Car starter in the role of the one-way clutch

1, to ensure a smooth start car

This is the primary function of the clutch. In the car started before, the natural first start the engine. The car started, the car is completely stationary state from the gradual acceleration. If the drive system (which links the entire vehicle) rigidly contact with the engine, the transmission is in gear a car will suddenly look forward, but it does not start. This is because the car from a standstill to pediment, have a great inertial force, causing the engine drag torque greatly. In this moment of inertial resistance effect, a sharp decline in the blink of time the engine speed to the minimum stable speed (usually 300-500RPM) or less, that is, the engine stalled and can not work, of course, cars can not be started.

Therefore, we need the help of the clutch. After engine start, before the car started, the driver first depresses the clutch pedal, the clutch, the engine and drive train is disengaged, then the transmission is in gear, and then gradually release the clutch pedal, the clutch is gradually engaged. In the bonding process, the engine torque is increased gradually blocked, it should also gradually depress the accelerator pedal, the gradual increase in the amount of fuel supplied to the engine, the engine's speed is always maintained at a minimum stable speed, and will not turn off. Meanwhile, the tightness of clutch engagement increases, the engine torque is transmitted to the drive wheels via the transmission line will be gradually increased, to the traction force sufficient to overcome the initial resistance, car starts moving from standstill and gradually accelerate 2, to ensure drivetrain swap slotting work smoothly

2, to achieve a smooth shift

In the car driving process, in order to adapt to changing driving conditions, drive train often work to replace the different stalls. Shift the gear type transmission, or other generally toggle gear-gear mechanism, to allow use of a gear transmission gear pair launched, then make another shift gear pairs into the work. In the clutch pedal before shifting to interrupt power transmission, facilitates engaging former deputy disengaged gear, while the speed of the new gear engaged with the engagement portion of gradually becoming deputy synchronized into the impact of such engagement can be greatly reduced, to achieve smooth shifting.

3, to prevent transmission system overload

Issued when the vehicle is braked, if no clutch, the engine and the drivetrain will vary sharply reduce rigid connection speed, and thus where all the moving parts will have a great moment of inertia (its value may be much higher than normal engine work The maximum torque), causing the drive system load exceeds its capacity, leaving mechanical damage. With the clutch, the clutch can rely on the active part and the relative movement may occur between the driven part to eliminate this risk. Therefore, we need to limit the maximum torque clutch transmission system is subjected, and ensure safety.