JP3054628U - Stern bearing structure in hull - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To sufficiently and easily secure waterproofness inside and outside a ship while using resin. SOLUTION: In order to rotatably support and fix a propeller shaft 10 to a stern frame 20, a cylindrical bush 30 and a sleeve 40 are prepared. Bush 30
Is in contact with the surface of the propeller shaft 10 via the lubricating oil, and the propeller shaft 10 rotates freely. A cylindrical sleeve 40 is press-fitted around the outer periphery of the bush 30.
A gap between the sleeve 40 and the stern frame 20 is filled and solidified with a first resin 50, and both ends of the first resin 50 are sealed with a second resin 60. The first resin 50 is in a cured state,
The second resin 60 has sufficient rigidity to fix the axis of the propeller shaft 10 with the accuracy required for navigation, and has sufficient flexibility to prevent cracking and peeling.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a stern bearing structure in a hull, and more particularly to a structure suitable for using a technique of fixing a bearing using a resin.

[0002]

[Prior art]

 The propeller shaft of the ship must be rotatably attached to the stern, and it is necessary to take measures to prevent seawater from entering. In other words, the stern bearing structure must function not only as a bearing for smoothly rotating the propeller shaft, but also as a waterproof wall for preventing seawater from entering. As a stern bearing structure having such a function, a stern bearing structure having a structure in which a cylindrical metal member is pressed into a stern frame has long been known. However, the press-fitting process during shipbuilding is a very time-consuming process. Thus, in recent years, a technology for fixing a bearing using a resin has been put to practical use. That is, an insertion hole having a sufficient margin is prepared at the stern portion, a cylindrical metal member is inserted into the insertion hole, and then resin is poured into the gap to be solidified. As described above, the stern bearing structure using resin has an advantage that the press-fitting step at the time of shipbuilding is not required.

[0003]

[Problems to be solved by the invention]

 However, the stern bearing structure using the resin described above has a problem that the outer peripheral surface of the resin is easily peeled from the inner peripheral surface of the stern frame. Generally, the resin expands thermally due to the exothermic reaction during curing and contracts due to the temperature drop after curing, so there is a high possibility that a part of the surface will peel off from the stern frame. Even after curing, if the temperature environment changes, such a peeling phenomenon is likely to occur. In this way, if the surface of the resin peels off, a gap on the order of μm is created between the resin and the stern frame, and through this gap, the lubricating oil in the shaft space flows out of the boat or reversely. In addition, seawater outside the vessel may enter the vessel, which is a major problem. Of course, in order to solve such a problem, conventionally, a method of attaching a sealing member such as an O-ring or welding a seal ring has been adopted, but any of these methods requires a complicated structure. This leads to a new problem that the number of processes for the process increases.

[0004] Therefore, an object of the present invention is to provide a stern bearing structure that can sufficiently and easily ensure waterproofness inside and outside of a ship despite using resin. .

[0005]

[Means for Solving the Problems]

 (1) A first aspect of the present invention is directed to a hull bearing structure that rotatably supports a propeller shaft of a hull at a stern, wherein an inner peripheral surface suitable for contacting the surface of the propeller shaft via lubricating oil. A bush having a cylindrical shape, a cylindrical sleeve fitted to the outer periphery of the bush, a stern frame accommodating the sleeve while maintaining a predetermined gap between the outer peripheral surface of the sleeve, and a sleeve. The first resin cured in a state filled in the gap between the stern frame and the resin cured along the outer periphery of the end of the sleeve so that the gap can be sealed. And a resin having sufficient rigidity to fix the axis of the propeller shaft in a cured state with an accuracy required for navigation, and the second resin is used as the first resin. As a result, After curing, in which cracks or peeling was to use a resin having a sufficient flexibility to not occur.

(2) According to a second aspect of the present invention, in the stern bearing structure of the hull according to the first aspect described above, the sleeve and the bush are provided at a plurality of positions necessary for supporting the propeller shaft. A combination is provided.

(3) A third aspect of the present invention is a stern bearing structure for a hull according to the first or second aspect described above, wherein the second stern bearing structure is provided along the outer periphery of both ends of each sleeve. The resin is filled.

