Transmission shaft loading device

Abstract

The invention relates to the technical field of aero-engine speed reducer and transmission system tests, and discloses a transmission shaft loading device which comprises a force transmission assembly connected with the front end of a transmission shaft, and the front end of the transmission shaft is suitable for serving as a power input end; the radial loading assembly applies a radial load Fr in the z-axis direction to the transmission shaft through the force transmission assembly. The axial loading assembly applies an axial load Fx in the x-axis direction to the transmission shaft through the force transmission assembly; the radial loading assembly and the axial loading assembly apply a bending moment load My around the y-axis direction to the transmission shaft through the force transmission assembly. According to the technical scheme, the radial load, the axial load and the bending moment load borne by the transmission shaft can be effectively simulated. According to the transmission shaft loading device, the load states of a turboprop engine speed reducer and a tilting main speed reducer of a tilting rotorcraft transmission system in a horizontal working condition in actual work can be truly simulated, and when the speed reducer is subjected to a simulation operation test, the real performance of the speed reducer is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of aeroengine reducer and transmission system tests, and particularly relates to a drive shaft loading device. Background Art

[0002] The propeller load of a turboprop engine comes from the propeller shaft; the rotor load of a tiltrotor aircraft in the horizontal flight condition comes from the rotor shaft. The axial force, radial force, and bending moment generated by the propeller or rotor load are all transmitted to the reducer casing through the propeller shaft or rotor shaft, and then act on the engine. In previous ground tests, the axial force, radial force, and bending moment were mainly examined in the static fatigue tests of the reducer casing and the propeller shaft or rotor shaft; during actual flight, the propeller shaft or rotor shaft respectively bears various propeller or rotor loads. Although the above static fatigue tests can also examine the fatigue strength of the propeller shaft or rotor shaft when bearing the propeller or rotor load respectively, it is difficult to examine the true load state of the propeller shaft or rotor shaft during actual operation. Summary of the Invention

[0003] In view of this, the present invention provides a drive shaft loading device to solve the problem that in the existing static fatigue tests of the reducer casing and the propeller shaft or rotor shaft, only the fatigue strength of the propeller shaft or rotor shaft when bearing the propeller or rotor load respectively can be examined, but it is difficult to examine the true load state of the propeller shaft or rotor shaft during actual operation.

[0004] The present invention provides a drive shaft loading device, where the drive shaft is: a propeller shaft or a rotor shaft; and the drive shaft is arranged along the horizontal flight direction. The drive shaft loading device includes:

[0005] A force transmission assembly, connected to the front end of the drive shaft; the front end of the drive shaft is adapted to be the input end of power;

[0006] A radial loading assembly, applying a radial load F in the z-axis direction to the drive shaft through the force transmission assembly r ; the actual radial load F in the z-axis direction received by the drive shaft z is calculated according to formula (1),

[0007] F z = G - F r (1)

[0008] wherein, G is the gravity of the force transmission assembly;

[0009] An axial loading assembly, applying an axial load F in the x-axis direction to the drive shaft through the force transmission assembly x ; the radial loading assembly and the axial loading assembly apply a bending moment load M in the y-axis direction to the drive shaft through the force transmission assembly y ;

[0010] Wherein, the x-axis is arranged along the horizontal flight direction, with the front in the course direction and the rear in the reverse course direction; the z-axis is arranged along the vertical direction, and the y-axis is perpendicular to both the x-axis and the z-axis. Beneficial effects: By adopting the above technical solution, the present application can effectively evaluate the radial load, axial load and bending moment load on the transmission shaft. The transmission shaft loading device of the present application can truly simulate the load state of the reduction gear of a turboprop engine or the tilting main reduction gear of a tiltrotor aircraft transmission system in a horizontal working condition during the actual operation, and obtain the true performance of the reduction gear when conducting a simulation operation test on the reduction gear.

