Motor and Trailer Bogies for Heavy Metro Vehicles - Siemens

SF 4000 TDG
Motor Bogie for Diesel Multiple Units (DMUs)
The SF 4000 TDG is a motor bogie which
was developed according to the
requirements of modern Multiple Units
and is in operation at a service speed of
up to 120 km/h and a maximum axle
load of 15 t.
The bogie consists of two axles with a
two-stage suspension system and an air
spring as secondary suspension. The
motor bogies are driven by a cardan
shaft on both axles and are combined
with Jacobs-type trailer bogies.
Therefore multiple units for express rail
like the Siemens DESIRO family can be
equipped complete with these bogies.
Improved and optimised components of
service proven bogies have enabled a
high performance bogie family to be
created. This bogie family ensures high
reliability, easy maintenance, low service
costs, high flexibility and excellent riding
comfort.
A typical application of the SF 4000 is
for the train LVT 642 of the Deutsche
Bahn AG.
The SF 4000 TDG with a wheelbase of
1900 mm is used as a motor bogie in
express- and commuter-trains of up to
120 km/h in combination with the
Jacobs- type trailer bogie SF 4000 JLDG.
Primary suspension comprises laminated
conical sleeve springs of metal-rubber
design with good self-damping
characteristic, ensuring longitudinally
and laterally flexible axle guidance.
Secondary transmission of longitudinal
forces is achieved by a traction rod. The
air springs in the secondary suspension
system ensure high passenger ride
quality. The levelling control valve
ensures that the same floor height can
be maintained under varying load
conditions. Transmission of tractionmotor
torque is achieved by cardan shaft
on both axles of the bogie.
The modern braking system comprises
disc brakes and optional magnetic track
brakes, ensuring very short braking
distance.
The carbody is supported on the
secondary suspension by a bolster,
which also serves as an additional air
reservoir. This bolster is completely
integrated into the bogie so that the
bogie can be easily dismounted. This
ensures the operator that the bogie
contributes to the minimisation of the
maintenance cost.
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