EP3523193B1 - A propeller for a marine vessel and a method of installing the hub cap to the hub - Google Patents
A propeller for a marine vessel and a method of installing the hub cap to the hub Download PDFInfo
- Publication number
- EP3523193B1 EP3523193B1 EP16774961.3A EP16774961A EP3523193B1 EP 3523193 B1 EP3523193 B1 EP 3523193B1 EP 16774961 A EP16774961 A EP 16774961A EP 3523193 B1 EP3523193 B1 EP 3523193B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hub
- propeller
- hub cap
- recited
- connection ring
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 10
- 230000004323 axial length Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
- 238000009434 installation Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H3/00—Propeller-blade pitch changing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/28—Other means for improving propeller efficiency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B2221/00—Methods and means for joining members or elements
- B63B2221/08—Methods and means for joining members or elements by means of threaded members, e.g. screws, threaded bolts or nuts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/28—Other means for improving propeller efficiency
- B63H2001/283—Propeller hub caps with fins having a pitch different from pitch of propeller blades, or a helix hand opposed to the propellers' helix hand
Definitions
- the present invention relates to a novel propeller for a marine vessel and a method of installing the hub cap to the hub. More specifically, the present invention relates to hub caps for use in connection with both fixed pitch and controllable pitch propellers.
- the propulsion unit of a marine vessel comprises normally a hub and propeller blades arranged to the hub.
- the hub comprises drive means, which may, for instance, be a drive shaft, an angle gear, a transmission or an electric or hydraulic drive.
- the propeller may be a so called fixed pitch propeller (FPP) or a controllable pitch propeller (CPP).
- FPP fixed pitch propeller
- CPP controllable pitch propeller
- the former one has blades fastened to an annular hub body, and the latter one has blades arranged to means for controlling the pitch of the blades, the control means being located within the hub of the propulsion unit.
- the means for controlling the pitch of the propeller blades comprise actual mechanical turning arrangement arranged in the hub, and means for actuating the mechanical turning arrangement.
- the mechanical turning arrangement comprises a crank ring for each propeller blade.
- actuating means i.e. a mechanical one and a hydraulic one.
- the mechanical one comprises a rod extending along a central bore in the drive shaft from the drive means to the inside of the hub.
- the hydraulic actuating means the movable member inside the hub is arranged to work as a piston in a hydraulic cylinder.
- a problem concerning the propellers is the relatively large diameter the roots of the propeller blades are arranged.
- the large diameter of the hub results in that the propeller hub forms a hydrodynamically inefficient object, as the flow exiting the propeller blades has to fill the open cavity downstream of the hub.
- the hub terminating to a substantially radial surface having a diameter corresponding to the hub diameter creates, downstream of the hub, an area of reduced pressure, which, in practice, means the creation of a force directed opposite to the thrust of the propeller, i.e. reducing the net thrust of the propeller.
- While water fills the open cavity a so called hub vortex is created.
- the hub vortex is visible in its more intense form, when the vortices start cavitating, i.e. form gas bubbles in the vortex.
- the practical problem with the hub vortex is that it reduces considerably the applicable thrust of the propeller. Naturally, the problem may be seen in a larger scale in the controllable pitch propellers, due to their larger hub
- the problem relating to the hub vortex has been attempted to be solved by arranging a hub cap to the downstream end of the hub, and fins on the hub cap, both the hub cap and the fins rotating together with the propeller.
- the hub cap may be a cylindrical extension of the hub, but normally it is a converging extension.
- the convergence may be either conical or curved.
- a hub cap positioned on the downstream end of a propeller is disclosed in KR 10-2015-0102851 .
- the hub cap When the propeller is of the fixed pitch type, or sometimes even a controllable pitch type, the hub cap may be easily fastened from inside thereof to the end of the hub as discussed in a co-pending patent application PCT/EP2016/058311 . But when the propeller is a controllable pitch propeller having hydraulic actuating means with their hydraulic cylinder arranged at the aft end of the propeller hub, i.e. the end opposite the drive or forward end of the hub, either as an integral part of the hub or as a separate part attached to the aft end of the hub a further problem may be seen.
- the hub cap is preferably arranged to cover the radial difference by means of a more or less streamlined surface converging from the maximal diameter of the hub backwards.
- the hub body has an axial extension at its aft end with a diameter smaller than that of the rest of the hub body, the axial extension filling the interior of the hub cap.
- the hub cap is formed of the converging section provided with fins on its outer surface.
- the converging section of the hub cap has, at its end facing the aft end of the hub, an inwardly extending flange provided with holes for bolts or screws used for fastening the hub cap to the hub.
- the fastening of the hub cap is easy to perform from inside the hub cap.
- the interior of the hub cap is more or less filled with the axial extension of the hub body, the fastening of the hub cap from inside is impossible.
