Motor and Trailer Bogies for Heavy Metro Vehicles - Siemens

SF 30 C LFW
Trailer Bogie for Low Floor Tram Car
The bogie SF 30 C LFW is in service for
the low floor tram Combino and has
been in production since 1998.
It allows for a floor height of 350 mm
above TOR throughout the whole length
of the car. The bogie family SF 30 C was
developed in 1995 and allows for a high
degree of modularity as well as the car
design itself. The running gears are
available for standard and meter gauge.
With regards to its vertical axis, the
bogie has a torsion-resistant connection
to the carbody by means of two
longitudinal rods. This ensures optimum
aisle width between the wheel guards.
The primary suspension is a conical
rubber-metal-spring with good
selfdamping characteristics that
guarantees elastic wheelset guidance in
longitudinal and lateral direction.
The lateral secondary suspension is a
coil spring combined with an additional
rubber spring that effects a progressive
spring characteristic.
The damping of vertical and lateral
oscillations is realized by the use of
hydraulic dampers.
The axle beam for the stub axle is a cast
or forged design. Rubber suspended
wheels are mounted on this axle beam
in combination with tapered roller
bearings. The wheel diameter is 600 mm
new and 520 mm worn.
The stub axle has one ground brush for
the basic variant. Optionally two ground
brushes per axle can be mounted.
Each running gear is equipped with 4
brake discs and 4 active brake calipers as
service brake. Optionally a magnetic
track brake can be mounted.
The bogie frame is a H-shaped
combination of plates, cast and forged
parts.
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