US2570509A - Outboard motor underwater exhaust valve - Google Patents

Outboard motor underwater exhaust valve Download PDF

Info

Publication number
US2570509A
US2570509A US88117A US8811749A US2570509A US 2570509 A US2570509 A US 2570509A US 88117 A US88117 A US 88117A US 8811749 A US8811749 A US 8811749A US 2570509 A US2570509 A US 2570509A
Authority
US
United States
Prior art keywords
exhaust
motor
water
casing
outboard motor
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
US88117A
Inventor
John C Bandli
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.)
SCOTT ATWATER Manufacturing Co
SCOTT-ATWATER MANUFACTURING Co
Original Assignee
SCOTT ATWATER Manufacturing Co
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 SCOTT ATWATER Manufacturing Co filed Critical SCOTT ATWATER Manufacturing Co
Priority to US88117A priority Critical patent/US2570509A/en
Application granted granted Critical
Publication of US2570509A publication Critical patent/US2570509A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/12Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for submerged exhausting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63HMARINE PROPULSION OR STEERING
    • B63H20/00Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/24Arrangements, apparatus and methods for handling exhaust gas in outboard drives, e.g. exhaust gas outlets
    • B63H20/245Exhaust gas outlets
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines

Definitions

  • Fig. l is a view in side elevation of an outboard motor
  • Casing It has an exhaust passage Illa extending vertically therethrou'gh which com municates with the cylinder or cylinders 12 through cylinder exhaust ports i 21).
  • Casing 1 11a has a lower terminal portion b in which is formed the exhaust discharge opening Itc.
  • 'Portion lilb projects laterally some distance and the casing in said portion in the embodiment of the invention illustrated, is streamlinedso that opening 10c and :a section of portion Nib parallel to the plane of said opening is of cuspid shape.
  • a valve 24 is provided, and whil the form and location of this valve could :be varied, in the embodiment of the invention illustrated said 'valve comprises a thin resilient plate. Said plat is secured at its lower and straight edge portion to -a plate 25 which extends across the bottom of casing Il 'fl. Plate 7.5., :together with th propeller "shaft housing 26, are secured to :casing .I t in any suitable manner, by bieing'bolted thereto.
  • Valve 2-4 can be secured to plate v25 in any suitable manner, :as by leeing welded, riveted, bolted or brazed thereto.
  • valve 324 In operation theimotor will b operated .as usual and the exhaust gases willtpassfrom'the cylinder or cylinders [.2 through exhaust port :or lports 12b into the 'exhaustpassage 110a.
  • the resiliency of valve 324 holds the same against :the end of casing Illaso thattheop'ening Hlciis closedwhen the motor is inotirunning. This at :said time .retards the entry TOT water into the casin so that substantially no water now enters the exhaust passage.
  • An outboard'motonstructure having in com- :bination, .a cylinder .from which exhaust gases pass, a casing having an exhaust passage exitendingtherethrough connected to said cylinder, said casing. extending :downwardly and having a terminal discharge opening at its lower end disposed .well .belowthe surface of the water when .said motor is in operative position, a valve comprising aresilient sheet :secured to said casing 'iat oneiside offsaid opening and adapted'to close said opening, said valve normally being held closed by its resiliency but adapted to-be opened zpresent construction usinguvalveadgthis auxiliary byltheiexhausttdfi-saidlmotor,
  • an outboard motor including a. powerhead at its upper portion, a driveshaft casing extending downwardly quite a distance from said powerhead, said exhaust casing formed to provide a passage for exhaust gases from said power head to the lower end of said exhaust casing, the lower end of said exhaust casing formed to provide a below water level discharge opening, and a resilient plate valve mounted over said opening and biased to close the latter thereby precluding entry of water into the exhaust passage, said resilient valve opening only under the impulse of exhaust gases for discharging the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

