EP1208039B1 - Stern tube - Google Patents

Stern tube Download PDF

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Publication number
EP1208039B1
EP1208039B1 EP00937420A EP00937420A EP1208039B1 EP 1208039 B1 EP1208039 B1 EP 1208039B1 EP 00937420 A EP00937420 A EP 00937420A EP 00937420 A EP00937420 A EP 00937420A EP 1208039 B1 EP1208039 B1 EP 1208039B1
Authority
EP
European Patent Office
Prior art keywords
stern tube
tube
fastening means
ship
fixed part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00937420A
Other languages
German (de)
French (fr)
Other versions
EP1208039A1 (en
Inventor
Nils Bokedal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKANDIAVERKEN FLEXITUBE AB
Original Assignee
Skandiaverken Flexitube AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Skandiaverken Flexitube AB filed Critical Skandiaverken Flexitube AB
Priority to DK00937420T priority Critical patent/DK1208039T3/en
Publication of EP1208039A1 publication Critical patent/EP1208039A1/en
Application granted granted Critical
Publication of EP1208039B1 publication Critical patent/EP1208039B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H23/00—Transmitting power from propulsion power plant to propulsive elements
    • B63H23/32—Other parts
    • B63H23/36—Shaft tubes

Definitions

  • the present invention relates to a stern tube for ships, for enclosing a propeller shaft which extends between a propeller and a driving motor. More specifically, the invention relates to a stern tube comprising a tube having at least one interior bearing supporting the propeller shaft, a first fastening means which is fixedly connected to a fixed part of the ship and arranged on a part facing the propeller, and a second fastening means which is spaced apart from the first fastening means and connected to a second fixed part of the ship.
  • a stern tube comprising a tube having at least one interior bearing supporting the propeller shaft, a first fastening means which is fixedly connected to a fixed part of the ship and arranged on a part facing the propeller, and a second fastening means which is spaced apart from the first fastening means and connected to a second fixed part of the ship.
  • Stern tubes are used on large ships to enclose the propeller shaft which extends from a driving motor, through the ship hull and out to a propeller.
  • the stern tube is intended to stabilise the propeller shaft, while establishing a seal between the rotating propeller shaft and the fixed wall of the ship.
  • Conventional stern tubes are normally attached to a front and a rear fastening means by casting or the like. It is, however, difficult to adjust the stern tube to the propeller shaft, and in addition the stern tube is often somewhat deformed when being attached. As a result, after mounting of the stern tube, a great deal of adjustment work is normally required before the propeller shaft can be positioned.
  • the present invention relates to a stern tube for ships, for enclosing a propeller shaft, which extends between a propeller and a driving motor, comprising a tube having at least one interior bearing supporting the propeller shaft.
  • the stern tube comprises a first fastening means which is fixedly connected to a fixed part of the ship and arranged on a part facing the propeller, and a second fastening means which is spaced apart from the first fastening means and connected to a second fixed part of the ship.
  • the invention is distinguished in that the second fastening means allows axial displacement of the stern tube relative to the fixed part, but prevents displacement of the stern tube in the radial direction.
  • this can be provided by means of a holder part which has a sliding surface arranged against the tube wall.
  • the stern tube is allowed some degree of movability relative to the ship.
  • strains in the stern tube, due to the attachment to the ship, are avoided and there is some degree of adjustment to the propeller shaft in question.
  • this construction such adjustment can take place initially, during the mounting of the stern tube and the propeller shaft, as well as during subsequent use. Owing to this, uneven wear on the bearings is avoided, the wear thus being drastically reduced and the strength increased.
  • the mounting of the stern tube and its adjustment to the propeller shaft is also facilitated.
  • the second fastening means further allows pivoting of the stern tube relative to the fixed part of the ship.
  • the second fastening means comprising a holder frame which is attached to the fixed part of the ship and has an inner curved surface and a holder part which is arranged on the tube and has an outer surface with a corresponding curvature.
  • the possibilities of adjusting the stern tube are further increased, which further reduces the wear, thus increasing the strength.
  • the stern tube can, among other things, adjust to beating movements of the propeller shaft, which often occur and constitute an important reason for the wear on bearings and the like.
  • a stern tube according to the invention comprises a hollow-circular tube 1 adapted to enclose a propeller shaft 2.
