Bearing axial loading test device and working method

Abstract

The invention relates to a bearing axial loading test device and a working method, belongs to the technical field of bearing testing, and solves the defects of a current bearing axial loading test device. The bearing axial loading test device comprises a main shaft with a vertical axis, the main shaft is connected with a power mechanism, and the main shaft is connected with one end of a torque sensor; the other end of the torque sensor is used for being connected with a fixed shaft, the fixed shaft is used for being fixed with an inner ring of a bearing to be tested, the balancing weight is provided with a through stepped hole, and the stepped hole comprises a first hole section, a second hole section and a third hole end which are arranged in sequence; the diameter of the first hole section is smaller than that of the second hole section and smaller than the outer diameter of the outer ring of the bearing to be tested, the second hole section can be in interference fit with the outer ring of the bearing to be tested, and the diameter of the third hole section is larger than the outer diameter of the outer ring of the bearing to be tested. And the accuracy of a test result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing testing, and particularly relates to a bearing axial loading test device and a working method thereof. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] As a key basic component in a mechanical transmission system, the performance of a bearing directly affects the reliability, efficiency, and service life of equipment operation. Currently, hydraulic or multi-cylinder loading systems are mostly used for axial loading during bearing performance testing. For example, patent application CN117330312A discloses a bearing comprehensive performance testing device capable of providing combined axial and radial loads. Its axial loading component consists of an axial loading component body, an axial loading hydraulic cylinder, an axial pressure sensor, and an axial loading indenter. The axial loading hydraulic cylinder is used to apply axial load to the bearing. Although such a device can achieve high-precision load control, it has problems such as complex structure, high equipment cost, and high maintenance technical requirements. Especially for small and medium-sized enterprises and research institutions, its use threshold significantly limits the testing efficiency. Moreover, during the actual working process of the bearing, the bearing operates in a closed space filled with lubricating medium. The above-mentioned testing device exposes the bearing to the external environment for testing, unable to truly simulate the actual working scenario of the bearing, which affects the accuracy of the test results. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a bearing axial loading test device and a working method thereof, which overcome the defects existing in using a hydraulic cylinder for loading, and at the same time can simulate the actual working scenario of the bearing, improving the accuracy of the test results.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: In a first aspect, an embodiment of the present invention provides a bearing axial loading test device, including a main shaft with a vertically arranged axis. The main shaft is connected to a power mechanism. One end of the main shaft is connected to a torque sensor, and the other end of the torque sensor is used to be connected to a fixed shaft. The fixed shaft is used to fix the inner ring of the bearing to be tested. The device further includes a counterweight block. The counterweight block is provided with a through stepped hole, and the stepped hole includes a first hole section, a second hole section, and a third hole section arranged in sequence. The diameter of the first hole section is smaller than the diameter of the second hole section and the diameter of the first hole section is smaller than the outer diameter of the outer ring of the bearing to be tested. The second hole section can be in interference fit with the outer ring of the bearing to be tested, and the diameter of the third hole section is larger than the outer diameter of the outer ring of the bearing to be tested.

[0006] Optionally, the power mechanism is connected to the lifting part of the lifting mechanism. The bearing axial loading test device further includes a lubricating medium container for containing a lubricating medium, and the lubricating medium container is configured to be disposed below the fixed shaft so that the bearing to be tested can be immersed in the lubricating medium inside the lubricating medium container.

[0007] Optionally, a positioning pin is provided in the lubricating medium container. Correspondingly, the counterweight is provided with a positioning hole matching the positioning pin, and the positioning pin can be inserted into the positioning hole to prevent the counterweight from rotating.

[0008] Optionally, the torque sensor is fixedly connected to the lifting part of the lifting mechanism through a fixing member.

[0009] Optionally, the bottom end of the lifting mechanism and the lubricating medium container are both fixed on the platform plate.

[0010] Optionally, an annular boss is provided on the shaft surface of the fixed shaft. The annular boss is used to contact one end face of the inner ring of the bearing to be tested. A retaining ring for contacting the other end face of the inner ring of the bearing to be tested is also sleeved on the fixed shaft. A locking member threadedly connected to the fixed shaft is provided on one side of the retaining ring, and the locking member can press the retaining ring against the end face of the inner ring of the bearing to be tested.

[0011] Optionally, a groove is formed on the hole surface of the first hole section. The top end of the groove extends to the top end of the first hole section, and the bottom end of the groove extends to the bottom end of the first hole section.

