| 摘要 |
PURPOSE:To improve propulsive efficiency in a way of reducing any turbulence in a propeller and the occurrence of air bubbles by preventing a separation phenomenon of flowing in a gear case amid a speedy flow by an outboard motor and restraining any cavitation from occurring, in regard to a cavitation preventer of this outboard motor propelling a boat at high speed. CONSTITUTION:A gear case 5 is installed in a drive shaft housing equipped with a cooling water feed pump 11, and a main feed water port 10 is installed in a drum part 5b of this gear case 5, while a straightening port 20 is installed in this drum part 5b in the rearward of this main feed water port 10 after being interconnected to both sides of this drum part 5b. In this constitution, this cavitation preventer is one provided with a feed water passage 21 of the cooling water feed pump 11 so as to interconnect the main feed water port 10 and the straightening port 20. |
