A bearing lubrication performance measuring device under outer ring driving

Abstract

The application relates to a bearing lubrication performance measuring device under outer ring driving, and belongs to the technical field of lubrication experiments. The device comprises an operation platform, a driving device, a loading device, a testing device and a torque acquisition system. The driving device is connected with the testing device through a shaft coupling, drives the testing sleeve to rotate to simulate the driving working condition of the bearing outer ring; the loading device applies and measures the load on the testing bearing through a thrust bearing, a pressure sensor and a butterfly spring; the torque acquisition system acquires torque data in the testing process in real time. The testing main shaft and the loading shaft system are internally provided with oil channels, lubricant can be supplemented in time, and the butterfly spring in the supporting sleeve plays the roles of buffering and keeping the load stable. The device can truly simulate the high-speed rotating working condition of the bearing outer ring, synchronously measure torque, load and rotating speed parameters, the platform level can be adjusted through adjusting screws, the bearing pre-tightening force is adjustable, the testing bearing is convenient to replace, and the device is suitable for the testing and evaluation of the lubrication performance of space bearings.

Description

Technical Field

[0001] This invention relates to the field of lubrication testing technology, and in particular to a bearing lubrication performance measuring device driven by an outer ring. Background Technology

[0002] In spacecraft attitude control systems, inertial actuators such as bias momentum wheels and gyroscopes are core components, their performance directly affecting the spacecraft's maneuverability, pointing accuracy, and on-orbit lifespan. Bearing assemblies in these mechanisms typically operate with their outer rings rotating at high speeds. Due to the rotational characteristics of the outer rings, lubricants are more prone to evaporation and migration under centrifugal force. If the lubrication replenishment system cannot provide precise and timely replenishment, insufficient lubrication of the bearing assemblies will occur, leading to wear. Studies have shown that after long-term on-orbit operation, the tribological properties of bearings deteriorate, manifesting as increased operating current, abnormal noise, and even jamming, ultimately affecting the reliability of the entire mechanism. Therefore, in-depth research into the lubrication characteristics of space bearing assemblies is particularly important.

[0003] For the lubrication requirements of space bearing components, the total amount of lubricant that the bearing can carry is strictly limited due to the limited internal space of the spacecraft. Excessive oil supply will not only cause waste and pollution, but may also lead to insufficient oil supply later. Insufficient oil supply will directly aggravate bearing wear. Therefore, long-term and precise oil replenishment of space bearings has become a key problem that urgently needs to be solved in the aerospace field.

[0004] Currently, existing devices for evaluating bearing lubrication performance have many limitations: some devices cannot simulate the actual working conditions of outer ring drive, resulting in a large deviation between experimental data and the actual working state of the bearing; some devices can simulate working conditions, but it is difficult to simultaneously and accurately collect key parameters such as torque, load, and speed, and cannot fully reflect changes in lubrication performance; and some devices are complicated to operate during bearing replacement and lack precise lubricant replenishment structures, resulting in poor experimental repeatability and making it difficult to provide reliable experimental support for the design of space bearing lubrication systems.

[0005] To address the aforementioned problems, this invention proposes a bearing lubrication performance measurement device driven by an outer ring. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as difficulty in realistically simulating the working conditions of bearing outer ring drive, inability to simultaneously and accurately measure multiple parameters, cumbersome operation, and poor experimental repeatability. Therefore, this invention proposes a bearing lubrication performance measurement device under outer ring drive.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A bearing lubrication performance measuring device driven by an outer ring, comprising: The operating platform consists of a base, an upper plate, four support columns, and four clamping nuts. The four support columns are fixedly installed on the top of the base, and the upper plate is located above the four support columns. The threaded rods at the top of the support columns pass through the upper plate, and the clamping nuts are threadedly connected to the threaded rods and clamp the upper plate to provide support for the equipment. The drive unit includes a motor, with a motor mount fixedly installed on the top of the base, and the motor fixedly installed on one side of the motor mount to provide rotational power; The testing device and loading device are equipped with a spindle support fixedly installed on the top of the base. One end of the testing device is fixedly connected to the spindle support, and the other end is connected to the drive device. The loading device is located above the testing device and works with it. The motor drives the test sleeve of the testing device to rotate, thereby driving the outer ring of the test bearing to rotate, simulating the outer ring drive condition. The torque acquisition system is located between the drive unit and the test unit to collect torque data during the test process.

