A kind of bearing life bench test device with pressure plate

Abstract

The application relates to the technical field of bearing test, and particularly discloses a bearing life bench test device with a pressure plate, which comprises a test shaft and a test bin, the test shaft extends into the test bin, further comprises a middle loading assembly installed in the middle part of the test shaft and a terminal bushing installed at the free end of the test shaft, the terminal bushing can be fixedly connected with the test bin, the terminal bushing is provided with a containing groove for containing a test pressure plate bearing, the pressure plate of the test pressure plate bearing can be fixedly connected with the terminal bushing and abuts the outer ring of the pressure plate bearing in the containing groove, and the middle loading assembly is used for loading radial load and eccentric axial load; further comprises a cylindrical roller bearing installed between the test shaft and the test bin, the cylindrical roller bearing is installed at one end of the test shaft close to a power input, and the inner ring and the outer ring of the cylindrical roller bearing can be separated in the axial direction. The scheme is used to solve the problem that there is a lack of life test of the pressure plate bearing bearing axial bending moment and radial force at present.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, and specifically to a bearing life test bench device with a pressure plate. Background Technology

[0002] Plate bearings are installed in the confined space of automotive transmission housings. Due to the thin wall of the housing where the plate bearing is installed, part of the bearing protrudes from the housing wall. To ensure the bearing can be installed in the housing, an annular step is machined on the outer ring of the bearing. This allows the plate to be installed on the step of the outer ring of the bearing using installation processes such as snap rings, riveting, and thermal deformation. In actual assembly, it is required that after the plate is installed, it can rotate freely relative to the outer ring. The bearing with the plate is inserted into the housing wall, and the plate is fixed to the housing wall with screws. The plate and the housing wall axially limit the outer ring of the bearing from both sides.

[0003] However, in automotive transmissions, the pressure plate bearing is mounted at the end of the main shaft, which typically houses helical gears. During transmission operation, the pressure plate shaft must withstand radial loads and axial forces offset from the center. If the outer ring of the pressure plate bearing is not strong enough, it can easily fracture at the step. Currently, standard deep groove ball bearing life testing machines apply axial force to the shaft center, which cannot verify the bending moment conditions of the pressure plate bearing, and therefore cannot evaluate the lifespan of newly developed pressure plate bearings. Summary of the Invention

[0004] The present invention aims to provide a test bench device for bearing life with pressure plate, so as to solve the problem of the lack of life test for pressure plate bearings subjected to axial bending moment and radial force.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A test bench apparatus for bearing life testing with a pressure plate includes a test shaft and a test chamber. The test shaft extends into the test chamber. The apparatus also includes an intermediate loading component installed in the middle of the test shaft and an end bushing installed at the free end of the test shaft. The end bushing can be fixedly connected to the test chamber. The end bushing is provided with a receiving groove for accommodating the pressure plate bearing under test. The pressure plate of the pressure plate bearing under test can be fixedly connected to the end bushing and press the outer ring of the pressure plate bearing against the receiving groove. The intermediate loading component is used to load radial load and eccentric axial load.

[0007] The principle and advantages of this scheme are as follows: After installing the middle load-bearing assembly, the test plate bearing, and the end load-bearing assembly on the test shaft, the installed test plate bearing is pressed against the receiving groove of the end bushing by the pressure plate. The end bushing is equivalent to the narrow housing wall of the pressure plate bearing in an automotive transmission, simulating the actual installation of the pressure plate bearing. After the above assembly is completed, the entire assembly including the end load-bearing assembly, the middle load-bearing assembly, and the test plate bearing is placed into the test chamber, and the end bushing is fixed inside the test chamber. The test chamber is equivalent to simulating the entire transmission housing, allowing the test plate bearing to work in a closed space, further making the life test of the test plate bearing closer to actual working conditions. During the formal test, an external motor drives the test shaft to rotate, simulating the actual operation of an automotive transmission. Through optimized design of the test device, this test device can completely simulate the actual installation and operating conditions of the pressure plate bearing, solving the problem of the lack of life testing for pressure plate bearings in existing technologies.

