range.

[0013] Advantageously, a load unit is provided for each output shaft of the axle module, so that the test bench will generally have two load units.

[0014] The at least one load unit has a motor shaft, each of which can be drivingly connected to an output shaft of the axle module. Thus, the axle module can be subjected to predefined torques and speeds by the at least one load unit. The torque and speed together represent a mechanical power with which the axle module can be loaded—in other words, the mechanical load of the axle module.

[0015] At the same time, the electric motor of the axle module can also generate a predefined speed and a predefined torque, which can, for example, be directed opposite to the speed and torque of the at least one load unit. The test specimen carrier serves to hold the axle module to be tested, which, within the meaning of the invention, represents the test specimen and is also sometimes referred to as such below. The test specimen carrier is required to clamp the axle module in the test bench as rigidly as possible and, at the same time, to supply it with the means or media required for its operation in the test bench.

[0016] For this purpose, the test specimen carrier first has a mechanical interface for clamping the axle module. In the context of the invention, the term "clamping" refers to the most rigid connection of the axle module to the test bench, so that vibrations that could disrupt the test operation are minimized. The mechanical interface is adapted to the specific geometry of the axle module so that the axle module can be clamped at the contact points intended for testing. These contact points can, for example, be the positions on an axle module housing via which the axle module is also clamped in the vehicle when installed in the vehicle.

[0017] The specification of specific contact points on the axle module, for example, by the axle module manufacturer, is important because not every spot on the surface of the axle module is suitable for clamping the axle module. On the one hand, the axle module must be able to be held securely at a contact point without slipping, for example, on an inclined surface. On the other hand, the contact point must also be designed to absorb the forces and torques subjected to the axle module without being damaged or deformed as a result.

[0018] The test bench also features a clamping fixture magazine. The clamping fixture magazine can, for example, store clamping fixtures for the types of axle modules that are typically tested using the test bench. Through appropriate operator input, for example, on a PC or control unit assigned to the test bench, the type of axle module to be tested next can be specified, after which a corresponding clamping fixture is selected from the clamping fixture magazine. A clamping fixture represents the mechanical counterpart to the test specimen holder, which is lowered vertically from above onto the test specimen resting on the test specimen carrier and clamps it against the test specimen carrier at the designated contact points.

[0019] Advantageously, the clamping fixture is moved automatically and the test piece is clamped automatically when it reaches the test position. This clamps the axis module into the test stand and allows it to undergo the test procedure.

[0020] This means that the clamping of the axle module can be automated and carried out comparatively quickly without human intervention.

[0021] The clamping fixture is also interchangeable to allow testing of a wide variety of axle modules. Each clamping fixture is thus specifically adapted to the respective axle module being tested.

[0022] In contrast to the test specimen holder, the clamping holder is not arranged on the test specimen carrier or is not an interchangeable component of the test specimen carrier, but is arranged on the test stand, namely vertically movable or movable above the test specimen carrier.

[0023] It has been found that clamping the axle module between the test specimen holder and the clamping fixture creates a sufficiently rigid connection to enable testing at high speeds without the test process being adversely affected by mechanical vibrations. For example, axle modules with electric drive motors capable of operating at speeds of more than 18,000 rpm can be tested in this way.

[0024] Advantageously, the test specimen carrier is removable from the test bench, allowing the axle module to be mounted on the test specimen carrier outside the test bench – and thus comparatively more easily. The axle module is then positioned, along with the test specimen carrier, at a designated location in the test bench, namely the test position, for the test procedure.

[0025] The mechanical interface is not designed as a permanent component of the test specimen carrier, but rather is interchangeable, meaning it can be replaced with other mechanical interfaces. This allows only the mechanical interface of the test specimen carrier to be changed relatively quickly, easily, and, above all, cost-effectively, depending on the axle module to be tested. The test specimen carrier can therefore be converted to accommodate very differently designed axle modules. This eliminates the need to maintain a large number of different and comparatively expensive test specimen carriers, but rather only a corresponding number of interchangeable mechanical interfaces. The test specimen carrier itself can be easily adapted to a wide variety of axle drives.

