| 摘要 |
PURPOSE:To facilitat preparation of the compact captioned apparatus by cutting the top edge of the teeth part between the contiguous concaved parts of the sprocket wheels of an internal sun gear and a planetary gear and making the radius of the pitch circle large than the radius of the roller pitch of endless chains. CONSTITUTION:Double planetary gear mechanisms 7 and 8 are equipped with sprocket wheels 9 and 14, endless chain 10, planetary sprocket wheels 13 and 17, and equipped with the semicircular concaved parts for the engagement with chain rollers 9a, 14a, 13a, and 17a, and each top edge of the teeth parts 9b, 14b, 13b, and 17b between the contiguous concaved parts is cut on a pitch circle or the position in the vicinity. Further, the radius of the pitch circle of each fixed sprocket wheel 9, 14 is made larger than the radius provided by the roller pitch of the endless chains 10 and 15. Therefore, the high precision is not necessary in preparation aspect, and the smooth planetary movement is permitted. |