[0012] Optionally, there is at least one set of grooves. Two grooves in the same set are arranged at an interval of 180° along the circumferential direction of the first hole section.

[0013] Optionally, one end of the torque sensor is connected to the main shaft through a first coupling, and the other end is connected with a second coupling. The other end of the torque sensor can be connected to the fixed shaft through the second coupling.

[0014] In a second aspect, an embodiment of the present invention provides a working method of the bearing axial loading test device described in the first aspect: Pass the fixed shaft through the inner ring of the bearing and fixedly connect it to the inner ring of the bearing; Assemble the counterweight with the outer ring of the bearing, wherein the stepped structure formed between the first hole section and the second hole section presses against the upper end face of the bearing outer ring, and the bearing outer ring is in interference fit with the second hole section; Connect the fixed shaft to the torque sensor; The power mechanism works, transmits the power to the fixed shaft through the main shaft and the torque sensor, the fixed shaft drives the inner ring of the bearing to be tested to rotate, and the friction torque of the bearing to be tested is read in real time through the torque sensor.

[0015] The beneficial effects of the present invention are as follows: 1. The axial loading test device for bearings of the present invention, the counterweight block is provided with a first hole section and a second hole section. The diameter of the first hole section is smaller than that of the second hole section and the diameter of the first hole section is smaller than the outer diameter of the bearing under test. Such that the stepped structure formed by the first hole section and the second hole section can press on the upper end surface of the outer ring of the bearing under test, thereby applying an axial load to the bearing. The second hole section can be in interference fit with the outer ring of the bearing, thus avoiding the phenomenon of slipping between the second hole section and the outer ring of the bearing. By applying an axial load to the bearing through the counterweight block, compared with applying an axial load to the bearing by using a hydraulic cylinder or the like, the cost and maintenance technical requirements of the test device are greatly reduced, and it is applicable to the axial loading of bearings with relatively small sizes. 2. The axial loading test device for bearings of the present invention is provided with a lubricating medium container. Driven by the lifting mechanism, the counterweight block and the connected bearing can be immersed in the lubricating medium in the lubricating medium container, so that the bearing can be immersed in the lubricating medium during the test. Moreover, the lubricating medium container is provided with a positioning pin, and the positioning pin can cooperate with the positioning hole of the counterweight block to prevent the counterweight block from rotating, so that the inner ring of the bearing rotates while the outer ring is fixed, which can more truly simulate the actual working environment of the bearing and make the test results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0017] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present invention; Figure 2 is the assembly schematic diagram of the counterweight block and the bearing under test in Embodiment 1 of the present invention; Figure 3 is the schematic diagram of the cooperation between the positioning pin in the lubricating medium container and the positioning hole of the counterweight block in Embodiment 1 of the present invention; Wherein, 1. main shaft, 2. platform plate, 3. torque sensor, 4. fixed shaft, 5. bearing, 6. counterweight block, 7. lubricating medium container, 8. rotation drive system, 9. tap chuck, 10. lifting plate, 11. power mechanism fixing seat, 12. handle, 13. first coupling, 14. second coupling, 15. fixed sleeve, 16. control system, 17. annular boss, 18. retaining ring, 19. locking nut, 20. positioning pin; 601. first hole section, 602. second hole section, 603. third hole section, 604. groove, 605. positioning hole. DETAILED DESCRIPTION OF THE INVENTION

[0018] Embodiment 1 This embodiment provides an axial loading test device for bearings, as Figure 1As shown in the figure, it includes a main shaft 1, the axis of the main shaft 1 is vertically arranged, the main shaft 1 is connected to a power mechanism, the power mechanism can drive the main shaft 1 to rotate around its own axis, the power mechanism is connected to a lifting mechanism, and the lifting mechanism can drive the power mechanism to lift, so as to drive the main shaft 1 to lift. The bottom end of the lifting mechanism is fixed on the platform plate 2 and is supported by the platform plate 2. One end of the main shaft 1 is connected to a torque sensor 3, and the other end of the torque sensor 3 is used to connect to the top end of a fixed shaft 4, and the fixed shaft 4 is used to fix the inner ring of the bearing 5 to be tested. The bearing axial loading test device also includes a counterweight 6 that matches the bearing 5 to be tested. The counterweight 6 is used to assemble with the outer ring of the bearing 5 to be tested, and during operation, it applies an axial load to the bearing 5 using its own gravity. The bearing axial loading test device also includes a lubricating medium container 7, and the lubricating medium container 7 is used to hold the lubricating medium. The lubricating medium container 7 is placed on the platform plate 2 and fixed to the platform plate 2. When in use, the lubricating medium container 7 is used to be arranged below the fixed shaft 4 so that the fixed shaft 4 can drive the counterweight 6 and the bearing 5 to be tested to immerse in the lubricating medium contained in the lubricating medium container 7.

