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CRANK GEAR
The crank gear takes the pressure of gases during the power stroke (combustion and expansion) and converts the rectilinear reciprocating mo-tion of the piston into the rotary motion of the crankshaft. The crank gear consists of a cylinder block with a crankcase, a cylinder head, pistons with rings, piston pins, connecting rods, a crankshaft, a flywheel, and an oil sump.
The cylinder block is the backbone of the engine to which all its mechanisms and parts are secured.
The piston takes up the pressure of gases during the power stroke and transmits it via the piston pin and connecting rod to the crankshaft. The upper part of the piston, called a crown, has grooves which receive the pis-ton rings. The bottom part, called a skirt, guides the piston in the cylinder. The piston skirt has bosses with holes for the piston pin.
The connecting rod serves to connect the piston to the crankshaft. The force applied to the piston during the power stroke is transmitted by the connecting rod to the crankshaft.
The crankshaft takes the forces transmitted from the pistons via the connecting rods and converts them into torque, which is then imparted via the flywheel to the drive line of the vehicle.

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