- an object of the present invention is to design a novel hub cap, which has a simple construction resulting in low costs of manufacture.
- Another object of the present invention is to design a novel hub cap, which has a light construction and easy installation.
- a further object of the present invention is to design a novel hub cap that may be fastened at the aft end of the hub from outside of the hub cap.
- a still further object of the invention is to offer a possibility to provide existing propellers with a modern hub cap.
- a propeller for a marine vessel comprising a hub with a hub body, propeller blades, and a hub cap attached to an aft end of the hub body, the hub cap having an outer surface provided with fins, wherein the hub cap is fastened to the hub body by means of a separate circular connection ring coaxial with the hub body, the connection ring is fastened to the inside of the hub cap by means of dowels pressed in coaxial radial holes in the hub cap and in the connection ring, respectively, the hole in the hub cap has a threaded section and the hole is closed and sealed by means of a plug threaded in the threaded section of the hole.
- At least one of the objects of the invention is substantially met by a method of installing a hub cap on an aft end of a hub of a propeller, the propeller comprising a hub with a hub body, propeller blades and a hub cap, the hub cap having an outer surface provided with fins and an inner surface having an inner diameter, the method comprising the steps of
- the present invention brings about the following advantages, among others
- FIG. 1 illustrates an axial cross sectional view of a hub 10 of a prior art controllable pitch propeller of a marine vessel.
- 'aft' and 'forward' have been used such that 'aft' refers to an element or part of an element facing or pointing towards the aft end or stern of a vessel, and 'forward' refers to an element or part of an element facing or pointing towards the front end or bow of a vessel.
- the hub 10 comprises a hub body 12, an aft end cover 14 at an aft end of the hub body 12, a forward end cover 16 at a forward end of the hub body 12, a cylinder yoke 18, crank rings 20, propeller blades 22 and a hub cap 24.
- the forward end cover 16 at the forward end of the hub body 12 has an opening for receiving the drive shaft that extends to the central cylindrical opening 26 in the cylinder yoke 18.
- the drive shaft (not shown) is provided with a flange that is bolted to the threaded holes 28 at the forward end of the hub body 12 for rotating the hub body 12.
- the drive shaft is provided with means fastened to the opening 30 in the cylinder yoke 18 for moving the cylinder yoke 18 axially. While the cylinder yoke 18 is moved axially, it cooperates with the crank rings 20 for controlling the pitch of the propeller blades 22.
- the aft end cover 14 is fastened to the aft end of the hub body 12 by means of bolts 32.
- the hub cap 24 of the prior art hub 10 is formed, between its forward and aft axial ends, of a converging section 34 to the outer surface of which fins 36 are fastened.
- the converging section 34 of the hub cap 24 is provided at its forward end with a flange 38 extending radially inwardly along the aft end cover 14 of the hub and fastened thereon by means of bolts or screws 40.
- FIG. 2 illustrates schematically an axial cross section of a hub in accordance with a first preferred embodiment of the present invention.
- the hub 40 comprises a hub body 42, which is, for instance, fastened to a flange 44 arranged at an end of the drive shaft 46.
- the hub has a plurality of propeller blades 48 rotatably arranged by means of attaching each blade 48 via its blade foot 50 to a rotatable crank ring 52 of its own, preferably by means of bolts.
- the blade foot 50 and/or the crank ring 52 has/have been sealed in relation to the hub body 42 such that oil used for lubricating the interior of the hub, i.e. the mechanical pitch control means, does not leak to the water surrounding the hub, when in operation.
- the interior of the hub 40 is provided with hydraulic means for controlling the pitch or for changing the blade angle of the propeller, i.e. for changing the blade angle position between an ahead and an astern position as was already mentioned in connection with Figure 1 .
- the hub 40 is provided with an axial extension, i.e. an aft end cover 54, fastened via a radially extending flange 56 thereof to the aft end of the hub body 42.
- the interior of the aft end cover 54 is provided with a piston 58 dividing the cylindrical interior volume of the aft end cover 54 to two chambers, i.e. an astern oil chamber 60 and an ahead oil chamber 62.
- FIG. 2a also shows the hub cap 66 having fins 68, the hub cap 66 being fastened by fastening means 70 to the hub body 42.
- FIG 2b illustrates Detail A, i.e. the fastening means 70, of Figure 2a in an enlarged scale.
- the fastening means 70 are formed of a circular connection ring 72 attached coaxially to the hub body 42 by means of stud bolts 74 screwed to blind threaded axial holes 78 in the heads of the bolts 76.
- the outer diameter of the circular connection ring 72 is equal with the inner diameter of the hub cap 66 and the circular connection ring has a radial width and an axial thickness appropriate for its function, i.e. for supporting the hub cap on the aft end of the hub body.
