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The clutch function
- Aug 18, 2018 -

1. Ensure a smooth start of the car

If the engine is rigidly connected with the gearbox before starting, once the gear is put into gear, the car will be suddenly connected with the power to rush forward, which will not only cause damage to the parts, but also the driving force is not enough to overcome the huge inertia generated by the car's forward thrust, causing the engine speed to drop sharply and stall.If you use the clutch will temporarily when starting the engine and transmission, and clutch joint gradually, as a result of the clutch friction exists between the active part and the driven part of the phenomenon, can make out of the clutch torque by zero increase gradually, and the car driver is increased gradually, so that the motor start smoothly.

2. Convenient to shift gears

In the process of driving, different gearbox gears are often used to adapt to the changing driving conditions.If there is no clutch to temporarily separate the engine from the gearbox, then the meshing transmission gear in the gearbox will not be removed due to the load, and the pressure between the meshing tooth surfaces will be too high to be separated.Another pair of meshing gears will be difficult to mesh due to their different circular speeds.Even if forced into mesh will also produce a large tooth end impact, easy to damage parts.When the clutch is used to separate the engine and gearbox temporarily and change gears, the original meshing pair of gears can be easily separated due to the unloading of the load.The other pair of gear to be engaged, because the moment of inertia of the driving gear is very small when the driving gear is separated from the engine, the circumferential speed of the gear to be engaged can be equal or close to the same with the proper shift action, so as to avoid or reduce the impact between the gears.

3. Avoid overload of the transmission system

When the car is in emergency braking, the wheel suddenly drops sharply. However, the transmission system connected with the engine still maintains its original speed due to the inertia of rotation, which often produces the inertia torque far larger than the engine torque, making the parts of the transmission system easily damaged.As the clutch relies on the friction to transfer torque, when the load in the transmission system exceeds the torque that the friction can transfer, the main and driven parts of the clutch will automatically skid, thus preventing the overloading of the transmission system.

4. Reduce torsional impact

The working principle of automobile engine determines the instability of output torque.In the power stroke, the combustion chamber gas explosion produces a great deal of impact torque, while in other strokes, it is the inertial reverse tow engine.Although the inertia of the engine rotation system can reduce the torsional vibration, the residual impact force still has a negative impact on the following gearbox and transmission shaft.The damping spring (tangential distribution) in the clutch can significantly reduce the torsional vibration impact brought by the engine and extend the life of the variable gear.

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