| 摘要 |
PURPOSE:To maintain the ratio of rotations between inner and outer shafts constant even upon unbalance of the propeller load, by coupling the output shaft of main machine with an internal tooth gear, then coupling with a sun gear, while providing a planetary gear mechanism to be coupled through a carrier with an outer shaft in a planetary gear gearing with said internal tooth gear and sun gear. CONSTITUTION:A rotary driving force is transmitted from a main engine 1 through the output shaft 2 of the main engine and an inner gear 11 in a planetary gear mechanism 20 to a planetary gear 10. Furthermore, it is transmitted through a carrier 16 pivoted with said planetary gear 10 to an outer shaft 3 to drive rotation of a front side propeller 5 mounted on said outer shaft 3. While it is also transmitted through a sun gear 9 gearing with the planetary gear 10 to an inner shaft 4 to drive rotation of a rear side propeller 6 mounted on the inner shaft 4. The rotations of the outer shaft 3 or the output shaft 2 of the main machine and the internal tooth gear 11 of the planetary gear mechanism 20 are restricted by means of the first and second small gears 13, 12 gearing respectively with a large gear 14 and an external tooth 11a and a flexible shaft 15 to provide a constant rotary ratio.
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