Axial clamping connecting device
By combining threaded joints and conical surface interference fits, and utilizing the design of expansion components and locking nuts, the problem of insufficient rigidity in existing connection methods is solved, achieving a connection effect with high rigidity and convenient multiple disassembly and assembly.
Patent Information
- Application Number
- CN202520593187.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Existing connection methods lack rigidity when subjected to axial loads, shear loads, or torques, and are difficult to disassemble and reassemble repeatedly without damaging the connection holes.
It adopts a combination of threaded connection and conical surface interference fit, and achieves interference fit and axial clamping through the cooperation of expansion component and lock nut, and can be easily assembled and disassembled using conventional tools.
It achieves a high-rigidity connection, can be reused multiple times without damaging the connection hole, and is simple and economical to process.
Smart Images
Figure CN223767866U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of connectors, specifically to an axial clamping connection device. Background Technology
[0002] In a standard threaded connection, the screw and the mounting hole have a clearance fit. The axial tensile load is borne by the preload generated by the tightening torque, and the shear load is borne by the friction of the mating surfaces. The shear resistance is not strong, and the connection rigidity is limited. In a positioning bolt connection, the screw and the mounting hole have a tight fit tolerance. The shear load is borne by the screw, and the axial load it needs to withstand is usually not large. Positioning bolt connections have high installation positioning accuracy. Even a slight deviation in the hole positioning makes installation difficult. After a period of use, the bolt can easily get stuck in the mounting hole, often requiring hammering to remove it, and it is prone to wear on the mounting hole.
[0003] An interference fit is achieved by using the interference fit between parts to create pressure between their mating surfaces. During operation, torque or axial force is transmitted through the friction between the mating surfaces. Interference fits are generally divided into cylindrical interference fits and conical interference fits. Cylindrical interference fits are assembled using mechanical pressing or thermal expansion and contraction methods. The mating surfaces are easily scratched during assembly and disassembly, making them unsuitable for repeated assembly and disassembly. Conical interference fits are achieved by using the relative axial displacement of the enclosing part and the enclosed part to achieve an interference fit. They are assembled using hydraulic pressing or nut tightening methods, but the mating surfaces are difficult to machine.
[0004] In certain specific situations, it is necessary to form a tight, rigid joint to withstand axial loads, shear loads, or torques, just like a welded joint. However, it is also required that the joint be easy to assemble and disassemble without damaging the connection hole and be reusable. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, this utility model provides an axial clamping connection device that combines the advantages of threaded connection and conical surface interference fit connection. It can achieve interference fit and axial clamping without damaging the connection hole. It has the characteristics of convenient assembly and disassembly, can be assembled and disassembled repeatedly for reuse, strong connection rigidity, good manufacturability and economy.
[0006] The technical solution adopted by this utility model to solve its technical problem is:
[0007] An axial clamping connection device includes a core rod and an expansion assembly, a mounting nut, and a locking nut connected to the core rod. The core rod has a positioning part. The mounting nut is threaded to one end of the core rod near the positioning part. The locking nut is threaded to one end of the core rod away from the positioning part. The expansion assembly is sleeved on the core rod and located between the positioning part and the locking nut. Rotating the locking nut toward the positioning part drives the expansion assembly to expand.
[0008] As a further improvement to the above technical solution, the core rod includes a first connecting part, a second connecting part, and a mounting part. The first connecting part and the second connecting part are respectively located on both sides of the mounting part. The positioning part is disposed between the first connecting part and the mounting part. The mounting nut is threadedly connected to the first connecting part. The locking nut is threadedly connected to the second connecting part. The expansion assembly is movably sleeved on the mounting part.
[0009] As a further improvement to the above technical solution, the core rod is integrally formed from the first connecting part, the positioning part, the mounting part, and the second connecting part.
[0010] As a further improvement to the above technical solution, the diameter of the mounting part is larger than the diameter of the first connecting part and the second connecting part, a first washer is provided between the mounting nut and the positioning part, and a second washer is provided between the locking nut and the expansion assembly.
