Motor and Trailer Bogies for Heavy Metro Vehicles - Siemens

SF 300
Trailer Bogie for Passenger Coaches
The trailer bogie SF 300 has been
developed, for passenger coaches for
speeds for up to 200 km/h and 16 t axle
load. For this purpose, the SF 300 is
used as standard-bogie by the Austrian
Federal Railways since 1989. Various
other railway authorities have also
placed orders for the supply of this bogie
type.
The bogie is extremely track-friendly
even at high vehicle speed. Within the
scope of the ERRI (ORE) trials B 176
conducted in the early nineties, the
SF 300 bogie won an award for being
one of the three most innovative and
track-friendly trailer bogies in Europe.
Precise axle guidance is ensured by two
guide pins, pressed into the bogie frame
and by axle guide bushes. This
arrangement permits both high running
stability at high speeds and the radial
adjustment of the wheelsets when
negotiating curves.
Due to this innovative axle guidance, the
wheel -track forces are reduced and the
bogie becomes more trackfriendly. The
open H-frame of this bolster bogie is of
flexible design.
The carbody is supported by
slidingplates, mounted in a bolster
which is connected with the bogieframe
by the secondary suspension system.
The secondary suspension system
consists of four steel flexicoil springs for
each bogie.
The springs do, however, only transmit
longitudinal, transversal and vertical
movements, while rotational
movements are restrained due to a
torsion resistant bolster / bogieframe
connection.
Rotational movements of the bogie
around the pivot are damped with
respect to the carbody by the friction
plates mounted in the bolster.
The free lateral spring travel of ± 60 mm
is restricted by a curve-dependent
limitation of lateral play, thus ensuring
high ride quality and adherence to
vehicle gauge in accordance to UIC.
Depending on customer requirements
and running speed, two or three disc
brakes per wheelset and a magnetic
track brake are provided.
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