KR20150115040A

KR20150115040A - Propulsion shafting bearing apparatus for ship

Info

Publication number: KR20150115040A
Application number: KR1020140039148A
Authority: KR
Inventors: 김기선
Original assignee: 현대중공업 주식회사
Priority date: 2014-04-02
Filing date: 2014-04-02
Publication date: 2015-10-14

Abstract

According to an embodiment of the present invention, a propulsion shafting bearing apparatus for a ship comprises: a first and a second bush provided on a propeller shaft of a ship; a mobile bearing capable of being moved between the first and second bushes; and a stern tube surrounding the first and second bushes and the mobile bearing.

Description

[0001] PROPULSION SHAFTING BEARING APPARATUS FOR SHIP [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a propeller shaft bearing device for a ship, and more particularly, to a propeller shaft bearing device for a ship capable of reducing transverse vibration of a propeller shaft storage calendar through a movable bearing in a stern tube.

Generally, propulsion shaft transverse vibration plays a very important role in supporting the support bearing since the position and rigidity of the bearing supporting the propeller mass and shaft system determine the vibration characteristics.

Since the spring constant and the damping coefficient of the support bearing are determined by the supporting load, it is impossible to ignore the axial arrangement calculation and calculate the lateral vibration.

Therefore, before calculating the transverse vibration, the shaft arrangement should be calculated. If the shaft arrangement is already performed and the optimum shaft arrangement is made, it is necessary to calculate the spring constant or the damping coefficient of the support bearing by using these values.

A prior art related to the present invention is Korean Patent Laid-Open Publication No. 10-2009-0126486 (published on December 09, 2009), which discloses a 'jig for processing a stern tube bush'.

The present invention provides a bearing propulsion shaft bearing device capable of reducing lateral vibration of a propeller shaft storage calendar through a movable bearing in a stern tube.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

The propulsion shaft bearing device for a ship according to an embodiment of the present invention includes: first and second bushes provided on a propeller shaft of a ship; A movable bearing movable between the first and second bushes; And a stern tube surrounding the first and second bushes and the moving bearing.

The moving bearing is provided at an anti-nodal point of the propeller shaft whirling vibration.

The moving bearing is made of any one of a tilting-pad bearing and a journal bearing.

The marine propulsion shaft type bearing device may further include moving means for moving the moving bearing between the first and second bushes.

A guide rail connected between the first and second bushes to guide movement of the movable bearing; A screw shaft for providing a moving path of the movable bearing; And a drive motor for rotating the screw shaft to control movement of the movable bearing.

The moving means may be a hydraulic cylinder.

According to the propulsion shaft bearing device for a ship according to an embodiment of the present invention, lateral vibration of the propeller shaft storage calendar can be effectively reduced through bearings movable in the stern tube according to the resonance mode.

1 is a side view schematically showing a ship equipped with a propulsion device;
2 is a conceptual view schematically showing a propulsion shaft bearing device for a ship according to an embodiment of the present invention.
3 is an operational view of a propulsion shaft bearing device for a ship according to a first embodiment of the present invention.
4 is an operational view of a propulsion shaft bearing device for a ship according to a second embodiment of the present invention.
5 is a cross-sectional view taken along the line A-A 'shown in FIG. 4;
6 is an operational view of a bearing propulsion shaft bearing device according to a third embodiment of the present invention;
7 is a cross-sectional view taken along the line B-B 'shown in Fig. 6;

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: It is intended that the invention be described in its entirety by reference to the appended claims and their equivalents.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a side view schematically showing a ship equipped with a ship propulsion device.

Referring to Fig. 1, the ship propulsion device 10 has a function of transmitting power from the aft part of the ship 1. [

When the ship 1 is operated, the propulsion shaft of the ship propulsion apparatus 10 is provided with torsional vibration, axial vibration and longitudinal vibration, axial-torsional coupled vibration, and lateral vibration vibration may occur.

Of these, the torsional vibration and the lateral vibration are mainly the problems in the small and medium sized ship 1, and in the case of the large-sized line, the longitudinal vibration, the longitudinal vibration and the torsional vibration can be added thereto.

Propeller shaft transverse vibration is a cause of accidents such as propeller shaft, stern tube bearing, stern tube sealing device. Especially, in case of abnormal wear of stern tube bearings and oil lubricated stern tube, accidents such as leakage of oil and damage of seal may occur.

2 is a conceptual view briefly showing a propulsion shaft bearing device for a ship according to an embodiment of the present invention.

2, the ship propulsion apparatus 10 is provided with a main engine 14 for driving the propeller 11, and a plurality of shafts are concentrically disposed between the main engine 14 and the propeller 11 .

The ship propulsion apparatus 10 is configured such that a motor rotation shaft 13, an intermediate connection shaft, and a propeller shaft 12 of the main engine 14 are connected in order.

At this time, a flange (not shown) having a plurality of fastening holes may be formed at the ends of the motor rotation shaft 13, the intermediate connection shaft, and the propeller shaft 12 so as to be mutually fastened. The flanges have the same tolerance to each other and can be bolted together.

The intermediate connection shaft may be provided with a bearing 15 fixedly supported on a bottom surface thereof for lubricating the intermediate connection shaft.

The propulsion shaft bearing device 100 for a ship according to an embodiment of the present invention includes first and second bushes 110 and 120, a moving bearing 140, and a stern tube 140.

The first and second bushes 110 and 120 are provided on the propeller shaft 12 of the ship. The first bushing 110 is connected to an end of a propeller shaft 12 having a propeller 11 mounted on an after bush.

