JP2016190591A - Propeller front device and ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propeller front device capable of adjusting simply a direction of a fin, and to provide a ship using the same.SOLUTION: A propeller front device is fixed on a stern of a hull of a ship, and arranged on a position on the furthermore front side than a propeller. The propeller front device has a fin extending to a separating direction from the stern, a support part 62 supporting the fin and the stern in the relatively rotatable state and working as a revolving shaft of relative rotation between the fin and the stern, and a fixing part 64 for fixing the fin to the stern.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a propeller forward device and a ship using the same.

  Ships are provided with various mechanisms in front of propellers for the purpose of improving various performances. For example, some ships have a reaction fin device at the stern as a propeller forward device to improve propulsion performance. The reaction fin device includes a plurality of reaction fins that are arranged on the front side of the propeller so as to generate a swirling flow in a direction opposite to the rotation direction of the propeller, and extend radially about the rotation axis of the propeller (Patent Document 1). reference). Moreover, as an apparatus arrange | positioned ahead of a propeller, there also exists a duct which is provided with a cylindrical shape and forms the water flow toward a propeller (refer patent document 2). Also, a structure is described in which the duct device is provided not on the entire circumference around the stern to which the propeller is connected, but on a part thereof (see Patent Document 3).

JP 2011-121568 A JP 2008-143488 A JP 2014-125200 A

  Here, propeller forward devices such as reaction fin devices and duct devices have fins fixed to the stern surface, and the performance varies depending on the direction of the fins. When the fin is fixed to the stern by welding, or when the fin and the stern are integrally formed by casting, it is difficult to adjust the direction of the fin. Moreover, when the position of the fin is deviated when removing and remounting to adjust the angle, the performance changes.

  This invention solves the subject mentioned above, and aims at providing the propeller front apparatus which can adjust the direction of a fin easily, and a ship using the same.

  In order to achieve the above-mentioned object, the present invention is a propeller forward device fixed to the stern of a hull of a ship and disposed at a position in front of the propeller, the fin extending in a direction away from the stern. A support portion that supports the fin and the stern in a relatively rotatable state, and serves as a rotational axis of relative rotation between the fin and the stern; and a fixing that fixes the fin to the stern. And a portion.

  It is preferable that the support part includes a protrusion fixed to the stern and protruding toward the fin, and the fin has an insertion hole into which the protrusion is inserted.

  It is preferable that the support part includes a protrusion fixed to the fin and protruding toward the stern part, and the stern part is formed with an insertion hole into which the protrusion is inserted.

  It is preferable that the protrusion has a circular cross section, and the insertion hole has a circular cross section.

  Preferably, the protrusion has a gear shape in cross section, and the insertion hole has a gear in cross section.

  It is preferable that the support portion is a rod-like member that is inserted into a hole formed in the stern.

  It is preferable to further have a guidance display part formed on the surface of the stern and indicating the direction of the fins.

  It is preferable to further have a sealing part that is disposed between the stern and the fin and seals the gap.

  The fin has a concavo-convex portion formed on a surface facing the stern away from a portion connected to the support portion, and the stern is fitted with the concavo-convex portion of the fin directly or using a connecting member. It is preferable that the plurality of concavo-convex portions that can be combined are formed concentrically around the rotation axis at positions away from the rotation axis on the surface.

  It is preferable that a connecting member for connecting the uneven portion of the fin and the uneven portion of the stern is further provided, and the connecting member is detachable from the uneven portion of the stern.

  The fixing portion is preferably a welded portion that welds the fin and the stern.

  The present invention is a ship, comprising a hull, a propeller disposed at the stern of the hull, and the propeller forward device according to any one of the above disposed at the front of the stern propeller. And

  According to the present invention, since the direction of the fin can be adjusted by rotating the fin with the support portion as a fulcrum, the direction of the fin can be easily adjusted.

