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The operating principle of a tractor
Release Time:
2025-06-27 14:11
Movement is achieved through the power of the internal combustion engine, transmitted through the drivetrain to provide driving torque Mk to the drive wheels. The drive wheels, via tire tread and surface, exert a small, rearward horizontal force (tangential force) on the ground. The ground, in turn, exerts an equal and opposite horizontal reaction force Pk, which is the driving force (also called thrust) that propels the tractor forward. When the driving force Pk is sufficient to overcome the rolling resistance of the front and rear wheels and the drawbar pull of the implements, the tractor moves forward. If the drive wheels are lifted off the ground, the driving force Pk becomes zero, and the drive wheels will only spin in place; the tractor cannot move. Similarly, if the sum of rolling resistance and drawbar pull exceeds the driving force Pk, the tractor cannot move. Therefore, the movement of a wheeled tractor is achieved through the interaction between the drive wheels and the ground, and the driving force must be greater than the sum of rolling resistance and drawbar pull.
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