(4) According to a fourth aspect of the present invention, in the stern bearing structure of the hull according to the above-described first to third aspects, at a boundary between the first resin and the second resin, The sponge is inserted.

[0009]

[Embodiment of the invention]

 Hereinafter, the present invention will be described based on an embodiment shown in the drawings. 1 (a) and 2 (a) are side sectional views showing a configuration of a stern bearing structure according to an embodiment of the present invention. This stern bearing structure functions as a bearing that rotatably supports the propeller shaft 10 of the hull at the stern. FIG. 2A shows a portion connected to the right side of the structure shown in FIG. 1A. Although not shown here, a screw is connected to the left end of the propeller shaft 10 in the drawing, and an engine is connected to the right end of the drawing. In the embodiment shown here, the propeller shaft 10 is supported on the hull by both the first structure shown in FIG. 1 (a) and the second structure shown in FIG. 2 (a). .

The first structure shown in FIG. 1A functions as a bearing for rotatably fixing the propeller shaft 10 with respect to a stern frame 20 which constitutes a part of the hull. The base is a bush 30 and a sleeve 40. The bush 30 is a cylindrical component having an inner peripheral surface suitable for coming into contact with the surface of the propeller shaft 10 via lubricating oil, and the main body portion is formed of a casting material. Is formed with a white metal layer having a thickness of about 2 mm. This white metal layer is made of an alloy that is easily compatible with the lubricating oil, and can smoothly contact the outer peripheral surface of the propeller shaft 10 via the lubricating oil. On the other hand, the sleeve 40 is a cylindrical component fitted to the outer periphery of the bush 30, and is made of a casting material or a steel pipe. The bush 30 is pressed into the sleeve 40, and the bush 30 and the sleeve 40 are fixed by frictional force and mechanical screw screws.

The stern frame 20 is a structure that constitutes a part of the hull, and its inner peripheral portion has a substantially cylindrical shape. The inner peripheral portion of the stern frame 20 forms a through hole suitable for accommodating the sleeve 40, but a predetermined space is provided between the outer peripheral surface of the sleeve 40 and the inner peripheral surface of the stern frame 20. A gap is maintained. This gap is filled with the first resin 50. As shown, in a state where the stern bearing structure is attached to the hull, the first resin 50 is hardened, and the sleeve 40 is securely joined to the stern frame 20 (the state of the sleeve 40). (Filled along the outer peripheral surface). However, in the manufacturing stage, the first resin 50 is in a liquid state, and the through holes 21, 22, and 23 provided in the side surfaces of the stern frame 20 are holes used for filling the liquid resin. Specifically, the through holes 22 and 23 are used to introduce a liquid resin, and the through hole 21 is used as an air vent hole.

As described above, the technique of fixing the stern bearing structure to the hull using the resin is a known technique disclosed in, for example, JP-A-8-40389. The feature of the present invention is that the second resin 60 is used in addition to the first resin 50, so that the outboard vessel can be sufficiently sealed. The state of sealing with the second resin 60 is shown in detail in FIGS. 1 (b) and 1 (c). FIGS. 1B and 1C are enlarged views of a portion B and a portion C of FIG. 1A, respectively. A sponge 70 is interposed at a boundary between the first resin 50 and the second resin 60. The sponge 70 functions as a stopper for preventing the resin from flowing out in the step of filling the liquid first resin 50. As described above, the first resin 50 fills the gap between the sleeve 40 and the stern frame 20 after stirring the main agent and the curing agent, and is cured. At this time, the temperature of the resin rises due to the chemical reaction, and falls again to the atmospheric temperature. Due to the shrinkage at the time of the temperature drop, partial separation occurs between the inner peripheral portion of the stern frame 20 and the outer peripheral portion of the resin (the inner peripheral portion of the stern frame 20 is intentionally exposed to a surface. Since the roughness is made rough, even if such partial peeling occurs, there is no problem in fixing force to the sleeve 40.) On the other hand, the second resin 60 is provided at both ends (the left end and the right end in FIG. 1A) of the sleeve 40 so as to seal a gap between the sleeve 40 and the stern frame 20. It is hardened while being filled along the outer circumference of ()).