FIG. 1 is a schematic side view showing a stern of a ship provided with a ship reaction fin device according to an embodiment of a propeller forward apparatus. FIG. 2 is a perspective view of the marine reaction fin device. FIG. 3 is an exploded perspective view of one reaction fin of the marine reaction fin device. FIG. 4 is a partially enlarged sectional view of the reaction fin. FIG. 5 is a schematic diagram showing a schematic configuration of the fin body. FIG. 6 is a flowchart showing an example of a reaction fin mounting method. FIG. 7 is a flowchart illustrating an example of a reaction fin angle adjusting method. FIG. 8 is a partially enlarged cross-sectional view of another example reaction fin. FIG. 9 is an exploded perspective view showing another example reaction fin. FIG. 10 is an exploded perspective view showing another example reaction fin. FIG. 11 is an exploded perspective view showing another example reaction fin. 12 is a partially enlarged cross-sectional view of the reaction fin shown in FIG. FIG. 13 is an exploded perspective view showing another example reaction fin. 14 is a partially enlarged cross-sectional view of the reaction fin shown in FIG. FIG. 15 is an exploded perspective view showing another example reaction fin. FIG. 16 is a partial enlarged cross-sectional view of another example reaction fin. FIG. 17: is a schematic side view which shows the stern of a ship provided with the duct apparatus of one Embodiment of a propeller front apparatus. FIG. 18 is a perspective view showing a schematic configuration of the duct device. FIG. 19 is a cross-sectional view illustrating a schematic configuration of the duct device.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic side view showing a stern of a ship provided with a ship reaction fin device according to an embodiment of a propeller forward apparatus. As shown in FIG. 1, the rudder 2 is provided in the lower part in the stern 11 of the hull 1 of a ship. A propeller 3 is provided in front of the rudder 2. The propeller 3 is supported by a skeg 4 on a propeller shaft 31 that is a rotating shaft thereof. The skeg 4 constitutes a bossing 41 that covers the propeller shaft 31 and is formed integrally with the ship bottom of the hull 1. The outer shape of the bossing 41 is continuously formed with a smooth curve with respect to the outer surface of the hull 1 so as to bulge downward from the bottom of the hull at the center in the left-right width direction of the hull 1. Further, the bossing 41 is smoothly curved so that the outer shape gradually narrows toward the propeller 3 (from the front side toward the rear side), and the propeller 3 is disposed at the most narrowed rear end.

  The ship has a ship reaction fin device 5 at the stern 11 of the hull 1. Hereinafter, in addition to FIG. 1, the reaction fin apparatus 5 for ships is demonstrated using FIGS. 2-5. FIG. 2 is a perspective view of the marine reaction fin device. FIG. 3 is an exploded perspective view of one reaction fin of the marine reaction fin device. FIG. 4 is a partially enlarged sectional view of the reaction fin. FIG. 5 is a schematic diagram showing a schematic configuration of the fin body.

  The ship reaction fin device 5 is provided in the stern part 52. The stern part 52 is a part of the stern 11 of the hull 1. The stern part 52 of this embodiment is manufactured separately from other parts. The stern part 52 can be manufactured by casting. The stern part 52 is fixed to the stern 11 of the hull 1 and the propeller shaft 31 is inserted.

  The marine reaction fin device 5 includes a plurality of reaction fins 54. The reaction fin 54 is located in front of the propeller 3 and extends in the radial direction of the axis C of the propeller shaft 31. The end of the reaction fin 54 on the stern part 52 side is fixed to the stern part 52. The reaction fins 54 are provided with a twist so as to give the propeller 3 a flow in a direction opposite to the rotation direction of the propeller 3 that generates a propulsive force that advances the hull 1. A plurality of reaction fins 54 are provided. The ship reaction fin device 5 includes, for example, two extending in the radial direction of the axis C of the propeller shaft 31 and extending horizontally in the left-right direction, and the radial direction of the axis C of the propeller shaft 31 in the horizontal direction. Two extending at an angle of 45 ° to the left and right and extending in the radial direction of the axial center C of the propeller shaft 31 and extending at an angle of 45 ° to the left and right. A total of six may be provided.

  In the ship reaction fin device 5, when the propeller 3 rotates and the hull 1 moves forward, the reaction fin 54 sends a flow in a direction opposite to the rotation direction of the propeller 3 to the propeller 3. For this reason, the rotational flow generated in the same direction as the direction of rotation of the propeller 3 behind the propeller 3 is reduced. As a result, a reduction in propulsion efficiency of the propeller 3 due to the rotating flow is suppressed, and the propulsion performance of the propeller 3 can be improved. The plurality of reaction fins 54 are arranged on the outer peripheral surface of the stern portion 52 at a predetermined interval in the circumferential direction (rotating direction of the propeller 3), but the plurality of reaction fins 54 may be arranged on the entire circumference in the circumferential direction. , May be arranged in part.

