TRANSMISSION MECHANISM
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United States of America Patent
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Issued Date -
Nov 16, 2017
app pub date -
Nov 26, 2015
filing date -
Dec 9, 2014
priority date (Note) -
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Abstract
A transmission mechanism has a set of two composite sprockets, each having pinion sprockets (210) supported movably in a radial direction with respect to a rotation shaft 1 that inputs or outputs power and a movement mechanism radially moving the pinion sprockets (210) in synchronization with each other while maintaining equidistance of the pinion sprocket (210) from a shaft center (C1) of the rotation shaft 1, and a chain wound around the two composite sprockets. Transmission ratio is changed by changing a circumcircle radius that is a radius of a circle encircling and circumscribing all the pinion sprockets (210). The pinion sprocket (210) is formed into a sector gear shape having a teeth portion (212) that is arranged along a circumference of a minimum radius circumcircle (A1) and meshes with the chain. With this configuration, torque can surely be transmitted.
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