Fin plate stabilizer

Abstract

The present invention is a fin stabilizer for reducing shake of a sailing ship, the fin stabilizer being provided with: a fin configured so as to protrude from the hull of the ship; a rotating shaft capable of rotating the fin around the axis so as to accommodate the protruding fin in the hull; a protrusion fixed to the rotating shaft and protruding from the rotating shaft to the outside in the radial direction of the rotating shaft; and a hook including a restricting portion for restricting rotation of the protrusion and having a lower strength than the rotation shaft and the protrusion.

Description

Technical Field

[0001] The present invention relates to a fin stabilizer for reducing the rolling of a sailing vessel. This application claims priority based on Japanese Patent Application No. 2023-004210 filed with the Japan Patent Office on January 16, 2023, and uses the contents thereof herein. Background Art

[0002] Fin stabilizers control the inclination of fins protruding from the hull to generate lift and suppress the ship's rolling. The fins bear loads from the water during navigation. Fin stabilizers are constructed by engaging a hook lever with a lead-in lever, which is attached to the rotating shaft along with the fins, to restrict the movement of the fins caused by loads (see Patent Documents 1 and 2). Previous technical literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-078477 Patent Document 2: Japanese Patent Application Laid-Open No. 2000-043785 Summary of the Invention Technical issues to be solved by the invention

[0004] When the fin collides with floating debris during navigation, an excessive load may be applied to the rotating shaft or the guide rod, causing damage to the rotating shaft or the guide rod. Repairing the rotating shaft or the guide rod may require a large amount of repair costs.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a fin stabilizer capable of reducing maintenance costs. Means for solving technical problems

[0006] In order to achieve the above-mentioned purpose, the fin stabilizer involved in the present invention is a fin stabilizer for reducing the shaking of a sailing ship, which comprises: a fin, which is configured to protrude from the hull of the ship; a rotating shaft, which can rotate the fin around the axis to accommodate the protruding fin in the hull; a protrusion, which is fixed to the rotating shaft and protrudes from the rotating shaft toward the radial outside of the rotating shaft; and a hook, including a limiting portion for limiting the rotation of the protrusion and having a strength lower than that of the rotating shaft and the protrusion. Effects of the Invention

[0007] According to the fin stabilizer of the present invention, maintenance costs can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view schematically showing the structure of a fin stabilizer according to one embodiment. Figure 2 It is a diagram schematically showing a mounting structure of a fin support shaft according to one embodiment. Figure 3 It is a perspective view showing a hook according to one embodiment. Figure 4 This is a diagram schematically showing the configuration of a restriction portion according to one embodiment. Figure 5A This is a diagram for explaining the function of the restriction portion according to one embodiment. Figure 5B This is a diagram for explaining the function of the restriction portion according to one embodiment. Figure 5C This is a diagram for explaining the function of the restriction portion according to one embodiment. Figure 6 It is a perspective view showing a hook according to another embodiment. Figure 7 It is a diagram schematically showing the structure of an upper fitting member and a lower fitting member according to another embodiment. Figure 8 This is a diagram for explaining a central area of an upper plate according to another embodiment. Figure 9 This is a diagram for explaining the central area of the lower plate according to another embodiment. Figure 10 This is a diagram schematically showing the structure of a contact plate according to a modified example of another embodiment. Figure 11 This is a diagram schematically showing the structure of a contact plate according to a modified example of another embodiment. DETAILED DESCRIPTION

[0009] Hereinafter, a fin stabilizer according to an embodiment of the present invention will be described with reference to the accompanying drawings. The above embodiment shows one mode of the present invention and does not limit the present invention, and any changes can be made within the scope of the technical concept of the present invention.

[0010] (structure) Figure 1 1 is a perspective view schematically showing the structure of a fin stabilizer 1 according to one embodiment. The fin stabilizer 1 is provided on a ship 100 and is a device for suppressing the rolling of the ship 100 during navigation. Figure 1 As shown, the fin stabilizer 1 includes a fin 2, a rotating shaft 4 (rigging shaft), a protrusion 6 (introduction rod) and a hook 8 (hook rod). In one embodiment, the fin stabilizer 1 further includes a rod 10 (rigging cylinder) and a pin 12. Figure 1 In FIG, it is assumed that the vessel 100 is heading to the right on the paper.

[0011] The fin 2 is configured to protrude from the hull 102 of the ship 100 . The rotation shaft 4 is configured to be able to rotate the fin 2 around the axis O1 of the rotation shaft 4 so that the protruding fin 2 is accommodated in the hull 102 .

[0012] In the present invention, the axis O1 around the rotation axis 4 refers to the circumferential direction centered on the axis O1 of the rotation axis 4. Hereinafter, "axis O1 around the rotation axis 4" will be referred to as "axis D1." The direction around the axis D1 in which the fin 2 rotates so that it is accommodated in the hull 102 is referred to as one direction around the axis D1, and the direction opposite to the one direction around the axis D1 is referred to as the other direction around the axis D1.

[0013] exist Figure 1 In the illustrated embodiment, the rotating shaft 4 includes a rod-shaped main body 4a that rotates about the axis O1 of the rotating shaft 4; a first rotating body 4b fixed to the main body 4a so as to rotate together with the main body 4a; and a second rotating body 4c, which is provided separately from the first rotating body 4b and fixed to the main body 4a so as to rotate together with the main body 4a. The first rotating body 4b and the second rotating body 4c each cover the main body 4a from the radially outer side of the rotating shaft 4. In some embodiments, the first rotating body 4b and the second rotating body 4c are integrally formed.

[0014] In the present invention, the radial direction of the rotating shaft 4 is a direction perpendicular to the direction in which the axis O1 of the rotating shaft 4 extends, and the axis O1 of the rotating shaft 4 is used as the starting point. Hereinafter, the "radial direction of the rotating shaft 4" will be referred to as "radial direction D2." The direction closer to the axis O1 in radial direction D2 is considered the inner side of radial direction D2, while the direction farther from the axis O1 is considered the outer side of radial direction D2. In one embodiment, the direction in which the axis O1 extends is along the vertical direction D3. That is, the rotating shaft 4 extends along the vertical direction D3.

