Waterproof protection device for automobile wire harness parallel connection point

Abstract

The utility model relates to a waterproof protection device for an automobile wire harness parallel connection point, which comprises at least two wire harnesses which need to be electrically connected, and at least one wire harness comprises more than or equal to 2 and less than or equal to 4 outgoing wires. The cross-shaped hot melt adhesive tape is arranged at the parallel connection point of the wire harness, fork openings of the cross-shaped hot melt adhesive tape respectively contain the outgoing wires, each fork opening limits one outgoing wire, the length of the cross-shaped hot melt adhesive tape is 6-15mm, and the distance between the cross-shaped hot melt adhesive tape and the center of the parallel connection point terminal is not more than 10mm; the heat shrink tube is a double-wall adhesive heat shrink tube, the length of the single parallel connection point heat shrink tube is larger than or equal to 60 mm, the wrapping length of the single-side wire outlet end is larger than or equal to 15 mm, the double-wall inner adhesive transparent shrinkage rate of the double-wall adhesive heat shrink tube is 4: 1, and excessive adhesive sealing layers are formed at the two ends of the double-wall adhesive heat shrink tube. According to the utility model, gaps between wires can be filled accurately, and the waterproof performance of the parallel connection point of the automobile wire harness is greatly improved by combining the double-sealing effect of the double-wall adhesive heat shrink tube, so that the stable operation of an automobile electrical system is ensured.

Description

Technical Field

[0001] This utility model relates to a protective device for automotive wiring harnesses, specifically a waterproof protective device for automotive wiring harness parallel connections. Background Technology

[0002] In the automotive wiring harness field, the waterproof performance of wiring harness joints is crucial. Traditionally, when multiple wires are connected in parallel (especially when there are two or more wires on the left or right side of the joint), double-walled adhesive heat shrink tubing is often used. This is achieved by heat shrinking the tubing with a heat gun or heat shrink tubing heater, causing the internal hot melt adhesive to melt and overflow into the wire gaps. However, in practice, it has been found that when there are many wires on one side, the hot melt adhesive from the double-walled adhesive heat shrink tubing cannot guarantee that it will overflow into all wire gaps, including the gaps between wires and between wires and the heat shrink tubing. This results in the wiring joint being exposed to the external environment, significantly reducing the waterproof effect of the wire harness after connection. Secondly, improper selection of filler materials can easily lead to heat shrinkage deformation and displacement. Unscientific control of heat shrink tubing offset can lead to insufficient sealing on one side. Furthermore, a lack of surface conversion process parameters results in unstable waterproof performance. During driving, vehicles may encounter various harsh environments, such as rain and car wash water. If the joint is not waterproof, the wire cores are easily corroded, causing short circuits and other faults, seriously affecting the stability and safety of the vehicle's electrical system. Therefore, there is an urgent practical need to develop a device or method that can effectively improve the waterproof performance of automotive wiring harnesses and contacts. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a waterproof protection device for automotive wiring harness parallel connections that fully fills the gaps between wires, improves the waterproof performance of automotive wiring harness parallel connections, and ensures the stable operation of automotive electrical systems.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a waterproof protection device for automotive wiring harness parallel connection, including at least two wiring harnesses that need to be electrically connected, wherein at least one wiring harness contains ≥2 and ≤4 wires.

[0005] A cross-shaped hot melt adhesive strip is installed at the junction of the wire harness. Its forks accommodate each wire and each fork is limited to one wire. The length of the cross-shaped hot melt adhesive strip is between 6-15mm, and the distance between the cross-shaped hot melt adhesive strip and the center of the junction terminal does not exceed 10mm.

[0006] The heat shrink tubing covers the cross-shaped hot melt adhesive strip and the joint point. The ends of the two wire harnesses near the electrical connection position are respectively inserted into the heat shrink tubing from both ends of the axial direction. The heat shrink tubing is a double-walled adhesive heat shrink tubing. The length of the heat shrink tubing at a single joint point is ≥60mm and the wire exit end on one side maintains a coverage length of ≥15mm. The double-walled adhesive heat shrink tubing has a double-walled inner adhesive transparent shrinkage ratio of 4:1, and an overflow adhesive sealing layer is formed at both ends.

[0007] Preferably, when the number of outgoing wires is ≥2 and <4, the empty forks of the cross-shaped hot melt adhesive strip are arranged close to the side with the thicker wire diameter.

