| 摘要 |
<p>PURPOSE:To make it possible to eliminate a continuous use prohibition area from an engine operation range by arranging a clutch between an input end of a power distribution means and a distribution output end in order to change a mass of a vibration train by disengaging either an inner or outer shaft from a main shaft. CONSTITUTION:When performing a normal navigation by rotating paired propellers 2 and 3 in directions reverse to each other, a control device 30 engages a clutch 21 and transmits engine power to both inner and outer shafts 6 and 5 by means of a power distribution means 17. Here, if an engine rpm is lowered to a certain rpm in order to slow a speed of a ship down, a peak of vibration torque is produced. The control device 30 therefore, detects that an rpm at which the peak of the vibration torque is produced is drawing near by means of a detector 31, disengages the clutch 21, disengages a bow side propeller 2 located after a planetary gear mechanism 20 from an engine 11, reduces a mass of a vibration train, and makes the peak of the vibration torque move to a higher rpm side. Thus, it is possible to eliminate a continuous use prohibition area from an engine operation range to improve maneuverability of a ship.</p> |
