Retainer pocket and rolling body collision force measurement test bed

Abstract

The invention discloses a test bed for measuring collision force between a cage pocket and a rolling body. The test bed comprises a base, an inner ring supporting system, a loading system, a measuring system and a driving system, the inner ring supporting system, the loading system, the measuring system and the driving system are fixedly mounted on the base; the inner ring supporting system is used for supporting a tested inner ring of the tested unit; the loading system is connected with the inner ring supporting system and is used for applying a load to a tested inner ring through the inner ring supporting system; the driving system is used for fixedly installing a tested outer ring of a tested unit and driving the tested outer ring to rotate. The measuring system is used for being fixedly connected with a tested retainer of a tested unit and measuring the magnitude and the direction of collision force generated when a tested rolling body of the tested unit collides with the tested retainer. The test bed solves the problem that the collision force between the rolling body in the rolling bearing and the retainer cannot be quantitatively measured from the test angle in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of bearing testing technology, specifically relating to a test bench for measuring the collision force between the cage pocket and the rolling element. Background Technology

[0002] As a core transmission component of rotating machinery, the operational reliability of rolling bearings directly determines the service life and safety performance of the equipment. During high-speed, heavy-load, and variable-condition operation of bearings, the dynamic collision between the rolling elements and the cage is a key factor inducing bearing instability and cage fatigue failure. Therefore, conducting experimental measurements of the dynamic collision forces between the rolling elements and the cage under different operating conditions during the testing, verification, and structural optimization stages before mass production of bearings and bearing-like transmission components has become a crucial step in ensuring product reliability and lifespan.

[0003] However, existing rolling bearing measurement and testing rigs focus on the overall dynamic performance measurement and fault diagnosis methods of the bearing, without paying attention to the internal forces within the bearing. Therefore, they cannot optimize the structure, materials, and other parameters of the cage independently. Examples include Chinese invention patent applications CN202310854491.5 (Controllable Dynamic Excitation Test Device and Motion Test Method for Rolling Bearing Cages in Rotational State) and CN202410359004.2 (Small Sample Fault Diagnosis Method for Rolling Bearings Based on Twin Multi-Scale Residual Networks). Furthermore, research on the collision force between the cage pocket and rolling elements often employs theoretical simulation, such as Chinese invention patent application N202110918038.7 (Analysis Method for Lubrication Temperature Rise in High-Speed ​​Bearings). The simulation results rely on preset lubrication conditions, contact stiffness, and other manually set subjective parameters, lacking verification with actual measurement data.

[0004] This invention aims to address the shortcomings of existing technologies that cannot quantitatively measure the collision force between the rolling elements and the cage in rolling bearings from an experimental perspective. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a test bench for measuring the collision force between the cage pocket and the rolling elements, which solves the problem that existing technologies cannot quantitatively measure the collision force between the rolling elements and the cage in rolling bearings from a test perspective.

[0006] To achieve the above objectives, the present invention adopts the following specific technical solution:

[0007] A test bench for measuring the impact force between a cage pocket and a rolling element, the test bench comprising a base, an inner ring support system, a loading system, a measuring system, and a drive system;

[0008] The inner ring support system, the loading system, the measuring system, and the drive system are all fixedly installed on the base;

[0009] The inner ring support system is used to support the inner ring of the unit under test;

[0010] The loading system is connected to the inner ring support system and is used to apply a load to the inner ring under test through the inner ring support system.

[0011] The drive system is used to fix the outer ring of the unit under test in place and drive the outer ring of the unit under test to rotate.

[0012] The measurement system is used to be fixedly connected to the test cage of the unit under test, and to measure the magnitude and direction of the impact force of the test rolling element of the unit under test colliding with the test cage.

[0013] Furthermore, the inner ring support system includes a support bearing housing, a support bearing, a support shaft, a support plate, a limiting post, a rear positioning bracket, a front positioning bracket, a front locking nut, an inner ring support shaft, and an inner ring follower bearing.

[0014] The two support bearing seats are fixedly mounted on the top surface of the base relative to each other;

[0015] Each of the support bearing housings is equipped with one of the support bearings.

[0016] The support shaft is arranged in a horizontal direction and its two ends are rotatably mounted on the two support bearings.

