JP6449054B2 - Removal method of ship and propeller shaft - Google Patents

Description

  The present invention relates to a ship and a method for removing a propeller shaft in the ship.

  Conventionally, an engine room in which a main engine for rotating a propeller for propulsion of a ship is arranged is provided on the stern side of the ship. The propeller is attached to the rear end of the propeller shaft, and is connected to the main engine via a propeller shaft and an intermediate shaft that extend in the front-rear direction of the hull. For example, in the ship described in Patent Document 1, the propeller shaft and the intermediate shaft are connected by an integral flange.

JP 2012-210888 A

  Here, when carrying out the propeller shaft outside the ship, after disconnecting the connection between the propeller shaft and the intermediate shaft, the propeller shaft with the propeller removed is pulled into the engine room and then transferred to the outer plate on the engine room side. The method of discharging out of the ship through the opening is used. However, in order to discharge the propeller shaft into the engine room and then discharge it out of the ship, the length of the engine room in the longitudinal direction of the hull needs to be longer than the length of the propeller shaft, making it difficult to reduce the size of the engine room. It was.

  The present invention has been made in view of the above, and an object of the present invention is to provide a ship capable of reducing the size of an engine room and a method for removing a propeller shaft in the ship.

  In order to achieve the above object, a ship according to an embodiment of the present invention is connected to a main engine disposed in an engine room, penetrates from the engine room toward the outside of the ship, and a propeller is attached to the rear. A propeller shaft and a stern tube provided around the propeller shaft, the propeller shaft being disposed coaxially with the first shaft and behind the first shaft with the first shaft. And a connecting means for connecting the first shaft and the second shaft within the stern tube.

  According to the ship described above, the propeller shaft is constituted by the first shaft and the second shaft, so that the length in the front-rear direction of the engine room required for drawing the propeller shaft into the engine room is shortened. can do.

  Further, a method for removing a propeller shaft in a ship according to an aspect of the present invention is connected to a main engine disposed in an engine room, penetrates from the engine room toward the outside of the ship, and the propeller is attached to the rear. And a stern tube provided around the propeller shaft, the propeller shaft being disposed coaxially with the first shaft and behind the first shaft with the first shaft A propeller shaft removal method for a ship, comprising: a second shaft to be connected; and a connecting means for connecting the first shaft and the second shaft within the stern tube, wherein the first shaft And removing the connecting means for connecting the first shaft drawn out into the engine chamber and the second shaft, and the first shaft and the second shaft. And the connecting means is removed. It characterized in that it and a step of pulling out said second axis to said engine chamber which.

  According to the above-described method for removing the propeller shaft, the first shaft portion of the propeller shaft is drawn into the engine chamber, the connecting means is removed, and the first shaft and the second shaft are separated. The second shaft is drawn into the engine room. Therefore, even if the length of the engine room in the front-rear direction is shorter than the length of the propeller shaft, the propeller shaft can be drawn into the engine room, and the engine room can be downsized.

  Here, the connection means may be a cylindrical coupling.

  When a cylindrical coupling is used as the connecting means, the inner diameter of the stern tube can be reduced as compared with other connecting means. Therefore, the method of taking out the propeller shaft can be applied to a ship having a stern structure including a stern tube equivalent to the conventional one.

  ADVANTAGE OF THE INVENTION According to this invention, the ship in which the engine room can be reduced in size and the removal method of the propeller shaft in this ship are provided.

It is a schematic side view which shows the ship which concerns on one Embodiment of this invention. It is a side view which shows the stern part of the ship of FIG. It is a side view explaining the removal method of the propeller shaft in the ship of FIG. It is a top view explaining the removal method of the propeller shaft in the ship of FIG. It is a side view which shows the stern part of the conventional ship. It is a top view explaining the removal method of the propeller shaft in the conventional ship.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the terms “front”, “rear”, “left”, “right”, “upper”, and “lower” correspond to the front-rear direction, the left-right (width) direction, and the vertical direction of the hull. Moreover, in FIGS. 1-6, the plate | board thickness of each member is abbreviate | omitted for convenience.

