Marine propulsion – Screw propeller – Having means to control flow around propeller
Patent
1997-04-14
1998-11-17
Basinger, Sherman
Marine propulsion
Screw propeller
Having means to control flow around propeller
440 67, 114151, B63H 118
Patent
active
058367950
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention pertains to a watercraft drive with a driving engine and a double rudder propeller, which is driven by the driving engine through driving shafts, angular gear and output transmission shafts, and the propellers are connected to the output shafts in a manner adapted to rotate in unison.
In another previously known propeller arrangement for the drive of a watercraft, two horizontal propeller shafts are arranged at the lower end of a vertical driving shaft or two vertical driving shafts, which are surrounded by a housing tube, with insertion of an angular gear drive, and each one of two propellers is arranged to rotate in unison at the ends of the propeller shafts, which face away from the angular gear drive. The angular gear drive is designed such that an angular gear of the angular gear drive is arranged between a lower shaft end or the lower vertical shaft ends of the vertical shafts or the lower vertical shafts and each of the horizontal shafts. The two propeller shafts, which are output transmission shafts at the same time, are arranged on one side of this drive housing, or one of the propeller shafts is arranged on each side of the drive housing and is led out of the drive housing correspondingly. If both propeller shafts and thus both propellers are arranged on one side of the drive housing, then one of these shafts surrounds the other concentrically like a hollow shaft. The two propellers have different designs, especially in the respect that the direction of rotation and the diameter of the propellers, but also probably the number of blades, are different at any rate (GB 2 190 344).
Finally, another state of the art (German Patent DE 35 08 203) deals with an embodiment of a guiding device for a watercraft drive, which is equipped with a propeller, to increase the thrust or to reduce the consumption of fuel and therefore affects the present invention, at the most, in features that practically embody the present invention
A watercraft drive of this type is known from DE 870 655. The output of the driving engine, arranged inside the hull, is introduced into a vertically arranged driving shaft, the lower end of which is guided through the bottom of the watercraft towards the outside of the hull, drives horizontally arranged output shafts via an angular gear there, each of which has a propeller that is utilized for the propulsion of the watercraft at each end facing away from the angular gear. It is also possible to design such an arrangement as a rudder propeller, in that not only is the drive output introduced at the upper end of the vertically arranged shaft, but an actuator may also be activated, so that a jacket tube, which surrounds the drive shaft concentrically, is pivotable by up to 360.degree. or all around the longitudinal axis of the driving shaft. If the actuator is activated, then the propellers are ultimately pivoted about the longitudinal axis of the driving shaft and not only is the output of the driving engine converted to thrust power, but it is possible to use the drive output for maneuvering the watercraft by means of pivoting the underwater part of the drive system by 360.degree. as well. In the prior-art device, an angular gear and an output shaft are assigned to each propeller. Thus, both propellers can be driven independently of one another. However, the technical cost of this drive is not in proportion to the benefit that can be achieved from the separate operation of the two propellers.
SUMMARY OF THE INVENTION
The basic object of the present invention is to develop a watercraft drive of the type mentioned in the introduction, which has a simple design in terms of production technology, while contributing a high efficiency.
The object is accomplished with the features of claim 1 according to the present invention.
Here, both propellers are operated in a functionally identical manner with only one angular gear and one line of driving shafts. Thus, a drive, with which the structural volume is also markedly reduced, is created, w
REFERENCES:
patent: 3127865 (1964-04-01), Pleuger
patent: 4074652 (1978-02-01), Jackson
Kaul Stefan
Reuter Reinhold
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