A high-speed transmission shaft torsional fatigue strength testing equipment

Abstract

The present invention relates to the technical field of torsion testing, and discloses a high-speed transmission shaft torsional fatigue strength testing equipment, 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 to detect torque, and the workbench comprises 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 present invention arranges an overload disconnection protection mechanism on the basis of traditional testing equipment, performs state detection on the transmission shaft a in the torsional fatigue strength test, predicts whether the transmission shaft a of the test piece has the risk of breaking, and at the same time, when it is determined 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, so as to prevent the transmission shaft a from being continuously stressed and broken in the abnormal state.

Description

Technical Field

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

[0002] A high-speed driveshaft is a shaft specifically designed to transmit power. In an automotive transmission system, it connects the output of the transmission to the drive axle (or rear axle), serving as a crucial bridge for transmitting engine power to the wheels. During production, to ensure that the driveshaft can meet the requirements of long-term, high-speed, and high-load operation, it undergoes rigorous performance testing. Torsional fatigue testing is a key test. Its purpose is to assess the material's durability or fatigue life under torsional loads. Testing equipment applies a cyclical, alternating positive and negative torsional load to a driveshaft specimen, observing and recording whether fatigue failure occurs after a certain number of torsional cycles. Specifically, during the test, the driveshaft's deformation, stress distribution, and potential crack initiation are continuously monitored to assess its torsional fatigue strength. The testing equipment typically consists of a workbench, a torsion base, and a test base. The torsion base connects to one end of the driveshaft and applies the torsional force, while the test base connects to the other end. The test base houses a torque sensor for detecting torque.

[0003] Traditional torsional fatigue strength testing typically involves applying a 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 testing equipment or injury to the tester, posing a safety hazard to the operation of torsional fatigue strength testing equipment. Summary of the Invention

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

[0005] The present invention provides the following technical solution: a high-speed transmission shaft torsional fatigue strength testing device, comprising a workbench, a torsion machine base and a detection machine base disposed on the top of the workbench, the torsion machine base being used to output torque, the detection machine base being used to detect torque, and comprising an overload disconnection protection mechanism, wherein 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 being 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, thereby preventing the transmission shaft A from breaking;

[0006] The overload disconnection protection mechanism includes a cylindrical shell, which is fixedly connected to one side of the workbench, and a switch coupling is rotatably sleeved inside the cylindrical shell. A displacement sensor is installed on the top of the cylindrical shell to penetrate into the interior, and the displacement sensor is used to detect the rotation angle of the switch coupling. A support sleeve is provided on one side of the cylindrical shell, and a telescopic coupling is rotatably sleeved in the inner cavity of the support sleeve. The telescopic end of the telescopic coupling penetrates into the interior of the cylindrical 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.

[0007] 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 they can be connected at any rotation angle;

[0008] 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.

[0009] Furthermore, the fixed end assembly is composed of a main end tube and several positioning strips, a column hole is opened at one end of the main end tube, and several 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 several expanded diameter edge blocks, the middle column is fixedly connected on one side of the end disc assembly, and several expanded diameter edge blocks are fixedly connected on the side wall of the middle column, and several expanded diameter edge blocks are set 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.

[0010] Furthermore, one end of the positioning strip is fixedly connected to a tapered end head, one end of the tapered end head is provided with a hemispherical recess, and a ball is rotatably sleeved in the hemispherical recess.

[0011] Furthermore, the end plate assembly includes a main end plate, a side wall of the main end plate is provided with an annular groove, a retaining ring frame is rotatably sleeved in the annular groove, a circumferential side of the retaining ring frame is provided with a number of through-holes penetrating into the inner cavity, a damping block is slidably sleeved in each of the through-holes, a number of sloped grooves are provided on the inner wall of the cylinder shell, and the outer ends of the damping blocks are respectively slidably sleeved in the number of sloped grooves.

[0012] Furthermore, an ear chamber is opened on the inner wall of the retaining ring frame, and 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 through a spring.

[0013] Furthermore, the inner end surfaces of several 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.

[0014] Furthermore, the telescopic coupling includes an outer tube and an inner shaft. A dustproof chamber is provided inside the outer tube, a spline column groove is provided 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.

[0015] 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.

[0016] Furthermore, the number of the electric cylinders is more than one, and they are evenly distributed around the central axis of the inner shaft.

[0017] 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 assembly, and the annular convex frame is embedded in the annular positioning groove 2.

[0018] The technical effects and advantages of the present invention are as follows:

[0019] The present invention provides an overload disconnection protection mechanism on the basis of traditional detection equipment, and performs status detection on the transmission shaft a in the torsional fatigue strength detection through the cooperation of the switching 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 movable end component of the switching coupling are disconnected by the force of the telescopic mechanism and the telescopic coupling, thereby preventing the transmission shaft a from being continuously stressed and breaking under the abnormal state, thereby improving the safety performance of the equipment.

