US3809492A - Reaction jet housing for marine propulsion system - Google Patents

Reaction jet housing for marine propulsion system Download PDF

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Publication number
US3809492A
US3809492A US00285375A US28537572A US3809492A US 3809492 A US3809492 A US 3809492A US 00285375 A US00285375 A US 00285375A US 28537572 A US28537572 A US 28537572A US 3809492 A US3809492 A US 3809492A
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United States
Prior art keywords
passageway
bars
water flow
screen
inlet
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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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US00285375A
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English (en)
Inventor
H Takaeda
A Satomoto
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.)
Aisin Corp
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Aisin Seiki Co Ltd
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Publication date
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
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Publication of US3809492A publication Critical patent/US3809492A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type

Definitions

  • ABSTRACT i A marine reaction. jet drive having a waterflow pas- Foreign Application Pri it D t sageway including inlet and outlet openings, a propul- Sept. 12 1971 Japan 46-70614 means the passageway intermediate the inlet and outlet openings, and conduit means separate from 52 U S CL u G, P 10/4 the passageway affording communication between the 415/147 outlet opening or any suitable fluid pressure source 51 1m.
  • This invention relates generally to marine propulsion systems and more particularly to marine reaction jet propulsion drives.
  • screening devices are usually provided at the inlet openings to prevent debris or the like from entering into the water passageways thereof, and during the travel of the boat, a collection of such debris and the like is apt to be produced on the screening device at the inlet openings in the bottom of the boat.
  • Such collection of debris or the like obviously operates undesirably to decrease the propulsive efficiency of the boat.
  • a principal object of the present invention therefore is to provide amarine reaction jet drive having improved means for preventing the collection of debris or the like 'at the inlet openings thereof.
  • a plurality of hollow tubular perforated bars are provided to fabricate the inlet openings in the form of a screen having the inlet openings therein, and conduit means terminating at the ends of the bars are placed in communication with any suitable fluid pressure source, or with the discharge of the reaction jet housing outlet when the drive is operating under the conditions of forward drive.
  • a valve means is further interposed in the conduit means, between the fluid pressure source or the outlet and the end of each of the bars, so as to intercept or allow the flow of water either manually or in response to a pres sure differential between the passageway and the discharge.
  • FIG. is a fragmentary view similar to FIG. 1 of another embodiment of the present invention.
  • FIGS. 6 and 7 are both sectional views taken along the line VI-VI of FIG. 8 showing details of the valve means of the embodiment of FIG. 5;
  • FIG. 8 is a sectional view taken along the line VIII- -VIII of FIG. 7;
  • FIG. 9 is a partially cut off view of the embodiment of FIG. 5, as viewed from the left side of F IG. 8, along the line lX-IX.
  • the marine propulsion system of the present invention comprises an inboard reaction jet drive I and an engine, not shown, both mounted on a boat hull 3.
  • An output shaft 4 of the engine is connected through an appropriate coupling device 5 and a gear reduction device 6 to the input shaft 7 of the jet drive 1.
  • the reaction jet drive 1 comprises, in addition to the shaft 7, a housing 8, and means in the form of bolts 9 for mounting the housing 8 to the boat hull 3, defining a waterflow passageway 10.
  • the waterflow passageway 10 has inlet openings 11 formed by a plurality of hollow tubular bars 20 arranged in parallel at the entrance of the passageway in the bottom of the boat hull 3, as shown in FIG. 2, and an outlet opening 12 at a transom 13 of the boat hull 3.
  • Water is displaced through the waterflow passageway 10 by'a propellor drive 14 disposed therein and fixed to the shaft 7.
  • a duct I5 is mounted by means of bolts 16 on the outlet portion of the housing 8.
  • the duct 15 is concentrically aligned with the waterflow passageway 10 to complete the passageway, and the desired direction of the discharged waterflow is ensured by the duct.
  • radialarms 18 Carried by radialarms 18 is a bearing 17 at the central position of the duct 15-for rotatably supporting an outer end of the driving shaft 7, such arms 18 providing therebetween radialslots through which water. can freely flow.
  • One of the significant characteristics of the present invention is the plurality of hollow tubular bars 20 provided for preventing debris and the like from entering the passageway 10, in which the inlet openings 11 are fabricated in the form of a screen S having a series of spaced parallel slots or openings 11, as shown in the plan view of FIG. 2. Debris and the like are of course prevented from entering the passageway '10 by this screen S. Further, each of the bars 20 is provided with perforations 30 in its underside wall so that a scavenging or cleaning jet can be obtained through the perforations as hereinbelow will be described in detail.
  • means are provided for scavenging or cleaning any such debris by flowing or discharging to the openings 11 a part of the discharge from the outlet opening 12 while the propellor drive 14 is in its forwardly propelling position.
  • This part of the discharge is received in a conduit 19 and directed to conduits 31 past the valve means 22 and in turn to each bar 20.
  • the conduit 19 includes a bended end 21 disposed in the internal surface of the duct 15 in communication with the internal space of the duct 15.
  • valve means When the fluid pres sure within the space is larger than that of the internal space of each of the hollow bars 20, a part of the water flow travels through the conduit 19 and is directed to each bar 20, through the valve 22, and in turn through 3 each conduit 31.
