Geared motor and geared motor series

A geared motor comprising a motor unit and a change gear unit for transmitting rotational power from said motor unit in combination, said change gear unit being arranged with its input shaft coaxial to a motor shaft of said motor unit, wherein:

• a simple planetary roller unit including a simple planetary roller mechanism and a casing for accommodating said simple planetary roller mechanism is interposed between said change gear unit and said motor unit, said simple planetary roller mechanism having a sun roller, a planetary roller retained by a carrier, and a ring roller, said planetary roller making rolling contact with the outer periphery of said sun roller and with the inner periphery of said ring roller;
• and
• flange portions spreading outward in the radial directions of said sun roller are formed on said casing for accommodating said simple planetary roller mechanism, at both ends in the axial direction of said sun roller, and one of said flange portions is coupled to a casing of said motor unit and the other is coupled to a casing of said change gear unit, and said geared motor is configured so that rotational power from said motor unit is coaxially transmitted to said change gear unit through said simple planetary roller unit.