US3448715A - Marine propeller having a buoyant chamber - Google Patents

Marine propeller having a buoyant chamber Download PDF

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Publication number
US3448715A
US3448715A US617687A US3448715DA US3448715A US 3448715 A US3448715 A US 3448715A US 617687 A US617687 A US 617687A US 3448715D A US3448715D A US 3448715DA US 3448715 A US3448715 A US 3448715A
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United States
Prior art keywords
propeller
chamber
boss
shaft
buoyant chamber
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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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US617687A
Inventor
Colin Wray Herbert
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Federal Mogul Engineering Ltd
Original Assignee
Glacier Metal Co Ltd
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/008—Sealings comprising at least two sealings in succession with provision to put out of action at least one sealing; One sealing sealing only on standstill; Emergency or servicing sealings
    • 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
    • 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
    • B63H1/38—Propulsive elements directly acting on water characterised solely by flotation properties, e.g. drums
    • 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
    • B63H23/321—Bearings or seals specially adapted for propeller shafts
    • 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
    • B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
    • 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
    • B63H23/321—Bearings or seals specially adapted for propeller shafts
    • B63H2023/327—Sealings specially adapted for propeller shafts or stern tubes
    • 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
    • B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
    • B63H2023/342—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts comprising couplings, e.g. resilient couplings; Couplings therefor

Definitions

  • a marine propeller has a buoyant chamber attached to its aft end to reduce the bending moment on the shaft where it passes through the stern bearing.
  • the buoyant chamber is a closed shell filled with closed-cell foam to prevent access of water in the case of damage to the shell.
  • To give maximum support to the shaft the buoyant chamber is of slightly tapering external form and truncated at its aft end.
  • the present invention relates to marine propellers.
  • the mounting of a large heavy propeller on the aft end of the propeller shaft in conventional manner gives rise to substantial bending moments on the shaft and places a substantial load on the bearings supporting the shaft.
  • a marine propeller with a boss which has at its aft end a buoyancy chamber providing a lifting moment acting in opposition to the weight of the propeller.
  • the buoyancy chamber is a detachable closed hollow body in the form of a shell of reinforced plastic filled with a foam material having a closed cell structure.
  • the present invention is used in conjunction with a propeller of the kind described in a co-pending application which has a boss in the form of a hollow cylinder with an internal flange for attachment to an end flange on the propeller shaft.
  • This form of propeller boss likewise serves to reduce the bending moments on the propeller shaft since the weight of the propeller is carried forward around the shaft and the bearing supporting the shaft can extend closer to the centre of gravity of the propeller.
  • FIGS. 1A and 1B are respectively a side elevation and plan of a propeller assembly in accordance with the invention
  • FIGS. 2A and 2B are respectively a side elevation and plan of modification of the assembly of FIGS. 1A and 1B,
  • FIGS. 2C and 2D are respectively a side elevation and a plan of a further modification of the assembly of FIGS. 1A and 1B, and
  • FIG. 3 is a longitudinal section of a propeller in accordance with the invention.
  • FIGS. 1A and 1B show a propeller mounted on the aft end of a propeller shaft (not shown) extending from a stern frame 11 of a ship.
  • a rudder 12 is mounted in conventional manner aft of the propeller 10.
  • the propeller has a boss 13 which carries a buoyancy chamber 14 of generally cylindrical form extending close to the rudder 12.
  • the profile of the buoyancy chamber 14 prolongs that of the propeller boss 13 with a progressivelyice increasing taper but is truncated at the aft end where its diameter is still greater than half the diameter at the boss.
  • the buoyancy chamber 14 provides an upthrust exerting a lifting moment in opposition to the weight of the propeller 10. For this purpose it is desirable to keep the diameter of the buoyancy chamber 14 at its aft end as large as possible in order to increase the moment of the buoyancy about the shaft bearing.
  • the rudder 12 is recessed at 15 to receive the aft tend of the chamber 14, thus enabling the rudder to be kept close to the propeller while using a buoyancy chamber 14 with a substantial axial length.
  • the chamber 14 has a small angle of taper. Its profile is continued by a fairing 16 on the rudder to smooth the flow of water around the propeller and rudder. Alternative profiles are shown in broken lines.
  • the propeller assembly of FIGS. 2C and 2D corresponds to that of FIGS. 1A and 1B in having a halfbalanced rudder but has the buoyancy chamber 14 accommodated in arecess 15 bounded by a curved wall 15a.
  • the rudder is thus brought as close to the propeller as possible while obtaining significant buoyancy from the chamber 14 and good streamlining.
  • FIG. 3 shows the construction of the propeller 10 and the chamber 14.
  • the boss 13- is a hollow cylinder having an internal annular flange -17 which is secured to an end flange 18 of a propeller shaft 19.
  • the weight of the propeller can be further forward than in designs in which the boss is carried directly on the shaft or has its forward end attached to the aft end of the shaft.
  • the aft end of the boss 13 is fitted with a transverse sealing wall 20.
  • the buoyancy chamber '14 consists of a rigid shell 21 of synthetic resin reinforced with glass fibre and a body 22 of rigid foam plastic having a closed cell structure filling the shell 21.
  • Metal strengthening plates 23 are embedded in the Walll of the shell 21 and the shell is bolted to the aft end of the propeller boss 13 by bolts 14.
  • the shell 21 can be fabricated from sheet metal or from synthetic or natural elastomers, vulcanised or unvulcanised.
  • the foam body 22 can be of polyurethane or other synthetic material which produces a light foam with a closed cell structure.
  • the closed cell structure is desirable in case of damage to the shell since it prevents flooding of the whole of the interior of the buoyancy chamber.
  • the foam can be formed in situ and serves to give support to the wall of the shell.
  • Alternative methods of fixing the buoyancy chamber to the propeller can be used but are preferably always such as to enable the buoyancy chamber to be removed for access to the propeller for removal and inspection.
  • a marine propeller having a boss, a buoyant chamber attached to the aft end of said boss, said buoyant chamber being of slightly tapering external form, and truncated at its aft end, said aft end of said buoyant chamber extending substantially perpendicular to the axis of said buoyant chamber, said aft end of said buoyant chamber having a diameter greater than about half the diameter at said boss, said buoyant chamber being a closed hollow body, and a filling of closed-cell foam material within said hollow body.
  • a marine propeller as claimed in claim 1 in which the closed hollow body is a shell of reinforced plastic.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Of Bearings (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Sliding-Contact Bearings (AREA)
  • Sealing Devices (AREA)
  • Treatment Of Sludge (AREA)
  • Fats And Perfumes (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Description

