Self-Study Programme 29 Octavia 4x4.pdf

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NEW
SP29-06
With the OCTAVIA 4 x 4, SKODA is enlarging
its production range with a vehicle offering
the most modern permanent all-wheel drive
technology.
Classical all-wheel drive concepts - still found
today in a large number of off-road vehicles -
in many cases make use of a rigid connection
which is engaged by means of a handshift.
A new technical feature for permanent all-
wheel drive with an additional connection at
the rigid through-drive to the rear, operated
independently of the driver, was the viscous
coupling, as fitted for example to the VW
syncro.
This was in the position only to detect wheel
slip, but not the cause of it. To ensure reliable
braking in such cases, both axles had to be
decoupled by means of a freewheel. When
reversing, the axles were again connected by
means of a lock.
A significant advance in modern all-wheel
technology has been achieved with the
development of the Haldex coupling.
The Haldex coupling can be controlled.
A processor analyses additional information
during the control cycle. It is no longer the
wheel slip alone which is decisive for the
distribution of the tractive forces, but also the
dynamic state of the vehicle.
The processor accesses the ABS wheel speed
sensors and the engine management system
(accelerator pedal signal) through the CAN-
BUS.
These data provide the processor with the
information which is required regarding
vehicle speed, cornering, deceleration or
acceleration, and enables it to react optimally
to the particular situation.
Advantages of the Haldex coupling
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Permanent all-wheel drive with
electronically controlled multi-plate
coupling
Front-wheel drive characteristics
Rapid response (power transmission)
Instant decoupling of both axles
No stresses in the drive train when parking
and manoeuvring
No restrictions when towing vehicle with
front wheels raised
Can be fully combined with wheel slip
control systems such as ABS, EDL, TCS,
EBD and ESP
Possibility of simple test of brakes and
performance on roller dynamometer
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Contents
All-wheel Drive
Manual Gearbox
Rear Final Drive
Cardan Shaft
Modifications to 4x4 Vehicle
Rear axle
Fuel tank
Vehicle floor
Exhaust system
Haldex Coupling
System description
Mechanical components
Multi-plate coupling
Hydraulic System
System Overview
Sensors
Control Unit
Actuators
Self Diagnosis
Function Diagram
Driving Situations
Test Your Knowledge
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You will find notes on inspection and
maintenance, setting and repair instructions
in the Workshop Manual.
3
All-wheel Drive
The 4x4 drive train
The 4x4 drive train is based on the
components of the A platform vehicles of the
Group.
A characteristic feature is the permanent all-
wheel drive with electronically controlled
multi-plate coupling - the Haldex coupling.
The new coupling is a compact unit which is
connected to the rear final drive.
Compared to front-wheel drive vehicles,
the 4x4 drive necessitated a number of
modifications or involved the introduction
of new assemblies.
The 5-speed manual gearbox is fitted
additionally with a bevel box.
The torque is transmitted from the front-wheel
drive to the rear-wheel drive by means of a
cardan shaft.
The cardan shaft is a two-section design. It is
attached at the manual gearbox by means of a
flexible joint, and at the rear final drive by
means of flexible joint with vibration damper.
SP29-64
5-speed manual gearbox with bevel box
4
SP29-07
The engine torque is transmitted through the
manual gearbox with the front axle differential
through the bevel box to the cardan shaft.
The cardan shaft is connected to the input
shaft of the Haldex coupling.
In the Haldex coupling, the input shaft is
separated by the output shaft to the bevel box.
The torque is transmitted on through the
differential of the rear final drive to the rear
drive shafts.
The torque is only transmitted to the rear final
drive if the multiple plates of the Haldex
coupling are closed.
SP29-09
Final drive with Haldex coupling and bevel drive
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Manual Gearbox
5-speed manual gearbox 02C
All-wheel drive
SP29-20
The 5-speed manual gearbox 02C is a gearbox
which has been specially developed for the
4x4 model.
The ratios of the individual gears and of the
final drive have been matched to the engine
output.
The clutch is operated hydraulically.
The bevel box is attached to the side of the
manual gearbox and connected to the
differential of the manual gearbox.
The differential and the bevel box are
mounted in the same housing in taper roller
bearings.
The bevel drive has to be set.
An important factor is the assignment of the
rear final drive to its bevel drive!
The ratio of the front bevel drive to the rear
bevel drive must always be 1.
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