[0011] Optionally, the force transmission assembly includes:

[0012] A loading shaft unit, connected to the front end of the transmission shaft;

[0013] A force transmission casing, with a part of the loading shaft unit sleeved inside the force transmission casing;

[0014] The axial loading assembly includes:

[0015] Two axial force application units, respectively connected to positions at the upper and lower parts of the force transmission casing; the two axial force application units are adapted to apply an axial load F along the x-axis direction to the transmission shaft through the force transmission assembly x ; the distances between the center lines of the acting forces applied by the two axial force application units and the central axis of the transmission shaft are both R; assuming that the axial force application unit located at the upper part applies a load F U to the transmission shaft, and the axial force application unit located at the lower part applies a load F D to the transmission shaft, then the axial load F x is calculated according to Equation (2),

[0016] F x = F U+ F D (2)

[0017] The radial loading assembly is connected to the upper part of the force transmission casing; the distance between the center line of the acting force applied by the radial loading assembly and the front end face of the propeller shaft or the hub center plane of the rotor shaft is L; the center lines of the acting forces applied by the two axial force application units and the center line of the acting force applied by the radial loading assembly are in the same plane; the radial loading assembly and the two axial force application units are jointly adapted to apply a bending moment load M around the y-axis direction to the transmission shaft y ; the bending moment load M y is calculated according to Equation (3),

[0018] M y = (F D - F U ) × R + (Fr -G)×L (3).

[0019] Beneficial effects: By adopting the above technical solution, the present application can effectively simulate the bending moment load received by the transmission shaft.

[0020] Optionally, it further includes:

[0021] Two balance components, which are respectively connected to the positions on the left and right sides of the force transmission casing through vertical tie rod units; the two balance components are adapted to apply an upward load to offset the gravity of the force transmission component. Beneficial effects: By adopting the above technical solution, the present application eliminates the influence of the gravity of the force transmission component through the balance component, making the load assessment of the transmission shaft more accurate.

[0022] Optionally, the radial loading component is a radial oil cylinder unit, and the radial oil cylinder unit is adapted to apply a tensile force or a thrust force along the z-axis direction; the axial force application unit is an axial oil cylinder unit, and the axial oil cylinder unit is adapted to apply a tensile force or a thrust force along the x-axis direction.

[0023] Optionally, the loading shaft unit includes:

[0024] A first flange, which consists of a disc-shaped part and an extension part, and the disc-shaped part is fixedly connected to the disc-shaped structure provided at the front end of the transmission shaft;

[0025] A second flange, which consists of a disc-shaped part and an extension part;

[0026] A loading shaft, one end of which is sleeved inside the first flange. An annular inclined surface bayonet is provided on the inner wall at one end of the extension part of the first flange, and a conical ring matched with the inclined surface bayonet is fixed inside the inclined surface bayonet. A pressing ring and the extension part of the first flange are connected and tightened through a first fastener, so as to press and fix the conical ring inside the inclined surface bayonet through the pressing ring; the other end of the loading shaft is sleeved inside the extension part of the second flange. An annular clamping table is provided on the inner wall of the second flange, and the annular clamping table presses the pressure ring towards the direction close to the transmission shaft, and the second flange and the pressure ring are fixed to the other end of the loading shaft through a plurality of second fasteners. Beneficial effects: By adopting the above technical solution, the present application can reduce the assembly difficulty of the loading shaft unit.

[0027] Optionally, the first flange and the transmission shaft are fixedly connected through a plurality of threaded fasteners and a plurality of locking nuts.

[0028] Optionally, the force transmission casing is sleeved on the loading shaft through a bearing structure.

