Tubular member, method for assembling tubular member, method for disassembling tubular member, gasket, stern tube sealing system, and ship

Abstract

As an example of the cylindrical member, the gasket has a divided cylindrical body formed by combining two members divided in the axial direction of the propeller shaft in the circumferential direction around the propeller shaft; a pair of grooves which are provided in the two members in the axial direction on two joining surfaces which abut against each other so as to face each other in the circumferential direction, and which, when the two joining surfaces come into contact with each other, form a through-hole which takes the axial direction as the axial direction by connecting openings in the joining surfaces with each other; a bar formed by extending in the axial direction and joining the two members by being inserted into the through hole has a cross-sectional shape of the groove in a cross-section orthogonal to the axial direction formed so that the width of the bottom surface side is greater than the width of the opening in the joining surface.

Description

TECHNICAL FIELD

[0001] The present application relates to a cylindrical member, a method for assembling a cylindrical member, a method for disassembling a cylindrical member, a gasket, a stern tube sealing system, and a ship. BACKGROUND

[0002] A cylindrical member such as a gasket that is embedded around a propeller shaft in a stern tube sealing system is known (Patent Literature 1, etc.).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent No. 6887584 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the case where the gasket of the stern tube sealing system is to be replaced, the gasket is generally structured as a cylindrical shape that is integrally formed so as to be able to be fitted around the propeller shaft, and thus other members around the gasket need to be removed, which is time-consuming and laborious. This problem is the same in other cylindrical members that have the same structure and setting conditions as the gasket.

[0008] An object of the present disclosure is to provide a cylindrical member, a method for assembling a cylindrical member, a method for disassembling a cylindrical member, a gasket, a stern tube sealing system, and a ship that can be easily set and disassembled.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] A cylindrical member according to one aspect of the present application includes: a split cylindrical body constituted by a plurality of members split along an axial direction and combined in a circumferential direction; a pair of grooves provided along the axial direction on two joint surfaces of two adjacent members of the plurality of members that oppose each other in the circumferential direction, and when the two joint surfaces are joined, openings on the joint surfaces are connected to each other to form a through-hole having the axial direction as an axial direction; and a rod member extending in the axial direction and joining the two members by being inserted into the through-hole, a cross-sectional shape of the groove in a cross section orthogonal to the axial direction being formed so that a width of a bottom surface side is larger than a width of the opening on the joint surface.

[0011] EFFECT OF THE INVENTION

[0012] According to the present disclosure, a cylindrical member, a method for assembling a cylindrical member, a method for disassembling a cylindrical member, a gasket, a stern tube sealing system, and a ship that can be easily set and disassembled can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 This is a diagram illustrating an example of the schematic structure of a stern tube sealing system according to an embodiment.

[0014] Figure 2 This is an oblique view of the liner implementation method as seen from the bow side.

[0015] Figure 3 This is an oblique view of the liner implementation method as seen from the stern side of the ship.

[0016] Figure 4 This is an exploded perspective view of the liner implementation method as seen from the stern side.

[0017] Figure 5 This is a diagram showing the first stage of the assembly sequence of the gasket in the embodiment.

[0018] Figure 6 This is a diagram showing the second stage of the assembly sequence of the gasket in the embodiment.

[0019] Figure 7 This diagram shows the third stage of the assembly sequence of the gasket in the embodiment.

[0020] Figure 8 This is a diagram showing the fourth stage of the assembly sequence of the gasket in the embodiment.

[0021] Figure 9 This is a diagram showing an example of the bar material in the first modified example.

[0022] Figure 10 This is a diagram showing an example of the third component of the bar assembly in the second variation.

[0023] Figure 11 This is a diagram showing an example of the cross-sectional shape of the through hole and the bar in the third modified example. Detailed Implementation

[0024] The embodiments will now be described with reference to the accompanying drawings. For ease of understanding, the same symbols will be used for the same structural elements in each drawing, and repeated descriptions will be omitted.

[0025] [Structure of the stern tube sealing system 200]

[0026] First, refer to Figure 1 The stern tube sealing system 200 is described to illustrate the implementation method. Figure 1 This is a diagram illustrating an example of the schematic structure of the stern tube sealing system 200 according to an embodiment.

[0027] like Figure 1As shown, the stern tube sealing system 200 is installed on the vessel 300. The stern tube sealing system 200 has a stern tube sealing device 10 around the propeller shaft 3 of the vessel 300, and mainly includes an air control unit 30, an oil tank unit 60, an oil pump unit 70 and a drainage recovery unit 80 within the vessel 300.

[0028] A bearing 2 is provided inside the stern tube 1, and the propeller shaft 3 is supported rotatably by the bearing 2. A protrusion 5A of the propeller 5 is fixed to the front end of the propeller shaft 3 on the stern side. Therefore, the propeller shaft 3 is driven to rotate, and the driving force is transmitted to the propeller 5 through the protrusion 5A, causing the propeller 5 to rotate.

[0029] A gasket 4 is embedded around the propeller shaft 3. The gasket 4 has a cylindrical portion 4A and a flange portion 4B. The cylindrical portion 4A is a cylindrical part that abuts against the outer peripheral surface of the propeller shaft 3. The inner diameter of the cylindrical portion 4A is approximately the same as the diameter of the propeller shaft 3. The flange portion 4B is provided at the stern end of the cylindrical portion 4A and is an annular part that extends radially outward from the cylindrical portion 4A. The flange portion 4B is formed such that it is disposed opposite to the bow end face of the protrusion 5A of the propeller 5 and is fixed to this end face by any structure such as bolts. Thus, the gasket 4 rotates integrally with the propeller shaft 3 and the propeller 5.

[0030] On the outer periphery of the gasket 4, a concentric cylindrical shell 7 is provided surrounding the gasket 4, and the shell 7 is fixed to the stern tube 1 by bolts. The stern tube sealing device 10 includes the shell 7, the packing ring 8, and four sealing rings 9 (from the stern side, they are the first sealing ring 9A, the second sealing ring 9B, the third sealing ring 9C, and the fourth sealing ring 9D).

[0031] The housing 7 is formed by six segmented housings 6, each of which is a cylindrical component. These components are fixed to the stern tube 1 in a stacked manner, interlocked and axially aligned with each other on the propeller shaft 3. Furthermore, when each segmented housing 6 is engaged with an adjacent segmented housing 6, a sealing ring 9 is held between two segmented housings 6. A packing ring 8, formed of a circular elastic component, is externally embedded in the gasket 4. The packing ring 8 rotates integrally with the gasket 4 and slides on the housing 7, preventing foreign objects such as fishing nets from entering the stern tube sealing device 10 and the stern tube 1.

[0032] Each sealing ring 9 is positioned so that its lip portion, formed at the center side of the annular shape, contacts the outer peripheral surface of the gasket 4 and is tightly attached to the side of the gasket 4.

[0033] The molding material for the sealing ring 9, which is an elastic component, can be a rubber material or a resin material other than rubber. Examples of rubber materials include nitrile rubber (NBR), fluororubber (FR), natural rubber (NR), isobutylene rubber (IR), butadiene rubber (BR), and styrene-butadiene rubber (SBR). Examples of resin materials other than rubber include polytetrafluoroethylene (PTFE), polyetherketone (PEEK), fluoropolymers, and polyamides (PA).

