Tapered roller bearing group test device

Abstract

The present invention discloses a test device for a tapered roller bearing group, comprising: a base for mounting the outer ring of the tapered roller bearing group to be tested during testing; a main shaft for mounting the inner ring of the tapered roller bearing group to be tested during testing; a drive device connected to the main shaft for driving the main shaft to rotate during testing; a first force-applying device for applying a radial load to the main shaft during testing; an axial force-assisted bearing assembly comprising a first rotor and a second rotor that are rotatable relative to each other, the first rotor and the second rotor being capable of transmitting axial force, the first rotor being mounted on the main shaft; and a second force-applying device, the second rotor being mounted on the second force-applying device. During testing, the second force-applying device applies a direction-varying axial force to the second rotor to thereby apply a direction-varying axial force to the main shaft. The present invention aims to provide a test device for a tapered roller bearing group that can better simulate actual working loads.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing testing, in particular to a testing device for a tapered roller bearing group. Background Art

[0002] Tapered roller bearings are commonly used in core components of engineering machinery, such as gearboxes and drive axles. They play a vital role in reducing component wear and improving the rotational stability of gears, shafts, and other parts. These components are typically equipped with tapered roller bearings at both ends of their rotating shafts, and are used in groups. During operation, the tapered roller bearings within these components rotate at high speeds while being subjected to axial and radial loads. The direction and magnitude of these axial loads frequently change, posing a significant challenge to the service life of the tapered roller bearings and further impacting the reliability of these components.

[0003] Existing bearing test equipment suffers from a single load and is unable to simulate the actual operating loads of a box-bridge tapered roller bearing assembly. Consequently, test results cannot directly guide the design and assembly process improvements of box-bridge tapered roller bearings. Rapid analysis and verification of tapered roller bearing reliability is essential for optimizing the box-bridge bearing connection and improving the service life and reliability of the box-bridge. Summary of the Invention

[0004] The object of the present invention is to provide a tapered roller bearing group test device that can better simulate actual working loads.

[0005] The present invention discloses a tapered roller bearing group testing device, comprising:

[0006] Base, used to mount the outer ring of the tapered roller bearing set to be tested during the test;

[0007] A spindle, used to mount the inner ring of the tapered roller bearing set to be tested during the test;

[0008] A driving device, drivingly connected to the main shaft, for driving the main shaft to rotate during testing;

[0009] a first force applying device, used for applying a radial load to the main shaft during a test;

[0010] An axial force auxiliary bearing assembly includes a first rotor and a second rotor that are rotatable relative to each other, wherein the first rotor and the second rotor can transmit axial force, and the first rotor is mounted on the main shaft;

[0011] The second force applying device is mounted on the second force applying device. During a test, the second force applying device applies an axial force with a changing direction to the second rotor to apply an axial force with a changing direction to the main shaft.

[0012] In some embodiments, the axial force auxiliary bearing assembly includes a first bearing and a second bearing, both inner rings of which are mounted on the main shaft and outer rings of which are mounted on the second force-applying device, the main shaft is provided with a first limiting portion and a second limiting portion, the inner ring of the first bearing and the inner ring of the second bearing are located between the first limiting portion and the second limiting portion and are in axial contact with the first limiting portion and the second limiting portion respectively; when the second force-applying device applies an axial force in a first direction to the main shaft, the second force-applying device causes the outer ring of the first bearing to press against the inner ring of the first bearing through the rolling element of the first bearing, so that the first shaft The inner ring of the second bearing transmits the axial force in the first direction to the main shaft by pressing against the first limiting portion, and at this time the second force-applying device causes the outer ring of the second bearing to break contact with the rolling element of the second bearing; when the second force-applying device applies an axial force in a second direction opposite to the first direction to the main shaft, the second force-applying device causes the outer ring of the second bearing to press against the inner ring of the second bearing through the rolling element of the second bearing, so that the inner ring of the second bearing transmits the axial force in the second direction to the main shaft by pressing against the second limiting portion, and at this time the second force-applying device causes the outer ring of the first bearing to break contact with the rolling element of the first bearing.

