A gearbox bearing performance testing device and testing method

Abstract

This invention discloses a gearbox bearing performance testing device and method, belonging to the field of bearing performance testing technology. Through a set testing mechanism, a power source drives an eccentric shaft to rotate. Under the action of friction, the outer ring of the bearing, which abuts against the eccentric shaft, rotates synchronously with the eccentric shaft. When the eccentric end of the eccentric shaft abuts against the outer ring of the bearing, the bearing drives a slider to slide within a cage. The slider drives a lifting rod to move under the constraint of a guide rod and a lifting chamber, compressing a spring. The spring undergoes elastic deformation, and the bearing position shifts. As the eccentric shaft and the outer ring of the bearing continue to rotate, when the eccentric end of the eccentric shaft no longer abuts against the bearing, the spring's elastic deformation recovers, pushing the lifting rod and slider back to their original positions. The testing chamber drives the bearing to move in the opposite direction, enabling the bearing to perform periodic radial displacement while rotating at high speed. This allows the axial displacement amplitude, frequency, and vibration and noise levels of the bearing under axial displacement conditions to be tested.

Description

Technical Field

[0001] This invention relates to the field of bearing performance testing technology, and in particular to a gearbox bearing performance testing device and testing method. Background Technology

[0002] As a core component of the automotive transmission system, the performance of gearbox bearings directly affects the vehicle's power transmission efficiency, shifting smoothness, and service life. Gearbox bearing performance testing needs to cover core indicators such as dynamic load, rotational accuracy, friction torque, and durability. Methods such as vibration and noise analysis, temperature field testing, and material performance testing are used to improve the reliability and transmission efficiency of the gearbox.

[0003] In transmission systems requiring axial adjustment, such as gearboxes and clutches, the dynamic performance, axial clearance, and fatigue life of bearings directly affect the reliability, accuracy, and lifespan of the system. To evaluate the dynamic response of bearings during axial adjustment, the test items include the sensitivity, hysteresis, and stability of axial displacement.

[0004] Existing testing methods simulate actual operating conditions at speeds (such as thousands of revolutions per minute) by applying periodic radial force through a servo motor or hydraulic device, measuring the axial displacement amplitude, frequency, and stability of the bearing. Simultaneously, when the bearing is displaced under periodic radial force, the vibration and noise levels of the bearing in the moving state are evaluated to assess dynamic stability.

[0005] However, in actual operation, the hydraulic system is limited by the oil pressure response speed and the compressibility of the oil has a lag (response time ≥10ms). The servo motor requires a complex algorithm to achieve frequency adjustment, and may lose steps under high load. In addition, the cost and complexity of using servo motors or hydraulic systems are significantly increased, which cannot meet the requirements of strong frequency and amplitude adjustability, fast dynamic response and no lag, and it is difficult to simulate the real working conditions of rotating machinery. Summary of the Invention

[0006] The purpose of this invention is to address the limitations of hydraulic systems in terms of oil pressure response speed, the lag in oil compressibility (response time ≥ 10ms), the need for complex algorithms to regulate the frequency of servo motors, the potential for step loss under high loads, and the significant increase in cost and complexity of using servo motors or hydraulic systems. These issues make it difficult to meet the requirements of high frequency and amplitude adjustability, fast dynamic response, and no lag, and to simulate the real working conditions of rotating machinery. Therefore, this invention proposes a gearbox bearing performance testing device and method.

[0007] To achieve the above objectives, the present invention employs the following technology: a gearbox bearing performance testing device.

[0008] The test equipment includes a base, a mounting platform and a power source mounted on the base. A test mechanism is also mounted on the base. The test mechanism includes a movable shaft connected to the output end of the power source. An eccentric shaft with an axis that does not coincide with the center line of the movable shaft is mounted on the movable shaft. When the eccentric shaft rotates, it generates a periodic radial force.

[0009] Additionally, two cages are installed on the mounting platform, and a liftable test chamber is provided between the two cages via a telescopic rod. A bearing that abuts against the eccentric shaft is installed in the test chamber. The outer ring of the bearing rotates synchronously with the eccentric shaft, and the eccentric shaft pushes the bearing to make periodic radial displacement.

[0010] Further description of a gearbox bearing performance testing device as described above:

[0011] The telescopic rod includes at least one lifting cavity disposed within the retainer, a guide rod rotatably disposed within the lifting cavity, and a lifting rod movably sleeved on the surface of the guide rod, extending through the top of the lifting cavity, and a spring disposed inside the lifting rod, the end of which abuts against the guide rod;

[0012] The test chamber has sliders on both sides that are slidably embedded in the cage and connected to the lifting rod.