[0034] The first sealing ring 9A and the second sealing ring 9B are configured with their lips facing the stern side, and the third sealing ring 9C and the fourth sealing ring 9D are configured with their lips facing the bow side. Furthermore, annular chambers are formed between adjacent sealing rings 9, and from the stern side, a first air chamber 20A, a second air chamber 20B (both examples of air chambers), and a first oil chamber 20C (an example of an oil chamber) are formed sequentially. In addition to the example shown in the figure, a stern tube sealing device with three sealing rings 9 can also be used. In this embodiment, the first sealing ring from the stern side is configured with its lip facing the stern side, and the second and third sealing rings are configured with their lips facing the bow side.

[0035] An air supply passage 51 extending from the air control unit 30 is connected to the second air chamber 20B. Air supplied from the air source 38 is supplied to the second air chamber 20B via the air control unit 30 and the air supply passage 51. Furthermore, using this supplied air, the lips of the second sealing ring 9B and the first sealing ring 9A are pushed upward in sequence, discharging the air into the seawater.

[0036] On the other hand, the oil supply passage 56 is connected to the first oil chamber 20C. The lubricating oil supplied by the oil tank unit 60 is supplied to the oil pump unit 70 through the oil supply passage 55, and the lubricating oil is supplied from the oil pump unit 70 to the first oil chamber 20C through the oil supply passage 56.

[0037] A secondary oil supply passage 56 branches off from the oil pump unit 70. One oil supply passage 56 supplies lubricating oil to the first oil chamber 20C, and the other oil supply passage 56 supplies lubricating oil to the third oil chamber 20E. This lubricating oil ensures smooth sliding of the bearing 2. The lubricating oil supplied to the third oil chamber 20E is then supplied to the second oil chamber 20D, which is an annular chamber formed between the fourth sealing ring 9D on the stern side of the bearing 2 and the bearing 2. A return oil passage 54 connects to the third oil chamber 20E, and the lubricating oil is recovered by the oil tank unit 60 through the return oil passage 54.

[0038] The air control unit 30 is connected to the second air chamber 20B via the air supply passage 51, controlling the pressure and flow rate of the air (compressed air) supplied to the second air chamber 20B from the air source 38. Additionally, the air control unit 30 is connected to the oil tank 61 constituting the oil tank unit 60 via the pressurization passage 52, controlling the chamber pressure of the oil tank 61. The air control unit 30 is connected to the terminal device 100 (e.g., a tablet) via a wired or wireless communication method, and performs actions or parameter adjustments through a management application built into the terminal device 100. Detailed structural description of the air control unit 30 is omitted. Alternatively, the air control unit 30 may also be a device that does not connect to the terminal device 100 (e.g., a tablet) and uses only a so-called mechanical structure.

[0039] The oil tank unit 60 includes an oil tank 61 and a valve 62, which is located midway through the return oil passage 54 and is normally open. By pressurizing the oil tank 61 with the pressure of air supplied via the pressurization passage 52, the oil pressure of the lubricating oil in the first oil chamber 20C to the third oil chamber 20E is controlled to always be higher than the seawater pressure or the air chamber pressures of the first air chamber 20A and the second air chamber 20B by a certain degree. By controlling the oil chamber pressure of the first oil chamber 20C to always be higher than the air chamber pressure of the second air chamber 20B, and by positioning the lip of the third sealing ring 9C towards the bow side, the lubricating oil in the first oil chamber 20C can always press the lip of the third sealing ring 9C against the gasket 4. Thus, the lip of the third sealing ring 9C is always in sliding contact with the gasket 4, preventing lubricating oil leakage from the first oil chamber 20C to the second air chamber 20B.

[0040] The oil pump unit 70, starting from the oil tank 61 side, includes a filter 71, a circulation pump 72, a cooler 73, and a valve 74. The valve 74 is located at a branch point of the oil supply passage 56 extending from the cooler 73 and is normally open. The oil pump unit 70 supplies lubricating oil from the oil tank unit 60 to the first oil chamber 20C and the third oil chamber 20E. Through the sliding surface between the gasket 4 and the third sealing ring 9C and the fourth sealing ring 9D, the lubricating oil is supplied to the second oil chamber 20D. Then, the lubricating oil returns from the third oil chamber 20E to the oil tank unit 60 via the return passage 54, thus ensuring continuous circulation of the lubricating oil.

[0041] To drain fluids such as seawater or lubricating oil from the second air chamber 20B, the drainage recovery unit 80 has a drainage passage 57 leading to the second air chamber 20B and a valve 83 that is normally open midway through the drainage passage 57. The drainage recovery unit 80 also includes a drainage discharge machine 81 (automatic drainage) and a needle valve 82. Seawater or lubricating oil is recovered by the drainage discharge machine 81 and automatically discharged when a certain amount has accumulated.

[0042] Normally, only air is discharged from the second air chamber 20B via the drainage recovery unit 80. However, in the event of seawater or lubricating oil leakage into the second air chamber 20B, a small amount of pressurized air will be discharged through the always-open needle valve 82, and the leaked seawater or lubricating oil will be recovered by the drainage recovery unit 80.

[0043] [Structure of Pad 4]

[0044] Next, refer to Figures 2-4 The structure of the liner 4 in the embodiment will be explained. Figure 2 This is an oblique view of the liner 4 as seen from the stern side of the ship. Figure 3 This is an oblique view of the liner 4 as seen from the bow side. Figure 4 This is an exploded perspective view of the liner 4 as seen from the stern side of the ship.

[0045] In the following description, the X, Y, and Z directions are mutually perpendicular. The X and Y directions are horizontal, and the Z direction is vertical. The X direction is the fore-and-aft direction of the ship 300; the positive X direction side is the stern side, and the negative X direction side is the bow side. Additionally, the X direction is also the axis direction of the propeller shaft 3. The Y direction is the port-to-port width direction of the ship 300. Furthermore, for ease of explanation, the positive Z direction side will sometimes be referred to as the upper side, and the negative Z direction side as the lower side.

[0046] like Figure 2 , Figure 3 As shown, the gasket 4 is a cylindrical component. The gasket 4 has a cylindrical portion 4A and a flange portion 4B, with the flange portion 4B located at the end of the cylindrical portion 4A on the X-direction side (stern side). A plurality of through holes 4C are provided on the flange portion 4B. The plurality of through holes 4C are formed such that they penetrate the flange portion 4B along the X-direction and are arranged at approximately equal intervals along the circumferential direction of the annular shape of the flange portion 4B.

[0047] The end face of the flange portion 4B on the X-direction side is formed to be the same as the end face of the cylindrical portion 4A on the X-direction side. That is, the gasket 4 has a planar end face 4D on the X-direction side (stern side). The end face 4D and the protrusion 5A of the propeller 5 (see reference) are connected. Figure 1 With the end face of the bow side (X negative direction side) of the ship in contact, the gasket 4 is fixed to the propeller 5 in a manner that allows it to rotate integrally with the propeller 5 by inserting fastening components such as bolts through multiple through holes 4C from the X negative direction side and fastening them to the protrusion 5A.

[0048] In addition, the gasket 4 also has a planar end face 4E on the negative X-direction side (bow side). End face 4E is the end face of the cylindrical part 4A.

[0049] like Figures 2-4As shown, the gasket 4 is a segmented cylindrical body, composed of two parts divided along the axial direction (X direction) of the propeller shaft 3, which are then assembled circumferentially around the propeller shaft 3. For example, as... Figures 2-4 As shown, the gasket 4 includes a first segment 41 and a second segment 42, which are cylindrically divided into two parts along the Y direction at the center position in the Z direction. The first segment 41 is a semi-cylindrical component with an opening in the negative Z direction, and the second segment 42 is a semi-cylindrical component with an opening in the positive Z direction. The first segment 41 is located on the positive Z direction side, and the second segment 42 is located on the negative Z direction side. The first segment 41 and the second segment 42 are equivalent to "two components" constituting the segmented cylindrical body of the gasket 4.