[0008] Preferably, as an improvement, it also includes a cylindrical roller bearing mounted on the test shaft, the cylindrical roller bearing being located at the end of the test shaft closer to the power input, the outer ring of the cylindrical roller bearing being mounted on the test chamber, and the inner and outer rings of the cylindrical roller bearing being axially separable.

[0009] Beneficial effects: When using this scheme, by installing a cylindrical roller bearing with separable inner and outer rings at the end of the test shaft near the power input, the damage to the cylindrical roller bearing caused by axial displacement due to axial force can be eliminated during the test of applying axial force. The axial push and pull force can be effectively applied to the pressure plate bearing, thereby improving the accuracy of the test.

[0010] Preferably, as an improvement, a first end bushing is installed between the cylindrical roller bearing and the test chamber. Both the first end bushing and the last end bushing are provided with the same oil passage. The oil passage of the first end bushing is used for splash lubrication of the cylindrical roller bearing, and the oil passage of the last end bushing is used for splash lubrication of the test pressure plate bearing.

[0011] Beneficial effects: By setting the head bushing and the end bushing, both the test pressure plate bearing and the accompanying cylindrical roller bearing can achieve splash lubrication. This not only makes the structure of the test device on the left and right sides of the test shaft more consistent, reducing the difficulty of installation and maintenance of the test device, but also makes splash lubrication closer to the actual working conditions of the pressure plate bearing, which is conducive to improving the accuracy of the test.

[0012] Preferably, as an improvement, both the end bushing and the beginning bushing include an inner bushing and an outer bushing that fit together and are fixedly connected. The oil circuit includes an oil inlet hole, an annular oil inlet groove, and an oil injection channel. The oil inlet hole is located on the outer bushing, the annular oil inlet groove is located on the circumferential surface where the inner bushing and the outer bushing are in contact, and the oil injection channel is located on the inner bushing.

[0013] Beneficial effects: When adopting this solution, the cooperation of the inner and outer bushings makes it easy to install the corresponding bearings and to fix them to the test chamber. At the same time, by setting an annular oil inlet groove on the mating circumference of the inner and outer bushings, the difficulty of installing the inner and outer bushings is reduced, and it can be ensured that the lubricating oil enters from the oil inlet hole, passes through the annular oil inlet groove, and is sprayed onto the corresponding bearing in a splashing manner from the oil spray channel, thus taking into account both the ease of installation and the rationality of lubrication.

[0014] Preferably, as an improvement, the oil circuit further includes an oil outlet channel with the outlet of the oil outlet channel facing the middle of the test shaft, and an oil return port is provided at the bottom center of the test chamber.

[0015] Beneficial effects: When using this solution, the lubricating oil can be discharged in time through the oil outlet channel; because the outlet of the oil outlet channel faces the middle of the test shaft, the used lubricating oil can flow quickly to the middle of the test chamber and then be discharged quickly from the return oil port.

[0016] Preferably, as an improvement, a head end cap is also fixed to the outside of the head end bushing. The head end cap is sleeved on the test shaft and has multiple air jet channels for blowing air into the test chamber. The outlet of each air jet channel faces the test shaft.

[0017] Beneficial effects: This solution, by setting a front end cap, seals the end of the test shaft that extends into the test chamber. Furthermore, multiple air jet channels on the front end cap inject air into the test chamber, creating an air wall on the test shaft to prevent lubricating oil leakage. Additionally, the air jet channels eliminate the need for a sealing ring on the front end cap, avoiding the frictional heating and sealing ring failure issues associated with sealing rings.

[0018] Preferably, as an improvement, the intermediate loading assembly includes a test bearing and a carrier. The test bearing is installed between the carrier and the test shaft. The test bearings are used in pairs and are self-aligning ball bearings or angular contact bearings. The carrier is used to apply radial loads and eccentric axial loads.

