US3711220A - Marine propeller with removable blades - Google Patents

Marine propeller with removable blades Download PDF

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Publication number
US3711220A
US3711220A US00116837A US3711220DA US3711220A US 3711220 A US3711220 A US 3711220A US 00116837 A US00116837 A US 00116837A US 3711220D A US3711220D A US 3711220DA US 3711220 A US3711220 A US 3711220A
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US
United States
Prior art keywords
blade
hub
piston
cylinder
propeller
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.)
Expired - Lifetime
Application number
US00116837A
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English (en)
Inventor
C Ramback
N Ericsson
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.)
KARLSTAD MEKANISKA AB
KARLSTADS MEKANISKA WERKSTAD SW AB
Original Assignee
KARLSTAD MEKANISKA 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 KARLSTAD MEKANISKA AB filed Critical KARLSTAD MEKANISKA AB
Application granted granted Critical
Publication of US3711220A publication Critical patent/US3711220A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/12—Propeller-blade pitch changing the pitch being adjustable only when propeller is stationary
    • 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
    • B63H1/02—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
    • B63H1/26—Blades

Definitions

  • This invention relates to marine propellers of the type having removable blades and, in particular, to a system for assisting in removing the blades.
  • Some marine propellers have blades that are individually mounted on a propeller hub and may be removed from the hub for repair or replacement.
  • Variable pitch marine propellers for example, have removable blades.
  • propellers having removable blades it is advantageous that the propeller assembly, as installed on a ship, be constructed such that the individual blades can be removed and replaced without removing the entire propeller assembly from the propeller shaft.
  • each blade of a propeller having removable blades has a flange at the root end that is received within a recess on the propeller hub.
  • the blade flange and the recess are provided with matching guide edges and one or more locating pins that assist in guiding the blade into the recess and retaining it in proper position.
  • the hub of most variable pitch propellers is filled with oil, and sealing rings are generally used between the blade flanges and the blade recesses on the hub to isolate the oil chamber.
  • Removable propeller blades are normally secured to the hub by bolts that extend through holes in the blade flanges and are received in threaded holes in the hub.
  • the holes in the blade flanges are elongated slots and allow each blade to be rotated about an axis generally radially of the axis of rotation of the propeller to enable the blade pitch to be altered to suit the requirements of the particular propeller installation by merely loosening the bolts, rotating the blade in its recess mounting to the desired pitch and retightening the bolts.
  • This type of propeller there is frequently considerable difficulty in changing the pitch of the blades without damaging the seals and the guide edges between the blade flange and the recess at the propeller position on the hub. Such damage can occur, particularly with relatively large and heavy blades, because of the frictional forces developed between contacting surfaces of the blade flanges and the recesses on the hub.
  • variable pitch propellers difficulty is also encountered when removing the blade, particularly if it is of large size and weight. Frequently the blade must be rotated on its mounting before it can be removed. Basically the operation of removing a blade from a variable pitch propeller is not very much different from that involved in removing a fixed but adjustable pitch blade.
  • the invention provides for, first, substantially eliminating the frictional forces that impede rotation of a blade on its mounting so that it may be relatively easily rotated and, second, for lifting the blade a relatively substantial distance from its mounting into a position that will facilitate its ultimate removal.
  • a fluid motor is provided in association with each blade for displacing the associated blade generally radially outward, relative to the axis of rotation of the propeller, upon communication of a fluid pressure to the motor.
  • the fluid motor may be a hydraulic piston that is received in a cylinder formed in each blade flange or in the hub at each blade site.
  • the piston of each blade is urged inwardly toward the hub by hydraulic fluid pressure developed in the head of the cylinder, and an extension portion on the piston engages the hub and generates forces in the cylinder reacting inwardly against the piston and outwardly against the blade thereby to urge the blade away from the propeller hub.
  • fluid pressure acts outwardly against a piston having an extension portion that is engagable with the associated propeller blade flange and acts inwardly against the hub.
  • the piston extension portion serves as a force transmitting element to physically, through engagement of the extension portion with either the hub or the blade, provide a reaction force operating in association with an expandable fluid chamber that also applies a force in a direction opposite to that applied through the piston extension against the head end of the cylinder.
  • the arrangement considerably facilitates removing the blade, insofar as Accordingly, provides for eliminating a substantial part of the frictional forces developed between the blade and its mounting site on the hub. Accordingly the propeller blade can be rotated with almost no risk of damage to he blade mounting site or to the blade flange.
  • the arrangement does not require any seals in the flange and the hub mounting, and, of course, the possibility of damage to such seals is therefore nonexistent.
  • the fluid motor system can also be used to facilitate remounting of a blade.
  • the motor When the blade is moved into position for remounting, the motor is operated to transfer the weight of the blade from the ancillary lifting equipment to the fluid system, and the system is then controlled to lower the blade back into position and to facilitate rotating the blade to proper orientation for final attachment.
