EP2698314A1 - Hélice démontable - Google Patents

Hélice démontable Download PDF

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Publication number
EP2698314A1
EP2698314A1 EP12006505.7A EP12006505A EP2698314A1 EP 2698314 A1 EP2698314 A1 EP 2698314A1 EP 12006505 A EP12006505 A EP 12006505A EP 2698314 A1 EP2698314 A1 EP 2698314A1
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EP
European Patent Office
Prior art keywords
hub
blades
propeller
propeller according
hub part
Prior art date
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Granted
Application number
EP12006505.7A
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German (de)
English (en)
Other versions
EP2698314B1 (fr
Inventor
Mehmet Nevres Ülgen
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.)
UELGEN, MEHMET, NEVRES
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Individual
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Filing date
Publication date
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Publication of EP2698314A1 publication Critical patent/EP2698314A1/fr
Application granted granted Critical
Publication of EP2698314B1 publication Critical patent/EP2698314B1/fr
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Classifications

    • 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
    • B63H1/20—Hubs; Blade connections

Definitions

  • Present invention relates to a marine vessel propeller comprising an even number of blades such as 4, 6, 8, which can be mounted or demounted to a hub made of two parts each having the half of the blades.
  • the blades can be rigidly connected to each other by means of connecting members.
  • propellers Propulsion required for the movement of marine vessels sailing afloat such as boats, ships and under water such as submarines is provided by propellers.
  • Propellers in general, consist of a central hub and plurality of blades combined with the hub.
  • the surfaces of the propeller blades are generally helicoidal and the flowing water is caught by the leading edge of the blade and compressed on the helicoidal surface to form a pressure and then it accelerates over the blade and leaves from the trailing edge.
  • the course of the fluid on blade surface, and hence the water compression on blade surface affect the amount of thrust to be obtained.
  • Propellers are conventionally cast in one piece and produced after being machined.
  • the blades are integrally produced with the hub.
  • This structure has some disadvantages: For example, blades, in general, are not allowed to overlap for the removal of the propellers from the cast mold, and for the surface machining after molding; and therefore such blades can get slightly higher than surface area ratio 1:1, generally being under value of 1 (e.g. 0,950).
  • Another disadvantage of the known propellers is that in case one of the blades is damaged due to mechanical fatigue, external impacts, or some ther reasons, the entire propeller needs to be replaced.
  • propellers having demountable blades have been introduced.
  • Such propellers are known to have some certain disadvantages such as having non-uniformly shaped blades.
  • each blade is likely to have different mass from one another when they are produced by casting which is widely-used in blade production. This would inevitably lead to a decrease in thrust performance of the propeller.
  • the material discontinuity that may occur inside the blade material during casting of the blade or the fact that the blade form cannot be always obtained in its same perfectness cause a balance problem in the propeller.
  • the connection of each blade to the hub may not be of the desired rigidity.
  • the blade-hub connection loses its rigidity because of the vibrations emerging in time, and therefore the blade-to-hub connection weakens and the propeller balance is negatively affected, as a result of which the thrust performance decreases.
  • the object of the present invention is to provide a propeller which has an increased performance and which can be produced relatively easily.
  • the present invention relates to a propeller comprising a cylindrical hub rotatable about an axis and a plurality of blades provided radially around the hub, wherein the hub is made up of a first part and a second part mounted to the first part in the axial direction, wherein the first part comprises a plurality of housings each having a relatively short space and a relatively long space, the housings provided circularly around the rotation axis; the second part comprises a plurality of protrusions each having a relatively short extension and a relatively long extension, the protrusions provided circularly around the rotation axis, and wherein the first part is rigidly mounted to the second part by a plurality of connecting members.
  • each hub part is integrally produced with its blades.
  • the housings of the first hub part extend from the surface where the first hub part is mounted to the second hub part in a way that they are located around the axis of the first hub part in an axial manner.
  • the protrusions of the second hub part extend from the surface where the second hub part is mounted to the first hub part in a way that they are located around the axis of the second hub part in an axial manner.
  • each housing and likewise the relatively short and relatively long extensions forming each protrusion are collaterally located. Therefore, while the first hub and the second hub are being combined, it is possible to fix one hub by rotating it slightly with respect to the other. Otherwise, it is not possible to fix one hub part without rotating it slightly with respect to the other one, as the blades will clash.
  • connection of the hub parts with each other is provided by means of preferably bolts and nuts. Therefore holes are provided around the rotation axis of the hub parts, all through the hub thickness.
  • the present invention comprises a propeller (1) to be used in moving a marine vessel in the sea, a hub (2) of cylindrical form rotatable about a rotation axis, and blades (4) which are arranged radially around the hub (2).
  • a shaft-fitting opening (15) at the center of the hub (2).
  • a shaft connected to the marine vessel motor from one end is inserted in the opening (15).
  • the hub (2) comprises a first hub part (2.1) and a second hub part (2.2) which can be connected to the first hub part (2.1).
  • Each hub part (2.1, 2.2) comprises a plurality of blades (4) which are produced preferably in one-piece form with the respective hub part.
  • the hub parts (2.1, 2.2) are mounted to one another by getting axially one closer to another. However, as it will be described in detail in the following, one of the hub parts is rotated slightly with respect to the other during the mounting process.
