porting type. All the surface
of
shaft nck is quenched or nitrided,
to
improve
the
wearing resistance. For 6 - cylinder high - speed strengthen diesel engine,
the
crank-
shaft
;s
made
of
No.
45 steel material,
the
main shaft neck and connecting rod shaft
neckare treatedby induction quench.
The front and rear end are sealed by skeleton structure rubber oil seal. There are
two
connecting methods
of
the crankshaft front
end,
one is multiple keys
for
full
output,
another one is flat key. When output
power
is needed at the front
end,
Multiple keys
and casting pulley should be adopted.
Otherwise,
flat key and rotary pulley should be
used instead.
In
order
to
decrease the torsion stress
of
crankshaft and
the
noisy
of
engine,rubber shrunk - in torque insulator element can be used
if
necessary.
Flywheel is positioned by cylindrical
pin,
and fastened on the rear end
of
crankshaft by seven high strength
bolts. Flywheel bolts should be tight-
ened gradually according
to
the
se-
quence shown
in
Fig. 4 Flywheel bolts
are self - locked
by flywheel bolt gas-
kets. The gaskets are made
of
15
#
steel treated by cementation process.
Fig.4 The tighten sequence
of
flywheel bolts
The outside
of
flywheel is marked
TDC
point,and also the scale range
of
0 -
300C
of
advanced used
to
adjust advanced angle
of
supplying fuel. Each scale means 1
0
crankshaft angle
of
turn. For some models
of
engines, the
TDC
point is marked at
the flywheel end face
of
crankshaft pulley
..
6.
Transmission system
the diesel engine transmission system is includino
to
nnrm~1
\/
-
bQlt
tr~nGrniooion
and
the
g~ar
transmission inside gear case.
Show~l-
in Fig. 5.
• 32 ·
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