[0050] like Figure 4 As shown, the first segment 41 has a first mating surface 411 and a second mating surface 412 as end faces on the negative Z direction side. The first mating surface 411 is an end face disposed on the positive Y direction side relative to the central axis of the gasket 4, and the second mating surface 412 is an end face disposed on the negative Y direction side.

[0051] A first groove 413 is provided on the first mating surface 411. The first groove 413 is recessed from the first mating surface 411 toward the positive Z-direction and extends along the axial direction (X-direction). The first groove 413 has an opening 413A and a widening portion 413B. The opening 413A is the portion that opens onto the first mating surface 411 and includes the opening of the first groove 413. The widening portion 413B is the portion located on the positive Z-direction side of the opening 413A and includes the bottom surface of the first groove 413. The widening portion 413B extends on both sides of the opening 413A in the Y-direction, thereby making the dimension in the Y-direction larger than that of the opening 413A.

[0052] A second groove 414 is provided on the second mating surface 412. The second groove 414 is formed by recessing from the second mating surface 412 toward the Z-direction and extends along the axial direction (X direction). The second groove 414 has an opening 414A and a widening portion 414B. The opening 414A is the portion that opens on the second mating surface 412 and includes the opening of the second groove 414. The widening portion 414B is the portion located on the Z-direction side of the opening 414A and includes the bottom surface of the second groove 414. The widening portion 414B extends on both sides of the opening 414A in the Y direction, thereby making the dimension in the Y direction larger than that of the opening 414A.

[0053] The cross-sectional shapes of the first groove 413 and the second groove 414 of the first segment 41, orthogonal to the axial direction (X direction), are such that the width of the bottom side (i.e., the width of the widened portions 413B and 414B in the Y direction) is larger than the width of the openings on the first mating surface 411 and the second mating surface 412 (i.e., the width of the openings 413A and 414A in the Y direction). In this embodiment, the cross-sectional shapes of the first groove 413 and the second groove 414 are formed in a T-shape.

[0054] like Figure 4 As shown, the second segment 42 has a first mating surface 421 and a second mating surface 422 as end faces on the positive Z-direction side. The first mating surface 421 is an end face disposed on the positive Y-direction side relative to the central axis of the gasket 4, and the second mating surface 422 is an end face disposed on the negative Y-direction side.

[0055] A first groove 423 is provided on the first mating surface 421. The first groove 423 is recessed from the first mating surface 421 toward the negative Z-direction and extends along the axial direction (X-direction). The first groove 423 has an opening 423A and a widening portion 423B. The opening 423A is the portion that opens onto the first mating surface 421 and includes the opening of the first groove 423. The widening portion 423B is the portion located on the negative Z-direction side of the opening 423A and includes the bottom surface of the first groove 423. The widening portion 423B extends on both sides of the opening 423A in the Y-direction, thereby making the dimension in the Y-direction larger than that of the opening 423A.

[0056] A second groove 424 is provided on the second mating surface 422. The second groove 424 is recessed from the second mating surface 422 in the negative Z direction and extends along the axial direction (X direction). The second groove 424 has an opening 424A and a widening portion 424B. The opening 424A is the portion that opens on the second mating surface 422 and includes the opening of the second groove 424. The widening portion 424B is the portion located on the positive Z direction side compared to the opening 424A and includes the bottom surface of the second groove 424. The widening portion 424B extends on both sides in the Y direction relative to the opening 424A, thereby making the dimension in the Y direction larger than that of the opening 424A.

[0057] The cross-sectional shapes of the first groove 423 and the second groove 424 of the second segment 42, on the cross-section orthogonal to the axial direction (X direction), are such that the width of the bottom side (i.e., the width of the widened portions 423B and 424B in the Y direction) is larger than the width of the openings on the first joint surface 421 and the second joint surface 422 (i.e., the width dimensions of the openings 423A and 424A in the Y direction). In this embodiment, the cross-sectional shapes of the first groove 423 and the second groove 424 are formed into a T-shape.

[0058] When the first segment 41 and the second segment 42 are joined, the first joining surface 411 of the first segment 41 and the first joining surface 421 of the second segment 42 abut against each other along the circumference of the cylindrical portion 4A. Furthermore, since the cylindrical portions of the first segment 41 and the second segment 42 are formed with the same thickness, the first joining surface 411 of the first segment 41 and the first joining surface 421 of the second segment 42 are formed with the same shape. Thus, the first joining surfaces 411 and 421 completely overlap and abut against each other.

[0059] Furthermore, the first groove 413 provided on the first mating surface 411 of the first segment 41 and the first groove 423 provided on the first mating surface 421 of the second segment 42 are formed such that their respective openings are located at the same position in the Y direction. Thus, as Figure 2 , Figure 3 As shown, when the first mating surface 411 of the first segment 41 abuts against the first mating surface 421 of the second segment 42, the openings on the mating surfaces connect with each other, thereby forming a first through hole 49 with the axial direction (X direction) of the gasket 4 as the axis direction. In this embodiment, the cross-sectional shapes of the first grooves 413 and 423 on the cross-section orthogonal to the axial direction (X direction) are both T-shaped, so the cross-sectional shape of the first through hole 49 is formed as H-shaped.

[0060] Similarly, when the first segment 41 and the second segment 42 are joined, the second joining surface 412 of the first segment 41 and the second joining surface 422 of the second segment 42 abut against each other along the circumferential direction of the cylindrical portion 4A. Furthermore, since the cylindrical portions of the first segment 41 and the second segment 42 are formed with the same thickness, the second joining surface 412 of the first segment 41 and the second joining surface 422 of the second segment 42 are formed with the same shape. Thus, the second joining surfaces 412 and 422 completely overlap and abut against each other.

[0061] Furthermore, the second groove 414 provided on the second mating surface 412 of the first dividing body 41 and the second groove 424 provided on the second mating surface 422 of the second dividing body 42 are formed such that their respective openings are located at the same position in the Y direction. Thus, as Figure 2 , Figure 3 As shown, when the second mating surface 412 of the first segment 41 abuts against the second mating surface 422 of the second segment 42, the openings on the mating surfaces connect with each other, thereby forming a second through hole 50 with the axial direction (X direction) of the gasket 4 as the axis direction. In this embodiment, the cross-sectional shapes of the second grooves 414 and 424 on the cross-section orthogonal to the axial direction (X direction) are both T-shaped, so the cross-sectional shape of the second through hole 50 is formed as H-shaped.

[0062] like Figure 4 As shown, a pin hole 417 is provided on the first mating surface 411 of the first segment 41, recessed from the mating surface towards the positive Z direction. On the other hand, a pin hole 427 is also provided on the first mating surface 421 of the second segment 42, recessed from the mating surface towards the negative Z direction. The two pin holes 417 and 427 are formed such that their openings are located at the same positions in the X and Y directions. Therefore, when the first mating surface 411 of the first segment 41 and the first mating surface 421 of the second segment 42 come into contact, the two pin holes 417 and 427 are connected linearly along the Z direction. Then, a needle 47 is inserted into these two pin holes 417 and 427. Preferably, the cross-sectional shape of the needle 47 is approximately the same as that of the pin holes 417 and 427.

