Drive unit for a test bench for testing an electric axle drive module for a motor vehicle, and test bench

Abstract

The invention relates to a drive unit (100) for a test bench (220) for testing an electric axle drive module (240) for a motor vehicle, comprising an electric drive motor (110) with a motor shaft (111) and a transmission (120) which is drivingly connected downstream of the drive motor (110) and has an output shaft (121). The drive unit (100) according to the invention is distinguished in that the transmission (120) provides between the motor shaft (111) and the output shaft (121) a radial offset greater than half the width of the drive motor (110) and in that the transmission (120) can be pivoted about the motor shaft (111) or about another shaft. The invention furthermore relates to a corresponding test bench.

Description

[0001] Drive unit for a test bench for testing an electric axle drive module for a motor vehicle and test bench

[0002] The invention relates to a drive unit for a test bench for testing an electric axle drive module for a motor vehicle according to the preamble of claim 1 and a corresponding test bench.

[0003] Transmission test benches or drivetrain test benches for testing motor vehicle transmissions or complete motor vehicle drivetrains are generally known in the state of the art. Such test benches are typically used for quality control 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] Electrically driven axle modules pose a particular challenge in this context. Due to their design, they typically have a small radial distance between a transmission input shaft and a transmission output shaft, making access to both shafts difficult. In addition, such electric axle modules typically require comparatively high input speeds, which places correspondingly high demands on the vibration damping properties and rigidity of the test bench.

[0005] DE 10 2022 202 300 A1 discloses a test bench for a drive train of a motor vehicle, comprising a first load motor, a second load motor, and a base frame with a test specimen mount for mounting a test specimen. The test bench further comprises a first motor mount for mounting the first load motor and a second motor mount for mounting the second load motor. A first motor shaft of the first load motor and a second motor shaft of the second load motor are connectable to shafts of the test specimen, so that the output shafts of the test specimen can be subjected to torques and speeds.

[0006] DE 10 2022 202 301 A1 also discloses a test bench for a drive train of a motor vehicle, comprising at least one electric load motor and a support frame. The at least one electric load motor is arranged with an axial end face on a motor mount of the support frame. The motor mount is vertically and horizontally adjustable for adjusting the position of the at least one electric load motor.

[0007] However, the known automotive test benches have the disadvantage that, due to the closely spaced shafts and the high speeds, they generally only allow testing of an electric axle drive module if the axle drive module is driven by its own electric motor belonging to the axle drive module.

[0008] It is an object of the present invention to propose an improved drive unit for a test bench for testing an electric axle drive module for a motor vehicle.

[0009] This object is achieved according to the invention by the drive unit for a test bench for testing an electric axle drive module for a motor vehicle according to claim 1. Advantageous embodiments emerge from the subclaims.

[0010] The invention relates to a drive unit for a test bench for testing an electric axle drive module for a motor vehicle, comprising an electric drive motor and a transmission connected downstream of the drive motor, having an input shaft and an output shaft. The invention thus describes a drive unit designed to drive an electric axle drive module for a test procedure on a test bench.

[0011] The test bench is designed as a powertrain test bench and is suitable for testing an electric axle drive module before the electric motor required to drive it is mounted on it.

[0012] Since the test bench is designed to test the electric axle drive module, the electric axle drive module is also referred to as the test object in the following.

[0013] The electric axle drive module, in turn, is intended and suitable for driving a motor vehicle.

[0014] When fully assembled, electric axle drive modules typically comprise an electric motor, a transmission, a differential, and two output shafts, which act as the wheel shafts during operation of the axle module. Due to their intended use for driving vehicles, and particularly for installation on vehicles near their rear axle, they are typically designed to be comparatively compact, so that an input shaft of the axle drive module's transmission has only a very small radial distance from the axle drive module's output shafts.

[0015] The drive unit according to the invention is therefore suitable, due to its design and in particular construction, for establishing a drive connection to an input shaft of the transmission of the axle drive module despite the confined space conditions.

[0016] The drive unit comprises an electric drive motor and a transmission downstream of the drive motor, featuring an input shaft and an output shaft. The transmission downstream is a component of the drive unit and is provided in addition to the transmission of the axle drive module.

