Cimmco wagon mfg and suspension system

It is one of the largest Wagon manufacturing unit of India situated at Bharatpur Rajasthan.

1. Cimmco had primarily been since 1957 in the business of Railway Wagons and Heavy Engineering Projects / Products at Bharatpur (Rajasthan) The Company is a Public Limited company in Private Sector having installed capacity for manufacturing of wagons, coaches, underframe 2240 Vehicular Units (VUs) and Industrial Machinery 14200 MT per annum and comes under a large Industrial Unit. The use of finished products like wagon is made for transportation of freight traffic by Indian Railways across India and close circuit transportation by some Industrial users like Thermal Power Projects. INTRODUCTION

2. The frame of ICF bogie is a fabricated stucture made up of mild steelchannels . Bogie component Bogiebolster Side bearer Swing link Axle box Centre pivot Bogie frame

3. Nested Secondary Spring Assembly Yaw Damper Cross Section Bogie Bolster Sec. Vertical Damper

4. Suspension is the set of elastic component,dampers and associated component which connect wheel sets to the car body. Suspension usually consist of two stages primary and secondary suspension. Primary suspension connecting the wheel sets to the bogie frame. Secondary suspension beyween the bogie frame and the bostler or car body Suspension system

5. Schematic diagram of a primary and seconary suspension system

6. Plate frame bogie primary suspension The bogie carries half the car weight which is then divided roughly equally between the two axles.  In the primary suspension design, the laminated axle box spring is fitted with two "spring hangers" attached to the outer ends of the longest spring plate.  The weight of the bogie on the axle box is transmitted through the steel laminated spring and the two spring hangers.  Each spring hanger and its associated spring carry 1/16th of the total car weight.   

7. The secondary suspension of the bogie is mounted crosswise (transversely) in the centre. It looks as shown below: Plate Frame Bogie Secondary Suspension The bogie has a pair of transverse members called “transoms”.  They are riveted or welded to the bogie side frames.  A steel "swing link" is hung from each end of each transom and a spring plank is laid across the bogie between them.

8. A side view of the bogie below shows the way the spring plank is supported by the swing links The spring plank rests on bearer rods suspended between the swing links.  This arrangement allows the spring plank to rock from side to side and it will act in opposition to sideways movement of the bogie frame. 

9. The spring plank, which carries springs, is shown in the below diagram . A pair of steel coil springs (shown in red) rest on each end of the spring plank.    On top of them sits the bogie bolster.  The bolster carries the vehicle body.  The body is located by a centre bearing, using a pin fitted to the under frame of the body and steadied by two side bearers. 

10. Cast steel bogies

11. The bogie consisted of three main parts - the bolster and the two side frames.  The basic arrangement provided for a set of steel coil springs provided inside an opening in each side frame of the bogie.   The bogie bolster was mounted on top of these springs and held in place by guides cast or bolted onto the bolster. The axle boxes were not sprung and merely slotted into the frame. The second set of springs only comes into contact with the truck bolster when it is depressed by the extra weight loaded on the vehicle. The loaded springs are stiffer than the empty springs so that the stability is maintained regardless of the load applied.

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