Screw vibration reduction drive shaft assembly

Abstract

The present invention provides a screw vibration-damping transmission shaft assembly, comprising a housing structure, wherein a transmission main shaft and a drill bit shaft are disposed within the housing structure, with the first end of the drill bit shaft being slidably inserted into the first end of the transmission main shaft; a guide rail sleeve disposed between the drill bit shaft and the housing structure, wherein the first end of the guide rail sleeve is fixedly connected to the first end of the transmission main shaft, an axial elastic unit is disposed between the drill bit shaft and the guide rail sleeve, and a vibration-damping connection structure is disposed between the drill bit shaft and the guide rail sleeve, wherein the vibration-damping connection structure includes a raised guide rail unit disposed on the outer wall of the drill bit shaft and a recessed guide groove unit disposed on the inner wall of the guide rail sleeve, wherein the raised guide rail unit can spirally rise or fall along the recessed guide groove unit; and a suspension block capable of axially limiting the drill bit shaft is connected to the outer wall of the drill bit shaft. The present invention disposes a vibration-damping system within a conventional transmission shaft, capable of simultaneously absorbing axial and radial impact loads, improving the working condition of the screw drill bearing, and increasing the service life of the screw drill.

Description

Technical Field

[0001] The present invention relates to a downhole drilling tool in the field of petroleum development, and in particular to a screw vibration-damping transmission shaft assembly. Background Art

[0002] With the advancement of drilling technology, the use of screw drill tools has increased. These tools utilize the kinetic energy of the drilling fluid to generate rotary cutting torque, driving the drill bit to achieve rock breaking. Screw drill tools are positive displacement downhole power drilling tools that use drilling fluid as a power source, converting the fluid's pressure energy into mechanical energy. When mud pumped from the mud pump flows through a bypass valve and into the motor, a pressure differential is created between the motor's inlet and outlet, driving the rotor to rotate about the stator's axis. The speed and torque are then transmitted to the drill bit via the universal joint and drive shaft, enabling drilling operations.

[0003] A screw drill assembly primarily consists of a bypass valve assembly, a motor assembly, a universal joint assembly, and a drive shaft assembly. The drive shaft assembly transmits the torque generated by the upper motor to the drill bit, requiring it to withstand both axial and radial loads. Furthermore, the lower end of the drive shaft assembly is typically directly connected to the drill bit, meaning the vibrations generated by the drill bit cutting rock are directly applied to the drive shaft assembly, resulting in a harsh operating environment. Conventional drive shaft assemblies are equipped with multiple thrust bearings, including ball bearings and PDC bearings. Ball bearings are relatively inexpensive, making them widely used. For example, ball bearings must withstand the pressure on bit (WOB), transmitting this pressure to the drill bit via the ball in the middle of the bearing. Furthermore, the drive shaft assembly's housing and the drive shaft within it must rotate relative to each other. The bearing section of a typical drive shaft assembly is an open structure, allowing drilling fluid containing a certain amount of solid particles to flow into the bearing. The operating environment of the ball bearing makes it a vulnerable link in the drive shaft assembly. Excessive bearing wear requires replacement in screw drills. In the actual use of screw drilling tools, it is generally determined whether the screw needs maintenance by measuring the bearing wear.

[0004] Another common failure mode for drive shaft bearings is the breakage of the bearing balls. Once this occurs, bearing wear is exacerbated, leading to complete failure of the drive shaft in a very short time. Ball breakage in ball bearings is a significant factor limiting the service life of screw drills, so it is important to avoid this issue during use.

[0005] The primary cause of ball breakage in bearings is severe vibration, resulting from the intense impact loads on the balls, which create a sudden, peak impact that causes them to break. This intense vibration primarily stems from the load fluctuations generated by the drill bit breaking the rock. Due to the uncertainty of the downhole environment, this vibration is unavoidable and difficult to predict, making it difficult to actively mitigate. When severe vibrations occur at the drill bit, they are ultimately transmitted to the bearing balls. Since conventional screw drills lack any vibration-damping mechanisms, these shock loads pose a significant threat to the service life of the screw drill.

