KR101291138B1 - Rudder for ship and ship having the same - Google Patents

Abstract

Marine rudders and vessels having the same are disclosed. The rudder for ships according to the embodiment of the present invention is installed rotatably with respect to the hull and a rudder blade having an opening formed at the rear; First and second wings installed inside the rudder blade to allow entry and exit through the opening; It includes a wing drive device for entering and exiting the first and second wings in conjunction with the change of the steering angle.

Description

Rudder for ships and vessels equipped with the ship {RUDDER FOR SHIP AND SHIP HAVING THE SAME}

The present invention relates to a rudder for ships, and more particularly, to a rudder for ships and a ship having the same shape of the rear end to change the resistance so as to reduce the resistance when going straight and increase the lift force when turning.

A rudder is installed at the rear of the ship's propeller or the lower part of the hull to control the traveling direction. The rudder generates side force for steering control of the ship by rotating to the port or starboard side by a driving device (steering gear, etc.) inside the hull.

The cross-sectional shape of a typical rudder is a streamlined form in which both sides are symmetrical with respect to the center line in the front and rear directions. That is, the width gradually increases from the front end of the arc to the rear end, and then gradually decreases from the maximum width to the rear end. This type can reduce resistance when the ship goes straight and gain lift for maneuvering when the ship is turning.

However, the above-mentioned rudder is difficult to obtain sufficient lift for turning when the rudder angle is increased in a situation where the ship is traveling at a low speed. Therefore, research in related fields is progressing toward developing a high lift rudder that can improve turning maneuverability.

High-lift rudders are known as fish-tail rudders whose tails resemble fish tails. The fishtail rudder becomes smaller as the cross section becomes smaller and larger again toward the rear end. This is because the pressure difference between the two sides of the rudder at the rear part of the ship is increased and the lift is increased, so that the steering performance can be excellent when the ship is turning. However, in the case of the fish tail rudder has a problem that a high fluid resistance when going straight compared to the conventional rudder due to its shape.

Embodiments of the present invention are to provide a ship rudder and a ship having the same to reduce the resistance to the fluid when the ship is going straight and to improve the turning control performance by lifting the lift when turning.

According to an aspect of the present invention, a rudder blade rotatably installed with respect to the hull and having an opening formed at its rear end; First and second wings installed inside the rudder blade to allow entry and exit through the opening; A rudder for a ship may be provided that includes a wing driving device for allowing the first and second wings to move in and out in response to a change in the steering angle.

The first and second wings may enter the rudder blade when the ship goes straight, and may protrude to both sides through the opening when the rudder angle increases when the ship turns.

The first and second wings may maintain an inclination with respect to the center line in the front and rear directions of the rudder blade in the state protruding to the outside of the rudder blade.

The rudder blade may include a protruding guide portion provided at a rear end thereof so that the first and second wings may protrude inclined with respect to the center line in the front and rear directions of the rudder blade.

The rudder blade supports the slanted shape of the rudder blade when the first and second blades protrude outwardly from the rudder blade and is inclined with respect to the center line in the forward and backward directions and when the first and second blades enter the rudder blade. It may include a protrusion guide for maintaining.

The rudder blade may further include an opening and closing member provided in each opening so that the opening width can be varied when the first and second blades enter and exit.

The rudder further includes a fixing part disposed above the rudder blade and fixed to the hull; The wing drive device includes a retraction member having a protrusion installed to be moved back and forth in the rudder blade and protruding upward from the rudder blade, and at least one connection part rotatably connected to the front end of the first and second blades; It may include a retraction guide groove formed in the fixing portion to cause the retraction of the retraction member by moving the protrusion in accordance with the change in the angle of view.

The retreat guide groove may be a V-shaped groove that is open at both sides of the fixing portion for access to the protrusion.

The retreat guide groove may be provided with a seating portion for preventing the movement of the protrusion when going straight.

