Elastic interference fit shaft shoulder ring with controllable inner diameter and inner diameter adjusting method

Abstract

The invention discloses an elastic interference fit shaft shoulder ring with a controllable inner diameter and an inner diameter adjusting method.The elastic interference fit shaft shoulder ring comprises an annular body, at least one elastic deformation part is arranged on the annular body, an operable control mechanism is arranged on the elastic deformation part, and the elastic deformation part can generate elastic deformation by operating the control mechanism; therefore, the inner diameter of the annular body is changed. The elastic deformation part comprises a plurality of hollowed-out holes formed in the annular body, and an elastic curved bar is formed between every two adjacent hollowed-out holes. The control mechanism comprises adjusting pieces arranged on the elastic deformation parts, and the elastic curved bars are adjusted through the corresponding adjusting pieces to generate tensile deformation. By arranging a controllable elastic deformation structure, the problems that an interference fit shaft shoulder ring is difficult to disassemble and assemble at normal temperature and the positioning precision of clearance fit is poor are solved.

Description

Technical Field

[0001] This invention belongs to the field of fitting and limiting technology of shaft parts, and particularly relates to a flexible interference fit shaft shoulder ring with controllable inner diameter and an inner diameter adjustment method. Background Technology

[0002] For some shaft products requiring precise axial positioning, due to assembly sequence or structural reasons, it is impossible to use an integral shoulder structure to axially limit the components. In such cases, shoulder rings with different fits and installation methods can be selected to replace the shoulder structure. However, the installation and fit methods of such shoulder ring products have their drawbacks. For example, interference fits obtained by cold shrinkage can have extremely high positioning accuracy, but they are not easy to disassemble and are subject to higher requirements for the environment and conditions for product assembly and maintenance; while clearance fits are easy to disassemble and assemble, the positioning accuracy may not meet the usage requirements. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides an elastic interference fit shoulder ring with controllable inner diameter and an inner diameter adjustment method. By setting a controllable elastic deformation structure, the problems of difficulty in disassembling and assembling the interference fit shoulder ring at room temperature and poor positioning accuracy of the clearance fit are solved.

[0004] Technical solution: To achieve the above objective, the present invention provides an elastic interference fit shoulder ring with controllable inner diameter, comprising an annular body, wherein the inner circumferential surface of the annular body is a complete annular surface; the annular body is provided with at least one elastic deformation part, and the elastic deformation part is provided with an operable control mechanism, wherein by operating the control mechanism, the elastic deformation part can be elastically deformed, thereby causing the inner diameter of the annular body to change.

[0005] Furthermore, the elastic deformation part includes a plurality of hollow holes formed on the annular body, and an elastic curved rod is formed between adjacent hollow holes; the hollow holes are waist-shaped holes, oblong holes or elliptical holes.

[0006] Furthermore, the control mechanism includes an adjusting member disposed on the elastic deformation part, and the elastic crank is adjusted by the corresponding adjusting member to generate tensile deformation.

[0007] Furthermore, the adjusting element is a set screw, and the annular body is provided with a threaded hole that mates with the set screw.

[0008] Furthermore, the annular body is also provided with a limiting structure, and the end of the set screw cooperates with the limiting structure.

[0009] Furthermore, the limiting structure is a limiting blind hole or a limiting groove;

[0010] Tighten the set screw, so that the end of the set screw extends into and presses against the limiting blind hole or limiting groove to stretch the elastic crank.

[0011] Furthermore, the number of elastic deformation portions is three, and they are evenly distributed along the circumference of the annular body;

[0012] Furthermore, each group of elastic deformation portions comprises several units, which are arranged side by side along the axial direction of the annular body;

[0013] By adjusting each of the set screws, the inner hole of the annular body can undergo a radial dimensional change and return to its original shape.

[0014] A method for adjusting the inner diameter of an elastically interference-fit shoulder ring with controllable inner diameter involves operating the set screw to drive an elastic crank on the ring body to undergo elastic deformation. This elastic deformation of the crank controls a reversible dimensional change in the inner diameter of the ring body. Specifically, the operation is as follows:

[0015] Tighten the set screws of the three sets of adjusting members evenly distributed along the circumference of the annular body, so that the ends of the set screws press against the corresponding limiting structures, thereby stretching the elastic crank and causing the inner hole of the annular body to expand radially, thereby forming an assembly gap with the mating shaft.