[0017] The bottom surface of one end of the support plate is supported on the support bearing, and the top of the other end is fixedly connected to the rear positioning bracket and the front positioning bracket, and the middle part is fixedly connected to the limiting post; the rear positioning bracket is located between the front positioning bracket and the limiting post.

[0018] The limiting post is located between the support plate and the base, and the height of the limiting post is slightly less than the distance between the vertex of the support shaft and the top surface of the base;

[0019] The inner ring support shaft is fixedly connected to the rear positioning bracket and the front positioning bracket, and can rotate with the support plate; the front end of the inner ring support shaft and the front locking nut together clamp the inner ring follower bearing, thereby installing the inner ring to be tested on the inner ring support shaft.

[0020] Furthermore, the inner ring support system also includes a rear locking nut that is threadedly connected to the inner ring support shaft. The rear locking nut and the inner ring support shaft clamp the rear positioning bracket in the middle, thereby restricting the circumferential rotation and axial movement of the inner ring support shaft.

[0021] Both the rear positioning bracket and the front positioning bracket are fixedly connected to the support plate by bolts and supporting connecting angle irons;

[0022] The limiting post is fixedly connected to the support plate by bolts.

[0023] Furthermore, the loading system includes a loading support rod, a loading beam, a loading threaded rod, a tension sensor, a loading spring, and a loading bolt;

[0024] The two loading support rods are arranged vertically and symmetrically distributed on both sides of the support plate. The bottom end is fixedly installed on the base, and the top end is fixedly connected to the loading crossbeam.

[0025] The loading threaded rod, the tension sensor, the loading spring, and the loading bolt are connected in sequence from top to bottom in the vertical direction;

[0026] The loading threaded rod is helically engaged with the loading crossbeam, and its up-and-down movement is controlled by rotating the loading threaded rod;

[0027] The bottom end of the loading bolt is threaded to the top end of the rear positioning bracket.

[0028] Furthermore, threaded holes are provided at the top of both the loading beam and the rear positioning bracket;

[0029] The loading threaded rod is helically engaged with the threaded hole of the loading crossbeam;

[0030] The loading bolt is threadedly connected to the threaded hole at the top of the rear positioning bracket.

[0031] Furthermore, the measurement system includes a measurement support rod, a measurement support beam, and a three-dimensional force sensor;

[0032] The two measuring support rods are arranged vertically and symmetrically distributed on both sides of the support plate. The bottom end is fixedly installed on the base, and the top end is fixedly connected to the measuring support beam.

[0033] The three-dimensional force sensor is fixedly installed at the front end of the measuring support beam;

[0034] The three-dimensional force sensor is used for fixed connection with the cage being tested.

[0035] Furthermore, the measurement system also includes a measurement connection angle iron, a sensor connector, and a cage connection flange;

[0036] The sensor connector is fixed to the front end of the measuring support beam by the measuring connecting angle iron and bolts;

[0037] The three-dimensional force sensor is fixedly connected between the sensor connector and the cage connecting flange.

[0038] Furthermore, the cage connecting flange has a locking structure;

[0039] The cage under test has a fixed cantilever beam;

[0040] The locking structure is used to clamp the fixed cantilever beam and is fixed by bolts and nuts.

[0041] Furthermore, the drive system includes a drive bearing housing, a drive motor, and a motor bracket;

[0042] The motor bracket is fixedly installed on the base;

[0043] The drive motor is fixedly mounted on the motor bracket and is used to drive the drive bearing seat to rotate;

[0044] The drive bearing housing is used to fix the outer ring being measured, and the axial length of the drive bearing housing is less than the axial length of the outer ring being measured.

[0045] Furthermore, the outer ring being tested is installed in the drive bearing housing with an interference fit.

[0046] Furthermore,

[0047] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0048] The cage pocket and rolling element collision force measurement test bench of the present invention enables the measurement of the collision force between the cage and the rolling element and the observation of the collision behavior between the cage and the rolling element. This allows for the prediction of the cage's life and dynamic behavior, or the optimization of the shape, material, and physical properties of the lubricating oil of the pocket, in order to improve the performance of the bearing.

