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Friction washers
During engine start-up, a high angular deflection
occurs between the two inertias. To limit this
deflection and help improve engine start-up, friction
washers are added on certain applications. They do
not operate in drive mode.
Cover
The cover is welded to the primary flywheel to form
a sealed chamber containing the curved springs,
spring guides and the grease.
Bearing or bushing
The bearing or bushing is an interface between the
two inertias during angular displacement. The first
design contains only a bearing. The bushing has only
recently been introduced into production.
5.2. Secondary Inertia (mass)
The secondary flywheel is a cast iron component.
One side is machined to form the friction surface
of the disc. The secondary flywheel transmits the
engine torque to the clutch, the gearbox and the
wheels.