Motor and Trailer Bogies for Heavy Metro Vehicles - Siemens

SF 4000 JLDG
Jakobs-Type Trailer Bogie for Diesel Multiple Units (DMUs)
The SF 4000 JLDG is a trailer bogie
which was developed according to the
requirements of modern Multiple Units.
It has a service speed of up to 120 km/h
and a maximum axle load of 16 t.
The SF 4000 bogie family comprises
motor and Jakobs-trailer bogies. The
bogie consists of two axles with a twostage
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 Jakobs-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 allowed 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 JLDG with a wheelbase of
2650 mm is used as a trailer bogie in
express- and commuter-trains up to
120 km/h in combination with the motor
bogie SF 4000 TDG.
Primary suspension comprises laminated
conical sleeve springs of metalrubber
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.
The two halves of the carbodies are
supported on the longitudinal beam of
the bogie by means of two air springs
per carbody. The modern braking system
comprises wheel disc brakes, which are
easy to maintain. The bogie is equipped
with auxiliary air reservoirs. The car
body is supported on the secondary
suspension on these additional air
reservoirs.
These auxiliary air reservoirs are
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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