A windshield wiper is one of the most familiar of automotive accessories. Wipers are used to clean vehicle windshields to give drivers a clear, unobstructed view of the road ahead no matter what the weather. The electric wiper moves back and forth across the windshield's glass to sweep debris, water, and snow out of the way. Most of us couldn't imagine our cars without wipers.
The mechanism behind wipers is the windshield wiper motor, which provides the power the wipers need. A linkage converts the rotational output of the windshield wiper motor into the back-and-forth motion of the wipers. A worm gear controls the force that the windshield wiper motor delivers to the drive arm by slowing down the speed of the electric motor by 50 times while multiplying the torque by 50 times.
The parts of the wipers that are visible from the outside include a rubber blade, arms to hold the rubber blades, and a spring linkage. There are usually two standard wipers, one in front of the driver, and one towards the middle which cleans the glass in front of the passenger. Some vehicles have just one large wiper or a different arrangement of wipers. In the most usual arrangement, the two wipers move in tandem to clean the glass. The wipers, secured by pivots, are mounted on brackets at both ends of a connecting link, which is basically a long rod.
The pressure from the motor on the driver's side of the connecting link moves the other windshield wiper. The connecting link is attached to the drive link near the windshield wiper motor. An electronic circuit settles the wiper if it's an intermittent setting and also provides consistent power to the wiper; a spring linkage ties the pivot to the drive link to return the wiper to its resting position and keeps the wipers close to the windshield. Inside the windshield motor assembly, the electronic circuit maintains power until the windshield wiper is in the down position, and then cuts the power to the wiper motor. The circuit also places the wiper in the down the position between wipes. However, moisture can promote rust and can affect the stator mechanism in the motor. When rust sets in, the wiper motor may not work effectively and can cause the wiper to stop intermittently across the windshield.
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. The greater the number of pressure points on the wiper, the better the pressure against the windshield. The rubber blade also includes a blade frame with intermittent slots and replacement holes in the frame which make it easy to replace the rubber in the blade. The rubber should be replaced periodically, as it will wear out more quickly than any other part of the wipers.
NMB has been manufacturing components for automotive applications, such as a windshield wiper motor, for a long time. All products from NMB, including brush and brushless DC motors, stepper motors, miniature ball bearings, and bearing assemblies, are not only reliable but also offer smooth operation and longevity. Our bearings and motors are frequently used in windshield wiper motors and other automotive components. With NMB components, you can be sure our manufacturing expertise will deliver you a high quality wiper motor. To learn more about using NMB components explore our selection of motors and bearings online or contact us today.