[0019] Beneficial effects: This scheme uses paired test bearings, which are self-aligning ball bearings or angular contact bearings, to ensure that the test bearings can withstand radial loads and eccentric axial loads without easily being damaged, thus ensuring the reliability of the test device; and the load-bearing body facilitates the application of radial loads and eccentric axial loads.

[0020] Preferably, as an improvement, the carrier is provided with an oil inlet channel and an oil outlet channel, the flow channel cross-section of the oil inlet channel is larger than that of the oil outlet channel, and an outer spacer is provided between the outer rings of the two test bearings. The outer spacer is provided with a through hole for connecting the oil inlet channel and the oil outlet channel.

[0021] Beneficial effects: When adopting this scheme, the oil discharge channel with a small cross-section is set so that the oil inlet speed is greater than the oil outlet speed, which facilitates the formation of a lubricating oil cavity in the space between the outer spacer and the test shaft. The lubricating oil can achieve immersion lubrication of the test bearings on both sides of the outer spacer. This not only takes into account the simplicity of the lubrication structure and lubrication method, but also ensures the working stability of the test bearings under long-term testing.

[0022] Preferably, as an improvement, the carrier, the first bushing, and the last bushing are all provided with temperature detection through holes and vibration detection through holes. One end of each temperature detection through hole and vibration detection through hole is directly facing the outer ring of the bearing. The temperature detection through hole can accommodate the sensing probe of a temperature sensor, and the vibration detection through hole can accommodate the probe of a vibration meter.

[0023] Beneficial effects: By setting up temperature detection through holes and vibration detection through holes, this solution allows for the installation of temperature sensor probes and vibration meter probes to monitor the temperature and vibration of each bearing during the test process. This facilitates real-time monitoring of the test process and ensures the reliability of the test. Attached Figure Description

[0024] Figure 1 This is a front sectional view of an embodiment of the present invention.

[0025] Figure 2 for Figure 1 The front sectional view after removing the test chamber and the external support structure.

[0026] Figure 3 A right-side view of the left inner bushing in an embodiment of the present invention.

[0027] Figure 4 for Figure 3 AA section view in the image.

[0028] Figure 5 for Figure 3 BB section view in the middle.

[0029] Figure 6 This is a right-side view of the external support body in an embodiment of the present invention.

[0030] Figure 7 for Figure 6 The C-direction view in the image.

[0031] Figure 8 for Figure 6 DD section view in the image.

[0032] Figure 9 This is a right-side view of the inner carrier in an embodiment of the present invention.

[0033] Figure 10 for Figure 9 EE section view in the image. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] The reference numerals in the accompanying drawings include: 1. End cap; 2. Screw; 3. O-ring seal; 4. Screw; 5. Pressure plate bearing; 6. Right-hand nut; 7. Left inner bushing; 8. Pressure plate fixing screw; 9. Left outer bushing; 10. Locking screw; 11. Left inner spacer; 12. Screw; 13. Middle end cap; 14. Inner bearing; 15. Outer spacer; 16. Outer bearing; 17. Self-aligning ball bearing; 18. Pressure plate; 19. Right inner bushing; 20. Right inner spacer; 21. Cylindrical roller bearing; 22. Left-hand nut; 23. Test shaft. 23. Head end cap; 24. Sealing bushing; 25. Screw; 26. Screw; 27. Screw; 28. Right outer bushing; 29. ​​Receiving groove; 71. Oil inlet hole; 91. Annular oil inlet groove; 72. Oil injection channel; 73. Oil injection hole; 74. Oil outlet channel; 75. Positioning threaded hole; 76. Air inlet hole; 251. Annular air groove; 252. Air jet channel; 241. Oil inlet channel; 161. Oil outlet channel; 162. Strip groove; 163. Annular oil groove; 151. Temperature detection through hole; 77. Vibration detection through hole; 78.

[0036] The basic implementation examples are as follows: Figures 1 to 10 As shown.