[0013] In some embodiments, the first bearing includes a first tapered roller bearing, the second bearing includes a second tapered roller bearing, the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing are both interference fit with the second force-applying device, and the second force-applying device includes a boss provided between the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing, and the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing are axially in contact with the opposite side surfaces of the boss respectively.

[0014] In some embodiments, it also includes a stopper that rests between the inner ring of the first tapered roller bearing and the inner ring of the second tapered roller bearing, the first limiting portion includes a shoulder provided on the main shaft, and the second limiting portion includes a nut that cooperates with the main shaft thread, and the inner ring of the first tapered roller bearing, the inner ring of the second tapered roller bearing, and the stopper are fixedly connected to the main shaft through the thread cooperation between the nut and the second limiting portion.

[0015] In some embodiments, the second force-applying device includes a bearing mounting seat for mounting the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing, a sleeve surrounding the bearing mounting seat and fixedly connected to the base, a piston cylinder fixedly connected to the sleeve, and a piston slidingly fitted with the piston cylinder and fixedly connected to the bearing mounting seat. The boss is provided on the inner wall of the bearing mounting seat, and the second force-applying device applies an axial force with changing direction to the main shaft through the reciprocating sliding of the piston relative to the piston cylinder.

[0016] In some embodiments, the first force-applying device includes a piston cylinder, a bearing and a bearing seat, the inner ring of the bearing is mounted on the main shaft, the outer ring of the bearing is mounted on the bearing seat, and the piston or piston cylinder of the piston cylinder radially abuts against the outer surface of the bearing seat to apply a radial load to the main shaft.

[0017] In some embodiments, the bearing seat includes four outer surfaces that are symmetrically distributed and perpendicular to each other, and the piston or piston cylinder of the piston cylinder abuts against one of the four outer surfaces.

[0018] In some embodiments, during the test, the axial force assisting bearing assembly includes two tapered roller bearings, and during the test, the bearing seat is located between the two tapered roller bearings.

[0019] In some embodiments, a control device is also included that is signal-connected to the first force-applying device, the second force-applying device, and the driving device. The control device is used to control the driving device to drive the main shaft to rotate and control the first force-applying device and the second force-applying device to apply radial load and axial load to the main shaft.

[0020] In some embodiments, a detection device is further included that is signal-connected to the control device, and the detection device is used to detect the temperature and vibration signals of the tested tapered roller bearing group during the test.

[0021] Based on the tapered roller bearing group test device provided by the present invention, by setting a main shaft driven by a driving device, a first force-applying device, an axial force auxiliary bearing assembly and a second force-applying device, it is possible to rotate during the test and apply radial loads and axial loads with changing directions to the tested tapered roller bearing group. The test conditions are more consistent with the actual working conditions, and the test results are more accurate.

[0022] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 Schematic diagram of the structure of a tapered roller bearing group test device according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 The schematic cross-sectional structure diagram of the tapered roller bearing group test device shown;

[0026] Figure 3 for Figure 1 A schematic cross-sectional view of a portion of the structure shown;

[0027] Figure 4 for Figure 1 The schematic diagram of the structure of the tapered roller bearing group to be tested is shown;

[0028] Figure 5 for Figure 1 The structural schematic diagram of the second force applying device is shown. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] Unless otherwise specified, the axial and radial directions in this application are based on the main shaft 2. The direction of the central axis of the main shaft 2 is the axial direction, and the radial direction of the main shaft 2 is the radial direction. Figures 1 to 5 As shown, the tapered roller bearing group test device of this embodiment includes a base 1, a main shaft 2, a driving device 3, a first force applying device 4, an axial force auxiliary applying bearing assembly 6 and a second force applying device 5.

