Vertical direct-drive multi-field coupling bearing friction torque measurement test bench

Abstract

The invention discloses a vertical direct-drive multi-field coupling bearing friction torque measurement test bench, which can measure the friction torque of a tested bearing under the working condition of coupling an external load, an electric field and a temperature field, and supports the presetting of an electric field and temperature field environment and the accurate setting of the load before a test. According to the invention, the test condition range of the tested bearing pair is expanded, the actual condition is better simulated, and a comprehensive test platform with richer functions is provided for bearing lubrication research.

Description

Technical Field

[0001] This invention belongs to the technical field of bearing performance testing equipment, specifically relating to a vertical direct-drive multi-field coupled bearing friction torque measurement test bench. Background Technology

[0002] A utility model entitled "Ball Bearing Friction and Wear Test Bench" discloses a ball bearing friction and wear test bench, relating to the field of testing wear or corrosion resistance technology. The test bench includes a base with two hydraulic telescopic rods fixed to its upper surface, the telescopic ends of which are connected to a mounting block. The mounting block is equipped with a linkage mechanism, including multiple structural rods. A first gear is fixed to the upper end of each structural rod, and the lower end passes through the mounting block and connects to an electromagnetic block for adsorbing and fixing the ball bearings. A support shaft is also rotatably connected to the mounting block, and a fixing ring is fixed to the upper end of the support shaft via a connecting plate. An internal gear ring meshes with each of the first gears on the inner wall of the fixing ring. An external gear ring is fitted on the outer surface of the fixing ring, meshing with a second gear. The second gear is connected to a vertical rod and is driven by a first motor fixed to the mounting block. A friction disc is fixed to the upper surface of the base. During operation, the hydraulic telescopic rods press down, causing the bearings to contact the friction disc. The first motor drives all the electromagnetic blocks and bearings to rotate synchronously through a gear set, realizing synchronous friction and wear testing of multiple bearings, effectively improving testing efficiency and the practicality of the device.

[0003] A utility model entitled "A Bearing Friction Torque Measuring Device" discloses a bearing friction torque measuring device, mainly comprising a frame and a torque measuring module disposed within it. This module includes an elastic inner ring positioning shaft, a base, a DC motor, and a cylindrical torque sensor. The measuring end of the torque sensor is connected to an outer fixing plate, on which an elastic outer ring positioning sleeve is fixed; the output end of the DC motor passes through the inner cavity of the torque sensor via a rotating shaft and is fixedly connected to the elastic inner ring positioning shaft. During measurement, the bearing to be measured is installed between the elastic outer ring positioning sleeve and the elastic inner ring positioning shaft. The DC motor drives the inner ring of the bearing to rotate, and the friction torque is transmitted through the outer ring to the outer fixing plate, where it is measured by the torque sensor. This invention utilizes an elastic positioning structure to effectively compensate for installation errors, reduce additional clamping stress and mechanical vibration interference, thereby improving measurement accuracy.

[0004] In existing technologies, since no external electric field and temperature field are applied, it is difficult to accurately simulate the actual operating conditions of the bearing, resulting in significant deviations between the data obtained from the friction test and the actual operating conditions. Therefore, it is impossible to truly reflect the wear behavior of the bearing under complex operating conditions.

[0005] Existing technology 1: The transmission system of the ball bearing friction and wear test bench relies on multi-stage mechanical transmission, resulting in significant energy loss and making it impossible to directly and accurately calculate the actual output power acting on the bearing friction pair.

[0006] Existing technology 2: A bearing friction torque measuring device improves the accuracy of friction torque measurement by using rubber material components, but it has significant limitations. The stiffness of rubber material decreases as the temperature increases, so the friction torque measured by this technology has a large systematic deviation under different temperature conditions. Summary of the Invention

[0007] In view of this, in actual mechanical systems, bearings typically bear coupled loads from multiple fields, including force, electric, and temperature fields. This invention enables the measurement of the frictional torque of a pair of bearings (i.e., the first and second test bearings) under coupled external load, electric, and temperature conditions, better simulating actual working conditions and providing a more comprehensive and functional test platform for bearing lubrication research. This invention uses a direct drive mechanism—motor-coupling-test spindle—to rotate the bearing and measure its frictional torque. This structure not only has a short mechanical transmission path and low power loss but also helps improve the accuracy of torque measurement.

