Multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench and detection method

Abstract

The invention relates to the technical field of bearing detection equipment, in particular to a multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench and a detection method, the test bench comprises a mounting base, a support unit, a transmission unit, a loading unit and a detection unit, the support unit, the transmission unit and the detection unit are all connected with the mounting base, and the loading unit is connected with the loading unit. The loading unit is connected with the detection unit, a main shaft of the supporting unit is divided into a detection section, a supporting section and a driving section, the detection section is connected with a detection bearing seat and a to-be-detected bearing set on the detection unit, the top of the detection bearing seat is connected with the sensor assembly, and a conductive mounting hole and a resistance wire mounting hole are formed in the detection bearing seat. By the adoption of the structure, the friction torque of the to-be-detected bearing pack can be measured under force-electricity-heat multi-field coupling loading, meanwhile, under-ring lubrication is carried out on the to-be-detected bearing pack, and high-precision measurement of the bearing friction torque integrating multiple factors is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing detection equipment, and particularly to a friction torque measurement test bench and detection method for a sub-ring lubricated bearing with multi-field coupling loading. Background Art

[0002] With the rapid development of fields such as medical devices, automobiles, aerospace, and military, precision manufacturing has put forward higher requirements for bearing performance. Modern bearings not only need to withstand complex multi-directional force loads, but also need to cope with working conditions of multi-field coupling loads such as different working environment temperatures and external electric fields. These complex working conditions pose severe challenges to the performance of bearings such as friction, wear, and lubrication, and also make it difficult for traditional single-load bearing test benches to meet the detection requirements. Therefore, developing a multi-field coupling loading test bench that can simulate actual working conditions is of great significance for in-depth study of the performance evolution law of bearings in complex environments, optimizing bearing design, and improving their service life. In addition, as an efficient lubrication method, sub-ring lubrication can effectively reduce bearing friction and temperature rise, but its lubrication mechanism and performance evaluation under complex working conditions still need further study.

[0003] At present, there is a lack of research means for the friction behavior of bearings in the energized state in the research on bearing friction tests, which is not conducive to the research and utilization of the influence of external electric fields on bearing lubrication. And traditional experimental devices usually do not support sub-ring lubrication and externally applied temperature fields, which limits the research on the friction characteristics of bearings under specific lubrication and working conditions. Therefore, a comprehensive test bench that can integrate the above multiple functions is even more lacking in the field of bearing friction tests, and thus cannot provide a comprehensive test and detection platform for scientific researchers to flexibly adjust parameters and simulate complex application scenarios. Summary of the Invention

[0004] The purpose of the present invention is to provide a friction torque measurement test bench and detection method for a sub-ring lubricated bearing with multi-field coupling loading, to obtain a friction torque measurement test bench for a bearing with multi-field coupling loading of force-electricity-therm and implementing sub-ring lubrication, which can integrally realize the comprehensive working conditions of externally applied electric fields, temperature fields, and force fields, and at the same time realize sub-ring lubrication for the bearing group to be detected and high-precision measurement of friction torque.

[0005] To achieve the above object, the present invention provides a friction torque measurement test bench for a lubricated bearing under a ring with multi-field coupling loading, including a mounting base, a support unit, a transmission unit, a loading unit, and a detection unit. The support unit, the transmission unit, and the detection unit are all connected to the mounting base, the loading unit is connected to the detection unit. The main shaft of the support unit is divided into a detection section, a support section, and a driving section. The detection section is connected to the detection bearing seat and the bearing group to be detected on the detection unit. The first under-ring lubrication through hole on the detection section communicates with the second under-ring lubrication through hole of the bearing group to be detected. The top of the detection bearing seat is connected to the sensor assembly, and the detection bearing seat is provided with a conductive mounting hole and a resistance wire mounting hole.

[0006] Preferably, the support bearing seat of the support unit is connected to the mounting base. The first support bearing, the second support bearing, and the third support bearing in the support bearing seat are all sleeved on the support section. One side of the first support bearing close to the detection unit is connected to the first support bearing cover. A first inner ring bushing is provided between the first support bearing and the second support bearing. A support bearing spacer is provided between the second support bearing and the third support bearing. One side of the third support bearing close to the transmission unit is connected to the second support bearing cover.