[0063] Similarly, a pin hole 418 is provided on the second mating surface 412 of the first segment 41, recessed from the mating surface towards the positive Z direction. On the other hand, a pin hole 428 is also provided on the second mating surface 422 of the second segment 42, recessed from the mating surface towards the negative Z direction. The two pin holes 418 and 428 are formed such that their respective openings are at the same position in the X and Y directions. Therefore, when the second mating surface 412 of the first segment 41 abuts against the second mating surface 422 of the second segment 42, the two pin holes 418 and 428 are connected linearly along the Z direction. Then, a needle 48 is inserted into these two pin holes 418 and 428. Preferably, the cross-sectional shape of the needle 48 is approximately the same as that of the pin holes 418 and 428.

[0064] By using two needles 47 and 48, the relative positional relationship between the first segment 41 and the second segment 42 in the X and Y directions can be maintained, thereby ensuring that the first mating surfaces 411 and 421 completely overlap and abut against each other. This also ensures that the openings of the first grooves 413 and 423 are arranged to completely overlap, thus neatly forming the first through hole 49 and preventing it from deviating along the Y direction on the mating surface. Similarly, it ensures that the openings of the second grooves 414 and 424 are arranged to completely overlap, thus also neatly forming the second through hole 50 and preventing it from deviating along the Y direction on the mating surface.

[0065] like Figure 4As shown, in the portion of the first segment 41 corresponding to the flange portion 4B, a cutout portion 415 is provided at the end on the negative Y-direction side, recessed from the outer circumferential surface of the annular shape to the positive Y-direction side. The cutout portion 415 is formed in such a way that a portion of the portion of the first segment 41 corresponding to the flange portion 4B is retained from the second mating surface 412 to a predetermined height position on the positive Z-direction side. That is, on the negative Z-direction side of the cutout portion 415, a protruding portion extending from the center side of the first segment 41 along the negative Y-direction is retained. A bolt insertion hole 416 formed through the Z-direction is provided in this protruding portion. On the other hand, on the second mating surface 412 of the second segment 42, a bolt engagement hole 430 formed recessed along the negative Z-direction and with an internal thread groove engraved on its inner circumferential surface is provided at a position overlapping with the bolt insertion hole 416. When the first segment 41 and the second segment 42 are engaged, the bolt 45 is inserted into the bolt insertion hole 416 from the Z positive direction side, and is connected and fixed in the state where the second engagement surface 412 of the first segment 41 and the second engagement surface 422 of the second segment 42 are in contact with each other by screwing into the bolt engagement hole 430.

[0066] Similarly, in the portion of the second segment 42 corresponding to the flange portion 4B, a cutout portion 425 is provided at the end on the positive Y-direction side, recessed from the outer circumferential surface of the annular shape to the negative Y-direction side. The cutout portion 425 is formed in such a way that a portion of the portion of the second segment 42 corresponding to the flange portion 4B is retained from the first mating surface 421 to a predetermined height position on the negative Z-direction side. That is, on the positive Z-direction side of the cutout portion 425, a protruding portion extending from the center side of the second segment 42 along the positive Y-direction is retained. A bolt insertion hole 426 formed through the Z-direction is provided in this protruding portion. On the other hand, on the first mating surface 411 of the first segment 41, a bolt engagement hole 420 recessed along the negative Z-direction and with an internal thread groove engraved on its inner circumferential surface is provided at a position overlapping with the bolt insertion hole 426. When the first segment 41 and the second segment 42 are engaged, the bolt 46 is inserted into the bolt insertion hole 426 from the negative Z direction side, and is connected and fixed in the state where the first engagement surface 411 of the first segment 41 and the first engagement surface 421 of the second segment 42 are engaged by screwing into the bolt engagement hole 420.

[0067] Furthermore, by employing a structure that fastens bolt 45 from the side of the first segment 41 and bolt 46 from the side of the second segment 42, two bolts 45 and 46 can be fastened in opposite directions in the Z direction and at equal distances along the Y direction from the axial center of the gasket 4. Therefore, the first segment 41 and the second segment 42 can be connected and fixed evenly.

[0068] like Figure 4 As shown, the liner 4 also includes a first bar group 43 and a second bar group 44. (As...)Figure 2 , Figure 3 As shown, the first bar assembly 43 is formed extending along the axial direction of the first through hole 49, and is the element that joins the first segment 41 and the second segment 42 by inserting into the first through hole 49. The second bar assembly 44 is formed extending along the axial direction of the second through hole 50, and is the element that joins the first segment 41 and the second segment 42 by inserting into the second through hole 50.

[0069] like Figure 4 As shown, the first bar assembly 43 has a pair of first components 431 and 432 and a second component 433. One first component 431 is inserted into the stern side (positive X direction side) end of the first through hole 49. The other first component 432 is inserted into the bow side (negative X direction side) end of the first through hole 49. The second component 433 is inserted through the first through hole 49 at a midpoint between the stern side first component 431 and the bow side first component 432.

[0070] The cross-sectional shape of the pair of first components 431 and 432 is the same as that of the first through hole 49. In this embodiment, since the cross-sectional shape of the first through hole 49 is H-shaped, the cross-sectional shapes of the first components 431 and 432 are also H-shaped, just like the first through hole 49. That is, a first component 431 includes a first flat plate portion 431A, a second flat plate portion 431B, and a connecting portion 431C. The first flat plate portion 431A has the same shape as the widened portion 413B of the first groove 413 of the first segment 41 and extends in the Y direction. The second flat plate portion 431B has the same shape as the widened portion 423A of the first groove 423 of the second segment 42 and extends in the Y direction. The connecting portion 431C has the same shape as the opening portion 413A of the first groove 413 and the opening portion 423A of the first groove 423 and extends in the Z direction to connect the first flat plate portion 431A and the second flat plate portion 431B. Similarly, the other first component 432 includes a first flat plate portion 432A, a second flat plate portion 432B, and a connecting portion 432C. The first flat plate portion 432A has the same shape as the widened portion 413B of the first groove 413 of the first segment 41 and extends in the Y direction. The second flat plate portion 432B has the same shape as the widened portion 423A of the first groove 423 of the second segment 42 and extends in the Y direction. The connecting portion 432C has the same shape as the opening portion 413A of the first groove 413 and the opening portion 423A of the first groove 423 and extends in the Z direction to connect the first flat plate portion 432A and the second flat plate portion 432B. Moreover, the shape of the pair of first components 431 and 432 is formed to be slightly smaller than the shape of the inner peripheral surface of the first through hole 49 so that it can be inserted into the first through hole 49.

[0071] The second component 433 has the same cross-sectional shape as the first groove 413 of the first segment 41, and has a base end portion 433A that inserts into the first groove 413 and a front end portion 433B that can enter the interior of the groove (widened portion 423B) from the opening (opening portion 423A) of the first groove 423 of the second segment 42. In this embodiment, the cross-sectional shape of the second component 433 is T-shaped.

[0072] like Figure 4 As shown, the second bar assembly 44 has a pair of first components 441 and 442 and a second component 443. One first component 441 is inserted into the stern side (positive X direction side) end of the second through hole 50. The other first component 442 is inserted into the bow side (negative X direction side) end of the second through hole 50. The second component 443 is inserted into the second through hole 50 at an intermediate position between the first component 441 on the stern side and the first component 442 on the bow side.

