40 Questions
What is the primary function of a bogie in a railway system?
To carry and tie all the components of the locomotive together
What is the shape of the bogie frame used in MRT Line-6?
H-shape
What type of bogie is used only in motor cars?
Motor 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
What is the purpose of the air injection type flange lubricator (oil mixed) on a Type-1 trailer bogie?
To lubricate the wheel flanges
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
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
What type of suspension is used in MRT Line-6's bogie?
Radius arm primary suspension and air spring secondary suspension
What type of brake unit is installed on the transoms of the motor bogie?
Tread brake unit without parking brake
What is the main difference between a Type-1 and Type-2 trailer bogie?
The location of the bogie on the trailer car
What is mounted on the trailer bogie frame?
Traction link support
What is the shape of the bogie frame?
Welded fabricated 'H-shape' frame
What is the function of the primary suspension?
To provide excellent ride quality and running stability
What is mounted on the side frame of the bogie?
Auxiliary air reservoir for the air spring
What is the component that connects the wheelset to the bogie frame?
Wheelset hanger
How many frame hangers are there on each bogie frame?
4
What is the type of wheel flange lubrication system used in the train?
Oil-mixed air injection type
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
What is the purpose of the levelling valves in the secondary suspension?
To adjust the height of the carbody and platform
How often does the wheel flange lubricator activate in straight sections of the track?
Every 2 minutes
What is the purpose of the train moving directional signal in the wheel flange lubrication system?
To control the operation of the lubricators
What is the function of the air spring's vertical rubber stopper?
To sustain the carbody safely when the air springs are deflated
How is the diameter of the wheel measured?
Using a diameter gauge
What is the purpose of the shim plate in the secondary suspension?
To enable adjustment of carbody height after wheel turning
What is the purpose of adding a shim plate after wheel turning operation?
To adjust the 'B dimension' set height
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
What is the formula for calculating the 'B dimension' set height?
H = 260 + t1 + t2
What is the function of the lateral stop rubbers in the secondary suspension?
To absorb impact forces due to lateral movement
What type of suspension is the secondary suspension of the bogie?
Bolster-less suspension
What is the thickness of each shim plate inserted between the bogie frame and air spring?
6 mm
What is the location of the wheel flange lubricators on the train?
Both leading wheels
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
What is the purpose of the shim plate in bogie maintenance?
To ensure proper load transfer mechanism
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
What is the thickness of the permanent shim under the carbody?
1 mm, 2 mm, and 3 mm
Which component is responsible for transferring the tractive force to the car body?
Traction link
What is the function of the axle box in the load transfer mechanism?
To transfer the load to the wheels
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
What is the purpose of the centre pivot in the tractive force transfer mechanism?
To transfer the tractive force to the car body
What is the term 'B'' referring to in the bogie overview?
Two wheel assemblies under the unit
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.
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.
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