BOGIES AND SUSPENSION - South Central Railway

More documents

Recommendations

Info

CHAPTER 6 – BOGIES AND SUSPENSION WAGON MAINTENANCE MANUAL Page 38 of 121 It has the same construction as that of bottom side-bearers except that its flanges are inclined instead of being parallel to its bottom surface. The inclination has been given to match the profile of the underframe to which it is fitted. The prescribed clearances for the side-bearers are as under: Clearance in one side Total Clearance New 3 mm Nominal 6 mm Worn 6 mm Maximum 12 mm As wagon body does not always rest horizontally, side-bearer clearances should be measured on both the sides by feeler gauge. Action should be taken on the basis of total clearance. f) SPRING NEST ASSEMBLY Spring nest assembly consists of two spring plates, four outer and four inner coil springs. The bottom spring plate rests on the spring plank. The nibbed portion of spring plate sits in the two holes provided in the spring plank. This arrangement keeps the spring plate in position. There are four washers riveted to each spring plate at suitable locations. At each of these locations, one inner and one outer coil spring is placed. The raised portion of the spring plank (made by riveting the washer) prevents displacement of the coil springs. The inner coil has opposite hand to the outer coil. On the top of these coil springs, the top spring plate rests. On the top surface of the top spring plate, the floating bolster is placed. In the floating bolster, there are two holes at each end to receive the nibbed portion of the top spring plate. g) SPRING PLATE It is made out of steel plate. On the outer side, it is bent at right angles. There are four holes at a suitable distance to rivet washers with it. Washer is made of steel. In the central position, the plate is nibbed at two locations. The nibbed portion sits against the holes in the spring plate/floating bolster and prevents the displacement of coil spring in service. Generally four nests of springs are required on each side of the bogie/trolley. The number may vary with heavier axle load bogies. The same type of springs are used in the diamond frame and cast steel bogies. Each nest consists of an outer coil spring and an inner coil spring of circular section. The outer spring has left-handed coils while the inner one has right-handed coils. These springs are made of spring steel hardened and tempered. After manufacturing, the “IRS” part no., Maker’s name and year of manufacture should be stamped as specified in the standard drawing while the spring is hot.
CHAPTER 6 – BOGIES AND SUSPENSION h. COIL SPRING WAGON MAINTENANCE MANUAL Page 39 of 121 The spring shall be manufactured as per the schedule of Technical Requirement for hot coiled helical springs WD-01-HLS-94 ( Rev. I May, 95 with latest amendment) by the spring manufacturers approved by RDSO. Procurement of spring steel shall be done only from reputed manufacturers approved by RDSO. Only spring steel bars duly inspected and passed by RDSO shall be used for manufacture of springs. Type Coil Dia. (mm) MG Outer Drg.No. W/BE-816 Inner Drg.No. W/BE-761 BG Outer Drg.No. W/BE-606 Inner Drg.No. W/BE-607 TABLE 6.2 IMPORTANT DIMENSIONS OF COIL SPRING 26 14 30 16 Free ht. (mm) 252 252 225 225 Height in mm Load (Tonnes) ½ 1 1.25 2 3 4 5 - 229 - 211 239 207 217.5 197 i) AXLE BOX WITH SIDE FRAME - - - 190 226 - 210 - 213 - 202 - - - 194.5 - - - Home ht. (mm) There are two bolt hole on each axle box to fit it rigidly with the frame. On both longitudinal ends, there are two projections in axle box casting, one on the top and another at the bottom. One common bolt hole is centrally drilled through both these projections. The outer surface of the projection is finish machined. The top surface of the projection rests below the corresponding machined surface of the extended portion of the side frame in case of cast steel bogies and below the bottom arch bar in case of diamond frame bogies. The bottom surface of the bottom projection presses the machined surface of the tie bars in both type of trolleys. The bolt passes through these holes connecting the three parts together and holds them rigidly. Two locking plates are inserted in each bolt, one after the bolt head on the top and the other before the nut in the bottom. After tightening the nut fully, the locking plates are bent at right angles against the edges of the nut/bolt head to prevent turning of nut or bolt. On diamond frame bogies, in order to facilitate proper fitment of the axle box, the transverse edges on the top projections are chamfered to 3 mm x 45 degree on both sides as per latest modification. 187 - 195 191 180 180 Defle -ction per tonne in mm 13 45 7.6 28
Page 1 and 2: CHAPTER 6 - BOGIES AND SUSPENSION W
Page 3 and 4: CHAPTER 6 - BOGIES AND SUSPENSION T
Page 5 and 6: CHAPTER 6 - BOGIES AND SUSPENSION b
Page 7 and 8: CHAPTER 6 - BOGIES AND SUSPENSION f
Page 15 and 16: CHAPTER 6 - BOGIES AND SUSPENSION 5
Page 25 and 26: CHAPTER 6 - BOGIES AND SUSPENSION o
Page 27 and 28: CHAPTER 6 - BOGIES AND SUSPENSION x
Page 37: CHAPTER 6 - BOGIES AND SUSPENSION W
Page 41 and 42: CHAPTER 6 - BOGIES AND SUSPENSION c
Page 43 and 44: CHAPTER 6 - BOGIES AND SUSPENSION f
Page 47 and 48: CHAPTER 6 - BOGIES AND SUSPENSION V
Page 53 and 54: CHAPTER 6 - BOGIES AND SUSPENSION d
Page 57 and 58: CHAPTER 6 - BOGIES AND SUSPENSION F
Page 59 and 60: CHAPTER 6 - BOGIES AND SUSPENSION d
Page 67 and 68: CHAPTER 6 - BOGIES AND SUSPENSION B
Page 73 and 74: CHAPTER 6 - BOGIES AND SUSPENSION B
Page 75 and 76: CHAPTER 6 - BOGIES AND SUSPENSION e
Page 79 and 80: CHAPTER 6 - BOGIES AND SUSPENSION e
Page 83 and 84: CHAPTER 6 - BOGIES AND SUSPENSION S
Page 89 and 90:
CHAPTER 6 - BOGIES AND SUSPENSION W
Page 91 and 92:
CHAPTER 6 - BOGIES AND SUSPENSION I
Page 93 and 94:
CHAPTER 6 - BOGIES AND SUSPENSION P
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
CHAPTER 6 - BOGIES AND SUSPENSION 1
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
45 0 45 0 45 0 6 6 6 20 mm. THICK F
Page 115 and 116:
CHAPTER 6 - BOGIES AND SUSPENSION G
Page 117 and 118:
Page 119 and 120:
Page 121:
CHAPTER 6 - BOGIES AND SUSPENSION S
show all

BOGIES AND SUSPENSION - South Central Railway

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?