Torsional fatigue strength testing device and method

Abstract

The invention provides a torsional fatigue strength test device and method, and belongs to the technical field of transmission detection, the torsional fatigue strength test device comprises a mounting seat, an axial moving seat, a radial moving seat and a circumferential moving seat, the axial moving seat and the radial moving seat are respectively mounted on the mounting seat, the circumferential moving seat is mounted on the radial moving seat, and the axial moving seat and the radial moving seat are respectively mounted on the mounting seat. The axial moving seat is provided with a speed reducing motor, the axial moving mechanism is installed on the installation seat, the output end of the axial moving mechanism is connected with the axial moving seat, and the axial moving mechanism is used for driving the axial moving seat to move in the axial direction; and the radial moving mechanism is mounted on the mounting base, the output end of the radial moving mechanism is connected with the radial moving base, and the radial moving mechanism is used for driving the radial moving base to move in the radial direction. The axial and radial angles of the transmission shaft to be tested are respectively adjusted through the axial moving mechanism and the radial moving mechanism, the structure is simple, the adjustment is convenient, the labor intensity of workers is reduced, the working efficiency is improved, and the productivity is further improved.

Description

Technical Field

[0001] This invention relates to the field of transmission testing technology, and in particular to a torsional fatigue strength testing device and method. Background Technology

[0002] Torque fatigue testing devices are mainly used to inspect automotive drive shafts. Current technology primarily uses screws for fixing the axial and radial moving seats onto a mounting base. When adjustment is needed, the screws must be loosened first, then adjusted, and finally locked back in place. This results in low testing efficiency and high labor intensity for workers. In today's rapidly developing automotive industry, rapid and efficient testing has become a key factor restricting capacity expansion.

[0003] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a torsional fatigue strength testing device and method, which has a simple structure and can collect the cut scraps.

[0005] To achieve the above objectives, a first aspect of the present invention provides a torsional fatigue strength testing device, comprising a mounting base, an axially movable base, a radially movable base, and a circumferentially movable base, wherein the axially movable base and the radially movable base are respectively mounted on the mounting base, the circumferentially movable base is mounted on the radially movable base, and the axially movable base is equipped with a reduction motor, and further comprising:

[0006] An axial moving mechanism is installed on the mounting base, and its output end is connected to the axial moving base, for driving the axial moving base to move along the axial direction;

[0007] A radial moving mechanism is installed on the mounting base, and its output end is connected to the radial moving base, for driving the radial moving base to move in the radial direction.

[0008] In a further technical solution, the mounting base has an axial groove, the axial moving mechanism includes an axial drive component and an axial transmission assembly, the axial drive component is mounted on the mounting base, the axial transmission assembly is mounted on the axial groove, the output end of the axial drive component is connected to the axial transmission assembly, and the axial moving base is mounted on the output end of the axial transmission assembly.

[0009] In a further technical solution, the axial transmission assembly includes a first support, a second support, a first lead screw, and a first nut seat. The first support is installed at the first end of the axial groove, the second support is installed at the second end of the axial groove, the two ends of the first lead screw are respectively installed on the first support and the second support, the inner side of the first nut seat is sleeved on the first lead screw, and the outer side of the first nut seat is installed on the axial moving seat.

[0010] In a further technical solution, the mounting base has a first guide groove, and the bottom of the axially movable base is equipped with a first guide member corresponding to the first guide groove, and the first guide member is slidably mounted in the first guide groove.

[0011] In a further technical solution, the first guide member includes a first guide portion and a first connecting portion, the first guide portion is connected to the first connecting portion, the first guide groove includes a first guide cavity and a first connecting cavity, the first guide cavity communicates with the first connecting cavity, the first guide portion is installed in the first guide cavity, and the first connecting portion passes through the first connecting cavity and is connected to the axial moving seat.

[0012] In a further technical solution, the mounting base has a radial groove, the radial moving mechanism includes a radial drive component and a radial transmission assembly, the radial drive component is mounted on the mounting base, the radial transmission assembly is mounted on the radial groove, the output end of the radial drive component is connected to the radial transmission assembly, and the radial moving base is mounted on the output end of the radial transmission assembly.

