JP2007190957A - Thrust reinforcing shaft bracket of vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reinforce the thrust of a propeller by arranging shaft brackets in a direction to give a flow opposite to the propeller rotating direction to a propeller shaft or making them in cross-section shapes and mounting auxiliary fins in a direction to give the flow opposite to the propeller rotating direction between the shaft brackets. <P>SOLUTION: A vessel is provided with a pair of the right and left shaft brackets 1 on which the propeller shaft 2 exposed from a hull 3 is supported by a bearing 5 hung from the hull 3 in front of the propeller 4, and each of the shaft brackets 1 is arranged in a direction to give the flow opposite to the propeller rotating direction on the upper half side of the rotating propeller 4 by inclining the rear edge side 1a of each of the shaft brackets 1 in the direction opposite to the propeller rotating direction of the upper half side of the rotating propeller 4 as seen at a flat level with respect to a propeller shaft 4a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ship including a shaft bracket in which a propeller shaft is exposed from a hull and the propeller shaft is supported by a bearing suspended from the hull by a shaft bracket in front of the propeller, and more particularly, the shaft with respect to the propeller shaft. Placing the bracket in a direction that gives a flow opposite to the propeller rotation direction or a cross-sectional shape, and attaching auxiliary fins between the shaft brackets in a direction giving a flow opposite to the propeller rotation direction increases the thrust. The present invention relates to a thrust augmenting shaft bracket for a ship.

  In some ships, a propeller shaft is exposed from the hull and is known as a ship type with a shaft bracket that is supported in front of the propeller by a bearing suspended from the hull by the shaft bracket. Yes. For example, this type is used in a biaxial ship.

By the way, in the ship provided with the conventional shaft bracket, the shaft bracket is attached in parallel with the propeller shaft. On the other hand, as shown in FIG. 20, it is known that the thrust of the propeller is enhanced when a flow opposite to the propeller rotation direction is applied in the propeller rotation plane. This is because the angle of attack increases in FIG. 20 from α ₀ to α ₁ . That is, the speed increases when navigating at the same horsepower, and the fuel efficiency is saved when navigating at the same speed.

  The present invention has been devised in view of the above-described problems, and has been devised to solve the problems. The object of the present invention is to give the shaft bracket a flow opposite to the propeller rotation direction with respect to the propeller shaft. Providing a thrust-enhanced shaft bracket for ships that can increase propeller thrust by placing auxiliary fins in the orientation or cross-sectional shape, and by attaching auxiliary fins between the shaft brackets in a direction that gives a flow opposite to the propeller rotation direction. There is to do.

  In order to achieve the above object, the invention according to claim 1 is a shaft bracket in which the propeller shaft is exposed from the hull, and the propeller shaft is supported by a bearing suspended from the hull by a pair of left and right shaft brackets in front of the propeller. The upper half side of the propeller that rotates each shaft bracket by tilting in plan view opposite to the propeller rotation direction of the upper half side of the propeller that rotates the rear edge side of each shaft bracket with respect to the propeller shaft It is composed of means arranged in a direction giving a flow opposite to the propeller rotation direction.

  According to a second aspect of the present invention, there is provided a marine vessel provided with a shaft bracket in which a propeller shaft is exposed from a hull and the propeller shaft is supported by a bearing suspended from the hull by a pair of left and right shaft brackets in front of the propeller. The cross-sectional shape of each shaft bracket is asymmetrical with respect to the axis, and the virtual center line of the cross-section connecting the midpoints of the left and right asymmetrical right and left edges is bent in an arc shape in the propeller rotation direction on the upper half side of the rotating propeller And a means for making the cross-sectional shape of each shaft bracket a shape that gives a flow opposite to the propeller rotating direction on the upper half side of the rotating propeller.

  According to a third aspect of the present invention, there is provided a marine vessel provided with a shaft bracket in which the propeller shaft is exposed from the hull and the propeller shaft is supported by a bearing suspended from the hull by a pair of left and right shaft brackets in front of the propeller. Tilt in the plan view in the direction opposite to the propeller rotation direction of the upper half side of the propeller that rotates the rear edge side of each shaft bracket with respect to the shaft, and reverse the propeller rotation direction of the upper half side of the propeller that rotates each shaft bracket. Arrange the direction to give flow, make the cross-sectional shape of each shaft bracket left-right asymmetric with respect to the propeller axis, and set the virtual center line of the cross-section connecting the midpoints of the left-right asymmetric left and right sides to the upper half of the rotating propeller Make a shape that bends in an arc shape in the direction of rotation of the propeller on the side, Those composed of means for the shape giving a flow of the propeller rotational direction opposite to the half side on the propeller of rolling.

  Here, as a preferred aspect of the inventions of claims 1 to 3, auxiliary fins having an aerofoil-shaped cross-sectional shape are respectively disposed on both outer sides of the pair of left and right shaft brackets and on the outer periphery of the bearing in the middle thereof. The outer end of the propeller that rotates the distance from the center of rotation of the propeller to the outer end of the auxiliary fin, with the arrangement angle of each auxiliary fin on the outer side from the left and right shaft brackets being the same as the angle between the left and right shaft brackets The top of the propeller that rotates each auxiliary fin is tilted in plan view in the direction opposite to the propeller rotation direction of the upper half of the propeller that rotates the trailing edge side of each auxiliary fin with respect to the propeller axis. You may arrange | position in the direction which gives the flow contrary to the propeller rotation direction of a half side.

    Further, as another preferred embodiment of the present invention according to claims 1 to 3, a pair of left and right shaft brackets is provided by fixing an arcuate mounting plate to which an auxiliary fin having an aerofoil-shaped cross section is attached to the outer periphery of the bearing. Auxiliary fins are respectively arranged on both outer sides of the bearings and on the outer circumference of the bearings via arcuate mounting plates fixed to the outer circumferences of the bearings. And the length from the rotation center of the propeller to the outer end of the auxiliary fin is the same as or smaller than the outer end of the rotating propeller, and after each auxiliary fin with respect to the propeller axis The propeller rotation on the upper half side of the propeller that rotates each auxiliary fin is inclined in plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller that rotates on the edge side. It may be arranged in a direction giving the flow direction opposite.

  According to a sixth aspect of the present invention, there is provided a marine vessel including a shaft bracket in which the propeller shaft is exposed from the hull and the propeller shaft is supported by a bearing suspended from the hull by a pair of left and right shaft brackets in front of the propeller. Auxiliary fins having an aerofoil-shaped cross-sectional shape are respectively arranged on both outer sides of the pair of shaft brackets and on the outer periphery of the bearing in the middle thereof, and the arrangement angles of the outer auxiliary fins from the left and right shaft brackets are respectively set to the left and right shafts The angle from the center of the propeller to the outer end of the auxiliary fin should be the same as or smaller than the outer end of the rotating propeller. Tilt in plan view in the direction opposite to the propeller rotation direction on the upper half of the rotating propeller, Those composed of means disposed in the direction which gives the flow of the propeller rotational direction opposite to the half side on the propeller to rotate the auxiliary fins.

