Embedded injection molding matching waterproof plug structure and wire harness connector

Abstract

The utility model discloses a pre-embedded injection molding matching waterproof plug structure and a wire harness connector, and belongs to the field of automobile wire harness accessories, the pre-embedded injection molding matching waterproof plug structure is used for a wire harness, the top end of a plugging end of the pre-embedded injection molding matching waterproof plug structure is integrally provided with a limiting end and a plugging end, a wire plugging hole penetrates through the limiting end, an injection molding notch is machined downwards from the top end face of the limiting end, and the injection molding notch extends to the plugging end. A terminal is arranged in the plug-in connector and connected with a wire in the wire harness, a plug body containing cavity for containing the waterproof plug is formed in the tail end of the plug-in connector, the injection molding end, formed through injection molding, of the waterproof plug is in interference fit with the plug body containing cavity, and the injection molding end, formed through injection molding, of the wire is in interference fit with a wire plug-in hole. And the contact part of the wire harness and the injection molding end is injection-molded into a whole. According to the wire harness connector, rapid assembly between the waterproof plug and the wire and between the waterproof plug and the plug-in connector and conversion of the assembly relation can be achieved, the waterproof performance of the wire harness connector is guaranteed, meanwhile, the machining and assembling difficulty is lowered, and the production efficiency and quality of products can be improved.

Description

Technical Field

[0001] The present application belongs to the field of automotive wiring harness accessories, and more specifically, relates to a pre-buried injection-molded matching waterproof plug structure and a wiring harness connector. Background Art

[0002] In the overall structure of the vehicle, the wiring harness can realize the transmission of different signals in the vehicle and realize the functions required by the vehicle. In the wiring harness structure, the wiring harness connector can realize the connection and signal transmission between different wiring harnesses, and the waterproof treatment at the connection position of the tail end of the wiring harness can ensure the stability of the mechanical and electrical performance inside the wiring harness connector.

[0003] In order to improve the protection function and tensile strength of the wiring harness at the wiring harness connector position, more and more wiring harness connectors are connected to the wiring harness by pre-embedded injection molding. Pre-embedded injection molding requires a matching waterproof plug to ensure waterproof and sealing functions. Figure 6 The waterproof plug and the plug body cavity of the connector, as well as the wire and the waterproof plug, are all interference fit, which makes the assembly between the two difficult, affecting the assembly efficiency and quality. At the same time, during the injection molding process, the waterproof plug is prone to large compression deformation due to its own structure and material limitations, which can lead to the loss of waterproof function in severe cases.

[0004] Secondly, referring to the patent document with Chinese patent publication number CN210957101U, a sealing plug for injection molding and a connector thereof are disclosed, which include a flange, two or more sealing cylinders are arranged in the length direction of the flange, the sealing cylinder is processed with a sealing section, a guide section and a support section respectively with the flange as the starting point, and the sealing section, the guide section and the support section are an integrated structure; a socket is processed at the central axis of the sealing cylinder, and the socket passes through the sealing cylinder and the flange; the sealing section is a cylinder with an outer diameter greater than the outer diameter of the support section, and the guide section is a frustum-shaped structure.

[0005] In the above structure, the function of the sealing section is to form an interference fit with the hole in the connector, and the pressure generated by radial compression plays the role of offsetting the injection pressure and sealing. As in the previous paragraph, the interference fit makes assembly difficult, while the use of non-interference fit is likely to cause the sealing function and the function of offsetting the injection pressure to fail. Summary of the invention

[0006] The purpose of the present application is to provide a pre-embedded injection-molded matching waterproof plug structure and a wiring harness connector, which can realize the rapid assembly and transformation of the assembly relationship between the waterproof plug and the wire, and the waterproof plug and the connector, while ensuring the waterproof performance of the wiring harness connector, reducing the difficulty of processing and assembly, and helping to improve the production efficiency and quality of the product.

[0007] To achieve the above objectives, this application is implemented through the following technical solutions:

[0008] A pre-embedded injection-molded matching waterproof plug structure described in the present application includes a plug-in end, a limiting end is integrally arranged at the top end of the plug-in end, a wire plug-in hole is passed through the plug-in end and the limiting end, an injection molding groove is processed downward from the top end face of the limiting end in the circumferential direction of the wire plug-in hole, the injection molding groove extends to the plug-in end, and the bottom end of the injection molding groove is located inside the plug-in end.

[0009] As one of the preferred technical solutions of the present application, the injection molding notch forms a wire plug-in tube at the position of the wire plug-in hole.

[0010] As one of the preferred technical solutions of the present application, the cross-section of the injection molding notch gradually becomes smaller in the process of extending from the top end surface of the limiting end to the inside of the plug-in end.

[0011] As one of the preferred technical solutions of the present application, when the plug end extends in a direction away from the limiting end, the orthographic projection of the cross section of the plug end on the horizontal plane gradually becomes smaller.

[0012] As one of the preferred technical solutions of the present application, the plug-in end and the limit end are made of PVC material with a hardness of more than 75.

