JPH09150794A - Stern structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the length of an extension shaft by supporting the extension shaft of a propeller shaft rearward of a propeller immediately behind the propeller, facilitate the attaching/detaching work of the propeller, and prevent the vibration to cope with the increase in the horsepower. SOLUTION: A propeller shaft 3 is provided with an extension shaft 11 which is extended rearward of a screw propeller 2, and a rear end part of a rear bearing 10 to support the extension shaft 11 is fixed to a forward end part of a supporting member 12 projected forward of a rudder horn 8. The supporting member 12 is fitted to the rudder horn 8 by bolts 13 in an attachable/detachable manner, and the supporting member 12 and the rear bearing 10 are removed from the rudder horn 8 in an integrated manner to simplify the removing work of the screw propeller 2. Because the supporting member 12 is projected forward, the length of the extension shaft 11 can be reduced, and the supporting strength can be increased by the inclined shape of an upper edge 12a and a lower edge 12b of the supporting member 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stern structure in which a supporting means for a screw propeller in a stern is comprehensively improved together with a rudder arrangement configuration.

[0002]

2. Description of the Related Art In a conventional ship, as shown in FIG. 5, a propeller shaft 3 rotatably driven by a main engine (not shown) installed inside a hull 1 is supported by a stern tube bearing 4.
A screw propeller 2 is installed at the rear end of the propeller shaft 3. Then, behind the screw propeller 2, the rudder 5
Are arranged. Note that reference numeral 6 in FIG. 5 indicates a rudder axle, and 7 indicates a water surface.

[0003]

By the way, in the conventional stern structure as described above, when the ship becomes large and has a large horsepower, and the screw propeller 2 becomes large and heavy, the self-weight and the generated thrust of the propeller 2 are generated. There is a problem in the durability of the stern tube bearing 4 because vibration is generated due to the unbalance of the torque and the bending moment acting on the stern tube bearing 4 is excessive. Then, JP-A-61-891
As disclosed in Japanese Patent Publication No. 97, it is considered that the rearward extension shaft of the propeller shaft is supported by a bearing provided on the stern rudder horn. However, in this case, the extension shaft becomes remarkably long, and the propeller is detachable. There is a problem in that it causes problems.

The present invention is intended to solve such a problem, and allows the extension shaft of the propeller shaft to the rear of the propeller to be supported immediately after the propeller, thereby shortening the extension shaft and thereby propeller. It is an object of the present invention to provide a stern structure that enables easy attachment / detachment work of the vehicle and prevents vibrations and can cope with an increase in horsepower.

[0005]

In order to achieve the above-mentioned object, the stern structure of the present invention is provided with a screw propeller at the rear end of a propeller shaft supported by a stern tube bearing at the stern, and at the same time, the screw propeller. A rudder horn fixedly hung from the stern hull so as to form the upper half of the rudder, and a rudder movable part attached to the rudder horn so as to be turnable. The propeller shaft is provided with an extension shaft extending rearward from the screw propeller, and a rear bearing supporting the extension shaft has a rear end of a support member projecting forward from the rudder horn. It is characterized in that it is supported so as to be fixed to the front end.

In the above stern structure, the extension shaft of the propeller shaft to the rear of the screw propeller is supported by the rear bearing having the rear end fixed to the front end of the support member projecting forward from the ladder horn. The length of the extension shaft is significantly shortened as compared with the conventional case in which the bearing is provided in the rudder horn. Therefore, at the time of maintenance of the screw propeller, the propeller shaft can be slightly retracted to the inside of the ship together with the extension shaft thereof, so that the propeller can be easily removed. Further, since the screw propeller is supported by the stern tube bearing and the rear bearing via the propeller shaft and its extension shaft before and after the screw propeller, the occurrence of vibration is prevented, and it becomes possible to cope with the increase in horsepower.