[0008] A vertical direct-drive multi-field coupled bearing friction torque measurement test bench includes a transmission device and a testing device; The transmission device includes a main shaft (33), a coupling (32), and a servo motor (31); the main shaft (33) is divided into a test section and a support section, and the surface of the support section is coated with insulating paint. The output shaft of the servo motor (31) is connected to the lower part of the support section of the main shaft (33) via a coupling (32) to transmit torque; The testing device includes a tapered sleeve (34), a test bearing housing (41), a test bearing end cap (42), a wave spring (43), a wave spring fixing piece (44), a test bearing inner ring bushing (49), a test bearing pair, a first conductive bolt (410), and a second conductive bolt (420); the test bearing pair includes a first test bearing (48) and a second test bearing (411). A tapered sleeve (34) is fitted onto the test section of the spindle (33), and the test bearing pair is interference-fitted onto the tapered sleeve (34). The two are separated by the inner ring bushing (49) of the test bearing. The test bearing housing (41) is transition-fitted onto the outside of the test bearing pair. The test bearing housing (41) is fitted onto the spindle (33) by the tapered surface of the tapered sleeve (34) and is fixedly installed with a fixing nut (45). The inner ring of the test bearing pair is fixed to the tapered sleeve (34), and the outer ring of the test bearing pair is fixed to the test bearing housing (41). The wave spring (43) is set on the test section through the wave spring fixing piece (44). Above the bearing pair, the test bearing end cap (42) is installed on the end face of the test bearing housing (41) and axially presses the installed wave spring (43) and wave spring fixing member (44) to provide axial load to the test bearing pair. At the same time, the magnitude of the applied axial load is precisely controlled by adjusting the deformation of the wave spring (43). The wave spring (43) transmits the axial force to the wave spring fixing member (44). The wave spring fixing member (44) and the test bearing housing (41) are clearance fit. The wave spring fixing member (44) finally transmits the axial load to the first test bearing (48). The test bearing housing (41) has a radially arranged slot. The first conductive bolt (410) and the second conductive bolt (420) are fixedly installed in the slot of the test bearing housing (41). The end faces of the first conductive bolt (410) and the second conductive bolt (420) are designed to be hemispherical, and the spherical surface is in contact with the test bearing pair. The first conductive bolt (410) and the second conductive bolt (420) are connected to one pole of the external circuit, and the spindle (33) is connected to the other pole of the external circuit through the split carbon brush (419), thereby providing an external electric field environment for the test bearing pair. The inner and outer sides of the test bearing housing (41) are coated with insulating varnish.

[0009] Furthermore, it also includes a support device; the support device includes a first gantry support shaft (28), a second gantry support shaft (21), a third gantry support shaft (27), a fourth gantry support shaft (29), a first motor bracket side plate (22), a second motor bracket side plate (210), a first gantry (24), a second gantry (26), and a gantry carbon brush holder (25). The first gantry support shaft (28), the second gantry support shaft (21), the third gantry support shaft (27), and the fourth gantry support shaft (29) are installed parallel to each other on the base plate (1). The first gantry (24) is installed on the first gantry support shaft (28) and the second gantry support shaft (21), and the second gantry (26) is installed on the third gantry support shaft (27) and the fourth gantry support shaft (29). The gantry carbon brush holder (25) is fixed between the first gantry (24) and the second gantry (26). The servo motor (31) is fixed on the base plate (1) through the motor bracket plate (23) and the first motor bracket side plate (22) and the second motor bracket side plate (210). The upper end of the spindle (33) extends out of the mounting hole provided by the gantry carbon brush holder (25), the split carbon brush (419) is fixed on the gantry carbon brush holder (25), and it is connected to the middle part of the upper end of the spindle (33); the split carbon brush (419) is one pole of the circuit and is used to connect the spindle (33) to the circuit.

[0010] Preferably, the bottom of the main shaft (33) is designed with a shoulder structure for axial positioning and installation of the oil baffle ring (413).

[0011] Preferably, the surface of the spindle (33) is tapered, and the test bearing pair is installed and positioned by cooperating with the tapered sleeve (34), the fixing nut (45) and the locking nut (46).

[0012] Preferably, the inner wall of the test bearing housing (41) is provided with a wire groove, and a heating coil is installed inside to provide an external temperature field for the test bearing.