[0015] exist Figure 1 In the illustrated embodiment, the fin stabilizer 1 includes a fin support shaft 14 that supports the fin 2. The fin support shaft 14 is mounted on the second rotating body 4c and connects the fin 2 and the rotation shaft 4. The fin support shaft 14 extends from the second rotating body 4c toward the outside in the radial direction D2. That is, the fin support shaft 14 rotates around the axis D1 together with the rotation shaft 4. By rotating the fin support shaft 14 around the axis D1, the fin 2 can enter and exit the fin accommodating space 104 formed in the hull 102. In addition, the fin support shaft 14 can support the fin 2 by tilting and rotating (swinging in the up and down direction D3) around the axis O2 of the fin support shaft 14. The fin stabilizer 1 generates lift by controlling the tilting and rotation of the fin 2 relative to the water flow from the front of the hull 102, thereby suppressing the rolling of the ship 100.

[0016] A mounting structure of the fin support shaft 14 according to one embodiment will be described. Figure 2 1 is a diagram schematically showing an installation structure of the fin support shaft 14 according to one embodiment. Figure 2 As shown, a key groove 18 is formed on one end surface 16 of the fin support shaft 14 on the rotation shaft 4 side (inward in the radial direction D2), recessed outward in the radial direction D2. Furthermore, the rotation shaft 4 includes a key 20 that protrudes outward in the radial direction D2 from the second rotating body 4c and engages with the key groove 18. Thus, in one embodiment, the fin 2 is attached to the rotation shaft 4 via the key 20 and the key groove 18. In some embodiments, the key groove 18 is formed in the second rotating body 4c, and the key 20 is provided in the fin support shaft 14.

[0017] The protrusion 6 is fixed to the rotating shaft 4. The protrusion 6 protrudes outward from the rotating shaft 4 in the radial direction D2. Figure 1 In the illustrated embodiment, the protrusion 6 is integrally mounted on the first rotating body 4b. The protrusion 6 extends outward in the radial direction D2 from the first rotating body 4b. That is, the protrusion 6 rotates around the axis D1 together with the rotating shaft 4.

[0018] The hook 8 includes a limiting portion 30 for limiting the rotation of the protrusion 6. The strength of the limiting portion 30 is lower than that of the rotating shaft 4 and the protrusion 6. The limiting portion 30 is configured to break before the rotating shaft 4 and the protrusion 6 when an impact load F greater than a specified value in a direction about the axis D1 is applied to the fin 2. In one embodiment, the strength of the limiting portion 30 is lower than that of the key 20. In one embodiment, when the ship 100 is sailing at maximum speed, if the load borne by the fin 2 from the water flow is set to the design load X, the strength of the limiting portion 30 is greater than twice and less than five times the design load X. The specific structure of the hook 8 and the limiting portion 30 will be described later.

[0019] The rod 10 has an elongated shape and is configured to be reciprocally movable along the longitudinal direction. Such a rod 10 is, for example, a hydraulic rigging cylinder. In one embodiment, the rod 10 extends along the front-rear direction of the hull 102. The pin 12 fastens the rod 10 and the protrusion 6. Figure 1 In the illustrated embodiment, the rod 10 includes a clamping portion 24 at the front end of the rod 10 for clamping the protrusion 6 from both sides in the vertical direction D3. The pin 12 penetrates both the protrusion 6 and the clamping portion 24. The fin stabilizer 1 according to the present invention moves the fin 2 about the axis D1 by reciprocating the rod 10, and controls the posture of the hull 102 in accordance with the movement of the fin 2 or the navigation of the vessel 100.

[0020] In one embodiment, the pin 12 is weaker than the rotation shaft 4 and the protrusion 6, but stronger than the restricting portion 30. When an impact load F exceeding a predetermined value in one direction about the axis D1 is applied to the fin 2, the pin 12 is configured to break before the rotation shaft 4 and the protrusion 6, and after the restricting portion 30. In one embodiment, the pin 12 has an internal space, such as a safety pin.

[0021] The structures of the hook 8 and the restriction portion 30 according to one embodiment will be described. Figure 3 It is a perspective view showing the hook 8 according to one embodiment. Figure 4 This is a diagram schematically showing the configuration of the restriction portion 30 according to one embodiment.

[0022] In one embodiment, the hook 8 is configured to move the restriction portion 30 along the vertical direction D3 and to switch whether or not to engage with the protrusion 6. In the present invention, reference is made to the hook 8 ( Figure 3 ), the structure of the hook 8 is described.

[0023] exist Figure 3 In the illustrated embodiment, the hook 8 includes: a main body 22 including a limiting portion 30; and a tube portion 23, which is located on the outside of the main body 22 in the radial direction D2 and is fixed to the main body 22. The main body 22 includes a support plate 32, an upper plate 34, and a lower plate 36. The support plate 32 extends along the up-down direction D3 (the direction in which the axis O1 of the rotating shaft 4 extends). The upper plate 34 is connected to the upper end of the support plate 32 and extends from the upper end toward the other side around the axis D1. The lower plate 36 is connected to the lower end of the support plate 32 and extends from the lower end toward the other side around the axis D1. An internal space 37 defined by the support plate 32, the upper plate 34, and the lower plate 36 is formed in the main body 22.

[0024] The tube portion 23 is formed with a through-hole 25 extending in directions perpendicular to the direction around the axis D1 and the vertical direction D3 (i.e., the tangential direction D4 of the protrusion 6). A through-shaft (not shown) supported by the hull 102 is inserted into the through-hole 25. Rotation of the through-shaft by the tube portion 23 causes the main body 22 to rotate in the vertical direction D3 about the through-shaft, thereby moving the restricting portion 30 in the vertical direction D3. In some embodiments, the hook 8 is configured to enable movement of the restricting portion 30 in the radial direction D2 and to switch whether or not it engages with the protrusion 6.