[0026] According to the invention, it is now provided that the clamping receptacle magazine is designed as a revolver magazine with a rotatable clamping receptacle carrier, wherein different clamping receptacles are arranged on different outer surfaces of the clamping receptacle carrier, so that the clamping receptacles are changed by rotating the clamping receptacle carrier.

[0027] The revolving magazine thus comprises a clamping receptacle carrier that can rotate around a longitudinal axis and has several outer surfaces. The outer surfaces are designed and dimensioned such that they can each accommodate and hold a clamping receptacle. For example, the outer surfaces can have corresponding gripping or clamping devices for accommodating and holding the clamping receptacles.

[0028] When the clamping fixture carrier is rotated, the outer surfaces and the clamping fixtures located thereon are also rotated, so that, depending on the rotation, the desired clamping fixture points downward toward the axis module to be tested and can then be moved vertically relative to it. The revolving magazine preferably further comprises a rotary drive, in particular an electric motor, which is designed to rotate the clamping fixture carrier with the clamping fixtures.

[0029] By rotating the clamping fixtures, they can be changed very quickly and automatically. The test bench, thanks to the revolving clamping fixture magazine, is therefore not only designed to store a variety of different interchangeable clamping fixtures, but also to automatically change the clamping fixtures required for testing the respective axle module.

[0030] According to a preferred embodiment of the invention, it is provided that the clamping receptacle magazine stores two, three or four different clamping receptacles.

[0031] Accordingly, the clamping magazine has a clamping support with two, three or four outer surfaces.

[0032] Depending on the number of different clamping fixtures, the test bench can be converted to two, three or four different types of axle modules without any special setup times.

[0033] According to a further preferred embodiment of the invention, the different clamping fixtures on the clamping fixture support are also rotatable about a vertical axis. This makes it possible, for example, to provide a clamping fixture that is suitable for clamping different test specimens in different rotational orientations. This further increases the flexibility of the test bench.

[0034] The rotation around the vertical axis is preferably automated. For example, a camera sensor can detect the orientation of the test specimen or the test specimen holder, whereupon the clamping fixture is rotated accordingly. Alternatively or additionally, the at least one test specimen carrier can also have a turntable to rotate the test specimen around the vertical axis relative to the clamping fixture.

[0035] According to a further preferred embodiment of the invention, the entire clamping magazine is designed to be rotatable. In this case, not only the clamping support is rotated, but also the entire clamping magazine.

[0036] According to a further preferred embodiment of the invention, it is provided that the test bench is designed to automatically carry out an exchange of the plurality of different interchangeable clamping fixtures.

[0037] For the purposes of the invention, exchanging the plurality of different interchangeable clamping fixtures means replacing the plurality of clamping fixtures stored in the clamping fixture magazine with a different plurality of clamping fixtures. For example, if the clamping fixture magazine stores three different clamping fixtures, the three stored clamping fixtures are exchanged for three different clamping fixtures during an exchange. The clamping fixture magazine thus stores different clamping fixtures after the exchange than before the exchange.

[0038] This makes it possible to test a variety of other types of axis modules without having to allow for special setup times.

[0039] For example, the clamping fixture magazine can store the different clamping fixtures for testing different axle modules from a first manufacturer. If different axle modules from a second manufacturer are to be tested, the clamping fixtures in the clamping fixture magazine that are suitable for testing the axle modules from the first manufacturer can be exchanged for the clamping fixtures that are suitable for testing the axle modules from the second manufacturer. According to a particularly preferred embodiment of the invention, the test bench is designed to perform the exchange using a robot or a rail travel system.

[0040] Using the rail traversing system, the clamping fixtures can be fed into the clamping fixture magazine for storage, for example, from a comparatively larger arsenal of clamping fixtures, where the arsenal stores more clamping fixtures than the clamping fixture magazine. Likewise, the clamping fixtures can be removed from the clamping fixture magazine and returned to the arsenal of clamping fixtures when they are no longer needed on the test bench.

