The main driving shaft of an engine that receives reciprocating motion from the pistons and converts it to rotary motion. Together, the crankshaft and the connecting rods transform the pistons’ reciprocating motion into rotary motion.

The main driving shaft of an engine that receives reciprocating motion from the pistons and converts it to rotary motion. Together, the crankshaft and the connecting rods transform the pistons’ reciprocating motion into rotary motion.