clutch
of
the
MITSUBISHI Tractors
MTI80/D
and
MTI80H/HD
is
a
dry single-plate clutch
of
diaphragm-spring type.
This clutch, instead
of
coil springs and release
levers acting on the pressure plate in the conven-
tional type clutch, uses the diaphragm spring,
looking like a round disc,
to
perform the
functions
of
coil springs andrelease levers.
The diaphragm, made
of
spring steel, has
equally spaced slits extending radially inward.
Because
of
these slits, what are called "tapering
fingers" are formed: the tapering fingers corre-
spond to the conventional release levers. In
the normal engaged state
of
the clutch, the
diaphragm loads upon the pressure plate to
keep
it
pressed against flywheel. Clutch disen-
gagement
or
releasing action
is
effected by
pushing the tips
of
the fingers
to
lift
the
pressure
plate away from the facings
by
the
outer
edges
of
the diaphragm. In other words, the diaphragm
behaves
as
if
it consists
of
a countless number
of
release levers.
The advantage
of
the diaphragm-spring clutch
over the conventional coil spring clutch may be
summarized
as
follows:
CLUTCH SYSTEM
(I)
A less force
is
required
to
release the clutch
and, consequently, the clutch pedal "feels"
light. This reduces the operator's fatigue.
(2) During
the
initial wear
of
clutch facings,
the urging force
of
the diaphragm spring
increases.
It
is
when maximum urging force
is
attained
that
it
begins to weaken in step
with the progressive wear
of
facings. Thus,
the diaphragm spring lasts longer than the
coil springs.
(3) In high speed condition, the diaphragm
is
less subject to centrifugal strain and assures
more stable torque transmission.
(4) The clutch
is
built with a less
number
of
parts, so that, because
of
its simpler con-
struction,
it
is
more trouble-free.
(5) Being a circular disc, the diaphragm spring
exerts its spring force
on
the entire periph-
ery
of
the pres.sure plate. This explains why
the pressure plate
as
well
as
the diaphragm
itself
is
not
subject to distortion.
For
the
MTI60/D,
MTI80/D
and
MTI80H/
HD tractors,
the
diaphragm-spring clutch is sized
large enough
in
capacity for
the
maximum
torque
that
it
has to convey from engine
to
transmission, and is built sturdy
to
ensure its
trouble-free service.
3·1
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