Shaft parts fatigue test device

Abstract

The present invention discloses a fatigue testing device for shaft parts, comprising a first fixing component, a second fixing component, a first loading component, a second loading component, a torque transmission mechanism connected to the first loading component and a third fixing component, wherein the first loading component is used to apply an axial force to the first axial end of the shaft to be tested, the second loading component is used to apply an axial force, a torque, a lateral force and a rotational bending moment to the second axial end of the shaft to be tested, and the torque transmission mechanism is used to transmit the torque and stop transmitting the axial force, the lateral force and the rotational bending moment; the scheme completes the fatigue test of the shaft to be tested through the coordinated cooperation of the first fixing component, the first loading component, the second fixing component, the second loading component, the torque transmission mechanism and the third fixing component, and compared with the prior art, the scheme truly simulates the loading state of the shaft to be tested, the test result has high reliability, can effectively verify the safe life of the shaft to be tested, has strong practicality, and is suitable for wide promotion and application.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue testing of aircraft engine parts, in particular to a fatigue testing device for shaft parts. Background Art

[0002] As one of the key parts of aircraft engines, shaft parts have the main function of connecting the rotating parts of aircraft engines and transmitting torque, while balancing the axial force generated by the pressure difference of each rotor. Therefore, during the working process, the shaft parts of aircraft engines are mainly subjected to torque, aerodynamic axial force, vibration torque, lateral force and rotational bending moment. According to the provisions of GJB241A, GJB242A and CCAR-33, fatigue test assessment of shaft parts is required.

[0003] In the fatigue test of shaft parts, the load state of shaft parts is complex, and torque, pneumatic axial force, vibration torque, lateral force and rotational bending moment load need to be applied to the axial flow parts at the same time. And because some shaft parts are subjected to pneumatic axial force at both ends of the axial direction during work, the fatigue test of such shaft parts requires the application of pneumatic axial force to both ends of the axial direction of the shaft parts.

[0004] However, for example, Chinese invention patent CN104713708B discloses a spindle fatigue test device, but the test device only applies an axial force load to the large end of the shaft through an actuator, while no load is applied to the small end of the shaft. Therefore, the test device cannot truly simulate the load state of shaft parts during operation, and the test results are unreliable. Summary of the invention

[0005] The present invention provides a shaft parts fatigue test device to solve the technical problems that the existing fatigue test device cannot truly simulate the load state of the shaft parts and the test results are difficult to fully reflect the reality.

[0006] According to one aspect of the present invention, there is provided a fatigue testing device for shaft parts, comprising a first fixing assembly for radially limiting the axial first end of the test shaft, a second fixing assembly for radially and axially limiting the axial second end of the test shaft, a first loading assembly for connecting the axial first end of the test shaft, a second loading assembly for connecting the axial second end of the test shaft, a torque transmission mechanism connected to the first loading assembly, and a third fixing assembly for connecting to the end of the torque transmission mechanism away from the test shaft to fix the torque transmission mechanism, the first loading assembly being used to apply axial force to the axial first end of the test shaft, the second loading assembly being used to apply axial force, torque, lateral force and rotational bending moment to the axial second end of the test shaft, the torque transmission mechanism being used to transmit torque and stop transmitting axial force, lateral force and rotational bending moment.

[0007] As a further improvement of the above technical solution:

[0008] Furthermore, the first loading assembly includes a simulation disk 1 for connecting to the first axial end of the test shaft and a loading cylinder 1 connected to the simulation disk 1 for applying axial force.

[0009] Furthermore, the torque transmission mechanism includes a ball slot inner shaft connected to the loading cylinder, a ball slot outer shaft sleeved outside the ball slot inner shaft and maintaining a preset radial gap with the ball slot inner shaft, a plurality of torque transmission balls axially arranged between the ball slot inner shaft and the ball slot outer shaft, a ball pressure plate arranged on the ball slot outer shaft and axially corresponding to the torque transmission balls and maintaining a preset axial gap, and a diaphragm structure connected to the ball slot outer shaft, and the preset radial gap is larger than the diameter of the torque transmission balls.

[0010] Furthermore, the diaphragm structure includes a plurality of diaphragm groups connected in sequence along the axial direction, and the diaphragm group at the first axial end is connected to the outer shaft of the ball groove, and the diaphragm group at the second axial end is connected to the third fixing component.

