JPH10119885A - Preventing device for hull - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the heel of a hull by the reaction force of the screw rotation, and to horizontally hold the hull, by mounting an additional weight movably in the width direction of the ship body, on one side part to be inclined upward by the reaction force of the rotation of a screw in the hull, through a width direction moving mechanism. SOLUTION: An additional weight 10 is installed on one side part 7 to be inclined upward by the reaction force of the rotation of a screw 5 in a hull 4, movably in a width direction 9 of the hull 4 through a width direction moving mechanism 8. The moving mechanism 8 comprises a guide 13 for guiding the additional weight 10 in the width direction 9 of the hull 4, and a pair of stoppers 14, 15 for controlling the moving quantity of the additional weight 10 in the width direction 9. The heeling of the hull 4 is prevented, and the hull 4 is horizontally held by moving the weight 10 from a center of the hull 4 to the side inclined upward, in a condition that the hull 4 is largely heeled in a direction opposite to the rotating direction 6 of the screw 5 by the reaction force of the rotation of the screw 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing lateral inclination of a hull. More specifically, the present invention relates to a hull lateral inclination prevention device which prevents lateral inclination of a hull due to a reaction force of rotation of a screw and can hold the hull horizontally.

[0002]

2. Description of the Related Art In the field of small boats such as cruisers and fishing boats, in recent years, higher horsepower and higher speeds have been promoted, and as a result, there has been a tendency to employ relatively larger screws than hulls.

Therefore, as shown in FIG. 7, when the boat is running at high speed, the reaction force of the rotation of the screw 1 is increased, and the hull 2 is greatly enlarged by the reaction force in the direction opposite to the rotation direction 3 of the screw 1. A situation such as tilting has occurred.

The lateral inclination of the hull 2 due to the reaction force of the rotation of the screw 1 may range from 7 to 10 degrees in angle.

However, in a ship employing the above-mentioned large screw 1, the hull 2
There is no means for preventing the lateral inclination of the hull 2 and keeping the hull 2 horizontal.

[0006]

As described above, there is no means for preventing the hull 2 from tilting laterally due to the reaction force of the rotation of the screw 1 and keeping the hull 2 horizontal. And had become an obstacle to speeding up.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a hull lateral inclination preventing apparatus which can prevent lateral inclination of a hull due to reaction force of rotation of a screw and hold the hull horizontally. Is what you do.

[0008]

Means for Solving the Problems To solve the above problems, the present invention uses the following means.

That is, according to the present invention, the side part 7 of the hull 4 which is tilted upward by the rotational reaction force of the screw 5 is attached to the hull 4 in the width direction 9 via the width direction moving mechanism 8.
The present invention relates to a hull lateral inclination prevention device, characterized in that an additional weight 10 is provided so as to be movable.

In this case, the width direction moving mechanism 8 may be manually operated.

Further, the width direction moving mechanism 8 includes driving devices 18 and 3
2 may be driven.

Further, the driving devices 18 and 32 receive the lateral inclination angle signal 20 from the lateral inclination amount detector 19 for detecting the lateral inclination angle of the hull 4, calculate the moving amount of the additional weight 10, The obtained additional weight moving amount adjustment signal 21 may be controlled by the arithmetic and control unit 23 which sends the signal to the driving units 18 and 32.

In addition, stabilizer fins 25 and 26 project from the left and right bottoms of the hull 4, respectively. You may make it arrange | position upward.

According to the above means, the following effects can be obtained.

By rotating the screw 5, a thrust is generated, and the hull 4 moves forward.

In order to increase the horsepower and speed, the hull 4
When a relatively large screw 5 is employed, the reaction force of the rotation of the screw 5 becomes large.
Is largely inclined in a direction opposite to the rotation direction 6 of the screw 5.

Therefore, in the present invention, the additional weight 10 positioned at the center of the hull 4 is moved laterally in the direction of the side of the side where the additional weight 10 is lifted by the side inclination, so that the hull 4 is opposed to the side inclination. The hull 4
Is prevented from laterally tilting, and the hull 2 is held horizontally.

The movement of the additional weight 10 is performed by the width direction moving mechanism 8.
May be manually operated.

Alternatively, the width direction moving mechanism 8 may be driven by a driving device 18 such as a motor.

At this time, the lateral inclination of the hull 4 is detected by the lateral inclination detector 19, and the lateral inclination angle signal 20 detected by the lateral inclination detector 19 is sent to the arithmetic and control unit 23. The movement of the additional weight 10 may be automatically controlled by calculating the movement amount of the additional weight 10 and driving the driving device 18 based on the obtained additional weight movement amount adjustment signal 21. .