[0008] The loading device has a friction sleeve fixedly installed on the outer wall of the loading shaft sleeve of the loading device, and a friction sleeve of the test sleeve is fixedly installed on the outer wall of the test sleeve of the testing device. The friction sleeve of the loading device and the friction sleeve of the test sleeve are in contact, and the loading device applies a test load to the testing device to complete the bearing lubrication performance test.

[0009] The loading device includes a loading shaft system and an outer sleeve for the loading shaft system. The loading shaft system includes a main shaft, end caps I, a precision nut, loading bearings, and a collar. The outer sleeve and two end caps I are fitted onto the outer wall of the main shaft, and the end caps I are fixedly connected to the adjacent ends of the outer sleeve. The collar and two loading bearings are slidably fitted onto the outer wall of the main shaft, with the loading bearings located on both sides of the collar and their outer shaft walls engaging with the inner walls of the outer sleeve. The precision nut is threaded into the inner wall of one end cap I and fitted onto the main shaft. A preload is applied to the loading bearings through the precision nut to ensure the operational stability of the loading shaft system.

[0010] The loading device also includes two load testing systems located at both ends of the main shaft of the loading shaft system. Each load testing system includes a loading bolt and a support sleeve. The support sleeve is fixedly installed at the bottom of the upper plate. Two thrust bearing seats, a pressure sensor, and a loading rod are slidably disposed within the support sleeve. The loading bolt is threaded through the upper plate, and its bottom end is fixedly connected to the top of the upper thrust bearing seat. A single thrust bearing is fixedly installed between the two thrust bearing seats to achieve rotational engagement. The pressure sensor is fixedly installed at the bottom of the lower thrust bearing seat. A butterfly spring is provided between the loading rod and the pressure sensor, with its top and bottom ends fixedly connected to the bottom of the pressure sensor and the top of the loading rod, respectively. The bottom end of the loading rod passes through the support sleeve and is clamped to the main shaft of the loading shaft system by fixing clamps I and II. The load applied by the loading bolt is detected by the pressure sensor and transmitted to the loading shaft system, achieving precise load control.

[0011] The testing device has the same structure as the loading device, including a testing shaft system and a testing sleeve. The testing shaft system includes a testing spindle, end caps II, a preload nut, testing bearings, and a testing shaft system collar. One end of the testing spindle is fixedly connected to a spindle support. The outer wall of the testing spindle is fitted with a testing sleeve and two end caps II, which are fixedly connected to adjacent ends of the testing sleeve. The testing shaft system collar and two testing bearings are slidably fitted onto the outer wall of the testing spindle. The testing bearings are located on both sides of the testing shaft system collar, and their outer shaft walls mate with the inner wall of the testing sleeve. The preload nut is threaded into the inner wall of one end cap II and fitted onto the testing spindle. The preload nut applies a preload force to the testing bearings to ensure the operational accuracy of the testing shaft system.

[0012] The torque acquisition system includes a torque sensor base and a torque sensor body. The torque sensor base is fixedly installed on the top of a base, and the torque sensor body is fixedly installed on the top of the torque sensor base. A coupling is fixedly connected to one end of the torque sensor body's shaft, and the other end of the coupling is fixedly connected to the output shaft of the motor. A flexible coupling is fixedly connected to the other end of the torque sensor body's shaft, and the flexible coupling is fixedly connected to one end of the adjacent end cover II. The motor power is transmitted to the testing device through the torque sensor body, and at the same time, the torque sensor body collects torque data in real time, providing data support for lubrication performance analysis.

[0013] The base has four adjusting screws threaded through its bottom. These four adjusting screws are located near the four corners of the base, and foot supports are rotatably mounted on the bottom of each adjusting screw. By rotating the adjusting screws, the height of the foot supports can be adjusted to keep the operating platform level, ensuring the coaxiality of the shafts of the drive device, testing device, loading device, and torque acquisition system, and reducing measurement deviations.

[0014] Both the loading shaft system spindle and the test spindle have oil passages inside; the oil passages of the loading shaft system spindle correspond to the loading bearings, and the oil passages of the test spindle correspond to the test bearings; lubricant is replenished to the loading bearings and test bearings in a timely manner through the oil passages to avoid experimental deviations caused by insufficient or excessive lubrication, and to provide an experimental basis for studying precise oil replenishment strategies for space bearings.

