A new type of self-piercing rivet

Abstract

This utility model discloses a novel self-piercing rivet, comprising a rivet shank, a rivet head at the top of the rivet shank, a threaded portion at the bottom of the rivet shank, and a sharp end at the bottom of the threaded portion. A retaining ring mechanism for riveting positioning is sleeved on the rivet shank. The retaining ring mechanism is axially limited by an expansion structure with the rivet shank. The retaining ring mechanism includes a sleeve, with a fixing ring and a bearing ring respectively provided at both ends. This utility model has a scientifically sound and reasonable structural design. Through the expansion fit between the retaining ring mechanism and the rivet shank, and the separation groove structure of the bearing ring, it achieves precise riveting positioning and adaptability to various plate thicknesses, solving the problem of inaccurate positioning. Through the interference fit between the reinforcing ring and the sleeve, and the double fixing of the snap-fit ​​groove, it enhances the rigidity of the retaining ring mechanism and prevents loosening, solving the problem of easy deformation of the retaining ring.

Description

Technical Field

[0001] This utility model relates to the field of rivet technology, and in particular to a novel self-piercing rivet. Background Technology

[0002] Self-piercing rivets are fasteners used for joining sheet metal parts. They eliminate the need for pre-punching holes in the connected parts, using the rivet's sharp structure to pierce the sheet metal and create a mechanical engagement. They are widely used in lightweight assembly fields such as automobiles and home appliances. However, existing self-piercing rivets have two main problems: first, the lack of an effective positioning mechanism during riveting makes them prone to over-piercing or misalignment, leading to unstable connection strength; second, the retaining ring structure lacks rigidity, making it susceptible to deformation under long-term stress, thus affecting the overall service life of the rivet. Therefore, we propose a new type of self-piercing rivet. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a novel self-piercing rivet. This invention solves the problems mentioned in the background section.

[0004] This utility model provides the following technical solution: a novel self-piercing rivet, comprising a rivet shank, a rivet head at the top of the rivet shank, a threaded portion at the bottom of the rivet shank, a sharp end at the bottom of the threaded portion, and a retaining ring mechanism for riveting positioning sleeved on the rivet shank. The retaining ring mechanism is axially limited and fitted with the rivet shank through an expansion structure. The retaining ring mechanism includes a sleeve, with a fixing ring and a bearing ring respectively provided at both ends of the sleeve. Multiple separation grooves are equally spaced along the outer side of the bearing ring, and a reinforcing ring is interference-fitted onto the outer side of the sleeve.

[0005] In the above scheme, the rivet rod, rivet head and threaded part are integrally formed.

[0006] In the above scheme, the retaining ring mechanism and the rivet rod are connected by an expansion joint.

[0007] In the above solution, the lower edge of the rivet cap is rounded.

[0008] In the above solution, a mounting plate is provided above the rivet head, and a connecting groove is provided on the mounting plate.

[0009] In the above scheme, a buckle is evenly provided on the inner side of the reinforcing ring along the circumferential direction, and a slot corresponding to the buckle is opened on the outer side of the rivet rod.

[0010] In the above scheme, the retaining ring mechanism is an integrally formed steel component.

[0011] The advantages and beneficial effects of this utility model are as follows: This utility model provides a novel self-piercing rivet, which achieves precise riveting positioning and adaptability to plates of various thicknesses through the expansion and tightening fit between the retaining ring mechanism and the rivet rod, as well as the separation groove structure of the bearing ring, thus solving the problem of inaccurate positioning; through the interference fit between the reinforcing ring and the sleeve and the double fixing of the snap-fit ​​groove, the rigidity of the retaining ring mechanism is enhanced and loosening is prevented, thus solving the problem of easy deformation of the retaining ring; through the integrated molding of the rivet rod, rivet head and threaded part, the overall mechanical performance is improved, thus solving the problem of poor reliability of the split structure. Attached Figure Description

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Figure 1 This is a schematic diagram of the connection structure of this utility model; Figure 2 This is a schematic diagram of the rivet rod structure of this utility model; Figure 3 This is a top view of the retaining ring mechanism of this utility model.