[0073] The cross-sectional shape of the pair of first components 441 and 442 is the same as that of the second through hole 50. In this embodiment, since the cross-sectional shape of the second through hole 50 is H-shaped, the cross-sectional shapes of the first components 441 and 442 are also the same as those of the second through hole 50, which is H-shaped. That is, a first component 441 includes a first flat plate portion 441A, a second flat plate portion 441B, and a connecting portion 441C. The first flat plate portion 441A has the same shape as the widened portion 414B of the second groove 414 of the first dividing body 41 and extends in the Y direction. The second flat plate portion 441B has the same shape as the widened portion 424B of the second groove 424 of the second dividing body 42 and extends in the Y direction. The connecting portion 441C has the same shape as the opening portion 414A of the second groove 414 and the opening portion 424A of the second groove 424 and extends in the Z direction to connect the first flat plate portion 441A and the second flat plate portion 441B. Similarly, another first component 442 includes a first flat plate portion 442A, a second flat plate portion 442B, and a connecting portion 442C. The first flat plate portion 442A has the same shape as the widened portion 414B of the second groove 414 of the first dividing body 41 and extends in the Y direction. The second flat plate portion 442B has the same shape as the widened portion 424B of the second groove 424 of the second dividing body 42 and extends in the Y direction. The connecting portion 442C has the same shape as the opening portion 414A of the second groove 414 and the opening portion 424A of the second groove 424, and extends in the Z direction to connect the first flat plate portion 442A and the second flat plate portion 442B. In addition, the outer shape of the pair of first components 441, 442 is formed to be slightly smaller than the shape of the inner peripheral surface of the second through hole 50 so that it can be inserted into the second through hole 50.

[0074] The second component 443 has the same cross-sectional shape as the second groove 424 of the second segment 42, and has a base end portion 443A that inserts into the second groove 424, and an end portion 443B that can enter the interior of the groove (widened portion 414B) from the opening (opening portion 414A) of the second groove 414 of the first segment 41. In this embodiment, the cross-sectional shape of the second component 443 is T-shaped.

[0075] In this embodiment, for example, known processing methods such as electrical discharge machining can be used to form the first groove 413 and the second groove 414 provided in the first partition 41, and the first groove 423 and the second groove 424 provided in the second partition 42.

[0076] For example, stainless steel-based materials can be used to form the first segment 41, the second segment 42, the first rod group 43, and the second rod group 44 constituting the pad 4 of this embodiment.

[0077] As an example of the cylindrical component in this embodiment, the gasket 4 includes: a segmented cylindrical body, which is formed by combining two components (first segment 41 and second segment 42) that are axially segmented along the propeller shaft 3 in the circumferential direction around the propeller shaft 3; a pair of grooves (first groove 413 of the first segment 41 and first groove 423 of the second segment 42, second groove 414 of the first segment 41 and second groove 424 of the second segment 42), and two mating surfaces (first and second) that abut against each other in the circumferential direction in the first segment 41 and the second segment 42. The first joint surface 411 of the first segment 41 and the first joint surface 421 of the second segment 42, and the second joint surface 412 of the first segment 41 and the second joint surface 422 of the second segment 42 are arranged along the axial direction. When the two joint surfaces abut, the openings on the joint surfaces connect with each other to form through holes (first through hole 49 and second through hole 50) with the axial direction as the axis. The rods (first rod group 43 and second rod group 44) extend along the axial direction and are joined by inserting through holes 49 and 50. The cross-sectional shape of each groove on the cross-section orthogonal to the axial direction is formed such that the width on the bottom side is larger relative to the width of the opening on the joint surface.

[0078] With this structure, simply inserting a rod into the through hole formed by a pair of grooves when the mating surfaces of the first segment 41 and the second segment 42 abut against each other allows the first segment 41 and the second segment 42 to be firmly joined, thus enabling the easy installation of a cylindrical component, such as a gasket 4. Similarly, simply removing the rod inserted into the through hole allows the first segment 41 and the second segment 42 to be easily separated, thus enabling the easy disassembly of the cylindrical component, such as a gasket 4.

[0079] Especially when the cylindrical component used in the embodiment is a gasket 4, it is necessary to replace the gasket 4 in the stern tube sealing system 200 where the gasket 4 is installed. However, with the existing gaskets that are integrally formed into a cylindrical shape, replacing the gasket requires disassembling the propeller 5 from the propeller shaft 3 first, and then pulling the gasket out of the propeller shaft 3, which is extremely time-consuming and labor-intensive. To address this existing problem, this embodiment can use a gasket 4 with a segmented cylindrical body. Therefore, the gasket 4 can be removed from the propeller shaft 3 simply by disassembling the gasket 4, without needing to remove the propeller 5 from the propeller shaft 3. This reduces the workload of replacing the gasket 4.

[0080] Furthermore, the shape of each groove forming the through holes 49 and 50 is such that the width of the bottom side is larger than the width of the opening. Therefore, the cross-sectional shape of each through hole 49 and 50 is such that the width dimension in the Y direction of the contact portion between the mating surfaces at the center of the Z direction is the thinnest, while the width dimension of the portion further in the positive Z direction and the negative Z direction increases. In addition, the cross-sectional shape of each rod inserted into the through holes 49 and 50 of this shape is also the same. By using such through holes and rods, the inner side of each groove forming the through hole can abut against the side of the rod inserted into the groove, thus preventing each groove from falling off relative to the rod in the Z direction. As a result, even under the application of external force, accidental separation of the first segment 41 and the second segment 42 can be prevented. In addition, since each groove can be prevented from moving relative to the rod in the Y direction, misalignment of the first segment 41 and the second segment 42 in the Y direction can be prevented. This allows the first segment 41 and the second segment 42 to be joined more stably.

[0081] Furthermore, in this embodiment, the joining structure of the first segment 41 and the second segment 42 is such that a rod extending axially is inserted into a through hole provided along the axial direction of the segmented cylindrical body formed by joining the first segment 41 and the second segment 42. With this structure, in the area where the joining surfaces of the first segment 41 and the second segment 42 abut, the rod extends throughout the entire axial direction, thus suppressing liquid or gas leakage at the joining portion of the segmented cylindrical body. Additionally, with this structure, the elements of the joining structure can be arranged inside the cylindrical component. Therefore, the elements of the joining structure are not exposed outside the cylindrical component after the segmented cylindrical body is joined, thereby suppressing the deterioration of each element and extending the lifespan of the cylindrical component.

[0082] Furthermore, the joining structure of the first segment 41 and the second segment 42 only requires a pair of grooves on the joining surface and a rod inserted into the through hole formed by these grooves. That is, it can be limited to the width of the joining surface. Therefore, even with a segmented cylindrical gasket 4, the wall thickness of a gasket integrally formed into a cylindrical shape can be reduced to the same extent as that of the cylindrical portion 4A. This allows for the lightweighting of cylindrical components such as the segmented cylindrical gasket 4. Additionally, since there is no need to provide bolt connections or other joining elements on the outer periphery of the cylindrical portion 4A, miniaturization of the cylindrical component is possible. These advantages of lightweighting and miniaturization expand the application range of cylindrical components and improve their versatility.

[0083] Furthermore, in the gasket 4, which is an example of a cylindrical component in this embodiment, the first rod group 43, which is an example of a rod, includes a pair of first components 431 and 432 and a second component 433. The pair of first components 431 and 432 are inserted into the two ends of the through hole 49 in the axial direction. The second component 433 is inserted into the through hole 49 at the middle position of the pair of first components 431 and 432, which are inserted into the two ends of the through hole 49. The cross-sectional shape of the pair of first components 431 and 432 in a cross-section orthogonal to the axial direction is the same as that of the through hole 49. The second component 433 has a base end 433A and a front end 433B. The cross-sectional shape of the base end 433A is the same as that of one of the two slots, and the front end 433B can enter the interior of the slot from the opening of the other slot.

