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AUTOMATIC
FREE-WHEELING
HUB INDICATOR
SYSTEM
-
Generallnformation
8-211
3.
Automatic
free-wheeling
hub
in free
condition
For the free condition,
although
there
are (when
the vehicle
is traveling)
output
signals
from the vehicle-
speed
sensor,
there
are no signals
from
the pulse
generator,
with
the result
that the memory
circuit
is
erased
(because
reset signals
are output
from
the lock-discrimination
circuit),
and so the indicaotr
light
does
not
illuminate.
I
Lock
Use-detection
-discrimination
Memory
ipeed
sensor
Ignition
switch
Automatic
free-
detection
circuit
circuit
circuit
Automatic
free-wheeling
indicator
control
unit
-
hub
i
Sub fusible
link
link
Pulse
generator
cross-sectional
view
PULSE GENERATOR
Coil
hgnet
16W1547
rator
Front out-
put shaft
16W1546
The pulse generator
is located
at the rear part of the front
output shaft of the transfer,
and is composed
of the magnet,
the coil and the pole (iron core).
When a magnetic
material (iron, nickel, etc.) is brought
close
to and moved away from the pole (iron core), the magnetic flux
within
the pole changes,
thus generating
AC voltage
in the
coil.
Because
the front
output
shaft
does not rotate when
the
automatic
free-wheeling
hub is in the free condition,
there is
no generation
of AC voltage
in the pulse generator.
In the locked condition,
however,
the front output shaft and
the pulse rotor rotate, with the result that the magnetic
flux
(within the p o e I (' Iron core) of the pulse generator)
changes in
accordance
with
the rotations
of the pulse rotor, thereby
generating
AC voltage
in the coil.
This AC voltage is transmitted
to the automatic
free-wheeling
hub indicator
control
unit.
STB Revision
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