A self-locking nut structure for an embedded expansion support plate

Abstract

The present application relates to the technical field of fasteners, and specifically discloses an embedded flaring support plate self-locking nut structure, which includes a flaring section, a closing section, a support plate, and an embedded section. The nut is composed of a flaring section, a support plate, and a closing section from top to bottom. An annular embedded section is provided between the flaring section and the support plate. The embedded section includes convex teeth distributed along the circumference of the flaring section, the outer diameter of the convex teeth is larger than the outer diameter of the flaring section, and the tooth top circle diameter of the convex teeth is smaller than the outer diameter of the support plate; a channel 1 penetrating the side wall of the closing section is provided, and the side wall of the closing section is hinged with an arc-shaped clip strip, one end of the clip strip extends to the opening of the closing section, and the other end of the clip strip extends into channel 1 and is slidably connected to channel 1. This solution solves the problems of difficult processing of existing nuts, harsh installation conditions, and high risk of falling off.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to an embedded type flared support plate self-locking nut structure. Background Art

[0002] Ordinary nuts will loosen themselves due to vibration and other reasons during use. To prevent this phenomenon, self-locking nuts were invented. The main function of self-locking nuts is to prevent loosening and vibration, and they are used in special occasions. When selecting the material of aerospace fasteners, specific strength, fatigue resistance, corrosion resistance, rigidity, brittleness, compatibility, heat resistance and other properties are important indicators. With the development of self-locking products, higher requirements are placed on the installation and use reliability of self-locking nuts.

[0003] At present, the flared support plate self-locking nut used is composed of three parts: the flared section, the support plate and the closed section, in which the support plate is a non-circular structure (such as Figure 1 , 2 As shown). The method of using the flared support plate self-locking nut is: after the flared section is extended into the installation hole, the flared section is pressed and deformed on the surface of the base by external force, and the nut is axially fixed by the limit between the flared section and the support plate to prevent the nut from falling off; the support plate is cut flat on one side or both sides, and the cut surface is close to the step of the base itself or the support plate is installed as a whole into the annular groove of the base to realize the overall anti-rotation function of the nut during installation; self-locking is achieved by flattening the closing section to form a self-locking structure.

[0004] The above structure has the following defects in actual use: (1) The structural dimensions of the nut are large and the processing is relatively complex, requiring milling; (2) The installation of the nut takes up a large space, requiring a wider base (casing) flange width and harsh installation conditions. The single-sided flattened nut can only be used for bases (casings) with steps on the inner ring and the appropriate distance, and the double-sided flattened nut can only be used for installation at the position where an annular groove is processed on the annular flange of the base (casing), resulting in large structural dimensions of the base and great processing difficulty, which is not conducive to reducing the size of the base (casing) and reducing the weight of aviation structural parts; (3) The nut relies entirely on the expansion of the expansion section to prevent the nut from falling off, resulting in a high risk of the nut falling off. Summary of the invention

[0005] The present invention provides an embedded expansion support plate self-locking nut structure to overcome the defects of the prior art.

[0006] To solve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an embedded flaring support plate self-locking nut structure, comprising a flaring section, a support plate, and a closing section, wherein the nut is composed of a flaring section, a support plate, and a closing section from top to bottom, and an annular embedded section is provided between the flaring section and the support plate, wherein the embedded section comprises convex teeth distributed along the circumference of the flaring section, wherein the outer diameter of the convex teeth is larger than the outer diameter of the flaring section, and the tooth top circle diameter of the convex teeth is smaller than the outer diameter of the support plate;

[0007] A channel 1 penetrating the side wall is provided on the side wall of the closing section, and an arc-shaped clamping strip is hinged on the side wall of the closing section, one end of the clamping strip extends to the opening of the closing section, and the other end of the clamping strip extends into the channel 1 and is slidably connected to the channel 1.

[0008] The basic principle of this scheme is: when in use, the nut embedding section is pulled and embedded into the base, and the strength of the embedding section is slightly greater than the strength of the base, so that the convex teeth of the embedding section are embedded with the inner wall of the base hole, and then the flaring section is flared, and the length of the support plate and the flaring axial direction fixes the nut on the base (the installation diagram is shown in the figure). Figure 6 As shown), the functions of fixing, preventing rotation and preventing loosening are achieved.

[0009] The beneficial effects of this program are:

[0010] 1. The existing nuts have large structural dimensions and are relatively complex to process, requiring milling. The nuts of this solution can be processed using only rotary equipment, eliminating the process of milling the shape of the support plate, thereby simplifying the processing process and reducing the difficulty of processing.

[0011] 2. The existing nut installation takes up a large space and the installation conditions are relatively harsh. After adopting the nut of this solution, the mounting hole on the base only needs to be a round hole for installation, and there is no need to mill a groove according to the shape of the support plate, thereby simplifying the mounting hole processing process and reducing the processing difficulty.

[0012] 3. The risk of existing nuts falling off is relatively high. This solution adopts the method of embedding the convex teeth of the embedded section into the base to replace the flat structure to achieve the effect of preventing the nut from rotating. After the embedded section of the nut is embedded in the base, it can not only prevent the nut from rotating but also prevent the nut from axial sliding, which can effectively prevent the nut from falling off, which is consistent with the function of the flared section after expansion and riveting, thereby more effectively preventing the nut from falling off.

