What is a one-way clutch, and what is it used for?

Electric Start Overrunning Clutch (also known as a one-way clutch) The clutch, also called the “flywheel clutch,” is a device that transmits power from the car engine to the axle in a switch-like manner. In gasoline-powered vehicles, the engine runs continuously while the vehicle is in motion.

However, to meet driving requirements such as stopping and shifting gears, a mechanism must be incorporated at the engine's external connection point. This mechanism interrupts power transmission as needed, enabling the vehicle to remain stationary or change gears while the engine continues running. This mechanism is the power transmission device. The clutch mechanism is positioned between the engine and the manual transmission, responsible for transferring engine power to the transmission.

When the clutch pedal is released, pressure plates within the flywheel, driven by spring force, firmly press against the friction plates. This creates a non-slip connection between them, enabling power transmission from the engine to the transmission. When the pedal is depressed, the mechanism compresses the springs, causing their outer edges to lift. This action disengages the pressure plate from the friction plates.

At this point, the friction plates and flywheel are no longer connected. Even if the engine continues to run, power is not transmitted to the transmission or wheels. This allows the driver to shift gears or stop the vehicle without stalling the engine.