[0015] During the test, lubricant is supplied to the test bearing through the oil passage of the test spindle, and lubricant is supplied to the load bearing through the oil passage of the load shaft spindle. Combined with torque data collected by the torque acquisition system, load data collected by the pressure sensor, and speed adjusted by the motor, multiple parameters such as torque, load, and speed are collected synchronously to comprehensively analyze the variation law of bearing lubrication performance under different working conditions.

[0016] In this application, the test bearings and load bearings are thoroughly cleaned before starting. First, the old lubricant in the bearings is removed by using a brush or cloth dampened with an appropriate amount of petroleum ether to clean the bearings. During the cleaning process, the bearings should be kept as still as possible to prevent impurities from falling into them. Then, they are cleaned again with anhydrous ethanol. After cleaning, the bearings are dried with a clean, soft cloth. The bearings should not be touched by hand to avoid corrosion caused by sweat. After cleaning, the bearings are placed on clean paper to check for any problems for subsequent assembly.

[0017] Next, adjust the adjusting screws at the bottom of the base to ensure the operating platform is level. Secure the motor and torque sensor body to the base of the operating platform using their respective mounting brackets. Then, install a coupling between the motor output shaft and the adjacent end of the torque sensor body. Connect the other end of the torque sensor body to end cap II at one end of the testing device via a flexible coupling, completing the connection of its power transmission structure.

[0018] Next, assemble the test spindle, test bearing, test shaft collar, and other components into the test sleeve in sequence. During installation, take care to protect critical mating surfaces to avoid scratches. Tighten the preload nut to apply appropriate preload force to the test bearing. Similarly, assemble the loading shaft system and preload the loading bearing using a precision nut. Fix one end of the assembled test spindle to the spindle support, and connect the end cap II of the other end of the test device to the drive unit via a coupling.

[0019] Next, install the support columns and upper plate of the installation platform and secure them with clamping nuts. Then, sequentially insert the loading rod, disc spring, pressure sensor, thrust bearing, and thrust bearing housing into the support sleeve, and fix the two assembled sleeves to the bottom of the upper plate. Finally, use fixing clamps to secure both ends of the loading shaft system spindle to the loading rods at both ends.

[0020] After completing the mechanical assembly, conduct a safety inspection. Manually rotate the shaft system to check for any jamming or abnormal noises; if any abnormalities are found, readjust the bearing preload or check the coaxiality of each component. After confirming that everything is correct, open the torque sensor body and check if its reading is within the normal range.

[0021] Afterwards, initial operation is carried out; the motor is started and run at a low speed for a period of time to allow the lubricant in the bearing to gradually distribute evenly and reach a stable working state. During this period, torque and speed data are monitored.

[0022] Once the formal testing phase begins, a load is applied to the loading shaft system by tightening the loading bolts. The load is transmitted through the thrust bearing, pressure sensor, disc spring, and loading rod to the fixed fixture, ultimately acting on the loading spindle. The pressure sensor reading is observed until the loading force reaches the preset test value. Simultaneously, the motor speed is adjusted to meet the test requirements. During the test, lubricant is replenished as needed through the internal oil passages of the spindle; data such as torque, speed, and load are continuously recorded.

[0023] After the test, all measurement data were saved. The data on torque, speed, and load changes over time were processed and analyzed to plot relationship curves and evaluate the impact of different operating parameters on lubrication performance.

[0024] When replacing the test bearing, first stop the motor and remove the loading system. Remove the test bearing and test spindle from the test sleeve, and use tools to remove the test bearing. Install the inner ring, cage, and outer ring of the new test bearing onto the shaft, and use a syringe to evenly fill the space between the rolling elements and the bearing housing with lubricant. Then install the test shaft system into the test sleeve and reinstall the loading system. Repeat the above steps.