  • the propeller shaft has an end 2a which is adapted to be connected to a propeller and an opposite end 2b which is adapted to be connected to a driving motor.
  • the tube may comprise several interconnected tube segments 1a-1c, and it also comprises at least one interior bearing 3 with a bearing surface supporting the propeller shaft.
  • the stern tube is connected with the aid of fastening means 5, 6 to fixed parts 4 of the ship, such as the hull, bulkheads or the like.
  • the stern tube comprises at least two fastening means which are spaced apart in the longitudinal direction of the tube, a first fastening means 5 being fixedly connected to a first fixed part 4a of the ship and arranged on a part facing the propeller, and a second fastening means 6 being spaced apart from the first fastening means 5 and connected to a second fixed part 4b of the ship.
  • the first fastening means 5 is a fixed connection between the stern tube and the fixed part of the ship, and may, for instance, be provided with the aid of mechanical fastening means, such as bolt joints 7, curing joining materials 8, such as epoxy, or preferably a combination thereof.
  • mechanical fastening means such as bolt joints 7, curing joining materials 8, such as epoxy, or preferably a combination thereof.
  • Other ways of providing a rigid connection are, however, possible, which is obvious to the one skilled in the art.
  • the second fastening means 6 allows axial displacement of the stern tube relative to the fixed part 4b, but prevents displacement of the stern tube in the radial direction.
  • the second fastening means comprising a holder part 9 which is arranged on the fixed part 4b of the ship and which, with a sliding surface, is arranged about and abuts against the tube lc.
  • the stern tube has an even and smooth outer surface in the area of the abutment of the holder part against the same.
  • the stern tube is allowed to slide relative to the holder part in the longitudinal direction of the tube, while being locked in the other directions.
  • the holder part also comprises, on its surface facing the tube, at least one indentation 10 in the form of a groove and a seal 11 arranged therein.
  • the stern tube in the area of the abutment of the holder part 9 against the same, further has a preferably circular cross-section which is constant in the longitudinal direction of the propeller shaft. Besides a movement in the axial direction of the tube relative to the holder, a turning movement between these parts is also allowed about the longitudinal axis, which further enhances the adjustability and reduces the wear on the bearings.
  • the holder part 9 is attached to the fixed part 4b of the ship by means of, on the one hand, a bolt joint 12 and, on the other hand, a curing material 13, such as an epoxy.
  • this material is arranged between parallel plane surfaces of the holder part and the fixed part, respectively. It is, however, also possible within the scope of the invention to use other ways of providing a fixed connection.
  • the holder part 9 and the fixed part 4b are connected to each other in a similar manner, but in this embodiment the curing material is arranged between surfaces which in cross-section have at least one and preferably two angles, preferably right angles. As a result, the connection will be more stable and firm.
  • the holder part also has a larger abutment surface facing the tube wall as well as two sealing rings 11.
  • the holder part 9 is connected to the fixed part 4b in a way similar to that in the second embodiment.
  • the holder part 9 in this embodiment comprises two parts: a holder frame 9a which is attached to the fixed part of the ship and which has an inner curved surface and a holder part 9b which abuts against the tube and which has an outer surface facing the holder frame and having a corresponding curvature.
  • the holder part 9b is adapted to be able to be arranged in the holder frame 9a, and the curvature is adapted to allow at least some degree of pivoting of the holder part 9a relative to the holder frame 9b but prevent displacement of the same in the longitudinal direction of the tube.
  • the curved surfaces have a spherical curvature.
  • the second fastening means in this embodiment, also allows pivoting of the stern tube relative to the fixed part of the ship.
  • a fixed attachment is provided in the aft position, which results in a completely fixed point and a forward point that is to some extent flexible. Owing to this, the mounting of the stern tube and the propeller shaft therein will be easier and more flexible.
  • the stern tube according to the invention adjusts to the shaft, on the one hand, initially when being mounted and, on the other hand, afterwards during operation. This results in better adjustment of the bearing load and thus enhanced strength of the bearing. Since the stern tube is not radially movable in the front fastening means either, relative to the fixed part of the ship, a satisfactory support is still provided for the propeller shaft.

