Rotating shaft assembly structure

Abstract

The present application relates to a rotating shaft assembly structure, which comprises a body provided with a first accommodating groove and a first accommodating slot; a rotating shaft provided with a fourth peripheral surface, a first screwing part, a third abutting edge, a fifth peripheral surface, a second screwing part and a fourth abutting edge; a first bearing set provided with a plurality of first bearings and a first precision nut; the plurality of first bearings are sleeved on the fourth peripheral surface; the first precision nut is screwed and locked with the first screwing part, so that the plurality of first bearings are arranged on the fourth peripheral surface; a second bearing set is arranged with the body and the rotating shaft, and the second bearing set is provided with a plurality of second bearings; the plurality of second bearings are sleeved on the fifth peripheral surface; a rear lock set is arranged with the body and the rotating shaft, and the rear lock set is arranged with the second bearing set.

Description

Technical Field

[0001] This invention relates to a rotating shaft assembly structure, particularly a rotating shaft assembly structure in which a first precision nut assembles multiple first bearings on the rotating shaft. When the rotating shaft and the first bearing assembly are assembled on the body, slippage between the first bearings and the rotating shaft can be avoided, and the first bearings and the body can be fitted together more smoothly. Background Technology

[0002] As previously known, this is a common rotating shaft assembly structure, which is also the subject of the applicant's patent application, Taiwan Patent Application No.: 107123297, Certificate No.: I647035, Patent Title: Main Shaft Structure. The structure of this patent application consists of: a body 10, which is mounted on a machine tool and has a first receiving groove 11, which is perforated; and a rotating shaft 20, which is pivotally mounted on the first receiving groove 11, with one end of the rotating shaft 20... The rotating shaft 20 is provided with a second receiving groove 21, a first circumferential surface 22, and a first abutment 23; a first cover 30 is fixed to the end of the main body 10, the first cover 30 is provided with a third receiving groove 31, the third receiving groove 31 is pivotally provided for one end of the rotating shaft 20, and a second abutment 32 is sequentially provided around the outer circumferential surface of the third receiving groove 31; a sealing member 50 is provided with a second circumferential surface 51, the second circumferential surface 51 and the first circumferential surface of the rotating shaft 20 are connected. The sealing member 50 is fitted onto the rotating shaft 20 and rotates rapidly with the rotating shaft 20. The sealing member 50 has a first abutment surface 52, which is aligned with the first abutment edge 23 and the second abutment edge 32, or the first abutment surface 52 abuts against the first abutment edge 23 of the rotating shaft 20 and the second abutment edge 32 of the first cover 30. The sealing member 50 has a first end face 57 at its end face; at least one second cover 70 is fixed. Located at the end of the rotating shaft 20, the sealing member 50 and the second cover 70 are attached to the rotating shaft 20 and rotate rapidly with the rotating shaft 20. The second cover 70 is provided with a fourth abutment surface 71, which is aligned with the first end face 57 of the sealing member 50. That is, the sealing member 50 is assembled between the first abutment edge 23 and the fourth abutment surface 71 of the rotating shaft 20, so that the sealing member 50 is restricted by the second cover 70 and cannot be detached from the rotating shaft 20.

[0003] However, the drawback of this common rotating shaft assembly structure is that:

[0004] Please refer to Figure 8 of the Taiwan Gazette. The rotating shaft 20 is pivotally mounted inside the body 10 and rotates rapidly. Structurally, multiple bearings are required between the rotating shaft 20 and the body 10. However, during assembly, the bearings are prone to slippage and uncertainty. That is, during assembly, the rotating shaft 20 and the bearing will slip relative to each other, and the body 10 and the bearing will also slip relative to each other. Each pair of the three will slip relative to each other, so there are two variables of slippage. After assembly, the position of the bearing may be uncertain.

[0005] In view of the shortcomings of the above-mentioned common structures, the inventor, with many years of experience in manufacturing, production and design in related industries, has finally developed a product with a rotating shaft assembly structure that can solve common drawbacks. Summary of the Invention

[0006] The main objective of this invention is that, in the rotating shaft assembly structure of this invention, the first precision nut assembles the plurality of first bearings on the rotating shaft. When the rotating shaft and the first bearing assembly are mounted on the body, slippage between the first bearings and the rotating shaft can be avoided, and the first bearings and the body can be fitted together more smoothly.

