US3847131A - Throttle operating mechanism for carburetor - Google Patents

Throttle operating mechanism for carburetor Download PDF

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Publication number
US3847131A
US3847131A US00367151A US36715173A US3847131A US 3847131 A US3847131 A US 3847131A US 00367151 A US00367151 A US 00367151A US 36715173 A US36715173 A US 36715173A US 3847131 A US3847131 A US 3847131A
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US
United States
Prior art keywords
throttle
valve
diaphragm
carburetor
actuating rod
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
US00367151A
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English (en)
Inventor
T Hisatomi
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.)
Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Application granted granted Critical
Publication of US3847131A publication Critical patent/US3847131A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F02M19/122—Damping elements
    • 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
    • F02M3/06—Increasing idling speed
    • F02M3/07—Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/19—Degassers

Definitions

  • F02 b 77/00 means and dashpot Cooperating with hrottle
  • a throttle operating mechanism having means for damping the movement of a carburetor throttle valve and means for preventing running or dieselling of the readily installed in existing engine carburetors.
  • FIGS. 1 and 2 are schematic views illustrating a throttlc operating mechanism according to the present invention, the mechanism being shown as incorporated in a conventional carburetor of an internal combustion engine;
  • FIGS. 3(A) and (B) are enlarged sectional views illustrating a structural part of the mechanism shown in FIGS. 1 and 2.
  • FIGS. 1 and 2 ofthe drawings there is shown a throttle operating mechanism implementing the present invention.
  • the throttle operating mechanism proposed by the present invention is used with a conventional carburetor of an internal combustion en- Y 52 extending through a solenoid coil 54 supported by prises a casting 10 in which an air-fuel mixture passage 12 is formed.
  • the air-fuel mixture passage 12 is adapted to communicate with an intake manifold (not shown) of the engine.
  • a throttle'valve 14 is rotatably mounted within the air-fuel mixture'passage 12 for controlling the amount of intake air and accordingly the air-fuel mixture to be fed to the engine cylinders.
  • the throttle valve 14 is fixedly connected to a throttle shaft 16 for rotational movement therewith;
  • the throttle operating-mechanism embodying the present invention is shown attached to the carburetor casting l0 and comprises a throttle actuating arm 18 which is rotatably mounted at one end on the throttle shaft 16.
  • the throttle actuating arm 18 has The throttle actuating arm 18 is provided at its other end with a throttle adjusting screw- 22, which is threaded in the arm 18 and held in any adjusted position by a retaining spring 24.
  • the throttle operating mechanism further comprises a dashpot, generally designated by reference numeral 26, which has a casing 28 secured to the carburetor casting 10 by some suitable means, though not shown.
  • Diaphragm means such as a flexible diaphragm 30 is disposed in the casing 28 and divides the same into first and second chambers 32 and 34.
  • the first chamber 32 communicates with.the atmosphere through an air vent 38 formed in the casing 28.
  • An actuating. rod 40' is connected to the diaphragm 30 by means of a pair of disc plates 42 .and 44 and extends from the first chamber 32 into the atmosphere through an adjustable guide member 46.
  • the actuating rod 40 extends in such a manner that an end 40a of the rod 40 faces an end 22d of the throttle adjusting screw 22.
  • the adjustable guide member 46 is threaded in the bottom part of the casing 28 and held in adjusted position by a nut 48.
  • theadjustable guide member 46 has an end portion extending into the first chamber 32 of the casing 28 and, therefore, the disc plate 42 of the dia-.
  • the dashpot 26 also includes a second biasing means such as a compressionspring 50,-v which is disposed in the second chamber 34 of thecasing 28 between the diaphragm 30 and a valve plunger the casing 28.
  • the force of second biasing means 50 is determined to be less than that of the first biasing.
  • the valve plunger 52 is formed at its one end with a tapered valve head 52a which is engageable with a tapered valve surface 56 formed in the casing 28.
  • the valve plunger 52 also has formed therein an axially extending air passage 52)) merging with a laterally extending air passage 520 which opens at the tapered surface of the valve head 52a.
  • Formed at the other end of the valve plunger 52 is an annular flange 52d which serves as a spring seat for the compression spring 50.
  • Indicated by reference numeral. 58 is a covering which is made of resilient material such as rubber.
  • the covering 58 has formed therein an air vent 58a and is tightly fitted on the casing 28 at an upper portion thereof.
  • covering 58 also has an opening 58b formed therein through which lead wires 60 extend from the solenoid coil 54.
  • the solenoid coil 54 is grounded through one of the lead wires 60 and is connected through another one of the lead wires 60 to an ignition switch 62, which in turn is connected to a source of electric power supply such as a battery 64.
  • Indicated by reference numeral 66 is an adjustable stop screw which is threaded in a laterally projecting flange 68 and held in any adjusted position by a retaining spring 70. As seen in FIG. 2, the adjustable stop screw 66 is adapted to be engageable at its terminal end with the opposing surface of the actuating lever 18 so that an excessive rotation of the same is prevented,
  • the disc plate 42 is formed with anaperture 42a which communicates through a variable opening 30a'formed in the flexible diaphragm 30 with an aperture 44a formed in the disc plate 44.
  • a check valve 72 is formed on the diaphr'agm 30.
  • the solenoid coil 54 is energized to cause the valve plunger 52 to be retracted thereby moving the diahragm 30 and accordingly the actuating rod 40 leftwardly as viewed in FIG. 1.
  • the valve head 52a of the valve plunger 52 is brought into engagement with the valve surface 56 formed on thccasi'ng 28.