Oct. 9 5 J. c. BANDLl OUTBOARD MOTOR UNDERWATER EXHAUST VALVE Filed April 18, 1949 Patented Oct. 9, 1951 OUTBOARD MoToR UNDERWATER EXHAUST VALVE,
John C. Bandli, Minneapolis, Minn; assignor to Scott-Atwater Manufacturing Company, Minneapolis, Minn., a corporation of Minnesota Application April 18, 1949, Serial No. 88,117
This invention relates to an outboard motor and particularly to a control means or valving means for controlling the exhaust from said motor. When an outboard motor of the modern type is in operative position on a boat, the casing of said motor with an exhaust passage extending therethrough has a terminal portion disposed below the surface of the water and said passage has a discharge opening for the exhaust disposed below the surface of the water. It has been the universal practice to have this discharge passage open at its bottom. As a result of the exhaust passage being open in the water at its lower end when the motor is at or very near a stopped condition, the water enters the exhaust passage and rises therein for a considerable distance. When the motor is running at certain speeds the exhaust gases must clear this water from the exhaust passage thus causing poor and unreliable performance.
It has been the universal practice to have an auxiliary exhaust opening extending from the said exhaust passage and disposed above the surface of the water so that the exhaust gases can be discharged through this auxiliary opening at idling or slow speeds. When the motor speed is increased the exhaust gases will force the water out of the exhaust passage in the casing, and discharge below the water surface. With the auxiliary exhaust passage above the water line, when the motor speed is increased, a point is reached .at which the exhaust gases clear the water from the exhaust passage and break through to the ;water surface through and above the exhaust opening. This point is called the break thru.
Unstable speed conditions exist at throttle settings where underwater exhaust break thru occurs, resulting in erratic motor operation and carburetor action in the conventional motor. As the break thru occurs, the engine will suddenly increase in speed. This occurrence at constant throttle settings causes an' erroneous metering ofthe carburetor which is practically impossible to correct by conventional means as now provided on motors.
Athigher speeds the impedance of the present structure to the discharge of exhaust at the underwater outlet is no greater than the usual opposing ef'fect of water in-flow in the conventional open system of the prior art. Tests have shown that top revolutions per minute and positive indications of power output are as great as or greater than attained with conventional systems heretofore used.
It is an object of thisinvention to. provide an 3 Claims. (Cl. 115-17) outboard motor having an exhaust passage, a discharge opening for said passage disposed below the surface of the water, together with means at or near the discharge opening which permits substantially only an outward fiow of gases and liquids from said exhaust passage.
It is also an object of this invention to provide an outboard motor having an exhaust passage, said passage having a lower or terminal portion disposed below the surface of the water and having a discharge opening in said terminal portion, together with means controlling said discharge opening and being movable by the exhaust gases.
It is a further object of the invention to provide an outboard motor comprising one or more cylinders, a casing having an exhaust passage leading from said cylinder or cylinders and having a lower portion disposed below the surface of the water and provided with a discharge opening together with a valve at or adjacent said discharge opening and resiliently urged toward closed position so that the entry of water into the casing and exhaust passage is substantially prevented, said motor preferably having only the one exhaust discharge opening.
It is more specifically an object of the invention to provide an outboard motor having one or more cylinders and having a casing with an exhaust passage extending therethrough, said casing having a lower portion normally disposed below the surface of the water when said motor is in operative position on a boat, said portion having a discharge opening together with a valve extending across said discharge opening and resiliently held in closed position when the motor is not running, which valve may take the form of a thin resilient plate secured at one side of said casing.
These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:
Fig. l is a view in side elevation of an outboard motor;
Fig. 2 is a partial vertical section through said. motor showing a cylinder and exhaust passage;
Fig. 3 is a partial vertical section similar to Fig. 2 and shown on an enlarged scale; and
Fig. 4 is a view in side elevation as seen from the right of Fig. 3.
Referrin to the drawings, an outboard motor is shown comprising a casing [0. A hood II is disposed above casing I0 having a lower portion 1 laand a top portion llb, which hood encloses th power head of the motor which in turn comprises one or more cylinders I2 having the usual pistons l3 therein, which pistons have the con necting rods [4. Cylinder I2 is shown as having a cap or head l2a thereon in which is disposed the usual spark plug [5. A steering lever I6 is shown, as is also a spark adjusting lever 17. The casing I i! is pivoted to a bracket 19 adapted to clamp the motor to a boat transom, which bracket has therein one or more screw clamps 20 provided with operating handles .21.. The usual propeller 21 of the outboard motor is also shown in Fig. 1. Casing It has an exhaust passage Illa extending vertically therethrou'gh which com municates with the cylinder or cylinders 12 through cylinder exhaust ports i 21). Casing 1 11a has a lower terminal portion b in which is formed the exhaust discharge opening Itc. 'Portion lilb projects laterally some distance and the casing in said portion in the embodiment of the invention illustrated, is streamlinedso that opening 10c and :a section of portion Nib parallel to the plane of said opening is of cuspid shape. A valve 24 is provided, and whil the form and location of this valve could :be varied, in the embodiment of the invention illustrated said 'valve comprises a thin resilient plate. Said plat is secured at its lower and straight edge portion to -a plate 25 which extends across the bottom of casing Il 'fl. Plate 7.5., :together with th propeller "shaft housing 26, are secured to :casing .I t in any suitable manner, by bieing'bolted thereto. Valve 2-4 can be secured to plate v25 in any suitable manner, :as by leeing welded, riveted, bolted or brazed thereto.
