EP1107906A1 - Device for propulsion of a boat - Google Patents
Device for propulsion of a boatInfo
- Publication number
- EP1107906A1 EP1107906A1 EP99953660A EP99953660A EP1107906A1 EP 1107906 A1 EP1107906 A1 EP 1107906A1 EP 99953660 A EP99953660 A EP 99953660A EP 99953660 A EP99953660 A EP 99953660A EP 1107906 A1 EP1107906 A1 EP 1107906A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- propeller
- end segment
- gear housing
- attachment element
- contour
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
- B63H20/32—Housings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
- B63H20/32—Housings
- B63H2020/323—Gear cases
Definitions
- the invention relates to a device for driving a boat, which has a propeller and a gear housing, and in which the gear housing is provided with a rounded tapered end segment.
- the gear housing between the open end, the propeller side, and the tapered part, the gear nose are cylindrical.
- the construction of the gear lugs tends between a course corresponding to a parabola, a hemisphere, a design of the letter Delta or an arc with a common intersection, the crescent design.
- the inflowing water is more or less dispersed by such gear lugs, since more water is displaced than the gear housing on the tread surface offers.
- the gear Due to their geometry, noses force the inflowing water to change its direction excessively, which leads to a poor drag coefficient. The result is increased water resistance and the problem of so-called breakaway occurs at higher speeds.
- the propeller draws air from the water surface, which cannot be prevented by an anti-ventilation plate over the propeller.
- the engine may even overheat because the cooling water openings can no longer be flushed with enough water.
- the drive must be mounted lower than necessary, which in turn leads to increased overall resistance.
- edges of the underwater part below and above the gear housing used in the prior art are likewise disadvantageous, since they end with a blunt or circular rounded shape in all available makes.
- An approximately 2 - 3 mm wide edge remains. Multiplying this width by the height of the entire leading edge results in an area of up to 12 qcm. Such tread area increases the water resistance and swirls the water in the inflow area of the propeller.
- the object of the present invention is to construct a device of the type mentioned in the introduction in such a way that improved efficiency is achieved.
- this object is achieved in that the end segment has, at least in some areas, a course of an outer contour corresponding to the course of a parabola or an ellipse.
- the boat starts to glide around 6 km / h at about 500 to 600 rpm. less engine speed compared to the sliding limit, with conventional equipment. This is partly due to the fact that the rear is no longer pulled down due to increased water resistance in the drive.
- a compact and short design is supported in that the end segment is formed from a gear cap and an attachment element.
- attachment element extends steeper from the gear cap than the gear cap before a transition into the attachment element.
- Particularly favorable inflow angles can also be achieved in that the outer contour of the attachment element is delimited by tapered parabolic segments.
- a low flow resistance can be achieved in that the end segment is limited at least in some areas in the form of a parabola that is brought to an end.
- the end segment is delimited at least in regions in the form of a continuous ellipse.
- a further reduction in the overall dimensions can be achieved in that the end segment has a multistage course of its surface contour with angular transitions of the individual surface segments relative to one another.
- the gear housing be arranged in the region of an underwater part which has at least in some areas a parabolic or elliptically contoured leading edge.
- a structurally simple and fluid dynamically effective measure is achieved in that the elliptically or parabolically contoured leading edge extends in the vertical direction above the gear housing.
- the elliptically or parabolically contoured leading edge extends in the vertical direction below the gear housing.
- the propeller be rich of propeller blades is provided with leading edges, which are designed in the area from an apex line to a vacuum side without a quarter arch.
- the propeller blades of the propeller have leading edges, at least in some areas, with a contour which is formed from elliptically contoured segments which are stepped into one another.
- FIG. 2 shows a basic illustration of a gearbox housing with a gearbox cap which is transferred in steps to an attachment element which has an outer contour profile corresponding to a parabola segment
- Fig. 1 shows an embodiment in which a gear housing (1) is formed from a base segment (2) and a tapered end segment (3). Starting from the base segment (2), the end segment (3) tapers essentially parabolically.
