JP2020037302A - Rudder plate and vessel - Google Patents

Abstract

To provide a rudder plate and a vessel capable of demonstrating performance according to a situation.SOLUTION: A rudder plate 20 is capable of switching between a first state with an end plate 40 stored in a vane 30 and a second state with the end plate 40 expanded from the vane 30. Rudder force of the rudder plate 20 is capable of being increased in a state with the end plate 40 expanded and increase in resistance force by the end plate 40 is capable of being suppressed in a state with the end plate 40 stored in the vane 30. Therefore, when a performance required in the rudder plate 20 differs according to the situation, the rudder 20 is capable of corresponding to each situation by switching between the first state and the second state.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rudder plate and a ship.

  BACKGROUND ART As a conventional rudder plate, one described in Patent Document 1 is known. The rudder plate includes a wing extending vertically, and end plates provided at the lower end and the upper end of the wing. The end plate is provided at the end of the wing portion so as to extend in the horizontal direction. Thus, the steering force of the rudder plate during turning can be increased by increasing the lift.

JP-A-2006-74303

  Here, when the end plate is provided on the rudder plate, although the rudder force can be increased, the resistance force against the water flow increases, and in terms of the propulsion force, the propulsion force decreases. . As described above, the performance of the above-described rudder plate may be reduced depending on the situation. Therefore, there has been a demand for a rudder plate capable of exhibiting performance according to the situation.

  Then, an object of the present invention is to provide a rudder board and a ship which can exhibit performance according to a situation.

  A rudder plate according to the present invention is a rudder plate provided with a wing portion extending in a 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 the second state in which the end plate is spread from the wing.

  Such a rudder plate can switch between a first state in which the end plate is housed in the wing and a second state in which the end plate is spread from the wing. In the state where the end plate is spread, the steering force of the rudder plate can be increased, and in the state where the end plate is housed in the wing portion, the increase in the resistance force due to the end plate can be suppressed. Therefore, when the performance required for the rudder plate differs depending on the situation, the rudder board 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 plate according to the present invention, the end plate has a wing so that the end plate can be switched between a first state arranged along the side surface of the wing part and a second state extending laterally from the wing part. It may be provided movably with respect to the part. As described above, since the end plate is arranged along the side surface of the wing in the first state, the end plate can be housed in the wing without providing a complicated structure for the wing. In addition, such a configuration can prevent the lowest portion (bottom portion) of the hull from being lowered as compared with a structure in which the end plate is extended downward, and thus 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. Thus, 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 has a wing so that the end plate can be switched between a first state stored in the wing portion and a second state protruding from the lower end of the wing portion and extending vertically. It may be provided movably with respect to the part. In this manner, the end plate is stored in the wing portion in the first state, so that the influence of the resistance 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. Thus, the end plate can quickly switch between the first state and the second state with a simple operation.

  In the rudder board according to the present invention, the first state may be set when the ship on which the rudder board is mounted goes straight, and the second state may be set when the ship turns. When the marine vessel is traveling straight, the rudder plate is in the first state, so that an increase in resistance due to the end plate is suppressed, so that the propulsive force can be improved. On the other hand, when the boat turns, the rudder plate is in the second state, so that the rudder force can be improved.

A marine vessel according to the present invention is a marine vessel having a rudder plate provided with a wing portion extending vertically and an end plate provided on the wing portion, wherein the rudder plate has an end plate attached to the wing portion. It is switchable between a stored first state and a second state in which the end plate is extended from the wing.
The rudder plate described above is mounted.

  According to this ship, the operation and effect of the rudder plate described above can be obtained.

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

It is a side view showing a vessel provided with a rudder board concerning an embodiment of the present invention. It is an enlarged view which shows the stern part of the ship of FIG. It is the figure which looked at the rudder board from the front side. It is the figure which looked at the rudder board from the upper part. It is a perspective view which shows the drive mechanism for opening and closing an end plate using a steering machine. It is a figure showing a rudder board concerning a modification. It is a figure showing a rudder board concerning a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same or corresponding parts will be denoted by the same reference characters, without redundant description.

