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

Abstract

As an example of a tubular member, a liner has a split tubular body constructed by combining two parts that are split along the axial direction of the propeller shaft in the circumferential direction around the propeller shaft, and a pair of grooves that are provided along the axial direction on two joining surfaces of the two parts that face each other in the circumferential direction and contact each other, and that 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 that is formed extending along the axial direction and is inserted into the through hole to join the two parts, and 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.

Description

[Technical field]

[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. [Background technology]

[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 Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6887584 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when replacing the liner of a stern tube seal system, since the liner is generally formed integrally in a cylindrical shape so that it can be fitted around the propeller shaft, it is necessary to remove other surrounding parts, which requires a lot of labor and time. This problem is also the same for other cylindrical members with the same structure 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. [Means for solving the problem]

[0006] A cylindrical member according to one aspect of an embodiment of the present invention includes a split cylindrical body configured by combining in a circumferential direction a plurality of parts that are split along an axial direction; a pair of grooves that are provided along the axial direction on two joining surfaces that face each other in the circumferential direction and are in contact with each other in two adjacent parts of the plurality of parts, the pair of grooves forming 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 a cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed such that a width on a bottom side is larger than a width of the opening on the joining surfaces. The rod material has 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, and 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 portion whose cross-sectional shape in the cross section is the same as that of one of the pair of grooves, and a tip end portion capable of entering the other of the pair of grooves from the opening of the other of the pair of grooves. . Effect of the Invention

[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. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an example of a schematic configuration of a stern tube seal system according to an embodiment; [Diagram 2] FIG. 1 is a perspective view of a liner according to an embodiment, viewed from the bow side. [Diagram 3] FIG. 1 is a perspective view of a liner according to an embodiment, viewed from the stern side. [Figure 4] FIG. 2 is an exploded perspective view of the liner according to the embodiment, seen from the stern side. [Diagram 5] FIG. 1 is a diagram showing a first stage of an assembly procedure for a liner according to an embodiment. [Figure 6] FIG. 13 is a diagram showing a second stage of an assembly procedure for the liner according to the embodiment. [Figure 7] FIG. 13 is a diagram showing a third stage of an assembly procedure for the liner according to the embodiment. [Figure 8] FIG. 13 is a diagram showing a fourth stage of an assembly procedure for the liner according to the embodiment. [Figure 9] FIG. 1 is a diagram showing an example of a bar according to a first modified example. [Figure 10] FIG. 13 is a diagram showing an example of a third member of a rod group according to a second modified example. [Figure 11] FIG. 13 is a diagram showing an example of a cross-sectional shape of a through hole and a bar according to a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components in each drawing are denoted by the same reference numerals as much as possible, and duplicated description 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] 1, the stern tube seal system 200 is installed on a ship 300. The stern tube seal system 200 has a stern tube seal device 10 around a propeller shaft 3 of the ship 300, and further has mainly 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, a 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 an annular portion provided at the end of the tubular portion 4A on the stern side and extending radially outward from the tubular portion 4A. The flange portion 4B is formed to be disposed opposite to the end surface of the boss portion 5A of the propeller 5 on the bow side, and is connected and fixed to this end surface by any configuration such as bolt fixing. As a result, the liner 4 rotates 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 while being stacked 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 comes into 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 portion on the center side of the annular shape being in contact with the outer circumferential surface of the liner 4 .

[0017] Examples of materials for molding the seal ring 9, which is an elastic member, include rubber materials and resin materials 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 side, and the third seal ring 9C and the fourth seal ring 9D are disposed with their lips facing the bow side. An annular chamber is formed between each of the adjacent seal rings 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, the stern tube seal device may have three seal rings 9, and in this embodiment, the first seal ring from the stern side is disposed with its lip facing the stern side, and the second and third seal rings are disposed with their lips facing the bow side.

[0019] An air supply passage 51 extending from the air control unit 30 communicates with 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 passage 51. The supplied air pushes up the lips of the second seal ring 9B and the first seal ring 9A in turn, discharging the air into 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 through one oil supply passage 56, and lubricating oil is supplied to the third oil chamber 20E through 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. The third oil chamber 20E is connected to the oil return passage 54, and the lubricating oil is collected in the oil tank unit 60 through 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 the 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 constituting an oil tank unit 60 via a pressurizing 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 wired or wireless communication, and operations 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 only mechanical, without being connected to a terminal device 100 such as a tablet.