[0017] The electric drive motor is therefore designed as an electric motor. Electric motors are comparatively compact, have a wide speed range, especially compared to combustion engines, and advantageously exhibit maximum torque over a wide speed range.

[0018] Advantageously, the drive motor has a motor housing which encloses the drive motor and in particular delimits it radially.

[0019] A motor shaft of the drive motor preferably projects axially out of the motor housing and can be connected to the input shaft of the gearbox via a coupling, so that the drive motor can drive the downstream gearbox via the input shaft.

[0020] The drive motor is preferably designed to provide speeds of up to 20,000 rpm.

[0021] According to the invention, it is now provided that the downstream transmission provides a radial offset between the input shaft and the output shaft which is greater than half the width of the drive motor and that the transmission is pivotable about the input shaft or about another shaft.

[0022] A radial offset refers to a radial spacing of the input shaft from the output shaft of the downstream transmission. This means that the input shaft and the output shaft do not share a common axis, but are radially spaced and, in particular, parallel.

[0023] The offset or spacing between the input shaft and the output shaft is greater than half the width of the drive motor. Since the input shaft is coupled to the motor shaft of the drive motor via a coupling and is thus arranged concentrically to the motor shaft, which represents the radial center of the drive motor or the motor housing of the drive motor, the output shaft is accordingly located on an axis that does not intersect the motor housing of the drive motor. This means that the output shaft is freely accessible from both axial directions. In addition, the downstream gearbox - and thus also the output shaft - can be pivoted on a circular path around the input shaft or around another shaft of the downstream gearbox. This means that the output shaft can, for example, be rotated depending on the test object or the test load.Depending on the test bench, the height can be adjusted very easily along the circular path in order to enable a drive coupling between the output shaft of the downstream gearbox and the input shaft of the gearbox of the axle drive module.

[0024] The other shaft is a shaft in the downstream transmission, located between the input and output shafts. One or more intermediate gears can be located on this other shaft, for example, provided the downstream transmission is designed as a spur gear.

[0025] However, the other shaft is not mandatory according to the invention; it is also conceivable for the downstream transmission to comprise only the input shaft and the output shaft. In this case, spur gears on the input shaft and output shaft can mesh directly with each other, or the input shaft and output shaft can be connected via another suitable drive mechanism.

[0026] If the downstream transmission is designed to pivot about a different shaft than the input shaft, the transmission housing advantageously has an articulated joint at this point and is thus designed as a two-part transmission housing to mechanically enable pivoting about this other shaft. Thus, one transmission part behind the articulated joint pivots about the other shaft against another transmission part in front of the articulated joint.

[0027] The articulated joint is advantageously designed to be oil-tight to prevent leakage of lubricating oil.

[0028] If the downstream transmission can pivot around the input shaft, no articulated joint is required, since the transmission then pivots as a single unit. The downstream transmission can, for example, be designed to reduce an input speed. However, it is also conceivable and preferred for the downstream transmission to be designed to increase the input speed. Finally, it is also conceivable for the downstream transmission to be designed to output the input speed unchanged via the output shaft as the output speed.

[0029] The invention thus describes a drive unit whose output shaft can be pivoted as required in order to enable flexible adaptation to different test objects and different test benches.

[0030] According to a preferred embodiment of the invention, it is provided that the downstream transmission provides the radial offset via a plurality of meshing spur gears, a belt drive or a chain drive.

[0031] While a belt drive and a chain drive are comparatively inexpensive to manufacture, the use of a large number of meshing spur gears enables higher power density, improved acoustic behavior in terms of reduced noise emissions, and comparatively higher peripheral speeds.

[0032] According to a further preferred embodiment of the invention, it is provided that the downstream transmission can be pivoted in a stepped or continuously variable manner around the input shaft of the downstream transmission.

[0033] For example, a detent can be provided that specifies fixed steps for pivoting. This has the advantage that the downstream gear can be pivoted relatively easily and, in particular, can be locked in a pivoted position very easily.

[0034] If the downstream gearbox is continuously pivotable, any desired pivoting position can be assumed, but securing it in the achieved pivoting position is often more complex. Depending on the weight and dimensions of the downstream gearbox, pivoting the downstream gearbox can be done manually or using suitable tools, such as a gearbox, a spindle drive, or a crane.