[0011] Furthermore, the diaphragm group includes a torque-transmitting diaphragm and a connecting shaft connected to the torque-transmitting diaphragm.

[0012] Furthermore, the second loading assembly includes a simulation disk 2 for connecting to the second axial end of the test shaft, a torque loading disk connected to the simulation disk 2 for applying torque, and a loading member connected to the simulation disk 2 for applying axial force, lateral force and rotational bending moment.

[0013] Furthermore, the loading member includes a transmission tube connected to the simulation disk 2, a loading tube 2 connected to the transmission tube for applying lateral force, and a loading portion connected to the axial end of the transmission tube away from the simulation disk 2 for applying lateral force and synchronously applying rotational bending moment.

[0014] Furthermore, the torque loading disc includes a loading disc body and two loading force couples respectively arranged at opposite ends of the loading disc body.

[0015] The first fixing assembly includes a bearing seat 1 for connecting the axial first end of the test shaft, a fixing plate 1 connected to the bearing seat 1, and two fixing seats 1 respectively connected to the opposite ends of the fixing plate 1.

[0016] Furthermore, the second fixing assembly includes a bearing seat 2 for connecting to the second axial end of the test shaft, a fixing plate 2 connected to the bearing seat 2, and two fixing seats 2 respectively connected to opposite ends of the fixing plate 2.

[0017] The present invention has the following beneficial effects:

[0018] The shaft parts fatigue testing device of the present invention firstly radially limits the axial first end of the tested shaft by a first fixing component, and then radially and axially limits the axial second end of the tested shaft by a second fixing component, so as to realize the constraint and fixation of the tested shaft, and then applies axial force to the axial first end of the tested shaft by a first loading component, applies axial force, torque, lateral force and rotational bending moment to the axial second end of the tested shaft by a second loading component, and finally transmits torque by a torque transmission mechanism, stops transmitting axial force, lateral force and rotational bending moment, and simultaneously fixes the end of the torque transmission mechanism away from the tested shaft by a third fixing component, so as to realize torque stopping after torque transmission, so that the tested shaft While bearing torque, lateral force and rotational bending moment, both axial ends of the test shaft bear axial force, which truly simulates the load state of the test shaft in the aircraft engine, thereby improving the reliability of the test results and providing test support for verifying the safe life of the test shaft. This solution completes the fatigue test of the test shaft through the coordinated cooperation of the first fixing component, the first loading component, the second fixing component, the second loading component, the torque transmission mechanism and the third fixing component. Compared with the existing technology, this solution truly simulates the load state of the test shaft when it is working. The test results are highly reliable, can fully reflect the actual working conditions, can effectively verify the safe life of the test shaft, are highly practical, and are suitable for wide promotion and application.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. 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:

[0021] Figure 1 It is a structural schematic diagram of a shaft parts fatigue testing device according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 AA section schematic diagram of the fatigue testing device for shaft parts shown;

[0023] Figure 3 yes Figure 2 The diagram shows the partial structure of the fatigue testing device for shaft parts.

[0024] Legend:

[0025] 10. First fixed component; 11. Bearing seat one; 12. Fixed plate one; 20. Second fixed component; 21. Bearing seat two; 22. Fixed plate two; 30. First loading component; 31. Simulation disk one; 32. Loading cylinder one; 40. Second loading component; 41. Simulation disk two; 42. Torque loading disk; 43. Transmission cylinder; 44. Loading cylinder two; 45. Loading part; 50. Torque transmission mechanism; 51. Ball slot inner shaft; 52. Ball slot outer shaft; 53. Torque transmission ball; 54. Ball pressure plate; 55. Torque transmission diaphragm; 56. Connecting shaft; 60. Third fixed component; 61. Fixed plate three. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatus.

[0028] like Figure 1 and Figure 2 As shown, the fatigue testing device for shaft parts of this embodiment includes a first fixing component 10 for radially limiting the axial first end of the test shaft, a second fixing component 20 for radially and axially limiting the axial second end of the test shaft, a first loading component 30 for connecting the axial first end of the test shaft, a second loading component 40 for connecting the axial second end of the test shaft, a torque transmission mechanism 50 connected to the first loading component 30, and a third fixing component 60 for connecting to the end of the torque transmission mechanism 50 away from the test shaft to fix the torque transmission mechanism 50, the first loading component 30 is used to apply axial force to the axial first end of the test shaft, the second loading component 40 is used to apply axial force, torque, lateral force and rotational bending moment to the axial second end of the test shaft, the torque transmission mechanism 50 is used to transmit torque and stop transmitting axial force, lateral force and rotational bending moment.