[0006] In order to further improve the service life of screw drill tools, it is necessary to design a new transmission shaft structure to absorb the vibration impact load near the drill bit.

[0007] Therefore, the inventor, relying on years of experience and practice in related industries, proposes a screw vibration reduction transmission shaft assembly to overcome the defects of the prior art. Summary of the Invention

[0008] The purpose of the present invention is to provide a screw vibration-damping drive shaft assembly to overcome technical problems in the prior art such as the inability of screw drill drive shafts to withstand vibration and impact. The screw vibration-damping drive shaft assembly sets the vibration reduction system inside the conventional drive shaft, which can absorb axial and radial impact loads at the same time, improve the working condition of the screw drill bearings, and increase the service life of the screw drill.

[0009] The object of the present invention is achieved by providing a screw vibration damping transmission shaft assembly, comprising a housing structure, wherein a transmission main shaft and a drill shaft connected in sequence are inserted into the housing structure, a first end of the drill shaft is slidably inserted into the first end of the transmission main shaft, and a central flow channel is provided axially through the transmission main shaft and the drill shaft;

[0010] A guide rail sleeve is provided between the drill shaft and the housing structure, the first end of the guide rail sleeve is fixedly connected to the first end of the transmission main shaft, and an axial elastic unit is provided between the drill shaft and the guide rail sleeve, and a vibration-damping connection structure is provided between the drill shaft and the guide rail sleeve, the vibration-damping connection structure includes a raised guide rail unit provided on the outer wall of the drill shaft and a groove guide groove unit provided on the inner wall of the guide rail sleeve, the raised guide rail unit can spirally rise or fall along the groove guide groove unit; a suspension block capable of axially limiting the drill shaft is connected to the outer wall of the drill shaft and located below the vibration-damping connection structure.

[0011] In a preferred embodiment of the present invention, the housing structure includes a transmission shaft housing, a middle TC bearing stationary ring and a lower TC bearing stationary ring connected in sequence; the transmission main shaft is passed through the transmission shaft housing, the drill shaft is passed through the middle TC bearing stationary ring and the lower TC bearing stationary ring, a middle TC bearing moving ring is arranged between the middle TC bearing stationary ring and the transmission main shaft, and a lower stationary cylinder and a lower TC bearing moving ring are arranged between the lower TC bearing stationary ring and the drill shaft.

[0012] In a preferred embodiment of the present invention, the protruding guide rail unit is a multi-start external thread structure, the recessed guide groove unit is a multi-start internal thread structure, and a gap is provided between the protruding guide rail unit and the recessed guide groove unit.

[0013] In a preferred embodiment of the present invention, the cross sections of the raised guide rail unit and the groove guide groove unit are trapezoidal.

[0014] In a preferred embodiment of the present invention, the axial elastic unit is a disc spring.

[0015] In a preferred embodiment of the present invention, the suspension blocks are two half-moon rings; a connecting groove is provided on the side wall of the drill shaft, and each of the suspension blocks is connected to the connecting groove in an interference fit, and each of the suspension blocks is clearance fit with the static ring of the middle TC bearing.

[0016] In a preferred embodiment of the present invention, the transmission shaft housing is connected to the middle TC bearing static ring by threads, and the middle TC bearing static ring is connected to the lower TC bearing static ring by threads; the middle TC bearing dynamic ring is connected to the transmission main shaft by interference fit, and the middle TC bearing dynamic ring and the middle TC bearing static ring are arranged with a clearance fit.

[0017] In a preferred embodiment of the present invention, a centering bearing sleeve assembly is provided at the second end of the transmission main shaft, and the centering bearing sleeve assembly includes an upper TC bearing moving ring, an upper moving cylinder, an upper static cylinder and an upper TC bearing static ring arranged from the inside to the outside, and the centering bearing sleeve assembly is axially fixed to the transmission main shaft through a sleeve; the upper TC bearing moving ring is connected to the transmission main shaft through a threaded connection, the upper moving cylinder is connected to the upper TC bearing moving ring through an interference fit, and the upper TC bearing static ring is connected to the transmission shaft housing through an interference fit.

