JP7148329B2 - Rudder blades and ships - Google Patents

Description

The present invention relates to rudder blades and ships.

As a conventional rudder plate, the one described in Patent Document 1 is known. The rudder plate includes a vertically extending wing portion and end plates provided at lower and upper ends of the wing portion. The end plate is provided so as to extend horizontally at the end of the wing. As a result, by increasing lift, it is possible to increase the rudder force of the rudder plate during turning.

JP 2016-74303 A

Here, when the end plate is provided on the rudder plate, although the rudder force can be increased, the resistance to the water flow increases, so in terms of the propulsive force, it causes a decrease in the propulsive force. . As described above, the performance of the rudder plate described above may be degraded depending on the situation. Therefore, there has been a demand for a rudder blade that can exhibit performance in accordance with the situation.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rudder plate and a vessel that can exhibit performance according to the situation.

A rudder plate according to the present invention includes a wing portion extending in the vertical direction and an end plate provided on the wing portion, wherein the end plate is housed in the wing portion in a first state. and a second state in which the endplates are spread from the wings.

Such a rudder plate can switch between a first state in which the end plate is housed in the wing portion and a second state in which the end plate is spread from the wing portion. When the end plate is spread out, the rudder force of the rudder plate can be increased, and when the end plate is housed in the wing portion, an increase in resistance due to the end plate can be suppressed. Therefore, when the performance required of the rudder plate differs depending on the situation, the rudder plate can respond to each situation by switching between the first state and the second state. As described above, the rudder plate can exhibit performance according to the situation.

In the rudder blade according to the present invention, the end plate is arranged along the side surface of the wing and can be switched between a second state extending laterally from the wing. It may be provided movably with respect to the part. Thus, since the end plate is arranged along the side surface of the wing portion in the first state, the end plate can be accommodated in the wing portion without providing a complicated structure for the wing portion. In addition, compared to a structure in which the end plates are extended downward, such a structure can avoid lowering the lowest part (bottom) of the hull, and therefore does not affect the draft limit.

In the rudder plate according to the present invention, the end plate may switch between the first state and the second state by rotating with respect to the wing. As a result, the end plate can quickly switch between the first state and the second state with a simple operation.

In the rudder plate according to the present invention, the end plate can be switched between a first state in which it is stored in the wing portion and a second state in which it protrudes from the lower end of the wing portion and extends in the vertical direction. It may be provided movably with respect to the part. Since the end plate is stored in the wing portion in the first state in this way, the influence of the resistance force by the end plate can be further reduced.

In the rudder plate according to the present invention, the end plate may switch between the first state and the second state by sliding with respect to the wing portion. As a result, the end plate can quickly switch between the first state and the second state with a simple operation.

The rudder blade according to the present invention may be in the first state when the ship on which the rudder plate is mounted goes straight, and may be in the second state when the ship turns. When the ship travels straight, the rudder plate is in the first state, thereby suppressing an increase in the resistance force due to the end plates, thereby improving the propulsive force. On the other hand, when the ship is turning, the rudder plate is in the second state, so that the rudder force can be improved.

A ship according to the present invention is a ship having a rudder plate provided with a vertically extending wing portion and an end plate provided on the wing portion, wherein the rudder plate and the end plate are attached to the wing portion. Switchable between a first retracted state and a second state in which the endplates are spread out from the wings.
The rudder plate described above is installed.

According to this ship, it is possible to obtain the above-described functions and effects of the rudder plate.

ADVANTAGE OF THE INVENTION According to this invention, the steering plate and ship which can exhibit the performance according to the situation can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows a ship provided with the steering plate which concerns on embodiment of this invention. Figure 2 is an enlarged view of the stern portion of the vessel of Figure 1; It is the figure which looked at the rudder board from the front side. It is the figure which looked at the rudder plate from upper direction. FIG. 4 is a perspective view showing a drive mechanism for opening and closing the end plates using a steering gear; It is a figure which shows the steering plate which concerns on a modification. It is a figure which shows the steering plate which concerns on a modification.

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are omitted.