  Next, the reaction fin 54 will be described. As shown in FIGS. 3 and 4, the reaction fin 54 includes a fin body 60, a support portion 62, and a fixing portion 64. As described above, the fin main body 60 is a member extending in the radial direction of the axis C of the propeller shaft 31. The fin body 60 may be formed of a metal material or a composite material such as CFRP. The fin body 60 has a wing shape or a semi-elliptical shape. That is, the fin body 60 has one end face in the longitudinal direction of the fin body 60 facing the stern portion 52. The fin body 60 has an insertion hole 70 formed on the surface facing the stern portion 52. The insertion hole 70 is a hole whose inner peripheral surface is a circle. The insertion hole 70 is a recess, and the wall surface of the fin body 60 is provided on the bottom and side surfaces of the hole. The insertion hole 70 is not connected to the internal space when the fin body 60 is hollow. The fin body 60 is provided with the insertion hole 70 at a position where the distance La is 0.2L or more and 0.8L or less, where L is the chord length and La is the distance from the end in the chord direction to the insertion hole 70. It is preferable.

  The support part (pedestal) 62 is fixed to the stern part 52. The support portion 62 includes a base portion 80 and a protruding portion 82 that protrudes with respect to the base portion 80. The base 80 is a plate-like member. The base 80 is fitted in a recess 72 formed in the stern part 52. The recess 72 is a hole larger than the base 80. As for the support part 62, the base 80 is being fixed to the recessed part 72 with welding or the adhesive agent. Thereby, the support part 62 is fixed to the stern part 52. The protruding portion 82 has a cylindrical shape, and is connected to the base portion 80 in a direction in which the axis of the column is perpendicular to the base portion 80. In the support portion 62, the base portion 80 and the protruding portion 82 are integrally formed. In the support portion 62, the protruding portion 82 is inserted into the insertion hole 70 of the fin body 60.

  The reaction fin 54 has a propeller diameter of A and a distance from the propeller 3 to the protrusion 82 in the ship length direction of B, and the distance B is preferably 0.1 A or more and 0.5 A or less. .

  The fixing part 64 fixes the fin main body 60 to the stern part 52 by welding, adhesion, or the like. The fixing part 64 fixes the fin body 60 to the stern part 52 by fixing the outer peripheral surface of the surface where the fin body 60 and the stern part 52 come into contact. For example, when the fin main body 60 is a metal, the fixing portion 64 fixes the fin main body 60 to the stern portion 52 by welding. For example, when the fin main body 60 is a composite material, the fixing portion 64 fixes the fin main body 60 to the stern portion 52 by bonding. Here, when the fixing portion 64 is bonded to fix the fin main body 60 to the stern portion 52, a waterproof putty such as an epoxy putty or an adhesive can be used as the adhesive. The fixing part 64 is preferably made of a material that can be used in water. Thereby, the fixing | fixed part 64 can be provided by the operation | work underwater.

  The reaction fin 54 has the above-described structure, and the fixing portion 64 and the fin main body 60 are connected to the insertion hole 70 provided in the fin main body 60 with the protruding portion 82 of the support portion 62 fixed to the stern portion 52 being inserted. The stern part 52 is fixed. Thereby, the circumferential direction and the ship length direction position of the propeller 3 of the fin main body 60 with respect to the stern part 52 are fixed at predetermined positions by the insertion hole 70 and the protruding part 82. In addition, the fin main body 60 is in a state of being rotatable around the protruding portion 82 and the insertion hole 70 before being fixed by the fixing portion 64. Thereby, the reaction fin 54 can adjust the direction of the fin main body 60 while preventing the displacement of the fin main body 60 with respect to the stern portion 52. Moreover, since the position of the circumferential direction and the ship length direction of the prop body of the fin main body 60 with respect to the stern part 52 can be fixed at a predetermined position by the insertion hole 70 and the protruding part 82, the reaction fins 54 can be easily replaced while maintaining the performance. can do.

  Moreover, the reaction fin 54 can make it easy to rotate the fin main body 60 with respect to the protrusion part 82 by making the cross section of the insertion hole 70 and the protrusion part 82 circular.