[0007] Preferably, the motor support base of the transmission unit is connected to the mounting base. The motor support base is connected with a motor through a motor support. The driving shaft of the motor is connected to the driving section through a coupling.

[0008] Preferably, the bearing group to be detected of the detection unit is connected to the detection section of the main shaft. A bearing insulating sleeve is provided between the bearing group to be detected and the detection bearing seat. A conductive bolt passes through the conductive mounting hole and the bearing insulating sleeve to contact the bearing group to be detected. A conductive bolt insulating sleeve is sleeved on the conductive bolt in the conductive mounting hole.

[0009] Preferably, a second inner ring bushing is provided between the first bearing to be detected and the second bearing to be detected of the bearing group to be detected. A wave spring and an observation cover plate are sequentially provided on one side of the first bearing to be detected away from the second bearing to be detected. The oil collecting box passes through the detection bearing seat to contact the bearing group to be detected. A baffle is provided on one side of the bearing group to be detected away from the oil collecting box. A detection bearing seat top cover is provided outside the wave spring. The detection bearing seat top cover is connected with a pre-tightening force sensor through a pre-tightening force bolt.

[0010] Preferably, the sensor mounting pedal of the sensor assembly is connected to the detection bearing seat. The sensor mounting pedal is located in the center of the sensor fixing frame. On both sides of the sensor mounting pedal, the sensor fixing frame is sequentially connected with a shock-absorbing element, an insulating block, a tension and compression sensor, and an insulating block. The sensor fixing frame is connected to the gantry, and the gantry is connected to the mounting base.

[0011] Preferably, mounting lugs are symmetrically arranged at both ends of the bearing housing. The mounting lugs are connected to the first hook of the loading unit. A weight tray is provided on the second hook connected to the first hook. The weight tray is connected to weights, and the bottom of the weight tray contacts the pressure sensor on the top of the lifting platform.

[0012] Preferably, the mounting base is provided with a detection groove at the detection unit, and the vertical projection of the first hook is located at the detection groove.

[0013] The detection method of the above-mentioned multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench includes the following steps: S1. Install the bearing group to be detected on the detection section of the main shaft, and connect the external circuit to the conductive bolt and the detection section respectively to form a circuit path of external circuit - detection section - bearing group to be detected - conductive bolt - external circuit, and apply an external electric field to the bearing group to be detected; S2. Install a resistance wire in the resistance wire installation hole, and heat the resistance wire to apply an external temperature field to the bearing group to be detected; S3. Apply a radial force load to the bearing group to be detected by placing weights on the weight tray; S4. Adjust the wave spring by adjusting the pre-tightening force bolt, and the wave spring applies an axial force load to the bearing group to be detected; S5. Select one or more of the detection conditions in S1 - S4, start the transmission unit to drive the bearing group to be detected to rotate, and measure the friction torque generated by the rotation of the bearing group to be detected through the tension and compression sensor.

[0014] Preferably, in S3, when the weights cannot provide an accurate radial force load, the lifting platform in contact with the weight tray is adjusted, and then the radial force load is accurately adjusted in cooperation with the pressure sensor.

