Abstract
A pin wheel type reducer having no eccentric input cam has been newly developed. This reducer consists of an input disc with a trochoidal shape groove, a train of movable pins which are arranged to the equivalent angular pitch, a fixed cam and a reduction cam. The difference between the number of teeth on the fixed cam and the number of teeth on the reduction cam is two or more. And this difference conforms to the number of the trochoidal shape lobes on the input cam. The fixed and reduction cam are meshed with the train of pins simultaneously. In cases in which the input cam rotates, the meshing points on two cams rotate along the trocoidal shape. At the full rotation of input cam, the reduction cam rotates oppositely through the reduced angle which is proportional to the difference in the number of teeth. It can get high torsional rigidity and keep the balanced and steady rotation. In this report, the motion principle is investigated, and the cam profiles are shown based on motion of the pins. And the design conditions of an undercutting avoidance are investigated using polar complex vector analysis.