[0013] Further description of a gearbox bearing performance testing device as described above:

[0014] The test chamber is provided with a positioning shaft in the middle that matches the inner diameter of the bearing inner ring. A fixing frame that abuts against the bearing inner ring is sleeved on the positioning shaft, and an abutting part that abuts against the fixing frame is fitted at the end of the positioning shaft.

[0015] Further description of a gearbox bearing performance testing device as described above:

[0016] The testing mechanism also includes two mounting bases installed on the base, each mounting base having a fixed shaft rotatably installed inside the two mounting bases, and any one of the fixed shafts being connected to the output end of the power source.

[0017] The movable shaft is rotatably connected to two fixed shafts at both ends and is detachably connected to two fixed shafts, respectively. The eccentric shaft is slidably nested on the movable shaft, which is separate from the fixed shaft.

[0018] Further description of a gearbox bearing performance testing device as described above:

[0019] The mounting platform is connected to the retainer via a switching mechanism. The switching mechanism includes a rotating cavity on the mounting platform and a mounting frame disposed in the rotating cavity. A turntable is rotatably mounted on the mounting frame. The turntable has a groove that matches the sliding trajectory of the test cavity. Mounting cavities for mounting the retainer are formed on both sides of the groove.

[0020] The mounting bracket is provided with a first slide rail, on which a test chamber cover that engages with the test chamber is slidably embedded. A positioning pin is provided in the middle of the test chamber cover, and the positioning pin passes through the positioning shaft and the abutment to lock the turntable.

[0021] Further description of a gearbox bearing performance testing device as described above:

[0022] The test chamber cover is provided with a second slide rail, and the end of the positioning pin is provided with a slide table that is slidably embedded in the second slide rail.

[0023] Further description of a gearbox bearing performance testing device as described above:

[0024] The cage is equipped with a locking mechanism for locking the lifting rod. The locking mechanism includes a limiting block on the inner wall of the lifting rod and an annular groove and a lifting groove on the guide rod. The limiting block is slidably embedded in the annular groove and the lifting groove. When the lifting groove rotates to the position corresponding to the limiting block, the lifting rod can extend or retract.

[0025] Further description of a gearbox bearing performance testing device as described above:

[0026] The locking mechanism also includes a communicating cavity disposed within the retainer, and a rotating component rotatably disposed on the communicating cavity and connected to the guide rod;

[0027] The rotating component is driven to rotate by a rod that passes through the turntable and the cage and is inserted into the communicating cavity. The surface of the rod is provided with a guide groove, and the rotating component is provided with a guide pin that is embedded in the guide groove. When the rod is inserted, the guide groove guides the rotating component to rotate.

[0028] Further description of a gearbox bearing performance testing device as described above:

[0029] The guide groove includes an unlocking groove and a locking groove, which are connected by a transition groove. When the guide pin slides in the transition groove, the rotating component rotates.

[0030] A method for testing the performance of a gearbox bearing includes the following steps:

[0031] S1. Following the installation sequence, install the fixing bracket, bearing, and another fixing bracket onto the positioning shaft in sequence. Engage the abutment piece onto the positioning shaft and tighten it with threads. The abutment piece abuts against the fixing bracket and fixes the inner ring of the bearing, thus completing the bearing installation.

[0032] S2. When it is necessary to replace the eccentric shaft, remove one end of the movable shaft from the fixed shaft, and deflect it with the fixed shaft that is rotatably connected as the axis. Slide the eccentric shaft into the movable shaft and fix the movable shaft again.

[0033] S3. When it is necessary to test the dynamic performance and axial clearance of the bearing, rotate the turntable so that multiple test chambers rotate to the top in sequence and install the bearings. After all the bearings are installed, the bearings in the test chambers at the bottom of the turntable abut against the eccentric shaft and are ready to start the test.

[0034] S4. Push the test chamber cover so that the test chamber cover, guided by the first slide rail, drives the positioning pin to insert into the positioning shaft. At the same time, the test chamber cover drives the insertion rod to pass through the turntable and the cage in sequence and insert into the connecting cavity. During the insertion of the insertion rod, the guide pin guides the rotating part through the guide groove to drive the guide rod to rotate, so that the lifting groove rotates to the position corresponding to the limit block, thereby releasing the restriction on the telescopic rod.

[0035] S5. Start the power source to drive the eccentric shaft to rotate. Under the action of friction, the outer ring of the bearing that abuts against the eccentric shaft rotates synchronously with the eccentric shaft. While rotating at high speed, the bearing performs periodic radial displacement. Test the axial displacement amplitude, frequency, vibration and noise level of the bearing under axial displacement conditions.