  FIG. 6 is a flowchart showing an example of a reaction fin mounting method. First, the installation position of the base (support part) 62 is formed in the stern part 52 (step S12). Specifically, the stern portion 52 is processed to form the recess 72. Next, the pedestal 62 is fixed at the installation position (step S14). As a fixing method, welding, adhesion, or the like can be used. Next, a pedestal (supporting part) 62 is inserted into the fin body 60 (step S16). That is, the protrusion 82 is inserted into the insertion hole 70. Next, the direction of the fin main body 60 is adjusted, and the fin main body 60 is fixed to the stern part 52 (step 18). That is, the fixing part 64 is formed, and the fin body 60 is fixed to the stern part 52.

  Thus, the reaction fin 54 fixes the fin main body 60 by rotating the fin main body 60 about the protrusion 82 and the insertion hole 70 and adjusting the orientation of the fin main body 60, and then forming the fixing portion 64. can do.

  Next, a method for adjusting the angle of the reaction fin 54 that is fixed will be described. FIG. 7 is a flowchart illustrating an example of a reaction fin angle adjusting method. First, the fixed state between the fin main body 60 and the stern part is released (step S22). That is, the fin main body 60 can be moved from the stern portion 52 by cutting, removing, or the like the fixing portion 64. Next, the orientation of the fin body 60 is adjusted (step S24). That is, the direction of the fin body 60 is adjusted by rotating the fin body 60 with the protrusion 82 and the insertion hole 70 as a fulcrum. Next, the fin main body 60 is fixed to the stern part 52 (step S26). That is, the fixing part 64 is formed, and the fin body 60 is fixed to the stern part 52.

As described above, the reaction fin 54 can rotate the fin body 60 while maintaining the relative position between the protrusion 82 and the insertion hole 70, so that the fin body 60 is attached to the stern part 52 even when the angle is adjusted. On the other hand, the direction of the fin main body 60 can be adjusted while suppressing displacement in the ship length direction and the rotation direction.

  Hereinafter, another example of the reaction fin will be described with reference to FIGS. Hereinafter, the same reference numerals are given to the same configuration parts, and the description thereof will be omitted, and the points peculiar to each example will be mainly described.

  FIG. 8 is a partially enlarged cross-sectional view of another example reaction fin. In the above embodiment, the concave portion 72 is provided at the installation position of the support portion (pedestal) 62, but the present invention is not limited to this. The reaction fin 54 a shown in FIG. 8 includes a fin body 60, a support part 62, a fixing part 64, and a sealing material 90. The support portion 62 of the present embodiment is fixed to a flat surface of the stern portion 52, that is, a position that is not recessed with respect to other portions. The sealing portion 90 is disposed around the base portion 80 of the support portion 62 and between the fin body 60 and the stern portion 52. The sealing portion 90 fills and closes the gap between the fin main body 60 and the stern portion 52. An underwater putty, rubber, or caulking agent can be used as the sealing portion 90. It is preferable to use a material that can be used in water for the sealing portion 90. Thereby, the sealing part 90 can be provided by the operation | work in water.

  Thus, the reaction fin 54a can reduce the labor of processing the stern part 52 by setting it as the structure which does not provide a recessed part. Further, by adjusting the gap with the sealing portion 90, the stern portion 52 can be prevented from changing with respect to the fin body 60.

  FIG. 9 is an exploded perspective view showing another example reaction fin. The reaction fin 54b shown in FIG. 9 includes a fin body 60, a support portion 62, a fixing portion 64, and a guide display portion 91. In addition, illustration of the fixing | fixed part 64 is abbreviate | omitted. The guide display part 91 is provided on the surface of the stern part 52 at a position along the end locus when the fin body 60 is rotated. The guidance display unit 91 has a plurality of scales 92. The reaction fin 54 b can adjust the orientation of the fin body 60 while confirming with the scale 92 by providing the guide display portion 91 having a plurality of scales 92. Thereby, the direction of the fin body 60 can be easily adjusted.

  FIG. 10 is an exploded perspective view showing another example reaction fin. The reaction fin 54c shown in FIG. 10 includes a fin body 60a, a support portion 62a, and a fixing portion 64. The fin body 60a has an insertion hole 70a. The support part 62a has the protrusion part 82a. The insertion hole 70a and the protrusion 82a have a cross-sectional gear shape, that is, a shape in which regular irregularities (teeth) are continuous in the circumferential direction.