[0013] In a further technical solution, the radial transmission assembly includes a third support, a fourth support, a second lead screw, and a second nut seat. The third support is installed at the first end of the radial groove, the fourth support is installed at the second end of the radial groove, the two ends of the second lead screw are respectively installed on the third support and the fourth support, the inner side of the second nut seat is sleeved on the second lead screw, and the outer side of the second nut seat is installed on the radial moving seat.

[0014] In a further technical solution, the mounting base has a second guide groove, and the bottom of the radially movable base is equipped with a second guide member corresponding to the second guide groove, the second guide member being slidably mounted on the first guide groove.

[0015] In a further technical solution, the second guide member includes a second guide portion and a second connecting portion, the second guide portion is connected to the second connecting portion, the second guide groove includes a second guide cavity and a second connecting cavity, the second guide cavity is connected to the second connecting cavity, the second guide portion is installed in the second guide cavity, and the second connecting portion passes through the second connecting cavity and is connected to the radial moving seat.

[0016] A second aspect of the present invention provides a method for testing the torque fatigue resistance of a transmission shaft, using the aforementioned torsional fatigue strength testing apparatus, comprising:

[0017] S1. The circumferential moving seat and the axial moving seat are fixed to the transmission shaft to be tested;

[0018] S2, the axial moving mechanism, the radial moving mechanism and the circumferential moving seat respectively adjust the placement angle of the drive shaft;

[0019] S3. The motor and reducer on the axial moving seat output power to drive the transmission shaft to rotate for torque fatigue testing and obtain the test results.

[0020] Compared with existing technologies, the present invention brings the following technical effects:

[0021] The present invention discloses a torsional fatigue strength testing device, which adjusts the axial and radial angles of the transmission shaft to be tested through an axial movement mechanism and a radial movement mechanism, respectively. The device has a simple structure, is easy to adjust, reduces the labor intensity of workers, improves work efficiency, and thus increases production capacity.

[0022] The present invention provides a method for testing the torque fatigue resistance of a transmission shaft. By applying a torsional fatigue strength testing device, the method reduces the labor intensity of workers, improves work efficiency, and thus increases production capacity. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a torsional fatigue strength testing device according to the present invention.

[0025] Figure 2 This is another structural schematic diagram of a torsional fatigue strength testing device according to the present invention.

[0026] Figure 3 This is a side view of a torsional fatigue strength testing device according to the present invention.

[0027] Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0028] Figure 5This is a schematic diagram of another side of the torsional fatigue strength testing device of the present invention.

[0029] Figure 6 yes Figure 5 Enlarged diagram of point B in the middle.

[0030] Explanation of key component symbols:

[0031] 1. Mounting base; 11. Axial groove; 12. First guide groove; 121. First guide cavity; 122. First connecting cavity; 13. Radial groove; 14. Second guide groove; 141. Second guide cavity; 142. Second connecting cavity;

[0032] 2. Axial moving seat; 21. First guide member; 211. First guide part; 212. First connecting part;

[0033] 3. Radial moving seat; 31. Second guide member; 311. Second guide part; 312. Second connecting part;

[0034] 4. Circular movable seat;

[0035] 5. Axial movement mechanism; 51. Axial drive component; 52. Axial transmission assembly; 521. First support; 522. Second support; 523. First lead screw; 524. First nut seat;

[0036] 6. Radial moving mechanism; 61. Radial drive component; 62. Radial transmission assembly; 621. Third support; 622. Fourth support; 623. Second lead screw; 624. Second nut seat. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] The following will combine Figure 1-6 The specific embodiments of the present invention will be described in further detail below.

[0043] Example 1

[0044] like Figure 1-6 As shown, this embodiment provides a torsional fatigue strength testing device, including a mounting base 1, an axially movable base 2, a radially movable base 3, and a circumferentially movable base 4. The axially movable base 2 and the radially movable base 3 are respectively mounted on the mounting base 1, and the circumferentially movable base 4 is mounted on the radially movable base 3. The axially movable base 2 is equipped with a reduction motor, and the device further includes:

[0045] An axial movement mechanism 5 is installed on the mounting base 1, and its output end is connected to the axial movement seat 2, which is used to drive the axial movement seat 2 to move along the axial direction;

[0046] The radial moving mechanism 6 is installed on the mounting base 1, and its output end is connected to the radial moving base 3, which is used to drive the radial moving base 3 to move in the radial direction.

