Clutch - Td5 (Description): Description and operation (page 3 of 4)

The dual mass flywheel is used to insulate the gearbox from torsional and transient vibrations produced by the engine. The flywheel comprises primary and secondary flywheels with the drive between the two transferred by a torsional damper which comprises four coil springs. The springs are located in the inside diameter of the primary flywheel. Two of the springs are of smaller diameter and fit inside the larger diameter springs.

The primary flywheel locates the ring gear and is attached to the crankshaft flange with eight bolts. The two pairs of coil springs are located in a recess in the flywheel between two riveted retainers. A roller bearing is pressed onto the central boss of the primary flywheel and retained with a riveted plate. The bearing provides the mounting for the secondary flywheel.

The secondary flywheel comprises two parts; an outer flywheel which provides the friction surface for the clutch drive plate and an inner drive plate which transfers the drive from the primary flywheel, via the coil springs, to the outer flywheel. The two components of the secondary flywheel are secured to each other with rivets. The inner drive plate is located between the two pairs of coil springs and can rotate on the ball bearing in either direction against the combined compression force of the four coil springs. Under high torque loading conditions the secondary flywheel can rotate in either direction up to 70° in relation to the primary flywheel.

The operating face of the secondary flywheel is machined to provide a smooth surface for the drive plate to engage on. Three dowels and six studs and nuts provide for the location and attachment of the pressure plate.

Pressure plate

1 Leaf spring 2 Drive plate 3 Pressure plate 4 Cover 5 Diaphragm 6 Rivet