[0023] The oil tank unit 60 has an oil tank 61 and a valve 62 that is normally open and is interposed in the oil return passage 54. The oil tank 61 is pressurized using the pressure of air provided to the oil tank 61 via the pressurizing passage 52, so that the oil pressure of the lubricating oil in the first oil chamber 20C to the third oil chamber 20E is always controlled to be higher than the seawater pressure and the air chamber pressure of the first air chamber 20A and the second air chamber 20B by a constant pressure. Since the oil chamber pressure of the first oil chamber 20C is always controlled to be higher than the air chamber pressure of the second air chamber 20B by a constant pressure, and the lip portion of the third seal ring 9C faces the bow side, the lubricating oil in the first oil chamber 20C can always press the lip portion of the third seal ring 9C against the liner 4. As a result, the lip portion of the third seal ring 9C is always in sliding contact with the liner 4, and leakage of the lubricating oil from the first oil chamber 20C to the second air chamber 20B is prevented.

[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 a position where the oil supply passage 56 extending from the cooler 73 branches off. The oil pump unit 70 supplies the lubricating oil supplied from the oil tank unit 60 to the first oil chamber 20C and the third oil chamber 20E, and supplies the lubricating oil to the second oil chamber 20D through 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 through the oil return passage 54, thereby constantly circulating the lubricating oil.

[0025] The drain recovery unit 80 has a drain path 57 communicating with the second air chamber 20B, and a valve 83 that is normally open in the middle of the drain path 57, in order to drain seawater or lubricating oil when these fluids enter the second air chamber 20B. The drain recovery unit 80 further 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 discharged via the needle valve 82, which is always open, and the leaked seawater and lubricating oil are collected by the drain recovery unit 80.

[0027] [Liner 4 Configuration] 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 viewed from the stern side. Fig. 3 is a perspective view of the liner 4 according to the embodiment as viewed from the bow side. Fig. 4 is an exploded perspective view of the liner 4 according to the embodiment as viewed from the stern side.

[0028] In the following description, the X, Y, and Z directions are perpendicular to each other. The X and Y directions are horizontal, and the Z direction is vertical. The X direction is the fore-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. In the following description, for convenience of description, the positive Z direction side may also be expressed as the upper side, and the negative Z direction side 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, and the flange portion 4B is provided at the end of the tubular portion 4A on the X positive direction side (stern side). A plurality of through holes 4C are provided in the flange portion 4B. The plurality of through holes 4C are each formed by penetrating the flange portion 4B in the X direction and are arranged at approximately equal intervals along the circumferential direction of the annular shape of the flange portion 4B.

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

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

[0032] As shown in Figs. 2 to 4, the liner 4 is a split tubular 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 split body 41 and a second split body 42, the cylindrical shape of which is split into two along the Y direction at the center position in the Z direction. The first split body 41 is a semi-cylindrical member that opens on the Z negative direction side, and the second split body 42 is a semi-cylindrical member that opens on the Z positive direction side. The first split body 41 is disposed on the Z positive direction side, and the second split body 42 is disposed on the Z negative direction side. The first split body 41 and the second split body 42 correspond to the "two parts" that configure the split tubular 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 joint surface 411. The first groove 413 is recessed from the first joint surface 411 toward the Z positive direction and is formed to extend 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 joint 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 in the Y direction with respect to the opening 413A, and thus the dimension in the Y direction is formed to be larger than that of the opening 413A.

[0035] A second groove 414 is provided in the second joint surface 412. The second groove 414 is recessed from the second joint surface 412 toward the Z positive direction and is formed to extend 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 joint 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 in the Y direction with respect to the opening 414A, and thus the dimension in the Y direction is formed to be larger than that of the opening 414A.

[0036] The first groove 413 and the second groove 414 of the first divided body 41 have a cross-sectional shape in a cross section perpendicular to the axial direction (X direction) that is formed 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 joint surface 411 and the second joint surface 412. In this embodiment, the first groove 413 and the second groove 414 have a T-shaped cross-sectional shape.

[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 joint surface 421. The first groove 423 is recessed from the first joint surface 421 toward the Z negative direction and is formed to extend 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 joint surface 421 and includes the opening of the first groove 423. The widened portion 423B is a portion on the Z negative 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 in the Y direction with respect to the opening 423A, and thus the dimension in the Y direction is formed to be larger than that of the opening 423A.

[0039] The second groove 424 is provided in the second joint surface 422. The second groove 424 is recessed from the second joint surface 422 toward the Z negative direction and is formed to extend 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 joint surface 422 and includes the opening of the second groove 424. The widened portion 424B is a portion on the Z positive 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 in the Y direction with respect to the opening 424A, and thus the dimension in the Y direction is formed to be larger than that of the opening 424A.

[0040] The first groove 423 and the second groove 424 of the second divided body 42 have a cross-sectional shape in a cross section perpendicular to the axial direction (X direction) that is formed such that the width on the bottom 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 joint surface 421 and the second joint surface 422. In this embodiment, the first groove 423 and the second groove 424 are formed to have a T-shaped cross-sectional shape.