[0029] Optionally, the bearing structure includes:

[0030] The four-point contact ball bearing is arranged at one end of the force transmission casing close to the transmission shaft. The inner ring end face on the side of the four-point contact ball bearing away from the transmission shaft abuts against the first shoulder provided on the loading shaft, and the outer ring end face on the side of the four-point contact ball bearing away from the transmission shaft abuts against the first annular step provided in the force transmission casing;

[0031] The first roller bearing, the end face on the side away from the transmission shaft abuts against one end of the four-point contact ball bearing close to the transmission shaft;

[0032] The second roller bearing is arranged at one end of the force transmission casing away from the transmission shaft; the inner ring end face on the side of the second roller bearing close to the transmission shaft abuts against the second shoulder provided on the loading shaft, and the outer ring end face on the side of the second roller bearing close to the transmission shaft abuts against the second annular step provided in the force transmission casing.

[0033] Optionally, it is threadedly sleeved on the loading shaft through a slotted nut, and in combination with a lock washer to press and fix the inner ring of the first roller bearing; the outer end cover is sleeved on the loading shaft to enclose and protect the four-point contact ball bearing and the first roller bearing; the end face on the side of the outer end cover away from the transmission shaft abuts against the outer ring of the first roller bearing; the bearing end cover is sleeved on the extension of the second flange to enclose and protect the second roller bearing; the end face on the side of the bearing end cover close to the transmission shaft abuts against the outer ring of the second roller bearing; the end face of the extension of the second flange abuts against the inner ring of the second roller bearing.

[0034] Optionally, the outer end cover and the end face of the force transmission casing close to the transmission shaft are fixedly connected through a plurality of third fasteners to enclose and protect the slotted nut; the bearing end cover and the end face of the force transmission casing away from the transmission shaft are fixedly connected through a plurality of fourth fasteners; a first lip seal is provided between the outer end cover and the loading shaft, and a second lip seal is provided between the bearing end cover and the extension of the second flange. Description of the Drawings

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a three-dimensional structural schematic diagram of the transmission shaft loading device provided in the embodiment of the present invention;

[0037] Figure 2 Schematic cross-sectional structure of the drive shaft loading device provided in the embodiment of the present invention Figure 1 ;

[0038] Figure 3 Schematic cross-sectional structure of the drive shaft loading device provided in the embodiment of the present invention Figure 2 ;

[0039] Figure 4 Schematic diagram of applying a load to the drive shaft in the embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the drive shaft loading device applying a bending moment load M in the y-axis direction to the drive shaft in the embodiment of the present invention y ;

[0041] Figure 6 Schematic cross-sectional structure diagram of the paddle shaft provided in the embodiment of the present invention;

[0042] Figure 7 Schematic cross-sectional structure diagram of the rotor shaft provided in the embodiment of the present invention.

[0043] Explanation of reference numerals:

[0044] 1. Force transmission component; 2. Force transmission casing; 3. Loading shaft unit; 4. First flange; 5. Loading shaft; 6. First roller bearing; 7. Stop washer; 8. Grooved nut; 9. Four-point contact ball bearing; 10. Second roller bearing; 11. Pressure ring; 12. First fastener; 13. Second fastener; 14. Compression ring; 15. Taper ring; 16. Locking nut; 17. Threaded fastener; 18. First lip seal; 19. Outer end cover; 20. Bearing end cover; 21. Second lip seal; 22. Balance component; 23. Vertical tie rod unit; 24. Radial loading component; 25. Second flange; 26. Axial loading component; 27. Axial force application unit; 28. Paddle shaft; 29. Rotor shaft. Detailed implementation manners

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0046] As Figures 1 to 7A specific embodiment of the drive shaft loading device shown includes: a force transmission component 1, a radial loading component 24, and an axial loading component 26. The drive shaft is: a propeller shaft 28 or a rotor shaft 29; the drive shaft is arranged along the horizontal flight direction.

[0047] In the tests of the drive shaft loading device of the present application in a turboprop engine reducer or a tilt main reducer of a tiltrotor aircraft transmission system in a horizontal working condition, it is used to respectively load the propeller shaft 28 or the rotor shaft 29 pre-installed on the turboprop engine reducer or the tilt main reducer of the tiltrotor aircraft transmission system in a horizontal working condition to simulate the propeller load or the rotor load, so as to conduct a simulated running test on the reducer. The radial loading component 24 and the axial loading component 26 can be in the form of loading arms.

