Pull rivet and pull rivet connecting assembly thereof

Abstract

The utility model discloses a pull rivet and a pull rivet connecting component thereof, the pull rivet is arranged in a lantern ring in a penetrating manner, the pull rivet comprises a rivet head part, a locking part and a rivet rod part which are sequentially arranged along the axial direction, a self-locking groove structure is arranged on the locking part, and meanwhile, a pull rivet groove structure matched with a pull rivet tool is arranged on the peripheral wall of the rivet rod part. During rivet pulling operation, the self-locking groove structure is configured to enable a lantern ring end material matched with the self-locking groove structure to generate plastic deformation under axial pressure and to be embedded into the self-locking groove structure, so that a firm mechanical embedded anti-loosening structure is formed between the rivet and the lantern ring end. By the adoption of the structural design, the lantern ring deformation material and the inner wall of the self-locking groove form circumferential continuous meshing, the stable supporting state is maintained, the anti-fatigue and anti-tearing capacity of the head of the lantern ring is improved, and the anti-loosening reliability, the anti-vibration performance and the overall structural strength of rivet pulling connection are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of fastener riveting technology, and more specifically to a rivet and its riveting connection assembly. Background Technology

[0002] Riveting, as an important mechanical fastening method, is widely used in aerospace, rail transportation, automobile manufacturing, building structures, and industrial equipment, especially suitable for enclosed or semi-enclosed structures that can only be installed from one side. Its basic principle is: by applying axial tension to the rivet using a specialized riveting tool, the collar undergoes plastic deformation on the rivet shank, thereby achieving a reliable fastening of two or more connected parts.

[0003] A common type of riveting structure mainly consists of two parts: a rivet and a collar. The collar is typically a straight cylindrical structure with a tool-fitting step at one end. During installation, the riveting tool applies axial tension to the rivet shank, causing the collar to move along the rivet shank and undergo radial plastic deformation under pressure. Ultimately, the collar cylinder is pressed tightly against the smooth section of the rivet shank, and its head end face is pressed against the surface of the connected parts, thus achieving a tight connection. However, in practical applications and long-term practice, this type of riveting connector still has the following shortcomings: the collar lacks structural pre-guidance and constraint on the direction of material flow during riveting; the collar head is prone to failing to support the rivet head cap during riveting and then coming out of the rivet shank, which may lead to the collar head area being prone to outward flipping or loosening during stress, affecting the clamping effect and connection quality. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the head of the collar in the prior art is prone to failing to support the head cap of the rivet during the riveting process, which leads to the risk of the collar head area turning outward or loosening during the stress process.

[0005] To address the aforementioned problems, this utility model provides a rivet that is fitted into a collar. It includes a rivet head, a locking portion, and a rivet shank, arranged sequentially along its axial direction. The locking portion has a self-locking groove structure located between the rivet head and the rivet shank. The outer peripheral wall of the rivet shank has a rivet groove structure for engaging with a rivet tool. The self-locking groove structure is configured such that during the rivet riveting operation, the material at the end of the collar, which is compatible with it, is compressed and deformed to embed into the self-locking groove structure, thereby forming a locking and anti-loosening structure between the rivet and the end of the collar.

[0006] In the aforementioned rivet, the self-locking groove structure is a multi-ring groove structure composed of multiple annular grooves spaced axially on the outer peripheral wall of the locking part, and multiple annular inclined bosses are formed between the multiple annular grooves.

[0007] In the aforementioned rivet, the self-locking groove structure is a conical groove structure formed on the outer peripheral wall of the locking part, and the groove wall of the conical groove structure is a conical inclined surface arranged around the circumference of the locking part.

[0008] In the aforementioned rivets, the self-locking groove structure is a groove structure formed on the outer peripheral wall of the locking part with a rectangular cross-section.

[0009] In the aforementioned rivets, the ratio of the diameter ØdC of the rivet shank to the minimum inner diameter Ød0 of the self-locking groove structure satisfies: ØdC / Ød0 = 0.9~1.2.

[0010] In the aforementioned rivet, the shank portion includes a threaded section, an upper shank section and a lower shank section connected to both ends of the threaded section. The upper shank section connects to the locking part, which is a columnar solid section connecting the rivet head and the rivet shank portion. The outer peripheral wall of the lower shank section is provided with a rivet groove structure extending circumferentially therefrom. The cross-sectional structure of the rivet groove structure includes a first inclined surface, a second plane and a third inclined surface that are continuously connected.

[0011] In the aforementioned rivet, the shank portion further includes a rivet limiting end disposed at one end of the lower shank section and adjacent to the rivet groove structure, wherein the rivet limiting end has a vertical bearing surface formed on the side facing the rivet groove structure.