[0025] Beneficial effects: The bearing lubrication performance measuring device under outer ring drive described in this invention can accurately simulate the actual working state of the outer ring drive of a spacecraft bearing. By driving the test sleeve of the test device to rotate through the drive device, the motion trajectory and force conditions of the test bearing are highly consistent with the actual application scenario, providing an experimental environment that fits the real working conditions for lubrication performance measurement, and effectively solving the problem of distortion in the working condition simulation of existing devices. In this invention, the bearing lubrication performance measuring device driven by the outer ring is equipped with a torque acquisition system that can capture torque data in real time during the test process, and a pressure sensor in the loading device that can accurately monitor the loaded load. Combined with the flexible adjustment of the speed by the driving device, it realizes the synchronous acquisition of multiple parameters such as torque, load, and speed, providing rich and accurate data support for a comprehensive analysis of the variation law of bearing lubrication performance under different working conditions, and facilitating in-depth evaluation of the influence of lubricant characteristics and working condition parameters on the lubrication effect. In this invention, the bearing lubrication performance measuring device under outer ring drive has oil passages inside both the test spindle and the loading shaft system spindle. Lubricant can be added in a timely manner as needed during the test, avoiding experimental deviations caused by insufficient or excessive lubrication, ensuring precise control of lubrication conditions, and providing a reliable experimental basis for studying precise oil replenishment strategies for space bearings. In this invention, the bearing lubrication performance measuring device driven by the outer ring can be conveniently adjusted to maintain the horizontal position of the operating platform by adjusting the screws at the bottom of the base, effectively ensuring the coaxiality of the shaft system. During bearing assembly, the preload of the test bearing and the load bearing can be flexibly adjusted by the preload nut and the precision nut, reducing measurement deviations caused by assembly errors or improper preload, and further improving data accuracy. In this invention, the bearing lubrication performance measuring device driven by the outer ring allows for bearing removal and replacement without disassembling the entire device structure. Only the loading system needs to be removed to take out the test bearing, making the operation simple and adaptable to the testing needs of different bearing models, thus greatly improving the versatility of the device. The steps of manually rotating the shaft system before testing to check for jamming and abnormal noise, and initially running at low speed to ensure uniform distribution of lubricant, can promptly eliminate abnormalities, ensure the stability of the formal testing process, further improve the reliability of measurement data, and provide strong experimental support for the optimized design of space bearing lubrication systems.

[0026] In this invention, the bearing lubrication performance measuring device is developed based on a precision angular contact ball bearing. It features a reasonable structural design, high overall rigidity, and easy assembly, disassembly, and maintenance of its main modules. The test bearings can be easily replaced, making the platform applicable to the testing of different bearing models and expanding its application range. The spindle has a dedicated lubrication channel, facilitating the simulation of different lubrication conditions and oil replenishment strategies during testing. This device has significant practical value for the selection of lubricants for space bearings, the formulation of oil supply strategies, and the evaluation of bearing manufacturing processes. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of a bearing lubrication performance measuring device under outer ring drive proposed in this invention; Figure 2 This is a cross-sectional structural schematic diagram of a bearing lubrication performance measuring device under outer ring drive proposed in this invention; Figure 3 This is a schematic diagram of the loading device and testing device of a bearing lubrication performance measuring device under outer ring drive proposed in this invention. Figure 4 This is a schematic diagram of the mounting structure of the fixing fixture and loading shaft main shaft of the bearing lubrication performance measuring device under outer ring drive proposed in this invention; Figure 5 This is a schematic diagram of the friction torque at different speeds during the testing process of a bearing lubrication performance measuring device driven by the outer ring proposed in this invention. Figure 6 This is a schematic diagram of the friction torque under different initial oil supply during the testing process of a bearing lubrication performance measuring device driven by the outer ring proposed in this invention.

[0028] In the diagram: 1. Loading device; 101. Fixture I; 102. Fixture II; 103. Friction sleeve of loading device; 104. Loading bolt; 105. Support sleeve; 106. Thrust bearing seat; 107. Thrust bearing; 108. Pressure sensor; 109. Disc spring; 110. Loading rod; 111. Outer sleeve of loading shaft system; 112. Main shaft of loading shaft system; 113. End cap I; 114. Precision nut; 115. Loading bearing; 116. Collar; 2. Testing device; 201. End cap II; 202. 1. Test sleeve friction sleeve; 203. Main shaft support seat; 204. Test sleeve; 205. Test shaft system collar; 206. Test main shaft; 207. Test bearing; 208. Preload nut; 3. Torque acquisition system; 301. Torque sensor base; 302. Torque sensor body; 4. Adjusting screw; 5. Operating platform; 501. Base; 502. Support column; 503. Upper plate; 504. Compression nut; 505. Motor base; 6. Drive device; 601. Motor; 602. Coupling; 603. Flexible coupling. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] In one embodiment: Refer to Figure 1-6 A bearing lubrication performance measuring device driven by an outer ring includes: an operating platform 5, a driving device 6, a loading device 1, a testing device 2, a torque acquisition system 3, and adjusting screws 4, etc.