[0019] The power mechanism adopts the power mechanism on a engraving machine, including a rotation drive system 8. The rotation drive system 8 is connected to the power shaft of the engraving machine. The power shaft of the engraving machine is fixedly connected to the top end of the main shaft 1 through a tap chuck 9. The power shaft of the engraving machine is coaxially arranged with the main shaft 1, and the power shaft of the engraving machine can drive the main shaft 1 to rotate around its own axis through the tap chuck 9.

[0020] In this embodiment, the rotation speed of the power shaft of the engraving machine can be adjusted within the range of 0 rpm - 24000 rpm.

[0021] The tap chuck 9 can adopt existing components, and its specific structure will not be described in detail here. The rotation drive system 8 can adopt the rotation drive system on an existing engraving machine, and its specific structure will not be described in detail here.

[0022] The lifting mechanism adopts the lifting mechanism on an engraving machine. The lifting mechanism adopts a lead screw lifting mechanism, including a mounting seat. The bottom end of the mounting seat is fixed on the platform plate 2. A lead screw with a vertically arranged axis is provided on the mounting seat. The two ends of the lead screw are rotatably connected to bearing seats, and the bearing seats are fixed on the mounting seat. The lead screw is connected to a lead screw slider, and the lead screw slider is fixedly connected to a lifting plate 10. The lifting plate 10 is the lifting part of the lifting mechanism. The lifting plate 10 is slidably connected to the mounting seat. By rotating the lead screw, the lifting plate 10 can be driven to move up and down vertically.

[0023] The power mechanism fixing seat 11 is fixedly connected to the lifting plate 10, and the rotation drive system 8 is fixedly connected to the power mechanism fixing seat 11, so as to use the lifting plate 10 for lifting movement.

[0024] Further, in order to facilitate the staff to rotate the lead screw, a handle 12 is provided at the top end of the lead screw, and the staff can drive the lead screw to rotate around its own axis through the handle 12.

[0025] The top end of the main shaft 1 is fixedly connected to the tap chuck 9, the bottom end of the main shaft 1 is connected to the input shaft at one end of the torque sensor 3 through the first coupling 13, the output shaft at the other end of the torque sensor 3 is connected with a second coupling 14, and the output shaft at the other end of the torque sensor 3 can be connected to the top end of the fixed shaft 4 through the second coupling 14.

[0026] In this embodiment, the measurement range of the torque sensor 3 is 0 Nm - 3 Nm.

[0027] The torque sensor 3 is fixedly connected to the lifting plate 10 through a fixing member. The fixing member adopts a U-shaped fixing sleeve 15. The housing of the torque sensor 3 is fixed in the space inside the fixing sleeve 15, and the fixing sleeve 15 is fixedly connected to the lifting plate 10 through bolts.

[0028] The torque sensor 3 is connected to the control system 16 provided on the platform plate 2, and can transmit the measured friction torque value of the bearing 5 to the control system 16. The control system 16 is connected to the display screen and can display the friction torque value on the display screen.

[0029] The first coupling 13 and the second coupling 14 are plum blossom couplings or spring couplings, and those skilled in the art can select according to actual needs.

[0030] The diameter of the fixed shaft 4 matches the inner diameter of the inner ring of the bearing 5 to be tested. The inner ring of the bearing 5 to be tested can be sleeved on the outer periphery of the fixed shaft 4. The bearing 5 to be tested is a deep groove ball bearing, an angular contact ball bearing, a tapered roller bearing or other bearings that can withstand axial force, and the inner diameter of the bearing 5 is 3 mm - 20 mm.

[0031] In this embodiment, the material of the fixed shaft 4 is No. 45 steel or stainless steel, and those skilled in the art can select according to actual needs.

