WO2024116324A1 - 船舶推進軸用の軸受及び軸受再生方法 - Google Patents

船舶推進軸用の軸受及び軸受再生方法 Download PDF

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Publication number
WO2024116324A1
WO2024116324A1 PCT/JP2022/044167 JP2022044167W WO2024116324A1 WO 2024116324 A1 WO2024116324 A1 WO 2024116324A1 JP 2022044167 W JP2022044167 W JP 2022044167W WO 2024116324 A1 WO2024116324 A1 WO 2024116324A1
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WIPO (PCT)
Prior art keywords
arc piece
shell
arc
bearing
group
Prior art date
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Ceased
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PCT/JP2022/044167
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English (en)
French (fr)
Japanese (ja)
Inventor
正孝 四方
大輝 池本
賢司 横垣
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Mikasa Corp
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Mikasa Corp
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Publication date
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Priority to PCT/JP2022/044167 priority Critical patent/WO2024116324A1/ja
Priority to JP2024561055A priority patent/JP7792729B2/ja
Priority to GB2509085.3A priority patent/GB2640080A/en
Publication of WO2024116324A1 publication Critical patent/WO2024116324A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/02—Assembling sliding-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/04—Hardness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/30—Fluoropolymers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/30—Fluoropolymers
    • F16C2208/32—Polytetrafluorethylene [PTFE]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2237/00—Repair or replacement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/30—Angles, e.g. inclinations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/40—Application independent of particular apparatuses related to environment, i.e. operating conditions
    • F16C2300/42—Application independent of particular apparatuses related to environment, i.e. operating conditions corrosive, i.e. with aggressive media or harsh conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/30—Ships, e.g. propelling shafts and bearings therefor

Definitions

  • Non-Patent Document 1 which summarizes the structure and characteristics of such bearings, water-lubricated bearings are being used in place of the conventional oil-lubricated bearings for bearings in small and medium-sized ships, and it is said that in the future, the shift to water-lubricated bearings will progress even in large ships.
  • Various water-lubricated bearings are also proposed in patent documents.
  • Patent Document 1 proposes a bearing in which a pair of positioning plates and a number of sealed arc pieces and gap-shaped arc pieces are arranged on the inner circumferential surface of a cylindrical shell that supports the propeller shaft of a ship, the positioning plates are fixed at opposing positions on the horizontal axis of the shell, the sealed arc pieces are arranged on the underside of the shell below the positioning plates and are subjected to the load of the propeller shaft, the gap-shaped arc pieces are arranged on the upper surface of the shell opposite the sealed arc pieces and have grooves on both side edges for circulating cooling water, and both the sealed arc pieces and the gap-shaped arc pieces have a three-layer structure consisting of a sliding layer, an intermediate layer made of an elastic material, and a base that is in close contact with the inner circumferential surface of the shell.
  • This bearing has a sliding layer made of a material with a smooth surface and excellent wear resistance and heat resistance, and an elastic layer that can equalize the load from the propeller shaft, and is said to have low friction, wear resistance, and durability, and also has excellent corrosion resistance because the elastic layer is protected from water or seawater.
  • Patent Document 2 proposes a split bearing in which the sliding material of the bearing member is made of rubber to form a first bearing member (20a), the sliding material of the bearing member provided in the approximately lower half (L) of the shell is made of fluororesin to form a second bearing member (20b), and stoppers (30, 30a) are provided between the approximately upper and lower halves of the shell to prevent circumferential movement of the bearing member.
  • This split bearing is said to have less sliding resistance to the propeller shaft than conventional split bearings, and to improve the fuel efficiency of ships.
  • split bearings have been used as bearings that support the propeller shaft of ships, and it is described that split bearings have the advantage of being easy to repair, since only the bearing members that are most worn can be replaced.
  • Patent Documents 1 and 2 are not only highly wear-resistant, but also have the advantage that the bearing members (arc pieces) that form the bearings can be stored in reserve and only those bearing members that are severely worn can be replaced.