[0047] The axial and radial angles of the transmission shaft under test are adjusted by the axial moving mechanism 5 and the radial moving mechanism 6, respectively. With the cooperation of the circumferential moving seat 4, the angle adjustment of the transmission shaft under test is completed. The structure is simple and the adjustment is convenient, which reduces the labor intensity of the staff, improves the work efficiency, and thus increases the production capacity.

[0048] In a further specific embodiment, the mounting base 1 has an axial groove 11, the axial moving mechanism 5 includes an axial drive component 51 and an axial transmission assembly 52, the axial drive component 51 is mounted on the mounting base 1, the axial transmission assembly 52 is mounted on the axial groove 11, the output end of the axial drive component 51 is connected to the axial transmission assembly 52, and the axial moving seat 2 is mounted on the output end of the axial transmission assembly 52.

[0049] It should be noted that the top of the mounting base 1 is recessed downward to form the axial groove 11, and at least one end of the axial groove 11 passes through the mounting base 1. By setting the axial groove 11, the axial transmission assembly 52 can be installed in the axial groove 11, avoiding exposure on the surface of the mounting base 1 and thus avoiding any impact on the transmission shaft during testing.

[0050] It is worth mentioning that in this embodiment, the axial drive component 51 is a motor, which drives the axial moving seat 2 to move along the axial direction of the transmission shaft through the axial transmission assembly 52. ​​In other specific embodiments, the axial drive component 51 may also be a combination of a motor and transmission gears, or a rotary cylinder.

[0051] During installation, the motor can be directly mounted on the mounting base 1, or a bracket can be set up, with the bracket mounted on the mounting base 1 and the motor mounted on the bracket. The output end of the motor extends into the axial groove 11 and connects with the axial transmission assembly 52.

[0052] In a preferred embodiment, the axial transmission assembly 52 of this embodiment includes a first support 521, a second support 522, a first lead screw 523, and a first nut seat 524. The first support 521 is installed at the first end of the axial groove 11, the second support 522 is installed at the second end of the axial groove 11, the two ends of the first lead screw 523 are respectively installed on the first support 521 and the second support 522, the inner side of the first nut seat 524 is sleeved on the first lead screw 523, and the outer side of the first nut seat 524 is installed on the axial moving seat 2.

[0053] It is understood that the axial drive component 51, i.e., the output shaft of the motor, and the first lead screw 523 are coaxial and connected by a coupling. The first support 521 and the second support 522 are respectively equipped with bearings, and a bearing passes through each end of the first lead screw 523. When the axial drive component 51 drives the first lead screw 523 to rotate, the axial moving seat 2 moves along the axial direction of the first lead screw 523 via the first nut seat 524, thereby adjusting the axial distance.

[0054] In other specific embodiments, the axial transmission assembly 52 can also be a combination of a synchronous pulley set and a synchronous belt, that is, the synchronous pulley set is set in the axial groove 11, the synchronous belt is sleeved on the synchronous pulley set, the output end of the axial drive member 51 is connected to one of the synchronous pulleys of the synchronous pulley set, the bottom of the axial moving seat 2 is connected to the transmission belt, and the axial drive member 51 drives the synchronous belt to rotate around the synchronous pulley set through the synchronous pulley set, thereby driving the axial moving seat 2 to move along the length direction of the synchronous belt.

[0055] In a further technical solution, the mounting base 1 has a first guide groove 12, and the bottom of the axial moving base 2 is equipped with a first guide member 21 corresponding to the first guide groove 12, and the first guide member 21 is slidably mounted on the first guide groove 12.

[0056] The cooperation of the first guide groove 12 and the first guide member 21 guides the movement of the axial moving seat 2, preventing deviation of the axial moving seat 2 during movement and further ensuring the accuracy of the transmission shaft detection. It is understood that there are two of each of the first guide groove 12 and the first guide member 21.

