Oil Pump; Epicyclic Gear Sets; Control Components - Fiat Bravo Service Manual

Bravo-Brava
Copyright Fiat Auto
ft
Auto t r a n s m i s s i o n and differential
16v
Components and operation
1. Flywheel attachments
2. Casing connected to pump
3. Lock-up clutch
4. Turbine
5. Pump
6. Stator
7. Motion input shaft
OIL P U M P
The oil pump used for the AISIN automatic
transmission is of the inner gear type.
It is located between the torque converter and
gearbox casing, and is driven directly by the
converter pump impeller.
The functions of the oil pump are as follows:
- to provide the necessary pressure to the
hydraulic control system and the gearbox
control components (clutches and brakes);
- to send an oil f l o w into the torque convert-
er case in order to cool it and to be able to
operate the lock-up clutch;
- to lubricate the moving components of the
gearbox;
- to circulate oil in the cooling system.
Structure of the oil pump
1. Inlet side
2. Delivery side
E P I C Y C L I C G E A R S
The AISIN automatic transmission uses t w o
epicyclic gear sets for obtaining the five trans-
mission ratios (4 forward gears + reverse gear).
The rear gear set P1 is a simple epicyclic
gear set comprising a sun gear ST, four
planet gears ST1 and a crownwheel K 1 .
The front gear set P2 consists of an
epicyclic gear set comprising a sun gear
S2, four inner planet gears ST2, four outer
planet gears ST3 and a crownwheel K2.
The shafts of the planet gears S T 1 , ST2
and ST3 are attached to the gear train
carrier T 1 .
Epicyclic gear sets P1 and P2
K1. Crownwheel of P1
K2. Crownwheel of P2
5 1 . Sun gear of P1
52. Sun gear of P2
ST1. Planet gears of P1
ST2. Inner planet gears of P2
ST3. Outer planet gears of P2
T 1 . Gear train carrier
21-27.
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