Brief introduction of windshield wipers

Windshield wipers are also called wipers, wipers, wipers or windshield wipers. They are used to wipe off raindrops and dust attached to the windshield of a vehicle to improve the visibility of the driver and increase driving safety. Because of legal requirements, almost all cars have windshield wipers. Wipers are also installed on the rear windows of vehicles such as hatchbacks and SUVs. In addition to cars, wipers are also installed on other transportation vehicles, such as trains and trams. Certain engineering machinery and tools, such as cranes, are also equipped with windshield wipers.
Basic introduction
The wiper blade refers to a sheet structure installed in front of the windshield, which is composed of a motor, a reducer, a four-bar linkage mechanism, a wiper arm spindle, a wiper blade assembly, etc. The main function is to sweep the windshield from obstructing the line of sight Rain, snow and dust.
The intermittent flexible wiper is adjusted by the driver according to the rain and sight conditions. The difference from the wiper on other ordinary cars is that it can automatically raise and lower the wiper speed according to the change of the vehicle speed. Because in the same amount of rainfall, the faster the vehicle speed, the more oncoming rainwater, and if the vehicle stops, the slower operation of the wiper reduces the noise.
Principle of operation
The power source of the wiper comes from the electric motor, which is the core of the entire wiper system. The quality requirements of wiper motors are quite high. It uses a 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 decelerate and increase the torque, and its output shaft drives the four-bar linkage mechanism, through which the continuous rotary motion is changed into a left-right swing motion.
The wiper motor adopts a 3-brush structure to facilitate speed change. The intermittent time is controlled by an intermittent relay, and the charge and discharge functions of the return switch contact of the motor and the resistance and capacitance of the relay are used to make the wiper wipe according to a certain period. The wiper blade rubber strip is a tool to directly remove rain and dirt on the glass. The wiper strip is pressed against the glass surface by the spring strip, and its lip must match the angle of the glass in order to achieve the required performance.
Under normal circumstances, there is a wiper control knob on the handle of the automobile combination switch, with 3 gears of low speed, high speed and intermittent. At the top of the handle is a washer button switch. When the switch is pressed, washing water is sprayed, and the windshield is washed with the wiper. The scrubber system is a very common device on the car. It consists of a water storage tank, a water pump, a water delivery pipe, and a water spray nozzle. The water storage tank is generally a plastic tank of 1.5 liters to 2 liters. The water pump is a miniature electric centrifugal pump. The washing water is divided into small jets and sprayed to the windshield, which cooperates with the wiper to clean the windshield.

Post time: Aug-24-2021