[0016] Loosen the set screw, and the elastic crank returns to its original shape, so that the inner hole of the annular body and the mating shaft form an interference fit.

[0017] Furthermore, the operating principle of the adjusting parts is the same during assembly and disassembly. Before assembly, the inner diameter of the shoulder ring needs to be adjusted to the expanded state. During assembly, the set screws are loosened and tightened in sequence until the elastic deformation of the shoulder ring completely disappears and it grips the mating shaft. During disassembly, the set screws are tightened in sequence to expand the inner diameter of the shoulder ring to a gap with the mating shaft.

[0018] The three sets of adjusting components are divided into several layers according to their axial dimensions. Adjusting components in the same layer have the same function. The function and operation of the set screws of each layer of adjusting components are as follows:

[0019] I. Coaxial Functional Layer

[0020] Loosen the first and fifth set screws located at the edge of each set of adjusting components, so that the elastic cranks on the first and fifth set screw sides can elastically recover, so that the annular body positioned on the mating shaft is coaxial with the mating shaft;

[0021] II. Positioning and Coaxial Retention Layer

[0022] Loosen the second and fourth set screws located between the middle and edge positions in each set of adjusting components, so that the elastic cranks on both sides of the second and fourth set screws can elastically recover, thereby coaxially positioning and holding the annular body on the mating shaft.

[0023] III. Positioning Functional Layer

[0024] Loosen the third set screw in the middle position of each set of adjusting parts, so that the elastic cranks on both sides of the third set screw can elastically recover, so as to accurately position the annular body on the mating shaft;

[0025] IV. Interference Fit Operation

[0026] All the set screws are loosened in sequence, in the order of first set screw, second set screw, third set screw, fourth set screw, and fifth set screw, thereby relieving the stress control of all the set screws on all the elastic curved rods, restoring the elastic curved rods to their original state, and making the inner hole of the annular body form an interference fit with the mating shaft.

[0027] Beneficial effects: This invention allows the inner diameter of the shoulder ring to expand elastically by operating the set screw at room temperature, creating an assembly clearance. This eliminates the need for complex processes and specialized equipment such as heating, cooling, or heavy-duty pressing required for traditional interference fits, greatly reducing operational difficulty and cost. When the set screw is removed for adjustment, the elastically deformed portion returns to its original shape, forming a strong interference fit between the shoulder ring and the shaft, resulting in high positioning accuracy and reliable connection rigidity. The design employs a circumferentially distributed and axially parallel multi-curved rod elastic deformation portion, ensuring a reasonable stress distribution, avoiding localized plastic deformation, and guaranteeing the durability and reliability of the structure under repeated disassembly and assembly. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the interference fit elastic shaft shoulder ring of the present invention. Figure 1 ;

[0029] Figure 2 This is a side view of the interference fit elastic shaft shoulder ring of the present invention.

[0030] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along section line AA.

[0031] Figure 4 This is a schematic diagram of the overall structure of the interference fit elastic shaft shoulder ring of the present invention. Figure 2 ;

[0032] Figure 5 A schematic diagram of the structure for mechanical analysis of the interference fit elastic shaft shoulder ring. Detailed Implementation

[0033] The invention will now be further described with reference to the accompanying drawings.

[0034] like Figure 1 , Figure 2 as well as Figure 3 As shown, a controllable inner diameter elastic interference fit shoulder ring includes an annular body 1. The annular body 1 has at least one elastic deformation portion, and the elastic deformation portion has an operable control mechanism 2. By operating the control mechanism 2, the elastic deformation portion can be elastically deformed, thereby changing the inner diameter of the annular body 1. By setting the elastic deformation portion and the control mechanism 2, the active and controllable change of the inner diameter of the shoulder ring is achieved, fundamentally solving the problems of difficulty in disassembling and assembling interference fit parts at room temperature and poor positioning accuracy in clearance fits.

[0035] The elastic deformation section includes multiple hollow holes 3 formed on the annular body 1, with an elastic curved rod 4 formed between adjacent hollow holes 3. The elastic deformation section, consisting of hollow holes 3 and elastic curved rods 4 formed therefrom, provides a specific, efficient, and reliable way to achieve elastic deformation, with a simple structure and significant elastic effect.