[0049] The cage pocket and rolling element collision force measurement test bench of the present invention can indirectly apply a radial load that can be adjusted in real time to ensure measurement accuracy. It can flexibly replace test units, simplify the test process, and broaden the application range of the test bench. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the structure of the test bench for measuring the collision force between the cage pocket and the rolling element according to the present invention;

[0051] Figure 2 This is a schematic diagram of the inner ring support system.

[0052] Figure 3 This is a schematic diagram of the loading system.

[0053] Figure 4 This is a schematic diagram of the measurement system.

[0054] Figure 5This is a schematic diagram of the test unit structure;

[0055] Figure 6 This is a schematic diagram of the drive system.

[0056] Figure 7 A schematic diagram of the cage-connected flange.

[0057] Figure label:

[0058] 1-Base, 2-Inner ring support system, 3-Loading system, 4-Measuring system, 5-Test unit, 6-Drive system, 201-Support bearing housing, 202-Support bearing, 203-Support shaft, 204-Support plate, 205-Limiting post, 206-Rear positioning bracket, 207-Front positioning bracket, 208-Support connecting angle iron, 209-Rear locking nut, 210-Front locking nut, 211-Inner ring support shaft, 212-Inner ring follower bearing, 301-Loading support rod, 302-Loading crossbeam, 30 3-Loading threaded rod, 304-Tension sensor, 305-Loading spring, 306-Loading bolt, 401-Measuring support rod, 402-Measuring support beam, 403-Measuring connecting angle iron, 404-Sensor connector, 405-Three-dimensional force sensor, 406-Cage connecting flange, 501-Measured inner ring, 502-Measured rolling element, 503-Measured outer ring, 504-Measured cage, 601-Drive bearing housing, 602-Drive motor, 4061-Locking structure, 5041-Fixed cantilever beam. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] This invention provides a test bench for measuring the impact force between a cage pocket and a rolling element, such as... Figure 1As shown, the test bench includes a base 1, an inner ring support system 2, a loading system 3, a measuring system 4, and a drive system 6. The base 1 serves as the foundation of the entire test bench, providing horizontal and stable support for the inner ring support system 2, the loading system 3, the measuring system 4, and the drive system 6. The inner ring support system 2, the loading system 3, the measuring system 4, and the drive system 6 are all fixedly mounted on the base 1. The test unit 5 is the bearing under test, and includes a test outer ring 503, a test inner ring 501, a test cage 504, and a test rolling element 502. The test rolling element 502 is installed in the pocket of the test cage 504 and is located between the test inner ring 501 and the test outer ring 503.

[0061] The inner ring support system 2 is used to support the inner ring 501 under test of the test unit 5; such as Figure 1 and Figure 2 As shown, the inner ring support system 2 includes a support bearing housing 201, a support bearing 202, a support shaft 203, a support plate 204, a limiting post 205, a rear positioning bracket 206, a front positioning bracket 207, a support connecting angle iron 208, a rear locking nut 209, a front locking nut 210, an inner ring support shaft 211, and an inner ring follower bearing 212. Two support bearing housings 201 are arranged opposite to each other, and their bottom ends can be fixed to the top surface of the base 1 with bolts, providing a mounting base for the support bearing 202 and thus supporting the support bearing 202, thereby achieving horizontal installation of the support shaft 203. One support bearing 202 is installed in each support bearing housing 201. The support shaft 203 is arranged horizontally and its two ends are rotatably mounted on the two support bearings 202. One end of the support plate 204 is supported on the support bearing 202, so that one end of the inner ring support system 2 is suspended. The top of the other end is fixedly connected to the rear positioning bracket 206 and the front positioning bracket 207 by bolts and the support connecting angle iron 208. The bottom surface in the middle is fixedly connected to the limit post 205 by bolts. The rear positioning bracket 206 is located between the front positioning bracket 207 and the limit post 205. The limit post 205 is located between the support plate 204 and the base 1, and the height of the limit post 205 is slightly less than the distance between the apex of the support shaft 203 and the top surface of the base 1, so that the limit post 205 just does not contact the frame. The inner ring support shaft 211 is fixedly connected to the rear positioning bracket 206 and the front positioning bracket 207 and can rotate with the support plate 204. The front end of the inner ring support shaft 211 and the front locking nut 210 together clamp the inner ring follower bearing 212, so that the inner ring 501 to be measured is installed on the inner ring support shaft 211. The rear locking nut 209 is threadedly connected to the inner ring support shaft 211. The rear locking nut 209 and the inner ring support shaft 211 clamp the rear positioning bracket 206 in the middle, thereby restricting the circumferential rotation and axial movement of the inner ring support shaft 211.