[0037] Combination Figure 1 A test bench apparatus for bearing life with pressure plate includes a test shaft 23 and a test chamber. The test shaft 23 extends into the test chamber. From left to right, the test shaft 23 is provided with an end bearing assembly, an intermediate loading assembly, and a first end bearing assembly. The pressure plate bearing 5 under test is placed on the end bearing assembly. The end bearing assembly and the first end bearing assembly are used to connect with the test chamber. The end bearing assembly and the first end bearing assembly support the test shaft 23 in the test chamber. The intermediate loading assembly is used to load radial load and eccentric axial load.

[0038] Combination Figure 2The end bearing assembly includes a test pressure plate bearing 5, a left inner bushing 7, a left outer bushing 9, and an end cap 1. The left inner bushing 7 and the left outer bushing 9 constitute the end bushing. The left inner bushing 7 has a receiving groove 71 for accommodating the test pressure plate bearing 5. The receiving groove 71 is clearance-fitted with the outer ring of the pressure plate bearing 5. The pressure plate bearing 5 is installed between the test shaft 23 and the left inner bushing 7. The left inner bushing 7 has a clearance groove for accommodating the protrusion on the pressure plate of the pressure plate bearing 5. There is a gap between the clearance groove and the protrusion. The left inner bushing 7 opposite the clearance groove has a countersunk hole, so that the pressure plate of the test pressure plate bearing 5 and the left inner bushing 7 can be fixedly connected by screws through the countersunk hole, and the pressure plate of the pressure plate bearing 5 and the left inner bushing 7 are in a non-contact state, so as to facilitate the simulation of the torque of the actual vehicle to lock the pressure plate. The left outer bushing 9 is fitted around the left inner bushing 7. The end cap 1 is fixedly connected to the left end face of both the left outer bushing 9 and the left inner bushing 7. The end cap 1 seals the space at the left end of the test shaft 23. The left outer bushing 9 is fixedly connected to the test chamber by bolts.

[0039] The first-end bearing assembly includes a cylindrical roller bearing 21, a right inner bushing 19, a right outer bushing 29, a cover plate 18, a first-end cover 24, and a sealing bushing 25. The inner and outer rings of the cylindrical roller bearing 21 are axially separable. The cylindrical roller bearing 21 is a short cylindrical roller bearing 21. The right inner bushing 19 and the right outer bushing 29 constitute the first-end bushing. The right outer bushing 29 is fitted onto the right inner bushing 19. The right inner bushing 19 has a mounting groove for mounting the cylindrical roller bearing 21. The cover plate 18... 8 is used to press the cylindrical roller bearing 21 against the mounting groove along the axial direction. The cover plate 18 is located between the intermediate bearing assembly and the right inner bushing 19. The cover plate 18 and the first end cover 24 are respectively attached to the left and right end faces of the right inner bushing 19. The cover plate 18 and the first end cover 24 are both fixedly connected to the right inner bushing 19 by bolts. The first end cover 24 is also fixedly connected to the right outer bushing 29. The first end cover 24 is fitted on the test shaft 23. The right outer bushing 29 is fixedly connected to the test chamber by bolts.

[0040] Combination Figures 2 to 5The first and last bushings have the same oil passage. Both the first and last bushings use splash lubrication to lubricate the corresponding bearings. The oil passage includes an oil inlet 91, an annular oil inlet groove 72, an oil spray channel 73, and an oil outlet channel 75. The oil inlet 91 is located on the outer bushing (including the left outer bushing 9 and the right outer bushing 29). The annular oil inlet groove 72 is located on the circumferential surface where the inner bushing and the outer bushing are in contact. In this embodiment, the annular oil inlet groove 72 is located on the outer circumferential surface of the inner bushing (including the left inner bushing 7 and the right inner bushing 19). The oil spray channel 73 and the oil outlet channel 75 are both located on the inner bushing. The end of the oil spray channel 73 is an oil spray hole 74. The oil outlet channel 75 is L-shaped. The oil inlet end of the oil outlet channel 75 is perpendicular to the test shaft 23, and the oil outlet end of the oil outlet channel 75 is parallel to the test shaft 23 and faces the middle of the test shaft 23. When the left outer bushing 9 and the right outer bushing 29 are installed on the test chamber, their oil inlets 91 are aligned with the oil supply ports on the test chamber. To prevent the oil outlet channel 75 from being blocked by the pressure plate bearing 5 or the pressure cover plate 18, the oil outlet channel 75 is placed in the clearance area of ​​the pressure plate of the pressure plate bearing 5 and in the clearance area of ​​the pressure cover plate 18, ensuring that the oil outlet is not blocked by the pressure cover plate 18 and the pressure plate bearing 5.

