The power source of the wiper comes from the motor, which is the core of the whole wiper system. The quality requirements of wiper motor are quite high. It adopts DC permanent magnet motor, and the wiper motor installed on the front windshield is generally integrated with the worm gear mechanical part. The function of the worm gear mechanism is to reduce speed and increase torque. Its output shaft drives the four-bar linkage, which changes the continuous rotating movement into the left and right swinging movement. The wiper motor adopts a 3-brush structure to facilitate speed change. The intermittent time is controlled by the intermittent relay, and the wiper can be wiped according to a certain period by using the charging and discharging function of the return switch contact of the motor and the relay resistance capacitor. The wiper blade rubber strip is a tool for directly removing rain and dirt on the glass. The blade rubber strip is pressed to the glass surface through the spring strip, and its lip must match the glass angle to achieve the required performance. Generally, there is a wiper control knob on the car combination switch handle, with three gears: low speed, high speed and intermittent. At the top of the handle is the washer key switch. When the switch is pressed, washing water will be sprayed out to wash the windshield with the wiper. The washer system is a very common device on a car, which consists of a water storage tank, a water pump, a water delivery pipe, and a spray nozzle. The water storage tank is usually a 1.5L~2L plastic tank, and the water pump is a micro electric centrifugal pump, through which the washing water in the water storage tank is delivered to the spray nozzle, and the washing water is sprayed into a small jet to the windshield through the extrusion of 2-4 spray nozzles, which plays the role of cleaning the windshield with the wiper.
On rainy days, when raindrops fall on the window glass, the vision in front of the car is quickly blocked, and the vehicles, pedestrians and scenery become blurred. At this time, turn on the wiper, and the front of the car will be clear. If the vehicle is driven in rainy days and the wipers are not used or fail to work normally, it will be very harmful to driving safety. (1) Before heavy rain, check whether the car wiper can work normally. (2) In a rainstorm, rapid and large raindrops hit the windshield. Even if the wiper moves fast, it is difficult to wipe the raindrops, which will affect the driver's vision. In order to ensure driving safety, stop driving immediately. For example, the reason why the wiper cannot wipe clean: the main reason why the wiper cannot wipe clean is that there is invisible dirt on the glass. First, the car stopped at the downwind of the cooling tower of the central air conditioner. The cooling tower sprinkled the particles torn by water on the glass to form small white spots. After drying, it was difficult to completely remove them; Second, when the car stops under a tree, the mucus secreted by insects sticks to the car glass; The third is the mucus from insect bodies smashed by long-distance high-speed running. As these things are stuck on the glass, it is difficult to completely remove them with water and a cleaning cloth (only invisible), forming uneven surfaces on the glass. In this way, when the wiper is used, the glass cannot be cleaned. Wet the glass with water and touch it back and forth with your hand. If the glass surface is not smooth, it indicates that there is foreign matter. You can try to wipe it with warm water for several times, and then gently rub it with your hand, or you can use newspaper to remove these hard to remove dirt bit by bit. The effect is good. After washing with water, you can touch the glass with your hand, which is very smooth. So far, open the wiper and try it. It wipes very clean. Owners with such sunny conditions can try.