JPS61150898A - Vessel maneuvering device - Google Patents

Abstract

PURPOSE:To allow the steering of a rudder to function also as a side thruster, by furnishing a flap at each of the two rudders installed behind the propeller. CONSTITUTION:A pair of rudders 1A, 1B are installed behind a propeller 2, and each of them is equipped with a flap 5A, 5B at its tail end. The flaps 5A, 5B can be operated by a drive mechanism, wherein enlarging the rotational angle of each flap permit them to function also as a side thruster.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ship handling system, and more specifically, a pair of helical propellers arranged symmetrically with respect to a vertical plane passing through the central axis of the helical propeller. This invention relates to a ship maneuvering device equipped with a rudder.

Prior art and its problems A ship steering system consisting of a pair of rudders arranged symmetrically behind a helical propulsion device has been known as a two-rudder system and is installed on ships navigating shallow waters. However, the purpose of the conventional two-rudder system was simply to increase the flooded area of the rudder, and I believe that no detailed consideration was given to the structure and effects of each individual rudder. Since a two-rudder requires modification of the stern structure and is expensive, it is desirable to have a system that not only improves steering performance but also provides significant benefits in terms of ship handling.

The inventor of this application previously developed a rudder equipped with flaps that are automatically driven by the operation of the main rudder, and on March 2, 1981,
Published in the patent application dated 4th (Japanese Unexamined Patent Publication No. 58-16449)
(See Publication No. 8). The rudder described in this publication not only generates sufficient steering force by operating the flaps even when the rudder angle of the main rudder is minute, but also generates a steering force with a large component force in the transverse direction. can. Therefore, if the rudder disclosed in the above-mentioned publication is used as a two-blade rudder, it is thought that it can be used as a so-called "side thruster" by generating large water pressure in the width direction of the ship and in a desired direction during steering.

The present invention contemplates the development of a twin rudder that can serve as a side thruster by improving the performance of the individual rudders used in the twin rudder.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ship maneuvering device consisting of two rudders that can be used as a side thruster and capable of leaving the shore with its own blade without using a tug.

The above object of the present invention is to provide a ship maneuvering device comprising a pair of rudders disposed behind a helical propulsion device with respect to a vertical plane passing through the central axis of the propulsion device, each rudder being connected to the propulsion device. A ship maneuvering device comprising a rudder with a flap attached at a position spaced apart from the vertical plane in the width direction of the ship by a distance having a predetermined ratio '('(<1) with respect to the radius R. This is achieved by

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to embodiments shown in the accompanying drawings.

As shown in Figures 1.2 and 3, the ship maneuvering device 10 of this invention is arranged symmetrically with respect to the vertical plane mXX passing through the center line 12 of the helical propulsion device 2 at the rear of the helical propulsion device 2. It is equipped with a pair of rudders IA and IB. The rudders IA and IB are
Rudder shafts 4A and 4B each hanging from the stern structure 3 of the hull
is fixed to the bottom edge of. Each rudder shaft 4A14B is placed at a position a predetermined distance dd dl14 from the vertical plane XX. The distance 111ict is chosen to have a predetermined ratio of 1 to the diameter R of the helical thruster 2. In the embodiment of the invention, the value η=0.7 is chosen. Each rudder IA.

IB has flaps 5A and 5B attached to its tail end, respectively. 6A and 6B are each flap 5A.

The pivot pins that attach 5B to the tail ends of rudders IA and IB are shown.

FIG. 4 shows a typical example of a rudder with individual flaps installed as a component of the two-blade rudder 10 of FIG. This rudder IA has flaps 5 even when the rudder angle is small.
The structure is such that rudder A rotates at a large angle by a light amount to generate the required rudder force, and rudder IA is used except when making a large course change during navigation.
is operated only slightly, and the course is mainly kept by the flap. Since the rudders lAt1B on both the left and right sides have exactly the same configuration, the rudder I on the right side in Figure 2
A will be explained. Reference number 7 indicates a drive mechanism for the flap 5A. A pressure receiving fitting 8 protrudes upward from the upper end of the flap 5A in the vertical center plane of the flap 5A.
is provided with a projecting portion 8A on the right side that extends beyond the center INYY of the bottle 6A and projects toward the bow side. , a pair of five-shaped rotating arms 11A, IIB are provided with horizontal portions that sandwich the overhang portion 8A from both sides.

