Fixture for bearing test, testing machine and bearing test method

Abstract

The present disclosure relates to a fixture for bearing testing, a testing machine and a bearing testing method, wherein the fixture for bearing testing is used to install a bearing group, the bearing group includes a first bearing and a second bearing, and the fixture for bearing testing includes: a shell, which is a hollow cavity structure, with a first through hole and a second through hole on both sides thereof; a core shaft, which is located in the shell, and the two ends of the core shaft are respectively installed on the shell through the first bearing and the second bearing, the first end of the core shaft passes through the first through hole and is used to connect an axial loading mechanism, a positioning portion is provided on the outer wall of the core shaft, and the positioning portion abuts between the first bearing and the second bearing; a first limit member, which is configured to limit the first bearing from moving axially in a direction away from the positioning portion; a second limit member, which is configured to limit the second bearing from moving axially in a direction away from the positioning portion; and an adjustment pad, which can be optionally provided between the second bearing and the second limit member, and is configured to adjust the installation clearance of the bearing group.

Description

Technical Field

[0001] The present disclosure relates to the field of bearing testing, and in particular to a bearing testing fixture, a testing machine, and a bearing testing method. Background Art

[0002] The enhanced life test is a commonly used test analysis and verification method for rolling bearings. It can greatly shorten test time, save test costs, and improve test efficiency. When conducting the bearing enhanced life test, the tested bearing needs to be mounted on a dedicated fixture to facilitate the application of load to the tested bearing.

[0003] Installation clearance is a key factor affecting the service life of rolling bearings. Excessive installation clearance reduces the effective contact area between the bearing rolling elements and rings during operation, resulting in reduced bearing rotational accuracy and stiffness, and a shortened service life. Excessive installation clearance increases internal friction, heat generation, and wear, shortening service life. Therefore, selecting the appropriate installation clearance is crucial for extending the service life of rolling bearings. For split rolling bearings (such as tapered roller bearings), clearance control relies entirely on assembly, and the selection of installation clearance is the most critical step.

[0004] However, existing fixtures for rolling bearing life testing cannot control the installation clearance of the bearing group and do not have the ability to test fixed installation clearance. As a result, the application scope and functions of the testing machine are limited, and it cannot provide support for the selection of installation clearance of rolling bearings (especially tapered roller bearings) and the development and verification of assembly processes. Summary of the Invention

[0005] The embodiments of the present disclosure provide a bearing test fixture, a testing machine, and a bearing test method, which can control the installation clearance of a bearing group.

[0006] According to a first aspect of the present disclosure, a bearing test fixture is provided for mounting a bearing set, the bearing set including a first bearing and a second bearing. The bearing test fixture includes:

[0007] The shell is a hollow cavity structure with a first through hole and a second through hole on both sides thereof;

[0008] A core shaft is located in the housing, and both ends of the core shaft are respectively mounted on the housing through a first bearing and a second bearing, the first end of the core shaft passes through the first through hole and is used to connect to the axial loading mechanism, the second end of the core shaft passes through the second through hole and is used to connect to the drive shaft, and a positioning portion is provided on the outer wall of the core shaft, and the positioning portion abuts between the first bearing and the second bearing;

[0009] The first limiting member includes an axial limiting portion connected to the housing and configured to limit the first bearing from moving axially in a direction away from the positioning portion;

[0010] a second limiting member configured to limit the second bearing from moving axially in a direction away from the positioning portion; and

[0011] The adjusting pad is optionally provided between the second bearing and the second stopper and is configured to adjust the installation clearance of the bearing assembly.

[0012] In some embodiments, the first limiting member further includes a radial limiting portion, which is provided between the first bearing and the housing and is configured to radially limit the first bearing;

[0013] The bearing test fixture further includes: a third limiting member, which is provided between the second bearing and the housing and is configured to radially limit the second bearing.

[0014] In some embodiments, the bearing test fixture further comprises:

[0015] The first loading assembly is disposed outside the housing and is configured to rotatably connect the first end of the core shaft to the axial loading mechanism to transmit the axial load output by the axial loading mechanism to the bearing group.

[0016] In some embodiments, the first loading assembly includes a first loading member and a first auxiliary bearing, the first loading member is used to receive the axial load applied by the axial loading mechanism, and the first auxiliary bearing is connected between the first loading member and the first end of the core shaft.

[0017] In some embodiments, the first loading assembly further includes a connector connected between the first auxiliary bearing and the first end of the core shaft;

[0018] Wherein, a mounting hole is provided on the end surface of the connecting piece close to the core shaft, and the first end of the core shaft is embedded in the mounting hole to limit the core shaft from rotating in the circumferential direction.

[0019] In some embodiments, the bearing test fixture further comprises:

[0020] a second loading assembly disposed in the housing and connected to the core shaft, configured to transmit the radial load output by the radial loading mechanism to the bearing assembly;

[0021] Wherein, a third through hole for connecting the second loading assembly and the radial loading mechanism is provided on the shell.

[0022] In some embodiments, the second loading assembly includes a second loading member and a second auxiliary bearing, the second loading member is used to receive the radial load applied by the radial loading mechanism, and the second auxiliary bearing is connected between the second loading member and the core shaft.

[0023] In some embodiments, the positioning portion includes a flange provided on the outer wall of the core shaft, a first positioning member and a second positioning member provided outside the core shaft, the flange is provided at the first end of the core shaft, the first bearing rests against the side of the flange away from the first positioning member, the first positioning member rests between the flange and the second auxiliary bearing, and the second positioning member rests between the second auxiliary bearing and the second bearing.

[0024] According to a second aspect of the present disclosure, a testing machine is provided, comprising:

[0025] The bearing test fixture of the above embodiment;

[0026] a drive shaft connected to the second end of the mandrel and configured to drive the mandrel to rotate; and

[0027] The axial loading mechanism is configured to apply an axial load to the bearing set through the first end of the core shaft.

[0028] In some embodiments, the bearing testing fixture further includes a second loading assembly disposed within the housing and connected to the core shaft, and the testing machine further includes:

[0029] The radial loading mechanism is configured to apply a radial load to the bearing set through the second loading assembly.

[0030] According to a third aspect of the present disclosure, a bearing testing method based on the testing machine of the above embodiment is proposed, comprising:

[0031] Assemble the first bearing and the second bearing to both sides of the positioning portion on the core shaft respectively;

[0032] Install the first bearing, the first limiter and the second bearing on the housing so that the bearing assembly and the housing are assembled into one;

[0033] Calculate the thickness t of the adjusting pad according to the required installation clearance of the bearing group;

[0034] Install an adjustment washer with a thickness of t axially between the outer ring of the second bearing and the second stopper, and fix the second stopper and the housing;

[0035] Install the first loading assembly on the first end of the core shaft to complete the assembly of the bearing test fixture, and then assemble the bearing test fixture as a whole into the testing machine.