Abstract

The present invention relates to a stern tube (1) for ships, for enclosing a propeller shaft (2) which extends between a propeller and a driving motor. More specifically, the invention relates to a stern tube comprising a tube having at least one interior bearing (3) supporting the propeller shaft, a first fastening means (5) which is fixedly connected to a fixed part (4a) of the ship and arranged on a part facing the propeller, and a second fastening means (6) which is spaced apart from the first fastening means and connected to a second fixed part of the ship. According to the invention, the second fastening means (6) allows axial displacement of the stern tube (1) relative to the fixed part (4b), but prevents displacement of the stern tube (1) in the radial direction.

Description

Technical Field
The present invention relates to a stern tube for ships, for enclosing a propeller shaft which extends between a propeller and a driving motor. More specifically, the invention relates to a stern tube comprising a tube having at least one interior bearing supporting the propeller shaft, a first fastening means which is fixedly connected to a fixed part of the ship and arranged on a part facing the propeller, and a second fastening means which is spaced apart from the first fastening means and connected to a second fixed part of the ship. Such a construction is shown for instance in US-A-5 310 372.
Background
Stern tubes are used on large ships to enclose the propeller shaft which extends from a driving motor, through the ship hull and out to a propeller. The stern tube is intended to stabilise the propeller shaft, while establishing a seal between the rotating propeller shaft and the fixed wall of the ship. Conventional stern tubes are normally attached to a front and a rear fastening means by casting or the like. It is, however, difficult to adjust the stern tube to the propeller shaft, and in addition the stern tube is often somewhat deformed when being attached. As a result, after mounting of the stern tube, a great deal of adjustment work is normally required before the propeller shaft can be positioned. Insufficient adjustment leads to oblique and uneven wear on the sliding bearings in the propeller shaft and the sliding bearings have to be changed or repaired. Movements in the ship, the stern tube and/or the propeller shaft during use also make the bearings of the fixedly and rigidly mounted stern tube get worn faster than expected. It is, for instance, common for propeller shafts to become distorted so that they "beat" which results in uneven and heavy wear on the sliding bearings.
Object of the Invention
Therefore, it is an object of the present invention to provide a stern tube which completely, or at least partly, solves the above-mentioned problems of prior-art stern tubes.
This object is achieved by means of the stern tube according to the appended claims.
Summary of the Invention
The present invention relates to a stern tube for ships, for enclosing a propeller shaft, which extends between a propeller and a driving motor, comprising a tube having at least one interior bearing supporting the propeller shaft. The stern tube comprises a first fastening means which is fixedly connected to a fixed part of the ship and arranged on a part facing the propeller, and a second fastening means which is spaced apart from the first fastening means and connected to a second fixed part of the ship. The invention is distinguished in that the second fastening means allows axial displacement of the stern tube relative to the fixed part, but prevents displacement of the stern tube in the radial direction. Preferably, this can be provided by means of a holder part which has a sliding surface arranged against the tube wall. In this manner, the stern tube is allowed some degree of movability relative to the ship. As a result, strains in the stern tube, due to the attachment to the ship, are avoided and there is some degree of adjustment to the propeller shaft in question. By this construction, such adjustment can take place initially, during the mounting of the stern tube and the propeller shaft, as well as during subsequent use. Owing to this, uneven wear on the bearings is avoided, the wear thus being drastically reduced and the strength increased. The mounting of the stern tube and its adjustment to the propeller shaft is also facilitated.
Preferably, the second fastening means further allows pivoting of the stern tube relative to the fixed part of the ship. This is advantageously achieved by the second fastening means comprising a holder frame which is attached to the fixed part of the ship and has an inner curved surface and a holder part which is arranged on the tube and has an outer surface with a corresponding curvature. As a result, the possibilities of adjusting the stern tube are further increased, which further reduces the wear, thus increasing the strength. By this construction, the stern tube can, among other things, adjust to beating movements of the propeller shaft, which often occur and constitute an important reason for the wear on bearings and the like.
Brief Description of the Drawings
Below, the invention will be described in more detail for the purpose of exemplification by means of embodiments and with reference to the accompanying drawings, in which:
  • Fig. 1 is a cross-sectional view of a stern tube according to che invention having a propeller shaft arranged therein;
  • Fig. 2 is a view on a larger scale of the portion marked II in Fig. 1;
  • Fig. 3 shows an alternative embodiment of a fastening means according to the invention; and
  • Fig. 4 shows a third embodiment of a fastening means according to the invention.
    • Description of Preferred Embodiments