[0007] To achieve the above objectives, the present invention provides a rotating shaft assembly structure, characterized in that it comprises:

[0008] A main body, the main body having a first receiving groove that penetrates the main body, the main body having a first receiving slot that communicates with the first receiving groove;

[0009] A rotating shaft is pivotally mounted within a first accommodating groove. The rotating shaft has a fourth circumferential surface and a first threaded portion. The first threaded portion is externally threaded and its maximum diameter is smaller than the outer diameter of the fourth circumferential surface, such that a third abutment is provided between the first threaded portion and the fourth circumferential surface. The rotating shaft also has a fifth circumferential surface that is far from the fourth circumferential surface. One end of the rotating shaft has a second threaded portion that is externally threaded. The rotating shaft also has a fourth abutment, and the fifth circumferential surface is located between the fourth abutment and the second threaded portion.

[0010] A first bearing assembly is assembled with the body and the rotating shaft. The first bearing assembly is disposed between the body and the rotating shaft. The first bearing assembly includes a plurality of first bearings, a first precision nut and a first washer.

[0011] The plurality of first bearings are sleeved on the fourth circumferential surface, the plurality of first bearings are disposed between the first receiving groove and the fourth circumferential surface, and one end of the plurality of first bearings abuts against one end face of the rotating shaft;

[0012] The first precision nut is screwed and locked to the first threaded part, so that the plurality of first bearing assemblies are disposed on the fourth circumferential surface and cannot be displaced. The first precision nut rotates with the rotating shaft, and the first precision nut may or may not abut against the third abutment.

[0013] The first washer fits onto the fourth circumferential surface, and the first washer is disposed between the plurality of first bearings and the first precision nut. The first washer rotates with the rotating shaft.

[0014] A second bearing assembly is provided, which is assembled with the body and the rotating shaft. The second bearing assembly is located between the body and the rotating shaft. The second bearing assembly and the first bearing assembly are located at opposite ends of the rotating shaft. There is a gap between the second bearing assembly and the first bearing assembly.

[0015] A rear locking assembly is configured with the main body and the rotating shaft, and the rear locking assembly is configured with the second bearing assembly.

[0016] The main advantages of this invention are: the first precision nut assembles the plurality of first bearings onto the rotating shaft, preventing slippage between the first bearings and the rotating shaft when the rotating shaft and the first bearing assembly are mounted on the body, thus facilitating smoother fitting between the first bearings and the body. The second bearing assembly is then secured to a predetermined position by the rear locking assembly, preventing slippage between the second bearing assembly and the rotating shaft, resulting in a superior assembly structure. The first bearing is positioned by the first precision nut, and the second bearing is positioned by the rear locking assembly; both the first precision nut and the rear locking assembly have their respective assembly functions, resulting in a superior assembly structure. Attached Figure Description

[0017] Figure 1 This is an exploded perspective view of the rotating shaft assembly structure of the present invention.

[0018] Figure 2 This is a side view of the rotating shaft assembly structure body of the present invention.

[0019] Figure 3 This is the present invention. Figure 2 A cross-sectional view at point AA.

[0020] Figure 4 This is an exploded perspective view of the first bearing assembly of the rotating shaft assembly structure of the present invention.

[0021] Figure 5 This is an exploded perspective view of the second bearing assembly of the rotating shaft assembly structure of the present invention.

[0022] Figure 6 This is a three-dimensional exploded view of the rear locking assembly of the rotating shaft assembly structure of the present invention.

[0023] Figure 7This is a perspective view of the rotating shaft assembly structure of the present invention.

[0024] Figure 8 This is a side view of the first operating state of the rotating shaft assembly structure of the present invention.

[0025] Figure 9 This is the present invention. Figure 8 A cross-sectional view at point BB.

[0026] Figure 10 This is a cross-sectional view of the second operating state of the rotating shaft assembly structure of the present invention.

