EP2217486A1 - Boat propeller having adjustable surface cutting propeller blades - Google Patents

Boat propeller having adjustable surface cutting propeller blades

Info

Publication number
EP2217486A1
EP2217486A1 EP08767242A EP08767242A EP2217486A1 EP 2217486 A1 EP2217486 A1 EP 2217486A1 EP 08767242 A EP08767242 A EP 08767242A EP 08767242 A EP08767242 A EP 08767242A EP 2217486 A1 EP2217486 A1 EP 2217486A1
Authority
EP
European Patent Office
Prior art keywords
propeller
propeller blade
blade carriers
carriers
blade
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.)
Withdrawn
Application number
EP08767242A
Other languages
German (de)
French (fr)
Other versions
EP2217486A4 (en
Inventor
Torbjörn Eriksson
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.)
Stormfageln AB
Original Assignee
Stormfageln 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 Stormfageln AB filed Critical Stormfageln AB
Publication of EP2217486A1 publication Critical patent/EP2217486A1/en
Publication of EP2217486A4 publication Critical patent/EP2217486A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/02—Propeller-blade pitch changing actuated by control element coaxial with propeller shaft, e.g. the control element being rotary
    • B63H3/04—Propeller-blade pitch changing actuated by control element coaxial with propeller shaft, e.g. the control element being rotary the control element being reciprocatable

Definitions

  • the present invention relates to a boat propeller hub for a boat propeller having surface-cutting propeller blades, comprising a hub housing, which supports at least two essentially diametrically opposed propeller blade carriers.
  • the object of the present invention is in general to provide a propeller hub of the type stated in the introduction, which is specially tailored to propellers for fast boats having engines with high power and high maximum torque, for example turbo diesels, and which eliminates the need to use a high-pressure turbocharger or a mechanical compressor serially connected to the turbocompressor, as is nowadays required in turbocharged engines connected to fixed-blade propellers to raise sufficient charge pressure and torque at low revs to be able to accelerate the boat to planing speed.
  • the object is to provide a propeller hub of this type, having a blade resetting mechanism which, over a long operating period, withstands the loads to which it is subjected during use, together with surface-cutting propeller blades and high-power and high-torque engines.
  • a further object is here to provide a propeller hub for adjustable surface- cutting propeller blades, which is specially configured to be able to bear and regulate a large number of adjustable propeller blades, for example as many as ten blades or more on larger vessels.
  • the hub housing in its peripheral limit surface, has circular openings, in which the propeller blade carriers are rotatably mounted in bearing races in the openings and to which the radially inner portion of the propeller blades can be connected, and that the propeller blade carriers are rotatable by means of an elongated blade resetting element, which is axially displaceable in a hollow shaft connected to the hub housing and by means of which the said propeller blade carriers can be rotated relative to the hub housing via a lever and link system connected to the blade resetting element and to the propeller blade carriers.
  • the blades when the boat is started from stationary, can be set at a small pitch, so that the engine speed rapidly reaches a speed at which even a low-pressure turbocharger produces sufficient charge pressure to yield an engine torque which is enough, when the pitch is subsequently successively increased, to accelerate the boat to planing speed.
  • the hub housing supports at least two pairs of propeller blades which are diametrically opposed in pairs.
  • An annular element can mutually connect all the propeller blade carriers in such a way that the rotary motion of the propeller blade carriers connected to the said blade resetting element is converted into rotary motion of the other propeller blade carriers via the annular element.
  • the annular element may connect the propeller blade carriers via articulated connecting members.
  • Fig.1 shows a diagrammatic, partially cut-open perspective view of an embodiment of a propeller hub according to the invention, having two propeller blades and mounted on a drive shaft,
  • Fig. 2 shows a perspective view of the link and lever mechanism of the hub in Fig. 1, in an embodiment for five pairs of propeller blades, and
  • Fig. 3 shows a perspective detailed view of a part of the link mechanism in Fig. 1 and 2.
  • the propeller hub comprises a hub housing 1 consisting of a cylindrical drum 2, a front conical cap 3 and a rear (not shown) cap intended to be screwed to the rear edge face 4 of the drum.
  • the hub housing 1 is non-rotatably fixed via the conical cap 3 to a drive shaft in the form of a hollow shaft 5.
  • a tubular slide 6 is mounted in an axially displaceable manner.
  • the drum 2 of the hub housing is in this case configured with ten peripherally evenly distributed circular openings 7, the edge faces 8 of which form bearing surfaces for cylindrical propeller blade carriers 9 rotatably mounted in the openings 7.
  • Fig. 1 for the sake of simplification, only two propeller blade carriers 9 for a pair of diametrically opposed propeller blades 10 are shown.
  • a shaft 11 (half-shown in Fig. 1) extends diametrically through the drum 2 and is connected at its ends to the inner side of the drum.
  • two sleeves 12 (one shown in Fig. 1) are rotatably mounted on the shaft 11 .
  • a lever 13 is rigidly connected to each sleeve 12. As can be seen from Fig. 2, the levers are oppositely directed to one another.
  • the sleeves 12 are, in turn, non-rotatably connected to one each of the two diametrically opposed propeller blade carriers 9.
  • the shaft 11 is thus rotatably connected to the inner side of the drum through the sleeves 12 and the propeller blade carriers 9.
  • the opposing propeller blade carriers 9 will be rotated in their openings 7 in the drum via the link arms 14 and the levers 13. Since the levers 13 are oppositely directed, the two diametrically opposed propeller blade carriers 9 with associated propellers 10 will be rotated in opposite directions.
  • a complete hub housing is shown, having a lever and link mechanism for five pairs of propellers.
  • Fig. 3 shows a perspective detailed view of a part of the link mechanism.
  • To each propeller blade carrier 9 is screwed one end of a link arrangement 15, the other end of which is articulately connected via a bushing 16 to an annular element 17.
  • the link arrangement 15 consists of two legs 18 and 19, connected to one another in a V-shape, of which the leg 19 is screwed to the leg 18 and consists of two parts 19a and 19b, which are connected to one another by means of a threaded joint with locking nut 19c and thereby allow length adjustment and exact adaptation of the length of the leg 19 to the length of the leg 18.
  • the leg 18 is adjusted with the elements 19e, 19f.
  • the annular element 17 is provided on its outer side with guide lugs 20, which run up against an annular, concentrically surrounding guide rail 21 for guiding the annular element 17 during its rotation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Harvester Elements (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

