6-3
FUEL
INJECTION
NOZZLE
6-
3-
1
SPECIFICATfONS
I
Part Name
NOZZLE ASSEMBLY
/-
Type
No.
4
No.
of
nozzle hole
DLLA150PN52
(Diameter)
195
kg/
ern'
Valve opening pressure
(0.22
mm)
Spring constant
13.2
kg/ mm
I
6-
3-
2
FEATURES
Both the injection nozzle and the injection pump are very important
parts
for producing
fuel mist
for
combustion. There are two types
of
injection nozzle, one is hole type
and
the other
is
pintle type.
The injection nozzle for DY23 and DY27 Diesel engines is developed as a result of joint
research and development project by Diesel Kiki and our company, and it
is
direct
combustion system, having the special hole type nozzle.
For producing better air-fuel mixture,
it
utilizes
swirl
and squish
flows
and deliver the
fuel mist most effectively, injection pressure
is
raised
up
to 195 kg/cm2.
6-3-3 STRUCTURE
OF
THE INJECTION
NOZZLE
ASSEMBLY
The injection nozzle assembly consists
of nozzle holder and nozzle. The nozzle
holder fixes the nozzle to the cylinder
head and at the same time it plays the
role of fuel passage to the nozzle.
The nozzle consists
of
the nozzle body
and needle valve.
When the fuel pressure reaches up to the
valve opening pressure, the needle valve
is
raised up and the fuel
is
injected
through the small holes at the
tip
of the
nozzle body.
.The valve opening pressure is adjustable
by changing the adjusting washers.
IDENTIFICATION
MARK
ADJUSTING WASHER
NOZZLE
SPRING
FIG.
69
NOZZLE
BODY
VALVE CLOSED VALVE OPENED
FIG.
70
-
44
-
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