High-speed transmission shaft torsional fatigue strength detection equipment

Abstract

The invention relates to the technical field of torsion tests, and discloses a high-speed transmission shaft torsion fatigue strength detection device which comprises a workbench, a torsion machine base and a detection machine base arranged on the top of the workbench, and an overload disconnection protection mechanism. The output end of the torsion machine base is in butt joint with a transmission shaft a through an overload disconnection protection mechanism, and the overload disconnection protection mechanism is used for judging the state of the transmission shaft a and disconnecting torsion output when the transmission shaft a is in a torsion bending state to prevent the transmission shaft a from being broken. The overload disconnection protection mechanism is arranged on the basis of traditional detection equipment, state detection is carried out on the transmission shaft a in torsional fatigue strength detection, whether the transmission shaft a of the detection part has a breaking risk or not is predicted, and meanwhile torsion output of the equipment can be rapidly interrupted when it is judged that the transmission shaft a is in an abnormal state; and the torsion applied to the transmission shaft a is released, so that the transmission shaft a in an abnormal state is prevented from being broken due to continuous stress.

Description

Technical Field

[0001] The invention relates to the technical field of torsion testing, and more specifically to a high-speed transmission shaft torsion fatigue strength testing device. Background Art

[0002] The high-speed transmission shaft is a shaft specially used to transmit power. In the automobile transmission system, the high-speed transmission shaft connects the output end of the gearbox and the drive axle (or rear axle), and serves as an important bridge for transmitting engine power to the wheels. In the production process, in order to ensure that the transmission shaft can meet the requirements of long-term, high-speed, and high-load operation, it must be subjected to strict performance tests, among which the torsional fatigue strength test is a key test. Its purpose is to evaluate the durability or fatigue life of the material under torsional load. The detection equipment applies periodic positive and negative alternating torsional loads to the transmission shaft sample, and observes and records whether the sample suffers fatigue damage after a certain number of torsional cycles. Specifically, the deformation, stress distribution, and possible crack generation of the transmission shaft are continuously monitored during the test to evaluate its torsional fatigue strength. The detection equipment is usually composed of a workbench, a torsion machine base, a detection machine base, etc. The torsion machine base is used to connect one end of the transmission shaft and apply torsional force, and the detection machine base is used to connect the other end of the transmission shaft. A torque sensor is provided in the detection machine base to detect the torque size.

[0003] Traditional torsional fatigue strength testing usually involves applying continuous torsional force to the drive shaft and observing its deformation and fracture over several cycles. However, when the drive shaft is about to reach its fatigue limit, sudden fracture may cause damage to the test equipment or injury to the tester, making the operation of the torsional fatigue strength testing equipment a safety hazard. Summary of the invention

[0004] In order to overcome the above defects of the prior art, the present invention provides a high-speed transmission shaft torsional fatigue strength testing device to solve the problem that it is difficult to prevent safety accidents caused by fracture when performing torsional fatigue strength testing on the transmission shaft in the above background technology.

[0005] The present invention provides the following technical solutions: a high-speed transmission shaft torsional fatigue strength testing device, comprising a workbench, a torsion machine base and a detection machine base are arranged on the top of the workbench, the torsion machine base is used to output torque, the detection machine base is used for torque detection, and includes an overload disconnection protection mechanism, the output end of the torsion machine base is connected to the transmission shaft a through the overload disconnection protection mechanism, the overload disconnection protection mechanism is used to determine the state of the transmission shaft a, and disconnect the torque output when the transmission shaft a is in a torsional bending state, so as to prevent the transmission shaft a from breaking; The overload disconnection protection mechanism includes a cylinder shell, which is fixedly connected to one side of the workbench, and a switch coupling is rotatably sleeved inside the cylinder shell. A displacement sensor that penetrates into the interior is installed on the top of the cylinder shell, and the displacement sensor is used to detect the rotation angle of the switch coupling. A support cylinder sleeve is provided on one side of the cylinder shell, and a telescopic coupling is rotatably sleeved in the inner cavity of the support cylinder sleeve. The telescopic end of the telescopic coupling penetrates into the cylinder shell and docks with the output end of the workbench through the switch coupling. The fixed end of the telescopic coupling is connected to the transmission shaft a, and a telescopic mechanism is fixedly installed on the side wall of the workbench, and the telescopic mechanism is used to control the telescopic coupling. The switch coupling is composed of a fixed end component and a movable end component, and the fixed end component and the movable end component are angle-adaptive to ensure that any rotation angle thereof can complete the connection; The movable end assembly cooperates with the cylinder shell to form a rotation damping after the fixed end assembly and the movable end assembly are disconnected to prevent the transmission shaft a from vibrating due to instantaneous torque release.

