Automatic tightening machine for flexible disc clutch of engine

Abstract

The invention discloses an automatic tightening machine for an engine flexible disc clutch, and relates to the technical field of tightening machines, the automatic tightening machine comprises a vertical frame, and further comprises a sliding table module, and the vertical frame linearly moves front and back through the sliding table module; the four tightening assemblies are arranged at the four corners of the front side of the vertical frame correspondingly, each tightening assembly comprises an XY linear module and a tightening shaft, and the tightening shafts linearly move in the transverse direction and the longitudinal direction through the XY linear modules; the camera shooting assembly is used for collecting images and is arranged at the top of the vertical frame; wherein the tightening end of the tightening shaft is fixedly provided with a spline shaft which is coaxially arranged with the tightening shaft. The tightening shafts can rotate automatically, namely when the tightening shafts make contact with the inner hole bolts, the spline sleeves on the tightening shafts can rotate automatically, so that the tightening blocks on the spline shafts are aligned with the inner hole bolts, the tightening blocks on the spline shafts are inserted into the inner hole bolts, manual adjustment is not needed, and the tightening efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tightening machines, in particular to an automatic tightening machine for an engine flexible disc clutch. Background Art

[0002] The automobile engine is a device that provides power for the car. It is the heart of the car and determines the car's power, economy, stability and environmental protection. Depending on the power source, automobile engines can be divided into diesel engines, gasoline engines, electric car motors and hybrid power.

[0003] The clutch is located in the flywheel housing between the engine and the gearbox. The clutch assembly is fixed to the rear plane of the flywheel with screws. The output shaft of the clutch is the input shaft of the gearbox. During the driving of the car, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and gearbox to cut off or transfer the power input from the engine to the transmission. The clutch is a commonly used component in mechanical transmission and can separate or engage the transmission system at any time.

[0004] After searching, the patent document with the authorization announcement number CN208409110U discloses an automatic tightening device for a flexible clutch, the tightening device includes a base, a mounting base, a positioning shaft and a tightening mechanism, the mounting base is arranged on the base, the positioning shaft is detachably arranged on the mounting base, and the tightening mechanism includes a plurality of tightening shafts arranged on the mounting base, and the plurality of tightening shafts are distributed around the positioning shaft; the patented technical solution performs synchronous tightening through a plurality of tightening shafts, and adopts different positioning shafts to adapt to clutches of different designs, which can reduce the wear of parts during the tightening process and is compatible with the installation of a plurality of engine clutches of different designs.

[0005] However, the above invention has the following shortcomings: the above invention uses a tightening shaft for tightening, that is, the inner hole bolt is tightened on the clutch through the tightening shaft, and one end of the tightening shaft must be inserted into the inner hole bolt. However, if one end of the tightening shaft and the inner hole bolt cannot be aligned, multiple tightening shafts must be inserted into each tightening shaft at the same time to work normally. Summary of the invention

[0006] The object of the present invention is to provide an automatic tightening machine for an engine flexible plate clutch to solve the problems raised in the above background technology.

[0007] The technical solution of the present invention is: an automatic tightening machine for an engine flexible disc clutch comprises a vertical frame and also comprises:

[0008] A slide module, through which the vertical frame moves linearly forward and backward;

[0009] Four sets of tightening assemblies, the four sets of tightening assemblies are respectively arranged at the four corners of the front side of the vertical frame, each set of tightening assemblies includes an XY linear module and a tightening shaft, and the tightening shaft is moved horizontally and vertically through the XY linear module;

[0010] A camera assembly for collecting images, wherein the camera assembly is arranged on the top of the vertical frame;

[0011] Among them, the tightening end of the tightening shaft is fixed with a spline shaft arranged coaxially therewith, a spline sleeve is provided on the sliding sleeve of the spline shaft, a tightening block is fixed to the front end of the spline sleeve, an elastic structure is provided between the rear end of the spline sleeve and the outer shell of the tightening shaft, a bevel gear ring is provided on the outer side of the spline sleeve, a one-way bearing is provided between the bevel gear ring and the spline sleeve so that the two can only rotate in one direction, a fixing block is fixed to the outer side of the spline sleeve, a rotating shaft is rotatably installed on the outer side of the fixing block, a driven gear and a bevel gear body are respectively fixed at both ends of the rotating shaft, the bevel gear body is meshed with the bevel gear ring, and a toothed plate meshed with the driven gear is fixed to the outer shell of the tightening shaft.

