What you're looking for is the electromagnet (solenoid). which turns the first gearin the geartrain.
你要找的是电磁体(螺线管),在传动机构中驱动第一齿轮。
2
This equation is useful in determining the kinematic linkage between the lathe spindle and the lead screw and enables proper selection of the geartrain between them.
这公式在决定车床心轴和丝杆之间的运动学关系时很有用,并且提供了正确挑选它们之间轮系的方法。
3
The clutch is also used to disengage the engine from the drive train whenever the gears in the transmission are being shifted from gear ratio to another.