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what are the main parts of DG? explian thier functions?
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Answer Posted / haresh panchal
Diesel Engine is divided into two major section :
Diesel Engine
Alternator
1 MAIN PARTS OF A DIESEL ENGINE
The Diesel Engine consists following main parts.
1.1 Piston
Piston cylinder has two jobs :
To compress the air.
To release the pressure of the gases while they are burning.
1.2 Cylinder Head
A cylinder head closes the top end of the cylinder. It makes a confined space for compress air and
the gases.
1.3 Valves/ Ports
To admit the air & to discharge the exhaust gases.
1.4 Connecting Rod
To transmit force in either direction between the piston and the crank on the crankshaft.
1.5 Main Bearing
Support the crank shaft and permit it to rotate
1.6 Supporting Structure
It holds the cylinder, crankshaft and main bearing in firm relation to each other. This structure is
made up of two parts, the frame and the bed plate.
1.7 Fuel Injection Pump
It forces the oil into cylinder and fuel injection nozzle breaks up the oil into fine spray.
1.8 Crankshaft
To operate the fuel injection pump and the valve.
1.9 Fly Wheel
To store the surplus energy of the power stroke & to return that energy when the piston is being
pushed upward on the compression stroke.
1.10 Blower
To force air in to cylinder.
1.11 Miscellaneous Parts
Miscellaneous parts such as piping to supply air and remove exhaust gases, lubrication system etc.
2. MAIN PARTS OF ALTERNATOR
The alternator has following main parts.
2.1 Rotor
Rotor are of two types :
Salient pole type
Smooth cylinder type
2.2 Stator
The stator is equipped with seal type bearing & it requires no lubrication. Stator is insulated on
one side with paper or varnish and housed in a frame.
2.3 Exciter
The Exciter is generally a DC shunt motor or compound generator whose voltage is 250 V. In
small alternator, the Exciter is mounted on the same shaft of the alternator.
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