Fastening assembly capable of being disassembled and assembled repeatedly

Abstract

The fastening assembly capable of being disassembled and assembled repeatedly comprises a fastening piece and a screw, the fastening piece comprises a plastic base and a metal nut, the plastic base is provided with a buckle structure, the metal nut is an insert nut and is provided with an internal thread, and the screw is arranged on the plastic base. The metal nut is fixed in the plastic seat by embedding the metal nut in the injection molding process of the plastic seat, and the screw interferes with the buckle structure and is provided with an external thread so as to be detachably connected with an internal thread of the metal nut through the external thread. According to the fastening assembly capable of being disassembled and assembled for multiple times, the screw is matched with the metal nut, the fastening requirements of different plate thicknesses and different materials can be met through the buckling structure of the plastic base, after multiple times of disassembly, the fastening force loss of the fastening assembly is small, the performance requirement can still be met after installation, and therefore the purpose of multiple times of disassembly and assembly is achieved; and the use number of fasteners is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fastener, more particularly to a fastening assembly capable of being disassembled and assembled multiple times. BACKGROUND

[0002] With the increasing frequency of part disassembly by automobile manufacturers, the number of disassembly cycles for fasteners also increases. Most fasteners on the market that combine plastic seats and screws typically use self-tapping thread solutions. However, self-tapping thread fasteners can usually only withstand 3 to 5 disassembly cycles. Once this number is exceeded, the function of the fastener gradually fails, leading to the problem of frequent replacement of the fastener. This not only increases maintenance costs, but can also affect assembly efficiency and vehicle reliability. Therefore, for application scenarios that require frequent disassembly, it is particularly important to find a fastener solution that can withstand more disassembly cycles. SUMMARY

[0003] In order to solve the problems of the fastener in the prior art not meeting the requirements of multiple disassembly and assembly, the utility model provides a fastening assembly capable of being disassembled and assembled multiple times.

[0004] The fastening assembly capable of being disassembled and assembled multiple times according to the utility model comprises a fastener and a screw, wherein the fastener comprises a plastic seat and a metal nut, the plastic seat has a buckle structure, the metal nut is an insert nut and has an internal thread, the metal nut is fixed in the plastic seat by being embedded in the process of injection molding the plastic seat, the screw interferes with the buckle structure and has an external thread to be detachably connected with the internal thread of the metal nut through the external thread.

[0005] In a preferred embodiment, the buckle structure comprises two reeds spaced apart from each other, and the diameter of the screw is greater than the free distance between the two reeds.

[0006] In a preferred embodiment, each reed has a buckle width W, and the buckle width W is between 10 mm and 15 mm.

[0007] In a preferred embodiment, each reed has a buckle wall thickness T1, and the buckle wall thickness T1 is between 1.5 mm and 2.5 mm.

[0008] In a preferred embodiment, each reed has a deformed section and an expanded section, wherein the deformed section transitions to the expanded section through a convex portion.

[0009] In a preferred embodiment, the expanded section defines an insertion angle β, and the insertion angle β is 25°±5°.

[0010] In a preferred embodiment, the convex portion defines an engagement amount Y, and the engagement amount Y is between 0.3 mm and 1 mm.

[0011] In a preferred embodiment, the deformation section defines a holding angle a of 75° ± 5°.

[0012] In a preferred embodiment, each leaf has a length of a force arm L of between 6 mm and 10 mm.

[0013] In a preferred embodiment, each leaf has an interference M with the screw of between 0.3 mm and 1 mm.

[0014] The fastening assembly according to the utility model can be disassembled and assembled multiple times, the screw is matched with the metal nut, the buckle structure of the plastic seat can meet the fastening requirements of different plate thicknesses and different materials, the fastening force loss of the fastening assembly is small after multiple disassembling, the performance requirements can still be met after installation, the purpose of multiple disassembly and assembly is achieved, and the number of fasteners used is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is an exploded view of the fastening assembly according to a preferred embodiment of the utility model.

