... for 100-2200W Frame,Alum alloy for 1#,2#,3#gear case,4#,5#,6# cast iron ... :Parts nameNotesGearboxThe output shaft diameter of gearbox 1#,2#,3# are 18,22,28mm separately.the material ... class6-7.Brake series:1.Economical and compact.2.High pressure-resistance,good insulation,insulation class F ... technical terms of small gear motor> in 2010;ZD developed China's first high-precision helical planetary gear ...