US3754837A - Variably ventilated propeller - Google Patents

Variably ventilated propeller Download PDF

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Publication number
US3754837A
US3754837A US00259963A US3754837DA US3754837A US 3754837 A US3754837 A US 3754837A US 00259963 A US00259963 A US 00259963A US 3754837D A US3754837D A US 3754837DA US 3754837 A US3754837 A US 3754837A
Authority
US
United States
Prior art keywords
propeller
exhaust gas
propeller shaft
lower unit
rearwardly
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
US00259963A
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English (en)
Inventor
W Shimanckas
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.)
Outboard Marine Corp
Original Assignee
Outboard Marine Corp
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 Outboard Marine Corp filed Critical Outboard Marine Corp
Application granted granted Critical
Publication of US3754837A publication Critical patent/US3754837A/en
Anticipated expiration legal-status Critical
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
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/24—Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g. exhaust gas outlets
    • B63H20/245—Exhaust gas outlets
    • 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

Definitions

  • ABSTRACT Disclosed herein is a marine propulsion device com- [22] June 1972 prising a propeller shaft supported by a lower unit and [21] Appl.'No.: 259,963 extending rearwardly through an exhaust gas opening in the lower unit, a propeller having a hub adapted for discharging exhaust gas there through and mounted on 2% F5 416/93 4 1 2 23 the rearwardly extending propeller shaft for common I d 134 rotary movement with the propeller shaft and for axial 0 416 movement relative to the propeller shaft between a l first, forwardly located position and a second position located rearwardly of the forward position with the [56] References C'ted v propeller spaced axially rearwardly of the lower unit UNlTED STATES PATENTS exhaust gas opening, together with means biasing the 3,467,051 9/1969 Shimanckas 115/34 propeller toward the rearward position.
  • the invention relates to marine propulsion lower units including arrangements for mounting a through the hub propeller on a propeller shaft in such manner as to permit propeller movement axially of the propeller shaft between spaced fore and aft positions so as to selectively afford discharge of exhaust gasses either behind the propeller when the propeller is in the forward position, or when the propeller is in a rearward position, in front of the propeller through a gap between the lower unit and the rearwardly spaced propeller.
  • the propeller upon reaching a relatively high rotational speed, the propeller will develop suffi-v cient thrust to overcome the biasing means and will move forwardly on the propeller shaft to close the gap and to thereby prevent further exhaust gas ventilation and to provide for conventional through the hub" exhaust discharge with the propeller under full load.
  • propeller mounting arrangement including means affording shifting of the propeller on a propeller shaft between axially spaced forward and aft positions relative to the propeller shaft, together with means biasing the propeller toward the aft position.
  • a marine propulsion device 11 which can be either an outboard motor or a stern drive unit.
  • the marine propulsion device 11 conventionally includes a lower unit 13 which can be vertically swingable and horizontally steerible. Included in the lower unit 13 is a portion 17 which is normally submerged in water, and which includes a rearwardly facing exhaust gas discharge opening our outlet 19. Rotatably supported by the lower unit portion 17 is a propeller shaft 21 which includes a rearward portion 23 extending through the lower unit exhaust gas discharge opening 19 and rearwardly of the lower unit 13.
  • the flange 71 includes a radially extending annular portion 77 including a series of circumferentially spaced holes, or openings or ports 79, together with a forwardly projecting cylindrical portion 81 which extends from the upper end of the annular portion 77 and which engages an annular recess 83 at the rearward end of the inner propeller hub 43 to prevent communication between the propeller exhaust gas passageway 49 and the ports 79 when the propeller 33 is in the rear ward position.
  • the recess 83 at the rearward end of the inner hub 43 is defined by an outer cylindrical surface 87 adapted to interfit with the inner surfaces of the flange cylindrical portion 81 and by an annular surface 89 extending radially outwardly from the forward end of the cylindrical surface 87.
  • the nut 93 is tightened to such an extent so that the flange 71 rotates with the propeller shaft 21, thereby avoiding relative rotary movement between the outer hub 39 and the flange 71.
  • Other means can also be employed to provide for rotation of the flange 71 in common with the propeller shaft 21.
  • Means are also provided for preventing egress of exhaust gas between the lower unit 13 and the propeller 33 when the propeller 33 is in the forward position. While other arrangements can be employed, in the illustrated construction, such means comprises provision of the outer surface of the forward end of the outer propeller hub 39 of an annular recess 119 defined by a cylindrical surface 121 and by an annular surface 123 extending radially outwardly from the rearward end of the cylindrical surface 121.
  • a diverter ring 153 as disclosed in the United States Strang Patent No. 3,356,151 can be employed at the rear of the outer propeller hub 39 as generally disclosed in the before mentioned Strang Patent No. 3,356,l5l.
  • a similar but oppositely oriented diverter ring 155 can be employed, generally as shown, adjacent to the radially extending surface 123 at the forward end of the outer propeller hub 39.
  • the propeller 33 In operation, when the driving engine is not operating, the propeller 33 will be located by the spring 61 in the rearward position.
  • discharge of exhaust gasses through the exhaust gas passageway 49 in the propeller 33 is prevented by reason of engagement of the cylindrical portion 81 of the flange 71 with the inner propeller hub 43 and by reason of engagement of the radially outwardly extending portion 91 of the flange 71 with the outer propeller hub 39.
  • discharge of exhaust gasses through the resulting gap 37 forwardly of the propeller 33 is permitted.
  • Such initial propeller ventilation occursing when the propeller 33 is in the rearward position, permits rapid increase in the speed of the propeller shaft 21.
  • a marine propulsion device in accordance with claim 3 wherein said means preventing egress of exhaust gas from said propeller outlet comprises a member fixed on said propeller shaft aft of said propeller and including an outwardly extending portion closing said outlet.
  • a marine propulsion device in accordance with claim 4 wherein said propeller includes radially spaced inner and outer hubs defining therebetween said outlet, and wherein said member further includes a forwardly extending cylindrical portion engageable with said inner hub when said propeller is in said rearward position, and a circumferentially spaced series of apertures located radially inwardly of said cylindrical portion, and wherein said outer portion is engageable with said outer hub when said propeller is in said rearward position.
  • a marine propulsion device in accordance with claim 1 wherein said propeller biasing means comprises a collar fixed on said propeller shaft against forward movement relative to said propeller shaft, and a helical spring encircling said propeller shaft and seated, at its forward end, against said collar, and seated, at its rearward end, against said propeller.
  • a marine propulsion device in accordance with claim 2 wherein said propeller biasing means comprises a collar fixed on said propeller shaft against forward movement relative to said propeller shaft, and a helical spring encircling said propeller shaft and seated, as its forward end, against said collar, and seated, at its rearward end, against said propeller.
  • said propeller biasing means comprises a collar fixed on said propeller shaft against forward movement relative to said propeller shaft, and a helical spring encircling said propeller shaft and seated, as its forward end, against said collar, and seated, at its rearward end, against said propeller.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)
US00259963A 1972-06-05 1972-06-05 Variably ventilated propeller Expired - Lifetime US3754837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25996372A 1972-06-05 1972-06-05

