A connecting structure and fastener

Abstract

This invention discloses a connection structure and fastener, comprising a fastener including a body, an insert portion disposed at one end of the body, and a washer installed within the insert portion. The body has an axially penetrating inner hole, the inner wall of which has an internal thread adjacent to the insert portion. The washer is interference-fitted with the insert portion, thereby forming a blind hole in the fastener. The other end of the body also has a riveting portion; a plate having a riveting hole for connecting with the riveting portion, the fastener being interference-fitted with the plate; and a bolt including a threaded shank threadedly connected to the body of the fastener and a nut connected to the end of the shank away from the fastener. The bolt is used to fix at least one connector, the connector being fitted against the side of the plate away from the fastener, and the nut abutting against the other side of the connector, thereby fixing the connector. In this invention, the internal thread of the fastener penetrates the body, having a longer effective thread length within a limited axial space, thereby ensuring connection strength.

Description

Technical Field

[0001] This invention relates to the field of fastener technology, and more specifically to a connection structure and fastener. Background Technology

[0002] In existing technologies, fasteners with blind holes are often used for sealing performance. One end is closed, and the other end is open for machining internal threads, thus achieving a mating connection with the bolt. However, in actual machining, to ensure the guiding space of the tap, a certain length of unthreaded area needs to be reserved at the bottom of the fastener. This results in the thread not being able to reach the bottom of the fastener, limiting the effective thread length.

[0003] To meet connection strength requirements, fasteners with this type of blind hole often need to have an extended body to provide sufficient thread length. Therefore, existing fasteners require increased material usage and processing costs. Furthermore, the blind hole structure of existing fasteners presents challenges in chip removal during tapping, easily leading to unstable thread quality and affecting assembly reliability. Summary of the Invention

[0004] To overcome the above shortcomings, the purpose of this invention is to provide a connection structure and fastener. In this invention, the internal thread of the fastener penetrates the body and extends from the embedded part to the rivet tooth, having a longer effective thread length within a limited axial space, thereby enabling the mating bolt to be screwed in deeper and ensuring connection strength.

[0005] Technical solution: This invention discloses a connection structure, comprising:

[0006] The fastener includes a body, an insert portion disposed at one end of the body, and a washer installed in the insert portion. The body has an axially penetrating inner hole, and the inner wall of the inner hole has an internal thread adjacent to the insert portion. The washer is interference-fitted with the insert portion, thereby forming a blind hole. The other end of the body also has a riveting portion.

[0007] A sheet metal plate having rivet holes for connection with the riveting portion, wherein the fastener is interference-fitted with the sheet metal plate;

[0008] A bolt, the bolt comprising a threaded rod that is threadedly connected to the body of the fastener and a nut connected to one end of the threaded rod away from the fastener;

[0009] The bolt is used to fix at least one connector having a connecting hole. The connector is fitted against the side of the plate opposite to the fastener. The screw passes through the connecting hole, and the nut abuts against the other side of the connector, thereby fixing the connector.

[0010] Furthermore, the riveting part includes an annular convex circle disposed at the end of the body and a pressing riveting tooth surrounding the outer periphery of the annular convex circle. The annular convex circle is inclined outward radially from the body, and the end face of the pressing riveting tooth facing away from the body is inclined inward, and the end face forms an R angle with the outer wall surface of the annular convex circle.

[0011] Furthermore, the outer diameter of the body is larger than the outer diameter of the riveting teeth and the annular convex circle.

[0012] Furthermore, the end face of the body facing away from the annular convex circle includes a tapered guide groove, the diameter of which gradually decreases in the direction of the internal thread, and the smaller diameter end of the guide groove is connected to the embedding part.

[0013] The present invention also discloses a fastener, including a body, an insert portion disposed at one end of the body, and a washer installed in the insert portion. The body has an axially penetrating inner hole, and the inner wall of the inner hole has an internal thread adjacent to the insert portion. The washer is interference-fitted with the insert portion, thereby the fastener forming a blind hole.

[0014] Furthermore, the end of the body opposite to the embedded part also has a riveting part.

[0015] Furthermore, the riveting part includes an annular convex circle and a pressing riveting tooth surrounding the outer periphery of the annular convex circle. The annular convex circle is radially outward from the body, and the end face of the pressing riveting tooth facing away from the body is inclined inward, and the end face forms an R angle with the outer wall surface of the annular convex circle.

[0016] Furthermore, the end face of the body facing away from the annular convex circle includes a tapered guide groove, the diameter of which gradually decreases in the direction of the internal thread, and the smaller diameter end of the guide groove is connected to the embedding part.

