JP4244016B2 - Mounting structure of pod propulsion device - Google Patents

Description

The present invention relates to a mounting structure for a pod propulsion device. The pod propulsion device, as marine propulsion device, which has appeared in place of the conventional screw, has a basic configuration as shown in FIG. As shown in the figure, an electric motor 112 is placed inside a torpedo-shaped pod 111, and a motor-driven propeller 113 is provided at the tip of the pod 111. The electric motor 112 receives electric power from a generator 121 in the stern. The propeller 113 exerts a driving force. In addition, a rudder-shaped strut 114 is connected to the upper surface of the pod 111, and the strut 114 is turned by a swivel 120 provided in the stern protrusion 122. As a result, the pod 111 also turns to change the course of the ship. It is like that. The present invention relates to a mounting structure for such a pod propulsion device.

  Since the pod propulsion device is a new propulsion engine that has begun to be adopted in recent years, the mounting structure of the pod propulsion device is not clearly shown in the publicly known literature.

However, the configuration used in the real ship is shown in FIG. That is, the bottom frame 123 of the stern protrusion 122 is horizontal, the pivot shaft 115 of the strut 114 of the pod propulsion device is vertically suspended, and the drive shaft 116 in the pod 111 is positioned horizontally. Accordingly, the propeller 113 rotates in the vertical plane.
By the way, while the ship is moving forward, seawater flows along the hull outer plate from the front toward the pod propulsion device. In this case, the bottom of the stern side is inclined so as to gradually rise toward the rear, so that the water stream flows backward while moving obliquely upward, as indicated by the thick arrow Y. Therefore, since a water flow does not enter at right angles to the propeller 13 of the pod propulsion device P, useless resistance is increased and the propulsion device efficiency is not good.

  In view of the above circumstances, an object of the present invention is to provide a mounting structure for a pod propulsion device that has less wasteful resistance and high propulsion unit efficiency.

The mounting structure of the pod propulsion device of the first invention is below the stern projection, and the pod propulsion device is disposed behind the stern material, and the stern frame in the stern vertical portion has a narrow vertical center portion. A buoyancy portion that extends horizontally from the vertical portion to the left and right, the buoyancy portion being located below the full load draft line in the stern vertical line portion, and the rotation trajectory of the propeller of the pod propulsion device The buoyancy part is inclined downward from the stern perpendicular to the center in the longitudinal direction of the hull so as to approach the ship bottom, and the horizontal part decreases as it approaches the ship bottom. The pod propulsion device has a shape that is inclined upward as it approaches the outside, and the pod propulsion device is provided in a rudder-shaped strut that passes through a turning shaft, a pod that is attached to the lower end of the strut, and an inside of the pod. A drive shaft, is coupled to the drive shaft consists of a propeller disposed in the front end of the pod, and the lower inclined plane of rotation of the propeller of the pod propulsion device towards the hull forward, the shape of the stern frame The pod propulsion device is attached to the bottom frame of the stern protrusion so as to face the water flow flowing along the stern.
Mounting structure of the pod propulsion system of the second invention is the first invention, before Symbol pod propulsion device, said drive shaft to said pivot axis through the strut be one that is arranged at right angles, the stern A pod propulsion device is attached to the bottom frame by tilting the bottom frame of the projecting portion downward toward the front of the hull and passing the pivot axis of the strut perpendicular to the bottom frame. .
Mounting structure of the pod propulsion device of the third invention, in the first invention, before Symbol pod propulsion device, said drive shaft to said pivot axis through the strut be one that is arranged at right angles, stern projecting Pod propulsion by providing the bottom frame of the part horizontally and forming a mounting seat that is tilted downward toward the front of the hull in part and passing the strut's swivel axis at right angles to the mounting seat A device is attached to the bottom frame.
Mounting structure of the pod propulsion unit of the fourth invention, in the first invention, provided with a bottom frame of the ship tail protrusion horizontally with respect to said bottom frame, with passing a pivot axis of said strut at a right angle, the turning of the strut The drive shaft in the pod is inclined with respect to the shaft, and the pod propulsion device is attached so that the rotation surface of the propeller is inclined downward toward the front of the hull.