Drawing 1 is a side view showing a ship provided with a steering plate concerning an embodiment of the present invention. 2 is an enlarged view showing the stern portion of the vessel of FIG. 1; FIG. As shown in FIG. 1 , a ship 1 of this embodiment is a tanker or the like, and includes a hull 2 , a propulsion shaft system 3 and a rudder 4 . In the following description, the bow side direction may be referred to as "forward" and the stern side direction may be referred to as "rear".

The hull 2 has an engine room 6 on the stern side. The engine room 6 is a space for arranging equipment such as the main engine. The main engine drives the propeller of the propulsion shaft system 3 . The hull 2 has a steering gear room 7 , a space under the steering gear room 8 , and a stern structure 9 in this order from above on the stern side of the engine room 6 . The steering gear room 7 is a space for arranging a steering mechanism for steering the rudder 4, a drive unit, and the like. The steering gear room lower space 8 is a space provided below the steering gear room 7 . The stern structure 9 is provided below the steering room lower space 8 and constitutes a part of the propulsion shaft system 3 . A pump room, a cargo oil tank, a ballast tank, etc. are provided on the bow side of the engine room 6 .

As shown in FIG. 2, the steering gear room lower space 8 has a sloped portion 8a that slopes downward from a rear end portion 2a on the stern side of the hull 2 toward the bow side. Therefore, the rear end portion 9a of the stern structure 9 is arranged closer to the bow than the rear end portion 2a of the hull 2 is. A rear end portion 9a of the stern structure 9 has a shape protruding toward the stern side, and a propeller 11 of the propulsion shaft system 3 is provided at the tip portion of the protruding shape.

The propulsion shaft system 3 is a mechanism that generates a propulsion force for the ship 1 . A propulsion shafting 3 is provided for the stern structure 9 . The propulsion shaft system 3 is arranged below the inclined portion 8a of the steering gear room lower space 8, and is arranged at a position lower than at least the water surface when the ship 1 is in operation. The propulsion shaft system 3 includes a propeller 11 and a rotating shaft 12 . The propeller 11 rotates with the rotation of the rotating shaft 12 to generate a water flow toward the rear side. The rotating shaft 12 extends horizontally in the stern structure 9 from the propeller 11 toward the bow side. The bow-side end of the rotary shaft 12 receives a rotational force from the engine in the engine room 6 (see FIG. 1).

The rudder 4 is a mechanism for turning the ship 1 . The rudder 4 includes a rudder plate 20 and a rotating shaft 21 . The rudder plate 20 is arranged below the inclined portion 8a of the space under the steering room 8, and is arranged at least at a position lower than the water surface when the ship 1 is in operation. Further, the steering plate 20 is arranged at a position facing the propeller 11 on the stern side.

The rudder plate 20 extends in the vertical direction while being spread in the front-rear direction. The steering plate 20 is connected to the rotating shaft 21 at the upper end portion 20a. A detailed structure of the steering plate 20 will be described later. The rotating shaft 21 extends upward from the upper end portion 20a of the steering plate 20 . The rotating shaft 21 extends to the interior of the hull 2 through the inclined portion 8a. The rotating shaft 21 extends to the steering gear room 7 and is connected to a steering gear 22 provided in the steering gear room 7 . By rotating the rotating shaft 21, it is possible to rotate the rudder plate 20 around the rotating shaft 21 and change the orientation.

Note that the steering gear 22 is connected to the control section 25 . The steering gear 22 rotates by a specified amount in a specified rotational direction based on a control signal from the controller 25 . When the steering operation is performed by the operator, the control unit 25 transmits to the steering gear 22 a control signal including information on the rotation direction and rotation amount based on the turning direction and turning amount.

Next, the configuration of the steering plate 20 according to this embodiment will be described with reference to FIGS. 2 to 4. FIG. FIG. 3 is a front view of the rudder plate. FIG. 4 is a top view of the rudder plate. As shown in FIGS. 2 to 4, the rudder plate 20 includes a vertically extending wing portion 30 and a pair of end plates 40, 40 provided on the wing portion 30. As shown in FIGS.