    As shown in Fig. 1, a stern tube according to the invention comprises a hollow-circular tube 1 adapted to enclose a propeller shaft 2. The propeller shaft has an end 2a which is adapted to be connected to a propeller and an opposite end 2b which is adapted to be connected to a driving motor. The tube may comprise several interconnected tube segments 1a-1c, and it also comprises at least one interior bearing 3 with a bearing surface supporting the propeller shaft.
    The stern tube is connected with the aid of fastening means 5, 6 to fixed parts 4 of the ship, such as the hull, bulkheads or the like. The stern tube comprises at least two fastening means which are spaced apart in the longitudinal direction of the tube, a first fastening means 5 being fixedly connected to a first fixed part 4a of the ship and arranged on a part facing the propeller, and a second fastening means 6 being spaced apart from the first fastening means 5 and connected to a second fixed part 4b of the ship. The first fastening means 5 is a fixed connection between the stern tube and the fixed part of the ship, and may, for instance, be provided with the aid of mechanical fastening means, such as bolt joints 7, curing joining materials 8, such as epoxy, or preferably a combination thereof. Other ways of providing a rigid connection are, however, possible, which is obvious to the one skilled in the art.
    The second fastening means 6 allows axial displacement of the stern tube relative to the fixed part 4b, but prevents displacement of the stern tube in the radial direction. This is preferably achieved by the second fastening means comprising a holder part 9 which is arranged on the fixed part 4b of the ship and which, with a sliding surface, is arranged about and abuts against the tube lc. Moreover, it is an advantage if the stern tube has an even and smooth outer surface in the area of the abutment of the holder part against the same. As a result, the stern tube is allowed to slide relative to the holder part in the longitudinal direction of the tube, while being locked in the other directions. Advantageously, the holder part also comprises, on its surface facing the tube, at least one indentation 10 in the form of a groove and a seal 11 arranged therein.
    Preferably, the stern tube, in the area of the abutment of the holder part 9 against the same, further has a preferably circular cross-section which is constant in the longitudinal direction of the propeller shaft. Besides a movement in the axial direction of the tube relative to the holder, a turning movement between these parts is also allowed about the longitudinal axis, which further enhances the adjustability and reduces the wear on the bearings.
    In a first embodiment of the invention, which is shown in Fig. 2, the holder part 9 is attached to the fixed part 4b of the ship by means of, on the one hand, a bolt joint 12 and, on the other hand, a curing material 13, such as an epoxy. Here, this material is arranged between parallel plane surfaces of the holder part and the fixed part, respectively. It is, however, also possible within the scope of the invention to use other ways of providing a fixed connection.
    In a second embodiment, which is shown in Fig. 3, the holder part 9 and the fixed part 4b are connected to each other in a similar manner, but in this embodiment the curing material is arranged between surfaces which in cross-section have at least one and preferably two angles, preferably right angles. As a result, the connection will be more stable and firm. In this embodiment, the holder part also has a larger abutment surface facing the tube wall as well as two sealing rings 11.
    In a third and most preferred embodiment, the holder part 9 is connected to the fixed part 4b in a way similar to that in the second embodiment. However, this embodiment differs from the second embodiment in that the holder part 9 in this embodiment comprises two parts: a holder frame 9a which is attached to the fixed part of the ship and which has an inner curved surface and a holder part 9b which abuts against the tube and which has an outer surface facing the holder frame and having a corresponding curvature. The holder part 9b is adapted to be able to be arranged in the holder frame 9a, and the curvature is adapted to allow at least some degree of pivoting of the holder part 9a relative to the holder frame 9b but prevent displacement of the same in the longitudinal direction of the tube. Most preferably, the curved surfaces have a spherical curvature. Owing to this, the second fastening means, in this embodiment, also allows pivoting of the stern tube relative to the fixed part of the ship.
    By means of the stern tube according to the invention, a fixed attachment is provided in the aft position, which results in a completely fixed point and a forward point that is to some extent flexible. Owing to this, the mounting of the stern tube and the propeller shaft therein will be easier and more flexible. The stern tube according to the invention adjusts to the shaft, on the one hand, initially when being mounted and, on the other hand, afterwards during operation. This results in better adjustment of the bearing load and thus enhanced strength of the bearing. Since the stern tube is not radially movable in the front fastening means either, relative to the fixed part of the ship, a satisfactory support is still provided for the propeller shaft.
    The invention has now been described by means of an embodiment. It will, however, be appreciated that many variants of the invention are possible. It is, for instance, possible to provide the limited movability of the second fastening means in other ways. It is also possible to use the fastening means according to the invention in different types of stern tubes. Such variants as well as other obvious variants must be considered to fall within the scope of the invention such as delimited by the appended claims.

