US3814390A - Carburetor with combined piston motor and diaphragm motor choke valve actuation - Google Patents

Carburetor with combined piston motor and diaphragm motor choke valve actuation Download PDF

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Publication number
US3814390A
US3814390A US00269124A US26912472A US3814390A US 3814390 A US3814390 A US 3814390A US 00269124 A US00269124 A US 00269124A US 26912472 A US26912472 A US 26912472A US 3814390 A US3814390 A US 3814390A
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United States
Prior art keywords
choke valve
motor
vacuum
engine
diaphragm
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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
US00269124A
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English (en)
Inventor
J Winkley
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Carter Automotive Co Inc
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ACF Industries Inc
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Publication date
Application filed by ACF Industries Inc filed Critical ACF Industries Inc
Priority to US00269124A priority Critical patent/US3814390A/en
Priority to CA168,636A priority patent/CA978041A/en
Priority to JP48075596A priority patent/JPS4951422A/ja
Application granted granted Critical
Publication of US3814390A publication Critical patent/US3814390A/en
Priority to JP1977069855U priority patent/JPS5325053Y2/ja
Assigned to CARTER AUTOMOTIVE CORPORATION, INC., 9666 OLIVE BOULEVARD, ST. LOUIS, MISSOURI 63132, A CORP. OF DE. reassignment CARTER AUTOMOTIVE CORPORATION, INC., 9666 OLIVE BOULEVARD, ST. LOUIS, MISSOURI 63132, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ACF INDUSTRIES, INCORPORATED
Assigned to CARTER AUTOMOTIVE COMPANY, INC. reassignment CARTER AUTOMOTIVE COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ACF INDUSTRIES, INCORPORATED
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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat

