JP2003291889A - Propulsion unit for ship and ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propulsion unit for a ship and a ship, enabling improvement in driving force and securing of redundancy while restraining increase in work process and the number of part items in fitting, and restraining complicatedness of shape of the ship. <P>SOLUTION: This propulsion unit 14 for the ship is provided with a plurality of propeller devices 26A, 26B, whereby the driving force can be improved as compared with the unit having one propeller device, and the redundancy is secured. Since one strut 24 is provided for the plurality of propeller devices 26A, 26B, increase in work process for fitting can be restrained as compared with the conventional case where a plurality of propulsion units 52 are provided on the ship body 54. Further, the number of parts in fitting the propeller devices 26A, 26B of the same number to the ship can be reduced. Further the shape of the ship body can be restrained from being complicated as compared with the case where the propulsion unit is fitted through a plurality of struts. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship propulsion device and a ship.

[0002]

2. Description of the Related Art Conventionally, as a propulsion device for a ship, for example, there is one disclosed in Japanese Patent Laid-Open No. 5-77784. The propulsion device disclosed in this publication includes one strut and one propeller device. This thruster
It is attached to the stern of the ship via the strut in a state of being capable of turning 360 degrees around the axis of the strut. Therefore, a ship equipped with this propulsion device can navigate in either the bow direction or the stern direction.

[0003]

However, in the above-mentioned conventional propulsion device, it is necessary to provide a plurality of such propulsion devices in the hull in order to improve the propulsive force of the ship and ensure the redundancy of the propulsion device. FIG. 6 shows an example of a ship 50 provided with two propulsion devices 52 that extend in the normal lateral direction of the hull 54.
Therefore, the work process for mounting the
There was a problem that the number would increase compared to when it was installed on the machine.
Further, for example, in the case of turning the propulsion device, the number of devices (rotating devices) 56 for turning the propulsion device is the same as that of the propulsion devices 52 (for example, two), which causes a significant increase in the number of parts. It will be. In addition, an extra space for mounting the propulsion device is required, which causes a problem that the shape of the hull becomes complicated.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to improve the propulsive force while suppressing the increase of the work process and the number of parts at the time of mounting and the complexity of the hull shape. An object of the present invention is to provide a ship propulsion device and a ship in which the redundancy of the propulsion device is ensured.

[0005]

A marine vessel propulsion device according to the present invention comprises one strut and a plurality of propeller devices, each propeller device including a propeller, a motor for driving the propeller, and a propeller device for driving the propeller device. A housing for housing the motor,
The central axes of rotation of the propellers of the plurality of propeller devices are offset from each other.

In this marine vessel propulsion device, since a plurality of propeller devices are provided, propulsion power is improved and redundancy is ensured as compared with a propulsion device having one propeller device. Since there is only one strut for a plurality of propeller devices, the installation work is more difficult than the case where a plurality of conventional propulsion devices, in which one propeller device is attached to one strut, are attached to the hull. It is possible to suppress an increase in the number of steps. Further, it is possible to reduce the number of parts when attaching the same number of propeller devices to the ship. Further, since the number of the struts is one, it is possible to prevent the shape of the hull from becoming complicated as compared with the case where the propulsion device is attached via a plurality of struts.

It is preferable that the plurality of propeller devices include a pushing type propeller device and a tractor type propeller device. In this case, the propeller of the pushing type propeller device and the propeller of the tractor type propeller device do not come into contact with each other, so that the rotation center axes of the propellers can approach each other. As a result, the size of the propulsion device can be reduced.

Further, it is preferable that two propeller devices are provided and the propellers of the propeller devices rotate in opposite directions. By doing so, the stability of navigation of the ship can be improved.

A ship according to the present invention includes the above-mentioned ship propulsion device.

In this vessel, since the propulsion device is provided with a plurality of propeller devices, the propulsion force is improved and the propeller device redundancy is secured as compared with a vessel having one propeller device. . And in the propulsion device of this ship, one strut is provided for a plurality of propeller devices.
Therefore, it is possible to suppress an increase in the number of work steps for mounting, as compared with a case where a plurality of conventional propulsion devices in which one propeller device is attached to one strut are attached to the hull. . Further, it is possible to reduce the number of parts when attaching the same number of propeller devices to the ship. Furthermore, due to the single strut,
It is possible to prevent the shape of the hull from becoming complicated as compared with the case where the propulsion device is attached via a plurality of struts.