Propeller hub for a boat propeller having surface-cutting propeller blades, comprising a hub housing having rotatable propeller blade carriers and a resetting mechanism having a lever and link system for rotation of the propeller blade carriers.

Description

Boat propeller having adjustable surface cutting propeller blades
The present invention relates to a boat propeller hub for a boat propeller having surface-cutting propeller blades, comprising a hub housing, which supports at least two essentially diametrically opposed propeller blade carriers.
It is a known fact that surface-cutting propellers, i.e. of the kind which, in the planing position of the boat, lie with their rotational axis substantially in the water surface, can be more effective for the propulsion of very fast motor boats than conventional propellers which operate with all the blades fully submerged in water. To date, however, surface-cutting propellers have only gained limited practical use as propellers with fixed blades, despite the fact that in certain applications, for example in combination with engines which are optimized for a narrow rotation speed range, obvious advantages exist with adjustable blades, which allow the pitch of the blades to be adapted in such a way that the engine can operate within its optimal rotation speed range within a greater speed range of the boat.
When the speed of the boat is constant, the blades on a conventional propeller, which operate fully submerged in water, are subjected to forces which are broadly constant. The blades of a surface-cutting propeller, on the other hand, are subjected to large and highly frequent force variations when the blades move alternately through the water and through the air. In particular, the reentry into the water after the movement through the air results in powerful shock loads upon the blades and their fastenings in the hub. For these reasons, previously known bearings and resetting mechanisms for propellers with resettable blades, which comprise various types of link motions and cam/cam follower mechanisms, have not been employed to make it possible to provide a surface-cutting propeller having blades with variable pitch. The working life would, quite simply, be unacceptably short.
The object of the present invention is in general to provide a propeller hub of the type stated in the introduction, which is specially tailored to propellers for fast boats having engines with high power and high maximum torque, for example turbo diesels, and which eliminates the need to use a high-pressure turbocharger or a mechanical compressor serially connected to the turbocompressor, as is nowadays required in turbocharged engines connected to fixed-blade propellers to raise sufficient charge pressure and torque at low revs to be able to accelerate the boat to planing speed.
In particular, the object is to provide a propeller hub of this type, having a blade resetting mechanism which, over a long operating period, withstands the loads to which it is subjected during use, together with surface-cutting propeller blades and high-power and high-torque engines.
A further object is here to provide a propeller hub for adjustable surface- cutting propeller blades, which is specially configured to be able to bear and regulate a large number of adjustable propeller blades, for example as many as ten blades or more on larger vessels.
This is achieved according to the invention by the fact that the hub housing, in its peripheral limit surface, has circular openings, in which the propeller blade carriers are rotatably mounted in bearing races in the openings and to which the radially inner portion of the propeller blades can be connected, and that the propeller blade carriers are rotatable by means of an elongated blade resetting element, which is axially displaceable in a hollow shaft connected to the hub housing and by means of which the said propeller blade carriers can be rotated relative to the hub housing via a lever and link system connected to the blade resetting element and to the propeller blade carriers.
With the resetting mechanism, the blades, when the boat is started from stationary, can be set at a small pitch, so that the engine speed rapidly reaches a speed at which even a low-pressure turbocharger produces sufficient charge pressure to yield an engine torque which is enough, when the pitch is subsequently successively increased, to accelerate the boat to planing speed.
In known link mechanisms and cam and cam follower mechanisms, an albeit very small play is in practice inevitable, which in the short term, due to the intermittent high loads, is at risk of being enlarged to the point that the mechanisms fail. By, according to the invention, instead using a lever and link system, an, in practice, play-free resetting mechanism can be produced, which can stand being connected to engines with high power and high maximum torque.
