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PART 7-1
AUTOMATIC TRANSMISSION (Borg-Warner)
7-3
FIG. 3 - Torque Converter Operation
re-entering the impeller assists in
driving
it,
thus providing a torque
multiplication.
As the turbine speed increases, the
fluid ftow angle from the turbine
vanes changes, until at a speed
differential of approximately ninety
per cent of the impeller the stator is
driven in the same direction as the
turbine and the impeller.
The torque converter then adopts
the characteristics of a fluid flywheel
and there is no torque multiplication.
The torque converter fitted to the
Falcon has a nominal diameter of
11
in.
TRANSMISSION
The transmission consists of a
hydraulically controlled epicyclic gear
train with two multi-plate clutches,
two brake bands and a sprag type
one-way clutch. By applying the
clutches
and/
or brake bands auto-
matically in various combinations,
three forward gears and one reverse
are obtained. Hydraulic fluid is sup-
plied under pressure to a control
system and thence to the clutch
operating pistons and brake band
servos by an oil pump driven by the
engine. This pump supplies all the
hydraulic needs of the automatic
transmission and torque converter.
EPICYCLIC GEAR TRAIN
The gear train consists of two sun
gears, two sets of pinions mounted
on a pinion carrier and a ring gear. In
forward gears power enters through
the forward sun gear, in reverse
power enters through the reverse
sun
gear, power leaving the gear
set
in
each case by the ring gear. For for-
ward gears the double set of pinions
is used, but in reverse a single set is
used
so
causing the ring gear to
rotate in the opposite direction to the
sun gear. The various mechanical
ratios of the gear
set
are obtained
by the engagement of hydraulically
operated multi-disc clutches and
brake bands.
MULTIPLATE CLUTCHES
The two multiplate clutches are
FIG. 4 - Torque Converter Typical
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operated by hydraulic pistons to
connect the converter to the gear
set.
For first and second gears the front
clutch connects the converter to the
forward sun gear, and for reverse the
rear clutch connects the converter to
the reverse sun gear. Both clutches
are applied locking the epicyclic gear
train to give direct drive
(1
:
1) for
top gear.
The front clutch consists of three
externally and four internally toothed
plates. The rear clutch consists of
five pairs of internally and externally
toothed plates.
FRONT PUMP
DRIVE TANGS
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