u 10, 1969 I c. w. HERBERT 3,448,715
MARINE PROPELLER HAVING .A BUOYANT CHAMBER Filed Feb. 21. 1967 snet of 4 June 10, 1969 I .W. EB T 3,448,715
MARINE PROPELLER HAVING A, BUOYANT CHAMBER v Filed Feb. 21', 19 s? Sheet 3 of 4 June 10, 1969 c. w. HERBERT 3,448,715
MARINE PROPELLER HAVING -A BUOYANT CHAMBER Filed Feb. 21, 1967 Sheet 3 of 4 June 10, 1969 c, w, HERBERT 3,448,715 l MARINE PROPELLER HAVING A BUOYANT CHAMBER Filed Feb. 21, 1957 Sheet of 4 Q g I I Q 1 l 2 I I I III I I I I I I I I i 1' 1 w m l N I L H. N 3 N United States Patent 6 Int. Cl. B63h 1/38, /06
U.S. Cl. 115-34 3 Claims ABSTRACT OF THE DISCLOSURE A marine propeller has a buoyant chamber attached to its aft end to reduce the bending moment on the shaft where it passes through the stern bearing. The buoyant chamber is a closed shell filled with closed-cell foam to prevent access of water in the case of damage to the shell. To give maximum support to the shaft the buoyant chamber is of slightly tapering external form and truncated at its aft end.
The present invention relates to marine propellers. The mounting of a large heavy propeller on the aft end of the propeller shaft in conventional manner gives rise to substantial bending moments on the shaft and places a substantial load on the bearings supporting the shaft.
In accordance with the present invention there is provided a marine propeller with a boss which has at its aft end a buoyancy chamber providing a lifting moment acting in opposition to the weight of the propeller.
In a preferred embodiment the buoyancy chamber is a detachable closed hollow body in the form of a shell of reinforced plastic filled with a foam material having a closed cell structure.
Preferably the present invention is used in conjunction with a propeller of the kind described in a co-pending application which has a boss in the form of a hollow cylinder with an internal flange for attachment to an end flange on the propeller shaft. This form of propeller boss likewise serves to reduce the bending moments on the propeller shaft since the weight of the propeller is carried forward around the shaft and the bearing supporting the shaft can extend closer to the centre of gravity of the propeller.
The invention will now be described in more detail with the aid of examples illustrated in the accompanying drawings, in which:
FIGS. 1A and 1B are respectively a side elevation and plan of a propeller assembly in accordance with the invention,
FIGS. 2A and 2B are respectively a side elevation and plan of modification of the assembly of FIGS. 1A and 1B,
FIGS. 2C and 2D are respectively a side elevation and a plan of a further modification of the assembly of FIGS. 1A and 1B, and
FIG. 3 is a longitudinal section of a propeller in accordance with the invention.
FIGS. 1A and 1B show a propeller mounted on the aft end of a propeller shaft (not shown) extending from a stern frame 11 of a ship. A rudder 12 is mounted in conventional manner aft of the propeller 10. The propeller has a boss 13 which carries a buoyancy chamber 14 of generally cylindrical form extending close to the rudder 12. The profile of the buoyancy chamber 14 prolongs that of the propeller boss 13 with a progressivelyice increasing taper but is truncated at the aft end where its diameter is still greater than half the diameter at the boss. The buoyancy chamber 14 provides an upthrust exerting a lifting moment in opposition to the weight of the propeller 10. For this purpose it is desirable to keep the diameter of the buoyancy chamber 14 at its aft end as large as possible in order to increase the moment of the buoyancy about the shaft bearing.