[0008] Preferably, if the wires at both ends of the joint are many-to-many, the crimping point of the heat shrink tubing after heat shrinking is located in the middle of the heat shrink tubing; if the wires at both ends of the joint are one-to-many, the heat shrink tubing is offset 5-10mm towards the single-sided multi-wire end.

[0009] Preferably, the two wire harnesses are electrically connected by a parallel terminal or by ultrasonic welding.

[0010] Preferably, the heat shrink tubing specifications are matched to the wire diameter and quantity.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. Significantly improves waterproof performance: By adding cross-shaped hot melt adhesive strips to fill the gaps between wires at the junction points, and combining this with the double sealing effect of double-walled adhesive heat shrink tubing, the problem that traditional heat shrink tubing hot melt adhesive cannot completely fill the gaps when there are many wires on one side is effectively solved. This greatly improves the waterproof performance of automotive wiring harness junction points, effectively resisting the intrusion of liquids such as rainwater and car wash water, protecting the wire cores, reducing the probability of short circuits and other faults, and ensuring the stable operation of the automotive electrical system.

[0013] 2. Standardized installation procedures: The parameters, installation positions, and methods of the cross-shaped hot melt adhesive strip and heat shrink tubing have been clearly defined and standardized. For example, the length of the cross-shaped hot melt adhesive strip, the rules for placing the wires at the cross joints, the distance from the center of the terminal, the length and specifications of the heat shrink tubing, and the requirements for the position after heat shrinking are all specified. This makes the installation of the entire waterproof protection device a standardized process, which is easy for production and installation personnel to master quickly, thereby improving production efficiency and the stability of installation quality.

[0014] 3. Improved product stability and safety: Excellent waterproof performance allows automotive wiring harnesses to operate stably in various harsh environments, extending their lifespan and reducing the frequency and cost of vehicle repairs due to wiring harness failures. Simultaneously, it reduces the risk of safety accidents such as fires caused by wiring harness short circuits, thus improving vehicle safety.

[0015] 4. Strong compatibility: It can adapt to scenarios with 2-4 wires connected in parallel, meeting the needs of different wire diameter combinations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-shaped hot melt adhesive strip structure in this utility model;

[0017] Figure 2 This is a perspective view of the three-dimensional structure of this utility model. Detailed Implementation

[0018] The following will combine Figure 1-2 The present invention will be described in detail below. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0019] A waterproof protection device for parallel connection of automotive wiring harnesses, comprising at least two wiring harnesses 2 that need to be electrically connected, wherein at least one wiring harness contains ≥2 and ≤4 wires, and the two wiring harnesses are electrically connected by parallel terminals or ultrasonic welding.

[0020] A cross-shaped hot melt adhesive strip 1 is installed at the junction of the wire harness. Its forks accommodate each wire, and each fork is limited to one wire. When the number of wires is ≥2 and <4, the empty forks of the cross-shaped hot melt adhesive strip are arranged close to the side with the thicker wire diameter. The forks are used to accurately separate each wire and eliminate gaps between wires. The length of the cross-shaped hot melt adhesive strip is between 6-15mm to avoid excessive glue overflow that would cause the wires to stick together. The distance between the cross-shaped hot melt adhesive strip and the center of the junction terminal shall not exceed 10mm.

[0021] Heat shrink tubing 3, covered with a cross-shaped hot melt adhesive strip and joint points. The ends of the two wire harnesses near the electrical connection points are inserted into the heat shrink tubing from both ends of the axial direction. The heat shrink tubing is a double-walled adhesive heat shrink tubing. The length of the heat shrink tubing at a single joint point is ≥60mm and the wire exit end on one side maintains a coverage length of ≥15mm. The double-walled adhesive inner adhesive of the heat shrink tubing has a transparent shrinkage ratio of 4:1, and an overflow adhesive sealing layer is formed at both ends. The specific specifications of the heat shrink tubing are selected according to the wire diameter and quantity.

[0022] Furthermore, after heat shrinking, if the wires at both ends of the joint are many-to-many, the crimping point of the heat shrink tubing after heat shrinking is located in the middle of the heat shrink tubing; if the wires at both ends of the joint are one-to-many, the heat shrink tubing is offset 5-10mm towards the single-wire end, the single-wire end on one side maintains a coverage length of ≥15mm, there are no air bubbles inside the heat shrink tubing, there is obvious excess adhesive at both ends, and the wires are not burned.