[0041] When the first divided body 41 and the second divided body 42 are joined, the first joint surface 411 of the first divided body 41 and the first joint surface 421 of the second divided body 42 face each other along the circumferential direction of the cylindrical portion 4A and abut against each other. In addition, since the cylindrical portions of the first divided body 41 and the second divided body 42 are formed to have the same thickness, the first joint surface 411 of the first divided body 41 and the first joint surface 421 of the second divided body 42 are formed to have the same shape. As a result, the first joint surfaces 411, 421 abut against each other with their outer shapes completely overlapping.

[0042] Further, the first groove 413 provided in the first joint surface 411 of the first divided body 41 and the first groove 423 provided in the first joint surface 421 of the second divided body 42 are formed so that their openings are at the same position in the Y direction. As a result, as shown in Figs. 2 and 3, when the first joint surface 411 of the first divided body 41 and the first joint surface 421 of the second divided body 42 come into contact with each other, the openings of the two first grooves 413 and 423 on the joint surfaces are connected to each other, thereby forming 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 and 423 in a cross section perpendicular to the axial direction (X direction) are both T-shaped, so that the cross-sectional shape of the first through hole 49 is formed in an H shape.

[0043] Similarly, when the first division 41 and the second division 42 are joined, the second joint surface 412 of the first division 41 and the second joint surface 422 of the second division 42 face each other and abut against each other along the circumferential direction of the cylindrical portion 4A. In addition, since the cylindrical portions of the first division 41 and the second division 42 are formed to have the same thickness, the second joint surface 412 of the first division 41 and the second joint surface 422 of the second division 42 are formed to have the same shape. As a result, the second joint surfaces 412, 422 abut against each other with their outer shapes completely overlapping.

[0044] Further, the second groove 414 provided in the second joint surface 412 of the first divided body 41 and the second groove 424 provided in the second joint surface 422 of the second divided body 42 are formed so that their openings are at the same position in the Y direction. As a result, as shown in Figs. 2 and 3, when the second joint surface 412 of the first divided body 41 and the second joint surface 422 of the second divided body 42 come into contact with each other, the openings of the two second grooves 414, 424 on the joint surfaces are connected to each other, thereby forming 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, so that the cross-sectional shape of the second through hole 50 is formed in an H shape.

[0045] As shown in FIG. 4, the first joint surface 411 of the first divided body 41 has a pin insertion hole 417 formed to be recessed from the joint surface toward the Z positive direction. Meanwhile, the first joint surface 421 of the second divided body 42 also has a pin insertion hole 427 formed to be recessed from the joint surface toward the Z negative direction. The two pin insertion holes 417, 427 are formed so that their openings are at the same positions in the X direction and the Y direction. 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 communicate with each other in a straight line along the Z direction. Then, one pin 47 is inserted into these two pin insertion holes 417, 427. It is preferable that the cross-sectional shape of the pin 47 is substantially the same as that of the pin insertion holes 417, 427.

[0046] Similarly, the second joint surface 412 of the first divided body 41 has a pin insertion hole 418 formed to be recessed from the joint surface toward the Z positive direction. Meanwhile, the second joint surface 422 of the second divided body 42 also has a pin insertion hole 428 formed to be recessed from the joint surface toward the Z negative direction. The two pin insertion holes 418, 428 are formed so that their openings are at the same positions in the X direction and the Y direction. 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 communicate with each other in a straight line along the Z direction. Then, one pin 48 is inserted into these two pin insertion holes 418, 428. It is preferable that the cross-sectional shape of the pin 48 is 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 made constant, so that the first joint surfaces 411, 421 can be reliably abutted so as to completely overlap each other. This also ensures that the openings of the first grooves 413, 423 can be arranged so as to completely overlap each other, so that the first through hole 49 can be neatly formed on the joint surface without being misaligned in the Y direction. Similarly, it also ensures that the openings of the second grooves 414, 424 can be arranged so as to completely overlap each other, so that the second through hole 50 can also be neatly formed on the joint surface without being misaligned in the Y direction.

[0048] As shown in FIG. 4, the portion of the first divided body 41 corresponding to the flange portion 4B is provided at the end on the Y negative side with a cutout portion 415 formed by recessing from the annular outer circumferential surface toward the Y positive side. The cutout portion 415 is formed so that the portion of the first divided body 41 corresponding to the flange portion 4B from the second joint surface 412 to a predetermined height position on the Z positive side remains. In other words, a protruding portion extending from the center side of the first divided body 41 in the Y negative direction remains on the Z negative side of the cutout portion 415. A bolt insertion hole 416 formed by penetrating in the Z direction is provided in this protruding portion. On the other hand, a bolt screwing hole 430 formed by recessing in the Z negative direction and further having an internal thread groove cut on the inner circumferential surface is provided on the second joint surface 412 of the second divided body 42 at a position overlapping with the bolt insertion hole 416. When the first and second dividers 41 and 42 are joined, a bolt 45 is inserted into the bolt insertion hole 416 from the positive Z side and screwed into the bolt screwing hole 430, thereby connecting and fixing the second joint surface 412 of the first divider 41 and the second joint surface 422 of the second divider 42 in an abutting state.

