Test bench for testing performance of electrically drivable axle module of motor vehicle

Abstract

The invention relates to a test board (100) for testing the performance of an electrically drivable axle module (10) of a motor vehicle, comprising at least one load unit and at least one test piece carrier (110), the test piece carrier has a mechanical interface (120) for clamping the axle module (10), an electrical interface (141) for energizing the axle module (10), a sensor interface (143) for contacting a sensor of the axle module (10), and a fluid interface (142) for supplying fluid to the axle module (10). The test bench (100) according to the invention is characterized in that the mechanical interface (120) is designed as an exchangeable test piece receptacle (120), on which the axle module (10) is placed via a defined contact point (11).

Description

Technical Field

[0001] The invention relates to a test bench for testing the performance of an electrically drivable axle module of a motor vehicle according to the preamble of claim 1 . Background Art

[0002] Transmission test benches or drive train test benches for testing motor vehicle transmissions or entire motor vehicle drive trains are known from the prior art. Such test benches are usually used for quality monitoring in order to detect functional faults in the drive train at an early stage by means of a series of load tests. For example, typical functional faults are caused by exemplary components such as gears, synchronizer rings, synchronizer bodies, multi-plate clutch discs and shafts, which may excite deflections and vibrations. In the framework of such quality monitoring, acoustic properties and shifting quality are usually also tested. In addition, such test benches are also used for the development and continuous improvement of motor vehicle drive trains.

[0003] In this regard, DE 103 28 461 A1 describes a motor vehicle test bench which has a load machine for each drivable wheel of the motor vehicle. The load machine is connected to the rim of the motor vehicle wheel directly (e.g. via wheel bolts) or indirectly (e.g. via a belt drive) so that the load machine can both drive the drive train and brake the drive train. The vehicle test bench of DE 103 28 461 A1 also includes a frame structure, by which the motor vehicle and the load machine can be lifted and aligned with each other. During the test process, the motor vehicle is completely held by the frame structure so that the vehicle wheels do not have any contact with the ground.

[0004] In DE 10 2022 202 300.5, which has not yet been published by the applicant, a so-called "end of production line" test bench is known, which is used for functional testing of electric axle drives directly after assembly. For this purpose, the electric axle drive is arranged on 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, which are each in drive connection with a load motor of the test bench.

[0005] However, a disadvantage of known motor vehicle test benches is that the clamping of the test piece on the test bench is relatively complex and time-consuming and that it is often necessary to adapt the test bench, in particular the mechanical interfaces, to the specific type of test piece or drive system. Summary of the invention

[0006] The object of the present invention is to provide an improved test bench for testing the performance of an electrically drivable axle module of a motor vehicle.

[0007] This object is achieved according to the invention by a test bench for testing the performance of an electrically drivable axle module of a motor vehicle according to claim 1. Advantageous embodiments are disclosed in the dependent claims.

[0008] The invention relates to a test bench for testing the performance of an electrically drivable axle module of a motor vehicle, the test bench comprising at least one load unit and at least one specimen carrier with a mechanical interface for clamping the axle module, an electrical interface for energizing the axle module, a sensor interface for contacting sensors of the axle module, and a fluid interface for supplying the axle module with a fluid. The test bench according to the invention is characterized in that the mechanical interface is designed as an exchangeable specimen receptacle, on which the axle module can be placed via defined contact points.

[0009] The invention therefore describes a test bench suitable for testing the properties of an electrically drivable axle module of a motor vehicle. The properties that can be tested using the test bench are preferably the mechanical and acoustic properties of the axle module under various mechanical loads, wherein the load can be predetermined by at least one load unit.

[0010] The electrically drivable axle module is designed for operation in a motor vehicle, preferably a passenger car. The axle module has an electric drive motor, a reduction gear, in particular a shiftable reduction gear, and at least one output shaft. Preferably, the axle module also has two output shafts, wherein each of the two output shafts represents a wheel axle of the axle.

[0011] According to the invention, the test bench further comprises at least one load unit and at least one specimen carrier. The at least one load unit is preferably at least one electric motor. The electric motor is relatively compact, has a wide speed range, in particular compared to an internal combustion engine, and advantageously has the greatest possible torque over a wide speed range.

[0012] A load cell is provided for each output shaft of the axle module, so that the test bench usually has two load cells.