In operation theimotor will b operated .as usual and the exhaust gases willtpassfrom'the cylinder or cylinders [.2 through exhaust port :or lports 12b into the 'exhaustpassage 110a. The resiliency of valve 324 .holds the same against :the end of casing Illaso thattheop'ening Hlciis closedwhen the motor is inotirunning. This at :said time .retards the entry TOT water into the casin so that substantially no water now enters the exhaust passage. When the motor is running .at .110 :speed or idling the valve :is substantially closed :sothat the exhaust passage isthus kept substantiallyclear of water andithe :water does snotrise appreciably in said :passage as is the common "occurrence when :the exhaust discharge :passage is openias .in the :prior art. The :exhaust pressure, in thenormalrangeiofpoperationtis of sufficient magnitude to openvalve z l and permit the escape of the exhaust gases. When thezexnhaus't pressure is relieved, 'valve24 moves toward closed .position, At .all speeds therefore the exhaust passage is kept substantially :free of water.
The provision of valve .24 has madeiaaleryremarkable difference in the operation .of the motor. Heretofore, as stated, when the :motor was operating at low speeds or :idling, water would rise in the exhaust passage to ia considerable height. When the motor was :accelerated, the exhaust gases would haveto'forceithis water out of the exhaust passage. The back pressure arising from this :expulsionJo'f water icaused. sluggish operation of :the motor, LandgresuIted inerratio action and instability or .speed and carburetor action, .particularly upon changing .sp'eed. Since the exhaust pressure at low and idling speeds Was not sufficient to expel-the WaterLin th'e =:exhaust :passage, an auxiliary exhaust opening was provided well abovetthe water line; giving :rise to objectionable noise at all times. With the exhaust opening is not necessary. At the lower and idling speeds the motor runs with almost unbelievable quietness. This is an accomplishment never before known in an outboard motor. Formerly the exhaust through the auxiliary exhaust opening was quite noisy. The exhaust discharge now occurs a very regular and uni- .form manner .at .all speeds and the action of the motor carburetor during the acceleration period has been vastly improved. In fact the provision of valve 24 has made possible much lower speeds than were heretofore attainable. The motor can now be operated with great stability below 400 revolutions per minute.
The expansion chamber formed by the exhaust passage is appreciably increased in size by the elimination of practically all water. It is also cooled by being "submerged through a considerable .portion of its extent. Two-cycle motors with underwater exhaust systems operate more 'efiiciently when the volume-of the chamber connecting the cylinder with the underwater outlet is increased. Also a further increase in motor efiiciency results when the chamber is cooled, since the hot exhaust gases contract as they are cooled.
An outboard motor using the subject invention utilizes these benefits to a greater degree than heretofore possible. Unstable operation results if the expansion chamber erratically varies in size as in the conventional outboard motor heretofore known in the art, due to rise and fall of the water level :in the open underwater exhaust passage. Such variation in the volume of the exhaust passage arose from various causes, such a pulsation of the exhaust pressure, wind and wave effects on boat attitude and changing of boat'trim as passengers change their positions, etc.
From the above description'it'willtbeseen that .I have provided means for greatly .improving the operation of an outboard motor. As above stated, the exhaust passage is kept clear and the exhaust gases are not compelled to move appreciable amounts rof -water from the exhaust passage. The operation of the .motor has been immensely improved and'the noise of operation at all but very highspeeds has been very greatly reduced. The invention is simple and yet highly efficient and in fact'constitutes a wonderful discovery and advance in the :art. The .structurehas'been amply demonstrated in actualipractice and found to be very successful and .efficient.
It will of course 'be understood that various changesmay .be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in ..-a device capable of carrying .out :the objects above setforth, in .thetparts .andrcombinations of parts disclosedand defined in the appended claims.
"What :is claimed :is:
1. An outboard'motonstructurehaving in com- :bination, .a cylinder .from which exhaust gases pass, a casing having an exhaust passage exitendingtherethrough connected to said cylinder, said casing. extending :downwardly and having a terminal discharge opening at its lower end disposed .well .belowthe surface of the water when .said motor is in operative position, a valve comprising aresilient sheet :secured to said casing 'iat oneiside offsaid opening and adapted'to close said opening, said valve normally being held closed by its resiliency but adapted to-be opened zpresent construction usinguvalveadgthis auxiliary byltheiexhausttdfi-saidlmotor,
2. In an outboard motor including a. powerhead at its upper portion, a driveshaft casing extending downwardly quite a distance from said powerhead, said exhaust casing formed to provide a passage for exhaust gases from said power head to the lower end of said exhaust casing, the lower end of said exhaust casing formed to provide a below water level discharge opening, and a resilient plate valve mounted over said opening and biased to close the latter thereby precluding entry of water into the exhaust passage, said resilient valve opening only under the impulse of exhaust gases for discharging the latter. Y
3. The structure set forth in claim 2 wherein said plate valve comprises a resilient sheet, said sheet being secured along its lower edge to an edge of said discharge opening, said sheet being 6 a normally held in closed position by its resiliency but adapted over its upper portions to uncover said opening under exhaust impulse.
JOHN C. BANDLI.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS
US88117A 1949-04-18 1949-04-18 Outboard motor underwater exhaust valve Expired - Lifetime US2570509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US88117A US2570509A (en) 1949-04-18 1949-04-18 Outboard motor underwater exhaust valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US88117A US2570509A (en) 1949-04-18 1949-04-18 Outboard motor underwater exhaust valve

