Valmet 611 - Timing gear assembly types and idler gear description

The flmlng gear
assembly
comprlsos
hel
lcal
gears
rhlch
have b€en nachlned
and tempered
!rlih
preclslon.
The
gears
are
locatod ln +he
gear
houslng flxed
to +he
cyllnder block
front
face.
The camshaf+,
lnjec+lon
pump
and ol
I
pump
as
yell
as
+he
compressor ol
611/612
englnes
are drlven +hrough
the flmlng
gears.
The gear
houslng
can
alio encompass
-a
drlve
unll for,
say,
hydraullc
pump.
There
are
three maln
+ypes
of +lmlng
gsar
assembl
les:
l. 1
The +lmlng
gear
assenbly
equlpped
v,lih an ldler
goar
},lth
bevel
led ball bearlng
ls moun+gd
on
6l
I
englnes.
Thls gear
assembly
has noun+lng
polnts
ready
for a
drlve unl+ and
a l-cyllnder
o' 2-cyllnder,
gear-drl
ven clnpressor
can be
npunl'ed
on ihe
englne
lef+ slde.
l. Camshaf+
gear
2.
ldler
gear
5. Injec+
lon
pump
gear
4.
Crankshaf+
gear
5. 0l
I
punp gear
The tlmlng
gear
assembly
equlpped
gear
'.{lth
plaln
bearlng
Is used
4ll
and
some 611 englnes. Thls
assembly can
be furnlshod wlth
drlven
by ihe
camshaft
gear.
The 6ll englnes have
a slmllar
verslon of
assembly,
equlpped t|lth a longer
ldlor
shafi,
ho{over.
l. Camshaft geör
2. ld
ler
gear
f. Injec+lon
pufip
gear
4. Hydrau
I lc
pump gear
5.
Crankshafi gears
6. 0i I
pump
gear
7,
ldler
gear
of compressor
8. Compressor-
goar
The 6l I
and 612
englnes
have
a
tlmlng
gear
assembly where
the gear-drlven
conpressor
ls
locöfed
on the
englne
rlght
slde.
The ldler
gear
has bevelled
ball
bearlng.
I DLER GEAR
The
ldlor gear
ls
connecied io
a shaft llxed
to
fhe
cyllnder
block
front
face by means of
a
bearlng rhlch
ls elther
a
plaln
bearlng or
a
bevelled
ball
b€arlng
1611/612r.
Mounilng
par+s
of ldler gear
l{lih plaln
bear
Ing.
Screr.
2,
Screr J.
Retalnlng flange
Boarlng
bush
5.
cear
6. Shåfi
{ l+h
an
ln
f09,
llmlng
a dr lve
ld ler
111
gear
unlt
gear
g9aa
l.
Drlve
unl+
gear
(shaft)
2.
Camshaft
gear
i.
ld ler goar
4.
Compressor/
I
nJ
ect I
on
pump goar
5.
Crankshaft
qeårs
6.
ol
I
pump geär
5-4
l.