Automobile wiring harness refers to the components that are made of copper and formed by bonding the contact terminal (connector) with the wire and cable, then externally moulding and pressing the insulator or the metal shell, etc. to form a connecting circuit by bundling the wire harness. In modern automobiles, there are many wiring harnesses, and the electronic control system is closely related to the wiring harness.
Automobile wiring harness is the main body of the network of automobile circuit. It connects the electrical and electronic components of automobile and makes them function. Without wiring harness, there will be no automobile circuit. At present, whether it is a high-grade luxury car or an economical ordinary car, the form of wire harness is basically the same. It consists of wires, connectors and tape wrapping. It not only ensures the transmission of electrical signals, but also ensures the reliability of the connecting circuit, supplies the prescribed current value to the electronic and electrical components, prevents electromagnetic interference to the surrounding circuit, and eliminates the short circuit of electrical appliances. 。
The automobile harness can be divided into two kinds: the power line carrying the actuator power and the signal line transmitting the input instruction of the sensor. Power lines are thick wires that carry large currents, while signal lines are fine wires that do not carry power. For example, the cross-sectional area of conductors used in signal circuits is 0.3 and 0.5 mm 2. In addition to considering the electrical performance, the selection of electric wires is also restricted by the physical performance of the vehicle, so the selection range is very wide. The double-wall heat shrinkable tube is used for the wiring of various household appliances such as automobiles, airplanes, air conditioners, etc.
The special semi-rigid double-walled tube for wire harness is made by co-extrusion of semi-rigid, flame retardant polyolefin and hot melt adhesive. In addition to the advantages of insulation, anticorrosion and wear resistance of ordinary double-walled tube, the inner layer has the advantages of low melting point, waterproof sealing and mechanical strain cushioning. It is applied to the waterproof sealing and fixing of the branch of automobile wiring harness, the repair of wire and cable, etc.
The special double-walled tubing for oil pipeline is used to protect automobile metal pipeline and fuel pipeline from environmental damage. The specially designed heat-shrinkable tubing can effectively prevent the damage caused by vibration, friction and corrosion, and improve the reliability of the pipeline.