Cylindrical member, method for assembling cylindrical member, method for disassembling cylindrical member, liner, stern pipe sealing system, and ship

Abstract

As an example of a cylindrical member according to the present invention, a liner includes: a divided cylindrical body that is configured by combining two components, which are divided along the axial direction of a propeller shaft, in a circumferential direction about the propeller shaft; a pair of grooves that are provided to the two components along the axial direction on two joining surfaces that face each other in the circumferential direction and are brought into contact with each other, and that form through-holes in which the axial direction is set as an axial line direction by linking openings on the joining surfaces when the two joining surfaces abut against each other; and rod members that are formed to extend in the axial line direction and join the two components by being inserted into the through-holes. The cross-sectional shape of the grooves in a cross section orthogonal to the axial direction is formed so that the width on the bottom surface sides is larger than the width of the openings on the joining surfaces.

Description

Cylindrical member, method for assembling cylindrical member, method for disassembling cylindrical member, liner, stern tube seal system, and ship

[0001] The present disclosure relates to a tubular member, a method for assembling a tubular member, a method for disassembling a tubular member, a liner, a stern tube seal system, and a ship.

[0002] For example, there is a cylindrical member such as a liner that is fitted around a propeller shaft in a stern tube seal system (see, for example, Patent Document 1).

[0003] Patent No. 6887584

[0004] However, when replacing the liner of a stern tube seal system, since the liner is generally formed as a single unit into a cylindrical shape so that it can fit around the propeller shaft, it is necessary to remove other surrounding parts, which requires a lot of labor and time. This problem is also true for other cylindrical components with similar structures and installation conditions as the liner.

[0005] An object of the present disclosure is to provide a tubular member that can be easily installed and removed, a method for assembling a tubular member, a method for disassembling a tubular member, a liner, a stern tube seal system, and a ship.

[0006] A tubular member according to one aspect of an embodiment of the present invention comprises a split tubular body constructed by combining a plurality of parts divided along the axial direction in the circumferential direction, a pair of grooves provided along the axial direction on two adjacent joining surfaces of the plurality of parts that face each other in the circumferential direction and contact each other, and which form a through hole with the axial direction as the axial direction by connecting openings on the joining surfaces when the two joining surfaces abut, and a rod material formed to extend along the axial direction and inserted into the through hole to join the two parts, wherein the cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed so that the width on the bottom side is larger than the width of the opening on the joining surfaces.

[0007] According to the present disclosure, it is possible to provide a tubular member that can be easily installed and removed, a method for assembling a tubular member, a method for disassembling a tubular member, a liner, a stern tube seal system, and a ship.

[0008] FIG. 1 is a diagram showing an example of a schematic configuration of a stern tube seal system according to an embodiment; FIG. 2 is a perspective view of a liner according to an embodiment, viewed from the bow side; FIG. 3 is a perspective view of a liner according to an embodiment, viewed from the stern side; FIG. 4 is an exploded perspective view of a liner according to an embodiment, viewed from the stern side; FIG. 5 is a diagram showing a first stage of an assembly procedure for a liner according to an embodiment; FIG. 6 is a diagram showing a second stage of an assembly procedure for a liner according to an embodiment; FIG. 7 is a diagram showing a third stage of an assembly procedure for a liner according to an embodiment; FIG. 8 is a diagram showing a fourth stage of an assembly procedure for a liner according to an embodiment;

[0009] Hereinafter, embodiments will be described with reference to the accompanying drawings. To facilitate understanding of the description, the same components in the drawings will be denoted by the same reference numerals as much as possible, and duplicated descriptions will be omitted.

[0010] [Configuration of Stern Tube Seal System 200] First, a stern tube seal system 200 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of a schematic configuration of the stern tube seal system 200 according to an embodiment.

[0011] As shown in Fig. 1, the stern tube seal system 200 is mounted on a ship 300. The stern tube seal system 200 has a stern tube seal device 10 around the propeller shaft 3 of the ship 300, and further mainly has an air control unit 30, an oil tank unit 60, an oil pump unit 70, and a drain recovery unit 80 inside the ship 300.

[0012] A bearing 2 is provided inside the stern tube 1, and a propeller shaft 3 is rotatably supported via the bearing 2, and a boss portion 5A of a propeller 5 is fixed to the tip of the propeller shaft 3 on the stern side. As a result, when the propeller shaft 3 is driven to rotate, the driving force is transmitted to the propeller 5 via the boss portion 5A, causing the propeller 5 to rotate.

[0013] A liner 4 is fitted around the propeller shaft 3. The liner 4 has a tubular portion 4A and a flange portion 4B. The tubular portion 4A is a cylindrical portion that abuts against the outer circumferential surface of the propeller shaft 3. The inner diameter of the tubular portion 4A is approximately the same as the diameter of the propeller shaft 3. The flange portion 4B is provided at the aft end of the tubular portion 4A and is an annular portion that extends radially outward from the tubular portion 4A. The flange portion 4B is formed to face the bow end surface of the boss portion 5A of the propeller 5 and is connected and fixed to this end surface by any means, such as bolt fastening. This allows the liner 4 to rotate integrally with the propeller shaft 3 and the propeller 5.

[0014] A cylindrical housing 7 is disposed on the outer periphery of the liner 4 so as to concentrically surround the liner 4, and the housing 7 is fixed to the stern tube 1 with bolts. The stern tube seal device 10 has the housing 7, a packing ring 8, and four seal rings 9 (in order from the stern side, a first seal ring 9A, a second seal ring 9B, a third seal ring 9C, and a fourth seal ring 9D).

[0015] The housing 7 is formed by six split housings 6, each of which is a cylindrical member that fits together and is fixed to the stern tube 1 in a stacked state in the axial direction of the propeller shaft 3. When each split housing 6 fits with an adjacent split housing 6, a seal ring 9 is held between the two split housings 6. The packing ring 8 is made of an annular elastic member and is fitted onto the outside of the liner 4. The packing ring 8 rotates together with the liner 4 and makes sliding contact with the housing 7, preventing foreign objects such as fishing nets from entering the stern tube seal device 10 and the stern tube 1.

[0016] Each seal ring 9 is installed by being fastened to the liner 4 side, with a lip portion formed at the end of the annular shape on the center side being in contact with the outer circumferential surface of the liner 4 .

[0017] The elastic member, seal ring 9, can be made from a rubber material or a resin material other than rubber. Examples of rubber materials include nitrile rubber (NBR), fluororubber (FR), natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), and styrene-butadiene rubber (SBR). Examples of resin materials other than rubber include polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), fluororesin, and polyamide (PA).

[0018] The first seal ring 9A and the second seal ring 9B are disposed with their lips facing the stern, while the third seal ring 9C and the fourth seal ring 9D are disposed with their lips facing the bow. An annular chamber is formed between adjacent seal rings 9, 9, and, from the stern side, a first air chamber 20A, a second air chamber 20B (both are examples of air chambers), and a first oil chamber 20C (an example of an oil chamber) are formed. In addition to the illustrated example, a stern tube seal device having three seal rings 9 may also be used. In this configuration, the first seal ring from the stern side is disposed with its lip facing the stern, and the second and third seal rings are disposed with their lips facing the bow.