[0020] The fixed end assembly and the moving end assembly of the switch coupling have also been structurally improved. Since the fixed end assembly and the moving end assembly have 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 are combined with the structural main body end tube and the positioning strip of the fixed end assembly to achieve the angle adaptation of the fixed end assembly and the moving end assembly during connection, ensuring accurate connection and reducing human intervention.

[0021] 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 slope groove of the cylinder shell, the moving end assembly can form a rotational damping effect during the disconnection process with the fixed end assembly. This 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

[0022] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the explosion of the overload disconnection protection mechanism structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 Schematic diagram of the switch coupling structure;

[0025] Figure 4 For the present invention Figure 3 Schematic diagram of the structure of the fixed end component and the moving end component;

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the positioning fillet structure;

[0027] Figure 6 Schematic diagram of the cross-section of the structure of the drum shell and the end plate assembly of the present invention;

[0028] Figure 7 For the present invention Figure 4 A schematic side cross-sectional view of the end plate assembly structure;

[0029] Figure 8 For the present invention Figure 2 Schematic diagram of the telescopic coupling structure;

[0030] Figure 9 For the present invention Figure 2 Schematic diagram of the telescopic mechanism structure;

[0031] Figure 10 For the present invention Figure 2 Schematic diagram of the middle shell structure.

[0032] 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 disc assembly; 54. center column; 55. expansion edge block; 56. main end cylinder; 57. positioning insert; 571. tapered end; 572. ball; 531. main end disc; 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. splined column; 81. electric cylinder; 82. connecting disc. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] Reference Figure 1-Figure 3The present invention provides a high-speed transmission shaft torsional fatigue strength testing device, comprising a workbench 1, with a torsion machine base 2 and a detection machine base 3 provided 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 to detect torque. The device is characterized in that: an overload disconnection protection mechanism is included, and 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, thereby preventing the transmission shaft a from breaking;

[0035] The overload disconnection protection mechanism includes a cylindrical shell 4, which is fixedly connected to one side of the workbench 1, and a switch coupling 5 is rotatably sleeved inside the cylindrical shell 4. A displacement sensor 9 is installed on the top of the cylindrical shell 4 to penetrate into the interior. The displacement sensor 9 is used to detect the rotation angle of the switch coupling 5. A support sleeve 7 is provided on one side of the cylindrical shell 4. A telescopic coupling 6 is rotatably sleeved in the inner cavity of the support sleeve 7. The telescopic end of the telescopic coupling 6 penetrates into the interior of the cylindrical shell 4 and docks with 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. A telescopic mechanism 8 is fixedly installed on the side wall of the workbench 1. The telescopic mechanism 8 is used to control the telescopic coupling 6.

[0036] 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 they can be connected at any rotation angle.

[0037] The moving end assembly 52 cooperates with the cylindrical 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, during the fatigue strength test of the transmission shaft a.

[0038] The torque is output alternately in the forward and reverse 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 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 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 exerted on the transmission shaft a can be quickly released to further avoid breaking, thereby achieving a safety protection effect. After the switching coupling 5 is disconnected, the internal torque of the transmission shaft a caused by 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 cylindrical shell 4 can avoid vibration caused by the instantaneous release of torque.

[0039] Reference Figure 4 The fixed end assembly 51 is composed of a main end tube 56 and a number of positioning strips 57. A column hole is opened at one end of the main end tube 56, and a number 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 disc assembly 53, a middle column 54, and a number of expanded diameter edge blocks 55. The middle column 54 is fixedly connected on one side of the end disc assembly 53, and a number of expanded diameter edge blocks 55 are fixedly connected on the side wall of the middle column 54. A number of expanded diameter edge blocks 55 are set as slopes b toward one end of the fixed end assembly 51, and the end disc assembly 53 cooperates with the cylinder shell 4 to form rotational damping.

[0040] When the fixed end assembly 51 and the movable end assembly 52 are at the correct connection angle, the middle column 54 and several expanded diameter side blocks 55 are inserted into the column hole of the main end tube 56 during the connection process of the fixed end assembly 51 and the movable end assembly 52, and several positioning strips 57 are embedded in the gaps between several expanded diameter side blocks 55 to complete the connection, so that the fixed end assembly 51 can drive the movable end assembly 52 to rotate forward or backward. When the movable end assembly 52 has an angular misalignment, the middle column 54 and the expanded diameter side block 55 enter the column hole of the main end tube 56, and 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 assembly 51 or the movable end assembly 52 spins to adapt the angle to complete the connection.

[0041] Reference Figure 5 One end of the positioning strip 57 is fixedly connected to a tapered end 571, and one end of the tapered end 571 is provided with a hemispherical recess, in which a ball 572 is rotatably sleeved.

[0042] In order to avoid the large friction between the positioning strip 57 and the slope b of the expansion edge block 55, which affects the spinning effect of the fixed end assembly 51 and the movable end assembly 52, the friction is reduced by setting a ball 572. In addition, by setting a tapered end 571, the end face of the positioning strip 57 can be made protruding to avoid friction caused by the contact between the edge of the positioning strip 57 and the slope b.