[0012] Preferably, the slide module includes a slide body and a plurality of first guide mechanisms, wherein the first guide mechanism includes a first guide rail and a first slider slidably mounted on the first guide rail, the first guide rail is fixed to the slide, and the first slider is fixed to the vertical frame.

[0013] Preferably, the slide module also includes a driving mechanism, wherein the driving mechanism includes a servo motor, a screw body and a connecting block, both ends of the screw body are rotatably mounted in the slide body through bearing seats, the outer casing of the servo motor is fixed in the slide body, the output shaft of the servo motor is fixed to the coaxial coupling of the screw body, a nut sleeve matching the screw body is installed on the outer side of the screw body, the connecting block is fixed to the nut sleeve, and the connecting block is fixed to the vertical frame.

[0014] Preferably, the XY linear module includes a first electric cylinder, a second electric cylinder and a first fixed frame, the outer shell of the tightening shaft is fixed to the first fixed frame, the outer shell of the first electric cylinder is fixed on the vertical frame, and the moving end of the first electric cylinder moves along the longitudinal direction, the outer shell of the second electric cylinder is fixed on the moving end of the first electric cylinder, and the moving end of the second electric cylinder moves in the transverse direction, and the outer side of the first fixed frame is fixed on the moving end of the second electric cylinder.

[0015] Preferably, the camera assembly includes a cylinder, a third fixing frame is fixedly installed on one end of the cylinder body shell of the cylinder, the cylinder is fixed at the middle position of the top of the vertical frame through the third fixing frame, the telescopic end of the cylinder is fixed with a second fixing frame, and a CDD camera is fixed inside the second fixing frame.

[0016] Preferably, the camera assembly also includes a vertical plate, a plurality of second guide mechanisms are arranged on the front side of the vertical plate, the second guide mechanisms include a second guide rail and a second slider slidably mounted on the second guide rail, the outer side of the second slider is fixed to the vertical plate, and a displacement sensor is installed on one side of the vertical plate.

[0017] Preferably, the camera assembly also includes a lighting board, a fourth fixing frame is fixed to the front side of the second fixing frame, the back side of the lighting board is fixedly installed on the front side of the fourth fixing frame, a through hole is opened at the center position of the lighting board, and the camera end of the CDD camera is aligned with the through hole.

[0018] Preferably, the elastic structure comprises a spring, a first fixing ring and a second fixing ring, both ends of the spring are respectively fixed to the first fixing ring and the second fixing ring, the first fixing ring is coaxially fixed to the tightening shaft housing, and the second fixing ring is rotatably mounted on the spline sleeve.

[0019] The present invention provides an automatic tightening machine for an engine flexible disc clutch by improvement, which has the following beneficial effects compared with the prior art:

[0020] First, each tightening shaft of the present invention can rotate automatically, that is, when the tightening shaft contacts the inner hole bolt, the spline sleeve on the tightening shaft can rotate automatically, so that the tightening block on the spline shaft is aligned with the inner hole bolt, so that the tightening block on the spline shaft is inserted into the inner hole bolt without manual adjustment, thereby improving the tightening efficiency;

[0021] Second, the traditional clutch tightening is generally done manually, but this method is inefficient; the present invention can automatically identify the position of the inner hole bolt (identified by the photographic component), and through the image acquisition of the photographic component, the tightening shaft is moved to the tightening position and fed in for tightening, which can be compatible with many models. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the slide module of the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the tightening assembly of the present invention;

[0026] Figure 4 It is a schematic diagram of the camera assembly and the vertical frame structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the camera assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the camera assembly without the lighting board of the present invention;

[0029] Figure 7 It is a schematic diagram of the bottom area structure of the photographic assembly of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the tightening shaft of the present invention.

