Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1991-05-28
1993-04-27
Swinehart, Edwin L.
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
440 61, 440 79, B63H 512
Patent
active
052057640
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention generally relates to a marine propulsion system, generally referred to as a vessel or boat drive, for use in water vehicles having an inboard engine and of the type in which the drive system with the propeller shaft extends through the stern of the boat, substantially straight out therefrom and is enclosed in a drive body, and in which the propeller shaft has, at the outer end thereof, a propeller, preferably of the surface drive type, and in which the steering of the boat is done by operating the drive body itselt. The invention is more particularly concerned with a new type of steering mechanism for such a marine drive system.
BACKGROUND OF THE INVENTION
A boat drive of this type is known from U.S. Pat. No. 4,645,463 (H M Arneson) which patent discloses a structure in which the drive body is formed with a ball over which the drive is connected to the drive engine which is mounted inside the boat, and in which said ball is journalled in a ball carrier which is mounted at the stern of the boat, and in which the apparatus comprises two external hydraulic cylinders interconnecting the stern of the boat and a part of the drive for rotating the drive in the horizontal plane for the purpose of turning the boat, and in which there is an additional hydraulic cylinder for making it possible to trim (tilt) the drive by rotating the drive up or down in the vertical direction about the point of rotation of the said ball.
A boat drive of this type having a water surface driving propeller is highly advantageous as compared with the so called Z-drive types, and above all the drive causes less flow losses and less power losses depending on existing angle gear drives and transmission gear sets. Depending on the simple structure of the drive it is also cheaper to manufacture, more effective and apt to less wear and has less sources of error than many other types of boat propulsion drives.
The apparatus known from U.S. Pat. No. 4,645,463 indeed includes the advantages of a drive being a straight, surface water driving propulsion drive, but it is disadvantageous in that the ball and the ball carrier are subjected to strong stresses; in that certain plays may appear in the steering means thereof and in that the hydraulic cylinders for the trimming (tilting) and for the steering operations need to be serviced and maintained, are subjected to wear and are sensitive to ruptures and leakage in the hydraulic conduits, in particular since said parts are located on the exterior side of the boat, behind the stern of the boat. Normally there is also a need for long conduits and/or hoses from the propulsion drive at the outside of the boat to the maneuvre place inside the vessel or boat.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to suggest a propulsion drive for an inboard-outboard motor of the type in which the drive has a surface driving propeller which extends through the stern of the boat and substantially straight back therefrom, and in which the propulsion drive is formed
- so that the boat can be steered without the assistance of hydraulic cylinders or equivalent axial power motors placed on the exterior side of the boat,
- in which the propulsion drive has no actuation means at all provided on the exterior side of the boat whether for trimming the drive or for steering the boat,
- in which both the trimming and the steering of the drive is made by means of actuation means placed inside the complete drive structure and at the interior side of the boat or vessel hull,
- and which has an improved back driving capacity as compared with previously known systems of the same general type.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the invention will be evident from the following detailed description in which reference will be made to the accompanying drawings.
In the drawings FIG. 1 is a side view in a vertical cross section of an embodiment of a propulsion drive according to the invention. FIGS. 2a and 2b are in co
REFERENCES:
patent: 4358280 (1982-11-01), Jeanson et al.
patent: 4580517 (1986-04-01), Londberg
CPS Drive A/S
Swinehart Edwin L.
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