[0041] To improve the effect of splash lubrication, there are two oil injection channels 73, which are symmetrically arranged. Each oil injection channel 73 includes an oil inlet section and an injection section. The flow channel cross-section of the injection section is smaller than that of the oil inlet section, so that the lubricating oil can be sprayed onto the corresponding bearing (the test pressure plate bearing 5 or the cylindrical roller bearing 21) in a splash manner.

[0042] In addition, to better seal the test device and prevent oil leakage, the sealing bushing 25 of the first end bearing component is fixedly fitted onto the first end cover 24, and an air inlet 251 is provided on the sealing bushing 25. An annular air groove 252 is provided on the surface of the sealing bushing 25 that is in contact with the first end cover 24. In this embodiment, the annular air groove 252 is provided on the sealing bushing 25. An inclined inward jet channel 241 is machined on the first end cover 24. The outlet of the jet channel 241 faces the test shaft 23. The annular air groove 252 is connected to the air inlet 251 and the jet channel 241. There are multiple jet channels 241. Multiple jet channels are evenly distributed around the circumference of the test shaft 23 so that the gas ejected from the jet channels can form an air wall on the surface of the test shaft 23 to prevent lubricating oil from leaking out of the test chamber along the test shaft 23.

[0043] Combination Figure 1 , Figure 2 , Figures 6 to 10The intermediate loading assembly includes an inner bearing 14, an outer bearing 16, an outer spacer 15, two self-aligning ball bearings 17, and two intermediate end caps. The outer bearing 16 is fitted onto the inner bearing 14. The two self-aligning ball bearings 17 are installed in the middle of the test shaft 23. The outer spacer 15 is positioned between the outer rings of the two test bearings. The inner bearing 14 simultaneously covers the outer spacer 15 and the self-aligning ball bearings 17. The two intermediate end caps are located on the left and right sides of the outer bearing 16 and are fixedly connected to the outer bearing 16 with screws. The end face of the intermediate end cap is in contact with the end face of the inner bearing 14 and the end face of the outer ring of the self-aligning ball bearing 17. The outer ring of the self-aligning ball bearing 17 is axially limited by the outer spacer 15 and the intermediate end caps. The inner ring of the self-aligning ball bearing 17 is axially limited by the step on the test shaft 23 and the inner spacer fitted on the test shaft 23. Of course, the self-aligning ball bearing 17 in this embodiment can also be replaced with an angular contact bearing capable of withstanding radial loads and axial bending moments.

[0044] In this embodiment, to achieve lubrication of the self-aligning ball bearing 17, an oil inlet channel 161 and an oil outlet channel 162 are provided on both the outer carrier 16 and the inner carrier 14. The flow channel cross-section of the oil inlet channel 161 is larger than that of the oil outlet channel 162. The oil inlet channels 161 of the outer carrier 16 and the inner carrier 14 are connected, and the oil outlet channels 162 of the outer carrier 16 and the inner carrier 14 are also connected. Multiple evenly distributed through holes are machined on the circumference of the outer spacer 15. Annular oil grooves 151 communicating with the through holes are also machined on the inner hole and outer circumference of the outer spacer 15. The through holes are used to connect the oil inlet channel 161 and the oil outlet channel 162 through the annular oil grooves 151.

