crank disk including pin

例句：

1. 1.The car's engine is located in the crank case.
   汽车的发动机位于曲柄箱内。
2. 2. The crankshaft is responsible for converting the engine's power to the wheels.
   曲柄轴负责将引擎的动力转化为车轮的动力。
3. 3.The technician had to dismantle the crank case to replace the worn-out bearings.
   技术人员不得不拆卸曲柄箱以更换磨损的轴承。