What simple machines are used for the main parts of tractors? How do they work?

Well, I'll tell you something based on my personal experience and understanding.

First, the engine, mainly the power source, works on a simple principle. Oxygen and diesel are injected into the combustion chamber, and then compressed by the flywheel flyer gearbox to generate power.

Behind the engine is a gearbox, which mainly converts the single speed output by the engine into many speed classes, and then adjusts the speed according to different working conditions. The principle is to change the transmission ratio to change the walking speed and required torque.

Behind the gearbox is a hydraulic lifting system. Hydraulic lifting system is mainly used to hook the required farm tools. Some farm tools need tractors to carry them to work, and the hydraulic lifting system can do it. The working principle of hydraulic system is to use the principle that liquid is incompressible. The hydraulic power comes from the hydraulic oil pump and then drives the hydraulic oil. Because hydraulic oil cannot be compressed, work must be done. Then, by changing the oil circuit and then entering different oil circuits, the hydraulic cylinder is pushed to extend.

Behind it is the power output, that is, the secondary power of the tractor, which outputs power to the farm tools attached to the tractor, because some farm tools can't work or have no power source, and then the tractor gives an output shaft at the back of the ass as the power source of the farm tools behind it, so long as the transmission shaft is attached, it can output power.

Say so much for the time being, ask what you want to know!