  The reaction fin 54c can change the direction of the fin main body 60a with respect to the stern portion 52 by shifting the position of the tooth where the insertion hole 70a and the protruding portion 82a mesh. When changing the direction of the reaction fin 54c, the protrusion 82a is removed from the insertion hole 70a of the fin main body 60a and inserted again. The reaction fin 54c can adjust the orientation of the fin body 60a at an angular interval based on the number of teeth with which the insertion hole 70a and the protrusion 82a are engaged. In addition, the reaction fin 54c has a shape in which periodic irregularities are formed on the outer peripheral surfaces of the insertion hole 70a and the protrusion 82a. However, the angle based on the number of polygonal corners can be obtained by making the cross section a regular polygon. The direction of the fin body 60a can be adjusted by the interval.

  In addition, although the angle cannot be adjusted, a shape having a cutout in the circle of the insertion hole 70a and the protruding portion 82a, or a structure having a key groove and unevenness filling the key groove may be used.

  FIG. 11 is an exploded perspective view showing another example reaction fin. 12 is a partially enlarged cross-sectional view of the reaction fin shown in FIG. The reaction fin 54d shown in FIGS. 11 and 12 includes a fin body 60b, a support portion 62, a fixing portion 64, and a plurality of protrusions 104. In addition, illustration of the fixing | fixed part 64 is abbreviate | omitted. The fin body 60 b includes an insertion hole (first insertion hole) 70 and a second insertion hole 102. The second insertion hole 102 is disposed at a position away from the insertion hole 70. The plurality of protrusions 104 are fixed to the stern part 52. The protruding portion 104 protrudes in a direction parallel to the protruding portion 82 of the support portion 62. The protrusion 104 is a protrusion that can be inserted into the second insertion hole 102. The plurality of protrusions 104 are arranged at positions along a locus through which the second insertion hole 102 passes when the fin body 60b is rotated about the insertion hole 70 and the support part 62 as axes.

  FIG. 12 shows the protrusion 104 inserted into the second insertion hole 102 and the fin body 60b. The protrusion 104 and the fin body 60b are fixed by the fastening mechanism 110. The fin body 60 b has a through hole 120 that communicates with the second insertion hole 102. The through hole 120 extends in a direction intersecting the second insertion hole 102. A recess 122 and a recess 124 are provided at the end of the through hole 120. Further, the protrusion 104 is provided with a through hole 126 at a position connected to the through hole 120. The through hole 126 is preferably formed in a wider range than the through hole 120 in the circumferential direction of the protrusion 104. Thereby, it can prevent that the through-hole 120 and the through-hole 126 will be in the state which does not overlap.

  The fastening mechanism 110 has a bolt 112 and a nut 114, and the bolt 112 is inserted into the through hole 120 and the through hole 126. The head of the bolt 112 is housed in the recess 122, and the nut 114 is housed in the recess 124. The fin body 60 b can be fixed to the stern portion 52 by inserting the fastening mechanism 110 into the through holes 120 and 126.

  The reaction fin 54d can adjust the direction of the fin main body 60b by switching the protrusion 104 inserted into the second insertion hole 102. In addition, by inserting the member connected to the stern portion 52 into both the insertion hole 70 and the second insertion hole 102 of the fin body 60b, the orientation of the fin body 60b with respect to the stern portion 52 is shifted when the fixing portion 64 is formed. Can be suppressed.

  By providing the fastening mechanism 110, the reaction fin 54d can fix the fin main body 60b to the stern portion 52 without providing the fixing portion 64 that is fixed by welding or adhesion. In addition, it can fix more firmly by using the fastening mechanism 110, welding, and adhesion | attachment.

  FIG. 13 is an exploded perspective view showing another example reaction fin. 14 is a partially enlarged cross-sectional view of the reaction fin shown in FIG. The reaction fin 54e shown in FIGS. 13 and 14 includes a fin body 60b, a support portion 62, a fixing portion 64, an insertion rod 130, and a plurality of holes 132. In addition, illustration of the fixing | fixed part 64 is abbreviate | omitted. The fin body 60 b includes an insertion hole (first insertion hole) 70 and a second insertion hole 102. The insertion rod 130 is a rod that can be inserted into the second insertion hole 102 and the hole 132. The plurality of holes 132 are formed in the stern portion 52. The plurality of holes 132 are formed at positions along a locus through which the second insertion hole 102 passes when the fin body 60b is rotated about the insertion hole 70 and the support portion 62 as axes.

