The automotive wiring harness is functionally divided into a power line carrying electric power for driving an actuator (actuator) and a signal line for transmitting a sensor input command. A power line is a thick wire that carries a large current, and a signal wire is a thin wire (optical fiber communication) that does not carry power.
The cross-sectional area of the wire for the motor and the actuator is 0.85 and 1.25 mm2, and the cross-sectional area of the power supply circuit is 2, 3, and 5 mm2; and the special circuit (starter, alternator, engine grounding wire, etc.) has 8. 10, 15, 20mm2 different specifications. The choice of wires, in addition to considering electrical performance, is also subject to physical performance constraints. For example, frequent on/off doors on a taxi and wires that span the body should be made up of wires with good flexing properties. In recent years, electromagnetic shielding lines used in weak signal circuits have also increased.
With the increase of the functions of automobiles, the universal application of electronic control technology, the number of circuits and the amount of electricity used in automobiles have increased significantly, the wiring harness has become thicker and heavier, how to make a large number of wire harnesses more effective in a limited car space. Reasonable layout, so that the car harness to play a greater role, has become a problem facing the automotive industry.
Material selection:
The quality of the wire harness material directly affects the quality of the wire harness, and the choice of the wire harness material is related to the quality and service life of the wire harness. Remind everyone, the choice of online bundle products, must not be cheap, cheap wire harness products may be inferior wire harness materials. How to tell the quality of the wire harness? I understand the material of the wire harness. The following is the information on the selection of wire harnesses.
The wire harness is generally composed of a wire, an insulating sheath, a terminal block, and a wrapping material. As long as you understand these materials, you can easily distinguish the quality of the wiring harness.
First, the material selection of the terminal block
The copper used for the terminal material (copper) is mainly brass and bronze (the hardness of brass is slightly lower than that of bronze), and brass accounts for a large proportion. In addition, different coatings can be selected according to different needs.
Second, the choice of insulation jacket
The commonly used materials for the sheath material (plastic parts) are PA6, PA66, ABS, PBT, pp, etc. Flame retardant or reinforcing materials can be added to the plastic according to the actual situation to achieve the purpose of strengthening or flame retardant, such as adding glass fiber reinforcement.
Third, the choice of wire harness
Select the appropriate wire material depending on the environment in which it is used.