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 />
606. WHEEL ASSEMBLY<br />
A. Axle<br />
WAGON MAINTENANCE MANUAL<br />
Page 109 of 121<br />
An axle is a long steel bar to hold a pair of wheels in position. Carriage &<br />
Wagon axle is made of steel to specification No. IRS-R-16. Its journal portion is<br />
suitably designed to mount a plain or roller bearing. It can be divided into<br />
following portions:-<br />
i. Portion between the wheel seats.<br />
ii. Wheel seat on either side.<br />
iii. Shoulders just after the wheel seat on either side.<br />
iv. Journal just after the shoulder on either side.<br />
The portion of axle between the two wheel seats used to be made taper the<br />
lowest diameter being the centre of the axle. Now the practice of tapering axles<br />
have been discontinued and is made parallel. The portion of the axle on which the<br />
wheel centre is pressed is known as wheel seat. The seat is fine finish machined. The<br />
shoulder portion is also fine finish machined.<br />
Two small axle centres are drilled on end surfaces on the axle. These holes<br />
facilitate turning of the axle on centre lathes, grinding/furnishing of the journals and<br />
turning of the tyre on the wheel lathe.<br />
No collar is provided on roller bearing axles. Axle on which roller bearings<br />
are mounted should have surface finish and ovality as per drawing. To facilitate the<br />
locking of roller bearing in position, three holes are built and tapped on each face of<br />
the axle.<br />
B. WHEEL<br />
Wheels are of two types: solid and tyred. The tyred wheel consists of wheel<br />
centre, tyre and glut ring to fasten the tyre with the wheel centre. In solid wheels, the<br />
wheel centre and the tyre portion is rolled in one piece. Glut ring is therefore not<br />
required is case of solid wheels. Only solid wheel shall be procured for fitment.<br />
After solid wheels get worn to condemning size in case of four wheel BG<br />
wagon and MG wagons, it is machined to the size of the wheel centre and separate<br />
tyre is shrunk fit on it and suitably fastened by glut ring. When the tyre also reaches<br />
condemning limit it is removed by machining its lip opposite the glut ring a new tyre<br />
is fitted.
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