JP2888759B2 - Marina type shilling rudder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marina type shilling rudder.

[0002]

2. Description of the Related Art Conventionally, in particular, in a relatively large vessel generally equipped with a mariner-type rudder, it is possible to improve fuel-handling performance and course stability during navigation in the ocean, thereby saving fuel consumption. At the same time, in harbors and narrow waterways, there is an increasing demand for rudders that can improve the turning characteristics of the hull and easily avoid the danger of collision.

A conventional mariner type rudder is shown in FIGS.
It is as shown in FIG. 5 to 6, the rudder plate 50 has a normal wing cross section in a horizontal cross section, that is, a convex streamline as a whole, and a top portion is rotatable via an upper pintle 53 on a skeg 52 provided on a stern hull 51. The horn 54 has an intermediate portion rotatably supported via a lower pintle 55 on a horn 54 projecting downward from the stern hull 51 to approximately the center of the rudder plate 50. A rudder shaft 56 is connected to the top of the rudder plate 50. The skeg 52 has an integral shape with the horn 54 and, like the rudder plate 50, has a horizontal cross section having a normal wing cross section, that is, a convex streamline as a whole. The skeg 52 guides the water flow backward so that the water flow flowing along the surface of the horn 54 does not generate a vortex behind the horn.

As shown in FIG. 7, there has been a structure in which the upper pintle 53 is eliminated, and the top of the rudder is directly rotatably supported by the rudder shaft 56.

[0005]

However, the conventional mariner-type rudder has a problem in that a horizontal cross-sectional profile is a wing cross-section, that is, a convex streamline as a whole, so that a moment for turning the hull is generated. However, only the water pressure acting perpendicularly to the control surface can be used, and the skeg is fixed, so that it does not contribute to the generation of the above-mentioned moment, but acts as a resistance.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a marina-type shilling rudder having high lift characteristics and excellent turning performance.

[0007]

In order to solve the above-mentioned problems, a marina-type shilling rudder of the present invention has a top portion of a rudder plate rotatably supported on a stern hull via an upper pintle, and an intermediate portion of the rudder plate. A rudder having a portion rotatably supported via a lower pintle on a horn projecting downward from the stern hull to approximately the center of the rudder plate, and a rudder shaft connected to the top of the rudder plate;
In the horizontal cross section of the rudder including the horn in the neutral state and the upper rudder plate located behind the horn, the front edge of the horn has a semicircular shape, and the upper rudder plate located behind the horn has a sectional width. Gradually decreases from the maximum width to reach the minimum width, and then gradually increases the cross-sectional width over a relatively short time in the bow-sail direction to the trailing edge of the rudder plate. The front edge of the lower rudder plate has a semicircular shape, and the intermediate portion that follows the front edge gradually decreases the cross-sectional width from the maximum width toward the rear in the bow and stern direction to reach the minimum width. It has a shape that gradually increases in cross-sectional width over a relatively short time in the forward and aft direction to the trailing edge, and has a top end plate and a bottom end plate that protrude in the sideward direction at the top and bottom of the rudder plate, and is provided above the top end plate. The upper pintle and rudder located behind the horn It is obtained by a structure in which a movable skeg covering the.

In a marina type shilling rudder according to the present invention, a rudder plate is rotatably supported on a rudder shaft at a top portion, and an intermediate portion of the rudder plate is pintled on a horn projecting downward from the stern hull to approximately the center of the rudder plate. A rudder shaft rotatably supported via a rudder shaft, the rudder shaft being connected to the top of the rudder plate, and a horizontal cross section of the rudder including a horn in a neutral state and an upper rudder plate located behind the horn. , The front edge of the horn is semicircular, and the upper rudder, located behind the horn, gradually reduces the cross-sectional width from the maximum width to the minimum width, and then to the bow-tail direction, which reaches the trailing edge of the rudder plate Has a shape that gradually increases the cross-sectional width over a relatively short period of time, and in the horizontal cross section of the lower rudder plate, the front edge of the lower rudder plate forms a semicircle,
The intermediate part that continues to the front edge part is gradually reduced in cross section width from the maximum width to the rear part in the forward and rearward direction to reach the minimum width, and then cross section for a relatively short time in the bow and tail direction to the trailing edge of the rudder plate. A movable skeg that has a shape that gradually increases in width, is provided with a top end plate and a bottom end plate that protrude in the side direction on the top and bottom of the rudder plate, and is located above the top end plate and located behind the horn and covers the rudder shaft. Is provided.