In the stern structure of the present invention, the support member is detachably attached to the rudder horn via bolts so that the support member can be removed from the rudder horn while being integral with the rear bearing. Is characterized by. Thus, if the support member of the rear bearing that supports the extension shaft of the propeller shaft can be removed together with the rear bearing, the work of removing the screw propeller can be performed more easily.

Further, in the stern structure of the present invention, the upper edge of the support member is formed to be inclined so as to gradually rise rearward from the front end thereof, and the lower edge of the support member is
The feature is that it is formed so as to gradually descend from the front end to the rear. Due to the inclined shapes of the upper edge and the lower edge of the support member, the support strength of the extension shaft by the rear bearing when the support member is attached to the ladder horn is significantly increased.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a stern structure as a first embodiment of the present invention, and FIGS.
2 shows a stern structure as an embodiment, FIG. 2 is a side view thereof, FIG. 3 is a side view showing a state in which a part of the member is removed, and FIG. 4 is a side view showing the member removed in FIG. is there.

First, the first embodiment of the present invention will be described. As shown in FIG. 1, a screw propeller 2 is installed at the stern of the hull 1, and the screw propeller 2 is installed inside the hull 1. It is mounted on the rear end of the propeller shaft 3 which is rotationally driven by a main engine (not shown). The propeller shaft 3 is supported by the stern tube bearing 4.

An extension shaft 11 in which the propeller shaft 3 is extended to the rear of the screw propeller 2 is supported by a rear bearing 10 supported by a support member 12 attached to a rudder horn 8. The support member 12 is provided so as to project forward from the rudder horn 8, and the rear end portion of the rear bearing 10 is fixed to the front end portion of the support member 12. And
The upper edge 12a of the support member 12 is formed to be inclined so as to gradually rise rearward from its front end, and the lower edge of the support member 12 is formed.
12b is formed to be inclined so as to gradually descend rearward from its front end. The rudder 5 provided at the rear of the screw propeller 2 is composed of a rudder horn 8 fixedly suspended from the hull 1 at the stern and a rudder movable part 9 rotatably supported with respect to the rudder horn 8. The steering operation of the movable rudder 9 is performed by a steering device (not shown) via the rudder shaft 6. In addition, the code | symbol 7 shows a water surface.

In the above stern structure, the extension shaft 11 of the propeller shaft 3 rearward of the screw propeller 2 is fixed to the front end of the support member 12 projecting forward from the rudder horn 8 at the rear end. Since it is supported by the rear bearing 10, the same extension shaft
The length of 11 is significantly shortened as compared with the conventional case in which the bearing is provided inside the ladder horn 8. Therefore, when removing the screw propeller 2,
The propeller shaft 3 and the extension shaft 11 thereof can be slightly retracted to the inside of the ship so that the screw propeller 2 can be easily removed.

Since the screw propeller 2 is supported by the stern tube bearing 4 and the rear bearing 10 through the propeller shaft 3 and the extension shaft 11 before and after the screw propeller 2, the generation of vibration is prevented and the horsepower is increased. Will be able to deal with. Further, the inclined shape of the upper edge 12a and the lower edge 12b of the support member 12 makes it possible to remarkably enhance the support strength of the extension shaft 11 by the rear bearing 10 in a state where the support member 12 is attached to the ladder horn 8. .

Next, a stern structure as a second embodiment of the present invention will be described. Also in the case of the present embodiment, as shown in FIG. 2, a screw propeller 2 is provided at the stern of the hull 1, and The screw propeller 2 is attached to a rear end portion of a propeller shaft 3 that is rotationally driven by a main engine (not shown) installed inside the hull 1. The propeller shaft 3 is supported by the stern tube bearing 4.

The support member 12 is provided so as to project forward from the rudder horn 8, and the rear end portion of the rear bearing 10 is fixed to the front end portion of the support member 12, but in the second embodiment. In particular, as shown in FIGS.
It is detachably attached via a bolt 13 to a mounting seat 15 (see FIG. 3) inside the rudder horn 8 so that it can be detached from the rudder horn 8 while being integrated with the rear bearing 10. The other structure of this embodiment is almost the same as that of the first embodiment described above, and the same reference numerals as those in FIG. 1 in FIG. 2 indicate substantially the same members.

