US3805751A - Drainage system for two-cycle engine - Google Patents

Drainage system for two-cycle engine Download PDF

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Publication number
US3805751A
US3805751A US00280462A US28046272A US3805751A US 3805751 A US3805751 A US 3805751A US 00280462 A US00280462 A US 00280462A US 28046272 A US28046272 A US 28046272A US 3805751 A US3805751 A US 3805751A
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US
United States
Prior art keywords
engine
line
crank case
residuals
cylinders
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
US00280462A
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English (en)
Inventor
E Resnick
J Vandenberg
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.)
Brunswick Corp
Original Assignee
Brunswick Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brunswick Corp filed Critical Brunswick Corp
Priority to US00280462A priority Critical patent/US3805751A/en
Priority to AU58374/73A priority patent/AU475258B2/en
Priority to CA177,515A priority patent/CA989314A/en
Priority to GB3780473A priority patent/GB1417227A/en
Priority to IT51985/73A priority patent/IT990229B/it
Priority to JP48090797A priority patent/JPS5249536B2/ja
Priority to SE7311035A priority patent/SE400808B/xx
Priority to DE2340934A priority patent/DE2340934C3/de
Priority to BE134576A priority patent/BE803607A/xx
Application granted granted Critical
Publication of US3805751A publication Critical patent/US3805751A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
    • F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
    • F02M33/04—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the intake passage
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the present invention satisfactorily solves the foregoing problem by providing a system for a two-cycle engine in which the drainage is recycled so that it is not necessary to drain it overboard from an outboard motor nor is there any puddle created in the crankcase during engine idle whereby a smoky exhaust occurs when engine speed increases.
  • the present invention utilizes a system in which drainage flow to the upper bearing is substantially prevented during engine idle and the flow to the upper bearing is increased as the speed of the engine is increased.
  • the present invention employs a system in which a high suction in the transfer passage of the upper cylinder during idle is utilized to divert most of the flow from the lower crank chamber of the crankcase to the transfer passage of the upper cylinder rather than to allow the drainage to flow to the upper bearing during idle.
  • a high suction in the transfer passage of the upper cylinder during idle is utilized to divert most of the flow from the lower crank chamber of the crankcase to the transfer passage of the upper cylinder rather than to allow the drainage to flow to the upper bearing during idle.
  • An object of this invention is to provide a drainage recycle system for an outboard motor.
  • This invention relates to an improvement in a twocycle internal combustion engine having a crankcase, a rotatably mounted crankshaft, and bearing means to support the crankshaft.
  • the engine has at least two cylinders with a piston disposed in each of the cylinders and connected to the crankshaft.
  • the crankshaft has a separate chamber for each of the cylinders with separate first means to supply a mixture of gasoline and oil from each of the chambers of the crankcase to the cooperating cylinder. Second means supplies drainage from only one of the chambers of the crankcase to at least one of the bearing means.
  • the improvement comprises the second supply means having means to control the flow of drainage from the one chamber of the crankcase to the one bearing means in accordance with the speed of the engine with the control means allowing flow of a significant quantity of drainage to the one bearing means only when the speed of the engine exceeds a predetermined speed.
  • FIG. 1 is a schematic elevational view of a two-cycle internal combustion engine in which the drainage system of the present invention is employed;
  • FIG. 2 is a sectional view of a portion of one of the cylinders of the engine of FIG. 1 with which the drain age system of the present invention is employed;
  • FIG. 3 is a sectional view, partly in elevation, of a portion of the engine using the drainage system of the present invention
  • FIG. 4 is an enlarged sectional view of a portion of one of the cylinders and showing details of the drainage system of the present invention.
  • FIG. 5 is a sectional view showing a portion of the drainage system of the present invention.
  • FIG. 1 there is shown a two-cycle internal combustion engine 10,used as an outboard motor.
  • the engine 10 is shown supported on a driveshaft housing 11 of the outboard motor.
  • the engine 10 has a pair of horizontally disposed upper and lower cylinders 12 and 13 (see FIG. 3) with the cylinders 12 and 13 having pistons 14 and 15, respectively, slidably disposed therein.
  • Each of the piston 14 and 15 is connected to cranks 16 and 17 of a crankshaft 18 by connecting rods 19 and 20, respectively.
  • crankshaft 18 is supported within a crankcase 21, which is divided into upper and lower crank chamber 22 and 23 by a bearing block 24 and reed valve.
  • An upper bearing 25 supports the upper end of the crankshaft 18 while a lower bearing 26 supports the lower end of the crankshaft 18.
  • the mixture of gasoline and oil along with air is introduced through a carburetor 27 into the crank chambers 22 and 23 in the normal manner through reed valve block 24.
  • the mixture is introduced into the lower crank chamber 23 of rotation of the crankshaft 18 after the mixture is introduced into the upper crank chamber 22 and vice versa.
  • Drainage is supplied from the lower crank chamber 23 of the crankcase 21 to the upper bearing 25 through a conduit 30 (see FIG. 1), a fitting 31, and a conduit 32.