The wing drive device may further include a pressing member for pressing the retracting member to protrude the first and second wings.

The wing driving device may further include a guide member extending in a forward and backward direction in a state connected to the retraction member for guiding the retraction member and slidably supported in the rudder blade.

The wing drive device is provided in the rudder blade to be moved forward and backward and forward and backward rotatably connected to the front end of the first and second blades; It may include one or more hydraulic cylinders for advancing and retracting the retracting member.

The openings are formed in pairs at opposite positions of both sides of the rear side of the rudder blade, and each of the first and second blades may enter and exit the rudder blade through each of the pair of openings.

The first and second wings may protrude outwards through the opening, and may have a cross-sectional shape in the form of a fish-tail.

The opening may be formed in a singular stage at the rear of the rudder blade, and the first and second blades may enter and exit the rudder blade through the single opening.

In the ship rudder according to the embodiment of the present invention, when the ship goes straight, the first wing and the second wing enter the rudder blade, and when the ship turns, the first wing and the second wing are outside of the rudder blade. As it is protruded into a fish-tail type, it can minimize the resistance to fluid when the ship goes straight and can improve the ship's turning ability by increasing lift force when turning.

1 shows a rudder for ships according to a first embodiment of the present invention.
2 is a perspective view of a rudder for ship according to a first embodiment of the present invention.
Figure 3 is a perspective view of the wing drive device of the rudder for ships according to the first embodiment of the present invention.
Figure 4 is a cross-sectional view of the rudder for ships according to the first embodiment of the present invention, showing a state when the ship goes straight.
5 is a cross-sectional view of the rudder for ships according to the first embodiment of the present invention, showing a state when the ship is turning.
6 is a cross-sectional view of the rudder for ships according to the second embodiment of the present invention, showing a state when the ship goes straight.
7 is a cross-sectional view of the rudder for ships according to the second embodiment of the present invention, showing a state when the ship is turning.
Figure 8 shows a rudder for ships according to a third embodiment of the present invention.
9 is a cross-sectional view of the rudder for ships according to the third embodiment of the present invention, showing a state when going straight to the ship.
10 is a cross-sectional view of the rudder for ships according to the third embodiment of the present invention, showing a state when the ship is turning.
11 is a cross-sectional view of the rudder for ships according to the fourth embodiment of the present invention, showing a state when the ship goes straight.
12 is a cross-sectional view of the rudder for ships according to the fourth embodiment of the present invention, showing a state when the ship is turning.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 5 show a ship rudder according to a first embodiment of the present invention.

As shown in FIG. 1, the rudder 10 of the first embodiment may be installed at the rear of the propeller 3 provided at the rear of the hull 1 of the ship. Since the rudder 10 may be installed at another position under the hull 1 according to the type or purpose of the ship, the installation position is not limited thereto.

1 and 2, the rudder 10 has a fixed part 20 fixed to the rear of the hull 1 and a rudder blade installed to be rotatable in the port or starboard direction below the fixed part 20 ( 30).

2 and 4, the rudder blade 30 is symmetrical with respect to both sides of the cross-sectional shape with respect to the center line X in the forward and backward directions. That is, the width of the cross section gradually increases from the front end 30a of the arc shape toward the rear end 30c, and the cross section width gradually decreases from the maximum width portion 30b toward the rear end 30c.

In addition, the rudder blade 30 is coupled to the rotating shaft 11 extending downward through the fixing part 20 from the inside of the hull 1, as shown in FIG. The rudder blade 30 is a drive device (steering gear, etc.) installed inside the hull 1 rotates to the port or starboard side by rotating the rotary shaft 11, through which the side force for turning control of the hull 1 (Side) Force).

The fixing part 20 occupies a space between the rudder blade 30 and the hull 1 and has a cross-sectional structure similar to that of the rudder blade 30. This protects the rotating shaft 11 by preventing sea water from flowing into the upper region of the rudder blade 30 on which the rotating shaft 11 is installed, and stably supports the rotating shaft 11 so that the operation of the rudder blade 30 is smooth. To be done. This is also called the Ruther trunk.

