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Source of information: Date of this site: 2016-03-01

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What is a car harness?

Automobile wiring harness is the main body of the network of automobile circuit. Without wiring harness, there is no automobile circuit. At present, whether it is a high-end luxury car or an economical ordinary car, the form of the wire harness is basically the same, and is composed of wires, connectors, protective sleeves and positioning parts.

Automobile wires are also called low-voltage wires, which are different from ordinary household wires. The ordinary household wire is a copper single core wire, which has a certain hardness. The automobile wires are copper multi-core flexible wires, some of which are as thin as hair, and several or even dozens of flexible copper wires are wrapped in a plastic insulation tube (polyvinyl chloride), which is soft and not easy to break.

2. What are the common specifications of automotive wiring harnesses?

The common specifications of the wires in the automobile wiring harness are nominal cross-sections of 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 4.0, 6.0 and other square millimeter wires. Each of them has a permissible load current value and is suitable for different power electrical equipment. Of wires.

What are the materials of automotive wiring harnesses?

Automotive wiring harness also has very strict material requirements. Including its electrical properties, material emission, temperature resistance, etc., are higher than general wiring harness requirements, especially when it comes to safety: wiring harnesses for important components such as directional control systems and brakes have stricter requirements.

What is the function of the automotive wiring harness?


There are two types of automotive wiring harnesses: power lines that carry the power of driving actuators (actuators) and signal lines that transmit sensor input commands.

Power lines are thick wires that carry large currents, while signal lines are thin wires (optical fiber communications) that do not carry electricity; for example, the cross-sectional area of the wires for signal circuits is 0.3, 0.5 mm2.

The cross-sectional area of wires for motors and actuators is 0.85, 1.25mm2, while the cross-sectional area of wires for power circuits is 2, 3, and 5mm2; and for special circuits (starter, alternator, engine ground wire, etc.), 8, 10, 15, 20mm2 different specifications.

The larger the cross-sectional area of the wire, the larger the current capacity. In addition to considering the electrical performance, the choice of electrical wires is also restricted by the physical performance of the vehicle. Therefore, its selection range is very wide. For example, the frequently opened / closed doors on taxis and the wires that cross the body should be composed of wires with good flexibility. Generally, the wires used in high temperature parts are vinyl chloride or polyethylene coated wires with good insulation and heat resistance. In recent years, electromagnetic shielding wires used by weak signal circuits have also been increasing.

With the increase of automotive functions, the widespread application of electronic control technology, more and more electrical parts, and more and more wires, the number of circuits and power consumption on the car has increased significantly, and the wiring harness has become thicker and heavier . This is a big problem that needs to be solved. How to make a large number of wiring harnesses more efficiently and reasonably arranged in a limited automotive space, so that automotive wiring harnesses can play a greater role. This will become a new technology for automotive wiring harness manufacturers to conduct technical research and innovation in the future. trend.


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