At Present, There Are Two Kinds Of Reducers Used In The Field Of Robots, One Is RV Reducer, The Other Is Harmonic Reducer. In Joint Robots, Because RV Reducer Has Higher Stiffness And Rotation Accuracy, RV Reducer Is Usually Placed In The Position Of Heavy Loads Such As Seat, Arm And Shoulder, While Harmonic Reducer Is Placed In The Arm, Wrist Or Hand. http://www.hnzkmachinery.com