Thursday, September 4, 2014

How Wind Shield Wiper Mechanism Works in Your Car

The wind shield wipers of your car clean the windshield in the front. The wipers work by an electric circuit. The wind shield wipers are equipped with a special mechanism to moving back and forth across the windshield countless times and thus clear the water from the windshield. On their highest speed, they moves very fast shaking the car from side to side. Let us discuss in this article the working mechanism of wind shield wipers

Working of Wind shield Wipers mechanism in Your Car

The wind shield wipers runs on two mechanisms to perform required task:
They are as follows
  1. A combination electric motor and worm gear reduction to reduce required power to the wipers.
  2. A connecting link that converts the rotational output of the motor into the back-and-forth motion of the wipers.
  • Electric Motor and worm Gear Reduction
    • This mechanism is used to accelerate the wiper blades.
    • It takes lot of force to accelerate the wiper blades back and forth across the windshield quickly.
    • To generate this force a worm gear is used on the output side of electric motor.
    • The worm gear can increase the torque of the motor by 30 times. The output of the gear reduction operates a connecting link hat moves the wipers back and forth.
    • Inside the motor-gear assembly there is an electronic circuit that is used to sense when the wipers are in rest position.
    • The circuit provides the power to the wipers until they are parked at the rest position of the windshield
    •  then cuts the power to the motor.
    • This is how the electric motor and worm gear mechanism of wind shield wipers works.
  • The connecting linkage to convert the rotational output of motor into back-and forth motion
    • A cam is fixed to the output shaft of the worm gear reduction.
    • This cam rotates around the wiper motor.
    • The cam is connected to a rod as the cam rotates the link moves the rod back and forth.
    • This rod is attached 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.
    • Due to this mechanism both the passenger wipers and the driver' side wipers moves in back and forth direction.
    • Windshield wiper systems are designed to wipe the wind shield/window for about 1.5 million times in their lifetime.
    • These are the two mechanism that are equipped inside the car wind shield system to move the wipers back and forth.

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