Hydraulic Control System; Free Wheels - Fiat Bravo Service Manual

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Table of Contents

Auto transmission and differential

Components and operation

The roller clutch FO connects the clutch carrier drum D and crownwheel K1 of the gear set P1 w h e n the

clutch C1 is active, and the motion comes from the gearbox input shaft.

The roller clutch F1 prevents the anti-clockwise rotation of the crownwheel K2 of the gear set P2.

H Y D R A U L I C CONTROL S Y S T E M

The operation of the automatic transmission is made possible by the operation of the clutches and

brakes, via hydraulic actuators driven by valves w h i c h move in accordance w i t h the commands issued

by the control module. The feed is provided by a gear pump, driven directly by the engine through the

torque converter.

A cooling radiator and fan controlled by a thermal switch keeps the oil temperature within pre-estab-

lished limits.

The free wheels consist of t w o c o n -

centric races and a cage enclosing a

set of asymmetrical pawls, w h i c h

permit the relative rotation of the t w o

races in a particular direction ( A ) ,

while in the opposite direction the

pawls jam, preventing relative rota-

tion and providing a reaction torque.

Publication no. 506.670/06