[0027] Figure 11 This is a cross-sectional view of the third operating state of the rotating shaft assembly structure of the present invention.

[0028] Figure 12 This is the present invention. Figure 11 A magnified view of point D.

[0029] Figure 13 This is a cross-sectional view of the second embodiment of the present invention.

[0030] Figure 14 This is a cross-sectional view of the third embodiment of the present invention. Detailed Implementation

[0031] Please refer to the following first. Figures 1 to 6 and Figure 12 As shown, Figure 1 This is an exploded perspective view of the rotating shaft assembly structure of the present invention. Figure 2 This is a side view of the main body 10 of the rotating shaft assembly structure of the present invention. Figure 3 This is the present invention. Figure 2 Sectional view at AA, Figure 4 This is an exploded perspective view of the first bearing assembly 30 of the rotating shaft assembly structure of the present invention. Figure 5 This is an exploded perspective view of the second bearing assembly 40 of the rotating shaft assembly structure of the present invention. Figure 6 This is an exploded perspective view of the rear locking assembly 50 of the rotating shaft assembly structure of the present invention. Figure 12 This is the present invention. Figure 11 The enlarged view at point D shows that this invention relates to a rotating shaft assembly structure, comprising:

[0032] One main body 10, please supplement with Figure 3As shown, the body 10 is mounted on various machine tools or machining centers. The body 10 has a first receiving groove 11 that penetrates the body 10. The first receiving groove 11 is circular and contains a first circumferential surface 111, a second circumferential surface 112, and a third circumferential surface 113. The first circumferential surface 111 is located at an opening at one end of the first receiving groove 11, and the third circumferential surface 113 is located between the first circumferential surface 111 and the second circumferential surface 112. The diameter of the first circumferential surface 111 is smaller than the diameter of the third circumferential surface 113, resulting in a first flange 114 within the first receiving groove 11. The first flange 114 is planar, and the diameter of the third circumferential surface 113 is larger than the diameter of the second circumferential surface 112. The diameter of the first receiving groove 11 is such that a second abutment 115 is provided inside the first receiving groove 11. The second abutment 115 is planar. The body 10 is provided with a first receiving groove 116. The first receiving groove 116 is in communication with the first receiving groove 11. The first receiving groove 116 is circular. The first receiving groove 116 is located near the second circumferential surface 112. The diameter of the first receiving groove 116 is larger than the diameter of the second circumferential surface 112. The first receiving groove 116 has a maximum diameter. The first receiving groove 116 is provided with a plurality of first screw holes 117. The plurality of first screw holes 117 are arranged in a spaced ring around the axis of the first receiving groove 116. The number of the plurality of first screw holes 117 is 6. The first screw holes 117 are perforated.

[0033] A rotating shaft 20 is pivotally mounted within the first receiving groove 11. The rotating shaft 20 rotates rapidly relative to the body 10. One end of the rotating shaft 20 is used for assembling various cutting tools, and both ends protrude from the body 10. The rotating shaft 20 has a fourth circumferential surface 21, which is aligned with the first circumferential surface 111. The rotating shaft 20 has a first threaded portion 22, which is externally threaded. The maximum diameter of the first threaded portion 22 is smaller than the outer diameter of the fourth circumferential surface 21, resulting in a third abutment 23 between the first threaded portion 22 and the fourth circumferential surface 21. The third abutment 23 is planar. The rotating shaft 20 also has a fifth circumferential surface 24, which is far from the fourth circumferential surface 21. The first threaded portion 22, the second threaded portion 25, and the second threaded portion 25 are respectively aligned with the second circumferential surface 112. The second threaded portion 25 is externally threaded. The second circumferential surface 24 is located between the fourth threaded portion 26 and the second threaded portion 25. The fourth threaded portion 26 is planar. The second circumferential surface 27 is respectively aligned with the third circumferential surface 113. The second circumferential surface 24, the third threaded portion 23, the first threaded portion 22, the sixth circumferential surface 27, the fourth threaded portion 26, the fifth circumferential surface 24 and the second threaded portion 25 are arranged sequentially. The diameter of the fourth circumferential surface 21 is larger than the diameter of the sixth circumferential surface 27, and the diameter of the sixth circumferential surface 27 is larger than the diameter of the fifth circumferential surface 24.