[0032] As Figure 2 shown, in order to realize the locking and fixing between the fixed shaft 4 and the inner ring of the bearing 5 to be tested, a ring-shaped boss 17 is provided on the fixed shaft 4. The ring-shaped boss 17 can contact the upper end surface of the inner ring of the bearing 5 to be tested. A retaining ring 18 is also sleeved on the fixed shaft 4. The retaining ring 18 can contact the lower end surface of the inner ring of the bearing 5. A locking member is provided below the retaining ring 18. The locking member is threadedly connected to the fixed shaft 4. In this embodiment, the locking member adopts a locking nut 19. By rotating the locking nut 19, the locking nut 19 can press the inner ring of the bearing 5 against the surface of the ring-shaped boss 17 through the retaining ring 18, thereby realizing the locking and fixing between the fixed shaft 4 and the inner ring of the bearing 5 to be tested.

[0033] The bearing axial loading test device further includes a counterweight 6, which is used to cooperate with the outer ring of the bearing 5 to be tested and apply an axial load to the bearing 5 to be tested.

[0034] The counterweight 6 is made of resin, aluminum, steel or lead block, and those skilled in the art can select according to actual needs. The counterweight 6 adopts a cylindrical structure. In other embodiments, the counterweight 6 can also adopt a cuboid or cube structure, and those skilled in the art can select according to actual needs. The weight of the counterweight 6 is 0.1 kg - 5 kg, and the weight of the counterweight 6 can be set according to the test requirements, and no detailed description will be given here.

[0035] A stepped hole is provided through the center of the counterweight 6, and the top end of the stepped hole extends to the top surface of the counterweight 6, and the bottom end extends to the bottom surface of the counterweight 6.

[0036] Along the direction from the top surface to the bottom surface of the counterweight 6, the stepped hole includes a first hole section 601, a second hole section 602 and a third hole section 603 arranged in sequence.

[0037] The diameter of the first hole section 601 is smaller than the diameter of the second hole section 602, and the diameter of the first hole section 601 is smaller than the outer diameter of the outer ring of the bearing 5 to be tested. A stepped structure can be formed between the first hole section 601 and the second hole section 602, and the stepped structure contacts the upper end surface of the outer ring of the bearing 5 to be tested, so that the counterweight 6 can apply an axial load to the bearing 5 to be tested.

[0038] The diameter of the second hole section 602 matches the outer diameter of the outer ring of the bearing 5 to be tested so that the second hole section 602 can be in interference fit with the outer ring of the bearing 5 to prevent slipping between the second hole section 602 and the outer ring of the bearing 5. The diameter of the second hole section 602 can be set according to the outer diameter of the outer ring of the bearing 5, and no detailed description will be given here.

[0039] The diameter of the third hole section 603 is larger than the diameter of the outer ring of the bearing 5 to be tested.

[0040] When the counterweight 6 is assembled with the outer ring of the bearing 5, the counterweight 6 is sleeved on the outer periphery of the outer ring of the bearing 5 along the direction from top to bottom, wherein the second hole section 602 is in interference fit with the outer ring of the bearing 5, and the stepped structure formed by the first hole section 601 and the second hole section 602 cooperates with the upper end surface of the outer ring of the bearing 5.

[0041] Further, since the second hole section 602 is in interference fit with the outer ring of the bearing 5, in order to facilitate the separation of the bearing 5 and the counterweight 6 after the test, a groove 604 is provided on the hole surface of the first hole section 601. The groove 604 is arranged along the axial direction of the stepped hole. The top of the groove 604 extends to the top end of the first hole section 601, and the bottom of the groove 604 extends to the bottom end of the first hole section 601. Through the groove 604, it is convenient for the staff to push the bearing 5 to be tested in the direction from top to bottom, so that the bearing 5 is separated from the counterweight 6.

[0042] Further, at least one set of grooves 604 is provided on the hole surface of the first hole section 601. In this embodiment, one set of grooves 604 is provided on the hole surface of the first hole section 601. This set of grooves 604 includes two oppositely arranged grooves 604, that is, the two grooves 604 are arranged at an interval of 180° along the circumferential direction of the first hole section 601.

[0043] The staff can use tools to pass through the groove 604 to push the bearing 5 out of the counterweight 6, realizing the separation of the bearing 5 and the counterweight 6.

[0044] The bearing axial loading test device further includes a lubricating medium container 7. The top of the lubricating medium container 7 is open. The lubricating medium container 7 adopts a cylindrical container or a cubic container, etc. In this embodiment, the lubricating medium container 7 adopts a cylindrical container. The lubricating medium container 7 is placed on the platform plate 2 and fixed to the platform plate 2 by bolts. Preferably, a rectangular fixing plate is provided at the bottom of the lubricating medium container 7, and long strip holes are provided on both sides of the fixing plate. The lubricating medium container 7 is fixedly connected to the platform plate 2 through the long strip holes and bolts. Through the long strip holes, the position of the lubricating medium container 7 can be adjusted, so that the counterweight 6 and the bearing 5 can enter the interior of the lubricating medium container 7 under the drive of the lifting mechanism.