[0036] S6: After the test is completed, pull the handle to remove the test chamber cover. The test chamber cover moves the positioning pin out of the positioning shaft. At the same time, the guide pin rotates in the opposite direction through the insert rod. The guide pin drives the guide rod to rotate in the opposite direction through the rotating part. The telescopic rod is locked again, the turntable restriction is released, and the turntable is rotated to replace the next bearing to be tested.

[0037] In summary, due to the adoption of the above-mentioned technology in the gearbox bearing performance testing equipment and method, the beneficial effects of this invention are:

[0038] 1. Through the set testing mechanism, the power source drives the eccentric shaft to rotate. Under the action of friction, the outer ring of the bearing that abuts against the eccentric shaft rotates synchronously with the eccentric shaft. When the eccentric end of the eccentric shaft abuts against the outer ring of the bearing, the bearing drives the slider to slide in the cage. The slider drives the lifting rod to move under the restriction of the guide rod and the lifting cavity and squeezes the spring. The spring undergoes elastic deformation, and the position of the bearing moves. As the eccentric shaft and the outer ring of the bearing continue to rotate, when the eccentric end of the eccentric shaft no longer abuts against the bearing, the elastic deformation of the spring recovers and pushes the lifting rod and the slider to reset. The testing cavity drives the bearing to move in the opposite direction, so that the bearing can perform periodic radial displacement while rotating at high speed. This allows the axial displacement amplitude, frequency, and vibration and noise levels of the bearing under axial displacement conditions to be tested. Compared with servo motors or hydraulic drives, the periodic radial force applied by the eccentric axial bearing does not require a complex control system. The output of the eccentric shaft is synchronized with the speed of the power source, enabling high-frequency vibration without lag. At the same time, the vibration generated when the eccentric end of the eccentric shaft disengages from the outer ring of the bearing is closer to the actual vibration source.

[0039] 2. Through the switching mechanism, the turntable rotates under the constraint of the mounting frame. Multiple test chambers rotate to the top in sequence and install bearings. After all bearings are installed, the bearing in the test chamber at the bottom of the turntable abuts against the eccentric shaft and is ready to start testing. To facilitate the adjustment of the position of the test chamber cover, a handle is installed on the test chamber cover. Pushing the test chamber cover causes it to move the positioning pin into the positioning shaft under the guidance of the first slide rail. The position of the test chamber is locked, preventing the turntable from rotating and adjusting around the mounting frame. The position of the turntable is fixed to improve the stability when testing the bearing. After the bearing test is completed, the test chamber cover is pulled out by pulling the handle. At the same time, the test chamber cover moves the positioning pin out of the positioning shaft, and the restriction of the turntable is released. The next bearing to be tested is replaced by rotating the turntable. Attached Figure Description

[0040] Figure 1 A three-dimensional structural schematic diagram of a gearbox bearing performance testing device is shown;

[0041] Figure 2 A three-dimensional structural schematic diagram of the eccentric shaft is shown;

[0042] Figure 3 A three-dimensional structural diagram of the eccentric shaft installation is shown.

[0043] Figure 4 A front view cross-sectional structural schematic diagram of a gearbox bearing performance testing device is shown;

[0044] Figure 5 A three-dimensional structural diagram of the cage, telescopic rod, and test chamber is shown;

[0045] Figure 6 A three-dimensional cross-sectional structural diagram of the test chamber and positioning pin is shown;

[0046] Figure 7 A three-dimensional structural diagram of the test chamber is shown;

[0047] Figure 8 A three-dimensional cross-sectional structural diagram of the slide and telescopic rod is shown;

[0048] Figure 9 A three-dimensional cross-sectional structural diagram of the switching mechanism is shown;

[0049] Figure 10 A partial three-dimensional structural diagram of the locking mechanism when locked is shown;

[0050] Figure 11 A three-dimensional structural diagram of the test chamber and its cover in the closed state is shown.

[0051] Figure 12 It shows Figure 11 Enlarged structural diagram at point A;

[0052] Figure 13 A three-dimensional structural diagram of the test chamber cover sliding on the first slide rail is shown;

[0053] Figure 14 A partial three-dimensional cross-sectional structural diagram of the telescopic rod and locking mechanism is shown;

[0054] Figure 15 A partial three-dimensional structural schematic diagram of the lifting rod and the limiting block is shown;

[0055] Figure 16 A partial three-dimensional cross-sectional view of the guide pin rotating under the guidance of the guide groove is shown.

[0056] Figure 17 A partial three-dimensional structural schematic diagram of the insert rod and guide groove is shown.

