Self-Study Programme 21 Automatic gearbox 01M.pdf

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EVERY SECOND ONE IN THE
WORLD DRIVES AUTOMATIC!
SP21-30
The automatic gearbox 01M in the OCTAVIA embodies matured engineering in the au-
tomatic-shift gearbox.
The automatic gearbox offers the choice between the different shift programmes - de-
pending on the driver's accelerator pedal movements and the driving situation. If the
driver adopts a moderate style of driving, the gearbox switches to "Economy", and if
the driver's movements of the accelerator are sharper, it selects "Sport".
When climbing or descending hills the shift points are automatically selected as a func-
tion of the position of the accelerator pedal and the speed of the vehicle.
Thanks to a sophisticated electric-hydraulic control the automatic gearbox combines
performance, economy and driving comfort to offer a convincing automatic driving sen-
sation.
Comprehensive self-diagnosis monitors the electrical/electronic control and ensures
that any irregularities which occur are rapidly detected.
The Self Study Programme is intended to help you acquire the appropriate knowledge
regarding components, design and operation of the automatic gearbox.
2
Contents
Introduction
The automatic gearbox 01M
Selector lever positions
Mechanical Components
Planetary gear system
Planet gear set
Final drive/Differential
ATF Circuit
ATF circuit (block diagram)
Oil pump (ATF pump)
Torque Converter
The hydrodynamic torque converter
Torque Converter Lock-up Clutch
Torque converter lock-up clutch
Flow of hydraulic power
Flow of mechanical power
Operating principle of the lock-up clutch
Shift Elements
Multi-disc clutches
Multi-disc brake
Freewheel
Power Flow
Overview of System
Sensors
Actuators
Subsystems
Selector lever lock
Park lock
Emergency Programme/Emergency Running
Self-Diagnosis
Function Diagram
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Service
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OCTAVIA
Service Service
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OCTAVIA
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OCTAVIA
Service Service
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You can find information on inspection and
maintenance, setting and repair instructions in
the Workshop Manual.
3
Introduction
The automatic gearbox 01M
Oil cooler
(ATF cooler)
Oil pump
(ATF pump)
Planetary gear
Intermediate
gear stage
Torque converter with lock-up
clutch
Flange shaft
Differential
SP21-5
4
The automatic gearbox 01M has been developed for models with a power range from 55 up to
128 kW.
The gearbox is also transversely mounted relative to the direction of travel to match the instal-
lation position of the engine in the OCTAVIA.
The mechanical components of the automatic gearbox operate on the principle of the planetary
gear system.
The gearbox features a hydraulic-electronic control.
The hydraulic shift control unit is positioned below the gearbox in the oil sump.
The electronic control unit (ECU) is installed in the vehicle (in the plenum chamber).
It processes input information and selects a matching shift programme in line with the style of
driving.
The gears are then shifted automatically.
The gearbox and torque converter are matched in their overall ratio to the particular power out-
put of the engine.
The power from the engine is passed by a hydrodynamic torque converter with integrated lock-
up clutch into the gearbox.
The 4 forward gears and reverse gear are formed by means of a Ravigneaux planetary gear
system.
The power is passed on to the differential and to the flange shafts through an intermediate
gear stage.
Tripod constant velocity joint shafts link the gearbox to the final drive.
A separate cooler is located directly on the gearbox for cooling the automatic transmission fluid
(ATF).
The ATF cooler is integrated in the coolant circuit of the vehicle.
5
Introduction
Depending on the ratio required, sun wheels
or the planet carrier in the Ravigneaux planet
gear set are held fixed or driven and the 4 for-
ward gears and reverse gear formed in this
way.
The shift elements required for this are the
clutches K1
to
K3,
the
brakes B1
and
B2
and
the freewheel F.
F
B1
K3
K1
K2
B2
Ravigneaux planetary gear system
K
SP21-12
Hydraulic shift control unit
(control valve housing)
6

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