Embedded nut structure of injection molding part

Abstract

The utility model relates to the technical field of injection molding accessories, in particular to an embedded nut structure of an injection molding part, which comprises a through hole nut, a through hole nut and an embedded nut, the insulating cover sleeves the lower end of the through hole nut, and one end, far away from the through hole nut, of the insulating cover is closed; the injection molding shell is injection-molded on the side surface of the through hole nut and / or the insulating cover; according to the utility model, the upper end of the through hole nut is fixedly connected with the busbar, and the lower end is sleeved with the insulating cover and then is fixed by injection molding to pre-embed the nut in the injection molding shell, so that the metal material of the nut can be effectively saved, and the length dimension of the whole pre-embedded nut structure can be shortened on the premise of meeting the safety requirements; therefore, the embedded nut structure can be applied to the situation that the installation space is limited, and the applicability is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding accessories, in particular to an injection molding part embedded nut structure. Background Art

[0002] One-piece injection molding of connectors has the advantages of good quality, high precision and low cost, and is widely used in home appliances and new energy vehicles. In one-piece injection molded connectors, embedded nuts that play a role in connecting and fixing are an indispensable part.

[0003] In order to prevent the metal debris generated by the friction between the bolt and the nut from falling when tightening the bolt, the bottom of the nut is usually required to be closed. At present, the structural design of the blind hole nut is usually adopted in the market. In order to meet the safety requirements of the bottom of the nut and other metal parts, the bottom of the blind hole nut needs to be plastic coated, and the metal shell of the nut is not allowed to be exposed. However, such a design has the following problems:

[0004] One is that due to the limitation of the processing technology of blind hole nuts, the effective tooth depth only accounts for about 70% of the total length of the blind hole nut, and the lower part of the blind hole nut is not utilized, resulting in material waste;

[0005] Secondly, the height of the embedded blind hole nut structure is the sum of the effective tooth depth a, the unused part b and the plastic-coated bottom layer c (refer to Figure 1 As shown), this existing structural design cannot be used when the installation space is limited. Utility Model Content

[0006] In order to achieve the above object, the utility model provides an injection molded part embedded nut structure, comprising:

[0007] A through-hole nut, the upper end of which is fixedly connected to the busbar;

[0008] An insulating cover, which is sleeved on the lower end of the through-hole nut, and the insulating cover is sealed at one end away from the through-hole nut;

[0009] The injection-molded housing is injection-molded on the side surface of the through-hole nut and / or the insulating cover.

[0010] In some possible embodiments, the inner wall of the insulation cover is provided with a step capable of supporting the through-hole nut, and the distance between the step and the upper end surface of the insulation cover is smaller than the height of the through-hole nut.

[0011] In some possible embodiments, an inner diameter of the insulating cover is larger than an inner diameter of the through-hole nut and smaller than an outer diameter of the through-hole nut.

[0012] In some possible embodiments, a flange extending horizontally outward is formed on the upper end surface of the insulation cover.

[0013] In some possible embodiments, a riveting flange is formed on the upper end of the through hole nut, and the through hole nut is fixed to the busbar by pressure riveting.

[0014] In some possible embodiments, a knurled structure is formed on a side surface of the through-hole nut in contact with the injection-molded housing and / or a side surface of the insulation cover.

[0015] In some possible embodiments, a depth dimension of the insulating cover is equivalent to a length of the screw that is screwed into and passes through the through-hole nut.

[0016] Compared with the prior art, the beneficial effect of the utility model is that the utility model fixes the busbar at the upper end of the through-hole nut, and the lower end is sleeved with an insulating cover and then fixed by injection molding to embed the nut in the injection-molded shell, which can effectively save the metal material of the nut and shorten the length of the entire embedded nut structure while meeting safety requirements, so that the embedded nut structure of the utility model can be used in situations where the installation space is limited, and has a wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A cross-sectional schematic diagram of an existing injection molded embedded nut structure provided in an embodiment of the utility model;

[0019] Figure 2 A three-dimensional structural section of the injection molded embedded nut structure provided in the embodiment of the utility model Figure 1 ;

[0020] Figure 3 A three-dimensional structural section of the injection molded embedded nut structure provided in the embodiment of the utility model Figure 2 .

[0021] Figure numerals: effective tooth depth a of blind hole nut, height b of unused part, height c of plastic-coated bottom layer, busbar 1, blind hole nut 2, injection molded shell 3, through hole nut 4, riveted flange 41, insulating cover 5, step 51, flange 52, knurled structure 53. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Reference Figure 2 and Figure 3 An injection molded part embedded nut structure is shown, which includes a through hole nut 4, an insulating cover 5 and an injection molded shell 3. The upper end of the through hole nut 4 is fixedly connected to the busbar 1, and the lower end is sleeved with the insulating cover 5, and the insulating cover 5 is closed at one end away from the through hole nut 4, and then the injection molded shell 3 is injection molded on the side surface of the through hole nut 4 and / or the side surface of the insulating cover 5. Such a structure eliminates the unused part of the blind hole nut, effectively reduces the metal material of the embedded nut structure of the injection molded shell 3, and can shorten the height from the busbar 1 to the insulating cover 5, so that the structure of the utility model can be applied to some situations where the installation space is limited.

