US3791762A - Ship{40 s propeller - Google Patents

Ship{40 s propeller Download PDF

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Publication number
US3791762A
US3791762A US00147466A US3791762DA US3791762A US 3791762 A US3791762 A US 3791762A US 00147466 A US00147466 A US 00147466A US 3791762D A US3791762D A US 3791762DA US 3791762 A US3791762 A US 3791762A
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United States
Prior art keywords
propeller
hub
blade
members
ship
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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
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US00147466A
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English (en)
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Hans Brehme
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
    • B63H5/10—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller of coaxial type, e.g. of counter-rotative type
    • 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
    • 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
    • B63H2001/145—Propellers comprising blades of two or more different types, e.g. different lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
    • B63H5/10—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller of coaxial type, e.g. of counter-rotative type
    • B63H2005/103—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller of coaxial type, e.g. of counter-rotative type of co-rotative type, i.e. rotating in the same direction, e.g. twin propellers

Definitions

  • the blade members each have a radially out- 2398203 M1946 g gg (W88 ward blade area and all areas of the blade members 2:962:94] 12/1960 stein 6/201 together form a propeller shape having blades located 2,982,361 5/l96l Rosen 416/121 in a common Propeller Plane transverse 0f the axis of 3,294,365 12/1966 Wilde et a1. 416/198 the hub members. 3,526,467 9/1970 Kime 416/200 6 Claims, 6 Drawing Figures PATENIEBnmmn 3,791,762
  • the present invention relates generally to propellers, and more particularly to propellers which are especially but not exclusively suitable for use in ships drives.
  • propeller types there is a type in which the hub and the propeller blades are produced separately, the blades being provided with flanges and being later threadedly or otherwise connected to the hub.
  • the disadvantage of this particular construction is that the dimensions required for the hub, especially if the number of blades carried by the hub is in excess of four, must be extremely large with the result that the effectiveness of the propeller in operation is substantially reduced.
  • Another known propeller type is the so-called tandem propeller, in which two entirely separate propellers, each complete in itself, are mounted on one and the same shaft axially spaced from one another.
  • the propellers that is the blades of each propeller, are located in axially spaced separate planes with the result that the trailing propeller or rearward propeller is influenced by the operation of the forward or leading propeller, the designation trailing and leading referring to the spacing of the propellers on the propeller shaft.
  • a tandem propeller arrangement When such a tandem propeller arrangement is mounted on a ship, it operates in a so-called ship stream field which varies with the distance of the propellers from the ship, both in its strength and in its direction. This causes difiiculties in the initial configuration of the propellers, because the local differences in the flow of water to the two propellers frequently make a tandem propeller have a different characteristic with respect to a customary one-piece propeller.
  • tandem propellers react differently to various loads and operating conditions.
  • a differential impulse strength of the force fluctuations which are transferred from the blades into the vessel occurs in the slip stream, and this in turn frequently disadvantageously influences vibrations which are originated or transmitted to the vessel.
  • a concomitant object of the invention is to provide such an improved propeller which will have lower weight and can be more readily worked during manufacturing, especially with respect to the work which is to be carried out on the blade areas or surfaces.
  • a concomitant object of the invention is to provide such a propeller which can be more readily loaded, transported and mounted.
  • a propeller particularly a ships propeller, which comprises at least two coaxial hub members and a plurality of blade members integral with and radially projecting from respective ones of these hub members.
  • Each of the blade members has a radially outer blade area and the outer blade areas of the blade members provided on the hub members together form a propeller shape having blades located in a common propeller plane transverse to the axis of the hub members.
  • the hub members are, of course, mounted on one and the same shaft, and it is preferable that a leading and a trailing hub member be provided the number of blades of which differs at most by one.
  • the blades are preferably so mounted that circumferentially successive blades alternately are located on the leading and trailing hub member. It is advantageous that the tips of the blade members are located in a common plane transversely of the axis of rotation of the hub members and that the outer regions of the blade members are substantially identical with respect to configuration and radial pitch distribution.
  • the roots of the respective bladeswhich roots are each connected with one of the hub members may extend beyond the one hub member to the other hub member.
  • more than two hub members may be provided, and the roots may then extend from the hub member with which they are rigidly connected, to one or more of these additional hub members.
  • a further embodiment of the invention provides for the hub members to correspond with respect to the number and distribution of their blade members, with the hub members being so connected that the respectively associated blade members (one blade member of each hub member always cooperates or is associated with one blade member of every other hub member in this embodiment) together constitute the configuration of a unitary blade, whose cylinder section is composed of the cylinder sections of the associated blade members which join along a common line.