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

[0050] In addition, by configuring bolt 45 to be fastened from the first division 41 side and bolt 46 to be fastened from the second division 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 division 41 and the second division 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 extending along the axial direction of the first through hole 49, and is an element that joins the first divided body 41 and the second divided body 42 by being inserted into the first through hole 49. The second bar group 44 is formed extending along the axial direction of the second through hole 50, and is an element that joins the first divided body 41 and the second divided body 42 by being inserted into the second through hole 50.

[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 the same cross-sectional shape as 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 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 widening 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 widening 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, extends in the Z direction, and connects 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 is 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 432B that is 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 432C that is 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. 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 (widened portion 423B) of the first groove 423 of the second divided body 42 from the opening (opening 423A) of this groove. 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 this 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 widening 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 widening 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, extends in the Z direction, and connects 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 is 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 442B that is 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 442C that is the same shape as the opening 414A of the second groove 414 and the opening 424A of the second groove 424, extends in the Z direction, and connects the first flat plate portion 442A and the second flat plate portion 442B. 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 (widened portion 414B) of the second groove 414 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 technique 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 this embodiment includes a split cylindrical body configured by combining two parts (a first split body 41 and a second split body 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 split body 41 and a first joint surface 421 of the second split body 42, and a second joint surface 412 of the first split body 41 and a second joint surface 422 of the second split body 42) that face each other in the circumferential direction and are provided along the axial direction in the first split body 41 and the second split body 42, and when the two joint surfaces come into contact with each other, The upper openings are connected to form a pair of grooves (first groove 413 of first division 41 and first groove 423 of second division 42, and second groove 414 of first division 41 and second groove 424 of second division 42) that form through holes (first through hole 49 and second through hole 50) whose axial direction is the axial direction, and bars (first bar group 43, second bar group 44) that are formed extending 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 side 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 brought into contact with each other, facilitating the installation of a cylindrical member such as the liner 4. Similarly, the first division 41 and the second division 42 can be easily separated from each other simply by pulling out the rod inserted in the through hole from the through hole, so that the cylindrical member such as the liner 4 can also be easily removed.

[0062] In particular, when the cylindrical member according to the embodiment is applied to a liner 4, the liner 4 needs to be replaced in the stern tube seal system 200 in which the liner 4 is installed. However, in the case of a conventional type of liner that is integrally molded into a cylindrical shape, it is necessary to once remove the propeller 5 from the propeller shaft 3 in order to replace the liner, and then to pull out the liner from the propeller shaft 3, which is very time-consuming. In response to such a conventional problem, the liner 4 having a split cylindrical body can be applied in the present embodiment, so that if the liner 4 is disassembled, it becomes possible to remove the liner 4 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, since the shape of each groove forming the through holes 49, 50 is formed such that the width of the bottom side is larger than the width of the opening, the cross-sectional shape of each through hole 49, 50 has the narrowest width dimension in the Y direction at the contact part between the joint surfaces at the center in the Z direction, and the width dimension is relatively larger at the Z positive direction side and the Z negative direction side from the contact part. The cross-sectional shape of each bar inserted into the through holes 49, 50 having such a shape is also similar. By using such through holes and bar, the inner side surface of each groove forming the through hole can be abutted against the side surface of the bar inserted into this groove, so that each groove can be prevented from coming out of the bar in the Z direction, and as a result, even when an external force is applied, the first divided body 41 and the second divided body 42 can be prevented from unexpectedly separating from each other. In addition, since each groove can be prevented from moving in the Y direction relative to the bar, the occurrence of misalignment in the Y direction between the first divided body 41 and the second divided body 42 can be prevented. This allows the first divided body 41 and the second divided body 42 to be joined more stably.

[0064] In this embodiment, the joining structure between the first divided body 41 and the second divided body 42 is configured to insert a rod extending along the axial direction into a through hole provided along the axial direction of the split cylindrical body formed by joining the first divided body 41 and the second divided body 42. With this configuration, the rod is interposed over the entire axial area in the region where the joining surface of the first divided body 41 and the joining surface of the second divided body 42 abut, so that leakage of liquid or gas at the joining portion of the split cylindrical body can be suppressed. Also, in the case of this configuration, each element of the joining structure can be arranged inside the member that forms the cylindrical shape. As a result, each element of the joining structure is not exposed to the outside of the cylindrical member after the split cylindrical body is joined, so that deterioration of each element can be suppressed and the life of the cylindrical member can be extended.