[0015] Therefore, the present invention adopts the above-mentioned multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench and detection method, and its beneficial effects include: 1. The measurement test bench provided by the present invention can realize under-ring lubrication while detecting the friction torque under multi-field coupling loading of force - electricity - heat, that is, under-ring lubrication is implemented simultaneously under the external electric field, temperature field, radial force field and axial force field, realize the measurement of the friction torque of the bearing group to be detected (i.e., the first bearing to be detected and the second bearing to be detected), and allow dynamic adjustment of the strength of the external electric field, the oil supply situation of under-ring lubrication and the magnitude of the radial force load during the measurement process; 2. The measurement bearing housing provided by the present invention is provided with a plurality of conductive mounting holes symmetrically arranged along the circumference. The end of the conductive bolt connected to the conductive mounting hole is hemispherical, so that it is in firm contact with the outer ring of the bearing group to be detected, and the magnitude of the external electric field received by the bearing group to be detected is adjusted by adjusting the external circuit; 3. The detection bearing housing of the present invention has horizontally reserved resistance wire installation holes at 0° and 180° positions. The bearing group to be detected can be heated by placing heating resistance wires in the resistance wire installation holes to simulate the bearing operating conditions under different temperature environments. 4. The detection section of the present invention is provided with a tapered under-ring lubrication through-hole I for supplying lubricating oil under the ring. The centrifugal force generated by the rotation of the main shaft is used to throw the lubricating oil into the bearing group to be detected, thereby realizing under-ring lubrication of the bearing group to be detected. The oil collection box, front-side observation cover plate, and rear-side oil baffle fixed symmetrically on the circumference of the detection bearing housing can realize oil collection and sealing during the detection experiment. 5. The present invention applies an axial force load to the bearing group to be detected through a wave spring and a pre-tightening force bolt. After the pre-tightening force sensor is connected to the pre-tightening force bolt, the pre-tightening force is measured. By changing the tightening degree of the pre-tightening force bolt and cooperating with the pre-tightening force sensor, the pre-tightening force of the pre-tightening force bolt can be accurately adjusted, and it is transmitted to the bearing group to be detected as an axial force load through the compressed wave spring and spring fixing parts, enabling accurate setting of the axial force load variable. 6. The present invention is provided with a loading unit. The gravity generated by the weights can be transmitted to the detection bearing housing, thereby applying an equivalent radial force to the bearing group to be detected. This loading method can realize the simultaneous application of radial force load and axial force load without mutual influence, and allows the weights to be increased or decreased when the measurement test bench is working, thereby realizing a large dynamic change in the radial force load. A pressure sensor and a lifting platform are provided under the weight tray, and the height of the lifting platform can be adjusted when the measurement test bench is working, thereby realizing a dynamic micro-adjustment of the radial force load. 7. The present invention fixes tension and compression sensors on both sides above the bearing group to be detected. The tension and compression reactions can be used to measure the frictional torque generated during the operation of the detection bearing. The two groups of tension and compression sensors cooperate with each other to further reduce the test error caused by the asymmetry of the mechanism structure on both sides and improve the test accuracy. 8. Other sensors can also be connected to the detection bearing housing of the present invention for detection such as film thickness measurement.

[0016] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0017] Figure 1 is a schematic diagram of a multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench of the present invention; Figure 2 is a cross-sectional view of a multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench of the present invention; Figure 3 is a cross-sectional view of the support unit and drive unit of a multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench of the present invention; Figure 4 is a cross-sectional view of the detection unit of a multi-field coupling loaded under-ring lubricated bearing friction torque measurement test bench according to the present invention; Figure 5 is a side view of the detection unit of a multi-field coupling loaded under-ring lubricated bearing friction torque measurement test bench according to the present invention; Figure 6 is a schematic diagram of the bearing housing of a multi-field coupling loaded under-ring lubricated bearing friction torque measurement test bench according to the present invention.

[0018] Reference numerals: 1. Installation base; 2. Support unit; 21. Support bearing housing; 22. First support bearing; 23. Second support bearing; 24. Third support bearing; 25. First support bearing cover; 26. First inner ring bushing; 27. Support bearing spacer; 28. Felt ring; 29. Second support bearing cover; 3. Transmission unit; 31. Motor support base; 32. Motor support; 33. Motor; 34. Coupling; 4. Loading unit; 41. First hook; 42. Second hook; 43. Weight tray; 44. Lifting platform; 45. Pressure sensor; 5. Detection unit; 501. Bearing group to be detected; 502. Detection bearing housing; 503. Bearing insulation sleeve; 504. Conductive bolt; 505. Second inner ring bushing; 506. Oil baffle; 507. Wave spring; 508. Observation cover plate; 509. Oil collection box; 5010. Pre-tightening bolt; 5011. Pre-tightening force sensor; 5012. Sensor installation pedal; 5013. Sensor fixing bracket; 5014. Shock-absorbing element; 5015. Insulating block; 5016. Tensile and compressive force sensor; 5017. Installation lifting lug; 5018. Under-ring lubrication through hole one; 5019. Cone sleeve; 6. Main shaft; 61. Detection section; 62. Support section; 63. Drive section; 7. Gantry. Detailed implementation manners