[0031] In this embodiment, the operating platform 5 consists of a base 501, an upper plate 503, four support columns 502, and four clamping nuts 504. The four support columns 502 are vertically fixed on the top of the base 501, and the upper plate 503 is horizontally placed above the four support columns 502. The protruding threaded rods at the top of the four support columns 502 pass through the upper plate 503, and the four clamping nuts 504 are threadedly connected to the protruding threaded rods at the top of the four support columns 502 respectively. By tightening the clamping nuts 504, the upper plate 503 is pressed and fixed to the four support columns 502, providing stable support for the entire device.

[0032] In this embodiment, the drive device 6 includes a motor 601 and a motor mount 505. The motor mount 505 is fixedly mounted on the top of the base 501, and the motor 601 is fixedly mounted on one side of the motor mount 505 to provide rotational power for the test device 2.

[0033] In this embodiment, the loading device 1 is located above the testing device 2, and the two cooperate to complete the bearing test. The loading device includes a loading shaft system and a loading shaft system outer sleeve 111. The loading shaft system consists of a loading shaft system main shaft 112, end caps I 113, precision nuts 114, loading bearings 115, and a collar 116. The loading shaft system outer sleeve 111 and two end caps I 113 are sequentially fitted onto the outer wall of the loading shaft system main shaft 112. The two end caps I 113 are located at both ends of the loading shaft system outer sleeve 111 and are fixedly connected to the adjacent ends of the loading shaft system outer sleeve 111. The collar 116 and the two loading bearings 115 are slidably fitted onto the outer wall of the loading shaft system main shaft 112. The two loading bearings 115 are located on both sides of the collar 116, and the outer shaft wall mates with the inner wall of the loading shaft system outer sleeve 111. The precision nut 114 is threaded into the inner wall of one of the end caps I113 and is also sleeved on the outer wall of the main shaft 112 of the loading shaft system. By rotating the precision nut 114, a preload can be applied to the two loading bearings 115. The outer wall of the loading shaft system outer sleeve 111 is fixedly sleeved with a loading device friction sleeve 103.

[0034] In this embodiment, the loading device 1 has load testing systems installed at both ends of the main shaft 112 of the loading shaft system. Each load testing system includes a loading bolt 104 and a support sleeve 105, with the support sleeve 105 fixedly installed at the bottom of the upper plate 503. Inside the support sleeve 105, two thrust bearing seats 106, a pressure sensor 108, and a loading rod 110 are slidably arranged from top to bottom. The loading bolt 104 is threaded through the upper plate 503, and its bottom end is fixedly connected to the top of the upper thrust bearing seat 106. The same thrust bearing 107 is fixedly installed between the two thrust bearing seats 106 to achieve rotational engagement between the two thrust bearing seats 106. The pressure sensor 108 is fixedly installed at the bottom of the lower thrust bearing seat 106, and the loading rod 110 is located below the pressure sensor 108. A butterfly spring 109 is provided between the two, with the top and bottom ends of the butterfly spring 109 fixedly connected to the bottom of the pressure sensor 108 and the top of the loading rod 110, respectively. The bottom end of the loading rod 110 slides through the bottom of the support sleeve 105 and is fixedly installed with a fixing clamp I 101. The bottom of the fixing clamp I 101 is fixedly installed with a fixing clamp II 102 by bolts. The fixing clamp I 101 and the fixing clamp II 102 are clamped and sleeved on the outer wall of the loading shaft system main shaft 112, thus completing the fixation of one end of the loading shaft system main shaft 112.

[0035] In this embodiment, the testing device 2 has the same structure as the loading device 1, including a testing shaft system and a testing sleeve 204. The testing shaft system consists of a testing spindle 206, end caps II 201, preload nuts 208, testing bearings 207, and a testing shaft system collar 205. One end of the testing spindle 206 is fixedly connected to one side of the spindle support seat 203 fixed to the top of the base 501. The testing sleeve 204 and two end caps II 201 are sequentially fitted onto the outer wall of the testing spindle 206. The two end caps II 201 are located at both ends of the testing sleeve 204 and are fixedly connected to the adjacent ends of the testing sleeve 204. The testing shaft system collar 205 and two testing bearings 207 are slidably fitted onto the outer wall of the testing spindle 206. The two testing bearings 207 are located on both sides of the testing shaft system collar 205, and the outer shaft wall mates with the inner wall of the testing sleeve 204. The preload nut 208 is threaded into the inner wall of one end cap II 201 and is also sleeved on the outer wall of the test spindle 206. By rotating the preload nut 208, a preload force can be applied to the two test bearings 207. The outer wall of the test sleeve 204 is fixedly fitted with a test sleeve friction sleeve 202, which cooperates with the loading device friction sleeve 103.

