To complete one operating cycle, a four-stroke engine takes four distinct piston strokes. It is an internal combustion engine that requires two revolutions of the crankshaft. One operating cycle includes intake, compression, power, and exhaust. Parts of this engine are the piston, crankshaft, connecting rod, flywheel, inlet and outlet valves, and spark plug. Through the help of a connecting rod, a piston can transfer the increasing push of gas to the mechanical rotation of the crankshaft. A crankshaft helps to transform the reciprocating motion into rotational motion. Connecting rod acts as a lever arm that transfers the motion from a piston to a crankshaft.
The energy is stored in a flywheel which is nothing but a rotating mechanical device. Inlet and outlet valves allow fresh air with fuel to enter easily and remove the spent air-fuel mixture from the cylinder. The first step of this engine’s cycle is suction or intake stroke. In this, the inlet valve remains to open a few degrees and then closes sealing the air-fuel mixture in the cylinder. Here, the crankshaft rotation is 180 degrees. The next phase of this cycle is compression stroke in which the inlet and outlet valves remain closed to maintain the compression inside the cylinder. Now, we will proceed to the combustion stroke, also known as the power stroke which is the next step of this operational cycle. In this, various hot expanding gases push the piston away from the cylinder head. In this, both valves remain closed. The last step of this cycle is the exhaust stroke in which the cylinder is filled with exhaust gases and combustion is completed. A four-stroke engine is one most frequent choices of engine parts manufacturers in India. As the two-stroke engine tends to wear out early due to its higher RPM, the four-stroke engine is a suitable choice for many manufacturers.
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