Lubricant test setup

Abstract

The invention relates to a lubricant test arrangement for measuring electrical parameters of a lubricant in a lubricated test bearing 5, comprising - a measuring cell 4 for receiving the test bearing 5 and a measuring sensor 24, wherein the measuring cell 4 has a temperature control device 15, and - a test device 2 with a measuring chamber 3, measuring electronics 31, a control unit 32, a motor arrangement 33 controlled by the control unit 32 and a device housing 34 enclosing at least the motor arrangement 33, wherein the device housing 34 has an opening 35 leading to a measuring chamber 3 on the side of the test device, through which the measuring cell 4 can be inserted into the test device 2 and the measuring chamber 3 has a support 37 which independently holds the measuring cell 4, wherein the control unit 32 is designed to transfer a measuring cell 4 placed on the support 37 from an insertion position to a functional position for a measurement by means of the motor arrangement 33 and wherein the measuring cell 4 comprises an interface 49 to the measuring electronics 31 on the side of the test device and a mechanical coupling device 43 to the motor arrangement 33 on the side of the test device.

Description

[0001] The invention relates to a lubricant test arrangement for measuring electrical parameters of a lubricant in a lubricated test bearing.

[0002] Measuring instruments for lubricant testing are known, whereby, in addition to determining mechanical properties and aging characteristics, the measurement of electrical parameters of lubricants is relevant for assessing the damage threshold caused by bearing currents. In particular, discharge currents, similar to the abrasive manufacturing process EDM (electrical discharge machining), leave local craters (pittings) on the running surfaces, which progressively damage a bearing.

[0003] Furthermore, determining the electrical properties of a lubricant film over a wide temperature range is necessary to assess its suitability for use in a given bearing configuration. For this purpose, the complex impedance can be determined on a lubricated test bearing, as exemplified by US 4,345,203 A. For dynamic measurements on a lubricant film, the resulting current at a given temperature is determined by applying voltage waveforms, and the complex impedance, as well as the electrical parameters of resistance and capacitance, are calculated from these measurement data.

[0004] A standard measuring system used for this purpose is a four-ball apparatus (VKA), for example, reference is made to US 6971257 B1. Such four-ball apparatuses were originally developed for simplified tribological lubricant tests, in which the weld point of the four-ball system is determined under a successively increasing load on the central ball.

[0005] For impedance measurements using four-ball devices, it is important to note that the lubrication and friction conditions in the tribological system significantly influence the electrical behavior of the lubricant film under investigation. Therefore, it is advantageous to determine the electrical properties of a lubricant as close as possible to the application conditions using a lubricated test bearing, particularly a rolling bearing. The geometrically complex test system with a lubricated test bearing requires more sophisticated equipment compared to VKA lubricant testers. Furthermore, it places higher demands on the expertise of the operating personnel for the preparation and execution of lubricant tests.

[0006] The invention is based on the objective of providing a lubricant test arrangement for measuring electrical parameters of a lubricant in a lubricated test bearing, which provides the user with a compact and easy-to-use measuring device and which, in addition to improved measurement quality, increases the degree of automation and standardization of lubricant tests.

[0007] The lubricant test arrangement according to the invention comprises a test device and a measuring cell. The measuring cell is designed to accommodate a test bearing and a measuring sensor and includes a temperature control device. The test device includes a measuring chamber for accommodating the measuring cell.

[0008] Enclosing the test bearing in a measuring cell offers several advantages. It results in a single, manageable unit that, due to the reduction to the essential components for bearing and temperature control, can be designed to be particularly compact. Additionally, the removable measuring cell from the test instrument provides improved accessibility for mounting the test bearing. Proper insertion of the test bearing into the measuring cell is crucial for the subsequent lubricant tests, so this step typically requires trained specialists, while the separate steps on the test instrument for performing the lubricant test require less expertise. The measuring cell also includes a temperature control unit and is designed to ensure that the test bearing mounted within the measuring cell remains at a constant temperature during the measurement.The compact design of the measuring cell reduces thermal mass, allowing for faster temperature-variable measurements.