[0084] Similarly, in the gasket 4, which is an example of a cylindrical component in this embodiment, the second rod group 44, which is an example of a rod, has a pair of first components 441 and 442 and a second component 443. The pair of first components 441 and 442 are inserted into the two ends of the through hole 50 in the axial direction. The second component 443 is inserted into the through hole 50 at the middle position of the pair of first components 441 and 442 when the pair of first components 441 and 442 are inserted into the two ends of the through hole 50. The cross-sectional shape of the pair of first components 441 and 442 in a cross-section orthogonal to the axial direction is the same as that of the through hole 50. The second component 443 has a base end 443A and a front end 443B. The cross-sectional shape of the base end 443A is the same as that of one of the two slots. The front end 443B can enter the interior of the slot from the opening of the other slot.

[0085] These structures allow the engaging portions of the through holes 49 and 50 with the rod to be defined as the portions at both ends of the holes for insertion into the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side. This makes it easier to assemble and disassemble the gasket 4, thereby improving work efficiency.

[0086] [Assembly and disassembly methods for pad 4]

[0087] Reference Figures 5-8 Instructions on how to assemble pad 4.

[0088] Figure 5 This diagram illustrates the first stage of the assembly process for the gasket 4 in the embodiment. (See diagram below.) Figure 5 As shown, in the first stage (insertion step), the base end 433A of the second component 433 of the first bar group 43 is inserted into the first groove 413 of the first segment 41. Similarly, the base end 443A of the second component 443 of the second bar group 44 is inserted into the second groove 424 of the second segment 42. In addition, in the first stage, a sealing material is applied to the second groove 414 of the first segment 41 and the first groove 423 of the second segment 42. Alternatively, a sealing material may be applied to the second components 433 and 443 of each insertion groove 413 and 424. Furthermore, a needle 47 is inserted into the needle hole 417 of the first segment 41, and a needle 48 is inserted into the needle hole 428 of the second segment 42.

[0089] Figure 6 This diagram illustrates the second stage of the assembly process for the gasket 4 in the embodiment. (See diagram below.) Figure 6 As shown, in the second stage (abutment step), the front end 433B of the second component 433, which protrudes from the opening of the first groove 413 of the first segment 41 after the first stage, is inserted into the opening of the first groove 423 of the second segment 42. Furthermore, the end 443B of the second component 443, which protrudes from the opening of the second groove 424 of the second segment 42, is inserted into the opening of the second groove 414 of the first segment 41. This causes the first mating surfaces 411 and 421 of the first segment 41 and the second segment 42, which constitute the segmented cylindrical body, to abut against each other, and the second mating surfaces 412 and 422. At this time, since a sealing material was applied in the first stage, the sealing material is filled in the gaps between the portions of the second components 433B and 443B inserted into each groove 423 and 414. In addition, in the second stage, needle 47 is inserted into the pin hole 427 of the second segment 42, and needle 48 is inserted into the pin hole 418 of the first segment 41, so that the relative positional relationship between the first segment 41 and the second segment 42 can be fixed as a constant position through the two needles 47 and 48.

[0090] Figure 7 This diagram illustrates the third stage of the assembly process for the gasket 4 in the embodiment. (See diagram below.) Figure 7As shown, in the third stage (insertion step), a first component 431 of the first rod group 43 is inserted into the opening at both ends of the first through hole 49 formed by the first groove 413 of the first segment 41 and the first groove 423 of the second segment 42, which is located on the stern side end face 4D of the pad 4, after the second stage. Similarly, another first component 441 of the second rod group 44 is inserted into the opening at both ends of the second through hole 50 formed by the second groove 414 of the first segment 41 and the second groove 424 of the second segment 42, which is located on the stern side end face 4D of the pad 4, after the second stage. In addition, in the third stage, bolt 45 is inserted into bolt insertion hole 416 of the first segment 41 and screwed into bolt engagement hole 430 of the second segment 42, and bolt 46 is inserted into bolt insertion hole 426 of the second segment 42 and screwed into bolt engagement hole 420 of the first segment 41.

[0091] Figure 8 This diagram illustrates the fourth stage of the assembly process for the gasket 4 in the embodiment. (See diagram below.) Figure 8 As shown, in the fourth stage (insertion step), a first component 432 of the first bar group 43 is inserted from the opening at both ends of the first through hole 49 along the axial direction, specifically from the opening on the bow side end face 4E of the pad 4. Similarly, another first component 442 of the second bar group 44 is inserted from the opening at both ends of the second through hole 50 along the axial direction, specifically from the opening on the bow side end face 4E of the pad 4.

[0092] The disassembly method of the gasket 4 can be performed in the reverse order of the assembly method. That is, it is performed in the following order: the step of pulling out the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side from the through holes 49 and 50; after the pulling out step, the separation step of separating one of the first segment 41 and the second segment 42 of the segmented cylindrical body inserted into the groove from the other; after the separation step, the extraction step of pulling out the second components 433 and 443 from the grooves 413 and 424.

[0093] Alternatively, for example, the purchaser of vessel 300 may order only the liner 4 from the manufacturer, who then sends the liner 4 in a temporarily assembled state to the purchaser. In this case, the purchaser first disassembles the received temporarily assembled liner 4 and assembles the liner 4 around the propeller shaft 3 of the vessel 300 to formally assemble the liner 4.

[0094] In this case, in the assembly method, it is preferable to form a temporary assembly state with protrusions in the axial direction of the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side, with one end of the protrusion at a reference point. Figure 7 , Figure 8 When inserted into the through holes 49 and 50 during the third and fourth stages (insertion steps) of the assembly procedure described, the protrusions from the openings of the through holes 49 and 50. In this case, during the extraction step of the disassembly method, the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side are extracted from the through holes 49 and 50 by grasping the protrusions and applying external force. This allows for easier extraction of the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side, thereby improving the efficiency of the disassembly operation.

[0095] Furthermore, in this case, when assembling the gasket 4, it is preferable to refer to Figure 7 , Figure 8 In the third and fourth stages (insertion steps) of the assembly procedure described above, after inserting the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side into the through holes 49 and 50, a process (cutting step) is performed after the fourth stage to remove the protrusions of each component. This process machines the end faces of the openings of the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side to be flush with the axial end faces of the segmented cylindrical body (i.e., the stern-side end face 4D and the bow-side end face 4E of the gasket 4). As a result, after formal assembly, a portion of the first rod group 43 and the second rod group 44 are formed into a shape that does not protrude from the end faces 4D and 4E of the gasket 4, thereby preventing the first rod group 43 and the second rod group 44 from breaking or falling off due to external forces, thus extending the lifespan of the gasket 4.

[0096] [First Variation]

[0097] Figure 9 This is a diagram showing an example of the first modified example of the bars 43A and 44A. In the embodiment described, a structure is shown in which the first bar group 43 and the second bar group 44 are divided into three parts along the axial direction of the through holes 49 and 50, respectively, but it can also be replaced by a single bar 43A and 44A along the axial direction.

[0098] In this case, such as Figure 9 As shown, in bars 43A and 44A, the cross-sectional shape at each position along the axial direction is H-shaped. Furthermore, it is preferable that the length L along the axial direction of each bar 43A and 44A is equal to the sum of the lengths of the components in the described embodiment, for example, as... Figure 9As shown, L is equivalent to the sum of the lengths of the first component 431, the other first component 432, and the second component 433 of the first bar group 43. The bars 43A and 44A connect the first segment 41 and the second segment 42 by being inserted into the through holes 49 and 50, respectively.