[0045] The lubricating medium container 7 is used to be placed below the fixed shaft 4 and the torque sensor 3, so that under the action of the lifting mechanism, the counterweight 6 and the bearing 5 can enter the internal space of the lubricating medium container 7.

[0046] The interior of the lubricating medium container 7 is used to hold the lubricating medium. The lubricating medium is water or other corrosive media, which can be selected according to the actual working conditions of the bearing 5. When the lubricating medium adopts a corrosive medium, the fixed shaft 4 is made of 304 stainless steel, avoiding the corrosion damage of the fixed shaft 4.

[0047] Further, as Figure 3As shown, in order to prevent the counterweight 6 from rotating about its own axis during the test, a positioning pin 20 is provided inside the lubricant medium container 7. The positioning pin 20 is inserted into the mounting groove provided on the bottom surface of the lubricant medium container 7. Preferably, a plurality of positioning pins 20 are provided, and the plurality of positioning pins 20 are evenly spaced along the circumferential direction of the lubricant medium container 7. A positioning hole 605 matching the positioning pin 20 is provided on the bottom surface of the counterweight 6. The diameter of the positioning hole 605 is larger than the diameter of the positioning pin 20 so that the positioning pin 20 can be inserted into the positioning hole 605 and is in clearance fit with the positioning hole 605.

[0048] The positioning pin 20 is a cylindrical pin. In other embodiments, the positioning pin 20 can also be a rectangular pin or a pin of other shapes. The shape of the positioning hole 605 matches the shape of the positioning pin 20. Those skilled in the art can select according to actual needs and will not be described in detail herein.

[0049] In this embodiment, when the counterweight 6 enters the lubricant medium container 7, the positioning pin 20 is inserted into the positioning hole 605. The cooperation between the positioning pin 20 and the positioning hole 605 prevents the counterweight 6 from rotating about its own axis.

[0050] Embodiment 2 This embodiment provides a working method of the bearing axial loading test device described in Embodiment 1. The test conditions are as follows: the axial load of the bearing 5 to be tested is 10 N, there is no radial load, the rotational speed of the main shaft 1 is 0 rpm - 8000 rpm, and the lubricant medium is deionized water.

[0051] Lift the power mechanism to the highest position through the handle 12. Use the tap chuck 9 to connect the main shaft 1 with the power shaft of the engraving machine and ensure their coaxiality. Use the first coupling 13 to connect the main shaft 1 with the torque sensor 3. Fix the torque sensor 3 to the lifting plate 10 of the lifting mechanism through the fixing sleeve 15.

[0052] Install the bearing 5 to be tested on the fixed shaft 4. The upper end surface of the inner ring of the bearing 5 contacts the annular boss 17. Use the locking nut 19 to press the retaining ring 18 against the lower end surface of the inner ring of the bearing 5, thus fixing the bearing 5 to be tested to the fixed shaft 4.

[0053] Put the counterweight 6 on the outer periphery of the outer ring of the bearing 5 in the up-down direction. The stepped structure formed by the first hole section 601 and the second hole section 602 contacts the upper end surface of the outer ring of the bearing 5. The outer ring of the bearing 5 is in interference fit with the second hole section 602.

[0054] Connect the top end of the fixed shaft 4 to the torque sensor 3 through the second coupling 14.

[0055] The lifting mechanism drives the fixed shaft 4, the counterweight 6, and the bearing 5 to be tested to move downward, so that the counterweight 6 and the bearing 5 are both immersed in the lubricating medium contained in the lubricating medium container 7 and the positioning pin 20 is inserted into the positioning hole 605. At this time, due to the settings of the first hole section 601 and the third hole section 603, the bearing 5 to be tested is immersed in the lubricating medium.

[0056] Start the power mechanism. The power mechanism drives the inner ring of the fixed shaft 4 and the bearing 5 to be tested to rotate through the torque sensor 3. The outer ring of the bearing 5 does not rotate under the action of the counterweight 6 and the positioning pin 20. The torque sensor 3 real-time collects the friction torque of the bearing 5 to be tested and transmits it to the control system 16. The control system 16 displays the received friction torque information on the display screen.