[0012] This utility model also provides a riveting connection assembly, including a collar and a rivet as described above, wherein the collar is used to be installed in the connection hole of the connected parts, and the rivet applies axial pressure to the collar during the riveting operation.

[0013] In the above-mentioned riveting connection assembly, the sleeve has a pre-formed annular protrusion structure extending circumferentially on its cylindrical wall. When the sleeve is subjected to axial compression during the riveting process of the rivet, the annular protrusion structure undergoes radial plastic deformation in a preset direction before other parts of the sleeve's cylindrical wall, thereby forming a drum-shaped locking structure that is fastened between the head of the rivet and the connected parts.

[0014] In the aforementioned riveting connection assembly, the collar includes a limiting section and an extending main body section coaxially arranged. The outer peripheral wall of the extending main body section is provided with a pre-formed annular protrusion structure, which is continuously annular or spaced along the circumference of the extending main body section.

[0015] The technical solution of this utility model has the following advantages compared with the prior art:

[0016] 1. The rivet provided by this utility model adopts a three-section layout of rivet head, locking part, and rivet shank connected axially in sequence, realizing functional division of support, locking, and riveting. By providing a self-locking groove structure on the locking part and a rivet groove structure on the rivet shank, the rivet groove structure provides a precise force support point for the riveting tool, avoiding slippage or deviation of the tool during riveting and ensuring stable transmission of tension along the rivet axis. Furthermore, the self-locking groove structure provides a clear embedding position and guide for the plastic deformation of the collar end material, which is beneficial for guiding the collar end material into the self-locking groove during riveting. The rigid interlocking connection is achieved through a mechanical interlocking anti-loosening structure, which integrates the collar and rivet into a single connection. This structural design ensures that the collar's variable material and the inner wall of the self-locking groove form a continuous circumferential engagement and radial interference fit, guaranteeing that the collar head is always coaxially and closely fitted with the rivet head, maintaining a stable support state and greatly enhancing the resistance to axial pull-out. Structurally, it eliminates the possibility of the collar head flipping out or loosening and failing. When the collar head is under stress, the load is transferred to the self-locking groove structure through the anti-loosening structure, and the stress is shared by the rivet shank, improving the collar head's fatigue and tear resistance. This achieves anti-flipping, anti-loosening, high reliability, and long service life in the riveted connection.

[0017] 2. The self-locking groove structure of the rivet provided by this utility model adopts a multi-ring groove structure design. During the riveting operation, mechanical engagement is achieved by the plastic embedding of the collar material into multiple ring grooves. The inclined boss can guide the deformed material of the collar to the bottom of the ring groove more smoothly, reducing flow resistance and ensuring full filling. This forms a series of discrete mechanical interlocking points in the axial direction. Multiple locking points allow the working load after riveting to be more evenly distributed along the axial direction to the contact surface of each ring groove, avoiding excessive stress concentration at a single location. This significantly improves the fatigue strength and long-term reliability of the connection structure under dynamic load or vibration environment, and enhances the ability to resist pull-out and prevent loosening. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 A schematic diagram of the installation structure of the rivet provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the first embodiment of the self-locking groove structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the second embodiment of the self-locking groove structure of this utility model;

[0022] Figure 4This is a schematic diagram of the third embodiment of the self-locking groove structure of this utility model;

[0023] Figure 5 This is a structural schematic diagram of the riveting connection assembly provided by this utility model;

[0024] Figure 6 This is a schematic diagram of the riveting connection assembly of this utility model after riveting is completed.

[0025] Explanation of reference numerals in the attached drawings: 1. Rivet; 11. Rivet head; 12. Locking part; 13. Rivet shank; 131. Threaded section; 132. Plain section; 133. Rivet limiting end; 134. Vertical bearing surface; 2. Collar; 21. Extended main body section; 22. Limiting section; 23. Limiting step; 3. Annular protrusion structure; 4. Drum-shaped locking structure; 5. Self-locking groove structure; 51. Ring groove structure; 52. Conical groove structure; 53. Groove structure; 6. Rivet groove structure; 7. Connected part. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of 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.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example 1

[0030] This embodiment provides, as follows: Figures 1-6The aforementioned rivet, which is fitted into a collar 2, includes a rivet head 11, a locking part 12, and a rivet shank 13 arranged sequentially along its axial direction. The locking part 12 is provided with a self-locking groove structure 5 located between the rivet head 11 and the rivet shank 13. The outer peripheral wall of the rivet shank 13 is provided with a rivet groove structure 6 for cooperating with a rivet tool. The self-locking groove structure 5 is configured such that when the rivet 1 is riveted, the material of the collar end that is adapted to it is compressed and deformed into the self-locking groove structure 5, thereby forming an interlocking and anti-loosening structure between the rivet 1 and the end of the collar 2.