[0019] An air supply path 51 extending from the air control unit 30 is connected to the second air chamber 20B, and air provided from the air source 38 is supplied to the second air chamber 20B via the air control unit 30 and the air supply path 51. The supplied air then pushes up the lips of the second seal ring 9B and the first seal ring 9A in turn, discharging the air into the seawater.

[0020] On the other hand, an oil supply passage 56 is connected to the first oil chamber 20C, and lubricating oil supplied from the oil tank unit 60 is supplied to the oil pump unit 70 via the oil supply passage 55, and lubricating oil is supplied from the oil pump unit 70 to the first oil chamber 20C via the oil supply passage 56.

[0021] The oil supply passage 56 branches on the secondary side of the oil pump unit 70, and lubricating oil is supplied to the first oil chamber 20C via one oil supply passage 56, and to the third oil chamber 20E via the other oil supply passage 56. This lubricating oil improves the sliding of the bearing 2. The lubricating oil provided to the third oil chamber 20E is supplied to the second oil chamber 20D, which is an annular chamber formed between the fourth seal ring 9D and the bearing 2 on the stern side of the bearing 2. An oil return passage 54 communicates with the third oil chamber 20E, and the lubricating oil is recovered to the oil tank unit 60 via the oil return passage 54.

[0022] The air control unit 30 is connected to the second air chamber 20B via an air supply path 51 and controls the pressure and flow rate of air (compressed air) supplied from the air source 38 to the second air chamber 20B. The air control unit 30 is also connected to an oil tank 61 that constitutes an oil tank unit 60 via a pressurization path 52 and controls the chamber pressure of the oil tank 61. The air control unit 30 is connected to a terminal device 100 such as a tablet so as to be able to communicate with the terminal device 100 via a wired or wireless connection, and operation and parameter adjustments are performed by a management application built into the terminal device 100. A detailed description of the configuration of the air control unit 30 will be omitted. The air control unit 30 may be configured to be solely mechanical, without being connected to the terminal device 100 such as a tablet.

[0023] The oil tank unit 60 includes an oil tank 61 and a valve 62 that is normally open and is located midway through the oil return path 54. The oil tank 61 is pressurized using the air pressure provided to the oil tank 61 via the pressurization path 52, thereby controlling the oil pressure of the lubricating oil in the first oil chamber 20C to the third oil chamber 20E to be constantly higher than the seawater pressure and the air chamber pressure of the first air chamber 20A and the second air chamber 20B. Because the oil chamber pressure of the first oil chamber 20C is controlled to be constantly higher than the air chamber pressure of the second air chamber 20B by a constant pressure, and because the lip of the third seal ring 9C faces the bow, the lubricating oil in the first oil chamber 20C can constantly press the lip of the third seal ring 9C against the liner 4. This constantly keeps the lip of the third seal ring 9C in sliding contact with the liner 4, preventing leakage of lubricating oil from the first oil chamber 20C to the second air chamber 20B.

[0024] The oil pump unit 70 includes, in order from the oil tank 61 side, a filter 71, a circulation pump 72, a cooler 73, and a valve 74 that is normally open at the position where the oil supply passage 56 extending from the cooler 73 branches off. 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, and also supplies the lubricating oil to the second oil chamber 20D via the sliding surfaces between the liner 4 and the third seal ring 9C and the fourth seal ring 9D. The lubricating oil is then returned from the third oil chamber 20E to the oil tank unit 60 via the oil return passage 54, thereby constantly circulating the lubricating oil.

[0025] The drain recovery unit 80 has a drain path 57 leading to the second air chamber 20B, and a valve 83 that is normally open midway along the drain path 57, in order to discharge seawater or lubricating oil when these fluids enter the second air chamber 20B. The drain recovery unit 80 also has a drain discharger 81 (auto-drain) and a needle valve 82, and seawater, lubricating oil, etc. are collected in the drain discharger 81 and automatically discharged when a certain amount has accumulated.

[0026] Under normal circumstances, only air is released from the second air chamber 20B by the drain recovery unit 80. However, in the unlikely event that seawater or lubricating oil leaks into the second air chamber 20B, a small amount of pressurized air is released via the needle valve 82, which is always open, and the leaked seawater or lubricating oil is collected by the drain recovery unit 80.

[0027] [Configuration of the liner 4] Next, the configuration of the liner 4 according to the embodiment will be described with reference to Fig. 2 to Fig. 4. Fig. 2 is a perspective view of the liner 4 according to the embodiment as seen from the stern side. Fig. 3 is a perspective view of the liner 4 according to the embodiment as seen from the bow side. Fig. 4 is an exploded perspective view of the liner 4 according to the embodiment as seen from the stern side.

[0028] In the following description, the X, Y, and Z directions are perpendicular to one another. 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, with the positive X direction side being the stern side and the negative X direction side being the bow side. The X direction is also the axial direction of the propeller shaft 3. The Y direction is the width direction of the ship 300. For ease of explanation, the positive Z direction may also be referred to as the upper side and the negative Z direction may also be referred to as the lower side.

[0029] As shown in Figures 2 and 3, the liner 4 is a cylindrical member. The liner 4 has a tubular portion 4A and a flange portion 4B. The flange portion 4B is provided at the end of the tubular portion 4A on the positive X-direction side (stern side). A plurality of through holes 4C are provided in the flange portion 4B. Each of the plurality of through holes 4C is formed by penetrating the flange portion 4B in the X-direction and is arranged at approximately equal intervals around the circumference of the annular shape of the flange portion 4B.

[0030] The end face of flange portion 4B on the X-positive side is formed flush with the end face of cylindrical portion 4A on the X-positive side. That is, liner 4 has a flat end face 4D on the X-positive side (stern side). With end face 4D abutting against the end face on the bow side (X-negative side) of boss portion 5A of propeller 5 (see FIG. 1 ), liner 4 is fixed to propeller 5 so as to be rotatable integrally with propeller 5 by inserting fastening elements such as bolts into the multiple through holes 4C from the X-negative side and fastening them to boss portion 5A.

[0031] The liner 4 also has a flat end surface 4E on the negative X side (bow side). The end surface 4E is the end surface of the cylindrical portion 4A.

[0032] As shown in FIGS. 2 to 4 , the liner 4 is a split cylindrical body configured by combining two parts split along the axial direction (X direction) of the propeller shaft 3 in the circumferential direction around the propeller shaft 3. For example, as shown in FIGS. 2 to 4 , the liner 4 has a first segment 41 and a second segment 42, each of which is a cylindrical shape split along the Y direction at the center position in the Z direction. The first segment 41 is a semi-cylindrical member that opens on the Z negative side, and the second segment 42 is a semi-cylindrical member that opens on the Z positive side. The first segment 41 is located on the Z positive side, and the second segment 42 is located on the Z negative side. The first segment 41 and the second segment 42 correspond to the "two parts" that make up the split cylindrical body of the liner 4.