[0034] First bearing assembly 30, please supplement with Figure 4 As shown, the first bearing assembly 30 is assembled with the body 10 and the rotating shaft 20. The first bearing assembly 30 is located between the body 10 and the rotating shaft 20. The first bearing assembly 30 is provided with a plurality of first bearings 31, a first precision nut 32 and a first washer 33.

[0035] The plurality of first bearings 31 are sleeved on the fourth circumferential surface 21. The plurality of first bearings 31 are located between the first circumferential surface 111 and the fourth circumferential surface 21. One end of the plurality of first bearings 31 abuts against one end face of the rotating shaft 20, and the other end of the plurality of first bearings 31 abuts against the first flange 114, so that the plurality of first bearings 31 cannot be displaced on the first circumferential surface 111. The number of the plurality of first bearings 31 is 3.

[0036] The first precision nut 32 is screwed and locked with the first threaded part 22, so that the plurality of first bearings 31 are assembled on the fourth circumferential surface 21 and cannot be displaced. The first precision nut 32 rotates with the rotating shaft 20, and the first precision nut 32 may or may not abut against the third abutment 23.

[0037] The first washer 33 is fitted onto the fourth circumferential surface 21. The first washer 33 is disposed between the plurality of first bearings 31 and the first precision nut 32. The first washer 33 rotates with the rotating shaft 20.

[0038] The first precision nut 32 presses against the inner rings of the first washer 33 and the plurality of first bearings 31, causing the first washer 33, the first precision nut 32, and the inner rings of the plurality of first bearings 31 to rotate with the rotating shaft 20, so that the inner rings of the plurality of first bearings 31 and the rotating shaft 20 are in a tight fit.

[0039] First bearing assembly 40, please supplement with Figure 5 As shown, the second bearing assembly 40 is assembled with the body 10 and the rotating shaft 20. The second bearing assembly 40 is located between the body 10 and the rotating shaft 20. The second bearing assembly 40 and the first bearing assembly 30 are located at opposite ends of the rotating shaft 20. There is a gap between the second bearing assembly 40 and the first bearing assembly 30. The second bearing assembly 40 is provided with a plurality of second bearings 41 and a second washer 42.

[0040] The plurality of second bearings 41 are sleeved on the fifth circumferential surface 24, and the plurality of second bearings 41 are disposed between the second circumferential surface 112 and the fifth circumferential surface 24. The number of the plurality of second bearings 41 is 2.

[0041] The second washer 42 is sleeved on the fifth circumferential surface 24. The second washer 42 abuts between the fourth abutment 26 and the inner ring of the plurality of second bearings 41. The second washer 42 rotates with the rotating shaft 20.

[0042] One rear lock group 50, please assist with Figure 6 As shown, the rear locking assembly 50 is assembled with the body 10 and the rotating shaft 20. The rear locking assembly 50 is assembled with the second bearing assembly 40. The rear locking assembly 50 is partially housed in the first receiving groove 116. The rear locking assembly 50 is provided with a first labyrinth ring 51, a second labyrinth ring 52, a second precision nut 53 and a plurality of threaded parts 54.

[0043] The first labyrinth ring 51 is partially assembled at the first receiving groove 116. The first labyrinth ring 51 has a first flange 511 inside. The cross-section of the first flange 511 is slightly stepped. The first flange 511 has multiple planes with different height differences. The multiple planes are parallel. The first flange 511 faces the opening of the first receiving groove 116. The first labyrinth ring 51 has multiple second screw holes 512. The multiple second screw holes 512 are arranged in a ring-shaped manner with intervals around the axis of the first labyrinth ring 51. Each second screw hole 512 is aligned with each first screw hole 117. The number of second screw holes 512 matches the number of first screw holes 117. The second screw holes 512 are perforated.

[0044] The second labyrinth ring 52 is fitted onto the fifth circumferential surface 54. The second labyrinth ring 52 is aligned with the first labyrinth ring 51, and one end of the second labyrinth ring 52 abuts against the inner ring of the plurality of second bearings 41.