Definitions

  • a piston motor responsive to manifold vacuum opens the choke valve partially soon after the engine starts.
  • a diaphragm motor responds to engine vacuum more slowly than the first motor.
  • the diaphragm acts through a modulating spring to open the choke valve, which is connected to a thermostatic coil spring urging the choke valve closed at low ambient temperatures. At high ambient temperatures, actuation of the diaphragm causes wide opening of the choke valve, and at low ambient temperature causes less initial opening, followed by further opening of the choke valve as the engine warms up.
  • the automatic choke of a carburetor is required to provide an excess of fuel for the engine during cranking, and a leaner mixture of air and fuel after the engine starts. As the engine heats up, progressive further opening of the choke to provide further leaning of the airfuel mixture is desirable.
  • the choke is usually biased toward its closed position by a thermostatic spring coil, and it has been proposed to connect a vacuum motor acting against the thermostat coil to open the choke to meet the operating requirements. This is disclosed in U.S. Pat. No. 3,321,193, issued to Wenford E. Highley, and U.S. Pat. No.
  • a carburetor choke is connected to the usual thermostat spring coil which acts to close the choke at low temperatures.
  • a vacuum motor has a movable diaphragm, and a link extending from thediaphragm is urged to a retracted position by a modulator spring.
  • a lever connects the link to the shaft of the choke.
  • One side of the diaphragm is exposed to engine manifold suction through a delay device having a small orifice.
  • the choke shaft also is connected to a piston in a cylinder having a passageway opening into the mixture conduit of the carburetor. When the engine starts, the pressure in the cylinder drops and the piston moves down to open the choke slightly.
  • the pistonand cylinder motor provides a fail-safe feature, in the event the delay device malfunctions, or becomes blocked, or the diaphragm fails to open the choke sufficiently for the engine to operate.
  • the diaphragm and modulator spring provide an increased lean-out effect after an initial running period at warm ambients, or when the engine warms up, to permit reduced exhaust emissions.
  • FIG. 1 is a schematic view, partly in section, showing the choke valve closed.
  • FIG. 2 is a partial schematic view showing the choke valve operated to an open position by the piston motor.
  • FIG. 3 is a view similar to that of FIG. 1 with the diaphragm motor actuated.
  • FIG. 4 is another schematic view showing the position of the choke valve at high ambient temperatures or after the engine has warmed up, with the diaphragm motor actuated.
  • the invention relates to improved apparatus for controlling an automatic choke so as to obtain reliable engine starting with reduced exhaust emissions.
  • a given program of choke opening is required for low ambient temperatures, and a different program of choke opening is needed at higher ambient temperatures above about F. during engine starting and warm up.
  • the choke valve is opened in stages: first, a minimal opening by a piston motor immediately after engine starting, then delayed further opening of the choke by a spring modulated diaphragm motor, and progressive further opening of the choke valve during engine warm up, if the ambient temperature is low.
  • carburetor 10 has a body 12 enclosing a mixture chamber 14 provided with a throttle l6 and chokevalve 18.
  • the latter is mounted on shaft 20, which has lever arms 22 and 24.
  • Thermostatic coil spring 26 has one end 27 fixed and its other end 28 adapted to abut lever arm 24.
  • Choke valve 18 is of the unbalanced type, normally urged open by the air pressure on its top side as well as by gravity.
  • Air motor 30 includes cylinder 31 and piston 32 fixed to link 34, which is looped over the upper edge of lever arm 22. Passage 36 connects the bottom of cylinder 31 to mixture chamber 14 below throttle 16 in order to expose cylinder 31 to engine manifold vacuum.
  • Vacuum motor 40 mounted on bracket 41 includes a diaphragm 42 urged to the right in FIG. 1 by spring 44.
  • Motor 40 is connected by conduit 46 to engine vacuum through a delayer consisting of a plug 48 having a small orifice 50.
  • Casing 52 has a slidable hub 54 in which link 56 is slidably mounted.
  • the inner end of link 56 has a flange 58 and a modulator spring 60 tends to move link 56 inwardly of hub 54 into engagement with a button 62 at the center of diaphragm 42.
  • Link 56 includes a hollow member 64 in which rod 66 with flanged end 68 has a limited telescoping movement,
  • Link 56 thus provides a lost motion connection between lever arm 24 and motor 40 to permit choke valve 18 to be moved finally to a fully open position by the action of the air stream and gravity on the unbalanced choke valve.
  • the operation of the choke valve may be summarized as follows. It is assumed that choke valve 18 is closed, as shown in FIG. 1, and the engine is cranked for starting. As soon as the engine starts, a vacuum is created in mixture chamber 14 and communicated through passage 36 to cylinder 31. Piston 32 then moves downward from the position shown in FIG. 1 to the position shown in FIG. 2, and choke valve 18 is pulled open by rod 34, acting against the closing force imposed on lever arm 24 by thermostatic spring coil 26. Thus a slight opening of the choke valve. is obtained promptly to prevent a rich or loading" condition from developing when the engine begins to run. As manifold vacuum is applied to motor 40, delay device 48, 50 causes diaphragm 42 to move gradually during an interval which may be as long as 30 to 45 seconds.
  • thermostatic'spring 26 relaxes and is overriden by modulator spring 60, which moves link 56 and opens choke valve 18 further, as indicated in FIG. 4.
  • modulator spring 60 which moves link 56 and opens choke valve 18 further, as indicated in FIG. 4.
  • the lost motion connection between elements 64 and 66 of link 56 permits choke valve 18 to be moved to the fully open vertical position by the air stream.
  • Piston motor 30 also may serve as a fail-safe device in the event of failure of diaphragm motor 40, since it independently opens the choke valve sufficiently to allow the engine to run, and the choke valve is then able to open progressively as the engine warms up and causes the thermostatic coil spring to relax and release the choke valve.
  • Choke lever arm 22 is loose on shaft 21 and is provided with a tab 23.
  • tab 23 picks up lever arm 24 which is fast on shaft 20.
  • movement of lever arm 22 by way of tab 23 moves the lever arm 24 causing the partial initial opening of choke 18 as required by the invention.
  • Movement of choke 18 by piston 32 is limited by the fact that the piston can travel downwardly only until it intersects crosspassage 36 which applies vacuum to the piston 32.
  • the length of the piston 32 and the cylinder 31 can be adjusted to give the required amount of movement of piston 32 to satisfy the engine operating conditions. Alternatively, the length of link 34 can be adjusted to achieve the same results.
  • a carburetor device for an internal combustion engine having a body, a mixture conduit extending through said body, a movable throttle valve in said mixture conduit, a choke valve in said mixture conduit upstream of said throttle valve and mounted on a shaft for rotation from an open to a closed position, a vacuum motor, means forming a vacuum passage extending from said motor to said mixture conduit at a point below said-throttle valve for providing engine manifold vacuum to said motor, a mechanical connection be tween said vacuum motor and said choke valve to move said choke valve to a partially open position in response to engine vacuum, a temperature responsive spring connected to said choke valve for biasing it closed at temperatures below a predetermined value, said vacuum motor being capable of overriding said temperature responsive spring for partially opening said choke valve when the engine starts, a second vacuum motor having a movable member and being responsive to engine vacuum posterior to said throttle, delay means for retarding the response of said second vacuum motor engine vacuum, a link connected to the shaft of the choke valve, and a resilient connection between said movable mov
  • said movable member of the second vacuum motor includes a diaphragm and a spring urging the diaphragm to its inoperative position.
  • said delay means is a member having a restricted orifice in a conduit connecting the second vacuum 'motor to a source of engine vacuum.
  • a carburetor devicefor an internal combustion engine having a body, a mixture conduit extending through said body,-a movable throttle valve in said mixture conduit, an unbalanced choke valve in said mixture conduit upstream of said throttle valve, a vacuum piston motor, a passage extending from said motor to said mixture conduit for providing a source of engine manifold vacuum to said motor, a mechanical connection between said vacuum motor and said choke valve to move said choke valve to a partially open position in response to engine vacuum, a temperature responsive spring connected to said choke valve for biasing it closed at temperatures below a predetermined value, said vacuum motor being capable of overriding said temperature responsive spring for partially opening said choke valve when the engine starts, a diaphragm vacuum motor responsive to engine vacuum, delay means for retarding the rate at which said diaphragm motor responds to the enginevacuum, a link connecting the diaphragm of the motor to the shaft of the choke valve, and a resilient connection between the diaphragm and said link, said resilient connection being capable of overriding said temperature responsive

