This document provides an overview of bogie assembly for locomotives. It describes that a bogie is a three-axle frame that supports the weight of the locomotive and runs on six wheels. The key components of a bogie include the bogie frame, axles, wheels, traction motors, suspension system, and brake rigging. It then discusses the types of bogies based on wheel arrangement and frame construction, as well as the important parts, suspension arrangement, and ride characteristics.

1. Indian Railways,
DLW,
Welcomes all of you

2. Overview
on
BOGIE ASSEMBLY

3. DESCRIPTION OF BOGIE
 Introduction :-
 Bogies works as a leg of locomotive.
 It bears load of loco U/F, power pack , super structure
and other accessories of locomotive.
 It is very important assembly as per loco running and
braking in concern.
 Two bogies are used in one locomotive.
 One bogie contain three axle, 6 wheel, 3 traction
motors, suspension arrangement. And brake rigging
etc. (except Bo-Bo bogie such as WDP1) .
.

4. TYPES OF TRUCK FRAME
 A. According to wheel arrangement bogie are to
two type mainly.
 * Bo-Bo Bogie ( Bi axle bogie, axle independently
driven ) it contain 2 axle 4 wheels, 2 TM.
 * Co-Co Bogie ( Tri axle bogie, axle independently
driven ) it contain 3 axle 6 wheels, 3 TM.
 B. According to truck frame manufacturing method.
 * Cast steel type truck frame such as YDM4,
WDM2, WDS6, WDG4, WDP4.
 * Fabricated truck frame such as WDG3A, WDM3D,
WDP2, WDP1

5. Bogie Arrangement
1111552200990055__22..jjppgg

6. IMPORTANT PARTS OF THE BOGIE
 BOGIE FRAME(TRUCK FRAME)
 AXLE
 WHEELS
 BULL GEARS
 SUSPENSION TUBE
 AXLE BOXES
 TRACTION MOTORS
 BRAKE RIGGING ITEMS(LEVERS)
 AIR PIPING

7. CONTD.
 EQUALISER BEAM
 COMPENSATING BEAM
 INNER AND OUTER SPRINGS

8. BOGIE FRAME

9. DESCRIPTION OF BOGIE
1. WDG3A/WDM3D loco is provided with fabricated bogie. This is a three-axle,two-stage
suspension with helical coil springs in primary stage and rubber
compression springs in secondary stage of suspension & floating type center
pivot arrangement.
2. The bogie frame shall be fabricated box type construction, manufactured from
steel plate to IS.2062 grade ‘C”.
3. The locomotive car body weight is transferred directly to the bogie frame
through four rubber “Compression” spring assemblies.
4. The bogie frame is supported through “soft primary” suspension consisting of
eight pairs of helical coil springs(inner & outer). Two springs mounted on each
equalizer, to provide ride quality and equalization of wheel-set loads.

10. Bogie Suspension
arrangement

11. DESCRIPTION OF BOGIE
continued
5. Center pivot does not take any vertical load and is used only for transfer
of traction and braking forces.
6. Four vertical hydraulic dampers are provided in primary stage between
axle and bogie frame.
7. Two hydraulic lateral dampers are provided in secondary stage between
bogie frame and the loco under frame.
Safety links are provided at the lateral stop locations between bogie
frame and the under frame.
9. These links serve to prevent separation of the bogie from the
locomotive car body in case of derailment and also provide means of
lifting the bogie along-with the locomotive car body.

12. DESCRIPTION OF BOGIE
continued
10. The Bogie is provided with conventional type, double
shoe per wheel powered by two air brake cylinders.
Manually operated slack adjusters are provided to
maintain the gap between brake shoe & wheel .
11. In WDG3A bogies, four numbers Bogie mounted sand
boxes provided for sanding during wheel slip.
12. Wheel arrangement is of Co-Co type.

13. Axle, Wheel & Box assembly

14. Axle, Wheel pressing.
1. Mounting pressure for Wheel. 95-132 Tonnes
2. Mounting pressure for Gear 80-95 Tonnes
3. Mounting pressure for Axle collar 8-10 Tonnes
Uniform rise in pressure to be maintained

15. Brake Rigging Arrangement

16. Ride Characteristics
Designed speed 100 km/h for WDG3A
 Designed speed 120 km/h for WDM3D
 Axle load 20.5 t for WDG3A
 Axle load 19.5 t for WDM3D
 Wheel Diameter 1097 mm.
 Condemning limit of wheel 1016 mm.
 BHEL TM 4907 for WDG3A
 BHEL TM 5002 for WDM3D
 Gear ratio 18:74 (WDG3A)
Gear ratio 18:65 (WDM3D)
Curve negotiation – Minimum radius , which a loco
may negotiate – Here it is176 feet

17. THANKS