[0036] In this embodiment, the torque acquisition system 3 is located between the drive device 6 and the transmission connection structure of the test device 2, and includes a torque sensor base 301 and a torque sensor body 302. The torque sensor body 302 is the same as that in the patent with publication number CN222049578U. The torque sensor base 301 is fixedly installed on the top of the base 501, and the torque sensor body 302 is fixedly installed on the top of the torque sensor base 301. One end of the torque sensor body 302 is fixedly connected to the output shaft of the motor 601 via a coupling 602, and the other end is fixedly connected to one end of the adjacent end cover II 201 of the test device 2 via a flexible coupling 603, thereby realizing the rotation drive of the test device 2 and acquiring torque data during the drive process.

[0037] This application can be used in the field of lubrication experimental technology, or in other fields applicable to this application.

[0038] In another embodiment: Reference Figure 1 , 3 The difference from the previous embodiment is that: four adjusting screws 4 are threaded through the bottom of the base 501 near the four corners, and a foot support is rotatably installed at the bottom of each adjusting screw 4. The height of the foot support can be adjusted by rotating the adjusting screw 4, thereby realizing the adjustment of the level of the equipment and stable support.

[0039] In this embodiment, both the loading shaft spindle 112 and the test spindle 206 are provided with corresponding oil passages, which cooperate with the corresponding loading bearing 115 and test bearing 207 to achieve lubrication of the corresponding bearings during the test.

[0040] However, as is well known to those skilled in the art, the working principles and wiring methods of the pressure sensor 108 and the motor 601 are conventional methods or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0041] The working principle and usage procedure of this technical solution are as follows: Before starting, thoroughly clean the test bearing 207 and the loading bearing 115. First, remove the old lubricant from the bearings by using a brush or cloth dipped in an appropriate amount of petroleum ether to clean the bearings. During the cleaning process, avoid rotating the bearings as much as possible to prevent impurities from falling into them. Then, clean them again with anhydrous ethanol. After cleaning, wipe the bearings dry with a clean, soft cloth. Do not touch the bearings with your hands to avoid corrosion caused by sweat. After cleaning, place the bearings on clean paper to check for any problems for subsequent assembly.

[0042] Next, adjust the adjusting screw 4 at the bottom of the base 501 to make the operating platform 5 level. Fix the motor 601 and the torque sensor body 302 to the base 501 of the operating platform 5 using their respective mounting brackets. Then, install a coupling 602 between the output shaft of the motor 601 and the adjacent end of the torque sensor body 302. The other end of the torque sensor body 302 is connected to the end cap II 201 at one end of the testing device 2 via a flexible coupling 603, completing the connection of its power transmission structure.

[0043] Next, assemble the test spindle 206, test bearing 207, test shaft collar 205, and other components into the test sleeve 204 in sequence. During installation, take care to protect the critical mating surfaces to avoid scratches. Tighten the preload nut 208 to apply a suitable preload force to the test bearing 207. Similarly, assemble the loading shaft system and preload the loading bearing 115 using the precision nut 114. Fix one end of the assembled test spindle 206 of the test device 2 to the spindle support 203, and connect the end cap II 201 of the other end of the test device 2 to the torque acquisition system 3 via a flexible coupling 603.

[0044] Next, install the support column 502 and upper plate 503 of the installation platform 5, and secure them using the clamping nut 504. Then, sequentially insert the loading rod 110, disc spring 109, pressure sensor 108, thrust bearing 107, and thrust bearing seat 106 into the support sleeve 105, and fix the two assembled sleeves to the bottom of the upper plate 503. Finally, use the fixing clamps to secure both ends of the loading shaft main shaft 112 to the loading rods 110 at both ends.

[0045] After completing the mechanical assembly, perform a safety inspection. Manually rotate the shaft system to check for any jamming or abnormal noise; if any abnormality is found, readjust the bearing preload or check the coaxiality of each component. After confirming that everything is correct, open the torque sensor body 302 and check if its reading is normal.