[0057] In a further technical solution, the first guide member 21 includes a first guide portion 211 and a first connecting portion 212. The first guide portion 211 is connected to the first connecting portion 212. The first guide groove 12 includes a first guide cavity 121 and a first connecting cavity 122. The first guide cavity 121 communicates with the first connecting cavity 122. The first guide portion 211 is installed in the first guide cavity 121. The first connecting portion 212 passes through the first connecting cavity 122 and is connected to the axial moving seat 2.

[0058] It should be noted that the width of the first guide cavity 121 is greater than the width of the first connecting cavity 122, and both the first guide cavity 121 and the first connecting cavity 122 are rectangular. The cross-section of the first guide groove 12 is convex. When the axial moving seat 2 moves along the first lead screw 523, the first guide part 211 moves within the first guide cavity 121, and the first connecting part 212 moves within the first connecting cavity 122. The lower end of the first connecting part 212 is located within the first connecting cavity 122, and the upper end of the first connecting part 212 is threaded. The first connecting part 212 is screwed to the axial moving seat 2 via the thread. This configuration further enhances the stability of the axial moving seat 2 when it moves along the first lead screw 523, thereby improving the accuracy of the transmission shaft detection.

[0059] It is understandable that by setting up the axial movement mechanism 5, the control mechanism of the entire testing device can accurately control the movement distance of the axial movement seat 2, ensuring the accuracy of the test data, thereby improving work efficiency and increasing production capacity.

[0060] In a further technical solution, the mounting base 1 has a radial groove 13, the radial moving mechanism 6 includes a radial drive member 61 and a radial transmission assembly 62, the radial drive member 61 is mounted on the mounting base 1, the radial transmission assembly 62 is mounted on the radial groove 13, the output end of the radial drive member 61 is connected to the radial transmission assembly 62, and the radial moving base 3 is mounted on the output end of the radial transmission assembly 62.

[0061] It should be noted that the top of the mounting base 1 is recessed downward to form the radial groove 13, and at least one end of the radial groove 13 passes through the mounting base 1. As a preferred embodiment, the radial groove 13 of this embodiment passes through the mounting base 1. By setting the radial groove 13, the radial transmission component 62 can be installed in the radial groove 13, avoiding exposure on the surface of the mounting base 1 and affecting the transmission shaft during testing.

[0062] It is worth mentioning that in this embodiment, the radial drive component 61 is a motor, which drives the radial moving seat 3 to move along the radial direction of the transmission shaft through the radial transmission assembly 62. In other specific embodiments, the radial drive component 61 can also be a combination of a motor and transmission gears, or a rotary cylinder.

[0063] During installation, the motor can be directly mounted on the mounting base 1, or a bracket can be set up, with the bracket mounted on the mounting base 1 and the motor mounted on the bracket. The output end of the motor extends into the radial groove 13 and connects to the radial transmission assembly 62.

[0064] In a further technical solution, the radial transmission assembly 62 includes a third support 621, a fourth support 622, a second lead screw 623, and a second nut seat 624. The third support 621 is installed at the first end of the radial groove 13, the fourth support 622 is installed at the second end of the radial groove 13, the two ends of the second lead screw 623 are respectively installed on the third support 621 and the fourth support 622, the inner side of the second nut seat 624 is sleeved on the second lead screw 623, and the outer side of the second nut seat 624 is installed on the radial moving seat 3.

[0065] It is understood that the radial drive component 61, i.e., the output shaft of the motor, and the second lead screw 623 are coaxial and connected by a coupling. Bearings are installed on the third support 621 and the fourth support 622, and a bearing passes through each end of the second lead screw 623. When the radial drive component 61 drives the second lead screw 623 to rotate, the radial moving seat 3 moves along the axial direction of the lead screw via the second nut seat 624, thereby adjusting the radial distance. In conjunction with the axial moving mechanism 5, the test angle of the transmission shaft is adjusted.

[0066] In other specific embodiments, the radial transmission component 62 can also be a combination of a synchronous pulley set and a synchronous belt. That is, the synchronous pulley set is set in the radial groove 13, the synchronous belt is sleeved on the synchronous pulley set, the output end of the radial drive member 61 is connected to one of the synchronous pulleys of the synchronous pulley set, the bottom of the radial moving seat 3 is connected to the transmission belt, and the radial drive member 61 drives the synchronous belt to rotate around the synchronous pulley set through the synchronous pulley set, thereby driving the radial moving seat 3 to move along the length direction of the synchronous belt.