In addition, the rudder blade 10 of the first embodiment, as shown in Figs. 2 to 4, through the openings (31a, 31b) provided on each side of the rear side of the rudder blade 30, the rudder blade 30 Wing driving device 50 for operating the first blade 41 and the second blade 42 in conjunction with the change of the first blade 41 and the second blade 42, and the angle (Rudder Angle) installed therein) ).

As shown in FIG. 3, the first wing 41 and the second wing 42 are provided in the form of a flat plate having a long length in the vertical direction. And the wing drive device 50 for operating the first and second blades (41, 42) is installed in the rudder blade 30 to be moved back and forth and the operation having a protrusion 52 protruding above the rudder blade (30). Bars 51 and a plurality of connecting parts 53 extending from the operating bar 51 toward the first and second blades 41 and 42 so as to be rotatably connected to the front ends of the first and second blades 41 and 42. And a retraction member 54 including a). In addition, the retraction guide groove 21 is provided in the fixed portion 20 to cause the retraction of the retraction member 54 by moving the protrusion 52 when the steering angle is changed.

As shown in FIG. 3, a guide member 55 may be installed at the upper and lower portions of the retraction member 54 to guide the forward and backward movement of the retraction member 54. These guide members 55 extend in the front-rear direction from the operation bar 51 and may be slidably supported by the guide rails 56 provided in the rudder blade 30. This is because two guide members 55 long in the front and rear direction are slidably supported in the rudder blade 30 so that the forward and backward movement of the retreat member 54 can be smoothly performed. In addition, the upper portion of the rudder blade 30 may be provided with a guide groove 57 for guiding forward and backward movement of the protrusion 52 as shown in FIGS. The guide groove 57 guides the forward and backward movement of the protrusion 52 of the operation bar 51, and guides the forward and backward movement of the advance and exit member 54 together with the guide rail 56 and at the same time, the advance and exit member 54. It can also function to limit the forward and backward movement range.

At least one of the protrusion and the guide groove may be provided with a sealing member (not shown) to prevent the sea water from flowing into the rudder blade through the guide groove. The sealing member (not shown) may maintain the watertightness of the guide groove regardless of the movement of the protrusion as an example of the corrugated elastic plate. In addition, various types of sealing members may be provided for watertight between the movable body and the slit-shaped guide groove.

As shown in FIG. 3, the plurality of connection parts 53 may have a flat plate shape extending from the operation bar 51 toward the first and second wings 41 and 42, and the rear ends thereof may include the first wings 41. ) And the second blade 42 may be rotatably connected by the pin 43. Here, although a form employing a plurality of connecting parts 53 is illustrated for stable connection, the connecting parts 53 do not necessarily need to be plural. It is also possible to connect the operation bar 51 and the first and second blades 41 and 42 by one connection part 53. In addition, in the present embodiment, the retraction member 54 has been shown to include a working bar 51 and a plurality of connecting portions 53, but the retraction member 54 is slidably supported back and forth within the rudder blade 30. Since the first and second wings 41 and 42 may be in the form that can be moved forward and backward, the form is not necessarily limited thereto. It may be changed in various forms, such as consisting of a panel as a whole.

In the rudder blade 30, at least one pressing member 58 for protruding the first and second blades 41 and 42 by pressing the retreating member 54 toward the rear end of the rudder blade 30 is provided. These pressing members 58 press the advance member 54 so that the first and second blades 41 and 42 protrude and spread as shown in FIG. 5, and maintain the pressure of the advance member 54. Two blades (41, 42) to maintain the state protruding to both sides of the rudder blade 30. The pressing member 58 may be in the form of a compression spring, in which the inside of the rudder blade 30 has a shape corresponding to the pressing member 58 to prevent buckling during compression and restoration of the pressing member 58. A space may be formed to accommodate the pressing member.

