An Engine is a prime mover.It is the most important part of the automobile. Without engine, autmobile is dead. It is the heart of the automobile. The engine has two types:-
(i) External Combustion Engine (EC Engine)
(ii) Internal Combustion Engine (IC Engine)
IC Engine:- It is a heat engine in which the chemical energy of fuel is converted into thermal energy and then converted into mechanical energy.
The Main Components of IC Engine
- Cylinder
- Piston
- Connecting Rod
- Piston Rings
- Cam Shaft
- Crankshaft
- Crank Case
- Inlet and outlet valve
- Sparkplug
- Gudgeon pin
- Cylinder Head
- Cam Follower
- Valve Spring
- Big end bearing, etc
Working of IC Engine
Firstly, the crankshaft is driven by flywheel which is driven by the Starter motor. When the crankshaft rotates, piston can reciprocates by means of crankshaft design. A camshaft is also driven by crankshaft by means of chain and gear transmisson. When the camshaft rotates, rocker arm up-downs the valve(Inlet and Outlet valve). When the inlet valve open the air-fuel mixture and fuel comes in the combustion chamber or cylinder. In the next stroke of piston, air-fuel mixture compressd and then the sparkplug sparks air-fuel mixture, then its blast and gave the force with high torque to the piston this is called power stroke. in the last stroke, the exhaust of the fuel goes outside the cylinder by the opening of the exhaust valve.And this completes the cycle. then this cycle repeat again and again.