[0025] The hook 8 is positioned at its limit position, corresponding to when the fin 2 is at its furthest position on the other side of the axis D1. The hook 8, positioned at its limit position, engages with the protrusion 6, preventing the protrusion 6 from rotating in one direction about the axis D1 beyond the limit position. In other words, the fin 2 is restricted from moving in one direction about the axis D1. In one embodiment, the hook 8 is configured to restrict movement of the tube 23 about the axis D1 (for example, by locking the tube 23 with a non-slip member (not shown)) and to secure the position of the main body 22 about the axis D1.

[0026] In one embodiment, if Figure 3 As shown in the example, the restricting portion 30 includes a support plate 32 fixed and arranged on the track 50 on which the protrusion 6 rotates, and a cushioning material 38 positioned between the support plate 32 and the protrusion 6 about the axis D1 (the direction of rotation of the protrusion 6). As described above, the position of the support plate 32 of the main body 22 about the axis D1 is fixed by the tube portion 23. The cushioning material 38 is positioned in the internal space 37 of the main body 22. Thus, the restricting portion 30 is positioned between the upper plate 34 and the lower plate 36 in the vertical direction D3. That is, the upper plate 34 is positioned above the restricting portion 30, and the lower plate 36 is positioned below the restricting portion 30.

[0027] The strength of the cushioning material 38 is lower than that of the support plate 32. That is, the cushioning material 38 is configured to break before the support plate 32 when an impact load F in one direction around the axis D1 exceeding a predetermined value is applied to the fin plate 2. Figure 4 As shown in the example, a groove 40 is formed on one end surface 39 of the support plate 32 on the side of the cushioning material 38 .

[0028] In one embodiment, if Figure 3 As shown in the example, the cushioning material 38 includes a cylindrical member 42 having a cylindrical shape. The cylindrical member 42 extends along the tangential direction D4 of the rail 50. Figure 4 As shown in the example, the limiting portion 30 includes: a first cylindrical member 42A (42); a second cylindrical member 42B (42) disposed closer to the support plate 32 than the first cylindrical member 42A; and an intermediate plate 44 disposed between the first cylindrical member 42A and the second cylindrical member 42B. Figure 3 In the illustrated embodiment, the two first cylindrical members 42A are arranged along the vertical direction D3, but the present invention is not limited to this embodiment. The restricting portion 30 may include any number of cylindrical members 42. In the present invention, for ease of description of the hook 8 and the restricting portion 30, the direction of the tangential direction D4 toward one direction around the axis D1 is referred to as "one direction of the tangential direction D4," and the direction opposite to the one direction of the tangential direction D4 is referred to as "the other direction of the tangential direction D4."

[0029] In one embodiment, if Figure 4As shown in the example, the restricting portion 30 further includes an abutment plate 46 that abuts the end surface 45 of the first cylindrical member 42A on the protrusion 6 side. The abutment plate 46 is stronger than the first cylindrical member 42A. The abutment plate 46 is sandwiched between the upper plate 34 and the lower plate 36. Specifically, the upper plate 34 is positioned above the abutment plate 46 of the restricting portion 30 and covers the abutment plate 46 from above. Similarly, the lower plate 36 is positioned below the abutment plate 46 of the restricting portion 30 and covers the abutment plate 46 from below.

[0030] (Effect) The effects of the fin stabilizer 1 according to the embodiment will be described. Figures 5A to 5C This is a diagram for explaining the function of the restricting portion 30 according to one embodiment. When a floating object or the like collides with the fin 2 and applies an impact load F in one direction around the axis D1 exceeding a predetermined value, a torque T is generated that rotates the rotating shaft 4 in one direction around the axis D1. Figure 5A As shown, the torque T is transmitted to the restricting portion 30 of the hook 8 in a state where the protrusion 6 is in contact with the contact plate 46 .

[0031] According to one embodiment, since the restricting portion 30 of the hook 8 is weaker than the rotating shaft 4 and the protrusion 6, the restricting portion 30 can be broken before the rotating shaft 4 and the protrusion 6 are damaged by the torque T. The hook 8 is easier to repair than the rotating shaft 4 or the protrusion 6. Therefore, repair costs can be reduced.

[0032] If the strength of the restricting portion 30 is less than twice the design load X, frequent repairs of the hook 8 may be required, potentially increasing repair costs. Furthermore, if the strength of the restricting portion 30 is greater than five times the design load X, the rotating shaft 4 or protrusion 6 may be damaged first. According to one embodiment, since the strength of the restricting portion 30 is between two and five times the design load X, the hook 8 of the restricting portion 30 can be damaged before the rotating shaft 4 and protrusion 6, and the frequency of repairs of the hook 8 can be reduced.

[0033] The key 20 is likely to be damaged by the torque T. Moreover, if the key 20 is damaged, the rotating shaft 4 may need to be replaced, which greatly increases the maintenance cost. According to one embodiment, since the strength of the restriction portion 30 of the hook 8 is lower than that of the key 20, damage to the key 20 can be prevented.

[0034] According to one embodiment, Figure 5B As shown, when the torque T is greater than the strength of the buffer material 38, as shown in FIG. Figure 5AAs shown, after the protrusion 6 contacts the contact plate 46, the cushioning material 38 breaks, thereby absorbing the energy of the torque T (impact load F). Therefore, by preferentially breaking the cushioning material 38, damage to the rotating shaft 4 and the protrusion 6 can be prevented.

[0035] According to one embodiment, the strength of the cushioning material 38 is lower than that of the support plate 32. Figure 5C As shown, when the torque T is greater than the strength of the support plate 32, as shown in FIG. Figure 5B As shown, after the buffer material 38 is destroyed, the support plate 32 is cut off from the main body 22 , thereby preventing the rotation shaft 4 and the protrusion 6 from being damaged.