[0006] Furthermore, the fixed end assembly is composed of a main end tube and a plurality of positioning strips, a column hole is opened at one end of the main end tube, and the plurality of positioning strips are fixedly connected to the inner wall of the column hole of the main end tube; the movable end assembly is composed of an end disc assembly, a middle column, and a plurality of expanded diameter edge blocks, the middle column is fixedly connected on one side of the end disc assembly, and a plurality of expanded diameter edge blocks are fixedly connected on the side wall of the middle column, and a plurality of expanded diameter edge blocks are arranged as slopes b toward one end of the fixed end assembly, and the end disc assembly cooperates with the cylinder shell to form rotational damping.

[0007] Furthermore, one end of the positioning strip is fixedly connected to a conical end head, one end of the conical end head is provided with a hemispherical recess, and a ball is rotatably sleeved in the hemispherical recess.

[0008] Furthermore, the end plate assembly includes a main end plate, the side wall of the main end plate is provided with an annular groove, a retaining ring frame is rotatably sleeved in the annular groove, the circumferential side of the retaining ring frame is provided with a plurality of through-holes penetrating into the inner cavity, damping blocks are slidably sleeved in the plurality of through-holes, the inner wall of the cylinder shell is provided with a plurality of sloped grooves, and the outer ends of the plurality of damping blocks are slidably sleeved in the plurality of sloped grooves respectively.

[0009] Furthermore, an ear chamber is formed on the inner wall of the retaining ring frame, an ear block is fixedly connected to the side wall of the damping block, the ear block is slidably sleeved in the ear chamber, and the ear block is transmission-connected to the inner wall of the ear chamber via a spring.

[0010] Furthermore, the inner end surfaces of some of the damping blocks are set to be frosted surfaces, and the inner end surfaces are set with curvature and match the curvature of the inner wall of the annular groove of the main body end plate.

[0011] Furthermore, the telescopic coupling includes an outer tube and an inner shaft. A dustproof chamber is arranged inside the outer tube, a spline column groove is opened in the dustproof chamber, one end of the inner shaft passes through the dustproof chamber and is connected to a spline column, the spline column is inserted into the spline column groove, and the output end of the telescopic mechanism is connected to the inner shaft.

[0012] Furthermore, the telescopic mechanism includes an electric cylinder, the output end of the electric cylinder is fixedly connected to a connecting disk, the side wall of the inner shaft is provided with an annular positioning groove, the connecting disk is rotatably sleeved in the annular positioning groove, and the displacement of the connecting disk is controlled by the output of the electric cylinder.

[0013] Furthermore, the number of the electric cylinders is more than one, and they are evenly distributed around the central axis of the inner shaft.

[0014] Furthermore, an annular convex frame is provided on the inner wall of the cylinder shell, and an annular positioning groove 2 is opened on the side wall of the fixed end component, and the annular convex frame is embedded in the annular positioning groove 2.

