Bearing tester

Abstract

The bearing testing machine comprises a base body, a main shaft and a bearing loading seat. The closed internal force balancing mechanism is used to apply radial force and axial force on the tested bearing. The working bearing of the testing machine main shaft only bears a small couple load, which simplifies the structural design of the testing machine main shaft (the diameter of the main shaft and the size of the working bearing are greatly reduced), reduces the torque and power of the driving device, and reduces the volume and cost of the testing machine. Moreover, the service life of the working bearing of the main shaft during the test is improved, the disassembly and replacement frequency of the working bearing of the main shaft is reduced, and the operation efficiency of the testing machine is improved.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and more particularly to bearing testing machines. Background Technology

[0002] The entire bearing development process includes iterative steps such as structural design, parameter calculation and selection, numerical simulation, sample fabrication, bench testing, and installation testing. During the bench testing phase, the testing machine applies corresponding radial forces, axial forces, and overturning moments to the bearing at specified speeds and temperatures according to the designed test procedures, conducting various performance and life tests. After the tests, the bearing undergoes physical and chemical inspection and evaluation. Typically, applying a larger load to the bearing during bench testing can shorten the test time and the bearing development cycle. However, due to the large load applied during bearing reinforcement testing (P / C > 0.3), the design dimensions of the testing machine's support spindle and bearings are large, resulting in a short spindle bearing service life and frequent bearing disassembly and replacement. The high torque and power of the spindle drive device also contribute to the large size and high cost of the testing machine, leading to high testing and operating expenses. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a bearing testing machine that is easy to operate, has a long spindle life, and is low in cost.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A bearing testing machine includes: a base; a main shaft rotatably mounted on the base, the left end of the main shaft extending out of the base and mounting two bearings to be tested, the two bearings to be tested including a left bearing to be tested and a right bearing to be tested arranged sequentially from the outside to the inside, the right end of the main shaft extending out of the base and connected to a drive device; and bearing loading seats mounted on the two bearings to be tested, including: a left bearing seat fitted on the outer ring of the left bearing to be tested, a right bearing seat fitted on the outer ring of the right bearing to be tested, a left loading seat fitted on the left bearing seat, and a right loading seat fitted on the right bearing seat;

[0006] The bearing loading seat also includes a left end cover located at the end of the left loading seat away from the right loading seat and a right end cover located at the end of the right loading seat away from the left loading seat. The left end cover, the left loading seat, the right loading seat and the right end cover are connected by a plurality of hinges arranged along the axial direction.

[0007] The bearing loading seat also includes an axial loading mechanism disposed on the left end cover. The axial loading mechanism includes multiple axial loading cylinders. One end of each axial loading cylinder is fixed on the left end cover, and the other end extends into the inner cavity of the left loading seat and abuts against the outer ring end face of the left bearing to be tested through the loading disc. The axial loading mechanism also includes a left bearing spacer located between the loading disc and the outer ring of the left bearing to be tested, and a right bearing spacer located between the right end cover and the outer ring of the right bearing to be tested.

[0008] Furthermore, multiple axial loading cylinders are evenly distributed axially on the left end cover; the loading disc is slidably sleeved in the left loading seat, the left bearing spacer is slidably sleeved in the left bearing seat, and the right bearing spacer is slidably sleeved in the right bearing seat; the piston rod of the axial loading cylinder is drivenly connected to the loading disc, and the piston rod extends to drive the loading disc to push the left bearing spacer against the outer ring end face of the left bearing to be tested.

[0009] Furthermore, the bearing assembly includes a bearing housing disposed on the base and two pairs of cylindrical roller bearings disposed between the main shaft and the bearing housing; the driving device is a drive motor, the output shaft of the drive motor is connected to the main shaft, and drives the main shaft to rotate.

[0010] Furthermore, a first gap is provided between the left bearing housing and the right bearing housing, and a second gap is provided between the left loading seat and the right loading seat.

[0011] Furthermore, an axial elastic sealing assembly is provided between the left loading seat and the right loading seat. The bearing elastic sealing assembly includes a sealing ring and a spring. The sealing ring is disposed within the second gap. A spring mounting hole is provided on the end face of the right loading seat near the left loading seat, corresponding to the sealing ring. The spring is installed in the spring mounting hole and abuts against the sealing ring.