[0035] It is also conceivable that the pivoting is carried out by means of a separate electric motor provided for this purpose.

[0036] According to a further preferred embodiment of the invention, it is provided that the downstream gear can be fixed in a pivoting position by means of clamps.

[0037] This design is particularly suitable for continuously pivoting the downstream transmission. Clamping using one or more screw connections has proven particularly suitable and reliable for preventing vibrations in the drive unit, and especially in the downstream transmission, even at high speeds, and for ensuring the downstream transmission is securely held in the pivoted position.

[0038] According to a further preferred embodiment of the invention, it is provided that the output shaft has a first output flange at a first axial end and a second output flange at a second axial end.

[0039] Each of the output flanges represents an interface for the possible coupling of the output shaft of the downstream transmission to the input shaft of the electric axle drive module.

[0040] This greatly simplifies the coupling of the output shaft of the downstream transmission to the input shaft of the electric axle drive module.

[0041] Since both axial ends of the output shaft of the downstream gearbox of the drive unit each have an output flange, the coupling can also be made either via the first or the second end, which makes the arrangement of the drive unit in a corresponding test bench variable and allows it to be adapted according to further boundary conditions.

[0042] According to a further preferred embodiment of the invention, it is provided that the output shaft has a compensating element, wherein the compensating element is designed for coupling to an input shaft of the axle drive module.

[0043] The compensating element is primarily used to compensate for a slight axial offset between the output shaft of the downstream gearbox and the input shaft of the axle drive module.

[0044] The compensating element can be designed, for example, as a constant velocity joint or as an offset coupling.

[0045] According to a further preferred embodiment of the invention, it is provided that the output shaft has a torque measuring flange.

[0046] This makes it possible to measure the torque applied by the drive unit to the axle drive module with considerable precision. This allows the actual load on the axle drive module to be determined and controlled more precisely.

[0047] Preferably, the output shaft is non-rotatably coupled to the input shaft of the axle drive module via the torque measuring flange. The torque measuring flange thus represents a connecting element through which the entire drive power is transmitted.

[0048] Preferably, the rotational speed of the drive motor is also detected, for example, via its control electronics, in particular via its inverter. Alternatively, the rotational speed of the drive motor can also be measured using a tachometer directly on the motor shaft of the drive motor, for example, by extending the motor shaft such that it protrudes sufficiently far from the motor housing on the b-side of the drive motor to accommodate the tachometer. From the known rotational speed and the known torque, the mechanical power applied to the axle drive module can then be determined, for example.

[0049] According to a further preferred embodiment of the invention, it is provided that the input shaft extends axially through the downstream transmission and represents a further output on a side facing away from the drive motor.

[0050] Preferably, an output flange is also arranged at the axial end of the side of the input shaft facing away from the drive motor, so that the input shaft can also be used as an output in a simple manner.

[0051] The drive unit thus provides additional output, which increases the flexibility of the drive unit and its possible uses.

[0052] According to a further preferred embodiment of the invention, it is provided that the drive unit is designed to pivot the downstream transmission about the input shaft by at least 180°.

[0053] The downstream gearbox can thus be pivoted at least along an imaginary semicircle around the input shaft, so that it can be moved, for example, from the radial left side to the radial right side of the drive motor.

[0054] This makes it possible, among other things, to establish a coupling between the output shaft of the downstream transmission and the input shaft of an axle drive module, which is located on the side of the axle drive module facing away from the downstream transmission. This is particularly advantageous if the output shaft of the downstream transmission has an output flange at only one axial end. By rotating the drive unit together with the downstream transmission 180° around its vertical axis and simultaneously pivoting the downstream transmission 180° along its circular path around the input shaft, the output flange can be aligned toward the input shaft of the axle drive module to enable coupling.

[0055] According to a further preferred embodiment of the invention, it is provided that the downstream transmission has an external oil supply.

[0056] This means the downstream transmission does not require its own oil sump or oil pump, which particularly facilitates pivoting through large angles, such as 180° and more. Furthermore, the downstream transmission remains comparatively lightweight, which facilitates quick and easy pivoting.