Further, stabilizer fins 25 and 26 are respectively protruded from the left and right bottoms of the hull 4, and the stabilizer fins 25 and 26 are arranged downward on the side where the hull 4 is lifted to reduce the force in the direction in which the hull 4 sinks. The hull 4 is placed upwards on the side where the hull 4 sinks to generate a force in the direction in which the hull 4 is lifted. May be assisted.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention.

In the figure, 4 is a hull, 5 is a screw rotatably attached to the tail of the hull 4, and 6 is the direction of rotation of the screw 5.

In the present invention, the screw 5 in the hull 4
Side portion 7 on the side that tilts upward due to the rotational reaction force of the screw (in the figure, the screw 5 is clockwise,
Although it is on the starboard side, when the screw 5 turns counterclockwise, it goes without saying that it becomes on the port side), and the additional weight 10 can be moved in the width direction 9 of the hull 4 via the width direction moving mechanism 8. Is provided.

The installation position of the additional weight 10 may be any position such as the upper deck, the bottom of the hull 4, or the roof of a living area.
It is preferable to install the hull 4 in the rear half 12 rather than the front half 11.

The width-direction moving mechanism 8 includes, for example, a guide 13 for guiding the additional weight 10 in the width direction 9 of the hull 4 as shown in FIG. A pair of stoppers 14 and 1 for regulating the moving amount of
5, a ball screw 16 extending in the width direction 9 of the hull 4 rotatably supported between the pair of stoppers 14 and 15, and a screw hole which can be screwed to the ball screw 16 formed in the additional weight 10. 17.

The ball screw 16 may be manually rotated by a handle (not shown).
Preferably, a driving device 18 such as a motor is connected to the ball screw 16 as shown in FIG.

Further, a lateral inclination angle signal such as a screw rotational speed signal 20 from a lateral inclination amount detector such as a tachometer 19 for detecting the rotational speed of the screw 5 is input to determine the moving amount of the additional weight 10. An arithmetic and control unit 23 that sends the calculated and obtained additional weight moving amount adjustment signal 21 to the power supply system 22 of the driving device 18 may be provided.

In the figure, reference numeral 24 denotes control power sent from the power supply system 22 to the drive unit 18.

In addition, stabilizer fins 25 and 26 are protruded from the left and right bottoms of the hull 4, respectively, and the stabilizer fins 25 and 26 are directed downward on the side where the hull 4 is lifted as shown in FIG. Stabilizer fin 25)
As shown in FIG. 3, the hull 4 may be disposed upward (stabilizer fins 26) on the side where the hull 4 sinks.

The upward and downward angles of the stabilizer fins 25 and 26 may be fixed or may be changeable by an angle adjusting mechanism (not shown). When the angles of the stabilizer fins 25 and 26 are made variable, the upward and downward angles of the stabilizer fins 25 and 26 may be further changed by an angle adjustment signal from the arithmetic and control unit 23.

Next, the operation will be described.

By driving an engine (not shown) to rotate the screw 5, a thrust is generated and the hull 4 moves forward.

In order to increase the horsepower and speed, the hull 4
When a relatively large screw 5 is used as compared with the above, the reaction force of the rotation of the screw 5 becomes large, so that the hull 4 becomes large due to the reaction force of the rotation of the screw 5 during high-speed running. It will be inclined sideways in the direction opposite to the direction 6.

Therefore, according to the present invention, the additional weight 10 is laterally moved in the direction of the side of the side lifted from the center of the hull 4 to generate a rotational moment in the hull 4 in the direction opposite to the lateral inclination. Thus, the hull 4 is prevented from laterally tilting, and the hull 2 is held horizontally.

The additional weight 10 is moved by the width direction moving mechanism 8.
May be manually rotated by a handle (not shown).

Alternatively, the ball screw 16 constituting the width direction moving mechanism 8 may be rotationally driven by a driving device 18 such as a motor.

At this time, the rotation speed of the screw 5 is detected by a lateral inclination amount detector such as a tachometer 19, and the tachometer 1
9 sends a lateral inclination angle signal such as a screw rotation number signal 20 detected to the arithmetic and control unit 23, and calculates the amount of movement of the additional weight 10 by the arithmetic and control unit 23; Is transmitted to the power supply system 22 of the driving device 18 so that the control power 24 is transmitted from the power supply system 22 to the driving device 18, so that the movement of the additional weight 10 may be automatically controlled.

The amount of movement of the additional weight 10 for holding the hull 2 horizontally depends on the rotational moment of the hull 4 caused by the movement of the additional weight 10 and the hull 4 that is tilted sideways.
If an equation is established in which the sum of the restoring force acting on the screw 5 and the reaction force of the rotation of the screw 5 is balanced, it can be easily obtained by calculation.