[0013] At least one load unit has a motor shaft, which can be connected to the output shaft of the axle module in a driving manner. Thus, the axle module can be subjected to a predeterminable torque and speed by the at least one load unit. The torque and the speed together represent the mechanical power that the axle module can handle, in other words the mechanical load on the axle module.

[0014] At the same time, the electric motor of the axle module can also generate a predeterminable rotational speed and a predeterminable torque, which can, for example, be directed in the opposite direction to the rotational speed and torque of the at least one load unit.

[0015] The test piece carrier is used to accommodate the axle module to be tested, which represents the test piece to be tested in the sense of the invention. The test piece carrier is necessary in order to be able to clamp the axle module in the test bench as rigidly as possible and at the same time supply it with the means or media required for operating the axle module in the test bench.

[0016] For this purpose, the test piece carrier first has a mechanical interface for clamping the axle module. In the sense of the invention, the term "clamping" is understood to mean a connection of the axle module to the test bench that is as rigid as possible, so that as few vibrations as possible occur during the test run that would interfere with the test run. 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 provided for the test. These contact points can be, for example, locations on the axle module housing, via which the axle module is also clamped in the motor vehicle when installed in the motor vehicle.

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

[0018] The test piece carrier also has an electrical interface for supplying power to the axle module or the electric motor of the axle module. For example, the electrical interface can be designed as one or more electrical sockets or electrical plugs, which can establish an electrical connection with the electric motor of the axle module or its electronic drive mechanism. Thus, the electric drive motor of the axle module can be supplied with power and operated for the test operation.

[0019] The test piece carrier also has a sensor interface for contacting the sensors of the axle module. The sensors may be, for example, 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 rotational speed sensors and one or more torque sensors. The sensor interface is preferably designed as a series of plugs or sockets, which can establish an electrical connection with the corresponding sensors of the axle module.

[0020] Furthermore, the sensor interface can also be designed for contacting one or more acoustic sensors or structure-borne sound sensors, wherein the acoustic sensors or structure-borne sound sensors can also be assigned to the test bench and do not have to be a component of the axle module. For example, the acoustic sensors or structure-borne sound sensors can be arranged on the axle module in order to monitor its acoustic properties.

[0021] Finally, the specimen carrier has a fluid connection for supplying the axle module with a fluid. The fluid can be a lubricant or a coolant, for example. The fluid connection is therefore advantageously designed as one or more fluid couplings.

[0022] Advantageously, the test piece carrier can be removed from the test bench so that the axle module can be arranged on the test piece carrier outside the test bench (and therefore relatively easily). The axle module and the test piece carrier are then positioned together in the position provided for this purpose, i.e. the test position, for the test process.

[0023] Since the test piece carrier can be advantageously removed from the test bench, the electrical interfaces, sensor interfaces and fluid interfaces of the test piece carrier are advantageously configured as interfaces that are in contact with the axle module on the one hand, and at the same time as interfaces that are in contact with the test bench at the same time. Thus, when the axle module is arranged on the test piece carrier, the interfaces are, for example, already connected to the axle module on the one hand. On the other hand, when the test position in the test bench is reached, the interfaces can also be connected to the corresponding connections of the test bench before the test process is about to begin. In other words, the electrical interfaces, sensor interfaces and fluid interfaces connect the input lines of the test bench to the docking parts of the axle module.

[0024] According to the invention, it is now provided that the mechanical interface is designed as an exchangeable test piece receptacle, onto which the axle module is placed via defined contact points.

[0025] This means firstly that the mechanical interface is not a fixed component of the test piece carrier, as is common in the prior art, but is exchangeable, i.e. can be replaced by other mechanical interfaces. Thus, depending on the axle module to be tested, only the mechanical interface of the test piece carrier can be replaced relatively quickly, simply and, in particular, inexpensively, so that the test piece carrier can be adapted to accommodate axle modules of very different designs. Thus, it is not necessary to stock a plurality of different and relatively expensive test piece carriers, but only a corresponding number of exchangeable mechanical interfaces. Instead, the test piece carrier itself can be easily adapted to a plurality of different axle drives.