[0067] In a further technical solution, the mounting base 1 has a second guide groove 14, and the bottom of the radially movable base 3 is equipped with a second guide member 31 corresponding to the second guide groove 14. The second guide member 31 is slidably mounted on the first guide groove 12.

[0068] The movement of the radially moving seat 3 is guided by the cooperation of the second guide groove 14 and the second guide member 31, preventing deviation of the radially moving seat 3 during movement and further ensuring the accuracy of the transmission shaft detection. It is understood that there are two of each of the second guide groove 14 and the second guide member 31.

[0069] In a further technical solution, the second guide member 31 includes a second guide portion 311 and a second connecting portion 312, the second guide portion 311 is connected to the second connecting portion 312, the second guide groove 14 includes a second guide cavity 141 and a second connecting cavity 142, the second guide cavity 141 communicates with the second connecting cavity 142, the second guide portion 311 is installed in the second guide cavity 141, and the second connecting portion 312 passes through the second connecting cavity 142 and is connected to the radial moving seat 3.

[0070] It should be noted that the width of the second guide cavity 141 is greater than the width of the second connecting cavity 142, and both the second guide cavity 141 and the second connecting cavity 142 are rectangular. The cross-section of the second guide groove 14 is convex. When the radial moving seat 3 moves along the second lead screw 623, the second guide part 311 moves within the second guide cavity 141, and the second connecting part 312 moves within the second connecting cavity 142. The lower end of the second connecting part 312 is disposed within the second connecting cavity 142, and the upper end of the second connecting part 312 is threaded. The second connecting part 312 is screwed to the radial moving seat 3 via the thread. This arrangement further enhances the stability of the radial moving seat 3 when moving along the second lead screw 623, thereby improving the accuracy of the transmission shaft detection.

[0071] It is understandable that by setting up the radial moving mechanism 6, the control mechanism of the entire testing device can accurately control the moving distance of the radial moving seat 3. In cooperation with the axial moving mechanism 5, the accuracy of the test data is guaranteed, thereby improving work efficiency and increasing production capacity.

[0072] Example 2

[0073] A second aspect of the present invention provides a method for testing the torque fatigue resistance of a transmission shaft. This method is applicable to the torsional fatigue strength testing apparatus of Embodiment 1 and includes the following steps:

[0074] S1, circumferential moving seat 4 and axial moving seat 2 are used to fix the transmission shaft to be tested;

[0075] S2, axial moving mechanism 5, radial moving mechanism 6 and circumferential moving seat 4 respectively adjust the placement angle of the transmission shaft;

[0076] S3, the motor and reducer on the axial moving seat 2 output power to drive the transmission shaft to rotate for torque fatigue testing and obtain the test results.

[0077] By combining a motor and a gearbox, and outputting a sinusoidal torque at a specific frequency (e.g., 1Hz), the torsional fatigue strength of the drive shaft is tested to evaluate its fatigue performance. The application of this torsional fatigue strength testing device reduces the labor intensity of workers, improves work efficiency, and ultimately increases productivity.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments, as long as they meet the purpose of the present invention, and all such changes should be within the scope of protection claimed by the present invention. For example, different combinations of specific embodiments and different combinations of distinguishing technical features.

Claims

1. A torsional fatigue strength testing device, comprising a mounting base (1), an axially movable base (2), a radially movable base (3), and a circumferentially movable base (4), wherein the axially movable base (2) and the radially movable base (3) are respectively mounted on the mounting base (1), the circumferentially movable base (4) is mounted on the radially movable base (3), and the axially movable base (2) is equipped with a geared motor, characterized in that: Also includes: An axial moving mechanism (5) is installed on the mounting base (1), and its output end is connected to the axial moving seat (2) to drive the axial moving seat (2) to move along the axial direction. A radial moving mechanism (6) is installed on the mounting base (1), and its output end is connected to the radial moving base (3) to drive the radial moving base (3) to move in the radial direction.