[0031] Reference numerals:

[0032] 1. Slide module; 2. Driving mechanism; 3. Tightening assembly; 4. Camera assembly; 5. Vertical frame; 6. Slide body; 7. First guide mechanism; 8. Servo motor; 9. Connecting block; 10. Screw body; 11. First electric cylinder; 12. Second electric cylinder; 13. First fixed frame; 14. Tightening shaft; 15. Illuminating board; 16. Vertical board; 17. Second guide mechanism; 18. Displacement sensor; 19. Cylinder; 20. Second fixed frame; 21. CDD camera; 22. Third fixed frame; 23. Fourth fixed frame; 24. Spline shaft; 25. Spring; 26. First fixing ring; 27. Second fixing ring; 28. Bevel gear ring; 29. ​​One-way bearing; 30. Fixed block; 31. Bevel gear body; 32. Spline sleeve; 33. Tightening block; 34. Tooth plate; 35. Driven gear. DETAILED DESCRIPTION

[0033] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides an automatic tightening machine for an engine flexible disc clutch by improvement. The technical solution of the present invention is:

[0035] like Figures 1 to 8 As shown, the embodiment of the present invention provides an automatic tightening machine for an engine flexible disc clutch, comprising a vertical frame 5, the vertical frame 5 being a steel structure, and further comprising:

[0036] Combined with Figure 1 and attached Figure 2As shown, the slide module 1 and the vertical frame 5 move forward and backward in a straight line through the slide module 1;

[0037] Furthermore, combined with Figure 2 As shown, the slide module 1 includes a slide body 6 and a plurality of first guide mechanisms 7, wherein the first guide mechanism 7 includes a first guide rail and a first slider slidably mounted on the first guide rail, the first guide rail is fixed to the slide, the first slider is fixed to the vertical frame 5, and the first guide mechanism 7 is arranged to enable the vertical frame 5 to move linearly only above the slide body 6.

[0038] Furthermore, combined with Figure 1 and attached Figure 2 As shown, the slide module 1 also includes a driving mechanism 2, wherein the driving mechanism 2 includes a servo motor 8, a screw body 10 and a connecting block 9, both ends of the screw body 10 are rotatably installed in the slide body 6 through bearing seats, the outer shell of the servo motor 8 is fixed in the slide body 6, the output shaft of the servo motor 8 is fixed to the coaxial coupling of the screw body 10, and a nut sleeve matching the screw body 10 is installed on the outer side of the screw body 10. The nut sleeve is supplemented with a ball nut sleeve commonly used in the prior art; the connecting block 9 is fixed to the nut sleeve, and the connecting block 9 is fixed to the vertical frame 5; it can be seen from the above connection relationship that the servo motor 8 causes the screw body 10 to rotate axially through the output shaft, the nut sleeve on the screw body 10 moves along the screw, and the nut sleeve drives the vertical frame 5 to move through the connecting block 9.

[0039] Combined with Figure 1 and attached Figure 3 As shown, four sets of tightening components 3 are respectively arranged at the four corners of the front side of the vertical frame 5, and each set of tightening components 3 includes an XY linear module and a tightening shaft 14. Here, the tightening shaft 14 is supplemented. The tightening shaft 14 is electric; the tightening shaft 14 is moved horizontally and vertically through the XY linear module;

[0040] Furthermore, combined with Figure 3 As shown, the XY linear module includes a first electric cylinder 11, a second electric cylinder 12 and a first fixed frame 13. The housing of the tightening shaft 14 is fixed to the first fixed frame 13. The housing of the first electric cylinder 11 is fixed to the vertical frame 5, and the moving end of the first electric cylinder 11 moves along the longitudinal direction. The housing of the second electric cylinder 12 is fixed to the moving end of the first electric cylinder 11, and the moving end of the second electric cylinder 12 moves in the transverse direction. The outer side of the first fixed frame 13 is fixed to the moving end of the second electric cylinder 12. This is a supplementary explanation of the first electric cylinder 11 and the second electric cylinder 12. Figure 3The first electric cylinder 11 and the second electric cylinder 12 shown are both embedded electric cylinders, mainly to save space, but the first electric cylinder 11 and the second electric cylinder 12 may not be embedded electric cylinders, and their specific models are not specifically limited here; the moving end of the first electric cylinder 11 drives the second electric cylinder 12 to move up and down in a straight line, and the moving end of the second electric cylinder 12 drives the fixed frame to move laterally.