[0009] The test device provides a functional interface for the measuring cell within the measuring chamber. Furthermore, the test device includes measuring electronics, a control unit, and a motor assembly controlled by the control unit. Additionally, the test device is housed in a casing that encloses at least the motor assembly. The casing has an opening leading to the measuring chamber on the test device side, through which the measuring cell can be inserted into the test device.

[0010] The measuring chamber of the test device has a tray designed to hold the measuring cell independently after insertion by the user. In this position, hereinafter referred to as the insertion position, there is no coupling to the motor assembly of the test device. Therefore, when inserting the measuring cell into the test device's measuring chamber, the user only needs to place it on the tray without having to precisely position it or manually couple it to the motor assembly.

[0011] The control unit of the test device is designed to use the motor assembly to move a measuring cell, which is placed on the platform, from its insertion position to a functional position for lubricant measurement. For this purpose, the measuring cell includes a mechanical coupling device that is compatible with the motor assembly of the test device. Additionally, the measuring cell has an interface to the test device's measurement electronics.

[0012] The lubricant test arrangement according to the invention enables simplified insertion of the measuring cell, pre-assembled with the test bearing, into the test device. The outer contour of the measuring cell is adapted to the shelf in the measuring chamber of the test device in such a way that the operator is intuitively guided to the correct insertion position for the measuring cell. In a preferred embodiment, protruding support rails are provided on the underside of the measuring cell, which correspond to a lateral boundary of the shelf, so that the operator can place the measuring cell onto the shelf like a drawer. The typical operating movement is a horizontal insertion of the measuring cell parallel to the lateral boundary of the shelf.

[0013] After insertion, the measuring cell is in a placement position on the measuring chamber's support and is held independently by the chamber, eliminating the need for any further manual intervention to move the measuring cell into its operating position. This position is achieved by the motor assembly and the control unit of the testing device, preferably through an automated movement routine. In an advantageous embodiment, an axial force actuator located beneath the support causes the measuring cell to pass through an opening in the support and lift it off. For this purpose, a floating bearing is provided on the measuring cell as a mechanical coupling device, allowing a certain degree of translational and rotational movement, which is used for centering during the subsequent axial movement.For this purpose, a self-centering device is preferably provided as a further mechanical coupling device on the measuring cell, which advantageously comprises a ball element and a centering recess. The self-centering device of the measuring cell is designed to engage with a complementary device on the spindle of a test bearing drive, which is typically arranged above the storage area.

[0014] The transition of the measuring cell to its functional position is complete when the measuring cell is clamped centrally between the radial force actuator and the test bearing drive and connected to the latter by means of at least one positive-locking rotary drive element for the rotational coupling of the test bearing. Consequently, for a measuring cell in its functional position, the mechanical coupling to the motor assembly for performing lubricant tests is established.

[0015] Furthermore, the additional interfaces provided on the measuring cell for the test equipment's measurement electronics allow for simplified signal connection by the operator. A single-cable solution is preferred, as it bundles all signals to the measurement electronics in a single cable. A bus system is advantageous, requiring the operator to connect only one plug to the measuring cell. Alternatively, signals from the measuring cell's sensors can be transmitted wirelessly to the test equipment. Accordingly, the interface on the measuring cell can include components for optical communication or near-field data transmission.

[0016] After the measuring cell is moved into its operating position within the measuring chamber, the operator typically connects a supply line for the heat transfer medium to the measuring cell. In a preferred embodiment, the measuring cell has a fluid connection for a heat transfer medium for this purpose, wherein the fluid connection is connected to a channel network of the measuring cell's temperature control unit. The channel network of the temperature control unit is designed to ensure temperature stability of the measuring cell for lubricant testing. An embodiment is conceivable in which the channel network is formed in a support plate for the test bearing and means for improving thermal coupling are provided. Furthermore, the use of a thermally conductive paste or a shape adapted to at least one bearing shell of the test bearing is advantageous. Additionally, the fluid connection on the measuring cell can include a coupling section to a fluid supply line.