- connection ring 72 In place of headless stud bolts also ordinary bolts, like for instance bolts with a hexagonal head may be used.
- heads of the bolts 76 are arranged below the aft end surface of the aft end cover 54 distance rings 80 are used to raise the position of the connection ring 72 to the support of the stud bolts 74 and distance rings 80 only.
- the connection ring 72 is pressed against the distance rings 80 and the heads of the bolts 76 by means of locking rings 82 and nuts 84 screwed on the stud bolts 74.
- the connection ring 72 has radial holes 86, preferably, but not necessarily blind holes, extending from the outer circumference of the connection ring 72 towards the inner circumference thereof.
- the hub cap 66 is provided with through holes 88 arranged such that their axes coincides with those of the holes 86 in the connection ring 72. In other words the distance of the axes of the holes 86 and 88 from the aft end surface of the hub body 42 is the same, and the number and position of the holes 86 and 88 in the circumference of the hub cap 66 and the connection ring 72 are the same.
- the hub cap 66 is attached to the connection ring 72 by means of dowels 90 pressed in the holes 88 and 86.
- the hole 88 in the hub cap 66 is provided with a threaded section 92 for a threaded plug 94, which is threaded in the threaded section 92 of the hole 88.
- the plugs 94 are needed to prevent the dowels from exiting the holes due to centrifugal force acting on the dowels when the propeller is running.
- connection ring 72 having an outer diameter corresponding to the inner diameter of the hub cap 66 and a radial dimension extending to cover the bolts 76 is provided with axial holes 96 having the same dimensioning (the same number of holes with the same spacing on the same circumference) with the blind holes 78 in the bolts 76.
- the connection ring 72 is also provided with radial holes 86, preferably but not necessarily, in the same drilling phase with the radial holes 88 of the hub cap 66.
- FIG 3a illustrates schematically the hub 40' and the hub cap 42' in accordance with a second preferred embodiment of the present invention.
- the basic construction of the hub is, in relation to the present invention, quite the same as in the first embodiment discussed in Figures 2a and 2b .
- the only difference in view of the present invention may be seen in the hub body 42' as the hub body of this embodiment does not have the axial extension as a separate aft end cover but such, i.e. the part of the hub containing the hydraulic cylinder, is an integral part of the hub body 42'.
- the hub cap 66' is fastened to the aft end of the hub body by fastening means 70', which are shown in Detail B, illustrated in an enlarged scale in Figure 3b .
- connection ring 72' When preparing for the installation of a hub cap 66' on the aft end of the hub body 42' of Figure 3a , a connection ring 72' is manufactured such that its outer diameter corresponds to the inner diameter of the hub cap 66' and that it has sufficient thickness in both radial and axial directions. Thereafter the connection ring 72' is provided with a desired number of axial through holes 96' arranged, preferably but not necessarily, at equal intervals, for instance 20 holes arranged 18 degrees apart from one another on the same radius from the axis of the connection ring. Next, the distance ring 72' is provided with radial blind holes 84' in its outer circumference. Again the holes 86' are, preferably but not necessarily, at equal intervals in the distance ring 72'.
- connection ring 72' is brought into communication with the hub body 42' to be used as a drilling template.
- the connection ring 72' is provided with at least three specific alignment tools for centralizing the ring 72' in relation to the hub body 42', and blind axial holes 78' are drilled in the hub body 42', whereby it is ensured that the holes 96' in the connection ring 72' and the holes 78' in the hub body match one another. And finally the blind holes 78' in the hub body 42' are threaded.
- connection ring 72' is fastened to the hub body 42' by means of bolts 74', if desired together with locking rings.
- the hub cap 66' which is provided with radial through holes 88', possibly simultaneously with the drilling of the blind radial holes 86' in the connection ring 72', is positioned on the connection ring 72' and dowels 90 are pressed in the holes 88' and 86'.
- the hole 88' in the hub cap 66' which is provided with a threaded section 92', is closed with a threaded plug 94', and preferably sealed in relation to the aft hub cap 66' with an O-ring.
- the plugs 94' are needed, on the one hand, to prevent any water from entering the holes and corroding the holes and/or the dowels therein and, on the other hand, to prevent the dowels from exiting the holes due to centrifugal force acting on the dowels when the propeller is running.
- the hub cap is installed to the aft end of the hub body such that its opposite end, i.e. the aft end thereof, facing away from the hub body is not closed at all but the hub cap has a general shape of a truncated converging shell having an open interior.
- the interior of the hub cap is, for the most part thereof, closed by means of the axial extension, i.e. the aft end cover of the hub body or the hub body itself.
- the axial length of the hub cap is smaller than that of the axial extension.
