US3511220A - Carburetor - Google Patents

Carburetor Download PDF

Info

Publication number
US3511220A
US3511220A US757383A US3511220DA US3511220A US 3511220 A US3511220 A US 3511220A US 757383 A US757383 A US 757383A US 3511220D A US3511220D A US 3511220DA US 3511220 A US3511220 A US 3511220A
Authority
US
United States
Prior art keywords
carburetor
shaft
choke
valve
throttle
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
US757383A
Other languages
English (en)
Inventor
Gerd Otterbach
Gunter Troch
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.)
ZF Sachs AG
Original Assignee
Fichtel and Sachs AG
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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Application granted granted Critical
Publication of US3511220A publication Critical patent/US3511220A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • 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
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/12—External control gear, e.g. having dash-pots
    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/02—Preventing flow of idling fuel

Definitions

  • a carburetor for a gasoline engine in which a single control knob, when turned in one direction, sequentially causes tickling of the float, opening of the choke, closing of the throttle to idling speed, grounding of the ignition, and shut-off of the fuel supply conduit.
  • the knob is mounted on a shaft carrying the choke plate, the grounding switch, and the shut-off valve. Abutments on the choke plate operate the throttle and the tickler rod.
  • This invention relates to carburetors for internal combustion engines and particularly to a manual operating system for operating the choke, throttle, and other movable elements of a carburetor during starting and shutdown of the associated engine.
  • a single control member mounted on a support for movement relative to the same is connected with the choke, the throttle, an ignition shorting switch, and the fuel shut-off valve of the carburetor in such a manner that the several carburetor elements and the switch are sequentially operated in response to movement of the control member.
  • the carburetor shell which defines the air intake conduit of the carburetor preferably carries the shut-off valve and serves as a support for the shaft of the control member.
  • the choke is first moved away from its operative or starting position in which it largely obstructs the air intake conduit.
  • the throttle In a subsequent position of the control member, the throttle is moved into the operative or idling position in which it largely obstructs the air intake conduit.
  • the choke may be mounted on the same shaft as the control member for angular displacement about the shaft axis which may be parallel to the axis of the air intake conduit.
  • FIG. 1 shows a carburetor of the invention in front elevation without its outer casing and control knob
  • FIG. 2 shows the carburetor of FIG. 1 in side elevation in the direction of the arrow A;
  • FIG. 3 illustrates the same carburetor in rear elevation
  • FIG. 4 is a fragmentary sectional view of the device in section on the line IVIV;
  • FIG. 5 is a sectional view taken on the line V-V in FIG. 1;
  • FIG. 6 shows the outer carburetor casing and the carburetor control knob in a view corresponding to that of FIG. 1.
  • FIGS. 1 to 4 there is seen 'as much of an otherwise conventional carburetor as is needed for an understanding of this invention.
  • a portion of the carburetor shell 10 encloses an air intake duct 12, and another portion forms a float chamber 14 in which a float 16 is pivotally mounted on a pin 18.
  • the float chamber 14 receives fuel from a nonillustrated tank through a fuel supply conduit 20 equipped with a shut-off valve 22 and a float-operated needle valve 24.
  • Y fuel supply conduit 20 equipped with a shut-off valve 22 and a float-operated needle valve 24.
  • a fuel line 26 communicates with the chamber 14 and terminates in an orifice in the air intake conduit 12.
  • a choke 28 largely obstructs the duct 12 in the view of FIG. 1 ahead of the fuel line orifice, and a throttle 30 similarly obstructs the duct '12 in the view of FIG. 3 downstream from the fuel line orifice.
  • the shell 12 is provided with apertures 32 for fasteners which normally attach the shell 10 to the inlet of the associated, non-illustrated engine cylinder.
  • the choke 28 mainly consists of a plate 34 mounted on a shaft 36 which is journaled in the shell 10.
  • the axis of the shaft 36 is spacedly parallel to the longitudinal axis of the duct 12.