[0041] Combined with Figure 3-Figure 7 As shown, a camera assembly 4 for collecting images is provided on the top of a vertical frame 5;

[0042] Furthermore, combined with Figure 6 and Figure 7 As shown, the camera assembly 4 includes a cylinder 19, a third fixing frame 22 is fixedly installed at one end of the cylinder body shell of the cylinder 19, the cylinder 19 is fixed to the middle position of the top of the vertical frame 5 through the third fixing frame 22, and a second fixing frame 20 is fixed to the telescopic end of the cylinder 19, and a CDD camera 21 is fixed inside the second fixing frame 20. Here, the CDD camera 21 is supplemented. The CDD camera 21 is used for image acquisition, and the CDD camera 21 can also be replaced by a 3D camera; the cylinder 19 drives the CDD camera 21 to move up and down in the form of telescoping.

[0043] Furthermore, combined with Figure 4 and Figure 5 As shown, the camera assembly 4 also includes a vertical plate 16, and a plurality of second guide mechanisms 17 are arranged on the front side of the vertical plate 16. The second guide mechanism 17 includes a second guide rail and a second slider slidably mounted on the second guide rail, and the outer side of the second slider is fixed on the vertical plate 16; the second guide mechanism 17 is arranged to enable the vertical plate 16 to move linearly up and down on the vertical frame 5; a displacement sensor 18 is installed on one side of the vertical plate 16, and the displacement sensor 18 is arranged to detect the up and down movement distance of the vertical plate 16.

[0044] Furthermore, combined with Figure 5 , Figure 6 and Figure 7 As shown, the camera assembly 4 also includes a lighting board 15, a fourth fixing frame 23 is fixed to the front side of the second fixing frame 20, the back side of the lighting board 15 is fixedly installed on the front side of the fourth fixing frame 23, a through hole is opened at the center position of the lighting board 15, and the camera end of the CDD camera 21 is aligned with the through hole; the lighting board 15 is used for lighting, so that the CDD camera 21 can clearly capture the image.

[0045] Among them, combined with Figure 8 As shown, the tightening end of the tightening shaft 14 is fixed with a spline shaft 24 coaxially arranged therewith, and a spline sleeve 32 is provided on the spline shaft 24 for sliding, and the spline sleeve 32 can slide linearly along the spline shaft 24; a tightening block 33 is fixed to the front end of the spline sleeve 32, Figure 8 The tightening block 33 shown is a square block, or it can be a hexagonal block, which is mainly formulated according to the hole shape of the inner hole bolt, or the remaining connecting ends that can adapt to the inner hole bolt are installed at the front end of the spline sleeve 32; an elastic structure is arranged between the rear end of the spline sleeve 32 and the outer shell of the tightening shaft 14, and the elastic structure includes a spring 25, a first fixing ring 26 and a second fixing ring 27. The two ends of the spring 25 are respectively fixed to the first fixing ring 26 and the second fixing ring 27. The first fixing ring 26 is coaxially fixed to the outer shell of the tightening shaft 14, and the second fixing ring 27 is rotatably mounted on the spline sleeve 32. During the backward movement of the spline sleeve 32, the spring 25 is compressed, and the setting of the elastic structure allows the spline sleeve 32 and the spline shaft 24 to elastically expand and contract; a bevel gear ring 28 is arranged on the outer side of the spline sleeve 32, and a one-way bearing 29 that allows the bevel gear ring 28 and the spline sleeve 32 to rotate only in one direction is arranged between the bevel gear ring 28 and the spline sleeve 32. A fixed block 30 is fixed, and a rotating shaft is rotatably installed on the outer side of the fixed block 30. A driven gear 35 and a bevel gear body 31 are fixed to both ends of the rotating shaft. The bevel gear body 31 meshes with the bevel gear ring 28. The outer shell of the tightening shaft 14 is fixed with a tooth plate 34 meshing with the driven gear 35. When the spline sleeve 32 contacts the inner hole bolt, when the tightening block 33 on the spline sleeve 32 is not aligned with the inner hole of the inner hole bolt, the spline sleeve 32 moves backward, and the spring The spring 25 is compressed, and the driven gear 35 on the spline sleeve 32 moves backward. The driven gear 35 is moved by the rack, and the driven gear 35 drives the bevel gear body 31 to rotate through the rotating shaft. The bevel gear body 31 moves the bevel gear ring 28, and the bevel gear ring 28 drives the spline sleeve 32 to rotate through the one-way bearing 29 until the tightening block 33 on the spline sleeve 32 is aligned with the inner hole of the inner hole bolt, and the spring 25 is reset to insert the tightening block 33 into the inner hole bolt.