[0018] In a preferred embodiment of the present invention, an upper static ring sleeve is arranged between the upper TC bearing static ring and the transmission shaft housing; a bearing inner ring, balls and a bearing outer ring are arranged between the transmission main shaft and the transmission shaft housing, and a spacer sleeve is arranged between the bearing outer ring and the middle TC bearing static ring.

[0019] In a preferred embodiment of the present invention, the lower TC bearing movable ring is connected to the drill shaft through a thread, the lower static cylinder is connected to the lower TC bearing static ring through an interference fit, and the lower static cylinder and the lower TC bearing movable ring are arranged with a clearance fit.

[0020] As described above, the screw vibration damping transmission shaft assembly of the present invention has the following beneficial effects:

[0021] The screw vibration-damping drive shaft assembly of the present invention overcomes technical problems in the prior art such as the inability of the screw drill drive shaft to withstand vibration and impact. The screw vibration-damping drive shaft assembly arranges the vibration reduction system inside the conventional drive shaft assembly, which can absorb axial and radial impact loads at the same time, improve the working condition of the screw drill bearing, and increase the service life of the screw drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0023] in:

[0024] Figure 1 : This is an appearance diagram of the screw vibration damping transmission shaft assembly of the present invention.

[0025] Figure 2 :for Figure 1 Middle BB cross-section view.

[0026] Figure 3 :for Figure 2 Middle AA section view.

[0027] Figure 4 : is a schematic diagram of the drill shaft of the present invention.

[0028] In the picture:

[0029] 1. Drive main shaft; 2. Bushing; 3. Upper TC bearing moving ring; 4. Upper moving cylinder; 5. Upper TC bearing stationary ring; 6. Upper stationary cylinder; 7. Drive shaft housing; 8. Upper stationary ring sleeve; 9. Bearing inner ring; 10. Bearing outer ring; 11. Ball; 12. Spacer; 13. Middle TC bearing moving ring; 14. Middle TC bearing stationary ring; 15. Guide rail sleeve; 151. Groove guide unit; 16. Drill shaft; 161. Raised guide rail unit; 17. Disc spring; 18. Suspension block; 19. Lower TC bearing stationary ring; 20. Lower stationary cylinder; 21. Lower TC bearing moving ring. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0031] The specific embodiments of the present invention described herein are intended only to illustrate the present invention and are not to be construed as limiting the present invention in any way. In light of the present invention, a skilled person may conceive of any possible variations based on the present invention, all of which should be considered to fall within the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to mechanical or electrical connections, or to internal communication between two elements, and may be directly connected or indirectly connected through an intermediate medium. A person of ordinary skill in the art can understand the specific meanings of the above terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the present invention provides a screw vibration reduction transmission shaft assembly, including a housing structure, wherein a transmission main shaft 1 and a drill shaft 16 are sequentially connected and passed through the housing structure, wherein the first end of the drill shaft 16 is slidably inserted into the first end of the transmission main shaft 1, and a central flow channel is axially penetrated on the transmission main shaft 1 and the drill shaft 16;

[0034] A guide rail sleeve 15 is arranged between the drill shaft 16 and the shell structure. The first end of the guide rail sleeve 15 is fixedly connected (threadedly connected) to the first end of the transmission main shaft 1, and an axial elastic unit is arranged between the drill shaft 16 and the guide rail sleeve 15. A vibration-damping connection structure is arranged between the drill shaft 16 and the guide rail sleeve 15. The vibration-damping connection structure includes a raised guide rail unit 161 arranged on the outer wall of the drill shaft 16 and a groove guide groove unit 151 arranged on the inner wall of the guide rail sleeve 15. The raised guide rail unit 161 can spirally rise or fall along the groove guide groove unit 151; a suspension block 18 that can axially limit the drill shaft is connected to the outer wall of the drill shaft 16 below the vibration-damping connection structure.