[0024] It should be noted that the attached Figure 2 and 3 The pre-embedded nut structures of the injection molded shell 3 are all two nut structures set on the injection molded shell 3. In order to clearly explain and save the length of the specification, the utility model uses one of the nuts on the pre-embedded nut structure of the injection molded shell 3 as a cross-sectional diagram of the structures before assembly, and the other nut as a cross-sectional diagram after assembly.

[0025] In some possible embodiments, the inner wall of the insulating cover 5 is provided with a step 51 that can support the through hole nut 4, and the distance between the step 51 and the upper end surface of the insulating cover 5 is smaller than the height of the through hole nut 4, that is, the through hole nut 4 can be placed on the step 51 and protrude from the upper end surface of the insulating cover 5, so that the side surface of the through hole nut 4 is partially exposed and in contact with the injection molded shell 3, ensuring that the through hole nut 4 can be fixedly connected to the injection molded shell 3 after injection molding to offset the force applied when the stud is screwed in.

[0026] In some possible embodiments, the inner diameter of the insulating cover 5 is larger than the inner diameter of the through hole nut 4 and smaller than the outer diameter of the through hole nut 4, so as to ensure that the screw can pass through the through hole nut 4 and be accommodated in the insulating cover 5 when being screwed in. Furthermore, the depth of the insulating cover 5 is equivalent to the length of the screw that is screwed in and passes through the through hole nut 4, so as to ensure that there is enough space in the insulating cover 5 to accommodate the screw, and the closed insulating cover 5 can ensure that the screw is not exposed after being screwed in, thereby meeting safety requirements.

[0027] In some possible embodiments, a flange 52 extending horizontally outward is formed on the upper end surface of the insulation cover 5. Such a flange 52 structure can form an undercut after injection molding to enhance the connection strength between the insulation cover 5 and the injection-molded shell 3 and prevent the insulation cover 5 from falling out due to external force.

[0028] In some possible embodiments, reference Figure 2 As shown, a rivet flange 41 is formed at the upper end of the through hole nut 4, and the through hole nut 4 is first fixed to the busbar 1 by means of the rivet flange 41, and then the insulating cover 5 is sleeved on the lower end of the through hole nut 4 to form an assembly, and then the assembly is placed in the mold cavity, with the upper end surface of the through hole nut 4 / busbar 1 and the bottom of the insulating cover 5 as supports for the mold to ensure the sealing inside the through hole nut 4 and the insulating cover 5, and then the product is injection molded.

[0029] In some possible embodiments, a knurled structure 53 is formed on the side surface of the through hole nut 4 in contact with the injection molded shell 3 and / or the side surface of the insulating cover 5. The knurled structure 53 enhances the connection strength between the through hole nut 4 / insulating cover 5 and the injection molded shell 3, thereby effectively preventing the through hole nut 4 from rotating due to the screw being screwed in and the insulating cover 5 from falling off due to external force.

[0030] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An injection molded part embedded nut structure, characterized in that: include: A through-hole nut (4), the upper end of which is fixedly connected to the busbar (1); An insulating cover (5) is sleeved on the lower end of the through-hole nut (4), and the insulating cover (5) is closed at one end away from the through-hole nut (4); The injection-molded housing (3) is injection-molded on the side surface of the through-hole nut (4) and / or the insulating cover (5).

2. The pre-embedded nut structure of an injection molded part according to claim 1, characterized in that: The inner wall of the insulating cover (5) is provided with a step (51) capable of supporting the through-hole nut (4), and the distance between the step (51) and the upper end surface of the insulating cover (5) is smaller than the height of the through-hole nut (4).

3. The pre-embedded nut structure of an injection molded part according to claim 1 or 2, characterized in that: The inner diameter of the insulating cover (5) is larger than the inner diameter of the through-hole nut (4) and smaller than the outer diameter of the through-hole nut (4).

4. The pre-embedded nut structure of an injection molded part according to claim 1, characterized in that: The upper end surface of the insulating cover (5) is formed with a flange (52) extending horizontally outward.

5. The pre-embedded nut structure of an injection molded part according to claim 1, characterized in that: The upper end of the through-hole nut (4) is formed with a riveting flange (41), and the through-hole nut (4) is fixed to the busbar (1) by pressure riveting.

6. The pre-embedded nut structure of an injection molded part according to claim 1, characterized in that: A knurled structure (53) is formed on the side surface of the through-hole nut (4) in contact with the injection-molded housing (3) and / or the side surface of the insulating cover (5).

7. The pre-embedded nut structure of an injection molded part according to claim 1, characterized in that: The depth dimension of the insulating cover (5) is equivalent to the length of the screw that is screwed into and passes through the through-hole nut (4).

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