[0035] like Figure 1 、 Figure 2 and Figure 4As shown, the tapered roller bearing set to be tested includes tapered roller bearing 1 91 and tapered roller bearing 2 92. In some embodiments not shown, the tapered roller bearing set may also include tapered roller bearing 3 and further tapered roller bearings. Base 1 is used to mount the outer ring of the tapered roller bearing set to be tested during testing. Spindle 2 is used to mount the inner ring of the tapered roller bearing set to be tested during testing. In the embodiment shown in the figure, the two tapered roller bearings of the tapered roller bearing set are mounted at both ends of spindle 2. The inner rings of the two tapered roller bearings of the tapered roller bearing set have an interference fit with the spindle. A bearing seat is provided on the base, and the outer rings of the two tapered roller bearings of the tapered roller bearing set are interference fit onto the bearing seat of base 1.

[0036] Drive device 3 is connected to spindle 2 and is used to rotate spindle 2 during testing. Drive device 3 includes a power machine such as an electric motor or internal combustion engine. This rotation of spindle 3 simulates the rotating state of a tapered roller bearing assembly during operation.

[0037] The first force applying device 4 is used to apply a radial load to the main shaft 2 during the test. The first force applying device 4 can simulate the radial force state of the tapered roller bearing group during operation.

[0038] The axial force auxiliary application bearing assembly 6 includes a first rotor and a second rotor that can rotate relative to each other, and the axial force can be transmitted between the first rotor and the second rotor. The first rotor is mounted on the main shaft 2. The second rotor is mounted on the second force-applying device 5. During the test, the second force-applying device 5 applies an axial force with a changing direction to the main shaft 2 by applying an axial force with a changing direction to the second rotor. The axial force auxiliary application bearing assembly 6 is provided, and the rotational cooperation of the first rotor and the second rotor can realize a rotatable connection between the second force-applying device 5 and the main shaft 2. At the same time, when the second force-applying device 5 applies an axial force, the axial force is transmitted to the first rotor through the second rotor, and the first rotor then transmits the axial force to the rotating shaft, so that the second force-applying device 5 can apply an axial force with a changing direction to the main shaft 2, which can simulate the working condition of the tapered roller bearing group being subjected to an axial load with a changing direction during operation.

[0039] The tapered roller bearing assembly testing apparatus of this embodiment comprises a main shaft 2 driven by a drive device 3, a first force-applying device 4, an auxiliary axial force-applying bearing assembly 6, and a second force-applying device 5. This allows for rotation during testing and the application of radial loads and directional axial loads to the tapered roller bearing assembly under test. This allows for more accurate test results, as well as more consistent test conditions with actual operating conditions. The tapered roller bearing assembly testing apparatus of this embodiment can be used to test tapered roller bearings for fatigue life, clearance changes, or strength.

[0040] In some embodiments, as Figure 2As shown, the axial force auxiliary application bearing assembly 6 includes a first bearing 61 and a second bearing 62, both of whose inner rings are mounted on the main shaft 2 and whose outer rings are mounted on the second force application device. The main shaft 2 is provided with a first stopper 21 and a second stopper 22. The inner rings of the first bearing 61 and the inner rings of the second bearing 62 are located between the first stopper 21 and the second stopper 22 and axially abut against the first stopper 21 and the second stopper 22, respectively. In this embodiment, the first rotor includes the inner rings of the first bearing 61 and the second bearing 62, and the second rotor includes the outer rings of the first bearing 61 and the second bearing 62. When the second force-applying device 5 applies an axial force in the first direction to the spindle 2, it drives the outer ring of the first bearing 61 and the outer ring of the second bearing 62 to move in the first direction. The outer ring of the first bearing 61 presses against the rolling element of the first bearing 61, which then presses against the inner ring of the first bearing 61. The inner ring of the first bearing 61 then presses against the first stop 21, thereby transmitting the axial force in the first direction to the spindle 2. At this time, the second force-applying device 5 disengages the outer ring of the second bearing 62 from the rolling element of the second bearing 62. That is, the first direction is also the direction in which the outer ring of the second bearing 62 moves away from the rolling element and inner ring of the second bearing 62. Driven by the second force-applying device 5, the outer ring of the second bearing 62 moves in the first direction to a position where it disengages from the rolling element of the second bearing 62. At this point, there is no contact or friction between the outer ring of the second bearing 62 and the rolling element, thereby improving the operating condition of the second bearing 62 and helping to extend its service life. Both the first and second directions are axial. When the second force-applying device 5 applies an axial force in the second direction, opposite to the first direction, to the spindle 2, the second force-applying device 5 drives the outer ring of the first bearing 61 and the outer ring of the second bearing 62 to move in the second direction. The outer ring of the second bearing 62 presses against the rolling elements of the second bearing 62, which then presses against the inner ring of the second bearing 62. The inner ring of the second bearing 62 then presses against the second stopper 22, thereby transmitting the second-direction axial force to the spindle 2. At this time, the second force-applying device 5 disengages the outer ring of the first bearing 61 from the rolling elements of the outer ring of the first bearing 61. In other words, the second direction also moves the outer ring of the first bearing 61 away from the rolling elements and inner ring of the first bearing 61. Driven by the second force-applying device 5, the outer ring of the first bearing 61 moves in the second direction to a position where it disengages from the rolling elements of the first bearing 61. At this point, there is no contact or friction between the outer ring of the first bearing 61 and the rolling elements, thereby improving the operating condition of the first bearing 61 and helping to extend its service life.

