A built-in frequency-adjustable transmission shaft dynamic vibration absorber

Abstract

The present invention discloses a transmission shaft dynamic vibration absorber, which is arranged in the transmission shaft and specifically comprises: a rubber cylinder, on the outer circumferential surface of which a first boss and a second boss are arranged, the top surface of the first boss is higher than the top surface of the second boss, and the top surface of the second boss is an arc-shaped surface along the axial direction of the rubber cylinder; a main shaft, which is arranged in the rubber cylinder, and the two ends of the main shaft in the axial direction are respectively provided with threaded rods; end covers arranged in pairs, which are threadedly connected to the threaded rod through a threaded hole at the center; a plurality of pressing sheets, which are evenly distributed along the circumferential surface of the inner wall of the rubber cylinder, the pressing sheets and the inner surface of the rubber cylinder are vulcanized, and there is a spacing between each pressing sheet; a connecting rod, one end of which is connected to the end cover, and the other end is hinged to the pressing sheet; when the main shaft rotates around its own axis, it will drive the end covers arranged in pairs to move relative to or opposite to each other along the axial direction of the main shaft, and make the pressing sheet move in the radial direction of the rubber cylinder, so as to adjust the size of the area in which the top surface of the second boss of the rubber cylinder contacts the inner surface of the transmission shaft.

Description

Technical Field

[0001] The invention relates to a vibration reduction and noise reduction device, in particular to a transmission shaft dynamic vibration absorber. Background Art

[0002] In recent years, as drivers and passengers have higher requirements for automobile vibration and noise reduction performance, many automobile manufacturers have begun to invest more R&D costs and time to improve the vibration and noise reduction performance of automobiles, thereby improving product user satisfaction.

[0003] Currently, dynamic vibration absorbers are widely used in the field of vibration and noise reduction. They can attenuate the vibration amplitude of mechanical structures at specific frequencies and improve the ride comfort of the entire vehicle.

[0004] In the actual use of the car, for the front-engine front-wheel drive car, due to the excitation of the engine, the transmission shaft will resonate at a specific frequency during the rotation process, and cause the vibration noise in the car to become abnormally large, affecting the ride comfort of the car. Therefore, in order to eliminate the resonance of the transmission shaft, a transmission shaft dynamic vibration absorber is generally used to reduce the vibration amplitude of the transmission shaft at a specific frequency.

[0005] Research has found that for a traditional hollow transmission shaft, the internal transmission shaft dynamic vibration absorber is generally composed of a cylindrical rubber and an internal metal block, and the rubber is an elastic member and the metal block is a mass block, which can better attenuate the resonance of the transmission shaft. However, the rubber stiffness of the transmission shaft dynamic vibration absorber and the mass of the metal block are fixed, so the frequency of the transmission shaft dynamic vibration absorber is also fixed, and its versatility is poor.

[0006] Based on this, in order to solve the differences existing in the above-mentioned prior arts, the present invention provides a new built-in adjustable frequency transmission shaft dynamic vibration absorber, which can adjust the frequency of the transmission shaft dynamic vibration absorber by changing the radial stiffness of the rubber tube and its own counterweight, and is therefore suitable for hollow transmission shafts of different structures and sizes. Summary of the invention

[0007] One of the purposes of the present invention is to provide a built-in adjustable frequency transmission shaft dynamic vibration absorber, which can adjust the radial stiffness of the rubber tube by applying radial pre-compression to the rubber tube, and the counterweight of the transmission shaft dynamic vibration absorber is also adjustable, so that the frequency of the transmission shaft dynamic vibration absorber can be adjusted and changed. Therefore, it can be suitable for hollow transmission shafts of different structures and sizes, and its scope of use is very wide, and it has good prospects for promotion and application.

