WO2020017069A1

WO2020017069A1 - Ship

Info

Publication number: WO2020017069A1
Application number: PCT/JP2018/039400
Authority: WO
Inventors: 信玄武田; 日向　泰彦
Original assignee: 三菱造船株式会社
Priority date: 2018-07-20
Filing date: 2018-10-23
Publication date: 2020-01-23
Also published as: JP7195795B2; CN112424062A; KR102484031B1; JP2020011690A; KR20210020142A; CN112424062B

Abstract

A ship (1C) is provided with: a main ship body (11C); a propulsion mechanism for generating propulsive force for propelling the main ship body (11C); a hydrofoil mechanism (70) having struts (73, 75) which are affixed to the main ship body (11C) and which extend downward, and also having wing bodies (74, 76) provided to the lower portions of the struts (73, 75); floats (15C) provided independently of both the main ship body (11C) and the hydrofoil mechanism (70); and movement mechanisms (50C) for connecting the main ship body (11C) and the floats (15C) and vertically moving the floats (15C) relative to the main ship body (11C).

Description

Ship

The present invention relates to a ship.
Priority is claimed on Japanese Patent Application No. 2018-137047 filed on July 20, 2018, the content of which is incorporated herein by reference.

Patent Document 1 discloses a ship including a hull and floats provided on both sides of the hull and capable of moving up and down with respect to the hull. This ship has a support rod below the float and fins provided at the lower end of the support rod. By raising and lowering the float in such a configuration, the height position of the hull with respect to the water surface can be constantly maintained at all times when the ship is stopped or during navigation. Further, by adjusting the amount of tilting of the fins, this boat can make fine adjustments to the buoyancy of the hull and the sway of the hull during navigation.

JP-A-4-133893

However, in the configuration disclosed in Patent Literature 1, the support rod and the fin are provided below the float. Therefore, when the depth of the float submerging in the water is increased in order to reduce the draft of the hull when the water depth is shallow, the fins provided below the float may interfere with the water bottom.
In addition, the ship disclosed in Patent Document 1 includes a support rod and fins on a float that can move up and down with respect to the hull. Therefore, it is necessary to provide a hydraulic system or an electric system for adjusting the amount of tilt of the fins between the hull and the float. Since the float is provided so as to be able to move up and down with respect to the hull, it is necessary that the hydraulic system and the electric system have a configuration that can cope with the float moving operation. As a result, the structures of the hydraulic system and the electric system become complicated.
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a ship capable of suppressing a hindrance to navigation even when the water depth is shallow, and simplifying the structure. .

The present invention employs the following means in order to solve the above problems.
According to the first aspect of the present invention, a ship includes a main hull, a propulsion mechanism that generates a propulsion force for propelling the main hull, a support portion fixed to the main hull and extending downward, and the support portion. A hydrofoil mechanism having a wing body provided at a lower portion of the main hull, a float provided independently of the main hull and the hydrofoil mechanism, and connecting the float and the main hull to the main hull. A moving mechanism for relatively moving the float in the vertical direction.

In the first aspect, when the float is moved relative to the main hull in the vertical direction with respect to the main hull, and the float sinks below the water surface, the draft of the main hull changes. Lowering the float relative to the main hull and increasing the amount of submergence of the float below the surface of the water increases the buoyancy generated by the float and reduces the draft of the main hull. Thereby, even in a shallow water area, a part of the bottom of the ship can be prevented from interfering with the water bottom. In addition, by moving the float up and down with respect to the main hull, the draft of the main hull can be adjusted with respect to the quay, so that getting on and off the boat can be easily performed.
The hydrofoil mechanism is provided on the main hull. Accordingly, when the float is relatively moved in the vertical direction with respect to the main hull, the hydrofoil mechanism moves up and down together with the main hull. Therefore, even if the float is lowered with respect to the main hull in a shallow water area, the hydrofoil mechanism can be prevented from interfering with the water bottom. Further, the hydrofoil mechanism need not be moved up and down with respect to the main hull together with the float. Therefore, even when the hydraulic system or the electric system is provided in the hydrofoil mechanism, the structure can be prevented from becoming complicated.