A specific calculation formula is as follows.

First, the rotational moment of the hull 4 caused by the movement of the additional weight 10 is represented by the following equation:
The gravitational acceleration is g, the moving distance of the additional weight 10 is l, the hull 4
If the inclination angle of θ is θ, it becomes mglcos θ.

Next, the restoring force acting on the hull 4 which is tilted sideways is represented by the weight W of the hull 4 and the rotation center (center of gravity) G of the hull 4.
Let L be the distance between the metacenter M and W · L · s
in θ. Here, the meta center of the hull 4 is
The center of curvature of a curve drawn by the buoy of the hull 4 when the hull 4 is tilted sideways.

Further, assuming that the torque constant is K, the viscosity of seawater is ρ, the number of revolutions of the screw 5 is n, and the diameter of the screw 5 is D, the reaction force of the rotation of the screw 5 is K · ρ · n ² ·
The D ^5.

Therefore, mglcos θ + W · L · sin
The equation of θ = K · ρ · n ² · D ⁵ holds.

Here, considering the case where there is no additional weight 10, since the mass m of the additional weight 10 and the moving distance 1 of the additional weight 10 are m = 1 = 0, the additional weight 10 is When there is no hull 4, the inclination angle θ ₀ is θ ₀ = sin ⁻¹ (K · ρ · n ²
D ⁵ ) / (W · L).

From the above, the moving distance l of the additional weight 10 necessary for setting the inclination angle θ of the hull 4 to 0 at the time of operation of the apparatus is obtained by substituting 0 into θ, and 1 = (K · ρ · n ² · D ⁵ )
/ Mg, and the moving distance 1 of the additional weight 10 can be calculated from this equation.

In addition to the rotation speed of the screw 5, the inclination angle of the hull 4 and the speed of the hull 4 are detected to detect the additional weight 10
In this case, it is necessary to correct the amount of inclination that occurs when the hull 4 makes a turning motion, and in this case, the screw 5 that does not require such correction is required. It is the simplest and most convenient to control by the number of rotations.

The reason why it is preferable to install the additional weight 10 in the rear half 12 of the hull 4 rather than in the front half 11 is that the additional weight 10 is provided in the front half 11 of the hull 4.
This is because the front half 11 of the hull 4 is likely to sink by that much, and there is a possibility that resistance during navigation may increase.

Further, stabilizer fins 25, 26 are respectively protruded from the left and right bottoms of the hull 4, and the stabilizer fins 25, 26 are directed downward (stabilizer fin 25) on the side where the hull 4 is lifted, as shown in FIG. To generate a force in the direction of sinking, as shown in FIG.
On the sinking side, the hull 4 is urged to be horizontal by assisting the effect by the additional weight 10 by arranging it upward (stabilizer fins 26) to generate a force in a lifting direction. You may do it.

The upward and downward angles of the stabilizer fins 25 and 26 may be fixed or changeable by an angle adjusting mechanism (not shown). When the angles of the stabilizer fins 25, 26 are made variable, the upward and downward angles of the stabilizer fins 25, 26 may be changed by an angle adjustment signal from the arithmetic and control unit 23.

FIG. 4 shows a second embodiment of the present invention, in which the widthwise moving mechanism 8 is constituted by a rack 27 and a pinion 28, and the additional weight 10 is moved via the rack 27 by rotating the pinion 28. Can be moved in the width direction 9.

Except for the above, the present embodiment has the same configuration as that of the above-described embodiment, and the same operation and effect can be obtained.

In this embodiment, the width direction moving mechanism 8 is used.
Manually operating the pinion 28, driving the pinion 28 using the driving device 18, automatically controlling the driving device 18 with the arithmetic and control unit 23, and adding the weight 10 with the stabilizer fins 25 and 26. Of course, it is also possible to assist the function of.

FIG. 5 shows a third embodiment of the present invention, in which the widthwise moving mechanism 8 is constituted by a timing belt 29 and a pair of timing gears 30 and 31, and the timing belt 29 is moved to add additional weight. The weight 10 can be moved in the width direction 9.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

In the present embodiment, the width direction moving mechanism 8 is used.
The timing gear 31 is manually operated, the timing gear 31 is driven by using the driving device 18, the arithmetic and control unit 23 is automatically controlled by the driving device 18, and the additional weight is added by the stabilizer fins 25 and 26. Weight 1
Of course, it is also possible to assist the function of “0”.

