16-08-2014, 01:57 PM
SEMINAR REPORT ON DUAL AIR BRAKE SYSTEM
DUAL AIR BRAKE SYSTEM.pptx (Size: 815.49 KB / Downloads: 33)
INTRODUCTION
Air brakes are commonly used on heavier vehicle.
A brake system that uses dual master cylinder.
Mechanically secured parking brakes.
Similar to Rolls-Royce braking.
AIR BRAKE SYSTEM
Elements of air brake system :
Air compressor
Governor
Reservoir
Safety valve
Brake chamber
The following components are exclusive to a foundation air-brake system
Air compressor: Pumps the air into storage tanks to be used in the brake system.
Air compressor governor: Controls the cut-in and cut-out point of the air compressor to maintain a set amount of air in the tank or tanks
Air reservoir tanks: Hold compressed or pressurized air to be used by the braking system
Drain valves: Release valves in the air tanks used to drain the air when the vehicle isn't in use.
Foot valve (brake pedal): When depressed, air is released from the reservoir tanks
Brake chambers: Cylindrical container that houses a slack adjuster that moves a diaphragm or cam mechanism.
DUAL AIR BRAKE SYSTEM
A dual air brake system has two separate air brake systems.
Primary and secondary systems.
A brake system that uses two hydraulic circuits.
To shorten stopping distances and reduce brake failures .
Air compressor build up a minimum of 100 psi pressure in both systems.
WORKING OF DABS
On a two–axle vehicle, one circuit operates the rear axle and the other circuit operates the front axle.
Wet reservoir Primary Secondary reservoir.
Blended air is used to supply the spring parking brake control valve.
If air is lost in both circuits, the spring brakes will apply.
Locking of diagonal axels