JP4437252B2 - Pod type propeller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pod-type propulsion device that includes a propeller and supports a pod incorporating a motor for driving the propeller with a strut at a lower portion of a stern hull.
[0002]
[Prior art]
For example, as shown in FIG. 4, the pod type propulsion device 1 includes a propeller 2, and a pod 3 with a built-in motor is attached to the lower part of the stern hull 5 by being suspended by a strut 4, and the propeller 2 is mounted by the motor. It is a propulsion device that drives and obtains propulsive force.
The pod type propulsion device 1 includes a tractor type having a propeller 2 in front of the strut 4 and a pushing type having a propeller 2 in the rear of the strut 4 with respect to the navigation direction of the ship.
[0003]
Although not shown, the strut 4 for suspending the pod 3 is rotatably supported by a rotating device installed in the hull.
Therefore, since the pod 3 is rotated around the central longitudinal axis by rotating the strut 4 by the rotating device, it also serves as a rudder and can be rotated 180 degrees to move the ship backward.
[0004]
In addition, since the strut 4 is submerged in water, the plane cross-sectional shape is a symmetrical airfoil, and the center line is normally arranged with the ship propelling direction.
This pod type propulsion device requires a generator for driving electric power, but has the features that the degree of freedom is large in the arrangement of the engine room and the vibration is extremely small compared to the propulsion method by the diesel engine. ing.
[0005]
However, in the case of the tractor type, the wake of the propeller 2 hits the strut 4, so that lift H is generated in the same direction as the rotation of the propeller 2 as shown in FIG. 5.
This lift H makes the right and left rudder effects unbalanced, and in order to go straight, it was necessary to constantly apply the rudder.
Taking this rudder also leads to a reduction in propulsive force.
[0006]
Conventionally, as a countermeasure for this problem, there has been known a method in which fins are attached to the lower part of the pod 3 and the lift generated in the strut 4 above the pod 3 is canceled by the reverse lift generated in the fins in the lower part of the pod 3. It has been.
Moreover, in the biaxial ship provided with the two pot type propulsion devices 1, it cancels by making the rotation direction of the propeller 2 reverse right and left.
[0007]
However, in any of the above cases, it is inevitable that the propulsive force is reduced.
In the pushing type, the strut 4 does not hit the wake of the propeller 2, so this problem does not occur.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to obtain a pod-type propulsion device that has a simple configuration and suppresses the lift generated in a strut to a small level and has good steering performance.
[0009]
[Means for Solving the Problems]
In a pod-type propulsion unit equipped with a propeller and having a built-in motor for driving the propeller, suspended by a strut in the lower part of the stern hull and provided with a propeller in front of the strut in the navigation direction of the ship, In the axial direction, the strut is divided into a part where the wake of the propeller hits, a part attached to the hull which is not affected by the wake of the propeller, and a part connecting the part where the wake comes into contact with the mounting part . The propeller wake is tilted in the direction of the propeller wake so that the lift generated in the strut is kept small , and the strut mounting side of the strut is directed to the ship propulsion direction so that the propeller wake part, portion and strap to the propeller slipstream of the strut hits while connecting the mounting portion of the part and the struts of the hull hits Both the slope of the mounting portion of the hull was smoothly cut varies twisted sectional shape.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a pod type propeller strut 6 according to the invention. The strut 6 according to the present invention is divided into a part c where the wake of the propeller 2 hits, a part a which is attached to the hull 5, and a part b which connects the part c where the wake comes into contact with the attachment side part a. Has been.
And as the part c where the propeller wake flows, it is set at the same height position as the propeller radius.
[0011]
FIG. 2 shows the cross-sectional shapes of the portions a, b, and c of the strut 6. 2A shows the cross-sectional shape of the a portion, FIG. 2C shows the cross-sectional shape of the c portion, and FIG. 2B shows the cross-sectional shape at the central height position of the b portion.
The portion b is in the shape of FIG. 2B at the center, but the portion connected to the a portion is the shape of the a portion, and the portion connected to the c portion is the shape of the c portion. It is connected with a smooth twist from the cross-sectional shape.
