US3467051A - Exhaust system for marine propulsion device - Google Patents

Exhaust system for marine propulsion device Download PDF

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Publication number
US3467051A
US3467051A US627116A US3467051DA US3467051A US 3467051 A US3467051 A US 3467051A US 627116 A US627116 A US 627116A US 3467051D A US3467051D A US 3467051DA US 3467051 A US3467051 A US 3467051A
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United States
Prior art keywords
propeller
exhaust gas
propeller shaft
discharge port
lower unit
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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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US627116A
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English (en)
Inventor
William J 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
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Outboard Marine Corp
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Filing date
Publication date
Application filed by Outboard Marine Corp filed Critical Outboard Marine Corp
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Publication of US3467051A publication Critical patent/US3467051A/en
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    • 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
    • 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
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/14—Gearings for reversal only
    • F16H3/145—Gearings for reversal only with a pair of coaxial bevel gears, rotatable in opposite directions

Definitions

  • a marine propulsion lower unit which is arranged to afford exhaust gas discharge during forward drive through a discharge outlet at the rear of a propeller hub, and when operating under conditions other than in forward drive, to provide underwater exhaust gas discharge upstream from the exhaust gas discharge outlet at the rear of the propeller.
  • FIGURE 1 is a fragmentary view, partially in section, of a marine propulsion device embodying various of the features of the invention
  • FIGURE 2 is an enlarged fragmentary view, partially in section, of the propulsion device shown in FIGURE 1 with certain components in another position;
  • FIGURE 3 is a fragmentary view, partially in section, of another embodiment of the invention which is similar to the embodiment shown in FIGURES l and 2;
  • FIGURE 4 is a fragmentary view, partially in section, of the device shown in FIGURE 3 with certain components in another position;
  • FIGURE 5 is a fragmentary view, partially in section, of another marine propulsion device embodying various of the features of the invention.
  • FIGURE 6 is a fragmentary view, partially in section, of the device shown in FIGURE 5 with certain components in different positions;
  • FIGURE 7 is a fragmentary view, partially in section, of another marine propulsion device embodying various of the features of the invention.
  • FIGURE 8 is a fragmentary view, partially in section, of the device shown in FIGURE 7 with certain components in different positions.
  • FIGURE 1 Shown in FIGURE 1 is a fragmentarily illustrated marine propulsion device 11 including a lower unit 13 which can be vertically and horizontally swingably mounted to a boat hull.
  • the lower unit 13 includes a drive shaft housing 15 having, at the lower end thereof, a gear case 17 in which there is rotatably mounted a propeller shaft 19.
  • the lower unit also conventionally includes an exhaust gas passageway 23 which extends through the drive shaft housing 15 and terminates, at the rearward end of the gear case 17, in an exhaust gas discharge port 25 through which extends the propeller shaft 19.
  • the propeller shaft can be connected for forward drive, rearward drive, and neutral by a clutch mechanism (not shown).
  • a propeller 27 Carried on the propeller shaft 19 for rotation therewith is a propeller 27 having a hub 29 and a plurality of blades 31 mounted on the hub, each blade having a forward face 31a and a rearward face 31b.
  • the propeller 27 includes an inner sleeve portion 30 which is connected to the hub 29 by a plurality of radially extending ribs 32 and which, together with the hub 29, defines an axially extending exhaust gas duct 33 provided, at its forward end, with an inlet 34 and, at its rearward end, with a discharge opening or outlet 35 rearward of the propeller blades 31.
  • the exhaust gas duct 33 is located in position for communication of the inlet 34 with the exhaust gas port 25 to afford exhaust gas flow from the engine (not shown) through the exhaust gas passageway 23 in the lower unit 13, and through the exhaust gas duct 33 in the propeller 27 for exit through the rearward discharge opening 35.