  According to a seventh aspect of the present invention, there is provided a marine vessel including a shaft bracket in which a propeller shaft is exposed from a hull and the propeller shaft is supported by a bearing suspended from the hull by a pair of left and right shaft brackets in front of the propeller. An arcuate mounting plate attached with an auxiliary fin having a foil-shaped cross-section is fixed to the outer periphery of the bearing, and the arcuate mounting is fixed to the outer periphery of the pair of left and right shaft brackets and to the outer periphery of the bearing. Auxiliary fins are arranged through the plate, and the angle of arrangement of the auxiliary fins on the outside from the left and right shaft brackets is the same as the angle between the left and right shaft brackets, from the center of rotation of the propeller to the outer end of the auxiliary fins The length of the propeller is the same as or smaller than the outer end of the rotating propeller. In the plan view, incline in the direction opposite to the propeller rotation direction of the upper half side of the propeller that rotates the trailing edge of each auxiliary fin in a direction opposite to that of the propeller rotation direction of the upper half side of the propeller that rotates each auxiliary fin. It consists of arranged means.

  As is clear from the above description, according to the thrust augmenting shaft bracket of the ship according to the invention of claim 1, the pair of left and right shaft brackets for suspending the bearing supporting the propeller shaft from the hull in front of the propeller is provided with respect to the propeller shaft. The propeller's thrust can be increased by tilting it in a plan view in the direction that gives the flow opposite to the propeller rotation direction on the upper half side of the propeller that rotates, and the speed is increased when sailing with the same horsepower. The fuel consumption is increased when sailing at the same speed. Moreover, this can be realized with a simple structure in which the direction of the pair of left and right shaft brackets is slightly inclined.

  According to the thrust-enhancing shaft bracket for a ship according to the second aspect of the invention, the upper half of the propeller that rotates the pair of left and right shaft brackets that suspend the bearing that supports the propeller shaft from the hull in front of the propeller and rotates with respect to the propeller shaft. The propeller thrust can be increased by using a cross-sectional shape that is asymmetrical in the direction that gives the flow opposite to the propeller rotation direction on the side, and the speed increases when sailing with the same horsepower, and sails at the same speed. This will save fuel. In addition, by performing the pair of left and right shaft brackets without tilting with respect to the flow direction, it is possible to avoid water resistance caused by tilting the shaft bracket.

  According to the thrust-enhancing shaft bracket for a ship according to the third aspect of the invention, the upper half of the propeller that rotates the pair of left and right shaft brackets that suspend the bearing that supports the propeller shaft from the hull in front of the propeller and rotates with respect to the propeller shaft. The cross section is asymmetrical in the direction of giving a flow opposite to the direction of rotation of the propeller on the side in a direction inclined in a plan view and giving a flow opposite to the direction of rotation of the propeller on the upper half side of the propeller rotating with respect to the propeller axis. By adopting the shape, the propeller thrust can be further increased, the speed is further increased when sailing with the same horsepower, and the fuel consumption is further reduced when sailing with the same speed.

  In addition, in the case of claim 4, in addition to the configuration of claims 1 to 3, the bearings for supporting the propeller shaft in front of the propeller are attached to both outer sides of the pair of left and right shaft brackets that hang from the hull and the middle thereof. Propeller thrust is achieved by placing the auxiliary fin in an aerofoil-shaped cross-sectional shape and inclining in a plan view in a direction that gives a flow opposite to the propeller rotation direction on the upper half side of the propeller rotating with respect to the propeller shaft. The speed can be further increased when navigating at the same horsepower, and the fuel consumption can be further reduced when navigating at the same speed.

  In addition, in the case of claim 5, in addition to the configuration of claims 1 to 3, the bearings for supporting the propeller shaft in front of the propeller are attached to both outer sides of the pair of left and right shaft brackets that hang from the hull and the middle thereof. Propeller thrust is further enhanced by placing the auxiliary fins in an aerofoil-shaped cross-section and tilting them in a direction that provides a flow opposite to the direction of propeller rotation on the upper half of the propeller that rotates relative to the propeller shaft. The speed is further increased when navigating with the same horsepower, and the fuel consumption is further reduced when navigating at the same speed. In addition, since the arc-shaped mounting plate with the auxiliary fins attached is fixed to the outer periphery of the bearing, and the auxiliary fins are arranged via the arc-shaped mounting plates fixed to the outer periphery of the bearing, the ship equipped with the existing propeller shaft In addition, the auxiliary fins can be easily attached, and the propeller thrust can be easily increased for existing ships.

  According to the thrust-enhancing shaft bracket for a ship according to the invention of claim 6, the auxiliary fins attached to both outer sides of the pair of left and right shaft brackets for suspending the bearing supporting the propeller shaft from the hull in front of the propeller and in the middle thereof. The thrust of the propeller can be increased by making it an aerofoil-shaped cross-sectional shape and tilting it in a direction that gives a flow opposite to the propeller rotation direction on the upper half side of the propeller that rotates with respect to the propeller shaft. The speed increases when navigating at the same horsepower, and the fuel efficiency is reduced when navigating at the same speed.

  According to the thrust augmenting shaft bracket for a ship according to the invention of claim 7, the auxiliary fins attached to both outer sides of the pair of left and right shaft brackets for suspending the bearing supporting the propeller shaft from the hull in front of the propeller and in the middle thereof. The thrust of the propeller can be increased by making it an aerofoil-shaped cross-sectional shape and tilting it in a direction that gives a flow opposite to the propeller rotation direction on the upper half side of the propeller that rotates with respect to the propeller shaft. The speed increases when navigating at the same horsepower, and the fuel efficiency is reduced when navigating at the same speed. In addition, since the arc-shaped mounting plate with the auxiliary fins attached is fixed to the outer periphery of the bearing, and the auxiliary fins are arranged via the arc-shaped mounting plates fixed to the outer periphery of the bearing, the ship equipped with the existing propeller shaft In addition, the auxiliary fins can be easily attached, and the propeller thrust can be easily increased for existing ships.

  Hereinafter, the present invention will be described more specifically based on the best mode for carrying out the invention described in the drawings.

[Best Mode-1]
Here, FIG. 1 is a schematic partial side view of a ship bottom side of a ship provided with a shaft bracket, FIG. 2A is a schematic view of a bearing suspended by the shaft bracket, as viewed from the propeller side, and FIG. 2B is a bearing. FIG. 3A is a schematic view of the shaft bracket with the auxiliary fin suspended from the plane, FIG. 3A is a schematic view of the bearing with the auxiliary fin suspended from the shaft bracket, and FIG. 3B is a suspension of the bearing with the auxiliary fin. Fig. 4A is a schematic view of the shaft bracket as viewed from above, Fig. 4A is a schematic view of another bearing with auxiliary fins suspended from the shaft bracket as viewed from the propeller side, and Fig. 4B is a suspension of other bearings with auxiliary fins. FIG. 5 is a developed view of an arcuate mounting plate to which auxiliary fins are attached. FIG.

