As the piston descended, a ratchet engaged the piston rod and engine shaft and thus power was transmitted.
当活塞下行时，棘轮连接活塞杆和发动机轴，因此将功率输送出去。
2
Pulse electromagnetic DC motors, in their simplest form, consist of electromagnet with armature and ratchet wheel mounted on shaft. The right end of armature carries pawl.