[0015] Technical effects and advantages of the present invention: The present invention sets an overload disconnection protection mechanism on the basis of the traditional detection equipment, and performs state detection on the transmission shaft a in the torsional fatigue strength detection by cooperating with the switch coupling, the telescopic coupling, the telescopic mechanism, and the displacement sensor, so as to predict whether the transmission shaft a of the detection part has the risk of breaking, replace the manual observation method, improve the judgment accuracy and reduce the risk of the transmission shaft a breaking. At the same time, when it is judged that the transmission shaft a is in an abnormal state, the torque output of the equipment can be quickly interrupted, and the torque applied to the transmission shaft a can be released, that is, the fixed end component and the moving end component of the switch coupling are disconnected by the force of the telescopic mechanism and the telescopic coupling, so as to prevent the transmission shaft a from being continuously stressed and broken in an abnormal state, and improve the safety performance of the equipment. The fixed end assembly and the moving end assembly of the switch coupling are also improved in structure. Since the fixed end assembly and the moving end assembly have an asynchronous rotation angle misalignment after disconnection, the structural end plate assembly, the center column, and the expanded diameter edge block of the moving end assembly cooperate with the structural main body end tube and the positioning insert of the fixed end assembly to achieve the angle self-adaptation of the fixed end assembly and the moving end assembly during connection, ensuring accurate connection and reducing human intervention. In addition, the structural end disc assembly of the moving end assembly has been further improved. By retaining the ring frame, the damping block and the sloped groove of the cylinder shell, the moving end assembly can form a rotational damping effect during the disconnection process with the fixed end assembly. The rotational damping effect acts on the transmission shaft a of the detection part to prevent its instantaneous torque release from generating strong vibration force that affects the structure of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a schematic diagram of the explosion of the overload disconnection protection mechanism structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the switch coupling structure in FIG. Figure 4 For the present invention Figure 3 Schematic diagram of the structure of the fixed end component and the moving end component; Figure 5 For the present invention Figure 4 Schematic diagram of the positioning fillet structure; Figure 6 It is a cross-sectional schematic diagram of the structural coordination of the cylinder shell and the end plate assembly of the present invention; Figure 7 For the present invention Figure 4 A schematic side cross-sectional view of the end plate assembly structure; Figure 8 For the present invention Figure 2 Schematic diagram of the telescopic coupling structure; Fig. 9 For the present invention Figure 2 Schematic diagram of the telescopic mechanism structure; Fig.10 For the present invention Figure 2 Schematic diagram of the middle cylinder shell structure.

[0017] The accompanying drawings are marked as follows: 1. workbench; 2. torsion machine base; 3. detection machine base; 4. cylinder shell; 5. switch coupling; 6. telescopic coupling; 7. support cylinder sleeve; 8. telescopic mechanism; 9. displacement sensor; 51. fixed end assembly; 52. moving end assembly; 53. end plate assembly; 54. center column; 55. expansion edge block; 56. main end cylinder; 57. positioning insert; 571. tapered end; 572. ball; 531. main end plate; 532. retaining ring frame; 533. damping block; 534. ear block; 535. spring; 41. slope slide groove; 42. annular convex frame; 61. outer cylinder; 62. inner shaft; 63. spline plug column; 81. electric cylinder; 82. connecting plate. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0019] Reference Figure 1-Figure 3 The present invention provides a high-speed transmission shaft torsional fatigue strength testing device, including a workbench 1, a torsion machine base 2 and a detection machine base 3 are arranged on the top of the workbench 1, the torsion machine base 2 is used to output torque, and the detection machine base 3 is used for torque detection, which is characterized in that: an overload disconnection protection mechanism is included, the output end of the torsion machine base 2 is connected to the transmission shaft a through the overload disconnection protection mechanism, the overload disconnection protection mechanism is used to determine the state of the transmission shaft a, and disconnect the torque output when the transmission shaft a is in a torsional bending state, so as to prevent the transmission shaft a from breaking; The overload disconnection protection mechanism includes a cylinder shell 4, which is fixedly connected to one side of the workbench 1, and a switch coupling 5 is rotatably sleeved inside the cylinder shell 4. A displacement sensor 9 is installed on the top of the cylinder shell 4 to penetrate into the inside, and the displacement sensor 9 is used to detect the rotation angle of the switch coupling 5. A support cylinder sleeve 7 is provided on one side of the cylinder shell 4, and a telescopic coupling 6 is rotatably sleeved in the inner cavity of the support cylinder sleeve 7. The telescopic end of the telescopic coupling 6 penetrates into the cylinder shell 4 and is connected to the output end of the workbench 1 through the switch coupling 5. The fixed end of the telescopic coupling 6 is connected to the transmission shaft a, and a telescopic mechanism 8 is fixedly installed on the side wall of the workbench 1, and the telescopic mechanism 8 is used to control the telescopic coupling 6. The switch coupling 5 is composed of a fixed end component 51 and a movable end component 52. The fixed end component 51 and the movable end component 52 are angle-adaptive to ensure that the coupling can be completed at any rotation angle. The moving end assembly 52 cooperates with the cylinder shell 4 to form a rotation damping after the fixed end assembly 51 and the moving end assembly 52 are disconnected to prevent the transmission shaft a from vibrating due to the instantaneous torque release when testing the fatigue strength of the transmission shaft a.