[0033] 4, the first divided body 41 has a first bonding surface 411 and a second bonding surface 412 as end surfaces on the Z negative side. The first bonding surface 411 is an end surface located on the Y positive side with respect to the central axis of the liner 4, and the second bonding surface 412 is an end surface located on the Y negative side.

[0034] A first groove 413 is provided in the first bonding surface 411. The first groove 413 is recessed from the first bonding surface 411 toward the Z positive direction and extends along the axial direction (X direction). The first groove 413 has an opening 413A and a widened portion 413B. The opening 413A is a portion that opens onto the first bonding surface 411 and includes the opening of the first groove 413. The widened portion 413B is a portion on the Z positive direction side of the opening 413A and includes the bottom surface of the first groove 413. The widened portion 413B is formed to extend on both sides of the opening 413A in the Y direction, and therefore has a larger dimension in the Y direction than the opening 413A.

[0035] A second groove 414 is provided in the second bonding surface 412. The second groove 414 is recessed from the second bonding surface 412 toward the Z positive direction and extends along the axial direction (X direction). The second groove 414 has an opening 414A and a widened portion 414B. The opening 414A is a portion that opens onto the second bonding surface 412 and includes the opening of the second groove 414. The widened portion 414B is a portion on the Z positive direction side of the opening 414A and includes the bottom surface of the second groove 414. The widened portion 414B is formed to extend on both sides of the opening 414A in the Y direction, and therefore has a larger dimension in the Y direction than the opening 414A.

[0036] The first groove 413 and the second groove 414 of the first divided body 41 have cross-sectional shapes in a cross section perpendicular to the axial direction (X direction) such that the width on the bottom side (i.e., the width dimension in the Y direction of the widened portions 413B, 414B) is larger than the width of the openings (i.e., the width dimension in the Y direction of the openings 413A, 414A) on the first bonding surface 411 and the second bonding surface 412. In this embodiment, the first groove 413 and the second groove 414 have a T-shaped cross-section.

[0037] 4, the second divided body 42 has a first bonding surface 421 and a second bonding surface 422 as end surfaces on the Z positive side. The first bonding surface 421 is an end surface located on the Y positive side with respect to the central axis of the liner 4, and the second bonding surface 422 is an end surface located on the Y negative side.

[0038] A first groove 423 is provided in the first bonding surface 421. The first groove 423 is recessed from the first bonding 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 widened portion 423B. The opening 423A is a portion that opens onto the first bonding surface 421 and includes the opening of the first groove 423. The widened portion 423B is a portion on the negative Z direction side of the opening 423A and includes the bottom surface of the first groove 423. The widened portion 423B is formed to extend on both sides of the opening 423A in the Y direction, and therefore has a larger dimension in the Y direction than the opening 423A.

[0039] A second groove 424 is provided in the second bonding surface 422. The second groove 424 is recessed from the second bonding surface 422 toward the negative Z direction and extends along the axial direction (X direction). The second groove 424 has an opening 424A and a widened portion 424B. The opening 424A is a portion that opens onto the second bonding surface 422 and includes the opening of the second groove 424. The widened portion 424B is a portion on the positive Z direction side of the opening 424A and includes the bottom surface of the second groove 424. The widened portion 424B is formed to extend on both sides of the opening 424A in the Y direction, and therefore has a larger dimension in the Y direction than the opening 424A.

[0040] The first groove 423 and the second groove 424 of the second divided body 42 have cross-sectional shapes in a cross section perpendicular to the axial direction (X direction) that are formed such that the width on the bottom surface side (i.e., the width dimension in the Y direction of the widened portions 423B, 424B) is larger than the width of the openings (i.e., the width dimension in the Y direction of the openings 423A, 424A) on the first bonding surface 421 and the second bonding surface 422. In this embodiment, the first groove 423 and the second groove 424 have a T-shaped cross-section.

[0041] When the first division 41 and the second division 42 are joined, the first joining surface 411 of the first division 41 and the first joining surface 421 of the second division 42 face each other and abut against each other along the circumferential direction of the tubular portion 4A. Furthermore, because the thicknesses of the tubular portions of the first division 41 and the second division 42 are formed with the same dimensions, the first joining surface 411 of the first division 41 and the first joining surface 421 of the second division 42 are formed with the same shape. As a result, the first joining surfaces 411, 421 abut against each other with their outer shapes completely overlapping.

[0042] Furthermore, the first groove 413 provided in the first joining surface 411 of the first divider 41 and the first groove 423 provided in the first joining surface 421 of the second divider 42 are formed so that their openings are at the same position in the Y direction. As a result, as shown in Figures 2 and 3 , when the first joining surface 411 of the first divider 41 and the first joining surface 421 of the second divider 42 abut against each other, the openings of the two first grooves 413, 423 on the joining surfaces are connected to form a first through hole 49 whose axial direction is the axial direction (X direction) of the liner 4. In this embodiment, the cross-sectional shapes of the first grooves 413, 423 in a cross section perpendicular to the axial direction (X direction) are both T-shaped, and therefore the cross-sectional shape of the first through hole 49 is formed to be H-shaped.

[0043] Similarly, when the first division 41 and the second division 42 are joined, the second joining surface 412 of the first division 41 and the second joining surface 422 of the second division 42 face each other and abut against each other along the circumferential direction of the tubular portion 4A. Furthermore, because the thicknesses of the tubular portions of the first division 41 and the second division 42 are formed with the same dimensions, the second joining surface 412 of the first division 41 and the second joining surface 422 of the second division 42 are formed with the same shape. As a result, the second joining surfaces 412, 422 abut against each other with their outer shapes completely overlapping.

[0044] Furthermore, the second groove 414 provided in the second joining surface 412 of the first divider 41 and the second groove 424 provided in the second joining surface 422 of the second divider 42 are formed so that their openings are at the same position in the Y direction. As a result, as shown in Figures 2 and 3 , when the second joining surface 412 of the first divider 41 and the second joining surface 422 of the second divider 42 abut against each other, the openings of the two second grooves 414, 424 on the joining surfaces are connected to form a second through hole 50 whose axial direction is the axial direction (X direction) of the liner 4. In this embodiment, the cross-sectional shapes of the second grooves 414, 424 in a cross section perpendicular to the axial direction (X direction) are both T-shaped, and therefore the cross-sectional shape of the second through hole 50 is formed to be H-shaped.

[0045] As shown in FIG. 4 , the first joint surface 411 of the first divided body 41 has a pin insertion hole 417 recessed from the joint surface toward the positive Z direction. Meanwhile, the first joint surface 421 of the second divided body 42 also has a pin insertion hole 427 recessed from the joint surface toward the negative Z direction. The two pin insertion holes 417, 427 are formed so that their openings are aligned in the X and Y directions. As a result, when the first joint surface 411 of the first divided body 41 and the first joint surface 421 of the second divided body 42 abut against each other, the two pin insertion holes 417, 427 are linearly connected to each other in the Z direction. A single pin 47 is inserted into these two pin insertion holes 417, 427. It is preferable that the cross-sectional shape of the pin 47 be substantially the same as that of the pin insertion holes 417, 427.