[0057] In addition, a comparatively more efficient cooling system can be used, which relies on a larger heat exchanger and a more powerful pump, since these components do not have to be structurally integrated into the downstream gearbox and no comparatively tight installation space requirements have to be taken into account.

[0058] Advantageously, the external oil supply is assigned exclusively to the downstream gearbox, so it does not cool or lubricate any other components.

[0059] According to a further preferred embodiment of the invention, the output shaft of the downstream transmission is height-adjustable along a circular path of + / - 300 mm. This height adjustability is, in particular, continuously adjustable.

[0060] This offers the advantage that the output shaft of the downstream transmission can be very flexibly adjusted to the respective requirements, especially to the height of the test specimen's input shaft on the test bench. For example, the test specimen can initially be gradually adjusted in height on the test bench using connection blocks. Subsequent fine adjustment is then performed using the height adjustment of the output shaft.

[0061] According to a further preferred embodiment of the invention, it is provided that an axis of the output shaft is spaced at least 80 mm from a radially outer end of a transmission housing.

[0062] The drive unit is designed such that the distance between the radially outer end of the gearbox housing, i.e., the point of the downstream swivel gearbox furthest from the swivel axis, and the axis of the output shaft is only 80 mm. This offers the advantage that even very compact axle drive modules can be tested, with a radial distance of at least 80 mm between the input shaft of the axle drive module and an output shaft of the axle drive module.

[0063] The invention further relates to a test bench comprising a drive unit according to the invention, a first output unit and a second output unit as well as a test specimen holder, wherein the first output unit comprises an electric drive motor with a motor shaft, wherein the second output unit comprises an electric drive motor with a motor shaft, wherein the test bench is designed to receive an electric axle drive module in the test specimen holder in such a way that the output shaft of the downstream transmission of the drive unit can be coupled to an input shaft of the electric axle drive module, that the motor shaft of the drive motor of the first output unit can be coupled to a first output shaft of the electric axle drive module and that the motor shaft of the drive motor of the second output unit can be coupled to a second output shaft of the electric axle drive module.

[0064] The first and second output units are each designed as electric motors, which provides a wide speed range and consistently high torque. Via their motor shafts, they are connected to an output shaft of the electric motor, without the need for a gearbox.

[0065] Axle drive module can be coupled.

[0066] Thus, the first and second output units can generate a load on the electric axle drive module to be tested by applying a predeterminable torque to the output shafts of the electric axle drive module, which counteracts a rotational speed or torque that the drive unit applies to the input shaft of the electric axle drive module.

[0067] Preferably, the first and second output units are each designed as permanent-magnet synchronous motors with at least twelve magnetic pole pairs. Such synchronous motors are also known as so-called synchro-torque motors. This results in the advantage that the load motor can be comparatively compact and, in particular, axially short and slow-rotating, yet can still provide high torque. In particular, the first and second load motors can provide speeds of up to 3,000 rpm.

[0068] The test specimen holder is advantageously designed to be longitudinally, laterally, and / or vertically adjustable. By making the test specimen holder longitudinally, laterally, and vertically adjustable, the electric axle drive module can be adapted with considerable flexibility to the orientation of the drive unit and the two output units.

[0069] Alternatively, the test specimen holder can be adjusted in height in steps exclusively using connection blocks. The connection blocks can be used as support elements and can be firmly connected to the test specimen holder and the test bench, for example, using screws.

[0070] The test specimen holder enables a fixed arrangement of the electric axle drive module to be tested on the test bench, in particular, it prevents the occurrence of vibrations in the electric axle drive module during the test process. According to a preferred embodiment of the invention, the test bench further comprises a rail system or a cast bed with grooves to enable transverse adjustment of the drive unit and / or to enable longitudinal adjustment of the drive unit, the first output unit, and the second output unit.

[0071] This allows the drive unit as well as the first and second output units to be aligned very flexibly to enable precise clamping of the test specimen in the test bench.

[0072] According to a particularly preferred embodiment of the invention, it is provided that the transverse adjustability is at least + / - 300 mm.

[0073] Such transverse adjustability has proven sufficient in practice to reliably couple different test specimens to the drive unit or to the first and second output units.

[0074] The invention is explained below by way of example with reference to embodiments shown in the figures.