- the hub cap covers the axial extension only partially, whereby the hub cap leaves, at its aft end, a gap between itself and the axial extension, the gap being, preferably but not necessarily, of the order of 10 - 30 mm, preferably approximately 20 mm.
- the main reason for such a gap is that at least the axial extension, maybe also the hub cap, is made by casting whereby the surface quality does not allow any closer gap. Furthermore such a gap is considered appropriate to ensure free water circulation, i.e. efficient flushing of the interior of the hub cap.
- the hub cap extends to the full axial length of the axial extension, whereby a similar gap as above is left between the axial extension and the hub cap.
- the hub cap extends farther away from the hub than the axial extension. In such a case, again a similar gap is left between the interior surface of the hub cap and the outermost edge of the axial extension.
- the stud bolts used for fastening the connection ring 72 of Figures 2a and 2b to the aft end of the hub body 42 i.e. to the fastening bolts 76 may be replaced with ordinary hexagonal head bolts, whereby the use of one or more separate guide pins for facilitating the installation of the connection ring on the aft end of the hub body is preferred.
- the guide pins may be used in connection with the use of the stud bolts, too.
- the dowels 90 and 90' are preferably provided with a central threaded blind hole, or some other appropriate means, facilitating the dismounting of the dowels when the hub cap is to be removed from the hub.
- connection ring may be replaced with ring sectors comprising at least two holes for the fastening bolts, or with separate connection members, one for each fastening bolt.
- the sectors or separate connection members or in fact the outer circumferential surface thereof, coaxial with the hub body, the use of a full one-part ring is the most preferred option due to the easy positioning thereof.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2016/073625 WO2018065032A1 (en) | 2016-10-04 | 2016-10-04 | A propeller for a marine vessel and a method of installing the hub cap to the hub |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3523193A1 EP3523193A1 (en) | 2019-08-14 |
EP3523193B1 true EP3523193B1 (en) | 2020-12-02 |
Family
ID=57044975
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16774961.3A Active EP3523193B1 (en) | 2016-10-04 | 2016-10-04 | A propeller for a marine vessel and a method of installing the hub cap to the hub |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3523193B1 (ko) |
JP (1) | JP6600119B2 (ko) |
KR (1) | KR102134548B1 (ko) |
CN (1) | CN109803885B (ko) |
WO (1) | WO2018065032A1 (ko) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE459675A (ko) * | ||||
BE537325A (ko) * | 1954-04-13 | |||
ES2049027T3 (es) * | 1989-03-21 | 1994-04-01 | Marine Propeller Srl | Helice de palas orientables con ajuste manual del paso. |
CN2214354Y (zh) * | 1994-08-18 | 1995-12-06 | 中国船舶工业总公司第七研究院第七○八研究所 | 带适进流鳍板的螺旋桨桨帽 |
FR2929668B1 (fr) * | 2008-04-04 | 2012-10-19 | Peugeot Citroen Automobiles Sa | Vis de fixation a butee reglable utilisable notamment dans un vehicule automobile |
CN201362357Y (zh) * | 2009-02-20 | 2009-12-16 | 南京高精船用设备有限公司 | 船舶用推进器桨毂 |
DE102011055515A1 (de) * | 2011-11-18 | 2013-05-23 | Becker Marine Systems Gmbh & Co. Kg | Propelleranordnung, insbesondere für Wasserfahrzeuge |
KR20140030830A (ko) * | 2012-09-04 | 2014-03-12 | 이경완 | 선박 보조 추진기 연결 장치 |
US9718529B2 (en) * | 2013-03-15 | 2017-08-01 | Brunswick Corporation | Transmission for marine propulsion |
KR20150102851A (ko) * | 2014-02-28 | 2015-09-08 | 삼우중공업(주) | 선박의 아지무스 추진장치 |
CN206623979U (zh) * | 2017-03-06 | 2017-11-10 | 上海交通大学 | 液压推进器桨毂连接轴结构 |
-
2016
- 2016-10-04 WO PCT/EP2016/073625 patent/WO2018065032A1/en unknown
- 2016-10-04 CN CN201680089730.0A patent/CN109803885B/zh active Active
- 2016-10-04 EP EP16774961.3A patent/EP3523193B1/en active Active
- 2016-10-04 JP JP2019517945A patent/JP6600119B2/ja active Active
- 2016-10-04 KR KR1020197012785A patent/KR102134548B1/ko active IP Right Grant
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP3523193A1 (en) | 2019-08-14 |
WO2018065032A1 (en) | 2018-04-12 |
KR102134548B1 (ko) | 2020-07-16 |
CN109803885A (zh) | 2019-05-24 |
CN109803885B (zh) | 2021-02-02 |
KR20190057375A (ko) | 2019-05-28 |
JP2019529238A (ja) | 2019-10-17 |
JP6600119B2 (ja) | 2019-10-30 |
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