BOGIES AND SUSPENSION - South Central Railway
BOGIES AND SUSPENSION - South Central Railway
BOGIES AND SUSPENSION - South Central Railway
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CHAPTER 6 – <strong>BOGIES</strong> <strong>AND</strong> <strong>SUSPENSION</strong><br />
g) SPRING<br />
WAGON MAINTENANCE MANUAL<br />
Page 54 of 121<br />
It is a laminated bearing made out of a number of spring steel plates of<br />
different lengths fastened together in the centre by means of buckle and other<br />
fastenings. Plates are nibbed at suitable locations or have “rib and groove”<br />
section. On some BG springs a few plates are clamped together near both the<br />
ends by means of clips and its fastenings. Similar clamping has been recently<br />
been introduced on MG spring also. The top plate is rolled at the both ends to<br />
form an eye which receives the shackle pin.<br />
Bearing spring is a medium of transmitting wagon weight including<br />
consignment to the axle box. Any defect in the bearing spring would lead to<br />
undesirable loading of axle box and the bearing brass resulting in derailment<br />
or hot box. Bearing springs on both the ends are connected with the wagon<br />
underframe through the shackle pins, shackle plates and scroll iron. The<br />
central portion sits on the axle box crown.<br />
Springs are manufactured/ repaired in the workshops. It involves<br />
proper heat treatment, inspection and testing. The springs should not be<br />
repaired on open line where adequate repair facilities does not exists. On open<br />
line, inspection and checking of camber of springs should be done, and<br />
defective springs should be replaced.<br />
There are various types and sizes of springs in used on wagons, as<br />
different types of wagons were put on line from time to time. It is not possible<br />
to describe all types of spring here. Only standard types of springs are being<br />
described here. The factors causing difference in springs can be broadly<br />
classified as under:<br />
(i) Difference in material of plate<br />
They can be broadly classified as oil hardening and water<br />
hardening quality as indicated below.<br />
Sr. IS Spec. Equivalent IR Part Grade Type of steel Quality<br />
No. No. specification<br />
1 3885* M-11 I 4 Silico Oil hardening<br />
manganese steel quality<br />
2 3885** M-11 II 4 Silico Oil hardening<br />
manganese steel quality<br />
3 3885 M-11 I 3 Silico Water hardening<br />
manganese steel quality<br />
4 3885 M-10 I 1 Carbon spring Water hardening<br />
steel<br />
quality<br />
*-Used on all standard wagons except those given against Sr. No. 2.<br />
**-Used on Std. BOX, BCX, BOI, BRH & BRS types of wagons using UIC type of<br />
bogies and BG 4 wheeled 16.3 tonnes axle load wagon (except for top plate).
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