[0036] According to one embodiment, since the restricting portion 30 includes the contact plate 46 , the torque T can be uniformly applied to the cushioning material 38 . This prevents the torque T from being concentrated on a portion of the cushioning material 38 , thereby improving the efficiency of absorbing the energy of the torque T.

[0037] According to one embodiment, since the cushioning material 38 includes the cylindrical member 42, it is easy to manufacture the cushioning material 38 that is crushed at the desired torque T. Furthermore, the present invention is not limited to the cushioning material 38 being a cylindrical member. The cushioning material 38 may also have a cylindrical shape other than a cylindrical shape, such as a square cylinder or a hexagonal cylinder.

[0038] In addition, in the present invention, the cushioning material 38 is not limited to a cylindrical component. In some embodiments, the cushioning material 38 is a shaped object formed by stacking powdered materials, i.e., powders, using a 3D printer (not shown). A 3D printer is, for example, a three-dimensional stacking molding device that models a three-dimensional object (cushioning material 38) based on 3D CAD (computer-aided design) data or 3DCG (three-dimensional computer graphics) data. The 3D printer is configured, for example, to partially melt the powder using a laser, then sinter and perform stacking molding, and is equipped with: a material barrel for storing powder; a molding table for forming a molded object; and a residual powder barrel for storing residual powder. According to this structure, it is possible to easily manufacture a cushioning material 38 that is destroyed by a desired load.

[0039] When the cushioning material 38 includes a single cylindrical member 42, it may buckle before being crushed by the torque T. If the cylindrical member 42 buckles, the efficiency of absorbing the energy of the torque T may decrease. According to one embodiment, since the restricting portion 30 includes the first cylindrical member 42A, the intermediate plate 44, and the second cylindrical member 42B, buckling of the cylindrical member 42 caused by the torque T can be suppressed. Therefore, a reduction in the efficiency of absorbing the energy of the torque T can be suppressed.

[0040] According to one embodiment, the grooves 40 formed on one end surface 39 of the support plate 32 facilitate reducing the strength of the support plate 32. This makes it easy to achieve a support plate 32 that is weaker than the rotating shaft 4 and protrusion 6, but stronger than the cushioning material 38. Furthermore, the strength of the support plate 32 can be easily reduced compared to the pin 12. The number, position, and depth of the grooves 40 are not particularly limited and are determined based on the strength of the support plate 32.

[0041] According to one embodiment, the pin 12 is weaker than the rotating shaft 4 and the protrusion 6, but stronger than the restrictor 30 (support plate 32 and cushioning material 38). Therefore, by sequentially destroying the cushioning material 38, support plate 32, and pin 12 in three stages, damage to the rotating shaft 4 and protrusion 6 can be prevented. The pin 12 can reduce the load by adjusting the hydraulic pressure of the rod 10 (hydraulic rigging cylinder), making it easier to maintain than the rotating shaft 4 or the protrusion 6. This reduces maintenance costs.

[0042] <Another embodiment> (structure) The structure of the hook 8 according to another embodiment will be described. Figure 6 1 is a perspective view showing a hook 8 according to another embodiment. In the hook 8 according to the other embodiment, components identical to those of the hook 8 according to the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0043] like Figure 6 As shown in the example, the restricting portion 30 includes an upper fitting member 60 and a lower fitting member 70 . Figure 7 It is a diagram schematically showing the structure of the upper fitting component 60 and the structure of the lower fitting component 70 involved in another embodiment, and shows a cross-section of the abutment plate 46 cut along the thickness direction of the abutment plate 46 (the tangent direction D4 of the protrusion 6).

[0044] The upper plate 34 includes a lower surface 64 facing the interior space 37. Figure 7 As shown in the example, the upper plate 34 is formed with an upper plate recess 65 that is recessed upward from the lower surface 64. Figure 7In the illustrated embodiment, the upper plate recess 65 is a hole extending through the upper plate 34 in the vertical direction D3. This facilitates installation of the upper fitting member 60 by allowing the upper plate recess 65 to penetrate the upper plate 34. The present invention is not limited to the upper plate recess 65 penetrating the upper plate 34; the upper plate recess 65 may also be a groove.

[0045] The lower plate 36 includes an upper surface 74 facing the interior space 37. Figure 7 As shown in the example, the lower plate 36 is formed with a lower plate recess 75 that is recessed downward from the upper surface 74. Figure 7 In the illustrated embodiment, the lower plate recess 75 is a hole extending through the lower plate 36 in the vertical direction D3. This facilitates installation of the lower fitting member 70 by allowing the lower plate recess 75 to penetrate the lower plate 36. The present invention is not limited to the lower plate recess 75 penetrating the lower plate 36; the lower plate recess 75 may be a groove.

[0046] The contact plate 46 is formed with a contact plate upper side recess 66 that is recessed downward from the upper surface 47. The contact plate is formed with a contact plate lower side recess 76 that is recessed upward from the lower surface 48. Figure 7 In the illustrated embodiment, the contact plate upper recess 66 and the contact plate lower recess 76 are grooves that do not penetrate the contact plate 46 .

[0047] The upper fitting member 60 is fitted into the upper space 67 defined by the upper plate recess 65 and the contact plate upper recess 66. The upper fitting member 60 is weaker than the rotation shaft 4 and the protrusion 6 and is, for example, a safety pin.

[0048] The lower fitting member 70 is fitted into the lower space 77 defined by the lower plate recess 75 and the contact plate lower recess 76. The lower fitting member 70 is weaker than the rotation shaft 4 and the protrusion 6 and is, for example, a safety pin.

[0049] In another embodiment, Figure 6 and Figure 7 In the illustrated embodiment, the restricting portion 30 includes: a plurality of upper interlocking components 60 spaced apart from one another along the radial direction D2; and a plurality of lower interlocking components 70 spaced apart from one another along the radial direction D2. However, the present invention is not limited to this embodiment. In some embodiments, the restricting portion 30 includes one or more upper interlocking components 60 and one or more lower interlocking components 70. In some embodiments, the restricting portion 30 includes only one of the upper interlocking components 60 and the lower interlocking components 70.