[0065] In addition, the joining structure between the first divided body 41 and the second divided body 42 requires only a pair of grooves provided on the joining surface and a bar inserted into the through hole formed by these grooves, that is, it can be contained only within the width dimension of the joining surface, so even in the liner 4 having a split cylindrical body, the wall thickness of the cylindrical portion 4A can be made as thin as that of a liner that is integrally molded into a cylindrical shape. This makes it possible to reduce the weight of a cylindrical member such as the liner 4 having a split cylindrical body. In addition, since there is no need to provide an element for joining, such as a bolt fastening portion, on the outer periphery of the cylindrical portion 4A, the cylindrical member can also be made smaller. Due to the advantages of such weight reduction and size reduction, the field of application of the cylindrical member can be expanded and versatility can be improved.

[0066] In the liner 4 as an example of a cylindrical member according to this embodiment, the first rod group 43 as an example of a rod has 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 a middle position between the pair of first members 431, 432 in a state in which 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 capable of entering the interior of the other of the pair of grooves from an opening of the other of the pair of grooves.

[0067] Similarly, in the liner 4 as an example of a cylindrical member according to this embodiment, the second rod group 44 as an example of a rod has 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 a midpoint between the pair of first members 441, 442 in a state in which 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 capable of entering the interior of the other of the pair of grooves from the opening of the other of the pair of grooves.

[0068] With these configurations, the engagement portions between the through holes 49, 50 and the rod material can be limited to the portions 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 assembly and disassembly of the liner 4 easier and improving work efficiency.

[0069] [How to assemble and disassemble the liner 4] A method of assembling the liner 4 will be described with reference to FIGS.

[0070] FIG. 5 is a diagram showing a first stage of the assembly procedure of 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 bar group 43 is inserted into the first groove 413 of the first divided body 41. Similarly, the base end 443A of the second member 443 of the second bar group 44 is inserted into the second groove 424 of the second divided body 42. In addition, in the first stage, a sealant is applied to the second groove 414 of the first divided body 41 and the first groove 423 of the second divided body 42. Note that the sealant may be applied to the second members 433 and 443 to be inserted into the grooves 413 and 424. In addition, the pin 47 is inserted into the pin insertion hole 417 of the first divided body 41, and the pin 48 is inserted into the pin insertion hole 428 of the second divided body 42.

[0071] 6 is a diagram showing a second stage of the assembly procedure of 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 divided body 41 after the first stage is inserted into the opening of the first groove 423 of the second divided body 42, and the tip portion 443B of the second member 443 protruding from the opening of the second groove 424 of the second divided body 42 is inserted into the opening of the second groove 414 of the first divided body 41, so that the first joint surfaces 411, 421 and the second joint surfaces 412, 422 of the first divided body 41 and the second divided body 42 constituting the split cylindrical body are abutted against each other. At this time, since the sealant is applied in the first stage, the sealant is filled in the gaps in the grooves 423, 414 where the tip portions 433B, 443B of the second members are inserted. In the second stage, pin 47 is inserted into pin insertion hole 427 of second divider 42, and pin 48 is inserted into pin insertion hole 418 of first divider 41, thereby positioning the first divider 41 and second divider 42 relative to each other at a constant position by the two pins 47, 48.

[0072] 7 is a diagram showing a third stage of the assembly procedure of the liner 4 according to the embodiment. As shown in FIG. 7, in the third stage (insertion step), among the openings at both ends in the axial direction of the first through hole 49 formed by the first groove 413 of the first division body 41 and the first groove 423 of the second division body 42 after the second stage, one first member 431 of the first bar group 43 is inserted from the opening at the end face 4D on the stern side of the liner 4. Similarly, among the openings at both ends in the axial direction of the second through hole 50 formed by the second groove 414 of the first division body 41 and the second groove 424 of the second division body 42 after the second stage, one first member 441 of the second bar group 44 is inserted from the opening at the end face 4D on the stern side of the liner 4. In the third stage, the bolt 45 is inserted into the bolt insertion hole 416 of the first division body 41 and screwed into the bolt screwing hole 430 of the second division body 42, and the bolt 46 is inserted into the bolt insertion hole 426 of the second division body 42 and screwed into the bolt screwing hole 420 of the first division body 41.

[0073] Fig. 8 is a diagram showing a fourth stage of the assembly procedure of 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 on the bow end face 4E side of the liner 4, among the openings on both axial ends of the first through hole 49. Similarly, the other first member 442 of the second bar group 44 is inserted from the opening on the bow end face 4E side of the liner 4, among the openings on both axial ends of the second through hole 50.