  • the range of bearing members that need to be replaced is not necessarily narrow, and the replacement work of bearing members is not easy.
  • emergency measures are required due to unexpected damage to bearing members caused by poor alignment, whirling of the propeller shaft, or sailing with the propeller half submerged, and in such cases, rapid response is required.
  • bearing wear progresses in the lower part of the stern side, which supports most of the propeller load. For this reason, from the standpoint of safety and propulsion efficiency, an upper limit on the amount of wear in this area is generally set, and appropriate management of the amount of wear is required.
  • the present invention aims to provide a water-lubricated bearing that is not only excellent in wear resistance and durability, but also allows the bearing components that make up the bearing to be easily and quickly replaced without the need for spare parts, in response to such conventional problems and demands, and to provide a method for regenerating the bearing.
  • the bearing according to the present invention comprises a pair of positioning plates fixed to the inner peripheral surface of a cylindrical shell supporting a ship's propulsion shaft, facing each other on the horizontal axis of the shell, an anchor member fixed to the lowest point Pb of the shell, and an arc piece, the arc piece comprising a bottom arc piece that fits into the anchor member, an upper arc piece disposed on the upper part of the positioning plate, and a lower arc piece disposed on the lower part.
  • the horizontal axis refers to the axis perpendicular to the center line of gravity of the propulsion shaft in the cross section of the shell.
  • the arc piece that contacts the lower edge of the positioning plate has a shape that can be replaced with the bottom arc piece.
  • the lower plate can be pulled out of the shell with a predetermined pulling force when all the arc pieces are arranged on the inner peripheral surface of the shell.
  • the upper plate is grounded against a circular arc piece that contacts it, and the lower plate is grounded against a circular arc piece that contacts it.
  • the upper arc piece can be a gap-type arc piece
  • the lower arc piece can be a gap-type arc piece or a closed arc piece.
  • the bearing regeneration method is a bearing regeneration method for a cylindrical shell that supports a ship's propulsion shaft, which has a pair of positioning plates fixed to the inner peripheral surface of the shell in opposition to each other on the horizontal axis of the shell, an anchor member fixed to the lowest point Pb of the shell, and an arc piece, the arc pieces having a bottom arc piece that fits into the anchor member, an upper arc piece disposed on the upper part of the positioning plate, and a lower arc piece disposed on the lower part, and when the wear depth of the lowest point Pb part reaches a predetermined value in the worn part W occurring on the stern side of the lower arc piece, the arc pieces 15 that are less worn are arranged closer to the lowest point Pb of the inner peripheral surface of the shell 11, and the arc pieces 15 that are more worn are arranged farther from the lowest point Pb.
  • the horizontal axis refers to an axis perpendicular to the center line of the propulsion shaft in the cross section of the shell.
  • the rearrangement of the arc pieces should be performed in a manner that ensures the continuity of the wear cross section of the worn portion W.
  • the bearing according to the present invention can be a bearing having a pair of positioning plates fixed to the inner peripheral surface of a cylindrical shell supporting a ship's propulsion shaft, facing each other on the horizontal axis of the shell, an anchor member fixed to the lowest point Pb of the shell, and an arc piece, the positioning plate being a band-shaped body formed by meshing with an upper plate having a shell fixing means and a lower plate held on the inner peripheral surface of the shell via the upper plate, the arc piece having a bottom arc piece that fits into the anchor member, an upper arc piece disposed on the upper part of the positioning plate, and a lower arc piece disposed on the lower part, the lower arc piece having an arc piece that contacts the lower edge of the arc piece that contacts the lower edge of the positioning plate, and a substitute arc piece that can be replaced with the bottom arc piece.
  • the horizontal axis refers to an axis perpendicular to the center line of the propulsion shaft in the cross section of the shell.