[0050] In another embodiment, Figure 6As shown, the main body 22 of the hook 8 includes a breaking mechanism 80 located closer to the tube portion 23 than the restricting portion 30 in the radial direction D2. The breaking mechanism 80 is formed at the base of the main body 22 where it connects to the tube portion 23. The breaking mechanism 80 has a lower strength than the rotation shaft 4 and the protrusion 6, but a higher strength than the restricting portion 30. When an impact load F exceeding a predetermined value in a direction about the axis D1 is applied to the fin 2, the breaking mechanism 80 breaks prior to the rotation shaft 4 and the protrusion 6, and breaks after the restricting portion 30.

[0051] A specific structural example of the breaking mechanism portion 80 will be described. Figure 6 In the illustrated embodiment, the breaking mechanism 80 includes an upper plate groove 82 formed in the upper surface 68 of the upper plate 34 and a lower plate groove 84 formed in the lower surface 78 of the lower plate 36. The upper plate groove 82 extends linearly from one end to the other end of the upper plate 34 in the tangential direction D4. The lower plate groove 84 extends linearly from one end to the other end of the lower plate 36 in the tangential direction D4.

[0052] In another embodiment, Figure 6 As shown in the example, the breaking mechanism 80 includes an upper plate through-hole 86 that penetrates the central region R1 of the upper plate 34 along the vertical direction D3. Figure 6 In the illustrated embodiment, the upper plate through-hole 86 extends from the bottom surface 83 of the upper plate groove portion 82 to the lower surface 64 of the upper plate 34 .

[0053] Figure 8 1 is a diagram for explaining the central region R1 of the upper plate 34 according to another embodiment, and the upper plate 34 is viewed from above. Figure 8 As shown, when one end on one side of the tangent direction D4 of the upper plate 34 is defined as a position of 0% of the length in the tangent direction D4 of the upper plate 34 (the size of the width of the upper plate 34), and increases as it goes toward the other end on the other side of the tangent direction D4 of the upper plate 34, and the other end of the upper plate 34 is defined as a position of 100% of the length in the tangent direction D4 of the upper plate 34, the central area R1 of the upper plate 34 is included in a range of more than 20% and less than 90% of the length in the tangent direction D4 of the upper plate 34.

[0054] In another embodiment, the rupture mechanism 80 includes a lower plate through-hole 88 extending along the vertical direction D3 through the central region R2 of the lower plate 36 . The lower plate through-hole 88 extends from the top surface 85 of the lower plate groove 84 to the upper surface 74 of the lower plate 36 .

[0055] Figure 93 is a diagram for explaining the central region R2 of the lower plate 36 according to another embodiment, and the lower plate 36 is viewed from below. Figure 9 As shown, when one end on one side of the tangent direction D4 of the lower plate 36 is defined as a position of 0% of the length in the tangent direction D4 of the lower plate 36 (the size of the width of the lower plate 36), and increases as it goes toward the other end on the other side of the tangent direction D4 of the lower plate 36, and the other end of the lower plate 36 is defined as a position of 100% of the length in the tangent direction D4 of the lower plate 36, the central area R2 of the lower plate 36 is included in a range of more than 20% and less than 90% of the length in the tangent direction D4 of the lower plate 36.

[0056] In another embodiment, the rupture mechanism 80 is formed by providing an upper plate groove 82, a lower plate groove 84, an upper plate through-hole 86, and a lower plate through-hole 88 (of varying shapes) in the base of the main body 22. However, the present invention is not limited to this embodiment. The rupture mechanism 80 may also be formed by forming the base of the main body 22 from a material having lower strength than the rotation shaft 4 and the protrusion 6.

[0057] (Effect) The effects of the hook 8 according to another embodiment will be described. Figure 6 As illustrated in FIG, the restricting portion 30 includes an upper interlocking member 60 and a lower interlocking member 70. Furthermore, the strength of each of the upper interlocking member 60 and the lower interlocking member 70 is lower than that of the rotating shaft 4 and the protrusion 6. Therefore, by having the upper interlocking member 60 and the lower interlocking member 70 absorb the torque T, at least one of the upper interlocking member 60 and the lower interlocking member 70 is preferentially destroyed, thereby further preventing damage to the rotating shaft 4 and the protrusion 6. Furthermore, at least one of the upper interlocking member 60 and the lower interlocking member 70 is destroyed before the buffer material 38 is destroyed. In other words, the restricting portion 30 is configured to be destructible in three stages: at least one of the upper interlocking member 60 and the lower interlocking member 70, the buffer material 38, and the support plate 32.

[0058] According to another embodiment, Figure 6 As illustrated in the figure, the hook 8 includes a break mechanism 80 formed at the base of the main body 22. Furthermore, the break mechanism 80 is weaker than the rotating shaft 4 and the protrusion 6, but stronger than the restricting portion 30. Therefore, when a torque T that cannot be absorbed by the restricting portion 30 is generated, the break mechanism 80 is preferentially broken, allowing the protrusion 6 to rotate freely. This eliminates interference between the protrusion 6 and the hook 8, thus minimizing damage to the rotating shaft 4 and other surrounding components caused by interference between the protrusion 6 and the hook 8.

[0059] According to another embodiment, the upper plate groove 82 and the lower plate groove 84 can be formed simply by cutting the upper surface 68 of the upper plate 34 and the lower surface 78 of the lower plate 36 , so the breaking mechanism 80 can be easily formed.

[0060] When the hook 8 restricts the rotation of the protrusion 6, bending stress is generated in the upper plate 34 and the lower plate 36. Furthermore, the central region R1 of the upper plate 34 and the central region R2 of the lower plate 36 are areas where the bending stress is relatively low. According to another embodiment, the breaking mechanism 80 includes the upper plate through-hole 86 and the lower plate through-hole 88, thereby forming a breaking mechanism 80 with a certain resistance to bending.