  • the valve means is normally closed but opens under a condition in which a pressure differential is produced between the outside and inside of the passageway 10, as hereinb'elow will be described in detail. 9
  • a piston 23 is slidable within a bore 24 formed in the wall of the housing 8 and is normally spring biased by a spring 26 toward abutment against an adjustable screw 25.
  • a space 28 defined by the pistonand the bore communicates with the passageway by way of a conduit 27.
  • a screw 29 is shown in FIG. 1 at the end of bended conduit portion .21, being provided for the sake'of mere design or working convenience to close the conduit thereof.
  • FIGS. 5 to 9 there is shown another embodiment of the present inven'tion,'which embodiment is almost identical in construction to the first embodiment shown in FIGS. 1 to 4 except that the valve means 22' is so constructed as to be manually operated.
  • a hollow tubular valve 40 rotatably fits in an aperture 24 in the bottom wall of the housing 8 as shown in FIG. 6.
  • the valve 40 protrudes outwardly to the left in FIG. 8 beyond the left outside face of the housing 8, being provided within its wall with a plurality of aligned holes 41 corresponding in number to the conduits 31.
  • the space 42 within the valve 40 is communicated to or intercepted from the conduits 31 and in turn the tubular bars 20 by manually rotating the valve 40.
  • the valve 40 is connected at its left end, as seen in FIG. 8, in watertight relation with a nipple 43, which is in turn connected to a flexible pipe 44 communicating with a fluid pressure source P.
  • the nipple 43 has at its right end a flange in slidable contact with the face of the housing 8, which is further slidably supported by a generally ring-shaped supporter 46 mounted on the housing 8 by means of bolts 47, as shown in section in FIG 8.
  • a seal ring 49 serves to hold the space 42 watertight relative to the outside of the valve 40.
  • the nipple 43 carries an arm 48 fast thereon, as best shown in FIG. 9.
  • a link 50 is connected at its end to the arm 48 so that the arm 48 may be swung about the axis of the valve 40 by pulling the link 50 to the right, in the view of FIG. 9, for opening the valve.
  • the oper'ator Whenever the oper'ator becomes aware of the collection of debris from a decrease of speed of travel of the boat, he may pull the link 50 so that the valve 40 is opened to allow flow of water from a pressure fluid source P to each bar past the valve 40 and conduits 31. Water injections are thus obtained through each perforation 30 to scavenge the collection of the debris on the screen S.
  • the link 50 may be connected to any suitable operating means, such as a lever or handle, not shown, which will be within convenient reach of the operator.
  • Such operating means will be provided with an end stopper anda restoring spring, as may readily be designed by those skilled in the art, so that the valve is normally spring-biased toward closure of the valve 40 until the handle or the lever abuts the stopper. Since the above implement for pulling the link 50 and its operation is well understood, no illustration is necessary to those skilled in the art.
  • the pipe 44 may beconnected to the pressure fluid source as previously described and as shown in FIG. 5
  • the pipe 44 also may be connected to the discharge at the outlet opening 12 of the drive 1 so that the scavenging jet is obtained in the same way as that of the first embodiment.
  • a reaction jet housing comprising:
  • a propulsion means in said passageway intermediate said inlet opening and said outlet opening;
  • screen means in said inlet opening being formed of a.
  • inlet openings are fabricated in the form of a screen having a series of spaced parallel openings
  • conduit means for supplying pressurized water flow to each of said bars
  • valve means for controlling said pressurized water flow to said bars including an aperture formed in a wall of said housing and a piston slidable in said aperture being normally spring biased toward a closed position, while opposed faces thereof are exposed to fluid pressures within said passageway and said conduit means respectively,
  • each of said bars being interconnected by said conduit means through said valve means to control the water flow therethrough.
  • reaction jet housing as set forth in claim 1, wherein said bars are arranged to fabricate the inlet openings in the form of a screen having a series of spaced and parallel slot-shaped inlet openings of a size to safely prevent debris from entering said passageway.
  • a reaction jet housing comprising: means defining a water flow passageway including at least one inlet opening and an outlet opening;
  • water propulsion means disposed in said passageway between said at least one inlet opening and said outlet opening;
  • a reaction jet housing comprising:
  • a propulsion means in said passageway intermediate said inlet opening and said outlet opening;
  • screen means in'said inlet opening being formed of a plurality of hollow tubular perforated bars
  • inlet openings are fabricated in the form of a screen having a series of spaced parallel openings
  • conduit means for supplying pressurized water flow to each of said bars
  • valve means for controlling said pressurized water flow to said bars including a perforated hollow tubular member, an aperture in a wall of said housing in which said tubular member rotatably fits, conduit means to conduct pressurized water flow into said tubular member, and a plurality of conduit means corresponding in number to said perforations of said hollow tubular member as well as to said bars to connect said tubular member with said bars.
  • reaction jet housing as set forth in claim 4, wherein said bars are arranged to fabricate said inlet opening in the form of a screen having a series of spaced and parallel slot-shaped inlet openings of a size to safely prevent debris from entering the passageway.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Multiple-Way Valves (AREA)
  • Nozzles (AREA)
US00285375A 1971-09-12 1972-08-31 Reaction jet housing for marine propulsion system Expired - Lifetime US3809492A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7061471A JPS5418038B2 (enrdf_load_stackoverflow) 1971-09-12 1971-09-12