[0031] The above-described implementation method is the core technical solution of this embodiment. Based on the three-section layout of the rivet 1—comprising the rivet head, locking part, and rivet shank—connected axially in sequence, it achieves functional zoning for support, locking, and riveting. By providing a self-locking groove structure 5 on the locking part 12 and a riveting groove structure 6 on the rivet shank 13, the riveting groove structure provides a precise force support point for the riveting tool, preventing slippage or deviation during riveting and ensuring stable transmission of tension along the rivet axis. Furthermore, the self-locking groove structure 5 provides a clear embedding position and guide for the plastic deformation of the collar end material, facilitating the embedding of the collar end material into the self-locking groove during riveting. The internal rigid interlocking connection forms a mechanically interlocked fit. The anti-loosening structure makes the collar 2 and the rivet 1 form an integrated connection. This structural design makes the collar's variable material form a continuous circumferential engagement and radial interference fit with the inner wall of the self-locking groove, ensuring that the head of the collar 2 is always coaxially attached to the rivet head 11, maintaining a stable support state, greatly enhancing the resistance to axial pull-out, and structurally eliminating the risk of the collar head flipping out or loosening and failing. When the collar head is under force, the load is transferred to the self-locking groove structure through the anti-loosening structure, and the stress is shared by the rivet shank, improving the fatigue resistance and tear resistance of the collar head, and realizing the anti-flipping, anti-loosening, high reliability and long service life of the riveted connection.

[0032] The following is combined with Figures 1-4 The specific configuration of the self-locking groove structure is described in detail below:

[0033] As a first preferred embodiment, refer to Figure 2The self-locking groove structure 5 is a multi-ring groove structure 51 composed of multiple annular grooves spaced axially on the outer peripheral wall of the locking part 12, and multiple annular inclined bosses are formed between the multiple annular grooves. With this structure, the self-locking groove structure 5 adopts a multi-ring groove design. During riveting operations, mechanical engagement is achieved by the plastic embedding of the collar material into multiple annular grooves. The inclined bosses can more smoothly guide the deformed material of the collar to the bottom of the annular grooves, reducing flow resistance and ensuring full filling. This forms a series of discrete mechanical interlocking points axially. Multiple locking points allow the working load after riveting to be more evenly distributed axially to the contact surface of each annular groove, avoiding excessive stress concentration at a single location. This significantly improves the fatigue strength and long-term reliability of the connection structure under dynamic loads or vibration environments, and enhances its pull-out resistance and anti-loosening ability.

[0034] As a second preferred embodiment, refer to Figure 3 The self-locking groove structure 5 is a conical groove structure 52 formed on the outer peripheral wall of the locking part 12. The groove wall of the conical groove structure 52 is a conical inclined surface arranged around the circumference of the locking part 12. This self-locking groove structure 5 adopts a conical groove structure design. Through the self-guiding effect of the conical inclined surface, the collar material can flow into the groove quickly and evenly along the inclined surface, reducing the force output requirements of the riveting tool and improving the convenience and efficiency of assembly. After riveting and fitting, the conical groove wall and the collar material will generate radial preload through the contact of the conical inclined surface, making the collar and rivet fit more tightly, increasing frictional resistance, further suppressing axial loosening and radial displacement, and significantly improving the tensile strength of the connection.

[0035] As a third preferred embodiment, refer to Figure 4 The self-locking groove structure 5 is a groove structure 53 formed on the outer peripheral wall of the locking part 12 with a rectangular cross-section. This self-locking groove structure 5 adopts a rectangular groove structure design, which has a large contact area of ​​the mating surface. The vertical groove wall of the groove structure forms a rigid axial stop on the collar material, which has a stronger ability to resist shear loads. It can withstand greater lateral shear force and axial pull-out force, improve locking strength, and maintain the advantage of high pull-out force.

[0036] According to the above-described arrangement of the self-locking groove structure 5, the ratio of the diameter ØdC of the shank portion 13 of the rivet 1 to the minimum inner diameter Ød0 of the self-locking groove structure 5 satisfies: ØdC / Ød0 = 0.9~1.2. This design is beneficial for controlling the interference after the collar material is plastically embedded, forming a slight interference fit to enhance the tightness of the fit, while preventing cracking or plastic instability of the self-locking groove wall or collar material due to excessive interference. Those skilled in the art can select the specific structure of the self-locking groove structure based on the above description, and other equivalent embodiments will not be described in detail here.