According to the first aspect of the present invention, the propeller rotating surface is inclined downward and faces a water flow that flows obliquely upward from the front along the shape of the stern frame. As a result, the water flow entering the rotating surface is efficiently converted into the backward flow by the propeller, and the propulsion unit efficiency is increased.
Also in the second to fourth inventions, the rotation surface of the propeller is inclined downward toward the front of the hull, so that no wasteful resistance is generated in the water flow and the propulsion device efficiency is increased.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a mounting structure of a pod propulsion apparatus according to a first embodiment of the present invention. FIG. 2 is a rear view showing the stern structure of the ship of FIG.

In FIG. 1 and FIG. 2, P is a pod propulsion device, below the stern protrusion 17 and behind the stern material 4. In this pod propulsion vessel, the stern frame of the stern vertical line portion (the position of the II line in FIG. 1) in front of the pod propulsion device P is a vertical portion 1 having a narrow center portion, and horizontally from the vertical portion 1 to the left and right. It has a shape having a buoyancy part 2 projecting over. Reference sign d indicates a full load water line, and the buoyancy unit 2 is positioned below the full load water line and above the upper end of the rotation trajectory PL of the propeller of the pod propulsion device P. Also, the buoyant portion 2 is inclined so as to approach the vessel bottom 3 lower inclined I suited from the stern perpendicular portion at the center of the hull longitudinal direction. Lines 2a and 2b for drawing the stern frame in FIG. 2 indicate the stern frame as viewed in the direction of arrows IIa and IIb in FIG. 1, respectively. As shown by these lines 2a and 2b, the horizontal buoyancy portion 2 decreases as it approaches the ship bottom, and inclines so as to approach upward as it approaches the outside. In the case of the stern structure as described above, when the hull is moving forward, a water flow along the shape of the hull is generated, so that the water flow is generally a flow having a component directed obliquely upward toward the rear. This upward gradient is indicated by the symbol Y.

The structure of the pod propulsion device P is as follows.
The electric motor 12 placed inside the torpedo shaped pod 11 and the propeller 13 at the tip of the pod 11 are connected by a drive shaft 16. Electric power is supplied to the electric motor 12 from a generator 21 in the stern, and the propeller 13 exerts a propulsive force. A rudder-shaped strut 14 is connected to the upper surface of the pod 11, and the turning shaft 15 passing through the strut 14 is turned by a turntable 20 provided in the stern protrusion 17. As a result, the pod 11 also turns. It is designed to change the ship. Further, the turning shaft 15 in the strut 14 and the drive shaft 16 in the pod 11 intersect at a right angle.

The present invention is characterized in that the rotation surface of the propeller 13 is inclined downward. In the first embodiment, the following configuration is adopted.
The bottom frame 18 of the ship bottom protrusion 17 is inclined so as to be substantially parallel to the upward inclined flow Y. That is, the bottom frame 18 is inclined downward toward the center of the hull. The pod propulsion device P is attached to the bottom frame 18 so that the pivot shaft 15 in the strut 14 is perpendicular to the bottom frame 18 inclined downward. Since the drive shaft 16 in the pod 11 is perpendicular to the pivot shaft 15 in the strut 14, the propeller 13 will face the water flow.

  As described above, since the rotating surface of the propeller 13 is inclined downward toward the front of the hull, the propeller 13 comes to face with a water flow flowing obliquely upward from the front of the hull. No wasteful resistance is generated in the water flow, and the water flow that enters the rotating surface can be efficiently converted to the backward flow by the propeller 13, so that the propulsion efficiency is increased.

FIG. 3 is a side view of the mounting structure of the second embodiment.
In the second embodiment, the bottom frame 18 of the stern protrusion 17 is provided horizontally, and a mounting seat 19 that is inclined downward toward the front of the hull is formed in part. The pivot shaft 15 of the strut 14 of the pod propulsion device P is passed through the mounting seat 19 so as to be at a right angle. The pod propulsion device P has the same configuration as that in FIG. 1, and the drive shaft 16 is orthogonal to the turning shaft 15, so the propeller 13 is inclined downward toward the front of the hull.
Therefore, also in this embodiment, the water flow comes to face obliquely upward from the front of the hull, and no wasteful resistance is generated in the water flow within the rotation surface of the propeller 13, and the water flow entering the rotation surface is not generated. Can be efficiently converted into the backward flow by the propeller 13, so that the propulsion efficiency is increased.