  • the unitary blade which is composed of the blade members of two or more hub members may be subdivided into blade sections in a radially outer blade area, with the blade sections being axially separated and these blade sections may be different from one another as to contour, blade tip radius and direction or angle of inclination to the flow of liquid in which the propeller rotates.
  • the associated blade members may be connected along their adjoining lines, for instance by being welded together.
  • the configuration and radial pitch distribution of the blades can be selected in accordance with prevailing requirements, and because the total propeller is composed of several partial propellers such forms and overlapping of the blade surfaces can be utilized which in conventional one-piece propellers cannot be effectively employed, because of the difficulties in making and working such propellers.
  • the common plane in which the propeller blade tips are located may be symmetrical or non-symmetrical with reference to the combined axial length of the several hub members. This is especially advantageous if the hub members all have hub bores which are produced at one and the same time in a single operating step.
  • the hub members may also be connected-after they have been produced-n'gidly but releasably, or they may simply be rigidly, but non-releasably connected. They may be releasably mounted on a common structural component such as the shaft or on a sleeve or the like which in turn is mounted on the shaft.
  • the hub members may be releasably connected by means of screws or bolts which may be especially advantageously configurated as expansion bolts. In the space between axially adjacent hub members sealing means may be arranged.
  • FIG. 1 is a diagrammatic plan view of a ships propeller according to the present invention, provided with four blades;
  • FIG. 2 is a side view of FIG. 1;
  • FIG. 3 is a further side view of FIG. 1, offset through 90 with reference to the view of FIG. 2;
  • FIG. 4 is a plan view of a further embodiment of a propeller according to the present invention.
  • FIG. 5 is a side view of the propeller illustrated in FIG. 4 and FIG. 6 is a fragmentary diagrammatic view of still a further embodiment of the invention.
  • FIGS. l-3 it will be seen that the ships propeller illustrated therein is provided with a front or leading hub la and a rear or trailing hub lb. These hubs or hub members are mounted on a common propeller shaft (no separate reference numeral) so that they are in axial abutment with one another.
  • Each of the hub members 1a and 1b is provided at two diametrally opposite locations with blade members 2a and 2b, and the generatrices of the blade members 20 provided on the hub member 1a are declined rearwardly, whereas the generatrices of the blade members 2b on the hub member lb are declined or deflected forwardly.
  • the radially outer blade areas or surface portions 3a of the blade members 2a are located in a common propeller plane extending transversely of the axis of the propeller shaft and as to configuration and radial pitch distribution they essentially conform with one another.
  • the drawing will show that the root profiles of the blade roots 5a of the blades 2a, and 5b of the blades 2b, are provided on the respectively associated hubs la and 1b to the extent necessary for obtaining the desired structural strength.
  • the remaining profile length of the blade roots 5a and 5b which is not necessary for structural strength but is desirable for hydrodynamic reasons, extends beyond the respective hub la to the area of the hub lb, or vice versa.
  • the resultant ships propeller is in effect composed of two partial propellers, but in so far as its effective blade areas 3a and 3b are concerned, its configuration and radial pitch distribution, it corresponds exactly to a conventional one-piece propeller from whose configuration it deviates only in the region of the propeller roots 5a and 5b.
  • the axial displacement of the root profiles has only a very minor influence on the total operational characteristic of the propeller and is far outweighed by the advantages to be obtained in terms of lower shipping weight, simpler manufacturing and the like.
  • each of the hub members carries four blade members 2a or 2b which are always offset with reference to one another through about the respective hub member.
  • the latter are so connected that one blade member 2a of the hub member la and one associated blade member 2b of the hub member 1b together define a single complete propeller blade whose cylinder sections are composed of the cylinder sections (abutting along the lines 7) of the two cooperating blade members 2a and 2b.
  • the lines 7 passes each blade composed of blade members 2a and 2b along a surface the edges of which intersect with the blade surface which is concealed in FIG.
  • FIG. 6 shows two hub members 1a and 1b mounted on a canner sleeve 8, which latter in turn is mounted on a propeller shaft 11.
  • Expansion bolts 10 releasably connect the hub members, and a sealing member 9 is inserted between and in sealing relationship with the hub members la and 1b.
  • the partial propellers can be connected, after they are individually manufactured, and then placed in unison upon the propeller shaft, or they can be individually placed on the propeller shaft and then be connected with one another.
  • the mounting of the propellers on the shaft can be carried out by means of a Woodruff key located in corresponding recesses of the hub bores and the shaft, but is preferably carried out without the need for such keys, particularly by shrinking the hub members onto the propeller shaft in known manner, for instance with the help of an oil pressure process.
  • the end faces of the hub members which abut may be either planar or profiled as desired.
  • propellers according to the present invention cannot only be manufactured much more simply than what is known heretofore, but can also be transported and mounted in a simpler and quicker manner than herebefore.
  • propellers according to the present invention save time and expense in case of collisions, for instance if only a part of the propeller is damaged and can then be replaced without having to discard and replace the entire propeller. It is also important that by increasing the propeller surfaces, and by providing a double-decker arrangement of the outer blade regions with the propeller according to the present invention, cavitation symptoms can be reduced which heretofore have provided a major source of difficulties in the use of propellers.