Publications (1)

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US3809492A true US3809492A (en) 1974-05-07

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US00285375A Expired - Lifetime US3809492A (en) 1971-09-12 1972-08-31 Reaction jet housing for marine propulsion system

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US (1) US3809492A (enrdf_load_stackoverflow)
JP (1) JPS5418038B2 (enrdf_load_stackoverflow)
GB (1) GB1400206A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735045A (en) * 1983-03-04 1988-04-05 Innerspace Corporation Limited discharge bidirectional thruster and method of operation
US5324216A (en) * 1991-05-24 1994-06-28 Sanshin Kogyo Kabushiki Kaisha Jet pump system for a water jet propelled boat
US5501572A (en) * 1993-05-03 1996-03-26 Ksb Aktiengesellschaft Inlet housing for centrifugal pumps
US5507673A (en) * 1995-05-30 1996-04-16 Boggia; Richard Jet propelled watercraft
US5690520A (en) * 1995-10-12 1997-11-25 Bombardier Inc. Weed removal apparatus for a jet pump propelled watercraft
US20090031937A1 (en) * 2007-07-31 2009-02-05 Wylie Davin Nagler Intake
US20120178318A1 (en) * 2009-09-30 2012-07-12 Consortium De Recherche Brp-Universite De Sherbrooke S.E.N.C. Inlet Grate Cleaning System for a Water Jet Propulsion System

