Fiat Bravo Service Manual page 487

Auto transmission and differential
Components and operation
21-27.
Neutral (selector lever on position N)
The gearbox input shaft E rotates in a clockwise direction.
The clutch C 3 couples the crownwheel K1 to the clutch carrier drum D, to permit the transmission of
motion w i t h o u t delays or stresses, caused by the simultaneous engagement of several clutches and
brakes, w h e n the selector lever is positioned on R or D (1st gear).
The multiple disc clutches C1 - CO - C 2 and brakes B 2 - B1 are disengaged, so the epicyclic gear sets
P1 and P 2 do not receive motion, thus isolating the differential relay shaft U from the gearbox input
shaft E.
NOTE The parking lock is off, so the planet gears ST1 - S T 2 - S T 3 are free to rotate around the sun
gears S1 and S 2 , allowing the vehicle to move if it is on a slope.
NOTE Engaging the brake B1 in 1st and reverse allows the engine to brake the vehicle in deceleration.
10
Bravo-Brava
Park (selector lever on position P)
zzzy
The control components are as de-
scribed for position N, w i t h the
sole difference that the parking
lock (ratchet P) is engaged, pre-
venting the vehicle from moving.
F i r s t gear (selector lever on posi-
D
tion 1)
*6
The gearbox input shaft E rotates
in a clockwise direction.
The crownwheel K1 is coupled to
the input shaft E by the engage-
ment of the multiple disc clutch
C I , the clutch carrier drum D and
the clutch C 3 (already engaged
with N or P selected).
The clutch C 3 locks the free wheel
FO. The crownwheel K 2 is locked
to the gearbox casing by the en-
gagement
brake B 2 . The brake B 2 locks the
free wheel F 1 . The planet gears
S T 1 , driven by the crownwheel
zzzy
K1 of the epicyclic gear set P I , ro-
tate in a clockwise direction and
via the sun gears S1 and S 2
transmit motion, reduced and in a
clockwise direction, to the planet
gears S T 2 of the epicyclical gear
set P2.
The planet gears S T 3 , driven by
D the planet gears S T 2 , rotate in an
anti-clockwise direction and, by
the reaction on the locked c r o w n -
wheel K2, shift and rotate in clock-
wise direction the gear train carrier
T I and gear I I .
The gear 11 transmits motion to the
wheels via the gear 12 and the dif-
ferential relay shaft U.
@ u
6 l
of the multiple disc
Publication no. 506.670/06