2. The torsional fatigue strength testing device according to claim 1, characterized in that: The mounting base (1) has an axial groove (11). The axial moving mechanism (5) includes an axial drive (51) and an axial transmission assembly (52). The axial drive (51) is mounted on the mounting base (1), and the axial transmission assembly (52) is mounted on the axial groove (11). The output end of the axial drive (51) is connected to the axial transmission assembly (52), and the axial moving seat (2) is mounted on the output end of the axial transmission assembly (52).

3. The torsional fatigue strength testing device according to claim 2, characterized in that: The axial transmission assembly (52) includes a first support (521), a second support (522), a first lead screw (523), and a first nut seat (524). The first support (521) is installed at the first end of the axial groove (11), the second support (522) is installed at the second end of the axial groove (11), the two ends of the first lead screw (523) are respectively installed on the first support (521) and the second support (522), the inner side of the first nut seat (524) is sleeved on the first lead screw (523), and the outer side of the first nut seat (524) is installed on the axial moving seat (2).

4. The torsional fatigue strength testing device according to claim 1, characterized in that: The mounting base (1) has a first guide groove (12), and the bottom of the axial moving base (2) is equipped with a first guide member (21) corresponding to the first guide groove (12), and the first guide member (21) is slidably installed in the first guide groove (12).

5. The torsional fatigue strength testing device according to claim 4, characterized in that: The first guide member (21) includes a first guide portion (211) and a first connecting portion (212). The first guide portion (211) is connected to the first connecting portion (212). The first guide groove (12) includes a first guide cavity (121) and a first connecting cavity (122). The first guide cavity (121) communicates with the first connecting cavity (122). The first guide portion (211) is installed in the first guide cavity (121). The first connecting portion (212) passes through the first connecting cavity (122) and is connected to the axial moving seat (2).

6. The torsional fatigue strength testing device according to claim 1, characterized in that: The mounting base (1) has a radial groove (13). The radial moving mechanism (6) includes a radial drive (61) and a radial transmission assembly (62). The radial drive (61) is mounted on the mounting base (1), and the radial transmission assembly (62) is mounted on the radial groove (13). The output end of the radial drive (61) is connected to the radial transmission assembly (62), and the radial moving base (3) is mounted on the output end of the radial transmission assembly (62).

7. The torsional fatigue strength testing device according to claim 6, characterized in that: The radial transmission assembly (62) includes a third support (621), a fourth support (622), a second lead screw (623), and a second nut seat (624). The third support (621) is installed at the first end of the radial groove (13), the fourth support (622) is installed at the second end of the radial groove (13), the two ends of the second lead screw (623) are respectively installed on the third support (621) and the fourth support (622), the inner side of the second nut seat (624) is sleeved on the second lead screw (623), and the outer side of the second nut seat (624) is installed on the radial moving seat (3).

8. The torsional fatigue strength testing device according to claim 4, characterized in that: The mounting base (1) has a second guide groove (14), and the bottom of the radial moving base (3) is equipped with a second guide member (31) corresponding to the second guide groove (14), and the second guide member (31) is slidably installed in the first guide groove (12).

9. The torsional fatigue strength testing device according to claim 8, characterized in that: The second guide member (31) includes a second guide portion (311) and a second connecting portion (312). The second guide portion (311) is connected to the second connecting portion (312). The second guide groove (14) includes a second guide cavity (141) and a second connecting cavity (142). The second guide cavity (141) communicates with the second connecting cavity (142). The second guide portion (311) is installed in the second guide cavity (141). The second connecting portion (312) passes through the second connecting cavity (142) and is connected to the radial moving seat (3).

10. A method for testing the torque fatigue resistance of a drive shaft, characterized in that: The torsional fatigue strength testing apparatus according to any one of claims 1-9 comprises: S1, circumferential moving seat (4) and axial moving seat (2) are used to fix the transmission shaft to be tested; S2, the axial moving mechanism (5), the radial moving mechanism (6) and the circumferential moving seat (4) respectively adjust the placement angle of the transmission shaft; S3. The motor and reducer on the axial moving seat (2) output power to drive the transmission shaft to rotate for torque fatigue testing and obtain the test results.

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