[0075] They show:

[0076] Fig. 1 shows, by way of example and schematically, a possible embodiment of a drive unit according to the invention for testing an electric axle drive module for a motor vehicle in a perspective view,

[0077] Fig. 2 the drive unit of Fig. 1 in a front view,

[0078] Fig. 3 also shows the drive unit of Fig. 1 in a front view,

[0079] Fig. 4 shows, by way of example and schematically, a possible embodiment of a test bench according to the invention in a view from above,

[0080] Fig. 5 shows, by way of example and very schematically, another possible embodiment of a drive unit according to the invention in a view from above and

[0081] Fig. 6 shows the drive unit of Fig. 5 in a front 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.

[0082] Fig. 1 shows, by way of example and schematically, a possible embodiment of a drive unit 100 according to the invention for a test bench (not shown in Fig. 1 ) for testing an electric axle drive module (also not shown in Fig. 1 ) for a motor vehicle in a perspective view.

[0083] The drive unit 100 comprises an electric drive motor 110 with an input shaft 111 and a transmission 120 with an output shaft connected downstream of the drive motor 110. In the illustration in Fig. 1, the output shaft is completely radially enclosed by the transmission housing 121 of the downstream transmission 120 and is not visible.

[0084] The drive motor 110 is mounted on a support frame 112. A terminal box 113 for accommodating the electrical supply lines of the drive motor 110 is arranged on the top side of the drive motor 110.

[0085] The output shaft extends axially through the gearbox housing 121 of the downstream gearbox 120, so that in principle both axial ends of the output shaft can be coupled to an axle drive module to be tested.

[0086] To simplify the coupling, both axial ends of the output shaft each have an output flange 122

[0087] For example, an output flange 122 is coupled to a rotor of a torque measuring flange 123. The entire drive power of the drive motor 110, i.e., the torque and the speed, are transmitted through the rotor of the torque measuring flange 123. The torque measuring flange 123 consists of the rotor, which is non-rotatably connected to the output flange 122, and a stator held on a base 124. The rotor rotates contactlessly within the stator to prevent frictional effects from adversely affecting the test data.

[0088] The rotor of the torque measuring flange 123 is, in turn, coupled to a compensating element 125, which is designed, for example, as a constant velocity joint shaft 125. An input shaft of the axle drive module to be tested can then be coupled to the constant velocity joint shaft 125.

[0089] As can be seen in Fig. 1, the gearbox 120 provides a radial offset between the motor shaft 111 and the output shaft that is greater than half the width of the drive motor 110. As a result, an imaginary axis of the output shaft does not intersect the motor housing of the drive motor 110, but is offset radially outward and therefore easily accessible.

[0090] In addition, the gear unit 120 can be pivoted around the input shaft 111 as the pivot point, meaning that the output shaft can be moved along a circular path around the motor shaft 111. For example, the gear unit 120 has a spindle drive 126 for pivoting, which, when actuated, moves the gear unit 120 or the output shaft along the circular path. The spindle drive 126 is designed to exert a locking effect on the pivoting movement, so that the gear unit 120 remains in the set pivot position after the spindle drive 126 is actuated.

[0091] To keep the gearbox 120 securely and, above all, rigidly in the set pivot position even under high loads and speeds, thus dampening vibrations, the gearbox 120 can be further fixed in the pivot position using four screws 127 (only two of which are visible in the view of Fig. 1) as clamp connections. For example, the gearbox 120 can be pivoted by 45° around the input shaft 111.

[0092] The radial offset created by the gear 120 between the input shaft 111 and the output shaft is provided, for example, via a plurality of meshing spur gears. The gear 120 is therefore designed as a spur gear 120.

[0093] As can also be seen, the transmission 120 has an external oil supply 130. Since the transmission 120 does not have an internal oil supply with an internal oil sump and an internal oil pump, it is comparatively lighter and more compact, which also makes it easier to pivot.

[0094] Fig. 2 shows the drive unit 100 of Fig. 1 in a front view, wherein the external oil supply 130 is not shown for the sake of clarity.

[0095] The gearbox 120 can be seen, which is driven by the drive motor 110 and can be pivoted about the input shaft 111.