[0020] The torque is output alternately in the positive and negative directions by twisting the base 2, and the torque acts on the transmission shaft a through the connection of the switch coupling 5 and the telescopic coupling 6. The other end of the transmission shaft a is connected to the detection base 3 to limit the rotation. When the quality of the transmission shaft a is unqualified, it will be torsionally bent under the action of the torque. As the transmission shaft a is twisted, the switch coupling 5 and the telescopic coupling 6 will produce a certain amount of rotation angle. Based on this, the real-time state of the transmission shaft a can be determined by monitoring the rotational displacement of the switch coupling 5 through the displacement sensor 9. When the transmission shaft a undergoes a slight torsion and bending, the telescopic coupling 6 can be driven to contract through the output of the telescopic mechanism 8, and the switch coupling is driven when the telescopic coupling 6 is retracted. 5 turns off the torque transmission, that is, the fixed end component 51 and the movable end component 52 are disconnected. At this time, the workbench 1 can no longer output the torque to the transmission shaft a, thereby preventing the subsequent transmission shaft a from breaking. Due to the disconnection effect of the fixed end component 51 and the movable end component 52, the torque on the transmission shaft a can be quickly released to further avoid breaking, thereby achieving a safety protection effect. After the switch coupling 5 is disconnected, the internal torque of the transmission shaft a caused during the detection process will be released instantly. This release process may cause vibration to affect the overload disconnection protection mechanism as a whole. The rotation damping formed by the cooperation of the movable end component 52 and the cylinder shell 4 can avoid vibration caused by instantaneous release of torque.

[0021] Reference Figure 4The fixed end assembly 51 is composed of a main end tube 56 and a plurality of positioning strips 57. A column hole is opened at one end of the main end tube 56, and a plurality of positioning strips 57 are fixedly connected to the inner wall of the column hole of the main end tube 56; the movable end assembly 52 is composed of an end plate assembly 53, a middle column 54, and a plurality of expanded diameter edge blocks 55. The middle column 54 is fixedly connected to one side of the end plate assembly 53, and a plurality of expanded diameter edge blocks 55 are fixedly connected to the side wall of the middle column 54. A plurality of expanded diameter edge blocks 55 are set as slopes b toward one end of the fixed end assembly 51, and the end plate assembly 53 cooperates with the cylinder shell 4 to form rotational damping.

[0022] When the fixed end component 51 and the movable end component 52 are at the correct connection angle, during the connection process of the fixed end component 51 and the movable end component 52, the middle column 54 and the plurality of expanded diameter side blocks 55 are inserted into the column hole of the main end tube 56, and the plurality of positioning strips 57 are embedded in the gaps between the plurality of expanded diameter side blocks 55 to complete the connection, so that the fixed end component 51 can drive the movable end component 52 to rotate forward or reversely. When the movable end component 52 is angularly misaligned, when the middle column 54 and the expanded diameter side block 55 enter the column hole of the main end tube 56, the positioning strip 57 presses against the slope b of the expanded diameter side block 55, and slides under the influence of the slope. At this time, the fixed end component 51 or the movable end component 52 spins to adapt the angle to complete the connection.

