Crankshaft

That part of the engine which transmits the reciprocating motion of the pistons to the driven unit in the form of rotary motion. That part to which the connecting rods are attached.

In the case of many of the older stationary engines the crankcase was open.

Open crank stationary engine.

See also: Big End, Connecting Rod, Crank, Crankcase, Internal Combustion Engine, Top Dead Centre.