The wing portion 30 constitutes a body portion of the rudder plate 20 . The wing portion 30 has a front end 31 extending in the vertical direction on the front side, a rear end 32 extending in the vertical direction on the rear side, an upper end 33 extending in the front-rear direction on the upper side, and a lower end 34 extending in the front-rear direction on the lower side. (See Figure 2). Further, the wing portion 30 has side surfaces 35, 35 extending in the vertical direction and the front-rear direction (see FIGS. 3 and 4). Here, the direction perpendicular to the up-down direction and the front-rear direction is referred to as the "horizontal direction". Further, the direction from the side surfaces 35, 35 toward the center line CL (see FIG. 3) in the lateral direction of the rudder plate 20 is referred to as "laterally inner side", and the opposite side is referred to as "laterally outer side". The wings 30 may have a streamlined shape when viewed from above (as shown in FIG. 4). Explanation will be given assuming that the shape is rectangular.

As shown in FIG. 3, the side surfaces 35, 35 of the wing portion 30 have main surfaces 35a, 35a that occupy substantially the entire area other than the area near the lower end 34 of the side surfaces 35, 35. As shown in FIG. Further, the side surfaces 35, 35 of the wing portion 30 have stepped portions near the lower end 34, and thus have stepped surfaces 35b, 35b and stepped bottom surfaces 35c, 35c. The step surfaces 35b, 35b extend inwardly of the wing portion 30 in the lateral direction from the lower ends of the main surfaces 35a, 35a. The stepped bottom surfaces 35c, 35c extend downward to the lower end 34 from the laterally inner ends of the stepped surfaces 35b, 35b. The main surfaces 35a, 35a and the stepped bottom surfaces 35c, 35c are formed substantially parallel to each other. The lateral dimensions of the stepped surfaces 35 b , 35 b , that is, the depth of the step may be set substantially equal to the thickness of the end plate 40 . The step surfaces 35b, 35b and the step bottom surfaces 35c, 35c extend in the front-rear direction. The stepped surfaces 35b, 35b and the stepped bottom surfaces 35c, 35c function as a storage portion 36 for storing the end plate 40. As shown in FIG.

The end plates 40 , 40 are movably provided with respect to the wing portion 30 . The end plates 40 , 40 are configured by band-shaped plate members that are attached to the vicinity of the lower ends 34 of the wings 30 and extend in the front-rear direction. One end in the width direction of the end plates 40 , 40 is attached to the wing portion 30 via the rotating portion 41 . The other ends in the width direction of the end plates 40, 40 can be moved toward and away from the wings 30 as free ends 40a, 40a. With such a configuration, the end plates 40 , 40 can rotate around the rotating portion 41 with respect to the wing portion 30 . The rotating portion 41 is provided at a corner portion between the lower end 34 and the stepped bottom surfaces 35c, 35c. The rotation axis of the rotating portion 41 is arranged to extend in the front-rear direction. Therefore, the end plates 40, 40 rotate so that the free end portions 40a, 40a draw an arc around the rotation axis of the rotating portion 41 when viewed from the front-rear direction.

The rudder plate 20 switches between a first state in which the end plates 40 , 40 are accommodated in the wing portion 30 and a second state in which the end plates 40 , 40 are spread from the wing portion 30 . A state in which the end plates 40 , 40 are housed in the wing portion 30 is a state in which the end plates 40 , 40 are incorporated in the wing portion 30 as members forming part of the wing portion 30 . Therefore, when the end plates 40, 40 are housed in the wing portion 30, the end plates 40, 40 do not substantially affect the water flow from the propeller 11 (see FIG. 2). 40 is stopped or suppressed. The state in which the end plates 40, 40 are spread from the wing portion 30 means that the end plates 40, 40 are arranged at a position spaced apart from the wing portion 30, so that the end plates 40, 40 are arranged in the water as independent members from the wing portion 30. state. Therefore, when the end plates 40, 40 are spread out from the wing portion 30, the end plates 40, 40 have an effect on the water flow from the propeller 11 (see FIG. 2). is demonstrated.