[0062] Loading system 3 is connected to inner ring support system 2 and is used to apply load to the inner ring 501 being measured through inner ring support system 2; for example Figure 1 and Figure 3 As shown, the loading system 3 includes a loading support rod 301, a loading crossbeam 302, a loading threaded rod 303, a tension sensor 304, a loading spring 305, and a loading bolt 306. Two loading support rods 301 are arranged vertically and symmetrically distributed on both sides of the support plate 204. Their bottom ends are fixed to the base 1 with bolts, and their top ends are fixedly connected to the loading crossbeam 302. The loading threaded rod 303, tension sensor 304, loading spring 305, and loading bolt 306 are connected sequentially from top to bottom vertically. The loading threaded rod 303 is screwed into the loading crossbeam 302, and its vertical movement is controlled by rotating the loading threaded rod 303. This allows for the indirect application of a real-time adjustable radial load, ensuring the accuracy of the collision force measurement. The bottom end of the loading bolt 306 is threadedly connected to the top end of the rear positioning bracket 206. Both the loading beam 302 and the rear positioning bracket 206 have threaded holes at their top ends; the loading threaded rod 303 is screwed into the threaded hole of the loading beam 302; and the loading bolt 306 is threaded into the threaded hole at the top end of the rear positioning bracket 206. The loading system 3 is connected to the rear positioning bracket 206 of the inner ring support system 2 via the loading bolt 306, rather than to the tested unit 5. By leveraging the support plate 204, a load with a constant direction is applied to the moving parts, reducing the influence of the loading system 3 on the measurement results, improving the accuracy of the impact force measurement, and simultaneously enabling dynamic adjustment of the load during the test.

[0063] The drive system 6 is used to fix the outer ring 503 of the test unit 5 in place and to drive the outer ring 503 to rotate; for example Figure 1 and Figure 6 As shown, the drive system 6 includes a drive bearing housing 601, a drive motor 602, and a motor bracket (not shown in the figure); the motor bracket is fixedly installed on the base 1; the drive motor 602 is fixedly installed on the motor bracket, and the output shaft of the drive motor 602 is coaxially fixedly connected to the drive bearing housing 601 to drive the drive bearing housing 601 fixedly connected to it to rotate; the drive bearing housing 601 is used to fix the outer ring 503 to be tested, such as: the outer ring 503 to be tested is installed in the drive bearing housing 601 with an interference fit, and the axial length of the drive bearing housing 601 is less than the axial length of the outer ring 503 to be tested, so that the outer ring 503 to be tested can be exposed outside the drive bearing housing 601 during the test, and the collision behavior between the cage and the rolling elements can be directly observed during the test.

[0064] The measurement system 4 is used to fix and connect to the test cage 504 of the test unit 5, and to measure the magnitude and direction of the impact force of the test rolling element 502 of the test unit 5 colliding with the test cage 504. Figure 1 and Figure 4 As shown, the measurement system 4 includes a measuring support rod 401, a measuring support beam 402, a three-dimensional force sensor 405, a measuring connecting angle iron 403, a sensor connector 404, and a cage connecting flange 406. Two measuring support rods 401 are arranged vertically and symmetrically distributed on both sides of the support plate 204. Their bottom ends can be fixed to the base 1 with bolts, and their top ends are fixedly connected to the measuring support beam 402. A three-dimensional force sensor 405 is fixedly installed at the front end of the measuring support beam 402; the three-dimensional force sensor 405 is used to fixally connect to the cage 504 being measured. The sensor connector 404 is fixed to the front end of the measuring support beam 402 via the measuring connecting angle iron 403 and bolts; the three-dimensional force sensor 405 is fixedly connected between the sensor connector 404 and the cage connecting flange 406, that is, the rear end of the three-dimensional force sensor 405 is fixedly connected to the sensor connector 404, and the front end is fixedly connected to the cage connecting flange 406; the cage connecting flange 406 is used to fixally connect to the cage 504 being measured. Figure 4 , Figure 5 and Figure 7 As shown, the cage connecting flange 406 has a locking structure 4061; the cage under test 504 has a fixed cantilever beam 5041; the locking structure 4061 is used to clamp the fixed cantilever beam 5041, and the locking structure 4061 is fixed to the fixed cantilever beam 5041 by bolts and nuts, thereby transmitting the collision force to the three-dimensional force sensor 405 to realize the measurement of the instantaneous magnitude and direction of the collision force. The outer ring 503 under test is not completely covered by the drive bearing housing 601, and the side where the measuring system 4 and the inner ring support system 2 are located is open, which facilitates the observation of the collision behavior between the cage pocket and the rolling elements during the test.