[0048] As Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, the force transmission component 1 is connected to the flange end of the propeller shaft 28 or the rotor shaft 29; the flange end of the propeller shaft 28 or the rotor shaft 29 is adapted to be the input end of power. The radial loading component 24 applies a radial load F in the z-axis direction to the propeller shaft 28 or the rotor shaft 29 through the force transmission component 1 r ; the actual radial load F in the z-axis direction received by the propeller shaft 28 or the rotor shaft 29 z is calculated according to Equation (1),

[0049] F z = G - F r (1)

[0050] wherein, G is the gravity of the entire force transmission component 1.

[0051] The axial loading component 26 applies an axial load F in the x-axis direction to the propeller shaft 28 or the rotor shaft 29 through the force transmission component 1 x . The radial loading component 24 and the axial loading component 26 apply a bending moment load M in the y-axis direction to the drive shaft through the force transmission component 1 y . Wherein, the x-axis is arranged along the horizontal flight direction, the front is in the course direction, and the rear is in the reverse course direction; the z-axis is arranged along the vertical direction, the y-axis is perpendicular to both the x-axis and the z-axis, and in Figure 4 the arrow on the left represents the course direction.

[0052] Specifically, as Figures 1 to 3 described, the force transmission component 1 includes: a loading shaft unit 3 and a force transmission casing 2. The loading shaft unit 3 is connected to the flange end of the propeller shaft 28 or the rotor shaft 29. The loading shaft unit 3 is partially sleeved inside the force transmission casing 2.

[0053] Specifically, as Figure 2 described, the axial loading assembly 26 includes: two axial force application units 27.

[0054] As Figures 3 to 5 shown, the two axial force application units 27 are respectively connected to positions at the upper and lower parts of the power transmission casing 2; the two axial force application units 27 are adapted to apply an axial load F in the x-axis direction to the propeller shaft 28 or the rotor shaft 29 through the force transmission assembly 1 x ; the distance between the center lines of the forces applied by the two axial force application units 27 and the central axis of the propeller shaft 28 or the rotor shaft 29 is both R; assuming that the axial force application unit 27 located at the upper part applies a load F U to the propeller shaft 28 or the rotor shaft 29, and the axial force application unit 27 located at the lower part applies a load F D to the propeller shaft 28 or the rotor shaft 29, then the axial load F x is calculated according to Equation (2),

[0055] F x = F U+ F D (2)

[0056] As Figure 4 and Figure 5 shown, the radial loading assembly 24 is connected to the upper part of the power transmission casing 2; the distance between the center line of the force applied by the radial loading assembly 24 and the front end face of the propeller shaft 28 or the hub center plane of the rotor shaft 29 is L; the center lines of the forces applied by the two axial force application units 27 and the center line of the force applied by the radial loading assembly 24 are in the same plane; the radial loading assembly 24 and the two axial force application units 27 are jointly adapted to apply a bending moment load M in the y-axis direction to the propeller shaft 28 or the rotor shaft 29 y ; the bending moment load M y is calculated according to Equation (3),

[0057] M y = (F D - F U ) × R + (F r - G) × L (3).

[0058] Furthermore, as Figure 1 and Figure 2 shown, the drive shaft loading device of the present application further includes: two balance assemblies 22. The two balance assemblies 22 are respectively connected to positions on the left and right sides of the power transmission casing 2 through the vertical tie rod units 23; the two balance assemblies 22 are adapted to apply upward loads to offset the gravity of the force transmission assembly 1.

[0059] Specifically, the radial loading component 24 is a radial oil cylinder unit, and the radial oil cylinder unit is adapted to apply a tensile force or a thrust force in the z-axis direction; the axial force applying unit 27 is an axial oil cylinder unit, and the axial oil cylinder unit is adapted to apply a tensile force or a thrust force in the x-axis direction.

