| 摘要 |
PURPOSE:To allow a medium-speed and large-horsepower Diesel engine to be emplyed as a main engine and allow high-speed rotation without increasing the propeller diameter by inserting an acceleration reversing unit between the inboard main engine and an outdrive unit. CONSTITUTION:The output of a main engine 1 drives a propeller 37 through an acceleration reversing unit 8, a connecting shaft 3, and an outdrive unit 2; and the ship is moved ahead or astern by the operation of the ahead/astern transfer valve 47 of the acceleration reversing unit 8. Thereby, a medium-speed and large-horsepower Diesel engine can be employed as the main engine 1, the output can be effectively utilized by high-speed rotation without increasing the diameter of the propeller 37 more than it is necessary, and the propelling efficiency is improved. In addition, the propeller diameter can be kept small, thus the lower bulge of a lower unit 2b is decreased even if a cavitation plate 38 is provided at an optimum position, thus allowing complete tilt-up. |