[0036] More specifically, the perforated hole 3 is an oblong hole, a long oval hole, or an elliptical hole. These hole shapes can optimize stress distribution, avoid stress concentration, and ensure the fatigue life and reliability of the elastic deformation part under repeated use.

[0037] like Figure 3 As shown, the control mechanism 2 includes an adjusting member 5 disposed on the elastic deformation part, and the elastic crank 4 is adjusted by the corresponding adjusting member 5 to generate tensile deformation. More specifically, the adjusting member 5 is a set screw, and the annular body 1 is provided with a threaded hole 6 that mates with the set screw. The structure is standard, simple, low-cost, and precise in adjustment, and easy to operate and control the preload.

[0038] like Figure 3 As shown, the annular body 1 is also provided with a limiting structure 7, and the end of the set screw cooperates with the limiting structure 7. The rotational feed of the set screw on the limiting structure 7 is converted into a pulling force on the elastic crank 4, preventing the screw from slipping and damaging the crank, and ensuring the effectiveness and stability of force transmission.

[0039] More specifically, the limiting structure 7 is a limiting blind hole or a limiting groove; tightening the set screw, with its end extending into and pressing against the limiting blind hole or limiting groove, stretches the elastic curved rod 4. Since the tensile force exerted by the set screw on the elastic curved rod 4 is much less than the elastic limit of the shoulder ring material, the elastic curved rod 4 does not undergo plastic deformation. When the set screw is loosened to release the stress on the elastic curved rod 4, the elastic deformation of the elastic curved rod 4 completely disappears.

[0040] The number of elastic deformation parts is three, and they are evenly distributed along the circumference of the annular body 1. The circumferential distribution ensures the roundness and centering accuracy of the inner hole expansion. Moreover, each group of elastic deformation parts consists of several parts, which are arranged in parallel along the axial direction of the annular body 1. This makes the multiple axially parallel elastic curved rods 4 significantly increase the range of the deformation area, reduce the stress of a single elastic curved rod 4, and make the expansion more uniform and controllable, with stronger load-bearing capacity.

[0041] In this invention, by adjusting each of the set screws, the inner hole of the annular body 1 can undergo a radial dimensional change and return to its original state. Tightening the set screws stretches the elastic crank 4, and loosening the set screws relieves stress and restores the elastic crank 4 to its original state. In addition, it is also suitable for assembly with a tapered shaft.

[0042] The inner circumferential surface of the annular body 1 is a complete circular annular surface, ensuring that the shoulder ring can form a complete circumferential interference fit with the shaft, providing a stable and uniform axial positioning and bearing surface.

[0043] The elastic shoulder ring of this invention can replace the one-piece machined shoulder structure. At the same time, its advantages of easy disassembly and assembly in a normal temperature environment greatly facilitate the assembly and replacement of parts, and the positioning accuracy is reliable, which greatly saves costs for users.

[0044] A method for adjusting the inner diameter of an elastic interference fit shoulder ring with controllable inner diameter involves operating the set screws to drive the elastic crank 4 on the annular body 1 to undergo elastic deformation. This elastic deformation of the crank 4 controls a reversible dimensional change in the inner diameter of the annular body 1. Specifically, the method involves tightening the set screws of three sets of adjusting components 5 evenly distributed circumferentially along the annular body 1, causing the ends of the set screws to press against the corresponding limiting structures 7, thus stretching the elastic crank 4 and causing radial expansion of the inner hole of the annular body 1, thereby forming an assembly gap with the mating shaft. Loosening the set screws allows the elastic crank 4 to return to its original shape, resulting in an interference fit between the inner hole of the annular body 1 and the mating shaft. This method fundamentally replaces the physical means such as thermal expansion or contraction relied upon in traditional interference fits, eliminating the potential damage risks to the fitting accuracy and material properties of parts caused by thermal stress, instantaneous high stress, or plastic deformation. It enables repeatable high-precision assembly and disassembly operations that can be completed at room temperature.

[0045] During assembly and disassembly, the operating principle of adjusting part 5 is the same. Before assembly, the inner diameter of the shoulder ring needs to be adjusted to the expanded state. During assembly, the set screws are loosened and tightened in sequence until the elastic deformation of the shoulder ring completely disappears and it grips the mating shaft. During disassembly, the set screws are tightened in sequence to expand the inner diameter of the shoulder ring to a gap with the mating shaft.