  FIG. 1 is a schematic side view showing a ship according to an embodiment of the present invention, and FIG. 2 is a side view showing a stern part of the ship shown in FIG. As shown in FIGS. 1 and 2, the ship 1 of the present embodiment is an enlarged ship such as a tanker, and includes a propulsion shaft system 2, a rudder 3, and an engine room 12.

  The engine room 12 is located in the lower rear part of the ship 1, and the main engine 21 is arrange | positioned. The side wall of the engine room 12 is constituted by a hull outer plate. A stern structure 30 (hull structure) in which the stern tube 25 of the propulsion shaft system 2 is accommodated is formed on the rear side of the engine room 12.

  The propulsion shaft system 2 is for generating a propulsive force of the ship 1, and includes an intermediate shaft 22, an intermediate bearing 23, a front seal device 24, a stern tube 25, a stern tube bearing 25a, a propeller shaft 26, and a rear seal device. 27 and a propeller 28 are provided. A rudder 3 is disposed behind the propulsion shaft system 2 so as to face the propulsion shaft system 2 in order to control the propulsion direction of the ship 1.

  The intermediate shaft 22 extends along the front-rear direction, and the front end thereof is connected to the main engine 21. The intermediate shaft 22 is rotatably supported by the hull via the intermediate bearing 23 on the intermediate bearing stand 23a. Further, the intermediate shaft 22 has a flange 22a formed at the rear end thereof, and is connected to the propeller shaft 26 as an integral flange.

  The propeller shaft 26 extends along the front-rear direction and is provided at the rear end portion of the intermediate shaft 22. The propeller shaft 26 includes a first shaft 261 and a second shaft 262 that are arranged on the same axis. The first shaft 261 is formed with a flange 26 a at the front end, and constitutes an integral flange together with the flange 22 a at the rear end of the intermediate shaft 22. The second shaft 262 is disposed coaxially with the first shaft 261 at the rear end portion of the first shaft 261. The first shaft 261 and the second shaft 262 are connected via the connecting means 40. Thereby, the first shaft 261 and the second shaft 262 function as the propeller shaft 26. The connecting means between the propeller shaft 26 (first shaft 261) and the intermediate shaft 22 is not limited to the integral flange, and various connecting means can be used.

  The propeller 28 is connected to the rear end portion of the second shaft 262 of the propeller shaft 26. The propeller 28 is rotated as the intermediate shaft 22 and the propeller shaft 26 rotate.

  A stern tube 25 is provided around the propeller shaft 26 penetrating through the stern structure 30, and the propeller shaft 26 is rotatably supported on the hull via a stern tube bearing 25a. Lubricating oil O <b> 1 is accommodated in the stern tube 25. The stern structure 30 may include a cooling means for cooling the lubricating oil O1.

  A front side seal device 24 is provided on the front side of the stern tube 25 to prevent leakage of the lubricating oil O1 in the stern tube 25 to the engine room 12 side. A rear seal device 27 is provided on the rear side of the stern tube 25 to prevent leakage of the lubricating oil O1 in the stern tube 25 to the outside of the ship (seawater side).

  The first shaft 261 and the second shaft 262 of the propeller shaft 26 are connected by the connecting means 40 inside the stern tube 25. The connecting means 40 is provided on the outer periphery of the first shaft 261 and the second shaft 262, but it is preferable that the thickness of the portion provided outside the first shaft 261 and the second shaft 262 is thin. That is, that is, it is preferable that the outer diameter of the connecting means 40 that covers the outer sides of the first shaft 261 and the second shaft 262 is small. Examples of such connecting means 40 include shaft couplings that can connect two concentric shafts, such as a friction cylindrical shaft coupling and a seller conical shaft coupling, and include parts that protrude outward. You can use those that are not. Such a connecting means 40 is referred to as “tubular coupling” in the present embodiment.

  Since the inner diameter of the stern tube 25 is determined according to the outer diameter of the connecting means 40, the propeller shaft has a smaller difference between the outer diameter of the connecting means 40 and the outer diameters of the first shaft 261 and the second shaft 262. The stern tube 25 corresponding to the size of the stern tube 26 can be provided, and the stern structure can be configured without increasing the stern aggregate around the stern tube 25. Specifically, the outer diameter of the connecting means 40 is preferably about 1.5 to 1.6 times or smaller than the outer diameters of the first shaft 261 and the second shaft 262.

