Bullet train bearing friction torque detection device and control method thereof

Abstract

The invention discloses a bullet train bearing friction torque detection device and a control method thereof, the bullet train bearing friction torque detection device comprises a mounting platform, one side of the upper end of the mounting platform is connected with a motor base, the upper end of the motor base is provided with a motor, and the output shaft end of the motor is connected with a torque sensor through a coupler; according to the invention, the running states of the train at different speeds within the speed range of 0-400km / h can be simulated, and a more real test environment is provided for the detection of the friction torque of the bearing; according to the invention, not only can the friction torque test be carried out on the railway vehicle axle box bearing, but also different loaded states can be simulated, and more comprehensive data support is provided for performance evaluation of the bearing; according to the invention, the total friction torque of the same test bearing in different loaded states can be tested with high precision; the pressure bearing assembly and the hydraulic assembly are reasonable in design, and stability and accuracy of test conditions can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of high-speed bearing running-in test, and in particular relates to a motor vehicle bearing friction torque detection device and a control method thereof. Background Art

[0002] The detection of friction torque of EMU bearings is an important part of ensuring the safety and performance of EMU operation, but the existing detection technology has the following disadvantages: 1. The existing equipment cannot simulate the state of the bearing when the train runs at a speed of 0-400km / h and record the relevant test parameters; 2. Existing equipment cannot test the friction torque of rail vehicle axle box bearings; 3. Existing equipment cannot perform high-precision testing of the total friction torque of the same test bearing under different load conditions. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a motor vehicle bearing friction torque detection device and a control method thereof, which effectively solves the problems raised in the above background.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a motor vehicle bearing friction torque detection device, comprising a mounting platform, a motor base is connected to one side of the upper end of the mounting platform, a motor is installed on the upper end of the motor base, a torque sensor is connected to the output shaft end of the motor through a coupling, a torque sensor base is provided at the lower end of the torque sensor, the torque sensor base is installed with the mounting platform, an electromagnetic clutch base is provided at the upper end of the mounting platform and located on one side of the torque sensor base, an electromagnetic clutch is installed on the upper part of the electromagnetic clutch base, and one end of the electromagnetic clutch is connected to the torque sensor; Two test bearing bases are arranged on the upper end of the mounting platform away from the motor base, and the upper ends of the two test bearing bases are connected to test bearing assemblies, and a mounting shaft is connected between the two test bearing assemblies, one end of the mounting shaft is connected to the electromagnetic clutch, and a small flywheel and a large flywheel are respectively arranged on the side of the two test bearing assemblies away from each other, and the small flywheel and the large flywheel are fixedly sleeved on the outside of the mounting shaft; An aluminum flywheel and a counterweight flywheel are respectively arranged on the side where the two test bearing assemblies are close to each other. The aluminum flywheel and the counterweight flywheel are both installed on the outside of the installation shaft through a tightening sleeve. A pressure bearing assembly is arranged between the aluminum flywheel and the counterweight flywheel and located outside the installation shaft. A hydraulic assembly is arranged outside the pressure bearing assembly. The hydraulic assembly is installed on the upper end of the installation platform, and the hydraulic assembly is located above the outside of the pressure bearing assembly. A circular grating ruler is connected to one end of the mounting shaft, a grating ruler sensor base is mounted on one side of the upper end of the mounting platform, a grating ruler sensor is mounted on one end of the grating ruler sensor base, and the grating ruler sensor is located on one side of the circular grating ruler.

[0005] Preferably, the pressure bearing assembly includes a cylindrical roller bearing symmetrically sleeved and installed on the outside of the mounting shaft, a pressure bearing seat is sleeved on the outside of the cylindrical roller bearing, both side ends of the pressure bearing seat are connected with sealing end covers, an oil flinger pan is provided between the sealing end cover and the cylindrical roller bearing, the oil flinger pan is sleeved and installed on the outside of the mounting shaft, a sealing ring is provided at the sleeve connection between the sealing end cover and the mounting shaft, a sealing retaining ring is provided on one side of the sealing ring, and the sealing retaining ring and the sealing end cover are connected by bolts.

