Introduction to common materials used in automotive wiring harnesses

Automotive wiring harness commonly used materials Introduction I. Wire (low-voltage wire, 60-600V) Types of wire: national standard wire: QVR, QFR, QVVR, QBV, QBVV, etc. Japanese standard wire: AV, AVS, AVSS automotive wiring harnesses, AEX, AVX, CAVUS, EB, TW, SHE-G, etc. German standard wire: FLRY-A, FLRY-B, etc. U.S. standard wires: SXL and other commonly used specifications have a nominal cross-sectional area of 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 4.0, 6.0 and other square millimeters of wire II, sheath sheath (plastic shell), usually made of plastic, the wire has been pressed into the terminal to ensure that the reliability of the connection, the material is mainly PA6, PA66, ABS, PBT, PP, etc. III, terminals, a molded hardware components, crimped to the wire. Terminals are a kind of molded hardware parts, crimped on the wire to connect different wires to transmit signals, divided into male terminals, female terminals, ring terminals and round terminals, etc. The material is mainly brass and bronze. The material is mainly brass and bronze (the hardness of brass is slightly lower than the hardness of bronze), of which brass accounts for a larger proportion. Fourth, sheath accessories: waterproof plugs, blind plugs, seals, locks, clasps, etc. are generally used and sheath terminals to form connectors

Fifth, the wiring harness over the hole rubber parts play a wear-resistant, waterproof, sealing and other roles. Mainly distributed in the engine and cab interface, the front cabin and cab interface (left and right a total of 2 places), four doors (or back door) and the compartment interface, fuel tank inlet. Six, tie (nail) an original usually made of plastic, used to fix the wiring harness in the car. There are ties, bellows lock ties. Seven, the pipe is divided into bellows, PVC heat-shrinkable tube, glass fiber tube. Braided tube, winding tube and so on. Used to protect the wire harness. (Classified by different diameters) 1, bellows Bellows in the harness wrapping generally accounted for about 60%, or even more. The main feature is better abrasion resistance, high temperature resistance in the high temperature zone, flame retardant, heat resistance are very good. The temperature resistance of bellows is between -40-150℃. Its material is generally divided into 2 kinds of PP and PA. PA material is better than PP material in flame retardant and abrasion resistance; but PP material is stronger than PA material in bending fatigue resistance. 2, PVC heat-shrinkable tube PVC tube function and corrugated tube is almost the same. PVC tube softness and resistance to bending deformation is better, and PVC tube is generally closed, so the PVC tube is mainly used for wire harness corner branch, in order to make the conductor smooth transition. pvc tube heat-resistant temperature is not high, generally in the 80 ℃ or less. Eight, tape production tape: wrapped around the surface of the wire harness. (Divided into PVC, sponge tape, cloth tape, paper tape, etc.). Quality marking tape: used to mark the defects of the production products. Tape in the harness to play a bundling, wear-resistant, insulation, flame retardant, noise reduction, marking and other roles in the wrapping materials generally accounted for about 30%. Wiring harness with tape is generally divided into PVC tape, gas flannel tape and cloth-based tape 3 kinds of PVC tape wear resistance, flame retardant better; temperature in 80 ℃ or so, noise reduction is not good, the price is cheaper. The material of flannel tape and cloth tape is PET, the wrapping and noise reduction of flannel tape is better, the temperature resistance is about 105℃; the abrasion resistance of cloth tape is better, the temperature resistance is higher about 150℃. The common disadvantage of flannel tape and cloth tape is that they are not good at flame retardant and expensive.

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