[0013] Preferably, the grooves are opened at the upper and lower ends of the test bearing pair, and the first heating coil (47) and the second heating coil (412) are respectively provided.

[0014] Preferably, the outer wall of the test bearing housing (41) is radially fixed to a sensor mounting plate (414), and two sensor mounting brackets are connected to each side, namely a first sensor mounting bracket (415) and a second sensor mounting bracket (416); a torque sensor is installed on each mounting bracket, namely a first torque sensor (417) and a second torque sensor (418), which are symmetrically distributed with respect to the sensor mounting plate (414) and are used to measure the frictional torque generated by the test bearing during the test.

[0015] The present invention has the following beneficial effects: 1. This invention can measure the frictional torque of the tested bearing pair (i.e., the first test bearing and the second test bearing) under the coupled working conditions of external load, electric field and temperature field. The system supports preset electric field and temperature field environment and accurate load setting before the test, and supports dynamic adjustment of the strength of the external electric field during the test. This design expands the test working condition range of the tested bearing pair, better simulates the actual working conditions, and provides a more comprehensive test platform with richer functions for bearing lubrication research.

[0016] 2. This invention uses a direct drive mechanism—motor-coupling-test spindle—to rotate the bearing and measure its frictional torque. This structure not only has a short mechanical transmission path and low power loss, but also helps to improve the accuracy of torque measurement.

[0017] 3. This invention uses pre-drilled holes in the bearing housing and insulating sleeves to fix the conductive bolts. The ends of the conductive bolts are designed to be hemispherical, ensuring firm contact with the outer ring of the bearing. This allows the conductive bolts, bearing, tapered sleeve, spindle, external carbon brush, and external wiring to form a normal circuit path, thereby applying an external electric field to the bearing. The magnitude of the applied electric field can be adjusted by modifying the external circuit. Furthermore, insulation is achieved by applying insulating varnish to the inner and outer sides of the bearing housing, using the bearing insulating sleeve, the conductive bolt insulating sleeve, and the spindle connection spacer, further ensuring the stability and safety of the circuit.

[0018] 4. The test bearing housing of the present invention has reserved vertical grooves at the 90° and 270° positions. Heating coils can be arranged in the grooves to heat the test part of the device, simulating the bearing operation conditions at a certain temperature.

[0019] 5. After the test bearing cover of the present invention is assembled with the test bearing seat, it squeezes the test bearing pair from both ends to generate an axial load. A wave spring and a wave spring fixing component are installed between the test bearing cover and the test bearing. By changing the tightness of the screw and coordinating with the deformation of the wave spring for quantitative analysis, and through the compressed wave spring and spring fixing component, the deformation is transferred as an axial load to the test bearing pair, so as to achieve precise axial load variable setting.

[0020] 6. The present invention has a torque sensor installed at the sensor pedal to measure the frictional torque generated when the test bearing is running. The two sets of tension and compression sensors work together to further reduce the test error caused by the asymmetry of the two sides of the mechanism structure and improve the test accuracy.

[0021] 7. The spindle and tapered sleeve of this invention adopt a precision tapered fit design, and the test bearing pair is installed and fixed by means of a locking nut. This tapered fit structure helps to improve the centering and positioning accuracy of the bearing, effectively reducing experimental errors caused by assembly clearance and eccentricity, thereby improving the reliability and repeatability of test data. All test components around the circumference of the test bearing housing adopt a symmetrical arrangement design, and the test bearing pair adopts a horizontal installation method, which can reduce the influence of the gravity of each part on the test error caused by the asymmetrical distribution of the test structure around the circumference. Attached Figure Description

