Crankshaft
The main shaft of an engine that converts the reciprocating
(up and down) motions of the pistons and rods to rotary motion and delivers it to the
front and rear of the engine. To convert the reciprocating
(up-and-down) motion into rotation, the crankshaft has bearing
surfaces, called crankpins, whose axis is offset from that
of the crank, to which the "big ends" of the connecting rods from each cylinder are attached. One of the most important parts
of the engine, the crankshaft drives the car?s wheels, and,
through, a system of pulleys and belts or chains, the camshaft, water pump, and alternator.
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