  • the bearing regeneration method according to the present invention is carried out by first pulling out the lower plate from the shell, then pulling out the right arc piece group from the shell as a group, reversing the axial direction and re-arranging the group as a group in the shell, and pulling out the left arc piece group from the shell as a group, reversing the axial direction and re-arranging the group as a group in the shell, thereby rearranging the arc pieces.
  • the vertical axis refers to the axis that is opposite to the direction of the center of gravity of the propeller shaft that is perpendicular to the horizontal axis
  • the right side of the vertical axis refers to the right side of the shell cross section.
  • the bearing regeneration method according to the present invention is carried out by first pulling out the lower plate from the shell, then pulling out the right arc piece group from the shell as a group, reversing the axial direction and re-arranging the group as a group in the shell, and then pulling out the left arc piece group from the shell as a group, reversing the axial direction and re-arranging the group as a group in the shell, and rearranging the arc pieces as a group in the shell.
  • the vertical axis refers to the axis that is opposite to the direction of the center of gravity of the propeller shaft that is perpendicular to the horizontal axis
  • the right side of the vertical axis refers to the right side of the shell cross section.
  • the bearing according to the present invention allows the arc pieces to be easily and quickly arranged on the inner peripheral surface of the shell, and has excellent wear resistance and durability.
  • the bearing regeneration method according to the present invention rearranges arc pieces that are severely worn or damaged as a group with arc pieces that are less worn or damaged or are in good condition, so that the bearing can be regenerated easily and quickly without using spare parts.
  • FIG. 1A is a front view and a side view of a bearing in which the arc pieces are made up of only gap-type arc pieces
  • FIG. 1B is a side view of a bearing in which the arc pieces are made up of gap-type arc pieces and closed-type arc pieces
  • FIG. 2(a) is a detailed view of part A in FIG. 1(a)
  • FIG. 2(b) is an enlarged view of the positioning plate portion.
  • Fig. 3(a) shows an enlarged partial cross-sectional view of the anchor member, in which two bottom arc pieces (gap-type arc pieces) on the left and right are fitted to the anchor member
  • 3(b) shows a case in which one arc piece (closed arc piece) is fitted to the anchor member.
  • 4(a) is a diagram showing the shape and configuration of various arc pieces.
  • Fig. 4(b) is a diagram explaining the configuration of the closed arc piece.
  • Fig. 4(c) is a diagram explaining the arrangement of the groove of the bottom arc piece that fits into the anchor member.
  • Fig. 4(d) is a diagram explaining the notch provided on the side end of the closed arc piece that contacts the lower edge of the positioning plate.
  • 1A to 1C are schematic diagrams showing a worn state of a bearing and an explanatory diagram of a bearing regeneration method.
  • FIG. 2 is an explanatory diagram of a bearing regeneration method.
  • FIG. 1 shows a front view and a side view of the bearing. As shown in the side view, the bearing is divided into upper and lower halves by a horizontal axis (HA).
  • the bearing according to the present invention is a barrel-type bearing in which an arc piece is held on the inner circumferential surface of a cylindrical shell that supports the propulsion shaft of a ship. As shown in FIG. 1, the arc piece is held on the inner circumferential surface of a shell 11 having an axially long main body 110 and a flange 111 provided on its end surface. In this example, the flange side of the bearing 10 is on the stern side.
  • This bearing 10 comprises a pair of positioning plates 12 fixed to the inner circumferential surface of the cylindrical shell 11 that supports the propulsion shaft of the ship, facing each other on the horizontal axis of the shell 11, an anchor member 13 fixed to the lowest point Pb of the shell, and an arc piece 15.
  • the arc pieces 15 are composed of a bottom arc piece 15b that fits into the anchor member 13, an upper arc piece disposed on the upper part of the positioning plate 12, and a lower arc piece disposed on the lower part.
  • the horizontal axis is an axis perpendicular to the center of gravity of the propeller shaft in the cross section of the shell 11. Note that FIG. 1(a) shows a bearing consisting of only gap-type arc pieces, which will be described below, and FIG.