[0060] Specifically, as Figure 2 , Figure 3 , Figure 6 and Figure 7 shown, the loading shaft unit 3 includes: a first flange 4, a second flange 25, and a loading shaft 5; the loading shaft 5 is a hollow shaft. The first flange 4 is composed of a disc portion and an extension portion, and the disc portion is fixedly connected to a disc structure provided at the front end of the paddle shaft 28 or the rotor shaft 29; the disc structure is a disc flange structure; specifically, the first flange 4 and the paddle shaft 28 or the rotor shaft 29 are fixedly connected by a plurality of threaded fasteners 17 and a plurality of lock nuts 16; the threaded fasteners 17 can be bolts for reamed holes. The second flange 25 is composed of a disc portion and an extension portion. One end of the loading shaft 5 is sleeved inside the first flange 4, and an annular inclined surface bayonet is provided on the inner wall at one end of the extension portion of the first flange 4. A conical ring 15 that mates with the inclined surface bayonet is fixed inside the inclined surface bayonet. A compression ring 14 and the extension portion of the first flange 4 are connected and pressed by a first fastener 12, so as to press and fix the conical ring 15 inside the inclined surface bayonet through the compression ring 14; the other end of the loading shaft 5 is sleeved inside the extension portion of the second flange 25, and an annular retaining table is provided on the inner wall of the second flange 25. The annular retaining table presses the pressure ring 11 in the direction approaching the paddle shaft 28 or the rotor shaft 29, and the second flange 25 and the pressure ring 11 are fixed to the other end of the loading shaft 5 by a plurality of second fasteners 13.

[0061] Furthermore, as Figure 2 and Figure 3 shown, the transmission casing 2 is sleeved on the loading shaft 5 through a bearing structure.

[0062] Specifically, as Figure 3As shown in the figure, the bearing structure includes: a first roller bearing 6, a four-point contact ball bearing 9, and a second roller bearing 10. The four-point contact ball bearing 9 is arranged at one end of the force transmission casing 2 close to the propeller shaft 28 or the rotor shaft 29. The end face of the four-point contact ball bearing 9 on the side close to the transmission shaft abuts against one end of the first roller bearing 6 away from the propeller shaft 28 or the rotor shaft 29. The inner ring end face of the four-point contact ball bearing 9 on the side away from the transmission shaft abuts against the first shoulder provided on the loading shaft 5. The outer ring end face of the four-point contact ball bearing 9 on the side away from the transmission shaft abuts against the first annular step provided in the force transmission casing 2. The second roller bearing 10 is arranged at one end of the force transmission casing 2 away from the propeller shaft 28 or the rotor shaft 29. The inner ring end face of the second roller bearing 10 on the side close to the transmission shaft abuts against the second shoulder provided on the loading shaft 5. The outer ring end face of the second roller bearing 10 on the side close to the transmission shaft abuts against the second annular step provided in the force transmission casing 2.

[0063] Furthermore, as Figure 3 shown in the figure, a slotted nut 8 is threadedly sleeved on the loading shaft 5 and combined with a lock washer 7 to press and fix the inner ring of the first roller bearing 6. An outer end cover 19 is sleeved on the loading shaft 5 to enclose and protect the four-point contact ball bearing 9 and the first roller bearing 6. The end face of the outer end cover 19 on the side away from the transmission shaft abuts against the outer ring of the first roller bearing 6. A bearing end cover 20 is sleeved on the extension of the second flange 25 to enclose and protect the second roller bearing 10. The end face of the bearing end cover 20 on the side close to the transmission shaft abuts against the outer ring of the second roller bearing 10. The end face of the extension of the second flange 25 abuts against the inner ring of the second roller bearing 10. The outer end cover 19 and the flange end face of the force transmission casing 2 close to the propeller shaft 28 or the rotor shaft 29 are fixedly connected by a plurality of third fasteners to enclose and protect the slotted nut 8. The bearing end cover 20 and the flange end of the force transmission casing 2 away from the propeller shaft 28 or the rotor shaft 29 are fixedly connected by a plurality of fourth fasteners. A first lip seal 18 is provided between the outer end cover 19 and the loading shaft 5, and a second lip seal 21 is provided between the bearing end cover 20 and the extension of the second flange 25.