[0011] As a further improvement to the above technical solution, a first positioning groove is provided at the connection between the first connecting part and the positioning part, and a second positioning groove is provided at the connection between the mounting part and the second connecting part. The first positioning groove and the second positioning groove are respectively used to guide the installation of the first gasket and the second gasket.
[0012] As a further improvement to the above technical solution, a wrench hole is provided at the end of the first connecting part away from the positioning part.
[0013] As a further improvement to the above technical solution, the side of the positioning part near the mounting part is a conical surface, and the side of the positioning part near the first connecting part is a vertical surface. The vertical surface is perpendicular to the axis of the core rod, and the first gasket mates with the vertical surface.
[0014] As a further improvement to the above technical solution, the expansion assembly includes multiple inner conical sleeves and multiple outer conical sleeves. Both the inner and outer conical sleeves are movably sleeved on the core rod. The inner and outer conical sleeves are alternately arranged. The inner and outer conical sleeves are engaged by the conical surfaces at their ends. The outer conical sleeves are located at both ends. The outer conical sleeve near the positioning part engages with the conical surface on the positioning part through the conical surface at its end.
[0015] As a further improvement to the above technical solution, the expansion assembly further includes a semi-inner conical sleeve, which is movably sleeved on the core rod. The semi-inner conical sleeve and the outer conical sleeve at the end away from the positioning part are engaged by the conical surface at the end. The end of the semi-inner conical sleeve is engaged with the second gasket.
[0016] As a further improvement to the above technical solution, the end of the semi-inner conical sleeve extends to the second positioning groove. When the locking nut drives the second washer to move toward the expansion assembly, it is used to push the semi-inner conical sleeve to move so that the outer conical sleeve expands outward.
[0017] The beneficial effects of this utility model are:
[0018] 1. The connecting device of this utility model adopts a core rod, inner and outer conical sleeves, nuts, washers and other structures; the connection between each structure is simple and the transition is reasonable, and the structure is simple and easy to replace.
[0019] 2. The connecting device of this utility model can be assembled using conventional wrenches and screws, without the need for cumbersome and expensive installation methods such as cold shrinkage or hydraulics, and is easy to disassemble and reinstall.
[0020] 3. The connecting device of this utility model has few types of parts. Nuts and washers can be conventional standard parts, and core rods and tapered sleeves can be processed by conventional CNC turning and CNC milling methods. Moreover, the structure is reasonable, the number of processing clamping times is small, and the processing cycle is short.
[0021] 4. The connecting device of this utility model can achieve both radial interference fit connection and axial clamping preload requirements. Relying on the radial expansion of the tapered sleeve, it squeezes and fits against the mounting hole wall of the plate to form an interference fit. There is no relative sliding between the surfaces, and the mounting hole will not be worn. After disassembly, the same rigid connection can be achieved by reinstalling and adjusting the tightening torque. It can be repeatedly installed and used without weakening its connection capability. Attached Figure Description
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] Figure 1 This is an assembly diagram of an axial clamping connection device according to an embodiment of the present invention;
[0024] Figure 2 This is an exploded view of the structure of an axial clamping connection device according to an embodiment of the present invention;
[0025] Figure 3 This is a schematic diagram of the core rod in an axial clamping connection device according to an embodiment of the present invention;
[0026] Figure 4 This is a cross-sectional view of an axial clamping connection device according to an embodiment of the present invention;
[0027] Figure 5 This is a schematic diagram of the usage state of an axial clamping connection device according to an embodiment of this utility model.
[0028] Reference numerals: 1. Core rod; 11. Mounting part; 12. First connecting part; 13. Second connecting part; 14. Positioning part; 141. Conical surface; 142. Vertical surface; 15. First positioning groove; 16. Second positioning groove; 17. Tightening hole; 2. Expansion assembly; 21. Outer conical sleeve; 22. Inner conical sleeve; 23. Semi-inner conical sleeve; 3. Mounting nut; 4. Locking nut; 5. First washer; 6. Second washer; 7. First plate; 8. Second plate. Detailed Implementation
[0029] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.