[0041] Alternatively, several clamping fixture magazines can be arranged on the rail travel system so that the clamping fixture magazine that stores the one or more clamping fixtures that are required next can be moved into the test stand.

[0042] Alternatively, the clamping fixtures can also be added to or removed from the clamping fixture magazine by a robot. The robot has access to the clamping fixture magazine as well as the larger arsenal of clamping fixtures.

[0043] According to a further preferred embodiment of the invention, it is provided that the at least one test specimen carrier further comprises an electrical interface for supplying current to the axle module, a sensor interface for contacting sensors of the axle module and a fluid interface for supplying fluid to the axle module, wherein the electrical interface, the sensor interface and the fluid interface are designed as a common multi-coupling on each of the plurality of different interchangeable clamping fixtures and wherein the test bench is designed to automatically contact the electrical interface, the sensor interface and the fluid interface via the multi-coupling in a common vertical movement of a clamping fixture when the test position is reached. The electrical interface can, for example, be one or more electrical sockets orConnectors must be designed to enable an electrical connection to the axle module's electric drive motor or its control electronics. This allows the axle module's electric drive motor to be energized and operated for testing purposes.

[0044] The sensor interface can, for example, be one or more temperature sensors, one or more position sensors for determining the rotor position of the drive motor, one or more current sensors, one or more voltage sensors, one or more speed sensors, and one or more torque sensors. The sensor interface is preferably designed as a series of plugs or sockets that enable an electrical connection to the corresponding sensors of the axle module.

[0045] Furthermore, the sensor interface can also be configured to contact one or more acoustic sensors or structure-borne sound sensors. The acoustic sensors or structure-borne sound sensors can also be assigned to the test bench and do not have to be components of the axle module. For example, the acoustic sensors or structure-borne sound sensors can be arranged on the axle module to monitor its acoustic properties.

[0046] A lubricant or coolant, for example, can be supplied to the test specimen via the fluid interface. The fluid interface is therefore advantageously designed as one or more hydraulic couplings.

[0047] The electrical interface, the sensor interface, and the fluid interface are designed as a common multi-coupling. For the purposes of the invention, a multi-coupling is understood to be a coupling that connects interfaces of different types, such as those for the power supply, fluid and sensor connection, for common contact in a common coupling. The aforementioned interfaces are preferably positioned in a defined arrangement within the multi-coupling so that a coupling counterpart, which has a mirror-image positioning of the interfaces, can contact the multi-coupling and, in the process, also contact all interfaces simultaneously. Instead of having to contact each interface individually, all three aforementioned interfaces can be contacted at once via the multi-coupling. This reduces the preparation time of the axle module for the test process.

[0048] The test bench is designed to automatically contact the electrical interface, the sensor interface and the fluid interface via the multi-coupling in a common vertical movement of a clamping fixture when the test position is reached and to automatically clamp the axle module on the test specimen holder.

[0049] Since the test bench for the vertical movement of the clamping fixture must anyway have a device for vertical adjustment, for example a hydraulic or pneumatic cylinder, an electrically adjustable threaded spindle or rack that moves the carrier, the multi-coupling can also be contacted via the device for vertical adjustment.

[0050] This eliminates the need for separate devices for vertical adjustment of the multi-coupling and the clamping fixture. This allows the multi-coupling and clamping fixture to move vertically simultaneously, accelerating the testing process.

[0051] According to a further preferred embodiment of the invention, it is provided that the multi-coupling can be supplied via a connecting element on the clamping support.

[0052] In this case, the multi-coupling can preferably be supplied independently of the clamping fixture directly via the clamping fixture support, meaning that changing the clamping fixture does not require changing the multi-coupling. Nevertheless, the multi-coupling is advantageously connected to the clamping fixture support so that it can be moved in a common vertical movement with the clamping fixture toward the test specimen.

