What is the primary function of the clutch disc?

The primary function of the clutch disc is to connect the engine to the transmission. This connection allows engine power to be transmitted to the wheels through the drivetrain when the clutch is engaged. When the driver presses the clutch pedal, the disc disengages from the flywheel, interrupting power flow. This allows the driver to change gears smoothly without grinding them, as the connection between the engine and transmission is temporarily broken.

While damping engine vibrations is an important function of other components, such as the flywheel, the clutch disc's main role is purely about connecting and disconnecting power. The clutch assembly overall serves several purposes, but the disc’s primary responsibility is facilitating that engagement and disengagement with precision. It does not serve as a gear selector, as that role is handled by different components within the transmission, nor does it hold the pilot bearing; rather, the bearing is situated in a way that allows for smooth rotation during use.