TRANSMISSION MECHANISM
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United States of America Patent
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Dec 8, 2015
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Dec 9, 2014
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Abstract
Transmission mechanism has set of two composite sprockets (5, 5), each having pinion sprockets (20) supported movably in radial direction with respect to rotation shaft (1) inputting or outputting power and movement mechanism radially moving pinion sprockets (20) in synchronization with each other while maintaining equidistance of pinion sprocket (20) from shaft center (C1) of rotation shaft (1), and chain (6) wound around two composite sprockets. Transmission ratio is changed by changing circumcircle radius that is radius of circle encircling and circumscribing all the pinion sprockets (20). Each guide rod (29) has first guide rod (291) guiding chain (6) all the time regardless of circumcircle radius size, and second guide rod (292) guiding chain (6) at least when circumcircle radius is a maximum and positioned at radial direction inner side with respect to first guide rod (291) when circumcircle radius is a minimum. With this, ratio coverage can be expanded.
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