[0099] [Second Variation]

[0100] Figure 10 This is a diagram illustrating an example of the second component 434 of the bar assembly in the second modified example. In the described embodiment, for example, like... Figure 4 As shown, the front ends 433B and 443B of the second components 433 and 443 are formed to have the same width in the Z-direction extension direction in the cross-sectional shape, but are not limited to this, as long as the front ends 433B and 443B can be inserted into the interior of another slot.

[0101] For example, such as Figure 10 As shown in the second component 434, it can be a pointed shape with a narrower front end 434B. Here, the shape of the base end 434A of the second component 434 is the same as that of the base ends 433A and 443A in the above embodiment.

[0102] [3rd Variation]

[0103] Figure 11 This is a diagram illustrating an example of the cross-sectional shape of the through hole 49A and the rod 435 in the third variation. In this embodiment, the cross-sectional shapes of the first components 431 and 441 on the stern side and the first components 432 and 442 on the bow side of the through holes 49 and 50 and the rod assemblies 43 and 44 are shown to be H-shaped, but other shapes are also possible. In other words, the cross-sectional shape of each groove in the cross-section orthogonal to the axial direction of the gasket 4 can be formed such that the width on the bottom side is larger than the opening width on the mating surface. For example, like... Figure 11 Like the groove 429 of the second segment 42, the groove 419 of the first segment 41 can be shaped such that its width in the Y direction gradually increases relative to the opening of the groove as it approaches the bottom surface of the groove. In this case, the cross-sectional shape of the through hole 49A formed by the two grooves 419 and 429 becomes an hourglass shape, with the width of the opening portion of the mating surfaces 411 and 421 being the narrowest and gradually widening along the vertical direction. In this case, the cross-sectional shape of the rod 435 also becomes the same hourglass shape as the through hole 49A.

[0104] The embodiments described above have been illustrated with reference to specific examples. However, this disclosure is not limited to these specific examples. Structures that can be appropriately designed and modified by those skilled in the art to achieve the features of this disclosure are also included within the scope of this disclosure. The elements, their configurations, conditions, shapes, etc., of each of the above specific examples are not limited to the illustrated forms and can be appropriately modified. The elements of each of the specific examples can be appropriately combined as long as they do not create technical contradictions.

[0105] In the above embodiments, as an example of a cylindrical component, an example of a gasket 4 provided around the propeller shaft 3 in the stern tube sealing system 200 is described. However, any cylindrical component with the same structure as the gasket 4 can also be applied to components other than the gasket 4.

[0106] In addition, the gasket 4, which is exemplified as a cylindrical component in the above embodiment, is a structure that has a first dividing body 41 and a second dividing body 42 and divides the cylindrical shape into two parts. However, as long as the cylindrical component has a structure that combines multiple components that are divided along the axial direction of the cylindrical component into a divided cylindrical body in the circumferential direction of the cylindrical body, it can also be a structure in which three or more dividing bodies are joined together to form a cylindrical body.

[0107] Furthermore, in the gasket 4, which is exemplified as a cylindrical component in the above embodiment, the first rod assembly 43 inserted into the through hole 49 includes a first component 431, another first component 432, and a second component 433. In this structure, one first component 431 is inserted into the stern-side end of the through hole 49, another first component 432 is inserted into the bow-side end of the through hole 49, and the second component 433 is inserted into the middle position of the pair of first components 431 and 432. Alternatively, the stern-side first component 431 can not be inserted into the through hole 49. That is, the second component 433 can be inserted through the center of the through hole 49, and the other first component 432 can be inserted into the bow-side end of the through hole 49. In other words, it can also be a structure consisting of two parts: a first component 432 inserted into the bow side end of the first bar group 43 through the through hole 49, and a second component 433 inserted through the center of the through hole 49. In this structure, the stern side end of the through hole 49 becomes a cavity, and the first segment 41 and the second segment 42 are connected by the first bar group 43. However, even in this structure, the first segment 41 and the second segment 42 are connected at the flange portion 4B on the stern side by two bolts 45 and 46, so that the segments 41 and 42 can also be securely connected to the stern side portion of the gasket 4.

[0108] Similarly, in the gasket 4, exemplified as a cylindrical component in the described embodiment, the second rod assembly 44 inserted into the through hole 50 has a structure consisting of a first component 441, another first component 442, and a second component 443. In this structure, one first component 441 is inserted into the stern-side end of the through hole 50, another first component 442 is inserted into the bow-side end of the through hole 50, and the second component 443 is inserted into the middle position of the pair of first components 441 and 442. Alternatively, the stern-side first component 441 may not be inserted into the through hole 50. That is, the second component 443 may be inserted through the center of the through hole 50, and the other first component 442 may be inserted into the bow-side end of the through hole 50. In other words, it can also be a structure consisting of two parts: a first part 442 inserted into the bow side end of the second bar group 44 through the through hole 50, and a second part 443 inserted through the center of the through hole 50. In this structure, the stern side end of the through hole 50 becomes a void, and the first segment 41 and the second segment 42 are not connected by the second bar group 44. However, even in this structure, the first segment 41 and the second segment 42 are connected at the flange portion 4B on the stern side by two bolts 45 and 46, so that the segments 41 and 42 can also be securely connected on the stern side of the gasket 4.

[0109] In the gasket 4 used in the stern tube sealing system 200, the inner diameter portion on the stern side (X-direction side) is sometimes tapered. In such cases, the portion of the first component 431, 441, which is inserted into the stern side end of the through holes 49, 50 and protrudes from the through holes 49, 50, also needs to be cut into the same tapered shape as the inner diameter portion. Therefore, complex measures are required in the assembly process of the gasket 4. To address this, by adopting a structure that does not insert the first component 431, 441 into the stern side end of the through holes 49, 50, it is not necessary to machine the portion of the first component 431, 441 protruding from the through holes 49, 50 to be the same surface as the end face 4D on the stern side (X-direction side) of the gasket 4. Thus, the problem of not needing complex operations in the assembly process of the gasket 4 can be avoided.

[0110] Furthermore, in the absence of the first components 431 and 441, measures such as applying sealing material (liquid gaskets) to the first mating surfaces 411 and 421 and the second mating surfaces 412 and 422 of the first segment 41 and the second segment 42 to assemble the gasket 4, or inserting a gasket (sheet gasket) between the flange surface (end face 4D on the stern side) of the gasket 4 and the protrusion 5A of the propeller 5, can be taken to suppress liquid or gas leakage at the joint of the segmented cylindrical body, just as in the embodiment described above, even in a structure where the first components 431 and 441 are not inserted on the flange 4B side (stern side).

[0111] Furthermore, in the case where the segment 41 and 42 are connected to one end of the through holes 49 and 50 using a means other than rods such as bolts, a structure in which the first component is not inserted at one end of the through holes 49 and 50 can also be adopted. With these structures, similar to the embodiments described above, it is possible to easily install or disassemble the cylindrical component (e.g., the one with the gasket 4), extend the lifespan of the cylindrical component, simplify the assembly or disassembly of the cylindrical component, and improve work efficiency.