[0074] The liner 4 can be disassembled by reversing the procedure of the assembly method. That is, the following steps are performed in order: an extracting step of extracting the first members 431, 441 on the stern side and the first members 432, 442 on the bow side from the through holes 49, 50; a separating step of separating one of the first divided body 41 and the second divided body 42 of the split cylindrical body in which the base ends 433A, 443A of the second members 433, 443 are inserted into the grooves; and an extracting step of extracting the second members 433, 443 from the grooves 413, 424 after the separating step.

[0075] For example, a situation may occur in which an orderer who owns the ship 300 orders only the liner 4 from the manufacturer, and the manufacturer delivers the liner 4 in a provisionally assembled state to the customer. In this case, the orderer disassembles the provisionally assembled liner 4 that he or she received, and assembles the liner 4 around the propeller shaft 3 of the ship 300 that he or she owns, thereby completing the assembly of the liner 4.

[0076] In such a situation, in the above-mentioned 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 are formed 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, and that they are in a provisionally assembled state. In this case, in the above-mentioned disassembly method, in the extraction step, the protruding portions are grasped and an external force is applied, so that the stern-side first members 431, 441 and the bow-side first members 432, 442 are extracted from the through holes 49, 50. This makes it easier to extract the stern-side first members 431, 441 and the bow-side first members 432, 442, and improves the efficiency of the disassembly work.

[0077] In such a situation, when the liner 4 is assembled, it is preferable to perform a process (removal step) of cutting off the protruding parts of each member to make the end faces of the opening side of the stern side first members 431, 441 and the bow side first members 432, 442 flush with the axial end faces of the split cylindrical body (i.e., the stern side end face 4D and the bow side end face 4E of the liner 4) after the fourth stage (insertion step) of the assembly procedure described with reference to Figures 7 and 8. This allows the first bar group 43 and the second bar group 44 to have a shape that does not protrude from the end faces 4D and 4E of the liner 4 after the assembly, so that the first bar group 43 and the second bar group 44 can be prevented from being damaged or coming out due to the application of an external force, and the life of the liner 4 can be extended.

[0078] [First Modification] 9 is a diagram showing an example of the bars 43A, 44A according to the first modified example. In the above embodiment, the first bar group 43 and the second bar group 44 are divided into three members along the axial direction of the through holes 49, 50, respectively, but may be replaced with a single bar 43A, 44A along the axial direction.

[0079] In this case, as shown in Fig. 9, the cross-sectional shapes of all the bars 43A, 44A at each position in the axial direction are H-shaped. Also, 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 connect the first divided body 41 and the second divided body 42 by being inserted into the through holes 49, 50, respectively.

[0080] [Second modified example] Fig. 10 is a diagram showing an example of the second member 434 of the rod group according to the second modified example. In the above embodiment, as shown in Fig. 4 and the like, the configuration in which the tip portions 433B, 443B of the second members 433, 443 are formed to have the same width in the extension direction along the Z direction in the cross-sectional shape is exemplified, but is not limited to this as long as the tip portions 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, a tip portion 434B may have a tapered shape in which the width decreases toward the tip side. The shape of a base end portion 434A of the second member 434 is similar to the base ends 433A and 443A of the above embodiment.

[0082] [Third Modification] FIG. 11 is a diagram showing an example of the cross-sectional shape of the through hole 49A and the bar 435 according to the third modified example. In the above embodiment, the cross-sectional shapes of the through hole 49, 50, the first members 431, 441 on the stern side of the bar group 43, 44, and the first members 432, 442 on the bow side are all H-shaped, but other shapes may be used. In short, 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 side is larger than the width of the opening on the joint surface. For example, as shown in FIG. 11 for the groove 419 of the first divided body 41 and the groove 429 of the second divided body 42, the width dimension in the Y direction may gradually increase as the groove approaches the bottom surface of the groove from the opening of the groove. In this case, the cross-sectional shape of the through hole 49A formed by the two grooves 419, 429 is an hourglass shape that is narrowest at the opening of the joint surfaces 411, 421 and gradually widens along the vertical direction. In this case, the cross-sectional shape of the bar 435 is also hourglass-shaped like 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. Any design modifications made by a person skilled in the art to these specific examples are also included within the scope of the present disclosure as long as they have the features of the present disclosure. The elements of each of the above-mentioned specific examples and their arrangements, conditions, shapes, etc. are not limited to those exemplified and can be changed as appropriate. The combination of each of the elements of each of the above-mentioned specific examples can be changed as appropriate as long as no technical contradiction occurs.

