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 />
II. COLUMN<br />
WAGON MAINTENANCE MANUAL<br />
Page 46 of 121<br />
There are two columns on either side of the bogie frame, one is<br />
left handed and another right handed. Each of them contains two holes<br />
through which the column bolt passes. It has an integrally cast bracket<br />
at the top to suspend the brake beam hanger. The column and the<br />
spring plank are riveted together. The inner rivet is counter sunk as per<br />
latest modification to avoid the possible infringement with the brake<br />
beam and brake block assembly. Its top and bottom surface, where top<br />
and bottom arch are connect are finish machined. Its surface around<br />
the rivet holes is also finish machined. The two columns are kept at<br />
sufficient distance to accommodate spring nest assembly and connect it<br />
at proper locations with the spring plank.<br />
The radius of column at bottom outer side on MG stock is 12<br />
mm. It has now been increased to 16 mm, to avoid its infringement<br />
with central radius portion of the unmodified tie bars. As per latest<br />
modifications, the centre of the radius of the tie bar which is 38 mm<br />
have been shifted towards the end by 3 mm. Where modified tie bars<br />
are used, the radius of the column need not be increased.<br />
III. TIE BAR<br />
Tie bar is made of 250 x 32 mm flat in MG Bogies and 150 x<br />
45 mm flat in BG bogie. Recently in order to remove the bogie column<br />
over the radius portion of tie bar, the centres of the radius has been<br />
altered.<br />
IV. STRENGTHENING BAR<br />
Due to large scale breakage of MG tie bars mostly at the<br />
bottom and top bends, a strengthening plate 10 mm thick and 125 mm<br />
wide has been provided at the bottom surface of tie bar. It covers the<br />
entire bottom and the radius portion of the bottom bends of the tie bar.<br />
The strengthening plate is secured with the tie bar by fillet welding at<br />
all the four edges. In the middle portion of the strengthening plate, two<br />
holes have been provided to plug weld it with the tie bar.<br />
Strengthening bar of section 125 x 22 mm is provided in the case of<br />
BG 22.9t bogie.<br />
Very recently, the length of the MG tie bar has been increased<br />
from 1740 mm to 1830 mm. In the increased length portion, one square<br />
piece 32 mm thick and 126 mm long is required to be fillet welded at<br />
outer edge and two side edges. Similar modification has also been<br />
carried out on BG 22.9t bogie.
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