In this embodiment, FIG. 3(a) shows the first state, and FIG. 3(b) shows the second state. In this embodiment, the endplates 40,40 toggle between a first state in which they are positioned along the sides 35,35 of the wings 30 and a second state in which they extend laterally from the wings 30. It is provided movably relative to the wings 30 as possible. Also, the end plates 40 , 40 switch between the first state and the second state by rotating with respect to the wing portion 30 .

As shown in FIG. 3( a ), in the first state, the end plates 40 , 40 are arranged along the side surfaces 35 , 35 . That is, the end plates 40, 40 are arranged to extend along the side surfaces 35, 35 in contact with the main surfaces 40b, 40b and the side surfaces 35, 35 so as to overlap each other. Here, the end plates 40 , 40 are housed in the housings 36 , 36 of the wings 30 . At this time, the end plates 40, 40 function as members that fill the spaces of the storage portions 36, 36. As shown in FIG. The main surfaces 40b, 40b of the end plates 40, 40 are in contact with the stepped bottom surfaces 35c, 35c so as to overlap each other. The opposite major surfaces 40c, 40c are arranged to be exposed to water. The main surfaces 40c, 40c function as surfaces that are substantially continuous with the main surfaces 35a, 35a of the wing portion 30 . That is, the main surfaces 40c, 40c function as part of the area near the lower end 34 of the side surfaces 35, 35 of the wing portion 30. As shown in FIG. The free ends 40a, 40a of the end plates 40, 40 are arranged to face the step surfaces 35b, 35b. In this state, the end plates 40, 40 have no effect (or the effect is suppressed) as a member that increases resistance to water flow. That is, the resistance to the water flow of the rudder plate 20 in the first state and the rudder plate composed only of the wing portions 30 are substantially the same.

As shown in FIG. 3( b ), in the second state, the end plates 40 , 40 are arranged to extend laterally from the wings 30 . That is, the end plates 40, 40 are held at a position rotated downward by approximately 90° around the rotating portions 41, 41 from the first state. As a result, the end plates 40, 40 are expanded from the storage portions 36, 36 to the outside of the wing portion 30, and the main surfaces 40b, 40b are separated from the stepped bottom surfaces 35c, 35c. As a result, the main surfaces 40b, 40b and the main surfaces 40c, 40c of the end plates 40, 40 are arranged so as to extend horizontally in the water. In the second condition, the endplates 40,40 function as members that extend the rudder area relative to the sides 35,35 of the wing 30 near the lower end 34 of the wing. In the second state, due to the hydrodynamic mirror image effect of the end plates 40, 40, the aspect ratio of the rudder blade 20 is substantially increased compared to the first state, resulting in a large lift (approximately 3-10 % increase), the rudder force increases and the ship becomes easier to steer.

FIG. 4(a) shows the first state, and FIG. 4(b) shows the second state. As shown in FIG. 4, the rudder plate 20 is in the first state when the ship 1 on which the rudder plate 20 is mounted goes straight, and in the second state when the ship 1 turns. As shown in FIG. 4(a), when the ship 1 travels straight, the wing portions 30 are in a posture that extends straight in the front-rear direction. As a result, the wing portion 30 is arranged in a posture along the water flow W directed from the front to the rear due to the rotation of the propeller 11 . At this time, since the end plates 40, 40 are housed in the wing portion 30, they do not affect the water flow W. As shown in FIG. Thereby, the rudder plate 20 can suppress the influence of the increase of the resistance force with respect to the water flow W by the end plates 40 and 40, and can raise propulsive force.

As shown in FIG. 4(b), when the ship 1 turns, the wing portion 30 rotates and assumes a posture that is inclined with respect to the front-rear direction. As a result, the wing portion 30 is arranged in an inclined posture with respect to the water flow W. As shown in FIG. At this time, since the end plates 40, 40 are widened from the wing portion 30, they exhibit the function of expanding the rudder area. Thereby, the rudder plate 20 can increase the rudder force by the amount to which the end plates 40, 40 are added.

