What are the applications of micro switches in cars?

Automotive switches generally have core components called microswitches, which have good integration, easy installation, miniaturization, and can be widely used in automotive switches.

A micro switch is a type of switch that has a small contact spacing and a quick action mechanism, which operates with a specified stroke and force. It is covered by a casing and has a driving rod on the outside. Because the contact spacing between the switches is relatively small, it is called a micro switch, also known as a sensitive switch.

The main characteristics of microswitches are: small contact spacing, quick action, and shell wrapping. In addition, micro switches also have a long lifespan and high reliability.

Car seat micro switch

Micro switches are also widely used in car seat switches and window lift switches

The seat switch can be seen to have a relatively simple circuit, which should be directly connected to the seat motor. This switch uses three micro switches, which directly conduct or cut off power through the micro switches.

Automotive door lock micro switch

The micro switch in the car door lock is used to detect whether the car door is closed, whether the child lock is locked, whether the central control is locked, and other lock functions have a warning and reminder function. If it is not in place and the micro switch does not close, it will be displayed on the car's instrument panel to remind the driver. The micro switch does not participate in the lock function, but only detects whether the lock function is locked in place, Micro switches are actually detection systems

Automotive transmission micro switch

The car gearbox also uses micro switches, which can change the transmission ratio, expand the range of torque and speed changes of the driving wheels, to adapt to frequently changing driving conditions, and enable the engine to work in favorable conditions (higher speed and lower fuel consumption); In addition, allowing the car to travel in reverse while keeping the direction of engine rotation unchanged; The gearbox can also use neutral gear to interrupt power transmission, allowing the engine to start, idle, and facilitate gear shifting or power output.

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Characteristics and structure of micro switches

Micro switches mainly include driving rods, movable pieces, and static contacts.

Drive lever: - is a part of the switch that transmits external forces to the internal spring structure, pushing the moving contacts to perform switch actions.

Movable piece: Refers to the mechanism part of the switching switch contact, sometimes also known as a movable spring. The movable piece contains movable contacts, and the high current switch contacts are generally made of silver alloy, commonly used silver tin oxide contacts, which have good resistance to electrical wear, welding resistance, and conductivity. The contact resistance is small and stable.

Contact spacing: refers to the distance between static and dynamic contacts, and the effective distance of the switch.

Similarly, in general, each function of a glass lifting switch corresponds to a micro switch, and its principle is the same, including movable pieces, contact spacing, etc

In summary, the micro switch applies external force to the movable piece through the driving components (such as the pin and driving rod). When the movable piece moves to the critical point, it generates instantaneous action, causing the moving contact at the end of the movable piece to quickly connect or disconnect from the static contact. When the force on the driving component is removed, the movable piece generates a reverse action force. When the reverse stroke of the driving component reaches the critical point of the movable piece's action, the reverse action is instantly completed.