A lightweight flat-head rivet nut

Abstract

This utility model discloses a lightweight flat-head rivet nut, comprising a nut body, a flat-head flange, an embedded weight-reducing cavity, and a riveting deformation zone. The nut body has a cylindrical structure with a through-hole threaded hole inside; the flat-head flange is located at the top and integrated with the nut body, with its top surface flush to form the mounting surface; the embedded weight-reducing cavity is axially located inside the nut body, and has reinforcing ribs on its periphery to enhance structural strength; the riveting deformation zone is located at the bottom, is conical, and has a spiral guide groove on its outer surface to optimize the material flow path during the riveting process. This application achieves a balance between lightweight and high strength through the embedded weight-reducing cavity and reinforcing rib design, while improving riveting efficiency and connection reliability.

Description

Technical Field

[0001] This utility model relates to the field of rivet nut technology, specifically to a lightweight flat-head rivet nut. Background Technology

[0002] With the development of riveting fastener technology, various rivet nuts are increasingly widely used in the automotive, aerospace, and electronic equipment industries. However, these products still have some problems in practical use. For example, most rivet nuts on the market are made of traditional metal materials, have relatively simple structural designs, and are quite heavy, making them difficult to meet the requirements of applications with high lightweight requirements (such as new energy vehicles and drone structural connections). In addition, the head shape of existing rivet nuts is mostly cylindrical or hexagonal, lacking a flat head design suitable for space-constrained situations, which limits their application in thin plate structures or components with high surface flatness requirements.

[0003] In the prior art, a rivet nut includes a stop portion, a tubular portion, an elastic deformation portion, and a threaded connecting body. It achieves riveting functionality through elastic deformation and can be installed and disassembled without relying on special tools. Although this design has good disassembly and a certain degree of adaptability, its overall structure is still mainly made of metal, and it does not consider the need for lightweight design. Furthermore, the head structure is not flat-headed, which cannot meet the requirements of certain assembly scenarios for low height and a flat appearance.

[0004] A type of riveted nut includes a nut body, a flange bearing portion, and a riveted portion, enabling connection between dissimilar materials such as steel and aluminum, and possessing strong axial load-bearing capacity and torsional resistance. However, this design primarily focuses on connection strength and applicability, without addressing lightweight improvements. Furthermore, its external structure remains predominantly cylindrical or prismatic, lacking a flat-head structure suitable for embedded installation in thin plates, thus limiting its lightweight and space adaptability.

[0005] The above issues indicate that current rivet nut products on the market cannot adequately meet the demands of emerging industrial sectors for high-strength, low-weight, and compact connection methods in terms of lightweight and flat-head structural design. Utility Model Content

[0006] To address the shortcomings of the existing technology, this utility model proposes a lightweight flat-head rivet nut.

[0007] To achieve the above-mentioned technical effects, the present invention adopts the following solution:

[0008] A lightweight flat-head rivet nut includes a nut body, a flat-head flange, an embedded weight-reducing cavity, and a riveting deformation zone. The nut body is cylindrical and has a through threaded hole inside. The flat-head flange is located at the top of the nut body and is fixed integrally with it. The top surface of the flat-head flange is flush with the top surface of the nut body, forming a flat mounting surface. The embedded weight-reducing cavity is opened along the axial direction of the nut body inside the nut body and is located outside the threaded hole. The inner wall of the embedded weight-reducing cavity has several evenly distributed reinforcing ribs, which extend along the axial direction of the nut body and are fixedly connected to it. The riveting deformation zone is located at the bottom of the nut body and is a tapered structure with a gradually decreasing outer diameter. The outer surface of the riveting deformation zone has a spiral guide groove. The groove depth gradually increases from top to bottom, and the groove width remains consistent and is tangent to the outer wall of the nut body.

[0009] A further preferred embodiment: the number of reinforcing ribs is eight and they are evenly distributed along the circumference of the embedded weight-reducing cavity. The cross-section of the reinforcing ribs is trapezoidal and their width gradually increases from the inside to the outside. The top of the reinforcing ribs is fixedly connected to the inner wall of the embedded weight-reducing cavity, and the bottom of the reinforcing ribs is fixedly connected to the outer wall of the nut body.

[0010] A further preferred embodiment: the helix angle of the guide groove is 15° to 30°, the maximum depth of the guide groove is one-tenth of the outer diameter of the riveting deformation zone, and the width of the guide groove is one-twentieth to one-fifteenth of the outer diameter of the riveting deformation zone.

[0011] Compared with existing technologies, the beneficial effects are:

[0012] 1. The combination design of embedded weight-reducing cavity and reinforcing ribs reduces the overall weight while ensuring the mechanical strength of the nut body, meeting the requirements of lightweighting; 2. The spiral guide groove design of the riveting deformation zone optimizes the material flow path during the riveting process, improving riveting efficiency and connection reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.