  • the mounting of the propeller 27 on the propeller shaft 19 is such as to freely afford axial movement of the propeller 27 on the propeller shaft 19 relative to the discharge port 25 between a first position affording direct communication of the exhaust gas duct 33 with the discharge port 25 and a second more rearwardly located position (see FIG. 2) in which the propeller hub 29 is spaced from the discharge port to afford an annular opening or outlet 37 facilitating exhaust gas discharge forwardly of the discharge opening 35 at the rear of the propeller hub 29.
  • the water reaction will displace the propeller 27 forwardly on the propeller shaft 19 until the exhaust gas discharge port 25 and the forward portion of the propeller hub 29 are in partially telescopic relation to each other (FIG. 1), thereby affording direct communication. Under such circumstances, exhaust gas is discharged through the discharge opening 35 into the propeller slip stream rearwardly of the propeller Iblades 31.
  • the water reaction displaces the propeller 27 rearwardly on the propeller shaft 19 to provide an annular exhaust gas outlet 37 (FIG. 2) forwardly of the propeller blades 31 between the propeller hub 29 and the exhaust gas discharge port 25, thereby affording exhaust gas discharge into the propeller slip stream and not through the discharge opening 35 into the water into which the propeller 27 bites during rearward drive conditions.
  • Various means can be employed to afford axial shifting of the propeller 27 on the propeller shaft 19, while also affording rotary driving connection between the propeller shaft 19 and the propeller 27.
  • such means is in the form of complementary splines 39 on each of the propeller shaft 19 and the sleeve portion 30.
  • Means are provided for limiting travel of the propeller 27 on the propeller shaft 19. While various means can be employed, in the disclosed construction, such means is in the form of stops axially spaced at a distance greater than the length of the hub to afford withdrawal of the propeller hub 4 from telescopic relation to discharge port 35 and to provide the annular outlet 37 with sucient length to facilitate exhaust gas discharge when in reverse.
  • the propeller shaft is provided with a annular shoulder or stop 41 which is located forwardly of the splines 39 and which is engaged by the sleeve portion 30 to limit forward propeller movement and to establish the forward drive position of the propeller 27.
  • Rearward propeller movement is limited by a washer or stop 43 which is seated against a shoulder 45 on the propeller shaft 19 by a nut 47 and which extends radially to afford engagement by the sleeve portion 30 and thereby establish the rearward drive position of the propeller 27.
  • the propeller hub 29 and the discharge port 25 are provided with cooperating means for preventing exhaust gas escape therebetween when in telescopic relation. While various arrangements can be employed, in the disclosed construction, such means is in the form of a labynnth seal formed by a series of facing annular grooves 51 on the internal Wall of the discharge port 25 and on the external wall of the forward periphery of the propeller hub 29.
  • means can be provided for closing the exhaust gas discharge opening 35 when the propeller 27 is displaced to its rearward position to preclude exhaust gas discharge from the opening 35.
  • the washer 43a extends radially outwardly for engagement with the outer annular wall of the hub 29, thereby closing fthe opening 35 when the propeller 27 is in its rearwardmost position.
  • annular exhaust gas discharge area or outlet 53 which lhas a greater axial length than the annular outlet 37 afforded when the propeller 29 is in its rearward drive position.
  • a marine propulsion device 111 including a lower unit 113 having an exhaust gas passageway 123 terminating in a discharge port 135.
  • the lower unit 113 includes a gear case 117 into which there extends a drive shaft 157 carrying a drive bevel pinion 159 forming a part of a clutch mechanism 161.
  • a pair of bevel gears 1'63 and 165 which are rotatably mounted on a propeller shaft 119 extending through the discharge port 135.
  • Fixedly mounted on fthe propeller shaft 119 is a propeller 127 with a hub 129, a plurality of blades 131 extending from said hub 129, and an axial exhaust gas duct 133 which extends through said hub 129 and terminates at a rearward discharge opening 135.
  • means are provided in the gear case 117 for mounting the propeller shaft 119 for rotary movement and for axial movement whereby to rotatably drive the propeller shaft 119, while affording movement of the propeller 129 relative to the lower unit exhaust gas discharge port between a first position (see FIG. 5) associated with forward drive operation wherein the propeller hub 129 and lower unit discharge port 125 are partially telescopically related so as to afford exhaust gas discharge through the propeller hub outlet rearwardly of the propeller blades 131, and a second position (see FIG.
  • such mounting means comprises a pair of spaced bearings 169 and 171.