[0014] In the figure: 1. Rivet rod 11. Rivet head 12. Threaded part 13. Sharp end 14. Retaining ring mechanism 141. Sleeve 142. Fixing ring 143. Pressure bearing ring 144. Separation groove 15. Mounting plate 151. Connecting groove 16. Reinforcing ring 17. Buckle 18. Snap groove. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0016] like Figure 1-3As shown, this utility model is a novel self-piercing rivet, including a rivet rod 1, a rivet head 11 at the top of the rivet rod 1, a threaded portion 12 at the bottom of the rivet rod 1, a sharp end 13 at the bottom of the threaded portion 12, and a retaining ring mechanism 14 for riveting positioning sleeved on the rivet rod 1. The retaining ring mechanism 14 is axially limited and cooperates with the rivet rod 1 through an expansion structure. The retaining ring mechanism 14 includes a sleeve 141, with a fixing ring 142 and a bearing ring 143 respectively provided at both ends of the sleeve 141. Multiple separation grooves 144 are equally spaced along the outer side of the bearing ring 143. A reinforcing ring 16 is interference-fitted onto the outer side of the sleeve 141. By using the expansion fit between the retaining ring mechanism 14 and the rivet rod 1, and the separation groove 144 structure of the pressure ring 143, precise riveting positioning and adaptation to multiple thickness plates are achieved, solving the problem of inaccurate positioning. By using the interference fit between the reinforcing ring 16 and the sleeve 141, and the double fixing of the buckle 17-slot 18, the rigidity of the retaining ring mechanism is enhanced and loosening is prevented, solving the problem of easy deformation of the retaining ring. By using the integral molding of the rivet rod 1, rivet head 11 and threaded part 12, the overall mechanical performance is improved, solving the problem of poor reliability of the split structure. By using the mounting plate 15 and the connecting groove 151, rapid assembly and positioning are achieved, solving the problem of installation alignment.

[0017] The rivet rod 1 is the core load-bearing structure. The top rivet cap 11 restricts the axial displacement of the rivet, the lower threaded part 12 enhances the engagement depth with the sheet metal, and the bottom sharp end 13 reduces piercing resistance, facilitating rapid penetration of multi-layer sheet metal. The retaining ring mechanism 14, through its expansion structure, cooperates with the rivet rod 1 to achieve precise axial positioning during riveting, preventing excessive rivet penetration. The fixing ring 142 and bearing ring 143 at both ends of the sleeve 141 are used to fix the position of the retaining ring and bear the riveting pressure, respectively. The separation groove 144 allows the bearing ring 143 to elastically deform to adapt to sheet metal of different thicknesses, improving adaptability. The reinforcing ring 16 is interference-fitted with the sleeve 141, significantly enhancing the rigidity of the sleeve 141 and preventing long-term deformation under stress. Through the above structural cooperation, the riveting positioning is accurate, adaptable, and durable, solving the problems of inaccurate rivet positioning and easy deformation of the retaining ring in existing systems.

[0018] In the above solution, the rivet rod 1, rivet head 11, and threaded portion 12 are integrally formed. Using an integral forming process to manufacture the rivet rod 1, rivet head 11, and threaded portion 12 reduces assembly steps and avoids gaps in the connection of separate structures. Through the integral forming structure, the overall mechanical properties of the rivet are improved, ensuring uniform force transmission during riveting and solving the problem of poor reliability in connections of separate structures.

[0019] In the above solution, the retaining ring mechanism 14 and the rivet rod 1 are connected by an expansion joint. The expansion joint is achieved through an interference fit between the inner wall of the retaining ring mechanism 14 and the outer wall of the rivet rod 1, without the need for additional fasteners. This expansion joint ensures a stable connection between the retaining ring mechanism 14 and the rivet rod 1, while also facilitating adjustments to the retaining ring position as needed, thus solving the problems of inconvenient installation and disassembly and easy displacement of the retaining ring.

[0020] In the above solution, the lower edge of the rivet head 11 is rounded. The rounded corner of the lower edge of the rivet head 11 is processed by chamfering, eliminating sharp edges. The rounded corner structure avoids scratching the surface of the connected parts or the operator's hands during riveting, while reducing stress concentration, improving the crack resistance of the rivet head 11, and solving the problems of sharp edges easily damaging the sheet metal and posing safety hazards.

