Fiat 1996 Brava Service Manual page 488

Bravo-Brava \^
16v
Auto transmission and differential
Components and operation
21-27.
First gear (selector lever on position D-3-2)
With the selector lever on one of the three positions, the gearbox functions in the same way and with the
same transmission ratio as with the selector lever at position 1, with the only difference that the crown­
wheel K2 of the front gear set P2 is not locked by the brake B2.
As the torque which acts on the crownwheel K2 is much higher than that acting on the gear train carrier
T 1 , the crownwheel would rotate in an anti-clockwise direction, but the free wheel F1 prevents this ro­
tation, permitting transmission of motion to the gear train carrier and so to the differential relay shaft U,
as in the previous case.
However, in this case there is no
engine braking effect, as the
crownwheel K2 can rotate freely in
a clockwise direction, allowing the
gear train carrier T1 to rotate at a
higher speed than that imposed by
the transmission ratio.
Second gear (selector lever on position D-3-2-1*)
* selected manually (recovery)
The gearbox input shaft E rotates in a clockwise direction.
The crownwheel K1 is coupled to the input shaft E by the engagement of the multiple disc clutch C 1 ,
clutch carrier drum D and clutch C3 (already engaged with I M or P selected).
The clutch C3 locks the free wheel FO.
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The sun gear S1 is locked to the
gearbox casing by the engagement
of the band brake B 1 .
The planet gears ST1, driven by
the crownwheel K1 of the
epicyclic gear set P I , rotate in a
clockwise direction, shifting onto
the locked sun gear S I ; they then
transmit motion in a clockwise di­
rection to the gear train carrier T1
and the gear 11 coupled to it.
The gear 11 transmits motion to the
wheels via the gear 12 and the dif­
ferential relay shaft.
P4A11AB02
Copyright Fiat Auto
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