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Wiper Motor, the power source of the wiper blade, is the core of the whole wiper system. Therefore, the quality of the wiper motor must be guaranteed to ensure its performance. The wiper motor is a permanent-magnet direct current (DC) one. It is equipped on the front windscreen glass with the mechanical parts of the worm gear. The worm gear functions to slow down and increase torque. Its output shafts spur four-bar linkage, by which the movement is changed from rotary to swinging.
Three-brush structure is adopted to make speed change more convenient. The intermittent relay, by which the interval is controlled, utilizing the return of switch contacts and the charge-discharge function of the resistor-capacitor in the relay, drives the wiper to wipe in a certain cycle. The wiper blade tape, the tool to clean the rainwater and the filth on the glass, presses the surface of the glass with springs. Only when the tip of the blade is in a certain angle with the glass, can the required function be realized.
Generally speaking, there is a wiper control knob, with stalls of low peed, high speed and intermission, on the handle of auto combination switch. The top of the handle is the key switch, after pressing which water will erupt to wiper blade, of the scrubber. The scrubber system, consisting of plastic water tank (1.5—2 liters), micro-electric centrifugal water pump, pipes, spray nozzles, is very ordinary equipment in automobiles. Water in the tank is supplied through the pump to 2—4 spray nozzles, by which it is extruded into trickles. Then the trickles are sprayed onto the windshield glass, to clean the glass with the wiper blade.
