Outer hexagonal riveting nut

Abstract

The utility model provides an outer hexagonal riveting nut which comprises a nut body, a threaded hole is formed in the center of the nut body, a riveting cylinder is arranged on one end face of the nut body, the inner wall of the riveting cylinder is conical, the small-diameter end of the riveting cylinder faces the nut body, and meanwhile the small diameter of the riveting cylinder is not smaller than the large diameter of the threaded hole. Rotation stopping teeth are arranged on the outer wall of the riveting barrel at intervals in the circumferential direction of the riveting barrel and arranged in the axial direction of the riveting barrel, each rotation stopping tooth is sequentially provided with an outward turning section and an expansion section from the end, away from the nut body, of the riveting barrel to the nut body, and the tooth heights of the two ends of each outward turning section are equal. The tooth height of the expansion section is gradually increased from the outward turning section to the end face of the nut body, and the tooth root width is gradually increased. The riveting device has the advantage that the connection strength after riveting can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of fasteners, specifically to an external hexagonal crimp nut. Background Technology

[0002] The rivet nut is fitted to the rivet hole between the rivet cylinder and the plate. It is fitted to the plate by the expansion of the polygonal outer wall or by the sawtooth anti-rotation disc located at the connection between the nut body and the rivet cylinder. Then, it is fixed by turning the end face of the rivet cylinder outward. At the same time, the anti-rotation disc is pressed into the surface or inner hole of the plate to achieve circumferential fixation. Since the teeth of the anti-rotation disc are often shallow and the biting effect is poor, the rivet nut is prone to free rotation between the rivet hole of the plate and the plate when encountering high torque disassembly or thread seizure, making it difficult to remove the screw. Utility Model Content

[0003] Based on the above problems, the purpose of this utility model is to provide an external hexagonal riveting nut that can effectively improve the connection strength after riveting.

[0004] To address the above problems, the following technical solution is provided: an external hexagonal rivet nut, comprising a nut body, a threaded hole at the center of the nut body, and a rivet cylinder at one end face of the nut body. The inner wall of the rivet cylinder is conical, with its smaller diameter end facing the nut body while its smaller diameter is not less than the larger diameter of the threaded hole. The outer wall of the rivet cylinder is provided with anti-rotation teeth spaced along its circumferential direction and opening in its axial direction. The anti-rotation teeth have an outwardly turned section and an expansion section sequentially arranged from the end of the rivet cylinder away from the nut body towards the nut body. The tooth heights at both ends of the outwardly turned section are set at the same height. The tooth height and tooth root width of the expansion section gradually increase from the outwardly turned section to the end face of the nut body.

[0005] The present invention is further provided that the end of the outward-turned section away from the expansion section is provided with a guide section whose tooth height gradually decreases until it coincides with the intersection line of the end of the riveting cylinder and the outer wall.

[0006] The present invention is further configured such that the inner wall of the riveting cylinder corresponding to each outward turning section or expansion section is provided with an inner expansion groove opened along the generatrix direction.

[0007] The present invention is further configured such that the cross-section of the inner expansion groove is arc-shaped.

[0008] The present invention is further configured such that the width and depth of the inner expansion groove at both ends are equal to each other.

[0009] The present invention is further configured to include an outer expansion groove located on the outer wall of the riveting cylinder along its axial direction, corresponding to the adjacent inner expansion grooves.

[0010] The present invention is further configured such that the cross-section of the outer expansion groove is arc-shaped.

[0011] The present invention is further configured such that the width and depth of the grooves at both ends of the external expansion groove are equal to each other.

[0012] The present invention is further configured such that the inner expansion groove and the outer expansion groove have a tail section at the end position near the nut body, and the depth and width of the tail section gradually decrease to 0.

[0013] The present invention is further configured such that the nut body is a regular hexagon, a regular quadrilateral, or a regular octagon.

