... life and high load-bearing capacity. ISO9001-2008 standard Gear reducer introduced: gear reducer is external involute helical gears reducer, which ... is based on national professional standards ZBJ19004.Gear reducer are widely used in metallurgy, mining, lifting, transportation, ... stage more than 96.5%, dual-stage more than 93 %, three more than 90 %. 3.Smooth running, low noise. 4. ...