BOGIES AND SUSPENSION - South Central Railway

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CHAPTER 6 – BOGIES AND SUSPENSION SPRINGS Bogie Type Spring free height Recommended free nominal (mm) condemning height (mm) All version except Outer 260 245 CASNUB 22 HS Inner 262 247 Snubber 294 279 ` CASNUB 22 HS Outer 260 245 Inner 243 228 Snubber 293 278 WAGON MAINTENANCE MANUAL Page 16 of 121 It is recommended that springs having less than 3 mm free height variation should be assemble in the same group. Mixing of new and old spring must be avoided. The bogie is fitted with two groups of long helical spring nests. The spring groups per bogie for various axle load applications are as under: Axle Load Number of Springs Outer Inner Snubber 22.9 t 14 10 4 20.3 t 12 8 4 20.3 t (22HS) 14 12 4 16.3 t 8 8 4 601 F. REFERENCE DRAWING NUMBERS FOR COMPONENTS Sr.No. Components Drawing No./Pamphlet No. 1. AAR taper cartridge bearing BP-200923-1-NBC G 81,1st revision issued by RDSO 2. Worn Wheel Profile WD-88021, or as per drg. 3. Wide jaw adapter for CASNUB 22w & RDSO Sketch No. Sk- 78527 CASNUB 22 W(M) 4. Wheel set and retainer bolt foe CASNUB 22W (without Elastomeric pad) WA/WL-4902, Sk-68512, WD-89025- S/1, Sk-69594 (retainer bolt) 5. CASNUB 22 W(M) wheel set WA/WL-4902/WD-89025-S/1 6. CASNUB 22 NL,22NLB & 22HS with wheel set WD-89025-S/1 7. Leading dimension and tolerances Sk-69599(W), WD-85054-S/6(22WM), WD-90042-S/1(NLB), WD-92058- S/7(HS) 8. Load bearing Springs & Snubber WD-83069-S/1(All versions except Springs 22HS Bogies) WD-92058-S/5 (22HS Bogies)
CHAPTER 6 – BOGIES AND SUSPENSION WAGON MAINTENANCE MANUAL Page 17 of 121 Sr.No. Components Drawing No./Pamphlet No. 9. Springs Silico Mangnese steel to IS : 3195 Gr 60 Si7, Gr 60 Cr4V2 Gr. 51 CrMoV4, IRS specification R2 and RDSO specification WD-01-HLS-94 (rev.1) 10. Centre pivot CASNUB 22W W/BE-601 for top pivot W/BE-602 for Bottom pivot 11. Centre pivot other than CASNUB 22W WD-85079-S/2 12. Elastomeric Pads WD-89067-S/10, WD-92058-S/8 (for HS), WD-95005-S/1 13. Side Bearer Rubber Pads WD-85076-S/1 14. Brake Block WA/BG-6158 15. CASNUB 22W(M) bogie, brake beam, WD-85084-S/1, WD-88012-S/1, brake head & block assembly WD-86034-S/1 16. Brake beam [22W, 22NLB & 22HS] Sk-69596, WD-89033-S/1 602. FABRICATED BOX BOGIE (UIC BOGIE) 602A. GENERAL DESCRIPTION These bogies are used on BOX, BCX, BCXT, BRH, BRS wagons. It is also known as UIC bogie. The BOX bogie is designed for an axle load of 20.3t. It is an all welded, plate fabricated bogie having a fixed bolster with hemispherical centre pivot and primary suspension incorporating four laminated bearing springs with long links supported by mild steel stones. The suspension arrangement and axle box design with liberal lateral and longitudinal clearance are intended to permit the wheel set to “float” relative to the bogie frame, with the object of improving the riding characteristics of the bogie. The roller bearing axle boxes are provided with “L” type lugs, so that in its lateral movement, wheel set is constrained by only one axle box at a time and there is no reversal in bending of bogie sole plate. 602 B. CONSTRUCTIONAL DETAILS A limited number of mark ‘O’ type bogies were applied on BOX, BRH and BRS type wagons during their initial production. The bogie frame of the Mark ‘O’ type is of a riveted cum welded construction whereas Mark-I has an all welded plate fabricated bogie frame. Apart from this basic change in the construction of the bogie frame, there is no change in any of the general design features between Mark-I and Mark ‘O’ bogies. Both of them are interchangeable. Mark ‘O’ bogies has withdrawn from service.
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