At the rear of the rudder blade 30, the first and second wings 41 and 42 protruding through the openings 31a and 31b on both sides are inclined with respect to the center line X in the front and rear directions of the rudder blade 30. The protrusion guide part 32 is provided to guide the protrusion of the first and second wings 41 and 42 so as to protrude while being unfolded. The protruding guide portion 32 has inclined guide surfaces 32a and 32b on both sides thereof to guide the unfolding of the first and second wings 41 and 42, respectively. In addition, the cross-sectional shape is a triangular shape extending in the vertical direction, the upper and lower ends are connected to the upper and lower portions of the rudder blade 30.

Opening and closing members 33a and 33b in the openings 31a and 31b at both rear ends of the rudder blade 30 to vary the width of the openings 31a and 31b when the first and second wings 41 and 42 enter and exit. ) Can be installed. These opening and closing members 33a and 33b are rotatably coupled to both side surfaces of the rudder blade 30. In addition, a torsion spring 33c for rotating the opening and closing members 33a and 33b in a normally closed direction may be installed at a portion to which the opening and closing members 33a and 33b are connected.

This is because the opening and closing members 33a and 33b of both sides are opened while the first and second blades 41 and 42 protrude from the state of FIG. 4 to the state of FIG. 5, thereby increasing the width of the openings 31a and 31b. The first and second blades 41 and 42 can easily protrude, and after the protrusion, the widths of the openings 31a and 31b can be narrowed again. The same is true when the first and second wings 41 and 42 enter the inside of the rudder blade 30.

2 and 4, the advance guide groove 21 is formed on the lower surface side of the fixing portion 20 to enter the projection 52 protruding to the upper portion of the rudder blade 30. In addition, as shown in Figure 4, the retreat guide groove 21, both sides and the rear end of the fixing portion 20 from the position where the projecting portion 52 in the state of moving forward meets the center line in the front and rear direction of the fixing portion 20 It extends in the inclined direction to form a V-shaped groove as a whole. In addition, as shown in Figure 5, when the rudder angle increases both sides of the fixing portion 20 is open so that the protrusions 52 can be separated from the advance guide groove 21. A seating portion 21b may be formed inside the advance guide groove 21 to stably support the movement of the protrusion 52 when the rudder angle is 0 degrees. The seating portion 21b is formed in a shape corresponding to the outer surface of the protrusion 52 so that when the rudder angle is 0 degrees, the protrusion 52 can be stably positioned at the center of the advance guide groove 21 so that the first and second End portions of the blades 41 and 42 may be prevented from protruding outside the rudder blade 30.

As shown in FIG. 4, when the rudder angle is 0 degrees, the protrusion 52 of the retreating member 54 is positioned at the seating portion 21b of the retreating guide groove 21. The first and second wings 41 and 42 enter the inside of the rudder blade 30 and are provided in a folded state. And when the rudder blade 30 is rotated to the port or starboard side, the rudder angle is increased, as shown in Figure 5, the projection 52 is moved toward the rear end of the rudder blade 30 along the advance guide groove 21, The first and second blades 41 and 42 protrude outward from the rudder blade 30 to be unfolded. Of course, in this case, since the pressing member 58 inside the rudder blade 30 presses the operation bar 51 of the retracting member 54 to the rear of the rudder blade 30, the first and second blades 41 and 42 are Easily protrudes.

As shown in FIG. 5, after the first and second wings 41 and 42 protrude and extend through the openings 31a and 31b of the rudder blade 30, the pressing member 58 is operated by the operation bar 51. Since the state is continuously pressed, the retracted state of the protrusion 52 is maintained so that the unfolding of the first and second wings 41 and 42 may be maintained. That is, due to the unfolded two wings (41, 42) the cross-sectional shape of the rear blade rudder blade 30 forms a fish-tail (Fish-tail) form. In this state, when the rudder blade 30 is rotated in a direction in which the rudder angle is further increased, the protrusions 52 are separated from the retreating guide grooves 21 through the openings 21a on the side of the fixing part 20, so that the first and the first The two blades (41, 42) is in the unfolded state the rudder blade 30 is operated.