FIG. 6 shows a fourth embodiment of the present invention, in which a driving device 32 such as a cylinder is used as the width direction moving mechanism 8, and the additional weight 10 is moved in the width direction 9 by expansion and contraction of the cylinder. It is made to be able to make it.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

In the figure, reference numeral 33 denotes a fluid pressure system for driving the cylinder, and reference numerals 34 and 35 denote fluid supply / discharge paths connecting the fluid pressure system 33 and the cylinder.

In the present embodiment, the additional weight 10 is moved by manually operating the driving device 32 such as a cylinder, or the driving device 32 such as a cylinder is automatically controlled by the arithmetic and control unit 23. , Stabilizer fin 2
Needless to say, the functions of the additional weight 10 can be assisted by 5 and 26.

[0062]

EXAMPLES Experiments were conducted to confirm the effects of the present invention.

According to the experiment, the total length was 10 m and the drainage amount was 4.5.
ton, a ship with a screw diameter of 0.74 m 3 per hour
When sailing at 5.5 knots, the hull is approximately 7.
It tilted twice.

Therefore, an additional weight having a weight of about 235 kg is provided, and when the hull tilts sideways by about 7.2 degrees, the additional weight is moved laterally by 1.45 m from the center of the hull width, so that the hull becomes horizontal. Confirmed to return.

From the above, it has been found that the additional weight is relatively light and the lateral movement of the additional weight is small, so that the additional weight and the widthwise moving mechanism can be mounted on the hull without difficulty. It has been confirmed that it can be operated.

Further, the same experiment as above was carried out by attaching stabilizer fins to both sides of a ship having a total length of 10 m, a displacement of 4.5 ton, and a screw diameter of 0.74 m, respectively.

The stabilizer fin has a width (dimension in the longitudinal direction of the hull) of 7 cm and a length (dimension in the side direction) of 21c.
The ship was sailed at a speed of 35.5 knots per hour.

At this time, the weight of the additional weight required to return the hull to the horizontal state is only 120 kg when the lateral movement from the hull width center is 1.45 m, as described above, and is added by the stabilizer fin. It was confirmed that the weight of the weight could be reduced by almost half.

It should be noted that the present invention is not limited only to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0070]

As described above, according to the hull lateral inclination preventing apparatus of the present invention, the lateral inclination of the hull 4 due to the reaction force of the rotation of the screw 5 can be prevented, and the hull 4 can be held horizontally. This can provide an excellent effect.

[Brief description of the drawings]

FIG. 1 is a schematic rear view of a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

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

FIG. 4 is a side view of a width direction moving mechanism according to a second embodiment of the present invention.

FIG. 5 is a side view of a width direction moving mechanism according to a third embodiment of the present invention.

FIG. 6 is a schematic rear view of the fourth embodiment of the present invention.

FIG. 7 is a rear view showing a state in which the hull is inclined sideways.

[Explanation of symbols]

 Reference Signs List 4 hull 5 screw 6 rotation direction 7 side part 8 width direction moving mechanism 9 width direction 10 additional weight 18, 32 driving device 19 tachometer (side inclination amount detector) 20 screw rotation number signal (side inclination angle signal) 21 Additional weight moving amount adjustment signal 23 Arithmetic controller 25, 26 Stabilizer fin

Continued on the front page (72) Inventor Takashi Manabe 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. Ishikawashima Harima Heavy Industries Co., Ltd. Mikado Propeller Co., Ltd.

Claims (5)

[Claims] 1. A hull (4) having a side portion (7) that is tilted upward by a rotational reaction force of a screw (5) of the hull (4) via a width direction moving mechanism (8). An apparatus for preventing lateral inclination of a hull, wherein an additional weight (10) is provided so as to be movable in a width direction (9). 2. The apparatus according to claim 1, wherein the widthwise movement mechanism is manually operated. 3. A driving device (1) comprising: a width direction moving mechanism (8);
8) The apparatus for preventing lateral inclination of a hull according to claim 1, which is driven by (32). 4. A lateral inclination angle signal (20) from a lateral inclination amount detector (19) for detecting a lateral inclination angle of a hull (4) is inputted to calculate an amount of movement of an additional weight (10). And the obtained additional weight movement amount adjustment signal (21) is transmitted to the driving device (1).
8) The drive unit (18) (32) is controlled by the arithmetic and control unit (23) sent to the (32).
The hull lateral inclination prevention device as described in the above. 5. The fins (25) and (26) project from the left and right bottoms of the hull (4), respectively, and the stabilizer fins (25) and (26) are arranged downward on the side where the hull (4) is lifted. The hull lateral inclination prevention device according to claim 1, wherein the hull (4) is disposed upward on a side where the hull (4) sinks.