[0045] Combination Figure 4 , Figure 9 and Figure 10 To ensure that the inner bearing 14 can be assembled with the outer bearing 16 very quickly and accurately, and to ensure that the inner bushing can be accurately installed with the outer bushing, radial positioning threaded holes 76 are machined on both the inner bearing 14 and the inner bushing. A stop pin (or stop screw) protruding from the positioning threaded hole 76 can be fixedly installed on the positioning threaded hole 76. A strip groove 163 is machined on both the outer bearing 16 and the outer bushing. The strip groove 163 is parallel to the axial direction of the test shaft 23. The stop pin can slide into the strip groove 163 along the axial direction. The stop pin can also prevent the inner bearing 14 from rotating circumferentially relative to the outer bearing 16. The stop pin can also prevent the inner bushing from rotating circumferentially relative to the outer bushing during the assembly process, reducing the difficulty of installation.

[0046] To enable monitoring of the test process, temperature detection through holes 77 and vibration detection through holes 78 are machined on the carrier, the first bushing, and the last bushing. One end of the temperature detection through hole 77 and the vibration detection through hole 78 is directly facing the outer ring of the bearing. The temperature detection through hole 77 can accommodate the sensing probe of the temperature sensor, and the vibration detection through hole 78 can accommodate the probe of the vibration meter.

[0047] The specific process of this embodiment is as follows:

[0048] I. Assemble the test apparatus

[0049] First press Figure 1 and Figure 2 As shown, two sets of self-aligning ball bearings 17 are pressed into the test shaft 23, the left inner spacer 11 is installed into the left end of the test shaft 23, the pressure plate bearing 5 is pressed into the test shaft 23 as shown in the figure, and locked with a right-hand nut 6; the right inner spacer 20 is installed into the right end of the test shaft 23, the separable inner ring of the cylindrical roller bearing 21 is pressed into the test shaft 23, and locked with a left-hand nut 22, forming a complete test shaft assembly.

[0050] Next, insert the inner carrier 14 into the outer carrier 16 at the corresponding position. During installation, align the retaining pin on the inner carrier 14 with the slot of the outer carrier to achieve quick alignment and installation. Insert the split outer spacer 15 into the two sets of self-aligning ball bearings 17. Install the inner carrier 14 with the outer carrier 16 from right to left onto the two sets of self-aligning ball bearings 17 and the outer spacer 15. The left and right sides of the inner carrier 14 are connected to the outer carrier 16 with the split end cap 13 using screws 12. Then, insert the left inner bushing 7 and... Install and connect the pressure plate bearing 5, align the threaded hole position, and tighten it with the pressure plate fixing screw 8 according to the torque requirements; insert the stop screw 10 into the positioning threaded hole 76 of the left inner bushing 7, align the strip groove on the left outer bushing 9 with the stop screw 10 to achieve alignment between the left outer bushing 9 and the left inner bushing 7, install the end cap 1, O-ring seal 3, and left inner bushing 7 into the left outer bushing 9, and lock the end cap 1 and left inner bushing 7 with screw 4, and lock the end cap 1 and left outer bushing 9 with screw 2 to form the end bearing assembly.

[0051] Next, the separable outer ring of the cylindrical roller bearing 21 is installed into the right inner bushing 19, and the right inner bushing 19 is installed into the right outer bushing 29. The first end cap 24 is locked to the right outer bushing 29 with screws 28. The split cover plate 18 is connected to the right inner bushing 19, the threaded hole positions are aligned, and the cover plate 18, the right inner bushing 19 and the first end cap 24 are locked with screws 27. The sealing bushing 25 is locked to the first end cap 24 with screws 26 to form the first end bearing assembly. The outer ring of the split cylindrical roller bearing 21 in this assembly is installed into the inner ring from right to left. After all the installations are completed, the test head assembly is formed.

[0052] Finally, the aforementioned test assembly was hoisted into the test chamber. The oil inlets at the bottom of the left outer bushing 9 and the right outer bushing 29 were aligned with the lubrication oil supply port of the test chamber. The oil inlet channel on the outer bearing 16 was connected to the lubrication oil pipe, and the outer bearing 16 was connected to the axial and radial loading mechanisms. The air inlet of the sealing bushing 25 was connected to the air intake path. The probe of the vibration meter was installed on the vibration detection through hole, and the probe of the temperature sensor was installed on the temperature detection through hole. The vibration meter, temperature sensor, and control system were then connected.