According to the second aspect of the present invention, the wing body according to the first aspect is provided so as to be submerged below the water surface, and generates a lift force for lifting the main hull during navigation by the propulsion generated by the propulsion mechanism. It may be.
With this configuration, when navigation is performed by the propulsion generated by the propulsion mechanism, the main hull floats due to the lift generated by the wings, and water resistance by the main hull can be suppressed. In such a ship, by lowering the float with respect to the main hull in a shallow water area, it is possible to effectively prevent the main hull and the hydrofoil mechanism from interfering with the water bottom.

According to the third aspect of the present invention, in the ship according to the second aspect, when the wing body is generating the lift force for floating the main hull, the moving mechanism moves the float above the water surface. May be located.
With this configuration, the ship becomes a so-called hydrofoil ship if the float is positioned above the water surface when the main hull is floating due to the lift generated by the wings during navigation. As a result, the resistance of water caused by the main hull and the float during navigation is reduced, so that comfortable navigation with higher speed and less shaking can be performed.

According to a fourth aspect of the present invention, in the boat according to any one of the first to third aspects, the float may have a drainage amount.
Since the float has the drainage amount, the drainage amount of the main hull is suppressed, and the size of the main hull can be reduced.

船舶 According to the above-mentioned ship, even when the water depth is shallow, it is possible to suppress a trouble in navigation and to simplify the structure.

It is a side view showing the whole ship composition in a first embodiment of the present invention. It is the front view which looked at the ship in the first embodiment of the above-mentioned ship from the bow side. It is a side view showing the state where the float was lowered and the draft of the main hull part was made shallow in the ship in a first embodiment of the above-mentioned ship. It is a front view showing a state where a float was lowered and a draft of a main hull part was made shallow in a ship in a first embodiment of the above-mentioned ship. It is a front view which shows the whole structure of the ship in the modification of 1st embodiment of the said ship. It is a front view showing the state where the float was lowered and the draft of the main hull part was made shallow in the vessel in a modification of a first embodiment of the above-mentioned vessel. It is a side view showing the whole ship composition in a second embodiment of this invention. It is the front view which looked at the ship in the second embodiment of the above-mentioned ship from the bow side. It is a front view showing the state where the float was raised and the draft of the main hull part was made deep in the vessel in a second embodiment of the above-mentioned vessel. It is a front view showing the state where the float was lowered and the draft of the main hull part was made shallow in the ship in a second embodiment of the above-mentioned ship.

Hereinafter, a ship according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a side view showing the overall configuration of a ship according to the first embodiment of the present invention. FIG. 2 is a front view of the ship in the first embodiment of the ship as viewed from the bow side. FIG. 3 is a side view showing a state in which the float is lowered and the draft of the main hull is made shallow in the marine vessel according to the first embodiment of the marine vessel. FIG. 4 is a front view showing a state in which the float is lowered and the draft of the main hull is made shallow in the marine vessel according to the first embodiment of the marine vessel.

As shown in FIGS. 1 and 2, the boat 1A of this embodiment includes a hull 10A, a propulsion mechanism 20, a hydrofoil mechanism 30, and a moving mechanism 50A.
The hull 10A includes a main hull 11A and a float 15A.
The main hull 11A has a hull main body 12 and a main body 13. The hull main body 12 has a pair of side sides 12s on both sides in the ship width direction. The hull main body 12 includes an upper structure 12t at an upper portion thereof. The main body 13 is provided at the center of the hull main body 12 in the boat width direction. The main body 13 protrudes downward from the lower surface 12 b of the hull main body 12. The main body 13 is continuous in the bow direction of the main hull 11A.

The floats 15A are provided on both sides of the hull body 12 in the width direction of the boat. Each of the floats 15A is provided on the main body 13 at intervals on both sides in the boat width direction. Each float 15A is disposed below the lower surface 12b of the hull main body 12. The float 15A is continuous in the bow direction of the main hull 11A. Each float 15A is provided independently of the main hull 11A and the hydrofoil mechanism 30.

The float 15A has a hollow structure and a drainage amount. That is, the float 15A is responsible for a part of the total displacement of the hull 10A. Such a float 15A is formed of, for example, FRP (fiber reinforced plastic) or the like. The float 15A is vertically movable relative to the main hull 11A by a moving mechanism 50A described later.
A hull 10A exemplified in this embodiment forms a trihull (multihull) by including a main body portion 13 at a center portion in the ship width direction and floats 15A on both sides in the ship width direction.

