Apparatus for increasing the rearward propulsion of boat motors provided with reverse gears
OwnerFritz-Johann Finzeinventor
Life of this patent
Estimating the term…
Abstract
The invention relates to an accessory for outboard motors, Z-drives for boats or the like, the exhaust gas of which is normally conducted through the propeller hub into the water. By means of a valve system, which is suitably automatically changed over by the direction of rotation of the propeller, the exhaust gas, during rearward rotation of the propeller, is conducted to a region which lies outside the propeller suction, while the exhaust gas, during forward rotation of the propeller, flows out in the usual manner through the propeller hub. The success of the invention lies in a significant increase of the propeller propulsion during rearward travel.
Claims25
Apparatus for increasing the rearward propulsion of boat motors provided with reverse gears, an exhaust system, and a propeller having a hub, in which an axially directed exhaust passage extends through the propeller hub and in which the exhaust system has an equalization opening disposed outside the vicinity of the propeller hub, said apparatus further including a valve means disposed within said exhaust passage and being movable between a closed position, in which exhaust gas flow through said passage is interrupted and an open position, in which at least a substantial part of the cross-section of the exhaust passage is opened, and further including means independent of said propeller and said hub and operably connected directly to said valve means for selectively opening and closing said valve means responsive to a changing of direction of rotation of the propeller, said opening and closing means being disposed in a position exposing same to water adjacent said hub.
In apparatus for increasing rearward propulsion of a marine drive unit through ambient water, including a housing, a motor, an exhaust system, forward and reverse gears, a propeller drive shaft and a propeller having a hub, wherein said exhaust system includes an equalization opening spaced from said propeller hub, and an exhaust passage in said hub having a rearwardly disposed outlet with respect to a forward direction of motion of said drive unit, and valve means disposed within said exhaust passage and movable between an open position, passing exhaust from said outlet, and a closed position, blocking said outlet, an improvement in said apparatus including:
- drive means connected to said valve means and independent of said propeller and of said hub for selectively driving said valve means between said open and closed positions.
In apparatus for controlling exhaust flow from a marine propulsion unit having an engine, a propeller drive shaft connected thereto, a propeller and propeller hub mounted on said drive shaft, an exhaust flow system including an exhaust outlet passage in said hub, and means for driving the drive shaft and propeller in opposite directions of rotation for forward and rearward motion through ambient water, the improvement including:
- valve means disposed within said hub for selectively blocking and opening said exhaust outlet passage in response to the direction of rotation of said propeller and hub, and
- valve operating means independent of and movable with respect to said propeller for opening and closing said valve means in response to direction of rotation of said propeller.
Dependencies are inferred from the claim text.