[0012] Furthermore, both the left and right bearings to be tested are fixedly mounted on the spindle by mounting sleeves. The mounting sleeves are fixed at the shoulder of the spindle by locking nuts. The outer circumferential surface of the left end of the spindle is provided with an external thread that matches the locking nut. The outer circumferential surface of the middle part of the mounting sleeve is provided with a limiting shoulder. The two bearings to be tested are mounted back to back on both sides of the limiting shoulder on the mounting sleeve.

[0013] Furthermore, each of the hinge components includes a loading seat link, which passes sequentially through the left end cover, the left loading seat, the right loading seat, and the right end cover with a gap, and is then fastened by a fastening nut. Both ends of the loading seat link are provided with external threads that are compatible with the fastening nut. The left end cover, the left loading seat, the right loading seat, and the right end cover are coaxially provided with through holes that are compatible with the loading seat link, and the inner diameter of the through holes is larger than the diameter of the loading seat link.

[0014] Furthermore, each of the hinge components also includes a ball joint structure disposed at both ends of the loading seat connecting rod. Each ball joint structure is fastened to the through hole of the left end cover and the right end cover respectively by a fastening nut. The ball joint structure includes a ball joint sleeve and a ball joint washer. The inner wall of the ball joint sleeve is provided with a concave spherical surface. The outer wall of the ball joint washer is provided with a spherical surface that matches the concave spherical surface of the ball joint sleeve. The outer side of the through hole of the left end cover and the right end cover is provided with a mounting hole that matches the ball joint sleeve.

[0015] Furthermore, the bearing loading seat also includes a radial loading mechanism disposed on the outer peripheral surfaces of the left loading seat and the right loading seat. The radial loading mechanism includes a radial loading cylinder. Two pairs of axial protrusions are staggered at the ends of the left loading seat and the right loading seat that are close to each other, and a radial loading cylinder is disposed radially between the axial protrusions on the same side.

[0016] Furthermore, it also includes a balancing cylinder disposed at the bottom of the bearing loading seat, the balancing cylinder being used to balance the weight of the bearing loading seat and the bearing to be tested; one end of the balancing cylinder is fixed relative to the base, and the other end of the balancing cylinder is connected to a connecting lug on the outer peripheral surface of the bottom of the left end cover.

[0017] The beneficial effects of this invention compared to the prior art are:

[0018] The bearing testing machine provided by this invention includes a base, a main shaft, and a bearing loading seat. The bearing loading seat employs a closed internal force balancing mechanism to apply radial and axial forces to the bearing under test. The working bearing of the main shaft only bears a small couple load, simplifying the structural design of the main shaft (significantly reducing the diameter of the main shaft and the size of the working bearing), lowering the torque and power of the drive device, and reducing the size and cost of the testing machine. Furthermore, it increases the service life of the main shaft working bearing during testing, reduces the frequency of disassembly and replacement of the main shaft working bearing, and improves the operating efficiency of the testing machine. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0020] Figure 2This is a schematic diagram of the left-side structure according to an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of the AA-direction structure;

[0022] Figure 4 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0023] Figure 5 This is a three-dimensional structural schematic diagram of another embodiment of the present invention.

[0024] In the diagram: 1. Base, 2. Main shaft, 3. Bearing assembly, 31. Bearing housing, 32. Cylindrical roller bearing, 4. Left bearing under test, 5. Right bearing under test, 6. Drive motor, 7. Mounting sleeve, 8. Locking nut, 9. Bearing loading seat, 91. Left bearing housing, 92. Right bearing housing, 93. Left loading seat, 94. Right loading seat, 95. Left end cover, 96. Right end cover, 97. Hinge, 97a. Loading seat connecting rod, 97b. Ball joint sleeve, 97c. Ball joint washer, 97d. Fastening nut, 98. Axial loading mechanism, 98a. Axial loading cylinder, 98b. Loading disc, 98c. Left bearing spacer, 98d. Right bearing spacer, 99. Radial loading cylinder, 10. Protrusion, 11. First clearance, 12. Second clearance, 13. Sealing ring, 14. Spring, 15. Balance cylinder. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Example 1

[0027] like Figure 1-3 As shown, the bearing testing machine includes: a base 1, a main shaft 2, and a bearing loading seat 9. The base 1 is fixedly set on the ground, and the main shaft 2 is rotatably set on the base 1 via a bearing assembly 3. Specifically, the bearing assembly 3 includes a bearing seat 31 set on the base 1 and two pairs of cylindrical roller bearings 32 set between the main shaft 2 and the bearing seat 31.

