Automotive wire harness contact point protection measures

External protection of automotive wiring harnesses External reinforcement is very important. Reasonable external materials and bandage methods of wire harness can ensure the quality of wire harness, reduce the cost and improve the economic efficiency. It mainly explains the protection methods and materials in automotive wiring harnesses. (1) There are adhesive tape bandage protection, two kinds of adhesive tape, PVC adhesive tape and special cloth-based adhesive tape. The width of the tape is about 40mm, and it varies with the size of the wiring harness contacts in a roll-up manner. PVC tape is generally wound 4 to 7 turns, and wrapped tape is wound 2 to 4 turns. The bandage method is mainly suitable for indoor wiring harnesses such as instrument wiring harnesses, ceiling wiring harnesses, body wiring harnesses, etc., and has less impact on the environment. PVC tape is mainly used in wiring harness pins for controlling switches, signal transmission or low-power circuits. Cloth-based adhesive tape On most circuits used to control electrical appliances, cloth-based adhesive tape has good temperature resistance, generally 150 for a long time and 180 for a short time. (2) Heat shrinkage protection of double-row shrink tubes. According to the size of wiring harness contacts, double-row shrink tubes can choose specifications such as quasi 4, quasi 5, quasi 6, and quasi 9. At the same time, the longer the exposed length of the copper wire, the length of the double-layer heat shrinkable tube will also change, and the general length is between 30 and 50 mm. Double row shrink tubing protection is typically suitable for front chamber wiring harnesses and engine wiring harnesses. This application scenario has a great impact on the environment, such as high temperature of the engine, bad weather, etc. Double-layer heat shrink tubing is completely sealed, which is waterproof, high temperature, abrasion resistant, and naturally costs relatively high. (3) Protection hole terminal The hole-type terminal is generally used for the function of seating iron. Generally, there are seating iron points on the body frame or engine casing. When it is exposed to external air for a long time, especially in bad weather and environment, it is easily affected and oxidized, resulting in increased connection resistance or breakage, it is necessary to protect the terminal pressure wiring core. Commonly single-layer heat shrink tubing or double-layer heat shrink tubing is used. Single-layer heat-shrinkable tubing can be used for indoor wiring harness. Double-layer heat-shrinkable tubing can be used for protection of front cabin wiring harness and engine wiring harness. Double-layer heat-shrinkable tubing is generally used for sealing ground points such as ABS and ECU of automobiles. The conductor of the wire that needs to be exposed will not be oxidized in the future, and the exterior is also protected by heat shrink tubing. For example, the shielding mesh of the shielded wire can be better protected by heat shrinkage.

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