EP2565116B1 - Device for roll stabilisation - Google Patents

Description

The invention relates to a device for roll stabilization of ships, consisting of a flow-bearing shaft as fin shaft with a drive device for rotating a fin in the form of an elongated quadrilateral with short and long sides about the axis of the fin shaft in order to change the angle of attack of the fin and from a Pivoting device for an angular movement of the fin and fin shaft about a substantially vertical and perpendicular to the ship's longitudinal direction pivot axis for swinging the fin in an operating position outside and in a rest position in an associated fin pocket within the ship, wherein via a fin shaft takes place a fin adjustment.

Fin arrangements of this type are known in various designs with quadrangular fin surfaces, the majority of the fins are optimized due to their aspect ratio exclusively for operation while driving. In this type of fin is to optimize the effective fin surface for stabilization at anchor or at zero speed, the need to arrange the fin shaft, as far as technically possible, to the front fin edge and at the same time form the largest possible chord length in order to achieve a large effective lever arm of the rear fin surface. This reduces the aspect ratio of the fin compared to conventional fin designs for operation underway.

Here, due to the changed aspect ratio, there is the defect that with fins of this embodiment a complete pivoting into a fin pocket is made possible only by additional measures, such as a shaft extension with simultaneous displacement of the pivoting column in the direction of amidships. As a result, but disadvantages, such as larger bearing forces, larger shaft deflections and higher material costs due to a longer shaft must be taken into account. These disadvantages are exhibited by all known types of swivelable fins, which are designed for stabilization at zero speed.

After DE 29 23 630 Known as the closest prior art, a fin is known that has the shape of an elongated quadrilateral. Here, a long side is swept in the direction of travel, the second long edge, however, is swept in the opposite direction. This design is optimized with a high aspect ratio for on-the-go stabilization, and is particularly detrimental to pre-anchor stabilization, zero-speed stabilization, since it reduces the effective area behind the shaft axis and does not increase it. This design also does not solve the problem occurring in fins with a lower aspect ratio and early balancing that they are no longer completely swinging.

The object of the invention is to provide an increase in a usable fin surface for stabilization at anchor in an easy way with an unchanged position of the pivot column and thereby completely absorb the fin surface in the rest position or almost completely in the fin pocket and the fin still for a stabilization even while driving to use.

The solution of this object is achieved according to the invention in that the fin is arranged with its the ship's outside facing short side in the operating position approximately parallel to the ship's outer skin and the long sides of the fin have an angled in the direction of travel backwards arrow and a fin shaft axis in the range of 10 to 30 % of a mean chord length of the fin is arranged at a central span, wherein the pivotal movement of the pivoting column from the operating position is measured in the rest position for receiving the fin in the fin pocket greater than 90 degrees in accordance with the sweep.

In this way, the advantage is achieved that with an unchanged position of the shaft axis due to the sweep additionally an effective surface for stabilization against anchor at the trailing edge is gained, while eliminating the same area proportion of the front fin edge. Thus, with unchanged total area of the fin, the surface area usable for stabilization at anchor becomes larger and thus the stabilization performance is improved. If necessary, the space situation for the connection between the fin and Shaft. At the same time, the conditions for stabilization while driving are maintained.

An advantageous embodiment is created in that the fins have a sweep at an angle between 10 ° and 30 ° degrees.

Fig. 1 und 2

eine Flosse in Ruhestellung und in Betriebsstellung;

Fig. 3 bis 5

weitere Ausführungsformen einer Flosse in Viereckform mit mindestens einer im Winkel abweichenden Außenseite

Furthermore, it is proposed that the fin shaft axis extends in extension to the outer front corner region of the fin.
In the drawings, embodiments of the invention are shown schematically. Show it:

Fig. 1 and 2

a fin at rest and in operating position;

Fig. 3 to 5

further embodiments of a fin in quadrangular shape with at least one angled outside

In the arrangements shown schematically, a fin pocket 2 is formed in a ship's outer skin 1, which arranged in a dedicated area a pivoting column 3 with a pivotable and driven fin shaft 4. The fin shaft 4 with its fin shaft 8 is connected to a fin 5 for roll stabilization.

The fin 5 is formed in the form of a quadrilateral, wherein the ship-side short side 6 of the fin 5 in the operating position parallel to the ship's outer skin 1 and the long sides 7 have an angled rearwardly in the direction of travel 9 Pfeil 10.

Due to the arrangement of the fin shaft 8 in the range of 10 to 30% of a mean chord length 11 of the fin 5 at central span, a large surface area of the fin 5 usable for stabilization at anchor is created. A pivoting movement of the fin 5 to achieve a rest position in the fin pocket 2 is given by the fact that according to the arrow 10, the pivoting column 3 is pivotable by more than 90 degrees to set a complete or nearly complete recording of the fin 5 in the fin pocket 2.

In the Fig. 3 to 5 embodiments of the fin 5 are shown, wherein at least one outer side of the quadrangle deviates in angle.

This deviates according to Fig. 3 a trailing edge of the long side 7 of the fin 5, while in Fig. 4 an outer edge of the short side 6 deviates. In Fig. 5 In contrast, the outer and trailing edge of the fin 5 have a deviation.

Claims (3)

1. Device for the roll stabilisation of ships, said device consisting of a fin-carrying shaft as a fin stock having a driving device for rotating a fin, in the form of an elongated quadrilateral with short and long sides and a ratio of the sides, such as about 1.7:1, which is optimised for stabilisation at anchor, about the axis of the fin stock for the purpose of changing the angle of incidence of the fin, said device also consisting of a pivoting device for an angular movement of the fin and fin stock about an axis of pivoting which extends substantially vertically and at right angles to the longitudinal direction of the ship, for the purpose of pivoting the fin outwards and inwards into an operating position outside, and an inoperative position within, an associated fin pocket inside the ship, wherein adjustment of the fin takes place via the fin stock, characterised in that the fin (5) is arranged with its short side (6), that faces towards the outside (1) of the ship, approximately parallel to the outer skin (1) of the ship when in the operating position, and the long sides (7) of the fin (5) have a sweep-back (10) which is angled rearwards in the direction of travel (9), and an axis (8) of the fin stock is arranged in the region of 10 to 30% of a mean chord length (11) of the fin (5) at central span width, the pivoting movement of the pivoting column (3) out of the operating position and into the inoperative position being dimensioned, in a manner corresponding to the sweep-back (10), so as to be greater than 90 degrees for the purpose of receiving the fin (5) in the fin pocket (2).
2. Device according to Claim 1, characterised in that the fins (5) have a sweep-back at an angle of between 10 and 30 degrees.
3. Device according to Claim 1 or 2, characterised in that the axis (8) of the fin stock extends, in prolongation, to the outlying front corner region of the fin.

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