US3244236A - Marine propellers - Google Patents

Marine propellers Download PDF

Info

Publication number
US3244236A
US3244236A US452128A US45212865A US3244236A US 3244236 A US3244236 A US 3244236A US 452128 A US452128 A US 452128A US 45212865 A US45212865 A US 45212865A US 3244236 A US3244236 A US 3244236A
Authority
US
United States
Prior art keywords
propeller
shaft
boss
heating element
marine
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
US452128A
Other languages
English (en)
Inventor
Langham John Michael
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3244236A publication Critical patent/US3244236A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/006—Shrinkage connections, e.g. assembled with the parts being at different temperature
    • 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
    • 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
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49332—Propeller making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49815—Disassembling
    • Y10T29/49822—Disassembling by applying force
    • Y10T29/49824—Disassembling by applying force to elastically deform work part or connector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/21—Utilizing thermal characteristic, e.g., expansion or contraction, etc.

Definitions

  • This invention relates to marine propellers. More particularly the invention is concerned with an improved construction of amarine propeller enabling it to be easily removed from its propeller shaft,
  • the known method has two disadvantages, firstly the fact of cutting a keyway in the shaft causes local stress raisers and leads to shaft failure, particularly in large single screw vessel. Secondly, uneven and locally intense heating of the propeller boss by external means often gives rise to cracks which, in many cases, result in the propeller having to be scrapped. Furthermore, because of the different coeflicient' of expansion of the steel shaft and bronze and alloy propeller, it is common for the propller to slide along the keyway in a longitudinal direction when the ship and vessel is operating in waters where the temperature is greater than where the propeller was fitted.
  • An object of the invention is to overcome the above mentioned disadvantages and provide an improved propeller construction which enables the propeller to be readily removed from a propeller shaft without the risk of damage to the propeller or shaft.
  • a further object of the invention is to avoid the longitudinal movement which occurs due to the differential expansion.
  • the invention consists in a marine propeller comprising, an electric heating element, encased in refractory material embedded in the propeller boss in the region of the shaft receiving bore of the propeller, so that by passing an electric current through the electric heating element the said region of the boss is caused to expand in a uniform and controlled manner.
  • the electric heating element comprises a helically wound resistance wire.
  • the electric heating element comprises resistive tracking elements placed ininternal longitudinally drilled holes,
  • FIGURE 1 is an axial section through armarine propeller boss mounted on a shaft;
  • FIGURE 2 is a similar view to FIGURE 1 of a modified form of heating element
  • FIGURE 3 is a similar view to FIGURES 1 and 2 of a second embodiment of a marine propeller according to the invention.
  • the marine propeller illustrated in FIGURE 1 comprises a boss I mounted on a shaft 2.
  • the propeller boss 1 and the end portion of the shaft 2 on which the propeller is mounted are suitably locked to provide a driving connection between the propeller and shaft, while the propeller is prevented from 3,244,236 Patented Apr. 5, 1966 any axial movement by a power operated nut 3.
  • This power operated nut 3 also serves to drive the propeller hard up onto the propeller shaft when this has the conventional taper connection.
  • a helically wound electrical resistance Wire 4 encased in a covering of refractory material. This resistance wire 4 is lead out via connections 5 in the end of the shaft 2 by means of which it can be connected to an electrical supply.
  • the nut 3 is removed and the connections 5 are joined up to an electrical supply.
  • a current is passed through the resistance wire 4 heating the propeller boss 1 and causing it to expand in a uniform and controlled manner sufiicient to release the propeller from the shaft, thus enabling the propeller to be easily withdrawn from the shaft.
  • FIGURE 2 illustrates a modification of the heating element shown in FIGURE 1 in which the resistance wire 4 is set in an annular block of refractory material 6 located in a lightening chamber 7 formed in the boss 1.
  • Other constructional features and the method of removing the propeller from the shaft are the same as that described with reference to the embodiment of FIG- URE 1.
  • FIGURE 3 A second embodiment of the invention is illustrated in FIGURE 3 in which like reference numerals have been used for similar components of the first described embodiment.
  • the helically wound resistance wire 4 is replaced by a plurality of resistive tracking elements (not shown) which are placed in longitudinal drilled holes 8 which run parallel to the shaft 2. These tracking elements are connected to suitable terminal connections to which the electric supply is connected for uniformly heating the propeller boss 1 for removing it from the shaft 2.
  • a marine propeller comprising, a propeller boss, an electric heating element and refractory material encasing the heating element which is embedded in the propeller boss in the region of a shaft receivingbore of the propeller so that by passing an electric current through the electric heating element the said region of the boss is caused to expand in a uniform and controlled manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
US452128A 1964-05-04 1965-04-30 Marine propellers Expired - Lifetime US3244236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18383/64A GB1034984A (en) 1964-05-04 1964-05-04 Improvements in or relating to marine propellers