In FIGS. 2A and 2B the rudder 12 is recessed at 15 to receive the aft tend of the chamber 14, thus enabling the rudder to be kept close to the propeller while using a buoyancy chamber 14 with a substantial axial length. The chamber 14 has a small angle of taper. Its profile is continued by a fairing 16 on the rudder to smooth the flow of water around the propeller and rudder. Alternative profiles are shown in broken lines.
The propeller assembly of FIGS. 2C and 2D corresponds to that of FIGS. 1A and 1B in having a halfbalanced rudder but has the buoyancy chamber 14 accommodated in arecess 15 bounded by a curved wall 15a. The rudder is thus brought as close to the propeller as possible while obtaining significant buoyancy from the chamber 14 and good streamlining.
FIG. 3 shows the construction of the propeller 10 and the chamber 14. The boss 13- is a hollow cylinder having an internal annular flange -17 which is secured to an end flange 18 of a propeller shaft 19. The weight of the propeller can be further forward than in designs in which the boss is carried directly on the shaft or has its forward end attached to the aft end of the shaft. The aft end of the boss 13 is fitted with a transverse sealing wall 20. The buoyancy chamber '14 consists of a rigid shell 21 of synthetic resin reinforced with glass fibre and a body 22 of rigid foam plastic having a closed cell structure filling the shell 21. Metal strengthening plates 23 are embedded in the Walll of the shell 21 and the shell is bolted to the aft end of the propeller boss 13 by bolts 14.
The shell 21 can be fabricated from sheet metal or from synthetic or natural elastomers, vulcanised or unvulcanised. The foam body 22 can be of polyurethane or other synthetic material which produces a light foam with a closed cell structure. The closed cell structure is desirable in case of damage to the shell since it prevents flooding of the whole of the interior of the buoyancy chamber. The foam can be formed in situ and serves to give support to the wall of the shell. Alternative methods of fixing the buoyancy chamber to the propeller can be used but are preferably always such as to enable the buoyancy chamber to be removed for access to the propeller for removal and inspection.
I claim:
1. A marine propeller having a boss, a buoyant chamber attached to the aft end of said boss, said buoyant chamber being of slightly tapering external form, and truncated at its aft end, said aft end of said buoyant chamber extending substantially perpendicular to the axis of said buoyant chamber, said aft end of said buoyant chamber having a diameter greater than about half the diameter at said boss, said buoyant chamber being a closed hollow body, and a filling of closed-cell foam material within said hollow body.
2. A marine propeller as claimed in claim 1 in which the closed hollow body is a shell of reinforced plastic.
3. A marine propeller as claimed in claim 1 wherein the boss is in the form of a hollow cylinder having an internal flange for attachment to an end flange on the propeller shaft.
(References on following page) 3 4 References Cited 2,987,123 6/1961 Liaaen 170-16023 UNITED STATES PATENTS 3,132,417 5/1964 II'Will 9-8 X 794,932 7/1905 Fullerton. FOREIGN PATENTS 1,834,003 12/1931 Oertz 114-162 1,022,792 8/1950 Fra 2,028,448 1/1936 Harza 170-16023 X 5 51,361 8/1932 Norway, 2,283,291 5/1942 Selden 114-162 X 2,470,517 5/ 1949 Obrist 170-16024 TRYGVE M. BLIX, Primary Examiner.
2,933,141 4/1960 Kapsenberg 170-160.23
US617687A 1966-02-22 1967-02-21 Marine propeller having a buoyant chamber Expired - Lifetime US3448715A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7827/66A GB1182611A (en) 1966-02-22 1966-02-22 Improved Stern Gear for Ships
GB5509366 1966-12-08

