DIESEL ENGINE
05
SERIES
WSM,
01640
(3)
Dumping
Valve
I
1
I‘
I
11
79OF10280
(4)
Injection Control
11 1900F10160
1.
At
fuel injection
Since dumping valve is pushed up to press the
spring, fuel is pressure-fed to injection nozzle the same
as without dumping valve.
2.
At
suck-back
At suck-back by delivery valve after fuel injection fuel
returns through dumping valve orifice. Generally second
injection is apt to occur by reflex pressure due to
reaction of sudden pressure drop when changing into
suck-back by delivery valve
from
high injection pressure.
As
a result of preventing this second injection
perfectly
by
dumping valve and dissolving nozzle
clogging, durability of injection nozzle is improved.
11790M10251
1.
No
fuel delivery
At the engine stop position
of
the control rack
(3),
the
lengthwise slot
(1)
on the plunger
(2)
aligns with the feed
hole
(5). And the delivery chamber
(4)
is led to the feed
hole during the entire stroke
of
the plunger.
The pressure
in
the delivery chamber does not build
up and no fuel can
be
forced to the injection nozzle.
2.
Fuel delivery
The plunger
(2)
is rotated (see figure) by the control
rack
(3).
When the plunger is pushed up, the feed hole
(5)
is
closed. The pressure in the delivery chamber
(4)
builds
up and forcefeeds the fuel to the injection nozzle until
the control groove
(6)
meets the feed hole
(5).
The amount
of
the fuel corresponds to the distance
“A”.
(1)
Slot
(2)
Plunger
(3)
Control
Rack
(4)
Delivery
Chamber
(5)
Feed Hole
(6)
Control
Groove
119OOM10181
M-29
Redistribution or publication of this document,
by any means, is strictly prohibited.
To Next Page
Loading...