[0043] Reference Figure 4 、 6 7. The end disc assembly 53 includes a main end disc 531. The side wall of the main end disc 531 is provided with an annular groove, and a retaining ring frame 532 is rotatably sleeved in the annular groove. The circumference of the retaining ring frame 532 is provided with a plurality of through-holes penetrating into the inner cavity, and damping blocks 533 are slidably sleeved in the plurality of through-holes. 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.

[0044] 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 of the movable end component 52 is displaced as a whole and slides in the slope groove 41. 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.

[0045] Reference Figure 7 The inner wall of the retaining ring frame 532 is provided with an ear chamber, and the side wall of the damping block 533 is fixedly connected with an ear block 534. 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.

[0046] When the fixed end assembly 51 and the movable end assembly 52 are in the 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 the main end plate 531 to rotate and generate resistance. 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 the connected state, thereby preventing the damping block 533 from contacting the main end plate 531.

[0047] Reference Figure 7 The inner end surfaces of the damping blocks 533 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 end plate 531.

[0048] 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 to 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.

[0049] Reference Figure 8 The telescopic coupling 6 includes an outer cylinder 61 and an inner shaft 62. A dustproof chamber is set 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.

[0050] 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, thereby making the telescopic coupling 6 have telescopic characteristics while also 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.

[0051] Reference Figure 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, and an annular positioning groove is opened on the side wall of the inner shaft 62. The connecting disk 82 is rotated and sleeved in the annular positioning groove, and the displacement of the connecting disk 82 is controlled by the output of the electric cylinder 81.

[0052] The connection characteristics between the connecting disk 82 and the inner shaft 62 can achieve the telescopic effect of the telescopic coupling 6 controlled by the telescopic mechanism 8 without affecting the rotation of the inner shaft 62 .

[0053] Reference Figure 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.

[0054] 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.

[0055] Reference Figure 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.

[0056] This arrangement can be used to axially position the fixed end assembly 51, 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.

[0057] The basic principles, main features, and advantages of the present invention are shown and described above. The present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended 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 detection machine base (3) are provided on the top of the workbench (1), wherein the torsion machine base (2) is used to output torsion, and the detection machine base (3) is used to detect torque, and is characterized in that: 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, thereby preventing the transmission shaft a from breaking; The overload disconnection protection mechanism includes a cylindrical shell (4), the cylindrical shell (4) is fixedly connected to one side of the workbench (1), and a switch coupling (5) is rotatably sleeved inside the cylindrical shell. A displacement sensor (9) is installed on the top of the cylindrical shell (4) and is used to detect the rotation angle of the switch coupling (5). A support cylindrical sleeve (7) is provided on one side of the cylindrical shell (4), and a telescopic coupling (6) is rotatably sleeved in the inner cavity of the support cylindrical sleeve (7). The telescopic end of the telescopic coupling (6) penetrates into the cylindrical 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. 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), and the fixed end component (51) and the movable end component (52) are angle-adaptive, ensuring that any rotation angle thereof can complete the connection; 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 to prevent vibration caused by instantaneous torque release of the transmission shaft a; The 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 the 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 disc assembly (53), a center column (54), and a plurality of expanded diameter side blocks (55). The center column (54) is fixedly connected to one side of the end disc assembly (53). The plurality of expanded diameter side blocks (55) are fixedly connected to the side wall of the center 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 disc assembly (53) cooperates with the cylindrical shell (4) to form a rotation damper.

2. The high-speed transmission shaft torsional fatigue strength testing device according to claim 1, characterized in that: One end of the positioning strip (57) is fixedly connected to a tapered end head (571), and one end of the tapered end head (571) is provided with a hemispherical recess, in which a ball (572) is rotatably sleeved.

3. The high-speed transmission shaft torsional fatigue strength testing device according to claim 1, characterized in that: The end plate assembly (53) includes 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-holes penetrating into the inner cavity, a damping block (533) is slidably sleeved in each of the plurality of through-holes, a plurality of sloped grooves (41) are provided on the inner wall of the cylindrical shell (4), and the outer ends of the plurality of damping blocks (533) are slidably sleeved in the plurality of sloped grooves (41).

4. The high-speed transmission shaft torsional fatigue strength testing device according to claim 3, characterized in that: 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 via a spring (535).

5. The high-speed transmission shaft torsional fatigue strength testing device according to claim 3, 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 provided with an arc that matches the arc of the inner wall of the annular groove of the main end plate (531).

6. 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 provided 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).

7. The high-speed transmission shaft torsional fatigue strength testing device according to claim 6, characterized in that: 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, 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).

8. The high-speed transmission shaft torsional fatigue strength testing device according to claim 7, 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).

9. The high-speed transmission shaft torsional fatigue strength testing device according to claim 1, characterized in that: The inner wall of the cylindrical 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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