[0065] The aforementioned cage pocket and rolling element collision force measurement test bench enables the measurement of the collision force between the cage and rolling elements and the observation of the collision behavior between the cage and rolling elements. This allows for the prediction of the cage's lifespan and dynamic behavior, or the optimization of the shape, material, and lubricant properties of the pocket to improve bearing performance.

[0066] The aforementioned cage pocket and rolling element collision force measurement test bench can indirectly apply a radial load that can be adjusted in real time, thereby ensuring measurement accuracy. There is no mutual coupling between the components inside the test unit 5, and a single component can be replaced without affecting the use of other components, simplifying and optimizing the test process. At the same time, the test unit 5 is relatively independent as a whole, and can be replaced with cylindrical roller bearings, tapered roller bearings, double-row ball bearings, etc., without affecting the design of other systems. The test unit 5 can be flexibly replaced, simplifying the test process and expanding the applicability of the test bench.

[0067] The working principle of the aforementioned test bench is as follows: Before the test begins, a test cage 504 with the same shape and material as the cage of the bearing under test is fabricated, and a test rolling element 502 is placed in the test cage 504. By adjusting the loading threaded rod 303 to stretch the loading spring 305, the limiting post 205 is just not in contact with the base 1, and the measurement value of the tension sensor 304 at this time is recorded as zero. Then, the radial load to be applied to the test rolling element 502 is converted into a tension force applied to the rear positioning bracket 206 by using the lever theorem. This tension force is applied by adjusting the height of the loading threaded rod 303 again to stretch the loading spring 305, thereby pressing the test inner ring 501, the test rolling element 502, and the test outer ring 503 together. During the test, the drive motor 602 drives the test outer ring 503 to rotate, and drags the test rolling element 502 to impact the test cage 504, and drives the test inner ring 501 to rotate, thus simulating the operating state of the bearing. The impact is transmitted to the locking structure 4061 via the fixed cantilever beam 5041, and then to the three-dimensional force sensor 405 via the cage connecting flange 406, where its magnitude and direction are recorded. After subsequent processing, the time-varying collision force between the tested rolling element 502 and the pocket of the tested cage 504 is obtained.

[0068] During the test, the load and speed can be dynamically changed. The above structure expands the test condition range of the tested bearing and better simulates real-world conditions. In addition, the drive bearing housing 601 does not completely contain the tested outer ring 503, which facilitates the observation of the collision between the tested rolling element 502 and the tested cage 504 during the test. Finally, each component in the test unit 5 can be replaced individually, making it suitable for all types of rolling bearings and mechanical systems with rolling bearing structures, making the test process more flexible and simplifying the optimization process.

[0069] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

[0070] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A test bench for measuring the impact force between a cage pocket and a rolling element, characterized in that, It includes a base (1), an inner ring support system (2), a loading system (3), a measuring system (4), and a drive system (6); The inner ring support system, the loading system, the measuring system, and the driving system are all fixedly installed on the base; The inner ring support system is used to support the inner ring of the unit under test; The loading system is connected to the inner ring support system and is used to apply a load to the inner ring under test through the inner ring support system. The drive system is used to fix the outer ring of the unit under test in place and drive the outer ring of the unit under test to rotate. The measurement system is used to be fixedly connected to the test cage of the unit under test, and to measure the magnitude and direction of the impact force of the test rolling element of the unit under test colliding with the test cage.

