피스톤의 왕복 운동을 회전 운동으로 바꾸는 엔진의 주요 축.
A shaft driven by a crank, especially one in an internal combustion engine that converts the reciprocating motion of the pistons into rotational motion.
예문:
"The mechanic discovered a hairline fracture in the crankshaft during the engine overhaul."
"A heavy-duty crankshaft is essential for high-performance racing engines to withstand extreme torque."