crankshaft
n. countable C1 Advanced US //ˈkɹæŋkˌʃæft// UK //kɹˈæŋkʃɑːft// crank·shaft
n. a long metal bar with arms that turns the power from an engine into a circular motion. It is a key part of a car's engine that helps the wheels move.
n. a long metal shaft with a series of cranks and journals, used to convert reciprocating motion into rotary motion. It is a fundamental component of internal combustion engines and steam engines.
The mechanic replaced the worn crankshaft in the engine.
A damaged crankshaft can cause the engine to seize, requiring a complete engine rebuild to restore functionality.
Modern high-performance engines utilize forged steel crankshafts to withstand the immense torsional stresses generated by high-revving combustion cycles and heavy turbocharging.
From crank + shaft.