[0026] By merely placing the axle module on the test piece receptacle, i.e. via the contact points, the arrangement or assembly of the axle module on the test piece carrier or the test piece receptacle is simplified compared to the prior art, since in the prior art the axle module is usually firmly clamped on the test piece carrier when it is assembled on the test piece carrier. According to the invention, however, such clamping is not necessary when the axle module is arranged on the test piece carrier, so that the arrangement or assembly on the test piece carrier is simplified and accelerated. In other words, the test piece carrier or the mechanical interface merely forms a "position nest" in which or on which the axle module to be tested is placed.

[0027] The sample receptacle can advantageously be connected to the sample carrier via a standardized connection, for example via a screw connection or a clip connection.

[0028] According to a preferred embodiment of the invention, it is provided that the test bench comprises a conveyor belt, which is configured to automatically move the specimen carrier into the test position of the test bench. In particular, the conveyor belt can be configured as a roller conveyor belt.

[0029] This results in the advantage that the test piece carrier with the axle module arranged thereon can be placed simply on the conveyor belt and then moved automatically and without further manual intervention into the test position by means of the conveyor belt. It is also advantageous that after the test process has been concluded, the test piece carrier with the axle module is automatically moved out of the test position again, so that the next test piece carrier with the axle module arranged thereon can be moved into the test position.

[0030] According to a particularly preferred embodiment of the invention, the test bench further comprises an axially movable, replaceable fixture which is configured to automatically clamp the axle module to the specimen holder when the test position is reached. Advantageously, the axle module is clamped at a defined contact point.

[0031] The axis is preferably a vertical axis, so that the gripper can be moved from above onto the axle module on the test piece receptacle.

[0032] Alternatively, the axle can also be a horizontal axle, so that the axle module can be clamped from the side accordingly. In this case, the test piece receiving portion can also have a lateral support for the axle module in particular.

[0033] This results in the advantage that the clamping of the axle module in the form of clamping the axle module is also automated and does not require manual intervention and therefore takes place relatively quickly.

[0034] Here, the fixture is a counterpart to the replaceable test piece holder and is replaceable like the test piece holder in order to be able to test a plurality of different axle modules. Therefore, the fixture is also specifically adapted to the axle module to be tested.

[0035] However, in contrast to the specimen receptacle, the gripper is not arranged on the specimen carrier, nor is it an exchangeable component of the specimen carrier, but is arranged on the test bench, ie, is arranged vertically movable or displaceable above the specimen carrier.

[0036] When the axle module on the specimen receptacle or the specimen carrier reaches the test position, for example by means of a conveyor belt, the clamp is advantageously automatically moved vertically downwards in order to clamp the axle module between the specimen receptacle and the clamp at the contact point. The axle module is thus clamped in the test bench and the test process can be carried out.

[0037] As has been found, clamping the axle module between the test piece receptacle and the fixture by means of a clamping element can provide a sufficiently rigid connection to enable testing processes to be carried out even at high rotational speeds without the testing processes being adversely affected by the mechanical vibrations that occur. For example, in this way, axle modules whose electric drive motors can provide rotational speeds of more than 18,000 rpm can be tested.

[0038] According to a particularly preferred embodiment of the invention, the test bench is designed to automatically contact the electrical, sensor and fluid interfaces when the test position is reached. The axle module can thus be tested relatively quickly and efficiently without further manual intervention.

[0039] According to a very preferred embodiment of the invention, it is provided that the electrical interface, the sensor interface and the fluid interface are constructed as a common multiple connection part. Here, a multiple connection part can be understood as connecting interfaces of different categories in a common connection part, such as interfaces for power supply, fluid and sensor connection, to achieve common contact. The above-mentioned interfaces are preferably positioned in a relatively defined arrangement relative to each other in the connection part, so that a connection partner with a mirror-image positioning of the interface can contact the connection part and also contact all interfaces at the same time. Therefore, all three interfaces can be contacted at once via the multiple connection part without having to contact each interface separately. This reduces the preparation time for the test process of the axle module.

[0040] According to another very preferred embodiment of the invention, it is provided that the electrical interface, the sensor interface and the fluid interface are in contact with a vertical movement. Accordingly, the multiple connection is also advantageously in contact with a vertical movement. Since the test bench has a device for vertical adjustability for the vertical movement of the fixture, such as a hydraulic cylinder or an electrically adjustable threaded spindle for moving the carrier, the electrical interface, the sensor interface and the fluid interface or the multiple connection can also be in contact via the device for vertical adjustability.

