FIAT BOGIE

FIAT BOGIE


 Design obtained from M/S Alstom￾LHB, Germany as part of LHB-TOT
contract.
 Adapted at RCF for various coach
variants.
 Fit to run up to 180 kmph.
 Superior ride quality
 Bump stops in primary and
secondary suspension.
 Miner pads in secondary suspension.
 Yaw, lateral and vertical dampers.
 Nested spring sets with 2 helical and
one rubber spring in secondary.
 Less wear and tear

BOGIE FRAME


 Solid welded frame –steel
sheets(ST-52) and forged, steel
cast parts to material GS20MN5V;
DIN 17182 (weld able).
 Two side frames connected by two
cross beams –support brake units.
Various brackets on frame.
 The bogie frame rests on the
primary suspension spring units
and supports the vehicle body by
means of a bolster beam. The
bolster beam is connected to the
bogie frame by secondary
suspension.

Primary suspension
 Two coil springs, one vertical damper, articulated control arm, elastic joints
connecting the axle bearing to the bogie frame.
 Better curve negotiation.
Wheel and Axles
 Two brake disks (4), diameter 640 mm and width 110 mm.
 Two wheel disc of tread dia 915 (New), 845 (worn).


Dimensions of wheel set:

Wheel diameter: New wheel dia 915mm, worn wheel dia 845mm
Wheel Re-profiling and balancing:
 Dynamic balancing 320rpm
 Less that/equal to 50gm.m
 Glue the needed weights.

 Axle bearings

 Taper roller
cartridge type
bearing
 Pre-assembled unit.
 Maintenance free￾overhaul 1.2 million
km.
 Sensors for
detecting speed


DISC BRAKE SYSTEM

 Axle mounted disc
brake
 Two discs per axle of
dia 640 mm
 Inbuilt slack adjuster in brake cylinders
 35mm brake pads

SECONDARY SUSPENSION

 Nest of flexi-coil springs inner and outer, rubber spring and secondary pad
 Vertical dampers
 Lateral dampers
 Yaw dampers
 Anti-roll bar
 Anchor Links


PRINCIPLES OF FORCE TRANSMISSION
 Vertical forces: Body-secondary springs-bogie frame-primary springs/ball joint
control arm-axles.
 Lateral forces: Body-Secondary Springs-Bogie Frame-Ball Joint Control Arm-Axles.
 Longitudinal traction efforts and braking powers: Body-Traction Centre-Traction
Rods-Traction Lever-Bogie Frame-Control Arm-Axles.
Curve Negotiation: An Articulated Control Arm (SGCI TO IS:1865) Is Connecting Axle Bearing
And Side Frame Through Elastic Connection, Which Will Provide Flexibility Between Axle And
Side Frame.
Fiat Bogie Frame Fabrication: Sequence of Operations.
 Stage-I: Fitting of top flange, bottom flange, web and 6 ribs
 Stage ii Fitting of control arm bracket, inside stiffener, brake head bracket, bkt for
vertical damper.
 Stage iii Robotic welding of above items.(mfr. M/S IGM ROBOTER system as Austria)
 Stage iv: Yaw damper assembly Bkt. & curve roll link Bkt. Tacking.
 Stage v: Full welding of bogie frame on manipulator
 Stage vi: Flame straightening of side frame.


SALIANT FEATURES:

Wheel Base 2560 mm
Diameter of wheels 915 mm(New), 845 mm(Condem)
Distance between the wheels 1600 mm
Brake disc diameter 640 mm
Bogie width 3030 mm
Bogie length 3534 mm
Bogie weight 6300 kg
Speed limit: Up to 160KMPH without any modification & up to 200KMPH with minor
modification
Riding index for Chair car: VERTICAL – 2.75 & LATERAL – 2.5