[0064] In the applicant's unit, after the transmission shaft loading device described in this application is actually simulated for the operation test of a certain type of turboprop engine reducer, it is proved to be feasible. The application results show that the transmission shaft loading device described in this application can effectively simulate the propeller shaft aerodynamic load of the turboprop engine reducer during the operation test, with stable load and fast and convenient installation.

[0065] While embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A drive shaft loading device, wherein the drive shaft is: a paddle shaft (28) or a rotor shaft (29); and the drive shaft is arranged along the horizontal flight direction, characterized in that, Comprising: A force transmission component (1), connected to the front end of the transmission shaft, and the front end of the transmission shaft is adapted to be the input end of power; A radial loading component (24) applies a radial load F in the z-axis direction to the transmission shaft through the force transmission component (1). r The actual radial load F on the transmission shaft in the z-axis direction z is calculated according to Equation (1). F z = G - F r (1) Wherein, G is the gravity of the force transmission component (1); Axial loading component (26), applying an axial load F in the x-axis direction to the transmission shaft through the force transmission component (1) x ; the radial loading component (24) and the axial loading component (26) apply a bending moment load M in the y-axis direction to the transmission shaft through the force transmission component (1) y ; Wherein, the x-axis is arranged along the horizontal flight direction, the front is in the course direction, and the rear is in the reverse course direction; the z-axis is arranged along the vertical direction, and the y-axis is perpendicular to both the x-axis and the z-axis.

2. The drive shaft loading device according to claim 1, wherein The force transmission component (1) includes: A loading shaft unit (3), connected to the front end of the transmission shaft; A force transmission casing (2), with a part of the loading shaft unit (3) sleeved inside the force transmission casing (2); The axial loading component (26) includes: Two axial force application units (27), which are respectively connected to positions at the upper and lower parts of the force transmission casing (2); the two axial force application units (27) are adapted to apply an axial load F in the x-axis direction to the transmission shaft through the force transmission assembly (1) x ; the distances from the center lines of the acting forces applied by the two axial force application units (27) to the central axis of the transmission shaft are both R; assuming that the axial force application unit (27) located at the upper part applies a load F to the transmission shaft U , and the axial force application unit (27) located at the lower part applies a load F to the transmission shaft D , then the axial load F x is calculated according to Equation (2). F x = F U+ F D (2) The radial loading component (24) is connected to the upper part of the force transmission casing (2); the distance between the center line of the force applied by the radial loading component (24) and the front end face of the paddle shaft (28) or the hub center plane of the rotor shaft (29) is L; the center lines of the forces applied by the two axial force application units (27) and the center line of the force applied by the radial loading component (24) are in the same plane; the radial loading component (24) and the two axial force application units (27) together are adapted to apply a bending moment load M in the y-axis direction to the transmission shaft y ; the bending moment load M y is calculated according to Equation (3), M y = (F D - F U ) × R + (F r - G) × L (3).

3. The drive shaft loading device according to claim 2, characterized in that, Further comprising: Two balance components (22), respectively connected to positions on the left and right sides of the force transmission casing (2) through vertical tie rod units (23); the two balance components (22) are adapted to apply upward loads to offset the gravity of the force transmission component (1).

4. The drive shaft loading device according to claim 2 or 3, characterized in that, The radial loading component (24) is a radial oil cylinder unit, and the radial oil cylinder unit is adapted to apply a tensile or thrust force along the z-axis direction; the axial force application unit (27) is an axial oil cylinder unit, and the axial oil cylinder unit is adapted to apply a tensile or thrust force along the x-axis direction.