Normally, a gap S between the propeller shaft 10 and the stern frame 20 is filled with lubricating oil. Therefore, if a gap is formed by the separation between the outer peripheral portion of the first resin 50 and the inner peripheral portion of the stern frame 20, the lubricating oil leaks into the sea through this gap, and conversely, May flow into the gap S. In the stern bearing structure according to the present invention, such a problem does not occur because the second resin 60 is completely sealed. Conventionally, in order to perform sealing, it was necessary to use a sealing member such as an O-ring or to weld a seal ring. However, in the present invention, sealing can be performed by the second resin 60. Therefore, an extra structure for fixing the sealing member is not required, and the process can be simplified. In particular, if the second resin 60 is filled along the outer peripheries of both ends (the left end and the right end in FIG. 1A) of the sleeve 40 as in the example shown in the figure, the strength is further increased. A good sealing effect can be obtained.

As described above, the stern bearing structure according to the present invention is characterized in that the sleeve 40 is fixed to the stern frame 20 with the first resin 50 and sealed with the second resin 60. On the point. Therefore, as the first resin 50 and the second resin 60, it is necessary to use a resin having conditions for fulfilling the respective functions.

First, the first resin 50 needs to have sufficient rigidity in the cured state to fix the axis of the propeller shaft 10 with the accuracy required for navigation, and the sleeve 40 It is necessary to fulfill the original function of firmly fixing the stern to the stern frame 20. For that purpose, it is necessary to use a resin having sufficient rigidity after curing. In this embodiment, an epoxy resin "Chockfast Orange" (registered trademark) manufactured by Philadelphia Resins Corporation of the United States is used.

On the other hand, the second resin 60 needs to have sufficient flexibility to prevent cracking or peeling during and after curing. The function of the second resin 60 is not to fix the sleeve 40 but to seal the first resin 50 in which the outer peripheral surface is likely to peel off. Therefore, the second resin 60 does not need rigidity for fixing the sleeve 40, but has a property that cracks and peeling do not occur even at the curing stage or over time after curing. Resin must be used. In this embodiment, an epoxy resin “Phylbond Orange” (registered trademark) manufactured by Philadelphia Resins Corporation of the United States is used. Since this resin has a certain degree of flexibility, no cracking or peeling occurs during the curing step, and even after the curing, the resin is caused by a temperature change between the sleeve 40 and the stern frame 20. Even if the relative position changes slightly, no cracking or peeling occurs.

In this embodiment, the propeller shaft 10 is supported at the location shown in FIG. 1A and also at the location shown in FIG. 2A. The structure shown in FIG. 2A has substantially the same structure as the structure shown in FIG. That is, the propeller shaft 10 is rotatably fixed to the stern frame 20 by the combination of the bush 30 and the sleeve 40. As described above, in practical use, a combination of a sleeve and a bush is provided at a plurality of necessary places (in this example, two places, but three or more places are possible), and the propeller shaft 10 is rotatable. It is preferable to fix them.

The stern frame 20 shown in FIG. 2A is slightly different in shape, etc. from the stern frame 20 shown in FIG. 1A, but has the same basic function. The bush 30 is pressed into the sleeve 40, and the sleeve 40 is housed in the stern frame 20. The gap between the sleeve 40 and the stern frame 20 is cured with the first resin 50 filled. The through holes 24 and 25 provided in the stern frame 20 are used when the liquid first resin 50 is introduced. Also in this case, the second resin 60 is used to seal the gap created between the first resin 50 and the stern frame 20. The state of sealing with the second resin 60 is shown in detail in FIGS. 2 (b) and 2 (c). 2 (b) and 2 (c) are enlarged views of a portion B and a portion C of FIG. 2 (a), respectively. A sponge 70 is also interposed at the boundary between the first resin 50 and the second resin 60.

