The main function of the automobile connector is to connect the blocked or isolated circuits in the circuit, so that the current can flow and the circuit can achieve the predetermined function. The automobile connector is composed of four main parts: shell, contact, accessory and insulator. The specific functions of the four main parts of the automobile connector are introduced as follows:

A. The shell is the outer cover of the automobile connector, which provides mechanical protection for the built-in insulating mounting plate and pin, and provides the alignment when the plug and socket are inserted, so as to fix the connector to the equipment;

B. The contact is the core part of the automobile connector to complete the electrical connection function. Generally, the contact pair is composed of male contact and female contact, and the electrical connection is completed through the insertion of female and male contact. The male contact is a rigid part, and its shape is cylindrical (round pin), square cylinder (square pin) or flat (insert). Male contacts are generally made of brass and phosphor bronze. The female contact, namely the socket, is the key part of the contact pair. It relies on the elastic structure to produce elastic force when it is inserted with the pin to form close contact with the male contact and complete the connection. There are many types of jacks, including cylindrical (slotted, necked), tuning fork, cantilever (longitudinally slotted), folded (longitudinally slotted, 9-shaped), box (square) and hyperboloid spring jacks;

C. Accessories are divided into structural accessories and installation accessories. Structural accessories such as snap ring, locating key, locating pin, guide pin, connecting ring, cable clamp, sealing ring, sealing gasket, etc. Install accessories such as screws, nuts, screws, spring rings, etc. Most accessories include standard parts and general parts;

D. Insulator is also often called automobile connector base or insert. Its function is to arrange the contacts according to the required position and spacing, and ensure the insulation performance between the contacts and between the contacts and the shell. With good insulation, the two ends adopt combined screws.