Synchronous drive apparatus with non-circular drive elements

Details Synchronous drive apparatus with non-circular drive elements Synchronous drive apparatus with non-circular drive elements

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 35/02 (2006.01) F01L 1/02 (2006.01) F01L 1/356 (2006.01) F01L 1/46 (2006.01) F02B 67/06 (2006.01) F02B 75/06 (2006.01) F16F 15/10 (2006.01) F16F 15/26 (2006.01) F16H 7/00 (2006.01) F16H 7/02 (2006.01) F16H 9/24 (2006.01) F16H 57/00 (2006.01)

Patent

CA 2463715

A synchronous drive apparatus and method, wherein the apparatus comprises a plurality of rotors comprising at least a first and a second rotor. The first rotor (11) has a plurality of teeth (16) for engaging the engaging sections (15) of an elongate drive structure (10), and the second rotor (12) has a plurality of teeth (16) for engaging the engaging section of the elongate drive structure. A rotary load assembly (26) is coupled to the second rotor (12). The elongate drive structure (10) engages about the first and second rotors. The first rotor is arranged to drive the elongate drive structure and the second rotor is arranged to be driven by the elongate drive structure. One of the rotors has a non-circular profile (19) having at least two protruding portions alternating with receding portions. The rotary load assembly is such as to present a periodic fluctuating load torque when driven in rotation, in which the angular positions of the protruding and receding portions of the non- circular profile relative to the angular position of the second rotor, and the magnitude of the eccentricity of the non-circular profile, are such that the non-circular profile applies to the second rotor an opposing fluctuating corrective torque which reduces or substantially cancels the fluctuating load torque of the rotary load assembly.

L'invention concerne un procédé et un appareil de commande synchrone. L'appareil comprend une pluralité de rotors comprenant au moins un premier et un second rotor. Le premier rotor (11) comprend une pluralité de dents (16) qui s'engrènent dans les parties d'engrènement (15) d'une structure menante allongée (10). Le second rotor (12) comporte une pluralité de dents (16) qui s'engrènent dans les parties d'engrènement de la structure menante allongée. Un ensemble charge rotatif (26) est couplé au second rotor (12). La structure menante allongée (10) s'engrène sur les premier et second rotors. Le premier rotor est conçu pour entraîner la structure menante allongée, le second pour être mené par cette même structure. Un des rotors présente un profil non circulaire (19) doté d'au moins deux parties saillantes alternées avec des parties en creux. Lorsqu'il est entraîné en rotation, l'ensemble charge rotatif présente un couple de charge à fluctuation périodique. De plus, les positions angulaires des parties saillantes et en creux du profil non circulaire par rapport à la position angulaire du second rotor, ainsi que l'amplitude de l'excentricité du profil non circulaire sont telles que le profil non circulaire exerce sur le second rotor un couple de correction à fluctuation opposée, ce qui atténue ou supprime quasiment le couple de charge variable de l'ensemble charge rotatif.

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