[0035] The screw vibration reduction transmission shaft assembly of the present invention is in the initial state of use, with the drill shaft 16 at the bottom ( Figure 2 The lower end) position in the middle, the hanging block 18 ensures that the drill shaft 16 will not fall off from the shell structure, the first end of the drill shaft 16 is at the lowest position of the transmission main shaft 1, and the drill shaft 16 can move a certain distance in the axial direction; when in use, the drill bit is connected to the lower end of the drill shaft 16, and under the cooperation connection of the raised guide rail unit 161 and the groove guide groove unit 151, the rotational torque of the transmission main shaft 1 is transmitted to the drill bit through the guide rail sleeve 15 and the drill shaft 16, driving it to drill; when the drill bit encounters a harder object, the drill shaft 16 is subjected to an upward axial force, and under the cooperation of the raised guide rail unit 161 and the groove guide groove unit 151, the drill shaft 16 spirally rises and slides in the guide rail sleeve 15, while absorbing axial and radial impact loads; at the same time, the axial elastic unit gradually enters a compressed state, stores energy, and further absorbs the axial impact load, thereby achieving the purpose of axial vibration reduction.

[0036] The screw vibration-damping drive shaft assembly of the present invention overcomes technical problems in the prior art such as the inability of the screw drill drive shaft to withstand vibration and impact. The screw vibration-damping drive shaft assembly arranges the vibration reduction system inside the conventional drive shaft assembly, which can absorb axial and radial impact loads at the same time, improve the working condition of the screw drill bearing, and increase the service life of the screw drill.

[0037] Further, if Figure 1 、 Figure 2 As shown, the housing structure includes a transmission shaft housing 7, a middle TC bearing stationary ring 14 and a lower TC bearing stationary ring 19 connected in sequence; the transmission shaft housing 7 is provided with a transmission main shaft 1 (the transmission main shaft 1 can use a traditional screw transmission shaft), and the middle TC bearing stationary ring 14 and the lower TC bearing stationary ring 19 are provided with a drill shaft 16; the middle TC bearing moving ring 13 is provided between the middle TC bearing stationary ring 14 and the transmission main shaft 1, and the lower stationary cylinder 20 and the lower TC bearing moving ring 21 are provided between the lower TC bearing stationary ring 19 and the drill shaft 16; the second end of the drill shaft 16 is constrained from circumferential shaking by the lower TC bearing moving ring 21 and the lower TC bearing stationary ring 19 to ensure the output positioning accuracy.

[0038] Screw drill tools are one of the most widely used downhole power tools in oil drilling. The TC bearing, located in the transmission section, is a critical component affecting the life of the screw drill tool. The TC bearing consists of an inner and outer bearing sleeve (static ring and dynamic ring). The inner sleeve fits and locks onto the drive shaft, while the outer sleeve is assembled with the downhole power drill housing. Together, they form a working surface, primarily transmitting the motor's torque and speed to the drill bit. During operation, the TC bearing is subjected to axial and radial forces from the universal joint and drill bit, causing the inner sleeve to move eccentrically around the outer sleeve.

[0039] Further, if Figure 2 、 Figure 3、 Figure 4 As shown, the raised guide rail unit 161 is a multi-start external thread structure, and the groove guide groove unit 151 is a multi-start internal thread structure. The multi-start external thread structure and the multi-start internal thread structure are spirally connected, and a gap is set between the raised guide rail unit 161 and the groove guide groove unit 151.

[0040] To facilitate assembly and matching, the cross-sections of the raised guide rail unit 161 and the recessed guide groove unit 151 are arranged to be trapezoidal.

[0041] Further, if Figure 2 As shown, the axial elastic unit is a disc spring 17. Disc spring 17 is initially compressed. When the drill shaft 16 is subjected to the upward axial force of the drill bit, disc spring 17 compresses and acts as a buffer. The lower end of the drill shaft 16 needs to be connected to the drill bit. When the drill bit encounters a hard object, the drill shaft 16 will slide in the trapezoidal groove guide groove unit 151 in the guide rail sleeve 15 via the raised guide rail unit 161, further compressing the disc spring 17 and storing energy.

[0042] Further, if Figure 2 As shown, there are two suspension blocks 18 in the form of half-moon rings. Connecting grooves are provided on the sidewalls of the drill shaft 16, with each suspension block 18 forming an interference fit with the connecting grooves. Each suspension block 18 forms a clearance fit with the stationary ring 14 of the middle TC bearing. The suspension blocks 18 limit the vertical movement of the drill shaft 16 and prevent it from falling.