  FIG. 14 shows the second insertion hole 102 and the hole 132 into which the insertion rod 130 is inserted, and the fin body 60b. A nut 140 is disposed in the hole 132. The nut 140 is fixed to the hole 132 by a fixing portion 142. The hole of the nut 140 and the hole 132 are coaxially arranged. The insertion rod 130 is formed with a thread groove, and is fixed to the hole 132 by screwing with the nut 140. The insertion rod 130 has a through hole 134 formed therein. The insertion rod 130 and the fin body 60b are fixed by the fastening mechanism 110. The fin body 60 b has a through hole 120 that communicates with the second insertion hole 102. The through hole 120 extends in a direction intersecting the second insertion hole 102. A recess 122 and a recess 124 are provided at the end of the through hole 120. In addition, the insertion rod 130 is provided with a through hole 134 at a position where it is connected to the through hole 120. The through hole 134 is preferably formed in a wider range than the through hole 120 in the circumferential direction of the insertion rod 130. Thereby, it can prevent that the through-hole 120 and the through-hole 134 will be in the state which does not overlap.

  The fastening mechanism 110 has a bolt 112 and a nut 114, and the bolt 112 is inserted into the through hole 120 and the through hole 134. The head of the bolt 112 is housed in the recess 122, and the nut 114 is housed in the recess 124. By inserting the fastening mechanism 110 into the through holes 120 and 134, the fin main body 60 b can be fixed to the stern portion 52 via the insertion rod 130.

  The reaction fin 54e can adjust the direction of the fin body 60b by switching the hole 132 into which the insertion rod 130 is inserted. Moreover, it can suppress that a some projection part is formed in the surface of the stern part 52 by providing the some hole 132 and inserting the insertion stick 130 in the hole 132 to be used. Further, since the holes 132 and the fin main body 60b do not interfere with each other, the holes 132 can be provided with high density. In addition, by inserting the member connected to the stern portion 52 into both the insertion hole 70 and the second insertion hole 102 of the fin body 60b, the orientation of the fin body 60b with respect to the stern portion 52 is shifted when the fixing portion 64 is formed. Can be suppressed.

  FIG. 15 is an exploded perspective view showing another example reaction fin. The reaction fin 54f shown in FIG. 15 includes a fin body 60b, a support portion 62, a fixing portion 64, and a plurality of protrusions 104. In addition, illustration of the fixing | fixed part 64 is abbreviate | omitted. The reaction fin 54 f is formed by processing the surface on which the support portion 62 and the plurality of protrusions 104 are arranged into a flat surface 160. By providing the support portion 62 and the plurality of protrusions 104 on the flat surface 160 as described above, it is possible to suppress a gap from being generated between the fin body 60 b and the stern portion 52. In the present embodiment, the flat surface 160 is formed. However, as in the example described above, a sealing material may be disposed in the gap to fill the gap.

  The reaction fin may have a structure in which a protrusion is provided on the fin body and the protrusion is inserted into a hole formed in the stern part 52. FIG. 16 is a partial enlarged cross-sectional view of another example reaction fin. The reaction fin 54g shown in FIG. 16 includes a fin body 60c, a support portion 62b, and a fixing portion 64. Here, the stern portion 52 has an insertion hole 170 formed on the surface facing the fin body 60c. The insertion hole 170 is a hole whose inner peripheral surface is a circle.

  The support part 62b is fixed to the fin 60c. The support part 62b has the protrusion part 182 which protrudes in the surface facing the stern part 52 of the fin main body 60b. The protrusion 182 has a cylindrical shape, and is fixed to the fin body 60b in a direction in which the axis of the cylinder is perpendicular to a surface facing the stern part 52 of the fin body 60b. The protrusion 182 may be integrated with the fin body 60b. As for the support part 62b, the protrusion part 182 of the fin main body 60b is inserted in the insertion hole 170 of the stern part 52. As shown in FIG.

  As shown in FIG. 16, the support part 62 b of the reaction fin 54 g is provided with a protrusion 180 on the fin body 60 c and an insertion hole 170 on the stern part 52. As described above, the reaction fin 54 can obtain the same effect as described above even if the insertion hole and the protruding portion are provided at opposite positions. In addition, the insertion hole 170 and the protruding portion 180 can have various shapes in the same manner as the insertion hole 70 and the protruding portion 80.