[0014] The beneficial effects of this utility model are:

[0015] 1. The riveting cylinder is used to insert into the riveting hole of the plate. The outward-turned section is in transition or clearance fit with the inner hole of the plate. When riveting begins, the thinnest wall of the end of the riveting cylinder will turn outward first. Then, the outward-turned section of the anti-rotation tooth will press into the surface of the plate. On the one hand, the outward-turning of the riveting cylinder achieves axial fixation. On the other hand, the outward-turned section of the anti-rotation tooth forms circumferential fixation on the surface of the plate. At the same time, the expansion section will gradually enter the riveting hole of the plate and bite into the inner wall of the riveting hole, further improving the circumferential fixation effect. After riveting is completed, the end face of the nut body abuts against one side of the plate, and the end face of the riveting cylinder, after turning outward, abuts against the other side of the plate, realizing the synchronous fixation of the inner hole and the end face, which greatly improves the load-bearing capacity.

[0016] 2. The combination of the outer expansion groove and the inner expansion groove can further reduce local stress concentration during the expansion of the riveting cylinder, thus avoiding or reducing the risk of cracking.

[0017] 3. The nut body is preferably hexagonal, which can be used with a wrench to assist in fixing during disassembly and assembly. Even when the riveting fails, the screw / bolt can be removed with the help of a wrench. Attached Figure Description

[0018] Figure 1 This is a first-view three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a second-view three-dimensional structural diagram of the present invention.

[0020] Figure 3 This is a first-view full-section three-dimensional structural diagram of the present invention.

[0021] Figure 4 This is a second-view full-section structural diagram of the present invention.

[0022] Figure 5 This is a front view of the present invention.

[0023] The labels in the diagram mean: 10-nut body; 11-threaded hole; 12-riveting cylinder; 13-anti-rotation tooth; 131-outward-facing section; 132-expansion section; 133-guide section; 134-inner expansion groove; 135-outer expansion groove; 136-tailing section. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] refer to Figures 1 to 5 ,like Figures 1 to 5 The diagram shows an external hexagonal rivet nut, comprising a nut body 10, a threaded hole 11 at the center of the nut body 10, and a rivet cylinder 12 at one end face of the nut body 10. The inner wall of the rivet cylinder 12 is conical, with its smaller diameter end facing the nut body 10 and its smaller diameter not less than the larger diameter of the threaded hole 11. The outer wall of the rivet cylinder 12 is provided with anti-rotation teeth 13 spaced along its circumferential direction and opening in its axial direction. The anti-rotation teeth 13 are provided with an outwardly turned section 131 and an expansion section 132 sequentially from the end of the rivet cylinder 12 away from the nut body 10 toward the nut body 10. The tooth heights at both ends of the outwardly turned section 131 are set at the same height. The tooth height of the expansion section 132 gradually increases and the tooth root width H1 gradually widens from the outwardly turned section 131 to the end face of the nut body 10.

[0026] In the above structure, the riveting cylinder 12 is used to be inserted into the riveting hole of the plate, and the outward-turned section 131 is in transition or clearance fit with the inner hole of the plate. When riveting begins, the thinnest end of the riveting cylinder 12 will be the first to turn outward, and then the outward-turned anti-rotation tooth 13's outward-turned section 131 will press into the surface of the plate. On the one hand, the outward-turning of the riveting cylinder 12 achieves axial fixation, and on the other hand, the outward-turned section 131 of the anti-rotation tooth 13 forms circumferential fixation on the surface of the plate. At the same time, the expansion section 132 will gradually enter the riveting hole of the plate and bite into the inner wall of the riveting hole, further improving the circumferential fixation effect. After riveting is completed, the end face of the nut body 10 abuts against one side of the plate, and the end face of the riveting cylinder 12, after turning outward, abuts against the other side of the plate, realizing the synchronous fixation of the inner hole and the end face, which greatly improves the load-bearing capacity.

[0027] In this embodiment, the end of the outward-turned section 131 away from the expansion section 132 is provided with a guide section 133 whose tooth height gradually decreases until it coincides with the intersection line of the end of the riveting cylinder 12 and the outer wall.

[0028] In the above structure, the guide section 133 provides guidance when the riveting cylinder 12 is inserted into the riveting hole.

[0029] In this embodiment, the inner wall of the riveting cylinder 12 corresponding to the positions of each outwardly turned section 131 or expansion section 132 is provided with an inner expansion groove 134 opened along the generatrix direction.