[0017] For an advantageous embodiment, the measuring cell is additionally provided with an interface to a lubricant supply, to which a lubricant line can be connected. In a particularly preferred embodiment, at least two lubricant passes are provided, so that lubricant tests can be performed with a lubricant circulating through the test bearing. Alternatively, a shut-off element is arranged on the lubricant supply of the measuring cell, so that a predetermined quantity of lubricant can be added outside the test device during configuration of the measuring cell. Furthermore, a lubricant supply allows for the replacement of the lubricant without having to remove the test bearing from the measuring cell.Accordingly, a lubricant change between different measuring cycles, possibly including a necessary flushing, is also possible for a measuring cell in the functional position within the test device.

[0018] For an advantageous embodiment, the housing of the test device is designed such that the measuring chamber is essentially shielded from the external environment, with the measuring chamber being located inside the test device. For a version with improved accessibility, the opening in the housing for inserting the measuring cell can have several separate openings, allowing access from different directions. To improve shielding, an advantageous embodiment provides only one opening in the housing, which is preferably protected by a cover. The opening is adapted to the dimensions of the measuring cell and, in addition, its shape is designed so that the user automatically inserts the measuring cell into the measuring chamber with the correct orientation, thus guiding it into the insertion position on the tray.

[0019] In addition, the double enclosure of the test bearing by the instrument housing and the direct enclosure by the measuring cell increases the operational stability of the test bearing and improves the accuracy of lubricant measurements. Furthermore, this results in a user-friendly and compact laboratory measuring device, with the compactness achieved through the combination of a manually operated measuring cell with an interface and a mechanical coupling device to the components of the testing instrument, in conjunction with an automatic transfer from an insertion position to a functional position within the measuring chamber.

[0020] For a further development of the invention, the measuring cell has two separate sections. A first section serves to accommodate the test bearing and the temperature control unit. The additionally provided second section allows for the accommodation of a calibration unit for the measuring electronics. This offers the advantage of short and defined cable lengths between the measuring sensor associated with the test bearing and a calibration unit. Even with identical designs, test bearings installed in the measuring cell exhibit different inherent capacitances, necessitating a calibration step to perform measurements on different lubricant test setups. An automated calibration step, performed by the control unit of the lubricant test setup's testing device as a preparatory routine for a test measurement, is advantageous, as it eliminates the need for operator intervention requiring specialized knowledge.

[0021] For a further advantageous embodiment of the invention, the test device comprises a motor arrangement with a test bearing drive and / or an axial force actuator and / or a radial force actuator. A sensor arrangement is particularly preferred, which can be attached to the test device or integrated into the measuring cell and which enables the forces applied to the test bearing to be determined over a wide test field. Preferably, the circumferential force and / or the axial force and / or the radial force acting on the test bearing is determined. Additionally, for an advantageous embodiment, an angular contact measuring device for the test bearing is provided, associated with the motor arrangement and / or the measuring cell. For a structurally simple and advantageous design, a gear with a marked circumferential position is integrated into the test bearing drive for this purpose. By determining the angular position or...The angular position of the test bearing, determined via interpolation using discrete measurement data, can be correlated with the measurement of electrical parameters and angular information about the bearing position.

[0022] For particularly precise circumferential force measurements on the test bearing, a measuring window is used. During this window, the determination of the electrical parameters is at least temporarily suspended, and a sliding contact arrangement of a measuring cell is raised to eliminate a mechanical disturbance. While the electrical parameters are being measured, a voltage is applied to the test bearing using the sliding contact arrangement. For this purpose, the test bearing is electrically contacted, at least indirectly, via a brush electrode that rests against a bearing shell contact in its operating position. Accordingly, for the precise mechanical measurement of the bearing forces, an actuator is provided on the measuring cell to lift the brush electrode from the bearing shell contact.