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The above-mentioned features mentioned in the present invention or the features mentioned in the specific examples can be combined arbitrarily. These specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0020] Embodiment 1 As Figure 1 and Figure 2As shown in the figure, the present invention provides a friction torque measurement test bench for a sub-ring lubricated bearing with multi-field coupling loading, which includes a mounting base 1, a support unit 2, a transmission unit 3, a loading unit 4 and a detection unit 5. The support unit 2, the transmission unit 3 and the detection unit 5 are all connected to the mounting base 1, and the loading unit 4 is connected to the detection unit 5. The main shaft 6 of the support unit 2 is divided into a detection section 61, a support section 62 and a driving section 63. The detection section 61 is connected to the detection bearing seat 502 and the bearing group 501 to be detected on the detection unit 5. The sub-ring lubrication through hole 5018 on the detection section 61 is communicated with the sub-ring lubrication through hole 5019 of the bearing group 501 to be detected. The top of the detection bearing seat 502 is connected to the sensor assembly, and the detection bearing seat 502 is provided with a conductive mounting hole and a resistance wire mounting hole.

[0021] The support unit 2 supports the main shaft 6 by being hinged to the support section 62. The surfaces of the support section 62 and the driving section 63 of the main shaft 6 are both coated with insulating paint to ensure the stability and safety of the circuit. The transmission unit 3 drives the main shaft 6 to rotate, and then drives the bearing group 501 to be detected connected to the detection section 61 to rotate. The loading unit 4 applies a radial pressure to the bearing group 501 to be detected, and the detection unit 5 applies an axial pressure to the bearing group 501 to be detected and selects to apply an external electric field and a temperature field, and also measures the friction torque of the bearing group 501 to be detected.

[0022] As Figure 3 shown in the figure, the support bearing seat 21 of the support unit 2 is connected to the mounting base 1. The first support bearing 22, the second support bearing 23 and the third support bearing 24 in the support bearing seat 21 are all sleeved on the support section 62. One side of the first support bearing 22 close to the detection unit 5 is connected to the first support bearing cover 25, and a first inner ring bushing 26 is provided between the first support bearing 22 and the second support bearing 23. A support bearing spacer 27 is provided between the second support bearing 23 and the third support bearing 24, and one side of the third support bearing 24 close to the transmission unit 3 is connected to the second support bearing cover 29.

[0023] The first support bearing cover 25 axially positions the first support bearing 22, and the second bearing cover axially positions the third support bearing 24. The main shaft 6 sequentially passes through the first support bearing cover 25, the first support bearing 22, the first inner ring bushing 26, the second support bearing 23, the support bearing spacer 27, the third support bearing 24 and the second support bearing cover 29 until the support section 62 is connected to the support unit 2. At this time, both the detection section 61 and the driving section 63 are located outside the support unit 2.

[0024] Both ends of the support bearing housing 21 are respectively connected to the first support bearing cover 25 and the second support bearing cover 29. Gaskets are provided between the first support bearing cover 25 and the support bearing housing 21, and between the second support bearing cover 29 and the support bearing housing 21. An annular felt ring groove coaxial with the central hole is machined on the circumferential surface of the central holes of the first support bearing cover 25 and the second support bearing cover 29, and a felt ring 28 is installed in the annular felt ring groove. When the main shaft 6 passes through the central holes of the first support bearing cover 25 and the second support bearing cover 29, the outer circumferential surface of the main shaft 6 is in close contact with the inner circumferential surface of the felt ring 28, and the felt ring 28 plays a sealing role.

[0025] The motor support base 31 of the transmission unit 3 is connected to the mounting base 1. The motor support base 31 is connected with a motor 33 through a motor support 32. The drive shaft of the motor 33 is connected to the drive section 63 through a coupling 34. The motor 33 drives the drive section 63 to rotate through the drive shaft and the coupling 34, and provides torque and power to the bearing group 501 to be detected through the main shaft 6.

[0026] As Figure 4 shown, the bearing group 501 to be detected of the detection unit 5 is connected to the detection section 61 of the main shaft 6. A bearing insulating sleeve 503 is provided between the bearing group 501 to be detected and the detection bearing housing 502. A conductive bolt 504 passes through the conductive mounting hole and the bearing insulating sleeve 503 to contact the bearing group 501 to be detected, and a conductive bolt insulating sleeve is sleeved on the conductive bolt 504 in the conductive mounting hole.