[0057] Legend:

[0058] 10. Test equipment body; 11. Base; 12. Mounting platform; 13. Power source;

[0059] 20. Testing mechanism; 21. Mounting base; 22. Fixed shaft; 23. Movable shaft; 24. Eccentric shaft; 25. Cage; 26. Telescopic rod; 261. Lifting chamber; 262. Guide rod; 263. Lifting rod; 264. Spring; 27. Testing chamber; 271. Slider; 272. Positioning shaft; 273. Fixed frame; 274. Abutment component;

[0060] 30. Switching mechanism; 31. Rotating cavity; 32. Mounting bracket; 33. Turntable; 34. Mounting cavity; 35. First slide rail; 36. Test chamber cover; 361. Handle; 37. Positioning pin; 371. Slide table; 372. Second slide rail;

[0061] 40. Locking mechanism; 41. Limiting block; 42. Annular groove; 43. Lifting groove; 44. Connecting cavity; 45. Rotating component; 46. Guide pin; 47. Insert rod; 48. Guide groove; 481. Unlocking groove; 482. Locking groove; 483. Transition groove. Detailed Implementation

[0062] The following will describe clearly and completely the technical specifications of a gearbox bearing performance testing device and testing method according to the embodiments of the present invention, with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0063] To address the limitations of hydraulic systems due to oil pressure response speed and the resulting lag in oil compressibility (response time ≥ 10ms), and the need for complex algorithms to regulate frequency in servo motors, which may lead to step loss under high loads, and the significant increase in cost and complexity of using either servo motors or hydraulic systems, this invention proposes a gearbox bearing performance testing device. Figure 1 - Figure 17 As shown:

[0064] The test equipment includes a test equipment body 10, which includes a base 11, a mounting platform 12 and a power source 13 mounted on the base 11, and a test mechanism 20 mounted on the base 11. The test mechanism 20 includes a movable shaft 23 connected to the output end of the power source 13. An eccentric shaft 24 with an axis that does not coincide with the center line of the movable shaft 23 is mounted on the movable shaft 23. When the eccentric shaft 24 rotates, it generates a periodic radial force.

[0065] Additionally, two retainers 25 are mounted on the mounting platform 12, and a liftable test chamber 27 is provided between the two retainers 25 via a telescopic rod 26, such as... Figure 8 As shown, the telescopic rod 26 includes two lifting chambers 261 disposed in the retainer 25. A guide rod 262 is rotatably disposed in the lifting chamber 261, and a lifting rod 263 that passes through the top of the lifting chamber 261 is movably sleeved on the surface of the guide rod 262. A spring 264 with its end abutting against the guide rod 262 is disposed inside the lifting rod 263.

[0066] The test chamber 27 has sliders 271 that are slidably embedded in the retainer 25 and connected to the lifting rod 263 on both sides. The test chamber 27 is equipped with a bearing that abuts against the eccentric shaft 24. The test chamber 27 has a positioning shaft 272 that matches the inner diameter of the bearing inner ring in the middle. The positioning shaft 272 is fitted with a fixing bracket 273 that abuts against the bearing inner ring. The end of the positioning shaft 272 is fitted with an abutting member 274 that abuts against the fixing bracket 273. When the bearing needs to be installed, the fixing bracket 273, the bearing and another fixing bracket 273 are fitted onto the positioning shaft 272 in the order of installation. Then the abutting member 274 is fitted onto the positioning shaft 272 and tightened with threads. The abutting member 274 abuts against the fixing bracket 273 and fixes the bearing inner ring. The bearing installation is completed.

[0067] When it is necessary to test the dynamic performance and axial clearance of the bearing, the power source 13 is started, which drives the eccentric shaft 24 to rotate. Under the action of friction, the outer ring of the bearing that abuts against the eccentric shaft 24 rotates synchronously with the eccentric shaft 24. When the eccentric end of the eccentric shaft 24 abuts against the outer ring of the bearing, the bearing drives the slider 271 to slide in the cage 25. The slider 271 drives the lifting rod 263 to move under the restriction of the guide rod 262 and the lifting cavity 261 and squeeze the spring 264. The spring 264 undergoes elastic deformation, and the position of the bearing moves.

[0068] As the eccentric shaft 24 and the outer ring of the bearing continue to rotate, when the eccentric end of the eccentric shaft 24 no longer abuts against the bearing, the elastic deformation of the spring 264 is restored and pushes the lifting rod 263 and the slider 271 to reset. The test chamber 27 drives the bearing to move in the opposite direction, so that the bearing can perform periodic radial displacement while rotating at high speed, thereby testing the axial displacement amplitude, frequency, and vibration and noise levels of the bearing under axial displacement conditions.