[0046] like Figure 4 As shown, the three sets of adjusting members 5 are divided into several layers according to their axial dimensions. The adjusting members 5 in the same layer have the same function. The function and operation of the set screws of each layer of adjusting members 5 are as follows:

[0047] I. Coaxial Functional Layer

[0048] Loosen the first set screw a and the fifth set screw e located at the edge position in each set of adjusting parts 5, so that the elastic crank 4 on the side of the first set screw a and the side of the fifth set screw e can elastically recover, so that the annular body 1 located on the mating shaft is coaxial with the mating shaft, effectively correcting the possible axial tilt or eccentricity of the annular body 1.

[0049] II. Positioning and Coaxial Retention Layer

[0050] Loosen the second set screw b and the fourth set screw d located between the middle and edge positions in each set of adjusting components 5, so that the elastic cranks 4 on both sides of the second set screw b and the fourth set screw d can elastically recover, thereby coaxially positioning and holding the annular body 1 on the mating shaft.

[0051] III. Positioning Functional Layer

[0052] Loosen the third set screw c located in the middle position in each set of adjusting components 5, so that the elastic cranks 4 on both sides of the third set screw c can elastically recover, so as to accurately position the annular body 1 on the mating shaft, thereby establishing a radial reference between the annular body 1 and the mating shaft.

[0053] IV. Interference Fit Operation

[0054] All the set screws are loosened in sequence, in the order of first set screw a, second set screw b, third set screw c, fourth set screw d, and fifth set screw e. This releases the stress control of all the set screws on all the elastic curved rods 4, restores the elastic curved rods 4 to their original state, and makes the inner hole of the annular body 1 form an interference fit with the mating shaft, completely releasing all constraints and achieving balanced stress release.

[0055] This sequential design ensures that the recovery process of each elastic deformation part of the annular body is synchronous and coordinated, and realizes the positioning of the annular body before coaxial operation. It effectively avoids problems such as ring body skewing, jamming or eccentricity caused by asynchronous stress release and difficulties in positioning and coaxial operation, thus ensuring that the assembly finally obtains extremely high coaxiality and repeatability accuracy.

[0056] like Figure 5As shown, to simplify the analysis process, the curved rod can be approximated as a straight rod for analysis and calculation. At the same time, the neutral axis of the curved rod is approximated to coincide with the centroidal axis, and the influence of the screw's own strain on the structure is ignored. Only the stress and strain of the curved rod approximated as a straight rod along its own axis are analyzed. The straight rod referred to in the mechanical analysis below represents the curved rod structure of the elastic region of the shoulder ring.

[0057] Based on the mechanical properties of the shoulder ring material, the set screws are tightened one by one during the elastic phase of the material to slowly and steadily apply an axial tensile force to the straight rod. Under the action of the axial tensile force, the straight rod elongates axially. When the tensile stress does not exceed the proportional limit of the material, the stress σ is proportional to the strain ε, and the material obeys Hooke's Law, which can be written as σ = Eε. Here, E is the elastic modulus of the material, and ε is the linear strain in the axial direction, equal to the ratio of the elongation Δl in the axial direction to the original length l, i.e., ε = Δl / l; for the straight rod, the normal stress σ is also equal to the ratio of the tensile force P to the original cross-sectional area A of the straight rod, i.e., σ = P / A.

[0058] During use, in order to facilitate the disassembly and assembly of the shoulder ring, the set screws need to be tightened in a specific order. Under the pushing action of the set screws, several straight rod structures in the three elastic structures evenly distributed along the circumference of the shoulder ring are stretched, causing the center O of the inner diameter of the three circular surfaces to deviate away from the center to O′. The inner diameter of the shoulder ring also deviates from its original position, resulting in a radial assembly gap of 0.02mm between the inner diameter of the shoulder ring and the mating shaft.

[0059] From σ=Eε, ε=Δl / l, σ=P / A, we can get Δl=P·l / E·A.