  • the first hub part (2.1) comprises a plurality of housings (7) comprising one relatively short space (5) and one relatively long space (6) which are provided around the axis of the hub circularly.
  • the housings (7) of the first hub part (2.1) extend axially from the surfaces (13) where the first hub part (2.1) and the second hub part (2.2) are connected, and the housings (7) being located around the first hub part (2.1).
  • the relatively short space (5) and the relatively long space (6) forming each housing (7) extend collaterally.
  • the second hub part (2.2) comprises a plurality of protrusions (10) each having a relatively short extension (8) and a relatively long extension (9), which are provided circularly around the axis of the hub.
  • the protrusions (10) of the second hub part (2.2) extend axially from the surfaces (14) where the second hub part (2.2) is combined with the first hub part (2.1), and the protrusions (10) being located around the axis of the second hub part (2.2).
  • the relatively short extension (8) and the relatively long extension (9) forming each protrusion (10) extend collaterally.
  • the contour of the inner surface of the housings (7) is in a perfect conformity with the contour of the outer surface of the protrusions (10); and when the hub parts (2.2, 2.1) are mounted to one another, the protrusions (10) are thoroughly fitted into the housings (7).
  • the hub parts (2.1, 2.2) are sometimes moved axially and sometimes rotated towards each other while they are being combined.
  • the spaces (5,6) of each housing (7) are formed as short and long, and the extensions (8,9) to be fitted into the spaces (5,6) are also formed as short and long.
  • a relatively long extension (9) of the second hub part (2.2) is aligned to a relatively short space (5) of the first hub part (2.1) in the axial direction; and then the second hub part (2.2) is moved towards the first hub part (2.1) in the axial direction, and therefore the relatively long extension (9) of the second hub part (2.2) tries to fit into the relatively short space (5) on the first hub part (2.1).
  • the other long extensions (9) of the second hub part (2.2) start to fit into the other short spaces (5) on the first hub part (2.1), because the protrusions (10) on the second hub part (2.2) and the housings (7) on the first hub part (2.1) have angularly synchronized positions about the rotational axis of the hub; and the number of protrusions (10) and housings (7) are the same.
  • the number of dents (10) is same with the number of blades on the second hub part (2.2), and likewise the number of housings (7) is same with the number of blades on the first hub part (2.1).
  • the relatively short extension (8) of the second hub part (2.2) rotates towards the direction where the relevant short space (5) on the first hub part (2.1) is located and therefore a sufficient axial gap is provided between the blades (4), and then the second hub part (2.2) is again moved towards the first hub part (2.1) in the axial direction.
  • These axial and rotational movements are continued until the relatively long extension (9) of the second hub part (2.2) is fitted into the corresponding long space (6) on the first hub part (2.1) and the relatively short extension (8) of the second hub part (2.2) is fitted properly into the corresponding relatively short space (5) on the first hub part (2.1).
  • the relatively short extension (8) and the relatively long extension (9) together define a step-like form, and likewise the relatively short space (5) and the relatively long space (6) together define a step-like form which provides an advantageous structure for the hub parts (2.1, 2.2) to be combined with each other more rigidly. Because the step-like form defines the connection surfaces (13, 14) of the hub parts (2.1, 2.2) which are orthogonal to the hub rotational axis, and holes (12) for connecting members are formed which extend through the hub (2) running from the connection surfaces (13, 14) of each hub part (2.1, 2.2).
  • the holes (12) are formed through both the first hub part (2.1) and the second hub part (2.2); and when the first hub part (2.1) is combined with the second hub part (2.2), this is aligned with the holes (12).
  • a connecting member (11) such as a bold is located into each hole (12).
  • This connecting member (11) may be a stud bolt, the body of which is cylindrical flat, with a screwed-end and having a nut; and the mechanical rigidity of this bolt connection is provided by means of a corresponding nut (19).
  • the connecting member (11) operates (for example when the bolt is tightened), a rigid connection is provided between the first hub part (2.1) and the second hub part (2.2) with the high friction force generated on the connection surfaces (13,14) of the hub parts (2.1, 2.2).
  • the step-like form defines power transmission surfaces (18) around the hub (2) axis, which extend through this axis and which are in contact with each other. In addition to the above-mentioned friction force, by means of the power transmission surfaces (18) which are in contact with each other, the power transmission between the first hub part (2.1) and the second hub part (2.2) is contributed.
  • a conical hub case (16) is attached to the front part of the propeller (1) facing the water, in a way that it will cover the diameter of the hub; and this case (16) is fitted to the hub (2) by means of bolts (20).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP12006505.7A 2012-08-16 2012-09-17 Hélice démontable Active EP2698314B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR201209582 2012-08-16

Publications (2)

Publication Number Publication Date
EP2698314A1 true EP2698314A1 (fr) 2014-02-19
EP2698314B1 EP2698314B1 (fr) 2016-08-10

Family

ID=46980690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12006505.7A Active EP2698314B1 (fr) 2012-08-16 2012-09-17 Hélice démontable

Country Status (1)

Country Link
EP (1) EP2698314B1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56167593A (en) * 1980-05-27 1981-12-23 Tokichi Toyoshima Screw propeller for ship
JP2000247293A (ja) * 1999-03-02 2000-09-12 Yukio Nakamura インペラ−
WO2004000640A1 (fr) * 2002-06-25 2003-12-31 Ab Volvo Penta Helice marine de traction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56167593A (en) * 1980-05-27 1981-12-23 Tokichi Toyoshima Screw propeller for ship
JP2000247293A (ja) * 1999-03-02 2000-09-12 Yukio Nakamura インペラ−
WO2004000640A1 (fr) * 2002-06-25 2003-12-31 Ab Volvo Penta Helice marine de traction

Also Published As

Publication number Publication date
EP2698314B1 (fr) 2016-08-10

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