  FIG. 1 is a side view showing a boat provided with a rudder plate according to an embodiment of the present invention. FIG. 2 is an enlarged view showing a stern portion of the ship shown in FIG. As shown in FIG. 1, a ship 1 of the present 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 direction on the bow side may be referred to as “front” and the direction on the stern side 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 disposing devices such as a main engine. The main engine drives the propeller of the propulsion shaft system 3. The hull 2 has a rudder room 7, a space 8 below the rudder room, and a stern structure 9 in order from the top on the stern side of the engine room 6. The rudder room 7 is a space for disposing a steering mechanism, a driving unit, and the like for steering the rudder 4. The rudder room lower space 8 is a space provided below the rudder room 7. The stern structure 9 is provided below the rudder room space 8 and constitutes a part of the propulsion shaft system 3. In addition, on the bow side of the engine room 6, a pump room, a filling tank, a ballast tank and the like are provided.

  As shown in FIG. 2, the space 8 under the rudder room has an inclined portion 8 a that is inclined downward from the rear end 2 a on the stern side of the hull 2 toward the bow side. Therefore, the rear end 9a of the stern structure 9 is disposed closer to the bow than the rear end 2a of the hull 2. The rear end 9a of the stern structure 9 has a shape protruding toward the stern side, and the propeller 11 of the propulsion shaft system 3 is provided at the tip of the protruding shape.

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

  The rudder 4 is a mechanism for turning the direction of the boat 1. The rudder 4 includes a rudder plate 20 and a rotating shaft 21. The rudder plate 20 is disposed below the inclined portion 8a of the space 8 below the rudder room, and is disposed at least at a position lower than the water surface when the marine vessel 1 is operating. Further, the rudder plate 20 is disposed at a position facing the propeller 11 on the stern side.

  The rudder plate 20 extends in the up-down direction while extending in the front-rear direction. The rudder plate 20 is connected to the rotating shaft 21 at the upper end 20a. The detailed structure of the rudder plate 20 will be described later. The rotation shaft 21 extends upward from the upper end 20a of the rudder plate 20. The rotation shaft 21 extends to the inside of the hull 2 through the inclined portion 8a. The rotating shaft 21 extends to the steering room 7 and is connected to a steering device 22 provided in the steering room 7. The rotation of the rotation shaft 21 can change the direction by rotating the rudder plate 20 around the rotation shaft 21.

  The steering device 22 is connected to the control unit 25. The steering device 22 rotates by the specified amount in the specified rotation direction based on the control signal from the control unit 25. When a steering operation is performed by the driver, the control unit 25 transmits a control signal including information on the rotation direction and the rotation amount based on the turning direction and the turning amount to the steering device 22.

  Next, a configuration of the rudder plate 20 according to the present embodiment will be described with reference to FIGS. FIG. 3 is a diagram of the rudder plate viewed from the front side. FIG. 4 is a diagram of the rudder plate viewed from above. As shown in FIGS. 2 to 4, the rudder plate 20 includes a wing portion 30 extending in a vertical direction, and a pair of end plates 40 provided on the wing portion 30.

  The wing portion 30 forms a main body of the rudder plate 20. The wing portion 30 has a front end 31 extending vertically in the front side, a rear end 32 extending vertically in 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 FIG. 2). Further, the wing portion 30 has side surfaces 35, 35 that extend in the up-down direction and the front-back direction (see FIGS. 3 and 4). Here, the direction perpendicular to the up-down direction and the front-back direction is referred to as “lateral direction”. The direction from the side surfaces 35 toward the center line CL (see FIG. 3) in the lateral direction of the rudder plate 20 is referred to as “inside in the lateral direction”, and the opposite side is referred to as “outside in the lateral direction”. The wing portion 30 may have a shape that draws a streamline when viewed from above and below (as shown in FIG. 4), but in the present embodiment, in order to facilitate understanding of the structure, The description will be made assuming that the rectangle is formed.