[0008] In order to achieve the above object, the present invention proposes a built-in adjustable frequency transmission shaft dynamic vibration absorber, which is arranged in the transmission shaft, and the transmission shaft dynamic vibration absorber includes:

[0009] A rubber tube, wherein a first boss and a second boss are provided on the outer circumferential surface thereof, wherein the top surface of the first boss is higher than the top surface of the second boss, and the top surface of the second boss is an arc-shaped surface along the axial direction of the rubber tube;

[0010] A main shaft, which is arranged in the rubber tube, and has threaded rods at both ends of the main shaft in the axial direction;

[0011] The end caps are arranged in pairs and are respectively threadedly connected to the threaded rods through threaded holes at the center;

[0012] A plurality of pressing sheets are evenly distributed along the inner circumference of the rubber tube, the pressing sheets are vulcanized with the inner surface of the rubber tube, and there is a spacing between the pressing sheets;

[0013] A connecting rod, one end of which is connected to the end cover, and the other end of which is hinged to the pressing sheet;

[0014] When the main shaft rotates around its own axis, it drives the paired end covers to move relative to or away from each other along the axial direction of the main shaft, thereby driving the pressing plate to move in the radial direction of the rubber tube to adjust the size of the contact area between the top surface of the second boss of the rubber tube and the inner surface of the transmission shaft.

[0015] Furthermore, in the transmission shaft dynamic vibration absorber of the present invention, the first boss and the second boss are arranged at intervals along the circumferential direction of the rubber tube.

[0016] Furthermore, in the transmission shaft dynamic vibration absorber described in the present invention, the radial cross-section of the first boss is rectangular or trapezoidal.

[0017] Furthermore, in the transmission shaft dynamic vibration absorber described in the present invention, the radial cross-section of the second boss is semicircular.

[0018] Furthermore, in the transmission shaft dynamic vibration absorber described in the present invention, the main shaft includes a counterweight block located in the middle, and the threaded rod extends from the axial end of the counterweight block.

[0019] Furthermore, in the transmission shaft dynamic vibration absorber described in the present invention, the end of the threaded rod has a groove.

[0020] Furthermore, in the transmission shaft dynamic vibration absorber described in the present invention, the pressing plate includes an arc-shaped tile portion and a rib extending in a radial direction, and the rib is hinged to the connecting rod.

[0021] Furthermore, in the transmission shaft dynamic vibration absorber described in the present invention, the outer circumferential surface of the end cover has a plurality of mounting hole seats extending radially outward, the mounting hole seats are provided with mounting holes, and the end cover is connected to the connecting rod through the mounting holes and pins.

[0022] Furthermore, the transmission shaft dynamic vibration absorber described in the present invention also includes replaceable counterweight rings arranged in pairs, which are arranged on the main shaft, and each counterweight ring is correspondingly located on the outer side of each end cover.

[0023] Furthermore, the transmission shaft dynamic vibration absorber described in the present invention also includes nuts arranged in pairs, which are threadedly connected to the threaded rod, and each nut is correspondingly arranged on the outer side of each counterweight ring.

[0024] Compared with the prior art, the built-in adjustable frequency transmission shaft dynamic vibration absorber of the present invention has the following advantages:

[0025] In order to overcome the defects existing in the prior art, the inventors have optimized the design of the structure of the drive shaft dynamic vibration absorber, and have obtained a new built-in adjustable frequency drive shaft dynamic vibration absorber, which applies radial pre-compression to the rubber tube by rotating the main shaft to adjust the stiffness of the drive shaft dynamic vibration absorber, and can adjust the mass of the drive shaft dynamic vibration absorber by changing the mass of the counterweight ring, thereby changing the frequency of the drive shaft dynamic vibration absorber.

[0026] The built-in adjustable frequency transmission shaft dynamic vibration absorber of the present invention can effectively avoid the defects of traditional solutions, is easy to install and adjust, and can be applied to transmission shafts of different structures. It has a relatively broad application prospect in the field of automobile vibration reduction and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0028] Figure 2 It is a structural explosion diagram of the transmission shaft dynamic vibration absorber in one embodiment of the present invention.

[0029] Figure 3 It is a schematic structural diagram of a rubber tube of a transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0030] Figure 4 It is a schematic structural diagram of the main shaft of the transmission shaft dynamic vibration absorber described in the present invention in one embodiment.