[0006] Preferably, both side walls of the pressure bearing seat are connected to connecting blocks, one end of the connecting block is connected to a slider, a guide rail is slidably provided inside the slider, one end of the guide rail is fixedly connected to a guide rail seat, the guide rail seat is connected to the mounting platform, and one side of the guide rail seat and the upper and lower parts of the guide rail are connected to limiting blocks.

[0007] Preferably, the hydraulic assembly includes a support symmetrically installed on the upper end of the mounting platform, the upper end of the support is connected to a cross beam, a hydraulic cylinder is embedded in the center of the cross beam, the lower end of the hydraulic cylinder is connected to an arc-shaped pressure head, a pressure seat is provided outside the arc-shaped pressure head, the upper end of the pressure seat is connected to a pressure seat retaining ring, the lower end of the pressure seat is connected to a pressure sensor, the lower end of the pressure sensor is connected to a pressure plate, guide rods are connected to both sides of the upper end of the pressure plate, the upper part of the guide rod is movably penetrated by the cross beam, and a guide sleeve is embedded in the cross beam corresponding to the penetration position of the guide rod, and the guide rod is movably located in the guide sleeve.

[0008] Preferably, the test bearing assembly includes a test bearing sleeved with the mounting shaft, a bearing washer is provided on the step abutting end face of the test bearing and the mounting shaft, a round nut for locking is provided on the side of the test bearing away from the bearing washer, the round nut is threadedly connected to the mounting shaft, a test bearing seat is sleeved on the outside of the test bearing, the test bearing seat is located at the upper end of the test bearing base, a test bearing seat pressure cover is connected to the upper end of the test bearing seat, the test bearing seat and the test bearing seat pressure cover form a cavity, the test bearing is located in the cavity, and bearing retaining rings are connected to both side ends of the test bearing seat.

[0009] Preferably, temperature sensors are installed outside the two test bearing assemblies and the pressure bearing assembly.

[0010] Preferably, a vibration sensor is installed on one side of the exterior of the two test bearing assemblies.

[0011] Preferably, a control method for a motor vehicle bearing friction torque detection device is as follows: S1. Simulated speed test: The motor drive system is used to make the test bearing run in the speed range of 0-400 km / h, while recording the friction torque data measured by the torque sensor; S2. Load state test: Apply different pressures to the test bearing through the hydraulic components to simulate different load states and record the friction torque data under different pressures; S3. Data processing and analysis: Process and analyze the collected data to obtain the friction torque characteristics of the test bearing under different speeds and load conditions.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can simulate the running state of a train at different speeds within the speed range of 0-400 km / h, providing a more realistic test environment for the detection of bearing friction torque; 2. The present invention can not only test the friction torque of the rail vehicle axle box bearing, but also simulate different load conditions to provide more comprehensive data support for the performance evaluation of the bearing; 3. The present invention can perform high-precision testing on the total friction torque of the same test bearing under different load conditions; 4. The pressure bearing assembly and hydraulic assembly of the present invention are reasonably designed to ensure the stability and accuracy of the test conditions; 5. The sensor configuration and control method of the present invention can realize the comprehensive collection and processing of test data, and improve the efficiency and accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0014] In the attached picture: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 A top view of the present invention; Figure 4 is a cross-sectional view of the present invention; Figure 5 It is a schematic diagram of the installation structure of the temperature sensor of the present invention; Figure 6 It is a structural schematic diagram of the installation shaft and the components on the shaft of the present invention; Figure 7 For the present invention Figure 2 Schematic diagram of the enlarged structure of A; Figure 8 For the present invention Figure 6 A schematic diagram of the structure of B; Fig. 9 It is a structural schematic diagram of the pressure bearing seat of the present invention moving up and down; Fig.10 It is a structural schematic diagram of the hydraulic assembly of the present invention; Fig.11 It is a cross-sectional view of the hydraulic component of the present invention.

