Cimmco wagon mfg and suspension system

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

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

Nested Secondary Spring

Assembly

Yaw Damper

Cross Section

Bogie Bolster

Sec. Vertical Damper

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

Schematic diagram of a primary and seconary suspension system

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. 

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.

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. 

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. 

Cast steel bogies

•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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