  As shown in FIG. 3, the side surfaces 35, 35 of the wing portion 30 have main surfaces 35 a, 35 a occupying substantially the entire area other than the region near the lower end 34 of the side surfaces 35, 35. Further, the side surfaces 35, 35 of the wing portion 30 have stepped portions near the lower end 34, thereby having stepped surfaces 35b, 35b and stepped bottom surfaces 35c, 35c. The step surfaces 35b, 35b extend from the lower ends of the main surfaces 35a, 35a to the inside of the wing 30 in the lateral direction. The step bottom surfaces 35c, 35c extend downward from a laterally inner end of the step surfaces 35b, 35b to the lower end 34. The main surfaces 35a, 35a and the stepped bottom surfaces 35c, 35c are formed to be substantially parallel. The horizontal dimension of the step surfaces 35b, 35b, that is, the depth of the step may be set to be substantially the same as 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 step surfaces 35b, 35b and the step bottom surfaces 35c, 35c function as a storage part 36 for storing the end plate 40.

  The end plates 40, 40 are provided movably with respect to the wing 30. The end plates 40, 40 are formed of band-shaped plate members attached to the vicinity of the lower end 34 of the wing portion 30 and extending in the front-rear direction. One end of the end plates 40, 40 in the width direction 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 approach and separate from the wing 30 as free ends 40 a, 40 a. 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 between the lower end 34 and the stepped bottom surfaces 35c, 35c. The rotation axis of the rotation unit 41 is arranged to extend in the front-rear direction. Therefore, the end plates 40, 40 rotate so that the free ends 40 a, 40 a draw an arc around the rotation axis of the rotating portion 41 when viewed from the front-back direction.

  The rudder plate 20 switches between a first state in which the end plates 40, 40 are housed in the wing portion 30 and a second state in which the end plates 40, 40 are spread from the wing portion 30. The state in which the end plates 40, 40 are housed in the wing 30 is a state in which the end plates 40, 40 are incorporated in the wing 30 as a member constituting a part of the wing 30. Therefore, in a state where 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). The function as 40 is stopped or suppressed. The state in which the end plates 40 and 40 are spread from the wing portion 30 means that the end plates 40 and 40 are arranged at a position separated from the wing portion 30 and are arranged in water as members independent from the wing portion 30. State. Therefore, in a state where the end plates 40, 40 are spread from the wing portion 30, the end plates 40, 40 have an effect on the water flow from the propeller 11 (see FIG. 2). Has been demonstrated.

  In the present embodiment, FIG. 3A shows the first state, and FIG. 3B shows the second state. In the present embodiment, the end plates 40, 40 switch between a first state arranged along the side surfaces 35, 35 of the wing 30 and a second state extending laterally from the wing 30. It is provided movably with respect to the wing 30 as possible. In addition, 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. 3A, 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 so as to extend along the side surfaces 35, 35 in a state where the main surfaces 40b, 40b and the side surfaces 35, 35 are in contact with each other so as to overlap each other. Here, the end plates 40, 40 are housed in the housings 36, 36 of the wing 30. At this time, the end plates 40, 40 function as members that fill the space of the storage sections 36, 36. The main surfaces 40b, 40b of the end plates 40, 40 are in contact with the step bottom surfaces 35c, 35c so as to overlap. The opposite main surfaces 40c, 40c are arranged so as to be exposed to water. The main surfaces 40c, 40c function as surfaces substantially continuous with the main surfaces 35a, 35a of the wing portion 30. That is, the main surfaces 40c, 40c function as a part of a region near the lower end 34 of the side surfaces 35, 35 of the wing portion 30. The free ends 40a, 40a of the end plates 40, 40 are arranged so as to face the step surfaces 35b, 35b. In this state, the end plates 40, 40 do not affect the water flow as a member that increases the resistance (or the influence is suppressed). That is, the resistance to the water flow between the rudder plate 20 in the first state and the rudder plate formed only of the wing portion 30 is substantially the same.