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
US00269124A 1972-07-05 1972-07-05 Carburetor with combined piston motor and diaphragm motor choke valve actuation Expired - Lifetime US3814390A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00269124A US3814390A (en) 1972-07-05 1972-07-05 Carburetor with combined piston motor and diaphragm motor choke valve actuation
CA168,636A CA978041A (en) 1972-07-05 1973-04-09 Carburetor with combined piston motor and diaphragm motor choke valve actuation
JP48075596A JPS4951422A (enrdf_load_stackoverflow) 1972-07-05 1973-07-03
JP1977069855U JPS5325053Y2 (enrdf_load_stackoverflow) 1972-07-05 1977-05-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00269124A US3814390A (en) 1972-07-05 1972-07-05 Carburetor with combined piston motor and diaphragm motor choke valve actuation

Publications (1)

Publication Number Publication Date
US3814390A true US3814390A (en) 1974-06-04

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ID=23025902

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US00269124A Expired - Lifetime US3814390A (en) 1972-07-05 1972-07-05 Carburetor with combined piston motor and diaphragm motor choke valve actuation

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US (1) US3814390A (enrdf_load_stackoverflow)
JP (2) JPS4951422A (enrdf_load_stackoverflow)
CA (1) CA978041A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965223A (en) * 1974-09-18 1976-06-22 Schmelzer Corporation Charge forming device
US4144292A (en) * 1977-10-11 1979-03-13 Colt Industries Operating Corp. Dual diaphragm choke assembly
US4189454A (en) * 1978-10-13 1980-02-19 Schmelzer Corporation Vacuum motor for carburetors
FR2437514A1 (fr) * 1978-09-29 1980-04-25 Schmelzer Corp Dispositif de commande a fluide sous pression

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52104627A (en) * 1976-02-27 1977-09-02 Hitachi Ltd Carburetter
JPS5315419U (enrdf_load_stackoverflow) * 1976-07-21 1978-02-08
JPS5454744U (enrdf_load_stackoverflow) * 1977-09-26 1979-04-16

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159692A (en) * 1962-04-02 1964-12-01 Holley Carburetor Co Choke mechanism
US3253781A (en) * 1964-03-31 1966-05-31 Gen Motors Corp Choke valve control
US3262683A (en) * 1963-08-02 1966-07-26 Chrysler Corp Automatic choke
US3272486A (en) * 1963-03-26 1966-09-13 Holley Carburetor Co Carburetor having an automatic choke
US3321194A (en) * 1964-04-10 1967-05-23 Acf Ind Inc Carburetor
US3321193A (en) * 1964-03-26 1967-05-23 Acf Ind Inc Carburetor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159692A (en) * 1962-04-02 1964-12-01 Holley Carburetor Co Choke mechanism
US3272486A (en) * 1963-03-26 1966-09-13 Holley Carburetor Co Carburetor having an automatic choke
US3262683A (en) * 1963-08-02 1966-07-26 Chrysler Corp Automatic choke
US3321193A (en) * 1964-03-26 1967-05-23 Acf Ind Inc Carburetor
US3253781A (en) * 1964-03-31 1966-05-31 Gen Motors Corp Choke valve control
US3321194A (en) * 1964-04-10 1967-05-23 Acf Ind Inc Carburetor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965223A (en) * 1974-09-18 1976-06-22 Schmelzer Corporation Charge forming device
US4144292A (en) * 1977-10-11 1979-03-13 Colt Industries Operating Corp. Dual diaphragm choke assembly
FR2437514A1 (fr) * 1978-09-29 1980-04-25 Schmelzer Corp Dispositif de commande a fluide sous pression
US4189454A (en) * 1978-10-13 1980-02-19 Schmelzer Corporation Vacuum motor for carburetors

Also Published As

Publication number Publication date
CA978041A (en) 1975-11-18
JPS4951422A (enrdf_load_stackoverflow) 1974-05-18
JPS52156825U (enrdf_load_stackoverflow) 1977-11-29
JPS5325053Y2 (enrdf_load_stackoverflow) 1978-06-27

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Date Code Title Description
AS Assignment

Owner name: CARTER AUTOMOTIVE CORPORATION, INC., 9666 OLIVE BO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ACF INDUSTRIES, INCORPORATED;REEL/FRAME:004491/0867

Effective date: 19851212

AS Assignment

Owner name: CARTER AUTOMOTIVE COMPANY, INC., 9666 OLIVE BOULEV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ACF INDUSTRIES, INCORPORATED;REEL/FRAME:004715/0162

Effective date: 19870410

Owner name: CARTER AUTOMOTIVE COMPANY, INC., MISSOURI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ACF INDUSTRIES, INCORPORATED;REEL/FRAME:004715/0162

Effective date: 19870410