[0022] Figure 1 This is a structural composition diagram of the present invention; Figure 2 This is an external view of the present invention; Figure 3 This is an assembly diagram of the transmission device; Figure 4 This is a schematic diagram of the assembly of the testing device; Figure 5 This is a schematic diagram of a lock nut. Among them, 1-base; 21-second gantry support shaft; 22-first motor bracket side plate; 23-motor bracket plate; 24-first gantry; 25-gantry carbon brush holder; 26-second gantry; 27-third gantry support shaft; 28-first gantry support shaft; 29-fourth gantry support shaft; 210-second motor bracket side plate; 31-servo motor; 32-coupling; 33-spindle; 34-tapered sleeve; 41-test bearing seat; 42-test bearing end cover; 43-wave spring; 44-wave... 45-Fixing spring retainer; 46-Locking nut; 47-First heating spacer; 48-First test bearing; 49-Test bearing inner ring bushing; 410-First conductive bolt; 411-Second test bearing; 412-Second heating spacer; 413-Oil baffle ring; 414-Sensor pedal; 415-First sensor mounting bracket; 416-Second sensor mounting bracket; 417-First torque sensor; 418-Second torque sensor; 419-Split carbon brush; 420-Second conductive bolt. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] This invention provides a vertical direct-drive multi-field coupled bearing friction torque measurement test bench, which can simulate the internal friction force generated by paired rolling bearings under axial load conditions, as well as the influence of external electric field environment and temperature environment on the friction force change, and realize high-precision measurement of bearing friction torque under multi-field coupled conditions.

[0025] A vertical direct-drive multi-field coupled bearing friction torque measurement test bench is provided, which can realize multi-field coupled working conditions of external load, external electric field and external temperature field, and can realize bearing friction torque measurement under complex working conditions. It includes: base plate 1, transmission device, support device and testing device.

[0026] The base plate 1 is fixedly supported on a horizontal surface; the support device is connected to the base plate 1 and is used to fix the transmission device and the testing device.

[0027] The transmission device includes a main shaft 33, a coupling 32, and a servo motor 31. The main shaft 33 is divided into a test section and a support section, with threads machined in the middle, and the surface of the support section is coated with insulating varnish. The bottom of the main shaft 33 is designed with a shoulder structure for axial positioning and installation of the oil retaining ring 413, effectively improving the reliability of the sealing structure. The surface of the main shaft 33 has a tapered structure, which, through cooperation with the tapered sleeve 34, the fixing nut 45, and the locking nut 46, enables precise installation and positioning of the test bearing pair, helping to improve assembly coaxiality and reduce installation errors.

[0028] The servo motor 31 is fixed on the base plate 1 by the motor bracket plate 23, the first motor bracket side plate 22, and the second motor bracket side plate 210. The output shaft of the servo motor 31 is connected to the lower part of the support section of the main shaft 33 through the coupling 32 to transmit torque.

[0029] The support device is used to support the main shaft 33. The support device includes a first gantry support shaft 28, a second gantry support shaft 21, a third gantry support shaft 27, a fourth gantry support shaft 29, a first motor bracket side plate 22, a second motor bracket side plate 210, a first gantry 24, a second gantry 26, a gantry carbon brush holder 25, a first sensor mounting bracket 415, a second sensor mounting bracket 416, washers, and fixing nuts.

[0030] The first gantry support shaft 28, the second gantry support shaft 21, the third gantry support shaft 27, and the fourth gantry support shaft 29 are mounted parallel to each other on the base plate 1. The first gantry 24 is mounted on the first gantry support shaft 28 and the second gantry support shaft 21, and the second gantry 26 is mounted on the third gantry support shaft 27 and the fourth gantry support shaft 29. The gantry carbon brush holder 25 is fixed between the first gantry 24 and the second gantry 26. The upper end of the main shaft 33 extends out of the mounting hole provided in the gantry carbon brush holder 25. The split carbon brush is fixed on the gantry carbon brush holder 25 and is connected to the middle part of the upper end of the main shaft 33. The split carbon brush 419 is a test circuit pole used to connect the main shaft 33 to the circuit.

[0031] The testing device includes a tapered sleeve 34, a test bearing housing 41, a test bearing end cover 42, a wave spring 43, a wave spring fixing piece 44, a test bearing inner ring bushing 49, a test bearing pair, a first conductive bolt 410, and a second conductive bolt 420; the test bearing pair includes a first test bearing 48 and a second test bearing 411.

