Patent ID: 8961354
Filing Date: 2015-02-24
Classification: F16H,Y10S

Abstract:
1. A device comprising a first shaft (A), second shaft (B), and third shaft (C) each connected to a first differential gear train wherein each shaft rotates with speed ωA, ωB, and ωC, respectively, and wherein said first differential gear train is characterized by ratios p1 and q1 such that the relative rotational speeds of said three shafts are such that ωA=p1*ωB+q1*ωC; a means to control the rotational speed of said second shaft (ωB) relative to the rotational speed of said third shaft (ωC) to be a controlled ratio: ωB/ωC=n; said second shaft, said third shaft, and a fourth shaft (D) each connected to a second differential gear train, wherein said fourth shaft rotates with speed ωD and wherein said second differential gear train is characterized by ratios p2 and q2 such that the relative rotational speeds of shafts B, C, and D are such that p2*ωB+q2*ωC=ωD; wherein p1, q1, p2, and q2 can have each any non-zero, finite value; and wherein the ratio p1/q1 does not equal p2/q2.