[0053] By supplying the multi-coupling via the clamping holder carrier, i.e. by connecting the electrical interface, the sensor interface and the fluid interface of the multi-coupling to corresponding supply lines on the clamping holder carrier, the clamping holders of the clamping holder magazine can be changed without affecting the supply of the multi-coupling.

[0054] According to an alternative preferred embodiment of the invention, it is provided that the multi-coupling can be supplied via a connecting element on each of the clamping receptacles.

[0055] In this case, the multi-coupling is supplied directly via the clamping fixture, which means that when the clamping fixture is changed, the supply to the multi-coupling is also changed.

[0056] Advantageously, each clamping fixture has an interface to supply the multi-coupling with the required media, such as electricity, compressed air, or cooling oil. The selected clamping fixture is supplied with the required media via the test bench.

[0057] According to a further preferred embodiment of the invention, the test bench comprises a conveyor belt designed to automatically move the test specimen carrier into a test position in the test bench. The conveyor belt can, in particular, be designed as a roller conveyor belt.

[0058] This offers the advantage that the test specimen carrier with the axis module mounted on it can be easily placed on the conveyor belt and then moved automatically into the test position by the conveyor belt without any further human intervention. Another advantage is that after the test process is completed, the test specimen carrier with the axis module is automatically moved out of the test position again, so that the next test specimen carrier, along with the axis module mounted on it, can be moved into the test position.

[0059] According to a further preferred embodiment of the invention, the test specimen carrier comprises replaceable supply lines extending from the electrical interface, the sensor interface, and the fluid interface for electrical contact, sensor contact, and fluid contact of the axle module. Since the supply lines are replaceable, they can be replaced as needed, similar to the test specimen holders and clamping fixtures, and adapted to the axle module to be tested.

[0060] The supply lines are advantageously designed as cables, wires, or hoses. Advantageously, the supply lines each have a standardized connection, such as a socket or plug, at a first end, which is provided for connection to the electrical interface, the sensor interface, and the fluid interface. At their other end, which is provided for connection to a corresponding connection of the axle module, however, the supply lines have a connection specifically adapted to the axle module, such as a specific plug or socket. Thus, by selecting appropriate supply lines, the axle module can be connected to the interfaces of the test object carrier without the need for a completely different test object carrier adapted to the axle module.

[0061] Since the test specimen carrier can be advantageously removed from the test bench, the electrical interface, the sensor interface, and the fluid interface of the test specimen carrier are advantageously designed both as an interface for contacting the axle module and, at the same time, for contacting the test bench. This means that, for example, the interfaces can be connected to the axle module as soon as the axle module is positioned on the test specimen carrier. Upon reaching the test position in the test bench, the interfaces can also be connected to the corresponding test bench connections immediately before the test process. In other words, the electrical interface, the sensor interface, and the fluid interface connect the test bench's supply lines to the axle module's connections.

[0062] According to a particularly preferred embodiment of the invention, the supply lines are automatically connected to the axis module upon reaching the test position. This can advantageously be done via one or more robot arms, which can in particular be part of the test bench. Thus, the connection of the supply lines to the axis module can also be carried out without human intervention, which in turn reduces the preparation time for the actual test procedure.

[0063] The invention is explained below by way of example with reference to embodiments shown in the figures.

[0064] They show:

[0065] Fig. 1 shows, by way of example and schematically, a structure of a prior art test bench for testing properties of an electrically driven axle module for a motor vehicle,

[0066] Fig. 2 shows, by way of example and schematically, a possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle,

[0067] Fig. 3 shows, by way of example and schematically, a section of another possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle,

[0068] Fig. 4 shows, by way of example and schematically, a section of another possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle,

[0069] Fig. 5 shows, by way of example and schematically, another possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle, Fig. 6 shows, by way of example and schematically, another possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle,

[0070] Fig. 7 shows, by way of example and schematically, a section of another possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle and

[0071] Fig. 8 shows, by way of example and schematically, a section of another possible embodiment of a test bench according to the invention for testing properties of an electrically driven axle module for a motor vehicle.

