Do you know what principles they(Gears) use

We have seen many products that apply gears in life, but do you know what principles they use?

According to its working principle, the gear has the following functions:

First, gears can transmit mechanical power, such as automobile gear shifting devices, industrial gearboxes, etc;

Second, gears can change the direction of motion, such as mechanical watches, shaking devices in electric fans, etc;

Third, gears can reduce speed and reduce speed. Improve torque, such as motor reducer, various speed change mechanisms, etc.

Gear speed change structure

Here are two interesting applications of gears in automobiles and aviation, to see the role of gears in them.

There is a mechanical structure in the car called the differential, which is an extremely important part. When the car turns, the speed of the inside and outside of the wheel is not the same, if there is no differential, the speed of the inside and outside wheels is the same, the car will not be able to turn, or even if it can turn at low speed, because of one side The wheels slipped and rolled over. Moreover, the car is very fast, and it is absolutely impossible to do without a differential at high speeds. The gears here are on the differential, which can not only transmit the power of the engine, but also reduce the speed through different speed ratios of the gear device, and at the same time, it can also achieve a very cool "differential" function.

Differential 3D Model

Differential schematic

In aviation, helicopters using coaxial inversion technology are favored by many countries because of their excellent performance. This helicopter has two propellers on the same shaft. When the aircraft is flying, the rotation directions of the two propellers must be opposite to ensure the dynamic balance of the aircraft.

Helicopter with coaxial reversal technology

It can be seen from the three-dimensional model of the coaxial reversal structure that the gear changes the mechanical transmission direction smoothly after two transformations, and realizes two different rotation directions on the same shaft, which is very interesting. (Of course, the actual structure of the helicopter is not so simple.)

Coaxial Inversion Model

Regarding the application of gears, do you know of any other interesting product structures? Welcome to leave a message to share!