JPS5848240Y2 - rudder support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a rudder, and more particularly to a support structure for a rudder in which a fixed portion of a rudder plate is supported by two left and right brackets, thereby supporting the rudder plate in a well-balanced manner.

Generally, the direction of a ship is changed using a rudder installed on the ship.

However, a large amount of force is applied to the rudder as the ship changes direction, and as the size of the ship increases, the rudder has to be made more rigid, which has caused more problems than in the past.

FIG. 1 is a schematic side sectional view showing a typical support structure for a type of rudder generally called a hanging rudder.

As shown in the figure, 1 is the stern of a ship, and a propeller 2 for propelling the ship is attached to the lower part of the stern.

A rudder 3 of the ship 1 is provided at the rear of the propeller 2. The rudder includes a support portion 4, a rudder plate 5, and a rudder post 6.

The support part 4 is a columnar member extending vertically downward from the bottom of the stern part 1.

A projecting portion 2 a that projects horizontally to the rear of the propeller 2 is formed at the lower part of the support portion 4 .

Further, the rudder plate 5 is a plate-like member having a streamlined cross section, and is vertically supported by the projecting portion 2a so as to be integral with the support portion 4, and is formed to be freely rotatable about this axis. There is.

Furthermore, the rudder post 6 is provided to transmit power from a drive source in order to rotate the rudder plate 5.

This is a generally rod-shaped body whose one end is connected to the upper part of the rudder plate 5 and rearward from its center axis, and the other end is located on the center axis of the rudder plate 5. It is a member of

Therefore, as shown in the figure, the rudder post 6 has a complicated curved shape.

However, when a ship equipped with this rudder 3 drives the rudder post 6 to rotate the rudder plate 5 in order to change direction, the axis of rotation of the rudder plate 5 (1°C) as shown in the figure is Since there is a large difference in the size of area A and area B with respect to A, P, ), it was necessary to increase the output of the steering gear to rotate them.

That is, when rotating the rudder plate 5, a force is exerted on the A portion of the rudder plate 5 due to the flow of water that causes it to rotate in the opposite direction.

Then, a force is applied to the l, -B part that cancels the force applied to the A part, but because the area of the A part is overwhelmingly large, it was not possible to sufficiently cancel out the force applied to this part. .

However, a major functional drawback of this is that the fixed support part 4 is located in front of the rudder plate 5, and this part has little effect on the effectiveness of the rudder, so the area of part B must be small. I didn't get it.

Moreover, due to such a structure, the balance of the upper part F of the steering plate 5 was also poor.

On the other hand, in order to solve this problem, it has been considered to position the support part 4 at the front, or to extend the KBB portion forward as shown by the imaginary line in the figure.

However, in this case, the propeller 2 must also be positioned forward as shown by the imaginary line.

Also, if you do this, the volume of the ship will decrease accordingly.
There was a problem.

Conventionally, for such a rudder 3, a support part 4 and a rudder plate 5 are used.
There was a problem that cavitation occurred in the gap 4a of 88 minutes, and the rear part of the support part 4 was eroded by this.

The present invention has been devised in view of the various problems of the rudder support structure as described above, and to effectively solve these problems.

Next, the purpose of this invention will be described.

(2) To provide a rudder support structure that can improve the area balance of the rudder plate without causing any other problems, thereby reducing the output of the steering gear.

■ To provide a rudder support structure that can prevent cavitation occurring in the gap between the rudder plate and the bracket.

■ To provide a rudder support structure that allows the rudder post to have a simple shape.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a side view showing the rudder support structure according to the present invention;
As shown in FIGS. 2 and 3, a rudder support structure γ according to the present invention is installed behind the propeller 2 provided at the stern part 1. It is provided.

The rudder support structure γ is composed of a support portion 8, a rudder plate 9, a fixed portion 8a of the rudder plate 9, and a rudder post 10.

As shown in FIG. 2, a fixed portion 8a that supports the steering plate 9 is located near the rear on the axis of the two propulsion propellers.

A rudder plate 9 is rotatably supported on the fixed portion 8a by a shaft or the like (not shown), and is also supported perpendicularly behind the propeller 2.

Further, the fixed part 8a has a part extending parallel to the side direction from the fixed part 8a in the horizontal direction or in the radial direction to allow rotation of the rudder plate 9, and is supported by a supporting part 8 suspended below the hull. There is.

This support part 8 is a substantially U-shaped member as shown in the figure, and its lower part is connected to the fixing part 8a. This part has a horizontally or radially extended part 8b to allow rotation of the rudder plate 9, and its upper part is attached to the lower part of the stern part 1.

Further, the cross section of the steering plate 9 is a plate-like member with a streamlined shape, and a cut is formed so that it just fits into the fixing part 8a and becomes integral with it.

After the rudder plate 9b is attached integrally with the fixed part 8a, it is connected to a rotating shaft (A) via a shaft (not shown).
, P, ).

Further, the rudder post 10 is a rod-shaped member located on the pivot center line of the rudder plate 9, and one end thereof is fixed to one part of the rudder plate 9, and the other end is connected to the illustrated steering gear. has been done.

When a ship with such a rudder support structure γ changes direction, looking at the areas of portion A and portion B, which are simply removed from the axis of rotation (A, P,), are as follows: A
It can be seen that the area of part B is substantially increased, although the part is not substantially changed.

When the rudder plate 9 is rotated around the rotation axis (A, P,), as described above, a force acts on the A portion to return the rudder plate 9, and a force counteracting this acts on the B portion.

Therefore, the output of the steering device of the steering plate 9 can be reduced by the increase in the area of the portion B.

Furthermore, since the portion B can be almost uniformly distributed vertically with the fixed portion 8a as a boundary, the vertical balance of the steering plate 9 is also improved.

Therefore, the shaft (not shown) supporting the steering plate 9 is not unevenly worn, and its durability can be increased.

Furthermore, conventionally, as shown in FIG.
A does not exist in the present invention as shown in FIGS. 2 and 3.

Therefore, it is possible to prevent cavitation occurring in such a gap 4a, and thereby to prevent corrosion of the support portion.

Further, since the support portion 8 is not fixed above the steering plate 9 as in the conventional case, the shape of the rudder post 10 can be made into a simple bar shape.

Moreover, it can be said that this is better in terms of manufacturability, durability, etc., than the conventional rudder post 6 which has a curved and complicated shape.

Like the normal Viking-type rudder, it does not require a sole piece, and the propeller shaft can be mounted relatively downward.

Although the shape of the support part 8 in FIG. 3 is U-shaped, it is not limited to this, and it goes without saying that any shape may be used as long as it extends in the radial direction from the fixed part 8a.

In summary, the present invention exhibits the following excellent effects.

■ The output of the steering gear that rotates the rudder plate can be reduced.

■ Cavitation can be prevented from occurring, and erosion caused by this can be prevented.

■ The shape of the rudder post can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional rudder support structure, Fig. 2 is a side view showing a rudder support structure according to the present invention, and Fig. 3 is a sectional view taken along the line A-A in Fig. 2. . In addition, 2 is a propulsion propeller, 3. γ is the rudder support structure, 4,
8 is a support part, 8a is a fixed part, and 5 and 9 are rudder plates.

Claims (1)

[Scope of utility model registration request] A fixed part that rotatably supports the rudder plate rearward on the axis of the propeller shaft in a sideward direction toward a rudder support structure for suspending and supporting the rudder plate provided at the rear of the propulsion propeller from the hull. A rudder is provided with a bracket that is suspended from and supported by the hull F, and has a portion that allows rotation of the rudder plate by extending the fixing portion in parallel to the side of the ship. support structure.