The propulsion mechanism 20 generates a propulsion force for propelling the main hull 11A. The propulsion mechanism 20 includes, for example, a screw 21. The screw 21 is provided below the bottom 13b of the stern 13A of the main body 13. The screw 21 is provided integrally with one end of the screw shaft 22. The screw shaft 22 is connected to a main machine (not shown) provided in the main body 13. The main engine (not shown) rotationally drives the screw shaft 22 and the screw 21 around their central axes. The propulsion mechanism 20 generates a propulsion force of the main hull 11A (the hull 10A) by rotating the screw 21.

The hydrofoil mechanism 30 is provided on the main hull 11A. The hydrofoil mechanism 30 is provided, for example, below the bottom 13 d of the bow 13 C of the main body 13. The hydrofoil mechanism 30 includes a strut (support portion) 31 and a wing body 32. The strut 31 is fixed to the main hull 11A and extends downward. The strut 31 may be rotatable around a central axis extending in the vertical direction. The wing body 32 is provided below the strut 31. The inclination angle of the wing body 32 can be changed around a pivot (not shown) provided on the strut 31. Such a hydrofoil mechanism 30 adjusts the attitude of the hull 10A by adjusting the direction and the inclination angle of the wing body 32.

The moving mechanism 50A connects each float 15A to the main hull 11A. As shown in FIGS. 3 and 4, the moving mechanism 50A moves each float 15A vertically relative to the main hull 11A. The moving mechanism 50A includes, for example, a guide member (not shown) and a hydraulic cylinder 51. A guide member (not shown) guides the float 15A so as to be relatively movable up and down with respect to the main hull 11A. The hydraulic cylinders 51 are provided, for example, at a plurality of positions spaced apart in the bow direction in each float 15A. The base end of each hydraulic cylinder 51 is fixed to the lower surface 12b on both sides of the hull body 12 in the boat width direction. The lower end of the hydraulic cylinder 51 is connected to the upper surface of the float 15A. The hydraulic cylinder 51 is driven to expand and contract downward by hydraulic pressure. As shown in FIG. 1, when the hydraulic cylinder 51 is contracted, the hydraulic cylinder 51 is housed in the hull body 12 or the float 15A. As shown in FIGS. 3 and 4, when each hydraulic cylinder 51 is extended from a contracted state, the float 15A is guided by a guide rail (not shown) and is separated from the main hull 11A (main body 13). Move relative to the direction you want. As shown in FIGS. 1 and 2, when each hydraulic cylinder 51 is contracted from the extended state, the float 15A relatively moves in a direction approaching the main hull 11A (main body 13).
This embodiment exemplifies a case where the lower end of the bottom surface 15b of the float 15A is positioned at the same height as the lower end of the bottom surface 11b of the main hull 11A when the hydraulic cylinder 51 is in the most contracted state. Further, in this embodiment, the case where the float 15A projects below the lower end of the bottom surface 11b of the main hull 11A with the hydraulic cylinder 51 extended most is illustrated.

船舶 In such a ship 1A, during normal navigation, the hydraulic cylinder 51 of the moving mechanism 50A is contracted, and each float 15A is arranged at a position close to or in contact with the lower surface 12b of the hull main body 12 of the main hull 11A. Accordingly, the boat 1A during normal navigation can stably navigate with the main body 13 and the floats 15A on both sides in the boat width direction landing thereon.

船舶 In addition, when the water depth is shallow, the marine vessel 1A extends the hydraulic cylinder 51 of the moving mechanism 50A, and relatively moves each of the floats 15A so as to be separated downward from the main hull 11A. Then, the amount of settlement of the floats 15A on both sides in the ship width direction below the water surface Wf increases. Thereby, the buoyancy generated in the float 15A increases. As a result, the main hull 11A rises with respect to the water surface Wf, and the draft of the main hull 11A becomes shallower.

Accordingly, according to the boat 1A of the above-described first embodiment, the float 15A relatively moves up and down with respect to the main hull 11A by the moving mechanism 50A. Thereby, the amount of settlement of the float 15A below the water surface can be changed by the moving mechanism 50A, and the draft of the main hull 11A can be changed. When the float 15A is lowered with respect to the main hull 11A, the buoyancy generated by the float 15A increases, and the draft of the main hull 11A becomes shallower. This can prevent a part of the ship 1A from interfering with the water bottom Wb when navigating in a shallow water area, entering a port, entering a dog, or the like. Further, at the time of docking in the dog, the bottom surface of the main body portion 13, the screw 21 and the like can be raised above the water surface Wf to facilitate maintenance work. Further, as shown in FIG. 4, the freeboard (height above the water surface) of the main hull 11A can be adjusted with respect to the quay 100 by vertically moving the float 15A with respect to the main hull 11A. Getting on and off to 1A can also be easily performed.