  • FIG. 1(b) shows a side view of a bearing consisting of an upper arc piece consisting of a gap-type arc piece and a lower arc piece consisting of a closed arc piece.
  • the bearing 10 in this example has a flange 111 as described above, but there are also bearings without the flange 111.
  • the mounting direction of the bearing may be reversed from that of the bearing 10 in this example, with the flange side facing the bow.
  • the positioning plate 12 is an integral band-shaped body formed by the upper plate 121 and the lower plate 122 engaging with each other.
  • the upper plate 121 has a shell fixing means, and in this example, is screwed to the shell 11.
  • the upper plate 121 and the lower plate 122 have an engaging surface 123, and the lower plate 122 is held on the inner surface of the shell 11 via the upper plate 121 so as not to fall off or become loose.
  • the lower plate 122 can be pulled out from the bearing 10 in which the positioning plate 12 and the arc piece 15 are arranged with a predetermined pulling force.
  • the upper plate 121 and the lower plate 122 have a tapered shape such that the engaging surface 123 becomes thicker (wider) toward the stern side, as shown in FIG. 2(b). It is preferable that the lower plate 122 can be pulled out with a pulling force of 0.1 to 20.0 tons. This allows bearings to be easily and quickly reconditioned using the bearing reconditioning method described below.
  • the structure of the mating surface 123 of the positioning plate 12 is not limited to this example and may be of other configurations. For example, it may be of a configuration in which a wedge is driven between the upper plate and the lower plate to fix them together.
  • the anchor member 13 is provided at the lowest point Pb of the inner peripheral surface of the shell 11 and is fixed so as to extend in the axial direction of the shell 11.
  • the anchor member 13 is screwed to the shell 11.
  • the anchor member 13 has the function of fixing the bottom arc piece 15b in a predetermined position.
  • the arc piece 15 is disposed on the inner peripheral surface of the shell based on the bottom arc piece 15b fitted into the anchor member 13. This allows the assembly work of the arc piece 15 to be performed easily and quickly.
  • the anchor member 13 in this example is strip-shaped, it may be a rod-shaped anchor member.
  • the surface pressure acting on the bottom arc piece 15b is uniform.
  • the groove 155 of the bottom arc piece 15b that fits into the anchor member 13 is short (Figs. 1 and 4). It is also preferable that the groove 155 of the bottom arc piece 15b does not exist at the lowest point Pb of the shell on the stern side of the bearing 10, which receives high loads.
  • the length of the anchor member 13 is 50% to 75% of the length of the bottom arc piece 15b (the length of the shell 11).
  • the anchor member 13 is arranged so that the bottom arc piece 15b is inserted from the stern side of the bearing 10 and fits into it.
  • the anchor member 13 in this example is structured to fit into the groove 155 of the bottom arc piece 15b, but it is also possible to structure the bottom arc piece 15b to have a convex rib portion and the anchor member 13 to have a groove that fits into the convex rib portion.
  • the arc piece 15 has a width with a predetermined arc length or chord length on the inner peripheral surface of the shell 11, and a length extending in the axial direction of the shell 11. Depending on its shape, the arc piece 15 is classified as a gap-type arc piece 15g or a closed arc piece 15p, as shown in FIG. 4.
  • the bearing 10 shown in FIG. 1(a) is an example in which the inner peripheral surface of the shell 11 is formed by a gap-type arc piece 15g.
  • FIG. 1(b) is an example in which the upper side of the inner peripheral surface of the shell 11 is formed by a gap-type arc piece 15g, and the lower side is formed by a closed arc piece 15p.
  • a bottom arcuate piece 15b is provided at the lowest point P B of the shell 11.
  • the bottom arcuate piece 15b can also be of a gap type (arc piece 15gb) or a closed type (arc piece 15pb).
