Patent ID: 7044875
Filing Date: 2006-05-16
Classification: F01L,F02B,F16F,F16H,Y10T

Abstract:
1. A synchronous drive apparatus, comprising: a continuous-loop elongate drive structure having a plurality of engaging sections; a plurality of rotors comprising at least a first and a second rotor, the first rotor having a plurality of teeth for engaging the engaging sections of the elongate drive structure, and the second rotor having a plurality of teeth for engaging the engaging section of the elongate drive structure; a rotary load assembly coupled to the second rotor and presenting a periodic fluctuating load torque when driven in rotation; the elongate drive structure being engaged about the first and second rotors, the first rotor being arranged to drive the elongate drive structure and the second rotor being arranged to be driven by the elongate drive structure, defining a drive span of said elongate drive structure extending between said first rotor and said second rotor; one of the rotors having a non-circular profile having at least two protruding portions alternating with receding portions; wherein the magnitude of the eccentricity of the non-circular profile is such as to produce a periodic elongation and contraction of said drive span given by the formula: as