[0030] Reference Figure 1 , Figure 2 This utility model provides an axial clamping connection device, including a core rod 1 and an expansion assembly 2, a mounting nut 3, and a locking nut 4 connected to the core rod 1. Referring to the figure, the core rod 1 is provided with a positioning part 14. The mounting nut 3 is threadedly connected to the core rod 1 at one end near the positioning part 14. The locking nut 4 is threadedly connected to the core rod 1 at one end away from the positioning part 14. The expansion assembly 2 is sleeved on the core rod 1 and located between the positioning part 14 and the locking nut 4. Rotating the locking nut 4 towards the positioning part 14 drives the expansion assembly 2 to expand radially.
[0031] Reference Figure 5This utility model's axial clamping connection device is used to clamp and fix two plates (first plate 7 and second plate 8). The expansion component 2 is installed on the core rod 1. It is understood that the outer diameter of the expansion component 2 in its free state is smaller than the diameter of the mounting hole on the plate, facilitating insertion into the mounting hole. Then, the locking nut 4 is tightened to a certain installation torque, causing the expansion component 2 to expand radially and tightly press against the mounting hole, forming an interference fit. Then, the mounting nut 3 is tightened to a certain installation torque, forming an axial clamping of the two plates, thus fixing the two plates. For disassembly, simply loosen the locking nut 4; the expansion component 2 returns to its free state and can be easily removed from the mounting hole without damaging it. It can be repeatedly installed and used.
[0032] Furthermore, refer to Figure 3 The core rod 1 includes a mounting part 11, a first connecting part 12, a second connecting part 13, and a positioning part 14. The first connecting part 12 and the second connecting part 13 are located on both sides of the mounting part 11, and the positioning part 14 is disposed between the first connecting part 12 and the mounting part 11. Both the first connecting part 12 and the second connecting part 13 are provided with threads. The mounting nut 3 is threadedly connected to the first connecting part 12, and the locking nut 4 is threadedly connected to the second connecting part 13. The expansion component 2 is movably sleeved on the mounting part 11. The first connecting part 12, the positioning part 14, the mounting part 11, and the second connecting part 13 are integrally formed, which simplifies the processing and reduces costs.
[0033] In some embodiments, refer to Figure 3 The first connecting part 12 is provided with a wrench hole 17 at the end away from the positioning part 14, and the core rod 1 can be rotated by a wrench tool.
[0034] In this embodiment, refer to Figure 2-4 The diameter of the mounting part 11 is larger than the diameter of the first connecting part 12 and the second connecting part 13, so that the expansion component 2 can be fitted onto the mounting part 11. A first washer 5 is provided between the mounting nut 3 and the positioning part 14, and a second washer 6 is provided between the locking nut 4 and the expansion component 2. The first washer 5 and the second washer 6 can increase the friction and distribute the pressure evenly when the connecting device clamps the plate, thus playing a role in fastening and protection.
[0035] Furthermore, a first positioning groove 15 is provided at the connection between the first connecting part 12 and the positioning part 14, and a second positioning groove 16 is provided at the connection between the mounting part 11 and the second connecting part 13. The first positioning groove 15 and the second positioning groove 16 can respectively guide the installation of the first gasket 5 and the second gasket 6.
[0036] In this embodiment, refer to Figure 3The positioning part 14 has a conical surface 141 on the side near the mounting part 11, and a vertical surface 142 on the side of the positioning part 14 that passes through the first connecting part 12. The vertical surface 142 is perpendicular to the axis of the core rod 1. The first gasket 5 cooperates with the vertical surface 142. When the first gasket 5 is installed, the vertical surface 142 limits the first gasket 5.
[0037] Reference Figure 2 and Figure 4 The expansion assembly 2 includes multiple inner conical sleeves 22, multiple outer conical sleeves 21, and a semi-inner conical sleeve 23. The inner conical sleeves 22, outer conical sleeves 21, and semi-inner conical sleeves 23 are all movably sleeved on the core rod 1. The inner conical sleeves 22 and outer conical sleeves 21 are alternately arranged. The inner conical sleeves 22 and outer conical sleeves 21 are engaged by the conical surfaces at their ends. The outer conical sleeves 21 are located at both ends. The outer conical sleeve 21 near the positioning part 14 engages with the conical surface 141 on the positioning part 14 by the conical surface at its end. The outer conical sleeve 21 away from the positioning part 14 engages with the semi-inner conical sleeve 23 by the conical surface at its end. The end of the semi-inner conical sleeve 23 engages with the second gasket 6, and the end of the semi-inner conical sleeve 23 extends to the second positioning groove 16.