  As shown in FIG. 3B, in the second state, the end plates 40, 40 are arranged so as to extend from the wing portion 30 in the lateral direction. That is, the end plates 40, 40 are held at positions rotated downward by about 90 ° about the rotating parts 41, 41 from the first state. Thus, the end plates 40, 40 are deployed from the storage portions 36, 36 to the outside of the wing portion 30, and the main surfaces 40b, 40b are separated from the step bottom surfaces 35c, 35c. Thereby, both the main surfaces 40b, 40b of the end plates 40, 40 and the main surfaces 40c, 40c are arranged so as to spread horizontally in water. In the second state, the end plates 40, 40 function as members that extend the steering area with respect to the side surfaces 35, 35 of the wing 30 near the lower end 34 of the wing 30. In the second state, due to the hydrodynamic mirror effect of the end plates 40, 40, the aspect ratio of the rudder plate 20 is substantially increased as compared with the first state, and a large lift is obtained (about 3 to 10). % Increase), so the steering force increases and the ship becomes easier to maneuver.

  FIG. 4A shows the first state, and FIG. 4B shows the second state. As shown in FIG. 4, the rudder plate 20 is in the first state when the boat 1 on which the rudder board 20 is mounted goes straight, and is in the second state when the boat 1 turns. As shown in FIG. 4A, when the marine vessel 1 travels straight, it assumes a posture extending straight in the front-rear direction of the wing portion 30. Thereby, the wing portion 30 is arranged in a posture along the water flow W from the front to the rear by 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. Thereby, the rudder plate 20 can suppress the influence of the increase in the resistance to the water flow W by the end plates 40, 40, and can increase the propulsive force.

  As shown in FIG. 4 (b), when the boat 1 turns, the wings 30 rotate and assume a posture inclined with respect to the front-back direction. Thereby, the wing portion 30 is arranged in a posture inclined with respect to the water flow W. At this time, since the end plates 40, 40 are widened from the wing portion 30, the end plates 40, 40 exhibit a function of expanding the rudder area. Thus, the rudder plate 20 can increase the rudder force by the amount of the added end plates 40, 40.

  As shown in FIG. 2, the marine vessel 1 includes a drive unit 50 that switches between the first state and the second state by opening and closing the 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 machine, a hydraulic cylinder, or the like. When the drive unit 50 is an electric motor, the power source 51 is configured by a power supply, and supplies power to the drive unit 50. When the drive unit 50 is a hydraulic cylinder, the power source 51 is configured by a pump, and supplies hydraulic oil to the drive unit 50. Although the arrangement is not particularly limited, in FIG. 2, the drive unit 50 is arranged inside the wing 30 of the rudder plate 20, and the power source 51 is arranged in the steering room 7 higher than the water surface. The power source 51 supplies electric power and hydraulic oil to the drive unit 50 via electric wires and pipes passing through the inside of the rotating shaft 21. The control unit 25 can control the operation of the drive unit 50 by transmitting a control signal to the power source 51. The control unit 25 transmits a control signal to the steering device 22 when the marine vessel 1 is going straight, makes the wing 30 straight in the front-rear direction, and transmits a control signal to the power source 51, The first state is such that the end plate 40 is housed in the wing portion 30 (see FIG. 4A). The control unit 25 transmits a control signal to the steering unit 22 when the boat 1 turns, sets the wing unit 30 in the inclined state with respect to the front-rear direction, and transmits a control signal to the power source 51. Then, the end plate 40 is set to the second state in which the end plate 40 is spread from the wing portion 30 (see FIG. 4B).