[0046] Similarly, a pin insertion hole 418 is provided in the second joint surface 412 of the first divided body 41, recessed from the joint surface toward the positive Z direction. Meanwhile, a pin insertion hole 428 is provided in the second joint surface 422 of the second divided body 42, recessed from the joint surface toward the negative Z direction. The two pin insertion holes 418, 428 are formed so that their openings are aligned in the X and Y directions. As a result, when the second joint surface 412 of the first divided body 41 and the second joint surface 422 of the second divided body 42 abut against each other, the two pin insertion holes 418, 428 are linearly connected to each other in the Z direction. A single pin 48 is inserted into these two pin insertion holes 418, 428. It is preferable that the cross-sectional shape of the pin 48 be substantially the same as that of the pin insertion holes 418, 428.

[0047] By using two pins 47, 48 in this manner, the relative positional relationship between the first divided body 41 and the second divided body 42 in the X and Y directions can be constant, ensuring that the first joining surfaces 411, 421 are abutted together so as to completely overlap. This also ensures that the openings of the first grooves 413, 423 are positioned so as to completely overlap, allowing the first through hole 49 to be neatly formed on the joining surfaces without any misalignment in the Y direction. Similarly, it also ensures that the openings of the second grooves 414, 424 are positioned so as to completely overlap, allowing the second through hole 50 to be neatly formed on the joining surfaces without any misalignment in the Y direction.

[0048] As shown in FIG. 4 , the portion of the first divider 41 corresponding to the flange 4B has a notch 415 recessed from the annular outer surface toward the Y-positive side at the end on the Y-negative side. The notch 415 is formed so that the portion of the first divider 41 corresponding to the flange 4B extends from the second joint surface 412 to a predetermined height position on the Z-positive side. In other words, a protruding portion extending from the center of the first divider 41 in the Y-negative direction is left on the Z-negative side of the notch 415. A bolt insertion hole 416 is formed in this protruding portion and penetrates in the Z-direction. Meanwhile, a bolt screw hole 430 recessed in the Z-negative direction and having an internal thread groove cut into the inner circumferential surface is formed in the second joint surface 412 of the second divider 42 at a position overlapping the bolt insertion hole 416. When the first partition 41 and the second partition 42 are joined, a bolt 45 is inserted into the bolt insertion hole 416 from the positive Z direction side and screwed into the bolt screwing hole 430, thereby connecting and fixing the second joint surface 412 of the first partition 41 and the second joint surface 422 of the second partition 42 in an abutting state.

[0049] Similarly, a cutout 425 recessed from the annular outer peripheral surface toward the Y-negative side is provided at the Y-positive end of the portion of the second divider 42 corresponding to the flange 4B. The cutout 425 is formed so that the portion of the second divider 42 corresponding to the flange 4B extends from the first joint surface 421 to a predetermined height position toward the Z-negative side. In other words, a protruding portion extending from the center of the second divider 42 in the Y-positive direction is left on the Z-positive side of the cutout 425. A bolt insertion hole 426 is provided in this protruding portion, penetrating the first divider 42 in the Z-direction. Meanwhile, a bolt screw hole 420 recessed in the Z-negative direction and having an internal thread groove cut into the inner peripheral surface is provided on the first joint surface 411 of the first divider 41 at a position overlapping the bolt insertion hole 426. When the first partition 41 and the second partition 42 are joined, a bolt 46 is inserted into the bolt insertion hole 426 from the negative Z direction side and screwed into the bolt screwing hole 420, thereby connecting and fixing the first joint surface 411 of the first partition 41 and the first joint surface 421 of the second partition 42 in an abutting state.

[0050] Furthermore, by configuring the bolt 45 to be fastened from the first partition 41 side and the bolt 46 to be fastened from the second partition 42 side, the two bolts 45, 46 are fastened in opposite directions in the Z direction and at positions equidistant in the Y direction from the axial center position of the liner 4, thereby enabling the first partition 41 and the second partition 42 to be connected and fixed in a balanced manner.

[0051] As shown in Fig. 4, the liner 4 further includes a first bar group 43 and a second bar group 44. As shown in Figs. 2 and 3, the first bar group 43 is formed to extend along the axial direction of the first through hole 49 and is an element that is inserted into the first through hole 49 to join the first divided body 41 and the second divided body 42. The second bar group 44 is formed to extend along the axial direction of the second through hole 50 and is an element that is inserted into the second through hole 50 to join the first divided body 41 and the second divided body 42.

[0052] 4, the first bar group 43 has a pair of first members 431, 432 and a second member 433. One of the first members 431 is inserted into the end of the first through hole 49 on the stern side (X positive direction side). The other first member 432 is inserted into the end of the first through hole 49 on the bow side (X negative direction side). The second member 433 is inserted into the first through hole 49 at a midpoint between the first member 431 on the stern side and the first member 432 on the bow side.

[0053] The pair of first members 431, 432 have cross-sectional shapes that are the same as the first through hole 49. In the present embodiment, since the cross-sectional shape of the first through hole 49 is H-shaped, the cross-sectional shapes of the first members 431, 432 are also H-shaped like the first through hole 49. That is, one of the first members 431 has a first flat plate portion 431A that has the same shape as the widened portion 413B of the first groove 413 of the first divided body 41 and extends in the Y direction, a second flat plate portion 431B that has the same shape as the widened portion 423A of the first groove 423 of the second divided body 42 and extends in the Y direction, and a connecting portion 431C that has the same shape as the opening 413A of the first groove 413 and the opening 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 member 432 has a first flat plate portion 432A that has the same shape as the widened portion 413B of the first groove 413 of the first divider 41 and extends in the Y direction, a second flat plate portion 432B that has the same shape as the widened portion 423A of the first groove 423 of the second divider 42 and extends in the Y direction, and a connecting portion 432C that has the same shape as the opening 413A of the first groove 413 and the opening 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. Furthermore, the outer shape of the pair of first members 431, 432 is formed slightly smaller than the shape of the inner circumferential surface of the first through hole 49 so that they can be inserted into the first through hole 49.

[0054] The second member 433 has a cross-sectional shape that is the same as the first groove 413 of the first divided body 41, and has a base end 433A that is inserted into the first groove 413, and a tip end 433B that can enter the inside of the first groove 423 (widened portion 423B) of the groove from the opening (opening 423A) of the first groove 423 of the second divided body 42. In this embodiment, the cross-sectional shape of the second member 433 is T-shaped.

[0055] 4, the second bar group 44 has a pair of first members 441, 442 and a second member 443. One of the first members 441 is inserted into the end of the second through hole 50 on the stern side (X positive direction side). The other first member 442 is inserted into the end of the second through hole 50 on the bow side (X negative direction side). The second member 443 is inserted into the second through hole 50 at a midpoint between the first member 441 on the stern side and the first member 442 on the bow side.