As shown in FIG. 2, the ship 1 includes a drive unit 50 that switches between a first state and a second state by opening and closing end plates 40, 40, and a power source 51 for the drive unit 50. . The drive unit 50 is, for example, an electric motor such as a steering gear, or a hydraulic cylinder. The power source 51 is constituted by a power supply and supplies electric power to the driving section 50 when the driving section 50 is an electric motor. The power source 51 is configured by a pump and supplies working oil to the drive section 50 when the drive section 50 is a hydraulic cylinder. Although the arrangement is not particularly limited, in FIG. 2, the drive section 50 is arranged inside the wing section 30 of the steering plate 20, and the power source 51 is arranged in the steering gear room 7 above the water surface. The power source 51 supplies electric power and hydraulic oil to the drive unit 50 via electric wires, pipes, or the like that pass through the rotating shaft 21 . The control unit 25 can control the operation of the drive unit 50 by transmitting control signals to the power source 51 . When the ship 1 is traveling straight, the control unit 25 transmits a control signal to the steering gear 22 to keep the wing portions 30 straight in the longitudinal direction, and transmits a control signal to the power source 51 to A first state in which the end plate 40 is accommodated in the wing portion 30 is assumed (see FIG. 4A). When the boat 1 turns, the control unit 25 transmits a control signal to the steering gear 22 to tilt the wing unit 30 in the longitudinal direction, and also transmits a control signal to the power source 51 . 4B, the end plate 40 is expanded from the wing portion 30 (see FIG. 4B).

An example of a drive mechanism for opening and closing the end plate 40 will be described with reference to FIG. FIG. 5 is a perspective view showing a drive mechanism for opening and closing the end plates using a motor. In FIG. 5, only the wall portion forming the lower end 34 of the wing portion 30 is indicated by solid lines, and the other wall portions are indicated by phantom lines. In FIG. 5, the thickness of the end plate 40 is shown in a reduced state, and the gaps between the components are also shown in a greatly emphasized state so as to facilitate understanding of the drive mechanism. The rotating portion 41 includes a rotating shaft 61 fixed to the end plate 40 and bearing portions 62 , 62 that rotatably support both ends of the rotating shaft 61 . Both end portions of the rotating shaft 61 are arranged inside the wing portion 30 via stepped surfaces 35d, 35d facing each other in the front-rear direction. A bevel gear 66 is provided at one end of the rotating shaft 61 . The driving section 50 is configured by a motor 63 arranged inside the wing section 30 . The shaft of the motor 63 extends laterally and has a bevel gear 64 at its tip. The bevel gear 64 is arranged so as to mesh with the bevel gear 66 of the rotating shaft 61 . Thereby, the torque of the motor 63 is converted into the torque of the rotary shaft 61 via the bevel gears 64 and 66 .

When a hydraulic cylinder is employed as the drive unit 50, the shaft of the hydraulic cylinder is passed through the side surface 35 from the inside of the wing portion 30 to the outside, and the end plate 40 is moved by the shaft (or a link mechanism connected thereto). You can open and close.

Next, the operations and effects of the steering plate 20 and the ship 1 according to this embodiment will be described.

The rudder plate 20 according to the present embodiment is a rudder plate 20 including a wing portion 30 extending in the vertical direction and an end plate 40 provided in the wing portion 30. The end plate 40 is the wing portion 30 and a second state in which the end plate 40 is spread from the wings 30.

Such a rudder plate 20 can switch between a first state in which the end plate 40 is housed in the wing portion 30 and a second state in which the end plate 40 is spread from the wing portion 30 . When the end plate 40 is spread out, the steering force of the rudder plate 20 can be increased. Therefore, when the performance required of the rudder plate 20 differs depending on the situation, the rudder plate 20 can respond to each situation by switching between the first state and the second state. As described above, the rudder plate 20 can exhibit performance according to the situation.

