Automotive wiring harness design specification 1

Connector selection principles:

① The selection of connectors should ensure good contact with electrical components, minimize contact resistance, and improve reliability. Double spring clamping structure connectors should be preferred.

② Reasonably select the size of the connector according to the cross-sectional area of ​​the wire and the current passing through.

③ For the sheaths docked in harsh environments such as the engine compartment and chassis, due to the high temperature and humidity and the presence of many corrosive gases and liquids, waterproof sheaths must be selected, and the empty space needs to be sealed with waterproof plugs. At the same time, attention should also be paid to the selection of sheath materials, such as flame retardant properties.

④ Try to avoid using the same sheath in the same docking area. If it cannot be avoided, it needs to be distinguished by different colors.

⑤ Based on the overall coordination of the car's appearance, black or dark sheaths should be preferred in the engine compartment.

⑥ In order to reduce the types and number of sheaths for wiring harness docking, mixed parts should be preferred to make assembly and fixation convenient.

⑦ When the door harness is connected to the body harness, it is best to use a connector with a locking mechanism to ensure that the connection is not loosened during frequent opening and closing of the door.

⑧ In order to save costs, electrical equipment with a lower safety level should try to choose domestic parts that meet their performance requirements; non-waterproof sheaths can be selected in the cab except for the floor.

⑨ Connectors away from the high-temperature parts of the engine compartment should use high-temperature resistant nylon sheaths

Terminal selection principles

The terminals used for connectors are mainly composed of brass and bronze (the hardness of brass is slightly lower than that of bronze), of which brass accounts for a larger proportion. In addition, different plating layers can be selected according to different needs. For terminal connectors used for airbags,

ABS, ECU, etc. with higher performance requirements, gold-plated parts should be used first to ensure safety and reliability, but for cost considerations, partial gold plating can be selected on the premise of meeting performance requirements.

①. Ensure the reasonable match between the terminal and the selected connector;

②. Select the appropriate terminal according to the wire diameter of the crimped wire;

③. For single-hole waterproof connectors, choose a terminal whose tail can be crimped with a waterproof plug;

④. The terminal should preferably be a double-spring structure with very small contact resistance;