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EP0648670A1 - Antriebssystem - Google Patents

Antriebssystem Download PDF

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Publication number
EP0648670A1
EP0648670A1 EP94850180A EP94850180A EP0648670A1 EP 0648670 A1 EP0648670 A1 EP 0648670A1 EP 94850180 A EP94850180 A EP 94850180A EP 94850180 A EP94850180 A EP 94850180A EP 0648670 A1 EP0648670 A1 EP 0648670A1
Authority
EP
European Patent Office
Prior art keywords
propeller
rudder
hood
propulsion system
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94850180A
Other languages
English (en)
French (fr)
Other versions
EP0648670B1 (de
Inventor
Leif Magnus Endresen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Servogear AS
Original Assignee
Servogear AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Servogear AS filed Critical Servogear AS
Publication of EP0648670A1 publication Critical patent/EP0648670A1/de
Application granted granted Critical
Publication of EP0648670B1 publication Critical patent/EP0648670B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/06—Steering by rudders
    • B63H25/38—Rudders

Definitions

  • the present invention relates to a propulsion system, particularly for high-speed boats, consisting of a propeller having a propeller hood positioned downstream relative to the propeller blades, and a rudder.
  • the present invention is particularly suitable for use in connection with a propulsion system wherein an inclined propeller shaft is employed. This should not, however, be seen as a limitation to the application of the invention.
  • propeller shaft 1 is suspended in a bracket 2, and the propeller itself 3 terminates in a propeller hood 4.
  • Propeller shaft 1 is angled relative to the boat hull 5 at an angle of ⁇ relative to the structural water line 6 of the boat.
  • the boat rudder 7, as shown on Figure 1, is positioned downstream in relation to both the propeller blades 3 and the actual propeller hood 4.
  • Rudder 7 has a streamlined configuration, i.e., having an outwardly curved surface on each side thereof.
  • the present invention therefore aims to reduce or eliminate the suction behind the propeller hood, at the same time as it seeks to improve the rudder effect with respect to recovery of rotational loss behind the propeller.
  • the propulsion system mentioned in the introduction above is characterized in that the propeller hood extends entirely or partially along the lower edge of the rudder, and that the rudder has approximately the same cross section as an airfoil or aircraft wing.
  • the propeller hood is shaped like a cone.
  • the propeller hood may be designed as a rotating body the generatrix of which forms a curve.
  • Figure 1 is a view of a propulsion system according to the prior art.
  • Figure 2 is a view of section II-II in Figure 1.
  • Figure 3 is an elevational end view of section III in Figure 1.
  • Figure 4 is a side view of the propulsion system in accordance with the present invention.
  • Figure 5 is a view of section V-V in Figure 4.
  • Figure 6 is an elevational view of section VI in Figure 1.
  • FIG. 4 illustrates the way propeller shaft 1 extends from a sleeve bearing 8 in the hull 5, similarly to what is also shown in Figure 1.
  • propeller shaft 1 is mounted in a propeller bracket or sleeve bearing 2 in the same manner as illustrated in connection with Figure 1.
  • the propeller is designated with reference numeral 3.
  • the actual propeller hood, according to the invention, is preferably cone shaped, and is indicated by reference numeral 4'in Figures 4 and 5.
  • the rudder extending downward from boat hull 5 is indicated by reference numeral 7. This rudder is specially designed to have the approximate cross section of an airfoil or aircraft wing, imparting rudder 7' with a pressure side 8 and a suction side 9.
  • propeller hood 4' extends completely or partially along the lower edge of rudder 7'.
  • the rudder will have approximately the same cross section as an aircraft wing or airfoil.
  • the slip stream produced behind the propeller will rotate in the same rotational direction as the propeller, as shown inter alia by Figure 6. This will in turn cause the water stream to impact rudder 7' at a slant.
  • the rudder thus acquires a pressure side 8 and a suction side 9 when set at its center position, as shown in Figures 5 and 6.
  • the overpressure on the one side may be increased if the rudder is designed as shown, i.e., like an airfoil or aircraft wing. This pressure will be transmitted down to propeller hood 4'.
  • the circulation around the propeller hood will have the opposite direction of rotation as the slip stream behind the propeller. This will have the result of counteracting turbulence, thereby decreasing the power loss. Propeller 3 will thereby achieve a greater thrusting power, which may be utilized to attain higher speed or a lower power consumption.
  • the forces generated against the rudder could be equalized by having a propeller rotating in the opposite direction on twin-propeller boats, or by rotating the rudder sections above the propeller, thus counterbalancing the steering forces on boats having one propeller.
  • the present propulsion system has proven during testing that it is possible to achieve power gains of a magnitude of between 10% and 15% compared with the known art, cf. Figures 1-3.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Control Of Position Or Direction (AREA)
  • Control Of Linear Motors (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Valve Device For Special Equipments (AREA)
  • Transmission Devices (AREA)
  • Vehicle Body Suspensions (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP94850180A 1993-10-18 1994-10-14 Antriebssystem Expired - Lifetime EP0648670B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO933744 1993-10-18
NO933744A NO178103C (no) 1993-10-18 1993-10-18 Propulsjonssystem

Publications (2)

Publication Number Publication Date
EP0648670A1 true EP0648670A1 (de) 1995-04-19
EP0648670B1 EP0648670B1 (de) 1998-01-14

Family

ID=19896512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94850180A Expired - Lifetime EP0648670B1 (de) 1993-10-18 1994-10-14 Antriebssystem

Country Status (5)

Country Link
EP (1) EP0648670B1 (de)
AT (1) ATE162146T1 (de)
AU (1) AU7591294A (de)
DE (1) DE69407918D1 (de)
NO (1) NO178103C (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191002182A (en) * 1910-01-28 1910-12-31 William Henry Fauber Improvements in Rudders and Propeller Shaft Brackets.
GB293351A (en) * 1927-07-04 1929-06-13 Star Contrapropeller Ltd As An arrangement of guide vanes in single-screw ships
US2064463A (en) * 1933-03-18 1936-12-15 Crosley Radio Corp Motor boat and driving unit therefor
FR1549826A (de) * 1967-12-26 1968-12-13
FR2281269A1 (fr) * 1974-08-08 1976-03-05 Schottel Werft Installation d'une helice de navire
GB2008520A (en) * 1977-11-28 1979-06-06 Skf Nova Ab Propellers shrouds

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191002182A (en) * 1910-01-28 1910-12-31 William Henry Fauber Improvements in Rudders and Propeller Shaft Brackets.
GB293351A (en) * 1927-07-04 1929-06-13 Star Contrapropeller Ltd As An arrangement of guide vanes in single-screw ships
US2064463A (en) * 1933-03-18 1936-12-15 Crosley Radio Corp Motor boat and driving unit therefor
FR1549826A (de) * 1967-12-26 1968-12-13
FR2281269A1 (fr) * 1974-08-08 1976-03-05 Schottel Werft Installation d'une helice de navire
GB2008520A (en) * 1977-11-28 1979-06-06 Skf Nova Ab Propellers shrouds

Also Published As

Publication number Publication date
NO933744D0 (no) 1993-10-18
EP0648670B1 (de) 1998-01-14
DE69407918D1 (de) 1998-02-19
NO178103B (no) 1995-10-16
AU7591294A (en) 1995-05-04
ATE162146T1 (de) 1998-01-15
NO178103C (no) 1996-01-24
NO933744L (no) 1995-04-19

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