[0027] The bearing group 501 to be detected is connected to the detection section 61 in the detection bearing housing 502. A first under-ring lubrication through-hole 5018 with a taper and a step is dug at the axis center of the detection section 61. The first under-ring lubrication through-hole 5018 is used as an oil filling channel for under-ring lubrication. When the main shaft 6 rotates, the bearing lubricating oil is controlled in the first under-ring lubrication through-hole 5018 of the detection section 61 by the inner conical surface and centrifugal force of the first under-ring lubrication through-hole 5018. The bearing lubricating oil can enter the interior of the bearing group 501 to be detected through the first under-ring lubrication through-hole 5018, the through-hole on the taper sleeve 5019, and the second radial under-ring lubrication through-hole machined on the inner ring of the bearing group 501 to be detected. The first under-ring lubrication through-hole 5018, the through-hole on the taper sleeve, and the second under-ring lubrication through-hole machined on the inner ring of the bearing group 501 to be detected are arranged at the offset of the axial central plane of the bearing group 501 to be detected, avoiding the bearing load area.

[0028] The detection bearing housing 502 is provided with a number of conductive mounting holes symmetrically arranged along the circumference. The symmetrical design can effectively reduce the error caused by the asymmetric structural distribution. The conductive bolt 504 is connected to the conductive mounting hole. The end face of the conductive bolt 504 is designed as a hemispherical shape, and the spherical surface is kept in contact with the bearing group 501 to be detected. The conductive bolt 504 is connected to the conductive mounting hole through the conductive bolt 504 insulating sleeve.

[0029] A second inner ring bushing 505 is provided between the first bearing to be detected and the second bearing to be detected of the bearing group 501 to be detected. A corrugated spring 507 and an observation cover plate 508 are successively provided on one side of the first bearing to be detected away from the second bearing to be detected. An oil collecting box 509 passes through the detection bearing housing 502 and contacts the bearing group 501 to be detected. A baffle plate 506 is provided on one side of the bearing group 501 to be detected away from the oil collecting box 509. A top cover of the detection bearing housing 502 is provided outside the corrugated spring 507, and a pre-tightening force sensor 5011 is connected to the top cover of the detection bearing housing 502 through a pre-tightening force bolt 5010.

[0030] The detection section 61 and the support section 62 of the main shaft 6 are connected by a tapered connecting spacer sleeve and screws. The connecting spacer sleeve is made of insulating material and is used for insulation and torque transmission. The support section 62 is provided with a tapered groove matching the taper of the detection section 61 to ensure corresponding connection between the support section 62 and the detection section 61. The detection bearing housing 502 is sleeved on the outside of the bearing group 501 to be detected with an interference fit. The detection bearing housing 502 and the bearing group 501 to be detected as a whole are sleeved on the detection section 61 by the tapered surface of a taper sleeve 5019 and are fixedly installed with a fixing nut. The function of the second inner ring bushing 505 is to transmit the axial pressure between the first bearing to be detected and the second bearing to be detected, and can realize the simulation of the axial force load condition of the bearing group 501 to be detected in pairs. The magnitude of the applied axial force load is precisely adjusted and controlled through the pre-tightening force sensor 5011.

[0031] The pre-tightening force sensor 5011 is used to measure the pre-tightening force of the pre-tightening force bolt 5010. The corrugated spring fixing part contacts the first bearing to be detected. The corrugated spring 507 is installed between the top cover of the detection bearing housing and the corrugated spring fixing part. By adjusting the pre-tightening force bolt 5010 to compress the corrugated spring 507, the bolt pre-tightening force is applied to the bearing group 501 to be detected as an axial force load through the transmission of the corrugated spring fixing part. The observation cover plate 508 is made of transparent material, which is convenient for observing the bearing group 501 to be detected during the test.

