| 摘要 |
A reduction device having a reverse rotation preventing function is disclosed. The reduction device comprises: a case having a pair of case parts assembled with each other to define a receiving space; a fixed ring gear coupled between and to the pair of case parts and having a first internal gear part; an output member rotatably received in the receiving space of the case and having an output ring gear and an output shaft, the output ring gear having a second internal gear part, the output shaft being formed on a bottom wall of the output member; a carrier received in the receiving space of the case and having one end rotatably supported by the bottom wall of the output member and the other end being formed with an input shaft, the carrier further having a pair of circular plates which define a receiving room therebetween; and a plurality of double planetary gears received in the receiving room of the carrier and rotatably secured to the pair of circular plates, each of the double planetary gears having a first planetary gear part which is meshed with the first internal gear part of the fixed ring gear and a second planetary gear part which is meshed with the second internal gear part of the output member, the first and second planetary gear parts of each double planetary gear being integrally formed with each other.
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