[0036] In some embodiments, the first limiting member further includes a radial limiting portion, the bearing test fixture further includes a third limiting member, and installing the first bearing, the first limiting member, and the second bearing on the housing so that the bearing assembly and the housing are assembled as one body further includes:

[0037] The first bearing, the first limiting member, the third limiting member and the second bearing are installed on the housing so that the bearing group and the housing are assembled into one body.

[0038] In some embodiments, the method for calculating the thickness t of the adjustment pad according to the required installation clearance of the bearing set includes:

[0039] The thickness t of the adjustment pad is calculated according to the installation clearance required by the bearing group, the distance between the second bearing and the third limiting member, and the size of the second limiting member.

[0040] In some embodiments, the first loading assembly includes a first loading member, a first auxiliary bearing, and a connecting member, and before the first loading assembly is mounted on the first end of the core shaft, the first loading assembly further includes:

[0041] The first loading member, the first auxiliary bearing and the connecting member are assembled into one body.

[0042] In some embodiments, the bearing test fixture further includes a second loading assembly, the second loading assembly includes a second loading member and a second auxiliary bearing, the positioning portion includes a first positioning member, a second positioning member and a flange, and the two sides of the positioning portion for assembling the first bearing and the second bearing onto the core shaft include:

[0043] The assembled first bearing, flange, first positioning member, second auxiliary bearing, second positioning member and second bearing are arranged in sequence along the axial direction.

[0044] In some embodiments, after the bearing test fixture is assembled into the testing machine, the method further includes:

[0045] Connecting the first loading assembly to the axial loading mechanism of the testing machine; and / or

[0046] Connect the second loading assembly to the radial loading mechanism of the testing machine.

[0047] In some embodiments, the bearing testing method further comprises:

[0048] After the test is completed, the bearing test fixture is removed from the testing machine, the test results are analyzed, and the adjustment pads of different thicknesses are replaced or the bearing groups of different sizes are replaced before continuing with the next set of tests.

[0049] Based on the above technical solution, the bearing test fixture of the disclosed embodiment can be quickly assembled, is easy to use, simple to operate, and has low processing cost. It can accurately control the installation clearance of the tested bearing group to ensure the accuracy and effectiveness of the test results. It has the ability to perform bearing enhanced life tests under fixed installation clearance conditions, can quickly analyze the impact of bearing installation clearance and quickly verify the rationality of the assembly process through enhanced life tests, and can provide strong support for the selection and verification of bearing installation clearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0051] Figure 1 Schematic diagram of the structure of some embodiments of the bearing test fixture disclosed in the present invention.

[0052] Figure 2 Schematic diagram of the structure of some embodiments of the housing of the bearing test fixture disclosed in the present invention.

[0053] Figure 3 Schematic diagram of the structure of some embodiments of the core shaft of the bearing test fixture disclosed in the present invention.

[0054] Figure 4 Schematic diagram of the structure of some embodiments of the second limit member of the bearing test fixture disclosed in the present invention.

[0055] Figure 5 Schematic diagram of the structure of some embodiments of the third limit member of the bearing test fixture disclosed in the present invention.

[0056] Figure 6 Schematic diagram of the structure of some embodiments of the first loading member of the bearing test fixture disclosed in the present invention.

[0057] Figure 7 Schematic diagram of the structure of some embodiments of the connector of the bearing test fixture disclosed in the present invention.

[0058] Figure 8 Schematic diagram of the structure of some embodiments of the second loading member of the bearing test fixture disclosed in the present invention.

[0059] Figure 9 Schematic diagram of some embodiments of the bearing test fixture disclosed herein for calculating the relevant structural dimensions of the thickness t of the adjustment pad.

[0060] Figure 10 Schematic diagram of the structure of some embodiments of the testing machine disclosed herein.

[0061] Description of Reference Numerals

[0062] 1. Housing; 11. First through hole; 12. Second through hole; 13. Third through hole; 100. Piston rod; 101. Axial loading mechanism; 102. Radial loading mechanism; 2. Core shaft; 21. Positioning portion; 211. First positioning member; 212. Second positioning member; 213. Flange; 3. First limiting member; 31. Axial limiting member; 32. Radial limiting member; 4. Second limiting member; 5. Adjusting pad; 6. Bearing group; 61. First bearing; 62. Second bearing; 7. Third limiting member; 8. First loading assembly; 81. First loading member; 82. First auxiliary bearing; 83. Connecting member; 831. Mounting hole; 9. Second loading assembly; 91. Second loading member; 92. Second auxiliary bearing. DETAILED DESCRIPTION

[0063] The present disclosure is described in detail below. In the following paragraphs, various aspects of the embodiments are defined in more detail. Each aspect defined in this manner may be combined with any other aspect or aspects unless expressly stated not to be combinable. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

[0064] The terms "first", "second", "third", etc. appearing in this disclosure are only for the convenience of description to distinguish different components with the same name, and do not indicate a priority or primary and secondary relationship.

[0065] In the description of the present disclosure, it should be understood that the terms "upper", "lower", "inside" or "outside" and the like indicate orientations or positional relationships that are defined based on the shell, core shaft, base, etc., and are only used to facilitate the description of the present disclosure, and do not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the scope of protection of the present disclosure.

[0066] The present disclosure provides a fixture for bearing testing, such as Figures 1 to 4 As shown, it is used to install the bearing group 6, which includes a first bearing 61 and a second bearing 62. The fixture for bearing testing includes:

[0067] The housing 1 is a hollow cavity structure with a first through hole 11 and a second through hole 12 on both sides thereof;

[0068] The core shaft 2 is located in the housing 1, and its two ends are respectively mounted on the housing 1 via a first bearing 61 and a second bearing 62. The first end of the core shaft 2 passes through the first through hole 11 and is used to connect to the axial loading mechanism 101. The second end of the core shaft 2 passes through the second through hole 12 and is used to connect to the drive shaft. A positioning portion 21 is provided on the outer wall of the core shaft 2, and the positioning portion 21 abuts between the first bearing 61 and the second bearing 62.

[0069] The first limiting member 3 includes an axial limiting portion 31 , which is connected to the housing 1 and is configured to limit the first bearing 61 from moving axially in a direction away from the positioning portion 21 ;

[0070] A second limiting member 4 is configured to limit the second bearing 62 from moving axially in a direction away from the positioning portion 21; and

[0071] The adjustment pad 5 , which may be optionally disposed between the second bearing 62 and the second stopper 4 , is configured to adjust the installation clearance of the bearing assembly 6 .