[0037] Next, let's combine... Figures 1-2The specific structure of the rivet is described in detail below:

[0038] The rivet shank 13 includes a threaded section 131 and two smooth sections 132 connected to both ends of the threaded section 131. One of the smooth sections 132 is connected to the locking part 12, which is a columnar solid section connecting the rivet head 11 and the rivet shank 13. The other smooth section 132 has a rivet groove structure 6 extending circumferentially on its outer peripheral wall. The cross-sectional structure of the rivet groove structure includes a first inclined surface, a second plane, and a third inclined surface that are continuously connected. The first inclined surface and the third inclined surface are respectively set at an angle to the axis of the rivet. The second plane is set parallel to the axis of the rivet. More preferably, the rivet shank 13 also includes a rivet limiting end 133 adjacent to the rivet groove structure 6 and set at one end of the smooth section 132. The rivet limiting end 133 has a vertical bearing surface 134 on the side facing the rivet groove structure 6. The three inclined surfaces extend to connect the vertical bearing surface 134. In this structural configuration, the first inclined surface connects to the outer peripheral wall of the smooth rod section. During riveting operations, the clamps of the riveting tool hook into the riveting groove structure 6 and fit against the vertical bearing surface 134. This ensures that the axial tensile force generated by the clamps during riveting is mainly directly applied to the vertical bearing surface 134 and the third inclined surface. This vertical bearing surface 134 ensures efficient transmission of tensile force along the axial direction, reduces energy loss caused by component forces, avoids the large radial component force generated by the curvature of existing arc surface structures, and reduces residual radial component force by using the third inclined surface at a specific angle. It can also eliminate stress concentration during riveting, thereby significantly reducing the crushing and strength weakening of the rivet tail material caused by radial force, significantly reducing friction and clamp wear, optimizing force distribution, avoiding stress concentration, and improving tool life and riveting stability.

[0039] Example 2

[0040] This embodiment provides, as follows: Figures 1-6The riveting connection assembly shown includes a collar 2 and a rivet 1 as described in Embodiment 1. The collar 2 is used to be installed in the connection hole of the connected part 7. The rivet 1 applies axial pressure to the collar 2 during the riveting operation. The connected part 7 can be a plate, profile, thin-walled component, or other structure used for riveting connection. More preferably, the collar 2 has a pre-formed annular protrusion structure 3 extending circumferentially on its cylindrical wall. When the collar 2 is subjected to axial compression during the riveting process of the rivet 1, the annular protrusion structure 3 undergoes radial plastic deformation in a preset direction before other cylindrical wall parts of the collar 2, thereby forming a drum-shaped locking structure 4 that is fastened between the head of the rivet 1 and the connected part 7. The advantage of this design is that the annular protrusion structure 3 forms a clear deformation guiding structure on the collar, allowing it to preferentially undergo radial plastic deformation during the riveting process. This results in a structurally stable drum-shaped locking part 12, which can evenly fill the gap between the head of the rivet 1 and the connected part 7, improving the vibration resistance and loosening resistance of the connected parts. The collar 2 using this technical solution reduces the deformation resistance in this area through the pre-formed annular protrusion structure design, ensuring that the radial plastic deformation is evenly spread along the circumference of the collar, greatly improving the controllability and predictability of the deformation process. This results in a full and sufficient drum-shaped locking structure, avoiding the risk of locking failure due to insufficient deformation. This design maintains the consistency, reliability, and convenience of the riveting connection, has a simple structure, reduces the difficulty of operation, and significantly improves the pull-out resistance and shear strength of the connection, making it suitable for applications with high reliability requirements.

[0041] In a further preferred configuration, the collar 2 includes a limiting segment 22 and an extending main body segment 21 coaxially arranged, and a limiting step 23 formed between the limiting segment 22 and the extending main body segment 21. The limiting segment 22 fits against one side of the connected member 7 through the limiting step 23. The extending main body segment 21 passes through the connecting hole of the connected member 7. The outer peripheral wall of the extending main body segment 21 is provided with a pre-formed annular protrusion structure 3. The annular protrusion structure 3 is continuously annular or spaced along the circumference of the extending main body segment 21. In this structural configuration, the limiting section 22 of the collar and the deformed locking structure abut against the two end faces of the connected part 7 respectively, forming a double-sided axial clamping, eliminating the axial fit gap between the collar 2 and the connected part 7, and avoiding axial movement and loosening during use. According to the synchronous radial contraction of the collar ring, it tightly hugs the rivet rod in its hole, forming a radial interference constraint. Combined with the axial clamping effect of the collar 2 on the connected part, a dual anti-loosening structure of axial locking and radial clamping is formed, which greatly improves the connection pair's resistance to axial pull-out, circumferential torsion, and vibration loosening.