[0016] Figure 2 shows Figure 1 a specific application environment of the fastening assembly.

[0017] Figure 3 is Figure 1 a structural schematic view of the plastic seat of the fastening assembly.

[0018] Figure 4 is Figure 3 a side view of the plastic seat. DETAILED DESCRIPTION

[0019] The preferred embodiments of the utility model will be described in detail below with reference to the drawings.

[0020] As Figure 1 shown, the fastening assembly according to a preferred embodiment of the utility model comprises a fastener 10 and a screw 20, wherein the fastener 10 comprises a plastic seat 11 and a metal nut 12, the metal nut 12 is an insert nut and has an internal thread, the metal nut 12 is fixed in the plastic seat 11 by being embedded in the process of injection molding the plastic seat 11, the screw 20 has an external thread and is detachably connected with the internal thread of the metal nut 12 through the external thread.

[0021] Thus, the screw thread cooperates to provide a fastening force of the fastening assembly. In the prior art, the screw 20 directly matches the plastic seat, and repeated disassembly and assembly causes the plastic hole on the plastic seat to be damaged, resulting in loss of fastening force, attenuation of fastening effect, and frequent replacement of fastening parts. The screw 20 of the utility model matches the metal nut 12, and after being disassembled and assembled for many times, the fastening assembly has small loss of fastening force, and can still meet the performance requirements after being installed, so that the purpose of multiple disassembly and assembly is achieved, and the number of fastening parts used is reduced. For example, the screw in the prior art can only meet the disassembly and assembly requirements for 3-5 times, and after being disassembled and assembled for many times, the function is lost, causing the problem that the fastening parts need to be replaced many times. The utility model can be disassembled and assembled more than 10 times without losing function by adding the metal nut 12 in the plastic seat 11. In the embodiment, the plastic seat 11 is a polyoxymethylene (POM) structure.

[0022] As shown in Figure 2 , the fastening assembly for multiple disassembly and assembly according to the embodiment is used to fasten the second part B on the first part A, wherein the first part A has a first mounting hole penetrating through, the second part B has a second mounting hole penetrating through, and the fastening assembly is installed through the first and second mounting holes. In the embodiment, the plate thickness T of the first part A is 3.2 mm, the first mounting hole is a round hole with a diameter of , and the second mounting hole is a square hole with a size of 15*15. It should be understood that the plate thickness T, the shape and size of the mounting hole here are only examples and not limitations.

[0023] As shown in Figure 2 , the plastic seat 11 has a buckle structure inserted into the first mounting hole to realize clamping, as shown in Figure 3 , the buckle structure includes two spring sheets 111 spaced apart from each other, as shown in Figure 4 , each spring sheet 111 has a buckle width W. In a preferred embodiment, the buckle width W is between 10 mm and 15 mm.

[0024] Returning to Figure 2 , each spring sheet 111 has a buckle wall thickness T1. In a preferred embodiment, the buckle wall thickness T1 is between 1.5 mm and 2.5 mm.

[0025] As shown in Figure 3 , each spring sheet 111 has a deformation section 111a and an outward expansion section 111b, wherein the deformation section 111a transitions to the outward expansion section 111b through a convex part 111c. As shown in Figure 2As shown, the outer expansion section 111b has an insertion angle β with the vertical plane (the insertion direction of the screw 20), the convex section 111c is clamped after passing through the first mounting hole, the convex section 111c has a clamping amount Y with the first part A, and the deformation section 111a is accommodated in the first mounting hole and has a holding angle α with the horizontal plane (the bottom surface of the first part A). In the preferred embodiment, the insertion angle β is 25°±5°, the clamping amount Y is between 0.3mm-1mm, and the holding angle α is 75°±5°.