[0072] Identical objects, functional units, and comparable components are designated by the same reference symbols 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.

[0073] Fig. 1 shows, by way of example and schematically, a front view of the structure of a test bench 100 known in the prior art for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 1). The test bench comprises, for example, two load units (not shown), each designed as an electric motor and whose motor shafts (also not shown in Fig. 1) are each connected in a rotationally fixed manner to the output shafts (also not shown in Fig. 1) of the axle module 10 via adapter shafts designed for this purpose (also not shown in Fig. 1).

[0074] Furthermore, the test bench 100 of Fig. 1 comprises a test specimen carrier 110, wherein the test specimen carrier 110 in turn comprises a mechanical interface 120 for clamping the axle module 10, an electrical interface for supplying power to the axle module 10, a sensor interface for contacting sensors of the axle module 10, and a fluid interface for supplying fluid to the axle module 10. For the sake of clarity, however, only the mechanical interface 120 is shown in Fig. 1.

[0075] As can be seen, the axle module 10 is placed on the mechanical interface 120, which is designed as an exchangeable test specimen holder 120. For this purpose, the axle module 10 has a series of defined contact points 11. The test specimen holder 120 is adapted to the specific geometry of the axle module 10 so that the axle module 10 can be clamped at the contact points 11 intended for testing, or can initially be placed on the test specimen holder 120 using the contact points 11. The contact points 11 of the axle module 10 are, for example, the same contact points 11 by which the axle module 10 is also clamped in the motor vehicle when installed in the motor vehicle.

[0076] Furthermore, Fig. 1 shows that the test bench 100 also includes an interchangeable clamping fixture 130 that can be moved along a vertical axis (represented by two arrows in Fig. 1). The clamping fixture 130 is moved by the carrier 160. Like the test specimen fixture 120, the clamping fixture 130 is designed to clamp the axle module 10 in the test bench 100, for example by clamping, in that the clamping fixture 130 is moved vertically downwards from above in order to clamp the axle module 10 at the defined contact points 11.

[0077] When the axis module 10 has been arranged on the test specimen holder 120 and the test specimen holder 120 has been arranged with the test specimen carrier 110 in the test stand 100, the clamping holder 130 can be automatically moved vertically downwards in order to clamp the axis module 10.

[0078] Also shown in Fig. 1 is a conveyor belt 170, which is designed, for example, as a roller conveyor belt 170. The conveyor belt 170 has a spring mechanism 180 (not shown in Fig. 1) below the conveyor belt 170, which spring mechanism urges the conveyor belt 170 with the test specimen carrier 110 and the test specimen holder 120 arranged thereon upwards. Both the test specimen holder 120 and the clamping holder 130 are interchangeable, i.e., different test specimen holders 120 can be arranged on the test specimen carrier 110, each of which is adapted to different axle modules 10. It is therefore advantageously not necessary to maintain a large number of comparatively expensive test specimen carriers 110, each with a fixed mechanical interface 120, in order to be able to test different types of axle modules 10 in the test bench 100.

[0079] In an analogous manner, the clamping fixture 130 is also interchangeable in order to be able to clamp and test different types of axle modules 10 in the test bench 100

[0080] Fig. 2 shows, by way of example and schematically, a possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 2).

[0081] The test bench 100 according to the invention in Fig. 2 differs from the known test bench 100 in Fig. 1 by the clamping holder magazine 131, which is designed as a revolver magazine 131 and, for example, stores four different clamping holders 130, 130', 130", 130'".

[0082] The four different clamping fixtures 130, 130', 130", 130"' are each arranged on a different outer surface 132, 132', 132", 132"' of a clamping fixture carrier 133 of the revolver magazine 131. The clamping fixture carrier 133 together with the outer surface 132, 132', 132", 132'" and the clamping fixtures 130, 130', 130", 130"' arranged thereon can be rotated along the arrow shown, so that by rotating the clamping fixture carrier 133, a clamping fixture 130, 130', 130", 130"' can be selected, by means of which the axis module 10 is to be clamped in the test stand 100.

