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3.
Variation in quantity
of
fuel
to
be injected
The quantity
of
fuel injected vanes according to the condition
of
the engine, i. e. high speed or low speed operation and
loaded or unloaded operation. (See Figs.
55
and
56.)
The plunger lead is engraved
on
the surface of plunger in
an
inclined curve. By rotating the plunger, the distance between
the upper part
of
the plunger and the suction port
is
varied. (Variation in effective stroke)
Rotation
of
the plunger
is
made by the control rack. When this control rack
is
shifted to left and/or right, the geared pinion
rotates,
which
is connected to the plunger
by
means of the control sleeve. In other words, the plunger turns as much amount
as the rack rotates. Accordingly, the effective stroke varies coincident with the position where the rack is set.
1)
Relation between the plunger and the barrel
EFFECTIVE STROKE
PLUNGER BARREL
INTAKEEXHAUST
PORT
INJECTION INJECTION INJECTION INJECTION
STARTS. ENDS. STARTS. ENDS.
MAX.
DELIVERY
HALF DELIVERY
NO DELIVERY
Fig.
55
2)
Relation between the plunger and the rack
CONTROL SLEEVE
MAX.
DELIVERY
HALF
DELIVERY
NO DELIVERY
Fig.
56
-
30
-