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The periphery
of
the diaphragm
is
held
to
the
pressure plate by distributed clips: the diaphragm
periphery pulls the pressure plate through these
clips when the release bearing pushes the tips
of
"fingers,"
~ften
referred
to
as
tapering fingers
because
of
their appearance.
A totpl
of
six bolts are used
to
secure the
clutch cover
to
the flywheel.
Of
these bolts, two
are reamer bolts.
Diaphragm spring
This spring
is
made by press-working a spring-
steel plate and by heat-treating
to
provide a
spring characteristic needed for its
duty
in the
clutch. The obtained characteristic
is
illustrated
in terms
of
plate pressure
as
a function
of
plate
position. Note
that
the pressure available in
initial condition
is
slightly below
the
maximum,
which occurs when
the
plate displaces itself
toward flywheel due
to
the
initial wear
of
facings.
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28.
Displacement
of
pressure plate
Diaphragm spring
CLUTCH SYSTEM
Outch
disc
The disc
is
splined
to
the transmission main
shaft;
it
is
normally pressed against flywheel
by
pressure plate (in the engaged condition
of
the
clutch).
It
is
constructed light in weight
but
sized large enough for
the
powerful
torque
the
clutch has to
conduct
from
the
diesel engine.
Lightweight
or
small inertia
is
what
is
needed for
smooth
gear change in
the
transmission.
Its facings are riveted to
the
cushioning plate,
which
is
attached through six torsion springs and
retaining plate
to
the
clutch plate integral with
the splined hub.
For
avoiding slippage in convey-
ing torque, a special woven material containing
wire
is
used for
the
facings.
The
torsion springs,
through which drive flows from cushioning plate
to
clutch plate dampen torsional shocks and
pulsations during a standing start and during
operation
on
rough ground.
Radial grooves are provided in
the
face
of
the
facing
as
a means
of
preventing abnormal tem-
perature rise in the facing, thereby increasing its
durability
Clutch plate
Facing
Facing rivet
Cushioning plate
Torsion spring
Splined
hub
-IF===::;'1
Friction
plate
Stop pin
Retaining plate
3-3
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