6-2-3
VARIATION IN QUANTITY
OF
FUEL
TO
BE
INJECTED
The quantity of fuel injected varies according to the condition of the engine,
i.
e. high
speed
or
low speed operation and loaded
or
unloaded operation.
(See
Figs.
63
and
64.)
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.
I
(1
1
RELATION BETWEEN THE PLUNGER
AND
THE BARREL
SUCT
PLUNGER BARREL
'ION
/
DELIVERY
PORT
LEAD
PLUNGER
INJECTION INJECTION INJECTION INJECTION
STARTS. ENDS. STARTS
,
ENDS.
MAX.
DELIVERY HALF DELIVERY
NO
DELIVERY
FIG.
63
(2)
RELATION BETWEEN THE PLUNGER AND THE
RACK
NTROL SLEEVE
MAX. DELIVERY
HALF DELIVERY
FIG.
64
NO DELIVERY
-
41
-
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