[0012]
FIG. 3 shows the inclination of the portion where the wake of the propeller 2 hits the strut 6, that is, the c portion in the wake of the propeller.
In the drawing, X indicates the propulsion direction of the ship, and Y is an arrow indicating the rotation direction of the propeller 2.
[0013]
Thus, since the portion c of the strut 6 where the wake of the propeller 2 hits is inclined in the direction of the flow of the wake of the propeller, the portion c exists in the flow toward the flow of the wake of the propeller. The lift force generated in 6 can be kept small.
Since the strut 6 attachment side portion a to the hull is not affected by the propeller wake, the arrangement of the strut 6 in the propulsion direction X of the ship is taken into consideration.
[0014]
Further, a portion b between the portion c of the strut 6 where the wake of the propeller 2 hits and the portion a of the strut 6 attached to the hull 5 has a twisted cross-sectional shape that smoothly switches to the inclination of both a and c. Yes.
That is, the strut 6 has a shape in which the attachment side portion b facing the propulsion direction X and the portion c inclined toward the wake of the propeller 2 are twisted at the portion b connecting between them.
[0015]
In this way, by tilting the portion c of the strut 6 where the wake of the propeller 2 hits toward the wake of the propeller 2, the lift generated in the strut 6 can be reduced, and the right and left of the steering effect can be reduced. Since the unbalance can be eliminated and the amount of steering can be reduced, the pod-type propulsion device 1 can be effectively installed even in a uniaxial ship.
Moreover, it is effective even if it is adopted for a biaxial ship.
[0016]
【The invention's effect】
The present invention is a pod-type propulsion device provided with a propeller, in which a pod incorporating a motor for driving the propeller is suspended by a strut below the stern hull, and a propeller is provided in front of the strut in the navigation direction of the ship. The strut is divided in the longitudinal direction into a part where the wake of the propeller hits, a part attached to the hull which is not affected by the wake of the propeller, and a part between the part where the wake hits and the attachment part. The part of the strut where the wake of the propeller hits is tilted in the direction of the flow of the wake of the propeller so that the lift generated in the strut is kept small , and the part of the strut attached to the hull is directed toward the propulsion of the ship, portion, portions propeller slipstream struts hits while connecting the mounting portion of the part and the struts of the hull propeller slipstream hits Since the smoothly cut varies twisted cross-sectional shape on both the inclination of the mounting portion of the strut to the hull, it is possible to suppress the lift force generated in the strut to overcome the imbalance between the left and right rudder effectiveness, helm The amount can be reduced. Moreover, the reduction of the propulsive force due to the generation of lift can be suppressed.
[Brief description of the drawings]
FIG. 1 shows a strut section of a pod type propulsion device according to the present invention.
FIG. 2 is a sectional view of each part of the strut.
FIG. 3 is a view showing the strut inclination relative to the propeller wake.
FIG. 4 is a schematic view of a conventional pod type propulsion device.
FIG. 5 is a view showing the relationship between the strut and the propeller wake.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pod type propulsion device 2 Propeller 3 Pod 4 Strut 5 Stern hull 6 Strut a Strut attachment part b Strut connection part c Strut propeller wake part H Lift X Propulsion direction Y Propeller rotation direction

Claims (1)

In a pod-type propulsion unit equipped with a propeller and having a built-in motor for driving the propeller, suspended by a strut in the lower part of the stern hull and provided with a propeller in front of the strut in the navigation direction of the ship, In the axial direction, the strut is divided into a part where the wake of the propeller hits, a part attached to the hull which is not affected by the wake of the propeller, and a part connecting the part where the wake comes into contact with the mounting part . The propeller wake is tilted in the direction of the propeller wake so that the lift generated in the strut is kept small , and the strut mounting side of the strut is directed to the ship propulsion direction so that the propeller wake part, portion and strap to the propeller slipstream of the strut hits while connecting the mounting portion of the part and the struts of the hull hits Pod propulsion device, characterized in that a smooth cut varies twisted cross-sectional shape on both the inclination of the attachment portion to the hull.

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