[0017] The beneficial effects of this invention are as follows:

[0018] (1) In this invention, the internal thread of the fastener penetrates the body and extends from the embedded part to the rivet tooth, and has a longer effective thread length in a limited axial space, so that the mating bolt can be screwed in deeper and the connection strength is guaranteed.

[0019] (2) The fastener body of the present invention has a through hole structure, which is conducive to chip removal during tapping and reduces the problems of chip jamming and chip accumulation during thread processing;

[0020] (3) When the fastener described in this invention is electroplated, the internal thread penetrating the fastener is easier to electroplat, thereby significantly enhancing the corrosion resistance of the internal thread of the fastener and extending its service life.

[0021] (4) The present invention achieves gasket riveting by interference fit between the gasket and the body to form a closed end face, so that the fastener of the present invention can also have the sealing effect of blind hole fastener. Attached Figure Description

[0022] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances. In the drawings:

[0023] Figure 1 This is a schematic diagram of the connection structure described in this invention;

[0024] Figure 2 This is a schematic diagram of the fastener described in this invention;

[0025] Figure 3 This is a schematic diagram of the fastener described in this invention;

[0026] Figure 4 This is a cross-sectional view of the fastener described in this invention;

[0027] Figure 5 This is a cross-sectional view of one embodiment of the fastener described in this invention;

[0028] Figure 6 This is a cross-sectional view of one embodiment of the fastener described in this invention;

[0029] Figure 7 This is a schematic diagram of the distribution of internal threads in fasteners in the prior art.

[0030] In the figure: 1. Fastener; 11. Body; 12. Annular convex circle; 13. Riveting tooth; 14. Washer; 15. Insertion part; 16. Internal thread; 17. Guide groove; 18. R-angle; 2. Plate; 21. Riveting hole; 3. Bolt; 31. Screw; 32. Nut; 4. Connector; 41. Connecting hole. Detailed Implementation

[0031] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0032] In the description of this invention, 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 the invention 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 the invention. 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 invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0033] like Figure 1 As shown, the present invention discloses a connection structure, comprising:

[0034] Fastener 1 includes a body 11, an insert portion 15 disposed at one end of the body 11, and a washer 14 installed in the insert portion 15. The body 11 has an axially penetrating inner hole, and the inner wall of the inner hole has an internal thread 16 that is adjacent to the insert portion 15. The washer 14 is interference-fitted with the insert portion 15, thereby forming a blind hole in the fastener 1. The other end of the body 11 also has a riveting portion.

[0035] Plate 2, plate 2 has a rivet hole 21 for connecting with the rivet part, and fastener 1 is interference fit with plate 2;

[0036] Bolt 3 includes a threaded rod 31 that is threadedly connected to the body 11 of fastener 1 and a nut 32 connected to the end of the threaded rod 31 away from fastener 1.

[0037] Bolt 3 is used to fix at least one connector 4, connector 4 having a connecting hole 41, connector 4 is attached to the side of plate 2 away from fastener 1, screw 31 passes through connecting hole 41, and nut 32 abuts against the other side of connector 4, thereby fixing connector 4.

[0038] With the above structure, the internal thread 16 penetrates the body 11 of the fastener 1 and extends from the insert portion 15 to the riveting portion, thereby enabling the bolt 3 to be stably connected to the internal thread 16 of the body 11. The washer 14 is provided in the insert portion 15 by riveting and forms an interference fit with the body 11, thereby forming a closed blind hole structure. The shape of the washer 14 includes, but is not limited to, a circle, and the shape of the insert portion 15 is adapted to the shape of the washer 14.

[0039] Specifically, the riveting part includes an annular convex circle 12 disposed at the end of the body 11 and a pressing riveting tooth 13 surrounding the outer periphery of the annular convex circle 12. The annular convex circle 12 is radially outward from the body 11, and the end face of the pressing riveting tooth 13 facing away from the body 11 is inclined inward, and the end face forms an R angle 18 with the outer wall surface of the annular convex circle 12.

[0040] The annular convex circle 12 and the rivet teeth 13 are inserted into the rivet holes 21 of the plate 2, and are riveted to the plate 2 by the rivet teeth 13 to form an interference fit, thereby achieving a reliable connection between the fastener 1 and the plate 2. The connection structure of the present invention also includes a connector 4, which is pressed against the side of the plate 2 away from the fastener 1, and then connected to the internal thread 16 of the body 11 by the screw 31 of the bolt 3. The other side of the connector 4 is pressed against the nut 32, thereby achieving effective clamping and fixing of the connector 4. It can be understood that at least one connector 4 can be clamped between the bolt 3 and the fastener 1. When the nut 32 is in contact with the connector 4, the end of the screw 31 away from the nut 32 will at most contact the washer 14, avoiding additional compression of the washer 14, thereby compressing the sealing performance of the fastener 1.