  • propeller assemblies of the type having fixed, but adjustable pitches, the system of course provides considerable advantages in making it easy to adjust and set the pitches of the blades.
  • the drawing illustrates the root and flange portions only of one blade I, and those skilled in the art will certainly understand that the propeller assembly includes three, four or perhaps more blades spaced about the circumference of a propeller hub.
  • the fluid motor arrangement and the mounting arrangement of the blade illustrated in the drawing are representative of the arrangement employed for all blades of the propeller assembly.
  • Each blade I of the propeller has a flange 3 attached to or formed integrally with the root portion of the blade.
  • the flange 3 will be circular in plan, that is; in a plane perpendicular to the plane of the drawing sheet.
  • the flange 3 of each blade is received in a matching recess 7 formed in the propeller hub 9, the recess and flange being provided with companion guide edges 11 that interfit, and with one or more locating pins 13, which are preferably arranged to be removed from outside of the flange 3.
  • the guide edges 11 and pins 13 assist in locating and retaining the blade in position on the hub.
  • the fluid motor system includes a cylinder 15 formed in the blade flange and having a head end at the top that is communicated by a passage 17 with a fitting 19 through which fluid under pressure may be introduced into the head end of the cylinder.
  • the cylinder receives a piston 21 having an appropriate seal 23 and provided with an extension portion formed with or secured to the base of the piston and extending toward the propeller hub 9.
  • the end of the extension portion of the piston 21 is engageable with a seat 25 formed on the propeller hub, the end of the extension portion and the seat being of matching shape to maintain the axis of the piston in alignment with the cylinder upon engagement between the extension portion and the hub seat.
  • a guide bushing 27 is installed in the base of the cylinder 15 to assist in guiding the piston axially of the cylinder.
  • a spring 29 is located in the annular space between the piston extension portion and the wall of the cylinder and is compressed between the base of the piston 21 and the bushing 27 so that it urges the piston 21 in an upward direction toward the head of the cylinder, thus, normally retaining the piston retracted upwardly into the cylinder and retaining the extension portion out of engagement with the propeller hub 9.
  • a stop ring 31 received in a groove in the extension portion of the piston near the bottom end of the extension engages the bushing 27 to limit the extent of the retraction of the piston into the cylinder.
  • each blade of the propeller assembly may be relocated in its hub recess, such as may be desired in a fixed, but adjustable, pitch propeller, or for removal by first rotating the propeller to position the blade that is to be adjusted or removed at the top or 12 oclock position.
  • the bolts and locating pin 13 are loosened, or removed, and a source of hydraulic fluid under pressure is connected to the fitting l9. Fluid under pressure is then introduced into the head portion of the cylinder through the passage 17, thereby generating a force on the piston 21 against the return spring 29 downwardly so that the extension portion is engaged against the seat 25 on the hub 9.
  • the application of pressure in the head of the cylinder also generates a force in the head portion of the cylinder that acts against the head in an upward direction tending to offset the weight of the propeller and ultimately to exceed the weight of the propeller and lift the propeller off the hub.
  • the force generated may, of course, be only sufficient to remove part of the weight of the blade from the hub, thereby to reduce the frictional engagement between the blade flange and the hub and enable the blade to be rotated.
  • a marine propeller assembly having a plurality of blades, each of which is removably mounted on a hub at a blade position, the hub and blades having complementary engaging portions, the engaging portion of each blade being a flange part at its root and the hub having a blade-engaging portion at each blade position, the improvement of a device for urging each blade away from the hub for removal therefrom comprising fluid-actuated piston means associated with each blade and within the propeller assembly for displacing the associated blade generally radially outward relative to the axis of rotation of the propeller, and means for communicating actuating fluid to the piston means from a location externally of the assembly, the piston means including a cylinder in one of said complementary engaging portions at each blade position, a piston in the cylinder, and a piston extension part on the piston and movable upon fluid actuation into engagement with the other of said complementary engaging portions at each blade position.
  • An improvement according to claim 1 further comprising resilient return means for restraining each piston against the movement thereof tending to displace the corresponding blade outwardly.
  • a device for urging each blade away from the hub for removal therefrom comprising in association with each blade an inwardly open cylinder formed in the blade flange, a piston received in the cylinder in sealing and sliding engagement with the cylinder walls and having an extension portion associated with it and located to engage a portion of the propeller hub at the corresponding blade position, resilient means for urging the piston away from the hub, and a passage through the blade flange communicating with a head part of the cylinder that is on the opposite side of the piston from the hub and leading to the exterior of the blade flange thereby to enable a fluid under pressure to be introduced into said head part of the cylinder and generate a force on the piston effective to urge it toward the hub and to engage the piston extension portion with the hub and to generate a force acting at the head of the cylinder and effective to