  In the figure, the ship provided with the shaft bracket 1 has the rear bottom bottom inclined obliquely upward toward the rear. From the middle of the inclined ship bottom, the propeller shaft 2 is exposed from the hull 3 and extends in a state of being inclined slightly obliquely downward toward the rear. The propeller shaft 2 extending rearward is supported by a bearing 5 suspended from the hull by a pair of left and right shaft brackets 1 in front of the propeller 4. The front side of the propeller shaft 1 exposed from the hull is supported by a front bearing 7 suspended from the hull by a pair of left and right front shaft brackets 6 as necessary.

  The pair of left and right shaft brackets 1 are attached in a V-shaped state as viewed from the front to support the bearings 5. In other words, the left and right shaft brackets 1 are attached obliquely downward toward the center lower part of the left and right shaft brackets 1, and their lower ends are integrated with the outer periphery of the upper side of the bearing 5 by welding. The structure is suspended from above.

  The left and right shaft brackets 1 that suspend the bearing 5 that supports the propeller shaft 2 from above are arranged in a direction that gives a flow opposite to the propeller rotation direction on the upper half side of the rotating propeller 4. In other words, the pair of left and right shaft brackets 1 are disposed so as to be inclined in a plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge side 1a of the left and right shaft brackets 1 rotates with respect to the propeller shaft 4a. ing.

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. The rear edge side 1a closest to the propeller 4 of each of the left and right shaft brackets 1 is inclined to the left in the opposite direction in plan view. That is, in the plan view, when the front edge side 1b farthest from the propeller 4 of each of the left and right shaft brackets 1 is used as a reference, the rear edge side 1a is at a position moved to the left side.

  In plan view, the inclination angle β of each of the left and right shaft brackets 1 is an angle within 15 degrees at the maximum. That is, the pair of left and right shaft brackets 1 has a maximum of 15 degrees in plan view opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge side 1a of the left and right shaft brackets 1 rotates with respect to the propeller shaft 4a. It is arranged with an inclination within an inclination angle of. This is because when the inclination angle exceeds 15 degrees, the flowing water resistance accompanying the inclination of the shaft bracket 1 is higher than the thrust enhancement effect.

  By the way, auxiliary fins 81 to 83 having an aerofoil-shaped cross-sectional shape may be respectively disposed on both outer sides of the pair of left and right shaft brackets 1 and on the outer periphery of the bearing 5 in the middle thereof.

  In this case, the auxiliary fins 81 and the auxiliary fins 83 are disposed on the outer sides of the left and right shaft brackets 1, and the auxiliary fins 82 are disposed between the pair of left and right shaft brackets 1. The auxiliary fins 82 serve to protect the propeller 4 from floating objects such as driftwood. The arrangement angle θ of the auxiliary fins 81 and 83 outward from the left and right shaft brackets 1 is approximately the same as the angle θ between the left and right shaft brackets 1.

  Further, the length from the rotation center of the propeller 4 to the outer ends 81 c to 83 c of the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 is the same as or smaller than the outer end 4 b of the rotating propeller 4. That is, the length is such that it does not protrude from the outer end 4 b of the rotating propeller 4.

  Further, the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 are arranged in a direction to give a flow opposite to the propeller rotating direction on the upper half side of the rotating propeller 4. In other words, the auxiliary fins 81 to 83 are inclined with respect to the propeller shaft 4a in a plan view in a direction opposite to the propeller rotation direction on the upper half side of the propeller 4 on which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate. The

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. The rear edge sides 81a to 83a closest to the propeller 4 of the auxiliary fins 81 to 83 are inclined to the left side opposite to this in a plan view. That is, in the plan view, when the front edge sides 81b to 83b farthest from the propeller 4 of the auxiliary fins 81 to 83 are used as a reference, the rear edge sides 81a to 83a are in positions moved to the left side.

  Further, in plan view, the inclination angle γ of the auxiliary fins 81 to 83 is an angle within 15 degrees at the maximum. That is, the auxiliary fins 81 to 83 have a maximum of 15 degrees in plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate with respect to the propeller shaft 4a. It is inclined and arranged within the inclination angle of. This is because when the inclination angle exceeds 15 degrees, the flowing water resistance accompanying the inclination of the auxiliary fins 81 to 83 is higher than the thrust enhancement effect.

  The auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 may be directly attached to the outer periphery of the bearing 5 by welding, or may be attached via an arcuate mounting plate 9 fixed to the outer periphery of the bearing 5.

  When the auxiliary fins 81 to 83 are attached via the arcuate mounting plate 9, the auxiliary fins 81 to 83 are fixed to the outer peripheral surface of the arcuate mounting plate 9 by welding. Further, when the arcuate mounting plate 9 is attached to the outer periphery of the bearing 5, a cutout groove 91 is formed in the arcuate mounting plate 9 so as not to hit the pair of left and right shaft brackets 1 that suspend the bearing 5.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the propeller 4 rotates in the forward direction, for example, when the propeller 4 is rotated clockwise as viewed from the front, the hull 3 moves forward, and a water flow is relatively generated from the front toward the rear.

  As shown in the figure, the water flow in front of the shaft bracket 1 generates a water flow parallel to the propeller shaft 4a. However, since the left and right shaft brackets 1 are inclined in plan view, the water flow parallel to the propeller shaft 4a is When passing between the left and right shaft brackets 1 and the outer sides thereof, the water flow direction is changed by the left and right shaft brackets 1 inclined in plan view, and the propeller 4 behind the water flow direction is changed. Head for.

  In this case, when the auxiliary fins 81 to 83 are disposed on the outer periphery of the upper half side of the bearing 5 suspended by the left and right shaft brackets 1, the auxiliary fins 81 to 83 are inclined in plan view. When the water flow parallel to the shaft 4a passes between the left and right shaft brackets 1 and both outer sides thereof, the auxiliary fins 81 and the auxiliary fins 83 on the outer sides of the left and right shaft brackets 1 are inclined in plan view. The direction of the water flow is also changed by the intermediate auxiliary fins 82.

  As shown in the drawing, the water flow passing through the left and right shaft brackets 1 toward the propeller 4 has a leftward component opposite to the propeller 4 whose upper half moves to the right. As described above, it is known that when a flow reverse to the rotation direction of the propeller 4 is applied, the thrust of the propeller 4 is increased, and thereby the thrust of the propeller 4 is increased by the inclined left and right shaft brackets 1. be able to. Further, when the auxiliary fins 81 to 83 are disposed on the outer periphery of the bearing 5, the thrust of the propeller 4 can be further increased.