[0028] In this embodiment, the left end of the spindle 2 extends out of the base 1 and is fitted with two bearings to be tested. These bearings include a left bearing 4 and a right bearing 5, arranged sequentially from the outside to the inside. The right end of the spindle 2 extends out of the base 1 and is connected to the drive device. In this embodiment, the drive device is a drive motor 6. The output shaft of the drive motor 6 is connected to the spindle 2 via a reducer, driving the spindle 2 to rotate. Preferably, the drive motor 6 can be a stepper motor, which allows for speed control, adjustable speed during rotation, and online adjustment.

[0029] In this embodiment, the left bearing to be tested 4 and the right bearing to be tested 5 are both fixedly mounted on the main shaft 2 by the mounting sleeve 7. The mounting sleeve 7 is fixed to the shoulder of the main shaft 2 by the locking nut 8. The outer peripheral surface of the left end of the main shaft 2 is provided with an external thread that matches the locking nut 8. The outer peripheral surface of the middle part of the mounting sleeve 7 is provided with a limiting shoulder. The two bearings to be tested (the left bearing to be tested and the right bearing to be tested) are mounted back to back on both sides of the limiting shoulder on the mounting sleeve 7.

[0030] The bearing loading seat 9 is mounted on two bearings to be tested and is used to apply axial and radial loads to the two bearings to be tested. It includes a left bearing seat 91 sleeved on the outer ring of the left bearing 4 to be tested, a right bearing seat 92 sleeved on the outer ring of the right bearing 5 to be tested, a left loading seat 93 sleeved on the left bearing seat 91, a right loading seat 94 sleeved on the right bearing seat 92, a left end cover 95 located at the end of the left loading seat 93 away from the right loading seat 94, and a right end cover 96 located at the end of the right loading seat 94 away from the left loading seat 93. The left end cover 95, the left loading seat 93, the right loading seat 94, and the right end cover 96 are connected by a plurality of hinges 97 arranged along the axial direction.

[0031] In this embodiment, the left end cover 95 is located on the outer left side of the main shaft 2, and the right end cover 96 is fitted onto the main shaft 2 with a clearance. A sealing ring is provided between the right end cover 96 and the main shaft 2 to improve the sealing performance of the testing machine and facilitate the testing of the bearing under test.

[0032] In this embodiment, a first gap 11 is provided between the left bearing seat 91 and the right bearing seat 92, and a second gap 12 is provided between the left loading seat 93 and the right loading seat 94. To increase sealing performance, an axial elastic sealing assembly is provided between the left loading seat 93 and the right loading seat 94. The bearing elastic sealing assembly includes a sealing ring 13 and a spring 14, with the sealing ring 13 disposed within the second gap 12. Specifically, a spring 14 mounting hole is provided on the end face of the right loading seat 94 near the left loading seat 93, corresponding to the sealing ring 13. The spring 14 is installed in the spring 14 mounting hole 1 and abuts against the sealing ring 13.

[0033] It should be noted that, considering the test condition where the bearing under test is oil-lubricated, the bearing elastic sealing assembly in this embodiment features an axial elastic sealing device designed between the left loading seat 93 and the right loading seat 94 to ensure no lubricating oil leakage from the loading mechanism when the bearing under test is oil-lubricated. Its structure is simple, its sealing performance is good, and it is beneficial for the testing of the bearing under test.

[0034] In this embodiment, four hinge components 97 are evenly distributed around the circumference. Each hinge component 97 includes a loading seat connecting rod 97a and ball joint structures at both ends of the loading seat connecting rod 97a. The loading seat connecting rod 97a passes through the left end cover 95, the left loading seat 93, the right loading seat 94, and the right end cover 96 in sequence with clearance and is then fastened by a fastening nut 97d. Both ends of the loading seat connecting rod 97a are provided with external threads that are compatible with the fastening nut 97d. The left end cover 95, the left loading seat 93, the right loading seat 94, and the right end cover 96 are coaxially provided with through holes that are compatible with the loading seat connecting rod 97a. The inner diameter of the through hole is larger than the diameter of the loading seat connecting rod 97a, thereby forming a clearance fit between the loading seat connecting rod 97a and the through hole.