[0041] Furthermore, the outer diameter of the body 11 is larger than the outer diameter of the rivet teeth 13 and the annular convex circle 12. The annular convex circle 12 is radially outward from the body 11, so that it can be more smoothly guided into the rivet hole 21 of the plate 2 during the installation of the fastener 1. In addition, the end face of the rivet teeth 13 facing away from the body 11 is set to be inwardly inclined. This inwardly inclined end face forms a smooth R angle 18 transition with the outer wall surface of the annular convex circle 12. So that when the fastener 1 is riveted to the plate 2, the partially deformed plate 2 can enter into the R angle 18. With the outwardly inclined annular convex circle 12, an anti-pull-out structure can be formed between the fastener 1 and the plate 2, firmly riveting the plate 2 to the fastener 1.

[0042] Preferably, a tapered guide groove 17 is provided on the end face of the body 11 opposite to the annular convex circle 12. The diameter of the guide groove 17 gradually decreases from the outside to the inside, i.e., towards the internal thread 16 of the body 11. The end of the guide groove 17 with a smaller diameter connects to the insert portion 15 of the body 11, forming a natural transition. The tapered guide groove 17 can effectively guide the placement of the gasket 14, helping the gasket 14 to accurately align with the insert portion 15 to be riveted, thereby allowing the gasket 14 to be accurately embedded into the insert portion 15, forming a sealed blind hole structure with the body 11.

[0043] like Figures 2 to 6As shown, the present invention also discloses a fastener 1, including a body 11, an insert portion 15 disposed at one end of the body 11, and a washer 14 installed in the insert portion 15. The body 11 has an axially penetrating inner hole, and the inner wall of the inner hole has an internal thread 16 that is adjacent to the insert portion 15. The washer 14 is interference-fitted with the insert portion 15, thereby the fastener 1 forms a blind hole.

[0044] Furthermore, the end of the body 11 away from the embedded part 15 also has a riveting part, which includes an annular convex circle 12 and a riveting tooth 13 surrounding the outer periphery of the annular convex circle 12. The annular convex circle 12 is inclined outward from the radial direction of the body 11, and the end face of the riveting tooth 13 away from the body 11 is inclined inward, and the end face forms an R angle 18 with the outer wall surface of the annular convex circle 12.

[0045] With the above structure, an annular convex circle 12 is disposed at one end of the body 11, and a riveting tooth 13 surrounds its outer circumference. This tooth is used to pass through and rivet the fastener 1 to the plate 2 during the installation process, thereby achieving a stable connection between the fastener 1 and the plate 2. The external structure of the riveting tooth 13 enables the fastener 1 to achieve a self-locking and anti-rotation effect, significantly improving the reliability of the connection.

[0046] In addition, the other end of the body 11 of the fastener 1 is provided with an insert portion 15. The internal thread 16 of the body 11 extends axially from the insert portion 15 to a position near the rivet tooth 13, forming a threaded channel that penetrates the body 11, facilitating the threaded connection between fastening elements such as bolts 3 and the fastener 1. A washer 14 is disposed inside the insert portion 15. The washer 14 is installed in the insert portion 15 by an interference fit, so that the fastener 1 can form a sealed blind hole under the action of the washer 14. It can be understood that since the washer 14 needs to be pressed into the insert portion 15 by external force, the internal thread 16 is in a state of penetrating the body 11 before the washer 14 is inserted. That is to say, compared with the existing blind hole fastener 1, the fastener 1 provided by the present invention does not need to reserve guide space for the tap to form the internal thread 16. That is, the internal thread 16 can be formed by the tap over the entire length of the fastener 1. The fastener 1 of the present invention can form a longer internal thread 16 in a relatively short space. Furthermore, since the internal thread 16 of the fastener 1 of the present invention is a through hole, it is easier to produce and remove chips during tapping, thereby improving the machining quality of the internal thread 16. Compared with conventional blind hole fasteners 1, the through hole structure of the fastener 1 provided by the present invention is also easier to electroplate for corrosion protection, thus giving the fastener 1 of the present invention superior corrosion resistance.