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

[0086] In the liner 4 exemplified as an example of a cylindrical member in the above embodiment, the first bar 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 one first member 431 is inserted into the end of the through hole 49 on the stern side, the other first member 432 is inserted into the end of the through hole 49 on the bow side, and the second member 433 is inserted into the middle position of the pair of first members 431, 432. Alternatively, the stern first member 431 may not be inserted into the through hole 49. In other words, the second member 433 may be inserted into the center position of the through hole 49, and the other first member 432 may be inserted into the end of the through hole 49 on the bow side. In other words, the first bar group 43 may be configured to include 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 division body 41 and the second division body 42 are not connected by the first bar group 43. However, even in this configuration, the first division body 41 and the second division body 42 are fastened by two bolts 45, 46 at the stern flange portion 4B, so that the division bodies 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 cylindrical member in the above embodiment, the second bar group 44 to be inserted into the through hole 50 has one first member 441 and the other first member 442 and second member 443. In this configuration, the one first member 441 is inserted into the end of the through hole 50 on the stern side, the other first member 442 is inserted into the end of the through hole 50 on the bow side, and the second member 443 is inserted into the middle position of the pair of first members 441, 442. In contrast to this configuration, the stern first member 441 may not be inserted into the through hole 50. In other words, the second member 443 may be inserted into the center position of the through hole 50, and the other first member 442 may be inserted into the end of the through hole 50 on the bow side. In other words, the second bar group 44 may be configured to include two members, the other first member 442 inserted into the bow 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 end of the through hole 50 is hollow, and the first division body 41 and the second division body 42 are not connected by the second bar group 44. However, even in this configuration, the first division body 41 and the second division body 42 are fastened by two bolts 45, 46 at the stern flange portion 4B, so that the division bodies 41, 42 can be connected sufficiently firmly even in the stern portion of the liner 4.

[0088] In addition, the liner 4 used in the stern tube seal system 200 may have a tapered inner diameter portion on the stern side (X positive direction side). In such a case, the portion of the first member 431, 441 inserted into the stern side end of the through hole 49, 50 that is exposed from the through hole 49, 50 must also be cut into a tapered shape similar to the inner diameter portion. This requires a complicated response in the assembly process of the liner 4. Therefore, if the first member 431, 441 is not inserted into the stern side end of the through hole 49, 50, it becomes unnecessary to process the exposed portion of the first member 431, 441 from the through hole 49, 50 to be flush with the end face 4D of the stern side (X positive direction side) of the liner 4. This makes it possible to avoid the problem that complicated work is required in the assembly process of the liner 4.

[0089] In the case of a configuration in which the first members 431, 441 are not inserted, it is possible to take measures such as applying a sealant (liquid packing) to the first joint surfaces 411, 421 and the second joint surfaces 412, 422 of the first division 41 and the second division 42, respectively, to assemble the liner 4, or to sandwich a gasket (sheet packing) between the flange surface (end surface 4D on the stern side) 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 a bolt fastening, the first member may not be inserted into one end of the through holes 49, 50. With these configurations, as in the above embodiment, it is possible to achieve the effects of facilitating installation and removal of a 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. [Explanation of symbols]

[0091] 4 Liner (cylindrical member) 41 First division body (division type cylindrical body) 411 1st joint surface 412 2nd joint surface 413 First groove 414 2nd groove 42 Second division body (division type cylindrical body) 421 1st joint surface 422 Second joint surface 423 First groove 424 2nd groove 43 1st bar group (bar) 44 2nd bar group (bar) 431, 432, 441, 442 First member 433, 443, 434 Second member 435 Bar material 49 First Through Hole 50 Second through hole 1 Stern tube 3 Propeller shaft 5 Propeller 10. Stern tube seal device 200 Stern Tube Seal System 300 ships

Claims

1. A split cylindrical body configured by combining a plurality of parts split along an axial direction in a circumferential direction; a pair of grooves that are provided along the axial direction on two joining surfaces that face each other in the circumferential direction in two adjacent components among the plurality of components, the pair of grooves forming a through hole whose axis direction is in the axial direction by connecting openings on the joining surfaces when the two joining surfaces abut against each other; a bar extending along the axial direction and inserted into the through hole to join the two components; Equipped with A cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed such that a width on a bottom surface side is larger than a width of the opening on the joining surface, The rod material is A first member is inserted into at least one of both ends of the through hole in the axial direction; a second member that is inserted into the through hole at a middle position between the pair of first members when the pair of first members are inserted into both ends of the through hole; having The first member has a cross-sectional shape in the cross section that is the same as the through hole, The second member has a base end portion having a cross-sectional shape identical to that of one of the pair of grooves in the cross section, and a tip end portion capable of entering the other of the pair of grooves from the opening of the other of the pair of grooves. Cylindrical member.

2. The groove is formed so that the cross-sectional shape in the cross section is T-shaped, The through hole formed by combining the pair of grooves has an H-shaped cross section. The tubular member according to claim 1 .