That is, the thrust of the propeller 4 can be increased with a simple structure in which the direction of the pair of left and right shaft brackets 1 for suspending the bearing 5 supporting the propeller shaft 2 from the hull 3 is simply tilted. Further, the thrust of the propeller 4 can be further increased by a simple structure in which the auxiliary fins 81 to 83 are further arranged on the outer periphery of the bearing 5 as required.

[Best Mode-2]
Here, FIG. 6 is a schematic partial side view of a ship bottom side of a ship provided with a shaft bracket, FIG. 7A is a schematic view of a bearing suspended by the shaft bracket as seen from the propeller side, and FIG. 7B is a bearing. FIG. 8A is a schematic view of the shaft bracket with the auxiliary fin suspended from the plane, FIG. 8A is a schematic view of the bearing with the auxiliary fin suspended from the propeller side, and FIG. 8B is the suspension of the bearing with the auxiliary fin. FIG. 9A is a schematic view of the shaft bracket as viewed from above, FIG. 9A is a schematic view of another bearing with auxiliary fins suspended from the shaft bracket as viewed from the propeller side, and FIG. 9B is a suspension of other bearings with auxiliary fins. FIG. 10 is a schematic view of the shaft bracket to be lowered as viewed from above, and FIG. 10 is a development view of the arcuate mounting plate to which the auxiliary fins are attached.

  In the figure, the ship provided with the shaft bracket 11 has the rear bottom bottom inclined obliquely upward toward the rear. From the middle of the inclined ship bottom, the propeller shaft 2 is exposed from the hull 3 and extends in a state of being inclined slightly obliquely downward toward the rear. The propeller shaft 2 extending rearward is supported by a bearing 5 suspended from the hull by a pair of left and right shaft brackets 11 in front of the propeller 4. Further, the front side of the propeller shaft 11 exposed from the hull is supported by a front bearing 7 suspended from the hull by a pair of left and right front shaft brackets 6 as necessary.

  The pair of left and right shaft brackets 11 are attached in a V-shaped state as viewed from the front to support the bearing 5. That is, the left and right shaft brackets 11 are respectively attached to the lower center of the left and right shaft brackets 11 while being inclined obliquely downward, and the lower ends thereof are integrated with the outer periphery of the upper side of the bearing 5 by welding. The structure is suspended from above.

  The left and right shaft brackets 11 that suspend the bearing 5 that supports the propeller shaft 2 from above are formed so that the cross-sectional shape of each shaft bracket 11 is asymmetrical with respect to the propeller shaft 4a from the front edge side 11b to the rear edge side 11a. . An imaginary center line 11e of a cross section connecting the midpoints of the left and right asymmetric side surfaces of the shaft bracket 11, that is, the left edge side surface 11c and the right edge side surface 11d, is arcuate in the propeller rotation direction on the upper half side of the rotating propeller 4. The cross-sectional shape of each shaft bracket 11 is a shape that gives a flow opposite to the propeller rotation direction on the upper half side of the rotating propeller 4.

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. A virtual center line 11e in the cross section of each of the left and right shaft brackets 11 has a shape that is bent in an arc shape on the right side in the drawing.

  In a cross section, that is, a horizontal cross section of each of the left and right shaft brackets 11, the left edge side surface 11 c is disposed substantially parallel to the propeller shaft 4 a and the right edge side surface 11 d swells in an arc shape on the right side. Further, the arc-shaped bulge of the right edge side surface 11d becomes maximum at, for example, one third of the position near the front edge side 11b, and gradually decreases toward the rear edge side 11a. Unlike the best mode-1, the left and right shaft brackets 11 are not inclined with respect to the propeller shaft 4a and are basically parallel to each other, so that no water flow resistance is generated due to the inclination.

  By the way, auxiliary fins 81 to 83 having an aerofoil-shaped cross-sectional shape may be respectively arranged on both outer sides of the pair of left and right shaft brackets 11 and the outer periphery of the bearing 5 in the middle thereof.

  In this case, the auxiliary fins 81 and the auxiliary fins 83 are disposed on the outer sides of the left and right shaft brackets 11, and the auxiliary fins 82 are disposed between the pair of left and right shaft brackets 11. The auxiliary fins 82 serve to protect the propeller 4 from floating objects such as driftwood. The arrangement angle θ of the auxiliary fins 81 and 83 outward from the left and right shaft brackets 11 is approximately the same as the angle θ between the left and right shaft brackets 11.

  Further, the length from the rotation center of the propeller 4 to the outer ends 81 c to 83 c of the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 is the same as or smaller than the outer end 4 b of the rotating propeller 4. That is, the length is such that it does not protrude from the outer end 4 b of the rotating propeller 4.

  Further, the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 are arranged in a direction to give a flow opposite to the propeller rotating direction on the upper half side of the rotating propeller 4. In other words, the auxiliary fins 81 to 83 are inclined with respect to the propeller shaft 4a in a plan view in a direction opposite to the propeller rotation direction on the upper half side of the propeller 4 on which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate. The

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. The rear edge sides 81a to 83a closest to the propeller 4 of the auxiliary fins 81 to 83 are inclined to the left side opposite to this in a plan view. That is, in the plan view, when the front edge sides 81b to 83b farthest from the propeller 4 of the auxiliary fins 81 to 83 are used as a reference, the rear edge sides 81a to 83a are in positions moved to the left side.

  Further, in plan view, the inclination angle γ of the auxiliary fins 81 to 83 is an angle within 15 degrees at the maximum. That is, the auxiliary fins 81 to 83 have a maximum of 15 degrees in plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate with respect to the propeller shaft 4a. It is inclined and arranged within the inclination angle of. This is because when the inclination angle exceeds 15 degrees, the flowing water resistance accompanying the inclination of the auxiliary fins 81 to 83 is higher than the thrust enhancement effect.

  The auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 may be directly attached to the outer periphery of the bearing 5 by welding, or may be attached via an arcuate mounting plate 9 fixed to the outer periphery of the bearing 5.

  When the auxiliary fins 81 to 83 are attached via the arcuate mounting plate 9, the auxiliary fins 81 to 83 are fixed to the outer peripheral surface of the arcuate mounting plate 9 by welding. Further, when the arcuate mounting plate 9 is attached to the outer periphery of the bearing 5, a cutout groove 91 is formed in the arcuate mounting plate 9 so as not to hit the pair of left and right shaft brackets 11 that suspend the bearing 5.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the propeller 4 rotates in the forward direction, for example, when the propeller 4 is rotated clockwise as viewed from the front, the hull 3 moves forward, and a water flow is relatively generated from the front toward the rear.

  As shown in the figure, the water flow in front of the shaft bracket 11 is parallel to the propeller shaft 4a, but the left and right shaft brackets 11 are arcuate in section when the virtual center line 11e faces the right side. Therefore, the right edge side surface 11d is always swelled in an arc shape on the right side of the left edge side surface 11c.