- Fig. 2 shows an embodiment in which the end segment (3) is formed from a gear cap (4) opening into the base segment (2) and an attachment element (5) carried by the gear cap (4).
- a base area (6) of the attachment element (5) can have a circular contour. Starting from this base area (6), the attachment element (5) extends with a contour shape corresponding to a parabolic segment. In the area of its extension facing away from the base area (6), the attachment element (5) can taper to a point.
- the course of the outer contour of the attachment element begins (5) at a right angle relative to the base (6).
- a transition of the attachment element (5) to the gear cap (4) preferably takes place discontinuously in the area of an angle attachment (7).
- the base segment (2) typically extends essentially in a cylindrical shape and coaxially with a center line (8).
- the gear housing (1) is preferably used in the area of outboard motors or sterndrives for boats. With a correspondingly large dimensioning, use in connection with ship drives is also possible.
- the attachment element (6) preferably begins in that area of the gear cap (4) in which a shape of the outer contour of the gear cap (4) begins to deviate significantly from the shape of a parabola or a continuous ellipse.
- This geometrical design enables an essentially parallel flow to the center line (8) to flow onto the course of the gear cap (4) adjoining the attachment element (5).
- the incoming water does not experience an excessive change in direction due to this construction. Blowing up.
- the entire gear housing (1) is rather very close to flow and turbulence is avoided.
- a propeller (not shown) which adjoins the end of the base segment (5) facing away from the gear cap (4) is thereby better flowed against and it is almost impossible to break loose.
- the water resistance on the tread surface of the gear housing (1) is reduced.
- the gear cap (4) it is also conceivable for the gear cap (4) to run in such a way that, starting from the base segment (2), there is initially a parabolic or elliptical design, the attachment element (5) in that area of this gear cap (4) to position where, according to the prior art, it runs increasingly bluntly and merges into an approximately circular-arc-shaped contour design.
- the attachment element (5) has a course of the surface contour such that an end of the attachment element (5) facing away from the base area (6) is positioned in a region which corresponds to a theoretical end point of a parabolic or elliptical surface design of the gear cap ( 4) would correspond. An extension of the gear cap (4) is thus carried out.
- Fig. 3 shows a side view of a typical design of an underwater part (9) of a drive.
- the underwater part (9) consists of a mounting plate (10), which is followed by a spacer plate (11) for fixing the gear housing (1).
- a sword-like flow guiding element (12) is arranged in the area of the boundary of the gear housing (1) facing away from the spacer plate (11).
- a drive shaft (13) for the propeller is led out of the area of the part of the gear housing (1) facing away from the end segment (3).
- a flow toward the underwater part (9) is characterized in FIG. 3 by flow arrows.
- a leading edge (14) of the underwater part (9) is also preferably designed with a parabolic or elliptical contour. Such a design is implemented both in the area of the spacer plate (11) and in the area of the flow guide element (12).
- Fig. 4 shows a typical contour profile for the underwater part (9) in a horizontal section.
- the leading edge (14) shows both the proposed parabolic profile and, to facilitate comparison with the prior art, a conventional contour profile on the outside.
- a blunt termination is realized in the area of a trailing edge (15).
- the proposed design makes it possible to remove a radiation ring which may be present in the area of the propeller. Due to the improved flow behavior in the area of the underwater part (9) and the gear housing (1), turbulence is avoided while driving, so that no exhaust gases can flow back into the propeller. By eliminating the radiation ring, the overall diameter of the unit consisting of the propeller hub and gear housing (1) is reduced and at the same time the flow resistance of the reduced tread area is reduced again.
- Fig. 5 shows a propeller (16) with propeller blades (17).
- the propeller blades (17) have a design in the area of the leading edges (18) in such a way that water can no longer be displaced into the vacuum region by the rotary movement of the propellers (16).
- a corresponding design of the leading edge (18) can be carried out by removing the quarter bend from the apex line of the leading edges (18) to the negative pressure side.
- the quarter arches of the leading edges (18) remaining by appropriate design are provided with an elliptical contour profile as shown in FIG. 6.