In the rudder plate 20 according to this embodiment, the end plate 40 has a first state in which it is arranged along the side surface 35 of the wing portion 30 and a second state in which it extends laterally from the wing portion 30. It is movably provided with respect to the wings 30 so as to be switchable. Thus, since the end plate 40 is arranged along the side surface of the wing portion 30 in the first state, the end plate 40 can be accommodated in the wing portion 30 without providing a complicated structure for the wing portion 30. can be done. For example, in the rudder plate 120 shown in FIG. 7 described later, it is necessary to provide an internal structure and a seal structure for storing the end plate 140, but in the rudder plate 20 according to the present embodiment, the end plate 40 is attached to the side surface 35 The end plate 40 can be accommodated in the wing portion 30 simply by arranging it along. In addition, compared to the structure in which the end plate extends downward (the structure shown in FIG. 7), such a structure can avoid lowering the lowest part (bottom part) of the hull, so the influence on the draft limit can be avoided. do not affect

In the steering plate 20 according to this embodiment, the end plate 40 switches between the first state and the second state by rotating with respect to the wing portion 30 . As a result, the end plate 40 can quickly switch between the first state and the second state with a simple operation.

The rudder plate 20 according to the present embodiment is in the first state when the ship 1 on which the rudder plate 20 is mounted goes straight, and in the second state when the ship 1 turns. When the ship 1 travels straight, the rudder plate 20 is in the first state, thereby suppressing an increase in the resistance force of the end plate 40, thereby improving the propulsive force. On the other hand, when the ship 1 turns, the rudder plate 20 is in the second state, so that the steering force can be improved.

The above-described steering plate 20 is mounted on the ship 1 according to this embodiment.

According to this ship 1, there can exist an effect|action and effect of the above-mentioned rudder plate 20. As shown in FIG.

The invention is not limited to the embodiments described above.

In the above-described embodiment, in the second state, the end plates 40, 40 are arranged to extend laterally. Alternatively, as shown in FIG. 6(a), the end plates 40, 40 may be arranged to extend downward in the second state. In this case, the end plates 40, 40 are arranged so that the free ends 40a, 40a are directed downward by rotating about 180° around the rotating portion 41 from the first state. Even if it is arranged in this way, the end plates 40, 40 can expand the rudder area of the rudder plate 20 compared to the first state, so that the rudder force can be increased.

Further, in the above-described embodiment, the wing portion 30 has the storage portion 36, and in the second state, the end plates 40, 40 are housed in the wing portion 30 by being stored in the storage portion 36. FIG. Alternatively, as shown in FIG. 6B, a wing portion 30 that does not have a storage portion 36 may be employed. The wing portion 30 also has main surfaces 35a, 35a in the vicinity of the lower end 34 thereof. In the first state, the end plates 40, 40 are in contact with each other such that the main surfaces 40b, 40b and the main surfaces 35a, 35a are superimposed. The end plates 40, 40 protrude from the main surfaces 35a, 35a by the thickness of the end plates 40, 40 respectively. Even in such a state, the resistance by the end plates 40, 40 can be kept low. That is, such a state also corresponds to a state in which the end plates 40 , 40 are housed in the wing portions 30 .

Also, in the above-described embodiment, the endplates 40, 40 are arranged in a first state along the sides 35, 35 of the wing 30 and in a second state extending laterally from the wing 30. , is movably provided with respect to the wing portion 30. Alternatively, a steering plate 120 as shown in FIG. 7 may be employed. As shown in FIG. 7, the end plate 140 can switch between a first state in which it is housed within the wing portion 130 and a second state in which it protrudes from the lower end 134 of the wing portion 130 and extends in the vertical direction. It is movably provided with respect to the wing portion 130 as shown. As shown in FIG. 7( a ), in the first state, the end plate 140 is arranged inside the internal space SP of the wing portion 130 . The end plate 140 is connected to the hydraulic cylinder 150 arranged above in the internal space SP. A wall portion 136 is provided between the hydraulic cylinder 150 and the end plate 140 . A shaft 151 of a hydraulic cylinder 150 penetrates through the wall portion 136 while ensuring a sealing property. Accordingly, the wall portion 136 can prevent seawater that has entered the lower region of the internal space SP of the wing portion 130 from the opening of the lower end 134 from entering the region where the hydraulic cylinder 150 is arranged. As shown in FIG. 7B, the end plate 140 moves downward by being pushed by the shaft 151 of the hydraulic cylinder 150 . As a result, the end plate 140 extends downward from the opening of the lower end 134 of the wing portion 130 . That is, end plate 140 switches between the first state and the second state by sliding relative to wing portion 130 .