  • the laterally extending air passage 52c formed in the valve head 52a is presenved from communicating with the air vent 580 formed in the covering 58.
  • the end a of the actuating rod 40 is brought into engagement-with the end of the throttle adjusting screw 22 thereby rotating the throttle actuating arm 18 counterclockwise-that is, in a direction to slightly open the throttle valve 14 against the action of the first biasing means 20.
  • the degree of opening of the throttle valve 14 is determined to have a proper value for effecting easy starting of the engine and for maintaining a desirable idling operation of the engine that is, the rightmost position in which the throttle.
  • the second chamber 34 is held in communication with the first chamber 32 through the apertures 42a and 44a and the variable opening 30a of the disc plates the first chamber 32 communicates with'the atmosphere through the air vent 38 formed in the casing 28.
  • the throttle actuating arm 18 is forced to rotate clockwise by the action of the first biasing means 20 thereby to quickly rotate the throttle valve 14 me direction to decrease opening degree.
  • the speed of rotations of the throttle actuating arm 18 and accordingly the throttle valve 14 is decreased or dampened to effect smooth deceleration of the engine.
  • the damping effect on the throttle valve movement due to the inherent construction ofthe present mechanism is obtained to provide delayed decrease in the throttle opening during deceleration of the engine and also the engine speed is maintained at a relatively higher level during idling operationof theengine by adjusting the position of the guide 46 and the throttle adjusting screw 22 whereby the quantity of toxic compounds such as hydrocarbons and carbon monoxide contained in the engine exhaust gases is significantly reduced. It is also understood that the mechanism embodying the present invention effect stabilized idling operation of the engine to reduce the above-mentioned toxic compounds in the engine exhaust gases.
  • the diaphragm 30 is held inits other extreme position
  • valve 14 is maintained in a position to have a predetermined opening degree for continuing high-speed idling operation of the engine. If, in this condition, the acceler'ator pedal is depressed, the actuating rod 40 is quickly moved leftwardly of the drawing by the action of the second biasing means 50 as already stated hereinabovev In this instance, the air in the first chamber 32 flows out into the atmosphere through the air vent 38 formed in the casing 28 and is partly delivered into the second chamber 34 through the apertures and opening of the discs and diaphragm disposed therebetween in a manner as shown in FIG. 3(B). Thus, the smooth leftward movement of the actuating rod 40 is obtained.
  • the solenoid coil 54 is de-energized so that the valve plunger 52 is moved rightwardly of the drawing as shown in FIG. 2 by the action of the second biasing means 50.
  • the valve head 52a of the valve plunger 52 is brought into disengagement with the valve surface 56 of the casing 28. Consequently, the air passages 52b and 52c of the valve plunger 52 is brought into communication with the atmosphere through the air vent 58a of the covering 58.
  • the second chamber 34 is in communication with the atmosphere and, therefore, the diaphragm 30 is quickly moved rightwardly of the drawing by the force of the first biasing means which is transferred to the throttle actuating rod 18 and to the actuating rod 40 connected to the diaphragm 30.
  • the diaphragm 30 is held in its other extreme position shown in FIG. 2.
  • the throttle valve 14 is quickly rotated to its closed position so that the engine ceases to operate in the shortest period of time after opening of the ignition switch 62 or the engine is prevented from running off.
  • a throttle operating mechanism for a carburetor of an internal combustion engine comprising a throttle actuating arm rotatable with a carburetor throttle valve, first biasingmeans connected to said throttle actuating arm for biasing thesame in a direction to close said carburetor throttle valve, a casing attached to a carburetor casting, a diaphragm disposed in said casing to define first and second chambers therein and having i said casing, said actuating rod being engageable with an mechanism for damping the movement of the carburetor throttle valve and a valve plunger having an air pas- -plunger to provide a predetermined throttle opening 4 whereas the engine quickly ceases to operate .without running off and accordingly the quantity of the toxic compounds in the engine exhaust gases is reduced.
  • a throttle operating mechanism for a carburetor ofan internal combustion engine comprising a throttle actuating arm rotatable with a carburetor throttle valve to vary throttle opening and biased in a direction to close said carburetor throttle valve, a diaphragm disposed in a casing to define first and second chambers therein and having a check valve providing communication therebetween, an electromagnetically controlled plunger means connected to-one side of said diaphragm and movable therewith, said plunger means having formed therein an air passage communicating with one .of said first and second chambers, and an actuating rod plunger means when the same is moved in one direction whereby movements of said actuating rod and accordingly said diaphragm are dampened whereas, when said plunger means is moved in another direction, said end portion of said throttle actuating arm, a valve plunger disposed in said second chamber of said casing and having formed therein an air passage providing communication between said second chamber'and the atmosphere, said valve plunger also having a valve head engageable with
  • valve plunger being moved against the force of said second biasing means in a direction to cause said valve head to close'said air passage thereby to prevent said second chamber from communicating with atmosphere whereby the atm'ospheric air in said first chamber is allowed into said second chamber through said check valve in said diaphragm for thereby allowing slow movement of said ac tuating rod connected to said diaphragm, and said valve plunger being moved in another direction to open said air passage to provide communication between said second chamber and the atmosphere whereby said threaded in an end portion of said throttle actuating arm, said throttle adjusting screw having an end engageable with an end of said actuating rod.