[0046] Afterwards, initial operation is carried out; motor 601 is started and run at a low speed for a period of time to allow the lubricant in the bearing to gradually distribute evenly and reach a stable working state. During this period, torque and speed data are monitored.

[0047] Upon entering the formal testing phase, a load is applied to the loading shaft system by tightening the loading bolt 104. The load is transmitted to the fixed fixture via the thrust bearing 107, pressure sensor 108, disc spring 109, and loading rod 110, ultimately acting on the loading spindle. The reading of the pressure sensor 108 is observed until the loading force reaches the preset test value. Simultaneously, the speed of the motor 601 is adjusted to meet the test requirements. During the test, lubricant is replenished as needed through the internal oil passages of the spindle; data such as torque, speed, and load are continuously recorded.

[0048] After the test, all measurement data were saved. The data on torque, speed, and load changes over time were processed and analyzed to plot relationship curves and evaluate the impact of different operating parameters on lubrication performance.

[0049] When replacing test bearing 207, first stop motor 601 and remove the loading system. Remove test bearing 207 and test spindle 206 from test sleeve 204, and use tools to remove test bearing 207. Install the inner ring, cage, and outer ring of the new test bearing 207 onto the shaft, and use a syringe to evenly fill the space between the rolling elements and the bearing housing with lubricant. Then install the test shaft system into test sleeve 204 and install the loading system. Repeat the above steps.

[0050] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bearing lubrication performance measuring device driven by an outer ring, characterized in that, include: The operating platform (5) consists of a base (501), an upper plate (503), four support columns (502) and four clamping nuts (504). The four support columns (502) are fixedly installed on the top of the base (501). The upper plate (503) is located above the four support columns (502). The threaded rod at the top of the support column (502) passes through the upper plate (503). The clamping nuts (504) are threadedly connected to the threaded rod and clamp the upper plate (503) to provide support for the equipment. The drive unit (6) includes a motor (601), a motor mount (505) is fixedly installed on the top of the base (501), and the motor (601) is fixedly installed on one side of the motor mount (505) to provide rotational power; The test device (2) and the loading device (1) are fixedly installed on the top of the base (501) with a spindle support seat (203). One end of the test device (2) is fixedly connected to the spindle support seat (203), and the other end is connected to the drive device (6). The loading device (1) is located above the test device (2) and is connected to it. The motor (601) drives the test sleeve (204) of the test device (2) to rotate so as to drive the outer ring of the test bearing (207) to rotate, simulating the outer ring drive condition. The torque acquisition system (3) is located between the drive device (6) and the test device (2) to acquire torque data during the test process.

2. The bearing lubrication performance measuring device under outer ring drive according to claim 1, characterized in that, The loading device (1) has a loading device friction sleeve (103) fixedly installed on the outer wall of the loading shaft sleeve (111), and the testing device (2) has a testing sleeve friction sleeve (202) fixedly installed on the outer wall of the testing sleeve (204). The loading device friction sleeve (103) and the testing sleeve friction sleeve (202) are in contact, and the loading device (1) applies a test load to the testing device (2) to complete the bearing lubrication performance test.

3. The bearing lubrication performance measuring device under outer ring drive according to claim 2, characterized in that, The loading device (1) includes a loading shaft system and a loading shaft system outer sleeve (111). The loading shaft system includes a loading shaft main shaft (112), end cap I (113), precision nut (114), loading bearing (115), and collar (116). The loading shaft main shaft (112) is fitted with the loading shaft system outer sleeve (111) and two end caps I (113) on its outer wall. The end caps I (113) are fixed to the adjacent ends of the loading shaft system outer sleeve (111). Connection; the collar (116) and two loading bearings (115) are slidably sleeved on the outer wall of the loading shaft main shaft (112), the loading bearings (115) are located on both sides of the collar (116) and the outer shaft wall is matched with the inner wall of the loading shaft outer sleeve (111); the precision nut (114) is threadedly matched with the inner wall of the end cover I (113) on one side and sleeved on the loading shaft main shaft (112), and the preload is applied to the loading bearing (115) through the precision nut (114).