[0060] Since the above formula applies to cases where both the cross-sectional area A and the axial force P of the rod are constant, in practice, the curved rod in the elastic structure of the shoulder ring is approximated as a straight rod. Then, a cross-section of the straight rod is drawn within the cross-section of the shoulder ring. As shown in the figure, the contour lines on both sides along the axis of the straight rod are close to a hyperbola. Therefore, the cross-section of the straight rod varies along its own axis, and the axial force also varies along the axis of the straight rod. To analyze the relationship between the strain and axial force of the actual straight rod, a small segment dx needs to be taken from the straight rod using adjacent cross-sections. The formula Δl=P·l / E·A is applied to this small segment to calculate the deformation d(Δl)=P(x)·dx / E·A(x), where P(x) and A(x) represent the axial force and cross-sectional area of ​​this small segment, respectively; they are functions of x. Integrating the above formula, the elongation of the rod is obtained as Δl=∫ l P(x)·dx / E·A(x). Since calculating the cross-sectional area of ​​a real straight rod is complex, to simplify the calculation, the longitudinal section of the straight rod along its own axis is approximated as a rectangle. In the calculation, it is assumed that the cross-section of the straight rod does not change along the axis, the axial force also remains constant along the axis, and the line of action of the axial force coincides with the axis. From... Figure 4 It can be seen that the elongation of the straight rod along its own axis causes the center O of the three annular segments of the shoulder ring to deviate away from the center to O′, with the radial offset distance approximately equal to the elongation Δl / 2 of the straight rod. The elastic modulus of steel is E = 206 GPa. Based on actual needs, the elongation Δl = 0.02 mm, the length of the straight rod is l = 25 mm, and the cross-sectional area of ​​the straight rod is A = 68 mm². 2 The strain of the straight rod is calculated as follows:

[0061] ε = Δl / l = 0.02 / 25 = 0.0008

[0062] The tensile stress on the cross section of the straight rod can be determined using Hooke's Law:

[0063] σ = Eε = 206 × 10 9 ×0.0008=164.8×10 6 Pa = 164.8 MPa

[0064] Straight rod tension:

[0065] P=Aσ=68×10 -6 ×164.8×10 6 =11206.4N≈11.21KN

[0066] Since the preload of the set screw and the tension on the straight rod are a pair of reaction forces, the preload of the set screw is approximately 11.21 kN. Before assembling or disassembling the shoulder ring, tighten the set screws one by one with this preload. The inner diameter of the shoulder ring will shift radially outward by 0.02 mm, and there will be a gap of approximately 0.02 mm between the inner diameter of the shoulder ring and the diameter of the mating shaft. Without the need for cold shrinkage, heat fitting, or other processes, the shoulder ring can be easily assembled and disassembled at room temperature.

[0067] The advantages of this invention are as follows:

[0068] 1) Easy to operate and efficient to disassemble and assemble: The inner diameter of the shoulder ring can be elastically expanded by operating the set screw at room temperature, creating an assembly gap. This eliminates the need for complex processes and special equipment such as heating, cooling or heavy pressing required for traditional interference fits, greatly reducing the difficulty and cost of operation.

[0069] 2) High positioning accuracy and reliable connection: After removing the set screw for adjustment and relieving the stress on the elastic crank, the elastic deformation completely disappears, the shoulder ring can return to its original shape, and form an interference fit with the shaft, resulting in high positioning accuracy and reliable connection rigidity.

[0070] 3) Reasonable structure and long service life: The design of the elastic deformation part of the multi-curved bar with circumferential distribution and axial parallel arrangement is adopted. The stress distribution is reasonable, avoiding local plastic deformation and ensuring the durability and reliability of the structure under repeated disassembly and assembly.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flexible interference fit shoulder ring with controllable inner diameter, comprising an annular body (1), characterized in that: The inner circumferential surface of the annular body (1) is a complete annular surface; the annular body (1) is provided with at least one elastic deformation part, and the elastic deformation part is provided with an operable control mechanism (2). By operating the control mechanism (2), the elastic deformation part can be elastically deformed so that the inner diameter of the annular body (1) changes.

2. The elastically interference-fit shoulder ring with controllable inner diameter according to claim 1, characterized in that: The elastic deformation part includes a plurality of hollow holes (3) opened on the annular body (1), and an elastic curved rod (4) is formed between adjacent hollow holes (3); the hollow holes (3) are waist-shaped holes, oblong holes or elliptical holes.