[0061] Furthermore, in another embodiment, in order to further prevent the rotation shaft 4 and the protrusion 6 from being damaged, the restricting portion 30 includes an upper fitting member 60 and a lower fitting member 70 , but the present invention is not limited to this embodiment. Figure 10 and Figure 11 Each of them is a diagram schematically showing the structure of a contact plate according to a modified example of another embodiment.

[0062] exist Figure 10 In the illustrated embodiment, the abutment plate 46 includes an upper protrusion 90 that protrudes from the upper surface 47 and is inserted into the upper plate recess 65 formed on the lower surface 64 of the upper plate 34; and a lower protrusion 92 that protrudes from the lower surface 48 and is inserted into the lower plate recess 75 formed on the upper surface 74 of the lower plate 36. The upper protrusion 90 and the lower protrusion 92 are each integrally formed with the abutment plate 46. In some embodiments, the abutment plate 46 includes only one of the upper protrusion 90 and the lower protrusion 92. Furthermore, the strength of each of the upper protrusion 90 and the lower protrusion 92 is lower than that of the rotation shaft 4 and the protrusion 6.

[0063] exist Figure 11 In the illustrated embodiment, the abutment plate 46 includes an abutment plate upper recess 66 formed by a downward depression from the upper surface 47, and an abutment plate lower recess 76 formed by an upward depression from the lower surface 48. The upper plate 34 is provided with an upper plate protrusion 93 protruding from the lower surface 64. This upper plate protrusion 93 is inserted into the abutment plate upper recess 66. The lower plate 36 is provided with a lower plate protrusion 95 protruding from the upper surface 74. This lower plate protrusion 95 is inserted into the abutment plate lower recess 76. The strength of each of the upper plate protrusion 93 and the lower plate protrusion 95 is lower than that of the rotation shaft 4 and the protrusion 6.

[0064] The contents described in each of the above embodiments can be understood, for example, as follows.

[0065] [1] A fin stabilizer 1 according to the present invention is a fin stabilizer for reducing the rolling of a sailing vessel 100 and includes: The fin 2 is configured to protrude from the hull 102 of the vessel; a rotating shaft 4 capable of rotating the fin about an axis D1 to accommodate the protruding fin in the hull; a protrusion 6 fixed to the rotating shaft and protruding from the rotating shaft toward the outside in a radial direction D2 of the rotating shaft; and The hook 8 includes a restriction portion 30 for restricting the rotation of the protrusion and having a strength lower than that of the rotation shaft and the protrusion.

[0066] According to the structure described in [1] above, when an impact load around the axis of the fin is applied due to a collision between floating objects and the fin, the restricting portion of the hook can be broken before the rotation axis and the protrusion are damaged. The hook is easier to repair than the rotation axis and the protrusion. Therefore, the maintenance cost can be reduced.

[0067] [2] In some embodiments, in the structure described in [1] above, The limiting portion includes: A support plate 32 is fixed and arranged on the track 50 on which the protrusion rotates; and The cushioning material 38 is located between the support plate and the protrusion in the rotational direction of the protrusion, and the strength of the cushioning material is lower than that of the support plate.

[0068] According to the structure described in [2] above, the torque generated when an impact load about the axis is applied to the fin plate is absorbed by the cushioning material, and the cushioning material is preferentially destroyed, thereby preventing damage to the rotating shaft and the protrusion. Furthermore, by sequentially destroying the cushioning material and the support plate in two stages, damage to the rotating shaft and the protrusion can be further prevented.

[0069] [3] In some embodiments, in the structure described in [2] above, The cushioning material includes at least one cylindrical member 42 having a cylindrical shape. The at least one tubular member extends along a tangential direction of the track on which the protrusion rotates.

[0070] According to the structure described in [3] above, a cushioning material that is destroyed by a desired load can be easily manufactured.

[0071] [4] In some embodiments, in the structure described in [2] or [3] above, The restricting portion further includes a contact plate 46 that contacts the end surface 45 of the at least one tubular member on the protrusion side and has a higher strength than that of the at least one tubular member.

[0072] According to the structure described in [4] above, the load can be uniformly applied to the cushioning material, thereby preventing the load from being concentrated on a part of the cushioning material.

[0073] [5] In some embodiments, in the structure described in [3] or [4] above, The at least one tubular member includes a first tubular member 42A and a second tubular member 42B disposed closer to the support plate than the first tubular member. The restricting portion further includes an intermediate plate 44 that is disposed between the first tubular member and the second tubular member and has a strength higher than both the first tubular member and the second tubular member.

[0074] When the cushioning material includes a single tubular member, buckling may occur before the material breaks. According to the structure described in [5] above, the cushioning material includes the first tubular member, the intermediate plate, and the second tubular member, thereby suppressing buckling of the tubular member.

[0075] [6] In some embodiments, in the structure described in any one of [2] to [5] above, A groove 40 is formed on one end surface of the support plate on the cushioning material side.

[0076] According to the structure described in [6] above, the strength of the support plate can be easily reduced.

[0077] [7] In some embodiments, in the structure of any one of [1] to [6] above, it further comprises: The rod 10 is retractable; and Pin 12, fastening the rod and the protrusion, The pin has a strength lower than that of the rotation shaft and the protrusion, but has a strength higher than that of the restricting portion.

[0078] According to the structure described in [7] above, by breaking the restriction portion of the hook and the pin in two stages, damage to the rotation shaft and the protrusion can be further prevented. The pin is easier to repair than the rotation shaft or the protrusion. Therefore, the maintenance cost can be reduced.

[0079] [8] In some embodiments, in the structure described in any one of [1] to [7] above, The fin is mounted on the rotating shaft via a key 20 and a keyway 18. The strength of the restricting portion is lower than the strength of the key.

[0080] According to the structure described in [8] above, it is possible to prevent the key from being damaged.

[0081] [9] In some embodiments, in the structure described in any one of [1] to [8] above, If the load borne by the fin from the water flow during the navigation of the ship is set as the design load, The strength of the restricting portion is not less than 2 times and not more than 5 times the design load.

