上海充通大学 Types of Gear trains Design a reverted compound gear train for a gear ratio of 18:1 =18 18=3x6→N3=6N2,N5=3N4 N, N2+N3=N4+N =constant N2+6N2=N4+3N4=C -3 7N2=4N4=C >Take C=28,then N,=4,N=7 >This is too small for a gear!Choose C=28x4=112(say) 亿ad N2=16,N3=96, 。 N4=28,N5=84 Counterhaft 上游克通大 Planetary or Epicyclic Gears Conventional gearset has one DOF If you remove the ground at gear 3,it has two DOF 3 Output 0=0 Input #1 Input #1 Arm Arm. Output Planet gear Input #2 Pinion Gear Sun gear (a)Conventional gearset (b)Ranetary or epicyclic gearset9 3 5 2 4 18 N N N N           Design a reverted compound gear train for a gear ratio of 18:1 18=3x6 N3=6N2, N5=3N4 N2+N3=N4+N5=constant N2+6N2=N4+3N4=C 7N2=4N4=C  Take C=28, then N2=4, N4=7  This is too small for a gear! Choose C=28x4=112 (say) • N2=16, N3=96, • N4=28, N5=84 3 2 6 N N        5 4 3 N N        Types of Gear trains Planetary or Epicyclic Gears Conventional gearset has one DOF If you remove the ground at gear 3, it has two DOF