Tractor Driving Principle

The driving wheel relies on the power of the internal combustion engine through the transmission system to obtain the driving torque Mk. The driving wheel obtains the driving torque and then exerts a small, backward horizontal force (tangential force) on the ground through the tire pattern and tire surface, while the ground A horizontal force Pk acts on the tractor with equal magnitude and opposite direction. This Pk force is the driving force that pushes the tractor forward (also called propulsion force). When the driving force Pk is sufficient to overcome the forward rolling resistance of the front and rear wheels and the traction resistance of the farm implements, the tractor will move forward. If the driving wheels are separated from the ground, that is, the driving force Pk is equal to zero, the driving wheels can only idle on the spot and the tractor cannot move; if the sum of rolling resistance and traction resistance is greater than the driving force Pk, the tractor cannot move either. It can be seen that the driving of a wheeled tractor is achieved by the interaction between the driving torque and the ground, and the driving force is greater than the sum of rolling resistance and traction resistance.