NL1035070C2 - Outboard engine for attaching to folding stern of vessel i.e. ship, has engine nacelle suspended between two shafts, where nacelle includes propeller that is mounted such that propeller protrudes behind shafts - Google Patents

Abstract

The engine (1) has electronics housed in an upper part (2) with a tiller (3), and two elongated vertical down-parallel shafts (4) attached to the tiller, where the parallel shafts serve as a rudder. The shafts are mounted at some distance from each other, where the thickness of the shafts is approximately 10 percent of the width in the running direction. An engine nacelle (5) is suspended between the two shafts, where the nacelle includes a propeller (6) that is mounted such that the propeller protrudes behind the shafts.

Description

-1-

Electrically driven outboard motor

The invention relates to an electrically driven outboard motor, wherein the motor nacelle is attached at the bottom to two elongated vertical tail pieces which serve as a rudder, the motor nacelle also being provided on the underside with a vertically downwardly directed fin and the screw behind the tailpieces. The entire device is rotatable about an imaginary vertical axis, between the two tail pieces and foldable about a horizontal axis at the height of the upper side of the stern.

For the steering and propulsion of small and medium-sized vessels, an outboard motor is often hung on the stern IO, whereby steering is only possible when the propeller is turning. As a result, there is insufficient lift, which means that there is not enough lateral pressure.

U.S. Pat. No. 5,102,359 discloses an electrically driven propeller 15 which is mounted between two vertical, small, elongated blades (or tail pieces) which serve as a rudder and protrude beyond the propeller to protect it. Disadvantages of this propeller are the small tailpieces, the distance between them and the attachment of the propeller with the aid of a bridge construction. When sailing with this version, there is not enough lift. The English patent publication GB 2 231 545 describes a propeller, which is attached to the lower end of a single rudder blade (or tail piece) and of which the power supply / motor is mounted at the top near the tiller. The disadvantage of this embodiment is that there will be insufficient lift when sailing with a motor with a single tail piece.

The present outboard motor overcomes these disadvantages in that on the tiller preferably two elongated vertically downwardly directed parallel shafts are attached, which serve as rudders. It is also preferred that the two parallel shafts are mounted at some distance from each other. The thickness of the two vertical shafts is preferably approximately 10% of the width in the direction of travel, while the motor nacelle is preferably suspended between the two vertical shafts, such that the motor nacelle protrudes behind the two shafts with the screw.

1035070 -2-

It is also preferred that the entire device is rotatable about an imaginary vertical axis, located between the two shafts, and also that the two shafts in a second embodiment are attached to a vertical axis with the motor nacelle rotatable or not. mounted on or through the hull of the vessel.

5

The outboard motor according to the invention will be described in more detail with reference to the following drawings;

Figure 1 shows the outboard motor in a perspective sketch.

10

In a preferred embodiment of the folding and electrically designed outboard motor 1, which is shown schematically in Figure 1, no rudder is present, while the electronics are built into the upper part 2. Attached to this upper part 2 is the tiller 3 and two elongated vertical parallel tail pieces or shafts 4. The distance between the shafts 4 is 5-10 cm. However, to obtain a good lift, approx. 8 cm is ideal. The shafts 4 have a wing profile, the thickness of which is approximately 10% of the width in the direction of travel; the thickness is preferably 1.5 cm. The motor nacelle S with screw 6 is mounted between the lower ends of the parallel shafts 4 such that the screw 6 protrudes behind the shafts 4. The advantage of this embodiment is that steering of the vessel is also possible without the motor 1 being switched on.

It is conceivable that a second embodiment of the engine 1 is not foldable, but is fixedly mounted on or through the hull of the vessel and serves as a replacement for the rudder. Incidentally, this embodiment variant is still designed with the two elongated vertical parallel tail pieces or shafts 4, between which the engine nacelle 5 is mounted.

1035070

Claims (7)

An outboard motor that is hingedly attached to the stern of a vessel and electrically driven, the electronics being accommodated in an upper part (2) with a tiller (3), characterized in that two elongated ones on the tiller (3) vertically downwardly directed parallel shafts (4) are attached, which serve as rudders. Outboard motor according to claim 1, characterized in that the two parallel shafts (4) are mounted at some distance from each other. Outboard motor according to claim 1 or 2, characterized in that the thickness of the two vertical shafts (4) is approximately 10% of the width in the sailing direction. Outboard motor according to one of claims 1 to 3, characterized in that the motor nacelle (5) is suspended between the two vertical shafts (4). Outboard motor according to one of claims 1 to 4, characterized in that the motor nacelle (5) projects behind the two shafts (4) with the screw (6). 6. Outboard motor according to one of the preceding claims, characterized in that the entire device is rotatable about an imaginary vertical axis, situated between the two shafts (4). Outboard motor according to one of the preceding claims, characterized in that the two shafts (4) are mounted with the motor nacelle (5), rotatable or not, on a vertical axis which is attached to or through the hull of the vessel is mounted. 1035070