Motor and Trailer Bogies for Heavy Metro Vehicles - Siemens

SF 90 TDG and LDG
Bogies for High Floor LRV
The bogie SF 90 was designed for the
SD 160 LRV with a floor height of
1000 mm. Variations of this bogie family
are in use in Calgary, Denver, Salt Lake
City etc.
Two basic model variations can be
supplied in accordance with the
arrangement under the carbody.
Motor bogie - SF 90 TDG
Trailer bogie - SF 90 LDG
The motor bogies SF 90 have a bolster
beam and can be pivoted with the
carbody around the high axis via the ball
bearing slewing ring.
The bogie bolster beam is joined to the
bogie frame by means of two
longitudinal rods. The primary
suspension has rubber-metal chevron
springs with good self-damping
guaranteeing longitudinal and lateral
elastic axle guidance. The secondary
suspension has a steel coil spring.
Vertical and longitudinal vibrations are
hydraulically damped.
The motor bogies SF 90 are equipped
with completely suspended drives. The
gear unit and the wheelset axle are
connected via a hollow shaft and a
spider coupling.
The drive unit consists of a laterally
arranged, self-ventilated three phase
asynchronous motor and a low-noise
spur gear unit.
The vehicles have an electro-hydraulic
brake system. For the motor wheelset
the brakedisc is fixed to the hollow
shaft. The spring loaded brake unit is
mounted directly to the gearbox. For the
trailer bogie the brake disc is mounted
on the axle. The brake caliper is hung on
an additional transversal beam for that
application.
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