2. The test bench as described in claim 1, characterized in that, The inner ring support system includes a support bearing housing, a support bearing, a support shaft, a support plate, a limiting post, a rear positioning bracket, a front positioning bracket, a front locking nut, an inner ring support shaft, and an inner ring follower bearing. The two support bearing seats are fixedly mounted on the top surface of the base relative to each other; Each of the support bearing housings is equipped with one of the support bearings. The support shaft is arranged in a horizontal direction and its two ends are rotatably mounted on the two support bearings. The bottom surface of one end of the support plate is supported on the support bearing, and the top of the other end is fixedly connected to the rear positioning bracket and the front positioning bracket, and the middle part is fixedly connected to the limiting post; the rear positioning bracket is located between the front positioning bracket and the limiting post. The limiting post is located between the support plate and the base, and the height of the limiting post is slightly less than the distance between the vertex of the support shaft and the top surface of the base; The inner ring support shaft is fixedly connected to the rear positioning bracket and the front positioning bracket, and can rotate with the support plate; the front end of the inner ring support shaft and the front locking nut together clamp the inner ring follower bearing, thereby installing the inner ring to be tested on the inner ring support shaft.

3. The test bench as described in claim 2, characterized in that, The inner ring support system also includes a rear locking nut that is threadedly connected to the inner ring support shaft. The rear locking nut and the inner ring support shaft clamp the rear positioning bracket in the middle, thereby restricting the circumferential rotation and axial movement of the inner ring support shaft. Both the rear positioning bracket and the front positioning bracket are fixedly connected to the support plate by bolts and supporting connecting angle irons; The limiting post is fixedly connected to the support plate by bolts.

4. The test bench as described in claim 2, characterized in that, The loading system includes a loading support rod, a loading crossbeam, a loading threaded rod, a tension sensor, a loading spring, and loading bolts; The two loading support rods are arranged vertically and symmetrically distributed on both sides of the support plate. The bottom end is fixedly installed on the base, and the top end is fixedly connected to the loading crossbeam. The loading threaded rod, the tension sensor, the loading spring, and the loading bolt are connected in sequence from top to bottom in the vertical direction; The loading threaded rod is helically engaged with the loading crossbeam, and its up-and-down movement is controlled by rotating the loading threaded rod; The bottom end of the loading bolt is threaded to the top end of the rear positioning bracket.

5. The test bench as described in claim 4, characterized in that, Both the top of the loading beam and the rear positioning bracket are provided with threaded holes. The loading threaded rod is helically engaged with the threaded hole of the loading crossbeam; The loading bolt is threadedly connected to the threaded hole at the top of the rear positioning bracket.

6. The test bench as described in claim 4, characterized in that, The measurement system includes a measurement support rod, a measurement support beam, and a three-dimensional force sensor; The two measuring support rods are arranged vertically and symmetrically distributed on both sides of the support plate. The bottom end is fixedly installed on the base, and the top end is fixedly connected to the measuring support beam. The three-dimensional force sensor is fixedly installed at the front end of the measuring support beam; The three-dimensional force sensor is used for fixed connection with the cage being tested.

7. The test bench as described in claim 6, characterized in that, The measurement system also includes a measuring connection angle iron, a sensor connector, and a cage connection flange; The sensor connector is fixed to the front end of the measuring support beam by the measuring connecting angle iron and bolts; The three-dimensional force sensor is fixedly connected between the sensor connector and the cage connecting flange.

8. The test bench as described in claim 7, characterized in that, The cage connecting flange has a locking structure; The cage under test has a fixed cantilever beam; The locking structure is used to clamp the fixed cantilever beam and is fixed by bolts and nuts.

9. The test bench as described in claim 7, characterized in that, The drive system includes a drive bearing housing, a drive motor, and a motor bracket; The motor bracket is fixedly installed on the base; The drive motor is fixedly mounted on the motor bracket and is used to drive the drive bearing seat to rotate; The drive bearing housing is used to fix the outer ring being measured, and the axial length of the drive bearing housing is less than the axial length of the outer ring being measured.

10. The test bench as described in any one of claims 1-9, characterized in that, The outer ring under test is installed in the drive bearing housing with an interference fit.

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