3. The elastically interference-fit shoulder ring with controllable inner diameter according to claim 2, characterized in that: The control mechanism (2) includes an adjustment member (5) disposed on the elastic deformation part, and the elastic crank (4) generates tensile deformation by adjusting the corresponding adjustment member (5).

4. The elastically interference-fit shoulder ring with controllable inner diameter according to claim 3, characterized in that: The adjusting component (5) is a set screw, and the annular body (1) is provided with a threaded hole (6) that mates with the set screw.

5. A controllable inner diameter elastic interference fit shoulder ring according to claim 4, characterized in that: The annular body (1) is also provided with a limiting structure (7), and the end of the set screw cooperates with the limiting structure (7).

6. The elastically interference-fit shoulder ring with controllable inner diameter according to claim 5, characterized in that: The limiting structure (7) is a limiting blind hole or a limiting groove; Tighten the set screw, and extend the end of the set screw into and press against the limiting blind hole or limiting groove to stretch the elastic crank (4).

7. A controllable inner diameter elastic interference fit shoulder ring according to claim 6, characterized in that: The number of elastic deformation sections is three, and they are evenly distributed along the circumference of the annular body (1).

8. A controllable inner diameter elastic interference fit shoulder ring according to claim 7, characterized in that: The number of elastic deformation parts in each group is several, and they are arranged side by side along the axial direction of the annular body (1); By adjusting each of the set screws, the inner hole of the annular body (1) can undergo a radial dimensional change and return to its original state.

9. The method for adjusting the inner diameter of an elastically interference-fit shoulder ring with controllable inner diameter according to claim 8, characterized in that: By operating the set screw, the elastic crank (4) on the annular body (1) is driven to produce elastic deformation. Through the elastic deformation of the elastic crank (4), the inner diameter of the annular body (1) is controlled to undergo a reversible dimensional change. Specifically, the operation is as follows: Tighten the set screws of the three sets of adjusting parts (5) evenly distributed around the circumference of the annular body (1) so that the ends of the set screws press against the corresponding limiting structure (7) to stretch the elastic crank (4) and cause the inner hole of the annular body (1) to expand radially, thereby forming an assembly gap with the mating shaft. Loosen the set screw, and the elastic crank (4) returns to its original shape, so that the inner hole of the annular body (1) and the mating shaft form an interference fit.

10. The method for adjusting the inner diameter of an elastically interference-fit shoulder ring with controllable inner diameter according to claim 9, characterized in that: During assembly and disassembly, the operating principle of the adjusting part (5) is the same. Before assembly, the inner diameter of the shoulder ring needs to be adjusted to the expanded state. During assembly, the set screws are loosened and tightened in sequence until the elastic deformation of the shoulder ring completely disappears and it hugs the mating shaft. During disassembly, the set screws are tightened in sequence so that the inner diameter of the shoulder ring expands to have a gap with the mating shaft. The three sets of adjusting components (5) are divided into several layers according to their axial dimensions. The adjusting components (5) in the same layer have the same function. The function and operation of the set screws of each layer of adjusting components (5) are as follows: I. Coaxial Functional Layer Loosen the first set screw (a) and the fifth set screw (e) located at the edge position in each set of adjusting parts (5) so that the elastic crank (4) on the side of the first set screw (a) and the side of the fifth set screw (e) can elastically recover so that the annular body (1) located on the mating shaft is coaxial with the mating shaft; II. Positioning and Coaxial Retention Layer Loosen the second set screw (b) and the fourth set screw (d) located between the middle position and the edge position in each set of adjusting parts (5), so that the elastic crank (4) on both sides of the second set screw (b) and the fourth set screw (d) can elastically recover, so as to coaxially position the annular body (1) on the mating shaft and keep it there; III. Positioning Functional Layer Loosen the third set screw (c) located in the middle position in each set of adjusting parts (5) so that the elastic cranks (4) on both sides of the third set screw (c) can elastically recover, so as to accurately position the annular body (1) on the mating shaft. IV. Interference Fit Operation All the set screws are loosened in sequence, in the order of first set screw (a), second set screw (b), third set screw (c), fourth set screw (d), and fifth set screw (e), thereby relieving the stress control of all the set screws on all the elastic curved rods (4), restoring the elastic curved rods (4) to their original state, and making the inner hole of the annular body (1) form an interference fit with the mating shaft.

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