US3886917A - Carburetor with automatic choke - Google Patents

Carburetor with automatic choke Download PDF

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Publication number
US3886917A
US3886917A US367220A US36722073A US3886917A US 3886917 A US3886917 A US 3886917A US 367220 A US367220 A US 367220A US 36722073 A US36722073 A US 36722073A US 3886917 A US3886917 A US 3886917A
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US
United States
Prior art keywords
choke
throttle
valve
spring
lever
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
US367220A
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English (en)
Inventor
Masahiko Nakada
Hirobumi Matsumoto
Nobuyuki Kobayashi
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.)
Toyota Motor Corp
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Toyota Motor Corp
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Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
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Publication of US3886917A publication Critical patent/US3886917A/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
    • 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

  • FIG. 2 UNITED STATES PATENTS 1,456,502 5/1933 Hartwell 261/52 1 Claim, 6 Drawing Figures PATENTEUJUNIS ms SHEET FIG. 2
  • FIG. 1 A first figure.
  • This invention relates to an automatic, choke of hot air type for automotive vehicles in which a thermostatic coil operates in response to air heated by the exhaust gas to control the choke valve, and more specifically the invention relates to a novel and useful carburetor equipped with such an automatic choking mechanism.
  • the present invention has for its object the provision of a carburetor equipped with an automatic choke free of the foregoing disadvantage, which is designed so that when the throttle is partly open the force with which the choke valve is closed will be intensified so that an increased choking effect is achieved during idling or low-speed light-load operation.
  • the present invention may be described as a carburetor assembly which is equipped with an automatic choke and which includes a choke valve controlled by thermostatic means responsive to the exhaust gas temperatures of the vehicle upon which the carburetor is mounted, said exhaust gas temperatures being utilized for controlling operation of the choke valve. More particularly, the present invention comprises the improvement wherein a control system is incorporated into the carburetor assembly whereby the choke valve may be controlled in response to the position of the throttle valve as well as by the thermostatic control means.
  • a link mechanism operating in conjunction with said thermostatic means operates to render said choke valve responsive to the po-' sition of the throttle valve.
  • the link mechanism includes spring means operatively interconnecting the throttle valve and the choke valve to render the position of the choke valve dependant upon the position of the throttle valve.
  • the spring means are positioned to effect a smaller choke opening with smaller throttle openings through variation in the tension of the spring means thereby enabling variations in the position of the throttle valve to influence the position of the choke valve.
  • FIG. 1 is a front view of a carburetor which an automatic choke embodying the present invention
  • FIG. 2 is a view similar to FIG. 1, showing the carburetor during a different phase of its operation;
  • FIG. 3 is a characteristic curve of the operation of the embodiment shown in FIG. 1;
  • FIG. 4 is a side view of another embodiment of the invention.
  • FIG. 5 is a front view of the embodiment of FIG. 4.
  • FIG. 6 is a characteristic curve of the operation of the embodiment shown in FIG. 4.
  • FIG. I there is shown a carburetor body 1, a choke valve 2, a choke shaft 3, a throttle valve 4, and a throttle shaft 5.
  • Levers 6, 7 and 8 are formed as a unitary member secured to the choke shaft 3.
  • the lever 6 is connected to the outer end of a spiraled bimetallic spring or theremostatic coil ,9, the inner end of which is fixed to a theremostat housing 10.
  • the lever 8 is connected to a connecting rod 11, the other end of which is connected to a vacuum piston (not shown) in a choke cylinder 12.
  • a lever pin 13 is fixedly anchored in the thermostat housing 10, and a spring lever 14 is pivotally supported by the pin 13 for smooth turning motion.
  • One end of the spring lever is connected to the lever 7 by a spring 15.
  • the throttle shaft 5 fixedly supports a throttle lever 16, which in turn is linked to a push rod 17 through a connecting rod 18.
  • a guide 19 is provided for the push rod, and a stopper 20 for the spring lever 14.