[0057] With the bearing axial loading test device and working method of this embodiment, an axial load is applied to the bearing 5 through the counterweight 6. Compared with applying an axial load using a hydraulic cylinder, etc., the cost and maintenance technical requirements of the test device are greatly reduced, and it is applicable to the axial loading of bearings with smaller sizes. Moreover, during the test process, the bearing 5 is immersed in the lubricating medium through the third hole section 603 and the first hole section 601. The positioning pin 20 can cooperate with the positioning hole 605 of the counterweight 6 to prevent the counterweight 6 and the outer ring of the bearing 5 from rotating, so that the inner ring of the bearing 5 rotates while the outer ring remains stationary, which can more truly simulate the actual working environment of the bearing 5 and make the test results more accurate.

[0058] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A bearing axial loading test device, characterized in that: It includes a main shaft with a vertical axis, the main shaft is connected to a power mechanism, the main shaft is connected to one end of a torque sensor, the other end of the torque sensor is used to be connected to a fixed shaft, the fixed shaft is used to be fixed to the inner ring of the bearing to be tested, and also includes a counterweight block, the counterweight block is provided with a through stepped hole, the stepped hole includes a first hole section, a second hole section and a third hole section arranged in sequence, the diameter of the first hole section is smaller than the diameter of the second hole section and the diameter of the first hole section is smaller than the outer diameter of the outer ring of the bearing to be tested, the second hole section can be interference fit with the outer ring of the bearing to be tested, and the diameter of the third hole section is larger than the outer diameter of the outer ring of the bearing to be tested.

2. A bearing axial loading test device according to claim 1, characterized in that: The power mechanism is connected to the lifting part of the lifting mechanism. The bearing axial loading test device also includes a lubricating medium container for containing lubricating medium. The lubricating medium container is used to be arranged below the fixed shaft so that the bearing to be tested can be immersed in the lubricating medium inside the lubricating medium container.

3. A bearing axial loading test device as claimed in claim 2, characterized in that: A positioning pin is arranged in the lubricating medium container, and correspondingly, the counterweight block is provided with a positioning hole matching the positioning pin, and the positioning pin can be inserted into the positioning hole to prevent the counterweight block from rotating.

4. A bearing axial loading test device as claimed in claim 2, characterized in that: The torque sensor is fixedly connected to the lifting part of the lifting mechanism through a fixing piece.

5. A bearing axial loading test device as claimed in claim 2, characterized in that: The bottom end of the lifting mechanism and the lubricating medium container are both fixed on the platform plate.

6. A bearing axial loading test device as claimed in claim 1, characterized in that: The axial surface of the fixed shaft is provided with an annular boss, which is used to contact the end surface of one end of the inner ring of the bearing to be tested. The fixed shaft is also covered with a retaining ring for contacting the other end surface of the inner ring of the bearing to be tested. One side of the retaining ring is provided with a locking piece threadedly connected to the fixed shaft, and the locking piece can press the retaining ring against the end surface of the inner ring of the bearing to be tested.

7. A bearing axial loading test device as claimed in claim 1, characterized in that: A groove is provided on the hole surface of the first hole segment, the top end of the groove extends to the top end of the first hole segment, and the bottom end of the groove extends to the bottom end of the first hole segment.

8. A bearing axial loading test device as claimed in claim 7, characterized in that: The grooves are provided in at least one group, and two grooves in the same group are arranged at an interval of 180° along the circumference of the first hole segment.

9. A bearing axial loading test device as claimed in claim 1, characterized in that: One end of the torque sensor is connected to the main shaft through a first coupling, and the other end is connected to a second coupling. The other end of the torque sensor can be connected to a fixed shaft through the second coupling.

10. A working method of the bearing axial loading test device according to any one of claims 1 to 9, characterized in that: Pass the fixed shaft through the inner ring of the bearing and fix it to the inner ring of the bearing; Assemble the counterweight block and the outer ring of the bearing, wherein the step structure formed between the first hole section and the second hole section is pressed on the upper end surface of the outer ring of the bearing, and the outer ring of the bearing and the second hole section are interference fit; Connect the fixed shaft to the torque sensor; The power mechanism works, transmitting power to the fixed shaft through the main shaft and the torque sensor. The fixed shaft drives the inner ring of the bearing to be tested to rotate, and the friction torque of the bearing to be tested is read in real time through the torque sensor.

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