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    Requirements for non-interference

    In order that the planet gear teeth mesh properly with both the sun and ring gears, assuming equally spaced planet gears, the following equation must be satisfied:
    where
    are the nu… See more

    Gear speed ratios of conventional epicyclic gearing

    The gear ratio of an epicyclic gearing system is somewhat non-intuitive, particularly because there are several ways in which an input rotation can be converted into an output rotation. The four basic components of the epicy… See more

    Accelerations of standard epicyclic gearing

    From the above formulae, we can also derive the accelerations of the sun, ring and carrier, which are: See more

    Fixed carrier train ratio

    A convenient approach to determine the various speed ratios available in a planetary gear train begins by considering the speed ratio of the gear train when the carrier is held fixed. This is known as the fixed carrie… See more

    Gear ratio of reversed epicyclic gearing

    Some epicyclic gear trains employ two planetary gears which mesh with each other. One of these planets meshes with the sun gear, the other planet meshes with the ring gear. This results in different ratios being gene… See more

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