In a preferred embodiment of the invention, the hub housing supports at least two pairs of propeller blades which are diametrically opposed in pairs. An annular element can mutually connect all the propeller blade carriers in such a way that the rotary motion of the propeller blade carriers connected to the said blade resetting element is converted into rotary motion of the other propeller blade carriers via the annular element. The annular element may connect the propeller blade carriers via articulated connecting members. By, via the annular element, converting the rotary motion of one blade carrier pair into rotary motion of one or more further blade carrier pairs, it has proved possible in practice to produce a reliable propeller design of a surface-cutting propeller having up to five pairs of surface-cutting propeller blades with variable pitch.
The invention is described in greater detail below with reference to illustrative embodiments shown in the appended drawings, in which:
Fig.1 shows a diagrammatic, partially cut-open perspective view of an embodiment of a propeller hub according to the invention, having two propeller blades and mounted on a drive shaft,
Fig. 2 shows a perspective view of the link and lever mechanism of the hub in Fig. 1, in an embodiment for five pairs of propeller blades, and
Fig. 3 shows a perspective detailed view of a part of the link mechanism in Fig. 1 and 2.
The propeller hub according to the invention comprises a hub housing 1 consisting of a cylindrical drum 2, a front conical cap 3 and a rear (not shown) cap intended to be screwed to the rear edge face 4 of the drum. The hub housing 1 is non-rotatably fixed via the conical cap 3 to a drive shaft in the form of a hollow shaft 5. Inside the hollow shaft 5, a tubular slide 6 is mounted in an axially displaceable manner.
In the shown preferred illustrative embodiment, the drum 2 of the hub housing is in this case configured with ten peripherally evenly distributed circular openings 7, the edge faces 8 of which form bearing surfaces for cylindrical propeller blade carriers 9 rotatably mounted in the openings 7. In Fig. 1, for the sake of simplification, only two propeller blade carriers 9 for a pair of diametrically opposed propeller blades 10 are shown.
A shaft 11 (half-shown in Fig. 1) extends diametrically through the drum 2 and is connected at its ends to the inner side of the drum. On the shaft 11 , two sleeves 12 (one shown in Fig. 1) are rotatably mounted. A lever 13 is rigidly connected to each sleeve 12. As can be seen from Fig. 2, the levers are oppositely directed to one another. The sleeves 12 are, in turn, non-rotatably connected to one each of the two diametrically opposed propeller blade carriers 9. The shaft 11 is thus rotatably connected to the inner side of the drum through the sleeves 12 and the propeller blade carriers 9.
The slide 6, being fixed with a guide groove 6b, is connected to the lever via two link arms 14, (one shown in Fig. 1), which, in turn, are each articulately connected to a respective lever 13. Upon displacement of the slide 6 in the hollow shaft 5, the opposing propeller blade carriers 9 will be rotated in their openings 7 in the drum via the link arms 14 and the levers 13. Since the levers 13 are oppositely directed, the two diametrically opposed propeller blade carriers 9 with associated propellers 10 will be rotated in opposite directions.
In Fig. 2 a complete hub housing is shown, having a lever and link mechanism for five pairs of propellers. Fig. 3 shows a perspective detailed view of a part of the link mechanism. To each propeller blade carrier 9 is screwed one end of a link arrangement 15, the other end of which is articulately connected via a bushing 16 to an annular element 17. The link arrangement 15 consists of two legs 18 and 19, connected to one another in a V-shape, of which the leg 19 is screwed to the leg 18 and consists of two parts 19a and 19b, which are connected to one another by means of a threaded joint with locking nut 19c and thereby allow length adjustment and exact adaptation of the length of the leg 19 to the length of the leg 18. The leg 18 is adjusted with the elements 19e, 19f. The annular element 17 is provided on its outer side with guide lugs 20, which run up against an annular, concentrically surrounding guide rail 21 for guiding the annular element 17 during its rotation. When the propeller blade carriers 9 connected to the sleeves 12 are rotated in the above-described manner, the two link arrangements 15 connected to the said propeller blade carriers will transmit the rotary motion to the annular element 17, which, in turn, transmits this rotary motion to the other four pairs of link arrangements 15 and associated propeller blade carriers 9, so that all the propeller blades are synchronously set at the same pitch.
In the preferred embodiment of the propeller hub according to the invention which is described above and is shown in the figures, a second set of link arrangements 22, which are identical to but oppositely directed to the link arrangements 15, connect the propeller blade carriers to a second annular element 23 (Fig. 1). In this way, a pair of torques is obtained, which torques act upon the propeller blade carriers and eliminate uneven loading of the propeller blade carriers.