  • the throttle 30 is mounted on a pin 38 which is also journaled in the shell 10 and is biased by a torsion spring 40 toward the angular position of the throttle 30 illustrated in FIG. 3.
  • a sheet metal arm 42 radially projects from the shaft 38 outside the duct 12 and has a forked free end 44, the only illustrated element of a throttle linkage connecting the shaft 38 to an automatic speed governor (not shown) as is conventional in some power tool applications and not directly relevant to this invention.
  • a bore in the portion of the shell 10 enclosing the float chamber 14 slidably receives a tickler rod 46 whose inner end is directed from above toward the float 16 in the chamber 14, and which is biased outward of the chamber by a helical compression spring 48. Outward movement of the tickler rod 46 beyond the position illustrated in FIG. 1 is prevented by non-illustrated stops.
  • the apparatus described so far functions in a conventional manner.
  • the valve 22 When the valve 22 is open, fuel flows through the conduit 20 into the chamber 14 until the rising float 16 closes the needle valve 24. Fuel is drawn from the chamber 14 into the duct 12 by the vacuum of the connected engine and is atomized in the duct.
  • the plate 34 of the choke 28 largely obstructs the flow of air into the throat of the duct 12 so that a fuel mixture rich in gasoline is fed to the engine through the opened throttle 30.
  • the tickler rod 46 may be depressed prior to starting to fill the chamber 14 beyond the level automatically maintained by the float 16 during normal operation, the float being held away from the needle valve 24 by the rod 46.
  • the choke 28 is opened and the throttle 30 is operated normally by the throttle linkage. It is biased toward the idling position seen in FIG. 3 by the spring 40. Ultimately, the engine is stopped by shutting the valve 22.
  • This invention is concerned mainly with a control mechanism which operates the afore-described and other elements of the carburetor and associated other engine elements in a particularly convenient and simple manner.
  • the actuating shaft 36 on which the choke plate 34 is mounted carries a U-shaped prong 52 on one of its axial ends outside the shell 10.
  • the prongs are somewhat resilient and can slida'bly engage conforming grooves of a control knob 54, as is shown in FIG. 4 only.
  • the knob coaxially turns with the shaft 36 and with the choke plate 34 mounted on the shaft.
  • An abutment 56 projects from the plate 34 in such a manner that it can engage and depress the tickler rod 46 "when the shaft 36 is turned counter-clockwise from the position seen in FIG. 1.
  • the plate 34 of the choke 28 has an edge 58 which abuts against a leaf spring 60' in the position shown in full lines in FIG. 5.
  • the spring 60 is attached to the shell 10 at 62.
  • the spring 60 is bent resiliently in the direction of the arrow 64 into abutting engagement with a wire link 66 attached to the arm 42, thereby moving the link 66 in the direction of the arrow 68, and returning the throttle 30 to the idling position of FIG. 3 regardless of the condition of the throttle linkage portion not seen in the drawing.
  • the fuel shut-off valve 22 includes a stationary valve housing 70 fixedly attached to the shell 10, a valve disc 72 mounted on the shaft 36, and a gasket 74 interposed between the housing 70 and the disc 72.
  • Two longitudinal portions of the fuel supply conduit 20 have respective orifices in the flat wall of the housing 70 opposite the disc 72.
  • the face of the latter opposite the housing 70 has a groove 76 which has the shape of an open ring of circular curvature about the axis of the shaft 36.
  • the gasket 74 is perforated to permit the orifices of the conduit 20 in the housing 70 to be connected or separated by turning the disc 72 by means of the knob 54 and the shaft 36.
  • the axial end of the shaft 36 remote from the knob 54 carries the movable contact 78 of an ignition shorting switch 82 whose fixed contact 80 is mounted on the shell and grounded to the shell.
  • the movable contact 78 is electrically insulated from the shaft 36 and connected to the hot wire of the ignition system in a manner not shown in detail in the drawing, but known in itself.
  • FIG. 6 shows the outer casing 88 of the partly illustrated engine and carburetor.
  • the main portion of the control knob 54 is located outside the casing 88, and only the narrow neck of the knob reaches through an opening in the casing for engagement by the prong 52.
