Introduction to various switches of automobile

　　1. Push-pull type: created in the 1940s and developed in the 1950s, it is widely used in cars and trucks. Mainly rely on the role of push and pull to complete the on and off circuit, some varieties also have bimetallic safety device and light regulation resistance (see figure 1). At present only in the domestic bus, truck use. Its characteristic is the structure is simple, the price is cheap, the inadequacy is the volume is big, the operation force is big, when the vehicle runs, adjust gear position is inconvenient.
　　2. Rotary: mainly rely on spindle rotation to change gear, in order to achieve the purpose of circuit on and off. There are many varieties of this kind of switch. One is a keyoperated ignition switch, which is composed of a lock mechanism and a switch. The switch is fixed by the mounting nut. The other is a switch with knobs of different shapes. If use circular knob to control the switch of rearview mirror Angle, already match at present go up in all sorts of design of santana 2000 car.
　　3. Jacking type: this kind of switch action principle is relatively simple, mainly in the specified external force action, jacking rod in a certain range of linear motion, to push the contact closed (or open), once the external force disappeared, rely on its own reaction spring automatic reset, so that the contact remains in the original state. This is a signal switch used for doors and brake lights. At present, there are two types of coordination of brake light switch in brake system. One is the combination of brake light switch and brake system oil (steam) road, which basically belongs to this type on the truck at present. The other is the separation of brake light switch and brake system. This structure is mainly used in cars. The brake light switch is connected to the brake pedal by mechanical structure.
　　This variety has the following characteristics: (1) the jacking rod extension distance can be adjusted in a certain range of dimensions to meet the needs of the working stroke when braking. (2) two pairs of parallel contacts are adopted to ensure the reliability when the signal lamp is switched on. (3) special measures have been taken on the structure and materials to ensure the reliability and durability of the products, and the service life can reach more than 250,000 times.
　　4. Flexible plate type: the main feature is that the working fulcrum is in the center and the working point is on both sides of the fulcrum, when pressing a working face, the other working face is up, like a seesaw. Since the 1980s, the switch gradually emerged, and widely used in buses, cars, according to the different USES of its internal structure is also different.