[0014] Reference numerals: 1. Nut body; 2. Flat flange; 3. Embedded weight reduction cavity; 4. Riveting deformation zone; 5. Threaded hole; 6. Reinforcing rib; 7. Guide groove. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] A lightweight flat-head rivet nut includes a nut body 1, a flat-head flange 2, an embedded weight-reducing cavity 3, a riveting deformation zone 4, reinforcing ribs 6, and a guide groove 7. The nut body 1 is a cylindrical structure with a through threaded hole 5 for fastening with a bolt. The flat-head flange 2 is located at the top of the nut body 1 and is fixed integrally with it; its top surface is flush with the top surface of the nut body 1, forming a flat mounting surface. The embedded weight-reducing cavity 3 is axially located inside the nut body 1 and surrounding the threaded hole 5; its cross-section is annular, and its thickness is one-third to one-half of the wall thickness of the nut body 1. The riveting deformation zone 4 is located at the bottom of the nut body 1 and is a tapered structure with a gradually decreasing outer diameter; its outer surface has a spiral guide groove 7.

[0017] The inner wall of the embedded weight-reducing cavity 3 is provided with eight evenly distributed reinforcing ribs 6, which extend axially along the nut body 1 and are fixedly connected to it. The cross-section of the reinforcing rib 6 is trapezoidal, and its width gradually increases from the inside to the outside. The top is fixedly connected to the inner wall of the embedded weight-reducing cavity 3, and the bottom is fixedly connected to the outer wall of the nut body 1. This design not only reduces the amount of material used, but also increases the bending resistance and overall strength of the nut body 1 through the reinforcing ribs 6. The number and distribution of the reinforcing ribs 6 are optimized to ensure that the embedded weight-reducing cavity 3 reduces weight without significantly weakening the mechanical properties of the nut body 1.

[0018] The outer surface of the riveting deformation zone 4 is provided with a spiral guide groove 7. The depth of the guide groove 7 gradually increases from top to bottom, while the width remains constant and is tangent to the outer wall of the nut body 1. The helix angle of the guide groove 7 is 15° to 30°, the maximum groove depth is one-tenth of the outer diameter of the riveting deformation zone 4, and the groove width is one-twentieth to one-fifteenth of the outer diameter of the riveting deformation zone 4. The design of the guide groove 7 optimizes the material flow path during the riveting process, allowing the nut to undergo more uniform plastic deformation during riveting, thereby improving the riveting quality and reducing the force required for installation.

[0019] The reinforcing rib 6 has a trapezoidal cross-section, with its width gradually increasing from the inside to the outside. The top of the reinforcing rib 6 is fixedly connected to the inner wall of the embedded weight-reducing cavity 3, and the bottom is fixedly connected to the outer wall of the nut body 1. The trapezoidal cross-section design increases the bending resistance of the reinforcing rib 6, allowing it to better distribute stress when subjected to external loads, thereby improving the overall strength of the nut body 1.

[0020] The working principle is as follows:

[0021] When lightweight flat-head rivet nuts are installed into thin-plate structures, pressure is first applied to the riveting deformation zone 4 using a riveting tool. Due to the conical structure of the riveting deformation zone 4 and the design of the spiral guide groove 7, the material can flow evenly along the path of the guide groove 7 during the riveting process, thereby achieving a high-quality riveting effect.

[0022] In summary, this utility model, through the combined design of the embedded weight-reducing cavity 3 and the reinforcing ribs 6, reduces the overall weight while ensuring the mechanical strength of the nut body 1; the spiral guide groove 7 of the riveting deformation zone 4 optimizes the material flow path during the riveting process, improving riveting efficiency and connection reliability.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component 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.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A light-weight flush head rivet nut characterized by: The nut body (1) is cylindrical and has a through threaded hole (5) inside. The top of the nut body (1) is provided with a flat flange (2), which is fixedly connected to the nut body (1) and flush with the top surface. An embedded weight-reducing cavity (3) is provided inside the nut body (1) along the axial direction. The embedded weight-reducing cavity (3) is located outside the threaded hole (5). The inner wall of the embedded weight-reducing cavity (3) is provided with reinforcing ribs (6), which extend along the axial direction of the nut body (1) and are fixedly connected to it. A riveting deformation area (4) is provided at the bottom of the nut body (1). The riveting deformation area (4) is a tapered structure with a gradually decreasing outer diameter. A spiral guide groove (7) is provided on its outer surface. The groove depth of the guide groove (7) gradually increases from top to bottom, and the groove width remains consistent and is tangent to the outer wall of the nut body (1).

2. A light-weight flush riv-nut according to claim 1, characterized in that: The number of the reinforcing ribs (6) is eight and they are evenly distributed along the circumference of the embedded weight-reducing cavity (3). The cross-section of the reinforcing ribs (6) is trapezoidal, and the width gradually increases from the inside to the outside. The top of the reinforcing ribs (6) is fixedly connected to the inner wall of the embedded weight-reducing cavity (3), and the bottom is fixedly connected to the outer wall of the nut body (1).

3. A light-weight flat head riveted nut according to claim 1, characterized in that: The helix angle of the guide groove (7) is 15° to 30°, the maximum groove depth is one-tenth of the outer diameter of the riveting deformation zone (4), and the groove width is one-twentieth to one-fifteenth of the outer diameter of the riveting deformation zone (4).

4. A light-weight flat head nut according to claim 1, wherein: The outer wall of the nut body (1) and the tapered structure of the riveting deformation area (4) are smoothly transitioned, and the width of the guide groove (7) is tangent to the outer wall of the nut body (1).

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