[0041] In some embodiments, as Figure 2As shown, the first bearing 61 comprises a first tapered roller bearing, and the second bearing 62 comprises a second tapered roller bearing. The outer rings of the first tapered roller bearing and the second tapered roller bearing are both interference fit with the second force-applying device 5. The second force-applying device 5 includes a boss 51 disposed between the outer rings of the first tapered roller bearing and the outer rings of the second tapered roller bearing. Axially, the outer rings of the first tapered roller bearing and the outer rings of the second tapered roller bearing respectively abut against opposite side surfaces of the boss 51. In some embodiments not shown, the first bearing 61 and the second bearing 62 may also be thrust bearings, each comprising two opposing bearing rings and a rolling element located between the two bearing rings. In this case, the inner rings of the first bearing 61 and the second bearing 62 are the bearing rings of the thrust bearings mounted on the main shaft 2, and the outer rings of the first bearing 61 and the second bearing 62 are the bearing rings of the thrust bearings mounted on the main shaft 2.

[0042] In some embodiments, in order to facilitate the installation of the first tapered roller bearing and the second tapered roller bearing and the stable positioning of their inner rings, as shown in FIG. Figure 2 As shown, the tapered roller bearing assembly test device also includes a stopper 71 that rests between the inner rings of the first and second tapered roller bearings. The first stopper 21 comprises a shoulder disposed on the main shaft 2, and the second stopper 22 comprises a nut that engages with the main shaft 2. The threaded engagement of the nut with the second stopper 22 secures the inner rings of the first and second tapered roller bearings, the stopper 71, and the main shaft 2. In this embodiment, the stopper 71 and the nut ensure secure positioning of the inner rings of the first and second tapered roller bearings. The nut can be tightened as tightly as possible when threaded with the main shaft 2 to apply the maximum possible thread preload, preventing the nut from loosening and ensuring a more secure and reliable installation of the first and second tapered roller bearings. The threaded engagement of the nut with the main shaft 2 also facilitates installation and replacement of the first and second tapered roller bearings.

[0043] In some embodiments, as Figure 2As shown, the second force-applying device 5 includes a bearing mounting seat for mounting the outer rings of the first and second tapered roller bearings, a sleeve surrounding the bearing mounting seat and fixedly connected to the base 1, a piston cylinder fixedly connected to the sleeve, and a piston that slides with the piston cylinder and fixedly connected to the bearing mounting seat. The piston is fixedly connected to the bearing mounting seat via a latch 56. As shown, the bearing mounting seat includes a second force-applying bearing mounting seat 52, the sleeve includes a second force-applying sleeve 53, the piston cylinder includes a second force-applying piston cylinder 54, and the piston includes a second force-applying piston 55. A boss 51 is provided on the inner wall of the bearing mounting seat. The second force-applying device 5 applies a direction-varying axial force to the main shaft 2 by the reciprocating sliding of the piston relative to the piston cylinder. The piston and piston cylinder can be piston cylinders such as air cylinders and hydraulic cylinders. This embodiment can stably and reliably apply a direction-varying axial force to the main shaft 2.