Publications (1)

Publication Number Publication Date
US3754837A true US3754837A (en) 1973-08-28

Family

ID=22987219

Family Applications (1)

Application Number Title Priority Date Filing Date
US00259963A Expired - Lifetime US3754837A (en) 1972-06-05 1972-06-05 Variably ventilated propeller

Country Status (3)

Country Link
US (1) US3754837A (enrdf_load_stackoverflow)
JP (1) JPS5822399B2 (enrdf_load_stackoverflow)
CA (1) CA974410A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876332A (en) * 1973-10-10 1975-04-08 Outboard Marine Corp Propeller and propeller mounting arrangement
JPS5085997U (enrdf_load_stackoverflow) * 1973-12-12 1975-07-22
US4204806A (en) * 1977-12-09 1980-05-27 Outboard Marine Corporation Folding propeller
EP0013929A1 (de) * 1979-01-22 1980-08-06 Fritz-Johann Finze Vorrichtung zur Erhöhung des Rückwärtsschubes von mit Wendegetrieben ausgerüsteten Bootsmotoren
FR2506407A1 (fr) * 1981-05-21 1982-11-26 Volvo Penta Ab Dispositif de verrouillage ne permettant qu'un deplacement axial relatif limite entre deux corps et helice de bateau le mettant en oeuvre
US4436514A (en) 1980-09-16 1984-03-13 Yamaha Hatsudoki Kabushiki Kaisha Exhaust means for marine propulsion unit
US4545771A (en) * 1982-08-23 1985-10-08 Sanshin Kogyo Kabushiki Kaisha Propeller
US4575310A (en) * 1983-03-17 1986-03-11 Sanshin Kogyo Kabushiki Kaisha Propeller shock absorber for marine propulsion device
US4778419A (en) * 1985-04-08 1988-10-18 Outboard Marine Corporation Reverse thrust propeller
US5470263A (en) * 1994-04-28 1995-11-28 Brunswick Corporation Method and apparatus for improving reverse thrust of a marine drive
US5857880A (en) * 1995-07-20 1999-01-12 Sanshin Kogyo Kabushiki Kaisha Through-the-hub-propulsion unit exhaust
US5943776A (en) * 1997-09-24 1999-08-31 Shop Vac Corporation Motor shaft assembly method
US6035515A (en) * 1998-10-16 2000-03-14 Shopvac Corporation Motor shaft assembly and method
US6224434B1 (en) 1999-09-07 2001-05-01 Bombardier Motor Corporation Of America Pump jet with axial directional flow control device for thrust modulation
US7056091B2 (en) 2003-04-09 2006-06-06 Powers Charles S Propeller hub assembly having overlap zone with optional removable exhaust ring and sized ventilation plugs
US7762772B1 (en) 2007-03-23 2010-07-27 Brunswick Corporation Marine propeller with speed sensitive venting
US11459078B1 (en) 2020-12-02 2022-10-04 Brunswick Corporation Marine drives and propeller devices having exhaust venting for enhanced reverse thrust performance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54163498U (enrdf_load_stackoverflow) * 1978-05-09 1979-11-15
JPS5516942U (enrdf_load_stackoverflow) * 1978-07-20 1980-02-02
JPS5585999U (enrdf_load_stackoverflow) * 1978-12-12 1980-06-13
US4317655A (en) * 1979-11-15 1982-03-02 Brunswick Corporation Marine drive gear housing

