| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary gear mechanism which attains a high gear ratio and miniaturization. SOLUTION: A planetary gear mechanism 1 includes: a housing H; an input shaft 2 which has an eccentric section 22 centered on an eccentric shaft and which is provided rotatably around the input/output axis to the housing H; a rocking surface plate 3 which eccentrically rocks to the input shaft 2 through the eccentric section 22 and rotates around the eccentric shaft; and an output shaft 7 on which a second internally toothed gear, which is internally meshed with a second externally toothed gear formed on the rocking surface plate 3, is mounted and provided rotatably around the input/output axis to the housing H. A first internally toothed gear, which is internally meshed with a first externally toothed gear formed on the rocking surface plate 3, is formed on the housing H. The circumferential position, at which the externally toothed gear and the internally toothed gear are meshed with each other, changes when the input shaft 2 rotates, and the rotational speed of the input shaft 2 is reduced and the rocking surface plate 3 is rotated, and the rotational speed is further reduced and extracted to the output shaft 7. COPYRIGHT: (C)2011,JPO&INPIT |