[0041] According to another very preferred embodiment of the invention, it is provided that the test bench is designed to vertically move the multi-coupling and the clamp with a common vertical movement in order to close the multi-coupling and clamp the axle module. Thus, it is not necessary to provide separate mechanisms for the vertical adjustment of the multi-coupling and the vertical adjustment of the clamp. Thus, the multi-coupling and the clamp can also be moved vertically simultaneously, which speeds up the testing process.

[0042] According to another preferred embodiment of the invention, the test piece carrier has replaceable input lines from the electrical interface, the sensor interface and the fluid interface for electrical, sensor and fluid contacting of the axle module. Since the input lines are replaceable, they can be replaced as required in a similar manner to the test piece holder and the fixture and matched to the axle module to be tested.

[0043] The input line is preferably configured as a cable, a wire or a hose. Advantageously, the input line has a standardized connection portion, such as a socket or a plug, at the first end for connecting the electrical interface, the sensor interface and the fluid interface. However, at the other end, which is configured to be connected to the corresponding connection portion of the axle module, the input line has a connection portion specifically matched to the axle module, such as a specific plug or a socket. Therefore, the axle module can be connected to the interface of the specimen carrier by selecting the corresponding input line, without the need for completely different specimen carriers that are matched to the axle module respectively.

[0044] According to a particularly preferred embodiment of the invention, it is provided that the input line is automatically connected to the axle module when the test position is reached. This can advantageously be done by one or more manipulators, which can in particular be components of the test bench. The input line can thus also be connected to the axle module without manual intervention, which in turn reduces the preparation time for the actual test process.

[0045] According to another preferred embodiment of the invention, the test bench has a fixture library for storing a plurality of different replaceable fixtures, wherein the test bench is designed for automatically replacing the fixtures. For example, the fixture library can store fixtures for the types of axle modules that are usually tested with the aid of the test bench. The next axle module type to be tested can then be predetermined by corresponding operator input, for example on a PC assigned to the test bench or a control unit assigned to the test bench, and the test bench then automatically selects the corresponding fixture from the fixture library.

[0046] In particular, the fixture magazine can be designed as a guide or a rod on which a plurality of different fixtures are arranged in a slide-displaceable manner. The fixture required in each case can then be positioned in a test position above the axle module to be tested.

[0047] Alternatively, different grippers can also be advantageously selected by means of a robot, removed from a storage location and arranged on the test bench.

[0048] According to a particularly preferred embodiment of the invention, it is provided that the test bench has a seat for a specimen carrier in the area of ​​the test position, wherein the conveyor belt is arranged above the seat and has a recess for the seat, wherein the specimen carrier is longer and / or wider than the recess, wherein the conveyor belt has a spring device, and wherein the test bench is designed to press the specimen carrier against the seat by means of a clamp against the spring device.

[0049] The test bench therefore has a support on which the specimen carrier can be placed in principle. The support is located below the specimen carrier in the area of ​​the test position. Since the specimen carrier is initially placed on the conveyor belt, the conveyor belt is arranged in the vertical direction between the specimen carrier and the support. Therefore, the conveyor belt must have a recess through which the specimen carrier can come into contact with the support. The conveyor belt is held horizontally in the area of ​​the test position by a spring device. Since the test bench now exerts a vertical force on the axle module (preferably in the range of the axle module being clamped between the specimen receptacle and the fixture placed vertically on the axle module), a force is also exerted on the conveyor belt and against the spring device. The magnitude of this force is determined in such a way that it presses the axle module and the conveyor belt downwards against the spring device until the support protrudes from below through the recess of the conveyor belt and comes into contact with the specimen carrier from below.

[0050] The support is preferably made of cast concrete or cast mineral concrete.

[0051] The test piece is thus attached to the test bench in a relatively rigid manner and can be tested at high or very high speeds without vibrations occurring which would interfere with the test process.

