The role of car clutch

The role of car clutch

The clutch is located in the flywheel housing between the engine and the gearbox. The clutch assembly is fixed on the rear plane of the flywheel with screws. The output shaft of the clutch is the input shaft of the gearbox. During the driving of the car, the driver can step on or release the clutch pedal as needed to temporarily disengage and gradually engage the engine and the transmission to cut off or transfer the power input from the engine to the transmission.

The main functions of the clutch are:

1. Make sure the car starts smoothly

Before starting, the car is at a standstill. If the engine and the gearbox are rigidly connected, once the gear is engaged, the car will suddenly rush forward due to the sudden connection of the power, which will not only cause damage to the parts, but also the driving force is not enough to overcome the forward rush of the car. The huge inertial force generated causes the engine speed to drop sharply and stall. If the engine is temporarily disengaged from the gearbox with a clutch at the start, then the clutch is gradually engaged. Due to the slippage between the active part and the driven part of the clutch, the torque transmitted by the clutch can be gradually increased from zero. And the driving force of the car is gradually increasing, so that the car starts smoothly.

2. Easy to shift

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 and the gearbox, the transmission gears meshed in the gearbox will be difficult to separate due to the large pressure between the meshing tooth surfaces because the load is not removed. Another gear to be meshed will be difficult to mesh due to the unequal circumferential speed of the two. Even if it is forced into meshing, it will produce a large impact of the tooth end, which is easy to damage the machine parts. Using a clutch to temporarily disengage the engine and the gearbox before shifting, the original pair of gears is removed due to the load, the pressure between the meshing surfaces is greatly reduced, and it is easy to separate. For the other pair of gears to be meshed, since the driving gear and the engine are separated, the moment of inertia is very small, and the gear shifting can make the peripheral speed of the gears to be equal or close to equal, so as to avoid or reduce the impact between the gears.

3. Prevent overloading of the drive train

When the car brakes suddenly, the wheels suddenly slow down suddenly, and the drive system connected to the engine maintains the original speed due to the inertia of rotation. This often produces an inertia moment in the drive system that is much greater than the engine torque, making the drive system Parts are easily damaged. Because the clutch transmits torque by friction, when the load in the transmission exceeds the torque that can be transmitted by friction, the main and driven parts of the clutch will automatically slip, thus preventing the overload of the transmission. .

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