- the stability of the propeller (16) is not affected by this measure.
- propellers (16) of larger dimensions are designed, for example for displacement travel or commercial shipping, there is a slight slope in relation to the diameter. It is therefore expedient to provide such propellers (16) with a stronger profile in the area of the leading edges (18). As a result, the sides of the leading edges (18) displacing into the vacuum region can be omitted.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Toys (AREA)
- Exhaust Silencers (AREA)
- General Details Of Gearings (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Vehicle Body Suspensions (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Discharge Heating (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Magnetic Heads (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998140339 DE19840339A1 (en) | 1998-09-04 | 1998-09-04 | Propeller for outboard motor of boat, ground so that no water can be forced by rotary motion into low pressure region |
DE19840340 | 1998-09-04 | ||
DE19840339 | 1998-09-04 | ||
DE19840340A DE19840340A1 (en) | 1998-09-04 | 1998-09-04 | Propeller-operated boat drive, particularly in underwater areas with outboard or Z-drive, works with alterations in inflow and outflow areas |
PCT/DE1999/002747 WO2000013966A1 (en) | 1998-09-04 | 1999-08-27 | Device for propulsion of a boat |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1107906A1 true EP1107906A1 (en) | 2001-06-20 |
EP1107906B1 EP1107906B1 (en) | 2003-08-27 |
Family
ID=26048619
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99953660A Expired - Lifetime EP1107906B1 (en) | 1998-09-04 | 1999-08-27 | Device for propulsion of a boat |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1107906B1 (en) |
AT (1) | ATE248100T1 (en) |
AU (1) | AU1030000A (en) |
DE (1) | DE59906792D1 (en) |
WO (1) | WO2000013966A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2737920A (en) * | 1953-05-11 | 1956-03-13 | Watson Flagg Machine Company | Drive for depth regulated propeller mounting |
US3654889A (en) * | 1970-09-28 | 1972-04-11 | Volvo Penta Ab | Hydraulic system for a boat drive |
US4068979A (en) * | 1973-07-26 | 1978-01-17 | Nikolai Sergeevich Vysokorodov | Marine propulsive device |
US3972646A (en) * | 1974-04-12 | 1976-08-03 | Bolt Beranek And Newman, Inc. | Propeller blade structures and methods particularly adapted for marine ducted reversible thrusters and the like for minimizing cavitation and related noise |
US4343612A (en) * | 1980-06-11 | 1982-08-10 | Outboard Marine Corporation | Outboard motor including a two speed transmission |
DE3835213A1 (en) * | 1988-10-15 | 1990-05-10 | Schiffer Dietrich F W | Wing construction for energy transmission in the media of water and gas, and for a vehicle for movement on land or water and in the air |
US4931026A (en) * | 1989-04-24 | 1990-06-05 | Woodland Sylvester L | Jet propeller |
AU1634992A (en) * | 1991-08-01 | 1993-02-04 | B.F. Goodrich Company, The | Composite and fairwater structures for marine vessels |
US5376027A (en) * | 1994-03-21 | 1994-12-27 | Hergenrather; Joseph J. | Marine propulsion mechanism for water craft |
GB9416481D0 (en) * | 1994-08-16 | 1994-10-12 | Wills Anthony A | Three dimensional objects |
-
1999
- 1999-08-27 WO PCT/DE1999/002747 patent/WO2000013966A1/en active IP Right Grant
- 1999-08-27 EP EP99953660A patent/EP1107906B1/en not_active Expired - Lifetime
- 1999-08-27 DE DE59906792T patent/DE59906792D1/en not_active Expired - Fee Related
- 1999-08-27 AT AT99953660T patent/ATE248100T1/en not_active IP Right Cessation
- 1999-08-27 AU AU10300/00A patent/AU1030000A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO0013966A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000013966A1 (en) | 2000-03-16 |
AU1030000A (en) | 2000-03-27 |
EP1107906B1 (en) | 2003-08-27 |
ATE248100T1 (en) | 2003-09-15 |
DE59906792D1 (en) | 2003-10-02 |
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