[0056] The pair of first members 441, 442 have the same cross-sectional shape as the second through hole 50. In the present embodiment, since the cross-sectional shape of the second through hole 50 is H-shaped, the cross-sectional shapes of the first members 441, 442 are also H-shaped like the second through hole 50. That is, one of the first members 441 has a first flat plate portion 441A that has the same shape as the widened portion 414B of the second groove 414 of the first divided body 41 and extends in the Y direction, a second flat plate portion 441B that has the same shape as the widened portion 424B of the second groove 424 of the second divided body 42 and extends in the Y direction, and a connecting portion 441C that has the same shape as the opening 414A of the second groove 414 and the opening 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, the other first member 442 has a first flat plate portion 442A that extends in the Y direction and has the same shape as the widened portion 414B of the second groove 414 of the first divider 41, a second flat plate portion 442B that extends in the Y direction and has the same shape as the widened portion 424B of the second groove 424 of the second divider 42, and a connecting portion 442C that extends in the Z direction and has the same shape as the opening 414A of the second groove 414 and the opening 424A of the second groove 424. The outer shape of the pair of first members 441, 442 is formed slightly smaller than the shape of the inner circumferential surface of the second through hole 50 so that they can be inserted into the second through hole 50.

[0057] The second member 443 has a cross-sectional shape that is the same as the second groove 424 of the second divided body 42, and has a base end 443A that is inserted into the second groove 424, and a tip end 443B that can enter the inside of the second groove 414 (widened portion 414B) from the opening (opening 414A) of this groove in the first divided body 41. In this embodiment, the cross-sectional shape of the second member 443 is T-shaped.

[0058] In this embodiment, the first groove 413 and the second groove 414 provided in the first divided body 41, and the first groove 423 and the second groove 424 provided in the second divided body 42 can be formed using a well-known machining method such as wire electric discharge machining.

[0059] The first divided body 41, the second divided body 42, the first bar group 43, and the second bar group 44 that constitute the liner 4 according to this embodiment can be formed using, for example, a stainless steel-based material.

[0060] The liner 4 as an example of a cylindrical member according to the present embodiment includes a split cylindrical body configured by combining two parts (a first segment 41 and a second segment 42) split along the axial direction of the propeller shaft 3 in a circumferential direction around the propeller shaft 3, and two joint surfaces (a first joint surface 411 of the first segment 41 and a first joint surface 421 of the second segment 42, and a second joint surface 412 of the first segment 41 and a second joint surface 422 of the second segment 42) that are circumferentially opposed and in contact with each other, which are provided along the axial direction, and when the two joint surfaces come into contact with each other, The component has a pair of grooves (first groove 413 of first divided body 41 and first groove 423 of second divided body 42, and second groove 414 of first divided body 41 and second groove 424 of second divided body 42) that connect the upper openings to form through holes (first through hole 49 and second through hole 50) with the axial direction as the axial direction, and bars (first bar group 43, second bar group 44) that are formed to extend along the axial direction and are inserted into through holes 49, 50 to join two parts. The cross-sectional shape of each groove in a cross section perpendicular to the axial direction is formed so that the width on the bottom surface is larger than the width of the opening on the joining surface.

[0061] With this configuration, the first division 41 and the second division 42 can be firmly joined together simply by inserting a rod into the through hole formed by the pair of grooves when the joining surfaces of the first division 41 and the second division 42 are abutted against each other, facilitating the installation of a tubular member such as the liner 4. Similarly, the first division 41 and the second division 42 can be easily separated simply by pulling out the rod inserted in the through hole from the through hole, facilitating the removal of a tubular member such as the liner 4.

[0062] In particular, when the cylindrical member according to the embodiment is applied to a liner 4, the liner 4 must be replaced in the stern tube seal system 200 in which the liner 4 is installed. However, in the case of a conventional liner that is integrally molded into a cylindrical shape, replacing the liner requires the propeller 5 to be removed from the propeller shaft 3, and then the liner must be pulled out from the propeller shaft 3, which is extremely time-consuming. In response to this conventional problem, the present embodiment can apply a liner 4 that has a split cylindrical body, so that by disassembling the liner 4, the liner 4 can be removed from the propeller shaft 3 without removing the propeller 5 from the propeller shaft 3. This reduces the burden of the liner 4 replacement work.

[0063] Furthermore, because the grooves forming the through holes 49 and 50 are shaped so that their bottom widths are larger than their opening widths, the cross-sectional shape of each through hole 49 and 50 has its narrowest Y-direction width at the contact point between the joining surfaces at the center in the Z direction, and its widths are relatively larger at the Z-positive and Z-negative sides of the contact point. The same applies to the cross-sectional shape of each bar inserted into the through holes 49 and 50. By using such through holes and bar members, the inner surfaces of each groove forming the through hole can be abutted against the side surfaces of the bar member inserted into the groove, preventing the grooves from slipping out of the bar member in the Z direction. As a result, unexpected separation between the first and second segments 41 and 42 can be prevented even when an external force is applied. Furthermore, because the grooves are prevented from moving in the Y direction relative to the bar member, misalignment in the Y direction between the first and second segments 41 and 42 can also be prevented. This allows for a more stable joining of the first and second segments 41 and 42.

[0064] In this embodiment, the joining structure between the first and second segments 41 and 42 is configured such that a rod extending along the axial direction is inserted into a through-hole provided along the axial direction of the split tubular body formed by joining the first and second segments 41 and 42. This configuration allows the rod to be interposed throughout the axial direction in the region where the joining surfaces of the first and second segments 41 and 42 abut, thereby preventing leakage of liquid or gas at the joint portion of the split tubular body. Furthermore, with this configuration, each element of the joining structure can be disposed inside the member forming the tubular shape. This prevents the elements of the joining structure from being exposed to the outside of the tubular member after the split tubular body is joined, thereby preventing deterioration of each element and extending the life of the tubular member.

[0065] Furthermore, the joining structure between the first segment 41 and the second segment 42 requires only a pair of grooves formed on the joining surfaces and a rod inserted into the through-hole formed by these grooves. This means that the joining structure can be contained within the width of the joining surfaces. Therefore, even for a liner 4 having a split tubular body, the wall thickness of the tubular portion 4A can be made similarly thin to that of a liner that is integrally molded into a cylindrical shape. This allows for a reduction in the weight of tubular members, such as the liner 4 having a split tubular body. Furthermore, since there is no need to provide joining elements, such as bolt fastening portions, on the outer periphery of the tubular portion 4A, the tubular member can also be made more compact. These benefits of reduced weight and size allow for a wider range of applications for tubular members, improving their versatility.