[0044] In some embodiments, as Figure 1 and Figure 3 As shown, the first force-applying device 4 includes a piston cylinder, a bearing, and a bearing seat. The bearing includes a first force-applying bearing 43, the piston cylinder includes a first force-applying piston cylinder 41, and the bearing seat includes a first force-applying bearing seat 42. The inner ring of the bearing is mounted on the main shaft 2, and the outer ring of the bearing is mounted on the bearing seat. The piston or piston cylinder of the piston cylinder radially abuts against the outer surface of the bearing seat to apply a radial load to the main shaft 2. The piston cylinder can apply a stable and reliable radial force to the main shaft 2.

[0045] In some embodiments, as Figure 3 As shown, the bearing seat includes four symmetrically distributed and mutually perpendicular outer surfaces. The bearing seat shown in the figure is an octagonal bearing seat, which includes four main outer surface planes and four corner planes. That is, the four outer surfaces of the bearing seat are four main outer surface planes, and the piston or piston barrel of the piston cylinder abuts against one of the four outer surfaces. In this embodiment, when the piston or piston barrel of the piston cylinder cooperates with different ones of the four outer surfaces, radial loads can be applied to the main shaft 2 from different directions.

[0046] In some embodiments, during the test, the axial force assisting bearing assembly 6 includes two tapered roller bearings, and during the test, the bearing seat is located between the two tapered roller bearings.

[0047] In some embodiments, as Figure 1As shown, the tapered roller bearing assembly test apparatus further includes a control device 73 connected to the first force-applying device 4, the second force-applying device 5, and the drive device 3. The control device 73 is used to control the drive device 3 to drive the spindle 2 to rotate and to control the first force-applying device 4 and the second force-applying device 5 to apply radial and axial loads to the spindle 2. The control device 73 can control the magnitude and duration of the radial force applied by the first force-applying device 4 to the spindle 2, the speed and direction of the spindle 2 driven by the drive device 3, and the magnitude, direction, and frequency of directional changes of the axial force applied by the second force-applying device 5 to the spindle 2.

[0048] In some embodiments, the tapered roller bearing group testing apparatus further includes a lubrication system 74 for lubricating the apparatus.

[0049] In some embodiments, the tapered roller bearing group testing device also includes a detection device 72 that is signal-connected to the control device 73. The detection device 72 is used to detect the temperature and vibration signals of the tested tapered roller bearing group during the test, so that the performance of the tapered roller bearing group can be evaluated by combining multiple detection results.

[0050] In some embodiments, the control device described above may be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof, for performing the functions described in the present invention.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. A tapered roller bearing group test device, characterized in that: include: A base (1) for mounting the outer ring of the tapered roller bearing set to be tested during the test; A spindle (2) for mounting the inner ring of the tapered roller bearing set to be tested during the test; A driving device (3) is connected to the main shaft (2) and is used to drive the main shaft (2) to rotate during testing; A first force applying device (4) is used to apply a radial load to the main shaft (2) during testing; An axial force auxiliary bearing assembly (6) comprises a first rotor and a second rotor which are relatively rotatable, wherein the first rotor and the second rotor are capable of transmitting axial force, and the first rotor is mounted on the main shaft (2); a second force applying device (5), the second rotor being mounted on the second force applying device (5), and during a test, the second force applying device (5) applies an axial force of varying direction to the second rotor to thereby apply an axial force of varying direction to the main shaft (2); The axial force auxiliary bearing assembly (6) includes a first bearing (61) and a second bearing (62), both inner rings of which are mounted on the main shaft (2) and outer rings of which are mounted on the second force applying device (5), and a first limiting portion and a second limiting portion are provided on the main shaft (2), and the inner ring of the first bearing (61) and the inner ring of the second bearing (62) are located between the first limiting portion and the second limiting portion and are in contact with the first limiting portion and the second limiting portion respectively along the axial direction; when the second force applying device (5) applies an axial force in a first direction to the main shaft (2), the second force applying device (5) causes the outer ring of the first bearing (61) to press against the inner ring of the first bearing (61) through the rolling element of the first bearing (61), so that the inner ring of the first bearing (61) The outer ring of the second bearing (62) is pressed against the first limiting portion to transmit the axial force in the first direction to the main shaft (2), and at this time, the second force-applying device (5) causes the outer ring of the second bearing (62) to be out of contact with the rolling element of the second bearing (62); when the second force-applying device (5) applies an axial force in a second direction opposite to the first direction to the main shaft (2), the second force-applying device (5) causes the outer ring of the second bearing (62) to be pressed against the inner ring of the second bearing (62) through the rolling element of the second bearing (62), so that the inner ring of the second bearing (62) transmits the axial force in the second direction to the main shaft (2) by pressing against the second limiting portion, and at this time, the second force-applying device (5) causes the outer ring of the first bearing (61) to be out of contact with the rolling element of the first bearing (61).