    Claims (8)

    1. A stern tube (1) for ships, for enclosing a propeller shaft (2), which extends between a propeller and a driving motor, comprising a tube having at least one interior bearing (3) supporting the propeller shaft (2), a first fastening means (5) which is fixedly connected to a fixed part (4a) of the ship and arranged on a part facing the propeller, and a second fastening means (6) which is axially spaced apart from the first fastening means (5) and connected to a second fixed part (4b) of the ship, characterised in that the second fastening means (6) allows axial displacement of the stern tube (1) relative to the fixed part (4b), but prevents displacement of the stern tube (1) in the radial direction.
    2. A stern tube as claimed in claim 1, wherein the second fastening means (6) comprises a holder part (9) which is arranged on the fixed part of the ship and which, with a sliding surface, is arranged about and abuts against the tube (1).
    3. A stern tube as claimed in claim 2, wherein the holder part (9) further comprises, on its surface facing the tube, an indentation (10) and a seal (11) arranged therein.
    4. A stern tube as claimed in claim 2 or 3, wherein the stern tube, in the area of the abutment of the holder part against the same, has a preferably circular cross-section which is constant in the longitudinal direction of the propeller shaft.
    5. A stern tube as claimed in any one of claims 2-4, wherein the stern tube, in the area of the abutment of the holder part (9) against the same, has an even and smooth outer surface.
    6. A stern tube as claimed in any one of the preceding claims, wherein the second fastening means (6) further allows rotation of the stern tube around its axis and relative to the fixed part of the ship.
    7. A stern tube as claimed in claim 6, wherein the second fastening means comprises a holder frame (9a) which is attached to the fixed part of the ship and has an inner curved surface and a holder part (9b) which is arranged on the tube and has an outer surface with a corresponding curvature, the holder part (9b) being adapted to be arranged in the holder frame (9a), and the curvature being adapted to allow at least some degree of rotation of the holder part relative to the holder frame but prevent displacement of the same in the longitudinal direction of the tube (1).
    8. A stern tube as claimed in claim 7, wherein the curved surfaces have a spherical curvature.
    EP00937420A 1999-05-31 2000-05-04 Stern tube Expired - Lifetime EP1208039B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    DK00937420T DK1208039T3 (en) 1999-05-31 2000-05-04 bow rudder

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    SE9902029A SE9902029L (en) 1999-05-31 1999-05-31 Shaft Sleeve
    SE9902029 1999-05-31
    PCT/SE2000/000867 WO2000073140A1 (en) 1999-05-31 2000-05-04 Stern tube

    Publications (2)

