| 摘要 |
A marine jet propulsion system for a boat or the like comprises a power plant for rotating a drive shaft. A gear system is connected to the drive shaft and is configured to engage and rotate an impeller shaft. An impeller mounted to the impeller shaft is enclosed within a housing having a water inlet opening and a jet stream exit opening. The gear system includes a pinion gear connected to the drive shaft and engaging a pair of opposed ring gears, the ring gears being thus rotatable by the pinion gear in opposite directions. A clutch system is provided for selectively causing the impeller shaft to alternatively be engaged by one or the other of the ring gears and thereby selectively rotating the impeller in opposite directions. By this arrangement, rotation of the impeller in a first direction draws water through the housing in normal fashion to provide thrust at the exit opening, while rotation of the impeller in the opposite direction reverses the flow through the housing causing debris to be flushed out of the impeller or inlet opening. A simple control system allows the boat operator to perform the flushing process while occupying the control station of the boat.
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