If the engine and gearbox are temporarily disengaged by the clutch when starting, the clutch gradually engages. Due to the slippage between the clutch driving member and the driven member, the torque of the clutch can gradually increase from zero, and the driving force of the car will also gradually increase, thereby making the car run smoothly.
In the course of driving, different gearboxes are often used to adapt to changing driving conditions. If there is no clutch to temporarily disengage the engine from the gearbox, the meshing gearbox gears in the gearbox will be difficult to disengage because the load is not removed and the pressure between the meshing tooth surfaces is very high.
Another method of handling meshing gears is that it is difficult to mesh because their peripheral speeds are not equal. Even if it is forcibly engaged, it will have a great impact on the tooth end and easily damage the machine parts. When the engine and gearbox are temporarily disengaged by the clutch, the original pair of gears are easily disengaged due to the reduced load, and the pressure between the meshing surfaces will be greatly reduced.
For another pair of gears to be meshed, due to the small rotational inertia of the driving gear after being separated from the engine, proper gear shifting can make the peripheral speed of the gears equal or close to this, thereby avoiding or reducing the impact between the two gears. Even gears.
When an automobile brakes in an emergency, the wheels suddenly slow down suddenly, and the transmission system connected to the engine maintains its original speed due to the moment of inertia. This usually produces a moment of inertia much greater than the engine torque in the transmission system. This makes the components of the transmission system vulnerable to damage.
Because the clutch transmits torque through friction, when the load in the transmission system exceeds the torque transmitted by friction, the main and driven parts of the clutch will automatically slip, thereby preventing the overload of the transmission system.
The working principle of an automobile engine determines its unstable output torque. During the working stroke, the gas explosion in the combustion chamber generates a large impact torque, while in other strokes, it depends on the inertial anti-trail engine.
Although the inertia of the engine's rotating system can reduce torsional vibration, the remaining impact still has a negative effect on the subsequent gearbox and transmission shaft. The shock absorber spring (distributed tangentially) in the clutch can significantly reduce the torsional vibration generated by the engine and extend the service life of the gear.