  • the bottom arcuate piece 15b can be arranged symmetrically on the anchor member 13 in two bottom arcuate pieces 15b (15pb) (FIG. 3(a)), or in one bottom arcuate piece 15b (15pb) (FIG. 3(b)).
  • the bottom arcuate piece 15b can have a groove 155 that fits into the anchor member 13 at the bottom edge or bottom center of the bottom arcuate piece 15b.
  • the arc piece 15gm or arc piece 15pm (Figs. 1 and 2) that contacts the positioning plate 12 should be ground against the positioning plate 12.
  • the positioning plate 12 is made up of an upper plate 121 and a lower plate 122, so the arc piece 15 arranged on the upper side of the inner circumferential surface of the shell 11 is ground against the upper plate 121, and the arc piece 15 arranged on the lower side of the inner circumferential surface of the shell 11 is ground against the lower plate 122. Grinding refers to "a manual finishing process to create a highly accurate flat surface.
  • the surface is ground against a grinding table and finished by scraping with a scraper (Kojien).
  • This is a processing method that is described as “precision surface finishing by burnishing, precision surface finishing; mating by rubbing together (Weblio English-Japanese Dictionary/Japanese-English Dictionary: https://ejje.weblio.jp/content/%E6%93%A6%E3%82%8A%E5%90%88%E3%82%8F%E3%81%9B).
  • the arc piece 15 that contacts the positioning plate 12 is a closed arc piece 15pm, it is preferable to provide a notch 156 in the side edge that contacts the positioning plate 12, as shown in FIG. 4(d). This notch 156 can prevent the end surface of the sliding layer 153 from lifting up, and can suppress stress concentration and wear of the sliding layer 153.
  • the arc piece 15 is preferably made of a three-layer structure consisting of a sliding layer 153 with excellent abrasion resistance and heat resistance, an intermediate layer 152 made of an elastic body, and a base 151.
  • the base 151 can be made of metal or resin.
  • a copper alloy that has good machinability and excellent corrosion resistance can be used for the metal base 151.
  • a fiber-reinforced thermosetting resin, for example, carbon fiber-reinforced phenolic resin, can be used for the resin base 151.
  • the intermediate layer 152 is preferably an elastic body with a hardness (Shore A) of 50° to 95°.
  • nitrile rubber (NBR) with a hardness (Shore A) of 50° to 95° can be used.
  • NBR nitrile rubber
  • the intermediate layer is rubber
  • the three-layer structure is preferably formed by vulcanization adhesion. This allows for the formation of a strong adhesive structure.
  • Such an intermediate layer 152 can equalize the load from the drive shaft, suppress heat generation on the sliding surface of the sliding layer 153 of the drive shaft, and improve the wear resistance and durability of the arc piece 15.
  • the elastic deformation of the intermediate layer 152 is limited to the vertical direction as viewed from the rotation axis of the drive shaft. Therefore, no shear deformation acts on the joint surface between the sliding layer 153 and the intermediate layer 152, and deterioration of the adhesion portion between the sliding layer 153 and the intermediate layer 152 can be suppressed.
  • the sliding layer 153 is preferably a synthetic polymer compound containing fluorine atoms (F) in the molecule from the viewpoints of low friction, wear resistance, and heat resistance.
  • fluororesins such as polytetrafluoroethylene (PTFE) resin, tetrafluoroethylene-hexafluoropropylene copolymer (FEP) resin, and tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA) resin can be used.
  • PTFE polytetrafluoroethylene
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • PFA tetrafluoroethylene-perfluoroalkoxyethylene copolymer
  • polyamide resin or phenolic resin can be used.
  • the upper arc piece is formed from a gap-type arc piece, while the lower arc piece can be formed from a gap-type arc piece or a sealed arc piece.
  • the upper arc piece of the bearing is formed from an odd number of arc pieces so that the arc pieces are arranged symmetrically on the left and right of the arc piece at the top of the shell.
  • FIG. 5 is a schematic diagram showing the wear state of the bearing 10 during operation. Wear occurs on the lower arc piece of the bearing 10, especially around the lowest point Pb on the stern side.