With the above-mentioned configuration, in the second embodiment, prior to the work of removing the screw propeller 2,
The support member 12 and the rear bearing 10 shown in FIG. 2 move the propeller shaft 3 together with the extension shaft 11 slightly forward as shown in FIG. 3, and then remove the bolt 13 to show the propeller shaft 3 shown in FIGS. 3 and 4. As it is, it is taken out of the shaft system as it is. 3 and 4, reference numeral 14a indicates a bolt hole, and 14b indicates a female screw hole. In this way, as shown in FIG. 3, a working space for removing the propeller is formed between the screw propeller 2 and the rudder horn 8, so that the work can be performed extremely efficiently and easily. . Other functions and effects of the second embodiment are similar to those of the first embodiment.

[0017]

As described above in detail, according to the stern structure of the present invention, the following effects can be obtained. (1) Since the extension shaft of the propeller shaft to the rear of the screw propeller is supported by the rear bearing whose rear end is fixed to the front end of the support member protruding forward from the ladder horn, the length of the extension shaft is increased. The length can be significantly reduced as compared with the conventional case. (2) According to the above item (1), at the time of maintenance of the screw propeller, the propeller shaft together with its extension shaft can be slightly retracted toward the inside of the ship, so that the screw propeller can be easily removed. (3) Before and after the screw propeller,
Since it is supported by the stern tube bearing and the rear bearing via the propeller shaft and its extension shaft, the occurrence of vibration is prevented and it becomes possible to cope with the increase in horsepower. (4) If the support member of the rear bearing that supports the extension shaft of the propeller shaft can be removed as it is together with the rear bearing, the work of removing the screw propeller can be performed more easily. (5) Due to the inclined shape of the upper edge and the lower edge of the support member, the support strength of the extension shaft by the rear bearing with the support member attached to the ladder horn is significantly increased.

[Brief description of the drawings]

FIG. 1 is a side view showing a stern structure as a first embodiment of the present invention.

FIG. 2 is a side view showing a stern structure as a second embodiment of the present invention.

FIG. 3 is a side view showing a state in which some members are removed from the stern structure in FIG.

FIG. 4 is a side view showing the member removed in FIG.

FIG. 5 is a side view showing a conventional stern structure.

[Explanation of symbols]

 1 Hull 2 Screw propeller 3 Propeller shaft 4 Stern tube bearing 5 Rudder 6 Rudder shaft 7 Water surface 8 Rudder horn 9 Rudder moving part 10 Rear bearing 11 Extension shaft 12 Support member 12a Support member upper edge 12b Support member lower edge 13 Bolt 14a Bolt hole 14b Female screw hole 15 Mounting seat

Claims (3)

[Claims] 1. At the stern, a screw propeller is provided at the rear end of a propeller shaft supported by a stern tube bearing, and a rudder is provided at the rear of the screw propeller,
The rudder is composed of a rudder horn fixedly hung from the stern hull so as to form the upper half of the rudder, and a rudder movable part rotatably attached to the rudder horn. An extension shaft extending rearward from the screw propeller is provided, and a rear bearing supporting the extension shaft is fixed to a front end portion of a support member projecting its rear end portion forward from the ladder horn. The stern structure is characterized by being supported by. 2. The stern structure according to claim 1, wherein the support member is detachably attached to the rudder horn via bolts so that the support member can be removed from the rudder horn while being integral with the rear bearing. The stern structure, which is characterized by 3. The stern structure according to claim 1, wherein an upper edge of the support member is formed to be inclined so as to gradually rise rearward from a front end thereof, and a lower edge of the support member. However, the stern structure is characterized in that it is formed so as to gradually descend rearward from its front end.