Finally, for reference, a specific process for attaching the stern bearing structure according to the present invention to the hull will be described. First, a cylindrical bush 30 as shown in the front sectional view of FIG. In the drawing, the state where the propeller shaft 10 is inserted is shown for reference, but in the actual process, the propeller shaft 10 is not yet inserted at this point. On the inner peripheral surface of the bush 30, a white metal layer 35 (about 2 mm thick) made of an alloy that is easily compatible with the lubricating oil is formed. Perform the function of In this example, a bush 30 having an outer diameter D2 is provided to support the propeller shaft 10 having a diameter D1. Subsequently, a sleeve 40 as shown in FIG. 3B is prepared. In this example, the inner diameter of the sleeve 40 is D2 and the outer diameter is D2 + 30 to 50 mm. However, as a strict dimensional value, the inner diameter of the sleeve 40 is slightly smaller than D2, and is a dimension that allows the bush 30 to be press-fitted and fixed therein. Specifically, while the outer shape of the bush 30 is D2, the inner diameter of the sleeve 40 is set to (D2-0.005 mm), and a margin of 0.005 mm is secured. Therefore, when the bush 30 is pressed into the sleeve 40, the bush 30 is firmly fixed in the sleeve 40. FIG. 4 is a front sectional view showing a state after the press-fitting.

When the stern bearing structure according to the present invention is used, the step of press-fitting the bush 30 into the sleeve 40 can be performed not in the dock of a shipyard but in a factory. That is, all the steps up to obtaining the structure after press-fitting as shown in FIG. 4 can be performed in the factory. The above-mentioned margin of 0.005 mm is too small for press-fitting work at a dock in a shipyard, but is sufficient for press-fitting work in a factory.

When the structure shown in FIG. 4 is obtained in this manner, the structure is carried into a construction dock and attached to a hull. First, this structure is inserted into the stern frame 20, and the propeller shaft 10 is aligned. Subsequently, an operation of packing the sponge 70 is performed along the outer periphery of both ends of each sleeve 40, and further, the second resin 60 (filly bond orange) in a paste state is filled. Thereafter, a liquid first resin 50 (Chock First Orange) is poured from each injection hole and cured. Through the above steps, the operation of attaching the stern bearing structure to the hull as shown in FIGS. 1 (a) and 2 (b) is completed. Finally, the propeller shaft 10 is inserted into the bush 30.

[0022]

[Effect of the invention]

 As described above, according to the stern bearing structure according to the present invention, the two types of resin are used to fix and seal the sleeve, respectively. It is possible to ensure sufficient and easy waterproofing.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of a part of a stern bearing structure according to an embodiment of the present invention, and a partially enlarged view thereof.

FIG. 2 is a side sectional view and a partially enlarged view showing the configuration of another part of the stern bearing structure according to the embodiment of the present invention.

FIG. 3 is a front sectional view of the bush and the sleeve shown in FIGS. 1 and 2;

FIG. 4 is a front sectional view of a state in which the bush and the sleeve shown in FIG. 3 are fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Propeller shaft 20 ... Stern frame 21-25 ... Through hole 30 ... Bush 35 ... White metal layer 40 ... Sleeve 50 ... 1st resin 60 ... 2nd resin 70 ... Sponge B, C ... Enlarged part S ... Void part

Claims (4)

[Utility model registration claims] 1. A bearing structure for rotatably supporting a propeller shaft of a hull at a stern, comprising: a cylindrical bush having an inner peripheral surface suitable for coming into contact with a surface of a propeller shaft via lubricating oil; While maintaining a predetermined gap between the cylindrical sleeve fitted to the outer periphery of the bush and the outer peripheral surface of the sleeve,
A stern frame accommodating the sleeve, a first resin which is cured in a state filled in a gap between the sleeve and the stern frame, and the sleeve so that the gap can be sealed. Cured in a state filled along the outer periphery of the end of the second
Wherein the first resin has sufficient rigidity in a cured state to fix the axis of the propeller shaft with the accuracy required for navigation, and the second resin has a cured state. A stern bearing structure in a hull, which has sufficient flexibility so that cracks and peeling do not occur during and after hardening. 2. The stern bearing structure according to claim 1, wherein a combination of a sleeve and a bush is provided at each of a plurality of positions necessary for supporting the propeller shaft. . 3. The stern bearing structure in a hull according to claim 1, wherein the second resin is filled along the outer circumference of both ends of each sleeve. 4. The stern bearing structure according to claim 1, wherein a sponge is interposed at a boundary between the first resin and the second resin. Stern bearing structure.