    Publication Number Publication Date
    EP1208039A1 EP1208039A1 (en) 2002-05-29
    EP1208039B1 true EP1208039B1 (en) 2004-07-21

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00937420A Expired - Lifetime EP1208039B1 (en) 1999-05-31 2000-05-04 Stern tube

    Country Status (14)

    Country Link
    EP (1) EP1208039B1 (en)
    JP (1) JP4618898B2 (en)
    KR (1) KR100475767B1 (en)
    CN (1) CN1112300C (en)
    AT (1) ATE271494T1 (en)
    AU (1) AU5259400A (en)
    DE (1) DE60012336T2 (en)
    DK (1) DK1208039T3 (en)
    HR (1) HRP20010886B1 (en)
    NO (1) NO325108B1 (en)
    PL (1) PL197398B1 (en)
    RU (1) RU2246424C2 (en)
    SE (1) SE9902029L (en)
    WO (1) WO2000073140A1 (en)

    Families Citing this family (10)

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    Publication number Priority date Publication date Assignee Title
    KR100767787B1 (en) * 2007-07-04 2007-10-17 지씨테크(주) Stern tube bush unit and method for mounting thereof
    KR100920059B1 (en) 2009-02-18 2009-10-07 선보공업주식회사 Stern tube bush unit and method for mounting thereof
    KR100977140B1 (en) 2010-05-13 2010-08-20 주식회사 와이엠피 Air tight resin of stern tube for ship construction apparatus and its construction method
    CN102009739A (en) * 2010-11-30 2011-04-13 惠生（南通）重工有限公司 Multiple bearings of elongated tailshaft
    CN102795330A (en) * 2012-08-28 2012-11-28 青岛华澳船舶制造有限公司 Propeller shaft pipe, ship and assembly method for propeller shaft pipe
    CN107310708A (en) * 2017-06-15 2017-11-03 中船黄埔文冲船舶有限公司 A kind of screw shaft of ship pipe device
    CN107200114A (en) * 2017-06-15 2017-09-26 中船黄埔文冲船舶有限公司 A kind of screw shaft of ship pipe device
    CN107380392A (en) * 2017-07-21 2017-11-24 苏州飞驰环保科技股份有限公司 The locking device of stern tube shaft after a kind of ship is stopped
    CN112158313A (en) * 2020-09-22 2021-01-01 广州文冲船厂有限责任公司 Tail shaft tube adjusting tool and using method
    CN114670989B (en) * 2022-04-29 2024-04-12 中船澄西扬州船舶有限公司 Ship stern tube mounting method

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    JPS5313187Y2 (en) * 1972-09-25 1978-04-10
    JPS56143199U (en) * 1980-03-28 1981-10-28
    US5310372A (en) * 1992-03-19 1994-05-10 The Evolution Company Inc. Through hull assemblies for marine drives

    Also Published As

    Publication number Publication date
    SE512512C2 (en) 2000-03-27
    RU2246424C2 (en) 2005-02-20
    DE60012336T2 (en) 2005-08-04
    JP2003500294A (en) 2003-01-07
    NO20015835D0 (en) 2001-11-29
    HRP20010886B1 (en) 2006-12-31
    NO325108B1 (en) 2008-02-04
    AU5259400A (en) 2000-12-18
    KR100475767B1 (en) 2005-05-09
    DK1208039T3 (en) 2004-11-01
    PL197398B1 (en) 2008-03-31
    CN1353655A (en) 2002-06-12
    CN1112300C (en) 2003-06-25
    PL351882A1 (en) 2003-06-30
    WO2000073140A1 (en) 2000-12-07
    SE9902029L (en) 2000-03-27
    KR20020009625A (en) 2002-02-01
    EP1208039A1 (en) 2002-05-29
    DE60012336D1 (en) 2004-08-26
    SE9902029D0 (en) 1999-05-31
    HRP20010886A2 (en) 2003-04-30
    NO20015835L (en) 2001-11-29
    JP4618898B2 (en) 2011-01-26
    ATE271494T1 (en) 2004-08-15

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