[0026] As shown, each spring leaf 111 has a force arm length L. In the preferred embodiment, the force arm length L is between 6mm-10mm. Figure 2

[0027] As shown, the diameter of the screw 20 is greater than the free distance between the two spring leaves 111 of the plastic seat 11, and the spring leaf 111 has an interference amount M with the screw 20. In the preferred embodiment, the interference amount M is between 0.3mm-1mm. Figure 2 The assembly process of the fastening assembly of the present application which can be disassembled multiple times is briefly described as follows. The plastic seat 11 is first threaded through the second part B and pre-assembled on the first part A by clamping with the buckle structure. The screw 20 is assembled on the plastic seat 11 by threadedly connecting with the metal nut 12. As the screw 20 is inserted, the interference amount M gradually increases and then remains unchanged, causing the outer expansion section 111b of the plastic seat 11 to expand outward, changing the clamping amount Y of the convex section 111c with the first part A and the holding angle α of the deformation section 111a, thereby generating a large holding force to complete the fastening. When disassembling, the screw 20 is first removed, changing the interference amount M, the clamping amount Y, and the holding angle α of the plastic seat 11, so that when the plastic seat 11 is disassembled, the buckle structure has a deformation space, and the disassembly can be completed with a small disassembly force.

[0028] By adjusting the relevant parameters of the buckle structure, such as the buckle width W, the buckle wall thickness T1, the insertion angle β, the clamping amount Y, the holding angle α, the force arm length L, or the interference amount M, the fastening assembly according to the present application can be matched with different plate thicknesses T (1.5mm-3.2mm) and different materials (plastic, sheet metal, etc.) of the first part A, and after multiple disassembly and assembly, the assembly force and holding force requirements can still be met.

[0029] In the prior art, the plastic seat cannot be used for parts of different plate thicknesses and different materials, so multiple fasteners are required, causing problems in fastener management. The buckle structure of the plastic seat 11 of the present application can meet the fastening requirements of different plate thicknesses and different materials, reducing the types of fasteners used, and saving the number and cost of fasteners used.

[0030]

[0031] ​​The above merely describes preferred embodiments of the present application, and is not intended to limit the scope of the present application, and the above embodiments of the present application can be variously changed. That is, simple, equivalent changes and modifications made according to the content of the claims and the specification of the present application fall within the scope of the claims of the present application. The present application is not described in detail, and is conventional technical content.

Claims

1. A fastening assembly that can be repeatedly disassembled, characterized by, The fastening assembly comprises a fastener and a screw, wherein the fastener comprises a plastic seat and a metal nut, the plastic seat has a buckle structure, the metal nut is an insert nut and has an internal thread, the metal nut is fixed in the plastic seat by embedding the metal nut in the process of injection molding the plastic seat, the screw interferes with the buckle structure and has an external thread to be detachably connected with the internal thread of the metal nut through the external thread.

2. The fastening assembly of claim 1, wherein, The buckle structure comprises two springs spaced apart from each other, and the diameter of the screw is greater than the free distance between the two springs.

3. The fastening assembly of claim 2, wherein, Each spring has a buckle width W, and the buckle width W is between 10 mm and 15 mm.

4. The fastening assembly of claim 2, wherein, Each spring has a buckle wall thickness T1, and the buckle wall thickness T1 is between 1.5 mm and 2.5 mm.

5. The fastening assembly of claim 2, wherein, Each spring has a deformation section and an expansion section, wherein the deformation section transitions to the expansion section through a convex part.

6. The fastening assembly of claim 5, wherein, The expansion section defines an insertion angle β, and the insertion angle β is 25°±5°.

7. The fastening assembly of claim 5, wherein, The convex part defines a clamping amount Y, and the clamping amount Y is between 0.3 mm and 1 mm.

8. The fastening assembly of claim 5, wherein, The deformation section defines a holding angle α, and the holding angle α is 75°±5°.

9. The fastening assembly of claim 2, wherein, Each spring has a force arm length L, and the force arm length L is between 6 mm and 10 mm.

10. The fastening assembly of claim 2, wherein, Each spring has an interference amount M with the screw, and the interference amount M is between 0.3 mm and 1 mm.

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