As described above, in the rudder plate according to the modification, the end plate 140 can be in a first state stored in the wing portion 130 and a second state in which the end plate 140 protrudes from the lower end of the wing portion 130 and extends in the vertical direction. , is movably provided with respect to the wing portion 130 so as to be able to switch between . Since the end plate 140 is stored in the wing portion 130 in the first state in this way, the influence of the resistance force due to the end plate 140 can be further reduced.

In the rudder plate according to the modification, the end plate 140 switches between the first state and the second state by sliding with respect to the wing portion 130 . As a result, the end plate 140 can quickly switch between the first state and the second state with a simple operation.

Further, in the above-described embodiment and modified example, the drive section for moving the end plate is provided in the wing section. Alternatively, a configuration in which the drive section is provided on the hull 2 side may be employed. For example, a driving unit such as a steering gear and hydraulic cylinders may be provided in the steering chamber 7, and the driving force of the driving unit may be transmitted to the end plate by a combination of a link mechanism, a gear mechanism, and the like. Such a driving force transmission mechanism may pass through the rotating shaft 21 . Further, a conversion mechanism may be provided in which the rotational force of the steering gear 22 (see FIG. 2) with respect to the steering plate is converted into the driving force of the end plates via a link mechanism or a gear mechanism. As a result, the end plate can be widened at the timing when the steering gear 22 rotates the rudder plate when the ship turns.

Also, in the above-described embodiment and modifications, the end plate was provided only at the lower end, but instead of or in addition to this, an end plate may also be provided at the upper end. In this case, the end plate for the upper end may also employ a switching structure having the same effect as the end plate described above. Alternatively, the switching structure may be adopted for only one of the upper end plate and the lower end plate.

In the above embodiment, the tanker is used as a ship, which is particularly suitable.

DESCRIPTION OF SYMBOLS 1... Ship, 20,120... Rudder plate, 30,130... Wing part, 40,140... End plate.

Claims (6)

a wing portion extending in the vertical direction;
A rudder plate comprising an end plate provided in the wing portion,
a first state in which the end plate is housed in the wing;
switching between a second state in which the end plate is spread from the wing ;
The endplates are arranged in the first state along the side surfaces of the wings and in the second state laterally extending from the wings such that the major surfaces of the endplates extend horizontally. A rudder plate movably provided with respect to the wing so as to be switchable between a state and a state . The rudder blade according to claim 1, wherein the end plate switches between the first state and the second state by rotating with respect to the wing. a wing portion extending in the vertical direction;
A rudder plate comprising an end plate provided in the wing portion,
a first state in which the end plate is accommodated in the wing;
switching between a second state in which the end plate is spread from the wing;
the end plate switches between the first state and the second state by rotating about the rotating portion with respect to the wing portion;
The steering plate arranged so that the axis of rotation of the rotation part may extend in the direction of order. According to any one of claims 1 to 3 , the first state is set when the ship on which the rudder plate is mounted goes straight, and the second state is set when the ship turns. rudder plate. A ship having a rudder plate including a wing portion extending in the vertical direction and an end plate provided on the wing portion,
the rudder plate in a first state in which the end plate is housed in the wing;
a second state in which the end plate is spread from the wing , and
The endplates are arranged in the first state along the side surfaces of the wings and in the second state laterally extending from the wings such that the major surfaces of the endplates extend horizontally. a vessel movably mounted with respect to the wing so as to be switchable between a state of A ship having a rudder plate including a wing portion extending in the vertical direction and an end plate provided on the wing portion,
the rudder plate in a first state in which the end plate is housed in the wing;
a second state in which the end plate is spread from the wing , and
the end plate switches between the first state and the second state by rotating about the rotating portion with respect to the wing portion;
The vessel , wherein the rotation axis of the rotating portion is arranged to extend in the front-rear direction .

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