[0015] In the figure: 1. Installation platform; 2. Motor base; 3. Motor; 4. Coupling; 5. Torque sensor; 6. Torque sensor base; 7. Electromagnetic clutch base; 8. Electromagnetic clutch; 9. Test bearing base; 10. Test bearing assembly; 101. Test bearing; 102. Bearing washer; 103. Round nut; 104. Test bearing seat; 105. Test bearing seat gland; 106. Bearing retaining ring; 11. Installation shaft; 12. Small flywheel; 13. Large flywheel; 14. Aluminum flywheel; 15. Counterweight flywheel; 16. Pressure bearing assembly; 161. Cylindrical roller bearing; 162. Pressure bearing seat; 163. Sealing end Cover; 164, oil-slinging pan; 165, sealing ring; 166, sealing retaining ring; 167, connecting block; 168, slider; 169, guide rail; 1610, guide rail seat; 1611, limit block; 17, hydraulic assembly; 171, support; 172, crossbeam; 173, hydraulic cylinder; 174, arc pressure head; 175, pressure seat; 176, pressure seat retaining ring; 177, pressure sensor; 178, pressure plate; 179, guide rod; 1710, guide sleeve; 18, circular grating scale; 19, grating scale sensor base; 20, grating scale sensor; 21, temperature sensor; 22, vibration sensor; 23, expansion sleeve. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] Embodiment 1, by Figure 1-11 The present invention relates to a motor vehicle bearing friction torque detection device, comprising a mounting platform 1, a motor base 2 is connected to one side of the upper end of the mounting platform 1, a motor 3 is installed on the upper end of the motor base 2, a torque sensor 5 is connected to the output shaft end of the motor 3 through a coupling 4, a torque sensor base 6 is provided at the lower end of the torque sensor 5, the torque sensor base 6 is installed with the mounting platform 1, an electromagnetic clutch base 7 is provided at the upper end of the mounting platform 1 and located on one side of the torque sensor base 6, an electromagnetic clutch 8 is installed on the upper part of the electromagnetic clutch base 7, and one end of the electromagnetic clutch 8 is connected to the torque sensor 5; Two test bearing bases 9 are provided on the upper end of the mounting platform 1 away from the motor base 2, and the upper ends of the two test bearing bases 9 are connected to test bearing assemblies 10, and a mounting shaft 11 is connected between the insides of the two test bearing assemblies 10, and one end of the mounting shaft 11 is connected to the electromagnetic clutch 8. A small flywheel 12 and a large flywheel 13 are respectively provided on the side of the two test bearing assemblies 10 away from each other, and the small flywheel 12 and the large flywheel 13 are fixedly sleeved on the outside of the mounting shaft 11; An aluminum flywheel 14 and a counterweight flywheel 15 are respectively provided on the side where the two test bearing assemblies 10 are close to each other. The aluminum flywheel 14 and the counterweight flywheel 15 are fixedly sleeved and installed on the outside of the installation shaft 11 through a tightening sleeve 23. A pressure bearing assembly 16 is provided between the aluminum flywheel 14 and the counterweight flywheel 15 and located on the outside of the installation shaft 11. A hydraulic assembly 17 is provided on the outside of the pressure bearing assembly 16. The hydraulic assembly 17 is installed on the upper end of the installation platform 1, and the hydraulic assembly 17 is located above the outside of the pressure bearing assembly 16. A circular grating ruler 18 is connected to one end of the mounting shaft 11 , a grating ruler sensor base 19 is mounted on one side of the upper end of the mounting platform 1 , a grating ruler sensor 20 is mounted on one end of the grating ruler sensor base 19 , and the grating ruler sensor 20 is located on one side of the circular grating ruler 18 .

[0018] The pressure bearing assembly 16 includes a cylindrical roller bearing 161 symmetrically sleeved and installed on the outside of the installation shaft 11, a pressure bearing seat 162 is sleeved on the outside of the cylindrical roller bearing 161, and both side ends of the pressure bearing seat 162 are connected to sealing end covers 163, an oil-flinging plate 164 is provided between the sealing end cover 163 and the cylindrical roller bearing 161, and the oil-flinging plate 164 is sleeved and installed on the outside of the installation shaft 11, a sealing ring 165 is provided at the sleeve connection between the sealing end cover 163 and the installation shaft 11, a sealing retaining ring 166 is provided on one side of the sealing ring 165, and the sealing retaining ring 166 and the sealing end cover 163 are connected by bolts.