[0023] For further enhancement, the measuring cell includes a vibration sensor for detecting vibrations of the test bearing. Preferably, the vibration sensor is matched to the geometry of the test bearing, whereby, when using an axial bearing as the test bearing, the vibration sensor measures essentially axial vibrations, so that information for the proper mounting of the test bearing within the measuring cell can be obtained from the measurement result. Additionally, a deterioration in the bearing quality of the test bearing during operation of the lubricant test setup can be detected based on the measurement data from the vibration sensor, and the test bearing can be replaced accordingly by removing the measuring cell from the test device.

[0024] For an advantageous embodiment, the measuring cell includes a clamping device for mounting the test bearing. A particularly preferred embodiment includes an adapter in the clamping device that allows the use of differently dimensioned test bearings in a uniformly designed measuring cell. Adaptation to different bearing types is also possible, enabling a change from an axial to a radial bearing. In this case, additional adapters are provided on the test equipment side, particularly for the spindle of the test bearing drive of the motor assembly. Alternatively, the lubricant test arrangement can have different measuring cells, each adapted to a specific test bearing.

[0025] In an additional embodiment, the lubricant test arrangement according to the invention features an automated measuring cell exchange system. This allows for the storage of several differently configured measuring cells, for example in a carousel system, and the automatic transfer of a selected measuring cell into the measuring chamber of the test device. The measuring cell exchange system then moves the respective measuring cell into the insertion position on the shelf of the measuring chamber, with the subsequent transfer to the operating position being carried out by the motor arrangement on the test device. This enables fully automated testing of a large number of measuring cells with different lubricants and / or different bearings.

[0026] The following is an example of an embodiment of the invention in connection with figural representations. These show, schematically, the following: Fig. 1: shows a lubricant test arrangement according to the invention in longitudinal section, Fig. 2: shows the lubricant test setup Fig. 1 for section B - B, Fig. 3: shows a measuring cell of the lubricant test arrangement according to the invention in longitudinal section, Fig. 4: shows the section B - B from Fig. 3 for the measuring cell, Fig. 5: shows a three-dimensional view of the measuring cell and Fig. Figure 6 shows a three-dimensional view of the lubricant test arrangement according to the invention.

[0027] Fig. Figure 1 shows a lubricant test arrangement 1 according to the invention as a longitudinal section. A test device 2 and a measuring cell 4 housed in a measuring chamber 3 of the test device 2 are shown. The measuring cell 4 forms a manageable unit and serves to enclose a lubricated test bearing 5 on which lubricant tests are carried out.

[0028] Measuring cell 4 can be removed from measuring chamber 3 of the test device 2 for configuration, in particular for mounting the test bearing 5 and filling it with a lubricant. (From the sectional view of) Fig. Figure 3 shows the structure of the measuring cell 4 with a receiving area 6, which is enclosed by a receiving tray 7 and a cover part 8. The replaceable test bearing 5 is located in the receiving area 6. In this case, it is designed as an axial rolling bearing with an upper bearing shell 9 and a lower bearing shell 10, as well as intermediate rolling elements 11. The test bearing 5 is held within the measuring cell 4 by means of a clamping device 12, so that the lower bearing shell 10 forms a fixed part. The upper bearing shell 9 is connected to a rotary driver 13, which is sealed against the cover part 8 by means of a labyrinth seal 14.

[0029] The removable measuring cell 4 from the measuring chamber 3 of the test device 2 provides good accessibility for the proper installation of the test bearing 5 in the receiving area 6. The compact design of the measuring cell 4 reduces its thermal mass, thus enabling rapid test cycles with temperature changes. A temperature control unit 15 is provided on the measuring cell 4 to maintain a constant temperature. This can be seen in the cross-sectional view BB of Fig. Figure 4 shows a fluid connection 16 with an inlet 17 and an outlet 18 in fluidic connection to a channel network 20 provided in a support plate 19 for supplying the temperature control device 15. During a measurement, a heat transfer medium is passed through the channel network 20 for temperature control.