[0029] like Figure 1 and Figure 2As shown, specifically, the shaft parts fatigue testing device of the present invention firstly radially limits the axial first end of the test shaft by the first fixing component 10, and then radially and axially limits the axial second end of the test shaft by the second fixing component 20, so as to realize the constraint fixation of the test shaft, and then applies axial force to the axial first end of the test shaft by the first loading component 30, and applies axial force, torque, lateral force and rotational bending moment to the axial second end of the test shaft by the second loading component 40, and finally transmits torque by the torque transmission mechanism 50, and stops transmitting axial force, lateral force and rotational bending moment, and at the same time fixes the torque transmission mechanism 50 away from the end of the test shaft by the third fixing component 60, so as to realize torque stopping after the torque is transmitted, so that While the test shaft is subjected to torque, lateral force and rotational bending moment, both axial ends of the test shaft are subjected to axial force, which truly simulates the load state of the test shaft in the aircraft engine, thereby improving the reliability of the test results and providing test support for verifying the safe life of the test shaft; this solution completes the fatigue test of the test shaft through the coordinated cooperation of the first fixing component 10, the first loading component 30, the second fixing component 20, the second loading component 40, the torque transmission mechanism 50 and the third fixing component 60. Compared with the prior art, this solution truly simulates the load state of the test shaft when it is working, the test result has high reliability, can fully reflect the actual working conditions, can effectively verify the safe life of the test shaft, has strong practicality, and is suitable for wide promotion and application.

[0030] Optionally, in this embodiment, the tested axis is arranged vertically, and the second fixing assembly 20 is located below the tested axis to limit the vertical downward movement of the tested axis.

[0031] like Figure 2 As shown, in this embodiment, the first loading assembly 30 includes a simulation disk 131 for connecting the axial first end of the test shaft and a loading cylinder 132 connected to the simulation disk 131 for applying axial force. Specifically, after the simulation disk 131 is connected to the test shaft, the simulation disk 131 and the loading cylinder 132 are connected, and the loading cylinder 132 applies a uniform axial force to the axial first end of the test shaft through the simulation disk 131, so that the axial first end of the test shaft bears the axial force, meets the test requirements of the fatigue test, and improves the reliability of the test results. Optionally, the simulation disk 131 and the loading cylinder 132 are connected by bolts, and a stopper is designed for centering.

[0032] It should be understood that, in this embodiment, the axial force, torque, lateral force and rotational bending moment may be applied directly by a component or indirectly through the component.

[0033] like Figure 2As shown, in this embodiment, the torque transmission mechanism 50 includes a ball slot inner shaft 51 connected to the loading cylinder 32, a ball slot outer shaft 52 sleeved outside the ball slot inner shaft 51 and maintaining a preset radial gap with the ball slot inner shaft 51, a plurality of torque transmission balls 53 arranged axially between the ball slot inner shaft 51 and the ball slot outer shaft 52, a ball pressure plate 54 arranged on the ball slot outer shaft 52 and axially corresponding to the torque transmission balls 53 and maintaining a preset axial gap, and a diaphragm structure connected to the ball slot outer shaft 52, and the preset radial gap is greater than the diameter of the torque transmission balls 53.

[0034] like Figure 2 As shown, specifically, the torque-transmitting ball 53 is installed through the ball groove inner shaft 51 and the ball groove outer shaft 52 to minimize the influence of friction and ensure that no axial force is transmitted; a preset radial gap is maintained by the ball groove inner shaft 51 and the ball groove outer shaft 52, and the preset radial gap is made larger than the diameter of the torque-transmitting ball 53 to allow the torque-transmitting ball 53 to move radially, and then the torque-transmitting ball 53 is axially constrained by a ball pressure plate 54 installed on the ball groove outer shaft 52 and arranged axially corresponding to the torque-transmitting ball 53, and the ball pressure plate 54 and the torque-transmitting ball 53 maintain a preset axial gap to allow The twisting ball 53 can move axially, thereby ensuring that the outer shaft 52 of the ball slot can move synchronously with the bending deformation of the test shaft after being subjected to lateral force and rotational bending moment, so that no other loads other than torque are transmitted, ensuring that the outer shaft 52 of the ball slot only transmits torque; and then a diaphragm structure is used to stop the torque. On the one hand, the axial stiffness and bending stiffness of the diaphragm structure are very low, and on the other hand, the diaphragm structure has a certain flexibility, so the diaphragm structure can buffer the axial force, lateral force and rotational bending moment through elastic deformation, and can meet the application of vibration torque in torque, so as to increase the test loading frequency and meet the test requirements. It should be understood that the diaphragm structure meets the application of vibration torque on the one hand, and achieves torque prevention on the other hand.