[0038] It is understandable that when the locking nut 4 is tightened, the second washer 6 is moved toward the expansion assembly 2. The second washer 6 pushes the semi-inner conical sleeve 23 to move. The inner conical sleeve 22, the outer conical sleeve 21 and the semi-inner conical sleeve 23 press against each other to make the outer conical sleeve 21 expand radially outward, thereby tightly pressing and fitting with the mounting hole to form an interference fit.
[0039] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. An axial clamping connection arrangement, characterized by: The core rod, the expansion assembly, the mounting nut and the locking nut, the core rod is provided with a positioning part, the mounting nut is threadedly connected to one end of the core rod close to the positioning part, the locking nut is threadedly connected to one end of the core rod away from the positioning part, and the expansion assembly is sleeved on the core rod and located between the positioning part and the locking nut, and the locking nut is rotated to move towards the positioning part to drive the expansion assembly to expand.
2. An axial clamping connection according to claim 1, characterized in that: The core rod comprises a first connecting part, a second connecting part and a mounting part, the first connecting part and the second connecting part are located on both sides of the mounting part respectively, the positioning part is arranged between the first connecting part and the mounting part, the mounting nut is threadedly connected to the first connecting part, the locking nut is threadedly connected to the second connecting part, and the expansion assembly is movably sleeved on the mounting part.
3. An axial clamping connection according to claim 2, characterized in that: The core rod is integrally formed by the first connecting part, the positioning part, the mounting part and the second connecting part.
4. An axial clamping connection according to claim 2, characterized in that: One end of the first connecting part away from the positioning part is provided with a wrench hole.
5. An axial clamping connection according to claim 2, characterized in that: The diameter of the mounting part is greater than the diameters of the first connecting part and the second connecting part, a first gasket is arranged between the mounting nut and the positioning part, and a second gasket is arranged between the locking nut and the expansion assembly.
6. An axial clamping connection according to claim 5, characterized in that: First positioning grooves are arranged at the connection between the first connecting part and the positioning part, and second positioning grooves are arranged at the connection between the mounting part and the second connecting part, and the first positioning grooves and the second positioning grooves are respectively used for guiding the installation of the first gasket and the second gasket.
7. An axial clamping connection according to claim 6, characterized in that: One side of the positioning part close to the mounting part is a conical surface, one side of the positioning part close to the first connecting part is a vertical surface, the vertical surface is perpendicular to the axis of the core rod, and the first gasket is matched with the vertical surface.
8. An axial clamping connection according to claim 7, characterized in that: The expansion assembly comprises a plurality of inner conical sleeves and a plurality of outer conical sleeves, the inner conical sleeves and the outer conical sleeves are movably sleeved on the core rod, the inner conical sleeves and the outer conical sleeves are arranged alternately, the inner conical sleeves and the outer conical sleeves are matched through the conical surfaces of the end portions, the first and last ends are the outer conical sleeves, and the outer conical sleeve close to one end of the positioning part is matched with the conical surface on the positioning part through the conical surface of the end portion.
9. An axial clamping connection according to claim 8, characterized in that: The expansion assembly further comprises a half inner conical sleeve, the half inner conical sleeve is movably sleeved on the core rod, the half inner conical sleeve and the outer conical sleeve away from one end of the positioning part are matched through the conical surfaces of the end portions, and the end portion of the half inner conical sleeve is matched with the second gasket.
10. An axial clamping connection according to claim 9, characterized in that: The end portion of the half inner conical sleeve extends to the second positioning groove, and when the locking nut drives the second gasket to move towards the expansion assembly, the half inner conical sleeve is pushed to move, so that the outer conical sleeve expands outward.