Riveting fastener and connecting structure
By designing an interference fit and anti-rotation structure for the rivet fastener, the problem of insufficient tensile strength of existing rivet nuts under high load conditions is solved, achieving a stable connection and anti-torsion capability, suitable for efficient fastening of thin plates and complex-shaped workpieces.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PEM CHINA
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-19
AI Technical Summary
Existing rivet nuts have insufficient tensile and shear strength under high load conditions, making them prone to loosening or damage. They are also poorly suited for thick materials and complex-shaped workpieces, and the installation quality is greatly affected by the operator's experience and the performance of the tools.
Design a rivet fastener that, through the interference fit and axial compression of the first and second workpieces, enables the guide section and expansion section of the first workpiece to form a stable connection with the bushing of the second workpiece. Combined with anti-rotation ribs and torque ribs, it prevents loosening and improves torsional resistance.
It achieves efficient and stable fastening, improves tensile and shear strength, prevents loosening and rotation, and is suitable for thin plates and complex-shaped workpieces. The installation process is simple and is not affected by the operator's experience or tool performance.
Smart Images
Figure CN224260693U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fastener technology, specifically to a rivet fastener and connection structure. Background Technology
[0002] A rivet nut is a type of internally threaded fastener specifically designed for fastening thin plates or pipes. It is achieved by using a special rivet tool to apply plastic deformation to the tail of the nut, forming a riveting flange on the back of the base material, thus achieving a reliable connection with the base material.
[0003] Existing rivet nuts typically consist of a threaded section, a deformed section, and a flange section. Depending on the application, they can be designed as cylindrical, semi-hexagonal, or fully hexagonal structures to improve their resistance to rotation. While rivet nuts offer advantages such as easy installation, quick operation, no tapping required, and suitability for blind holes, in practical applications, due to structural and material limitations, their tensile and shear strengths are insufficient for high-load applications. Especially under impact or vibration, the connection is prone to loosening or damage. Rivet nuts are more suitable for thin-plate structures; their applicability is poor for thicker materials, hard castings, complex-shaped workpieces, or high-strength connections. Furthermore, the installation quality is significantly affected by the operator's experience and tool performance. Utility Model Content
[0004] To overcome the above shortcomings, the purpose of this utility model is to provide a rivet fastener and connection structure, in which the first workpiece and the second workpiece form a stable connection through an interference fit, thereby ensuring that the rivet fastener and the plate can be firmly connected.
[0005] Technical solution: This utility model discloses a rivet fastener having a first end and a second end opposite each other along the axial direction, the rivet fastener comprising:
[0006] A first workpiece includes a guide section, the first end of which is an annular fixed post, the second end of which is an expansion section, the guide section is conical, the diameter of which gradually decreases from the second end to the first end, at least a portion of the diameter of the expansion section is greater than or equal to the diameter of the second end of the guide section, at least a portion of the diameter of the fixed post is less than or equal to the diameter of the first end of the guide section, and the first workpiece is provided with a riveting part along its axial direction.
[0007] The second workpiece includes a coaxially arranged annular bushing and a flange portion connected to a first end of the bushing, and the second workpiece has a first through hole extending through it along its axial direction.
[0008] The first through hole is used to accommodate the first workpiece, thereby allowing the first workpiece to be in an interference fit with the second workpiece.
[0009] Furthermore, the outer surface of the first workpiece has several circumferentially spaced anti-rotation ribs.
[0010] Furthermore, the outer wall surface of the second workpiece has several anti-rotation portions distributed circumferentially.
[0011] Furthermore, the diameter of the flange is larger than the outer diameter of the bushing, and a plurality of torque ribs are circumferentially spaced at the connection between the flange and the bushing, the torque ribs connecting the bushing and the flange.
[0012] Furthermore, the axial length of the first workpiece is the same as the axial length of the first through hole of the second workpiece.
[0013] Furthermore, the rivet part is an internal thread provided on the inner wall of the first workpiece.
[0014] Furthermore, the rivet part is a bolt connected to the fixing post.
[0015] This utility model also discloses a connection structure for a rivet fastener, including:
[0016] A rivet fastener having a first end and a second end opposite each other along an axial direction, comprising a first workpiece and a second workpiece;
[0017] The first workpiece includes a guide section, the first end of which is an annular fixed post, the second end of which is an expansion section, the guide section is tapered, the diameter of which gradually decreases from the second end to the first end, at least a portion of the diameter of the expansion section is greater than or equal to the diameter of the second end of the guide section, at least a portion of the diameter of the fixed post is less than or equal to the diameter of the first end of the guide section, and the first workpiece is provided with a riveting part along its axial direction.