[0013] A wiring harness connector includes a plug connector, the plug connector has terminals inside, the terminals are connected to the wires in the wiring harness, the plug connector has a plug body placement cavity for placing a waterproof plug at the rear end, the structure of the waterproof plug is the pre-buried injection molded matching waterproof plug structure, the injection molded end of the waterproof plug formed by injection molding has an interference fit with the plug body placement cavity, the injection molded end of the wire formed by injection molding has an interference fit with the wire plug-in hole, and the part where the wiring harness contacts the injection molded end is injection molded as a whole.

[0014] As one of the preferred technical solutions of the present application, the injection molding end can be formed in the injection molding notch in the waterproof plug during injection molding.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] 1. The present application modifies the wire and the wire plug-in hole, the plug-in end and the plug body placement cavity into a clearance fit, and transforms it into an interference fit structure during the injection molding process of the injection molding end. This not only effectively realizes the waterproof function of the connector, but also effectively reduces the difficulty of assembling the wire and the waterproof plug, the waterproof plug and the plug body placement hole, thereby improving the assembly efficiency of the wiring harness connector.

[0017] 2. The waterproof plug described in this application, through the improvement of its own structure, is convenient for rapid assembly with the connector and the wire, reduces the difficulty of assembly, and ensures the waterproof performance of the wiring harness connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the pre-embedded injection-molded matching waterproof plug structure described in Example 1.

[0019] Figure 2 This is a diagram of the internal structure of the wiring harness connector in Example 2 (excluding some of the wires extending from behind the waterproof plug, the plug terminals, etc.).

[0020] Figure 3 3D is a perspective view of the wiring harness connector described in Example 2.

[0021] Figure 4 It is a stereoscopic view of the wiring harness connector described in Example 2 after removing the injection molded end.

[0022] Figure 5 This is a three-dimensional diagram of the wiring harness and the waterproof plug in Example 2 (removing part of the wires extending from behind the waterproof plug).

[0023] Figure 6 The utility model is a structural schematic diagram of a waterproof plug and a connector in the prior art.

[0024] In the figure: 1. Wire harness; 2. Injection molding end; 3. Wire; 4. Waterproof plug; 5. Plug body placement cavity; 6. Connector; 7. Plug end; 8. Limit end; 9. Wire plug hole; 10. Wire plug tube; 11. Injection molding notch; 12. Limit end slot. DETAILED DESCRIPTION

[0025] The technical solution described in this application is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, a pre-buried injection-molded matching waterproof plug structure includes an integrated structure consisting of a plug-in terminal 7 and a limit terminal 8, wherein the plug-in terminal 7 is arranged according to the number of wires 3, and the integrated structure consisting of the plug-in terminal 7 and the limit terminal 8 penetrates a wire plug-in hole 9, and an injection-molded notch 11 is arranged at a circumferential position where the wire plug-in hole 9 is processed, and the injection-molded notch 11 extends from the end surface of the limit terminal 8 toward the direction where the plug-in terminal 7 is located, and during the extension process, the orthographic projection area of ​​the transverse section of the injection-molded notch 11 on the horizontal plane gradually decreases; the injection-molded notch 11 forms a wire plug-in tube 10 at the location of the wire plug-in hole 9.

[0028] The plug-in end 7 is a tapered tube. The limit end 8 is processed with a limit end groove 12 at a position between adjacent plug-in ends 7 to increase the contact area with the injection end 2 and ensure the stability of the limit end 8 during the injection molding process.

[0029] Example 2

[0030] like Figures 2 to 5 As shown, a wiring harness connector includes a connector 6, which is electrically connected to the wire 3 in the wiring harness 1. The wiring harness 1 passes through the wire plugging holes 9 of the waterproof plug 4 through the wire 3, and the matching relationship between the wire 3 and the wire plugging hole 9 is a clearance fit; the waterproof plug 4 is placed in the plug body placement cavity 5 of the connector 6, and the matching relationship between the waterproof plug 4 and the plug body placement cavity 5 is a clearance fit; the connector 6 is injection molded at the end where the waterproof plug 4 is installed to form an injection molding end 2, and the injection molding body used in the injection molding end 2 enters the injection molding slot 11 during the injection molding process and squeezes the wire plug tube 10 and the plugging end 7.

[0031] The waterproof plug 4 is made of PVC material with a hardness of more than 75.

[0032] The processing method of the wiring harness connector described in the above embodiment comprises the following steps:

[0033] Step 1: The wires 3 in the wiring harness 1 are respectively passed through the wire plug holes 9 of the waterproof plug 4 and then extended out, and are electrically connected to the connector 6;

[0034] Step two, place the waterproof plug 4 into the plug body placement cavity 5, the plug-in end 7 of the waterproof plug 4 extends into the plug body placement cavity 5, the limiting end 8 of the waterproof plug 4 overlaps the end face of the plug body placement cavity 5, the wiring harness 1, the waterproof plug 4, and the connector 6 form a combination, at this time, the plug-in end 7 and the plug body placement cavity 5 are gap matched, and the wire 3 and the wire plug-in hole 9 are gap matched.