[0047] Preferably, the annular convex circle 12 is radially outward from the body 11. The inclined structure of the annular convex circle 12 allows the fastener 1 to have a better guiding effect during press-fit installation, which is conducive to quickly positioning the installation position and smoothly guiding the fastener 1 into the riveting hole 21 of the plate 2. The end face of the press-fit tooth 13 facing away from the body 11 is inclined inward, and the R angle 18 formed between this end face and the outer wall surface of the annular convex circle 12 plays a smooth transition role. When the fastener 1 is press-fitted to the plate 2, part of the plate 2 deforms and enters the R angle 18. Due to the inclined structure of the annular convex circle 12, in conjunction with the R angle 18 that accommodates the plate 2, an anti-pull-out structure is formed between the fastener 1 and the plate 2, enhancing the pull-out resistance and vibration resistance.

[0048] A tapered guide groove 17 is provided on the end face of the body 11 opposite to the annular convex circle 12. The diameter of the guide groove 17 gradually decreases along the direction extending toward the internal thread 16, forming a channel from a wide opening to a narrow opening. The smaller end of the guide groove 17 is connected to the insert portion 15, forming a natural transition. The tapered guide groove 17 can effectively guide the placement of the gasket 14, helping the gasket 14 to accurately align with the insert portion 15 to be riveted, thereby allowing the gasket 14 to be accurately embedded into the insert portion 15, forming a sealed blind hole structure with the body 11.

[0049] Please refer to Figure 7 As shown, because existing tapping drill bits do not have a tapping section at the front end, internal threads 16 cannot be formed on the inner wall of the bottom of the blind hole during blind hole tapping. In this invention, through holes are machined in the intermediate part, and internal threads 16 are formed on the inner wall of each through hole. Combined with the insert portion 15 for mounting the washer 14, the body 11 and the washer 14 are riveted together to obtain a fastener 1 with a blind hole. Compared with existing fasteners 1 with internal threads, the fastener 1 provided by this invention can have a longer range of internal threads 16 while maintaining the same blind hole depth, thus providing the longest possible internal thread 16 within a limited space, while also ensuring sealing performance.

[0050] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A connection structure, characterized in that, include: The fastener includes a body, an insert portion disposed at one end of the body, and a washer installed in the insert portion. The body has an axially penetrating inner hole, and the inner wall of the inner hole has an internal thread adjacent to the insert portion. The washer is interference-fitted with the insert portion, thereby forming a blind hole. The other end of the body also has a riveting portion. A sheet metal plate having rivet holes for connection with the riveting portion, wherein the fastener is interference-fitted with the sheet metal plate; A bolt, the bolt comprising a threaded rod that is threadedly connected to the body of the fastener and a nut connected to one end of the threaded rod away from the fastener; The bolt is used to fix at least one connector having a connecting hole. The connector is fitted against the side of the plate opposite to the fastener. The screw passes through the connecting hole, and the nut abuts against the other side of the connector, thereby fixing the connector.

2. The connection structure according to claim 1, characterized in that, The riveting part includes an annular convex circle disposed at the end of the body and a pressing riveting tooth surrounding the outer periphery of the annular convex circle. The annular convex circle is inclined outward radially from the body, and the end face of the pressing riveting tooth facing away from the body is inclined inward, and the end face forms an R angle with the outer wall surface of the annular convex circle.

3. The connection structure according to claim 2, characterized in that, The outer diameter of the body is larger than the outer diameter of the rivet teeth and the annular convex circle.

4. The connection structure according to claim 2, characterized in that, The end face of the body away from the annular convex circle includes a tapered guide groove. The diameter of the guide groove gradually decreases in the direction of the internal thread, and the end with the smaller diameter of the guide groove is connected to the embedding part.

5. A fastener, characterized in that, The fastener includes a body, an insert portion disposed at one end of the body, and a gasket installed in the insert portion. The body has an axially penetrating inner hole, and the inner wall of the inner hole has an internal thread adjacent to the insert portion. The gasket is interference-fitted with the insert portion, thereby forming a blind hole.

6. The fastener according to claim 5, characterized in that, The end of the body opposite to the embedded part also has a riveting part.

7. The fastener according to claim 6, characterized in that, The riveting part includes an annular convex circle and a riveting tooth surrounding the outer periphery of the annular convex circle. The annular convex circle is radially outward from the body, and the end face of the riveting tooth facing away from the body is inclined inward, and the end face forms an R angle with the outer wall surface of the annular convex circle.

8. The fastener according to claim 7, characterized in that, The end face of the body away from the annular convex circle includes a tapered guide groove. The diameter of the guide groove gradually decreases in the direction of the internal thread, and the end with the smaller diameter of the guide groove is connected to the embedding part.

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