US2570509A - Outboard motor underwater exhaust valve - Google Patents
Outboard motor underwater exhaust valve Download PDFInfo
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 30
- 239000007789 gas Substances 0.000 description 14
- 230000001133 acceleration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 210000003464 cuspid Anatomy 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust 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
- F01N13/12—Exhaust 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
-
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations 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
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)
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)
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 |
-
1949
- 1949-04-18 US US88117A patent/US2570509A/en not_active Expired - Lifetime
Patent Citations (3)
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)
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 |