... electric engine gearbox 2.Body material,aluminium alloy and cast iron 3.Convenient mounting for gears,motors Features, 1) High precision ... speed regulating for electric engine gearbox,precise exact to 0.5-1 round2) Large speed-changing range,1:1.4 to ... ,aluminium alloy body; UD1.1,UD1.5,UD2.2,UD3.0,UD4.0,UD5.5,UD7.5,cast iron body9) Mounted way,vertical and ...