[0045] Please supplement with Figure 12 As shown, there is a first gap 55 between the first flange 511 of the first labyrinth ring 51 and the second labyrinth ring 52. The first gap 55 is in the shape of a meandering path. The first gap 55 can reduce the probability of liquids or cutting fluids entering the interior of the rotating shaft assembly structure through the rear lock assembly 50.

[0046] The second precision nut 53 is screwed and locked with the second threaded part 25, so that the second bearing assembly 40 is set on the fifth circumferential surface 24 and the first labyrinth ring 51 and the second labyrinth ring 52 do not come out of the body 10. The second precision nut 53 rotates with the rotating shaft 20. The second precision nut 53 presses against the second labyrinth ring 52, the inner ring of the second bearing 41 and the second washer 42, so that the second labyrinth ring 52, the inner ring of the second bearing 41 and the second washer 42 rotate with the rotating shaft 20, so that the second labyrinth ring 52, the inner ring of the second bearing 41 and the second washer 42 are in a tight fit with the rotating shaft 20.

[0047] The plurality of threaded components 54 are inserted into the second threaded hole 512 and are threaded into the plurality of first threaded holes 117, so that the first labyrinth ring 51 is assembled with the body 10. The number of threaded components 54 matches the number of first threaded holes 117, and the threaded components 54 are externally threaded.

[0048] Please continue reading. Figure 7 As shown, Figure 7 This is a perspective view of the rotating shaft assembly structure of the present invention. The rotating shaft 20 is pivotally mounted in the first receiving groove 11 and rotates rapidly. The first bearing assembly 30 and the second bearing assembly 40 are arranged between the body 10 and the rotating shaft 20. The first bearing assembly 30 and the second bearing assembly 40 are far apart. The rear locking assembly 50 is accommodated in the first receiving groove 116. The first gap 55 is provided between the first labyrinth ring 52 and the first labyrinth ring 51. The first gap 55 is in the shape of a meandering path.

[0049] Please see Figures 8 to 11 As shown, Figure 8 This is a side view of the first operating state of the rotating shaft assembly structure of the present invention. Figure 9 This is the present invention. Figure 8 Sectional view at BB, Figure 10 This is a cross-sectional view of the rotating shaft assembly structure of the present invention in its second operating state. Figure 11This is a cross-sectional view of the third operating state of the rotating shaft assembly structure of the present invention. First, the first bearing assembly 30 is fitted onto the rotating shaft 20, and the first precision nut 31 is screwed and locked into the first threaded part 22. Then, the rotating shaft 20 and the first bearing assembly 30 are housed within the body 10. Figure 9 As shown, the second bearing assembly 40 is then fitted onto the fifth circumferential surface 24, as follows. Figure 10 As shown, the first labyrinth ring 51 is housed in the first receiving groove 116, and the second labyrinth ring 52 is fitted onto the fifth circumferential surface 24. After fitting, the second precision nut 53 is screwed onto the second threaded portion 25 for secure fastening. Figure 11 As shown.

[0050] Please continue reading. Figure 13 and Figure 14 As shown, Figure 13 This is a cross-sectional view of the second embodiment of the present invention. Figure 14 This is a cross-sectional view of the third embodiment of the present invention. Please supplement with... Figure 11 In comparison, the rear of the drive shaft 20 is equipped with a different transmission component, which drives the rotating shaft 20 to rotate rapidly.

[0051] The advantages of the rotating shaft assembly structure of the present invention are as follows:

[0052] 1. The first precision nut 32 sets the plurality of first bearings 31 on the rotating shaft 20. When the rotating shaft 20 and the first bearing set 30 are set on the body 10, the slippage between the first bearing 31 and the rotating shaft 20 can be avoided, and the first bearing 31 and the body 10 can be fitted together more smoothly.

[0053] 2. When the rotating shaft 20 and the first bearing assembly 30 are assembled in the first receiving groove 11, the plurality of first bearings 31 are abutted against the first abutment 114, and the rotating shaft 20 and the first bearing assembly 30 can be assembled in the body 10 and the position is determined. The assembly has a foolproof design and has a better assembly structure.

