Support structure for planet gear in simple planetary gear mechanism and method for manufacturing the mechanism

A method for manufacturing a simple planetary gear mechanism comprising a sun gear, a planet gear, supported by a carrier pin supported by a carrier, circumscribing the sun gear, and an internal gear inscribed by the planet gear, including the steps of:

• incorporating the internal gear,
• incorporating the planet gear so that an axis center of the planet gear is eccentric with respect to an axis center of said carrier pin, the axis center of the planet gear being radially variable with respect to said simple planetary gear mechanism,
• selectively extracting a sun gear having a proper dimension from a plurality of sun gears having different dimensions, and
• incorporating the extracted sun gear into a central portion of said already incorporated planet gears while the eccentric situation of the axis center of the planet gear is being adjusted.

A support structure for a planet gear in a simple planetary gear mechanism, comprising

• a sun gear,
• a planet gear, circumscribing the sun gear,
• an internal gear inscribed by the planet gear, and
• a carrier pin supporting the planet gear and synchronizing with the planet gear's orbital motion, wherein
• said planet gear is assembled so that an axis center of the planet gear is eccentric with respect to an axis center of said carrier pin, said planet gear being radially variable with respect to said simple planetary gear mechanism.