  For this reason, when the water flow parallel to the propeller shaft 4a passes between the left and right shaft brackets 1 and both the outer sides thereof, the water flow direction is changed by the left and right shaft brackets 11 swelled in an arc shape on the right side in a plan view. To the rear propeller 4 with the water flow direction changed.

  In this case, when the auxiliary fins 81 to 83 are disposed on the outer periphery of the upper half side of the bearing 5 suspended by the left and right shaft brackets 11, the auxiliary fins 81 to 83 are inclined in plan view. When the water flow parallel to the shaft 4a passes between the left and right shaft brackets 11 and the outer sides thereof, the auxiliary fins 81 and the auxiliary fins 83 on the outer sides of the left and right shaft brackets 11 are inclined in plan view. The direction of the water flow is also changed by the intermediate auxiliary fins 82.

  As shown in the drawing, the water flow passing through the left and right shaft brackets 11 has a leftward component opposite to the propeller 4 whose upper half side moves to the right side. As described above, it is known that when a flow reverse to the rotation direction of the propeller 4 is given, the thrust of the propeller 4 is enhanced, and the virtual center line 11e of the cross section swells in an arc shape toward the right side. The thrust of the propeller 4 can be increased by the left and right shaft brackets 11 having a shape. Further, when the auxiliary fins 81 to 83 are disposed on the outer periphery of the bearing 5, the thrust of the propeller 4 can be further increased.

That is, the cross-sectional shape of the pair of left and right shaft brackets 11 that suspend the bearing 5 that supports the propeller shaft 2 from the hull 3 is asymmetrical so that the virtual center line 11e is bent in an arc in the direction opposite to the rotation direction of the propeller 4. With this simple structure, the thrust of the propeller 4 can be increased. Further, the thrust of the propeller 4 can be further increased by a simple structure in which the auxiliary fins 81 to 83 are further arranged on the outer periphery of the bearing 5 as required.

[Best Mode-3]
Here, FIG. 11 is a schematic partial side view of a ship bottom side of a ship provided with a shaft bracket, FIG. 12A is a schematic view of a bearing suspended by the shaft bracket, as viewed from the propeller side, and FIG. 12B is a bearing. FIG. 13A is a schematic view of a shaft bearing with auxiliary fins suspended from the shaft bracket, and FIG. 13B is a schematic view of the bearing with auxiliary fins suspended. FIG. 14A is a schematic view of the shaft bracket as viewed from above, FIG. 14A is a schematic view of another bearing with an auxiliary fin suspended from the shaft bracket as viewed from the propeller side, and FIG. 14B is a suspension of another bearing with an auxiliary fin. Fig. 15 is a schematic view of the shaft bracket to be lowered as viewed from above, and Fig. 15 shows the arcuate mounting plate with auxiliary fins attached. It is a diagram.

  In the figure, the ship provided with the shaft bracket 21 has the rear ship bottom inclined obliquely upward toward the rear. From the middle of the inclined ship bottom, the propeller shaft 2 is exposed from the hull 3 and extends in a state of being inclined slightly obliquely downward toward the rear. The propeller shaft 2 extending rearward is supported by a bearing 5 suspended from the hull by a pair of left and right shaft brackets 21 in front of the propeller 4. Further, the front side of the propeller shaft 21 exposed from the hull is supported by a front bearing 7 suspended from the hull by a pair of left and right front shaft brackets 6 as necessary.

  The pair of left and right shaft brackets 21 are attached in a V-shaped state as viewed from the front to support the bearing 5. That is, the left and right shaft brackets 21 are respectively attached to the lower center of the left and right shaft brackets 21 while being inclined obliquely downward, and the lower ends of the shaft brackets 21 are integrated with the outer periphery of the upper side of the bearing 5 by welding. The structure is suspended from above.

  The left and right shaft brackets 21 that suspend the bearing 5 that supports the propeller shaft 2 from above are arranged in a direction to give a flow opposite to the propeller rotation direction on the upper half side of the rotating propeller 4. That is, the pair of left and right shaft brackets 21 are disposed so as to be inclined in a plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge side 21a of each of the left and right shaft brackets 21 rotates with respect to the propeller shaft 4a. ing.

  Further, the left and right shaft brackets 21 are formed so that the cross-sectional shape of each shaft bracket 21 is asymmetrical with respect to the propeller shaft 4a from the front edge side 21b to the rear edge side 21a. An imaginary center line 21e of the cross section connecting the midpoints of the left and right asymmetric side surfaces of the shaft bracket 21, that is, the left edge side surface 21c and the right edge side surface 21d, is arcuate in the propeller rotation direction on the upper half side of the rotating propeller 4. The cross-sectional shape of each shaft bracket 21 is a shape that gives a flow opposite to the propeller rotation direction on the upper half side of the rotating propeller 4.

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. The rear edge side 21a closest to the propeller 4 of each of the left and right shaft brackets 21 is inclined to the left in the opposite direction in plan view. That is, in the plan view, when the front edge side 21b farthest from the propeller 4 of each of the left and right shaft brackets 21 is used as a reference, the rear edge side 21a is in a position moved to the left side. Further, a virtual center line 21e in the cross section of each of the left and right shaft brackets 21 has a shape that is bent in an arc shape on the right side in the drawing.

  The left and right shaft brackets 21 are arranged such that, in plan view, the rear edge side 21a is inclined to the left side, and the left edge side surface 21c of the cross section, that is, the horizontal section, is inclined to the left side with respect to the propeller shaft 4a. 21d is inclined to the left side in a state of bulging in an arc shape on the right side. Further, the arc-shaped bulge of the right edge side surface 21d becomes maximum at, for example, one third of the position near the front edge side 21b, and gradually decreases toward the rear edge side 21a.

  In plan view, the inclination angle β of the left edge side surface 21c of each of the left and right shaft brackets 21 is an angle within a maximum of 15 degrees. That is, the pair of left and right shaft brackets 21 are viewed in a plan view opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge side 21a of the left edge side surface 21c of each of the left and right shaft brackets 21 rotates with respect to the propeller shaft 4a. In FIG. 1, the tilt angle is set within 15 degrees at the maximum. This is because when the inclination of the left edge side surface 21c exceeds the inclination angle of 15 degrees, the flowing water resistance accompanying the inclination of the shaft bracket 21 is higher than the thrust enhancement effect.

  By the way, auxiliary fins 81 to 83 having an aerofoil-shaped cross-sectional shape may be respectively disposed on both outer sides of the pair of left and right shaft brackets 21 and on the outer periphery of the bearing 5 in the middle thereof.

  In this case, the auxiliary fins 81 and the auxiliary fins 83 are disposed on the outer sides of the left and right shaft brackets 21, and the auxiliary fins 82 are disposed between the pair of left and right shaft brackets 21. The auxiliary fins 82 serve to protect the propeller 4 from floating objects such as driftwood. The arrangement angle θ of the auxiliary fins 81 and 83 located outward from the left and right shaft brackets 21 is approximately the same as the angle θ between the left and right shaft brackets 21.