[0035] like Figure 3 As shown, d1 = preset radial clearance minus the diameter of the torque-transmitting sphere 53 , which is the radial movable amount of the torque-transmitting sphere 53 ; d2 = preset axial clearance, which is the axial movable amount of the torque-transmitting sphere 53 .

[0036] like Figure 2 As shown, in this embodiment, the diaphragm structure includes a plurality of diaphragm groups connected in sequence along the axial direction, and the diaphragm group at the first axial end is connected to the ball groove outer shaft 52, and the diaphragm group at the second axial end is connected to the third fixing assembly 60. Specifically, multiple elastic buffers are realized through the plurality of diaphragm groups to stop the transmission of axial force, lateral force and rotational bending moment to the greatest extent, and to meet the application of vibration torque.

[0037] like Figure 2 As shown, optionally, in this embodiment, there are two diaphragm groups. In other embodiments, the number of diaphragm groups can be set according to the torque load value.

[0038] like Figure 2 As shown, in this embodiment, the diaphragm group includes a torque transmission diaphragm 55 and a connecting shaft 56 connected to the torque transmission diaphragm 55. Specifically, the torque transmission diaphragm 55 satisfies the application of vibration torque, and then the connecting shaft 56 connects the torque transmission diaphragm 55 and transmits torque.

[0039] like Figure 2 As shown, in this embodiment, the third fixing assembly 60 includes a fixing plate three 61 for connecting the connecting shaft 56, and two fixing seats three respectively connected to the opposite ends of the fixing plate three 61, so as to achieve reliable fixation of the connecting shaft 56 through the fixing plate three 61 and the two fixing seats three, and finally achieve anti-twist.

[0040] It should be understood that the thickness of the torque transmission diaphragm 55 can be adjusted according to the torque load value so that the preset axial clearance can be used to follow the axial position of the ball slot inner shaft 51 and the ball slot outer shaft 52 without changing the assembly position of the third fixing component 60.

[0041] like Figure 2 As shown, in this embodiment, the second loading assembly 40 includes a simulation disk 2 41 for connecting the axial second end of the test shaft, a torque loading disk 42 connected to the simulation disk 2 41 for applying torque, and a loading member connected to the simulation disk 2 41 for applying axial force, lateral force and rotational bending moment. Specifically, the torque loading disk 42 and the loading member are installed through the simulation disk 2 41, so that the torque is applied to the axial second end of the test shaft through the torque loading disk 42, and then the axial force, lateral force and rotational bending moment are applied to the axial second end of the test shaft through the loading member, so as to meet the requirements of the fatigue test of the test shaft.

[0042] like Figure 2 As shown, in this embodiment, the loading member includes a transmission tube 43 connected to the simulation disk 2 41, a loading tube 2 44 connected to the transmission tube 43 for applying a lateral force, and a loading part 45 connected to the axial end of the transmission tube 43 away from the simulation disk 2 41 for applying a lateral force and synchronously applying a rotational bending moment. Specifically, the rotational bending moment is achieved by axially translating the lateral force relative to the center of mass of the second end of the test shaft, that is, while the lateral force is applied to the second end of the test shaft by the loading part 45, the rotational bending moment can be applied synchronously because the loading part 45 is axially away from the second end of the test shaft, so that the number of loading channels for the rotational bending moment can be reduced, the load coordination problem caused by applying the rotational bending moment alone is avoided, and the test loading frequency is further increased.

[0043] like Figure 2As shown, in this embodiment, the torque loading disc 42 includes a loading disc body and two loading force couples respectively arranged at opposite ends of the loading disc body. Specifically, the loading disc body is mounted on the simulation disc 2 41, and two loading force couples are mounted through the loading disc body, so that the two loading force couples act together to apply a torque to the second end of the test shaft, and the torque includes a vibration torque.