[0072] Optionally, the first through hole 11 and the second through hole 12 can be of any shape, and can be circular or square, etc. For example, at least one of the first through hole 11 and the second through hole 12 is a circular countersunk hole to facilitate the installation of the limiter. Specifically, the connection between the bearing group 6 and the core shaft 2 is an interference fit. Optionally, the axial limit portion 31 of the first limiter 3 and the second limiter 4 can be detachably connected to the housing 1 by bolts. Specifically, according to the requirements of the installation clearance of the bearing group 6, an adjustment pad 5 can be provided or not. In the case of providing the adjustment pad 5, the thickness and size of the adjustment pad 5 can be adjusted according to actual needs. More specifically, the adjustment pad 5 is provided between the outer ring of the second bearing 62 and the second limiter 4. Optionally, there is no limitation on the cross-sectional form of the adjustment pad 5, and it can be continuous and uninterrupted along the circumference, or it can be hollow.

[0073] Specifically, due to the influence of dimensional processing deviations of the core shaft 2, the positioning part 21, the first limit member 3 and the second limit member 4, the installation clearance of the assembled tested bearing group 6 will be different from the theoretical value. It is difficult and costly to accurately control the installation clearance by improving the processing accuracy of each component. By selectively placing an adjustment pad 5 of appropriate thickness between the second limit member 4 and the second bearing 62, it is possible to achieve fine control of the installation clearance, reduce the processing accuracy and processing cost of the tooling parts, and facilitate operation.

[0074] Specifically, the axial loading mechanism 101 is configured to apply an axial load to the bearing assembly 6, for example, to perform a loading test on the bearing assembly 6 under specific installation clearance conditions. Specifically, the second end of the core shaft 2 can be connected to a drive shaft using a keyway or other structure. Specifically, the drive shaft is configured to rotate the core shaft 2, on which the bearing assembly 6 is mounted. More specifically, the drive shaft can drive the inner ring of the bearing assembly 6 to rotate. Specifically, the axial stop 31 of the first stopper 3 and the second stopper 4 both constrain the outer ring of the bearing assembly 6, ensuring the axial position of the bearing assembly 6 remains stable during the test.

[0075] Specifically, the positioning portion 21 positions the inner ring of the bearing assembly and can limit the axial movement of the first bearing 61 and the second bearing 62 toward the positioning portion 21. Optionally, the positioning portion 21 can be an integral structure or a split structure, and can be fixedly connected to the core shaft 2, for example, formed integrally with the core shaft 2, or can be detachably connected to the core shaft 2, for example, the positioning portion 21 is a spacer sleeve mounted on the core shaft 2. The positioning portion 21 can also be partially fixedly connected to the core shaft 2 and partially detachably connected to the core shaft 2, for example, the positioning portion 21 is a combination of a flange and a spacer sleeve.

[0076] Specifically, the first end of the core shaft 2 is connected to the axial loading mechanism 101, so that the core shaft 2 transmits the axial load applied by the axial loading mechanism 101 to the bearing assembly 6. More specifically, the core shaft 2 can transmit the axial load applied by the axial loading mechanism 101 to the inner ring of the bearing assembly 6. For example, under the axial force applied by the axial loading mechanism 101, the inner rings of the first bearing 61 and the second bearing 62 move to one side simultaneously with the core shaft 2, while the outer rings of the first bearing 61 and the second bearing 62 are fixed relative to the housing 1, thereby ensuring a constant overall installation clearance of the bearing assembly 6.

[0077] Specifically, because the bearing test fixture is structurally symmetrical, the first bearing 61 and the second bearing 62 can be installed on either side of the housing 1. For example, the first bearing 61 can be located on either the first end of the core shaft 2 or the second end of the core shaft 2. This arrangement facilitates assembly. Specifically, after the bearing test fixture is assembled, it can be installed as a whole on the testing machine.

[0078] In actual operating conditions, the axial force acting on a bearing is generally caused by the meshing action between a gear mounted on the shaft and an adjacent gear. Typically, the gear is mounted in the middle of the shaft, and the bearings are mounted at both ends. The axial force generated by the meshing gears is transmitted through the shaft to the inner ring of the bearing. Regardless of the effects of thermal expansion and contraction, the clearance reserved during bearing installation always exists during this process. This bearing test fixture can more realistically simulate the actual operating conditions of the bearing in the product, ensuring more accurate and reliable test results.

[0079] The bearing test fixture of this embodiment has an installation clearance control function, which can be used to explore the influence of installation clearance on the service life of the bearing group through experiments, guide the scientific selection of the installation clearance of the bearing group, and thus improve the service life of the bearing group; at the same time, it can also broaden the functions and application scope of the enhanced life testing machine, so that the testing machine can not only be used for comparative tests of bearings of different brands and batches, but also for the development and verification of bearing assembly processes.

[0080] The bearing test fixture of this embodiment can be quickly assembled, is easy to use, simple to operate, and has low processing costs. It can accurately control the installation clearance of the tested bearing group to ensure the accuracy and effectiveness of the test results. It has the ability to perform bearing enhancement life tests under fixed installation clearance conditions, and can provide support for the selection and verification of bearing installation clearance, making it possible to quickly analyze the impact of bearing installation clearance and quickly verify the rationality of the assembly process through enhanced life tests.

[0081] In some embodiments, as Figure 1 and Figure 5 As shown, the first limiting member 3 further includes a radial limiting portion 32, which is provided between the first bearing 61 and the housing 1 and is configured to radially limit the first bearing 61;

[0082] The bearing test fixture further includes: a third limiting member 7 , which is provided between the second bearing 62 and the housing 1 and is configured to limit the second bearing 62 in radial direction.

[0083] Specifically, the sizes of the first through hole 11 and the second through hole 12 are larger than the radial size of the bearing assembly 6. More specifically, the sizes of the first through hole 11 and the second through hole 12 are larger than the outer diameter of the bearing assembly 6. Specifically, by replacing radial stoppers 32 of different sizes, it is possible to test first bearings 61 of different sizes, and by replacing third stoppers 7 of different sizes, it is possible to test second bearings 62 of different sizes.

[0084] Specifically, by replacing radial limiting portions 32 or first limiting members 3 of different sizes, first bearings 61 of different sizes can share the same housing 1. By replacing third limiting members 7 of different sizes, second bearings 62 of different sizes can share the same housing 1. For example, when there is only one housing 1, the smooth progress of optimization tests or comparative tests of bearing groups of different sizes can be effectively guaranteed, which can improve the universality of the tooling fixtures used for bearing tests and save test costs.

