| 摘要 |
<p>PURPOSE:To enable the sailing to be continuously performed even in an emergency, by providing a power cutoff means between input and distribution output ends of a power distributing means, which distributively transmits power to a double contrarotating shaft, further forming at least one of the propellers to be driven in a variable pitch. CONSTITUTION:A power distributing means 10 distributively transmits input power respectively to an outer rotary shaft 4 of a double contrarotating shaft 3 and its inner rotary shaft 6, and between an input end 10c and distribution output ends 10a, 10b of said means 10, a power cutoff means 19 is provided to cut transmission of the power to either rotary shaft. In this way, secured seizure of a bearing 5 is generated, and even if the rotary shafts come to be unable to contrarotate to each other, the transmission of the power is continued by driving the other rotary shaft to be rotated. Further, of the pair of propellers 1, 2, which are constituted mutually in a reverse pitch generating propulsive force in the same direction being mutually reversed when the double contrarotating shaft 3 is normally driven, the propeller 1, if it provides a variable pitch mechanism 23, changes a pitch when the inner and outer rotary shafts are rotated in the same direction in an emergency, and propulsive force can be generated by the propellers 1, 2.</p> |