  Further, the length from the rotation center of the propeller 4 to the outer ends 81 c to 83 c of the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 is the same as or smaller than the outer end 4 b of the rotating propeller 4. That is, the length is such that it does not protrude from the outer end 4 b of the rotating propeller 4.

  Further, the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 are arranged in a direction to give a flow opposite to the propeller rotating direction on the upper half side of the rotating propeller 4. In other words, the auxiliary fins 81 to 83 are inclined with respect to the propeller shaft 4a in a plan view in a direction opposite to the propeller rotation direction on the upper half side of the propeller 4 on which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate. The

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. The rear edge sides 81a to 83a closest to the propeller 4 of the auxiliary fins 81 to 83 are inclined to the left side opposite to this in a plan view. That is, in the plan view, when the front edge sides 81b to 83b farthest from the propeller 4 of the auxiliary fins 81 to 83 are used as a reference, the rear edge sides 81a to 83a are in positions moved to the left side.

  Further, in plan view, the inclination angle γ of the auxiliary fins 81 to 83 is an angle within 15 degrees at the maximum. That is, the auxiliary fins 81 to 83 have a maximum of 15 degrees in plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate with respect to the propeller shaft 4a. It is inclined and arranged within the inclination angle of. This is because when the inclination angle exceeds 15 degrees, the flowing water resistance accompanying the inclination of the auxiliary fins 81 to 83 is higher than the thrust enhancement effect.

  The auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 may be directly attached to the outer periphery of the bearing 5 by welding, or may be attached via an arcuate mounting plate 9 fixed to the outer periphery of the bearing 5.

  When the auxiliary fins 81 to 83 are attached via the arcuate mounting plate 9, the auxiliary fins 81 to 83 are fixed to the outer peripheral surface of the arcuate mounting plate 9 by welding. Further, when the arcuate mounting plate 9 is attached to the outer periphery of the bearing 5, a cutout groove 91 is formed in the arcuate mounting plate 9 so as not to hit the pair of left and right shaft brackets 21 that suspend the bearing 5.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the propeller 4 rotates in the forward direction, for example, when the propeller 4 is rotated clockwise as viewed from the front, the hull 3 moves forward, and a water flow is relatively generated from the front toward the rear.

  As shown in the drawing, the water flow in front of the shaft bracket 21 is parallel to the propeller shaft 4a, but the left and right shaft brackets 21 are inclined in plan view, and the virtual center line 21e of the cross section is arcuate. Therefore, when the water flow parallel to the propeller shaft 4a passes between the left and right shaft brackets 21 and the outer sides thereof, the water flow is inclined in a plan view and the virtual center line 21e of the cross section is bent in an arc shape. The water flow direction is changed by the left and right shaft brackets 21, and the water flow direction is changed, and the propeller 4 is moved to the rear side of the propeller 4.

  In this case, when the auxiliary fins 81 to 83 are disposed on the outer periphery of the upper half side of the bearing 5 suspended by the left and right shaft brackets 21, the auxiliary fins 81 to 83 are inclined in plan view. When the water flow parallel to the shaft 4a passes between the left and right shaft brackets 21 and the outer sides thereof, the auxiliary fins 81 and the auxiliary fins 83 on the outer sides of the left and right shaft brackets 21 are inclined in plan view. The direction of the water flow is also changed by the intermediate auxiliary fins 82.

  As shown in the drawing, the water flow passing through the left and right shaft brackets 21 has a leftward component opposite to the propeller 4 whose upper half side moves to the right side. As described above, it is known that when a flow reverse to the rotation direction of the propeller 4 is applied, the thrust of the propeller 4 is enhanced, and thereby, the virtual center line 21e is inclined and the cross section is asymmetrical in the left-right direction. The thrust of the propeller 4 can be increased by the left and right shaft brackets 21 that are bent in an arc shape. Further, when the auxiliary fins 81 to 83 are disposed on the outer periphery of the bearing 5, the thrust of the propeller 4 can be further increased.

That is, the thrust of the propeller 4 is enhanced by tilting the direction of the pair of left and right shaft brackets 21 that suspend the bearing 5 supporting the propeller shaft 2 from the hull 3 and bending the virtual center line 21e of the cross section in an arc shape. It becomes possible to do. Further, the thrust of the propeller 4 can be further increased by a simple structure in which the auxiliary fins 81 to 83 are further arranged on the outer periphery of the bearing 5 as required.

[Best Mode-4]
Here, FIG. 16 is a schematic partial side view of the bottom of a ship equipped with a shaft bracket, FIG. 17A is a schematic view of a bearing with auxiliary fins suspended by the shaft bracket, as viewed from the propeller side, and FIG. FIG. 18B is a schematic view of the shaft bracket for suspending the bearing with auxiliary fins as viewed from above, and FIG. 18A is a schematic view of another bearing with auxiliary fins suspended by the shaft bracket as viewed from the propeller side. ) Is a schematic view of a shaft bracket for suspending other bearings with auxiliary fins as viewed from above, and FIG. 19 is a developed view of an arcuate mounting plate to which auxiliary fins are attached.

  In the figure, the ship provided with the shaft bracket 31 has the rear bottom bottom inclined obliquely upward toward the rear. From the middle of the inclined ship bottom, the propeller shaft 2 is exposed from the hull 3 and extends in a state of being inclined slightly obliquely downward toward the rear. The propeller shaft 2 extending rearward is supported by a bearing 5 suspended from the hull by a pair of left and right shaft brackets 31 in front of the propeller 4. Further, the front side of the propeller shaft 31 exposed from the hull is supported by a front bearing 7 suspended from the hull by a pair of left and right front shaft brackets 6 as necessary.

  The pair of left and right shaft brackets 31 are attached in a V-shaped state when viewed from the front to support the bearing 5. In other words, the left and right shaft brackets 31 are attached obliquely downward toward the center lower part of the left and right shaft brackets 31, and the lower ends of the shaft brackets 31 are integrated with the outer periphery of the upper side of the bearing 5 by welding. The structure is suspended from above. The left and right shaft brackets 31 that suspend the bearing 5 that supports the propeller shaft 2 from above are arranged in parallel to the propeller shaft 4a.

  Auxiliary fins 8 having an aerofoil-shaped cross-sectional shape are arranged on both outer sides of the pair of left and right shaft brackets 31 and on the outer periphery of the bearing 5 in the middle thereof. The auxiliary fins 81 and the auxiliary fins 83 are disposed on the outer sides of the left and right shaft brackets 31, and the auxiliary fins 82 are disposed between the pair of left and right shaft brackets 31. The auxiliary fins 82 serve to protect the propeller 4 from floating objects such as driftwood. The arrangement angle θ of the auxiliary fins 81 and 83 on the outer side from the left and right shaft brackets 31 is approximately the same as the angle θ between the left and right shaft brackets 31.