  The connecting means 40 is arranged at a position that does not overlap the stern tube bearing 25a in the stern tube 25 when the propeller shaft 26 is attached. Specifically, the connecting means 40 is disposed in front of the stern tube bearing 25a.

  The rudder 3 is disposed behind the propeller 28 and includes a rudder shaft 31 that extends downward from the hull of the ship 1 and a rudder plate 32 that is rotatably attached to the lower side of the rudder shaft 31.

  A method for removing the propeller shaft 26 in the ship 1 will be described with reference to FIGS. 3 and 4. The method of removing the propeller shaft 26 includes a step of pulling out the first shaft 261 into the engine chamber 12, and a connecting means 40 for connecting the first shaft 261 pulled out into the engine chamber 12 and the second shaft 262. And removing the first shaft 261 and the second shaft 262, and pulling out the second shaft 262 from which the connecting means 40 has been removed into the engine room 12. Hereinafter, these operations will be described.

  First, when the propeller shaft 26 is removed from the stern tube 25 in the ship 1 for some reason, the propeller 28 is removed from the propeller shaft 26. Further, the intermediate shaft 22 connected to the first shaft 261 of the propeller shaft 26 is removed, and the intermediate bearing 23 is also removed.

  Next, as shown in FIG. 3, the propeller shaft 26 is pulled into the engine room 12 with the first shaft 261 and the second shaft 262 being connected. At this time, the propeller shaft 26 is moved until the connecting means 40 that connects the first shaft 261 and the second shaft 262 is completely drawn into the engine room 12.

  Next, the connection by the connecting means 40 is released, and the first shaft 261 in the engine room 12 and the second shaft 262 remaining in the stern tube 25 are separated. Thereafter, as shown in FIG. 4, the second shaft 262 of the propeller shaft 26 is drawn into the engine room 12. Thereby, the propeller shaft 26 can be removed from the stern tube 25. When the propeller shaft 26 needs to be carried out of the ship, the first shaft 261 and the second shaft 262 can be individually carried out of the ship. For example, when removing the propeller shaft 26 in order to check the inside of the stern tube 25 and the stern tube bearing 25a, the first shaft 261 and the second shaft 262 are pulled into the engine room 12. The stern tube 25 and the stern tube bearing 25a can be inspected.

  In addition, when attaching the propeller shaft 26 once removed, the propeller shaft 26 can be attached in the reverse order described above. That is, after a part of the second shaft 262 is inserted into the stern tube 25, the first shaft 261 and the second shaft 262 are connected by the connecting means 40. Thereafter, the propeller shaft 26 is inserted from the engine chamber 12 side so that the first shaft 261 and the second shaft 262 are in predetermined positions. Thereafter, the intermediate shaft 22 in the engine room 12 and the first shaft 261 are connected by an integral flange, and after the propeller shaft 26 is attached at a predetermined position, the propeller 28 can be attached to the propeller shaft 26. .

  The ship 1 according to the present embodiment has the above-described structure, so that the engine room 12 can be downsized. This point will be described in comparison with the conventional ship shown in FIGS.

  As shown in FIG. 5, in the conventional ship 1A, the propeller shaft 26 and the intermediate shaft 22 are connected by integral flanges 22a and 26a, and the propeller shaft 26 is like the ship 1 according to the present embodiment. The two shafts were not connected. In this case, the outer diameter of the integral flange 26 a is larger than the inner diameter of the stern tube 25. Therefore, in order to carry the propeller shaft 26 out of the ship, as shown in FIG. 6, after the propeller shaft 26 that has been disconnected from the intermediate shaft 22 is drawn into the engine room 12, the propeller shaft 26 is rotated. Then, it was carried out of the ship through the opening 15 formed on the side surface of the hull (left side surface in FIG. 6).