  • the planar shape of the worn part W is a triangle that is larger on the stern side and gradually becomes smaller toward the bow.
  • the A-A cross-sectional shape of the worn part W has a smoothly descending slope with the lowest point Pb being the valley, with the most severe wear at the lowest point Pb. In this way, the wear of the bearing 10 is partial, with some parts barely worn. For this reason, when the worn part W of the bearing 10 reaches a predetermined wear state, the bearing 10 can be regenerated by rearranging the worn arc piece with the arc piece that is not worn or has hardly worn at all. The bearing 10 can be regenerated with the propeller shaft inserted.
  • the wear state of the bearing 10 is partial as described above, and it has a smooth inclined surface. For this reason, rather than rearranging the arc pieces individually, it is preferable to rearrange them in a group (set) to ensure continuity of the wear surface. If the arc pieces are rearranged to ensure continuity of the wear surface, it is possible to prevent steps from appearing on the sliding surface of the bearing due to a change in the order of the arc pieces. This makes it possible to prevent abnormal wear of the arc pieces and vibration of the drive shaft.
  • the rearrangement of the arc pieces 15 can be done, for example, by dividing the lower arc piece into two using the bottom arc piece 15b as a reference, and rearranging each into a group. That is, the lower arc pieces can be rearranged so that the right side of the lowest point Pb of the shell 11 is one group, and the left side of the lowest point Pb of the shell 11 is another group, with the axial directions (from the stern to the bow or fore-aft direction) reversed. In this case, the rearrangement is done as shown by the dashed line in Figure 5.
  • the less worn arc pieces 15 are arranged closer to the lowest point Pb of the inner surface of the shell 11, and the more worn arc pieces 15 are arranged farther from the lowest point Pb. That is, the bottom arc piece 15b is rearranged to the position furthest from the lowest point Pb of the shell 11.
  • the bearing for recycling should be rearranged for a group of arc pieces excluding the arc piece 15 (15gm, 15pm) that contacts the lower plate 122 of the positioning plate 12, taking into consideration that the arc piece 15 (15gm, 15pm) that contacts the lower edge of the positioning plate 12 (lower plate 122) is grounded against the lower plate 122.
  • the arc piece 15 that contacts the lower edge of the arc piece 15 that contacts the lower edge of the positioning plate 12 is arranged at the bottom arc piece position when the group of arc pieces is rearranged.
  • the arc piece 15 that contacts the lower edge of the arc piece 15 that contacts the lower edge of the positioning plate 12 is arranged as an arc piece that can be replaced with the bottom arc piece 15b.
  • This replaceable arc piece is used as a substitute arc piece for the bottom arc piece 15b.
  • Recycling bearings differ according to the type of bottom arc piece 15b of the bearing.
  • the substitute arc piece 15bl' on the right side has the same shape as the bottom arc piece 15bl, but is arranged in the opposite direction
  • the substitute arc piece 15br' on the left side has the same shape as the bottom arc piece 15br, but is arranged in the opposite direction.
  • the substitute arc pieces 15b' on the left and right sides have the same shape as the bottom arc piece 15b, but are arranged in the opposite direction.
  • the left and right sides of the bearing (10, 10A, or 10B) or arc piece 15 are defined based on the vertical axis VA of the cross section of shell 11.
  • the vertical axis refers to the axis in the opposite direction to the center of gravity of the propeller shaft, which is perpendicular to the horizontal axis, and the right side of the vertical axis is called the right side of the shell cross section.
  • the bearing is remanufactured as follows. First, the right substitute arc piece 15bl' to the bottom arc piece 15br are defined as the right arc piece group 15R, and the left substitute arc piece 15br' to the bottom arc piece 15bl are defined as the left arc piece group 15L. Next, the lower plate 122 is pulled out from the shell 11. Then, the right arc piece group 15R is pulled out as a group from the shell 11, the axial direction is reversed, and the group is re-arranged in the shell 11 as a group.