  An example of a driving 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 plate using a motor. In FIG. 5, of the wings 30, only the wall constituting the lower end 34 is shown by a solid line, and the other walls are shown by phantom lines. In FIG. 5, in order to facilitate understanding of the drive mechanism, the end plate 40 is shown in a state where the thickness thereof is thin, and gaps between respective components are also shown in a state where it is greatly emphasized. 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 ends of the rotating shaft 61 are arranged inside the wing portion 30 via step surfaces 35d facing each other in the front-rear direction. A bevel gear 66 is provided at one end of the rotating shaft 61. The drive unit 50 is configured by a motor 63 arranged inside the wing unit 30. The shaft of the motor 63 extends in the lateral direction, and a bevel gear 64 is provided at the tip. The bevel gear 64 is arranged so as to mesh with the bevel gear 66 of the rotating shaft 61. Thus, the torque of the motor 63 is converted into the torque of the rotating shaft 61 via the bevel gears 64 and 66.

  When a hydraulic cylinder is employed as the driving unit 50, the shaft of the hydraulic cylinder is penetrated from the inside of the wing portion 30 to the outside from the side surface 35, and the shaft (or a link mechanism connected thereto) of the end plate 40 is used. Opening and closing may be performed.

  Next, the operation and effect of the rudder plate 20 and the boat 1 according to the present 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 up-down direction and an end plate 40 provided on the wing portion 30. And the second state in which the end plate 40 is extended from the wing portion 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 expanded, the steering force of the rudder plate 20 can be increased, and when the end plate 40 is housed in the wing portion 30, an increase in the resistance force due to the end plate 40 can be suppressed. Therefore, when the performance required of the rudder plate 20 differs depending on the situation, the rudder board 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 the present embodiment, the end plate 40 has a first state arranged along the side surface 35 of the wing 30 and a second state extending laterally from the wing 30. It is provided movably with respect to the wing portion 30 so as to be switchable. As described above, 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 housed in the wing portion 30 without providing a complicated structure for the wing portion 30. Can be. 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 housed in the wing 30 simply by arranging the end plate 40 along the wing 30. In addition, such a configuration can prevent the lowest portion (bottom portion) of the hull from being lowered as compared with a configuration in which the end plate is extended downward (the configuration illustrated in FIG. 7), and thus has an effect on draft restriction. Has no effect.

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

  In the rudder board 20 according to the present embodiment, the boat 1 on which the rudder board 20 is mounted goes into a first state when going straight, and goes into a second state when the boat 1 turns. When the marine vessel 1 is traveling straight, the rudder plate 20 is in the first state, thereby suppressing an increase in the resistance force caused by the end plate 40, thereby improving the propulsion force. On the other hand, when the boat 1 turns, the rudder plate 20 is in the second state, so that the rudder force can be improved.

  The rudder plate 20 described above is mounted on the boat 1 according to the present embodiment.

  According to the marine vessel 1, the operation and effect of the rudder plate 20 can be achieved.

  The present invention is not limited to the above embodiment.

  In the above-described embodiment, in the second state, the end plates 40, 40 are arranged so as to extend in the lateral direction. Alternatively, as shown in FIG. 6A, in the second state, the end plates 40, 40 may be arranged to extend downward. In this case, the end plates 40, 40 are arranged so as to turn the free ends 40a, 40a downward by rotating substantially 180 ° about the rotating portion 41 from the first state. Even in such a case, the end plates 40, 40 can increase the steering area of the rudder plate 20 as compared with the first state, so that the steering 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 stored in the storage portion 36 so as to be stored in the wing portion 30. Instead, as shown in FIG. 6B, a wing portion 30 having no storage portion 36 may be employed. The wing portion 30 also has main surfaces 35a, 35a near the lower end 34. 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 overlap. The end plates 40, 40 project from the main surfaces 35a, 35a by the thickness of the end plates 40, 40. Even in such a state, the resistance due to 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 portion 30.