  • An arrow 84 molded into the knob cooperates with a scale 86 on the casing 88 to indicate the angular position of the knob 54 and of its shaft 36, and the resulting condition of the carburetor.
  • the arrow 84 points at the index mark start of the scale 86 in which the choke 28 is in the position of FIG. 1.
  • the knob Prior to starting the engine, the knob is briefly turned counterclockwise into the position tickle to flood the chamber 14 with fuel if so desired. It is then returned to the start position, the non-illustrated ignition circuit is closed, and the engine is started by means of a pull rope if so equipped.
  • the closed choke 28 causes an enriched fuel mixture to be supplied to the engine.
  • knob 54 When the latter has warmed up sufliciently, the knob 54 is turned to position run, thereby removing the choke plate 34 from the air intake duct 12, and the engine runs thereafter at the speed set by its governor.
  • control knob 54 When the engine is to be shut down, the control knob 54 is turned further in a clockwise direction to idle, thereby closing the throttle, as seen in FIG. 5, and slowing the engine. When the knob 54 is ultimately turned to position stop, the ignition circuit is grounded by the switch 82, and the fuel supply conduit 20 is interrupted at the valve 22. The engine stops.
  • the knob Prior to the next operating cycle, the knob is returned to the position start, thereby opening the switch 82 and the valve 22. All functions of the carburetor which require intervention of the operator are thus set by the single knob 54 by an angular movement of the same in one direction for each operating cycle.
  • a carburetor for an internal combustion engine having an air intake conduit (12), a float chamber (14), a float (16) in said chamber (14), a fuel supply conduit (20) communicating with said chamber (14), a fuel line (26) connecting said chamber (14) with a portion of said air intake conduit (12), a float valve (24) in said fuel supply conduit (20) adapted to be operated by said float (16), a choke (28) and a throttle (30') oppositely spaced in said air intake conduit (12) fromsaid portion of the same, a grounding switch (82) for grounding the ignition circuit of said engine, a shut-off valve (22) in said fuel supply conduit (20), and operating means for operating said choke (28), said throttle (30), said switch (82), and said shut-off valve (22), the improvement in the operating means which comprises:
  • said control member (54) during said movement thereof sequentially passing through a plurality of positions when moving in one direction; said choke (28) being moved away from an operative position thereof in which the choke largely obstructs said air intake conduit (12) when said control member (54) moves through one of said positions thereof, said throttle (30) being moved into an operative position thereof in which the throttle largely obstructs said air intake conduit (12) when said control member (54) moves through another of said positions thereof, later than said one position during movement in said one direction; said switch (82) being closed and said shut-off valve (22) being closed when said control member (54) moves beyond said other position.
  • said support including a shell (1) defining said air intake conduit (12) therein, said motion transmitting means including a shaft (36) mounted on said shell (10') for angular displacement about the axis thereof, said control member (54) being mounted on said shaft (36) for angular displacement therewith, said displacement constituting said movement of said control member (54).
  • said air intake conduit (12) having an axis parallel to the axis of said shaft (36), said choke including a plate member (34) moving into and out of said air intake conduit (12) during said angular displacement of said shaft (36).
  • tickler means (46) mounted on said shell for moving said float (16) in a direction to open said float valve (24), said motion transmitting means including abutment means (56) mounted on said shaft (36) and enga-geable with said tickler means (46) for operating the same.
  • said motion transmitting means including cooperating abutments (58,
  • shut-off valve (22) including a valve chamber and a valve member (72) mounted on said shaft (36) and rotatable relative to said valve chamber (70) between a valveopening and a valve-closing position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
US757383A 1967-09-09 1968-09-04 Carburetor Expired - Lifetime US3511220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1576551 1967-09-09

