Voith DIWA Transmissions

Voith Turbo
Voith DIWA®. 3 E automatic transmissions
in Mercedes-Benz buses
Automatic neutral switch ANS when vehicle is at a halt
Oil change intervals every 120,000 km, partly synthetic oils may be used (original filling ex works).
AUTOMATIC
Voith DIWA Transmissions –
Quality engineering
Engine output
Voith DIWA transmission
Hydraulic
part
Gear shifting
1-2
Mechanical
part
0
Start-up range
(DIWA range)
Competitive transmission
Engine output
Shifting into
1st gear
hydr./mech.
1st gear
hydr.
Shifting into
2nd gear
hydr./mech.
The DIWA principle has proven itself
but stays young:
The long DIWA driving range – where
others have to shift gears (up to 50%
more frequently), the DIWA transmission holds its own.
This is comfortable and safer for standing passengers; it also means less
wear on clutch plates and hence longer
service life.
Driving and braking with one circuit –
and therefore fast response and precise adjustment of the retardation
effect. The latter is achieved by controlled converter drainage.
1st gear 2nd gear
mech. hydr./mech.
Start-up range
(Torque converter transmission)
1st gear
(DIWA range)
Traction
2nd gear
3rd gear
4th gear
Driving:
Power split with differential converter.
Driving Speed
0
Driving Speed
Braking power
Braking:
Retarder function with the converter.
0
The transmissions and gear-shifting
programmes are adapted to the
environmentally friendly low-emission
EURO 3 engines.
An electronic-hydraulic control system
improves the gear-shifting quality of the
transmission in such a way that
changes from one gear to the next are
virtually imperceptible.
As far as CAN is concerned, Voith
Turbo is the first manufacturer of transmissions worldwide who has been
utilising this technology for years in
series-manufactured control systems.
An acceleration-dependent gear-shifting programme measures the acceleration and the load conditions of the bus
and automatically selects the most economical gear-shifting points. One gearshifting programme is sufficient for all
operating conditions. The unique PC
diagnosis system controls and records
the transmission functions whether the
bus is driving or stopping. This includes
the facility of monitoring the main operation data.
0
Voith principle:
Driving and braking
in one circuit
DIWA transmissions are continuously adapted to the latest technical
developments in the commercial
vehicle sector.
Braking stage l
ll
lll
Other advantages are the integration of
the filter in the transmission housing,
the smaller stainless steel heat
exchanger in design for longer service
life, the further development of the torsional vibration damper for lower
engine speeds, in order to reduce fuel
consumption, as well as the automatic
ANS neutral stage which separates
engine and transmission completely
when the vehicle is at a halt. Maintenance intervals are now every 60,000
kilometres, or – if partly or fully synthetic oils are used – every 120,000
kilometres.
Design and mode of operation
of DIWA transmissions
1
2
3
4
5
6
Push-button switch
Pedal brake valve
Accelerator
Electronic control unit
Level converter
Diagnosis via PC
6
1
2
3
5
A hydraulic torsional vibration damper
at the transmission input side effectively absorbs engine vibrations. Gear
changes are carried out electrohydraulically with patented solenoid
valves; the gear-shifting commands are
given by the digital control system. The
heat exchanger of Voith automatic
transmissions is integrated in the cooling circuit of the engine.
IES-CAN, FR
Illustration:
Four-speed DIWA-transmission
1 Counter-rotating torque
converter
2 Impeller brake
3 Lock-up clutch
4 Differential gear
5 Input clutch
6 Epicyclic gear set
7 Epicyclic gear set for reverse
gear and retarder
8 Torsional vibration damper
9 Heat exchanger
10 4th gear clutch (only D 854.3 E/D 864.3E)
8
5
4
3
10
2
1
The heart of the transmission is the
hydrodynamic converter, acting as a
counter-rotating torque converter. Situated in front of it are the pump brake, the
lock-up clutch, the differential gearbox
for power-splitting, the input clutch and,
with DIWA four speed transmissions,
the clutch for the fourth gear which is
designed as overdrive. Behind the converter, an epicyclical gear combines the
hydrodynamic and the mechanical powers. The final epicyclical gear set (7) is
for reversing and activating the retarder
during braking.
4
The control concept:
Micro-processor control
6
7
9
Digital processing of electric engine
signals such as EDC, electronic
throttle control etc.