  • the bearing 169 is carried by the gear case 117 forwardly of the clutch member 161 and the bearing 171 is carried by a support member 173 located rearwardly of the clutch mechanism 161.
  • Means are also provided for axially shifting the propeller shaft 119 and, if desired, for coordinating such shifting with operation of the clutch mechanism 161 controlling transmission of rotary power from the bevel gears 163 and 165 to the propeller shaft 119.
  • the propeller shaft 119 includes an annular groove 175 which receives one leg 177 of a bell crank lever which forms a part of a mechanical actuating linkage and which is pivotally mounted to the lower unit housing 115.
  • the other end or leg 181 of the bell crank lever 179 is connected to a push rod or actuating link 183 such as has been commonly employed in the past to control clutch operation.
  • shifting of the clutch mechanism 161 in coordination with the axial movement of the propeller shaft 119 is afforded by means of one or more dogs or lugs 185 which are fixed to the propeller shaft 119 and which, in response to axial propeller shaft movement, are selectively positionable in a first or forward position (FIG. 5) drivingly engaging the bevel gear 163 to the propeller shaft 119, a second or rearward position (FIG. 6) drivingly engaging the bevel gear 165 to the propeller shaft 119, and a third or intermediate position wherein the dogs 185 are out of engagement with both bevel gears 163 and 165 and the drive is in neutral.
  • the lower unit discharge port 125 and the propeller hub 129 are provided with means for preventing the escape of exhaust gas when the propeller hub 129 and the lower unit discharge port are telescopically related. While various arrangements can be employed, in the disclosed construction such means is in the series of annular oppositely facing grooves 151 on the inner wall of the lower unit discharge port 125 and on the outer wall of the propeller hub 129.
  • FIGURES 7 and 8 Shown in FIGURES 7 and 8 is still another embodiment of the invention, which embodies an axially shiftable propeller shaft 219 and which is similar to the embodiments of FIGS. 5 and 6 except that the propeller shaft is biased into forward drive position andl axial propeller shifting is accomplished by a hydraulic actuator. More particularly, in the embodiment shown in FIGURES 5, 7, and 8, the propeller shaft 219 is biased forwardly by suitable means into the forward drive position and into engagement with a hydraulic actuator 291 which serves both to effect shifting of the clutch mechanism 161 and selective location of the propeller hub 29 relative to the lower unit exhaust gas discharge port 25. Various arrangements can be employed to provide the propeller shaft biasing means.
  • a helical spring 293 contained between a snap ring 295 mounted on the propeller shaft 219 and a seat 297 adjacent to a shoulder on a propeller bearing support member 273.
  • the disclosed biasing means provides the disclosed device wlth a fail-safe feature. Specifically, in the event of loss of hydraulic pressure in the actuator 291, the spring 293 will serve to assure that the drive is in forward position.
  • the actuator 291 includes a piston 299 having a stub shaft 201 which is rounded at its rearward end and engaged against the forward end of the propeller shaft 219 to facilitate rotation of the propeller shaft 219 relative thereto with a minimum of friction.
  • the specific details of the hydraulic actuator are not believed to be a part of this invention, except to the extent that the actuator should be capable of affording piston movement suicient to effect axial propeller shaft movement either merely to displace the propeller between forward and rearward positions or to accommodate shifting through forward, rearward and neutral conditions, in addition to affording propeller movement.
  • a marine propulsion device comprising a lower unit including an exhaust gas discharge passageway terminating in an exhaust gas discharge port, a rotatably mounted propeller shaft extending through said port, a clutch mechanism selectively connecting said propeller shaft in forward drive and in rearward drive and a propeller mounted on said propeller shaft for rotation therewith and including a blade having a rear face and an exhaust gas passageway having an inlet communicating with said exhaust gas discharge port and an outlet rearwardly of said blade, the improvement in combination therewith comprising means for affording underwater exhaust gas discharge through said port and into the water around said lower unit forwardly of the rear face of said propeller blade when said device is in reverse drive.
  • a device in accordance with claim 1 including means for preventing exhaust gas discharge through said outlet when said device is in said reverse drive.
