Hydraulic Disk Brake

The Hydraulic Disk brake is an arrangement of braking mechanism which uses brake fluid, which is ethylene glycol,for transferring pressure from the controlling mechanism to the braking mechanism.

In 1914 Fred Duesenberg started hydraulic brakes on his racing cars. In 1918 Malcolm Lougheed developed a hydraulic brake system.

WORKING :

1. In Disk Break System, It uses the wheel disc with the inner arrangement of master cylinder and brake pad as well as return spring arrangement.

2. The air from the compressor is used to operate the master cylinder at the certain pressure, here the solenoid valve is used to operate the master cylinder and it is controlled by the control unit.

3. when ever the brake apply the control unit will activate the solenoid valve to supply the sir from the compressor and it passed through the master cylinder then it will ex tern the piston rod which is inside of the master cylinder after releasing the control unit activate the solenoid valve to stop the supply from the compressor, then the master cylinder will released the piston rod to the original position.

IMAGE OF HYDRAULIC DISK BRAKE :

                       

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Six Stroke engine

Six-stroke engine :

In the six-stroke engine developed by the students of College of Engineering, Trivandrum, India, the first four strokes are the same as a four stroke internal combustion engine. 

After the exhaust stroke, instead of air/fuel mixture (as in case of petrol engines), fresh air is sucked into the cylinder from the air filter, and is removed during the sixth stroke. The valve overlaps have been removed and the additional two strokes have been provided for better scavenging, using air injection.

The engine shows 40% reduction in fuel consumption and dramatic reduction in pollution. Its specific power is not less than that of a four-stroke petrol engine. The engine can run on a variety of fuels, ranging from petrol and diesel to LPG. An altered engine shows a 65% reduction in CO pollution when compared with the four stroke engine from which it was developed.

The TrivandrumTeam : Aaron Joseph George, Arun K Nair, Boby Sebastian, and Krishnaraj U. It took them almost two years to develop the engine. 

Its features are:

1. Reduction in fuel consumption 
2. Dramatic reduction in pollution 
3. Better scavenging and more extraction of work per cycle 
4. Lower working temperature makes it easy to maintain optimum engine temperature level for better performance 
5. Less friction, so less wear and tear 
The six-stroke engine does not require any basic modification to the existing engines. All technological experience and production methods remain unaltered. 

This Engineering students have been awarded the 'Indian Society for Technical Education - National awarded' for Best B. Tech project of 2006. (ISTE/BBSBEC-B.Tech./Award/2006)

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