Publications (1)

Publication Number Publication Date
US3448715A true US3448715A (en) 1969-06-10

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US617687A Expired - Lifetime US3448715A (en) 1966-02-22 1967-02-21 Marine propeller having a buoyant chamber
US617689A Expired - Lifetime US3467050A (en) 1966-02-22 1967-02-21 Stern gear for ships
US617540A Expired - Lifetime US3405765A (en) 1966-02-22 1967-02-21 Ship's propeller mounting

Family Applications After (2)

Application Number Title Priority Date Filing Date
US617689A Expired - Lifetime US3467050A (en) 1966-02-22 1967-02-21 Stern gear for ships
US617540A Expired - Lifetime US3405765A (en) 1966-02-22 1967-02-21 Ship's propeller mounting

Country Status (10)

Country Link
US (3) US3448715A (en)
BE (1) BE772234Q (en)
DE (1) DE1295411B (en)
DK (2) DK118995B (en)
FR (1) FR1512180A (en)
GB (2) GB1182611A (en)
NL (3) NL6702659A (en)
NO (2) NO124917B (en)
SE (2) SE344571B (en)
SU (1) SU477572A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12065226B1 (en) * 2023-05-05 2024-08-20 Rolls-Royce Marine North America Inc. Fixed-pitch bolted propeller

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE300366B (en) * 1967-09-26 1968-04-22 Sixten Englesson
US3838654A (en) * 1971-12-30 1974-10-01 Bruker Physik Ag Submarine craft
US4021143A (en) * 1975-06-17 1977-05-03 Stone Manganese Marine Limited Marine propeller arrangement
US4534569A (en) * 1983-09-27 1985-08-13 Mitsubishi Jukogyo Kabushiki Kaisha Stern tube seal device providing a seal about a rotatable shaft
US4789303A (en) * 1987-12-22 1988-12-06 Brunswick Corporation Marine propeller carry handle and emergency spare kit
FR2673908A1 (en) * 1991-03-13 1992-09-18 Delmotte Didier Device for maintaining and controlling the sealing and the lubrication of the lines of transmission shafts of the engines of boats
DE102011055042A1 (en) 2011-11-04 2013-05-08 Jastram Gmbh & Co. Kg Arrangement for propeller of rudder propeller of watercraft, comprises propeller with section extending into shaft opening, in which groove formed radially outward is placed to form winding protection between shaft opening and propeller