2. The tapered roller bearing group testing device according to claim 1, characterized in that: The first bearing (61) includes a first tapered roller bearing, and the second bearing (62) includes a second tapered roller bearing. The outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing are both interference fit with the second force applying device (5), and the second force applying device (5) includes a boss provided between the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing, and the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing are respectively in contact with two opposite side surfaces of the boss along the axial direction.

3. The tapered roller bearing group testing device according to claim 2, characterized in that: The invention also includes a stopper (71) abutting between the inner ring of the first tapered roller bearing and the inner ring of the second tapered roller bearing, the first limiting portion includes a shaft shoulder provided on the main shaft (2), and the second limiting portion includes a nut threadedly engaged with the main shaft (2), and the inner ring of the first tapered roller bearing, the inner ring of the second tapered roller bearing, the stopper (71) and the main shaft (2) are fixedly connected through the threaded engagement of the nut and the second limiting portion.

4. The tapered roller bearing group testing device according to claim 2, characterized in that: The second force-applying device (5) includes a bearing mounting seat for mounting the outer ring of the first tapered roller bearing and the outer ring of the second tapered roller bearing, a sleeve surrounding the bearing mounting seat and fixedly connected to the base (1), a piston cylinder fixedly connected to the sleeve, and a piston slidingly matched with the piston cylinder and fixedly connected to the bearing mounting seat. The boss is provided on the inner wall of the bearing mounting seat. The second force-applying device (5) applies an axial force with a changing direction to the main shaft (2) by the reciprocating sliding of the piston relative to the piston cylinder.

5. The tapered roller bearing group testing device according to claim 1, characterized in that: The first force applying device (4) comprises a piston cylinder, a bearing and a bearing seat, the inner ring of the bearing is mounted on the main shaft (2), the outer ring of the bearing is mounted on the bearing seat, and the piston or piston cylinder of the piston cylinder abuts against the outer surface of the bearing seat in the radial direction to apply a radial load to the main shaft (2).

6. The tapered roller bearing group testing device according to claim 5, characterized in that: The bearing seat includes four outer surfaces that are symmetrically distributed and perpendicular to each other, and the piston or piston cylinder of the piston cylinder abuts against one of the four outer surfaces.

7. The tapered roller bearing group testing device according to claim 5, characterized in that: During the test, the axial force auxiliary application bearing assembly (6) includes two tapered roller bearings, and during the test, the bearing seat is located between the two tapered roller bearings.

8. The tapered roller bearing group testing device according to claim 1, characterized in that: It also includes a control device (73) connected to the first force-applying device (4), the second force-applying device (5) and the driving device (3) by signals, and the control device (73) is used to control the driving device (3) to drive the main shaft (2) to rotate and control the first force-applying device (4) and the second force-applying device (5) to apply radial load and axial load to the main shaft (2).

9. The tapered roller bearing group testing device according to claim 8, characterized in that: It also includes a detection device connected to the control device (73) by signal, and the detection device is used to detect the temperature and vibration signals of the tested tapered roller bearing group during the test.

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