The hydrofoil mechanism 30 is provided on the main hull 11A. Thus, when the float 15A is moved vertically relative to the main hull 11A, the hydrofoil mechanism 30 moves up and down together with the main hull 11A. Therefore, even if the float 15A is lowered with respect to the main hull 11A and the sink amount of the float 15A below the water surface Wf is increased, it is possible to suppress the hydrofoil mechanism 30 from interfering with the water bottom Wb. Further, there is no need to move the hydrofoil mechanism 30 up and down with respect to the main hull 11A together with the float 15A. Therefore, even when the hydrofoil mechanism 30 is provided with a hydraulic system or an electric system for adjusting the direction and the inclination angle of the wing body 32, it is possible to suppress the structure from becoming complicated.
As described above, in the ship 1A, even when the water depth is shallow, it is possible to suppress a trouble in navigation and to simplify the structure.

In addition, since the float 15A has a drainage amount, the drainage amount of the main hull 11A can be suppressed, and the main hull 11A can be downsized.

Further, if the float 15A is lowered with respect to the main hull 11A at a predetermined sailing speed or less, the float 15A or a guide member or the like for guiding the float 15A in the up-down direction is, for example, FRP or the like. Can be formed. This makes it possible to reduce the weight of the boat 1A.

(Modification of First Embodiment)
In the first embodiment described above, the case where the boat 1A is a multihull using the main body 13 and the floats 15A on both sides in the width direction has been described. However, the ship according to the present invention is not limited to a multihull.
FIG. 5 is a front view showing the overall configuration of the marine vessel in a modification of the first embodiment of the marine vessel. FIG. 6 is a front view showing a state in which the float is lowered and the draft of the main hull is made shallow in a boat according to a modification of the first embodiment of the boat.
As shown in FIGS. 5 and 6, a hull 10B of a boat 1B according to a modification of the first embodiment includes a main hull 11B and a float 15B.

The main hull 11B is provided with a concave portion 14 in which a float 15B is accommodated at the bottom of the ship on both sides in the ship width direction.

The floats 15B are provided on both sides of the main hull 11B in the ship width direction. Each float 15B has a bottom surface 15f that is continuous with the bottom surface 11f of the main hull 11B when housed in the concave portion 14.
The float 15B is vertically moved relative to the main hull 11B by a moving mechanism 50B including a hydraulic cylinder 52 (see FIG. 6) and the like. As shown in FIG. 5, the float 15B is housed in the recess 14 with the hydraulic cylinder 52 contracted. In this state, the bottom surface 15f of the float 15B is continuous with the bottom surface 11f of the main hull 11B, and forms the bottom surface 10b of the hull 10B constituting the monohull. As shown in FIG. 6, the float 15B projects below the bottom surface 11f of the main hull 11B with the hydraulic cylinder 52 extended.

In such a ship 1B, during normal navigation, the hydraulic cylinder 52 of the moving mechanism 50B is contracted, and each float 15B is accommodated in the recess 14 of the main hull 11B.
In addition, when the water depth is shallow, the marine vessel 1B extends the hydraulic cylinder 52 of the moving mechanism 50B, moves each float 15B relative to the main hull 11B, and projects the float 15B downward. Then, the amount of settlement of the floats 15B on both sides in the boat width direction below the water surface Wf increases. Thereby, the buoyancy generated in the float 15B increases. As a result, the main hull 11B rises with respect to the water surface Wf, and the draft of the main hull 11B becomes shallower.

も Also in such a configuration, the float 15B can be lowered with respect to the main hull 11B, and the draft of the main hull 11B can be reduced. Thereby, when navigating in a shallow water area, entering a port, entering a dog, etc., it is possible to suppress a part of the ship 1B from interfering with the water bottom Wb. Further, when docking in the dog, the bottom surface 11f of the main hull 11B and the like can be raised upward to facilitate maintenance work. Further, by moving the float 15B up and down with respect to the main hull 11B, the draft of the main hull 11B can be adjusted with respect to the quay 100, and the getting on and off the boat 1B can be easily performed. As described above, in the ship 1B, even when the water depth is shallow, it is possible to suppress a trouble in navigation and to simplify the structure.