  • the fitting 31 is T-shaped and has a first passage 33 (see FIG. 4) communicating with a passage 34 in the conduit 30 and a second passage 35 communicating with a passage 36 in the conduit 32.
  • the first passage 33 has a larger diameter than the second passage 35.
  • the diameters of the passage 34 in the conduit 30 and the passage 36 in the conduit 32 are the same and are larger than either the first passage 33 or the second passage 35 in the fitting 31.
  • the fitting 31 has a third passage 37 connected to the first passage 33 at the junction of the first passage 33 and the second passage 35.
  • the third passage 37 communicates with the transfer passage 28 of the upper cylinder 12.
  • the third passage 37 of the fitting 31 has a smaller diameter than either the second passage 35 or the first passage 33.
  • the passage 36 in the conduit 32 communicates with the upper bearing 25 through an ejector fitting 38 (see FIG. in an end cap 39.
  • the end cap 39' covers the upper bearing 25 as shown in FIG. 3.
  • the fitting 38 has a passage 40 of a diameter substantially the same as the diameter of the third passage 37 of the fitting 31.
  • the third passage 37 and the passage 40 in the fitting 38 form restrictions.
  • the passage 33 in the fitting 31 has a diameter of 0.078 inch and the passage 35 in the fitting has a diameter of 0.040 inch.
  • the passage 37 in the fitting 31 has a diameter of 0.030 inch while the passage 40 in the fitting 38 has a diameter of 0.028 inch.
  • the pressure for supplying the mixture of oil, gasoline, and air from the bottom of the lower crank chamber 23 of the crankcase 21 to the passage 34 in the conduit 30 occurs at the same time as the suction is produced in the transfer passage 28 of the upper cylinder 12.
  • a portion of the drainage flowing from the passage 34 in the conduit through the first passage 33 in the fitting 31 is sucked into the third passage 37 by the suction in the transfer passage 28.
  • the suction of the transfer passage 28 of the upper cylinder 12 weakens as the speed of the engine increases, the suction in the transfer passage 28 becomes less effective as the engine speed increases so that the drainage tends to flow through the second passage 35 in the fitting 31 to the upper bearing 25. Therefore, the upper bearing 25 receives a sufficient quantity of lubricant as the speed of the engine increases; this is when the upper bearing 25 requires the most lubricant.
  • the pressure supplying the drainage from the lower crank chamber 23 of the crankcase 21 through the passage 34 in the conduit 30 increases as the speed of the engine increases, this increased pressure also enables most, if not all, of the drainage to flow through the second passage 35 in the fitting 31 to the upper bearing 25 rather than through the third passage 37.
  • the weakening of the suction in the transfer passage 28 as the engine speed increases along with the increase in the drainage flow from the lower crank chamber 23 of the crankcase 21 as the engine speed increases results in a greater flow of drainage to the upper bearing 25 as the speed of the engine increases. Therefore, below a predetermined speed, the present invention prevents most, if not all, of the drainage from being supplied to the upper bearing 25.
  • the upper bearing 25 does not receive too much lubricant at idle, and puddling does not create a problem.
  • the conduit 30 preferably has a check valve 41 therein to prevent any reverse flow to the lower crank chamber 23 of the crankcase 21 when suction exists in the lower crank chamber 23 of the crankcase 21.
  • the valve 41 would normally be in the fitting (not shown) between the conduit 30 and lower crank chamber 23.
  • the present invention has shown and described the cylinders of the engine 10 as being horizontally disposed, it should be understood that such is not a requisite for satisfactory operation of the present invention.
  • the cylinders could be vertically disposed.
  • the present invention may be utilized to lubricate any bearing, other than the lowermost bearing, of a two-cycle internal combustion engine.
  • An advantage of this invention is that it eliminates overboard drainage of an outboard motor. Another advantage of this invention is that it adds further assurance that an outboard motor does not affect the environment in which it is operating. A further advantage of this invention is that it increases the efficiency and performance for the engine since there is more complete combustion.
  • means for recirculating the residual oil and gas mixture accumulating in the crank case thereof comprising;
  • a third line connected to one of said first and second lines and communicating with the upper main hearing of the engine
  • the minimum cross-sectional area occurring within said third line being sufficiently smaller than the minimum cross-sectional area occurring within said first and second lines, so that substantially all of the residuals are recirculated into the transfer passage of said one cylinder at idle, and substantially all of said residuals are recirculated to said upper main bearing at high engine rpm.
  • means for recirculating the residual oil and gas mixture accumulating in the crank case thereof comprising;
  • said flow dividing means comprises a T-shaped fitting the extremities of which are connected to said three lines and wherein that portion of said fitting connected to said third line is substantially smaller than those portions connected to said first and second lines.
  • the device of claim 3 further including a check valve in said first line to prevent flow into said crank case.
  • a two cycle engine utilizing crank case compression having at least two cylinders and means for introducing a fuel-air mixture into each of said cylinders, means for recirculating the residual oil and gas mixture accumulating in the crank case thereof, comprising;