[0009]

According to the above construction, when the ship proceeds straight ahead at the rudder neutral position, the top end plate and the bottom end plate provided on the rudder plate are moved between the propeller wake and the movable skeg and the rudder plate. This prevents the water flow from escaping to the outside of the rudder plate by enclosing the wake of the propeller, so that laminar flow separation hardly occurs and the propulsion efficiency is increased. Further, at the time of steering, the wake of the propeller is confined between the top end plate and the bottom end plate, and the wake of the propeller drifts along the concave surface formed on the surface of the rudder plate. Generates hull turning moment.

The movable skeg prevents the rudder shaft and the upper pintle from becoming resistant to the water flow, and guides the water flow backward so that the water flow flowing along the surface of the horn does not create a vortex behind the horn. . The movable skeg is displaced together with the rudder plate at the time of steering to cause the wake of the propeller to drift, so that it is possible to contribute to the generation of a turning moment during turning.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, the rudder plate 1 is rotatably supported on the stern hull 3 via an upper pintle 2 at the top,
An intermediate portion of the rudder plate 1 is rotatably supported via a lower pintle 5 on a horn 4 projecting downward from the stern hull 3 to approximately the center of the rudder plate 1. A rudder shaft 6 is provided on the top of the rudder plate 1.
Are connected.

The rudder plate 1 has the shape of a high lift rudder. That is, in the horizontal section of the rudder including the horn 4 in the neutral state of the rudder and the upper rudder plate 1a of the rudder plate 1 located behind the horn 4, the front edge of the horn 4 has a semicircular shape, The upper rudder plate 1a located at the rear is gradually reduced in cross-sectional width from the maximum width toward the rear in the bow-stern direction to reach the minimum width, and thereafter has a relatively small cross-sectional width in the bow-sail direction to the trailing edge of the rudder plate. Has a gradually increasing shape.

In the horizontal cross section of the lower rudder plate 1b, the front edge of the lower rudder plate 1b has a semicircular shape, and the middle part continuous with the front edge gradually decreases the cross sectional width from the maximum width toward the rear in the bow and stern direction. To a minimum width, and then gradually increases the cross-sectional width over a relatively short time in the aft direction to the trailing edge of the rudder 1.

A top end plate 7 and a bottom end plate 8 are provided at the top and bottom of the rudder plate 1 so as to protrude toward the side of the ship. Above the top end plate 7, the upper pintle 2 and the rudder are located behind the horn 4. A movable skeg 9 covering the shaft 6 is fixedly provided on the top end plate 7. The movable skeg 9 may be formed so that its horizontal cross section has a normal blade cross section, that is, a convex streamline shape as a whole, or may have the same shape as the rudder plate 1.

The operation of the above configuration will be described below. When the rudder is in the neutral position while the ship is moving straight, the wake of the propeller flows along both the left and right surfaces of the movable skeg 9 and the rudder plate 1. At this time, the top end plate 7 and the bottom end plate 8 provided on the rudder plate 1 seal the wake behind the propeller therebetween to prevent the water flow from flowing out of the rudder plate 1, so that laminar flow separation hardly occurs. , The propulsion efficiency increases. The movable skeg 9 covers the rudder shaft 6 and the upper pintle 2 to prevent the rudder shaft 6 and the upper pintle 2 from becoming a resistance to the water flow, and the water flow flowing along the surface of the horn 4 is The water flow is guided backward so as not to generate a vortex.

Further, at the time of steering, an angle is given to the rudder plate 1, and a difference in water pressure acting on both the left and right surfaces of the rudder plate 1 due to the wake of the propeller causes the hull to turn. At this time, the wake of the propeller flows in a state of being confined between the top end plate 7 and the bottom end plate 8 and drifts along the concave surface formed on the surface of the rudder plate. Generates hull turning moment. The movable skeg 9 is displaced together with the rudder plate 1 during steering to make the wake of the propeller drift, so that it is possible to contribute to the generation of a turning moment during turning.