[0018] The second workpiece includes a coaxially arranged annular bushing and a flange portion connected to a first end of the bushing, and the second workpiece has a first through hole extending through it along its axial direction;
[0019] Mounting plate, the mounting plate having a second through hole;
[0020] The bushing passes through the second through hole and the outer wall surface of the bushing contacts the inner wall surface of the second through hole. The flange portion contacts the end face of the mounting plate. The first workpiece is accommodated in the bushing. The first workpiece and the second workpiece are interference-fitted. The guide section and the expansion section axially compress the bushing, thereby causing the bushing to expand and deform, compressing the second through hole, so that the rivet fastener is securely connected to the mounting plate.
[0021] Furthermore, the outer surface of the first workpiece has a plurality of circumferentially spaced anti-rotation ribs, which abut against the inner wall of the bushing of the second workpiece.
[0022] The outer wall surface of the second workpiece has a plurality of anti-rotation parts distributed circumferentially, and the anti-rotation parts abut against the inner wall of the second through hole of the mounting plate;
[0023] A plurality of torque ribs are provided circumferentially at the connection between the flange portion and the bushing of the second workpiece, and the torque ribs connect the bushing and the flange portion.
[0024] Furthermore, the rivet part is an internal thread provided on the inner wall of the first workpiece.
[0025] Furthermore, the rivet part is a bolt connected to the fixing post.
[0026] The beneficial effects of this utility model are as follows:
[0027] (1) The guide section and expansion section of the first workpiece are integrated structures. The first workpiece is brought into the bushing by axial riveting, so that the bushing of the second workpiece undergoes radial expansion deformation to form a stable and tight connection.
[0028] (2) The first workpiece and the second workpiece are respectively provided with anti-rotation ribs and anti-rotation parts, so as to prevent the rivet fasteners from rotating and loosening relative to each other during use;
[0029] (3) A torque rib is provided between the flange and the bushing of the second workpiece, which not only improves the overall rigidity of the rivet fastener, but also improves the torsional resistance. Attached Figure Description
[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances. In the drawings:
[0031] Figure 1 This is a schematic diagram of the rivet fastener described in this utility model;
[0032] Figure 2 This is a half-sectional view of the rivet fastener described in this utility model;
[0033] Figure 3 This is a schematic diagram of the riveting assembly of the rivet fastener described in this utility model;
[0034] Figure 4 This is a half-sectional view of the rivet fastener described in this utility model;
[0035] Figure 5 This is a half-sectional view of another embodiment of the rivet fastener described in this utility model;
[0036] Figure 6 This is a schematic diagram of the connection structure of the rivet fastener described in this utility model;
[0037] Figure 7 This is a schematic diagram of the connection structure of the rivet fastener described in this utility model.
[0038] In the diagram: 11, First end; 12, Second end; 3, First workpiece; 31, Guide section; 32, Fixed column; 33, Expansion section; 34, Riveting part; 35, Anti-rotation rib; 4, Second workpiece; 41, Bushing; 411, First through hole; 412, Anti-rotation part; 42, Flange part; 421, Torque rib; 5, Mounting plate; 51, Second through hole. Detailed Implementation
[0039] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.
[0040] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The implementation methods of this utility model will now be described based on its overall structure.
[0041] like Figures 1 to 5 As shown, this utility model discloses a rivet fastener having a first end 11 and a second end 12 opposite each other along the axial direction. The rivet fastener includes:
[0042] The first workpiece 3 includes a guide section 31, the first end 11 of the guide section 31 is an annular fixing post 32, the second end 12 of the guide section 31 is an expansion section 33, the guide section 31 is conical, the diameter of the guide section 31 gradually decreases from the second end 12 to the first end 11, at least a portion of the diameter of the expansion section 33 is greater than or equal to the diameter of the second end 12 of the guide section 31, at least a portion of the diameter of the fixing post 32 is less than or equal to the diameter of the first end 11 of the guide section 31, and the first workpiece 3 is provided with a riveting part 34 along its axial direction;
[0043] The second workpiece 4 includes a coaxially arranged annular bushing 41 and a flange portion 42 connected to the first end 11 of the bushing 41. The second workpiece 4 has a first through hole 411 extending through it along its axial direction.
[0044] The inner diameter of the first through hole 411 is the same as the outer diameter of the fixed post 32. The bushing 41 is used to accommodate the first workpiece 3, so that the first workpiece 3 and the second workpiece 4 are interference-fitted.