The adaptive control system
ensures automatic adjustment to
engine and vehicle and is therefore a prerequisite for continuously
high gear-shifting quality throughout
the entire service life of the unit.
Easy data exchange allows
adaptation to new conditions
(engine, vehicle, driving conditions).
CAN-compatible
PC-based diagnosis system
DIWAgnosis enables accurate
diagnosis of transmission condition
and efficient failure search
Compatible with Mercedes-Benz
STAR diagnosis system.
Operating data storage allows
collection of key vehicle data.
Automatic transmissions for
Mercedes-Benz Citaro buses
Criteria for four-stage transmissions
Speed v [km/h] at nominal engine speed related to current MB axle series iA
Engine
OM 906 hLA
[kW]
iA
v [km/h]
180/205
180/205
180/205
180/205
5,27
5,77
6,21
7,38
119
108
101
85
205
205
205
5,77
6,21
7,38
108
101
85
CITARO L
205
205
5,77
6,21
108
101
CITARO G
205
180/205
180/205
180/205
5,27
5,77
6,21
7,37
119
108
101
85
CITARO
205
205
205
5,77
6,21
7,37
108
101
85
CITARO L
205
205
5,77
6,21
108
101
CITARO G
CITARO
City/Suburbs
Stadt/Regional
Engine
OM 457 hLA
[kW]
iA
v [km/h]
185/220/260
185/220/260
185/220/260
185/220/260
4,72
5,27
5,77
6,21
101
91
83
77
185/220/260
185/220/260
185/220/260
185/220/260
185/220/260
4,72
5,27
5,77
6,21
7,38
101
91
83
77
65
185/220/260
185/220/260
185/220/260
185/220/260
4,72
5,27
5,77
6,21
101
91
83
77
185/220/260
185/220/260
185/220/260
185/220/260
4,72
5,27
5,77
6,21
101
91
83
77
CITARO
220/260
185/220/260
185/220/260
185/220/260
5,27
5,77
6,21
7,38
91
83
77
65
CITARO L
220/260
185/220/260
185/220/260
5,27
5,77
6,21
91
83
77
CITARO G
preferably
city buses
CITARO
CITARO L
CITARO G
City/Suburbs
4
Automatic transmissions for
Mercedes-Benz Citaro Ü regional buses
Criteria for four-stage transmissions
Speed v [km/h] at nominal engine speed related to current MB axle series iA
Engine
OM 457 hLA
[kW]
v [km/h]
iA
Engine
OM 906 hLA
[kW]
CITARO Ü
119
108
101
5,27
5,77
6,21
205
205
205
101
CITARO LÜ
108
101
5,77
6,21
205
205
101
91
CITARO GÜ
108
101
5,77
6,21
205
205
iA
v [km/h]
185/220/260
185/220/260
4,37
4,72
109
101
185/220/260
4,72
185/220/260
4,72
5,27
Regional
Regional
Automatic transmissions for
Mercedes-Benz Integro regional buses
Criteria for four-stage transmissions
Speed v [km/h] at nominal engine speed related to current MB axle series iA
Engine
OM 457 hLA
[kW]
iA
v [km/h]
185/220/260
185/220/260
185/220/260
4,30
5,22
5,88
121
99
88
Regional
5
INTEGRO, INTEGRO L
Voith DIWA®. 3 E
automatic transmissions
in Mercedes-Benz buses
Voith Turbo GmbH & Co. KG
Product Group
“Commercial Vehicle Transmissions”
P. O. Box 2030
D-89510 Heidenheim/Germany
Phone 0049 (73 21) 37-82 49
Fax
0049 (73 21) 37-75 04
E-mail: DIWA-Getriebe@voith.com
www.voithturbo.com
Voith automatic transmissions can be
easily installed in all Mercedes-Benz
buses. Transport operators appreciate
the reliability, the consistent gearshifting comfort and the optimum
adjustment to environmentally friendly
low-emission engines. To date, over
100,000 DIWA transmissions have
been delivered.
3
1
7
8
4
9
1
2
3
4
5
6
7
8
9
O 405, Köln Transport
Citaro, Duisburg Transport
Citaro, Solingen Transport
Citaro, Aschaffenburg Transport
Citaro, Wiesbaden Transport
Citaro, Rheinbahn Transport
Citaro, Kiel Transport
Citaro, Graz Transport
Citaro, London Transport
5
6
G 1690 e 3/03 1000 MSW/WA Printed in Germany.
Dimensions and illustrations non-committal, subject to change.
2