Chapter 4. clutch system
GENERAL DESCRIPTION.
The clutch is a device to engage and disengage the power of the engine.The construction of the clutch is
as shown in the figure. It is composed of the flywheel which holds the clutch disc,the pressure
plate,diaphragm springs,the clutch cover,and input gear.
The plate is held against the flywheel by the pressure springs and pushes the clutch disc against the
flywheel.The clutch disc,which is sandwiched between the pressure plate and the flywheel,is mounted
on the splined part of the input gear.It can move in an axial direction,but is locked in the rotational
direction.It transmits engine power to the transmission by means of friction.Twelve coil spring are
installed between the clutch cover and the pressure plate along the circumference,which are the
pressure springs.
To disengage the engine power,the force of the diaphragm spring acting on the pressure plate must be
eliminated.For this purpose the release lever is installed.By depressing the clutch pedal, the release
lever pushes off the pressure plate from the clutch disc,thus providing clearance between the friction
surfaces of the flywheel,the clutch disc,and the pressure plate.Thus the engine is disengaged.
Fig.4-1 Main clutch disc.
4-1
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