[0045] With the above structure, the first workpiece 3 and the second workpiece 4 can achieve a highly efficient and stable fastening effect through their cooperation. The first workpiece 3 is an integral structure, with the end of the first end 11 being an annular fixing post 32 and the end of the second end 12 being an expansion section 33. A riveting structure is also provided on the first workpiece 3 along its axial direction, which facilitates the precise alignment and operation of the first workpiece 3 and the second workpiece 4 during assembly. The second workpiece 4 consists of a coaxial bushing 41 and a flange 42 connected to its end. The bushing 41 has an axially penetrating first through hole 411, the inner diameter of which is consistent with the outer diameter of the fixing post 32 of the first workpiece 3, ensuring that the two can form an interference fit during assembly. During installation, the first workpiece 3 is inserted into the first through hole 411 of the second workpiece 4, and force is applied by the riveting part 34. The first workpiece 3 and the second workpiece 4 are in an interference fit, so that the expansion section 33 and the guide section 31 press the bushing 41 perpendicularly to the axial direction, realizing the riveting and making the entire structure firmly connected.
[0046] Preferably, the guide section 31 is tapered, with the diameter of the second end 12 of the guide section 31 being larger than the diameter of the first end 11. The diameter of the first end 11 of the guide section 31 is greater than or equal to the outer diameter of the fixing post 32. This gradually increasing diameter structure of the guide section 31 guides the guide section 31 into the bushing 41 during riveting. The fixing post 32, as the part where the first workpiece 3 is first inserted into the first through hole 411 of the second workpiece 4, has a diameter that matches the inner diameter of the first through hole 411 of the second workpiece 4 to achieve an interference fit. The difference in outer diameter between the fixing post 32 and the first end 11 of the guide section 31 forms a gradually transitioning structure, which can play a guiding and deformation buffering role during the riveting process. When the first workpiece 3 is subjected to force through the riveting part 34, the expansion section 33 located at its second end 12 will deform under stress, thereby abutting against the bushing 41 of the second workpiece 4 to form a firm lock. Furthermore, the smooth connection between the guide section 31 and the expansion section 33, rather than the abrupt transition, optimizes the structural stress distribution and reduces the risk of material fatigue and fracture caused by structural abrupt changes.
[0047] Preferably, the outer surface of the first workpiece 3 is provided with several circumferentially spaced anti-rotation ribs 35, which enhance the positioning effect through friction when inserted into the second workpiece 4, thereby preventing the first workpiece 3 from rotating during use and significantly improving the anti-loosening performance of the rivet fastener under complex working conditions such as vibration and impact. The outer wall surface of the second workpiece 4 is provided with several circumferentially spaced anti-rotation parts 412. Preferably, the anti-rotation parts 412 can be tooth-like structures axially protruding relative to the outer wall surface of the second workpiece 4, or groove-like structures provided on the outer wall surface of the second workpiece 4. During assembly, the anti-rotation parts 412 engage with the inner wall of the mounting hole of the plate, forming a physical anti-rotation structure, further enhancing the stability of the second workpiece 4 in the assembly position. Even under large torque or vibration, it can effectively suppress rotation or loosening, which helps to improve the reliability and safety of the rivet fastener in long-term use. The diameter of the flange part 42 is larger than the outer diameter of the bushing 41, and several torque ribs 421 are provided at the connection. The flange 42 has a relatively large diameter, which not only serves to limit and tighten the parts but also provides a larger support surface, improving the uniformity of force distribution during riveting and preventing damage to the components due to excessive local stress. Several circumferentially distributed torque ribs 421 are provided in the connection area between the flange 42 and the bushing 41, thereby providing stronger torsional resistance between the flange 42 and the bushing 41 and preventing relative displacement or damage due to torsional load.
[0048] Furthermore, the axial length of the first workpiece 3 is the same as the axial length of the first through hole 411 of the second workpiece 4. When the axial length of the first workpiece 3 is the same as the length of the first through hole 411 of the second workpiece 4, the first workpiece 3 can be completely embedded inside the second workpiece 4 during assembly, thereby achieving complete fit and matching between the two in the axial direction, effectively avoiding positional displacement of the first workpiece 3 due to insufficient assembly or excessive insertion, and improving assembly accuracy.