[0030] For lubricant measurement, the receiving area 6 of the measuring cell 4, containing the test bearing 5, is filled with oil or grease as a lubricant. For the in Fig. In the embodiment shown in Figure 3, a lubricant supply 21 with a closure element 22 is provided for this purpose. Additionally, a lubricant drain 23 is provided for changing the lubricant.

[0031] In addition to the test storage area 5, the measuring cell 4 incorporates a measuring sensor system 24, whereby Fig. Figure 3 shows an embodiment with a temperature sensor 25 as part of the measuring sensor system 24. Additionally, a vibration sensor 26 is provided, which is adapted to the test bearing 5, designed here as an axial bearing, as an axial acceleration sensor. The vibration sensor 26 detects bearing vibrations, which provide an indication of proper installation of the test bearing 5 in the measuring cell 4. Furthermore, the signals from the vibration sensor 26 can detect critical bearing wear, enabling timely replacement of the test bearing 5 before a significant deterioration in measurement accuracy.

[0032] Out of Fig. 3 and Fig. Figure 4 shows an advantageous embodiment of the measuring cell 4 with a first section 27 and a second section 28. The test bearing 5 and the measuring sensor 24 are located within the first section 27. The second section 28, which is enclosed by a separate housing, provides a space close to the test bearing for a calibration unit 29. This allows for short and defined cable lengths as well as simplified accessibility for the calibration unit 29. Advantageously, after the measuring cell 4 is inserted into the measuring chamber 3 of the test device 2, a calibration routine is automatically performed by the test device 5 to adapt to the specific capacity of the test bearing 5, without requiring manual adjustment of electronic compensation elements of the calibration unit 29.

[0033] To measure the electrical properties of a lubricant, a measuring voltage is applied to the test bearing 5 located in the measuring cell 4. The contact is made using the contact shown in Fig. Figure 5 shows the sliding contact arrangement 30 of the measuring cell 4, which electrically contacts the upper bearing shell 9 of the test bearing 5 via the rotary driver 13. The electrical parameters in the functional position are measured via electrodes (not shown) on the lower bearing shell 10 via the calibration unit 29 to the Fig. The measuring electronics 31 shown in Figure 1 are assigned to the test device 2. Further essential components of the test device 2 are a control unit 32 and a motor assembly 33, which, in the present embodiment, are enclosed in a device housing 34.

[0034] For the insertion of a measuring cell 4 into the measuring chamber 3 of the test device 2, an opening 35, preferably shaped to fit the measuring cell 4 and covered by a cover 36, is provided on the device housing 34. The insertion of the measuring cell 4 into the measuring chamber 3 can be carried out without device-specific expertise, since the measuring cell 4 simply needs to be placed on a support 37 in the measuring chamber 3. From the in Fig. Figure 6 shows a three-dimensional view of the test device 2 (shown without the cover 36), which shows that the support 37 is positioned so that it independently holds the measuring cell 4. In this position, the measuring cell 4 is in a so-called insertion position, which does not yet correspond to the functional position required for carrying out the measurement, with precise positioning and a defined clamping situation.

[0035] Due to the cassette-like design of the measuring cell 4, insertion into the measuring chamber 3 essentially occurs as a horizontal insertion movement, whereby, as in Fig. Figure 3 shows that paired support rails 38 are provided on the underside of the receiving tray 7 of the measuring cell 4. These correspond to the lateral boundaries of the tray 37 (not shown in detail), thus providing a guide structure that enables sufficiently precise manual insertion of the measuring cell 4 into the measuring chamber 3, allowing for intuitive and proper placement on the tray 37. From the placement position, the measuring cell 4 is automatically moved to the operating position by the control unit 32 through appropriate control of a motor arrangement 33. For this purpose, a radial force actuator 41, located below the tray 37, first reaches through a tray opening 42 to the underside of the measuring cell 4.The measuring cell 4 has a mechanical coupling device 43, which is designed as a floating bearing, so that translational and rotational adjustments are possible during the further course of movement. Another part of the mechanical coupling device 43 is a self-centering device 44 arranged on the top of the measuring cell 4 with a ball element 45 in a centering recess 46.

