JP3322546B2 - Stern structure - Google Patents

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 support means for a screw propeller at the stern is improved in general with the arrangement of the rudder.

[0002]

2. Description of the Related Art In a conventional marine vessel, as shown in FIG. 5, a propeller shaft 3 rotationally driven by a main engine (not shown) installed inside a hull 1 is supported by a stern tube bearing 4, and
A screw propeller 2 is provided at the rear end of the propeller shaft 3. Then, the rudder 5 behind the screw propeller 2
Are arranged. In addition, the code | symbol 6 in FIG. 5 has shown the rudder shaft, and 7 has shown the water surface.

[0003]

In the conventional stern structure as described above, when the ship is large and has a large horsepower and the screw propeller 2 becomes large and heavy, the propeller 2 has its own weight and generated thrust. As a result, vibration is generated due to the imbalance between the torque and the torque, and the bending moment acting on the stern tube bearing 4 becomes excessive. Therefore, Japanese Patent Application Laid-Open No. 61-891
No. 97, it is conceivable to support the extension shaft rearward of the propeller shaft with a bearing provided on the rudder horn on the stern. Is a problem.

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and an extension shaft of a propeller shaft extending rearward of the propeller can be supported immediately after the propeller, thereby shortening the extension shaft. It is an object of the present invention to provide a stern structure capable of easily performing attachment / detachment work, preventing vibration, and coping with large horsepower.

[0005]

In order to achieve the above-mentioned object, the stern structure of the present invention comprises a stern having a screw propeller at the rear end of a propeller shaft supported by a stern tube bearing, and A rudder horn fixedly suspended from the stern hull so that the rudder forms the front half of the rudder, and a rudder movable part rotatably mounted on the rudder horn. The propeller shaft has an extension shaft extending rearward from the screw propeller, and a rear bearing supporting the extension shaft has a rear end portion of a support member projecting forward from the rudder horn. It is supported so as to be fixed to the front end, and the support member is integrated with the rear bearing.
The ladder horn can be removed from the ladder horn.
The above-mentioned support member is detachably attached to the
It is characterized in that there was an eclipse.

In the above-mentioned stern structure, 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 projecting forward from the rudder horn. The length of the extension shaft is greatly reduced 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 retracted slightly together with the extension shaft into the ship interior, so that the propeller can be easily removed. Then, 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 generation of vibration is prevented, and it is possible to cope with a large horsepower.

[0007] The support member of the rear bearing for supporting the extension axis of the propeller shaft, since so removable remain rear bearing integral, Removing the screw propeller is to be performed more easily.

Further, in the stern structure of the present invention, the upper edge of the support member is formed so as to be inclined upward gradually from the front end thereof, and the lower edge of the support member is
It is characterized by being formed so as to gradually descend from the front end to the rear. 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 in a state where the support member is attached to the rudder horn can be significantly increased.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the embodiments of the present invention will be described with reference to the drawings, schematic ship tail structure of Figure 1 the invention
Side view showing, the more the main part of the stern construction of 2-4 1
Shows in thin, 2 is a side view, FIG. 3 is a side view showing a state in which remove the part of the member, FIG 4 is a side view showing a member that has been removed in FIG. 3.

As shown in FIG . 1, a stern of a hull 1 is provided with a screw propeller 2, and the screw propeller 2 is provided with a propeller shaft 3 that is rotationally driven by a main engine (not shown) installed inside the hull 1. It is attached to the rear end. The propeller shaft 3 is supported by a stern tube bearing 4.

An extension shaft 11 having the propeller shaft 3 extended to the rear of the screw propeller 2 is supported by a rear bearing 10 supported by a support member 12 attached to the rudder horn 8. The support member 12 is provided so as to protrude forward from the rudder horn 8, and the rear end of the rear bearing 10 is fixed to the front end 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 the front end thereof, and the lower edge of the support member 12 is formed.
12b is formed to be inclined so as to gradually descend from its front end to the rear.

The rudder 5 provided behind the screw propeller 2 includes a rudder horn 8 fixedly suspended from the hull 1 at the stern and a rudder movable portion 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. Reference numeral 7 indicates a water surface.

[0013] In a further in this embodiment, as shown in FIG. 2 to 4, the support member 12 is, as removed from the rear bearing 10 and the left rudder horn 8 of the integral, internal mounting seat 15 of the rudder horn 8 (FIG. 3 ) Is removably attached via a bolt 13.

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

The screw propeller 2 is supported by the stern tube bearing 4 and the rear bearing 10 via the propeller shaft 3 and the extension shaft 11 before and after the screw propeller 2, so that the generation of vibration is prevented and the horsepower is increased. Will be able to respond. Further, the inclined shape of the upper edge 12a and the lower edge 12b of the support member 12 makes it possible to remarkably increase 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 rudder horn 8. .

Further , in this embodiment, prior to the work of removing the screw propeller 2, the support member shown in FIG.
12 and the rear bearing 10 first move the propeller shaft 3 slightly forward together with the extension shaft 11 as shown in FIG. 3, and then remove the bolt 13 so that the propeller shaft 3 remains integral as shown in FIGS. It is taken out of the system. In addition,
3 and 4, reference numeral 14a indicates a bolt hole, and reference numeral 14b indicates a female screw hole. In this way, as shown in FIG. 3, a work space for propeller removal work is formed between the screw propeller 2 and the rudder horn 8, so that the work can be performed extremely efficiently and conveniently. .

[0017]

As described above, according to the stern structure of the present invention, the following effects can be obtained. (1) The extension shaft of the propeller shaft to the rear of the screw propeller is supported by a rear bearing whose rear end is fixed to the front end of a support member protruding forward from the rudder horn. Can be greatly reduced as compared with the conventional case. (2) According to the above item (1), at the time of maintenance of the screw propeller, the screw propeller can be easily removed with the extension shaft being retracted a little into the ship interior. (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 is possible to cope with an increase in horsepower. (4) support the rear bearing for supporting the extension axis of the propeller shaft, since so removable remain rear bearing integral, Removing the screw propeller is to be performed more easily. (5) 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 in a state where the support member is attached to the rudder horn can be significantly increased.

[Brief description of the drawings]

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

FIG. 2 is a side view showing a main part of the stern structure of FIG . 1 in detail .

FIG. 3 is a side view showing a state in which some members in the stern structure of FIG. 2 are removed.

FIG. 4 is a side view showing the member removed in FIG. 3;

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

[Explanation of symbols]

 DESCRIPTION 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 movable part 10 Rear bearing 11 Extension shaft 12 Support member 12a Upper edge of support member 12b Lower edge of support member 13 Bolt 14a Bolt hole 14b Female screw hole 15 Mounting seat

Claims (2)

(57) [Claims] At the stern, a screw propeller is provided at a 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 suspended from the stern hull so as to form the upper half of the rudder, and a rudder movable part rotatably mounted on the rudder horn. A rear bearing supporting the extended shaft is provided with an extended shaft extending rearward from the screw propeller, and a rear end of the extended bearing is fixed to a front end of a support member projecting forward from the rudder horn. It is supported Te
And the support member is integrated with the rear bearing.
Up on the ladder horn so that it can be removed from the horn
The stern structure, wherein the support member is detachably attached via a bolt . 2. 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 is A stern structure characterized by being formed so as to gradually descend from its front end to the rear.