[0069] Compared to servo motors or hydraulic drives, the eccentric shaft 24 applies a periodic radial force to the bearing without the need for a complex control system. The output of the eccentric shaft 24 is synchronized with the rotational speed of the power source 13, enabling high-frequency vibration without lag. At the same time, the vibration generated when the eccentric end of the eccentric shaft 24 separates from the outer ring of the bearing is closer to the actual vibration source.

[0070] like Figures 2-3 As shown, by replacing the eccentric shafts 24 with different eccentricities and counterweights, different amplitudes can be achieved. The testing mechanism 20 also includes two mounting seats 21 mounted on the base 11. Fixed shafts 22 are rotatably mounted in both mounting seats 21. Any one of the fixed shafts 22 is connected to the output end of the power source 13. The two ends of the movable shaft 23 are rotatably connected to the two fixed shafts 22 and detachably connected to them, respectively. When it is necessary to replace the eccentric shaft 24, one end of the movable shaft 23 is removed from the fixed shaft 22, and the fixed shaft 22 is used as the axis for deflection. Then, the eccentric shaft 24 is slidably nested on the movable shaft 23 and the movable shaft 23 is fixed again.

[0071] When the eccentric shaft 24 is used to overload the bearing, the bearing surface easily gets hot after high-speed rotation. To facilitate replacement of the eccentric shaft 24 under test and to achieve non-contact replacement, such as... Figure 9 As shown, the mounting platform 12 is connected to the retainer 25 through the switching mechanism 30. The switching mechanism 30 includes a rotating cavity 31 opened on the mounting platform 12 and a mounting frame 32 set in the rotating cavity 31. A turntable 33 is rotatably arranged on the mounting frame 32. A groove matching the sliding trajectory of the test cavity 27 is opened on the turntable 33. The depth of the groove is the maximum moving distance of 27. Mounting cavities 34 for mounting the retainer 25 are opened on both sides of the groove.

[0072] The mounting bracket 32 ​​is provided with a first slide rail 35, and a test chamber cover 36 that engages with the test chamber 27 is slidably embedded on the first slide rail 35. A positioning pin 37 is provided in the middle of the test chamber cover 36. The positioning pin 37 passes through the positioning shaft 272 and the abutment 274 and locks the turntable 33.

[0073] Before testing, the turntable 33 is rotated under the constraint of the mounting frame 32. Multiple test chambers 27 are rotated to the top in sequence and bearings are installed. After all bearings are installed, the bearing in the test chamber 27 at the bottom of the turntable 33 abuts against the eccentric shaft 24 and is ready to start testing. To facilitate the adjustment of the position of the test chamber cover 36, a handle 361 is installed on the test chamber cover 36. At this time, the test chamber cover 36 is pushed, and the test chamber cover 36, guided by the first slide rail 35, drives the positioning pin 37 to insert into the positioning shaft 272. The position of the test chamber 27 is locked, so that the turntable 33 can no longer be rotated and adjusted with the mounting frame 32 as the axis. The position of the turntable 33 is fixed to improve the stability when testing the bearing.

[0074] It is important to note that, such as Figure 11 and Figure 12 As shown, a second slide rail 372 is provided on the test chamber cover 36, and a slide table 371 is provided at the end of the positioning pin 37 and slidably embedded in the second slide rail 372. When the positioning pin 37 is inserted into the positioning shaft 272, the positioning shaft 272 can drive the positioning pin 37 to slide under the restriction of the second slide rail 372 during the test, so as to adapt to the position change generated by the bearing when it makes periodic radial displacement.

[0075] like Figure 8 , Figures 13-15 As shown, in order to ensure that the telescopic rod 26 can extend and retract only after the bearing abuts against the eccentric shaft 24, a locking mechanism 40 for locking the lifting rod 263 is provided in the retainer 25. The locking mechanism 40 includes a limiting block 41 provided on the inner wall of the lifting rod 263 and an annular groove 42 and a lifting groove 43 provided on the guide rod 262. The limiting block 41 is slidably embedded in the annular groove 42 and the lifting groove 43. When the lifting groove 43 rotates to the position corresponding to the limiting block 41, the lifting rod 263 can extend and retract.

[0076] When the bearing has not yet come into contact with the eccentric shaft 24, the limiting block 41 is located in the annular groove 42. At this time, the limiting block 41, together with the annular groove 42, restricts the position of the lifting rod 263, and the lifting rod 263 cannot retract and compress the spring 264. When the bearing comes into contact with the eccentric shaft 24 and it is necessary to release the restriction on the lifting rod 263, the guide rod 262 is rotated to drive the annular groove 42 and the lifting groove 43 to rotate. When the lifting groove 43 rotates to the position corresponding to the limiting block 41, the restriction on the lifting rod 263 is released. At this time, the lifting rod 263 can drive the limiting block 41 to slide in the lifting groove 43 to achieve the purpose of compressing the spring 264.