[0044] like Figure 2 As shown, in this embodiment, the first fixing assembly 10 includes a bearing seat 11 for connecting the first axial end of the tested shaft, a fixing plate 12 connected to the bearing seat 11, and two fixing seats 1 connected to opposite ends of the fixing plate 12. Specifically, the bearing seat 11 radially limits the first axial end of the tested shaft, and then the fixing plate 12 and the two fixing seats 1 reliably fix the bearing seat 11 to realize the constraint and fixation of the tested shaft. Optionally, the bearing seat 11 and the fixing plate 12 are connected by bolts.

[0045] like Figure 2 As shown, in this embodiment, the second fixing assembly 20 includes a bearing seat 21 for connecting the axial second end of the tested shaft, a fixing plate 22 connected to the bearing seat 21, and two fixing seats 2 respectively connected to the opposite ends of the fixing plate 22. Specifically, the axial second end of the tested shaft is radially limited and axially limited by the bearing seat 21, and the bearing seat 21 is reliably fixed by the fixing plate 22 and the two fixing seats 2 to realize the constraint and fixation of the tested shaft. Optionally, the bearing seat 21 is connected to the fixing plate 22 by bolts.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment, the working principle of the shaft parts fatigue test device is as follows:

[0047] The tested shaft is constrained and fixed by a bearing seat 11 and a bearing seat 21. The bearing seat 11 is constrained and fixed by a fixing plate 12 and two fixing seats 1. The bearing seat 21 is constrained and fixed by a fixing plate 22 and two fixing seats 2.

[0048] The first end of the tested shaft is subjected to an axial force by the first loading assembly 30, wherein the loading cylinder 1 32, the simulation disk 1 31 and the inner shaft 51 of the ball groove are connected by bolts and are designed with a stopper for centering, and the axial force applied by the loading cylinder 1 32 is transmitted to the first end of the tested shaft through the simulation disk 1 31;

[0049] The second end of the test shaft is applied with axial force, torque (including vibration torque), lateral force and rotational bending moment through the second loading assembly 40, wherein the simulation disk 2 41, the torque loading disk 42 and the loading member are connected by bolts, the transmission tube 43, the second loading tube 44 and the loading part 45 are connected by bolts, the torque is applied by the two loading force couples on the torque loading disk 42, the axial force is applied by the second loading tube 44, and the lateral force and rotational bending moment are applied by the loading part 45 in cooperation with the transmission tube 43;

[0050] A torque transmission ball 53 is installed between the ball slot inner shaft 51 and the ball slot outer shaft 52 to transmit torque. The torque transmission ball 53 is axially constrained by a ball pressure plate 54 to ensure that the torque transmission ball 53 is not squeezed out. The torque transmission ball 53 is used to connect the ball slot inner shaft 51 and the ball slot outer shaft 52 to minimize the influence of friction and ensure that no axial force is transmitted.

[0051] The preset radial clearance between the ball slot inner shaft 51 and the ball slot outer shaft 52 is larger than the diameter of the torque transmission ball 53, so the torque transmission ball 53 can move radially. There is a preset axial clearance between the ball pressure plate 54 and the torque transmission ball 53, so the torque transmission ball 53 can move axially, so as to ensure that the ball slot outer shaft 52 can move synchronously with the bending deformation after the first end of the tested shaft is subjected to the lateral force and the rotational bending moment, and will not transmit other loads other than the torque, so that the ball slot outer shaft 52 can only transmit the torque. On the other hand, the thickness of the torque transmission diaphragm 55 can be adjusted according to the torque load value, and the preset axial clearance can be retained to follow the axial outward placement of the ball slot inner shaft 51 and the ball slot outer shaft 52 without changing the assembly position of the fixing plate 3 61.

[0052] There are two diaphragm groups, which are arranged vertically, wherein the ball groove outer shaft 52, the torque transmission diaphragm 55 at the lower end and the connecting shaft 56 are connected by a pin, the connecting shaft 56 at the lower end, the torque transmission diaphragm 55 at the upper end and the connecting shaft 56 are connected by a pin, and the connecting shaft 56 at the upper end and the fixing plate three 61 are connected by bolts. The diaphragm structure is used for torque prevention. On the one hand, the diaphragm structure has very low axial stiffness and bending stiffness. On the other hand, the diaphragm structure has a certain flexibility, which can meet the application of vibration torque and increase the test loading frequency.