[0112] Symbol Explanation

[0113] 4. Gasket (cylindrical component)

[0114] 41 1st split body (split tubular body)

[0115] 411 First joint surface

[0116] 412 Second mating surface

[0117] 413 First slot

[0118] 414, Sec. 2

[0119] 42 2nd split body (split tubular body)

[0120] 421 First joint surface

[0121] 422 Second joint surface

[0122] 423 Slot 1

[0123] 424, slot 2

[0124] 43 Bar Stock Group 1 (Bar Stock)

[0125] 44 Bar Stock Group 2 (Bar Stock)

[0126] 431, 432, 441, 442 Part 1

[0127] 433, 443, 434 Part 2

[0128] 435 bar stock

[0129] 49 First through hole

[0130] 50 Second through hole

[0131] 1. Stern tube

[0132] 3. Propeller shaft

[0133] 5 propellers

[0134] 10. Stern tube sealing device

[0135] 200 Stern tube sealing system

[0136] 300 ships

Claims

1. A cylindrical member comprising: a split cylindrical body configured by a plurality of members split along an axial direction being combined in a circumferential direction; a pair of grooves provided along the axial direction on two engaging surfaces that face each other in the circumferential direction in adjacent two members of the plurality of members, and openings on the engaging surfaces being connected to each other to form a through-hole having the axial direction as an axis direction when the two engaging surfaces are in contact with each other; and a rod member formed so as to extend in the axial direction and to engage the two members by being inserted into the through-hole, wherein a sectional shape of the groove in a sectional plane orthogonal to the axial direction is formed so that a width of a bottom surface side is larger than a width of the opening on the engaging surface.

2. The cylindrical member according to claim 1, wherein the rod member includes: a first member inserted into at least one of both ends in the axial direction of the through-hole; and a second member inserted into the through-hole at a position between the pair of first members in a state where the pair of first members are inserted into both ends of the through-hole, wherein a sectional shape of the first member in the sectional plane is the same shape as the through-hole, and the second member has a base end portion whose sectional shape in the sectional plane is the same shape as one of the pair of grooves, and a front end portion capable of entering an inside of the other groove from the opening of the other groove.

3. The cylindrical member according to claim 1 or 2, wherein the sectional shape of the groove in the sectional plane is formed in a T-letter shape, and the sectional shape of the through-hole formed by the pair of grooves in the sectional plane is formed in an H-letter shape.

4. A method of assembling a cylindrical member, wherein the cylindrical member includes: a split cylindrical body configured by a plurality of members split along an axial direction being combined in a circumferential direction; a pair of grooves provided along the axial direction on two engaging surfaces that face each other in the circumferential direction in adjacent two members of the plurality of members, and openings on the engaging surfaces being connected to each other to form a through-hole having the axial direction as an axis direction when the two engaging surfaces are in contact with each other; and a rod member formed so as to extend in the axial direction and to engage the two members by being inserted into the through-hole, wherein a sectional shape of the groove in a sectional plane orthogonal to the axial direction is formed so that a width of a bottom surface side is larger than a width of the opening on the engaging surface, the rod member includes: a first member inserted into at least one of both ends in the axial direction of the through-hole; and a second member inserted into the through-hole at a position between the pair of first members in a state where the pair of first members are inserted into both ends of the through-hole, wherein a sectional shape of the first member in the sectional plane is the same shape as the through-hole, and the second member has a base end portion whose sectional shape in the sectional plane is the same shape as one of the pair of grooves, and a front end portion capable of entering an inside of the other groove from the opening of the other groove, and the method of assembling the cylindrical member includes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ a step of inserting the base end portion of the second member into one of the pair of grooves; a step of abutting the engaging surfaces of the two members of the split cylindrical body to each other by inserting the front end portion of the second member, which protrudes from the opening of the one groove after the step of inserting, into the opening of the other groove of the pair of grooves; and a step of inserting the first member from at least one of the opening portions of the through-hole formed by the pair of grooves in the axial direction after the step of abutting.

5. The assembly method of the cylindrical member according to claim 4, wherein the length of the first member in the axial direction is formed to have a protruding portion that protrudes from the opening portion of the through-hole when inserted into the through-hole in the step of inserting, the assembly method of the cylindrical member includes a step of cutting off the protruding portion after the first member is inserted into the through-hole in the step of inserting, so that the end surface of the first member on the opening portion side becomes the same surface as the end surface of the split cylindrical body in the axial direction.

6. A disassembly method of a cylindrical member, wherein the cylindrical member includes: a split cylindrical body configured by a plurality of members split in an axial direction and combined in a circumferential direction; a pair of grooves provided in two engaging surfaces that abut against each other in the circumferential direction in adjacent two members of the plurality of members in the axial direction, and openings in the engaging surfaces are connected to each other to form a through-hole having the axial direction as an axial direction when the two engaging surfaces are in contact with each other; and a rod member extending in the axial direction and engaging the two members by being inserted into the through-hole, a cross-sectional shape of the groove in a cross section orthogonal to the axial direction is formed to have a larger width on a bottom surface side than a width of the opening in the engaging surface, the rod member includes: a first member inserted into at least one of both ends of the through-hole in the axial direction; and a second member inserted into the through-hole at a position between the pair of first members inserted into both ends of the through-hole, a cross-sectional shape of the first member in the cross section is the same shape as the through-hole, the second member has a base end portion having the same shape as one of the pair of grooves in the cross-sectional shape of the cross section and a front end portion capable of entering an inside of the other groove from the opening of the other groove of the pair of grooves, the disassembly method of the cylindrical member includes: a step of extracting the first member from the through-hole; a step of separating one of the two members of the split cylindrical body into which the base end portion of the second member is inserted from the other after the step of extracting; a step of pulling out the second member from the groove after the step of separating.

7. The disassembly method of the cylindrical member according to claim 6, wherein The length of the first component in the axial direction is formed so that, in a state in which the second component is inserted into the through-hole halfway through the second component, a protruding portion protrudes from an opening of the through-hole before the extraction step, In the extraction step, the first component is extracted from the through-hole by holding the protruding portion and applying an external force.

8. A gasket to be fitted in a stern tube seal system provided with a stern tube seal device for preventing water from entering a ship by supplying air to the periphery of a propeller shaft of the ship, the gasket being fitted in a cylindrical gasket provided around the propeller shaft, comprising: a split cylindrical body composed of a plurality of components split in the axial direction of the propeller shaft and combined in the circumferential direction around the propeller shaft; a pair of grooves provided in two adjacent components among the plurality of components in the axial direction on two joint surfaces that face each other in the circumferential direction, and when the two joint surfaces are in contact with each other, openings on the joint surfaces are connected to each other to form a through-hole having the axial direction as an axial direction; and a rod member extending in the axial direction and joining the two components by being inserted into the through-hole. The cross-sectional shape of the groove in a cross section orthogonal to the axial direction is formed so that the width of the bottom surface is larger than the width of the opening on the joint surface.

9. The gasket according to claim 8, wherein the rod member includes: a first component inserted into at least the bow side of both ends in the axial direction of the through-hole; and a second component inserted into the through-hole in a state in which the pair of first components are inserted into both ends of the through-hole. The cross-sectional shape of the first component in the cross section is the same shape as the through-hole. The second component has a base end portion and a front end portion, the base end portion has the same shape as one of the pair of grooves in the cross-sectional shape of the cross section, and the front end portion is able to enter the inside of the other groove from the opening of the other groove.

10. A stern tube seal system comprising: a stern tube; a propeller shaft rotatably supported on the stern tube; a propeller fixed to the front end of the propeller shaft; a gasket according to claim 8 or 9; and a stern tube seal device provided on the outer peripheral side of the gasket for preventing water from entering the ship by supplying air to the periphery of the propeller shaft.

11. A ship provided with the stern tube seal system according to claim 10. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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