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US343447A (en) * 1886-06-08 Grate
US3563670A (en) * 1969-01-31 1971-02-16 Brunswick Corp Marine propeller and its mounting

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876332A (en) * 1973-10-10 1975-04-08 Outboard Marine Corp Propeller and propeller mounting arrangement
JPS5085997U (enrdf_load_stackoverflow) * 1973-12-12 1975-07-22
US4204806A (en) * 1977-12-09 1980-05-27 Outboard Marine Corporation Folding propeller
EP0013929A1 (de) * 1979-01-22 1980-08-06 Fritz-Johann Finze Vorrichtung zur Erhöhung des Rückwärtsschubes von mit Wendegetrieben ausgerüsteten Bootsmotoren
US4436514A (en) 1980-09-16 1984-03-13 Yamaha Hatsudoki Kabushiki Kaisha Exhaust means for marine propulsion unit
FR2506407A1 (fr) * 1981-05-21 1982-11-26 Volvo Penta Ab Dispositif de verrouillage ne permettant qu'un deplacement axial relatif limite entre deux corps et helice de bateau le mettant en oeuvre
US4545771A (en) * 1982-08-23 1985-10-08 Sanshin Kogyo Kabushiki Kaisha Propeller
US4575310A (en) * 1983-03-17 1986-03-11 Sanshin Kogyo Kabushiki Kaisha Propeller shock absorber for marine propulsion device
US4778419A (en) * 1985-04-08 1988-10-18 Outboard Marine Corporation Reverse thrust propeller
US5470263A (en) * 1994-04-28 1995-11-28 Brunswick Corporation Method and apparatus for improving reverse thrust of a marine drive
US5857880A (en) * 1995-07-20 1999-01-12 Sanshin Kogyo Kabushiki Kaisha Through-the-hub-propulsion unit exhaust
US5943776A (en) * 1997-09-24 1999-08-31 Shop Vac Corporation Motor shaft assembly method
US6091176A (en) * 1997-09-24 2000-07-18 Shop Vac Corporation Motor shaft assembly
US6035515A (en) * 1998-10-16 2000-03-14 Shopvac Corporation Motor shaft assembly and method
US20030188414A1 (en) * 1998-10-16 2003-10-09 Mark E. Baer Motor shaft assembly and method
US7241117B2 (en) 1998-10-16 2007-07-10 Shop Vac Corporation Motor shaft assembly and method
US6224434B1 (en) 1999-09-07 2001-05-01 Bombardier Motor Corporation Of America Pump jet with axial directional flow control device for thrust modulation
US7056091B2 (en) 2003-04-09 2006-06-06 Powers Charles S Propeller hub assembly having overlap zone with optional removable exhaust ring and sized ventilation plugs
US7762772B1 (en) 2007-03-23 2010-07-27 Brunswick Corporation Marine propeller with speed sensitive venting
US11459078B1 (en) 2020-12-02 2022-10-04 Brunswick Corporation Marine drives and propeller devices having exhaust venting for enhanced reverse thrust performance

Also Published As

Publication number Publication date
JPS4956391A (enrdf_load_stackoverflow) 1974-05-31
CA974410A (en) 1975-09-16
JPS5822399B2 (ja) 1983-05-09

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