[0083] The test bench 100 is designed to automatically change the clamping fixtures 130, 130', 130", 130"'. Fig. 3 shows, by way of example and schematically, a section of another possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 3).

[0084] The section shown in Fig. 3 shows the clamping receptacle magazine 131, which is again designed as a revolver magazine 131. However, as shown in the example, the clamping receptacle magazine 131 stores only two different clamping receptacles 130, 130'.

[0085] In addition, the clamping receptacles 130, 130' in the clamping receptacle magazine 131 can not only be rotated about the longitudinal axis of the clamping receptacle magazine 131 in order to select a clamping receptacle 130, 130', but in addition the clamping receptacles 130, 130' can also be rotated about the vertical axis, for example, which is also shown by an arrow.

[0086] Fig. 4 shows, by way of example and schematically, a section of another possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 4).

[0087] The section shown in Fig. 4 shows the clamping receptacle magazine 131, which is again designed as a revolver magazine 131. For example, the clamping receptacle magazine 131 stores three different clamping receptacles 130, 130', 130".

[0088] Fig. 5 shows, by way of example and schematically, another possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 5).

[0089] In detail, Fig. 5 shows the test stand 100 of Fig. 1 , but with the clamping holder magazine 131 designed as a revolver magazine 131. For example, the clamping holder magazine 131 stores two different clamping holders 130, 130'

[0090] The clamping magazine 131 can be rotated via an electric motor 134. The electric motor 134 is, for example, coaxial with the clamping magazine 131 and rotates the entire clamping magazine 131 together with the clamping carrier 133.

[0091] The clamping magazine 131 is rotatably mounted on the test stand 100 via the bearings 135.

[0092] Fig. 6 shows, by way of example and schematically, another possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 6).

[0093] The test bench 100 of Fig. 6 differs from the test bench 100 of Fig. 5 in the design of the clamping holder magazine 131. The electric motor 134 is arranged, for example, parallel to the clamping holder carrier 133 and rotates exclusively the clamping holder carrier 133. The clamping holder carrier 133 is rotatably mounted relative to the rest of the clamping holder magazine 131 via the bearings 135.

[0094] Fig. 7 shows, by way of example and schematically, a section of another possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 7).

[0095] The section shown in Fig. 7 shows the clamping magazine 131 of Fig. 5, wherein a connecting element 136 can also be seen, which is designed, for example, as a terminal box 136. Supply lines 137 for the electrical interface 141, the sensor interface 143, and the fluid interface 142 of the multi-coupling 140 (not shown in Fig. 140) are routed into the terminal box 136, coming from a media supply 138 of the test bench.

[0096] The terminal box 136 is arranged, for example, on the clamping support 133, so that the multi-coupling 140 can be supplied via the clamping support 133.

[0097] Fig. 8 shows, by way of example and schematically, a section of another possible embodiment of a test bench 100 according to the invention for testing properties of an electrically driven axle module 10 for a motor vehicle (not shown in Fig. 8).

[0098] The test bench 100 of Fig. 8 differs from the test bench 100 of Fig. 7 in the supply of the multi-coupling 140. According to the example, the multi-coupling 140 is supplied via the connecting element 136, wherein the connecting element 136 according to the example of Fig. 8 is not assigned to the clamping holder carrier 133, but directly to the clamping holder 130.

[0099] In this case, the connecting element 136 is in two parts and designed according to the plug-socket principle, wherein a first part 136' of the connecting element 136 is assigned to the test stand 100 and a second part 136" of the connecting element 136 is assigned to the clamping receptacles 130.

