Fuel Injection Nozzle Holder - Robin America DY30 Service Manual

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 M A R K
T h s consists of the nozzle holder and nozzle. The nozzle
\
FUEL I N L E T
/
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
V A L V E CLOSED
V A L V E OPENED
/-
Fig. 62
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33
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