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
US00280462A 1972-08-14 1972-08-14 Drainage system for two-cycle engine Expired - Lifetime US3805751A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00280462A US3805751A (en) 1972-08-14 1972-08-14 Drainage system for two-cycle engine
AU58374/73A AU475258B2 (en) 1972-08-14 1973-07-23 Drainage system for two-cycle engine
CA177,515A CA989314A (en) 1972-08-14 1973-07-27 Drainage system for two-cycle engine
GB3780473A GB1417227A (en) 1972-08-14 1973-08-09 Two-stroke internal combustion engine
IT51985/73A IT990229B (it) 1972-08-14 1973-08-13 Impianto di drenaggio per motore a due tempi
JP48090797A JPS5249536B2 (en, 2012) 1972-08-14 1973-08-13
SE7311035A SE400808B (sv) 1972-08-14 1973-08-13 Anordning vid tvatakts forbrenningsmotor
DE2340934A DE2340934C3 (de) 1972-08-14 1973-08-13 Zweitakt-Brennkraftmaschine mit einer abweichend von der Horizontalen angeordneten Kurbelwelle
BE134576A BE803607A (fr) 1972-08-14 1973-08-14 Systeme de purge pour moteur a deux temps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00280462A US3805751A (en) 1972-08-14 1972-08-14 Drainage system for two-cycle engine

Publications (1)

Publication Number Publication Date
US3805751A true US3805751A (en) 1974-04-23

Family

ID=23073195

Family Applications (1)

Application Number Title Priority Date Filing Date
US00280462A Expired - Lifetime US3805751A (en) 1972-08-14 1972-08-14 Drainage system for two-cycle engine

Country Status (9)