Further, it is preferable that the marine vessel propulsion device is mounted so as to be rotatable about a shaft of the strut within a predetermined angle range. In this case, the propulsion direction of the ship can be changed by turning the propulsion device about the axis of the strut.

[0012]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. Further, the dimensional ratios in the drawings do not always match those described. FIG. 1 is a right side view showing the configuration of a ship provided with a ship propulsion device according to the present embodiment.

As shown in FIG. 1, this ship (for example, an icebreaker) 10 has a hull 12 and a pod-type propulsion device (hereinafter, simply referred to as “propulsion device”) 14 attached to the hull 12.
It has and.

The hull 12 includes a bow portion 16 and a central portion 1 of the hull.
8 and a stern portion 20. This bow 16
The shape is designed so as to reduce the propulsion resistance in open water. For example, the underwater portion has a Barbus bow shape in which the portion is projected forward.

The structure of the central portion 18 of the hull differs depending on the type of the ship 10. That is, when the ship 10 is a container ship, a plurality of holds are formed inside the hull center part 18, and when the ship 10 is a crude oil tanker, a plurality of oil tanks are formed inside the hull center part 18. It

The stern portion 20 has a mounting portion 22 for mounting the propulsion device 14 and an overhang portion 23. The outer surface of the stern portion 20 functions as an ice breaking surface for carrying out ice breaking when sailing in the stern direction.

The propulsion device 14 is attached to the attachment portion 22 of the stern portion 20. The propeller 14 includes one strut 24 and two propeller devices 26A and 26B. In this way, the propulsion device 14 and the hull 12 are
Since it is attached via one strut 24, most of the work steps that need to be performed twice can be completed once in the conventional ship in which two propeller devices are attached using two struts. . In general, when applying a propulsion device to a ship equipped with an ice breaking surface on the stern, it is difficult to make the shape suitable for ice breaking,
As described above, in the boat 10 in which the propulsion device 14 is attached to the hull 12 via one strut,
It is possible to keep the stern portion 20 in a shape suitable for crushing ice.

More specifically, as shown in FIGS. 2 and 3, the propeller devices 26A and 26B have a Y-shaped cross section.
It is attached to the hull 12 via a single strut 24 that is in the shape of a letter. The struts 24 can be swung within a range of ± 180 degrees about the rear normal α by a rotating device 28 provided inside the hull 12. That is, the rear normal α and the rotation axis of the strut 24 coincide with each other. In this way, the propulsion device 14 is turned around the rear vertical line α and directed in an arbitrary direction, whereby the marine vessel 1
The propulsion direction of 0 will be controlled freely. That is, for example, by turning the propeller 14 by 180 degrees, it is possible to reverse the navigation direction of the ship.
The rear perpendicular α usually refers to the central axis of the rudder post or rudder head member, but in this embodiment, the propeller 14 also has a rudder function.
Consider the axis of rotation of the strut 24.

The propeller devices 26A and 26B are respectively
Propellers 30A and 30B and these propellers 30A and 30
Motors 34A, 34B for driving B, and cocoon-shaped casings 36A, 36B for accommodating the motors 34A, 34B
And have. Below, propeller 30A and propeller 3
The virtual axis that is the center of rotation of 0B is the center of rotation β
1 and the rotation center axis β2. Cocoon case 36A, 36
B is the rotation center axes β1 and β2 of the propellers 30A and 30B.
Extending in the direction, the housings 36A, 36B and the propeller 30A,
30B is coupled substantially coaxially with the rotation center axes β1 and β2 as a reference. Then, these rotation center axes β1,
The propeller device 26A and the propeller device 26B are arranged in parallel so that β2 is parallel. Further, the propeller device 26A and the propeller device 26B are arranged such that their rotation center axes β1 and β2 are located in the same plane orthogonal to the rear perpendicular α.

Here, the distance D1 between the two rotation center axes β1 and β2 is obtained by adding the radius R _A of the orbit circle 38A at the tip of the propeller 30A and the radius R _B of the orbit circle 38B at the tip of the propeller 30B. Is also getting longer. Therefore, the propellers 30A and 30B rotate without making contact with each other. The drive of the motors 34A and 34B is transmitted to the propellers 30A and 30B via a connecting shaft (not shown), and the propellers 30A and 30B rotate.