Claims

Claims
1. Boat propeller hub for a boat propeller having surface-cutting propeller blades, comprising a central hub housing (1), which supports at least two essentially diametrically opposed propeller blade carriers (9), characterized in that
the hub housing, in its peripheral limit surface, has circular openings (7), in which the propeller blade carriers (9) are rotatably mounted in bearing races (8) in the openings (7) and to which propeller blade carriers (9) a radially inner portion of the propeller blades (10) can be connected, and in that
the propeller blade carriers (9) are rotatable by means of an elongated blade resetting element (6), which is axially displaceable in a hollow shaft
(5) connected to the hub housing and by means of which the said propeller blade carriers (9) can be rotated relative to the hub housing (1), wherein
the propeller blade carriers (9) can be rotated relative to the hub housing (1) via a lever and link system (13, 14, 15) connected to the blade resetting element (6) and to the propeller blade carriers (9).
2. Boat propeller hub according to claim 1, characterized in that an annular element (17) is provided to mutually connect all the propeller blade carriers (9) such that the rotary motion of the propeller blade carriers (9) connected to the said blade resetting element (6) is converted into rotary motion of the other propeller blade carriers (9) via the annular element (17).
3. Boat propeller hub according to claim 1, characterized in that the lever and link system (13, 14, 15) comprises a radially directed shaft (11) which is fixed in the hub housing (1) and on which at least one sleeve (12) is rotatably mounted, the said sleeve(s) (12) being connected to a lever (13) and to a propeller blade carrier (9), in that the lever (13) is connected via link arm members (14) to the said blade resetting element (6), and in that a motion-transmitting element (17) converts rotary motion of the said propeller blade carriers (9) connected to the sleeve element (12) into rotary motion of the second propeller blade carrier (9).
4. Boat propeller hub according to claim 3, characterized in that the lever and link system (13, 14, 15) comprises two sleeve elements (12) rotatably mounted on the said radially directed shaft, which sleeve elements (12) are each connected to a respective propeller blade carrier (9) and to a respective lever (13) with associated link arm members (14), and in that the said lever arms (13) are oppositely directed to one another, so that displacement of the lever ends in the same direction by means of the elongated blade resetting element (6) results in rotation of the essentially diametrically opposed propeller blade carriers (9) in opposite directions.
5. Boat propeller hub according to claim 4, characterized in that the hub housing (1) supports at least two pairs of propeller blades which are diametrically opposed in pairs, and in that the said motion-transmitting element is an annular element (17), which mutually connects all the propeller blade carriers (9) in such a way that the rotary motion of the propeller blade carriers (9) connected to the said sleeve elements (12) is converted via the annular element (17) into rotary motion of the blade carriers (9) of the second propeller blade pair.
6. Boat propeller hub according to claim 5, characterized in that link members (15) articulately connected to the annular element (17) are arranged to transmit rotary motion from the blade carriers (9) of the first blade pair to the annular element (17) and from the annular element to the blade carriers (9) of the second blade pair.
7. Boat propeller hub according to claim 6, characterized in that a link member (15) is disposed between each propeller blade carrier (9) and the annular element (17) and consists of two rods (18, 19) connected to one another other in a V-shape, of which at least one rod has an adjustable length.
8. Boat propeller hub according to claim 7, characterized in that a second set of link members (22), which are oppositely directed to the first-named link members (15), connects the propeller blade carriers (9) to a second annular element (23).
9. Boat propeller hub according to any one of claims 1-8, characterized in that the hub housing (1) supports more than two pairs of diametrically opposed propeller blade carriers (9).
EP08767242A 2007-06-26 2008-06-25 Boat propeller having adjustable surface cutting propeller blades Withdrawn EP2217486A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701543A SE532866C2 (en) 2007-06-26 2007-06-26 Boat propeller hub for a boat propeller with surface cutting propeller blade
PCT/SE2008/050776 WO2009002265A1 (en) 2007-06-26 2008-06-25 Boat propeller having adjustable surface cutting propeller blades

