ICF vs LHB bogie:
Requirements from a Bogie:
- Linear/Curving requirement.
- Energy transmission and control
- Linear,vertical,lateral, longitudinal.
- Roll prevention requirement.
- Ability to filter out the irregularity between track and bogie.
- The concept of offloading.
- Ability to bear the static load.
The function of Axle Guides (ICF):
- Guides the axle w.r.t. bogie frame laterally as well as longitudinally.
- Transmits tractive & braking force between bogie frame & axle box.
- In ICF, acts as a single acting hydraulic vertical shock absorber for primary spring.
- In FIAT bogie, provides control flexibility between frame and axle
Axle Box Bearing:
- Spherical type roller bearing with the self-align feature.
- Automatically adjust to the deviation in the centerline of the axle during the run.
Main Feature of FIAT Bogie:
- An adoption of EUROFIMA design
- manufactured by FIAT/SIG Switzerland.
- Maximum operating speed is 160 kmph
- Up to 200 kmph with minor modification.
- Permanent earthing connection
- vTo safeguards axle bearings.
- Excellent ride index, superior ride quality
Primary Suspension (FIAT Bogie):
- Nested steel coil springs.
- Control arm axle guidance.
- Lateral flexibility-reduced wheel root wear.
- Bump stop (rubber spring) over steel spring.
- Hydraulic dampers.
- Secondary Suspension (FIAT Bogie):
- Nested flex-coil steel spring.
- Minor pads
- Helps the two bogies to align equally.
- Rubber spring
- Inside coil springs for progressive characteristic