[0052] According to another preferred embodiment of the present invention, in order to establish a drive connection between each load unit and each output shaft of the axle module, the test bench has an adapter shaft bin, which is used to store a plurality of different replaceable adapter shafts, wherein the test bench is configured to automatically replace the adapter shaft. Therefore, the adapter shaft is used to establish a drive connection between the load unit and the output shaft of the axle module by connecting the motor shaft of the load unit to the output shaft of the axle module in a rotationally fixed manner. Here, the first end of each adapter shaft has a standardized connection portion, such as a plug-in connection portion, so that the adapter shaft can be connected to the motor shaft of the respective load unit in a rotationally fixed manner. The second end of the adapter shaft is specifically matched to the type of the axle module to be tested. By being configured to store a plurality of different replaceable adapter shafts, the test bench can be used to test a plurality of different types of axle modules. For example, the adapter shaft can be automatically replaced by a manipulator according to information input by an operator through a PC or a control unit. Therefore, the test bench can also be relatively quickly and simply matched to different output shafts of different types of axle modules.

[0053] According to another preferred embodiment of the invention, it is provided that at least one specimen carrier has at least one centering element, wherein the test bench is designed to automatically align the at least one specimen carrier by means of the at least one centering element when the test position is reached. For example, the centering element can be designed as a pin or a bore.

[0054] The specimen carrier advantageously has two centering elements.

[0055] By means of the centering element, the specimen carrier can be introduced precisely into the test position in the required orientation in order to automatically contact the multiple couplings and the output shaft of the axle module.

[0056] The centering itself is preferably achieved by bringing the centering element into engagement with a counter-element (eg a bore which contacts a particularly conical pin) and thereby aligning it.

[0057] Therefore no manual operation is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The present invention will be explained exemplarily below with reference to the embodiments shown in the accompanying drawings. In the accompanying drawings:

[0059] Figure 1 The structure of a test bench according to the invention is shown by way of example and schematically, the test bench being used to test the performance of an electrically drivable axle module of a motor vehicle;

[0060] Figure 2 Show Figure 1 Test bench, but with clamped axle modules;

[0061] Figure 3 Also shows Figure 1 The test bench, but from the side;

[0062] Figure 4 by Figure 3 The side view shows Figure 1 Test bench, but with clamped axle modules;

[0063] Figure 5 A further possible configuration of the test bench according to the invention is shown by way of example and schematically;

[0064] Figure 6 A possible design of a section of a test bench according to the invention is shown by way of example and schematically;

[0065] Figure 7 A possible configuration of a sample carrier is shown exemplarily and schematically;

[0066] Figure 8Another possible configuration of the test bench according to the invention is shown by way of example and schematically; and

[0067] Fig. 9 Another possible embodiment of the test bench according to the invention is shown by way of example and schematically.

[0068] The same objects, functional units and comparable components in all figures are marked with the same reference numerals. Unless otherwise expressly or implicitly stated in the specification, these objects, functional units and comparable components are implemented identically in terms of their technical features. DETAILED DESCRIPTION

[0069] Figure 1 The structure of a test bench 100 according to the present invention is shown schematically and exemplarily in a front view, and is used for testing a motor vehicle ( Figure 1 The performance of the electrically drivable axle module 10 (not shown in FIG. 1 ) is determined by measuring the performance of the electrically drivable axle module 10. By way of example, the test bench comprises two load cells (not shown), each of which is designed as an electric motor and whose motor shafts (also not shown in FIG. 1 ) are connected to the load cells. Figure 1 ) via an adapter shaft (also not shown) which is designed for this purpose Figure 1 ) are connected to the output shaft of the axle module 10 (also not shown) in a rotationally fixed manner. Figure 1 ) connection.

[0070] also, Figure 1 The test bench 100 also includes a specimen carrier 110, wherein the specimen carrier 110 itself includes a mechanical interface 120 for clamping the axle module 10, an electrical interface 141 for energizing the axle module 10, a sensor interface 143 for contacting the sensors of the axle module 10, and a fluid interface 142 for supplying fluid to the axle module 10. However, for the sake of clarity, Figure 1 Only the mechanical interface 120 is shown.

[0071] It can be seen that the axle module 10 is placed on a mechanical interface 120 which is designed as a replaceable test piece receptacle 120. For this purpose, the axle module 10 has a series of defined contact points 11. The test piece receptacle 120 is adapted to the specific geometry of the axle module 10 so that the axle module 10 can be clamped on the contact points 11 provided for testing or can first be placed on the test piece receptacle 120 by means of the contact points 11. The contact points 11 of the axle module 10 are, for example, those contact points 11 by which the axle module 10 is also clamped on the motor vehicle when it is installed in the motor vehicle.