  Here, in order to rotate the propeller shaft 26 after being drawn into the engine room 12, the distance L2 between the rear end of the main engine 21 and the stern structure 30 in the engine room 12 is larger than the length of the propeller shaft 26. There was a need to do. When the ship 1 is a tanker that transports oil or the like, it is desirable to shorten the length of the engine room 12 in the front-rear direction in order to shorten the total length of the ship while maintaining a certain capacity. However, in the case of the conventional ship 1A, it is affected by the length of the propeller shaft 26. Since it is difficult to shorten the propeller shaft 26 itself because of the stern structure of the conventional ship 1A, the distance between the rear end of the main engine 21 and the stern structure 30 determined according to the length of the propeller shaft 26 is difficult. It is difficult to shorten the distance L2. Therefore, it has been difficult to shorten the length of the engine room 12 in the front-rear direction.

  On the other hand, in the marine vessel 1 according to the present embodiment, the propeller shaft 26 includes the first shaft 261 and the second shaft 262, which is necessary for drawing the propeller shaft 26 into the engine room. The length of the engine room 12 in the front-rear direction can be shortened. Specifically, as shown in FIG. 2, in the ship 1, the distance L <b> 1 between the rear end of the main engine 21 and the stern structure 30 in the engine room 12 can be made shorter than the conventional ship 1 </ b> A. The engine room 12 can be downsized. In the ship 1, the length of the intermediate shaft 22 is shorter than that of the intermediate shaft 22 in the conventional ship 1A.

  According to the method of removing the propeller shaft 26 from the boat 1 according to the present embodiment, the first shaft 261 of the propeller shaft 26 is drawn into the engine room 12, the connecting means 40 is removed, and the first shaft 261 is removed. And the second shaft 262 are separated, and then the second shaft 262 is drawn into the engine chamber 12 so that the length of the engine chamber 12 in the front-rear direction is shorter than the length of the propeller shaft 26. In addition, the propeller shaft 26 can be pulled into the engine room 12.

  Further, when a cylindrical coupling is used as the connecting means 40, the inner diameter of the stern tube 25 can be reduced, so that the stern structure can be configured without increasing the stern aggregate around the stern tube 25. Can do. Therefore, the method of taking out the propeller shaft can be applied to a ship having a stern structure including a stern tube equivalent to the conventional one.

  The present invention has been described in detail based on the embodiments. However, application of the present invention is not limited to the above embodiment. That is, the present invention can be variously modified without departing from the gist thereof.

  For example, the shapes of the boat 1 such as the rudder 3 and the stern structure 30 can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Ship, 3 ... Rudder, 12 ... Engine room, 21 ... Main engine, 22 ... Intermediate shaft, 23 ... Intermediate bearing, 25 ... Stern tube, 26 ... Propeller shaft, 28 ... Propeller, 32 ... Rudder plate, 40 ... Connection means.

Claims (3)

A propeller shaft connected to the main engine disposed in the engine room, penetrating from the engine room toward the outside of the ship, and a propeller attached to the rear;
A stern tube provided around the propeller shaft;
With
The propeller shaft is
A first axis;
A second axis disposed coaxially with the first axis behind the first axis;
Connecting means for connecting the first shaft and the second shaft in the stern tube;
I have a,
The ship characterized in that an inner diameter of the stern tube on the engine room side than a position where the connecting means is provided is larger than an outer diameter of the connecting means .
To ship.   The ship according to claim 1, wherein the connecting means is a cylindrical coupling. A propeller shaft connected to a main engine disposed in the engine room, penetrating from the engine room toward the outside of the ship and having a propeller attached to the rear, and a stern tube provided around the propeller shaft; The propeller shaft includes a first shaft, a second shaft disposed behind the first shaft and coaxially with the first shaft, the first shaft, and the second shaft. A connecting means for connecting the shaft in the stern tube, and a method for removing the propeller shaft in the ship,
Withdrawing the first shaft into the engine room in a state where the first shaft and the second shaft are connected by the connecting means ;
Removing the connecting means for connecting the first shaft drawn out into the engine room and the second shaft, and separating the first shaft and the second shaft;
Pulling out the second shaft, from which the connecting means has been removed, into the engine room.

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