[0023] During implementation, first install a cross-shaped hot melt adhesive strip at the joint of the automotive wiring harness wires. The strip should be 6-15mm long to effectively fill the gaps between the wires without causing excessive adhesive to cause them to stick together. Place the wires into the forks of the cross-shaped hot melt adhesive strip. If there are fewer than four wires, place the empty forks closer to the side with the thicker wire diameter, ensuring the distance between the cross-shaped hot melt adhesive strip and the center of the joint terminal is no more than 10mm. When the heat shrink tubing is heated, the heat is transferred to the cross-shaped hot melt adhesive strip, causing it to melt. The melted hot melt adhesive quickly fills the tiny gaps between the wires, forming a preliminary waterproof seal.

[0024] Next, select double-walled, adhesive-backed heat shrink tubing with a length of at least 60mm and specifications suitable for the wire diameter and quantity. Slide this tubing over the joint and the wire harness where the cross-shaped hot melt adhesive strip has already been installed. Heat the heat shrink tubing using a heat gun or heat shrink tubing heater. The tubing will shrink upon heating, tightly wrapping the wire harness and joint. Simultaneously, the hot melt adhesive layer on the inner wall of the heat shrink tubing melts, filling the gap between the tubing and the outer surface of the wire harness, and fusing with the melted cross-shaped hot melt adhesive strip to further enhance the sealing effect. After heat shrinking, for joints with different wire exit points (e.g., many to many), the crimp point is located in the middle of the heat shrink tubing; for one to many, the heat shrink tubing is offset 5-10mm towards the multiple exit points, ensuring that the heat shrink tubing length at each wire end is at least 15mm, with no air bubbles inside the tubing, noticeable excess adhesive at both ends, and no burns to the wires. This achieves a comprehensive, multi-layered waterproof seal.

[0025] The wire harnesses treated according to the design requirements of this waterproof protection device meet the wet area contact immersion test requirements of clause 5.5.4 in the national standard QC / T29106-2014 "Technical Conditions for Automotive Wiring Harnesses", proving the reliability and effectiveness of the device in practical applications.

[0026] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A waterproof protection device for automotive wiring harness parallel contacts, characterized in that: At least two wire harnesses (2) that need to be electrically connected, wherein at least one of the wire harnesses contains ≥2 and ≤4 wires; A cross-shaped hot melt adhesive strip (1) is set at the wire harness connection point. Its forks accommodate each wire and each fork is limited to one wire. The length of the cross-shaped hot melt adhesive strip is between 6-15mm, and the distance between the cross-shaped hot melt adhesive strip and the center of the connection point terminal does not exceed 10mm. Heat shrink tubing (3) covers the cross-shaped hot melt adhesive strip and the joint point. The two wire harnesses are inserted into the heat shrink tubing from the two ends of the heat shrink tubing along the axial direction. The heat shrink tubing is a double-walled adhesive heat shrink tubing. The length of the heat shrink tubing at a single joint point is ≥60mm and the wire outlet on one side maintains a coverage length of ≥15mm. The double-walled adhesive heat shrink tubing has a double-walled inner adhesive transparent shrinkage ratio of 4:1 and forms an overflow seal layer at both ends.

2. The waterproof protection device for automotive wiring harness parallel contacts according to claim 1, characterized in that: When the number of outgoing wires is ≥2 and <4, the empty forks of the cross-shaped hot melt adhesive strip are arranged close to the side with the thicker wire diameter.

3. The waterproof protection device for automotive wiring harness parallel contacts according to claim 1, characterized in that: If the wires at both ends of the joint are many-to-many, the crimped point of the heat shrink tubing after heat shrinking is located in the middle of the heat shrink tubing; if the wires at both ends of the joint are one-to-many, the heat shrink tubing is offset 5-10mm towards the single-sided multi-wire end.

4. The waterproof protection device for automotive wiring harness parallel contacts according to claim 1, characterized in that: The two wire harnesses are electrically connected by parallel terminals or ultrasonic welding.

5. The waterproof protection device for automotive wiring harness parallel contacts according to claim 1, characterized in that: The heat shrink tubing specifications are matched to the wire diameter and quantity.

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