[0072] from Figure 1 It can also be seen that the test bench 100 also includes a device that can move along a vertical axis (in Figure 1The clamp 130 is displaceable here by a carrier 160. Like the specimen holder 120, the clamp 130 is also designed for clamping the axle module 10 in the test bench 100, for example by means of a clamping element, in that the clamp 130 is moved vertically downward from above in order to clamp the axle module 10 at a defined contact point 11.

[0073] If the axle module 10 is already arranged on the test piece receptacle 120 and the test piece receptacle 120 together with the test piece carrier 110 is already arranged in the test bench 100 , the clamp 130 can be automatically moved vertically downwards in order to clamp the axle module 10 .

[0074] Figure 1 Also shown is a conveyor belt 170, which is configured as a roller conveyor belt 170, for example. The conveyor belt 170 has a spring device 180 ( Figure 1 ), which pushes the conveyor belt 170 together with the sample carrier 110 arranged thereon and the sample receiving portion 120 upward.

[0075] Both the test piece receptacle 120 and the fixture 130 are replaceable, that is, different test piece receptacles 120 can be arranged on the test piece carrier 110, which are respectively matched to different axle modules 10. Therefore, it is advantageous that a large number of relatively expensive test piece carriers 110 each with a fixedly arranged mechanical interface 120 do not need to be prepared in order to be able to test axle modules 10 of different types in the test bench 100.

[0076] In a similar manner, the fixture 130 is also exchangeable in order to be able to clamp and test different types of axle modules 10 in the test bench 100 .

[0077] Figure 2 Show Figure 1 The test bench 100 of FIG. 1 is a test bench 100 of FIG. 1 , but with a clamped axle module 10 . It can be seen that the carrier 160 with the clamp 130 is moved vertically downwards in order to clamp the axle module 10 on the defined contact point 11 provided for this purpose between the clamp 130 and the test piece receptacle 120 .

[0078] Since the clamp 130 is moved vertically downwards in order to clamp the axle module 10 in the test bench 100, a corresponding pressure acts from above on the spring device 180 of the conveyor belt 170, so that it is pressed vertically downwards against the spring force of the spring device 180 and is placed from above. Figure 2 The marked circular arrows indicate the force flow at the contact point 11 through the test piece receptacle 110 and the clamp 130 for clamping the axle module 10 .

[0079] Figure 3It also shows Figure 1 100, but in side view. Figure 3 In the side view, Figure 1 Compared to the front view of the axle module 110, an additional multi-connection 140 can be seen, which is arranged above the specimen carrier 110. The multi-connection 140 combines interfaces 141, 142 and 143 for power supply and fluid and sensor connection of the axle module 10 for common contact. These interfaces 141, 142, 143 are positioned in the multi-connection 140 in a defined arrangement relative to one another, so that a counterpart connector 150 with a mirror-image positioning of the interfaces 141, 142, 143 can contact the multi-connection 140, so as to thereby simultaneously connect all interfaces 141, 142, 143 in the multi-connection 140.

[0080] It can be seen that when the clamp 130 is moved vertically downward, the multiple coupling portion 140 is connected with the counter coupling 150 , because the clamp 130 and the counter coupling 150 are arranged on the same carrier 160 of the test bench 100 .

[0081] Figure 3 Another possible arrangement of the multiple coupling 140' is shown in dashed lines. In this case, the multiple coupling 140' is not arranged above the specimen carrier 110, but below the specimen carrier 110. The corresponding counter coupling 150' is also shown in dashed lines and is arranged below the conveyor belt 140. In this case, the clamp 130 exerts sufficient force on the axle module 10 and thus on the specimen carrier 110 to resist the spring device 180 ( Figure 3 When the multiple coupling part 140' is moved in the direction of the counter coupling part 150' by the spring force of the coupling part 140 (not shown) and thus the multiple coupling part 140' is connected to the counter coupling part 150', the multiple coupling part 140' is connected to the counter coupling part 150'.

[0082] Figure 4 by Figure 3 The side view shows Figure 1 , but with a clamped axle module 10. Furthermore, in the figure, the multiple coupling 140 is connected to a counter coupling 150, or the alternative multiple coupling 140' shown in dashed lines is connected to a counter coupling 150'.