  In the above-described embodiment, the end plates 40, 40 are in the first state arranged along the side surfaces 35, 35 of the wing 30, and in the second state extending laterally from the wing 30. , Can be switched with respect to the wing portion 30 so as to be switchable. Instead, a rudder plate 120 as shown in FIG. 7 may be employed. As shown in FIG. 7, the end plate 140 can be switched between a first state stored in the wing 130 and a second state protruding from the lower end 134 of the wing 130 and extending vertically. The wing 130 is provided so as to be movable. As shown in FIG. 7A, 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 disposed on the upper side in the internal space SP. Note that a wall 136 is provided between the hydraulic cylinder 150 and the end plate 140. The shaft 151 of the hydraulic cylinder 150 penetrates through the wall 136 in a state where the sealing performance is ensured. Thereby, 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 disposed. 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 at the lower end 134 of the wing portion 130. That is, the end plate 140 switches between the first state and the second state by sliding with respect to the wing portion 130.

  As described above, in the rudder plate according to the modified example, the end plate 140 has the first state stored in the wing part 130 and the second state protruding from the lower end of the wing part 130 and extending vertically. , Are movably provided with respect to the wing portion 130 so as to be switchable. As described above, since the end plate 140 is stored in the wing portion 130 in the first state, the influence of the resistance by the end plate 140 can be further reduced.

  In the rudder plate according to the modified example, the end plate 140 switches between the first state and the second state by sliding with respect to the wing portion 130. Thus, 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 the modified example, the driving unit that moves the end plate is provided in the wing. Instead of this, a configuration in which the drive unit is provided on the hull 2 side may be adopted. For example, a drive unit such as a steering machine or a hydraulic cylinder may be provided in the steering room 7, and the driving force of the drive 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 inside of the rotating shaft 21. Further, a conversion mechanism may be provided so that the rotational force of the steering device 22 (see FIG. 2) with respect to the rudder plate is converted into the driving force of the end plate via a link mechanism or a gear mechanism. Thereby, the end plate can be expanded at the timing when the steering gear 22 rotates the rudder plate when the boat turns.

  Further, in the above-described embodiments and modified examples, the end plate is provided only at the lower end, but an end plate may be provided at the upper end instead or in addition to this. In this case, a switching structure having the same meaning as the above-mentioned end plate may be adopted also for the end plate with respect to the upper end. Alternatively, a switching structure may be employed for only one of the upper end plate and the lower end plate.

  Further, in the above-described embodiment, the ship is a tanker, which is particularly preferable. However, the present invention is also applicable to a dual-purpose ship that can load not only oil but also solid cargo (bulk) such as ore and coal.

1 ... Ship, 20, 120 ... Rudder, 30, 130 ... Wing, 40, 140 ... End plate.

Claims (7)

Wings extending vertically,
An end plate provided on the wing portion,
A first state in which the end plate is housed in the wing,
A rudder plate for switching between a second state in which the end plate is extended from the wing portion;   The end plate is provided on the wing so as to be switchable between the first state disposed along the side surface of the wing and the second state extending laterally from the wing. The rudder plate according to claim 1, which is provided movably with respect to the rudder plate.   The rudder board according to claim 2, wherein the end plate switches between the first state and the second state by rotating with respect to the wing.   The wing section so that the end plate is switchable between the first state stored in the wing section and the second state that extends from the lower end of the wing section and extends in the vertical direction. The rudder plate according to claim 1, which is provided movably with respect to.   The rudder plate according to claim 4, wherein the end plate switches between the first state and the second state by sliding with respect to the wing.   The ship according to any one of claims 1 to 5, wherein 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 provided with a wing portion extending in a vertical direction and an end plate provided on the wing portion,
A first state in which the end plate is housed in the wing portion,
A ship switchable between a second state in which the end plate is extended from the wing.

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