How do I choose protective materials for automotive wiring harness contacts? How do you choose protective materials based on the difference in the position of the harness in the car? What protective materials are more appropriate and economical to choose?

Automobile wiring harness consists of connectors, conductors, insulating bandaging materials and so on. With the development of the Times and the continuous improvement of people's requirements, more and more automobile additional functions, automotive wire harness wire root number also increased. Automobile wiring harness in the traditional product design more use of connector connection, in recent years the car is constantly cutting prices, automotive wire harness multi-line connection design by the connector connection changed to U-card connection or high-frequency welding connection mainly connection mode. The number of wire harness wire contacts (the conductor connection points of the contact guide line and the wire) increases day by day, and the protection of the contacts is particularly important, which will directly affect the reliability and safety of the automobile wiring harness.

Automobile wiring Harness mainly has the dashboard wiring harness assembly, the engine wiring harness assembly, the engine compartment (front cabin) wiring harness assembly, the body wiring harness assembly, the four-door wiring harness assembly, the top cover wire harness, the bumper wire harness. The wire harness contact protection material is different depending on the position of the wiring harness loading on the car. This paper mainly describes the U-type card connection contact protection materials. The so-called U-card connection refers to two or more than two wires with the help of U-terminal, crimping equipment cold stamping together process. At present, the commonly used wire harness contact protection materials have two categories, 5 kinds of specifications. The protective materials and properties of the U-card connection contacts are described below.

Double Wall Heat shrinkable tube

Transparent double-walled heat shrinkable tube

Transparent double-walled heat shrinkable tube outer layer to transparent, semi-hard polyolefin as a material, by radiation crosslinking and special process Seiko made, the inner layer to high viscosity waterproof transparent hot melt adhesive composition. Thermal shrinkage tools often use hot air gun heating shrinkage, heat shrinkable tube Specification Size selection According to the size of the line diameter to choose. For example: ≤2.0 MM2 line diameter using Φ4 specification model, 2.5≤φ<3.0mm2 line diameter using Φ5 specification model.

1) Advantages have waterproof performance, good insulation effect, you can see the connection effect of the contact, to see if the Crimping method meets the requirements.

2) The range of use is commonly used in the fully waterproof automotive wiring harness contacts, as well as the engine wiring harness and the node protection to start the cabin harness.

Black double wall Heat shrinkable tube

Black double-walled heat shrinkable tube outer layer using high-quality polyolefin materials, the inner layer of hot melt glue composite processing. The heat shrinkage tool can shrink by heating with a hot air gun or a baking heat shrinkable tube machine, and the selection of the size of the heat shrinkable tube is selected according to the size of the line diameter. For example: ≤2.0 mm2 line diameter using Φ4 specification model, 2.5≤φ<3.0mm "line diameter using Φ5 specification model.

1) Advantages insulation, anti-corrosion, waterproof performance is the highest, heat shrinkage can be clearly seen at both ends of the heat shrinkable tube with white glue overflow.

2) The range of use is commonly used in the fully waterproof automotive wiring harness contacts, as well as the engine wiring harness and the node protection to start the cabin harness. ”

汽车线束中接点防护材料

汽车线束接点如何选用防护材料？根据线束在汽车位置上的不同来如何来选择防护材料?选择什么样的防护材料更合适、更具有经济性?

   汽车线束由插接器、导线、绝缘包扎材料等组成。随着时代的发展和人们要求的不断提高，汽车附加功能越来越多，汽车线束导线根数也随着增加。汽车线束在传统的产品设计中多使用连接器连接，近年来汽车在不断降价，汽车线束多线连接设计由连接器连接改成了以U型卡连接或者高频焊连接为主的连接方式。线束导线接点（接点指导线与导线的导体连接点）数量逐日增加，对接点的保护尤为重要，这将直接影响汽车线束的可靠性和安全性。

汽车线束主要有仪表板线束总成、发动机线束总成、发动机舱（前舱）线束总成、车身线束总成、四门线束总成、顶盖线束、保险杆线束。根据线束在汽车上装车位置的不同，线束接点防护材料也不同。本文主要讲述U型卡连接接点防护材料。所谓U型卡连接指将两根或两根以上的导线借助U型端子、压接设备冷冲压在一起的过程。目前常用线束接点防护材料有两大类、5种规格。下面介绍采用U型卡连接接点的防护材料和特性。

   双壁热缩管

  透明双壁热缩管

   透明双壁热缩管外层以透明、半硬聚烯烃为材质，经辐射交联及特殊工艺精工制作而成，内层以高粘性防水透明热熔胶构成。热缩工具常使用热风枪加热收缩，热缩管规格大小的选择根据线径的大小来选择。例如：≤2.0 MM2的线径使用φ4规格型号，2.5≤φ<3.0mm2的线径使用φ5规格型号。

   1)优点具有防水性能，绝缘效果好，可以看到接点的连接效果，查看压接方式是否符合要求。

   2)使用范围常用于防水要求较高的汽车全套线束接点中，以及发动机线束和发动机舱线束的节点保护。

   黑色双壁热缩管

   黑色双壁热缩管外层采用优质的聚烯烃材料，内层热熔胶复合加工而成。热缩工具使用热风枪或者烤热缩管机加热即可收缩，热缩管规格大小的选择根据线径的大小来选择。例如：≤2.0 mm2的线径使用φ4规格型号，2.5≤φ<3.0mm“的线径使用φ5规格型号。

   1)优点绝缘、防腐、防水性能最高，热缩后能够明显看到热缩管两头有白色包胶溢出。

   2)使用范围常用于防水要求较高的汽车全套线束接点中，以及发动机线束和发动机舱线束的节点保护。”