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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)
  • Actuator (AREA)
  • Hydraulic Turbines (AREA)
  • Screw Conveyors (AREA)
US00116837A 1970-04-10 1971-02-19 Marine propeller with removable blades Expired - Lifetime US3711220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE04912/70A SE332578B (pl) 1970-04-10 1970-04-10

Publications (1)

Publication Number Publication Date
US3711220A true US3711220A (en) 1973-01-16

Family

ID=20265257

Family Applications (1)

Application Number Title Priority Date Filing Date
US00116837A Expired - Lifetime US3711220A (en) 1970-04-10 1971-02-19 Marine propeller with removable blades

Country Status (13)

Country Link
US (1) US3711220A (pl)
JP (1) JPS4941798B1 (pl)
CH (1) CH518829A (pl)
DE (1) DE2103569C3 (pl)
ES (1) ES194911Y (pl)
FI (1) FI49944C (pl)
FR (1) FR2092345A5 (pl)
GB (1) GB1337641A (pl)
NL (1) NL171038C (pl)
NO (1) NO127144B (pl)
PL (1) PL70902B1 (pl)
SE (1) SE332578B (pl)
SU (1) SU383261A3 (pl)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022543A (en) * 1975-10-21 1977-05-10 Aktiebolaget Karlstads Mekaniska Werkstad Apparatus for facilitating removal of a marine propeller blade
US4643643A (en) * 1984-05-14 1987-02-17 Blohm & Voss Ag Apparatus for adjusting and locking pitch of a variable pitch propeller on a ship
US4820127A (en) * 1988-01-29 1989-04-11 Westinghouse Electric Corp. Blade support and blade assembly
EP0593907A1 (de) * 1992-10-20 1994-04-27 SULZER HYDRO GmbH Vorrichtung zum Verändern der Winkelstellung von Flügeln eines Rotors einer Strömungsmaschine
US5445497A (en) * 1993-12-27 1995-08-29 Seemar; George H. Variable pitch propellers
US20090155086A1 (en) * 2007-12-14 2009-06-18 Eurocopter Rotorcraft blade, a rotorcraft rotor provided with said blade, and a method of fabricating said blade
CN102530216A (zh) * 2012-02-14 2012-07-04 武汉船用机械有限责任公司 一种带导管的大功率全回转舵桨及其桨叶的拆卸方法
CN114364606A (zh) * 2019-09-09 2022-04-15 瓦锡兰挪威有限公司 海洋船舶螺旋桨、螺旋桨桨叶和用于安装海洋船舶螺旋桨的方法
US12065226B1 (en) * 2023-05-05 2024-08-20 Rolls-Royce Marine North America Inc. Fixed-pitch bolted propeller