[0082] If the strength of the restriction portion is less than 2 times the design load, the hook will need to be frequently repaired, and the repair cost may increase. In addition, if the strength of the restriction portion is greater than 5 times the design load, the rotation shaft or protrusion may be damaged first. According to the structure described in [9] above, it is possible to realize a hook that is damaged before the rotation shaft and protrusion when an impact load around the axis is applied to the fin plate, and the frequency of repair of the hook can be suppressed.

[0083]

[10] In some embodiments, in the structure described in [4] above, The hook includes an upper plate 34 located above the contact plate and a lower plate 36 located below the contact plate. The limiting portion further includes at least one of the following components: The upper fitting member 60 is fitted into a space 67 defined by an upper plate recess 65 formed on the lower surface 64 of the upper plate and an abutment plate upper recess 66 formed on the upper surface 47 of the abutment plate; and The lower fitting member 70 is fitted into a space 77 defined by a lower plate recess 75 formed on the upper surface 74 of the lower plate and a contact plate lower recess 76 formed on the lower surface 48 of the contact plate.

[0084] According to the structure described in

[10] above, at least one of the upper fitting part and the lower fitting part absorbs the torque generated when an impact load around the axis is applied to the fin plate, and at least one of the upper fitting part and the lower fitting part is preferentially destroyed, thereby further preventing the rotating shaft and the protrusion from being damaged respectively.

[0085]

[11] In some embodiments, in the structure described in [4] above, The hook includes an upper plate 34 located above the contact plate and a lower plate 36 located below the contact plate. The abutment plate further comprises at least one of the following components: An upper convex portion 90 protrudes from the upper surface 47 and is inserted into the upper plate concave portion 65 formed on the lower surface 64 of the upper plate; and The lower convex portion 92 protrudes from the lower surface 48 and is inserted into the lower plate concave portion 75 formed in the upper surface 74 of the lower plate.

[0086] According to the structure described in

[11] above, at least one of the upper convex portion and the lower convex portion absorbs the torque generated when an impact load around the axis is applied to the fin plate, and at least one of the upper convex portion and the lower convex portion is preferentially destroyed, thereby further preventing the rotating shaft and the protrusion from being damaged respectively.

[0087]

[12] In some embodiments, in the structure described in [4] above, The hook includes an upper plate 34 located above the contact plate and a lower plate 36 located below the contact plate. The abutment plate further comprises at least one of the following components: an upper plate recess 66 formed on the upper surface 47 and receiving an upper plate protrusion 93 protruding from the lower surface 64 of the upper plate; and The lower concave portion 76 of the contact plate is formed on the lower surface 48 and is inserted into the lower plate convex portion 95 protruding from the upper surface 74 of the lower plate. The upper plate convex portion and the lower plate convex portion each have lower strength than the rotation shaft and the protrusion.

[0088] According to the structure described in

[12] above, at least one of the upper plate protrusion and the lower plate protrusion absorbs the torque generated when an impact load around the axis is applied to the fin plate, and at least one of the upper plate protrusion and the lower plate protrusion is preferentially destroyed, thereby further preventing the rotating shaft and the protrusion from being damaged respectively.

[0089]

[13] In some embodiments, in the structure described in any one of [1] to

[12] above, The hook comprises: a main body 22 including the restriction portion; and a tube portion 23 located further outward in the radial direction than the main body and fixed to the main body. The main body includes a breaking mechanism portion 80 on the tube portion side in the radial direction relative to the restriction portion. The breaking mechanism portion 80 has a strength lower than that of the rotation shaft and the protrusion and a strength higher than that of the restriction portion.

[0090] According to the structure described in

[13] above, when an impact load around the axis is applied to the fin plate, the fracture mechanism is preferentially broken, so that the protrusion becomes able to rotate freely. In other words, the protrusion no longer interferes with the hook, thereby suppressing damage to the rotating shaft and other peripheral components caused by the interference between the protrusion and the hook.

[0091]

[14] In some embodiments, in the structure described in

[13] above, The main body includes an upper plate 34 located above the limiting portion and a lower plate 36 located below the limiting portion. The breaking mechanism includes at least one of the following components: an upper plate groove 82 formed on the upper surface 68 of the upper plate; and The lower plate groove 84 is formed on the lower surface 78 of the lower plate.

[0092] According to the structure described in

[14] above, the breaking mechanism portion can be easily formed.

[0093]

[15] In some embodiments, in the structure described in

[13] or

[14] above, The main body includes an upper plate 34 located above the limiting portion and a lower plate 36 located below the limiting portion. The breaking mechanism portion includes at least one of the following components: An upper plate through hole 86 passes through the central region R1 of the upper plate along the up-down direction D3; and The lower plate through-hole 88 penetrates the central region R2 of the lower plate along the up-down direction D3.

[0094] When the hook restricting protrusion rotates, bending stress is generated in the upper plate and the lower plate. The central area of the upper plate and the central area of the lower plate are respectively the areas with relatively low bending stress. According to the structure described in

[15] above, since the breaking mechanism includes at least one of the upper plate through-hole and the lower plate through-hole, it is possible to form a breaking mechanism with a certain resistance to bending. Explanation of symbols