Country Link
US (1) US3805751A (en, 2012)
JP (1) JPS5249536B2 (en, 2012)
AU (1) AU475258B2 (en, 2012)
BE (1) BE803607A (en, 2012)
CA (1) CA989314A (en, 2012)
DE (1) DE2340934C3 (en, 2012)
GB (1) GB1417227A (en, 2012)
IT (1) IT990229B (en, 2012)
SE (1) SE400808B (en, 2012)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121551A (en) * 1976-07-28 1978-10-24 Outboard Marine Corporation Drain recycle system for two-cycle engine
US4195600A (en) * 1976-04-15 1980-04-01 Yamaha Hatsudoki Kabushiki Kaisha Crankcase chamber compression type two cycle internal combustion engines
US4590897A (en) * 1984-11-13 1986-05-27 Brunswick Corp. Idle fuel residual storage system
US4599979A (en) * 1984-08-09 1986-07-15 Outboard Marine Corporation Upper crankshaft bearing lubrication system for two-cycle engine
US4820213A (en) * 1987-10-05 1989-04-11 Outboard Marine Corporation Fuel residual handling system
US4836152A (en) * 1988-02-19 1989-06-06 Brunswick Corporation Exhaust heated crankcase for 2-cycle marine engine
US4846136A (en) * 1988-02-26 1989-07-11 Brunswick Corporation Exhaust heated induction air for two-cycle engine
US4890587A (en) * 1988-01-29 1990-01-02 Outboardmarine Corporation Fuel residual handling system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52154063U (en, 2012) * 1976-05-19 1977-11-22

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR541953A (fr) * 1921-10-04 1922-08-04 Dispositif de graissage pour moteurs à deux temps
US1606424A (en) * 1924-04-03 1926-11-09 Johnson Bros Engineering Corp Oiling system for gas engines
US3132635A (en) * 1962-07-30 1964-05-12 Outboard Marine Corp Internal combustion engine with crankcase compression
US3395679A (en) * 1966-08-17 1968-08-06 Brunswick Corp Two-cycle engine and cylinder block therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR541953A (fr) * 1921-10-04 1922-08-04 Dispositif de graissage pour moteurs à deux temps
US1606424A (en) * 1924-04-03 1926-11-09 Johnson Bros Engineering Corp Oiling system for gas engines
US3132635A (en) * 1962-07-30 1964-05-12 Outboard Marine Corp Internal combustion engine with crankcase compression
US3395679A (en) * 1966-08-17 1968-08-06 Brunswick Corp Two-cycle engine and cylinder block therefor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4195600A (en) * 1976-04-15 1980-04-01 Yamaha Hatsudoki Kabushiki Kaisha Crankcase chamber compression type two cycle internal combustion engines
US4121551A (en) * 1976-07-28 1978-10-24 Outboard Marine Corporation Drain recycle system for two-cycle engine
US4599979A (en) * 1984-08-09 1986-07-15 Outboard Marine Corporation Upper crankshaft bearing lubrication system for two-cycle engine
US4590897A (en) * 1984-11-13 1986-05-27 Brunswick Corp. Idle fuel residual storage system
US4820213A (en) * 1987-10-05 1989-04-11 Outboard Marine Corporation Fuel residual handling system
US4890587A (en) * 1988-01-29 1990-01-02 Outboardmarine Corporation Fuel residual handling system
US4836152A (en) * 1988-02-19 1989-06-06 Brunswick Corporation Exhaust heated crankcase for 2-cycle marine engine
WO1989007711A1 (en) * 1988-02-19 1989-08-24 Brunswick Corporation Exhaust heated crankcase for 2-cycle marine engine
US4846136A (en) * 1988-02-26 1989-07-11 Brunswick Corporation Exhaust heated induction air for two-cycle engine

Also Published As

Publication number Publication date
DE2340934C3 (de) 1978-09-28
JPS4951430A (en, 2012) 1974-05-18
JPS5249536B2 (en, 2012) 1977-12-17
IT990229B (it) 1975-06-20
DE2340934B2 (de) 1978-01-26
AU475258B2 (en) 1976-08-19
GB1417227A (en) 1975-12-10
DE2340934A1 (de) 1974-02-28
BE803607A (fr) 1973-12-03
SE400808B (sv) 1978-04-10
AU5837473A (en) 1975-01-23
CA989314A (en) 1976-05-18

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