  Further, the length from the rotation center of the propeller 4 to the outer ends 81 c to 83 c of the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 is the same as or smaller than the outer end 4 b of the rotating propeller 4. That is, the length is such that it does not protrude from the outer end 4 b of the rotating propeller 4.

  Further, the auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 are arranged in a direction to give a flow opposite to the propeller rotating direction on the upper half side of the rotating propeller 4. In other words, the auxiliary fins 81 to 83 are inclined with respect to the propeller shaft 4a in a plan view in a direction opposite to the propeller rotation direction on the upper half side of the propeller 4 on which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate. ing.

  When the propeller 4 is rotated clockwise when the propeller 4 is viewed from the rear side, the upper half side of the propeller 4 is rotated rightward in plan view as shown in the figure. The rear edge sides 81a to 83a closest to the propeller 4 of the auxiliary fins 81 to 83 are inclined to the left side opposite to this in a plan view. That is, in the plan view, when the front edge sides 81b to 83b farthest from the propeller 4 of the auxiliary fins 81 to 83 are used as a reference, the rear edge sides 81a to 83a are in positions moved to the left side.

  Further, in plan view, the inclination angle γ of the auxiliary fins 81 to 83 is an angle within 15 degrees at the maximum. That is, the auxiliary fins 81 to 83 have a maximum of 15 degrees in plan view in the direction opposite to the propeller rotation direction on the upper half side of the propeller 4 in which the rear edge sides 81a to 83a of the auxiliary fins 81 to 83 rotate with respect to the propeller shaft 4a. It is arranged with an inclination within an inclination angle of. This is because when the inclination angle exceeds 15 degrees, the flowing water resistance accompanying the inclination of the auxiliary fins 81 to 83 is higher than the thrust enhancement effect.

  The auxiliary fins 81 to 83 arranged on the outer periphery of the bearing 5 may be directly attached to the outer periphery of the bearing 5 by welding, or may be attached via an arcuate mounting plate 9 fixed to the outer periphery of the bearing 5.

  When the auxiliary fins 81 to 83 are attached via the arcuate mounting plate 9, the auxiliary fins 81 to 83 are fixed to the outer peripheral surface of the arcuate mounting plate 9 by welding. Further, when the arcuate mounting plate 9 is attached to the outer periphery of the bearing 5, a cutout groove 91 is formed in the arcuate mounting plate 9 so as not to hit the pair of left and right shaft brackets 31 that suspend the bearing 5.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the propeller 4 rotates in the forward direction, for example, when the propeller 4 is rotated clockwise as viewed from the front, the hull 3 moves forward, and a water flow is relatively generated from the front toward the rear.

  As shown in the figure, the water flow in front of the shaft bracket 31 is parallel to the propeller shaft 4a, but there are auxiliary fins 81 to the outer periphery of the upper half side of the bearing 5 suspended by the left and right shaft brackets 31. 83, and the auxiliary fins 81 to 83 are inclined in a plan view. Therefore, when the water flow parallel to the propeller shaft 4a passes between the left and right shaft brackets 31 and the both outer sides thereof, the plan view is viewed. The direction of the water flow is changed by the auxiliary fins 81, the auxiliary fins 83, and the intermediate auxiliary fins 82 on the outer sides of the left and right shaft brackets 31 that are inclined, and the propeller 4 is directed to the rear propeller 4 with the water flow direction changed.

  As shown in the drawing, the propeller 4 in which the upper half of the water flow passing through the auxiliary fins 81 and the auxiliary fins 83 on the outer sides of the left and right shaft brackets 31 and the auxiliary fins 82 in the middle of the left and right shaft brackets 31 moves to the right side. And has a component facing leftward. As described above, it is known that when a flow opposite to the rotation direction of the propeller 4 is applied, the thrust of the propeller 4 is increased, and thereby, the auxiliary fins 81 that incline outward of the left and right shaft brackets 31 and The thrust of the propeller 4 can be increased by the auxiliary fin 83 and the auxiliary fin 82 inclined in the middle.

That is, the thrust of the propeller 4 can be increased with a simple structure in which auxiliary fins 81 to 83 that are inclined in a plan view are arranged on the outer periphery of the bearing 5 that supports the propeller shaft 2.

  Note that the present invention is not limited to the best mode for carrying out the invention, and various modifications can be made without departing from the spirit of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic partial side view of a ship bottom side of a ship provided with a shaft bracket showing the best mode-1 for carrying out the present invention. (A) is the schematic which looked at the bearing suspended by the shaft bracket which shows the best form-1 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing which shows the best form-1 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with an auxiliary fin suspended by the shaft bracket which shows the best form-1 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing with an auxiliary fin which shows the best form-1 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with another auxiliary fin suspended by the shaft bracket which shows the best form-1 for implementing this invention from the propeller side. (B) is the schematic view which looked at the shaft bracket which suspends the bearing with another auxiliary fin which shows the best form-1 for implementing this invention from the plane. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a development view of an arcuate mounting plate to which auxiliary fins showing the best mode-1 for carrying out the present invention are attached. It is a general | schematic partial side view of the ship bottom side of the ship provided with the shaft bracket which shows the best form-2 for implementing this invention. (A) is the schematic which looked at the bearing suspended by the shaft bracket which shows the best form-2 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing which shows the best form-2 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with an auxiliary fin suspended by the shaft bracket which shows the best form-2 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing with an auxiliary fin which shows the best form-2 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with another auxiliary fin suspended by the shaft bracket which shows the best form-2 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing with another auxiliary fin which shows the best form-2 for implementing this invention from the plane. It is an expanded view of the arc-shaped attachment board to which the auxiliary fin which shows the best form-2 for implementing this invention was attached. It is a general | schematic partial side view of the ship bottom side of the ship provided with the shaft bracket which shows the best form-3 for implementing this invention. (A) is the schematic which looked at the bearing suspended by the shaft bracket which shows the best form-3 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing which shows the best form-3 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with an auxiliary fin suspended by the shaft bracket which shows the best form-3 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing with an auxiliary fin which shows the best form-3 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with other auxiliary fins suspended by the shaft bracket which shows the best form-3 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing with another auxiliary fin which shows the best form-3 for implementing this invention from the plane. It is an expanded view of the arc-shaped attachment board to which the auxiliary fin which shows the best form-3 for implementing this invention was attached. It is a schematic partial side view of the ship bottom side of the ship provided with the shaft bracket which shows the best form-4 for implementing this invention. (A) is the schematic which looked at the bearing with an auxiliary fin suspended by the shaft bracket which shows the best form-4 for implementing this invention from the propeller side. (B) is the schematic which looked at the shaft bracket which suspends the bearing with an auxiliary fin which shows the best form-4 for implementing this invention from the plane. (A) is the schematic which looked at the bearing with another auxiliary fin suspended by the shaft bracket which shows the best form-4 for implementing this invention from the propeller side. (B) is the schematic view which looked at the shaft bracket which suspends the bearing with another auxiliary fin which shows the best form-4 for implementing this invention from the plane. It is an expanded view of the arc-shaped attachment board to which the auxiliary fin which shows the best form-4 for implementing this invention was attached. It is explanatory drawing of thrust increase of a propeller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft bracket 1a Rear edge side 1b Front edge side 11 Shaft bracket 11a Rear edge side 11b Front edge side 11c Left edge side surface 11d Right edge side surface 11e Virtual center line 21 Shaft bracket 21a Rear edge side 21b Front edge side 21c Left edge side surface 21d Right edge side surface 21e Virtual center Line 31 Shaft bracket 2 Propeller shaft 3 Hull 4 Propeller 4a Propeller shaft 4b Outer end 5 Bearing 6 Front shaft bracket 7 Front bearing 81 Auxiliary fin 81a Rear edge side 81b Front edge side 81c Outer end 82 Auxiliary fin 82a Rear edge side 82c Outer end 83 Auxiliary fin 83a Rear edge side 83b Front edge side 83c Outer end 9 Arc-shaped mounting plate 91 Notch groove