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  • 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)
US00147466A 1970-05-29 1971-05-27 Ship{40 s propeller Expired - Lifetime US3791762A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2026290A DE2026290C3 (de) 1970-05-29 1970-05-29 Propeller

Publications (1)

Publication Number Publication Date
US3791762A true US3791762A (en) 1974-02-12

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Family Applications (1)

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US00147466A Expired - Lifetime US3791762A (en) 1970-05-29 1971-05-27 Ship{40 s propeller

Country Status (7)

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US (1) US3791762A (enrdf_load_stackoverflow)
CA (1) CA948494A (enrdf_load_stackoverflow)
DE (1) DE2026290C3 (enrdf_load_stackoverflow)
FR (1) FR2093760A5 (enrdf_load_stackoverflow)
GB (1) GB1297723A (enrdf_load_stackoverflow)
NL (1) NL7107143A (enrdf_load_stackoverflow)
SE (1) SE363608B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022544A (en) * 1975-01-10 1977-05-10 Anatoly Viktorovich Garkusha Turbomachine rotor wheel
US4306839A (en) * 1979-08-23 1981-12-22 The United States Of America As Represented By The Secretary Of The Navy Semi-tandem marine propeller
US5611668A (en) * 1995-06-16 1997-03-18 Bosch Automotive Motor Systems, Inc. Multi-part injection-molded plastic fan
US6390776B1 (en) * 2000-03-30 2002-05-21 David Gruenwald Marine propeller
US20040083609A1 (en) * 2002-11-04 2004-05-06 Malott Theodore A. Two-piece molded fan
US9011100B2 (en) * 2012-09-12 2015-04-21 Mehmet Nevres ULGEN Demountable propeller
US20150139801A1 (en) * 2013-11-15 2015-05-21 Mehmet Nevres ULGEN Propeller Arrangement for Marine Vehicles

