Wiper Motor

What is a Wiper Motor?

Wipers is device used in vehicle to clean windshields from rain, snow & debris and give drivers a clear, unobstructed view of the road.

wiper consists of a metal arm, pivoting at one end and with a long rubber blade attached to the other. The arm is powered by a motor, often an electric motor, although pneumatic power is also used in some vehicles. The blade is swung back and forth over the glass, pushing water or other precipitation from its surface. The speed is normally adjustable, with several continuous speeds and often one or more "intermittent" settings.

a windshield washer system is also used to sprays water or an antifreeze window washer fluid at the windshield using several nozzles. The windshield washer system helps to remove dirt or dust from the windshield when it is used in concert with the wiper blades.

Wipers have small arms or pressure points that distribute pressure from the wiper along the rubber blade. These pressure points keep the rubber blade flexed against the windshield glass to clean the windshield most completely.

How do Electric Wiper Motors Work?

The wipers combine two mechanical technologies to perform their task:

1. A combination electric motor and worm gear reduction provides power to the wipers.

2. A linkage converts the rotational output of the motor into the back-and-forth motion of the wipers.

Motor and Gear Reduction

It takes a lot of force to accelerate the wiper blades back and forth across the windshield so quickly. In order to generate this type of force, a worm gear is used on the output of a small electric motor.

The worm gear reduction can multiply the torque of the motor by about 50 times, while slowing the output speed of the electric motor by 50 times as well. The output of the gear reduction operates a linkage that moves the wipers back and forth.

Inside the motor/gear assembly is an electronic circuit that senses when the wipers are in their down position. The circuit maintains power to the wipers until they are parked at the bottom of the windshield, then cuts the power to the motor. This circuit also parks the wipers between wipes when they are on their intermittent setting.

Linkage System

A rotary link is attached to the output shaft of the gear reduction. This rotary link spins around as the wiper motor turns. The rotary link is connected to a long rod; as the rotary link spins, it moves the rod back and forth. The long rod is connected to a short rod that actuates the wiper blade on the driver's side. Another long rod transmits the force from the driver-side to the passenger-side wiper blade.