[0019] Both side walls of the pressure bearing seat 162 are connected with connecting blocks 167, one end of the connecting block 167 is connected with a slider 168, a guide rail 169 is slidably provided inside the slider 168, one end of the guide rail 169 is fixedly connected with a guide rail seat 1610, the guide rail seat 1610 is connected to the mounting platform 1, and one side of the guide rail seat 1610 and the upper and lower parts of the guide rail 169 are connected with limiting blocks 1611.

[0020] The hydraulic assembly 17 includes a support 171 symmetrically installed on the upper end of the mounting platform 1, the upper end of the support 171 is connected to a cross beam 172, a hydraulic cylinder 173 is embedded in the center of the cross beam 172, the lower end of the hydraulic cylinder 173 is connected to an arc-shaped pressure head 174, a pressure seat 175 is provided outside the arc-shaped pressure head 174, the upper end of the pressure seat 175 is connected to a pressure seat retaining ring 176, the lower end of the pressure seat 175 is connected to a pressure sensor 177, the lower end of the pressure seat 175 is connected to a pressure plate 178, the upper ends of the pressure sensors 177 are connected to guide rods 179 on both sides of the upper end of the pressure plate 178, the upper part of the guide rod 179 is movably penetrated by the cross beam 172, and a guide sleeve 1710 is embedded in the cross beam 172 at the penetration point of the guide rod 179, and the guide rod 179 is movably located in the guide sleeve 1710.

[0021] The test bearing assembly 10 includes a test bearing 101 which is sleeved with the installation shaft 11. A bearing washer 102 is provided on the step abutting end surface of the test bearing 101 and the installation shaft 11. A round nut 103 for locking is provided on the side of the test bearing 101 away from the bearing washer 102. The round nut 103 is threadedly connected to the installation shaft 11. A test bearing seat 104 is sleeved on the outside of the test bearing 101. The test bearing seat 104 is located at the upper end of the test bearing base 9. A test bearing seat pressure cover 105 is connected to the upper end of the test bearing seat 104. The test bearing seat 104 and the test bearing seat pressure cover 105 form a cavity. The test bearing 101 is located in the cavity. Bearing retaining rings 106 are connected to both side ends of the test bearing seat 104.

[0022] Temperature sensors 21 are installed outside the two test bearing assemblies 10 and the pressure bearing assembly 16 .

[0023] A vibration sensor 22 is installed on one side of the exterior of the two test bearing assemblies 10 .

[0024] Motor 3: Provides power to drive the shaft system to rotate. It has adjustable speed and braking functions and can be freely adjusted from 0 to 2400 rpm, corresponding to a train running speed of 0 to 400 km / h.

[0025] Torque sensor 5: collects the torque data of the bearing in real time and uploads it to the control system.

[0026] Electromagnetic clutch 8: controls the connection and disconnection between the motor 3 and the shaft system, it is engaged when power is on and disengaged when power is off.

[0027] Circular grating scale 18 and grating scale sensor 20: used to measure the rotation speed of the shaft system in real time and upload the data to the control system.

[0028] Hydraulic cylinder 173: generates pressure to simulate the stress condition of the bearing during operation.

[0029] Pressure sensor 177: collects the pressure data generated by the hydraulic cylinder 173 in real time and uploads it to the control system.

[0030] Temperature sensor 21: monitors the temperature of the bearing or detection device in real time and uploads the data to the control system.

[0031] Vibration sensor 22: monitors the vibration of the bearing or detection device in real time and uploads the data to the control system.

