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7-2
FUEL
INJECTION
NOZZLE
HOLDER
1.
Specifications
Part
Name
~ ~~
I
NOZZLE
HOLDER
I
Part No.
4 No.
of
nozzle
hole
C
Identification
mark
105
11840
00
(Diameter)
13.2
kg/cm2
Spring constant
195
kg/cm2
Valve opening pressure
(0.22
mm)
-
a
2.
Features
Both the injection nozzle and the injection pump are very important parts for producing fuel
fog
for combustion. There are
two types of injection nozzle, one is hole type and the other is pintle type. The injection nozzle for DY30 and DY35 Diesel
engine
is
developed as a result
of
joint research and development project by Diesel Kiki,
K. K.
and our company, and it is
direct combustion system, having the special hole type nozzle.
For producing better combustion gas, it utilizes
swirl
and
squish
flows
and for producing the most proper fuel fog, injection
pressure is raised
up
to
195
kg/cm2.
3.
Structure
of
the
ignition
nozzle holder
IDENTIFICATION
MARK
Ths consists
of
the nozzle holder and nozzle. The nozzle
\
FUEL
INLET
/
holder fixes the nozzle to the cytinderhead and at the same
time it plays the role
of
fuel passage
to
the nozzle. (The
valve opening pressure
of
nozzle is adjustable. However, the
nozzle for DY30 and DY35 engines includes spacer
in
it and
it is unadjustable.)
The nozzle consists
of
the nozzle body and needle valve;
and when the pressure reaches the limit to open the valve,
nozzle
for
this diesel engine includes spacer
in
it and it is
unadjustable.)
4.
Function
of
nozzle
Through the injection pump, fuel is delivered forcibly into
the nozzle body and it raise
up
the needle valve and is at-
omized in the combustion chamber through the holes of
the nozzle body. In case
of
the hole type nozzle, the size of
the opening
of
the holes does not alter. (See
Fig.
62.)
TlNG WASHER
NOZZLE SPRING
NOZZLE
BODY
Fig.
61
VALVE
CLOSED
VALVE OPENED
/-
Fig.
62
-
33
-