In general, the former is more comm

In general, the former is more commonly used. Of course, in an automatic transmission, the use of a one-way clutch is not limited to the actuator. For example, a unidirectional clutch is also used in the guide wheel support of the hydraulic torque converter.A one-way clutch (often called a one-way bearing) is also an essential component of a mechanical transmission and can only be transmitted in one direction (clockwise or counterclockwise).When the power supply drives a passive component, it can only drive in a single direction. If the direction of the power supply changes (e.g. clockwise to counterclockwise), the passive component will automatically disintegrate from the non-power transmission function.The unidirectional clutch has two modes of movementWhen the power output part of the one-way clutch (inner or outer ring) is faster than the speed of the power source (outer or inner ring), the clutch is in the release state, and there is no linkage between the inner and outer ring, which is called the one-way overtaking function of the one-way clutch.1. Make sure the car starts smoothlyThis is the main function of the clutch. It is natural to start the engine before the car starts. As the car starts, it accelerates gradually from a complete standstill. If the driveline is firmly attached to the car and engine, the car will suddenly shoot forward once the gearbox is put into gear, but it won't start. This is because the car from stationary to forward, will produce a lot of inertia force, causing a lot of resistance torque to the engine. Under the action of this moment of inertia, the engine speed drops sharply to below the minimum steady speed in the instantaneous time, and the engine stops running and can not work. Of course, the car wouldn't start. Therefore, we need the help of the clutch. After the engine starts and before the car starts, the driver first presses the clutch pedal to disengage the engine from the gearbox system, then shifts the gearbox and gradually releases the clutch pedal to engage the clutch gradually. During engagement, the resistance torque of the engine increases gradually, so the accelerator pedal should be lowered gradually at the same time, that is, the fuel supply to the engine is gradually increased, so that the engine speed is always kept at zero. Maintain a minimum steady speed without stalling. At the same time, as the degree of clutch engagement gradually increases, the torque transferred 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 will start moving from a static state and gradually accelerate. 2. Ensure the smooth operation of the transmission system when shifting gears