  • the left arc piece group 15L is pulled out as a group from the shell 11, the axial direction is reversed, and the group is re-arranged in the shell 11 as a group, and the arc pieces are rearranged.
  • the axial direction is the direction from the stern to the bow of the bearing.
  • the regeneration of the bearing is performed as follows.
  • the right-side substitute arc piece 15b' to the bottom arc piece 15b are defined as the right arc piece group 15R
  • the left-side substitute arc piece 15b to the arc piece 15 that is in contact with the bottom arc piece 15b are defined as the left arc piece group 15L.
  • the right-side substitute arc piece 15b' to the arc piece that is in contact with the bottom arc piece 15b are defined as the right arc piece group 15R
  • the left-side substitute arc piece 15b' to the bottom arc piece 15b are defined as the left arc piece group 15L.
  • the bottom arc piece 15b can be included in the right arc piece group 15R or the left arc piece group 15L, and this can be determined based on the state of the worn portion W.
  • the lower plate 122 is pulled out from the shell 11.
  • the right arc piece group 15R is pulled out of the shell 11 as a group, the axial direction is reversed, and the group is reinstalled in the shell 11 as a group.
  • the left arc piece group 15L is pulled out of the shell 11 as a group, the axial direction is reversed, and the group is reinstalled in the shell 11 as a group, and the arrangement of the arc pieces is changed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
PCT/JP2022/044167 2022-11-30 2022-11-30 船舶推進軸用の軸受及び軸受再生方法 Ceased WO2024116324A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2022/044167 WO2024116324A1 (ja) 2022-11-30 2022-11-30 船舶推進軸用の軸受及び軸受再生方法
JP2024561055A JP7792729B2 (ja) 2022-11-30 2022-11-30 船舶推進軸用の軸受及び軸受再生方法
GB2509085.3A GB2640080A (en) 2022-11-30 2022-11-30 Bearing for marine vessel propulsion shaft and bearing restoration method

Applications Claiming Priority (1)

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PCT/JP2022/044167 WO2024116324A1 (ja) 2022-11-30 2022-11-30 船舶推進軸用の軸受及び軸受再生方法

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195919A (en) * 1981-05-27 1982-12-01 Shinsaku Kaguchi Bearing for stern tube
JP3183964U (ja) * 2013-03-28 2013-06-06 オーツケミカル株式会社 船舶用割型軸受
KR20140075232A (ko) * 2012-12-11 2014-06-19 현대중공업 주식회사 선박용 프로펠러 축 지지장치
JP2019113099A (ja) * 2017-12-22 2019-07-11 三菱重工コンプレッサ株式会社 ジャーナル軸受、回転機械、及びジャーナル軸受製造方法
WO2021260965A1 (ja) * 2020-06-25 2021-12-30 株式会社ミカサ 船舶推進軸用の軸受

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3183964B2 (ja) * 1992-09-03 2001-07-09 株式会社クラレ 紙用コーティング剤

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195919A (en) * 1981-05-27 1982-12-01 Shinsaku Kaguchi Bearing for stern tube
KR20140075232A (ko) * 2012-12-11 2014-06-19 현대중공업 주식회사 선박용 프로펠러 축 지지장치
JP3183964U (ja) * 2013-03-28 2013-06-06 オーツケミカル株式会社 船舶用割型軸受
JP2019113099A (ja) * 2017-12-22 2019-07-11 三菱重工コンプレッサ株式会社 ジャーナル軸受、回転機械、及びジャーナル軸受製造方法
WO2021260965A1 (ja) * 2020-06-25 2021-12-30 株式会社ミカサ 船舶推進軸用の軸受

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GB202509085D0 (en) 2025-07-23
JPWO2024116324A1 (https=) 2024-06-06
GB2640080A (en) 2025-10-08
JP7792729B2 (ja) 2025-12-26

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