[0083] Figure 5 A further possible embodiment of a test bench 100 according to the invention is shown by way of example and schematically, and is used for testing a motor vehicle ( Figure 5 The performance of the electrically drivable axle module 10 (not shown). Figures 1 to 4 compared to, Figure 5In particular, a support 190 is shown which consists, for example, of four ribs, each of which is made of a mineral casting. A scraper 200 is arranged at the upper end of the ribs of the support 190 and is designed, for example, as a brush 200 in order to clean dirt from the underside of the specimen carrier 110 when the specimen carrier 110 is moved onto the support 190 by the conveyor belt 170. It is also conceivable to design the scraper 200 as a rubber lip. If the carrier 160 ( Figure 5 If the test fixture 130 (not shown) is now moved vertically downwards in order to move the clamp 130 downwards and clamp the axle module 10 in the test bench 100, a force will also act on the specimen receptacle 120, the specimen carrier 110 and the conveyor belt 170. This force pushes the conveyor belt 170 downwards against the spring force of the spring device 180 until the specimen carrier 110 is located on the support 190.

[0084] Figure 6 A possible design of a section of a test bench 100 according to the invention, namely a support 190 consisting of four ribs as well as a conveyor belt 170 and a spring device 180 is shown by way of example and schematically in a top view from above.

[0085] It can be seen that the drive belt 170, which is, for example, a roller drive belt 170 with rollers 171, has a recess 172. The support 190 can be seen through the recess 172. The drive belt 170 is normally held in a position above the support 190 by the spring device 180. However, if a corresponding vertical downward force is applied, the drive belt 170 will be pushed downward against the spring force of the spring device 180.

[0086] Figure 7 A possible configuration of a test carrier 110 is shown by way of example and schematically, and the test carrier has a test receptacle 120 as well as an electrical interface 141, a fluid interface 142 and a sensor interface 143. It can be seen that each interface 141, 142, 143 has two sockets by way of example, wherein the first socket of each interface 141, 142, 143 can respectively deliver current or voltage or fluid to the axle module 10, and the second socket of each interface 141, 142, 143 can respectively realize return flow. For this purpose, the first socket and the second socket of each interface 141, 142, 143 are respectively connected to the corresponding connection of the axle module 10 via a connection mechanism suitable therefor, such as a matching cable, a suitable hose or a suitable wire with a matching plug. The connection mechanism is replaceable like the test receptacle 120, so that the corresponding suitable connection mechanism 120 can be selected depending on the axle module 10 to be tested and connected to the first and second sockets of the interfaces 141, 142 and 143. The axle module 10 rests with the contact point 11 on the test piece receptacle 120 .

[0087] For example, the interfaces 141 , 142 , 143 form a multiple connection 140 ′ which can be contacted from below by the test bench 100 with corresponding counter-connectors 150 ′ in order to realize an electrical supply or a supply fluid or a sensor signal connection for the axle module 10 via the interfaces 141 , 142 , 143 .

[0088] Figure 8 Another possible configuration of a test bench 100 according to the invention is shown by way of example and schematically, and is used for testing a motor vehicle ( Figure 8 The performance of the electrically drivable axle module 10 (not shown).

[0089] Figure 8 The test bench 100 has a multiple connection 140', which can be contacted from below by means of a mating connection 150'. In addition, the test bench 100 has a fixture magazine 131, which is used to store three different replaceable fixtures 130, 130', 130", wherein the test bench 100 is designed for the automated replacement of the fixtures 130, 130', 130". For the automated replacement of the fixtures 130, 130', 130", these can be moved laterally along a platform 132, so that the fixture 130, 130', 130" required or matched to the axle module 10 can be positioned above the axle module and can therefore be used for the test process.

[0090] Fig. 9 Another possible configuration of a test bench 100 according to the invention is shown by way of example and schematically, and is used for testing a motor vehicle ( Fig. 9 The performance of the electrically drivable axle module 10 (not shown).

[0091] Fig. 9 The test bench 100 with Figure 8 The difference of the test bench 100 is that the fixture library 131 ( Fig. 9 The construction method is not shown in FIG. Figure 8 The difference between the test bench 100 is that Fig. 9 The test bench 100 has a robot 133 which can take out different fixtures 130 , 130 ′, 130 ″ from a fixture magazine 131 and arrange them on a carrier 160 .

