Cause analysis of pin back of automobile wiring harness terminal(below)

The wire harness connector is used to connect the connection points of automobile circuits. It is an important part on the car. Its quality directly affects the power or signal transmission effect. The cost ratio of the connector in the car is small, but if there is a quality problem in the use of the car, it often has serious consequences, and the maintenance cost increases significantly. Therefore, the quality of the connector is more and more obtained by car manufacturers and attention of silicone connector seal supplier.

2 . Terminal mating interference

Terminal mating interference refers to the form of failure of the connector when the male and female ends of the connector are mated, because the male terminal is inserted into the female terminal inactive area, causing the connector to lose its functions such as terminal withdrawal. Generally speaking, the reasons for the interference of terminal insertion are: ① structural design problems; ② terminal insertion and extraction force problems.

2.1 Structural design problems The structural design problems of connectors that involve the interference of terminal mating include: the design of the center distance of the connector (including the wrong size or excessive tolerance), the design of the clearance between the terminal and the sheath (including the clearance Too big or too small) and so on.

2.2 Terminal insertion force

Due to the requirements of assembly performance, the insertion and extraction force of the connector terminal seals should be as small as possible, and an excessively small insertion and withdrawal force will increase the contact resistance of the connector and reduce the conductivity. Therefore, a suitable terminal insertion force is to meet the requirements of the connector assembly performance under the premise of ensuring the electrical performance of the connector. In order to improve the terminal's electrical conductivity, the insertion and extraction force of the terminal is often increased in practice. Generally, this will cause assembly difficulties. When the terminal insertion and removal force is greater than the holding force of the terminal in the sheath, it may cause the terminal to withdraw during the mating process of the connector.

3. Product application problems

Product application problems involving the withdrawal of automotive connector seal terminals mainly refer to the problems that may cause the terminals to withdraw during the wire harness production process. Generally includes terminal crimping problems and terminal assembly problems. When the degree of excessive bending is light, the insertion and extraction force of the connector is increased, which affects the assembly performance; when the degree of serious bending is caused, the male terminal cannot be inserted into the effective insertion area of the female terminal during the mating process of the connector, and the terminal is withdrawn .

Automotive Connector Seal

4. In conclusion

There are three reasons for the withdrawal of the connector terminal:

① The retention force of the terminal in the sheath is unqualified—generally caused by design reasons, manufacturing reasons, or reasons for using materials;

② Interfering interference --- generally caused by design or manufacturing reasons;

③ Product application problems-mainly caused by inappropriate use methods in the product use process.

In actual use, if the terminal withdraws, the cause of the problem should be analyzed first, and the problem should be solved in a targeted manner.