[0049] like Figure 4 and Figure 5 As shown, in one feasible embodiment, the rivet part 34 is an internal thread provided on the inner wall of the first workpiece 3, enabling it to cooperate with a screw or rivet shank to form an internal thread rivet structure. In another feasible embodiment, the rivet part 34 is a bolt connected to the fixing post 32. Unlike the previous embodiment, the rivet part 34 is not located inside the first workpiece 3, but rather uses an external bolt connected to the fixing post 32 as a force transmission device. These two rivet methods provide different implementation paths, both offering greater structural flexibility and application breadth while ensuring stable fastener connection.
[0050] like Figures 1 to 7 As shown, this utility model also discloses a connection structure for a rivet fastener, comprising:
[0051] A rivet fastener, comprising a first workpiece 3 and a second workpiece 4;
[0052] The first workpiece 3 includes a guide section 31, which has a first end 11 and a second end 12 along its axial direction. The first end 11 of the guide section 31 is an annular fixing post 32, and the second end 12 of the guide section 31 is an expansion section 33. The guide section 31 is tapered, and the diameter of the guide section 31 gradually decreases from the second end 12 to the first end 11. At least a portion of the diameter of the expansion section 33 is greater than or equal to the diameter of the second end 12 of the guide section 31, and at least a portion of the diameter of the fixing post 32 is less than or equal to the diameter of the first end 11 of the guide section 31. The first workpiece 3 is provided with a riveting part 34 along its axial direction.
[0053] The second workpiece 4 includes a coaxially arranged annular bushing 41 and a flange portion 42 connected to the first end 11 of the bushing 41. The second workpiece 4 has a first through hole 411 extending through it along its axial direction.
[0054] Mounting plate 5, the mounting plate 5 having a second through hole 51;
[0055] The bushing 41 passes through the second through hole 51 and the outer wall surface of the bushing 41 contacts the inner wall surface of the second through hole 51. The flange portion 42 contacts the end face of the mounting plate 5. The first workpiece 3 is accommodated in the bushing 41. The first workpiece 3 and the second workpiece 4 are interference-fitted. The guide section 31 and the expansion section 33 axially compress the bushing 41, thereby causing the bushing 41 to expand and deform, compressing the second through hole 51, so that the rivet fastener is tightly connected to the mounting plate 5.
[0056] With the above structure, by setting a first workpiece 3 and a second workpiece 4, the first workpiece 3 includes a guide section 31, the first end 11 of which is an annular fixing post 32, and the second end 12 of which is an expansion section 33. The guide section 31 and the expansion section 33 are integrally formed with the guide section 31. At the same time, the first workpiece 3 is provided with a riveting part 34 in the axial direction, so that it has the ability to be riveted. The second workpiece 4 consists of a bushing 41 arranged coaxially and a flange part 42 connected to its first end 11. The bushing 41 is provided with a first through hole 411 that is axially penetrating, for accommodating the first workpiece 3 and forming an interference fit with it. The bushing 41 of the second workpiece 4 passes through the second through hole 51 of the mounting plate 5. The outer wall of the bushing 41 fits against the inner wall of the second through hole 51, and the flange part 42 contacts the surface of the mounting plate 5 to play a limiting role, forming a preliminary positioning and support structure. The first workpiece 3 is inserted into the bushing 41 and a pulling force is applied through the riveting part 34, so that the first workpiece 3 is riveted into the bushing 41 as a whole. Then, the guide section 31 and the expansion section 33 apply pressure to the bushing 41 in the axial direction, causing the bushing 41 to undergo radial expansion deformation, thereby firmly pressing the hole wall of the mounting plate 5 and realizing the fastening and locking of the overall structure.
[0057] The interference fit and axial compression between the first workpiece 3 and the second workpiece 4 cause the bushing 41 to expand, which not only simplifies the installation process and eliminates the need for support on the back of the mounting plate 5, but also provides reliable tensile and shear strength after installation. The flange 42 ensures axial restraint, preventing the bushing 41 from sliding outward and further enhancing the stability of the connection.
[0058] Preferably, the outer surface of the first workpiece 3 is provided with a plurality of anti-rotation ribs 35 spaced apart along the circumference, so that after it is inserted into the bushing 41 of the second workpiece 4, it abuts against its inner wall, thereby providing anti-rotation support in the radial and circumferential directions and preventing the first workpiece 3 from rotating relative to the bushing during riveting or use. Similarly, the anti-rotation part 412 provided on the outer wall of the second workpiece 4 contacts the inner wall of the second through hole 51 of the mounting plate 5, and the rotation of the second workpiece 4 relative to the mounting plate 5 is restricted by toothed interference, further improving the torque bearing capacity of the entire connection structure. Furthermore, a plurality of torque ribs 421 arranged at the connection between the flange part 42 and the bushing 41 firmly connect the two, preventing misalignment or rotation failure caused by deformation during riveting.