  • a marine propulsion device comprising a lower unit including an exhaust gas discharge passageway terminating in an exhaust gas discharge port, a rotatably mounted propeller shaft extending through said port, and a propeller mounted on said propeller shaft for rotation therewith and including an exhaust gas duct having an inlet located in a position directly communicating with said exhaust gas discharge port, the improvement in combination therewith comprising means for affording axially shifting of said propeller relative to said discharge port between said position wherein said discharge port and said inlet are in direct communication and a second position wherein said discharge port and said inlet are in spaced relation to each other to provide an opening for exhaust gas discharge forwardly of said propeller.
  • a marine propulsion device according to claim 3 wherein said means for affording axial shifting of said propeller relative to said discharge port comprises cooperating means on said propeller shaft and on said propeller affording axial shifting of said propeller on said propeller shaft.
  • a marine propulsion device in accordance with claim 3 wherein said means for affording axial shifting of said propeller relative to said discharge port comprises means mounting said propeller shaft on said lower unit for axial movement relative to said lower unit, and means on said lower unit and on said propeller shaft for axially shifting said propeller relative to said discharge port.
  • a device in accordance with claim 5, wherein said means for axially shifting said propeller shaft comprises a mechanical linkage.
  • a device in accordance with claim 5 wherein said means for axially shifting said propeller shaft includes a hydraulic actuator.
  • a device in accordance with claim 7 including means biasing said propeller shaft into said position affording direct communication between said inlet and said lower unit exhaust gas discharge port and into engagement with said hydraulic actuator.
  • a marine propulsion device comprising a lower unit including a vertically extending drive shaft having a driving pinion, an exhaust gas discharge passageway terminating in an exhaust gas discharge port, a rotatably mounted propeller shaft extending through said port, a pair of gears meshed with said pinion and rotatably mounted in spaced relation on said propeller shaft, and a propeller mounted on said propeller shaft for rotation threrewith and including an exhaust gas passageway having an inlet located in a position directly communicating with said exhaust gas discharge port, the improvement in combination therewith comprising dog means fixed on said propeller shaft for selective engagement with said gears in response to axial shifting of said propeller shaft ot afford selective rotation of said propeller shaft by said drive shaft in forward and rearward drives, and means for axially shifting said propeller shaft relative to said lower unit between a first position wherein said dog means is engaged with one of said gears to afford forward drive and said discharge port and said inlet are in direct communication and a second position wherein said dog means is engaged with the other of said gears
  • said means for axially shifting said propeller shaft comprises a mechanical linkage.
  • a device in accordance with claim 9, wherein said means for axially shifting said propeller shaft includes a hydraulic actuator.
  • a device in accordance with claim 11 including means biasing said propeller shaft into said position affording direct communication between said inlet and said lower unit exhaust gas discharge port and into engagement with said hydraulic actuator.
  • a marine propulsion device comprising a lower unit including a vertically extending drive shaft housing having an exhaust gas discharge passageway terminating in an exhaust gas discharge port, a rotatably mounted propeller shaft extending through said port, and a propel- 1er mounted on said propeller shaft for rotation there- With and including an exhaust gas passageway having an inlet located in a position directly communicating with said exhaust gas discharge port, the improvement in combination therewith comprising means for axially shifting said propeller shaft relative to said lower unit between a rst position wherein said discharge port and said inlet are in direct communication and a second position wherein said discharge port and said inlet are in spaced relation to each other to provide an opening for exhaust gas discharge forwardly of said propeller.
  • a device in accordance with claim 13, wherein said means for axially shifting said propeller shaft comprises a mechanical linkage.
  • a device in accordance with claim 13, wherein said means for axially shifting said propeller shaft includes a hydraulic actuator.
  • a device in accordance with claim 15 including means biasing said propeller shaft into said position affording direct communication between said inlet and said lower unit exhaust gas discharge port and into engagement with said hydraulic actuator.