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1469480A (en) * 1974-08-07 1977-04-06 Ciba Geigy Ag Photographic emulsion
DE3782351T2 (de) 1986-03-25 1993-05-27 Konishiroku Photo Ind Lichtempfindliches photographisches silberhalogenidmaterial, das fuer schnelle entwicklung verwendbar ist.
JPH0815827A (ja) 1994-06-28 1996-01-19 Konica Corp ハロゲン化銀写真感光材料と放射線増感スクリーンとの組体
WO2008038764A1 (fr) 2006-09-28 2008-04-03 Fujifilm Corporation Écran à émission spontanée, procédé de fabrication d'un écran à émission spontanée, film conducteur transparent, dispositif électroluminescent, électrode transparente de cellule solaire et électrode transparente de papier électronique
JP5588597B2 (ja) 2007-03-23 2014-09-10 富士フイルム株式会社 導電性材料の製造方法及び製造装置
EP2009977A3 (en) 2007-05-09 2011-04-27 FUJIFILM Corporation Electromagnetic shielding film and optical filter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834534A (en) * 1951-09-27 1958-05-13 Snecma Centrifugal air compressor control device
GB850261A (en) * 1958-05-27 1960-10-05 Tatra Np Device for cleaning coolant air in air-cooled engines
US3306046A (en) * 1965-03-19 1967-02-28 Ontboard Marine Corp Reaction jet marine engine
US3367116A (en) * 1965-12-13 1968-02-06 Richard C. Stallman Intake grill for water jet pump
US3527430A (en) * 1967-10-25 1970-09-08 Hawker Siddeley Aviation Ltd Protective air curtains for aircraft engine inlets
US3588266A (en) * 1967-08-11 1971-06-28 Rolls Royce Low specific speed rotary pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834534A (en) * 1951-09-27 1958-05-13 Snecma Centrifugal air compressor control device
GB850261A (en) * 1958-05-27 1960-10-05 Tatra Np Device for cleaning coolant air in air-cooled engines
US3306046A (en) * 1965-03-19 1967-02-28 Ontboard Marine Corp Reaction jet marine engine
US3367116A (en) * 1965-12-13 1968-02-06 Richard C. Stallman Intake grill for water jet pump
US3588266A (en) * 1967-08-11 1971-06-28 Rolls Royce Low specific speed rotary pump
US3527430A (en) * 1967-10-25 1970-09-08 Hawker Siddeley Aviation Ltd Protective air curtains for aircraft engine inlets

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735045A (en) * 1983-03-04 1988-04-05 Innerspace Corporation Limited discharge bidirectional thruster and method of operation
US5324216A (en) * 1991-05-24 1994-06-28 Sanshin Kogyo Kabushiki Kaisha Jet pump system for a water jet propelled boat
US5401198A (en) * 1991-05-24 1995-03-28 Sanshin Kogyo Kabushiki Kaisha Jet pump system for a water jet propelled boat
US5501572A (en) * 1993-05-03 1996-03-26 Ksb Aktiengesellschaft Inlet housing for centrifugal pumps
US5507673A (en) * 1995-05-30 1996-04-16 Boggia; Richard Jet propelled watercraft
US5690520A (en) * 1995-10-12 1997-11-25 Bombardier Inc. Weed removal apparatus for a jet pump propelled watercraft
US20090031937A1 (en) * 2007-07-31 2009-02-05 Wylie Davin Nagler Intake
US20120178318A1 (en) * 2009-09-30 2012-07-12 Consortium De Recherche Brp-Universite De Sherbrooke S.E.N.C. Inlet Grate Cleaning System for a Water Jet Propulsion System

Also Published As

Publication number Publication date
JPS5418038B2 (enrdf_load_stackoverflow) 1979-07-04
JPS4836890A (enrdf_load_stackoverflow) 1973-05-31
GB1400206A (en) 1975-07-16

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