Railway Bogie and Suspension System

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Questions and Answers

What is the primary function of a bogie in a railway system?

To carry and tie all the components of the locomotive together (correct)

To change the direction of the train

To generate power for the locomotive

To control the speed of the train

What is the shape of the bogie frame used in MRT Line-6?

L-shape

H-shape (correct)

T-shape

I-shape

What type of bogie is used only in motor cars?

Air spring bogie

Type-2 trailer bogie

Motor bogie (correct)

Type-1 trailer bogie

What equipment is not found on a Type-1 trailer bogie?

Speed sensors for brake system installed on both axle boxes of each axle Signup and view all the answers

What is the purpose of the air injection type flange lubricator (oil mixed) on a Type-1 trailer bogie?

To lubricate the wheel flanges Signup and view all the answers

Where is the speed sensor for the signalling system installed on a Type-1 trailer bogie?

On one axle box of each car end side axle Signup and view all the answers

What is the function of the speed sensors installed on the axle box of each axle?

To measure the speed of the train for brake system Signup and view all the answers

What type of suspension is used in MRT Line-6's bogie?

Radius arm primary suspension and air spring secondary suspension Signup and view all the answers

What type of brake unit is installed on the transoms of the motor bogie?

Tread brake unit without parking brake Signup and view all the answers

What is the main difference between a Type-1 and Type-2 trailer bogie?

The location of the bogie on the trailer car Signup and view all the answers

What is mounted on the trailer bogie frame?

Traction link support Signup and view all the answers

What is the shape of the bogie frame?

Welded fabricated 'H-shape' frame Signup and view all the answers

What is the function of the primary suspension?

To provide excellent ride quality and running stability Signup and view all the answers

What is mounted on the side frame of the bogie?

Auxiliary air reservoir for the air spring Signup and view all the answers

What is the component that connects the wheelset to the bogie frame?

Wheelset hanger Signup and view all the answers

How many frame hangers are there on each bogie frame?

4 Signup and view all the answers

What is the type of wheel flange lubrication system used in the train?

Oil-mixed air injection type Signup and view all the answers

What is the primary function of the damper in a car's suspension system?

To control the motion of the spring and manage weight transfer and shock loads Signup and view all the answers

What is the purpose of the levelling valves in the secondary suspension?

To adjust the height of the carbody and platform Signup and view all the answers

How often does the wheel flange lubricator activate in straight sections of the track?

Every 2 minutes Signup and view all the answers

What is the purpose of the train moving directional signal in the wheel flange lubrication system?

To control the operation of the lubricators Signup and view all the answers

What is the function of the air spring's vertical rubber stopper?

To sustain the carbody safely when the air springs are deflated Signup and view all the answers

How is the diameter of the wheel measured?

Using a diameter gauge Signup and view all the answers

What is the purpose of the shim plate in the secondary suspension?

To enable adjustment of carbody height after wheel turning Signup and view all the answers

What is the purpose of adding a shim plate after wheel turning operation?

To adjust the 'B dimension' set height Signup and view all the answers

What is the function of the centre pin with the vertical stopper?

To permit lifting of the carbody and the bogies as a complete unit Signup and view all the answers

What is the formula for calculating the 'B dimension' set height?

H = 260 + t1 + t2 Signup and view all the answers

What is the function of the lateral stop rubbers in the secondary suspension?

To absorb impact forces due to lateral movement Signup and view all the answers

What type of suspension is the secondary suspension of the bogie?

Bolster-less suspension Signup and view all the answers

What is the thickness of each shim plate inserted between the bogie frame and air spring?

6 mm Signup and view all the answers

What is the location of the wheel flange lubricators on the train?

Both leading wheels Signup and view all the answers

What is the purpose of the single traction link with two single link rubber bushes in the secondary suspension?

To enable smooth movement of the bogie Signup and view all the answers

What is the purpose of the shim plate in bogie maintenance?

To ensure proper load transfer mechanism Signup and view all the answers

What is the sequence of load transfer from the car to the track?

Car load -> passenger load -> secondary suspension -> bogie frame -> axle box -> wheels -> track Signup and view all the answers

What is the thickness of the permanent shim under the carbody?

1 mm, 2 mm, and 3 mm Signup and view all the answers

Which component is responsible for transferring the tractive force to the car body?

Traction link Signup and view all the answers

What is the function of the axle box in the load transfer mechanism?

To transfer the load to the wheels Signup and view all the answers

What is the sequence of braking force transfer to the car body?

Wheel -> axle box -> primary suspension -> bogie frame -> traction link -> centre pivot -> car body Signup and view all the answers

What is the purpose of the centre pivot in the tractive force transfer mechanism?

To transfer the tractive force to the car body Signup and view all the answers

What is the term 'B'' referring to in the bogie overview?

Two wheel assemblies under the unit Signup and view all the answers

Study Notes

Bogie Overview

A bogie is a structure underneath a railway body that carries and ties all the components of the locomotive together.
Axles and wheels are attached through bearings.
MRT Line-6's bogie is a fabricated "H-shape" frame type without end beams.

Types of Bogie Used in MRT Line-6

There are three types of bogies: Motor Bogie, Type-1 Trailer Bogie, and Type-2 Trailer Bogie.
Motor Bogie is used in motor cars (M1/M2/M3/M4).
Type-1 Trailer Bogie is used in every Tc car's front side (cab end).
Type-2 Trailer Bogie is used in every Tc car's rear bogie (near gangway).

Bogie Components

Bogie Frame: a welded fabricated "H-shape" frame type consisting of two side frames and one transom.
Primary Suspension: provides excellent ride quality and running stability, consists of radius arm type axle box, primary spring with rubber seat, radius arm rubber bush, primary damper, and wheelset hanger.
Secondary Suspension: provides excellent ride quality and running stability, consists of centre pin, two air springs, two levelling valves, one lateral damper, two lateral stop rubbers, and one single traction link with two single link rubber bushes.

Secondary Suspension Components

Air Spring: has a vertical rubber stopper to sustain the carbody safely when deflated.
Levelling Valves: used for height adjustment between the train's floor and platform.
Shim Plate: added under the air spring to enable adjustment of carbody height after wheel turning.
Lateral Stop Rubbers: absorb impact forces due to lateral movement.

Wheel Flange Lubricator

The wheel flange lubrication system is of service-proven oil-mixed air injection type flange lubricator.
Lubricators are provided at both leading wheels of the train.
Activation: in straight sections, every 2 minutes, spraying lubricant for 6 seconds; in curve sections, every 3 seconds, spraying lubricant for 6 seconds.

Bogie Maintenance

Major damages of wheel: wheel tread profile wear limit dimensions, checked by mechanical gauge or automatic wheel profile meter.
Addition of Shim Plate: after wheel turning operation, to adjust carbody height.
Criteria for 'B' Dimension: H = 260 + t1 + t2, where H is the set height, t1 is the thickness of shim inserted between bogie frame and air spring, and t2 is the thickness of permanent shim under carbody.

Load Transfer Mechanism

The car + passenger load is transferred to the track through: secondary suspension, bogie frame, primary suspension, axle box, wheels, and track.

Tractive Force Transfer Mechanism

The tractive force is transferred to the car body through: traction motor, drive gear, axle, axle box, primary suspension, bogie frame, traction link, centre pivot, and car body.

Braking Force Transfer Mechanism

The braking force is transferred to the car body through: wheel, axle, axle box, primary suspension, bogie frame, traction link, centre pivot, and car body.

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Description

This quiz covers the overview of a bogie in a railway system, including its structure and components. It also discusses the bogie design used in MRT Line-6.