[0031] Figure 5 It is a schematic structural diagram of an end cover of the transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0032] Figure 6 It is a schematic structural diagram of a connecting rod of a transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0033] Figure 7It is a schematic structural diagram of a pressing plate of the transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0034] Figure 8 The schematic diagram shows the structure of the main shaft, end cover, pressing sheet and connecting rod after matching according to the present invention.

[0035] Fig. 9 It is a schematic structural diagram of a counterweight ring of a transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0036] Fig.10 for Figure 1 The structural front view of the transmission shaft dynamic vibration absorber is shown.

[0037] Fig.11 for Fig.10 AA section view shown.

[0038] Fig.12 for Fig.11 BB cross-section shown.

[0039] Fig.13 The diagram schematically shows the rotation angle θ and the direction of the radial stiffness K of the transmission shaft dynamic vibration absorber according to the present invention.

[0040] Fig.14 The figure schematically shows the rotation angle-radial stiffness curve of the transmission shaft dynamic vibration absorber according to the present invention.

[0041] Fig.15 The rotation angle-natural frequency curve of the transmission shaft dynamic vibration absorber described in the present invention is schematically shown. DETAILED DESCRIPTION

[0042] The built-in adjustable frequency transmission shaft dynamic vibration absorber of the present invention will be further explained and illustrated below in conjunction with the drawings and specific embodiments of the specification. However, such explanation and illustration do not constitute an improper limitation on the technical solution of the present invention.

[0043] In the present invention, in order to explain the transmission shaft dynamic vibration absorber of the present invention in detail, the inventor specifically designs the following Figure 1 A transmission shaft dynamic vibration absorber is shown. Figure 1 It is a schematic diagram of the overall structure of the transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0044] Figure 2 It is a structural explosion diagram of the transmission shaft dynamic vibration absorber in one embodiment of the present invention.

[0045] like Figure 1 and Figure 2As shown, in this embodiment, the transmission shaft dynamic vibration absorber designed by the present invention is specifically installed inside the transmission shaft 1. Among them, the transmission shaft dynamic vibration absorber designed by the present invention specifically includes: a rubber tube 2, six pressing plates 3, two nuts 4, two counterweight rings 5, a main shaft 6, two end covers 7, twenty-four connecting rods 8 and twelve pins 9.

[0046] Figure 3 It is a schematic structural diagram of a rubber tube of a transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0047] like Figure 3 As shown, in this embodiment, the outer surface of the rubber tube 2 designed by the present invention is provided with a first boss 19 and a second boss 18, and the first boss 19 and the second boss 18 are arranged at intervals along the circumferential direction of the rubber tube. Among them, the top surface of the first boss 19 is higher than the top surface of the second boss 18, and the top surface of the second boss 18 is an arc surface along the axial direction of the rubber tube 2.

[0048] In the present invention, the top surface of the first boss 19 is designed to fit tightly with the inner surface of the transmission shaft 1, and the radial cross section of the first boss 19 is approximately rectangular. Of course, in some other embodiments, it can be approximately a trapezoidal cross section.

[0049] Correspondingly, the radial cross section of the designed second boss 18 is semicircular, and along the axial direction of the transmission shaft 1, the semicircular area of ​​the radial cross section gradually decreases from the middle to both sides, approximately forming a semi-spindle.

[0050] Figure 4 It is a schematic structural diagram of the main shaft of the transmission shaft dynamic vibration absorber described in the present invention in one embodiment.

[0051] like Figure 4 As shown, refer to Figure 1 and Figure 2 In this embodiment, the main shaft 6 is correspondingly arranged in the rubber tube 2, and the main shaft 6 is a left-right symmetrical structure, which is composed of a counterweight block 10 located in the middle and threaded rods 11 at both ends.

[0052] In the present invention, the two ends of the main shaft 6 in the axial direction are respectively provided with threaded rods 11, and the threaded rods 11 extend from the axial ends of the counterweight 10 to both ends. In this embodiment, the external threads on the two threaded rods 11 arranged at the two ends of the main shaft 6 have opposite rotation directions, which can be used for threaded connection with the end caps 7 arranged in pairs.