(Second embodiment)
Next, a second embodiment of the ship according to the present invention will be described. In the second embodiment described below, a ship 1C is a hydrofoil ship, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

FIG. 7 is a side view showing the overall configuration of a ship according to the second embodiment of the present invention. FIG. 8 is a front view of the ship in the second embodiment of the ship as viewed from the bow side. FIG. 9 is a front view showing a state in which the float is raised and the draft of the main hull is deepened in the boat according to the second embodiment of the boat. FIG. 10 is a front view showing a state in which the float is lowered and the draft of the main hull is made shallow in the boat according to the second embodiment of the boat.
As shown in FIGS. 7 and 8, the boat 1C in this embodiment includes a hull 10C, a propulsion mechanism 60, a hydrofoil mechanism 70, and a moving mechanism 50C (see FIG. 10).

The hull 10C includes a main hull 11C and a float 15C.
The main hull 11C has a hull main body 17 and a main body 18. The hull main body 17 has a pair of side sides 17s on both sides in the ship width direction. The main body 18 is provided at the center in the boat width direction of the hull main body 17. The main body 18 protrudes downward from the lower surface 17 b of the hull main body 17. The main body 18 is continuous in the bow direction of the main hull 11C.

The floats 15C are provided on both sides of the hull body 17 in the boat width direction. Each of the floats 15C is provided at intervals on both sides in the boat width direction with respect to the main body portion 18. Each float 15C is arranged below the lower surface 17b of the hull main body 17. The float 15C is continuous in the bow direction of the main hull 11C. Each float 15C is provided independently of the main hull 11C and the hydrofoil mechanism 70. Such a float 15C can be formed by, for example, FRP or the like.

The float 15C has a hollow structure and a drainage amount. That is, the float 15C forms a part of the displacement of the hull 10C. The float 15C is vertically movable relative to the main hull 11C by a moving mechanism 50C described later.
The hull 10C includes a main body portion 18 at the center in the ship width direction and floats 15C on both sides in the ship width direction, and constitutes a trihull (multihull).

The propulsion mechanism 60 generates a propulsion force for propelling the main hull 11C (the hull 10C). The propulsion mechanism 60 according to the second embodiment includes, for example, a water jet 61. The water jet 61 is provided on the stern 18 </ b> C of the main body 18. The water jet 61 has an injection nozzle driven by an engine (not shown). The water jet 61 causes an engine driven by burning fuel to inject water sucked from a suction port provided in a rear hydrofoil 72 described later from an injection nozzle. The propulsion mechanism 60 propells the hull 10C at high speed by injecting water backward from the injection nozzle.

The hydrofoil mechanism 70 is provided on the main hull 11C. The hydrofoil mechanism 70 includes a front hydrofoil 71 and a rear hydrofoil 72.
The front hydrofoil 71 is provided below the bow 11a of the main hull 11C. The front hydrofoil 71 includes struts (supporting portions) 73 and a wing 74. The strut 73 extends downward. The upper end of the strut 73 is fixed to the main hull 11C. The wing 74 is provided below the strut 73. The wing 74 is provided so as to be submerged below the water surface Wf, and generates a lift for floating the main hull 11 </ b> C during navigation by the propulsion generated by the propulsion mechanism 60.

The rear hydrofoil 72 is provided below the stern 11r of the main hull 11C. The rear hydrofoil 72 includes a strut (support) 75 and a wing body 76. The strut 75 has an upper end fixed to the main hull 11C and extends downward. The wing body 76 is provided below the strut 75. The wing body 76 has, for example, twice or more the length of the wing body 74 of the front hydrofoil 71 in the boat width direction. The wing body 76 is provided so as to be submerged below the water surface Wf, and generates a lift force for floating the main hull 11C during navigation by the propulsion generated by the propulsion mechanism 60.