[0053] It should be noted that the above-mentioned fatigue test equipment for shaft parts has been successfully used in fatigue tests of shaft parts in various types of aircraft engines. The number of low-cycle cycles has been completed 12,000 times, and the number of high-cycle cycles has been completed 10 million times. The test loading accuracy meets the test requirements, which has contributed to the smooth progress of the development of this model and can be extended to other shaft tests.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fatigue testing device for shaft parts, characterized in that: The invention comprises a first fixing assembly (10) for radially limiting the axial first end of the test shaft, a second fixing assembly (20) for radially and axially limiting the axial second end of the test shaft, a first loading assembly (30) for connecting the axial first end of the test shaft, a second loading assembly (40) for connecting the axial second end of the test shaft, a torque transmission mechanism (50) connected to the first loading assembly (30), and a third fixing assembly (60) for connecting to the end of the torque transmission mechanism (50) away from the test shaft to fix the torque transmission mechanism (50), wherein the first loading assembly (30) is used to apply an axial force to the axial first end of the test shaft, the second loading assembly (40) is used to apply an axial force, a torque, a lateral force and a rotational bending moment to the axial second end of the test shaft, and the torque transmission mechanism (50) is used to transmit the torque and stop transmitting the axial force, the lateral force and the rotational bending moment; The first loading assembly (30) comprises a simulation disk (31) for connecting to the first axial end of the test shaft and a loading cylinder (32) connected to the simulation disk (31) for applying an axial force; The torque transmission mechanism (50) comprises a ball groove inner shaft (51) connected to a loading cylinder (32), a ball groove outer shaft (52) sleeved outside the ball groove inner shaft (51) and maintaining a preset radial gap with the ball groove inner shaft (51), a plurality of torque transmission balls (53) arranged axially between the ball groove inner shaft (51) and the ball groove outer shaft (52), a ball pressure plate (54) arranged on the ball groove outer shaft (52) and correspondingly arranged axially with the torque transmission balls (53) and maintaining a preset axial gap, and a diaphragm structure connected to the ball groove outer shaft (52), wherein the preset radial gap is greater than the diameter of the torque transmission balls (53).

2. The shaft parts fatigue testing device according to claim 1, characterized in that: The diaphragm structure comprises a plurality of diaphragm groups connected in sequence along the axial direction, wherein the diaphragm group at the first axial end is connected to the ball groove outer shaft (52), and the diaphragm group at the second axial end is connected to the third fixing component (60).

3. The shaft parts fatigue testing device according to claim 2, characterized in that: The diaphragm assembly comprises a torque transmission diaphragm (55) and a connecting shaft (56) connected to the torque transmission diaphragm (55).

4. The shaft parts fatigue testing device according to any one of claims 1 to 3, characterized in that: The second loading assembly (40) comprises a simulation disk 2 (41) for connecting to the second axial end of the test shaft, a torque loading disk (42) connected to the simulation disk 2 (41) for applying torque, and a loading member connected to the simulation disk 2 (41) for applying axial force, lateral force and rotational bending moment.

5. The shaft parts fatigue testing device according to claim 4, characterized in that: The loading member includes a transmission tube (43) connected to the simulation disk 2 (41), a loading tube 2 (44) connected to the transmission tube (43) for applying a lateral force, and a loading portion (45) connected to the axial end of the transmission tube (43) away from the simulation disk 2 (41) for applying a lateral force and synchronously applying a rotational bending moment.

6. The shaft parts fatigue testing device according to claim 4, characterized in that: The torque loading disc (42) comprises a loading disc body and two loading force couples respectively arranged at two opposite ends of the loading disc body.

7. The shaft parts fatigue testing device according to any one of claims 1 to 3, characterized in that: The first fixing assembly (10) comprises a bearing seat (11) for connecting the first axial end of the test shaft, a fixing plate (12) connected to the bearing seat (11), and two fixing seats (1) respectively connected to opposite ends of the fixing plate (12).

8. The shaft parts fatigue testing device according to any one of claims 1 to 3, characterized in that: The second fixing assembly (20) comprises a bearing seat 2 (21) for connecting the second axial end of the test shaft, a fixing plate 2 (22) connected to the bearing seat 2 (21), and two fixing seats 2 respectively connected to opposite ends of the fixing plate 2 (22).

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