[0054] 3. The second washer 42, the inner ring of the second bearing 41, and the second labyrinth ring 52 rotate with the rotating shaft 20. The second precision nut 53 causes the second washer 42 to abut against the fourth abutment 26. The second bearing assembly 40 can be assembled to a fixed position by locking the second precision nut 53, avoiding slippage between the second bearing assembly 40 and the rotating shaft 20, and thus having a better assembly structure.

[0055] 4. The first bearing 31 is positioned by the first precision nut 32, and the second bearing 41 is positioned by the second precision nut 53. The first precision nut 32 and the second precision nut 53 are located at the two ends of the body 10 and the rotating shaft 20 and have their own assembly functions, resulting in a better assembly structure.

[0056] 5. The first bearing 31 and the second bearing 41 are respectively provided at both ends of the rotating shaft 20, and the body 10 and the rotating shaft 20 have a better pivot structure, and both ends of the rotating shaft 20 have support.

[0057] 6. The rear lock assembly 50 is equipped with the second bearing assembly 40. There is a first gap 55 between the first labyrinth ring 51 and the second labyrinth ring 52. The first gap 55 is in the shape of a detour path. The probability of cutting fluid entering the interior of the rotating shaft assembly structure through the detour path of the first gap 55 and causing damage is greatly reduced.

[0058] Therefore, the rotating shaft assembly structure of the present invention has industrial applicability, novelty and progress, and can meet the application requirements for an invention patent, and an application is filed in accordance with the law.

Claims

1. A rotating shaft assembly structure, characterized in that: It includes: A body having a first receiving groove extending through it, the first receiving groove being circular in shape, having a first circumferential surface, a second circumferential surface, and a third circumferential surface within it, the first circumferential surface being located at an opening at one end of the first receiving groove, the third circumferential surface being located between the first and second circumferential surfaces, the diameter of the first circumferential surface being larger than the diameter of the third circumferential surface, thus providing a first abutment within the first receiving groove, the first abutment being planar; the diameter of the third circumferential surface being larger than the diameter of the second circumferential surface, thus providing a second abutment within the first receiving groove, the second abutment being planar. The main body is provided with a first receiving groove, and the first receiving groove is in communication with the first receiving groove; A rotating shaft is pivotally mounted within a first accommodating groove. The rotating shaft has a fourth circumferential surface and a first threaded portion. The first threaded portion is externally threaded and its maximum diameter is smaller than the outer diameter of the fourth circumferential surface, such that a third abutment is provided between the first threaded portion and the fourth circumferential surface. The rotating shaft also has a fifth circumferential surface that is far from the fourth circumferential surface. One end of the rotating shaft has a second threaded portion that is externally threaded. The rotating shaft also has a fourth abutment, and the fifth circumferential surface is located between the fourth abutment and the second threaded portion. A first bearing assembly is disposed between the body and the rotating shaft, and the first bearing assembly includes a plurality of first bearings, a first precision nut and a first washer; The plurality of first bearings are sleeved on the fourth circumferential surface, the plurality of first bearings are disposed between the first receiving groove and the fourth circumferential surface, and one end of the plurality of first bearings abuts against one end face of the rotating shaft; The first precision nut is screwed into and locked with the first threaded part, so that the plurality of first bearing assemblies are fixed on the fourth circumferential surface and cannot be displaced. The first precision nut rotates with the rotating shaft, and the first precision nut may or may not abut against the third abutment. The first washer fits onto the fourth circumferential surface, and the first washer is disposed between the plurality of first bearings and the first precision nut. The first washer rotates with the rotating shaft. A second bearing assembly is disposed between the body and the rotating shaft. The second bearing assembly and the first bearing assembly are disposed at opposite ends of the rotating shaft, and there is a gap between the second bearing assembly and the first bearing assembly. A rear locking assembly is provided on the body and the rotating shaft, and the rear locking assembly fixes the second bearing assembly.

2. The rotating shaft assembly structure as described in claim 1, characterized in that: in, This body is installed on various machine tools or various machining mother machines.

