1. Ensure the car starts smoothly: The car is in a stationary state before starting. Once the car is put into gear, the car will suddenly rush forward due to the sudden power. This will not only cause damage to the mechanical parts, but also the driving force will not be enough to overcome the huge inertia generated by the car's forward rush. , causing the engine speed to drop sharply and stall; 2. Easy to shift gears: During driving, the car often switches to different gearbox gears to adapt to changing driving conditions;
3. Prevent the overload of the transmission system: When the car is under emergency braking, the wheels suddenly decelerate sharply, and the transmission system connected to the engine still maintains its original speed due to the inertia of rotation, which often produces a torque in the transmission system that is much greater than the engine torque. The moment of inertia makes the parts of the transmission system easily damaged. Since the clutch relies on friction to transmit torque, when the load in the transmission system exceeds the torque that can be transmitted by friction, the main and driven parts of the clutch will automatically Slip, which plays a role in preventing overload of the drive train;
4. Reduce torsional vibration impact: The working principle of a car engine determines the instability of its output torque. The gas explosion in the combustion chamber produces a huge impact torque, while in other strokes, the engine is dragged back by inertia.