[0066] Furthermore, in the liner 4 as an example of a cylindrical member according to the present embodiment, a first rod group 43 as an example of rods includes a pair of first members 431, 432 inserted into both axial ends of the through hole 49, and a second member 433 inserted into the through hole 49 at an intermediate position between the pair of first members 431, 432 when the pair of first members 431, 432 are inserted into both ends of the through hole 49. The pair of first members 431, 432 have the same cross-sectional shape in a cross section perpendicular to the axial direction as the through hole 49. The second member 433 has a base end 433A whose cross-sectional shape is the same as that of one of the pair of grooves, and a tip end 433B that can enter the other of the pair of grooves from the opening of the other groove.

[0067] Similarly, in the liner 4 as an example of a tubular member according to the present embodiment, the second group of rods 44 as an example of rods includes a pair of first members 441, 442 inserted into both axial ends of the through hole 50, and a second member 443 inserted into the through hole 50 at an intermediate position between the pair of first members 441, 442 when the pair of first members 441, 442 are inserted into both ends of the through hole 50. The pair of first members 441, 442 have the same cross-sectional shape in a cross section perpendicular to the axial direction as the through hole 50. The second member 443 has a base end 443A whose cross-sectional shape is the same as that of one of the pair of grooves, and a tip end 443B that can enter the other of the pair of grooves from the opening of the other groove.

[0068] With these configurations, the engagement areas between the through holes 49, 50 and the rod material can be limited to the areas where the first members 431, 441 on the stern side and the first members 432, 442 on the bow side are inserted at both ends of the hole, making the assembly and disassembly of the liner 4 easier and improving work efficiency.

[0069] [Methods of Assembling and Disassembling the Liner 4] A method of assembling the liner 4 will be described with reference to FIGS.

[0070] FIG. 5 illustrates a first stage of the assembly procedure for the liner 4 according to the embodiment. As shown in FIG. 5 , in the first stage (insertion step), the base end 433A of the second member 433 of the first rod group 43 is inserted into the first groove 413 of the first partition 41. Similarly, the base end 443A of the second member 443 of the second rod group 44 is inserted into the second groove 424 of the second partition 42. Also, in the first stage, a sealant is applied to the second groove 414 of the first partition 41 and the first groove 423 of the second partition 42. The sealant may also be applied to the second members 433 and 443 that are inserted into the grooves 413 and 424. Also, a pin 47 is inserted into the pin insertion hole 417 of the first partition 41, and a pin 48 is inserted into the pin insertion hole 428 of the second partition 42.

[0071] 6 is a diagram showing a second stage of the assembly procedure for the liner 4 according to the embodiment. As shown in FIG. 6 , in the second stage (abutment step), the tip portion 433B of the second member 433 protruding 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, and the tip portion 443B of the second member 443 protruding 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 abuts the first joining surfaces 411 and 421 of the first segment 41 and the second joining surfaces 412 and 422 of the second segment 42 constituting the segmented cylindrical body. At this time, since the sealant was applied in the first stage, the sealant fills the gaps in the grooves 423 and 414 where the tip portions 433B and 443B of the second members are inserted. In the second stage, a pin 47 is inserted into the pin insertion hole 427 of the second divided body 42, and a pin 48 is inserted into the pin insertion hole 418 of the first divided body 41, thereby positioning the first divided body 41 and the second divided body 42 in a constant relative positional relationship by the two pins 47 and 48.

[0072] 7 is a diagram showing a third stage of the assembly procedure for the liner 4 according to the embodiment. As shown in FIG. 7 , in the third stage (insertion step), one first member 431 of the first bar group 43 is inserted through the opening on the aft end face 4D of the liner 4, among the openings on both axial 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 after the second stage. Similarly, one first member 441 of the second bar group 44 is inserted through the opening on the aft end face 4D of the liner 4, among the openings on both axial 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 after the second stage. In the third stage, the bolt 45 is inserted into the bolt insertion hole 416 of the first partition 41 and screwed into the bolt screwing hole 430 of the second partition 42, and the bolt 46 is inserted into the bolt insertion hole 426 of the second partition 42 and screwed into the bolt screwing hole 420 of the first partition 41.

[0073] 8 is a diagram showing a fourth stage of the assembly procedure for the liner 4 according to the embodiment. As shown in Fig. 8 , in the fourth stage (insertion step), the other first member 432 of the first bar group 43 is inserted from the opening at both axial ends of the first through hole 49 that is closer to the bow end face 4E of the liner 4. Similarly, the other first member 442 of the second bar group 44 is inserted from the opening at both axial ends of the second through hole 50 that is closer to the bow end face 4E of the liner 4.

[0074] The disassembly method of the liner 4 can be performed by reversing the assembly method. That is, the following steps are performed in order: a pulling-out step of pulling out the stern-side first members 431, 441 and the bow-side first members 432, 442 from the through-holes 49, 50; a separation step of separating one of the first segment 41 and the second segment 42 of the split tubular body, in which the base ends 433A, 443A of the second members 433, 443 are inserted into the grooves, from the other; and a removal step of removing the second members 433, 443 from the grooves 413, 424 after the separation step.

[0075] It should be noted that, for example, a situation may arise in which an ordering party who owns the vessel 300 orders only the liner 4 from the manufacturer, and the manufacturer delivers the temporarily assembled liner 4 to the customer. In this case, the ordering party disassembles the received temporarily assembled liner 4, and then assembles the liner 4 around the propeller shaft 3 of the vessel 300 that the ordering party owns, thereby completing the final assembly of the liner 4.

[0076] In such a situation, in the above-described assembly method, it is preferable that the axial lengths of the stern-side first members 431, 441 and the bow-side first members 432, 442 be formed so as to have protruding portions whose one ends protrude from the openings of the through holes 49, 50 when they are inserted into the through holes 49, 50 in the third and fourth stages (insertion steps) of the assembly procedure described with reference to Figures 7 and 8, thereby establishing a temporary assembled state. In this case, in the above-described disassembly method, in the extraction step, the protruding portions are grasped and an external force is applied, thereby extracting the stern-side first members 431, 441 and the bow-side first members 432, 442 from the through holes 49, 50. This simplifies the extraction work of the stern-side first members 431, 441 and the bow-side first members 432, 442, improving the efficiency of the disassembly work.

[0077] In such a situation, when assembling the liner 4, it is preferable to perform a process (removal step) after the fourth stage (insertion steps) of the assembly procedure described with reference to Figures 7 and 8, in which the stern-side first members 431, 441 and the bow-side first members 432, 442 are inserted into the through-holes 49, 50, to remove the protruding portions of each member so that the opening-side end faces of the stern-side first members 431, 441 and the bow-side first members 432, 442 are flush with the axial end faces of the split cylindrical body (i.e., the stern-side end faces 4D and 4E of the liner 4). This prevents parts of the first bar group 43 and the second bar group 44 from protruding from the end faces 4D and 4E of the liner 4 after assembly, thereby preventing the first bar group 43 and the second bar group 44 from being damaged or coming loose due to the application of external force, thereby extending the life of the liner 4.

[0078] 9 is a diagram showing an example of the rods 43A and 44A according to Modification 1. In the above embodiment, the first rod group 43 and the second rod group 44 are each divided into three members along the axial direction of the through holes 49 and 50, but they may be replaced with a single rod 43A or 44A extending along the axial direction.

