Patent ID: 9176453
Filing Date: 2015-11-03
Classification: F16H,G03G

Abstract:
1. A reduction gear unit, comprising: a casing; and a plurality of planetary gear mechanisms arranged in series in an axial direction thereof within the casing, each of the planetary gear mechanisms including: an extreme upstream planetary gear mechanism of the plurality of planetary gear mechanisms in a drive transmission direction including an input element connected to a drive source, an extreme downstream planetary gear mechanism of the plurality of planetary gear mechanisms in the drive transmission direction including an output element connected to a member to output the drive force to a rotary member, any planetary gear mechanism of the plurality of planetary gear mechanisms other than the extreme downstream planetary gear mechanism including an output element connected to an input element of an adjacent planetary gear mechanism located downstream of any planetary gear mechanism in the drive transmission direction, the sun gear of the extreme downstream planetary gear mechanism in the drive transmission direction having a larger pitch diameter than the sun gear of any other planetary gear mechanism, and the output element of the extreme downstream planetary gear mechanism is fixed to the carrier of the extreme downstream planetary gear mechanism, and the output element is rotatably unsupported by an axial end cap of the casing so that the carrier of the extreme downstream planetary gear mechanism is floatingly supported in the casing.