移動 As shown in FIGS. 9 and 10, the moving mechanism 50C (see FIG. 10) connects each float 15C to the main hull 11C. The moving mechanism 50C vertically moves each float 15C relative to the main hull 11C. The moving mechanism 50C includes, for example, a hydraulic cylinder 53. The hydraulic cylinders 53 are provided, for example, at a plurality of locations spaced apart in the bow-stern direction in each float 15C. The base end of each hydraulic cylinder 53 is fixed to lower surfaces 17 b on both sides in the width direction of the hull main body 17. The lower end of the hydraulic cylinder 53 is connected to the upper surface of the float 15C. The hydraulic cylinder 53 is driven to expand and contract downward by hydraulic pressure.

As shown in FIGS. 8 and 9, the hydraulic cylinder 53 is housed in the hull body 17 or the float 15C when the hydraulic cylinder 53 is in the most contracted state. As shown in FIG. 10, when each hydraulic cylinder 53 extends downward, the float 15C relatively moves downward so as to be separated from the main hull 11C (main body 18). When each hydraulic cylinder 53 is contracted, the float 15C relatively moves upward so as to approach the main hull 11C (main body 18).

In this embodiment, the lower end of the bottom surface 15b of the float 15C is located at the same height as the lower end of the bottom surface 11b of the main hull 11C when the hydraulic cylinder 53 is in the most contracted state. When the hydraulic cylinder 53 is in the most extended state, the float 15C projects below the bottom surface 11b of the main hull 11C.
These floats 15C are arranged above both ends of the wing body 76 in the ship width direction. Therefore, the float 15 </ b> C moves up and down between the wing body 76 of the rear hydrofoil 72 and both ends of the hull main body 12 in the boat width direction.

As shown in FIG. 9, such a ship 1C contracts the hydraulic cylinders 53 (see FIG. 10) of the moving mechanism 50C when traveling at low speed, and separates each float 15C from the lower surface 17b of the hull body 17 of the main hull 11C. Place near or in contact with Thus, the boat 1C during normal navigation can stably navigate with the main body portion 18 and the floats 15C on both sides in the boat width direction landing thereon.

On the other hand, as shown in FIGS. 7 and 8, when the ship 1 </ b> C navigates at high speed by the propulsion generated by the propulsion mechanism 60, the

wings

74 and 76 of the hydrofoil mechanism 70 submerged in the water are generated. By the lift, the main hull 11C floats on the water surface Wf. In this state, the hydraulic cylinder 53 of the moving mechanism 50C causes the float 15C to approach the main hull 11C, and positions the float 15C above the water surface Wf. Thereby, the hull 10C is prevented from interfering with the water surface Wf, and high-speed and comfortable navigation can be performed while suppressing the influence of the waves.

Also, as shown in FIG. 10, when the water depth is shallow, the marine vessel 1C extends the hydraulic cylinder 53 of the moving mechanism 50C, and relatively moves each float 15C downward with respect to the main hull 11C. Then, the amount of settlement of the floats 15C on both sides in the ship width direction below the water surface Wf increases. Thereby, the buoyancy generated in the float 15C increases. As a result, the main hull 11C rises with respect to the water surface Wf, and the draft of the main hull 11C becomes shallower.
In this state, if the water jet 61 of the propulsion mechanism 60 cannot suck up water, the water jet 61 may be equipped with a retractable thruster.

Accordingly, according to the boat 1C of the second embodiment described above, the float 15C moves relatively up and down with respect to the main hull 11C by the moving mechanism 50C. Thus, when the amount of submersion of the float 15C below the water surface is changed by the moving mechanism 50C, the draft of the main hull 11C changes. When the float 15C is lowered with respect to the main hull 11C, the buoyancy generated at the float 15C increases, and the draft of the main hull 11C becomes shallower. Thereby, when navigating in a shallow water area, entering a port, entering a dog, or the like, a part of the ship 1C is prevented from interfering with the water bottom Wb. In addition, when docking in the dog, the bottom surface of the main body portion 18, the water jet 61, and the like can be raised above the water surface Wf to facilitate maintenance work. Further, as shown in FIG. 10, by moving the float 15C up and down with respect to the main hull 11C, the freeboard (height above the water surface) of the main hull 11C is adjusted with respect to the quay 100, and getting on and off the boat 1C. Can be easily performed.

