How Does An Electric Fan Oscillate Back And Forth?

Everyone usually knows that there is a small button on the back of the fan head when using an electric fan. If you press the button, the fan will swing back and forth, and if you pull the button up, the fan will be fixed in the position where the button is pulled up.

Yesterday, my Xiaomei stared at the fan in a daze and asked me this question, how does the electric fan swing back and forth? Collect some information to share with everyone during the explanation.

NO1. Fan shaking head principle

Let's take a look at the internal structure of the electric fan:

The reciprocating oscillation of the electric fan is the result of the combined action of the worm gear drive, the gear meshing drive and the crank rocker mechanism. Let's take a look at each of these three institutions.

Worm gear structure: It is commonly used to transmit motion and power between two staggered shafts. Worm gears and worms are equivalent to gears and racks in their intermediate planes, and worms are similar in shape to screws.

Gear meshing transmission: Gear transmission is a mechanical transmission that uses the teeth of two gears to mesh with each other to transmit power and motion. It has the characteristics of compact structure, high efficiency and long life.

Crank rocker mechanism: A hinged four-bar mechanism with one crank and one rocker is called a crank rocker mechanism. Normally, the crank is the driving member and rotates at equal speed, while the rocker swings back and forth for the follower for variable speed, and the connecting rod moves in a plane compound motion. The rocker is also used as an active component in the crank rocker mechanism, and the reciprocating swing of the rocker is converted into the rotation of the crank.

Working principle: When the button is pressed, the turbine located at the rear of the motor is in contact with the worm and rotates under the drive of the worm: driven by the worm gear and worm drive, the gear below rotates, and the rocker connected to it can swing at a certain angle under its drive, so as to achieve the purpose of letting the fan swing its head back and forth.

NO2. Myopia eye surgery: The principle is actually very simple, which is to cut the cornea into a "contact lens".

NO3. How the zipper works:

NO4. The working principle of the sewing machine:

NO5. Grenade explosion: