BOGIES AND SUSPENSION - South Central Railway

CHAPTER 6 – BOGIES AND SUSPENSION
WAGON MAINTENANCE MANUAL
Page 36 of 121
The side frame casting is hollow. In larger portion it forms a box
section and in some portion a “C” section. In the central portion of the casting,
there is an opening to accommodate the spring nest and floating bolster. On
either end of the casting on top, there is an extended portion called pedestal,
which rests over axle box top surface. It has two holes for axle box bolts. On
both bottom ends, there is an integrally cast bracket to secure the side frame
tie bar. The latter is secured to the frame by three rivets. The bottom portion of
the axle box rest on the tie bar. On the inner side of the casting, two brackets
are integrally cast in the central top portion to suspend the brake beam hanger.
The bottom surface of the top extended portion and the top surface of
the bottom integrally cast bracket meant to secure axle box and tie bar
respectively are finish machined. The centre opening, which receives the
spring plank and bolster assembly, is filed rough ground at all places except
on the top. The four axle box bolt holes in the extended portion are drilled.
There are six holes in the central opening at the bottom to secure the spring
plank by rivets. There are two holes in each of the integrally cast bracket to
rivet the tie bar with it. Each of the four brackets meant to suspend the brake
beam hanger has a hole. Bushes have been provided in the holes for wear and
tear caused due to the pin.
b) SPRING PLANK
The spring plank is manufactured by pressing the steel plate of
required thickness and size. The spring plank connects the two side frames and
keeps the latter at a fixed distance. It ensures the squareness and correct
alignment of the trolley.
The same type of spring plank is used on the cast steel bogie. The
vertical sides of spring plank are attached to the bogie column. In the case of
MG bogie, the two brake beam support plates are riveted to the spring plank
while in case of BG, a brake support channel is riveted to the spring plank
through angle cleats. The brake push rod safety loops are riveted to spring
plank in MG bogie while these are riveted to brake support channel in BG
bogie.
c) FLOATING BOGIE BOLSTER
The fabricated design of bogie bolster in lieu of cast steel bolster is in
use. The fabricated design fulfils all the requirements of cast steel bolster and
both are freely interchangeable. The same type of floating bolster is used on
diamond frame and casts steel bogie. It is fitted in transverse direction,
perpendicular to the track.