Publications (1)

Publication Number Publication Date
US3244236A true US3244236A (en) 1966-04-05

Family

ID=10111518

Family Applications (1)

Application Number Title Priority Date Filing Date
US452128A Expired - Lifetime US3244236A (en) 1964-05-04 1965-04-30 Marine propellers

Country Status (4)

Country Link
US (1) US3244236A (da)
DK (1) DK108954C (da)
GB (1) GB1034984A (da)
NL (1) NL6505590A (da)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565493A (en) * 1982-03-31 1986-01-21 Aktiebolaget Skf Hub for fans, wheels and the like
US4836749A (en) * 1988-02-19 1989-06-06 Westinghouse Electric Corp. Pre-load device for a turbomachine rotor
US5060888A (en) * 1989-06-09 1991-10-29 Societe Nationale Industrielle Et Aerospatiale Temporary linking device, especially for an artificial satellite lengthening piece, and method to free such a link
US5558888A (en) * 1994-06-27 1996-09-24 Rosemount Aerospace Inc. Injection molding nozzle heater clamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5279027A (en) * 1990-05-04 1994-01-18 Carrier Corporation Apparatus for attaching rotors to crankshafts

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565493A (en) * 1982-03-31 1986-01-21 Aktiebolaget Skf Hub for fans, wheels and the like
US4836749A (en) * 1988-02-19 1989-06-06 Westinghouse Electric Corp. Pre-load device for a turbomachine rotor
US5060888A (en) * 1989-06-09 1991-10-29 Societe Nationale Industrielle Et Aerospatiale Temporary linking device, especially for an artificial satellite lengthening piece, and method to free such a link
US5558888A (en) * 1994-06-27 1996-09-24 Rosemount Aerospace Inc. Injection molding nozzle heater clamp

Also Published As

Publication number Publication date
DK108954C (da) 1968-02-26
GB1034984A (en) 1966-07-06
NL6505590A (da) 1965-11-05

Similar Documents

Publication Publication Date Title
US2484485A (en) Die cast terminal fittings and method of making the same
US3849630A (en) Electric heating device
US3244236A (en) Marine propellers
WO2008034682A1 (de) Anordnung zur kühlung einer flüssigkeitsgekühlten elektrischen maschine mit korrosionsschutz durch hochtemperaturverzinken
DE60035578T2 (de) Läufer für einen schnellaufenden dauermagnetmotor
DE112015006539B4 (de) Metallschmelze-warmhalteofen
CH381026A (de) Wärmeschutz eines Lagers
US3477122A (en) Method of making thermocouple probe
DE2516369C2 (de) Elektrische Maschine mit Tieftemperatur-Erregerwicklung
DE2307800A1 (de) Kollektorloser gleichstrommotor fuer hohe drehzahlen
US2337903A (en) Pump rotor manufacture
EP3146535B1 (de) Leitungsdurchführung
DE870578C (de) Befestigung der Laeuferwicklung fuer Motoren oder Generatoren
DE1235176B (de) Schiffsschraube
KR20190047394A (ko) 인덕션 히팅용 나선철근이 배근된 콘크리트 구조물
DE102008058528B4 (de) Endblock für eine Magnetronanordnung mit einem rotierenden Target
DE2537950A1 (de) Ueberhitzungsschutzvorrichtung fuer den rotor einer elektrischen maschine
PL52618B1 (da)
DE112314C (da)
DE1067113B (da)
NO139459B (no) Ionisasjonsbrannmelder.
EP0525385A1 (de) Stabilisierter, keramischer Hochtemperatur-Supraleiter sowie Verfahren zu seiner Herstellung
DE338682C (de) Elektrischer Induktionsofen und Verfahren zu seinem Betriebe
US2730352A (en) Ceramic fan construction for heat treating furnaces
DE2856172C2 (de) Anordnungen an elektrischen Primärspulen für Induktionsrinnenöfen