[0035] In this embodiment, each ball joint structure is fastened to the through holes of the left end cap 95 and the right end cap 96 respectively by a fastening nut 97d. Specifically, the ball joint structure includes a ball joint sleeve 97b and a ball joint washer 97c. The inner wall of the ball joint sleeve 97b is provided with a concave spherical surface, and the outer wall of the ball joint washer 97c is provided with a spherical surface that matches the concave spherical surface of the ball joint sleeve 97b. The outer side of the through holes of the left end cap 95 and the right end cap 96 are provided with mounting holes that match the ball joint sleeve 97b. The inner diameter of the ball joint washer 97c matches the diameter of the loading seat connecting rod 97a. During installation, the loading seat connecting rod 97a passes through the ball joint sleeve 97b and the ball joint washer 97c and is then screwed and fixed with the fastening nut 97d.

[0036] The bearing loading seat 9 in this embodiment also includes an axial loading mechanism 98 disposed on the left end cover 95, which is used to axially load the bearing to be tested. The axial loading mechanism 98 includes a plurality of axial loading cylinders 98a. One end of each axial loading cylinder 98a is fixed on the left end cover 95, and the other end extends into the inner cavity of the left loading seat 93 and abuts against the outer ring end face of the left bearing to be tested 4 through the loading plate 98b.

[0037] To facilitate axial loading of the bearing under test and achieve closed internal force balance, the axial loading mechanism 98 also includes a left bearing spacer 98c located between the loading disk 98b and the outer ring of the left bearing under test 4, and a right bearing spacer 98d located between the right end cover 96 and the outer ring of the right bearing under test 5.

[0038] In this embodiment, multiple axial loading cylinders 98a are evenly distributed along the axial direction on the left end cover 95; the loading disk 98b is slidably sleeved in the left loading seat 93, the left bearing spacer 98c is slidably sleeved in the left bearing seat 91, and the right bearing spacer 98d is slidably sleeved in the right bearing seat 92; the piston rod of the axial loading cylinder 98a is drivenly connected to the loading disk 98b. When axially loading occurs, the piston rod extends to drive the loading disk 98b to push the left bearing spacer 98c against the outer ring end face of the left bearing to be tested 4.

[0039] It should be noted that the specifications and number of axial cylinders are designed and selected according to the magnitude and requirements of the axial load. In use, the axial loading cylinder 98a applies an axial load to the left bearing under test 4 through the floating loading plate 98b and the left bearing spacer 98c; the left end cover 95 and the left loading seat 93 are connected to the right end cover 96 and the right loading seat 94 through the loading seat connecting rod 97a. The loading seat connecting rod 97a adopts a ball joint structure and is hinged to the left end cover 95 and the right end cover 96. The axial reaction force applies an equal and opposite axial load to the right bearing under test 5 through the loading seat connecting rod 97a, the right end cover 96 and the right bearing spacer 98d. The two equal and opposite axial forces acting between the left end cover 95 and the right end cover 96 are internal forces and are balanced with each other. The axial resultant force on the main shaft 2 of the testing machine is zero. At this time, the loading seat connecting rod 97a is in a tensioned state. Therefore, the spindle 2 and the bearing assembly 3 on the spindle 2 do not bear the axial force applied to the bearing under test, thereby improving the service life of the working bearing of the spindle 2 during the test, reducing the frequency of disassembly and replacement of the working bearing of the spindle 2, and improving the operating efficiency of the testing machine; suitable axial clearances are designed between the left loading seat 93 and the right loading seat 94 and between the left bearing seat 91 and the right bearing seat 92 to ensure that there is sufficient axial displacement space between the left and right loading seats 94 and between the left and right bearing seats 92 during axial loading, thereby facilitating axial loading.

[0040] The bearing loading seat 9 in this embodiment also includes a radial loading mechanism disposed on the outer peripheral surfaces of the left loading seat 93 and the right loading seat 94, for radially loading the bearing under test. The radial loading mechanism includes a radial loading cylinder 99. Two pairs of axial protrusions 10 are staggered at the ends of the left loading seat 93 and the right loading seat 94 that are close to each other. The radial loading cylinder 99 is arranged radially between the axial protrusions 10 on the same side. One end of the radial cylinder is fixed to the axial protrusion 10 on the left loading seat, and the other end abuts against the axial protrusion 10 on the right loading seat 94.