[0032] Working principle: Motor 3 drive and torque measurement: The motor 3 is mounted on the mounting platform 1 through the motor base 2, and its output shaft end is connected to the torque sensor 5 through the coupling 4; When the motor 3 is started, the torque sensor 5 and subsequent components are driven to rotate through the coupling 4; The torque sensor 5 is used to measure and record the friction torque data during the rotation process in real time; Simulated operation of test bearing 101: The test bearing assembly 10 includes a test bearing 101, a test bearing seat 104 and other components, and is connected to the electromagnetic clutch 8 via a mounting shaft 11; When the electromagnetic clutch 8 is closed, the power of the motor 3 is transmitted to the test bearing assembly 10 through the torque sensor 5 and the electromagnetic clutch 8, so that it simulates the running state of the train at different speeds; The arrangement of the small flywheel 12 and the large flywheel 13 helps to simulate the dynamic characteristics of the bearing at different speeds; Pressure application and load state test: The pressure bearing assembly 16 includes components such as a cylindrical roller bearing 161 and a pressure bearing seat 162, and applies different pressures to the test bearing 101 through a hydraulic assembly 17; The hydraulic cylinder 173, under the control of the hydraulic system, applies pressure to the pressure bearing seat 162 through the arc-shaped pressure head 174, and then transmits the pressure to the test bearing 101; The pressure sensor 177 is used to monitor and record the pressure value applied to the test bearing 101 in real time; Displacement measurement and data logging: The circular grating ruler 18 is used in conjunction with the grating ruler sensor 20 to accurately measure the displacement of the mounting shaft 11; The grating ruler sensor 20 converts the displacement into an electrical signal for recording and analysis; Temperature and vibration monitoring: The temperature sensor 21 is used to monitor the temperature change of the test bearing 101 during operation; The vibration sensor 22 is used to monitor the vibration of the test bearing 101 to evaluate its operating status and performance; Data processing and analysis: Subsequent data processing and analysis are performed by collecting data from the torque sensor 5, the pressure sensor 177, the grating scale sensor 20, the temperature sensor 21 and the vibration sensor 22.

[0033] Data processing and data analysis can ensure the accuracy and reliability of the data so as to comprehensively evaluate the performance of the test bearing 101.

[0034] In summary, the EMU bearing friction torque detection device provided by the present invention can achieve high-precision measurement and evaluation of the friction torque of the EMU bearing under different speeds and load conditions through the coordinated work of multiple systems such as motor 3 driving, torque measurement, pressure application and monitoring.

Claims

1. A motor vehicle bearing friction torque detection device, comprising a mounting platform (1), characterized in that: A motor base (2) is connected to one side of the upper end of the mounting platform (1), a motor (3) is mounted on the upper end of the motor base (2), an output shaft end of the motor (3) is connected to a torque sensor (5) via a coupling (4), a torque sensor base (6) is provided at the lower end of the torque sensor (5), the torque sensor base (6) is mounted on the mounting platform (1), an electromagnetic clutch base (7) is provided at the upper end of the mounting platform (1) and located on one side of the torque sensor base (6), an electromagnetic clutch (8) is mounted on the upper part of the electromagnetic clutch base (7), and one end of the electromagnetic clutch (8) is connected to the torque sensor (5); Two test bearing bases (9) are provided at the upper end of the mounting platform (1) away from the motor base (2), the upper ends of the two test bearing bases (9) are connected to test bearing assemblies (10), a mounting shaft (11) is connected between the insides of the two test bearing assemblies (10), one end of the mounting shaft (11) is connected to the electromagnetic clutch (8), and a small flywheel (12) and a large flywheel (13) are respectively provided at the sides of the two test bearing assemblies (10) away from each other, and the small flywheel (12) and the large flywheel (13) are both fixedly sleeved on the outside of the mounting shaft (11); An aluminum flywheel (14) and a counterweight flywheel (15) are respectively provided on the sides of the two test bearing assemblies (10) close to each other. The aluminum flywheel (14) and the counterweight flywheel (15) are both fixedly sleeved and installed on the outside of the installation shaft (11) through a tightening sleeve (23). A pressure bearing assembly (16) is provided between the aluminum flywheel (14) and the counterweight flywheel (15) and located on the outside of the installation shaft (11). A hydraulic assembly (17) is provided on the outside of the pressure bearing assembly (16). The hydraulic assembly (17) is installed on the upper end of the installation platform (1), and the hydraulic assembly (17) is located above the outside of the pressure bearing assembly (16). One end of the mounting shaft (11) is connected to a circular grating ruler (18), one side of the upper end of the mounting platform (1) is mounted with a grating ruler sensor base (19), one end of the grating ruler sensor base (19) is mounted with a grating ruler sensor (20), and the grating ruler sensor (20) is located on one side of the circular grating ruler (18).