[0096] The spindle drive 126 is provided for setting a desired swivel position. Furthermore, a set swivel position can be further fixed using the screws 127 as clamp connections.

[0097] Also visible are the torque measuring flange 123 and the constant velocity joint shaft 125 coupled to the torque measuring flange 123. The support base 124 of the torque measuring flange 123 is not shown in Fig. 2 for the sake of clarity.

[0098] Finally, the drive motor 110 with the terminal box 113 can be seen.

[0099] Fig. 3 also shows the drive unit 100 of Fig. 1 in a front view, with the gear 120 pivoted into different pivot positions. As can be seen, the output shaft, together with the torque measuring flange 123 and the compensating element 125, can be pivoted along the circular path k via the spindle drive 126. For example, the output shaft can be adjusted along the circular path k via the spindle drive 126 to such an extent that a height adjustment of + / - 300 mm along the arrows h is achieved.

[0100] However, the movement along the circular path k also results in a generally unintentional transverse adjustment, i.e., with increasing deviation from the horizontal and increasing transition to the vertical, the transverse component of the spacing becomes increasingly smaller, while the vertical component of the spacing increases. To compensate for this unintentional transverse adjustment, the drive unit 100 is held, for example, on a rail system (not shown) that allows transverse adjustment q along the arrow q. Thus, the complete drive unit 100 can be moved closer to or away from the axle drive module to be tested.

[0101] Fig. 4 shows an example and schematically a possible embodiment of a test bench 200 according to the invention in a view from above.

[0102] The test bench 200 comprises a drive unit 100, a first output unit 210 and a second output unit 220 as well as a test specimen holder (below the axle drive module 240 and not visible in the illustration of Fig. 4), in which an axle drive module 240 to be tested is accommodated.

[0103] The drive unit 100 corresponds, for example, to the drive unit 100 of Figs. 1 to 3 and includes, in addition to the drive motor 110, the transmission 120 and the external oil supply 130.

[0104] The first output unit 210 comprises an electric drive motor with a motor shaft and the second output unit 220 also comprises an electric drive motor with a motor shaft.

[0105] The axle drive module 240 is coupled to drive shafts 211 and 221 via output shafts 241 and 242, which in turn are coupled to the motor shafts of the first and second output units 210, 220, respectively. For coupling the output shafts 241 and 242 to the drive shafts 211 and 221, wheel flanges 243 and 244, for example, are used, which are intended to accommodate vehicle wheels during normal operation of the axle drive module 240.

[0106] The output shaft of the transmission 120 has an output flange 122, a torque measuring flange 123, and a constant velocity joint shaft 125. The constant velocity joint shaft 125 can be coupled to an input shaft 245 of the axle drive module 240, so that the axle drive module 240 can be tested without its own electric motor.

[0107] As can be seen, the test bench 200 also includes a rail system 250 that enables longitudinal displacement of the first and second output units 210, 220, the drive unit 100, and the test specimen holder to align the output units 210, 220, the drive unit 100, and the test specimen holder longitudinally with each other. The test specimen holder is obscured by the axle drive module 240 in the illustration of Fig. 4 and is only indicated by an arrow pointing below the axle drive module 240.

[0108] The rail system 210 also enables a transverse displacement of the drive unit 100 and the test specimen holder in order to align the drive unit 100 and the test specimen holder transversely to each other and to the output units 210, 220.

[0109] Fig. 5 shows, by way of example and very schematically, another possible embodiment of a drive unit 100 according to the invention in a view from above.

[0110] The drive unit 100 of Fig. 5 comprises the electric drive motor 110 with the input shaft 111 and the transmission 120 with the output shaft connected downstream of the drive motor 110.

[0111] As can be seen, the input shaft 111 extends axially through the gearbox 120 and thus represents a further output on the side facing away from the drive motor 110. On the side facing the drive motor 110, the input shaft 111 is connected to a motor shaft of the drive motor 110 via a coupling 114. Fig. 6 shows the drive unit 100 of Fig. 5 in a front view. As illustrated by the arrow s, the gearbox 120 can be rotated by 180° around the input shaft 111, which also represents the pivot axis. 0 be swiveled.