Publications (2)

Publication Number Publication Date
EP2217486A1 true EP2217486A1 (en) 2010-08-18
EP2217486A4 EP2217486A4 (en) 2011-03-23

Family

ID=40185887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08767242A Withdrawn EP2217486A4 (en) 2007-06-26 2008-06-25 Boat propeller having adjustable surface cutting propeller blades

Country Status (3)

Country Link
EP (1) EP2217486A4 (en)
SE (1) SE532866C2 (en)
WO (1) WO2009002265A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1869280A (en) * 1931-06-16 1932-07-26 Joseph A Roemisch Controllable pitch propeller
US2527112A (en) * 1948-02-24 1950-10-24 Beuford N Willis Controllable pitch propeller
DE844721C (en) * 1949-11-29 1952-07-24 Eugen Reintjes Device for adjusting the wings of a ship's propeller
US3148735A (en) * 1964-05-12 1964-09-15 Donald L Miller Variable pitch propeller for small boats
EP1775213A2 (en) * 2005-10-12 2007-04-18 Hamilton Sundstrand Corporation Propeller pitch change system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2473463A1 (en) * 1979-10-25 1981-07-17 Milloux Maurice Variable pitch propeller for ship - runs in cowl with four blades rotating on radial pins actuated by lever
US5102301A (en) * 1988-03-28 1992-04-07 Morrison Douglas M Variable pitch propeller blades, hub and drive and adjusting mechanism therefor
GB9802570D0 (en) * 1998-02-07 1998-04-01 Duncan Ian J Propulsion system
AU3068100A (en) * 1999-12-28 2001-07-09 Nenad Fles Partially submerged controllable pitch propeller fitted to transom contoured thereto
EP1900636A1 (en) * 2006-09-15 2008-03-19 Yellowfin Limited Marine propulsion and constructional details thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1869280A (en) * 1931-06-16 1932-07-26 Joseph A Roemisch Controllable pitch propeller
US2527112A (en) * 1948-02-24 1950-10-24 Beuford N Willis Controllable pitch propeller
DE844721C (en) * 1949-11-29 1952-07-24 Eugen Reintjes Device for adjusting the wings of a ship's propeller
US3148735A (en) * 1964-05-12 1964-09-15 Donald L Miller Variable pitch propeller for small boats
EP1775213A2 (en) * 2005-10-12 2007-04-18 Hamilton Sundstrand Corporation Propeller pitch change system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009002265A1 *

Also Published As

Publication number Publication date
WO2009002265A1 (en) 2008-12-31
EP2217486A4 (en) 2011-03-23
SE532866C2 (en) 2010-04-27
SE0701543L (en) 2008-12-27

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