The second bushing 120 is spaced forward from the first bushing 110 by a forward bushing FWD BUSH and is connected to the propeller shaft 120.

The movable bearing 130 is movable between the first and second bushes 110 and 120.

The stern tube 140 has a structure to enclose the first and second bushes 110 and 120 and the moving bearing 130.

3 is an operational diagram of a bearing propulsion shaft bearing device according to a first embodiment of the present invention.

Referring to FIG. 3, the propulsion shaft bearing device 100 for a marine vessel according to the first embodiment of the present invention includes a moving bearing 140 between the first and second bushes 110 and 120 to reduce shaft- Respectively.

The movable bearing 140 may be moved between the first and second bushes 110 and 120 by predetermined control logic. As shown in the figure, the moving distance L of the moving bearing 140 can be changed because it is moved to the optimum bearing position according to the environment and operation RPM.

The movable bearing 140 is connected to an oil tank 150 for storing oil and an oil pump 160 connected to the oil tank for feeding oil to the moving bearing 140. A hose (not shown) for supplying oil is connected between the oil pump 150 and the moving bearing 140.

The moving bearing 140 is provided at an anti-nodal point of the vortex vibration of the propeller shaft 12.

In this case, the double point may refer to an optimal position where the bearing can be additionally installed as a period in which whirling vibration may occur between the first and second bushes 110 and 120. At this time, the position of the double point can be determined according to the results of the transverse vibration analysis of the ship propulsion shaft system.

The movable bearing 130 may be formed of any one of a tilting-pad bearing and a journal bearing.

FIG. 4 is a view showing the operation of a propulsion shaft bearing device for a ship according to a second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line A-A 'shown in FIG.

4 and 5, the ship propulsion shaft bearing device 100 according to the second embodiment of the present invention includes a moving means 130 for moving the moving bearing 130 between the first and second bushes 110 and 120, (170).

The moving means 170 may include a guide rail 171, a screw shaft 172, and a driving motor 173.

The guide rail 171 is connected between the first and second bushes 110 and 120 to guide the movement of the movable bearing 130.

The screw shaft 172 is connected between the first and second bushes 110 and 120 but does not interfere with the guide rail 171. The screw shaft 172 has a structure in which the screw shaft 172 is moved by a screw thread to provide a moving path of the movable bearing 130.

The drive motor 173 has a function of rotating the screw shaft 172 to control the movement of the movable bearing 130. At this time, the drive motor 173 may be driven by a controller (not shown) if the optimal position of the movable bearing 130 is determined according to the RPM of the ship.

FIG. 6 is an operational view of a propulsion shaft bearing device for a ship according to a third embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along line B-B 'of FIG.

6 and 7, the moving means 170 of the propelling shaft bearing device 100 for a marine vessel according to the third embodiment of the present invention is configured to be driven by a hydraulic cylinder or hydraulic pressure.

That is, the moving unit 170 is configured to expand and contract the hinge shaft 175 connecting the curved bar 177 and the end of the curved bar 177 to move the movable bearing 130 to the first and second bushes 110, and 120, respectively.

The curved bar 177 has a curvature corresponding to the circumference of the propeller shaft 12 and is connected to the moving bearing 130.

The hinge shaft 175 is installed at each end of the plurality of curved bars 177 so that the curved bars 177 overlap and overlap or zigzag.

The curved bar 177 is provided with a hose fixing member 176 capable of fixing the oil hose 174.

The plurality of curved bars 177 may include a separate connecting member (not shown) for connecting each curved bar 177. The connecting member has a function of guiding the expansion and contraction adjustment when the curved bar 177 is stretched or shrunk by the oil hose 174.

Also, the connecting member may be linked to the curved bar 177 in a linking manner to provide a driving force so that the curved bar 177 can be elastically adjusted in a zigzag manner.

As described above, according to one embodiment of the present invention, the propulsion shaft bearing device for a ship can effectively reduce the lateral vibration of the propeller shaft storage calendar through a bearing movable in the stern tube according to the resonance mode.

The bearing propulsion shaft bearing device according to one embodiment of the present invention has been described above.

It is to be understood that the terminology or words used in the foregoing detailed description and in the following claims should not be construed as limited to ordinary or dictionary meanings and the inventor shall not be construed to limit the concept of the term to the best of his / Should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, It should be understood that water and variations may be present.

1: Ships
10: Ship Propulsion Device 11: Propeller
12: Propeller shaft 13: Motor shaft
14: main engine 15: intermediate shaft bearing
100: Ship propulsion shaft bearing device
110: first bush 120: second bush
130: Moving bearing 140: Stern tube
150: Oil tank
160: Oil pump
170: moving means 171: guide rail
172: screw shaft 173: drive motor
174: Oil hose 175: Hinge shaft
176: hose fixing member 177: curved bar

Claims

First and second bushings provided on the propeller shaft of the ship;
A movable bearing movable between the first and second bushes; And
And a stern tube surrounding the first and second bushes and the moving bearing.

The method according to claim 1,
The moving bearing
Wherein the propelling shaft bearing device is provided at an anti-nodal point of the propeller shaft whirling vibration.

The method according to claim 1,
The moving bearing
A tilting-pad bearing, and a journal bearing.

The method according to claim 1,
And a moving means for moving the moving bearing between the first and second bushes.

5. The method of claim 4,
The moving means
A guide rail connected between the first and second bushes to guide movement of the movable bearing;
A screw shaft for providing a moving path of the movable bearing; And
And a drive motor for rotating the screw shaft to control the movement of the movable bearing.

5. The method of claim 4,
Wherein the moving means is a hydraulic cylinder.