bogie assembly

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 1/17

Indian Railways,DLW,

Welcomes all of you

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 2/17

 Overview

on

BOGIE ASSEMBLY 

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 3/17

DESCRIPTION OF BOGIE 

Introduction :-

Bogies works as a leg of locomotive. 

It bears load of loco U/F, power pack , super structureand other accessories of locomotive.

It is very important assembly as per loco running andbraking in concern. 

Two bogies are used in one locomotive. 

One bogie contain three axle, 6 wheel, 3 tractionmotors, suspension arrangement. And brake rigging

etc. (except Bo-Bo bogie such as WDP1) . .

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 4/17

TYPES OF TRUCK FRAME

A. According to wheel arrangement bogie are totwo type mainly.

* Bo-Bo Bogie ( Bi axle bogie, axle independentlydriven ) it contain 2 axle 4 wheels, 2 TM.

* Co-Co Bogie ( Tri axle bogie, axle independentlydriven ) 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

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 5/17

11520905_2.jpg11520905_2.jpg

Bogie Arrangement 

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 6/17

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

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 7/17

CONTD.

EQUALISER BEAM

COMPENSATING BEAM

INNER AND OUTER SPRINGS

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 8/17

BOGIE FRAME

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 9/17

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 fromsteel plate to IS.2062 grade „C”.

3. The locomotive car body weight is transferred directly to the bogie framethrough 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 eachequalizer, to provide ride quality and equalization of wheel-set loads.

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 10/17

Bogie Suspensionarrangement 

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 11/17

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 betweenaxle and bogie frame.

7. Two hydraulic lateral dampers are provided in secondary stage betweenbogie frame and the loco under frame.

Safety links are provided at the lateral stop locations between bogieframe and the under frame.

9. These links serve to prevent separation of the bogie from thelocomotive car body in case of derailment and also provide means of lifting the bogie along-with the locomotive car body.

DESCRIPTION OF BOGIE continued

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 12/17

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

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 13/17

Axle, Wheel & Box assembly 

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 14/17

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

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 15/17

Brake Rigging Arrangement 

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 16/17

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

8/3/2019 Bogie Assembly

http://slidepdf.com/reader/full/bogie-assembly 17/17

THANKS