[0085] The bearing test fixture of this embodiment radially limits the first bearing 61 by the radial limiting portion 32, and radially limits the second bearing 62 by the third limiting member 7. Without replacing the housing 1, it is possible to install bearing groups of different sizes by replacing only some small parts with simple structure and low cost. There is no need to replace large-sized parts with complex structure such as the housing 1, which is conducive to improving the universality of the bearing test fixture, ensuring the accuracy and effectiveness of the test results, reducing the test cost, and improving the economy.

[0086] In some embodiments, as Figures 1 to 7 As shown, the bearing test fixture also includes:

[0087] The first loading assembly 8 is disposed outside the housing 1 and is configured to rotatably connect the first end of the core shaft 2 to the axial loading mechanism 101 to transmit the axial load output by the axial loading mechanism 101 to the bearing assembly 6 .

[0088] Specifically, the first loading assembly 8 and the core shaft 2 cooperate to transmit the axial load output by the axial loading mechanism 101 to the tested bearing group 6. Optionally, the first loading assembly 8 may include only a loading bushing, or may include other structures or components that reduce friction.

[0089] This embodiment, by setting a first loading assembly 8 between the core shaft 2 and the axial loading mechanism 101, can achieve smooth and efficient transmission of axial loading force between relatively rotating parts, improve the test effect of the axial loading test on the tested bearing group, and ensure the accuracy and effectiveness of the test results.

[0090] In some embodiments, as Figures 1 to 10 As shown, the first loading assembly 8 includes a first loading member 81 and a first auxiliary bearing 82 . The first loading member 81 is used to receive the axial load applied by the axial loading mechanism 101 . The first auxiliary bearing 82 is connected between the first loading member 81 and the first end of the core shaft 2 .

[0091] Specifically, the first loading member 81, the first auxiliary bearing 82, and the mandrel 2 cooperate to transmit the axial load output by the axial loading mechanism 101 to the bearing assembly 6 under test. Specifically, the inner ring of the first auxiliary bearing 82 is directly mounted on the first end of the mandrel 2, employing an interference fit therewith. Alternatively, the first loading member 81 may be a force-transmitting component such as a loading bushing. Optionally, a recess may be defined within the first loading member 81 for mounting the first auxiliary bearing 82.

[0092] The first auxiliary bearing 82 of this embodiment can transfer the axial load on the fixed first loading member 81 to the rotating core shaft 2, which can effectively reduce friction resistance, realize smooth and efficient transmission of axial loading force between relatively rotating parts, and ensure the accuracy and effectiveness of the test results.

[0093] In some embodiments, as Figure 1 and Figure 7 As shown, the first loading assembly 8 further includes a connecting member 83 connected between the first auxiliary bearing 82 and the first end of the core shaft 2;

[0094] The end surface of the connecting member 83 close to the core shaft 2 is provided with a mounting hole 831 , and the first end of the core shaft 2 is embedded in the mounting hole 831 to limit the core shaft 2 from rotating in the circumferential direction.

[0095] Specifically, the connecting member 83 can transfer the axial load transmitted from the first auxiliary bearing 82 to the core shaft 2. More specifically, the first loading member 81, the first auxiliary bearing 82, the connecting member 83 and the core shaft 2 cooperate to transfer the axial load output by the axial loading mechanism 101 to the bearing group 6 under test.

[0096] Optionally, the mounting hole 831 may be an arbitrary polygonal notch. For example, the mounting hole 831 may be a square notch. Correspondingly, the first end of the core shaft 2 may be embedded in the mounting hole 831 of the connector 83 through a square columnar structure.

[0097] The shaft and bearing typically have an interference fit, making installation and removal relatively difficult. Without connector 83, the inner ring of first auxiliary bearing 82 would be mounted directly on core shaft 2. Each test would require installation and removal of the inner and outer rings of first auxiliary bearing 82, increasing the workload and difficulty before and after the test.

[0098] This embodiment provides a connecting member 83 between the first auxiliary bearing 82 and the first end of the core shaft 2, which can ensure that the axial loading force can be stably transmitted to the core shaft 2 when the core shaft 2 rotates, thereby ensuring the accuracy and effectiveness of the test results, and can reduce the difficulty of installing and disassembling the first loading assembly 8.

[0099] In some embodiments, as Figure 1 As shown, the bearing test fixture also includes:

[0100] The second loading assembly 9 is disposed in the housing 1 and connected to the core shaft 2 , and is configured to transmit the radial load output by the radial loading mechanism 102 to the bearing assembly 6 ;

[0101] The housing 1 is provided with a third through hole 13 for connecting the second loading assembly 9 and the radial loading mechanism 102 .

[0102] Specifically, the second loading assembly 9 and the core shaft 2 cooperate to transmit the radial load output by the radial loading mechanism 102 to the tested bearing assembly 6. Specifically, the structure of the second loading assembly 9 should match that of the positioning portion 21. Alternatively, the second loading assembly 9 may include only a loading bushing or other friction-reducing structures or components. Alternatively, the second loading assembly 9 may completely or partially surround the core shaft 2 circumferentially.

[0103] Optionally, the size of the first through hole 11 and the second through hole 12 can be larger than the maximum outer dimension of the second loading assembly 9 to assemble the bearing test fixture, or other openings or through holes with sizes larger than the maximum outer dimension of the second loading assembly 9 can be opened on the shell 1, for example, the size of the third through hole 13 is larger than the maximum outer dimension of the second loading assembly 9 to assemble the bearing test fixture.

[0104] This embodiment provides a second loading assembly 9 between the core shaft 2 and the radial loading mechanism 102, thereby enabling both axial loading tests and radial loading tests to be performed on the bearing group under test at the same time, and enabling smooth and efficient transmission of radial loading force between relatively rotating parts, thereby ensuring the accuracy and validity of the test results.

[0105] In some embodiments, as Figures 1 to 10 As shown, the second loading assembly 9 includes a second loading member 91 and a second auxiliary bearing 92 . The second loading member 91 is used to receive the radial load applied by the radial loading mechanism 102 . The second auxiliary bearing 92 is connected between the second loading member 91 and the core shaft 2 .