Claims (7)

In a ship with a shaft bracket where the propeller shaft is exposed from the hull and the propeller shaft is supported by bearings suspended from the hull by a pair of left and right shaft brackets in front of the propeller, after each shaft bracket against the propeller shaft It is tilted in plan view in the direction opposite to the propeller rotation direction of the upper half side of the propeller rotating on the edge side, and each shaft bracket is arranged in a direction to give a flow opposite to the propeller rotation direction of the upper half side of the propeller rotating. Featured ship thrust augmentation shaft bracket. In a ship equipped with a shaft bracket where the propeller shaft is exposed from the hull and the propeller shaft is supported by a bearing suspended from the hull by a pair of left and right shaft brackets in front of the propeller, the cross section of each shaft bracket with respect to the propeller shaft The shape of the shaft bracket is made asymmetrical, and the virtual center line of the cross section connecting the midpoints of the left and right asymmetrical left and right edges is curved in an arc shape in the direction of propeller rotation on the upper half of the rotating propeller. A thrust-enhancing shaft bracket for a ship, characterized in that it is shaped to give a flow opposite to the propeller rotation direction on the upper half side of the rotating propeller. In a ship with a shaft bracket where the propeller shaft is exposed from the hull and the propeller shaft is supported by bearings suspended from the hull by a pair of left and right shaft brackets in front of the propeller, after each shaft bracket against the propeller shaft Inclined in a plan view in the direction opposite to the propeller rotation direction of the upper half side of the propeller rotating on the edge side, and arranging each shaft bracket in a direction giving a flow opposite to the propeller rotation direction of the upper half side of the propeller rotating, The cross-sectional shape of each shaft bracket is asymmetrical with respect to the propeller shaft, and the virtual center line of the cross-section connecting the midpoints of the left and right asymmetrical right and left edges is bent in an arc in the propeller rotation direction on the upper half side of the rotating propeller The upper half of the propeller that shapes and rotates the cross-sectional shape of each shaft bracket Augmentor shaft bracket of the ship, characterized in that the shape giving the propeller rotational direction opposite the flow. Auxiliary fins having an aerofoil-shaped cross-sectional shape are respectively arranged on both outer sides of the pair of left and right shaft brackets and on the outer periphery of the bearing in the middle thereof. The angle between the shaft brackets is the same as the angle between the propeller's center of rotation and the outer end of the auxiliary fin. The length is the same as or smaller than the outer end of the rotating propeller. 2. The propeller is rotated in a direction opposite to the propeller rotation direction on the upper half side of the propeller rotating in plan view, and each auxiliary fin is arranged in a direction to give a flow opposite to the propeller rotation direction on the upper half side of the rotating propeller. The thrust augmenting shaft bracket for a ship according to any one of? An arcuate mounting plate with an auxiliary fin having an aerofoil-shaped cross section is fixed to the outer periphery of the bearing, and an arc shape is fixed to the outer periphery of the pair of left and right shaft brackets and to the outer periphery of the bearing in the middle. Auxiliary fins are respectively arranged through the mounting plate, and the angle of arrangement of the auxiliary fins on the outer side from the left and right shaft brackets is the same as the angle between the left and right shaft brackets, and from the rotation center of the propeller to the outer end of the auxiliary fins The length of the propeller is the same as or smaller than the outer end of the rotating propeller, and is tilted in plan view in the direction opposite to the propeller rotation direction of the upper half of the propeller rotating on the trailing edge side of each auxiliary fin with respect to the propeller shaft. 4. The auxiliary fin according to any one of claims 1 to 3, wherein the auxiliary fins are arranged in a direction giving a flow opposite to a propeller rotation direction on an upper half side of the propeller that rotates. Augmentor shaft bracket of the ship. In a ship provided with a shaft bracket in which the propeller shaft is exposed from the hull and the propeller shaft is supported by bearings suspended from the hull by a pair of left and right shaft brackets in front of the propeller, both outer sides of the pair of left and right shaft brackets and Auxiliary fins having an aerofoil-shaped cross-sectional shape are arranged on the outer periphery of the intermediate bearing, respectively, and the arrangement angle of each auxiliary fin on the outer side from each of the left and right shaft brackets is made the same as the angle between the left and right shaft brackets, The propeller on the upper half side of the propeller that makes the length from the rotation center of the propeller to the outer end of the auxiliary fin the same as or smaller than the outer end of the rotating propeller and rotates the trailing edge side of each auxiliary fin with respect to the propeller shaft A plan to rotate each auxiliary fin by tilting it in a plan view in the direction opposite to the rotation direction. Augmentor shaft bracket of the ship, characterized in that arranged in the direction which gives the flow of the propeller rotational direction opposite to the half side on the Pella. An auxiliary fin having an aerofoil-shaped cross-section in a ship having a shaft bracket in which the propeller shaft is exposed from the hull and the propeller shaft is supported by bearings suspended from the hull by a pair of left and right shaft brackets in front of the propeller Are attached to the outer circumference of the pair of left and right shaft brackets, and auxiliary fins are arranged on both outer sides of the pair of shaft brackets and the outer circumference of the bearings via arcuate mounting plates fixed to the outer circumference of the bearing. The angle of the auxiliary fins on the outside from the left and right shaft brackets should be the same as the angle between the left and right shaft brackets, and the length from the rotation center of the propeller to the outer end of the auxiliary fins should be The rear edge of each auxiliary fin with respect to the propeller shaft. The propeller is tilted in a plan view in the direction opposite to the propeller rotation direction on the upper half side of the rotating propeller, and each auxiliary fin is arranged in a direction to give a flow opposite to the propeller rotation direction on the upper half side of the propeller rotating. Ship thrust-enhancing shaft bracket.

Images