[0079] In this case, as shown in Fig. 9, the cross sections of the bars 43A, 44A at each position in the axial direction all have an H-shape. Furthermore, it is preferable that the axial length L of each bar 43A, 44A is formed to be the same as the total length of each member in the above embodiment, for example, the total length L of one first member 431 and the other first member 432 and second member 433 of the first bar group 43 as shown in Fig. 9. The bars 43A, 44A are inserted through through holes 49, 50, respectively, to connect the first divided body 41 and the second divided body 42.

[0080] [Second Modification] Fig. 10 is a diagram showing an example of a second member 434 of a rod group according to a second modification. In the above embodiment, as shown in Fig. 4 and the like, a configuration has been exemplified in which the tip ends 433B, 443B of the second members 433, 443 are formed so as to have the same width in the extension direction along the Z direction in the cross-sectional shape, but this is not limiting as long as the tip ends 433B, 443B have a shape that allows them to be inserted into the grooves of the other.

[0081] For example, as in the second member 434 shown in Fig. 10, the distal end portion 434B may have a tapered shape in which the width decreases toward the distal end. The shape of the proximal end portion 434A of the second member 434 is similar to the proximal end portions 433A and 443A of the above embodiment.

[0082] [Third Modification] Figure 11 shows an example of the cross-sectional shape of the through hole 49A and the rod 435 according to the third modification. In the above embodiment, the cross-sectional shapes of the through holes 49, 50 and the stern-side first members 431, 441 and bow-side first members 432, 442 of the rod groups 43, 44 are all H-shaped. However, other shapes may be used. The key point is that the cross-sectional shape of each groove in a cross section perpendicular to the axial direction of the liner 4 may be formed such that the width of the bottom surface is larger than the width of the opening at the joining surface. For example, as shown in Figure 11 for the groove 419 of the first segment 41 and the groove 429 of the second segment 42, the width dimension in the Y direction may gradually increase from the opening to the bottom surface of the groove. In this case, the cross-sectional shape of the through hole 49A formed by the two grooves 419, 429 is narrowest at the openings at the joining surfaces 411, 421 and gradually widens in the vertical direction, forming an hourglass shape. In this case, the cross-sectional shape of the rod 435 is also hourglass-shaped, similar to the through-hole 49A.

[0083] The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples made by a person skilled in the art as appropriate are also included within the scope of the present disclosure as long as they comprise the features of the present disclosure. The elements of the above-described specific examples, as well as their arrangement, conditions, shape, etc., are not limited to those exemplified and can be modified as appropriate. The elements of the above-described specific examples can be combined in various ways as appropriate, as long as no technical contradictions arise.

[0084] In the above embodiment, the liner 4 installed around the propeller shaft 3 in the stern tube seal system 200 has been described as an example of a tubular member according to the embodiment, but the present invention can also be applied to elements other than the liner 4 as long as the tubular member has a similar structure to the liner 4.

[0085] Furthermore, the liner 4, which is exemplified in the above embodiment as an example of a tubular member, is configured to have a first divided body 41 and a second divided body 42, and the tubular shape is divided into two parts. However, the tubular member may be configured to have a divided tubular body formed by combining multiple parts divided along the axial direction of the tubular member in the circumferential direction of the tubular member, and may be configured to have three or more divided bodies joined together to form an integral tubular body.

[0086] In the above embodiment, the liner 4 is exemplified as an example of a tubular member. The first rod group 43 inserted into the through hole 49 includes one first member 431, the other first member 432, and the second member 433. In this configuration, the first member 431 is inserted into the aft end of the through hole 49, the other first member 432 is inserted into the bow end of the through hole 49, and the second member 433 is inserted at a central position between the pair of first members 431, 432. Alternatively, the aft first member 431 may not be inserted into the through hole 49. That is, the second member 433 may be inserted into the central position of the through hole 49, and the other first member 432 may be inserted into the bow end of the through hole 49. In other words, the first bar group 43 may be configured with two members: the other first member 432 inserted into the bow end of the through hole 49, and the second member 433 inserted into the center of the through hole 49. In this configuration, the stern end of the through hole 49 is hollow, and the first segment 41 and the second segment 42 are not connected by the first bar group 43. However, even in this configuration, the first segment 41 and the second segment 42 are fastened together by two bolts 45, 46 at the stern flange portion 4B, so that the segments 41, 42 can be connected sufficiently firmly even in the stern portion of the liner 4.

[0087] Similarly, in the liner 4 exemplified as an example of a tubular member in the above embodiment, the second rod group 44 inserted into the through hole 50 includes one first member 441 and the other first member 442 and second member 443. In this configuration, the first member 441 is inserted into the aft end of the through hole 50, the other first member 442 is inserted into the bow end of the through hole 50, and the second member 443 is inserted at a central position between the pair of first members 441, 442. Alternatively, the aft first member 441 may not be inserted into the through hole 50. That is, the second member 443 may be inserted into the central position of the through hole 50, and the other first member 442 may be inserted into the bow end of the through hole 50. In other words, the second bar group 44 may be configured with two members: the other first member 442 inserted into the bow-side end of the through hole 50, and the second member 443 inserted into the center of the through hole 50. In this configuration, the stern-side end of the through hole 50 is hollow, and the first segment 41 and the second segment 42 are not connected by the second bar group 44. However, even in this configuration, the first segment 41 and the second segment 42 are fastened together by two bolts 45, 46 at the stern-side flange portion 4B, so that the segments 41, 42 can be connected sufficiently firmly even in the stern-side portion of the liner 4.

[0088] Furthermore, the liner 4 used in the stern tube seal system 200 may have a tapered inner diameter portion on the aft side (X-positive side). In such a case, the portions of the first members 431, 441 inserted into the aft ends of the through holes 49, 50 that are exposed from the through holes 49, 50 must also be cut into the same tapered shape as the inner diameter portion. This requires complex measures in the assembly process of the liner 4. Therefore, if the first members 431, 441 are not inserted into the aft ends of the through holes 49, 50, it is not necessary to process the exposed portions of the first members 431, 441 from the through holes 49, 50 flush with the aft end face 4D of the liner 4 (X-positive side). This avoids the problem of complex work being required in the assembly process of the liner 4.

[0089] In a configuration in which the first members 431, 441 are not inserted, it is possible to take measures such as assembling the liner 4 by applying a sealant (liquid packing) to the first joining surfaces 411, 421 and the second joining surfaces 412, 422 of the first segment 41 and the second segment 42, or sandwiching a gasket (sheet packing) between the flange surface (stern-side end surface 4D) of the liner 4 and the boss portion 5A of the propeller 5. By taking these measures, even in a configuration in which the first members 431, 441 are not provided on the flange portion 4B side (stern side), it is possible to suppress leakage of liquid or gas at the joint portion of the split cylindrical body, as in the above embodiment.