[0036] During the further axial movement, the ball element 45 is guided to a counterpart 47 on the test equipment side of a centering spindle 48, which is connected to the test bearing drive 39. This ensures axial centering and, with the completion of the axial movement, also a positive engagement of the rotary driver 13 for the rotational coupling of the test bearing 5. This provides the mechanical coupling for performing lubricant tests for the measuring cell 4, which is now in its functional position, and operational readiness is then achieved by connecting the necessary fluidic and electrical connections. For this purpose, the measuring cell 4 has an interface 49 to the measuring electronics 31 on the test equipment side. As in Fig. As shown in Figure 1, a single-cable solution is provided for the illustrated embodiment, in which all signals to the measuring electronics 31 are bundled by means of a bus system, so that a single contact connector 50 is used for signal transmission. In addition, the temperature control device 15 described above is to be hydraulically connected to the heat transfer medium circuit, which is not shown in detail.

[0037] In the preferred embodiment shown, an angular contact bearing measuring device 51 is integrated into the test bearing drive 39. This device is designed as a gear 52 with a marked circumferential position. The angular position can thus be approximately determined from an interpolation signal and correlated with the time-resolved measurement of the electrical parameters for the lubricant test. The test device 2 also includes a circumferential force sensor 53, an axial force sensor 54, and a radial force sensor 55, which enable precise determination of the bearing loads for the lubricant test.

[0038] In addition, for more precise circumferential force measurement, the sliding contact arrangement 30 is designed to be liftable. This is shown in Figure 1. Fig. 5 a brush electrode 56 which rests on a bearing shell contact 57, wherein an actuator 58 is assigned to the brush electrode 56 which realizes the lifting during the circumferential force measurement.

[0039] The invention has been described using an exemplary embodiment. Without departing from the scope of protection described by the applicable claims, numerous further embodiments of the inventive concept would be apparent to a person skilled in the art, without these needing to be explained in more detail within the scope of these explanations. Reference symbol list 1 Lubricant test setup 2 Testing device 3 measuring chambers 4 measuring cells 5 test camps 6 Recording area 7 Receiving tray 8 lid part 9 upper bearing cup 10 lower bearing shell 11 rolling elements 12 clamping device 13 rotary drive 14 Labyrinth seal 15 Temperature control unit 16 Fluid connection 17 Admission 18 Outlet 19 Support plate 20 canal network 21 Lubricant supply 22 Locking element 23 Lubricant drain 24 Measuring sensors 25 Temperature sensor 26 Vibration sensor 27 first section 28 second section 29 Calibration unit 30 Sliding contact arrangement 31 Measuring electronics 32 Control unit 33 Engine arrangement 34 device housings 35 Opening 36 Cover 37 Filing 38 Support rail 39 Test bearing drive 40 Axial force actuator 41 Radial force actuator 42 Storage compartment 43 mechanical coupling device 44 Self-centering device 45 spherical elements 46 Centering recess 47 counterpart 48 Centering spindle 49 Interface 50 contact plugs 51 Angular position measuring device 52 gear 53 Circumferential force sensor 54 Axial force sensor 55 Radial force sensor 56 Brush electrode 57 Bearing shell contact 58 Actuator