[0032] A tapered sleeve 34 is fitted onto the test section of the spindle 33. The test bearing pair is interference-fitted onto the tapered sleeve 34, and the two are separated by the inner ring bushing 49 of the test bearing. The test bearing housing 41 is transition-fitted onto the outside of the test bearing pair. The test bearing housing 41 is fitted onto the spindle 33 by the tapered surface of the tapered sleeve 34 and is fixedly installed with a fixing nut 45. The inner ring of the test bearing pair is fixed to the tapered sleeve 34, and the outer ring of the test bearing pair is fixed to the test bearing housing 41. A wave spring 43 is mounted on the test bearing pair through a wave spring fixing member 44. The test bearing end cover 42 is installed on the end face of the test bearing housing 41 and axially presses the installed wave spring 43 and wave spring fixing member 44 to provide axial load to the test bearing pair. At the same time, the magnitude of the applied axial load is precisely adjusted and controlled by the deformation of the wave spring 43. The wave spring 43 transmits the axial force to the wave spring fixing member 44; the wave spring fixing member 44 and the test bearing seat 41 are clearance fit and have no axial interaction; the wave spring fixing member 44 finally transmits the axial load to the first test bearing 48.

[0033] The test bearing housing 41 has radially arranged slots. A first conductive bolt 410 and a second conductive bolt 420 are fixedly installed in these slots. The end faces of the first conductive bolt 410 and the second conductive bolt 420 are designed to be hemispherical, and the spherical surfaces maintain contact with the test bearing pair. One pole of the external circuit is connected to the first conductive bolt 410 and the second conductive bolt 420, and the other pole of the external circuit is connected to the spindle 33 via a split carbon brush 419. This establishes a circuit path from the external circuit to the spindle 33, the tapered sleeve 34, the test bearing, the conductive bolt 410, and the external circuit, thereby providing an external electric field environment for the test bearing pair. Both the inner and outer sides of the test bearing housing 41 are coated with insulating varnish.

[0034] The inner wall of the test bearing housing 41 is provided with a groove for mounting a heating coil. Energizing the heating coil raises the temperature of the test bearing housing 41, achieving an external temperature field for the test bearing. The groove can be located at the upper and lower ends of the test bearing, corresponding to the placement of a first heating coil 47 and a second heating coil 412, respectively. By energizing the coils, the temperature rise heats the working environment of the test bearing. Heating spacers prevent heat loss and maintain a stable temperature field, thus simulating an external temperature field.

[0035] The outer wall of the test bearing housing 41 is radially fixed to a sensor mounting plate 414, and two sensor mounting brackets are connected to each side, namely a first sensor mounting bracket 415 and a second sensor mounting bracket 416. Each mounting bracket is equipped with a torque sensor, namely a first torque sensor 417 and a second torque sensor 418. The two are symmetrically distributed with respect to the sensor mounting plate 414 and are used to measure the frictional torque generated by the test bearing during the test. The symmetrical design can effectively reduce the error caused by the asymmetrical distribution of the structure.

[0036] It should be noted that the external temperature field in this invention is achieved through a heating coil in the bearing housing groove. Similarly, an oil circuit structure is provided in the bearing housing, and the system temperature is regulated by circulating hot oil and cooling medium. Furthermore, the axial load is provided by the bolt preload of the bearing end cap, which is transmitted to the test bearing pair through a wave spring; alternatively, a mechanical lever-weight system can be used to apply a constant load, or a high-dynamic-response electric cylinder with real-time feedback and closed-loop control via a force sensor can be used for direct loading.