[0023] Reference Figure 5 One end of the positioning strip 57 is fixedly connected with a conical end 571, and one end of the conical end 571 is provided with a hemispherical recess, and a ball 572 is rotatably sleeved in the hemispherical recess.

[0024] In order to avoid the large friction between the positioning strip 57 and the slope b of the expansion edge block 55 that affects the spinning effect of the fixed end assembly 51 and the movable end assembly 52, the friction is reduced by providing a ball 572. In addition, by providing a tapered end 571, the end face of the positioning strip 57 can be made protruding to avoid friction between the edge of the positioning strip 57 and the slope b.

[0025] Reference Figure 4 , 6 7. The end plate assembly 53 includes a main body end plate 531. The side wall of the main body end plate 531 is provided with an annular groove, and a retaining ring frame 532 is rotatably sleeved in the annular groove. The circumferential side of the retaining ring frame 532 is provided with a plurality of through openings penetrating into the inner cavity, and damping blocks 533 are slidably sleeved in the plurality of through openings. The inner wall of the cylinder shell 4 is provided with a plurality of slope grooves 41, and the outer ends of the plurality of damping blocks 533 are slidably sleeved in the plurality of slope grooves 41, respectively.

[0026] When the fixed end component 51 and the movable end component 52 are connected, the damping block 533 is at one end of the slope surface in the slope groove 41. At this time, the damping block 533 does not apply pressure to the main end plate 531, and has no rotational damping effect, thereby avoiding affecting the transmission of the torque of the switch-coupling device 5. When the movable end component 52 is displaced to disconnect the torque output of the switch-coupling device 5, the damping block 533 slides in the slope groove 41 with the overall displacement of the movable end component 52. At this time, the damping block 533 slides along the slope surface of the slope groove 41 and is squeezed to slide in the through-hole of the retaining ring frame 532, thereby making the damping block 533 press against the main end plate 531 to generate resistance to the rotation of the main end plate 531, so that the movable end component 52 produces a rotational damping effect during the process of displacement disconnection and connection with the fixed end component 51.

[0027] Reference Figure 7 An ear chamber is formed on the inner wall of the retaining ring frame 532 , and an ear block 534 is fixedly connected to the side wall of the damping block 533 . The ear block 534 is slidably sleeved in the ear chamber, and the ear block 534 is transmission-connected to the inner wall of the ear chamber through a spring 535 .

[0028] When the fixed end assembly 51 and the movable end assembly 52 are in a connected state, the damping block 533 at the top slides down under the effect of gravity and contacts the main end plate 531, thereby causing resistance to the rotation of the main end plate 531. At this time, the rotation of the movable end assembly 52 is affected. To avoid this situation, the ear block 534 and the spring 535 are provided to position the damping block 533 when the fixed end assembly 51 and the movable end assembly 52 are in a connected state, so as to prevent the damping block 533 from contacting the main end plate 531.

[0029] Reference Figure 7 The inner end surfaces of the plurality of damping blocks 533 are set to be frosted surfaces, and the inner end surfaces are set with curvatures that match the curvatures of the inner walls of the annular grooves of the main end plate 531 .

[0030] The friction between the damping block 533 and the main end plate 531 is increased by setting the inner end surfaces of several damping blocks 533 as frosted surfaces. In addition, the contact area between a single damping block 533 and the main end plate 531 is increased by setting the curvature of the inner end surfaces of several damping blocks 533, thereby further increasing the friction during contact, thereby enhancing the rotational damping effect of the moving end component 52.

[0031] Reference Figure 8 The telescopic coupling 6 includes an outer cylinder 61 and an inner shaft 62. A dustproof chamber is arranged inside the outer cylinder 61, and a spline column groove is opened in the dustproof chamber. One end of the inner shaft 62 passes through the dustproof chamber and is connected to a spline column 63. The spline column 63 is inserted into the spline column groove, and the output end of the telescopic mechanism 8 is connected to the inner shaft 62.