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  • 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)
US00367151A 1972-06-06 1973-06-05 Throttle operating mechanism for carburetor Expired - Lifetime US3847131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972067071U JPS515622Y2 (en, 2012) 1972-06-06 1972-06-06

Publications (1)

Publication Number Publication Date
US3847131A true US3847131A (en) 1974-11-12

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ID=13334247

Family Applications (1)

Application Number Title Priority Date Filing Date
US00367151A Expired - Lifetime US3847131A (en) 1972-06-06 1973-06-05 Throttle operating mechanism for carburetor

Country Status (4)

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US (1) US3847131A (en, 2012)
JP (1) JPS515622Y2 (en, 2012)
FR (1) FR2188061B1 (en, 2012)
GB (1) GB1429041A (en, 2012)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971356A (en) * 1975-09-09 1976-07-27 Acf Industries, Incorporated Solenoid-dashpot
US4067306A (en) * 1976-06-24 1978-01-10 Acf Industries, Incorporated Solenoid operated device to control curb idle position of throttle valve
US4073272A (en) * 1976-10-08 1978-02-14 Tom Mcguane Industries, Inc. Throttle control system
US4086900A (en) * 1976-07-19 1978-05-02 Colt Industries Operating Corporation Variable position throttle stop and dashpot apparatus
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US4463716A (en) * 1982-09-20 1984-08-07 Tom Mcguane Industries, Inc. Throttle positioning device
DE3829247A1 (de) * 1987-09-07 1989-03-16 Fuji Heavy Ind Ltd Drosselklappendaempfer fuer einen verbrennungsmotor
US20040112333A1 (en) * 2002-12-12 2004-06-17 Robert Mitchell Governor stabilizer
US8726882B2 (en) 2010-03-16 2014-05-20 Briggs & Stratton Corporation Engine speed control system
US8910616B2 (en) 2011-04-21 2014-12-16 Briggs & Stratton Corporation Carburetor system for outdoor power equipment
US8915231B2 (en) 2010-03-16 2014-12-23 Briggs & Stratton Corporation Engine speed control system
US9316175B2 (en) 2010-03-16 2016-04-19 Briggs & Stratton Corporation Variable venturi and zero droop vacuum assist