The propeller devices 26A and 26B are so-called tractor type propeller devices in which the propellers 30A and 30B are attached to the front portions of the housings 36A and 36B, and the strut 2 is rotated by the rotation of the propellers 30A and 30B.
Propeller wake is ejected to the side of 4 to obtain propulsive force. The rotation direction of the propeller 30A of the propeller device 26A and the rotation direction of the propeller 30B of the propeller device 26B are opposite. In this way, two propellers 30A,
By reversing the direction of rotation of 30B, strut 2
Forces acting in the direction (direction of arrow X in FIG. 3) orthogonal to the navigation direction (propulsion direction) of the ship 10 acting on the ship 4 are offset. Thereby, the navigation of the ship 10 can be stabilized.

As described in detail above, the ship 10
Includes the propulsion device 14 having two propeller devices 26A and 26B, the propulsion power is improved as compared with a ship having only one propeller device. Also, for example,
Even if one of the propeller devices 26A fails,
If the other propeller device 26B is normal, the propeller device 26B alone can navigate, and thus the redundancy of the propulsion device 14 is ensured. Further, since there is only one strut 24 for each of the two propeller devices 26A and 26B, the propulsion is greater than that of a conventional ship (see FIG. 6) in which two propeller devices are attached using two struts. The number of rotating devices for turning the vessel can be reduced, and the shape of the hull can be simplified.

Next, another mode of the propulsion device 14 will be described.

As shown in FIG. 4, the propulsion unit 14A has the same structure as the above-mentioned propeller units 26A and 26B.
It is equipped with two propeller devices 26C, 26D and 26E. Like the propulsion device 14, the propulsion device 14A is attached to the hull 12 via one strut 40. A housing 36C of the propeller device 26C is connected to a lower portion of the strut 40, and the housing 36C of the propeller device 26C, the housing 36D of the propeller device 26D, and the housing 36E of the propeller device 26E are cross-section Y. They are connected by a character-shaped connecting member 42. In this way, the propulsion device 1
Since 4A is attached to the hull 12 via one strut 40, the work steps for attachment can be reduced as in the case of the propulsion device 14 shown in FIGS. 2 and 3.

Propeller device 26C, propeller device 26D
And each propeller 30C, 30D of the propeller device 26D,
Let the virtual axes that are the rotation centers of 30E be the rotation center axis β3, the rotation center axis β4, and the rotation center axis β5, respectively.
The rotation center axes β3, β4 and β5 of the book are parallel to each other and perpendicular to the rear normal α. Further, the rotation center axis β4 and the rotation center axis β5 are located below the rotation center axis β3, and are located in the same plane orthogonal to the rear perpendicular α.

Further, the propeller device 26C includes the propeller 3
The propeller device 26D and the propeller device 26E are the above-mentioned tractor type propeller devices, which are propelling devices of the so-called pushing type, in which the propeller wake is ejected to the side opposite to the strut 40 by the rotation of 0C to obtain a propulsive force. is there. Therefore, the propeller 30C of the propeller device 26C, the propeller device 26D, and the propeller device 2
The propeller 30D and the propeller 30E of 6E are the housings 36C, 36D, and 36 with respect to the strut 40.
Since they are attached to the opposite side of E, they rotate without making contact with each other. As described above, since the propulsion device 14A includes the pushing type propeller device 26C and the tractor type propeller devices 26D and 26E, the pushing type propeller device 26C and the tractor type propeller devices 26D and 26E should be brought close to each other. You can Thereby, it is possible to reduce the size of the propulsion unit 14A.

That is, the distance D2 between the rotation center axis β3 of the propeller 30C of the propeller device 26C and the rotation center axis β4 of the propeller 30D of the propeller device 26D, the radius R _C of the orbit circle 38C at the tip of the propeller 30C, and the propeller 30.
It is possible to make the length shorter than the sum of the radius R _D of the orbital circle 38D at the D tip and the radius R _D. Similarly, the propeller device 26
Distance D3 between the rotation center axis β3 of the C propeller 30C and the rotation center axis β5 of the propeller 30E of the propeller device 26E.
Is the radius R _C of the orbit circle 38C at the tip of the propeller 30C,
It is possible to make it shorter than the sum of the radius R _E of the orbit circle 38E at the tip of the propeller 30E. in this way,
Compared to the case where the tractor type propeller devices are arranged side by side and the pushing type propeller devices are arranged side by side, the rotation center axes of the propellers can be made closer to each other.

Further, since the propulsion unit 14A includes three propeller units 26C, 26D and 26E, it is possible to generate a propulsive force about three times as large as that of the propeller unit having only one propeller unit. . Further, for example, even if the two propeller devices 26D and 26E are out of order, if the remaining one propeller device 26C is normal, the propeller device 2
Since it is possible to navigate only by 6C, the redundancy of the propulsion unit 14A is secured. In addition, the strut 40 is one for the three propeller devices 26C, 26D, and 26E.
Therefore, as compared with the case where a plurality of struts are used, it is possible to reduce the number of rotating devices that rotate the propulsion device and to simplify the shape of the hull.