[0032] Through the structural characteristics of the spline column 63 and the spline column groove, the rotational torque of the inner shaft 62 can be transmitted to the outer tube 61 without affecting the displacement of the inner shaft 62, so that the telescopic coupling 6 can have telescopic characteristics while being able to transmit torque. In addition, through the structural setting of the telescopic coupling 6, the spline column 63 can be protected in a dustproof room to prevent external impurities from interfering with the operation of the telescopic coupling 6.

[0033] Reference Fig. 9 The telescopic mechanism 8 includes an electric cylinder 81, the output end of the electric cylinder 81 is fixedly connected to a connecting disk 82, the side wall of the inner shaft 62 is provided with an annular positioning groove 1, the connecting disk 82 is rotatably sleeved in the annular positioning groove, and the displacement of the connecting disk 82 is controlled by the output of the electric cylinder 81.

[0034] Through the connection characteristics between the connecting disk 82 and the inner shaft 62 , the telescopic mechanism 8 can control the telescopic coupling 6 to achieve a telescopic effect without affecting the rotation of the inner shaft 62 .

[0035] Reference Fig. 9 The number of electric cylinders 81 is more than one, and they are evenly distributed around the central axis of the inner shaft 62.

[0036] This arrangement ensures that the output of the telescopic mechanism 8 only generates axial push and pull forces on the inner shaft 62, thereby ensuring force balance.

[0037] Reference Fig.10 The inner wall of the cylinder shell 4 is provided with an annular convex frame 42, and the side wall of the fixed end component 51 is provided with an annular positioning groove 2, and the annular convex frame 42 is embedded in the annular positioning groove 2.

[0038] This arrangement can be used to position the fixed end assembly 51 axially, thereby preventing the fixed end assembly 51 from being deflected and causing structural damage due to high friction when the fixed end assembly 51 is displaced and disconnected.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. The present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-speed transmission shaft torsional fatigue strength testing device, comprising a workbench (1), wherein a torsion machine base (2) and a testing machine base (3) are arranged on the top of the workbench (1), wherein the torsion machine base (2) is used to output torque, and the testing machine base (3) is used to detect torque, and wherein: It also includes an overload disconnection protection mechanism, wherein the output end of the torsion machine base (2) is connected to the transmission shaft a through the overload disconnection protection mechanism, and the overload disconnection protection mechanism is used to determine the state of the transmission shaft a and disconnect the torque output when the transmission shaft a is in a torsion bending state, so as to prevent the transmission shaft a from breaking; The overload disconnection protection mechanism comprises a cylinder shell (4), the cylinder shell (4) is fixedly connected to one side of the workbench (1), a switch coupling (5) is rotatably sleeved inside the cylinder shell, a displacement sensor (9) is installed on the top of the cylinder shell (4) and is used to detect the rotation angle of the switch coupling (5), a support cylinder sleeve (7) is provided on one side of the cylinder shell (4), a telescopic coupling (6) is rotatably sleeved in the inner cavity of the support cylinder sleeve (7), the telescopic end of the telescopic coupling (6) penetrates into the cylinder shell (4) and is connected to the output end of the workbench (1) through the switch coupling (5), the fixed end of the telescopic coupling (6) is connected to the transmission shaft a, and a telescopic mechanism (8) is fixedly installed on the side wall of the workbench (1), and the telescopic mechanism (8) is used to control the telescopic coupling (6) to extend and retract; The switch coupling (5) is composed of a fixed end component (51) and a movable end component (52), and the fixed end component (51) and the movable end component (52) are angle-adaptive, ensuring that the connection can be completed at any rotation angle; The movable end assembly (52) cooperates with the cylindrical shell (4) to form a rotation damping after the fixed end assembly (51) and the movable end assembly (52) are disconnected, thereby preventing the transmission shaft a from causing vibration due to instantaneous torque release.

