The function of the car clutch
1. Ensure that the car starts smoothly
Before the start, the car is at a standstill. If the engine and the gearbox are rigidly connected, once the gear is engaged, the car will suddenly thrust forward due to the sudden connection of the power, which will not only cause damage to the machine, but also the driving force is not enough to overcome the car front. The huge inertial force generated causes the engine speed to drop sharply and turn off. 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 that are engaged in the transmission are not removed due to the load, and the pressure between the meshing surfaces is 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 forced into the mesh, 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 the rotation, which often produces a moment of inertia in the transmission system that is much greater than the engine torque, so that the drive train Parts are easily damaged. Since the clutch transmits torque by friction, 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 drive line from being overloaded. .