  In the said embodiment, although demonstrated as a case where the propeller front apparatus was the reaction fin apparatus 5 for ships, it is not limited to this. The propeller front device may be a duct device. FIG. 17: is a schematic side view which shows the stern of a ship provided with the duct apparatus of one Embodiment of a propeller front apparatus. FIG. 18 is a perspective view showing a schematic configuration of the duct device. FIG. 19 is a cross-sectional view illustrating a schematic configuration of the duct device. In the ship shown in FIG. 17, a duct device 200 is disposed in front of the propeller 3 of the hull 1. In the duct apparatus 200, a plurality of duct units 202 are arranged in the circumferential direction. The duct unit 202 includes fins 210 and partial ducts 212. The fin 210 is being fixed to the stern part 52 similarly to the reaction fin mentioned above. Similar to the reaction fin, the fin 210 has a fin body, a support portion, and a fixed portion, and the fin body can rotate with respect to the stern portion 52 with the support portion as an axis. The partial duct 212 is fixed to the end of the fin 210 opposite to the stern portion 52. The partial duct 212 has a shape whose cross section is an arc. Further, the partial duct 212 has a smaller arc diameter as it approaches the propeller 3. The duct device 200 forms a duct-like duct by disposing the duct unit 202 in the rotation direction of the propeller 3 and connecting the partial ducts 212 in the rotation direction. The duct device 200 forms a flow path of water toward the fins 210 by forming a pipe line, and improves the propulsion efficiency of the propeller 3. Also in the case of such a duct apparatus 200, the angle can be easily adjusted by making the fin 210 fixed to the stern portion 52 the same structure as the reaction fin. Moreover, exchange can also be simplified.

DESCRIPTION OF SYMBOLS 1 Hull 11 Stern 2 Rudder 3 Propeller 31 Propeller shaft 4 Skeg 41 Boshing 5 Ship reaction fin device 54 Reaction fin 60 Fin main body 62 Support part 64 Fixed part 200 Duct device C Center axis of propeller shaft

Claims (12)

A propeller forward device fixed to the stern of a ship's hull and disposed at a position in front of the propeller;
A fin extending in a direction away from the stern;
A support portion that supports the fin and the stern in a relatively rotatable state, and serves as a rotational axis of relative rotation between the fin and the stern;
A propeller forward device, comprising: a fixing portion that fixes the fin to the stern. The support portion includes a protrusion fixed to the stern and protruding toward the fin,
The propeller front device according to claim 1, wherein the fin has an insertion hole into which the protruding portion is inserted. The support portion includes a projecting portion fixed to the fin and projecting toward the stern portion,
The propeller forward device according to claim 1, wherein the stern portion has an insertion hole into which the protruding portion is inserted. The protrusion has a circular cross section,
The propeller front device according to claim 2 or 3, wherein the insertion hole has a circular cross section. The protrusion has a gear shape in cross section,
The propeller front device according to claim 2 or 3, wherein the insertion hole has a gear in cross section.   The propeller forward device according to claim 1, wherein the support portion is a rod-like member inserted into a hole formed in the stern.   The propeller forward device according to any one of claims 1 to 6, further comprising a guide display unit that is formed on a surface of the stern and indicates a direction of the fin.   The propeller forward device according to any one of claims 1 to 7, further comprising a sealing portion that is disposed between the stern and the fin and seals a gap. The fin has a concavo-convex portion at a position away from a portion connected to the support portion of the surface facing the stern
In the stern, a plurality of concavo-convex portions that can be fitted directly or using a connecting member with the concavo-convex portion of the fin are formed concentrically around the rotation axis at a position away from the rotation axis on the surface. The propeller forward device according to any one of claims 1 to 8, wherein the propeller forward device is provided. A connecting member that connects the uneven portion of the fin and the uneven portion of the stern;
The propeller forward device according to claim 9, wherein the connecting member is attachable to and detachable from the uneven portion of the stern.   The propeller forward device according to any one of claims 1 to 10, wherein the fixed portion is a welded portion that welds the fin and the stern. The hull,
A propeller disposed at the stern of the hull;
A ship having a propeller forward device according to any one of claims 1 to 11 disposed in front of the stern propeller.

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