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US36492A (en) * 1862-09-16 Improved marine propcller
US51295A (en) * 1865-12-05 Improved screw-propeller
US535172A (en) * 1895-03-05 turn-ell
US865364A (en) * 1906-11-01 1907-09-10 Frederick A Douse Propeller.
US933151A (en) * 1909-04-06 1909-09-07 Theodore Amnelius Propeller.
US1363660A (en) * 1916-11-07 1920-12-28 Fleur Essaie La Propeller
DE489795C (de) * 1928-03-18 1930-01-20 Albert Rupp Einrichtung zur Befestigung mehrerer Luftschrauben auf einer Nabe mittels durchlaufender Verbindungsbolzen
US1886891A (en) * 1930-07-21 1932-11-08 Frederick J Martens Propeller
US2350942A (en) * 1940-10-17 1944-06-06 Thomas R Tarn Dual propeller
US2398203A (en) * 1943-11-20 1946-04-09 Wright Aeronautical Corp Centrifugal compressor entry vane
FR997656A (fr) * 1949-10-17 1952-01-09 Roue à pales, notamment pour ventilateur
CA527835A (en) * 1956-07-17 Helge Natamael Ulander Per Rotors for rotary gas compressors and motors
US2962941A (en) * 1955-08-03 1960-12-06 Avco Mfg Corp Apparatus for producing a centrifugal compressor rotor
US2982361A (en) * 1958-12-19 1961-05-02 United Aircraft Corp Variable camber blading
US3294365A (en) * 1964-12-02 1966-12-27 Rolls Royce Blade for use in a fluid-flow machine
US3526467A (en) * 1968-08-23 1970-09-01 Chemineer Agitator impeller

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA527835A (en) * 1956-07-17 Helge Natamael Ulander Per Rotors for rotary gas compressors and motors
US51295A (en) * 1865-12-05 Improved screw-propeller
US535172A (en) * 1895-03-05 turn-ell
US36492A (en) * 1862-09-16 Improved marine propcller
US865364A (en) * 1906-11-01 1907-09-10 Frederick A Douse Propeller.
US933151A (en) * 1909-04-06 1909-09-07 Theodore Amnelius Propeller.
US1363660A (en) * 1916-11-07 1920-12-28 Fleur Essaie La Propeller
DE489795C (de) * 1928-03-18 1930-01-20 Albert Rupp Einrichtung zur Befestigung mehrerer Luftschrauben auf einer Nabe mittels durchlaufender Verbindungsbolzen
US1886891A (en) * 1930-07-21 1932-11-08 Frederick J Martens Propeller
US2350942A (en) * 1940-10-17 1944-06-06 Thomas R Tarn Dual propeller
US2398203A (en) * 1943-11-20 1946-04-09 Wright Aeronautical Corp Centrifugal compressor entry vane
FR997656A (fr) * 1949-10-17 1952-01-09 Roue à pales, notamment pour ventilateur
US2962941A (en) * 1955-08-03 1960-12-06 Avco Mfg Corp Apparatus for producing a centrifugal compressor rotor
US2982361A (en) * 1958-12-19 1961-05-02 United Aircraft Corp Variable camber blading
US3294365A (en) * 1964-12-02 1966-12-27 Rolls Royce Blade for use in a fluid-flow machine
US3526467A (en) * 1968-08-23 1970-09-01 Chemineer Agitator impeller

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022544A (en) * 1975-01-10 1977-05-10 Anatoly Viktorovich Garkusha Turbomachine rotor wheel
US4306839A (en) * 1979-08-23 1981-12-22 The United States Of America As Represented By The Secretary Of The Navy Semi-tandem marine propeller
US5611668A (en) * 1995-06-16 1997-03-18 Bosch Automotive Motor Systems, Inc. Multi-part injection-molded plastic fan
US6390776B1 (en) * 2000-03-30 2002-05-21 David Gruenwald Marine propeller
US20040083609A1 (en) * 2002-11-04 2004-05-06 Malott Theodore A. Two-piece molded fan
US9011100B2 (en) * 2012-09-12 2015-04-21 Mehmet Nevres ULGEN Demountable propeller
US20150139801A1 (en) * 2013-11-15 2015-05-21 Mehmet Nevres ULGEN Propeller Arrangement for Marine Vehicles
US9550555B2 (en) * 2013-11-15 2017-01-24 Mehmet Nevres ULGEN Propeller arrangement for marine vehicles

Also Published As

Publication number Publication date
NL7107143A (enrdf_load_stackoverflow) 1971-12-01
GB1297723A (enrdf_load_stackoverflow) 1972-11-29
FR2093760A5 (enrdf_load_stackoverflow) 1972-01-28
DE2026290B2 (de) 1974-09-26
CA948494A (en) 1974-06-04
SE363608B (enrdf_load_stackoverflow) 1974-01-28
DE2026290C3 (de) 1975-05-28
DE2026290A1 (de) 1971-12-02

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