[0090] Furthermore, even in the case of a cylindrical member other than the liner 4, if the divided bodies 41, 42 are connected at one of the ends of the through holes 49, 50 by an element other than a rod, such as bolt fastening, the first member may not be inserted into one end of the through holes 49, 50. With these configurations, similar to the above embodiment, it is possible to achieve effects such as facilitating the installation and removal of the cylindrical member, such as the liner 4, extending the life of the cylindrical member, and simplifying the assembly and disassembly of the cylindrical member, thereby improving work efficiency.

[0091] DESCRIPTION OF SYMBOLS 4 Liner (cylindrical member) 41 First segment (split cylindrical body) 411 First joint surface 412 Second joint surface 413 First groove 414 Second groove 42 Second segment (split cylindrical body) 421 First joint surface 422 Second joint surface 423 First groove 424 Second groove 43 First group of rods (rods) 44 Second group of rods (rods) 431, 432, 441, 442 First member 433, 443, 434 Second member 435 Rods 49 First through-hole 50 Second through-hole 1 Stern tube 3 Propeller shaft 5 Propeller 10 Stern tube sealing device 200 Stern tube sealing system 300 Ship

Claims

1. A cylindrical member comprising: a split cylindrical body constructed by combining, in the circumferential direction, a plurality of parts that are split along the axial direction; a pair of grooves that are provided along the axial direction on two adjacent joining surfaces of the plurality of parts that face each other in the circumferential direction and are in contact with each other, and that form a through hole whose axial direction is the axis direction by connecting openings on the joining surfaces when the two joining surfaces abut; and a rod that is formed to extend along the axial direction and is inserted into the through hole to join the two parts, wherein the cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed so that the width on the bottom side is larger than the width of the opening on the joining surfaces.

2. The tubular member according to claim 1, wherein the rod material comprises: 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 an intermediate position between the pair of first members when the pair of first members are inserted into both ends of the through hole, wherein the first member has a cross-sectional shape in the cross section that is the same as that of the through hole, and the second member has a base end whose cross-sectional shape in the cross section is the same as that of one of the pair of grooves, and a tip end that can enter the other of the pair of grooves from the opening of the other groove.

3. A cylindrical member according to claim 1 or 2, wherein the groove is formed so that its cross section has a T-shape, and the through hole formed by combining the pair of grooves has an H-shape in cross section.

4. A split cylindrical body constructed by combining a plurality of parts split along the axial direction in the circumferential direction; a pair of grooves provided along the axial direction on two adjacent joining surfaces of the plurality of parts that face each other in the circumferential direction and are in contact with each other, the pair of grooves connecting openings on the joining surfaces when the two joining surfaces abut, thereby forming a through hole whose axial direction is the axial direction; and a rod material formed to extend along the axial direction and inserted into the through hole to join the two parts, wherein the cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed so that the width on the bottom side is larger than the width of the opening on the joining surfaces, and the rod material comprises: 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 midpoint between the pair of first members when the pair of first members are inserted into both ends of the through hole, wherein the cross-sectional shape of the first member in the cross section is the same as the shape of the through hole, a first member having a first opening and a second opening, the first member having a first cross-sectional shape in the cross section being the same as that of one of the pair of grooves, and a first end capable of entering the other of the pair of grooves through the opening, the first member including: an insertion step of inserting the first member into one of the pair of grooves; an abutting step of abutting the joining surfaces of the two parts of the split cylindrical body against each other by inserting the first member, the first member protruding from the opening of one of the grooves after the insertion step, into the opening of the other of the pair of grooves; and an insertion step of inserting the first member into at least one of the openings at both axial ends of the through hole formed by the pair of grooves after the abutting step.

5. A method for assembling a tubular member as described in claim 4, comprising: the axial length of the first member is formed so as to have a protruding portion whose one end protrudes from the opening of the through hole when inserted into the through hole in the insertion step; and a cutting step of cutting off the protruding portion after inserting the first member into the through hole in the insertion step, so that the end face of the first member on the opening side is flush with the axial end face of the split tubular body.

6. A split cylindrical body constructed by combining a plurality of parts split along the axial direction in the circumferential direction; a pair of grooves provided along the axial direction on two adjacent joining surfaces of the plurality of parts that face each other in the circumferential direction and are in contact with each other, the pair of grooves connecting openings on the joining surfaces when the two joining surfaces abut, thereby forming a through hole whose axial direction is the axial direction; and a rod material formed to extend along the axial direction and inserted into the through hole to join the two parts, wherein the cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed so that the width on the bottom side is larger than the width of the opening on the joining surfaces, and the rod material comprises: 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 midpoint between the pair of first members when the pair of first members are inserted into both ends of the through hole, wherein the first member has the same cross-sectional shape as the through hole, A method for disassembling a tubular member, wherein the second member has a base end whose cross-sectional shape in the cross section is the same as that of one of the pair of grooves, and a tip end that can enter the other of the pair of grooves from the opening of the other groove, the method comprising: a pulling step of pulling the first member out of the through hole; a separating step of separating one of the two parts of the split tubular body, with the base end of the second member inserted in the groove, from the other after the pulling step; and an extracting step of extracting the second member from the groove after the separating step.

7. A method for disassembling a tubular member as described in claim 6, wherein the axial length of the first member is formed so that, when the first member is inserted into the through hole with the second member inserted in the middle of the through hole before the pulling-out step, it has a protruding portion with one end protruding from the opening of the through hole, and in the pulling-out step, the protruding portion is grasped and an external force is applied, thereby pulling out the first member from the through hole.

8. A stern tube seal system equipped with a stern tube seal device that prevents water from entering the ship by supplying air around the propeller shaft of a ship, comprising: a cylindrical liner fitted and installed around the propeller shaft, comprising: a split cylindrical body formed by combining a plurality of parts that are split along the axial direction of the propeller shaft in a circumferential direction around the propeller shaft; a pair of grooves that are provided along the axial direction on two adjacent joining surfaces that face each other in the circumferential direction and contact each other in two of the plurality of parts, and that form a through hole whose axial direction is the axial direction by connecting openings on the joining surfaces when the two joining surfaces abut; and a bar that is formed extending along the axial direction and is inserted into the through hole to join the two parts, wherein the cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed so that the width on the bottom side is larger than the width of the opening on the joining surfaces.

9. A liner as described in claim 8, wherein the rod material comprises: a first member inserted at least on the bow side of both axial ends of the through hole; and a second member inserted into the through hole at an intermediate position between the pair of first members when the pair of first members are inserted into both ends of the through hole, wherein the first member has a cross-sectional shape in the cross section that is the same as that of the through hole, and the second member has a base end whose cross-sectional shape in the cross section is the same as that of one of the pair of grooves, and a tip end that can enter the interior of the other of the pair of grooves 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 stern end of the propeller shaft; a liner as set forth in claim 8 or 9; and a stern tube seal device installed on the outer periphery of the liner and configured to supply air around the propeller shaft to prevent water from entering the ship.

11. A vessel equipped with a stern tube seal system according to claim 10.

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