[0077] Furthermore, in order to control the rotation of the guide rod 262, such as Figure 16 and Figure 17 As shown, the locking mechanism 40 also includes a communicating cavity 44 disposed within the retainer 25. A rotating component 45, rotatably connected to the guide rod 262, is rotatably disposed on the communicating cavity 44. By pushing the test chamber cover 36, the test chamber cover 36 causes the insertion rod 47 to sequentially pass through the turntable 33 and the retainer 25 and be inserted into the communicating cavity 44. A guide groove 48 is formed on the surface of the insertion rod 47, and a guide pin 46 embedded in the guide groove 48 is disposed on the rotating component 45. The guide groove 48 includes an unlocking groove 481 and a locking groove 482, which are connected by a transition groove 483. During the insertion of the insertion rod 47 into the communicating cavity 44, the guide pin 46 passes through the opening of the locking groove 482. The insertion rod 47 is inserted into the socket and, guided by the locking groove 482, reaches the transition groove 483. As the insertion rod 47 continues to be inserted, the guide pin 46 rotates around the rotating part 45 under the guidance of the transition groove 483. This allows the rotating part 45 to drive the guide rod 262, the annular groove 42, and the lifting groove 43 to rotate. When the guide pin 46 moves out of the transition groove 483 and into the unlocking groove 481, the guide rod 262 drives the lifting groove 43 to rotate to the position corresponding to the limit block 41. The restriction of the telescopic rod 26 is released. At this time, the test chamber 27 and the test chamber cover 36 are fully abutted. The eccentric shaft 24 can push the bearing to move reciprocally in the radial direction to test the dynamic performance and axial clearance of the bearing.

[0078] After the bearing test is completed, the test chamber cover 36 is pulled out by pulling the handle 361. At the same time, the test chamber cover 36 moves the positioning pin 37 out of the positioning shaft 272. Simultaneously, the test chamber cover 36 drives the guide groove 48 to rotate the guide pin 46 in the opposite direction through the insertion rod 47. The guide pin 46 drives the guide rod 262 to reverse through the rotating part 45. The telescopic rod 26 is locked again. At the same time, the restriction of the turntable 33 is released. The next bearing to be tested can be replaced by rotating the turntable 33.

[0079] As another implementation of this application, such as Figure 10 As shown, when the test chamber cover 36 drives the positioning pin 37 to insert into the positioning shaft 272 and the insertion rod 47 is not inserted into the connecting cavity 44, the test chamber 27 and the test chamber cover 36 are not fully in contact, and the restriction of the telescopic rod 26 is not released and a preload is applied. At the same time, the positions of the test chamber 27 and the bearing are fixed and in contact with the eccentric shaft 24. By starting the power source 13 to drive the eccentric shaft 24 to rotate, the eccentric shaft 24 applies a periodic radial force to the bearing. Since the test chamber 27 and the bearing cannot move, the radial force acts entirely on the outer ring and balls of the bearing, thereby achieving the purpose of measuring the axial stiffness of the bearing and observing whether the bearing undergoes plastic deformation or failure under the action of radial force, so as to evaluate the performance of the bearing under different working conditions and ensure that it meets the design requirements and application scenario needs.

[0080] This application also provides a method for testing the performance of a gearbox bearing, including the following steps:

[0081] S1. Following the installation sequence, install the fixing bracket 273, the bearing, and another fixing bracket 273 onto the positioning shaft 272. Engage the abutment 274 onto the positioning shaft 272 and tighten it with threads. The abutment 274 abuts against the fixing bracket 273 and fixes the inner ring of the bearing, thus completing the bearing installation.

[0082] S2. When it is necessary to replace the eccentric shaft 24, remove one end of the movable shaft 23 from the fixed shaft 22, and deflect it with the fixed shaft 22 as the axis of rotation, so that the eccentric shaft 24 is slidably nested on the movable shaft 23 and the movable shaft 23 is fixed again.

[0083] S3a. When it is necessary to test the dynamic performance and axial clearance of the bearing, rotate the turntable 33 so that multiple test chambers 27 are rotated to the top in sequence and the bearings are installed. After all the bearings are installed, the bearings in the test chambers 27 located at the bottom of the turntable 33 abut against the eccentric shaft 24 and are ready to start the test.

[0084] S4a. Push the test chamber cover 36, so that the test chamber cover 36, guided by the first slide rail 35, drives the positioning pin 37 to insert into the positioning shaft 272. At the same time, the test chamber cover 36 drives the insertion rod 47 to pass through the turntable 33 and the retainer 25 in sequence and insert into the connecting cavity 44. During the insertion of the insertion rod 47, the guide pin 46 guides the rotating part 45 through the guide groove 48 to drive the guide rod 262 to rotate, so that the lifting groove 43 rotates to the position corresponding to the limit block 41, thereby releasing the restriction on the telescopic rod 26.

