in touch with the full·load stopper, shifter will directly
came
in touch the tension·lever along
with
the
rise
of
r.p.m. Accordingly, the ungleich·spring will
be
pressed
under a fixed
condition (Fig.
8,
Fig. 9).
With the result
of
such
movement
as
above, the guide·lever and the control· rack move in
the
"STOP"
direction up
to
the corresponding volume
of
ungleich and
"ungleich"
the
jet
volume.
When
the machine
reaches
the full·load and the centrifugal force wins over the '
tension
of
the governor·spring, the tension·lever
is
pushed
back. The shifter, the guide·lever
and the control·rack move in the direction
of
"STOP" and obtain a new balance
at
the place
where
small
jet
volume suitable
to
the load condition
of
engine
may
be
obtained.
4. Work
of
Ungleich
The fuel supplying curve
is
shown in Fig. 10. In this figure the fuel, which will burn
smokelessly
(smoke·limit) at the regular r.p.m.
and
at a fixed load
is
ploted by inspecting the
jet
condition against engine cylinder per
each
stroke adopting the r.p.m.
as
parameter. The
of
"*~~-=---~-A=-~
1
..........................
1..-
.........
~
:!'
.;:
~
Nl
•• p.
m.
of
En9ne
N2
Fig. 10
fuel jetting volume curve in the
same
figure
is
shown at the full·load position
of
the
control·rack by adopting the fuel jet volume which
is
supplied by the injection pump per
each
stroke
as
function. This fuel demanding curve
shall
be
made
similar
to
the fuel outlet
curve
within
the
limit
of
possibility.
In
other words, the fuel
necessary
for
engine shall
be
injected smokelessly
so
as
to
operate engine
without
hindrance.
Fig.
10
shows
the following facts: The demand
for
engine
fuel
decreases
as
the r.p.m.
rises
(worse condition
of
air inhalation),
on
the other hand, the injection pump, when
~e
control rack placed on a fixed condition, injects more fuel
as
the r.p.m.
rises.
No
engine
can
burn (consume) this increased fuel
without
giving
out
smoke.
If
the maximum
jet
volume
of
the injection pump
is
adjusted
to
themaximum r.p.m.
of
the engine
so
as
to
meet the
requirement at full·load condition the r.p.m.
of
the
engine
is
lowered and sufficient
output
cannot
be
obtained. In
an
ordinary
case,
therefore, the maximum jetting vplume of the
-
43-
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