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 />
WAGON MAINTENANCE MANUAL<br />
Page 63 of 121<br />
There are ten rivet holes on MG & 11 on BG on each axle guard leg. The<br />
bottom hole/holes is/are meant for riveting briddle bar with axle guard leg. Its dia is<br />
17.5 mm (for 16 mm rivet) starting from top two holes in the vertical row and 2/3<br />
holes on the indicated row are meant to rivet the axle guard with the sole bar. The 3rd<br />
rivet hole in case of BG and 3rd & 4th rivet hole in case of MG, from top of the first<br />
row are chamfered on outer face of the axle guard to enable use of countersunk rivets,<br />
thus preventing infringement of bearing spring with axle guard rivets. The horn cheek<br />
is riveted to axle guard with a packing plate in between them through 3rd to 6th rivet<br />
hole in case of BG and 4th to 7th rivet hole in case of MG. In case of MG, the<br />
packing plate is riveted through the third rivet hole in addition.<br />
The bridle bar is riveted to the axle guard through the 8th rivet hole in case of<br />
MG and 7th & 8th rivet hole in case of BG. In addition to the above, BG axle guards<br />
are further secured with the bottom flange of the sole bar channel by an angle cleat.<br />
Angle cleat is riveted to the sole bar and axle guard by three rivets on its each side.<br />
It is very important that the 10/11 th rivet holes are correctly drilled otherwise it<br />
will cause difficulty in securing the axle guard with the sole bar, horn cheek packing<br />
plate and bridle bar with axle guards.<br />
b) AXLE GUARD (LEG TYPE IRCA)<br />
It is made of steel plate Grade ST 42-S ‘A’ to specification No. IS:226. It has<br />
a vertical leg with a sloping arm branching upwards from about 1/3rd distance from<br />
the bottom. The sloping arm after certain distance is again bent to become vertical<br />
and parallel to the main vertical leg. All the three arms are made out of one plate with<br />
vertical arm and sloping arm close to each other. After cutting the sloping arm is hot<br />
bent to required shape. The important sizes of MG axle guard are :-<br />
Thickness of the plate - 20 mm (MG) 25 mm (BG)<br />
Width of the vertical leg - 70 mm (MG) 115 mm (BG)<br />
Width of the small vertical<br />
& sloping arm - 57 mm (MG 102 mm (BG)<br />
Dia of rivet holes 8 of 21.5 mm for 10 of 24 mm<br />
20 mm rivets(MG) for 22 mm rivets (BG)<br />
Dia of bottom rivet hole<br />
for bridle bar - 11.5 mm for 16 mm rivets.<br />
There are 7/8 rivet holes in the main vertical arm and 2/3 in short vertical arm.<br />
The bottom most rivet hole in the main vertical arm is meant for bridle bar, 2/3 rivet<br />
holes of the small vertical arm. Corresponding 2/3 rivet holes of the small vertical arm<br />
and corresponding 2/3 rivet holes in the main vertical arm are meant to rivet axle<br />
guard with the sole bar. The remaining four rivet holes in the main vertical arm are<br />
meant to rivet the horn cheek. Unlike pressed steel type, right handed and left handed<br />
axle guards legs are not required in this case.
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