[0042] The riveting assembly of this embodiment is used for single-sided fastening of sheet metal, profiles, or thin-walled components. The riveting process is as follows: The rivet 1 and collar 2 are combined to form the riveting assembly, which is then passed through the connecting hole of the connected component 7. The limiting section 22 of the collar 2 fits against one side of the connected component 7. Then, a riveting tool clamps the rivet 1 in the riveting groove and applies axial tension. Under the combined action of radial limiting and axial pressure, the annular protrusion 3 forms a drum-shaped locking structure 4 that is fastened between the rivet head and the connected component. Simultaneously, the end of the collar plastically deforms during the riveting process and engages with the self-locking groove structure 5 of the rivet, thus completing the anti-loosening fastening installation of the connected component 7. This installation design only requires clamping and applying force on one side of the connected component 7, eliminating the need for nuts or reserved operating space on the other side of the component. It is well-suited for assembly scenarios involving enclosed cavities and single-sided construction.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A rivet, fitted into a collar (2), characterized in that: The rivet (1) includes a head (11), a locking part (12), and a shank (13) arranged sequentially along its axial direction. The locking part (12) is provided with a self-locking groove structure (5) located between the head (11) and the shank (13). The outer peripheral wall of the shank (13) is provided with a rivet groove structure (6) for cooperating with a rivet tool. The self-locking groove structure (5) is configured such that when the rivet (1) is riveted, the material of the collar end that is adapted to it is deformed by pressure and embedded in the self-locking groove structure (5), thereby forming an interlocking and anti-loosening structure between the rivet (1) and the collar (2).

2. The rivet according to claim 1, characterized in that: The self-locking groove structure (5) is a multi-ring groove structure (51) consisting of multiple annular grooves spaced axially on the outer peripheral wall of the locking part (12), and multiple annular inclined bosses are formed between the multiple annular grooves.

3. A rivet according to claim 1, characterized in that: The self-locking groove structure (5) is a conical groove structure (52) formed on the outer peripheral wall of the locking part (12), and the groove wall of the conical groove structure (52) is a conical inclined surface arranged around the locking part (12).

4. A rivet according to claim 1, characterized in that: The self-locking groove structure (5) is a groove structure (53) formed on the outer peripheral wall of the locking part (12) and having a rectangular cross-section.

5. A rivet according to any one of claims 2-4, characterized in that: The ratio of the diameter ØdC of the shank portion (13) of the rivet (1) to the minimum inner diameter Ød0 of the self-locking groove structure (5) satisfies: ØdC / Ød0 = 0.9 to 1.

2.

6. A rivet according to claim 1, characterized in that: The shank (13) includes a threaded section (131) and two smooth sections (132) connected to both ends of the threaded section (131). One of the smooth sections (132) is connected to the locking part (12). The locking part (12) is a columnar solid section that connects the shank head (11) and the shank (13). The other smooth section (132) has a rivet groove structure (6) extending circumferentially on its outer peripheral wall. The cross-sectional structure of the rivet groove structure includes a first inclined surface, a second plane and a third inclined surface that are continuously connected.

7. A rivet according to claim 6, characterized in that: The rivet rod portion (13) also includes a rivet limiting end (133) adjacent to the rivet groove structure (6) and disposed at one end of the smooth rod section (132), wherein the rivet limiting end (133) has a vertical bearing surface (134) on the side facing the rivet groove structure (6).

8. A riveting connection assembly, characterized in that: The device includes a collar (2) and a rivet (1) according to any one of claims 1-7, wherein the collar (2) is used to be installed in the connecting hole of the connected part (7), and the rivet (1) applies axial pressure to the collar (2) during the riveting operation.

9. The riveting connection assembly according to claim 8, characterized in that: The collar (2) has a pre-formed annular protrusion structure (3) extending circumferentially on its cylindrical wall. When the collar (2) is subjected to axial compression during the riveting process of the rivet (1), the annular protrusion structure (3) undergoes radial plastic deformation in a preset direction before other cylindrical wall parts of the collar (2), thereby forming a drum-shaped locking structure (4) that is fastened between the rivet head and the connected part (7).

10. The riveting connection assembly according to claim 9, characterized in that: The collar (2) includes a limiting section (22) and an extension body section (21) arranged coaxially. The outer peripheral wall of the extension body section (21) is provided with a pre-formed annular protrusion structure (3). The annular protrusion structure (3) is distributed in a continuous ring or at intervals along the circumference of the extension body section (21).

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