Indian Railways, DLW,

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Overview

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BOGIE ASSEMBLY

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) ..

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

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Bogie Arrangement

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

CONTD.

EQUALISER BEAM COMPENSATING BEAM INNER AND OUTER SPRINGS

BOGIE FRAME

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.

Bogie Suspension arrangement

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.

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.

DESCRIPTION OF BOGIE continued

Axle, Wheel & Box assembly

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

Brake Rigging Arrangement

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

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