[0106] Specifically, the second loading member 91, the second auxiliary bearing 92 and the core shaft 2 cooperate to transmit the radial load output by the radial loading mechanism 102 to the bearing group 6 under test. Specifically, the inner ring of the second auxiliary bearing 92 is directly installed in the middle of the core shaft 2 and can be interference fit with the middle of the core shaft 2. Optionally, as Figure 8 As shown, the second loading member 91 can be a force transmission component such as a loading bushing with a flat side surface to ensure the stability of the connection with the radial loading mechanism 102. Optionally, an annular groove can be formed on the inner side of the second loading member 91 for mounting the outer ring of the second auxiliary bearing 92.

[0107] The second auxiliary bearing 92 of this embodiment can transfer the radial load on the second loading member 91 that does not rotate around the axis to the rotating core shaft 2, which can effectively reduce friction resistance and achieve smooth and efficient transmission of radial loading force between relatively rotating parts, thereby ensuring the accuracy and effectiveness of the test results.

[0108] In some embodiments, as Figures 1 to 9 As shown, the positioning portion 21 includes a flange 213 provided on the outer wall of the core shaft 2, a first positioning member 211 and a second positioning member 212 which are sleeved on the outside of the core shaft 2. The flange 213 is provided at the first end of the core shaft 2, and the first bearing 61 abuts against the side of the flange 213 away from the first positioning member 211. The first positioning member 211 abuts between the flange 213 and the second auxiliary bearing 92, and the second positioning member 212 abuts between the second auxiliary bearing 92 and the second bearing 62.

[0109] Specifically, the flange 213 is used to axially limit the first bearing 61 and the first positioning member 211. More specifically, the flange 213 axially limits the inner ring of the first bearing 61. Optionally, the flange 213 can be integrally formed with the core shaft 2, or the flange 213 can be fixed to the first end of the core shaft 2 in any manner.

[0110] Optionally, both the first positioning member 211 and the second positioning member 212 can be sleeve structures. Specifically, the first positioning member 211 is used to position the inner ring of the second auxiliary bearing 92 , and the second positioning member 212 is used to position the inner ring of the second bearing 62 .

[0111] This embodiment uses the flange 213 as a fixed point for axial positioning along the core shaft 2, and uses the first positioning member 211 and the second positioning member 212 to axially position the second auxiliary bearing 92 and the second bearing 62, so that the positioning portion 21 is matched with the second loading assembly 9, and the first bearing 61 and the second bearing 62 are accurately positioned, which can ensure that the relative position of the inner ring of the bearing group on the core shaft is always fixed, and the axial position of the bearing group is stable during the test, thereby ensuring the accuracy and effectiveness of the test.

[0112] Secondly, if Figure 1 and Figure 10 As shown, the present disclosure provides a testing machine, comprising:

[0113] The bearing test fixture of the above embodiment;

[0114] a drive shaft connected to the second end of the core shaft 2 and configured to drive the core shaft 2 to rotate; and

[0115] The axial loading mechanism 101 is configured to apply an axial load to the bearing assembly 6 through the first end of the core shaft 2 .

[0116] Optionally, the testing machine may also include a fixture seat, within which a bearing testing fixture is mounted. Specifically, the axial loading mechanism 101 on the testing machine is fixed to the outside of the bearing testing fixture and may include a loading cylinder and piston rod 100. Optionally, the testing machine is used for bearing assembly reinforcement life testing.

[0117] More specifically, the first end of the core shaft 2 is connected to the piston rod head of the loading cylinder. When an axial load needs to be applied during the test, the extension amount of the cylinder piston rod 100 is controlled to control the axial loading force acting on the core shaft 2, and then control the axial loading force acting on the bearing group 6.

[0118] The testing machine of this embodiment has the ability to perform bearing intensive life tests under fixed installation clearance conditions. It can be used to test and explore the influence of installation clearance on the service life of the bearing group, making it possible to quickly analyze the influence of bearing installation clearance and quickly verify the rationality of the assembly process through enhanced life tests. It can guide the scientific selection of bearing group installation clearance and thus improve the service life of the bearing group. At the same time, the function and application scope of the testing machine have been broadened. It can not only be used for comparative tests of bearings of different brands and batches, but also for the development and verification of bearing assembly processes.

[0119] In some embodiments, as Figure 1 and Figure 10 As shown, the bearing test fixture further includes a second loading assembly 9, which is disposed in the housing 1 and connected to the core shaft 2. The testing machine also includes:

[0120] The radial loading mechanism 102 is configured to apply a radial load to the bearing set 6 through the second loading assembly 9 .

[0121] Specifically, the radial loading mechanism 102 on the testing machine is fixed to the bearing test fixture and may also include a loading cylinder and piston rod 100. More specifically, the second loading assembly 9 or second loading member 91 is connected to the piston rod head of the loading cylinder. When a radial load is required during the test, controlling the extension of the cylinder piston rod 100 can control the radial loading force applied to the core shaft 2, and thus the radial loading force applied to the bearing assembly 6.

[0122] The testing machine of this embodiment is provided with a radial loading mechanism, which can apply a radial load to the bearing group 6 through the second loading component 9. It can not only perform axial loading tests and radial loading tests on the tested bearing group at the same time, thereby broadening the performance of the testing machine, but also realize the smooth and efficient transmission of radial loading force between relatively rotating parts.

[0123] In addition, the present disclosure also provides a bearing testing method based on the testing machine of the above embodiment, comprising:

[0124] Assemble the first bearing 61 and the second bearing 62 to both sides of the positioning portion 21 on the core shaft 2 respectively;

[0125] Install the first bearing 61, the first stopper 3 and the second bearing 62 on the housing 1 so that the bearing assembly 6 and the housing 1 are assembled into one;

[0126] Calculate the thickness t of the adjustment pad 5 based on the required installation clearance of the bearing group 6;

[0127] Install the adjustment washer 5 with a thickness of t axially between the outer ring of the second bearing 62 and the second stopper 4 , and fix the second stopper 4 and the housing 1 ;

[0128] The first loading assembly 8 is mounted on the first end of the core shaft 2 to complete the assembly of the bearing test fixture, and then the bearing test fixture is assembled into the testing machine as a whole.

[0129] The bearing testing method of this embodiment can achieve fine control of the installation clearance and reduce the processing accuracy and processing cost of tooling parts by selectively placing an adjustment pad 5 with a thickness of t between the second limit member 4 and the outer ring of the second bearing 62. The test operation is convenient, which is conducive to improving the test accuracy and test efficiency.

[0130] In some embodiments, the first limiting member 3 further includes a radial limiting portion 32, and the bearing test fixture further includes a third limiting member 7. Installing the first bearing 61, the first limiting member 3, and the second bearing 62 on the housing 1 so that the bearing assembly 6 and the housing 1 are assembled as one body further includes:

[0131] The first bearing 61 , the first limiting member 3 , the third limiting member 7 and the second bearing 62 are mounted on the housing 1 , so that the bearing assembly 6 and the housing 1 are assembled into one body.