Claims

[1] Lubricant test arrangement for measuring electrical parameters of a lubricant in a lubricated test bearing (5), comprising - a measuring cell (4) for accommodating the test bearing (5) and a measuring sensor (24), wherein the measuring cell (4) has a temperature control device (15), and - a testing device (2) with a measuring chamber (3), measuring electronics (31), a control unit (32), a motor arrangement (33) controlled by the control unit (32), and a device housing (34) enclosing at least the motor arrangement (33), wherein the device housing (34) has an opening (35) leading to a measuring chamber (3) on the testing device side, through which opening the measuring cell (4) can be inserted into the testing device (2), and the measuring chamber (3) has a shelf (37) that independently holds the measuring cell (4), wherein the control unit (32) is designed to transfer a measuring cell (4) placed on the shelf (37) from an insertion position into a functional position for the measurement by means of the motor arrangement (33), and wherein the measuring cell (4) has an interface (49) to the measuring electronics (31) on the testing device side and a mechanical coupling device (43) to the motor arrangement (33) on the testing device side includes. [2] Lubricant test arrangement according to claim 1,characterized by that the device housing (34) essentially shields the measuring chamber (3) so that the measuring chamber (3) is arranged within the test device (2). [3] Lubricant test arrangement according to one of claims 1 or 2, characterized by that the mechanical coupling device (43) of the measuring cell (4) comprises a floating bearing and / or a self-centering device (44). [4] Lubricant test arrangement according to one of claims 1 to 3, characterized by that the measuring cell (4) comprises a fluid connection (16) for a heat transfer medium, wherein the fluid connection (16) is connected to a duct network (20) of the temperature control device (15) of the measuring cell (4) for temperature control of the test bearing (5). [5] Lubricant test arrangement according to one of claims 1 to 4, characterized bythat the measuring cell (4) comprises a first section (27) for receiving the test bearing (5) and the temperature control device (15) and a second section (28) for receiving a calibration unit (29) of the measuring electronics (31). [6] Lubricant test arrangement according to one of claims 1 to 5, characterized by that the measuring cell (4) comprises a lubricant supply (21) with a closure element (22) and / or an interface to a lubricant supply. [7] Lubricant test arrangement according to one of claims 1 to 6, characterized by in that the measuring cell (4) comprises a sliding contact arrangement (30) for at least indirect electrical contact with the test bearing (5), wherein the sliding contact arrangement (30) comprises a brush electrode (56) which, in the functional position, rests against a bearing shell contact (57), and an actuator (58) is provided for lifting the brush electrode (56) from the bearing shell contact (57) in order to carry out a bearing friction measurement. [8] Lubricant test arrangement according to one of claims 1 to 7, characterized by that the measuring cell (4) comprises a vibration sensor (26) for detecting vibrations of the test bearing (5). [9] Lubricant test arrangement according to one of claims 1 to 8, characterized by that the measuring cell (4) comprises a clamping device (12) for mounting the test bearing (5). [10] Lubricant test arrangement according to claim 9, characterized by that the clamping device (12) comprises an adapter for adaptation to differently dimensioned test bearings (5). [11] Lubricant test arrangement according to one of claims 1 to 10, characterized by that the motor arrangement (33) comprises a test bearing drive (39) and / or an axial force actuator and / or a radial force actuator. [12] Lubricant test arrangement according to one of claims 1 to 11, characterized bythat the motor arrangement (33) and / or the measuring cell (4) comprises an angular position measuring device (51) for the test bearing (5). [13] Lubricant test arrangement according to claim 12, characterized by that the angular position measuring device (51) comprises a gear (52) accommodated in the test bearing drive (39) with a marked circumferential position. [14] Lubricant test arrangement according to one of claims 1 to 13, characterized by that the measuring electronics (31) are designed for additional detection of the circumferential force and / or axial force and / or radial force acting on the test bearing (5). [15] Lubricant test arrangement according to one of claims 1 to 14, characterized by that the testing device (2) is designed for an automated mechanical coupling of the measuring cell (4) in the measuring chamber (3). [16] Lubricant test arrangement according to one of claims 1 to 15, characterized by that an automated measuring cell changing system is available.

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