[0053] In addition, see Figure 4 It can be seen that in the spindle 6 designed by the present invention, the end of the threaded rod 11 thereof has a groove 12 , through which an operator can use a screwdriver to rotate the spindle 6 .

[0054] Figure 5 It is a schematic structural diagram of an end cover of the transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0055] like Figure 5 As shown, in this embodiment, a threaded hole 14 is opened at the center of the paired end covers 7 designed by the present invention, and the threaded hole 14 has an internal thread, which can be matched with the external thread on the threaded rod 11 to achieve a threaded connection between the two end covers 7 and the main shaft 6.

[0056] Accordingly, see further Figure 5 It can be seen that in this embodiment, the outer circumferential surface of the end cover 7 designed by the present invention is also provided with 6 mounting hole seats extending radially outward from the center of the end cover 7, and each mounting hole seat is provided with a mounting hole 13.

[0057] In the present invention, the mounting hole 13 in the designed end cover 7 can be connected to the two connecting rods 8 by cooperating with the pin 9. One end of these connecting rods 8 is connected to the end cover 7, and the other end thereof is correspondingly hinged to the designed pressing piece 3. The structure of the connecting rod is shown in FIG. Figure 6 . Figure 6 It is a schematic structural diagram of a connecting rod of a transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0058] In the present invention, since each end cover 7 is designed to have 6 mounting holes 13, and each mounting hole 13 needs to correspond to two connecting rods 8 and one pin 9. Therefore, in the present invention, 24 connecting rods 8 and 12 pins 9 are specifically designed and used.

[0059] Figure 7 It is a schematic structural diagram of a pressing plate of the transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0060] like Figure 7 As shown, in this embodiment, six pressing sheets 3 are correspondingly arranged in the transmission shaft dynamic vibration absorber of the present invention, and are evenly distributed along the circumferential surface of the inner wall of the rubber tube 2 .

[0061] See also Figure 7 It can be seen that in this embodiment, each pressing sheet 3 includes: a rib 15, a through hole 16 and a tile 17. The tile 17 is an arc-shaped structure, which can be vulcanized together with the inner wall of the rubber tube 2. On the circumference of the inner wall of the rubber tube 2, there is an appropriate distance between each tile 17, that is, there is a certain spacing between each pressing sheet 3. The transmission shaft dynamic vibration absorber described in the present invention has a total of 6 evenly distributed pressing sheets 3, and the spacing angle between adjacent pressing sheets 3 is 60°.

[0062] It should be noted that, in the present embodiment, the ribs 15 in each pressing sheet 3 extend in the radial direction, and the through holes 16 are correspondingly opened on the ribs 15 , and the connecting rod 8 can be hinged to the ribs 15 by using the through holes 16 .

[0063] Figure 8 The schematic diagram shows the structure of the main shaft, end cover, pressing sheet and connecting rod after matching according to the present invention.

[0064] like Figure 8 As shown, in this embodiment, when the main shaft 6 rotates, the two end caps 7 will move toward or away from each other along the axis of the main shaft 6, and the end caps 7 can drive the pressing sheet 3 to move along the radial direction of the rubber tube 2 through the connecting rod 8, thereby changing the radial compression of the rubber tube 2. The stiffness of rubber has a nonlinear characteristic, which increases with the increase of radial compression. Therefore, the larger the rotation angle θ of the main shaft 6, the greater the radial compression of the rubber tube 2, and its radial stiffness K will also increase.

[0065] To summarize, when the main shaft 6 is rotated to make the pressing plate 3 move radially outward along the rubber tube 2, due to the special structure of the second boss 18, the middle position of the top surface of the second boss 18 contacts the inner surface of the transmission shaft 1 first, and gradually expands to both ends, thereby adjusting the size of the area where the top surface of the second boss 18 of the rubber tube 2 contacts the inner surface of the transmission shaft 1, so that the radial stiffness K of the rubber tube 2 becomes larger, thereby realizing the adjustment of the stiffness.

