What is the principle of power windows?
2 Answers
Power windows generate power through an electric motor, which drives various mechanical devices to achieve automatic window movement. Below is an introduction to the principle of power windows: 1. Most car window regulators use this flexible linkage structure, which not only enables the window to move up and down but also keeps it in a horizontal position. The motor connects to a worm gear through a spur gear to achieve a reduction ratio, thereby providing the torque needed to raise the window. The worm gear mechanism has a self-locking feature—the worm can drive the gear, but the gear cannot drive the worm. Therefore, besides reducing speed, the worm gear also ensures that the window cannot be forcibly opened, enhancing safety. 2. Connected to the spur gear is a large disk with gear teeth. The motor's power is transmitted to this disk, causing the linkage to swing. The linkage has a long arm connected to the bottom of the window. The end of this arm slides within a groove during window movement.
The principle of power windows is quite interesting. When we press the button inside the car, the signal is transmitted to a small electric motor, which then transfers power to the lifting mechanism through reduction gears. Common mechanisms include the rail type or cable type—the motor's rotation drives the arm or cable to move the glass up and down. The glass, embedded in sliding channels, moves smoothly thanks to the design of balanced forces that prevent tilting. Key components include the switch, relay for current control, and pinch sensors on automatic windows to prevent injuries. If the glass gets stuck, it might be due to worn gears or dust clogging the sliding channels—regular cleaning of door and window seams with some lubricant spray is recommended. Routine maintenance should not be overlooked, as it can extend the window's lifespan and reduce the risk of malfunctions.
