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VACUUM BRAKE

Presented By :-

YATHISH B R

5th Sem

D.ME

VISSJPOLYTECHNIC

BHDRAVATHI



PRESENTATION OF

V ACUUM BRAKE



T ABLE OF C ONTENTS

1. Project Details

2. Overview Of Vacuum Brake

3. Parts of the Vacuum Brake System

4. How the automatic vacuum brake works

5. Present-day use of vacuum brakes



P ROJECT DETAILS

Project Name: - Vacuum brake

Objective Name: - To give a brief description of Vacuum brake

Sources of Information: -

Internet: -

1. http://www.google.co.in

2. http://www.wikipedia.org

3. http://www.stratfordbroadwayrailway.co.uk



OVERVIEW OF V ACUUM BRAKE

History-

The vacuum brake is a braking system employed on trains and

introduced in the mid-1860s. . A variant, the automatic vacuum

brake system, became almost universal in British train equipmentand in those countries influenced by British practice.



OVERVIEW OF VACUUM

BRAKE It was an alternative to the air brake, known as the vacuum

brake. Like the air brake, the vacuum brake system is controlled

through a brake pipe connecting a brake valve in the driver's cab

with braking equipment on every vehicle.



P ARTS OF THE V ACUUM BRAKE S YSTEM

This diagram shows the principal parts of the vacuum

brake system




Driver's Brake Valve- The means by whichthe driver controls the brake.

Exhauster- A two-speed rotary machine

fitted to a train to evacuate the atmospheric pressure

Brake Pipe- The vacuum-carrying piperunning the length of the train

Dummy Coupling- At the ends of each

vehicle

Coupled Hoses- The brake pipe is carriedbetween adjacent vehicles through flexiblehoses




Brake Cylinder - The movement of the

piston contained inside the cylinder operates

the brakes through links called "rigging´

Vacuum Reservoir -difference in pressure

between one side of the brake cylinder piston

and the other.

Brake Block - made of cast iron or some

composition material

Brake Rigging - the movement of the brake

cylinder piston transmits pressure to thebrake blocks on each wheel

Ball Valve -needed to ensure that the

vacuum in the vacuum reservoir is

maintained at the required level



H OW THE AUTOMATIC VACUUM

BRAKE WORKS

Vacuum brake cylinder in running position: the

vacuum is the same above and below the piston



H OW THE AUTOMATIC VACUUM

BRAKE WORKS

The principle of vacuume brake system is when

the pipe was charged with the vacuum induced in

it the brake appiilied the system used a cylinder

.on each vechicle which contained a pisten

connected to the brake shoes or through riging a

system of rods and .levers.



P RESENT - DAY USE OF VACUUM BRAKES

Today's largest operators of trains equipped with

vacuum brakes are the Railways of India and

Spoornet (South Africa), however there are also

trains with air brakes and dual brakes in use.



CONCLUTION

The air break was the clear winner in terms of

stopping power and become widly used around

the world but the vacuum break simpler and

cheaper and was eventually adopted by most of

major railway company in Britain.

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