| 摘要 |
A device for increasing the efficiency of operation of an internal combustion engine used in outboard and inboard/outboard motors comprised of a generally cylindrical member having inner and outer peripheral shell members defining a cylindrical annular space therebetween, wherein are located a plurality of turbine vanes spanning the annular volume between said inner and outer shell members. Said inner and outer shell members and said plurality of vanes are drivingly connected to the propeller shaft of an outboard motor and are mounted coaxially with said propeller shaft. The device is located in the forward end of the inner propeller hub and rotatably mounted in association with the lower unit of said outboard or inboard/outboard motor so that exhaust gases flowing through said lower unit pass through said annular volume. Upon rotation of said propeller shaft, said plurality of vanes are caused to rotate at the same angular velocity thereof. Said vanes are configured in such a way so that the exhaust gases are caused to be moved through said lower unit at an elevated velocity thereby causing a decrease in pressure between the lower unit and the exhaust port of the combustion chambers. Exhaust gases are thereafter expelled from the rear of the propeller unit. The decrease in pressure at the exhaust ports causes the engine operation to be more efficient due to the decrease in work required by the piston or pistons to expel exhaust gases therefrom.
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