Wiper Drive Composition

1. Composition and working principle: Electric wipers are mainly composed of DC motors, worm gear boxes, cranks, connecting rods, swing rods and wiper blades. The normal motor and worm gear box are combined into one to form the Wiper Motor Assembly. The crank, connecting rod, swing rod and other rods convert the rotation of the worm gear into the reciprocating swing of the swing arm, so that the wiper blade on the swing arm realizes the wiper action. The power source of the wiper comes from the electric motor, which is the core of the entire wiper system. It generally uses a DC permanent magnet motor. The wiper motor adopts a 3-brush structure to facilitate speed changes. The intermittent time is controlled by the intermittent relay, which uses the return switch contact of the motor and the charge and discharge function of the relay's resistance and capacitance to make the wiper sweep according to a certain period. The wiper blade strip is a tool that directly removes rainwater and dirt from the glass. The wiper blade strip is pressed to the glass surface through the spring strip, and its lip must match the angle of the glass to achieve the required performance. The wiper blade is divided into two structures: bone wiper and boneless wiper. Bone wipers are traditional wipers with a metal bracket; boneless wipers have no metal bracket.

From a design principle, the more fulcrums the wiper has, the more uniform the force on the wiper blade will be, and the more docile the wiper blade will be in contact with the glass, thus achieving a better water removal effect. The boneless wiper does not have a bracket and uses the entire wiper blade itself to pressurize it. This is equivalent to the entire wiper blade being a stress point, so the boneless wiper is more effective than the bone wiper. The washer system is a very common device on cars. It consists of a water storage tank, a water pump, a water pipe, and a water spray nozzle. The water storage tank is generally a 1.5-2 liter plastic tank, and the water pump is a miniature electric centrifugal pump, which transports the washing water from the water storage tank to the water spray nozzle, and the washing water is divided into small particles through the squeeze of the water spray nozzle. The jet sprays towards the windshield and cooperates with the wiper to clean the windshield. The wipers of some high-end vehicles are also equipped with electronic speed regulators. This speed regulator has a sensing function and can automatically adjust the swing speed of the rain arm according to the amount of rain. , the Wiper Arm rotates faster when the rain is heavy, when the rain is light, the wiper arm rotates slowly, and when the rain stops, the wiper arm also stops.