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The function of automotive clutch (GRTECH Parts)

- Sep 27, 2018 -

Clutch Position Description:

The clutch is located in the flywheel housing between the engine and the transmission, and the clutch assembly is fixed to the rear plane of the flywheel by screws, and the output shaft of the clutch is the input shaft of the transmission. During the driving of the vehicle, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and the transmission to cut off or transmit the power input by the engine to the transmission. Clutch engagement state Clutch off state.

The main functions of the clutch : 

  1. Ensure that the car is at a standstill before the start of the car.

    If the engine and the gearbox are rigidly connected, once the gear is engaged, the car will suddenly thrust forward due to sudden power. Not only will the damage of the machine parts be caused, but also the driving force is not enough to overcome the huge inertial force generated by the frontal thrust of the car, causing the engine speed to drop sharply and extinguish the flame. If the clutch is temporarily used to separate the engine from the transmission at the start, and then the clutch is gradually engaged, the torque transmitted from the clutch can be gradually increased from zero due to the slipping phenomenon between the active portion and the driven portion of the clutch. The driving force of the car is also gradually increased, so that the car starts smoothly.

  2. Easy to shift gears During the driving process, different gearbox positions are often used to adapt to changing driving conditions. If there is no clutch to temporarily separate the engine from the transmission, the meshing gears in the transmission will not be removed due to the load, and the pressure between the meshing surfaces will be large and difficult to separate. The other gear to be meshed is difficult to engage due to the unequal circumferential speed of the two. Even if it is forcibly engaged, it will cause a large tooth end impact and easily damage the machine. When the engine and the transmission are temporarily separated by the clutch and then shifted, the original pair of gears are removed by the load, and the pressure between the meshing surfaces is greatly reduced, so that it is easy to separate. The other pair of gears to be engaged, because the driving gear is separated from the engine, the moment of inertia is small, and the appropriate shifting action can make the circumferential speeds of the gears to be meshed equal or nearly equal, thereby avoiding or reducing the impact between the gears.

  3. Prevent the drive train from overloading When the vehicle is in emergency braking, the wheel suddenly drops sharply, and the drive train connected to the engine maintains the original speed due to the inertia of rotation, which tends to generate much more than the engine torque in the transmission system. The moment of inertia makes the parts of the drive train susceptible to damage. Since the clutch transmits torque by the friction force, when the load in the drive train exceeds the torque that can be transmitted by the friction force, the main and driven parts of the clutch will automatically slip, thus preventing the transmission system from being overloaded. .

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