[0066] It should be noted that in the present invention, when the two end covers 7 move toward or away from each other along the axis of the main shaft 6, the displacement of the two end covers 7 along the axis of the main shaft 6 is equal, and the two end covers 7 are connected to the pressing plate 3 through the connecting rod 8. Therefore, the radial displacement of the through holes 16 at both ends of the pressing plate 3 along the rubber tube 2 is also equal, which also ensures that the center of mass position of the dynamic vibration absorber remains unchanged.

[0067] Fig. 9 It is a schematic structural diagram of a counterweight ring of a transmission shaft dynamic vibration absorber according to one embodiment of the present invention.

[0068] It should be noted that, in order to facilitate the adjustment of the counterweight of the transmission shaft dynamic vibration absorber, the invention further designs a pair of replaceable counterweight rings 5. Since the two ends of each connecting rod 8, the end hinged to the rib plate 15 is on the outside, and the end connected to the end cover 7 is on the inside, the threaded rods 11 at both ends of the main shaft 6 have enough space for installing the counterweight ring 5 and the nut 4.

[0069] like Fig. 9 As shown, combined with Figure 2 It can be seen that in this embodiment, the replaceable counterweight rings 5 ​​designed in the present invention and arranged in pairs can be correspondingly arranged on the main shaft 6 and specifically arranged on the outer side of each end cover 7 .

[0070] In actual application, the operator can adjust the mass of the counterweight ring 5 as needed, and fix the counterweight ring 5 on the main shaft 6 through the nut 4. The nut 4 can be effectively threadedly connected with the external thread of the threaded rod 11, and each nut 4 is correspondingly arranged on the outside of each counterweight ring 5. The total mass of the counterweight block 10 of the main shaft 6 and the counterweight ring 5 constitutes the equivalent mass of the transmission shaft dynamic vibration absorber.

[0071] Fig.10 for Figure 1 The structural front view of the transmission shaft dynamic vibration absorber is shown.

[0072] Fig.11 for Fig.10 AA section view shown.

[0073] Fig.12 for Fig.11 BB cross-section shown.

[0074] See above Fig.10 , Fig.11 and Fig.12 It can be seen that in this embodiment, the transmission shaft dynamic vibration absorber designed by the present invention is a bilaterally symmetrical structure, and the process of installing and adjusting the control frequency thereof is as follows: Steps S100-S400:

[0075] S100: Assemble the transmission shaft dynamic vibration absorber. First, install the two end covers 7 at any position on both ends of the main shaft 6, but ensure that the two end covers 7 are at an equal distance from the center of the main shaft 6; then connect the pressing plate 3 and the end covers 7 together through the connecting rod 8 and the pin 9; finally, vulcanize the inner wall of the rubber tube 2 and the tile 17 on the pressing plate 3 together.

[0076] S200: The outer diameter of the rubber tube 2 in the free state is equal to the inner diameter of the transmission shaft 1. The operator rotates the main shaft 6 with a screwdriver, so that the two end covers 7 move relative to each other along the axial direction of the main shaft 6, and drives the pressing plate 3 to move inward along the radial direction of the rubber tube 2, thereby driving the rubber tube 2 to shrink inward, so that the outer diameter of the rubber tube 2 will also shrink; then the assembled transmission shaft dynamic vibration absorber is placed inside the transmission shaft 1.

[0077] S300: Operate the screwdriver again to rotate the main shaft 6 so that the two end covers 7 move in opposite directions to the axial direction of the main shaft 6 , thereby driving the pressing piece 3 to move radially outward along the rubber tube 2 , and the rubber tube 2 will press the main shaft 6 . Fig.13 The figure shows the rotation angle θ and the direction of the radial stiffness K of the transmission shaft dynamic vibration absorber of the present invention. By controlling the rotation angle θ of the main shaft 6 and the pitch l of the external thread, the distance d=θ×l that the end cover 7 moves along the axis of the main shaft 6 can be calculated; Fig.14The angle-radial stiffness curve of the transmission shaft dynamic vibration absorber of the present invention is shown in FIG. 1 . According to the data calibrated in the previous step, the radial stiffness of the transmission shaft dynamic vibration absorber can be adjusted to a desired range; Fig.15 The rotation angle-natural frequency curve of the transmission shaft dynamic vibration absorber of the present invention is shown. The natural frequency of the transmission shaft dynamic vibration absorber will also change accordingly.