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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)
US627116A 1967-03-30 1967-03-30 Exhaust system for marine propulsion device Expired - Lifetime US3467051A (en)

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US62711667A 1967-03-30 1967-03-30

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4955088A (forum.php) * 1972-05-03 1974-05-28
US3871324A (en) * 1969-01-31 1975-03-18 Brunswick Corp Outboard propulsion unit exhaust discharge system
US4023353A (en) * 1975-12-03 1977-05-17 Hall Kimball P Multi-flow marine jet-propulsion apparatus
US4511339A (en) * 1978-12-20 1985-04-16 Kenneth Kasschau Through-hub exhaust propeller assembly
US4540369A (en) * 1983-02-22 1985-09-10 Richard Caires Counterrotating dual-propeller boat drive
US4545771A (en) * 1982-08-23 1985-10-08 Sanshin Kogyo Kabushiki Kaisha Propeller
US4676758A (en) * 1985-09-12 1987-06-30 Dennis Propellers, Inc. Combined cutter and bypass for propeller
US4778419A (en) * 1985-04-08 1988-10-18 Outboard Marine Corporation Reverse thrust propeller
US4820210A (en) * 1987-11-18 1989-04-11 Outboard Marine Corporation Lower gearcase shift mechanism for marine propulsion device
US4891026A (en) * 1988-07-22 1990-01-02 Outboard Marine Corporation Marine propeller including fish line trap
US5470263A (en) * 1994-04-28 1995-11-28 Brunswick Corporation Method and apparatus for improving reverse thrust of a marine drive
US20100144221A1 (en) * 2008-12-10 2010-06-10 Honda Motors Co., Ltd. Propulsion device for a marine motor
US9017118B1 (en) 2012-01-31 2015-04-28 Brp Us Inc. Gear case assembly for a marine outboard engine and method of assembly thereof
US10875615B1 (en) * 2018-08-20 2020-12-29 Brunswick Corporation Systems and methods for reducing porosity in propellers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093357A (en) * 1934-01-05 1937-09-14 Ici Ltd Outboard engine and driving and control mechanism therefor
US2601396A (en) * 1948-07-20 1952-06-24 Howarth P Henry Exhaust discharge for outboard motors
US2630775A (en) * 1950-04-28 1953-03-10 Elmer C Kiekhaefer Slip clutch reverse gear combination for outboard motors
US2948252A (en) * 1957-10-31 1960-08-09 Kiekhaefer Corp Propeller hub exhaust system
US3082647A (en) * 1954-08-05 1963-03-26 Fawick Corp Accessory drive control mechanism
US3182629A (en) * 1961-06-05 1965-05-11 Borg Warner Drive unit for boats
US3249083A (en) * 1963-12-16 1966-05-03 Outboard Marine Corp Marine jet propulsion

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093357A (en) * 1934-01-05 1937-09-14 Ici Ltd Outboard engine and driving and control mechanism therefor
US2601396A (en) * 1948-07-20 1952-06-24 Howarth P Henry Exhaust discharge for outboard motors
US2630775A (en) * 1950-04-28 1953-03-10 Elmer C Kiekhaefer Slip clutch reverse gear combination for outboard motors
US3082647A (en) * 1954-08-05 1963-03-26 Fawick Corp Accessory drive control mechanism
US2948252A (en) * 1957-10-31 1960-08-09 Kiekhaefer Corp Propeller hub exhaust system
US3182629A (en) * 1961-06-05 1965-05-11 Borg Warner Drive unit for boats
US3249083A (en) * 1963-12-16 1966-05-03 Outboard Marine Corp Marine jet propulsion

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3871324A (en) * 1969-01-31 1975-03-18 Brunswick Corp Outboard propulsion unit exhaust discharge system
JPS4955088A (forum.php) * 1972-05-03 1974-05-28
US4023353A (en) * 1975-12-03 1977-05-17 Hall Kimball P Multi-flow marine jet-propulsion apparatus
US4511339A (en) * 1978-12-20 1985-04-16 Kenneth Kasschau Through-hub exhaust propeller assembly
US4545771A (en) * 1982-08-23 1985-10-08 Sanshin Kogyo Kabushiki Kaisha Propeller
US4540369A (en) * 1983-02-22 1985-09-10 Richard Caires Counterrotating dual-propeller boat drive
US4778419A (en) * 1985-04-08 1988-10-18 Outboard Marine Corporation Reverse thrust propeller
US4676758A (en) * 1985-09-12 1987-06-30 Dennis Propellers, Inc. Combined cutter and bypass for propeller
US4820210A (en) * 1987-11-18 1989-04-11 Outboard Marine Corporation Lower gearcase shift mechanism for marine propulsion device
US4891026A (en) * 1988-07-22 1990-01-02 Outboard Marine Corporation Marine propeller including fish line trap
US5470263A (en) * 1994-04-28 1995-11-28 Brunswick Corporation Method and apparatus for improving reverse thrust of a marine drive
US20100144221A1 (en) * 2008-12-10 2010-06-10 Honda Motors Co., Ltd. Propulsion device for a marine motor
EP2196389A1 (en) * 2008-12-10 2010-06-16 Honda Motor Co., Ltd. Propulsion device for a marine motor
US8105122B2 (en) 2008-12-10 2012-01-31 Honda Motor Co., Ltd. Propulsion device for a marine motor
US9017118B1 (en) 2012-01-31 2015-04-28 Brp Us Inc. Gear case assembly for a marine outboard engine and method of assembly thereof
US10875615B1 (en) * 2018-08-20 2020-12-29 Brunswick Corporation Systems and methods for reducing porosity in propellers

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BE712283A (forum.php) 1968-07-15
CA929039A (en) 1973-06-26

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