3. A split cylindrical body configured by combining a plurality of parts split along an axial direction in a circumferential direction; a pair of grooves that are provided along the axial direction on two joining surfaces that face each other in the circumferential direction in two adjacent components among the plurality of components, the pair of grooves forming a through hole whose axis direction is in the axial direction by connecting openings on the joining surfaces when the two joining surfaces abut against each other; a bar extending along the axial direction and inserted into the through hole to join the two components; Equipped with A cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed such that a width on a bottom surface side is larger than a width of the opening on the joining surface, The rod material is A first member is inserted into at least one of both ends of the through hole in the axial direction; a second member that is inserted into the through hole at a middle position between the pair of first members when the pair of first members are inserted into both ends of the through hole; having The first member has a cross-sectional shape in the cross section that is the same as the through hole, The second member has a base end portion having a cross-sectional shape identical to that of one of the pair of grooves in the cross section, and a tip end portion capable of entering the other of the pair of grooves from the opening of the other of the pair of grooves. A method for assembling a tubular member, comprising the steps of: an insertion step of inserting the base end portion of the second member into one of the pair of grooves; a contact step of contacting the joint surfaces of the two parts of the split cylindrical body with each other by inserting the tip end of the second 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; an insertion step of inserting the first member through at least one of openings at both ends in the axial direction of the through hole formed by the pair of grooves after the abutting step; Including, A method for assembling a tubular member.

4. the length of the first member in the axial direction is formed so as to have a protruding portion having one end protruding from the opening of the through hole when the first member is inserted into the through hole in the inserting step; a cutting step of cutting off the protruding portion after inserting the first member into the through hole in the inserting step, so that an end face of the first member on the opening side is flush with an end face of the split cylindrical body in the axial direction; Including, A method for assembling a tubular member according to claim 3.

5. A split cylindrical body configured by combining a plurality of parts split along an axial direction in a circumferential direction; a pair of grooves that are provided along the axial direction on two joining surfaces that face each other in the circumferential direction in two adjacent components among the plurality of components, the pair of grooves forming a through hole whose axis direction is in the axial direction by connecting openings on the joining surfaces when the two joining surfaces abut against each other; a bar extending along the axial direction and inserted into the through hole to join the two components; Equipped with A cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed such that a width on a bottom surface side is larger than a width of the opening on the joining surface, The rod material is A first member is inserted into at least one of both ends of the through hole in the axial direction; a second member that is inserted into the through hole at a middle position between the pair of first members when the pair of first members are inserted into both ends of the through hole; having The first member has a cross-sectional shape in the cross section that is the same as the through hole, The second member has a base end portion having a cross-sectional shape identical to that of one of the pair of grooves in the cross section, and a tip end portion capable of entering the other of the pair of grooves from the opening of the other of the pair of grooves. A method for disassembling a tubular member, comprising the steps of: 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, in which the base end of the second member is inserted into the groove, from the other part after the pulling step; a step of extracting the second member from the groove after the separating step; Including, A method for disassembling a tubular member.

6. the length of the first member in the axial direction is formed so as to have a protruding portion having one end protruding from an opening of the through hole when the first member is inserted into the through hole with the second member being inserted through the middle of the through hole before the pulling step; In the pulling-out step, the protruding portion is gripped and an external force is applied thereto, thereby pulling out the first member from the through hole. The method for disassembling a tubular member according to claim 5.

7. A stern tube seal system including a stern tube seal device that prevents water from entering the ship by supplying air around the propeller shaft, comprising a cylindrical liner that is fitted around the propeller shaft, A split cylindrical body configured by combining a plurality of parts 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 joining surfaces that face each other in the circumferential direction in two adjacent components among the plurality of components, the pair of grooves forming a through hole whose axis direction is in the axial direction by connecting openings on the joining surfaces when the two joining surfaces abut against each other; a bar extending along the axial direction and inserted into the through hole to join the two components; having A cross-sectional shape of the groove in a cross section perpendicular to the axial direction is formed so that a width on a bottom surface side is larger than a width of the opening on the joining surface. liner.

8. The rod material is A first member inserted at least on a bow side of both ends of the through hole in the axial direction; a second member that is inserted into the through hole at a middle position between the pair of first members when the pair of first members are inserted into both ends of the through hole; having The first member has a cross-sectional shape in the cross section that is the same as the through hole, The second member has a base end portion having a cross-sectional shape identical to that of one of the pair of grooves in the cross section, and a tip end portion capable of entering the other of the pair of grooves from the opening of the other of the pair of grooves. The liner of claim 7.

9. Stern tube and A propeller shaft rotatably supported by the stern tube; A propeller fixed to a tip of the propeller shaft on the stern side; A liner according to claim 7 or 8; a stern tube seal device that is installed on an outer circumferential side of the liner and that supplies air around the propeller shaft to prevent water from entering the ship; A stern tube seal system comprising:

10. A vessel comprising the stern tube seal system according to claim 9.