The hydrofoil mechanism 70 of the second embodiment is provided on the main hull 11C. Thus, when the float 15C is moved vertically relative to the main hull 11C, the hydrofoil mechanism 70 moves up and down together with the main hull 11C.
Therefore, even if the float 15C is lowered with respect to the main hull 11C and the amount of submersion of the float 15C below the water surface is increased, interference of the hydrofoil mechanism 70 with the water bottom Wb is suppressed. Further, it is not necessary to move the hydrofoil mechanism 70 up and down with respect to the main hull 11C together with the float 15C. Therefore, even when the hydrofoil mechanism 70 is provided with a hydraulic system or an electric system for adjusting the direction and the inclination angle of the wing body 32, the structure is prevented from becoming complicated.
As described above, in the ship 1C, even when the water depth is shallow, it is possible to suppress a trouble in navigation and to simplify the structure.

Further, when the ship is navigated by the propulsion generated by the propulsion mechanism 60, the main hull 11C floats by the lift generated by the

wings

74 and 76, and the resistance of water by the main hull 11C can be suppressed.
In such a ship 1C, in a shallow water area, by lowering the float 15C with respect to the main hull 11C, it is possible to effectively prevent the main hull 11C and the hydrofoil mechanism 70 from interfering with the water bottom Wb.

移動 Also, when the main hull 11C is floating by the lift generated by the

wings

74 and 76 during navigation, the moving mechanism 50C positions the float 15C above the water surface Wf. Thereby, the resistance of water caused by the main hull 11C and the float 15C during navigation is eliminated, and it is possible to perform comfortable navigation at high speed with little shaking.

Furthermore, since the float 15C is configured to have a drainage amount, the drainage amount of the main hull 11C can be suppressed, and the main hull 11C can be downsized.

Further, if the lowering of the float 15C with respect to the main hull 11C is performed at a predetermined navigation speed or less, the float 15C and a guide member for guiding the float 15C in the vertical direction can be, for example, FRP or the like. Can be formed. Thereby, it is possible to reduce the weight of the ship 1C.

(Other modifications)
The present invention is not limited to the above-described embodiment, and includes various modifications of the above-described embodiment without departing from the spirit of the present invention. That is, the specific shape, configuration, and the like described in the embodiment are merely examples, and can be appropriately changed.
For example, in the above-described embodiment and its modified example, one float 15A to 15C is provided on each of both sides in the boat width direction, but the present invention is not limited to this. A plurality of floats may be provided on both sides in the ship width direction. Further, a plurality of floats may be provided in the bow and stern direction.
Furthermore, in the first embodiment and the second embodiment, a trihull is exemplified as a multihull, but a catamaran or a multihull having four or more hulls may be used.
The specific shapes and configurations of the hulls 10A to 10C can be changed as appropriate.
Further, the types of the ships 1A to 1C are not limited at all.

DESCRIPTION OF

SYMBOLS

1A, 1B,

1C Ship

10A, 10B, 10C Hull

10b Hull bottom

11A, 11B, 11C Main hull 11a Bow 11b Bottom 11f Bottom 11r Stern 12 Hull body 12b Bottom 12s Starboard 12t Upper structure 13 Main body 13A Stern 13C Bow 13b Ship bottom 13d Ship bottom 14

Recess

15A, 15B, 15C Float

15b Bottom surface

15f Bottom surface 17 Hull body

17b Bottom surface

17s Port side 18 Main body 18C Stern 20 Propulsion mechanism 21 Screw 22 Screw shaft 30

Hydrofoil mechanism

31, 73, 75 Strut (Support)
32, 74, 76

Wing bodies

50A, 50B,

50C Moving mechanisms

51, 52, 53 Hydraulic cylinder 60 Propulsion mechanism 61 Water jet 70 Hydraulic wing mechanism 71 Front hydrofoil 72 Rear hydrofoil 100 Quay wall Wb Water bottom Wf Water surface

Claims

The main hull,
A propulsion mechanism for generating a propulsion force for propelling the main hull,
A support portion fixed to the main hull and extending downward, and a hydrofoil mechanism having a wing body provided below the support portion,
A float provided independently of the main hull and the hydrofoil mechanism,
A moving mechanism that connects the float and the main hull, and relatively moves the float vertically with respect to the main hull;
Ship equipped with.
The marine vessel according to claim 1, wherein the wing body is provided submerged below the water surface, and generates a lift force for lifting the main hull during navigation by a propulsion force generated by the propulsion mechanism.
The ship according to claim 2, wherein the moving mechanism positions the float above a surface of the water when the wing body generates the lift for floating the main hull.
The ship according to any one of claims 1 to 3, wherein the float has a drainage amount.