[0132] Optionally, by assembling the bearing group 6 and the housing 1 as one, the transfer and management of the tooling fixtures for bearing testing can be facilitated. For example, bearing groups 6 of different sizes can be installed using multiple identical housings 1 to continuously perform fixed installation clearance enhancement life tests on bearing groups of different sizes.

[0133] The bearing testing method of this embodiment can reduce the loss of parts by assembling the bearing group 6 and the housing 1 as one body, and can reduce the risk of redundant material control in scenarios with high requirements for the test environment, such as clean rooms or assembly workshops. At the same time, this testing method facilitates the transfer and management of test fixtures, and can effectively reduce test errors and improve test efficiency.

[0134] In some embodiments, as Figure 9 As shown, the method for calculating the thickness t of the adjustment pad 5 according to the installation clearance required by the bearing assembly 6 includes:

[0135] The thickness t of the adjustment pad 5 is calculated according to the installation clearance required by the bearing assembly 6 , the distance between the second bearing 62 and the third limiting member 7 , and the size of the second limiting member 4 .

[0136] Specifically, the thickness t of the adjustment pad 5 can be calculated by the following formula:

[0137] t = abs;

[0138] Wherein, t is the thickness of the adjustment pad 5;

[0139] s——the required installation clearance of the tested bearing group 6;

[0140] a——the distance from the inner ring end surface of the second bearing 62 to the outer end surface of the third limiting member 7;

[0141] b——the distance from the stop to the inner end face of the second limiting member 4.

[0142] The bearing testing method of this embodiment calculates the thickness of the adjustment pad 5 through the installation clearance required by the bearing group 6, the distance between the second bearing 62 and the third limiter 7, and the size of the second limiter 4. The process is simple and effective, and the dimensions of each part are easy to measure. It can improve the accuracy of the installation clearance control, ensure the validity of the test results, further reduce the processing accuracy and processing cost of the tooling parts, and improve the test accuracy and test efficiency.

[0143] In some embodiments, the first loading assembly 8 includes a first loading member 81, a first auxiliary bearing 82, and a connecting member 83. Before the first loading assembly 8 is mounted on the first end of the core shaft 2, the following steps are further included:

[0144] The first loading member 81 , the first auxiliary bearing 82 , and the connecting member 83 are assembled into one body.

[0145] Specifically, assembling the various components of the first loading assembly 8 into one body can facilitate mounting the first loading member 81 on the first end of the core shaft 2 via the first auxiliary bearing 82 and the connecting member 83 .

[0146] The bearing testing method of this embodiment can reduce the loss of parts by assembling the various components of the first loading assembly 8 into one body, and can reduce the risk of redundant material control in scenarios with high requirements for the test environment, such as clean rooms or assembly workshops. At the same time, this testing method facilitates the transfer and management of the first loading assembly, and can effectively improve the test efficiency.

[0147] In some embodiments, the bearing test fixture further includes a second loading assembly 9, which includes a second loading member 91 and a second auxiliary bearing 92. The positioning portion 21 includes a first positioning member 211, a second positioning member 212, and a flange 213. The two sides of the positioning portion 21 for assembling the first bearing 61 and the second bearing 62 to the core shaft 2 include:

[0148] The assembled first bearing 61 , flange 213 , first positioning member 211 , second auxiliary bearing 92 , second positioning member 212 and second bearing 62 are arranged in sequence along the axial direction.

[0149] The bearing testing method of this embodiment arranges the assembled first bearing 61, flange 213, first positioning member 211, second auxiliary bearing 92, second positioning member 212 and second bearing 62 in sequence along the axial direction, uses the flange 213 as a fixed point for axial positioning along the core shaft 2, and uses the first positioning member 211 and the second positioning member 212 to axially position the second auxiliary bearing 92 and the second bearing 62. This not only achieves matching of the positioning portion 21 with the second loading assembly 9, but also accurately positions the first bearing 61 and the second bearing 62, which can ensure the stability of the axial position of the bearing group during the test, thereby ensuring the accuracy and effectiveness of the test.

[0150] In some embodiments, after the bearing test fixture is assembled into the testing machine, the method further includes:

[0151] Connecting the first loading assembly 8 to the axial loading mechanism 101 of the testing machine; and / or

[0152] The second loading assembly 9 is connected to the radial loading mechanism 102 of the testing machine.

[0153] Specifically, when the axial loading mechanism 101 and the radial loading mechanism 102 are loading cylinders, the test method is to connect the first loading assembly 8 to the piston rod head of the axial loading mechanism 101, and / or connect the second loading assembly 9 to the piston rod head of the radial loading mechanism 102. Specifically, when a radial load needs to be applied during the test, controlling the extension of the cylinder piston rod 100 can control the radial loading force acting on the core shaft 2, and thus the radial loading force acting on the bearing assembly 6.

[0154] The test method of this embodiment connects the first loading assembly 8 to the axial loading mechanism 101 of the testing machine; and / or connects the second loading assembly 9 to the radial loading mechanism 102 of the testing machine, so as to not only perform axial loading tests and radial loading tests on the tested bearing group at the same time, thereby broadening the performance of the testing machine, but also realize smooth and efficient transmission of axial loading force and / or radial loading force between relatively rotating parts.

[0155] In some embodiments, the bearing testing method further comprises:

[0156] After the test is completed, the bearing test fixture is removed from the testing machine, the test results are analyzed, and the adjustment pads 5 of different thicknesses or the bearing groups 6 of different sizes are replaced before continuing with the next set of tests.

[0157] Optionally, after the bearing test fixture is installed on the testing machine, the testing method may also include completing the connection and installation of other components prior to the test, and conducting the test according to the established test plan. Optionally, after the test is completed, the bearing test fixture may be disassembled into its component parts and classified.

[0158] The bearing testing method of this embodiment can effectively improve test efficiency, increase the universality of the test method, reduce test costs, and improve economy.

[0159] In some specific embodiments, Figures 1 to 10As shown, the fixture for bearing testing includes a shell 1, a core shaft 2, a first limiter 3, a second limiter 4, an adjustment pad 5, a third limiter 7, a first loading assembly 8 and a second loading assembly 9, wherein the shell 1 is provided with a first through hole 11 and a second through hole 12, the second through hole 12 is a sink hole, the positioning portion 21 provided on the outer wall of the core shaft 2 includes a first positioning member 211, a second positioning member 212 and a flange 213, the first limiter 3 includes an axial limiter 31 and a radial limiter 32, the first loading assembly 8 includes a first loading member 81, a first auxiliary bearing 82 and a connecting member 83, the connecting member 83 is provided with a square mounting hole 831, and the second loading assembly 9 includes a second loading member 91 and a second auxiliary bearing 92.