[0085] S5a. Start the power source 13 to drive the eccentric shaft 24 to rotate. Under the action of friction, the outer ring of the bearing that abuts against the eccentric shaft 24 rotates synchronously with the eccentric shaft 24. While rotating at high speed, the bearing performs periodic radial displacement. The axial displacement amplitude, frequency, vibration and noise levels of the bearing under axial displacement conditions are tested.

[0086] S3b: When it is necessary to measure the axial stiffness of the bearing, push the test chamber cover 36 to drive the positioning pin 37 to be inserted into the positioning shaft 272 and the insertion rod 47 is not inserted into the connecting cavity 44. At this time, the test chamber 27 and the test chamber cover 36 are not fully in contact, the telescopic rod 26 is not released and a pre-tightening force is applied, the test chamber 27 and the bearing position are fixed and abut against the eccentric shaft 24.

[0087] S4b: Start the power source 13 to drive the eccentric shaft 24 to rotate, so that the eccentric shaft 24 applies a periodic radial force to the bearing. Since the test chamber 27 and the bearing cannot move, the radial force is fully applied to the outer ring and balls of the bearing. Measure the axial stiffness of the bearing and observe whether the bearing undergoes plastic deformation or failure under the action of radial force.

[0088] S6: After the test is completed, pull the handle 361 to remove the test chamber cover 36. The test chamber cover 36 drives the positioning pin 37 to move out of the positioning shaft 272. At the same time, the guide pin 46 is rotated in the opposite direction by the insertion rod 47 driving the guide groove 48. The guide pin 46 drives the guide rod 262 to reverse through the rotating part 45. The telescopic rod 26 is locked again, the turntable 33 is released from restriction, and the turntable 33 is rotated to replace the next bearing to be tested.

[0089] 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 technology of the gearbox bearing performance testing equipment and testing method and the inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gearbox bearing performance testing device, comprising a testing device body (10), the testing device body (10) including a base (11), a mounting platform (12) mounted on the base (11), and a power source (13), characterized in that, The base (11) is also equipped with a test mechanism (20), which includes a movable shaft (23) connected to the output end of the power source (13). An eccentric shaft (24) whose axis does not coincide with the center line of the movable shaft (23) is installed on the movable shaft (23). When the eccentric shaft (24) rotates, it generates a periodic radial force. In addition, two retainers (25) are installed on the mounting platform (12), and a liftable test chamber (27) is provided between the two retainers (25) through a telescopic rod (26). A bearing that abuts against the eccentric shaft (24) is installed in the test chamber (27). The outer ring of the bearing rotates synchronously with the eccentric shaft (24), and the eccentric shaft (24) pushes the bearing to make periodic radial displacement. The telescopic rod (26) includes at least one lifting cavity (261) disposed in the retainer (25). A guide rod (262) is rotatably disposed in the lifting cavity (261), and a lifting rod (263) that penetrates the top of the lifting cavity (261) is movably sleeved on the surface of the guide rod (262). A spring (264) with its end abutting against the guide rod (262) is disposed inside the lifting rod (263). The retainer (25) is provided with a locking mechanism (40) for locking the lifting rod (263). The locking mechanism (40) includes a limiting block (41) provided on the inner wall of the lifting rod (263) and an annular groove (42) and a lifting groove (43) opened on the guide rod (262). The limiting block (41) is slidably embedded in the annular groove (42) and the lifting groove (43). When the lifting groove (43) rotates to the position corresponding to the limiting block (41), the lifting rod (263) can extend and retract. The locking mechanism (40) further includes a connecting cavity (44) disposed in the retainer (25). A rotating component (45) connected to the guide rod (262) is rotatably disposed on the connecting cavity (44). The rotating component (45) is driven to rotate by a rod (47) that passes through the turntable (33) and the retainer (25) in sequence and is inserted into the connecting cavity (44). A guide groove (48) is provided on the surface of the rod (47). A guide pin (46) is provided on the rotating component (45) and embedded in the guide groove (48). When the rod (47) is inserted, the guide groove (48) guides the rotating component (45) to rotate.

2. The gearbox bearing performance testing equipment according to claim 1, characterized in that, The test chamber (27) has sliders (271) on both sides that are slidably embedded in the retainer (25) and connected to the lifting rod (263).