4. The bearing lubrication performance measuring device under outer ring drive according to claim 3, characterized in that, The loading device (1) further includes two load testing systems located at both ends of the main shaft (112) of the loading shaft system. Each load testing system includes a loading bolt (104) and a support sleeve (105). The support sleeve (105) is fixedly installed at the bottom of the upper plate (503). Two thrust bearing seats (106), a pressure sensor (108), and a loading rod (110) are slidably disposed inside the support sleeve (105). The loading bolt (104) is threaded through the upper plate (503). The bottom end of the loading bolt (104) is fixedly connected to the top of the thrust bearing seat (106) located above. The same thrust shaft is fixedly installed between the two thrust bearing seats (106). The bearing (107) is used to achieve rotational engagement; the pressure sensor (108) is fixedly installed at the bottom of the thrust bearing seat (106) below; a butterfly spring (109) is provided between the loading rod (110) and the pressure sensor (108); the top and bottom ends of the butterfly spring (109) are fixedly connected to the bottom of the pressure sensor (108) and the top of the loading rod (110) respectively; the bottom end of the loading rod (110) passes through the support sleeve (105) and is clamped by the fixing clamp I (101) and the fixing clamp II (102) to the main shaft (112) of the loading shaft system; the load applied by the loading bolt (104) is transmitted to the loading shaft system after being detected by the pressure sensor (108).

5. The bearing lubrication performance measuring device under outer ring drive according to claim 4, characterized in that, The testing device (2) has the same structure as the loading device (1), including a testing shaft system and a testing sleeve (204). The testing shaft system includes a testing spindle (206), end caps II (201), a preload nut (208), a testing bearing (207), and a testing shaft system collar (205). One end of the testing spindle (206) is fixedly connected to the spindle support (203), and the outer wall is fitted with a testing sleeve (204) and two end caps II (201). The end caps II (201) are connected to the testing sleeve. (204) is fixedly connected to the adjacent ends; the test shaft collar (205) and two test bearings (207) are slidably sleeved on the outer wall of the test spindle (206), the test bearings (207) are located on both sides of the test shaft collar (205) and the outer shaft wall is matched with the inner wall of the test sleeve (204); the preload nut (208) is threadedly matched with the inner wall of the end cover II (201) on one side and sleeved on the test spindle (206), and the preload nut (208) applies a preload force to the test bearing (207).

6. The bearing lubrication performance measuring device under outer ring drive according to claim 5, characterized in that, The torque acquisition system (3) includes a torque sensor base (301) and a torque sensor body (302). The torque sensor base (301) is fixedly installed on the top of the base (501), and the torque sensor body (302) is fixedly installed on the top of the torque sensor base (301). A coupling (602) is fixedly connected to one end of the torque sensor body (302), and the other end of the coupling (602) is fixedly connected to the output shaft of the motor (601). A flexible coupling (603) is fixedly connected to the other end of the torque sensor body (302), and the flexible coupling (603) is fixedly connected to one end of the adjacent end cover II (201). The power of the motor (601) is transmitted to the test device (2) through the torque sensor body (302), and the torque sensor body (302) collects torque data in real time.

7. The bearing lubrication performance measuring device under outer ring drive according to claim 1, characterized in that, The base (501) has four adjusting screws (4) threaded through its bottom. The four adjusting screws (4) are located near the four corners of the base (501). The bottom of the adjusting screws (4) is rotatably mounted with foot supports. By rotating the adjusting screws (4), the height of the foot supports can be adjusted so that the operating platform (5) remains horizontal, ensuring the coaxiality of the shaft system of the drive device (6), the testing device (2), the loading device (1), and the torque acquisition system (3), and reducing measurement deviation.

8. The bearing lubrication performance measuring device under outer ring drive according to claim 5, characterized in that, Both the loading shaft main spindle (112) and the test main spindle (206) are provided with oil passages; the oil passage of the loading shaft main spindle (112) corresponds to the loading bearing (115), and the oil passage of the test main spindle (206) corresponds to the test bearing (207); lubricant is replenished to the loading bearing (115) and the test bearing (207) in a timely manner through the oil passages.

9. The bearing lubrication performance measuring device under outer ring drive according to claim 8, characterized in that, During the test, lubricant is supplied to the test bearing (207) through the oil passage of the test spindle (206), and lubricant is supplied to the loading bearing (115) through the oil passage of the loading shaft spindle (112). With the torque data collected by the torque acquisition system (3), the load data collected by the pressure sensor (108), and the speed adjusted by the motor (601), the torque, load, and speed are collected synchronously, and the variation law of bearing lubrication performance under different working conditions is comprehensively analyzed.

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