When the rudder angle decreases from the state of FIG. 5 to the state of FIG. 4, the projection 52 enters the opening 21a of the advance guide groove 21 again, and the pressing member 58 of which the operating portion 51 is an elastic member. ), The advancing member 54 moves forward of the rudder blade 30.
Since the rotational force applied from the rotating shaft 11 to the rudder blade 30 is sufficiently larger than the force that the pressing member 58 presses the operating portion 51 backward, the operating portion 51 causes the pressing member to decrease when the steering angle is reduced. While compressing the 58, the projection 52 can move along the advance guide groove 21 to return to the seating portion 21b. Therefore, in this case, since the advancing member 54 moves forward of the rudder blade 30, the first and second blades 41 and 42 enter the inner side of the rudder blade 30, so that the cross-sectional shape of the rudder blade 30 is increased. The whole is streamlined.

On the other hand, as shown in Figure 4, when the ship goes straight (when the rudder angle is 0 degrees), since the fluid flow characteristics of both sides of the rudder blade 30 is substantially the same level, almost no lift force affecting the ship's turning occurs. I never do that. In this case, since the first and second wings 41 and 42 enter the inside of the rudder blade 30, the cross-sectional shape of the rudder blade 30 maintains a streamline shape as a whole. Therefore, the resistance to the fluid can be minimized. At this time, although the protrusion guide portion 32 is present at the rear of the rudder blade 30, the protrusion guide portion 32 is small in size and thus does not affect the fluid flow of the surroundings.

As shown in FIG. 5, the rudder blade 30 is rotated to increase the rudder angle α, and the first blade 41 and the second blade 42 protrude out of the rudder blade 30 to have a fish tail type. If it is changed to, the lifting force is generated in the direction of arrow F and the ship turns. At this time, the first blade 41 located at the rear side of the pressure blade of the rudder blade 30 increases the lifting force of the vessel by changing the flow direction of the fluid on the rear side of the pressure surface.

In addition, in the state of FIG. 5, the second blade 42 located at the rear of the suction surface of the rudder blade 30 generates a vortex (V, Vortex) flow at the deflection portion behind the suction surface. In the conventional case, the vortex may act as a resistance, but the vortex V is formed on the rear side of the rudder blade 30 so as not to directly disturb the flow of the fluid near the suction surface, but rather to the second wing 42. By causing the fluid flowing nearby to flow over and back naturally, it delays the flow detachment that may occur at the rear of the rudder blade 30. The phenomenon of delayed flow peeling has an effect similar to that of increasing the cross-sectional area by lengthening the length of the rudder blade 30, thereby helping to increase the turning performance of the ship.

As described above, the rudder 10 of the first embodiment is delayed due to the action of the first blade 41 and the second blade 42, and thus a high lift force can be generated even at a large rudder angle. It can greatly improve your ability to turn. 5 shows a state in which the Rutherblade 30 rotates to the starboard side. Although not shown in the figure, when the rudder blade 30 rotates to the port side, it can operate in the same manner and the same effect can be obtained.

6 and 7 show a rudder according to the second embodiment. In the second embodiment, the rudder blade 130 may maintain a streamline in which the rear end of the protrusion guide 132 is associated with both sides of the rudder blade 130. As shown in FIG. 6, in the state where the first and second wings 141 and 142 enter the inside of the rudder blade 130 (when the rudder angle is 0 degrees), the tail of the rudder blade 130 maintains a completely streamlined shape. This is to minimize the resistance of the fluid. Retreat guide groove 121 provided in the fixing part 120, the wing drive device 150 is installed on the rudder blade 130, the first and second wings (141, 142), formed on both sides of the rear of the rudder blade 130 The openings 131a and 131b and the opening and closing members 133a and 133b may be provided in substantially the same manner as in the first embodiment.