[0037] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vertical direct-drive multi-field coupled bearing friction torque measurement test bench, characterized in that, Includes transmission devices and testing devices; The transmission device includes a main shaft (33), a coupling (32), and a servo motor (31); the main shaft (33) is divided into a test section and a support section, and the surface of the support section is coated with insulating paint. The output shaft of the servo motor (31) is connected to the lower part of the support section of the main shaft (33) via a coupling (32) to transmit torque; The testing device includes a tapered sleeve (34), a test bearing housing (41), a test bearing end cap (42), a wave spring (43), a wave spring fixing piece (44), a test bearing inner ring bushing (49), a test bearing pair, a first conductive bolt (410), and a second conductive bolt (420); the test bearing pair includes a first test bearing (48) and a second test bearing (411). A tapered sleeve (34) is fitted onto the test section of the spindle (33), and the test bearing pair is interference-fitted onto the tapered sleeve (34). The two are separated by the inner ring bushing (49) of the test bearing. The test bearing housing (41) is transition-fitted onto the outside of the test bearing pair. The test bearing housing (41) is fitted onto the spindle (33) by the tapered surface of the tapered sleeve (34) and is fixedly installed with a fixing nut (45). The inner ring of the test bearing pair is fixed to the tapered sleeve (34), and the outer ring of the test bearing pair is fixed to the test bearing housing (41). The wave spring (43) is set on the test section through the wave spring fixing piece (44). Above the bearing pair, the test bearing end cap (42) is installed on the end face of the test bearing housing (41) and axially presses the installed wave spring (43) and wave spring fixing member (44) to provide axial load to the test bearing pair. At the same time, the magnitude of the applied axial load is precisely controlled by adjusting the deformation of the wave spring (43). The wave spring (43) transmits the axial force to the wave spring fixing member (44). The wave spring fixing member (44) and the test bearing housing (41) are clearance fit. The wave spring fixing member (44) finally transmits the axial load to the first test bearing (48). The test bearing housing (41) has a radially arranged slot. The first conductive bolt (410) and the second conductive bolt (420) are fixedly installed in the slot of the test bearing housing (41). The end faces of the first conductive bolt (410) and the second conductive bolt (420) are designed to be hemispherical, and the spherical surface is in contact with the test bearing pair. The first conductive bolt (410) and the second conductive bolt (420) are connected to one pole of the external circuit, and the spindle (33) is connected to the other pole of the external circuit through the split carbon brush (419), thereby providing an external electric field environment for the test bearing pair. The inner and outer sides of the test bearing housing (41) are coated with insulating varnish.

2. The vertical direct-drive multi-field coupled bearing friction torque measurement test bench as described in claim 1, characterized in that, It also includes a support device; the support device includes a first gantry support shaft (28), a second gantry support shaft (21), a third gantry support shaft (27), a fourth gantry support shaft (29), a first motor bracket side plate (22), a second motor bracket side plate (210), a first gantry (24), a second gantry (26), and a gantry carbon brush holder (25); The first gantry support shaft (28), the second gantry support shaft (21), the third gantry support shaft (27), and the fourth gantry support shaft (29) are installed parallel to each other on the base plate (1). The first gantry (24) is installed on the first gantry support shaft (28) and the second gantry support shaft (21), and the second gantry (26) is installed on the third gantry support shaft (27) and the fourth gantry support shaft (29). The gantry carbon brush holder (25) is fixed between the first gantry (24) and the second gantry (26). The servo motor (31) is fixed on the base plate (1) through the motor bracket plate (23) and the first motor bracket side plate (22) and the second motor bracket side plate (210). The upper end of the spindle (33) extends out of the mounting hole provided by the gantry carbon brush holder (25), the split carbon brush (419) is fixed on the gantry carbon brush holder (25), and it is connected to the middle part of the upper end of the spindle (33); the split carbon brush (419) is one pole of the circuit and is used to connect the spindle (33) to the circuit.

3. The vertical direct-drive multi-field coupled bearing friction torque measurement test bench as described in claim 1, characterized in that, The bottom of the main shaft (33) is designed with a shoulder structure for axial positioning and installation of the oil baffle ring (413).

4. The vertical direct-drive multi-field coupled bearing friction torque measurement test bench as described in claim 1, characterized in that, The surface of the spindle (33) is tapered, and the test bearing pair is installed and positioned by cooperating with the tapered sleeve (34), the fixing nut (45) and the locking nut (46).

5. The vertical direct-drive multi-field coupled bearing friction torque measurement test bench as described in claim 1, characterized in that, The inner wall of the test bearing housing (41) is provided with a wire groove, and a heating coil is installed inside to provide an external temperature field for the test bearing.

6. The vertical direct-drive multi-field coupled bearing friction torque measurement test bench as described in claim 5, characterized in that, The grooves are opened at the upper and lower ends of the test bearing pair, and the first heating coil (47) and the second heating coil (412) are respectively installed.

7. The vertical direct-drive multi-field coupled bearing friction torque measurement test bench as described in claim 2, characterized in that, The outer wall of the test bearing housing (41) is radially fixed to a sensor mounting plate (414), and two sensor mounting brackets are connected to each side, namely a first sensor mounting bracket (415) and a second sensor mounting bracket (416). Each mounting bracket is equipped with a torque sensor, namely a first torque sensor (417) and a second torque sensor (418), which are symmetrically distributed with respect to the sensor mounting plate (414) and are used to measure the frictional torque generated by the test bearing during the test.

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