[0092] Reference numerals list

[0093] 10 Axle module

[0094] 11 Contact Area

[0095] 100 Test Benches

[0096] 110 Specimen carrier

[0097] 120 Specimen receiving part, mechanical interface

[0098] 130 Clamp

[0099] 130'' Clamp

[0100] 130'' Clamp

[0101] 130''' fixture

[0102] 131 Fixture Library

[0103] 132 Platform

[0104] 133 Robot

[0105] 140 Multiple connection parts

[0106] 140 Multiple connection parts

[0107] 141 Electrical interface

[0108] 142 Fluid interface

[0109] 143 Sensor interface

[0110] 150 Mating connection

[0111] 150' Mating Connectors

[0112] 160 Carrier

[0113] 170 transmission belt, roller transmission belt

[0114] 171 rollers

[0115] 172 recess

[0116] 180 Spring device

[0117] 190 Support

[0118] 200 Scraper, brush, rubber lip

Claims

1. A test bench (100) for testing the performance of an electrically drivable axle module (10) of a motor vehicle, the test bench comprising at least one load cell and at least one specimen carrier (110), the specimen carrier having a mechanical interface (120) for clamping the axle module (10), an electrical interface (141) for energizing the axle module (10), a sensor interface (143) for contacting a sensor of the axle module (10), and a fluid interface (142) for supplying a fluid to the axle module (10), It is characterized in that The mechanical interface (120) is designed as an exchangeable test piece receptacle (120), on which the axle module (10) can be placed via defined contact points (11).

2. The test bench (100) according to claim 1, It is characterized in that The test bench (100) comprises a conveyor belt (170) which is configured to automatically move the specimen carrier (110) to a testing position in the test bench (100).

3. The test bench (100) according to claim 2, It is characterized in that The test bench (100) further comprises an axially movable and replaceable fixture (130, 130', 130''), which is configured to automatically clamp the axle module (10) on the test piece holder (120) when the test position is reached.

4. The test bench (100) according to at least one of claims 2 and 3, It is characterized in that The test bench (100) is configured to automatically contact the electrical interface (141), the sensor interface (143) and the fluid interface (142) when the test position is reached.

5. The test bench (100) according to claim 4, It is characterized in that The electrical interface (141), the sensor interface (143) and the fluid interface (142) are designed as a common multiple connection (140, 140').

6. The test bench (100) according to at least one of claims 4 and 5, It is characterized in that The electrical interface (141), the sensor interface (143) and the fluid interface (142) are in contact during the vertical movement.

7. The test bench (100) according to at least one of claims 4 to 6, It is characterized in that The test bench is configured to vertically move the multiple coupling (140) and the clamp (130) in a common vertical movement in order to close the multiple coupling (140) and clamp the axle module (10).

8. The test bench (100) according to at least one of claims 1 to 7, It is characterized in that The specimen carrier (110) has replaceable input lines extending from the electrical interface (141), the sensor interface (143) and the fluid interface (142), the input lines being used for electrical contact, sensor contact and fluid contact with the axle module.

9. The test bench (100) according to claim 8, It is characterized in that When the test position is reached, the input line is automatically connected to the axle module (10).

10. The test bench (100) according to at least one of claims 1 to 9, It is characterized in that The test bench (100) has a fixture magazine (131) for storing a plurality of different replaceable fixtures (130, 130', 130''), wherein the test bench (100) is configured to automatically replace the fixtures (130, 130', 130'').

11. The test bench (100) according to at least one of claims 2 to 10, It is characterized in that The test bench (100) has a support (190) for the specimen carrier (110) in the area of ​​the test position, wherein the conveyor belt (170) is arranged above the support (190) and has a recess (172) for the support (190), wherein the specimen carrier (110) is longer and / or wider than the recess (190), wherein the conveyor belt (170) has a spring device (180), and wherein the test bench (100) is designed to press the specimen carrier (110) onto the support (190) against the spring device (180) by means of the clamp (130, 130', 130'').

12. The test bench (100) according to at least one of claims 1 to 11, It is characterized in that In order to establish a drive connection between each load unit of the axle module (10) and each output shaft, the test bench (100) has an adapter shaft magazine for storing a plurality of different replaceable adapter shafts, wherein the test bench (100) is designed for automatically replacing the adapter shafts.

13. The test bench (100) according to at least one of claims 1 to 12, It is characterized in that At least one specimen carrier (110) has at least one centering element, wherein the test bench (100) is designed to automatically align the at least one specimen carrier (110) by means of the at least one centering element when the test position is reached.

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