8 to 10 show the rudder according to the third embodiment. In the third embodiment, the wing drive device 250 includes the first wing 241 and the second wing 242, the retraction member 254 installed in the rudder blade 230 to advance and retreat these two wings 241 and 242, and the retreat. At least one hydraulic cylinder 255 installed in the rudder blade 230 to advance and retract the member 254. Here, although the case of employing two hydraulic cylinders 255 on the upper side and the lower side is presented, the hydraulic cylinder 255 may be composed of one or three or more. The retraction member 254 and the first and second wings 241 and 242 may be configured in substantially the same manner as in the first embodiment.

Although not shown in the drawings, a hydraulic generator (hydraulic pump, etc.) for the operation of the hydraulic cylinder 255 may be installed in the hull 1 of the ship, the hydraulic generator and the hydraulic cylinder 255 is a rotating shaft 11 It can be interconnected by a pipe 256 through. In addition, the operation of the hydraulic generator for operating the hydraulic cylinder 255 can be controlled with the operation of the ship steering device.

This causes the hydraulic cylinder 255 to retreat the retraction member 254 to operate the first and second wings 241 and 242 according to the change of the steering angle. That is, as shown in FIG. 9, the hydraulic cylinder 255 may be operated so that the first and second wings 241 and 242 enter the rudder blade 230 when the ship goes straight (zero angle). And, as shown in Figure 10, when the rudder angle increases for the ship's turning, the hydraulic cylinder 255 can push the first and second wings (241,242) to protrude rearward to increase the lift for turning control of the ship have.

11 and 12 show the rudder according to the fourth embodiment. The rudder of the fourth embodiment is installed in the rudder blade 330 to allow entry and exit through the rudder blade 330 having one opening 331 formed at its rear end and the opening 331 at the rear end of the rudder blade 330. And a first blade 341 and a second blade 342 that are bent in opposite directions to each other, and a wing driving device 350 for entering and exiting the first and second blades 341 and 342 in association with a change in the rudder angle.

The wing drive device 350 is a forward and backward member 354 installed in the rudder blade 330 to be moved forward and backward, one end of which is rotatably connected to the front end of the first wing 341, and the other end of the forward and backward member 354. A first connection member 356 rotatably connected to one side of the second connection, one end of which is rotatably connected to the front end of the second blade 342, and a second connection of which the other end is rotatably connected to the other side of the retraction member 354 The member 357 may include one or more hydraulic cylinders 355 for advancing and retracting the member 354. Here, although the form employing the hydraulic cylinder 355 to the wing drive device 350 is shown, the wing drive device 350 may also be configured in the same form as the first embodiment. In addition, the drive source of the wing drive device 350 may be implemented as a feed screw connected to the retraction member 354 and a motor for rotating the feed screw.

As illustrated in FIGS. 11 and 12, the first wing 341 and the second wing 342 may be curved in an arcuate shape with an inner surface and an outer surface thereof, and their outer curved surfaces may be in contact with each other. Can be deployed. In addition, curved guide parts 332 and 333 corresponding to inner surfaces of the first and second blades 341 and 342 may be provided at both sides of the inner blade 330 adjacent to the rear opening 331.

This configuration allows the curved guides 332 and 333 on both sides to guide the entrance and exit when the first and second blades 341 and 342 protrude to the rear or enter the rear of the rudder blade 330 by the operation of the hydraulic cylinder 355. It would be. In addition, as shown in Figure 12, when the first and second wings (341, 342) protrudes to the rear of the rudder blade 330 is to be opened to a fish-tail (Fish-tail) type.

In the fourth embodiment, as the first and second wings 341 and 342 enter the inside of the rudder blade 330 when the ship goes straight, the rudder blade 330 may maintain the streamline as a whole. Therefore, the resistance to the fluid can be minimized.