[0043] Further, if Figure 2 As shown, the transmission shaft housing 7 is connected to the middle TC bearing static ring 14 through threads, and the middle TC bearing static ring 14 is connected to the lower TC bearing static ring 19 through threads; the middle TC bearing dynamic ring 13 is connected to the transmission main shaft 1 through an interference fit, and the middle TC bearing dynamic ring 13 and the middle TC bearing static ring 14 are set with a clearance fit.

[0044] Further, if Figure 2 As shown, the second end of the transmission main shaft 1 is provided with a centering bearing sleeve assembly, which includes an upper TC bearing moving ring 3, an upper moving cylinder 4, an upper static cylinder 6 and an upper TC bearing static ring 5 arranged from the inside to the outside. The centering bearing sleeve assembly is axially fixed to the transmission main shaft 1 through the sleeve 2. The second end of the transmission main shaft 1 ( Figure 1 The upper end of the centering bearing assembly is used to restrain its circumferential shaking.

[0045] Further, if Figure 2 As shown, an upper static ring sleeve 8 is arranged between the upper TC bearing static ring 5 and the transmission shaft housing 7; a bearing inner ring 9, balls 11 and a bearing outer ring 10 are arranged between the transmission main shaft 1 and the transmission shaft housing 7, and a spacer sleeve 12 is arranged between the bearing outer ring 10 and the middle TC bearing static ring 14.

[0046] Further, if Figure 2As shown, the upper TC bearing moving ring 3 is connected to the transmission main shaft 1 through threads, the upper moving cylinder 4 is connected to the upper TC bearing moving ring 3 through interference fit, and the upper TC bearing static ring 5 is connected to the transmission shaft housing 7 through interference fit.

[0047] Further, if Figure 2 As shown, the lower TC bearing moving ring 21 is connected to the drill shaft 16 through threads, the lower static cylinder 20 is connected to the lower TC bearing static ring 19 through interference fit, and the lower static cylinder 20 and the lower TC bearing moving ring 21 are arranged with a clearance fit.

[0048] Working principle of the present invention:

[0049] like Figure 1 As shown, the lower end of the screw vibration reduction transmission shaft assembly of the present invention is connected to the drill bit, and the upper end is connected to the motor (existing technology) that provides power. The power is transmitted to the transmission main shaft 1 through the threaded structure. The first end of the transmission main shaft 1 ( Figure 1 The middle and lower end) is connected to the guide rail sleeve 15 through a thread, transmitting power to the guide rail sleeve 15, and the guide rail sleeve 15 and the drill shaft 16 are connected through the cooperation of the trapezoidal raised guide rail unit 161 and the groove guide groove unit 151. The power is transmitted from the guide rail sleeve 15 to the drill shaft 16, and finally the drill shaft 16 and the transmission main shaft 1 rotate synchronously. And because there is a distance between the drill shaft 16 and the transmission main shaft 1 axially, the drill shaft 16 can rotate in the circumferential direction and maintain axial movement through the cooperation of the raised guide rail unit 161 and the groove guide groove unit 151. The second end of the transmission main shaft 1 ( Figure 1 A centering bearing (at the middle and upper end) constrains its circumferential movement. When the drill bit connected to drill shaft 16 contacts a hard object, an upward force is applied to drill shaft 16 to protect the drill bit and maintain the mechanical rotational speed. Due to the cooperation between the raised guide rail unit 161 and the recessed guide groove unit 151, sufficient axial distance remains between the transmission spindle 1 and drill shaft 16. Furthermore, the presence of the disc spring allows drill shaft 16 to move up and down within the stationary ring 14 of the middle TC bearing, thus distributing the pressure from the balls 11 in the rolling bearing on the transmission spindle 1.

[0050] As described above, the screw vibration damping transmission shaft assembly of the present invention has the following beneficial effects:

[0051] The screw vibration-damping drive shaft assembly of the present invention overcomes technical problems in the prior art such as the inability of the screw drill drive shaft to withstand vibration and impact. The screw vibration-damping drive shaft assembly arranges the vibration reduction system inside the conventional drive shaft assembly, which can absorb axial and radial impact loads at the same time, improve the working condition of the screw drill bearing, and increase the service life of the screw drill.