[0032] As Figure 5 shown, the sensor installation pedal 5012 of the sensor assembly is connected to the detection bearing housing 502, and the sensor installation pedal 5012 is located at the center of the sensor fixing frame 5013. On both sides of the sensor installation pedal 5012, the sensor fixing frame 5013 is successively connected with shock-absorbing elements 5014, insulating blocks 5015, tension and compression sensors 5016 and insulating blocks 5015. The sensor fixing frame 5013 is connected to the gantry 7, and the gantry 7 is connected to the installation base 1. The shock-absorbing element 5014 adopts the structure in the prior art. The tension and compression sensor 5016 is used to measure the frictional torque generated by the bearing group 501 to be detected during the detection process, and the symmetric design can effectively reduce the error caused by the asymmetric structural distribution.

[0033] As Figure 6As shown in the figure, mounting lugs 5017 are symmetrically provided at both ends of the bearing housing 502. The mounting lugs 5017 are connected to the first hook 41 of the loading unit 4. A weight tray 43 is provided on the second hook 42 connected to the first hook 41. The weight tray 43 is connected to weights, and the bottom of the weight tray 43 contacts the pressure sensor 45 on the top of the lifting platform 44.

[0034] The number of mounting lugs 5017 is one on each side of the bearing housing 502 to be detected. Horizontal resistance wire mounting holes are reserved at the 0° and 180° positions of the bearing housing 502 to be detected. The symmetrical design can effectively reduce the error caused by the asymmetric structural distribution. The resistance wire mounting holes of the bearing housing 502 to be detected can be used to install heating resistance wires. After the heating resistance wires are energized, they are used to increase the temperature of the bearing housing 502 to be detected and provide an externally applied temperature field with adjustable temperature for the bearing set 501 to be detected.

[0035] Weights are placed on the weight tray 43 to provide a radial force load for the bearing set 501 to be detected. When the radial force load provided for the bearing set 501 to be detected cannot be accurately adjusted by weights, the height of the lifting platform 44 can be adjusted to adjust the supporting force of the lifting platform 44 on the weights, and the magnitude of the radial force load provided for the bearing set 501 to be detected can be adjusted by reading the value of the pressure sensor 45.

[0036] The mounting base 1 is provided with a detection groove at the detection unit 5. The vertical projection of the first hook 41 is located at the detection groove. The setting of the detection groove ensures the smooth connection of the first hook 41 and the second hook 42.

[0037] Embodiment 2 Using the detection method of a multi-field coupling loading ring lubricated bearing friction torque measurement test bench in Embodiment 1, the method includes the following steps: S1. Install the bearing set 501 to be detected on the detection section 61 of the main shaft 6, and connect the external circuit to the conductive bolt 504 and the detection section 61 respectively to form a circuit path of external circuit - detection section 61 - bearing set 501 to be detected - conductive bolt 504 - external circuit, and apply an externally applied electric field to the bearing set 501 to be detected.

[0038] S2. Install resistance wires in the resistance wire mounting holes, and the heating resistance wires apply an externally applied temperature field to the bearing set 501 to be detected.

[0039] S3. Apply a radial force load to the bearing set 501 to be detected by placing weights on the weight tray 43.

[0040] In S3, when the weights cannot provide an accurate radial force load, the lifting platform 44 in contact with the weight tray 43 is adjusted, and then the radial force load is accurately adjusted in cooperation with the pressure sensor 45.

[0041] S4. Adjust the wave spring 507 by adjusting the pre-tightening force bolt 5010, and the wave spring 507 applies an axial force load to the bearing group 501 to be detected.

[0042] S5. Select the detection conditions in S1 - S4, start the drive unit 3 to drive the bearing group 501 to be detected to rotate, and measure the frictional torque generated by the rotation of the bearing group 501 to be detected through the tension and compression sensor 5016.

[0043] Therefore, by adopting the above-mentioned test bench and detection method for measuring the frictional torque of a lubricated bearing under a multi-field coupling load, the present invention can simulate the situation of internal frictional force generation in the bearing group to be detected under the condition of simultaneously bearing axial force load and radial force load, as well as the influence of an external electric field environment, temperature environment, and under-ring lubrication conditions on the change of its frictional force, so as to achieve high-precision measurement of the bearing frictional torque in multiple aspects.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements do not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench, characterized in that: It includes an installation base, a support unit, a transmission unit, a loading unit and a detection unit. The support unit, the transmission unit and the detection unit are all connected to the installation base, the loading unit is connected to the detection unit, the main shaft of the support unit is divided into a detection section, a support section and a drive section, the detection section is connected to the detection bearing seat and the bearing group to be detected on the detection unit, the under-ring lubrication through hole 1 on the detection section is connected to the under-ring lubrication through hole 2 of the bearing group to be detected, the top of the detection bearing seat is connected to the sensor assembly, and the detection bearing seat is provided with a conductive mounting hole and a resistance wire mounting hole.

2. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 1 is characterized by: The support bearing seat of the support unit is connected to the mounting base, and the first support bearing, the second support bearing and the third support bearing in the support bearing seat are all sleeved on the support section. The side of the first support bearing close to the detection unit is connected to the first support bearing cover, a first inner ring bushing is provided between the first support bearing and the second support bearing, a support bearing spacer is provided between the second support bearing and the third support bearing, and the side of the third support bearing close to the transmission unit is connected to the second support bearing cover.

3. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 1 is characterized by: The motor support base of the transmission unit is connected to the mounting base, the motor support base is connected to the motor through the motor support, and the driving shaft of the motor is connected to the driving section through a coupling.

4. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 1 is characterized by: The bearing group to be tested of the detection unit is connected to the detection section of the main shaft, a bearing insulation sleeve is provided between the bearing group to be tested and the detection bearing seat, the conductive bolt passes through the conductive mounting hole and the bearing insulation sleeve and contacts the bearing group to be tested, and the conductive bolt is provided with a conductive bolt insulation sleeve in the conductive mounting hole.

5. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 1 is characterized by: A second inner ring bushing is provided between the first bearing to be detected and the second bearing to be detected of the bearing group to be detected, a wave spring and an observation cover are provided in sequence on the side of the first bearing to be detected away from the second bearing to be detected, the oil collecting box passes through the detection bearing seat and contacts the bearing group to be detected, an oil baffle is provided on the side of the bearing group to be detected away from the oil collecting box, a detection bearing seat top cover is provided outside the wave spring, and the detection bearing seat top cover is connected to a preload sensor through a preload bolt.

6. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 1 is characterized by: The sensor mounting pedal of the sensor assembly is connected to the detection bearing seat. The sensor mounting pedal is located in the center of the sensor fixing frame. The sensor fixing frame is connected with shock absorbing elements, insulating blocks, tension and pressure sensors and insulating blocks on both sides of the sensor mounting pedal in sequence. The sensor fixing frame is connected to the gantry frame, and the gantry frame is connected to the mounting base.

7. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 1 is characterized by: The two ends of the detection bearing seat are symmetrically provided with mounting ears, the mounting ears are connected to the first hook of the loading unit, a weight tray is provided on the second hook connected to the first hook, the weight tray is connected to the weight, and the bottom of the weight tray is in contact with the pressure sensor on the top of the lifting platform.

8. The multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 7 is characterized by: The mounting base is provided with a detection groove at the detection unit, and the vertical projection of the first hook is located at the detection groove.

9. A detection method for a multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench, characterized in that: The method of using the multi-field coupling loaded under-ring lubricated bearing friction torque measurement test bench as described in any one of claims 1 to 8 comprises the following steps: S1. Install the bearing group to be tested on the detection section of the main shaft, connect the external circuit to the conductive bolt and the detection section respectively, form a circuit path of external circuit-detection section-bearing group to be tested-conductive bolt-external circuit, and apply an external electric field to the bearing group to be tested; S2. Install a resistance wire in the resistance wire installation hole, and heat the resistance wire to apply an external temperature field to the bearing group to be tested; S3, applying radial force load to the bearing group to be tested by placing weights on the weight tray; S4. The wave spring is adjusted by adjusting the preload bolt, and the wave spring applies an axial force load to the bearing group to be tested; S5. Select and apply one or more detection conditions in S1-S4, start the transmission unit to drive the bearing group to be detected to rotate, and measure the friction torque generated by the rotation of the bearing group to be detected through the tension and pressure sensor.

10. The detection method of the multi-field coupling loading under-ring lubrication bearing friction torque measurement test bench according to claim 9 is characterized in that: In S3, when the weight cannot provide accurate radial force load, the radial force load is accurately adjusted by adjusting the lifting platform in contact with the weight tray and then cooperating with the pressure sensor.

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