As the rudder angle increases, as illustrated in FIG. 12, the first blade 341 and the second blade 342 protrude toward the rear of the rudder blade 330 and are unfolded into a fish-tail type at the same time. As a result, the lift can be increased to increase the ship's turning capacity. In particular, since the first and second wings 341 and 342 protruding to the rear side have an effect of extending the front and rear lengths of the rudder blades 330, the lifting force for turning the ship can be further increased.

10: rudder, 11: axis of rotation,
20: fixed part, 21: advance guide groove,
30: Rutherblade, 31a, 31b: opening,
32: protrusion guide, 41: the first wing,
42: second wing, 50: wing drive,
51: operating bar, 52: protrusion,
53: connecting portion, 58: pressing member.

Claims (16)

A rudder blade rotatably installed with respect to the hull and having an opening formed at its rear end;
First and second wings installed inside the rudder blade to allow entry and exit through the opening;
A rudder for a ship comprising a wing drive device for entering and exiting the first and second wings in association with a change in the steering angle. The method of claim 1,
The first and second wings enter the rudder blade when the ship goes straight, and the ship rudder protruding to both sides through the opening when the rudder angle increases when the ship turns. The method of claim 2,
The first and second wings of the ship rudder to maintain the inclination with respect to the center line in the forward and backward direction of the rudder blade blades. The method of claim 3,
The rudder blade includes a rudder guide portion provided on the rear side of the rudder blade so that the first and second wings may protrude inclined with respect to the center line in the forward and backward directions of the rudder blade. The method of claim 2,
The rudder blade supports the slanted shape of the rudder blade when the first and second blades protrude outwardly from the rudder blade and is inclined with respect to the center line in the forward and backward directions and when the first and second blades enter the rudder blade. The rudder for ships comprising a protrusion guide for maintaining the. The method of claim 1,
The rudder blade further comprises an opening and closing member provided in each opening so that the opening width is variable when the first and second blades enter and exit. 7. The method according to any one of claims 1 to 6,
A fixing part disposed on the rudder blade and fixed to the hull;
The wing drive device includes a retraction member having a protrusion installed to be moved back and forth in the rudder blade and protruding upward from the rudder blade, and at least one connection part rotatably connected to the front end of the first and second blades;
And a retreat guide groove formed in the fixing portion to cause retraction of the retraction member by moving the protrusion in accordance with the change of the steering angle. The method of claim 7, wherein
The retreat guide groove is a rudder for ships, characterized in that the V-shaped grooves respectively open to both sides of the fixing portion for access to the protrusion. The method of claim 7, wherein
The retreat guide groove is a ship rudder provided with a seating portion for preventing the movement of the protrusion when going straight. The method of claim 7, wherein
The wing drive device further comprises a pressing member for pressing the retracting member to protrude the first and second wings. The method of claim 7, wherein
The wing drive device further includes a guide member which extends back and forth in a state connected to the retraction member for guiding the retraction member and is slidably supported in the rudder blade. 7. The method according to any one of claims 1 to 6,
The wing drive device is provided in the rudder blade to be moved forward and backward and forward and backward rotatably connected to the front end of the first and second blades;
A rudder for ships comprising one or more hydraulic cylinders for advancing and retracting the retracting member. The method of claim 1,
The openings are formed in pairs at opposing positions on both sides of the rear side of the rudder blade,
And each of the first and second wings passes in and out of the rudder blade through each of the pair of openings. The method of claim 1,
When the first and second wings protrude outward through the opening,
The rudder rudder cross-sectional shape is changed to a fish-tail (fish-tail) form. The method of claim 1,
The openings are provided in singular forms on both sides of the rear blade blade,
The first and second wings are the ship rudder to enter and exit the rudder blade through the opening. A ship comprising a rudder according to any one of claims 1 to 6 and 13 to 15.

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