[0013] Furthermore, the outer wall of the convex teeth is a straight knurled pattern, which increases the friction between the nut and the inner wall of the base opening, and at the same time increases the contact area with the inner wall of the base opening, making it easier to fit, and playing the role of fixing and preventing rotation and loosening.

[0014] Furthermore, the closing section is divided into two parts along the axial direction of the closing section, and the diameter of the end close to the support plate is larger than the diameter of the end away from the support plate, so as to facilitate the subsequent positioning and extrusion of the closing part of the nut.

[0015] Furthermore, the outer edge of the support plate is circular. The support plate plays the role of support and limit. The shape of the support plate is changed to a circular structure and the outer diameter of the support plate is reduced, so that it can be installed on a smaller base (casing), thereby reducing the weight of the aviation structure.

[0016] Furthermore, the flaring section, the supporting plate, the embedding section and the closing section are all coaxially arranged, so that it is easy to place and position accurately.

[0017] Furthermore, a bevel transition is adopted between the flared section and the embedded section, which facilitates the embedded section to enter the mounting hole on the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of a nut in the prior art;

[0019] Figure 2 It is a top view of a nut in the prior art;

[0020] Figure 3 is a schematic diagram of embodiment 1 of the present invention;

[0021] Figure 4 It is a top view of embodiments 1 and 2 of the present invention;

[0022] Figure 5 is a schematic diagram of Embodiment 2 of the present invention;

[0023] Figure 6 This is a schematic diagram of the installation of Example 1 of the present invention. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The figure marks in the drawings of the specification include: expansion section 1, support plate 2, closing section 3, embedding section 4, hinge 5, clamping strip 6, channel 1 7.

[0026] Embodiment 1:

[0027] Embodiment 1 is basically as attached Figure 3 , 4 Attached Figure 6 As shown:

[0028] like Figure 3 As shown, the embodiment is placed horizontally in the axial direction, and four parts are processed from left to right, namely, the flared section 1, the embedded section 4, the support plate 2, and the closed section 3, wherein the support plate 2 has the largest diameter, and the flared section 1 is covered with an annular embedded section 4, and the embedded section 4 is machined with straight knurling parallel to the axial direction on the circumference, and the straight knurling structure is as shown in FIG. Figure 4 The diameters of the two parts from left to right on the closing section 3 gradually decrease, and the wall thickness becomes thinner. During subsequent installation, the thinner section is flattened to form a self-locking structure to achieve locking of the bolt and nut.

[0029] The specific implementation process is as follows:

[0030] like Figure 6As shown, a special tool is used to align the flared section 1 of the nut with the mounting hole on the base and push it in. The straight knurling on the embedded section 4 squeezes the base, the inner wall of the base is deformed, and the nut is engaged with the base. The flared section 1 is then aligned with the special tool for rivet expansion. The support plate 2 and the riveted part fix the nut as a whole on the base plate. After the bolt is inserted, the closing section 3 is tightened. The closing section 3 is deformed to self-lock the bolt and nut.

[0031] Embodiment 2:

[0032] Embodiment 2 is basically as attached Figure 5 , 6 As shown:

[0033] The difference between this embodiment and embodiment 1 lies in the structure of the closing section 3, as shown in FIG. Figure 5 As shown, a channel 7 penetrating the side wall is provided on the closing section 3, an arc-shaped clamping strip 6 is hinged at the opening of the closing section 3, one end of the clamping strip 6 extends to the opening of the contraction section, and the other end of the clamping strip 6 extends into the channel 7. After the screw is installed in the nut, the screw contacts the arc-shaped clamping strip 6, and the clamping strip 6 in the channel moves toward the outer wall of the nut. As the screw moves, the clamping strip 6 contacts the screw under the extrusion effect and squeezes into the screw. The clamping strips 6 symmetrically arranged on both sides of the screw clamp the nut from both ends, so that the nut is locked.

[0034] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An embedded expansion support plate self-locking nut structure, comprising an expansion section, a support plate, and a closing section, characterized in that: The nut is composed of a flaring section, a support plate, and a closing section from top to bottom. An annular embedded section is provided between the flaring section and the support plate. The embedded section includes convex teeth distributed along the circumference of the flaring section. The outer diameter of the convex teeth is larger than the outer diameter of the flaring section, and the tooth top circle diameter of the convex teeth is smaller than the outer diameter of the support plate. A channel 1 penetrating the side wall is provided on the side wall of the closing section, and an arc-shaped clamping strip is hinged on the side wall of the closing section, one end of the clamping strip extends to the opening of the closing section, and the other end of the clamping strip extends into the channel 1 and is slidably connected to the channel 1.

2. The embedded expansion support plate self-locking nut structure according to claim 1, characterized in that: The outer wall of the convex tooth is a straight knurled pattern.

3. The embedded expansion support plate self-locking nut structure according to claim 1, characterized in that: The closing section is divided into two parts along the axial direction of the closing section, and the diameter of the end close to the support plate is larger than the diameter of the end away from the support plate.

4. The embedded expansion support plate self-locking nut structure according to claim 1, characterized in that: The outer edge of the supporting plate is circular.

5. The embedded expansion support plate self-locking nut structure according to claim 1, characterized in that: The expanding section, the supporting plate, the embedding section and the closing section are all coaxially arranged.

6. The embedded expansion support plate self-locking nut structure according to claim 1, characterized in that: An inclined surface transition is adopted between the flared section and the embedded section.

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