5. The drive shaft loading device according to claim 2 or 3, characterized in that The loading shaft unit (3) includes: A first flange (4), composed of a disc part and an extension part, and the disc part is fixedly connected to the disc structure arranged at the front end of the transmission shaft; A second flange (25), composed of a disc part and an extension part; A loading shaft (5), with one end sleeved inside the first flange (4). An annular inclined surface bayonet is provided on the inner wall at one end of the extension part of the first flange (4), and a tapered ring (15) matching the inclined surface bayonet is fixed inside the inclined surface bayonet. A compression ring (14) and the extension part of the first flange (4) are connected and tightened through a first fastener (12) to tightly fix the tapered ring (15) inside the inclined surface bayonet through the compression ring (14); the other end of the loading shaft (5) is sleeved inside the extension part of the second flange (25). An annular retaining platform is provided on the inner wall of the second flange (25), and the annular retaining platform presses the pressure ring (11) towards the direction close to the transmission shaft, and the second flange (25) and the pressure ring (11) are fixed to the other end of the loading shaft (5) through a plurality of second fasteners (13).

6. The drive shaft loading device according to claim 5, characterized in that, The first flange (4) and the transmission shaft are fixedly connected through a plurality of threaded fasteners (17) and a plurality of locking nuts (16).

7. The drive shaft loading device according to claim 5, characterized in that, The force transmission casing (2) is sleeved on the loading shaft (5) through a bearing structure.

8. The drive shaft loading device according to claim 7, characterized in that The bearing structure includes: A four-point contact ball bearing (9), arranged at one end of the force transmission casing (2) close to the transmission shaft. The inner ring end face on the side of the four-point contact ball bearing (9) away from the transmission shaft abuts against the first shoulder provided on the loading shaft (5), and the outer ring end face on the side of the four-point contact ball bearing (9) away from the transmission shaft abuts against the first annular step provided inside the force transmission casing (2); A first roller bearing (6), with the end face on the side away from the transmission shaft abutting against the end of the four-point contact ball bearing (9) close to the transmission shaft; The second roller bearing (10) is arranged at one end of the force transmission casing (2) away from the transmission shaft; the inner ring end face of the second roller bearing (10) on the side close to the transmission shaft abuts against the second shoulder provided on the loading shaft (5), and the outer ring end face of the second roller bearing (10) on the side close to the transmission shaft abuts against the second annular step provided in the force transmission casing (2).

9. The drive shaft loading device according to claim 8, wherein, It is threadedly sleeved and connected to the loading shaft (5) through a slotted nut (8), and a lock washer (7) is combined to compress and fix the inner ring of the first roller bearing (6); an outer end cover (19) is sleeved on the loading shaft (5) to enclose and protect the four-point contact ball bearing (9) and the first roller bearing (6); the end face of the outer end cover (19) away from the transmission shaft abuts against the outer ring of the first roller bearing (6); a bearing end cover (20) is sleeved on the extension part of the second flange (25) to enclose and protect the second roller bearing (10); the end face of the bearing end cover (20) close to the transmission shaft abuts against the outer ring of the second roller bearing (10); the end face of the extension part of the second flange (25) abuts against the inner ring of the second roller bearing (10).

10. The drive shaft loading device according to claim 9, characterized in that, The outer end cover (19) and the end face of the force transmission casing (2) close to the transmission shaft are fixedly connected through a plurality of third fasteners to enclose and protect the slotted nut (8); the bearing end cover (20) and the end face of the force transmission casing (2) away from the transmission shaft are fixedly connected through a plurality of fourth fasteners; a first lip seal (18) is provided between the outer end cover (19) and the loading shaft (5), and a second lip seal (21) is provided between the bearing end cover (20) and the extension part of the second flange (25).

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