[0112] Reference symbol

[0113] Drive unit electric drive motor

[0114] input shaft

[0115] Carrying frame

[0116] terminal box

[0117] coupling

[0118] Gearbox, spur gear

[0119] Gearbox housing

[0120] Output flange

[0121] Torque measuring flange

[0122] Support base for the stator of the torque measuring flange

[0123] Compensating element, constant velocity joint

[0124] spindle drive

[0125] Screws external oil supply

[0126] Test bench first output unit

[0127] Cardan shaft second output unit

[0128] Cardan shaft

[0129] Axle drive module

[0130] Output shaft

[0131] Output shaft

[0132] Wheel flange

[0133] Wheel flange

[0134] Input shaft 250 Rail system s Arrow q Arrow h Arrow k Circular path

Claims

Patent claims 1. Drive unit (100) for a test bench (220) for testing an electric axle drive module (240) for a motor vehicle, comprising an electric drive motor (110) and a transmission (120) connected downstream of the drive motor (110) and having an input shaft (111) and an output shaft, characterized in that the transmission (120) provides a radial offset between the input shaft (111) and the output shaft (121) which is greater than half the width of the drive motor (110) and in that the downstream transmission (120) is pivotable about the input shaft (111) or about another shaft. 2 Drive unit (100) according to claim 1, characterized in that the gear (120) provides the radial offset via a plurality of meshing spur gears, a belt drive or a chain drive.

3. Drive unit (100) according to at least one of claims 1 and 2, characterized in that the downstream transmission (120) is pivotable in a stepped or continuously variable manner about the input shaft (111) of the downstream transmission (120).

4. Drive unit (100) according to at least one of claims 1 to 3, characterized in that the downstream gear (120) can be fixed in a pivoting position by means of clamps.

5. Drive unit (100) according to at least one of claims 1 to 4, characterized in that the output shaft has a first output flange (122) at a first axial end and a second output flange (122') at a second axial end.

6. Drive unit (100) according to at least one of claims 1 to 5, characterized in that the output shaft has a compensating element (125), wherein the compensating element (125) is designed for coupling to an input shaft (245) of the axle drive module (240).

7. Drive unit (100) according to at least one of claims 1 to 6, characterized in that the output shaft has a torque measuring flange.

8. Drive unit (100) according to at least one of claims 1 to 7, characterized in that the input shaft (111) extends axially through the downstream transmission (120) and represents a further output on a side facing away from the drive motor (110).

9. Drive unit (100) according to at least one of claims 1 to 8, characterized in that the drive unit (100) is designed to pivot the downstream transmission (120) about the input shaft (111) by at least 180 °.

10. Drive unit (100) according to at least one of claims 1 to 9, characterized in that the downstream transmission (120) has an external oil supply (130).

11. Drive unit (100) according to at least one of claims 1 to 10, characterized in that the output shaft of the downstream transmission (120) has a height adjustability (h) along a circular path of + / - 300 mm.

12. Drive unit (100) according to at least one of claims 1 to 11, characterized in that an axis of the output shaft is spaced at least 80 mm from a radially outer end of a transmission housing (121).

13. Test bench (200), comprising a drive unit (100) according to at least one of claims 1 to 11, a first output unit (210) and a second output unit (220) as well as a test specimen holder (240), wherein the first output unit (210) comprises an electric drive motor with a motor shaft, wherein the second output unit (220) comprises an electric drive motor with a motor shaft, wherein the test bench (200) is designed to accommodate an electric axle drive module (240) in the test specimen holder in such a way that the output shaft of the downstream transmission (120) of the drive unit (100) can be coupled to an input shaft (245) of the electric axle drive module (100), that the motor shaft of the drive motor of the first output unit (210) can be coupled to a first output shaft (241) of the electric axle drive module (240), and that the motor shaft of the drive motor of the second output unit (220) can be coupled to a second output shaft (242) of the electric axle drive module (240).

14. Test stand (200) according to claim 13, characterized in that the test stand (200) further comprises a rail system (250) or a cast bed with grooves in order to enable a transverse adjustability q of the drive unit (100) and / or to enable a longitudinal adjustability of the drive unit (100), the first output unit (210) and the second output unit (220).

15. Test bench (200) according to claim 14, characterized in that the transverse adjustability (q) is at least + / - 300 mm.

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