2. The high-speed transmission shaft torsional fatigue strength testing device according to claim 1, characterized in that: The fixed end assembly (51) is composed of a main end tube (56) and a plurality of positioning inserts (57); a column hole is opened at one end of the main end tube (56); and the plurality of positioning inserts (57) are fixedly connected to the inner wall of the column hole of the main end tube (56); The movable end assembly (52) is composed of an end plate assembly (53), a middle column (54), and a plurality of expanded diameter side blocks (55); the middle column (54) is fixedly connected to one side of the end plate assembly (53); the plurality of expanded diameter side blocks (55) are fixedly connected to the side wall of the middle column (54); one end of the plurality of expanded diameter side blocks (55) facing the fixed end assembly (51) is provided with a slope surface b; the end plate assembly (53) cooperates with the cylinder shell (4) to form a rotation damper.

3. The high-speed transmission shaft torsional fatigue strength testing device according to claim 2, characterized in that: One end of the positioning strip (57) is fixedly connected to a conical end head (571), and one end of the conical end head (571) is provided with a hemispherical recess, in which a ball (572) is rotatably sleeved.

4. The high-speed transmission shaft torsional fatigue strength testing device according to claim 2, characterized in that: The end plate assembly (53) comprises a main end plate (531), a side wall of the main end plate (531) is provided with an annular groove, a retaining ring frame (532) is rotatably sleeved in the annular groove, a circumferential side of the retaining ring frame (532) is provided with a plurality of through openings penetrating into the inner cavity, a damping block (533) is slidably sleeved in each of the plurality of through openings, an inner wall of the cylinder shell (4) is provided with a plurality of slope grooves (41), and the outer ends of the plurality of damping blocks (533) are slidably sleeved in the plurality of slope grooves (41), respectively.

5. The high-speed transmission shaft torsional fatigue strength testing device according to claim 4, characterized in that: An ear chamber is formed on the inner wall of the retaining ring frame (532), an ear block (534) is fixedly connected to the side wall of the damping block (533), the ear block (534) is slidably sleeved in the ear chamber, and the ear block (534) is transmission-connected to the inner wall of the ear chamber via a spring (535).

6. The high-speed transmission shaft torsional fatigue strength testing device according to claim 4, characterized in that: The inner end surfaces of the plurality of damping blocks (533) are configured as frosted surfaces, and the inner end surfaces are configured with an arc that matches the arc of the inner wall of the annular groove of the main body end plate (531).

7. The high-speed transmission shaft torsional fatigue strength testing device according to claim 1, characterized in that: The telescopic coupling (6) comprises an outer cylinder (61) and an inner shaft (62); a dustproof chamber is arranged inside the outer cylinder (61); a spline column groove is provided in the dustproof chamber; one end of the inner shaft (62) penetrates into the dustproof chamber and is connected to a spline plug column (63); the spline plug column (63) is inserted into the spline column groove; and the output end of the telescopic mechanism (8) is connected to the inner shaft (62).

8. The high-speed transmission shaft torsional fatigue strength testing device according to claim 7, characterized in that: The telescopic mechanism (8) comprises an electric cylinder (81), the output end of the electric cylinder (81) being fixedly connected to a connecting disk (82), a side wall of the inner shaft (62) being provided with an annular positioning groove, the connecting disk (82) being rotatably sleeved in the annular positioning groove, and the displacement of the connecting disk (82) being controlled by the output of the electric cylinder (81).

9. The high-speed transmission shaft torsional fatigue strength testing device according to claim 8, characterized in that: The number of the electric cylinders (81) is more than one, and they are evenly distributed around the central axis of the inner shaft (62).

10. The high-speed transmission shaft torsional fatigue strength testing device according to claim 1, characterized in that: The inner wall of the cylinder shell (4) is provided with an annular convex frame (42), the side wall of the fixed end assembly (51) is provided with an annular positioning groove II, and the annular convex frame (42) is embedded in the annular positioning groove II.

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