Wartsila RT-flex50-D User Manual

Maintenance4103−1/A1 RT-flex50-D
Wärtsilä Switzerland Ltd
2/ 2
3.3 Measuring tooth backlash with lead wire
D Use a fresh piece of lead wire Pb 99.9 fine
of
1.5 mm diameter for each measurement.
D Always use lead wires of the same diamet
er
and quality.
⇒ Place lead wire pieces a, b, c of about 200 m
m
length around the tooth profile and attac
h
them with scotch tape (see Fig. ’A’ and ’B’)
.
⇒ Number the tooth profiles in accordance wi
th
Fig. ’B’.
⇒ Turn the lead wires only once through th
e
teeth meshing.
D Lead wire ’c’ (Fig. ’A’) serves to verify tot
al
tooth backlash ’f’ (Fig. ’C’).
With lead wires ’a’ and ’b’ (Fig. ’A’) the too
th
profile parallelity is checked.
D Total tooth backlash ’f’ (Fig. ’C’) composes
of
f
1
and f
2
(thickness of lead wire):
f = f
1
+ f
2
D Obliquity ’Df’ is calculated from the differenc
e
in thickness of the squashed lead wires alon
g
driving flanks TF (Fig. ’A’):
Df = a
1
− b
1
or a
3
− b
3
etc.
D The admissible deviation of tooth profile p
a-
rallelity amounts to max. 0.2
o
/
oo
across th
e
width of the tooth.
4. Checking the running performance
To enable judging the running performance
of
the gear train after recommissioning, thre
e
teeth each of the gear wheels are smeare
d
with a thin coat of oil resisting marking blu
e
(ink) equally spread. This check is necessa
ry
in order to verify the mating appearance of th
e
teeth.
One brand of oil resisting marking blue is, f
or
example, Dykem Layout Red Dx-296.
LEAD WIRE Ø 1,5 mm
a
1
a
3
7
a
c
b
0
1
2
3
4
5
6
...
...
...
TF
c
A
B
C
15 mm
15 mm
=
=
b
1
b
3
f
1
f
2
000.653/93
000.653/93
000.653/93
Checking the Running and Backlash Clearances and Condition of Teeth
2010

Wartsila RT-flex50-D Specifications

General

Brand	Wartsila
Model	RT-flex50-D
Category	Engine
Language	English