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS527197A (en) * 1975-07-07 1977-01-20 Makoto Tomioka Refuge guiding device with simultaneous action of optical and acoustic stimulation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415421A (en) * 1944-05-13 1947-02-11 Filippis Raymond De Adjustable propeller
US2981338A (en) * 1957-04-15 1961-04-25 Hindmarch Thomas Locking device for propeller blades
US3358772A (en) * 1965-11-08 1967-12-19 P & O Res & Dev Co Ship's propeller mountings
US3389920A (en) * 1966-07-25 1968-06-25 Dominion Eng Works Ltd Floating seal for adjustable blade
US3549275A (en) * 1968-11-14 1970-12-22 Waukesha Bearings Corp Ship's propeller securing and jacking means
US3557744A (en) * 1967-12-11 1971-01-26 Giacier Metal Co Ltd The Aft structures of marine vessels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415421A (en) * 1944-05-13 1947-02-11 Filippis Raymond De Adjustable propeller
US2981338A (en) * 1957-04-15 1961-04-25 Hindmarch Thomas Locking device for propeller blades
US3358772A (en) * 1965-11-08 1967-12-19 P & O Res & Dev Co Ship's propeller mountings
US3389920A (en) * 1966-07-25 1968-06-25 Dominion Eng Works Ltd Floating seal for adjustable blade
US3557744A (en) * 1967-12-11 1971-01-26 Giacier Metal Co Ltd The Aft structures of marine vessels
US3549275A (en) * 1968-11-14 1970-12-22 Waukesha Bearings Corp Ship's propeller securing and jacking means

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022543A (en) * 1975-10-21 1977-05-10 Aktiebolaget Karlstads Mekaniska Werkstad Apparatus for facilitating removal of a marine propeller blade
US4643643A (en) * 1984-05-14 1987-02-17 Blohm & Voss Ag Apparatus for adjusting and locking pitch of a variable pitch propeller on a ship
US4820127A (en) * 1988-01-29 1989-04-11 Westinghouse Electric Corp. Blade support and blade assembly
EP0593907A1 (de) * 1992-10-20 1994-04-27 SULZER HYDRO GmbH Vorrichtung zum Verändern der Winkelstellung von Flügeln eines Rotors einer Strömungsmaschine
US5445497A (en) * 1993-12-27 1995-08-29 Seemar; George H. Variable pitch propellers
US20090155086A1 (en) * 2007-12-14 2009-06-18 Eurocopter Rotorcraft blade, a rotorcraft rotor provided with said blade, and a method of fabricating said blade
US8061994B2 (en) * 2007-12-14 2011-11-22 Eurocopter Rotorcraft blade, a rotorcraft rotor provided with said blade, and a method of fabricating said blade
CN102530216A (zh) * 2012-02-14 2012-07-04 武汉船用机械有限责任公司 一种带导管的大功率全回转舵桨及其桨叶的拆卸方法
CN102530216B (zh) * 2012-02-14 2014-05-21 武汉船用机械有限责任公司 一种带导管的大功率全回转舵桨及其桨叶的拆卸方法
CN114364606A (zh) * 2019-09-09 2022-04-15 瓦锡兰挪威有限公司 海洋船舶螺旋桨、螺旋桨桨叶和用于安装海洋船舶螺旋桨的方法
US20220185438A1 (en) * 2019-09-09 2022-06-16 Wärtsilä Norway As Marine Vessel Propeller, Propeller Blade And Method For Installing The Marine Vessel Propeller
US11952091B2 (en) * 2019-09-09 2024-04-09 Wärtsilä Norway As Marine vessel propeller, propeller blade and method for installing the marine vessel propeller
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
NL171038C (nl) 1983-02-01
SU383261A3 (pl) 1973-05-25
PL70902B1 (pl) 1974-04-30
FR2092345A5 (pl) 1972-01-21
NL7018902A (pl) 1971-10-12
DE2103569B2 (de) 1979-09-13
FI49944C (fi) 1975-11-10
ES194911U (es) 1975-01-01
SE332578B (pl) 1971-02-08
FI49944B (pl) 1975-07-31
CH518829A (de) 1972-02-15
DE2103569C3 (de) 1980-05-29
NO127144B (pl) 1973-05-14
DE2103569A1 (de) 1971-11-04
GB1337641A (en) 1973-11-14
NL171038B (nl) 1982-09-01
ES194911Y (es) 1975-06-01
JPS4941798B1 (pl) 1974-11-11

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