[0052] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A screw vibration damping transmission shaft assembly, characterized in that: The invention comprises a housing structure, wherein a transmission main shaft and a drill shaft connected in sequence are passed through the housing structure, a first end of the drill shaft is slidably inserted into the first end of the transmission main shaft, and a central flow channel is axially penetrated on the transmission main shaft and the drill shaft; A guide rail sleeve is provided between the drill shaft and the housing structure, a first end of the guide rail sleeve is fixedly connected to the first end of the transmission main shaft, and an axial elastic unit is provided between the drill shaft and the guide rail sleeve, a vibration-damping connection structure is provided between the drill shaft and the guide rail sleeve, the vibration-damping connection structure includes a protruding guide rail unit provided on the outer wall of the drill shaft and a groove guide groove unit provided on the inner wall of the guide rail sleeve, the protruding guide rail unit can spirally rise or fall along the groove guide groove unit; a suspension block capable of axially limiting the drill shaft is connected to the outer wall of the drill shaft and located below the vibration-damping connection structure; The housing structure includes a transmission shaft housing, a middle TC bearing stationary ring, and a lower TC bearing stationary ring connected in sequence; the transmission main shaft is passed through the transmission shaft housing, the drill bit shaft is passed through the middle TC bearing stationary ring and the lower TC bearing stationary ring, a middle TC bearing moving ring is provided between the middle TC bearing stationary ring and the transmission main shaft, and a lower stationary cylinder and a lower TC bearing moving ring are provided between the lower TC bearing stationary ring and the drill bit shaft; A centering bearing sleeve assembly is provided at the second end of the transmission main shaft. The centering bearing sleeve assembly includes an upper TC bearing moving ring, an upper moving cylinder, an upper static cylinder and an upper TC bearing static ring, which are arranged from the inside to the outside. The centering bearing sleeve assembly is axially fixed to the transmission main shaft through a sleeve; the upper TC bearing moving ring is connected to the transmission main shaft through a threaded connection, the upper moving cylinder is connected to the upper TC bearing moving ring through an interference fit, and the upper TC bearing static ring is connected to the transmission shaft housing through an interference fit; The lower TC bearing moving ring is connected to the drill shaft through threads, the lower static cylinder is connected to the lower TC bearing static ring through interference fit, and the lower static cylinder and the lower TC bearing moving ring are arranged in a clearance fit.

2. The screw vibration damping transmission shaft assembly according to claim 1, characterized in that: The protruding guide rail unit is a multi-start external thread structure, the recessed guide groove unit is a multi-start internal thread structure, and a gap is provided between the protruding guide rail unit and the recessed guide groove unit.

3. The screw vibration damping transmission shaft assembly according to claim 2, characterized in that: The cross sections of the protrusion guide rail unit and the groove guide groove unit are arranged in a trapezoidal shape.

4. The screw vibration damping transmission shaft assembly according to claim 1, characterized in that: The axial elastic unit is a disc spring.

5. The screw vibration damping transmission shaft assembly according to claim 1, characterized in that: The suspension blocks are two half-moon rings; a connecting groove is provided on the side wall of the drill shaft, and each suspension block is connected to the connecting groove in an interference fit, and each suspension block is clearance fit with the static ring of the middle TC bearing.

6. The screw vibration damping transmission shaft assembly according to claim 1, characterized in that: The transmission shaft housing is connected to the middle TC bearing static ring through threads, and the middle TC bearing static ring is connected to the lower TC bearing static ring through threads; the middle TC bearing dynamic ring is connected to the transmission main shaft through interference fit, and the middle TC bearing dynamic ring and the middle TC bearing static ring are arranged with clearance fit.

7. The screw vibration damping transmission shaft assembly according to claim 1, characterized in that: An upper static ring sleeve is arranged between the upper TC bearing static ring and the transmission shaft housing; a bearing inner ring, balls and a bearing outer ring are arranged between the transmission main shaft and the transmission shaft housing, and a spacer sleeve is arranged between the bearing outer ring and the middle TC bearing static ring.

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