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171686A (en) 1975-06-26 1979-10-23 Societe Industrielle De Brevets Et D'etudes S.I.B.E. Carburation devices with idle adjustment
JPS5747396Y2 (en, 2012) * 1976-08-16 1982-10-18
DE3122120A1 (de) * 1981-06-04 1983-01-05 Pierburg Gmbh & Co Kg, 4040 Neuss Wegsteller

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692651A (en) * 1951-03-14 1954-10-26 Chrysler Corp Dashpot control for vehicle engine throttle valves
US3682148A (en) * 1971-03-04 1972-08-08 Ford Motor Co Carburetor throttle valve positioner
US3744471A (en) * 1971-11-29 1973-07-10 Ford Motor Co Carburetor emission control
US3744470A (en) * 1971-11-29 1973-07-10 Ford Motor Co Engine anti-diesel control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692651A (en) * 1951-03-14 1954-10-26 Chrysler Corp Dashpot control for vehicle engine throttle valves
US3682148A (en) * 1971-03-04 1972-08-08 Ford Motor Co Carburetor throttle valve positioner
US3744471A (en) * 1971-11-29 1973-07-10 Ford Motor Co Carburetor emission control
US3744470A (en) * 1971-11-29 1973-07-10 Ford Motor Co Engine anti-diesel control

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30844E (en) * 1972-11-27 1982-01-12 Honda Giken Kogyo Kabushiki Kaisha Run-on prevention device for internal combustion engines
US3971356A (en) * 1975-09-09 1976-07-27 Acf Industries, Incorporated Solenoid-dashpot
US4067306A (en) * 1976-06-24 1978-01-10 Acf Industries, Incorporated Solenoid operated device to control curb idle position of throttle valve
US4086900A (en) * 1976-07-19 1978-05-02 Colt Industries Operating Corporation Variable position throttle stop and dashpot apparatus
US4073272A (en) * 1976-10-08 1978-02-14 Tom Mcguane Industries, Inc. Throttle control system
US4463716A (en) * 1982-09-20 1984-08-07 Tom Mcguane Industries, Inc. Throttle positioning device
DE3829247A1 (de) * 1987-09-07 1989-03-16 Fuji Heavy Ind Ltd Drosselklappendaempfer fuer einen verbrennungsmotor
US20040112333A1 (en) * 2002-12-12 2004-06-17 Robert Mitchell Governor stabilizer
US6983736B2 (en) 2002-12-12 2006-01-10 Briggs & Stratton Corporation Governor stabilizer
US8726882B2 (en) 2010-03-16 2014-05-20 Briggs & Stratton Corporation Engine speed control system
US8915231B2 (en) 2010-03-16 2014-12-23 Briggs & Stratton Corporation Engine speed control system
US9316175B2 (en) 2010-03-16 2016-04-19 Briggs & Stratton Corporation Variable venturi and zero droop vacuum assist
US8910616B2 (en) 2011-04-21 2014-12-16 Briggs & Stratton Corporation Carburetor system for outdoor power equipment
US9598828B2 (en) 2011-04-21 2017-03-21 Briggs & Stratton Corporation Snowthrower including power boost system

Also Published As

Publication number Publication date
GB1429041A (en) 1976-03-24
JPS515622Y2 (en, 2012) 1976-02-17
JPS4923629U (en, 2012) 1974-02-28
FR2188061A1 (en, 2012) 1974-01-18
FR2188061B1 (en, 2012) 1977-09-16

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