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GROUP 38
INSTRUMENTS
DESCRI PTION
Fig. 3·89. Comb ined
instrument,
front side
VOLVO
'
103282
Instrumentation consists of a combined instrument,
s'
e e
Figs. 3-89 and 3-90, comprising speedometer, mi leo-
meter and trip meter, volt·age stabilizer f,ed tempera
-
ture gauge and fuel gauge, warning lamps and
'
r heo-
stat controlled instrument lighting. The temperature
gauge,
fu,
e l gauge, warning and instrument lighting
lamps, voltage stabilizer and rheostat f'or the instru-
ment lighting are mounted on a common
bas'
e plate,
see Figs.
3~91
and 3-92.
Fig. 3·90.
Combined
instrument, reverse side
VOLVO
104406
~Ö>U09
Fig. 3-91.
Mounting plate with instruments and warning lamps
SPEEDOMETER
The
spee,dome,
t e'r is of the eddy
current
type. In
the
speedome,
t er the.l'1e
,
i s a permanent magnet
whi'
c h
,
i s me-
chanically connected with aspeedometer cable driven
from a worm gear on the
gea1
rhox.
Surrounding
the
magnet is a drum, coil
spriong
and roller mounted on
a separate shaft. Rotation of the magnet generates
eddy currents which produce a turning torque on the
drum
.
T,he coil spring limits the degree of torque when
the speed of the magnet
increas'
e s. The effeot of
VOLVO
104408
Fig. 3-92.
Instrument base plate, reverse side, with warning
lamp and instrument lighting lamp
3:
37
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