[0041] In use, the piston rods of the two symmetrically arranged radial cylinders extend to drive the left loading seat 93 and the right loading seat 94 to misalign radially, thereby achieving radial loading on the two bearings under test. It should be noted that the radial misalignment displacement of the left loading seat 93 and the right loading seat 94 is matched with the radial movement of the loading connecting rod relative to the through holes on the left end cover 95, the left loading seat 93, the right loading seat 94, and the right end cover 96.

[0042] It should be noted that in this embodiment, two radial hydraulic cylinders arranged vertically and horizontally on both sides of the left and right loading seats apply parallel radial forces to the left and right bearings to be tested through the left and right loading seats and the left and right bearing seats. The two equal and opposite radial forces act between the left and right bearing seats, are equal in magnitude and opposite in direction, and are radially balanced. The resultant force on the main shaft 2 and the bearing assembly 3 on the main shaft 2 is zero. Therefore, the main shaft 2 and the bearing assembly 3 on the main shaft 2 do not bear the radial force applied to the bearings to be tested by the radial loading cylinder 99, but only bear a small torque. The two equal and opposite radial forces are not collinear, but the distance between the axes of force action is short. Therefore, the torque on the main shaft 2 of the testing machine is small.

[0043] In addition, in this embodiment, the left loading seat 93 is connected to the right loading seat 94 via the loading seat connecting rod 97a to form a parallel four-bar linkage structure, with a ball joint connection at the mating surface. Appropriate axial clearances are designed between the two loading seats and the two bearing seats 31. Therefore, when the radial cylinder applies radial force, this parallel four-bar linkage mechanism can ensure that the left and right loading seats and the left and right bearing seats move radially (vertically) in parallel without constraint, friction, or interference, achieving accurate, reliable, and parallel radial loading.

[0044] This embodiment also includes two balancing cylinders 15 disposed at the bottom of the bearing loading seat 9. The balancing cylinders 15 are used to balance the weight of the bearing loading seat and the bearing to be tested. The two balancing cylinders are symmetrically arranged. One end of the balancing cylinder 15 is fixed relative to the base 1, and the other end of the balancing cylinder 15 is connected to the connecting lug on the bottom outer peripheral surface of the left end cover 95 through a hinge.

[0045] It should be noted that a balance cylinder 15 is installed at the bottom of the bearing loading seat 9. By adjusting the pressure of the hydraulic system, the balance cylinder 15 outputs a corresponding upward thrust to balance the weight of the bearings to be tested and the bearing loading seats of different specifications, so that the spindle 2 of the testing machine does not bear the weight of the bearings to be tested and the bearing loading seat 9. In addition, the balance cylinder 15 can also prevent the circumferential oscillation of the bearing loading seat 9 when the spindle 2 rotates, which is beneficial to the operation and testing of the testing machine and improves the accuracy of the test.

[0046] The beneficial effects of this embodiment compared to the prior art are:

[0047] In this embodiment, the bearing loading seat employs a closed internal force balancing mechanism to apply radial and axial forces to the bearing under test. Simultaneously, a balancing cylinder is located at the bottom of the bearing loading seat to balance the weight of the testing fixture and the bearing under test. Therefore, the working bearing of the testing machine spindle only bears a relatively small torque load, simplifying the structural design of the testing spindle (significantly reducing the diameter of the spindle and the size of the working bearing), reducing the torque and power of the drive device, decreasing the size and cost of the testing machine, and increasing the service life of the spindle working bearing during testing. This also reduces the frequency of disassembly and replacement of the spindle working bearing, thereby improving the operating efficiency of the testing machine.

