07-11-2012, 02:11 PM
Suspension system
Suspension system.pptx (Size: 366.7 KB / Downloads: 28)
Plate frame bogie primary suspension
This system was based on a steel plate framed bogie with laminated spring axle box suspension and with a secondary suspension added between the car body and the bogie.
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 height of the bogie relative to the rail level can be adjusted by using the screwed spring hangers.
Plate Frame Bogie Secondary Suspension
The secondary suspension of the bogie is mounted crosswise (transversely) in the centre. It looks as shown below:
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.
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.
Suspension system.pptx (Size: 366.7 KB / Downloads: 28)
Plate frame bogie primary suspension
This system was based on a steel plate framed bogie with laminated spring axle box suspension and with a secondary suspension added between the car body and the bogie.
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 height of the bogie relative to the rail level can be adjusted by using the screwed spring hangers.
Plate Frame Bogie Secondary Suspension
The secondary suspension of the bogie is mounted crosswise (transversely) in the centre. It looks as shown below:
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.
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.