[0053] II. Life test of the test equipment

[0054] During the test, the test shaft 23 is rotated by a motor. In this embodiment, the rotation speed of the test shaft 23 is 12000-16000 r / min. During the test, the outer ring temperature and vibration of the test pressure plate bearing 5, self-aligning ball bearing 17 and cylindrical roller bearing 21 are monitored in real time by temperature sensors and vibration meters. This helps to ensure the reliability of the test. At the same time, by monitoring the temperature and vibration in real time, the controller can actively control the motor to stop when the data measured by the temperature sensor or vibration meter exceeds the preset value, so as to avoid the situation where the bearing has failed but the test continues. This ensures that the test device can safely, reliably and accurately achieve the life test of the pressure plate bearing 5.

[0055] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A test bench apparatus for bearing life with a pressure plate, comprising a test shaft and a test chamber, wherein the test shaft extends into the test chamber, characterized in that: It also includes an intermediate loading assembly installed in the middle of the test shaft and an end bushing installed at the free end of the test shaft. The end bushing can be fixedly connected to the test chamber. The end bushing is provided with a receiving groove for accommodating the test pressure plate bearing. The pressure plate of the test pressure plate bearing can be fixedly connected to the end bushing and press the outer ring of the pressure plate bearing against the receiving groove. The intermediate loading assembly is used to load radial load and eccentric axial load. The intermediate loading assembly includes a test bearing and a carrier. The test bearing is installed between the carrier and the test shaft. The test bearings are used in pairs and are self-aligning ball bearings. The carrier is used to apply radial loads and eccentric axial loads. The carrier is provided with an oil inlet channel and an oil outlet channel. The flow channel cross-section of the oil inlet channel is larger than that of the oil outlet channel. An outer spacer is provided between the outer rings of the two test bearings. The outer spacer is provided with a through hole for connecting the oil inlet channel and the oil outlet channel. It also includes cylindrical roller bearings mounted on the test shaft. The cylindrical roller bearings are located at the end of the test shaft closer to the power input. The outer ring of the cylindrical roller bearings is mounted on the test chamber. The inner and outer rings of the cylindrical roller bearings can be separated axially. A first-end bushing is installed between the cylindrical roller bearing and the test chamber. Both the first-end bushing and the last-end bushing are equipped with the same oil passage. The oil passage of the first-end bushing is used for splash lubrication of the cylindrical roller bearing, and the oil passage of the last-end bushing is used for splash lubrication of the test pressure plate bearing. The outer side of the head end bushing is also fixed with a head end cap, which is fitted onto the test shaft. The head end cap is provided with multiple air jet channels for blowing air into the test chamber. The air jet channels are inclined inward, and the outlet of each air jet channel faces the test shaft.

2. The bearing life test bench apparatus with pressure plate according to claim 1, characterized in that: Both the end bushing and the beginning bushing include an inner bushing and an outer bushing that fit together and are fixedly connected. The oil circuit includes an oil inlet hole, an annular oil inlet groove, and an oil injection channel. The oil inlet hole is located on the outer bushing, the annular oil inlet groove is located on the circumferential surface where the inner bushing and the outer bushing are in contact, and the oil injection channel is located on the inner bushing.

3. The bearing life test bench device with pressure plate according to claim 2, characterized in that: The oil circuit also includes an oil outlet channel, the outlet of which faces the middle of the test shaft, and an oil return port is provided at the bottom center of the test chamber.

4. The bearing life test bench device with pressure plate according to claim 1, characterized in that: The carrier, the first bushing, and the last bushing are all provided with temperature detection through holes and vibration detection through holes. One end of each temperature detection through hole and vibration detection through hole is directly facing the outer ring of the bearing. The temperature detection through hole can accommodate the sensing probe of a temperature sensor, and the vibration detection through hole can accommodate the probe of a vibration meter.

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