[0160] Specifically, the specific connection methods of the various components in the above-mentioned bearing test fixture with installation clearance control function include:

[0161] The first loading member 81 is connected to the axial loading mechanism 101 of the testing machine by screws or other means; the outer ring of the first auxiliary bearing 82 is installed in the groove of the first loading member 81, and the inner ring is installed on the connecting member 83; the connecting member 83 is installed to one end of the square head of the core shaft 2 through the square mounting hole 831, and contacts the square head end face of the core shaft 2 through the inner end face of the mounting hole 831; the first limit member 3 is installed in the first through hole 11 of the shell 1 and is fastened with screws; the first bearing 61, the first positioning member 211, the second auxiliary bearing 92, the second positioning member 212, and the second bearing 62 are installed on the core shaft 2 in sequence; the second loading member 91 is installed on the outer ring of the second auxiliary bearing 92 and is connected to the radial loading mechanism 102 of the testing machine by screws or other means; the third limit member 7 is installed in the second through hole 12 of the shell 1 and is fastened by screws; the second limit member 4 is installed in the inner hole of the third limit member 7 and is fastened by screws; the adjustment pad 5 is installed between the second bearing 62 and the second limit member 4.

[0162] Specifically, the bearing testing method based on the above-mentioned bearing testing fixture includes:

[0163] Assemble the first loading member 81, the first auxiliary bearing 82, and the connecting member 83 together;

[0164] Assemble the inner ring of the first bearing 61, the core shaft 2, the first positioning member 211, the second loading member 91, the inner ring of the second auxiliary bearing 92, the second positioning member 212, and the inner ring of the second bearing 62 together;

[0165] Install the outer ring of the first bearing 61 onto the first loading member 81;

[0166] Install the first loading member 81 into the first through hole 11 of the housing 1 and fix the first loading member 81 to the housing 1 with screws;

[0167] Install the assembled core shaft 2, first bearing 61, second bearing 62, etc. into the housing 1, so that the bearing assembly 6 and the housing 1 are assembled into one;

[0168] Install the third limiting member 7 onto the housing 1 and secure it with screws;

[0169] Calculate the thickness t of the adjustment pad 5 based on the required installation clearance of the bearing assembly 6, the distance between the second bearing 62 and the third stopper 7, and the size of the second stopper 4, where t = abs, where t is the thickness of the adjustment pad 5; s is the required installation clearance of the bearing assembly 6; a is the distance from the inner ring end face of the second bearing 62 to the outer end face of the third stopper 7; and b is the distance from the stopper end face to the inner end face of the second stopper 4.

[0170] Install the outer ring of the second bearing 62, the adjustment washer 5 with a thickness of t, and the second limiter 4 into the third limiter 7 in sequence and fasten them with screws;

[0171] Install the connector 83 of the first loading assembly 8 onto the square head of the mandrel 2, and then install the entire bearing test fixture into the testing machine;

[0172] Connect the first loading member 81 and the second loading member 91 to the piston rod 100 of the axial loading mechanism 101 and the radial loading mechanism 102 of the testing machine respectively;

[0173] Complete the connection and installation of other components before the enhanced life test, such as sensor installation, and then start the test according to the established test plan;

[0174] After the test is completed, remove the bearing test fixture from the testing machine, disassemble the fixture components, analyze the test results or continue with the next set of tests.

[0175] The bearing testing method of this embodiment can achieve fine control of the installation clearance and reduce the processing accuracy and processing cost of tooling parts by selectively placing an adjustment pad 5 with a thickness of t between the second limit member 4 and the outer ring of the second bearing 62. The test operation is convenient, which is conducive to improving the test accuracy and test efficiency. The process of calculating the thickness of the adjustment pad 5 is simple and effective, and the dimensions of each part are easy to measure, which can improve the accuracy of the installation clearance control, ensure the validity of the test results, further reduce the processing accuracy and processing cost of tooling parts, and improve the test accuracy and test efficiency.

[0176] The bearing testing method of this embodiment can reduce the loss of parts by assembling the bearing group 6 and the housing 1 as one and assembling the first loading assembly 8 as one. It can reduce the risk of redundant material management in scenarios with high requirements for the test environment, increase the convenience of transferring and managing test fixtures, effectively reduce test errors and improve test efficiency; the flange 213 is used as a fixed point for axial positioning along the core shaft 2, and the first positioning member 211 and the second positioning member 212 are used to axially position the second auxiliary bearing 92 and the second bearing 62, which not only achieves the matching of the positioning portion 21 and the second loading assembly 9, but also accurately positions the first bearing 61 and the second bearing 62, which can ensure the stability of the axial position of the bearing group during the test, thereby ensuring the accuracy and effectiveness of the test.

[0177] The bearing testing method of this embodiment can simultaneously perform axial loading tests and radial loading tests on the tested bearing group, thereby broadening the performance of the testing machine, and can also achieve smooth and efficient transmission of axial loading force and radial loading force between relatively rotating parts, effectively improving test efficiency, improving the universality of the test method, reducing test costs, and improving economy.

[0178] The above is a detailed introduction to a bearing test fixture, a testing machine, and a bearing test method provided by the present disclosure. Specific embodiments are used herein to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the method and core ideas of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the scope of protection of the claims of the present disclosure.