FIG. 4 shows another embodiment of the present invention. In this configuration, the upper pintle is not used unlike the previous embodiment, and the rudder plate 1 is rotatable on the rudder shaft 11 at the top. It is supported. Other functions and effects are the same as those of the previous embodiment.

[0018]

As described above, according to the present invention, the propeller wake is enclosed between the top end plate and the bottom end plate, and the hydraulic force of the propeller wake can be effectively applied to the rudder plate. By drifting along the concave surface formed on the rudder plate surface, the reaction force acts more effectively and a large hull turning moment can be generated. In addition, the movable skeg surrounds the propeller wake around the rudder shaft to reduce resistance, and can contribute to generation of a turning moment during turning by displacing with the rudder plate during steering.

[Brief description of the drawings]

FIG. 1 is an overall side view of a marina type shilling rudder showing one embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is an overall side view of a marina-type shilling rudder showing another embodiment of the present invention.

FIG. 5 is an overall side view of a conventional marina rudder.

FIG. 6 is a view as viewed in the direction of arrows CC in FIG. 5;

FIG. 7 is an overall side view of another conventional marina rudder.

[Explanation of symbols]

 Reference Signs List 1 rudder plate 1a upper rudder plate 1b lower rudder plate 2 upper pintle 3 stern hull 4 horn 5 lower pintle 6 rudder shaft 7 top end plate 8 bottom end plate 9 movable skeg

Claims (2)

(57) [Claims] 1. A horn that has a top portion of a rudder plate rotatably supported on a stern hull via an upper pintle, and a middle portion of the rudder plate has a lower pintle attached to a horn projecting downward from the stern hull to approximately the center of the rudder plate. A rudder shaft rotatably supported via a rudder shaft, the rudder shaft being connected to the top of the rudder plate, and a horizontal cross section of the rudder including a horn in a neutral state and an upper rudder plate located behind the horn. , The front edge of the horn is semicircular, and the upper rudder, located behind the horn, gradually reduces the cross-sectional width from the maximum width to the minimum width, and then to the bow-tail direction, which reaches the trailing edge of the rudder plate The cross section of the lower rudder plate has a semi-circular front edge and a middle part that is continuous with the front edge of the lower rudder in the horizontal cross section of the lower rudder plate. Gradually reduce the cross-sectional width from the maximum width toward the rear A top end plate and a bottom that reach a minimum width and then gradually increase in cross-sectional width over a relatively short time in the aft and aft direction to the trailing edge of the rudder plate, and project from the rudder plate at the top and bottom in the sideward direction. An end plate is provided, above the top end plate of the rudder plate , located behind the horn, covering the upper pintle and the rudder shaft, and a vortex flows through the water flowing along the surface of the horn.
A marina-type shilling rudder characterized by a movable skeg that guides backward so as not to occur . 2. A rudder plate is rotatably supported on a rudder shaft at a top portion, and an intermediate portion of the rudder plate is rotatably supported via a pintle on a horn protruding downward from the stern hull to approximately the center of the rudder plate. The rudder shaft is connected to the top of the rudder plate, the rudder shaft is connected, and in the horizontal section of the rudder including the horn in the neutral state and the upper rudder plate located behind the horn, the front edge of the horn is The upper rudder plate, which is semi-circular and is located behind the horn, gradually reduces the cross-sectional width from the maximum width to the minimum width, and then cross-sections for a relatively short time in the bow and aft direction to the trailing edge of the rudder plate In the horizontal cross section of the lower rudder, the front edge of the lower rudder has a semicircular shape, and the middle part that is continuous with the front edge has a cross-sectional width toward the rear in the bow-stern direction. Gradually decreases from the maximum width to the minimum width, and then The shape of the cross section gradually increases over a relatively short time in the bow-sail direction up to the trailing edge of the rudder plate, and the top and bottom of the rudder plate are provided with top and bottom end plates that protrude in the sideward direction, and the rudder plate The water flowing along the surface of the horn, covering the rudder axis, located behind the horn
A marina-type shilling rudder comprising a movable skeg for guiding a flow backward so as not to generate a vortex .