[0078] S400: As required, replaceable counterweight rings 5 ​​of appropriate weight are installed in pairs at both ends of the main shaft 6, and two nuts 4 are respectively tightened to both ends of the main shaft 6, which can not only fix the two counterweight rings 5, but also prevent the main shaft 6 from rotating relative to the end cover 7. After adding the replaceable counterweight rings 5 ​​in pairs, the total mass of the counterweight block 10 added to the main shaft 6 and all the counterweight rings 5 ​​constitutes the equivalent mass of the transmission shaft dynamic vibration absorber.

[0079] From the above, it can be seen that in the present invention, the inventor has studied and obtained a new built-in adjustable frequency transmission shaft dynamic vibration absorber, which applies radial pre-compression to the rubber tube by rotating the main shaft to adjust the stiffness of the transmission shaft dynamic vibration absorber, and the mass of the transmission shaft dynamic vibration absorber can be adjusted by changing the mass of the counterweight ring, thereby changing the frequency of the transmission shaft dynamic vibration absorber.

[0080] The built-in adjustable frequency transmission shaft dynamic vibration absorber of the present invention can effectively avoid the defects of traditional solutions, is easy to install and adjust, and can be applied to transmission shafts of different structures. It has a relatively broad application prospect in the field of automobile vibration reduction and noise reduction.

[0081] In addition, the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0082] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with by those skilled in the art from the contents disclosed in the present invention, and all should belong to the protection scope of the present invention.

Claims

1. A built-in adjustable frequency transmission shaft dynamic vibration absorber, which is arranged in the transmission shaft, characterized in that: The transmission shaft dynamic vibration absorber comprises: A rubber tube, wherein a first boss and a second boss are provided on the outer circumferential surface thereof, wherein the top surface of the first boss is higher than the top surface of the second boss, and the top surface of the second boss is an arc-shaped surface along the axial direction of the rubber tube; A main shaft, which is arranged in the rubber tube, and has threaded rods at both ends of the main shaft in the axial direction; The end caps are arranged in pairs and are respectively threadedly connected to the threaded rods through threaded holes at the center; A plurality of pressing sheets are evenly distributed along the inner circumference of the rubber tube, the pressing sheets are vulcanized with the inner surface of the rubber tube, and there is a distance between each pressing sheet; A connecting rod, one end of which is connected to the end cover, and the other end of which is hinged to the pressing sheet; When the main shaft rotates around its own axis, it drives the paired end covers to move relative to or away from each other along the axial direction of the main shaft, thereby driving the pressing plate to move in the radial direction of the rubber tube to adjust the size of the contact area between the top surface of the second boss of the rubber tube and the inner surface of the transmission shaft.

2. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: Along the circumferential direction of the rubber tube, the first boss and the second boss are arranged at intervals.

3. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: The radial cross section of the first boss is rectangular or trapezoidal.

4. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: The radial cross section of the second boss is semicircular.

5. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: The main shaft includes a counterweight block located in the middle, and the threaded rod extends from the axial end of the counterweight block.

6. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: The end of the threaded rod has a groove.

7. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: The pressing sheet includes an arc-shaped tile portion and a rib extending in a radial direction, and the rib is hinged to the connecting rod.

8. The transmission shaft dynamic vibration absorber according to claim 1, characterized in that: The outer circumferential surface of the end cover is provided with a plurality of mounting hole seats extending radially outward, the mounting hole seats are provided with mounting holes, and the end cover is connected to the connecting rod through the mounting holes and pins.

9. The transmission shaft dynamic vibration absorber according to any one of claims 1 to 8, characterized in that: It also includes replaceable counterweight rings arranged in pairs, which are arranged on the main shaft, and each counterweight ring is correspondingly located on the outside of each end cover.

10. The transmission shaft dynamic vibration absorber according to claim 9, characterized in that: It also includes nuts arranged in pairs, which are threadedly connected to the threaded rod, and each nut is correspondingly arranged on the outer side of each counterweight ring.

Images