What are the main functions of automobile clutches

What are the main functions of automobile clutches

　　 1. Ensure the car starts smoothly

　　 This is the primary function of the clutch. Before the car starts, it is natural to start the engine first. When the car starts, the car gradually accelerates from a completely stationary state. If the drive train (which links the entire car) is rigidly connected to the engine, as soon as the transmission is put into gear, the car will suddenly rush forward, but it will not start. This is because when the car goes from a standstill to a forward collision, it produces a large inertia force, which causes a large drag torque on the engine. Under the action of this inertial resistance moment, the engine speed drops sharply below the lowest stable speed (generally 300-500RPM) at a momentary time, the engine stops and cannot work, and of course the car cannot start.

clutch

　　 Therefore, we need the help of the clutch. After the engine is started and before the car starts, the driver first steps on the clutch pedal to disengage the clutch to disengage the engine and the driveline, then put the transmission in gear, and then gradually release the clutch pedal to gradually engage the clutch. During the engagement process, the resistance torque received by the engine gradually increases, so you should gradually step on the accelerator pedal at the same time, that is, gradually increase the fuel supply to the engine, so that the engine speed is always maintained at the lowest stable speed without stalling. At the same time, as the degree of engagement of the clutch gradually increases, the torque transmitted from the engine to the driving wheels through the driveline gradually increases. When the traction force is sufficient to overcome the starting resistance, the car starts to move from a standstill and gradually accelerates.

　　2.To ensure that the transmission system works smoothly when shifting gears

　　During the driving of a car, in order to adapt to changing driving conditions, the transmission system often needs to be changed to different gears. To realize the gear shift of the gear transmission, it is generally to toggle a gear or other gear-in mechanism to push out a gear pair in the original gear position for transmission, and then make the gear pair in another gear position enter work. The clutch pedal must be depressed before shifting to interrupt the power transmission to facilitate the disengagement of the meshing pair of the original gear. At the same time, the speed of the meshing part of the new gear meshing pair gradually tends to be synchronized, so that the impact when entering the mesh can be greatly increased. Reduced to achieve smooth shifting.

3. To prevent overload of the drive train. When the car is in emergency braking, if there is no clutch, the engine will be rigidly connected with the drive train to reduce the speed sharply, so all the moving parts will generate a large moment of inertia (its value may greatly exceed The maximum torque issued by the engine during normal operation) causes a load exceeding its carrying capacity to the drive train and damages the mechanical parts. With the clutch, you can rely on the possible relative movement between the driving part and the driven part of the clutch to eliminate this danger. Therefore, we need a clutch to limit the maximum torque of the drive train and ensure safety.