[0035] Step three, put the assembly formed in step two into the mold of the injection molding machine, and use the injection molding machine to form an injection molding end 2 that covers the connector 6, the wiring harness 1, and the waterproof plug 4 at the end of the connector 6; the injection molding body used in the injection molding end 2 enters the injection molding slot 11 and extrude the wire plug tube 10 and the plug terminal 7 through the injection molding body; the plug terminal 7 and the plug body placement cavity 5 form an interference fit during the extrusion process; the wire plug tube 10 forms an interference fit with the wire plug hole 9 and the wire 3 during the extrusion process of the injection molding body.

[0036] Step 4: Take out the wire harness connector after injection molding.

[0037] Based on the above embodiments, the following paragraphs will continue to describe in detail the technical features involved and the functions and roles played by the technical features in the present technical solution, so as to help technicians in this field to fully understand the technical solution and reproduce it.

[0038] In the present application, the waterproof plug 4 should be made of materials that are currently available on the market and can withstand injection molding pressure and injection molding high temperature, such as PVC material with a hardness of more than 75, to ensure that the waterproof plug 4 will not melt, severely deform, or other problems during the injection molding process.

[0039] In the present application, the waterproof plug 4 includes a plug-in end 7 extending into the plug body placement cavity 5, and the cross-sectional projection area of ​​the plug-in end 7 on the horizontal plane gradually decreases in the length direction away from the limit end 8, and the end face of the plug-in end 7 away from the limit end 8 is a plane.

[0040] The top of the plug end 7 is connected to the limit end 8 as a whole, and the plug end 7 is multiple and reasonably arranged according to the number of wires 3. A step structure is formed between the plug end 7 and the limit end 8 for the limit end 8 to overlap, and the step structure satisfies the limit end 8 to overlap the end of the connector 6 (i.e., the end face where the plug body placement cavity 5 is located).

[0041] The injection molding end 2 is formed by injection molding by an injection molding machine. During the injection molding process of the injection molding end 2, the injection molding body used can enter the interior of the limit end 8 and the plug end 7 through the injection molding notch 11, so that during the injection molding process, with the help of the injection molding pressure of the injection molding machine, the clearance fit between the plug end 7 and the plug body placement cavity 5 is transformed into an interference fit, and the fitting mode between the wire plug hole 9 and the wire 3 is changed from a clearance fit to an interference fit, and the wiring harness 1, the waterproof plug 4, and the connector 6 are formed into an integrated structure through the injection molding end 2, thereby ensuring the waterproof function of the connector 6 at the connection position with the wiring harness 1.

[0042] In the present application, the combination formed by the initial assembly, for example, the matching of the wire 3 and the wire plug hole 9 adopts a clearance fit, and the matching of the waterproof plug 4 and the plug body placement cavity 5 adopts a clearance fit. The clearance fit can improve the assembly efficiency and reduce the difficulty of assembly.

[0043] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A pre-buried injection-molded matching waterproof plug structure, comprising a plug-in end (7), characterized in that: The top end of the plug end (7) is integrally provided with a limit end (8), and a wire plug hole (9) is formed through the plug end (7) and the limit end (8). An injection molding notch (11) is processed downward from the top end surface of the limit end (8) in the circumferential direction of the wire plug hole (9), and the injection molding notch (11) extends to the plug end (7), and the bottom end of the injection molding notch (11) is located inside the plug end (7).

2. The pre-buried injection-molded matching waterproof plug structure according to claim 1, characterized in that: The injection molding notch (11) forms a wire plug-in tube (10) at the location of the wire plug-in hole (9).

3. The pre-buried injection-molded matching waterproof plug structure according to claim 1, characterized in that: The cross section of the injection molding notch (11) gradually becomes smaller in the process of extending from the top end surface of the limiting end (8) toward the inside of the plug-in end (7).

4. The pre-buried injection-molded matching waterproof plug structure according to claim 1, characterized in that: When the plug end (7) extends in a direction away from the limiting end (8), the orthographic projection of the cross section of the plug end (7) on the horizontal plane gradually becomes smaller.

5. A pre-buried injection-molded matching waterproof plug structure according to any one of claims 1 to 4, characterized in that: The plug-in end (7) and the limit end (8) are made of PVC material with a hardness of more than 75.

6. A wiring harness connector, comprising a plug connector (6), wherein the plug connector (6) has a terminal inside, the terminal is connected to the wire (3) in the wiring harness (1), and the plug connector (6) has a plug body placement cavity (5) at the rear end for placing a waterproof plug (4), characterized in that: The structure of the waterproof plug (4) is the pre-buried injection-molded matching waterproof plug structure as described in any one of claims 1 to 5, wherein the injection-molded end (2) of the waterproof plug (4) is formed by injection molding and has an interference fit with the plug body placement cavity (5), the injection-molded end (2) of the wire (3) is formed by injection molding and has an interference fit with the wire plug-in hole (9), and the contact portion of the wiring harness (1) and the injection-molded end (2) is injection-molded as a whole.

7. A wiring harness connector according to claim 6, characterized in that: The injection molding end (2) can be formed in the injection molding notch (11) in the waterproof plug (4) during injection molding.

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