[0046] Working principle: A tooling is set in front of the whole tightening machine, which is used to fix the clutch. Each bolt positioning hole of the clutch is pre-tightened with the inner hole bolt;

[0047] The lighting lamp illuminates the clutch in front, so that the CDD camera 21 can clearly capture the image. The cylinder 19 drives the CDD camera 21 to move up and down in the form of extension and contraction, so that the CDD camera 21 can capture the clutch image more comprehensively.

[0048] The collected clutch image is sent to the computer, and the computer's built-in recognition algorithm is used for recognition, thereby controlling each XY linear module. The moving end of the first electric cylinder 11 of the XY linear module drives the second electric cylinder 12 of the XY linear module to move up and down linearly, and the moving end of the second electric cylinder 12 of the XY linear module drives the fixed frame to move horizontally, so that the tightening shaft 14 on the fixed frame can be aligned with the inner hole bolt;

[0049] The servo motor 8 causes the screw body 10 to rotate axially through the output shaft, and the nut sleeve on the screw body 10 moves along the screw, and the nut sleeve drives the vertical frame 5 to move through the connecting block 9, so that the tightening shaft 14 on the vertical frame 5 contacts the inner hole bolt;

[0050] When the spline sleeve 32 contacts the inner hole bolt, when the tightening block 33 on the spline sleeve 32 is not aligned with the inner hole of the inner hole bolt, the spline sleeve 32 moves backward, the spring 25 is compressed, and the driven gear 35 on the spline sleeve 32 moves backward accordingly. The driven gear 35 is moved by the rack, and the driven gear 35 drives the bevel gear body 31 to rotate through the rotating shaft. The bevel gear body 31 moves the bevel gear ring 28, and the bevel gear ring 28 drives the spline sleeve 32 to rotate through the one-way bearing 29 until the tightening block 33 on the spline sleeve 32 is aligned with the inner hole of the inner hole bolt, and the spring 25 is reset to insert the tightening block 33 into the inner hole bolt.

[0051] After the tightening blocks 33 on each tightening shaft 14 are inserted into the inner hole bolt, each tightening shaft 14 is started synchronously to perform the tightening work.

[0052] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic tightening machine for an engine flexible disc clutch, comprising a vertical frame (5), characterized in that: Also includes: A slide module (1), wherein the vertical frame (5) moves forward and backward in a straight line through the slide module (1); Four sets of tightening assemblies (3), the four sets of tightening assemblies (3) are respectively arranged at four corners of the front side of the vertical frame (5), each set of tightening assemblies (3) comprises an XY linear module and a tightening shaft (14), and the tightening shaft (14) is moved linearly in the horizontal and vertical directions through the XY linear module; A camera assembly (4) for capturing images, wherein the camera assembly (4) is arranged on the top of the vertical frame (5); The tightening end of the tightening shaft (14) is fixed with a spline shaft (24) coaxially arranged therewith, a spline sleeve (32) is provided on the spline shaft (24) for sliding, a tightening block (33) is fixed at the front end of the spline sleeve (32), an elastic structure is provided between the rear end of the spline sleeve (32) and the outer shell of the tightening shaft (14), a bevel gear ring (28) is provided on the outer side of the spline sleeve (32), a one-way bearing (29) is provided between the bevel gear ring (28) and the spline sleeve (32) so that both can only rotate in one direction, a fixing block (30) is fixed on the outer side of the spline sleeve (32), a rotating shaft is rotatably installed on the outer side of the fixing block (30), a driven gear (35) and a bevel gear body (31) are respectively fixed at both ends of the rotating shaft, the bevel gear body (31) is meshed with the bevel gear ring (28), and a toothed plate (34) meshed with the driven gear (35) is fixed to the outer shell of the tightening shaft (14).