FIG. 4 is a side view of the mounting structure of the third embodiment.
In the third embodiment, the bottom frame 18 of the stern protrusion 17 is provided horizontally, and the turning shaft 15 of the strut 14 of the pod propulsion device P is passed through the bottom frame 18 at a right angle. The pod propulsion device P has a different structure from that of FIG. 1, and the pod 11 is coupled to the strut 14 so that the drive shaft 16 is inclined with respect to the turning shaft 15 of the strut 14. For this reason, the rotation surface of the propeller 13 is inclined downward toward the front of the hull.
Therefore, also in this embodiment, the water flow comes to face obliquely upward from the front of the hull, and no wasteful resistance is generated in the water flow within the rotation surface of the propeller 13, and the water flow entering the rotation surface is not generated. Can be efficiently converted into the backward flow by the propeller 13, so that the propulsion efficiency is increased.

Figure 5 is a graph comparing the hull resistance of the present invention and the conventional example, R1 indicates a hull resistance of a ship according to the present invention, R100 represents a hull resistance of the conventional example of the ship shown in FIG.
The hull resistance measurement method uses a method in which the flow velocity (unit knot) is changed within the range of the used vessel speed in the circulating water tank, and the resistance force acting on the hull is measured in units of g (grams) at the load cell for each flow velocity. It was.
As a result, as shown in FIG. 6, it was revealed that the hull resistance was reduced by 5 to 10% and the present invention decreased in almost the entire hull.

It is a side view which shows the attachment structure of the pod propulsion apparatus which concerns on 1st Embodiment of this invention. It is a rear view which shows the stern structure of the ship of FIG. It is a side view which shows the attachment structure of the pod propulsion apparatus which concerns on 2nd Embodiment of this invention. It is a side view which shows the attachment structure of the pod propulsion apparatus which concerns on 3rd Embodiment of this invention . It is a graph which compares and shows the hull resistance of this invention and a prior art example. It is a side view which shows the attachment structure of the conventional pod propulsion apparatus.

Explanation of symbols

P pod propulsion device 11 pod 13 propeller 14 strut 15 swivel shaft 16 drive shaft 17 stern protrusion 18 bottom frame 19 mounting seat

Claims (4)

A pod propulsion device is located below the stern protrusion and behind the stern material.
Is the stern frame of the aft perpendicular portion, a narrow vertical section width central portion, has a buoyant portion horizontally projecting to the left and right from the vertical portion,該浮force unit, when full the aft perpendicular portion waterline It is located further below and above the upper end of the rotation trajectory of the propeller of the pod propulsion device, and the buoyancy part tilts downward from the stern perpendicular to the center in the longitudinal direction of the hull and approaches the ship bottom. It is a shape that slopes upward as it approaches the outside and the horizontal part decreases as it approaches the ship bottom,
The pod propulsion device includes a rudder-shaped strut that passes through a turning shaft, a pod that is attached to a lower end of the strut, a drive shaft that is provided inside the pod, and a pod that is connected to the drive shaft and is connected to the pod. It consists of a propeller located at the front end,
The pod propulsion device is mounted on the bottom frame of the stern protrusion so that the propeller rotation surface of the pod propulsion device tilts downward toward the front of the hull and faces the water flow flowing along the shape of the stern frame. A pod propulsion device mounting structure characterized by Before SL pod propulsion device, said drive shaft to said pivot axis through the strut be one that is arranged at right angles,
Tilting the bottom frame of the stern protrusion toward the front of the hull,
The pod propulsion device mounting structure according to claim 1, wherein the pod propulsion device is attached to the bottom frame by passing the pivot of the strut perpendicularly to the bottom frame. Before SL pod propulsion device, said drive shaft to said pivot axis through the strut be one that is arranged at right angles,
The bottom frame of the stern protrusion is provided horizontally, and a mounting seat that is inclined downward toward the front of the hull is formed in part.
The pod propulsion device mounting structure according to claim 1, wherein the pod propulsion device is attached to the bottom frame by passing the pivot of the strut at a right angle with respect to the mounting seat. Provided bottom frame of the ship tail protrusion horizontally,
The strut pivot shaft is passed through the bottom frame at a right angle, and the drive shaft in the pod is tilted with respect to the strut pivot shaft so that the rotation surface of the propeller tilts downward toward the front of the hull. The pod propulsion device mounting structure according to claim 1, wherein the pod propulsion device is mounted.