Publications (1)

Publication Number Publication Date
US3511220A true US3511220A (en) 1970-05-12

Family

ID=5678869

Family Applications (1)

Application Number Title Priority Date Filing Date
US757383A Expired - Lifetime US3511220A (en) 1967-09-09 1968-09-04 Carburetor

Country Status (5)

Country Link
US (1) US3511220A (de)
AT (1) AT289470B (de)
CH (1) CH482113A (de)
DE (1) DE1576551B1 (de)
GB (1) GB1199117A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080302325A1 (en) * 2007-06-07 2008-12-11 Camas Reed Control device for engine of power equipment apparatus
US20140109867A1 (en) * 2012-10-19 2014-04-24 Techtronic Outdoor Products Technology Limited Multi-function choke switch
US20150233311A1 (en) * 2014-02-20 2015-08-20 Generac Power Systems, Inc. Single point engine control interface

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116395C2 (de) * 1991-05-18 2000-03-23 Stihl Maschf Andreas Betriebsartensteller für einen Verbrennungsmotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1770264A (en) * 1930-07-08 Harvey huber eslinger
GB956890A (en) * 1962-02-26 1964-04-29 Sibe Improvements in carburettors comprising and auxiliary starting device
US3338565A (en) * 1964-04-25 1967-08-29 Fichtel & Sachs Ag Carburetor
US3373725A (en) * 1965-09-03 1968-03-19 Michael A. Arpaia Fuel supply system, carburetor and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE865837C (de) * 1950-08-04 1953-02-05 Daimler Benz Ag Regel- und Bedienungsvorrichtung fuer Einspritzbrennkraftmaschinen
DE1202568B (de) * 1959-10-10 1965-10-07 Daimler Benz Ag Anlassvorrichtung fuer eine mit einer Glueh-einrichtung versehene Diesel-Brennkraftmaschine zum Antrieb von Kraftfahrzeugen
US3103544A (en) * 1961-06-19 1963-09-10 Acf Ind Inc Carburetor
US3323504A (en) * 1964-12-21 1967-06-06 Tecumseh Products Co Internal combustion engine speed governor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1770264A (en) * 1930-07-08 Harvey huber eslinger
GB956890A (en) * 1962-02-26 1964-04-29 Sibe Improvements in carburettors comprising and auxiliary starting device
US3338565A (en) * 1964-04-25 1967-08-29 Fichtel & Sachs Ag Carburetor
US3373725A (en) * 1965-09-03 1968-03-19 Michael A. Arpaia Fuel supply system, carburetor and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080302325A1 (en) * 2007-06-07 2008-12-11 Camas Reed Control device for engine of power equipment apparatus
US7681544B2 (en) * 2007-06-07 2010-03-23 Honda Motor Company, Ltd. Control device for engine of power equipment apparatus
US20140109867A1 (en) * 2012-10-19 2014-04-24 Techtronic Outdoor Products Technology Limited Multi-function choke switch
US20150233311A1 (en) * 2014-02-20 2015-08-20 Generac Power Systems, Inc. Single point engine control interface
US9476370B2 (en) * 2014-02-20 2016-10-25 Generac Power Systems, Inc. Single point engine control interface
US20170016406A1 (en) * 2014-02-20 2017-01-19 Generac Power Systems, Inc. Portable Engine Powered Device
US9771882B2 (en) * 2014-02-20 2017-09-26 Generac Power Systems, Inc. Method for forming a control for operation of a portable engine powered device

Also Published As

Publication number Publication date
DE1576551B1 (de) 1971-11-18
CH482113A (de) 1969-11-30
AT289470B (de) 1971-04-26
GB1199117A (en) 1970-07-15

Similar Documents

Publication Publication Date Title
US2982275A (en) Carburetor control
US2124778A (en) Carburetor
GB1458518A (en) Carburettor assemblies for precombustion chamber internal combustion engines
US3158144A (en) Walker
US2979047A (en) Automatic choke for small carburetors
US2523798A (en) Charge forming device
US2583406A (en) Carburetor
US2793634A (en) Automatic starting device
US2238333A (en) Carburetor
US2402208A (en) Deicing valve
US2393440A (en) Engine control mechanism
US3511220A (en) Carburetor
US2533551A (en) Engine starting device
US2694559A (en) Automatic choke
US2402361A (en) Carburetor
US2166899A (en) Carburetor structure
US2140776A (en) Carburetor
GB412957A (en) Carburettors for internal combustion engines
US2597606A (en) Engine starting device
US2518658A (en) Engine starting device
US2163904A (en) Carburetor
US2810559A (en) Carburetor
US2215614A (en) Carburetor
US2192703A (en) Carburetor valve
US2746439A (en) Carburetor