The vertical portions of the rotating arms 11A and IIB are connected to a pair of clamping plates 1 that sandwich a vertical fixed shaft 9 hanging from the stern structure 3 from both sides.
$A e I It is tightened more than FjBK. IS
indicates a tightening bolt. This structure of the flap drive mechanism 7 allows the distance between the bottle 6A and the fixed shaft 9 to be smaller than that of the conventional rudder.

The main features of the rudder shown in Figure 1 are as follows.

Rudder area A=HXC Aspect ratio = A/C2 flap・
Cord length C=0・25C rudder shaft position
"o = 0.40C Diameter of helical thruster R = 3.420M During operation, the ship is assumed to be stationary, and both rudders IA and IB of the ship maneuvering device of the present invention are moved simultaneously in the same direction and at the same angle α.
It is assumed that when the flaps 5A and 5B are rotated by 1, the flaps 5A and 5B are perpendicular to the stern line XX of the ship (see the dotted chain lines in Figures 2 and 6). In such a case, after the thruster wake collides with the rudder IA and the flap 5A, it is deflected in a direction substantially perpendicular to the ship's tail line XX. Therefore, a thrust force that pushes the stern in a direction perpendicular to the bow and stern @XX can be obtained without pushing the hull in the direction of the bow and stern line XX. That is, the ship maneuvering device 10 of the present invention can be operated as a side thruster.

Ordinary dedicated side thrusters must be installed in a limited space between the water line and the center line of the thruster shaft, which makes it difficult to obtain sufficient capacity and complicates the hull structure. There are other problems, such as increasing equipment costs and increasing equipment costs. On the other hand, when using the ship maneuvering device of the present invention, there is an advantage that seawater below the level of the propeller shaft can be used. The ship steering device of the present invention is used as a normal rudder after leaving port, but
Large-angle steering is not necessary except when changing course. The device of the present invention has a ratio β between the rudder angle α of the rudder IA and the rotation angle β of the flap 5A.
/α is large at the beginning of α, so even if the rotation of the rudder IA is very small during sailing, effective course keeping can be carried out by operating only flap 5A, so when changing course by a large angle. Other than that, it's almost stationary. Main rudder plate or rudder I
It is also an advantage of the device of the invention that A and IB act as fins to rectify the propulsion wake, thereby improving the efficiency of the propulsion device.

[Brief explanation of the drawing]

Figure 1 is a side view showing the device of the present invention, Figure 2 is a plan view taken from the horizontal line ■-■ in Figure 1, Figure 3 is a front view taken from line ■-m in Figure 2; 4 is a perspective view showing the main parts of the apparatus shown in FIG. 1, FIG. 5 is a detailed sectional view of the main parts shown in FIG. 4, and FIG. 6 is a front view showing the operating position of the apparatus shown in FIG. IA, IB Rudder 2 with flap
Helical thruster 3 Stern structure 4A, 4B Rudder shaft 5A, 5
B flaps 6A, 6B
Rotating pin 7 Flap drive mechanism 8 Pressure receiving fitting 9 Fixed shaft 10 Device of the present invention 11A I
I IB Rotating arm IA * l *
B Tightening plate ls Bolt

Claims (1)

[Claims] A ship maneuvering device consisting of a pair of rudders arranged symmetrically with respect to a vertical plane passing through the central axis of the helical thruster behind the helical thruster, each rudder having a predetermined radius R of the thruster. A ship maneuvering device comprising a rudder with a flap attached at a position spaced apart from the vertical plane in the width direction of the ship by a distance having a ratio η (η<1).