Publications (1)

Publication Number Publication Date
US2570509A true US2570509A (en) 1951-10-09

Family

ID=22209446

Family Applications (1)

Application Number Title Priority Date Filing Date
US88117A Expired - Lifetime US2570509A (en) 1949-04-18 1949-04-18 Outboard motor underwater exhaust valve

Country Status (1)

Country Link
US (1) US2570509A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911853A (en) * 1973-02-08 1975-10-14 Outboard Marine Corp Low profile outboard with in-line engine
US4643685A (en) * 1984-06-29 1987-02-17 Kawasaki Jukogyo Kabushiki Kaisha Water jet propelled craft
US4891025A (en) * 1987-03-27 1990-01-02 Ab Volvo Penta Arrangement in boat propeller installations
US4897061A (en) * 1988-08-04 1990-01-30 Brunswick Corporation Gearcase exhaust vent for a marine propulsion system
US5554057A (en) * 1992-12-14 1996-09-10 Yamaha Hatsudoki Kabushiki Kaisha Exhaust treatment for outboard motor
US5603214A (en) * 1993-01-29 1997-02-18 Linde Aktiengesellschaft Exhaust system for an internal combustion engine and method of operation thereof
US20130228079A1 (en) * 2010-11-11 2013-09-05 Koninklijke Philips Electronics N.V. Food steamer
GB2574680A (en) * 2018-07-12 2019-12-18 Cox Powertrain Ltd An exhaust system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US806083A (en) * 1905-06-12 1905-11-28 Jerome B Roseboom Muffler for internal-combustion engines.
GB191108243A (en) * 1911-04-01 1912-03-14 William Hamilton Martin Improvements in or relating to the Exhausting Means of Internal Combustion Engines.
US2216496A (en) * 1938-07-29 1940-10-01 Kenneth H Mackay Marine propulsion assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US806083A (en) * 1905-06-12 1905-11-28 Jerome B Roseboom Muffler for internal-combustion engines.
GB191108243A (en) * 1911-04-01 1912-03-14 William Hamilton Martin Improvements in or relating to the Exhausting Means of Internal Combustion Engines.
US2216496A (en) * 1938-07-29 1940-10-01 Kenneth H Mackay Marine propulsion assembly