[0095] 1-Fin stabilizer, 2-Fin, 4-Rotation shaft, 4a-Main body, 4b-First rotating body, 4c-Second rotating body, 6-Protrusion, 8-Hook, 10-Rod, 14-Fin support shaft, 16-One end surface of the fin support shaft, 18-Keyway, 20-Key, 22-Main body, 23-Tube, 24-Clamping part, 25-Through hole, 30-Restriction part, 32-Support plate, 34-Upper plate, 36-Lower plate, 3 7-Internal space, 38-Buffer material, 39-One end surface of the support plate, 40-Groove, 42-Cylindrical component, 42A-First cylindrical component, 42B-Second cylindrical component, 44-Intermediate plate, 45-End surface of the first cylindrical component, 46-Abutment plate, 47-Upper surface of the abutment plate, 48-Lower surface of the abutment plate, 50-Rail, 60-Upper fitting component, 64-Lower surface of the upper plate, 65-Upper plate recess, 66- 6- upper concave portion of the contact plate, 67- upper space, 68- upper surface of the upper plate, 70- lower fitting component, 74- upper surface of the lower plate, 75- lower plate concave portion, 76- lower concave portion of the contact plate, 77- lower space, 78- lower surface of the lower plate, 80- breaking mechanism portion, 82- upper plate groove portion, 83- bottom surface of the upper plate groove portion, 84- lower plate groove portion, 85- top surface of the lower plate groove portion, 86- upper plate through hole, 88- lower plate Through hole, 90-upper side convex part, 92-lower side convex part, 93-upper plate convex part, 95-lower plate convex part, 100-ship, 102-hull, 104-fin plate accommodating space, D1-around the axis, D2-radial direction, D3-upper and lower directions, D4-tangential direction, F-impact load, O1-axis of the rotating shaft, O2-axis of the fin plate supporting shaft, R1-central area of the upper plate, R2-central area of the lower plate, T-torque.

Claims

1. A fin stabilizer for reducing the rolling of a sailing ship, the fin stabilizer comprising: a fin configured to protrude from the hull of the vessel; a rotating shaft capable of rotating the fin plate around an axis to accommodate the protruding fin plate in the hull; a protrusion fixed to the rotating shaft and protruding from the rotating shaft toward the outside in the radial direction of the rotating shaft; and The hook includes a restriction portion for restricting the rotation of the protrusion and having a strength lower than that of the rotation shaft and the protrusion.

2. The fin stabilizer according to claim 1, wherein: The limiting portion includes: a support plate, fixed and arranged on the track on which the protrusion rotates; and a buffer material located between the support plate and the protrusion in the rotation direction of the protrusion, The strength of the buffer material is lower than the strength of the support plate.

3. The fin stabilizer according to claim 2, wherein: The cushioning material includes at least one cylindrical member having a cylindrical shape, The at least one tubular member extends along a tangential direction of the track on which the protrusion rotates.

4. The fin stabilizer according to claim 2 or 3, wherein: The restricting portion further includes a contact plate that contacts an end surface of the at least one tubular member on the protrusion side and has a strength higher than that of the at least one tubular member.

5. The fin stabilizer according to claim 3, wherein: The at least one tubular member includes a first tubular member and a second tubular member disposed closer to the support plate than the first tubular member. The restricting portion further includes an intermediate plate that is disposed between the first tubular member and the second tubular member and has a strength higher than both the first tubular member and the second tubular member.

6. The fin stabilizer according to claim 2 or 3, wherein: A groove is formed on one end surface of the support plate on the side of the cushioning material.

7. The fin stabilizer according to any one of claims 1 to 3, further comprising: a rod that is retractable; and a pin, fastening the rod and the protrusion, The pin has a strength lower than that of the rotation shaft and the protrusion, but has a strength higher than that of the restricting portion.

8. The fin stabilizer according to any one of claims 1 to 3, wherein: The fin is mounted on the rotating shaft via a key and a keyway. The strength of the restricting portion is lower than the strength of the key.

9. The fin stabilizer according to any one of claims 1 to 3, wherein: If the load borne by the fin from the water flow during the navigation of the ship is set as the design load, The strength of the restriction portion is not less than 2 times and not more than 5 times the design load.

10. The fin stabilizer according to claim 4, wherein: The hook includes: an upper plate located above the abutting plate; and a lower plate located below the abutting plate. The limiting portion further includes at least one of the following components: an upper fitting member fitted into a space defined by an upper plate recess formed on the lower surface of the upper plate and an abutment plate upper recess formed on the upper surface of the abutment plate; and The lower fitting member is fitted into a space defined by the lower plate recess formed on the upper surface of the lower plate and the contact plate lower side recess formed on the lower surface of the contact plate.

11. The fin stabilizer according to claim 4, wherein: The hook includes: an upper plate located above the abutting plate; and a lower plate located below the abutting plate. The abutment plate further comprises at least one of the following components: an upper convex portion protruding from the upper surface and inserted into an upper plate concave portion formed on the lower surface of the upper plate; and The lower convex portion protrudes from the lower surface and is inserted into the lower plate concave portion formed on the upper surface of the lower plate.

12. The fin stabilizer according to claim 4, wherein: The hook includes: an upper plate located above the abutting plate; and a lower plate located below the abutting plate. The abutment plate further comprises at least one of the following components: an upper concave portion of the abutting plate, formed on the upper surface and receiving an upper plate convex portion protruding from the lower surface of the upper plate; and The lower concave portion of the abutting plate is formed on the lower surface and is inserted into the lower plate convex portion protruding from the upper surface of the lower plate. The strength of each of the upper plate convex portion and the lower plate convex portion is lower than the strength of the rotation shaft and the protrusion.

13. The fin stabilizer according to any one of claims 1 to 3, wherein: The hook comprises: a main body including the restriction portion; and a tube portion located radially outward from the main body and fixed to the main body. The main body includes a breaking mechanism portion on the tube portion side in the radial direction relative to the restriction portion. The breaking mechanism portion has a strength lower than that of the rotation shaft and the protrusion and a strength higher than that of the restriction portion.

14. The fin stabilizer according to claim 13, wherein: The main body includes: an upper plate located above the limiting portion; and a lower plate located below the limiting portion. The breaking mechanism portion includes at least one of the following components: an upper plate groove portion formed on an upper surface of the upper plate; and The lower plate groove is formed on the lower surface of the lower plate.

15. The fin stabilizer according to claim 13, wherein: The main body includes: an upper plate located above the limiting portion; and a lower plate located below the limiting portion. The breaking mechanism portion includes at least one of the following components: an upper plate through hole extending vertically through a central region of the upper plate; and The lower plate through hole passes through the central area of the lower plate along the up-down direction.

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