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US794932A (en) * 1904-09-01 1905-07-18 John D Fullerton Propeller.
US1834003A (en) * 1929-03-01 1931-12-01 Oertz Anna Emilia Hollow rudder for ships
US2028448A (en) * 1935-04-03 1936-01-21 Leroy F Harza Hydraulic turbine
US2283291A (en) * 1937-10-02 1942-05-19 Goetaverken Ab Afterbody of vessels
US2470517A (en) * 1944-04-27 1949-05-17 Escher Wyss Machinenfabriken A Variable-pitch propeller
FR1022792A (en) * 1950-08-03 1953-03-10 Chantier Et Ateliers De Saint Arrangement of an ogival shaped surface on fixed or moving parts located behind a ship's propeller
US2933141A (en) * 1954-11-13 1960-04-19 Konink Mij De Schelde Nv Marine adjustable-blade propeller and sealing means therefor
US2987123A (en) * 1950-11-16 1961-06-06 Liaaen Nils Johannes Arrangement in propellers with variable pitch blades
US3132417A (en) * 1961-10-18 1964-05-12 Dayton Formold Inc Production of plastic foam articles

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE334386C (en) * 1919-08-09 1921-03-14 Hans Reissner Dr Ing Attachment for propellers and similar machine parts
DE679926C (en) * 1935-12-21 1939-08-17 Gustav Koehler Dipl Ing Attachment of radially loaded double blades
US2581834A (en) * 1946-03-22 1952-01-08 United Aircraft Corp Impeller mounting
US2514097A (en) * 1947-01-14 1950-07-04 Morgan Smith S Co Hub construction for variable pitch propellers or the like
FR997656A (en) * 1949-10-17 1952-01-09 Impeller, especially for fan
GB806386A (en) * 1956-02-17 1958-12-23 Marius Cornelis Pieterse Method for securing an oil-bath stern tube in a ship, and stern tube and adjacent parts for the application of this method
DE1768147U (en) * 1958-03-31 1958-06-04 Eisenwerke Muelheim Meiderich PROPELLER MOUNTING.
GB1001627A (en) * 1963-02-18 1965-08-18 P & O Res & Dev Co Improvements in and relating to the mounting of propellers in torque or torque andthrust transmitting connection with a tapered shaft
GB1009254A (en) * 1963-06-28 1965-11-10 Otto Fritz Hefft Thrust block

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US794932A (en) * 1904-09-01 1905-07-18 John D Fullerton Propeller.
US1834003A (en) * 1929-03-01 1931-12-01 Oertz Anna Emilia Hollow rudder for ships
US2028448A (en) * 1935-04-03 1936-01-21 Leroy F Harza Hydraulic turbine
US2283291A (en) * 1937-10-02 1942-05-19 Goetaverken Ab Afterbody of vessels
US2470517A (en) * 1944-04-27 1949-05-17 Escher Wyss Machinenfabriken A Variable-pitch propeller
FR1022792A (en) * 1950-08-03 1953-03-10 Chantier Et Ateliers De Saint Arrangement of an ogival shaped surface on fixed or moving parts located behind a ship's propeller
US2987123A (en) * 1950-11-16 1961-06-06 Liaaen Nils Johannes Arrangement in propellers with variable pitch blades
US2933141A (en) * 1954-11-13 1960-04-19 Konink Mij De Schelde Nv Marine adjustable-blade propeller and sealing means therefor
US3132417A (en) * 1961-10-18 1964-05-12 Dayton Formold Inc Production of plastic foam articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12065226B1 (en) * 2023-05-05 2024-08-20 Rolls-Royce Marine North America Inc. Fixed-pitch bolted propeller

Also Published As

Publication number Publication date
NO123415B (en) 1971-11-08
SE344571B (en) 1972-04-24
NO124917B (en) 1972-06-26
NL6702658A (en) 1967-08-23
DE1295411B (en) 1969-05-14
US3467050A (en) 1969-09-16
DK125881B (en) 1973-05-21
GB1182611A (en) 1970-02-25
SE306256B (en) 1968-11-18
DK118995B (en) 1970-10-26
US3405765A (en) 1968-10-15
GB1186858A (en) 1970-04-08
SU477572A3 (en) 1975-07-15
BE772234Q (en) 1972-01-17
FR1512180A (en) 1968-02-02
NL6702657A (en) 1967-08-23
NL6702659A (en) 1967-08-23

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