2. The automatic tightening machine for the engine flexible disc clutch according to claim 1, characterized in that: The slide module (1) comprises a slide body (6) and a plurality of first guide mechanisms (7), wherein the first guide mechanism (7) comprises a first guide rail and a first slider slidably mounted on the first guide rail, the first guide rail is fixed to the slide, and the first slider is fixed to the vertical frame (5).

3. The automatic tightening machine for the engine flexible disc clutch according to claim 2, characterized in that: The slide module (1) also includes a driving mechanism (2), wherein the driving mechanism (2) includes a servo motor (8), a screw body (10) and a connecting block (9), both ends of the screw body (10) are rotatably mounted in the slide body (6) through a bearing seat, the housing of the servo motor (8) is fixed in the slide body (6), the output shaft of the servo motor (8) is fixed to the screw body (10) by a coaxial coupling, the outer side of the screw body (10) is installed with a nut sleeve matching it, the connecting block (9) is fixed to the nut sleeve, and the connecting block (9) is fixed to the vertical frame (5).

4. The automatic tightening machine for the engine flexible disc clutch according to claim 1, characterized in that: The XY linear module comprises a first electric cylinder (11), a second electric cylinder (12) and a first fixed frame (13); the outer shell of the tightening shaft (14) is fixed to the first fixed frame (13); the outer shell of the first electric cylinder (11) is fixed to the vertical frame (5), and the moving end of the first electric cylinder (11) moves along the longitudinal direction; the outer shell of the second electric cylinder (12) is fixed to the moving end of the first electric cylinder (11), and the moving end of the second electric cylinder (12) moves in the transverse direction; the outer side of the first fixed frame (13) is fixed to the moving end of the second electric cylinder (12).

5. The automatic tightening machine for the engine flexible disc clutch according to claim 1, characterized in that: The camera assembly (4) comprises a cylinder (19), a third fixing frame (22) is fixedly mounted on one end of a cylinder shell of the cylinder (19), the cylinder (19) is fixed to the middle position of the top of the vertical frame (5) through the third fixing frame (22), a second fixing frame (20) is fixed to the telescopic end of the cylinder (19), and a CDD camera (21) is fixed inside the second fixing frame (20).

6. The automatic tightening machine for the engine flexible disc clutch according to claim 5, characterized in that: The camera assembly (4) further comprises a vertical plate (16), a plurality of second guide mechanisms (17) are arranged on the front side of the vertical plate (16), the second guide mechanisms (17) comprise a second guide rail and a second slider slidably mounted on the second guide rail, the outer side of the second slider is fixed on the vertical plate (16), and a displacement sensor (18) is installed on one side of the vertical plate (16).

7. The automatic tightening machine for the engine flexible disc clutch according to claim 6, characterized in that: The camera assembly (4) further comprises a lighting board (15), a fourth fixing frame (23) being fixed to the front side of the second fixing frame (20), the back side of the lighting board (15) being fixedly mounted to the front side of the fourth fixing frame (23), a through hole being provided at the center of the lighting board (15), and the camera end of the CDD camera (21) being aligned with the through hole.

8. The automatic tightening machine for engine flexible disc clutch according to claim 1, characterized in that: The elastic structure comprises a spring (25), a first fixing ring (26) and a second fixing ring (27); the two ends of the spring (25) are respectively fixed to the first fixing ring (26) and the second fixing ring (27); the first fixing ring (26) is coaxially fixed to the outer shell of the tightening shaft (14); and the second fixing ring (27) is rotatably mounted on the spline sleeve (32).

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