Further, another aspect of the propulsion device 14 will be described.

As shown in FIG. 5, the propulsion unit 14B has the same structure as the above-mentioned propeller units 26A to 26E.
It is equipped with two propeller devices 26F, 26G, 26H and 26I. These propeller devices 26F, 26G, 26
H and 26I are the hull 12 through one strut 40.
The tractor type propeller device is attached to each.

Propeller device 26F, propeller device 26G
The positional relationship between the propeller device 26H and the propeller device 26H is the same as the propeller device 26C, the propeller device 26D, and the propeller device 2 described above.
This is the same as the positional relationship of 6E. The rotation center axis β6 of the propeller 30F of the propeller device 26F of the propulsion device 14B corresponds to the rotation center axis β3, and the rotation center axes β7 and β8 of the propellers 30G and 30H of the propeller device 26G and the propeller device 26H are It corresponds to the rotation center axis β4 and the rotation center axis β5. Then, below the propeller device 26F along the rear perpendicular α, the rotation center axes β6 and β
A propeller device 26I having a rotation center axis β9 that is parallel to 7 and β8 is connected to the propeller device 26G and the propeller device 26H via a second connecting member 44 having a Y-shaped cross section. In this way, the propulsion unit 14B is attached to the hull 12 via the single strut 40,
The propulsion device 14 shown in FIGS. 2 and 3 and the propulsion device 1 shown in FIG.
As with 4B, the work steps for mounting can be reduced.

As described above, the propulsion unit 14B has four
Since the propeller devices 26F, 26G, 26H, and 26I of the aircraft are provided, it is possible to generate a propulsive force about four times that of the conventional propulsion device having only one propeller device. Also, for example, three propeller devices 26F, 26G, 26
Even if H fails, if the remaining one propeller device 26I is normal, the propeller device 26I alone can navigate, and thus the redundancy of the propulsion device 14B is ensured. Furthermore, four propeller devices 26F, 26
Since there is one strut 40 for G, 26H, and 26I, it is possible to reduce the number of rotating devices that rotate the propulsion device and to simplify the shape of the hull, as compared with the case of using a plurality of struts. Can be

The present invention is not limited to the above embodiment, but various modifications can be made. For example, the number of propeller devices can be appropriately increased or decreased, and may be four or more. In this case, in order to stabilize the propulsion direction of the ship, the rotation axis of the strut (rear perpendicular) is the axis of symmetry,
It is preferable to mount the propeller device so that the starboard and port are symmetrical.

[0034]

According to the present invention, the propulsion force is improved and the redundancy of the propulsion device is ensured while suppressing the increase of the work process and the number of parts at the time of mounting and the complexity of the hull shape. A ship propulsion device and a ship are provided.

[Brief description of drawings]

FIG. 1 is a right side view showing a ship equipped with a propulsion device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the propulsion device shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a view showing another aspect of the propulsion device.

FIG. 5 is a view showing another mode of the propulsion device.

FIG. 6 is a view showing a conventional propulsion device and a ship equipped with the same.

[Explanation of symbols]

10, 50 ... Vessel, 12 ... Hull, 54, 14, 14A,
14B, 52 ... Propulsion device, 20 ... Stern part, 22 ... Mounting part,
24, 40 ... Struts, 26A-26I ... Propeller device, 28, 56 ... Rotating device, 30A-30I ... Propeller, 34A, 34B ... Motor, 36A-36I ... Housing.

Claims (5)

[Claims] 1. A strut and a plurality of propeller devices, each of the propeller devices having a propeller, a motor for driving the propeller, and a housing for accommodating the motor. The propeller for a marine vessel, wherein the propellers of the propeller device have rotational center axes deviated from each other. 2. The marine vessel propulsion device according to claim 1, wherein the plurality of propeller devices include a pushing type propeller device and a tractor type propeller device. 3. The two propeller devices are provided, and the propellers of the propeller devices rotate in opposite directions.
Or the marine vessel propulsion device according to 2. 4. A marine vessel equipped with the marine vessel propulsion device according to claim 1. 5. The marine vessel according to claim 4, wherein the marine vessel propulsion device is mounted so as to be capable of turning within a predetermined angle range about the axis of the strut.