Gear transmission
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United States of America Patent
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Oct 1, 2013
Grant Date -
Mar 4, 2010
app pub date -
Dec 12, 2007
filing date -
Dec 21, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An external gear has a number of teeth differing from a number of teeth of an internal gear, and is maintaining in a meshing state with the internal gear. A center through hole and an offset through hole are formed in the external gear. The center through hole is formed at the center of the external gear, whereas the offset through hole is formed at a position offset from the center of the external gear. Column-shaped member of a carrier passes through the offset through hole. A pair of supporting members of the carrier respectively supports each end of the column-shaped member. A pair of grooves is formed on a surface of a shaft of a crank member at positions between which an eccentric rotation member of the crank member is interleaved. First rolling elements and first outer races are arranged between the supporting members and the grooves. The shaft of the crank member is supported so as to be capable of rotating with respect to the carrier and incapable of moving in its axial direction.
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