Claims

1. A fixture for bearing testing, characterized in that: Used for installing a bearing group (6), the bearing group (6) includes a first bearing (61) and a second bearing (62), and the bearing test fixture includes: The housing (1) is a hollow cavity structure, with a first through hole (11) and a second through hole (12) provided on both sides thereof; A core shaft (2) is located in the housing (1), and both ends of the core shaft (2) are respectively mounted on the housing (1) via the first bearing (61) and the second bearing (62), the first end of the core shaft (2) passes through the first through hole (11) and is used to connect to the axial loading mechanism (101), the second end of the core shaft (2) passes through the second through hole (12) and is used to connect to the drive shaft, and a positioning portion (21) is provided on the outer wall of the core shaft (2), and the positioning portion (21) abuts between the first bearing (61) and the second bearing (62); a first limiting member (3) comprising an axial limiting portion (31), the axial limiting portion (31) being connected to the housing (1) and configured to limit the first bearing (61) from moving axially in a direction away from the positioning portion (21); a second limiting member (4) configured to limit the second bearing (62) from moving axially in a direction away from the positioning portion (21); an adjusting pad (5), optionally provided between the second bearing (62) and the second stopper (4), configured to adjust the installation clearance of the bearing assembly (6); and a first loading assembly (8) disposed outside the housing (1) and configured to rotatably connect the first end of the core shaft (2) to the axial loading mechanism (101) so as to transmit the axial load output by the axial loading mechanism (101) to the bearing group (6); the first loading assembly (8) comprises a first loading member (81) and a first auxiliary bearing (82), the first loading member (81) being used to receive the axial load applied by the axial loading mechanism (101), and the first auxiliary bearing (82) being connected between the first loading member (81) and the first end of the core shaft (2); Wherein, under the action of the axial force applied by the axial loading mechanism (101), the inner rings of the first bearing (61) and the second bearing (62) move to one side simultaneously with the core shaft (2), and the positions of the outer rings of the first bearing (61) and the second bearing (62) are fixed relative to the housing (1).

2. The bearing test fixture according to claim 1, characterized in that: The first limiting member (3) further includes a radial limiting portion (32), which is provided between the first bearing (61) and the housing (1) and is configured to radially limit the first bearing (61); The bearing test fixture further comprises: a third limiting member (7), which is provided between the second bearing (62) and the housing (1) and is configured to radially limit the second bearing (62).

3. The bearing test fixture according to claim 1, characterized in that: The first loading assembly (8) further includes a connecting member (83) connected between the first auxiliary bearing (82) and the first end of the core shaft (2); The connecting member (83) is provided with a mounting hole (831) on an end surface close to the core shaft (2), and the first end of the core shaft (2) is embedded in the mounting hole (831) to limit the core shaft (2) from rotating in the circumferential direction.

4. The bearing test fixture according to any one of claims 1 to 3, characterized in that: Also includes: a second loading assembly (9), disposed within the housing (1) and connected to the core shaft (2), configured to transmit the radial load output by the radial loading mechanism (102) to the bearing assembly (6); Wherein, the housing (1) is provided with a third through hole (13) for connecting the second loading assembly (9) and the radial loading mechanism (102).

5. The bearing test fixture according to claim 4, characterized in that: The second loading assembly (9) includes a second loading member (91) and a second auxiliary bearing (92), wherein the second loading member (91) is used to receive the radial load applied by the radial loading mechanism (102), and the second auxiliary bearing (92) is connected between the second loading member (91) and the core shaft (2).

6. The bearing test fixture according to claim 5, characterized in that: The positioning portion (21) includes a flange (213) provided on the outer wall of the core shaft (2), a first positioning member (211) and a second positioning member (212) sleeved on the outside of the core shaft (2), the flange (213) being provided at the first end of the core shaft (2), the first bearing (61) being abutted against the side of the flange (213) away from the first positioning member (211), the first positioning member (211) being abutted between the flange (213) and the second auxiliary bearing (92), and the second positioning member (212) being abutted between the second auxiliary bearing (92) and the second bearing (62).

7. A testing machine, characterized in that: include: The bearing test fixture according to any one of claims 1 to 6; a drive shaft connected to the second end of the core shaft (2) and configured to drive the core shaft (2) to rotate; and An axial loading mechanism (101) is configured to apply an axial load to the bearing assembly (6) through the first end of the core shaft (2).

8. The testing machine according to claim 7, characterized in that: The bearing test fixture further comprises a second loading assembly (9), which is arranged in the housing (1) and connected to the core shaft (2). The testing machine further comprises: A radial loading mechanism (102) is configured to apply a radial load to the bearing group (6) through the second loading assembly (9).

9. A bearing testing method based on the testing machine according to claim 7 or 8, characterized in that: include: Assembling the first bearing (61) and the second bearing (62) to both sides of the positioning portion (21) on the core shaft (2) respectively; Installing the first bearing (61), the first limiting member (3), and the second bearing (62) on the housing (1), so that the bearing assembly (6) and the housing (1) are assembled into one body; Calculating the thickness t of the adjustment pad (5) based on the installation clearance required by the bearing group (6); An adjustment pad (5) having a thickness of t is axially mounted between the outer ring of the second bearing (62) and the second limiting member (4), and the second limiting member (4) and the housing (1) are fixed; The first loading assembly (8) is mounted on the first end of the core shaft (2) to complete the assembly of the bearing test fixture, and then the bearing test fixture is assembled into the testing machine as a whole.

10. The bearing testing method according to claim 9, characterized in that: The first limiting member (3) further includes a radial limiting portion (32), and the bearing test fixture further includes a third limiting member (7). The first bearing (61), the first limiting member (3), and the second bearing (62) are mounted on the housing (1) so that the bearing group (6) and the housing (1) are assembled into one body. The method further includes: The first bearing (61), the first limiting member (3), the third limiting member (7) and the second bearing (62) are mounted on the housing (1), so that the bearing group (6) and the housing (1) are assembled into one body.

11. The bearing testing method according to claim 10, characterized in that: The method for calculating the thickness t of the adjustment pad (5) based on the installation clearance required by the bearing group (6) comprises: The thickness t of the adjustment pad (5) is calculated based on the required installation clearance of the bearing group (6), the distance between the second bearing (62) and the third limiting member (7), and the size of the second limiting member (4).

12. The bearing testing method according to claim 9, characterized in that: The first loading assembly (8) comprises a first loading member (81), a first auxiliary bearing (82) and a connecting member (83), and before the first loading assembly (8) is mounted on the first end of the core shaft (2), it also comprises: The first loading member (81), the first auxiliary bearing (82), and the connecting member (83) are assembled into one body.

13. The bearing testing method according to claim 9, characterized in that: The bearing test fixture further comprises a second loading assembly (9), the second loading assembly (9) comprising a second loading member (91) and a second auxiliary bearing (92), the positioning portion (21) comprising a first positioning member (211), a second positioning member (212) and a flange (213), and the two sides of the positioning portion (21) for assembling the first bearing (61) and the second bearing (62) on the core shaft (2) comprise: The assembled first bearing (61), the flange (213), the first positioning member (211), the second auxiliary bearing (92), the second positioning member (212), and the second bearing (62) are arranged in sequence along the axial direction.

14. The bearing testing method according to any one of claims 9 to 13, characterized in that: After the bearing test fixture is assembled into the testing machine as a whole, the following steps are further included: connecting the first loading assembly (8) to the axial loading mechanism (101) of the testing machine; and / or The second loading assembly (9) is connected to the radial loading mechanism (102) of the testing machine.

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