[0059] Furthermore, in one feasible embodiment, the riveting part 34 is an internal thread provided on the inner wall of the first workpiece 3, which facilitates the use of a rivet gun to achieve riveting drive and is suitable for automated assembly and fastening tasks with high precision requirements; in another feasible embodiment, the riveting part 34 is a bolt connected to the fixed post 32. By tightening the bolt, the first workpiece 3 is pulled, thereby driving the guide section 31 and the expansion section 33 into the bushing 41 to achieve axial compression and radial expansion, thereby completing a firm riveting.
[0060] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.
Claims
1. A rivet fastener, characterized in that, The rivet fastener, having a first end and a second end opposite each other along the axial direction, comprises: A first workpiece includes a guide section, the first end of which is an annular fixed post, the second end of which is an expansion section, the guide section is conical, the diameter of which gradually decreases from the second end to the first end, at least a portion of the diameter of the expansion section is greater than or equal to the diameter of the second end of the guide section, at least a portion of the diameter of the fixed post is less than or equal to the diameter of the first end of the guide section, and the first workpiece is provided with a riveting part along its axial direction. The second workpiece includes a coaxially arranged annular bushing and a flange portion connected to a first end of the bushing, and the second workpiece has a first through hole extending through it along its axial direction. The first through hole is used to accommodate the first workpiece, thereby allowing the first workpiece to be in an interference fit with the second workpiece.
2. The rivet fastener according to claim 1, characterized in that, The outer surface of the first workpiece has several anti-rotation ribs distributed circumferentially.
3. The rivet fastener according to claim 1, characterized in that, The outer wall surface of the second workpiece has several anti-rotation parts distributed circumferentially.
4. The rivet fastener according to claim 1, characterized in that, The diameter of the flange is larger than the outer diameter of the bushing. Several torque ribs are circumferentially spaced at the connection between the flange and the bushing, and the torque ribs connect the bushing and the flange.
5. The rivet fastener according to claim 1, characterized in that, The axial length of the first workpiece is the same as the axial length of the first through hole of the second workpiece.
6. The rivet fastener according to claim 1, characterized in that, The rivet part is an internal thread provided on the inner wall of the first workpiece.
7. The rivet fastener according to claim 1, characterized in that, The rivet part is a bolt that connects to the fixed column.
8. A connection structure for a rivet fastener, characterized in that, include: A rivet fastener having a first end and a second end opposite each other along an axial direction, comprising a first workpiece and a second workpiece; The first workpiece includes a guide section, the first end of which is an annular fixed post, the second end of which is an expansion section, the guide section is tapered, the diameter of which gradually decreases from the second end to the first end, at least a portion of the diameter of the expansion section is greater than or equal to the diameter of the second end of the guide section, at least a portion of the diameter of the fixed post is less than or equal to the diameter of the first end of the guide section, and the first workpiece is provided with a riveting part along its axial direction. The second workpiece includes a coaxially arranged annular bushing and a flange portion connected to a first end of the bushing, and the second workpiece has a first through hole extending through it along its axial direction; Mounting plate, the mounting plate having a second through hole; The bushing passes through the second through hole and the outer wall surface of the bushing contacts the inner wall surface of the second through hole. The flange portion contacts the end face of the mounting plate. The first workpiece is accommodated in the bushing. The first workpiece and the second workpiece are interference-fitted. The guide section and the expansion section axially compress the bushing, thereby causing the bushing to expand and deform, compressing the second through hole, so that the rivet fastener is securely connected to the mounting plate.
9. The connection structure of the rivet fastener according to claim 8, characterized in that, The outer surface of the first workpiece has a plurality of circumferentially spaced anti-rotation ribs, which abut against the inner wall of the bushing of the second workpiece; The outer wall surface of the second workpiece has a plurality of anti-rotation parts distributed circumferentially, and the anti-rotation parts abut against the inner wall of the second through hole of the mounting plate; A plurality of torque ribs are provided circumferentially at the connection between the flange portion and the bushing of the second workpiece, and the torque ribs connect the bushing and the flange portion.
10. The connection structure of the rivet fastener according to claim 8, characterized in that, The rivet part is an internal thread provided on the inner wall of the first workpiece.
11. The connection structure of the rivet fastener according to claim 8, characterized in that, The rivet part is a bolt that connects to the fixed column.