[0021] In the above solution, a mounting plate 15 is provided above the rivet head 11, and a connecting groove 151 is formed on the mounting plate 15. The mounting plate 15 and the rivet head 11 are formed simultaneously, and the connecting groove 151 is used to cooperate with external positioning fixtures or connectors. By cooperating with the mounting plate 15 and the connecting groove 151, quick alignment during rivet installation is achieved, improving assembly efficiency. At the same time, it can assist in fixing external components, expanding the function of the rivet, and solving the problem of difficult positioning during installation.

[0022] In the above scheme, 3-4 snap fasteners 17 are evenly arranged circumferentially on the inner side of the reinforcing ring 16, and slots 18 corresponding to the snap fasteners 17 are opened on the outer side of the rivet rod 1. The snap fastener 17 is an elastic protrusion integrally formed on the inner side of the reinforcing ring 16, and the slot 18 is an annular groove opened on the outer wall of the rivet rod 1, and the two form a snap-fit ​​fit. Through the one-to-one correspondence between the snap fasteners 17 and the slots 18, the reinforcing ring 16 is double-fixed, further preventing the axial movement of the reinforcing ring 16 and solving the problem of easy loosening after long-term use of a single interference fit.

[0023] In the above solution, the retaining ring mechanism 14 is a one-piece steel component. The retaining ring mechanism 14 is integrally stamped from No. 45 steel, which has high strength and hardness. The one-piece steel component design ensures uniform stress distribution across all parts of the retaining ring mechanism 14, improving its wear resistance and deformation resistance, and solving the problem of insufficient material strength in the retaining ring mechanism.

[0024] Working principle: This novel self-piercing rivet, during riveting operations, first aligns the rivet with the tooling via the connecting groove 151 on the mounting plate 15, ensuring the rivet axis is perpendicular to the connected parts. Then, the riveting equipment is started, and the sharp end 13 at the bottom of the rivet rod 1 pierces through multiple layers of sheet metal under pressure. As the rivet continues to descend, the pressure ring 143 of the retaining ring mechanism 14 contacts the sheet metal surface and bears the reaction force. The separating groove 144 causes the pressure ring 143 to undergo adaptive elastic deformation according to the sheet metal thickness, while the fixing ring 142 and the rivet rod 1 tighten together. The retaining ring mechanism 14 continues to descend, achieving precise control over the rivet insertion depth. After the sharp end 13 completely penetrates the plate, the threaded part 12 at the lower part of the rivet rod 1 mechanically engages with the plate, enhancing the connection strength. During this process, the reinforcing ring 16 maintains the rigidity of the sleeve 141 through interference fit and snap-fit ​​17-slot 18, preventing deformation of the retaining ring mechanism 14. After riveting, the rounded corner structure of the rivet head 11 protects the plate surface, and the mounting plate 15 can further assist in fixing external components, completing the entire connection process.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel self-piercing rivet, comprising a rivet shank (1), characterized in that: The rivet rod (1) is provided with a rivet cap (11) at the top and a threaded part (12) at the bottom. The threaded part (12) is provided with a sharp end (13) at the bottom. A retaining ring mechanism (14) for riveting positioning is sleeved on the rivet rod (1). The retaining ring mechanism (14) is axially limited and cooperated with the rivet rod (1) through a tightening structure. The retaining ring mechanism (14) includes a sleeve (141). A fixing ring (142) and a pressure ring (143) are respectively provided at both ends of the sleeve (141). Multiple separation grooves (144) are equally spaced along the outer side of the pressure ring (143). A reinforcing ring (16) is interference-fitted on the outer side of the sleeve (141).

2. A new self-piercing rivet according to claim 1, characterized in that The rivet rod (1), rivet cap (11) and threaded part (12) are integrally formed.

3. A new self-piercing rivet according to claim 1, characterized in that, The retaining ring mechanism (14) is tightened to connect with the rivet rod (1).

4. A new self-piercing rivet according to claim 1, characterized in that, The lower edge of the rivet cap (11) is rounded.

5. A new self-piercing rivet according to claim 1, characterized in that, A mounting plate (15) is provided above the rivet cap (11), and a connecting groove (151) is provided on the mounting plate (15).

6. A new self-piercing rivet according to claim 1, characterized in that, The inner side of the reinforcing ring (16) is evenly provided with 3-4 buckles (17) along the circumference, and the outer side of the rivet rod (1) is provided with a slot (18) corresponding to the buckle (17).

7. A new self-piercing rivet according to claim 1, characterized in that, The retaining ring mechanism (14) is an integrally formed steel component.

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