Patent ID: 7232391
Filing Date: 2007-06-19
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; 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, and one of the rotors having a non-circular profile having at least two protruding portions alternating with receding portions, the rotary load assembly being such as to present a periodic fluctuating load torque when driven in rotation; wherein the angular positions of the protruding and receding portions of the non-circular profile relative to an angular position of the periodic fluctuating load torque present on the second rotor, and the magnitude of the eccentricity of the non-circular profile enables the rotor having the non-circular profile to apply to the second rotor an opposing fluctuating corrective torque which reduces or substantially cancels the fluctuating load torque of the rotary load assembly.