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911853A (en) * 1973-02-08 1975-10-14 Outboard Marine Corp Low profile outboard with in-line engine
US4643685A (en) * 1984-06-29 1987-02-17 Kawasaki Jukogyo Kabushiki Kaisha Water jet propelled craft
US4891025A (en) * 1987-03-27 1990-01-02 Ab Volvo Penta Arrangement in boat propeller installations
US4897061A (en) * 1988-08-04 1990-01-30 Brunswick Corporation Gearcase exhaust vent for a marine propulsion system
US5554057A (en) * 1992-12-14 1996-09-10 Yamaha Hatsudoki Kabushiki Kaisha Exhaust treatment for outboard motor
US5603214A (en) * 1993-01-29 1997-02-18 Linde Aktiengesellschaft Exhaust system for an internal combustion engine and method of operation thereof
US20130228079A1 (en) * 2010-11-11 2013-09-05 Koninklijke Philips Electronics N.V. Food steamer
US10524604B2 (en) * 2010-11-11 2020-01-07 Koninklijke Philips N.V. Food steamer
GB2574680A (en) * 2018-07-12 2019-12-18 Cox Powertrain Ltd An exhaust system
GB2574680B (en) * 2018-07-12 2020-08-19 Cox Powertrain Ltd An exhaust system
US10940929B2 (en) * 2018-07-12 2021-03-09 Cox Powertrain Limited Exhaust system
US20210114704A1 (en) * 2018-07-12 2021-04-22 Cox Powertrain Limited Exhaust system
US11932368B2 (en) * 2018-07-12 2024-03-19 Cox Powertrain Limited Exhaust system

Similar Documents

Publication Publication Date Title
US3918418A (en) Marine engine cooling system employing a thermostatic valve means and a pressure relief valve means
US5133307A (en) Air intake system for marine propulsion unit engine
US2570509A (en) Outboard motor underwater exhaust valve
US2351050A (en) Outboard motor
US3118433A (en) Air cooled internal combustion engine
US5833501A (en) Cavitation control for marine propulsion system
US3265050A (en) Carburetor construction
US2470366A (en) Automatic spark advance mechanism
US3291462A (en) Carburetors comprising an automatic auxiliary starting device
US4357912A (en) Engine cooling system
JP2530822B2 (en) Drain removal device for outboard motors
US4897061A (en) Gearcase exhaust vent for a marine propulsion system
US4040399A (en) Back draft carburetor for two cycle engines
US4140089A (en) Pressure controlled engine cooling system
JP2911006B2 (en) Fuel supply device for internal combustion engine
JPH11301591A (en) Outboard motor
US2069315A (en) Internal combustion engine
US4160425A (en) Fuel system for aquatic craft
JP3833316B2 (en) Marine Engine Fuel Supply Device
JPH0988583A (en) Engine for small surface boat
US4573932A (en) Electrical fluid pumping device including first and second pumping portions
US1869749A (en) Exhaust tube for internal combustion engines
FR2437501A1 (en) CARBURETOR FOR INTERNAL COMBUSTION ENGINES WITH ACCELERATION PUMP
US1304961A (en) Boat bailing means
US2503036A (en) Carburetor