[0030] In the above structure, the expansion of the riveting cylinder 12 can reduce local stress concentration and avoid or reduce the risk of cracking.

[0031] In this embodiment, the cross-section of the inner expansion groove 134 is arc-shaped.

[0032] In the above structure, the stress is more evenly distributed when the riveting cylinder 12 expands.

[0033] In this embodiment, the width and depth of the inner expansion groove 134 at both ends are equal.

[0034] In this embodiment, an outer expansion groove 135 is also provided on the outer wall of the riveting cylinder 12 along its axial direction, corresponding to the adjacent inner expansion grooves 134.

[0035] In the above structure, the outer expansion groove 135, in conjunction with the inner expansion groove 134, can further reduce local stress concentration when the riveting cylinder 12 expands, thereby avoiding or reducing the risk of cracking.

[0036] In this embodiment, the cross-section of the outer expansion groove 135 is arc-shaped.

[0037] In the above structure, the stress is more evenly distributed when the riveting cylinder 12 expands.

[0038] In this embodiment, the width and depth of the outer expansion groove 135 at both ends are equal.

[0039] In this embodiment, the inner expansion groove 134 and the outer expansion groove 135 are provided with a tail section 136 at the end of the end near the nut body 10, and the depth and width of the tail section 136 gradually decrease to 0.

[0040] In the above structure, the tail section 136 is formed by a stamping die during the production of the riveting cylinder 12. Due to the structural design requirements of the stamping die, it can effectively protect and extend the service life of the die.

[0041] In this embodiment, the nut body 10 is a regular hexagon, a regular quadrilateral, or a regular octagon.

[0042] In the above structure, the nut body 10 is preferably a regular hexagon, which can be used with a wrench to assist in fixing during disassembly and assembly. Even when the riveting fails, the screw / bolt can be disassembled with the help of a wrench.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A hexagonal rivet nut, comprising a nut body, wherein the nut body has a threaded hole at its center, and a rivet cylinder is provided on one end face of the nut body, characterized in that: The inner wall of the riveting cylinder is conical, with its small diameter end facing the nut body and its small diameter not less than the large diameter of the threaded hole. The outer wall of the riveting cylinder is provided with anti-rotation teeth spaced along its circumferential direction and opening in its axial direction. The anti-rotation teeth are provided with an outward-turned section and an expansion section in sequence from the end of the riveting cylinder away from the nut body towards the nut body. The tooth heights at both ends of the outward-turned section are set at the same height. The tooth height of the expansion section gradually increases and the tooth root width gradually widens from the outward-turned section to the end face of the nut body.

2. The external hexagonal rivet nut according to claim 1, characterized in that: The end of the outward-turned section away from the expansion section is provided with a guide section whose tooth height gradually decreases until it coincides with the intersection line of the end of the riveting cylinder and the outer wall.

3. A hexagonal snap-fit ​​nut according to claim 1 or 2, characterized in that: The riveting cylinder has an inner expansion groove on its inner wall at each outward-turned or expanded section location, which is opened along the generatrix direction.

4. The external hexagonal rivet nut according to claim 3, characterized in that: The cross-section of the inner expansion groove is arc-shaped.

5. The external hexagonal rivet nut according to claim 4, characterized in that: The width and depth of the inner expansion groove are equal at both ends.

6. The external hexagonal rivet nut according to claim 3, characterized in that: It also includes an outer expansion groove, which is located on the outer wall of the riveting cylinder along its axial direction, corresponding to the adjacent inner expansion grooves.

7. The external hexagonal rivet nut according to claim 6, characterized in that: The cross-section of the outer expansion groove is arc-shaped.

8. The external hexagonal rivet nut according to claim 7, characterized in that: The width and depth of the expansion groove at both ends are equal.

9. A hexagonal snap-fit ​​nut according to claim 8, characterized in that: The inner expansion groove and the outer expansion groove have a tail section at one end near the nut body, and the depth and width of the tail section gradually decrease to 0.

10. A hexagonal snap-fit ​​nut according to claim 1, characterized in that: The nut body is a regular hexagon, a regular square, or a regular octagon.

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