[0048] It should be noted that the parts of this invention not described in detail are prior art.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "joining," "fixing," and "screw-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] In the description of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] Although embodiments of the present invention have been shown and described above, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bearing tester characterized by: The utility model relates to a bearing loading seat, which comprises a base, a main shaft rotatably arranged on the base through a bearing assembly, a left end of the main shaft extending out of the base and being provided with two bearings to be measured, the two bearings to be measured comprising a left bearing to be measured and a right bearing to be measured arranged in sequence from outside to inside, a right end of the main shaft extending out of the base and being connected with a driving device, and an axial loading mechanism arranged on the left end cover of the bearing loading seat, the axial loading mechanism comprising a plurality of axial loading oil cylinders, one end of each of the axial loading oil cylinders being fixed on the left end cover, the other end of each of the axial loading oil cylinders being arranged in a left loading seat inner cavity and being abutted against an outer ring end face of the left bearing to be measured through a loading disc, the axial loading mechanism further comprising a left bearing spacer between the loading disc and the outer ring of the left bearing to be measured and a right bearing spacer between the right end cover and the outer ring of the right bearing to be measured. The driving device is a driving motor. The bearing loading seat further comprises a left end cover arranged at an end of the left loading seat away from the right loading seat and a right end cover arranged at an end of the right loading seat away from the left loading seat, and the left end cover, the left loading seat, the right loading seat, and the right end cover are connected through a plurality of hinge members arranged in an axial direction. The driving device is a driving motor. The bearing loading seat further comprises a balance oil cylinder arranged at a bottom of the bearing loading seat, the balance oil cylinder being used for balancing a weight of the bearing loading seat and the bearings to be measured, one end of the balance oil cylinder being fixed relative to the base, and the other end of the balance oil cylinder being connected with a connecting lug on an outer peripheral surface of a bottom of the left end cover. A plurality of the axial loading oil cylinders are uniformly distributed on the left end cover in an axial direction, the loading disc is slidably sleeved in the left loading seat, the left bearing spacer is slidably sleeved in the left bearing seat, and the right bearing spacer is slidably sleeved in the right bearing seat; a piston rod of the axial loading oil cylinder is drivingly connected with the loading disc, the piston rod extends out of the driving loading disc to push the left bearing spacer to abut against an outer ring end face of the left bearing to be measured. The bearing assembly comprises a bearing seat arranged on the base and two pairs of cylindrical roller bearings arranged between the main shaft and the bearing seat; an output shaft of the driving motor is connected with the main shaft to drive the main shaft to rotate.

2. The bearing tester of claim 1, wherein: A first gap is arranged between the left bearing seat and the right bearing seat, and a second gap is arranged between the left loading seat and the right loading seat.

3. The bearing tester of claim 1, wherein: An axial elastic sealing assembly is arranged between the left loading seat and the right loading seat, the axial elastic sealing assembly comprising a sealing ring and a spring, the sealing ring being arranged in the second gap, the right loading seat being provided with a spring mounting hole corresponding to the sealing ring on an end face of an end of the right loading seat close to the left loading seat, and the spring being arranged in the spring mounting hole and abutting against the sealing ring.

4. The bearing tester of claim 1, wherein: ​ 5. The bearing tester of claim 4, wherein: ​ 6. The bearing tester of claim 1, wherein: The left and right bearing to be tested are fixedly installed on the main shaft through mounting sleeves, the mounting sleeves are fixed at the shaft shoulder of the main shaft through locking nuts, the outer periphery of the left end of the main shaft is provided with external threads matched with the locking nuts, and the outer periphery of the middle part of the mounting sleeve is provided with a limiting shaft shoulder.

7. The bearing tester of claim 1, wherein: Each of the articulated members comprises a loading seat connecting rod, the loading seat connecting rod is sequentially and gapingly arranged through the left end cover, the left loading seat, the right loading seat and the right end cover, and is fastened through a fastening nut, both ends of the loading seat connecting rod are provided with external threads matched with the fastening nut, the left end cover, the left loading seat, the right loading seat and the right end cover are coaxially provided with through holes matched with the loading seat connecting rod, and the inner diameter of the through holes is greater than the diameter of the loading seat connecting rod.

8. The bearing tester of claim 7, wherein: Each of the articulated members further comprises a spherical hinge structure arranged at both ends of the loading seat connecting rod, each spherical hinge structure is fastened to the through holes of the left end cover and the right end cover through a fastening nut, the spherical hinge structure comprises a spherical hinge sleeve and a spherical hinge gasket, the inner wall of the spherical hinge sleeve is provided with an inner concave spherical surface, the outer wall of the spherical hinge gasket is provided with a spherical surface matched with the inner concave spherical surface of the spherical hinge sleeve, and the outer side of the through holes of the left end cover and the right end cover is provided with a mounting hole matched with the spherical hinge sleeve.

9. The bearing tester of claim 1, wherein: The bearing loading seat further comprises a radial loading mechanism arranged on the outer periphery of the left loading seat and the right loading seat, the radial loading mechanism comprises radial loading oil cylinders, and the ends of the left loading seat and the right loading seat close to each other are staggered arranged with two pairs of axial protrusions, and the radial loading oil cylinders are arranged between the axial protrusions on the same side in the radial direction.

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