3. The gearbox bearing performance testing equipment according to claim 1, characterized in that, The test chamber (27) is provided with a positioning shaft (272) that matches the inner diameter of the bearing inner ring. A fixing frame (273) that abuts against the bearing inner ring is sleeved on the positioning shaft (272). An abutting part (274) that abuts against the fixing frame (273) is sleeved at the end of the positioning shaft (272).

4. A gearbox bearing performance testing device according to any one of claims 1-3, characterized in that, The testing mechanism (20) also includes two mounting seats (21) mounted on the base (11), and a fixed shaft (22) is rotatably mounted in each of the two mounting seats (21). Any one of the fixed shafts (22) is connected to the output end of the power source (13). The two ends of the movable shaft (23) are rotatably connected to the two fixed shafts (22) and detachably connected, respectively. The eccentric shaft (24) is slidably nested on the movable shaft (23) which is separated from the fixed shaft (22).

5. The gearbox bearing performance testing equipment according to claim 1, characterized in that, The mounting platform (12) is connected to the retainer (25) via a switching mechanism (30). The switching mechanism (30) includes a rotating cavity (31) opened on the mounting platform (12) and a mounting frame (32) set in the rotating cavity (31). A turntable (33) is rotatably arranged on the mounting frame (32). A groove matching the sliding trajectory of the test cavity (27) is opened on the turntable (33). Mounting cavities (34) for mounting the retainer (25) are opened on both sides of the groove. The mounting bracket (32) is provided with a first slide rail (35), and a test chamber cover (36) that engages with the test chamber (27) is slidably embedded on the first slide rail (35). A positioning pin (37) is provided in the middle of the test chamber cover (36). The positioning pin (37) passes through the positioning shaft (272) and the abutment (274) and locks the turntable (33).

6. The gearbox bearing performance testing equipment according to claim 5, characterized in that, The test chamber cover (36) is provided with a second slide rail (372), and the end of the positioning pin (37) is provided with a slide table (371) that is slidably embedded in the second slide rail (372).

7. The gearbox bearing performance testing equipment according to claim 1, characterized in that, The guide groove (48) includes an unlocking groove (481) and a locking groove (482). The unlocking groove (481) and the locking groove (482) are connected by a transition groove (483). When the guide pin (46) slides in the transition groove (483), the rotating part (45) rotates.

8. A method for testing the performance of a gearbox bearing, characterized in that, Includes the following steps: S1. In the order of installation, the fixing bracket (273), the bearing and another fixing bracket (273) are put on the positioning shaft (272). The abutment (274) is engaged and put on the positioning shaft (272) and tightened with threads. The abutment (274) abuts against the fixing bracket (273) and fixes the inner ring of the bearing, thus completing the bearing installation. S2. When it is necessary to replace the eccentric shaft (24), remove one end of the movable shaft (23) from the fixed shaft (22), and deflect it with the fixed shaft (22) as the axis of rotation, slide the eccentric shaft (24) onto the movable shaft (23) and fix the movable shaft (23) again. S3. When it is necessary to test the dynamic performance and axial clearance of the bearing, rotate the turntable (33) so that multiple test chambers (27) are rotated to the top in sequence and the bearings are installed. After all the bearings are installed, the bearings in the test chambers (27) at the bottom of the turntable (33) abut against the eccentric shaft (24) and are ready to start the test. S4. Push the test chamber cover (36) so that the test chamber cover (36) drives the positioning pin (37) to insert into the positioning shaft (272) under the guidance of the first slide rail (35). At the same time, the test chamber cover (36) drives the insertion rod (47) to pass through the turntable (33) and the cage (25) in sequence and insert into the connecting cavity (44). During the insertion of the insertion rod (47), the guide pin (46) guides the rotating part (45) through the guide groove (48) to drive the guide rod (262) to rotate, so that the lifting groove (43) rotates to the position corresponding to the limit block (41) and releases the restriction on the telescopic rod (26). S5. Start the power source (13) to drive the eccentric shaft (24) to rotate. Under the action of friction, the outer ring of the bearing that abuts against the eccentric shaft (24) rotates synchronously with the eccentric shaft (24). The bearing rotates at high speed and performs periodic radial displacement. The axial displacement amplitude, frequency and vibration and noise levels of the bearing under axial displacement conditions are tested. S6: After the test is completed, pull the handle (361) to remove the test chamber cover (36). The test chamber cover (36) drives the positioning pin (37) to move out of the positioning shaft (272). At the same time, the guide pin (46) is rotated in the opposite direction by the insert rod (47) and the guide groove (48). The guide pin (46) drives the guide rod (262) to reverse through the rotating part (45). The telescopic rod (26) is locked again, the turntable (33) is released from restriction, and the turntable (33) is rotated to replace the next bearing to be tested.

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