3. The rotating shaft assembly structure as described in claim 2, characterized in that: in, The first receiving groove is circular and is located near the second circumferential surface. The diameter of the first receiving groove is larger than the diameter of the second circumferential surface. Place The groove has a maximum diameter, and the first receiving groove is provided with a plurality of first screw holes. The plurality of first screw holes are arranged in a ring at intervals around the axis of the first receiving groove, and the number of the plurality of first screw holes is 6.

4. The rotating shaft assembly structure as described in claim 2, characterized in that: in, The rotating shaft rotates rapidly relative to the main body. One end of the rotating shaft is used to mount various cutting tools. Both ends of the rotating shaft protrude from the main body. The fourth circumferential surface is aligned with the first circumferential surface. The third abutment is planar. The fifth circumferential surface is aligned with the second circumferential surface. The rotating shaft has a sixth circumferential surface, which is aligned with the third circumferential surface. The rotating shaft is sequentially provided with the fourth circumferential surface, the third abutment, the first threaded portion, the sixth circumferential surface, the fourth abutment, the fifth circumferential surface, and the second threaded portion. The diameter of the fourth circumferential surface is larger than the diameter of the sixth circumferential surface, and the diameter of the sixth circumferential surface is larger than the diameter of the fifth circumferential surface.

5. The rotating shaft assembly structure as described in claim 2, characterized in that: in, The plurality of first bearings are disposed between the first circumferential surface and the fourth circumferential surface, and the other ends of the plurality of first bearings abut against the first abutment, so that the plurality of first bearings cannot be displaced on the first circumferential surface. The number of the plurality of first bearings is 3.

6. The rotating shaft assembly structure as described in claim 3, characterized in that: in, The second bearing assembly includes multiple second bearings and a second washer; the multiple second bearings are sleeved on the fifth circumferential surface, and the multiple second bearings are located between the second circumferential surface and the fifth circumferential surface, and the number of the multiple second bearings is 2; the second washer is sleeved on the fifth circumferential surface, and the second washer abuts against the fourth abutment and the inner ring of the multiple second bearings, and the second washer rotates with the rotating shaft.

7. The rotating shaft assembly structure as described in claim 6, characterized in that: in, The rear locking assembly is partially housed within the first receiving groove. The rear locking assembly includes a first labyrinth ring, a second labyrinth ring, a second precision nut, and multiple threaded components. The first labyrinth ring is located within the first receiving groove and contains a first retaining flange. The cross-section of the first retaining flange is slightly stepped, and the first retaining flange has multiple parallel planes with varying heights. The first retaining flange faces the opening of the first receiving groove. The first labyrinth ring has multiple second threaded holes arranged in a ring-like pattern around the axis of the first labyrinth ring. Each second threaded hole is aligned with each first threaded hole, and the number of second threaded holes matches the number of first threaded holes. The second threaded holes are perforated. The second labyrinth ring is fitted onto the fifth circumferential surface, aligned with the first labyrinth ring. One end of the second labyrinth ring abuts against the inner ring of the multiple second bearings. The first retaining flange of the first labyrinth ring and the second... A first gap exists between the labyrinth rings, and this first gap is in the form of a meandering path. This first gap reduces the probability of liquids or cutting fluids entering the interior of the rotating shaft assembly through the rear locking assembly. The second precision nut is screwed into and locked with the second threaded part, fixing the second bearing assembly to the fifth circumferential surface and preventing the first labyrinth ring and the second labyrinth ring from coming out of the body. The second precision nut rotates with the rotating shaft, pressing against the second labyrinth ring, the inner ring of the second bearing, and the second washer, causing the second labyrinth ring, the inner ring of the second bearing, and the second washer to rotate with the rotating shaft, resulting in a tight fit between the second labyrinth ring, the inner ring of the second bearing, and the second washer and the rotating shaft. The plurality of threaded parts are inserted through the second threaded hole and screwed into the plurality of first threaded holes, fixing the first labyrinth ring to the body. The number of threaded parts matches the number of first threaded holes, and the threaded parts are externally threaded.

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