Working of a Two Stroke Engine in Hindi with Animation
In small engines, the exhaust and inlet ports are made in the cylinder block. When a piston comes down from the Top Dead Center (TDC) to the Bottom Dead Center (BDC) during a power stroke, it opens the exhaust port. Due to this uncovering of the port, exhaust gases are allowed to escape. As the piston travels down a little more, it also uncovers the inlet port which is usually located opposite the exhaust port. Due to uncovering of the inlet port by the piston, a fresh charge comes into the cylinder.
Hence, suction and exhaust are completed in one stroke.
When a piston travels up from the BDC to TDC, it covers both, the inlet and exhaust ports and so the charge gets trapped and compressed. This is the commencement of a compression stroke. When a piston reaches the TDC, a spark is triggered from the spark plug and the charge (the mixture of air and fuel) ignites. The charge gets expanded due to rapid combustion caused by the explosion and it causes the piston to move down with force. This is known as a power stroke.
At the same time, when the piston is at the TDC, the piston skirt uncovers the port in the cylinder block from where a fresh charge goes into the crank case due to a partial vacuum created by the crank shaft and its weight. Thereafter, when the piston starts moving down in a power stroke, the charge which has come in to the crank case is pressed by crank weights to the inlet port side, ready to be taken to the cylinder. In this way, a whole cycle is completed.
Working of a Four Stroke Engine in Hindi with Animation: • Working of a Four Stroke Engine in Hindi w...
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