2. A motor vehicle bearing friction torque detection device according to claim 1, characterized in that: The pressure bearing assembly (16) comprises a cylindrical roller bearing (161) symmetrically sleeved and mounted on the outside of the mounting shaft (11); a pressure bearing seat (162) is sleeved on the outside of the cylindrical roller bearing (161); both ends of the pressure bearing seat (162) are connected to sealing end covers (163); an oil-slinging plate (164) is provided between the sealing end cover (163) and the cylindrical roller bearing (161); the oil-slinging plate (164) is sleeved and mounted on the outside of the mounting shaft (11); a sealing ring (165) is provided at the sleeve joint between the sealing end cover (163) and the mounting shaft (11); a sealing retaining ring (166) is provided on one side of the sealing ring (165); and the sealing retaining ring (166) and the sealing end cover (163) are connected by bolts.

3. A motor vehicle bearing friction torque detection device according to claim 2, characterized in that: Both side walls of the pressure bearing seat (162) are connected to connecting blocks (167), one end of the connecting block (167) is connected to a slider (168), a guide rail (169) is slidably provided inside the slider (168), one end of the guide rail (169) is fixedly connected to a guide rail seat (1610), the guide rail seat (1610) is connected to the mounting platform (1), and one side of the guide rail seat (1610) and the upper and lower parts of the guide rail (169) are connected to limit blocks (1611).

4. The motor vehicle bearing friction torque detection device according to claim 1, characterized in that: The hydraulic assembly (17) comprises a support (171) symmetrically mounted on the upper end of the mounting platform (1); the upper end of the support (171) is connected to a crossbeam (172); a hydraulic cylinder (173) is embedded in the center of the crossbeam (172); the lower end of the hydraulic cylinder (173) is connected to an arc-shaped pressure head (174); a pressure seat (175) is provided outside the arc-shaped pressure head (174); the upper end of the pressure seat (175) is connected to a pressure seat retaining ring (176); The lower end of (175) is connected to a pressure sensor (177), the lower end of the pressure sensor (177) is connected to a pressure plate (178), and both sides of the upper end of the pressure plate (178) are connected to guide rods (179), the upper part of the guide rod (179) movably penetrates the cross beam (172), and a guide sleeve (1710) is embedded in the cross beam (172) at a position corresponding to the penetration of the guide rod (179), and the guide rod (179) is movably located in the guide sleeve (1710).

5. The motor vehicle bearing friction torque detection device according to claim 1, characterized in that: The test bearing assembly (10) comprises a test bearing (101) sleeved with a mounting shaft (11); a bearing washer (102) is provided on the step-butting end surface of the test bearing (101) and the mounting shaft (11); a round nut (103) for locking is provided on the side of the test bearing (101) away from the bearing washer (102); the round nut (103) is threadedly connected to the mounting shaft (11); a test bearing seat (104) is sleeved on the outside of the test bearing (101); the test bearing seat (104) is located at the upper end of the test bearing base (9); a test bearing seat pressure cover (105) is connected to the upper end of the test bearing seat (104); the test bearing seat (104) and the test bearing seat pressure cover (105) form a cavity; the test bearing (101) is located in the cavity; and bearing retaining rings (106) are connected to both side ends of the test bearing seat (104).

6. The motor vehicle bearing friction torque detection device according to claim 1, characterized in that: Temperature sensors (21) are installed outside the two test bearing assemblies (10) and the pressure bearing assembly (16).

7. The motor vehicle bearing friction torque detection device according to claim 1, characterized in that: A vibration sensor (22) is installed on one side of the exterior of the two test bearing assemblies (10).

8. A control method for a motor vehicle bearing friction torque detection device according to any one of claims 1 to 7, characterized in that: The control method is as follows: S1, simulated speed test: the test bearing (101) is driven by the motor (3) to run within a speed range of 0-400 km / h, while recording the friction torque data measured by the torque sensor (5); S2, load state test: applying different pressures to the test bearing (101) through the hydraulic assembly (17) to simulate different load states, and recording the friction torque data under different pressures; S3. Data processing and analysis: The collected data is processed and analyzed to obtain the friction torque characteristics of the test bearing (101) under different speeds and load conditions.

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