[0100] Reference symbol

[0101] Axle module, test specimen

[0102] Contact point

[0103] test bench

[0104] Test specimen carrier

[0105] Test specimen holder, mechanical interface

[0106] Clamping fixture ' Clamping fixture “ Clamping fixture '“ Clamping fixture

[0107] Clamping magazine

[0108] Outer surface ' Outer surface “ Outer surface “' Outer surface

[0109] Clamping holder carrier

[0110] electric motor

[0111] warehouse

[0112] Connecting element, terminal box ' Connecting element “ Connecting element

[0113] supply line

[0114] Media supply

[0115] Multi-coupling

[0116] Conveyor belt, roller conveyor belt

Claims

Patent claims 1. A test bench (100) for testing properties of an electrically driven axle module (10) for a motor vehicle, comprising at least one load unit and at least one test specimen carrier (110) with a mechanical interface (120) for clamping the axle module (10), wherein the mechanical interface (120) is designed as an exchangeable test specimen holder (120) onto which the axle module (10) can be placed via defined contact points (11), wherein the test bench (100) has a clamping holder magazine (131) for storing a plurality of different exchangeable clamping holders (130, 130', 130", 130'"), wherein the test bench (100) is designed to automatically clamp the axle module (10) onto the test specimen holder (120) by means of a vertical movement of a clamping holder (130, 130', 130", 130"'). and wherein the test stand (100) is designed to change the clamping fixtures (130, 130', 130", 130"') automatically, characterized inthat the clamping receptacle magazine (131) is designed as a revolver magazine (131) with a rotatable clamping receptacle carrier (144), wherein different clamping receptacles (130, 130', 130", 130"') are arranged on different outer surfaces (132, 132', 132", 132'") of the clamping receptacle carrier (133), so that by rotating the clamping receptacle carrier (133) a change of the clamping receptacles (130, 130', 130', 130"") takes place.

2. Test stand (100) according to claim 1, characterized in that the entire clamping holder magazine (131) is designed to be rotatable.

3. Test stand (100) according to at least one of claims 1 and 2, characterized in that the different clamping receptacles (130, 130', 130", 130"') on the clamping receptacle carrier (133) are additionally rotatable about a vertical axis.

4. Test stand (100) according to at least one of claims 1 to 3, characterized in that the clamping holder magazine (131) stores two, three or four different clamping holders (130, 130', 130", 130'").

5. Test stand (100) according to at least one of claims 1 to 4, characterized in that the test stand (100) is designed to automatically carry out an exchange of the plurality of different interchangeable clamping fixtures (130, 130', 130", 130"').

6. Test bench (100) according to claim 5, characterized in that the test bench (100) is designed to carry out the exchange by means of a robot or by means of a rail travel system.

7. Test bench (100) according to at least one of claims 1 to 6, characterized in that the at least one test specimen carrier (110) further comprises an electrical interface for supplying current to the axle module (10), a sensor interface for contacting sensors of the axle module (10) and a fluid interface for supplying fluid to the axle module (10), wherein the electrical interface, the sensor interface and the fluid interface are designed as a common multi-coupling (140) on each of the plurality of different interchangeable clamping receptacles (130, 130', 130", 130"') and wherein the test bench (100) is designed to automatically contact the electrical interface, the sensor interface and the fluid interface via the multi-coupling (140) in a common vertical movement of a clamping receptacle (130, 130', 130", 130"') upon reaching the test position.

8. Test stand (100) according to claim 7, characterized in that the multi-coupling (140) can be supplied via a connecting element (136, 136', 136") on the clamping support (133).

9. Test bench (100) according to at least one of claims 7 and 8, characterized in that the multi-coupling (140) can be supplied via a connecting element (136, 136', 136") on each of the clamping receptacles (130, 130', 130", 130'").

10. Test stand (100) according to at least one of claims 1 to 9, characterized in that the test stand (100) comprises a conveyor belt (170) which is designed to move the test specimen carrier (110) automatically into a test position in the test stand (100).

11. Test bench (100) according to at least one of claims 1 to 10, characterized in that the test specimen carrier (110) has interchangeable supply lines extending from the electrical interface, the sensor interface and the fluid interface for electrical contacting, sensor contacting and fluid contacting of the axle module.

12. Test bench (100) according to claim 11, characterized in that the supply lines are automatically connected to the axle module (10) when the test position is reached.

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