  • the carburetor equipped with the automatic choke according to the present invention operates in the following manner.
  • the choke Before the engine warms up, the choke is kept opened in the position where three forces are in equilibrium. These forces are (l) the force with which the thermostatic coil 9 tends to close the choke valve 2, (2) the force with which the connecting rod 11 tends to open the choke valve 2 via the lever 8 in response to the manifold vacuum applied on the underside of the vacuum piston, and (3) the force with which the spring 15 tends to close the choke valve 2.
  • a spring whose tension varies with the opening of the throttle is installed in a conventional carburetor equipped with an automatic choke, whereby the choke opening is limited and a good choking effect is attained while the throttle opening is small.
  • This enables the engine to be supplied with a mixture of an adequate air-fuel ratio during the initial stage of idling just after a cold start or during idling operation or low-speed light-load operation before warm-up. In this way smooth engine operation is ensured.
  • the opening of the throttle is large enough to require only a small choking effect.
  • the choke opening can be increased to lessen the choking effect and feed a leaner mixture to the engine thereby reducing the noxious contents of the exhaust emissions.
  • FIGS. 4 and 5 wherein like parts as used in FIGS. 1 and 2 are designated by like numerals.
  • a spring stop 21 is fixed to the choke shaft 3, and a choke arm 22 having a cylindrical part 22a is revolvably sleeved over the choke shaft 3.
  • One end 15'a of a coil spring 15' is hooked on the stop 21, and the other end 15'b is hooked on a spring stop 22b of the choke arm 22.
  • the spring 15' is of such characteristic that it will not apply any force on the spring stop 21 and choke arm 22.
  • a spring stop 23 is fixed onto the throttle shaft 5, and a throttle lever 16' having an arcuate slot 16a is revolvably mounted on the throttle shaft 5.
  • One end 24a of a coil spring 24 stronger than the spring 15 is hooked on the spring stop 23, and the other end 2412 of the spring is hooked on a spring-stop recess l6'b of the throttle lever 16'.
  • the throttle lever 16' and choke arm 22 are connected via a link 18. The lower end of the link 18' is engaged with the arcuate slot 16a of the throttle lever 16'.
  • a stopper 25 is provided for the throttle lever 16'.
  • throttle valve 4 Before the engine starts, the opening of throttle valve 4 is small as shown in FIG. 5. The choke valve 2 is almost closed, and the choke arm 22, throttle lever 16', and link 18' are in the positions shown, the throttle valve 4 exerting no force at all on the choke valve 2.
  • a choke opening conforming to the characteristic of a conventional carburetor with an automatic choke is attained when the throttle opening is relatively small and that a larger choke opening than with the conventional carburetor is obtained when the throttle opening is relatively large.
  • the second embodiment of the invention just described exhibits the characteristic graphically represented in FIG. 3.
  • a carburetor assembly having a throttle valve and equipped with an automatic choke including a choke valve, and thermostatic means responsive to exhaust gas temperature for controlling operation of said choke valve, the improvement including means for rendering operation of said choke valve dependent upon the position of said throttle valve, said improvement comprising, in combination,
  • a throttle valve shaft connected with said throttle valve to rotate concurrently with displacement thereof
  • a choke valve coil spring concentrically located about said choke valve shaft and having a pair of ends, with one of said ends connected to impart a spring force to said choke valve shaft and with the other of said ends being connected to said choke arm, and
  • a throttle valve coil spring concentrically located about said throttle valve shaft and having a pair of ends, one of said ends being connected with said throttle valve shaft and the other of said ends being connected with said throttle lever.
  • said slot in said throttle lever being configured to impart a force from said throttle lever to said linkage arm only after said throttle lever has reached a predetermined position by displacement of said throttle valve beyond a predetermined location.

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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)
US367220A 1972-07-13 1973-06-05 Carburetor with automatic choke Expired - Lifetime US3886917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47069620A JPS4928716A (enExample) 1972-07-13 1972-07-13

Publications (1)

Publication Number Publication Date
US3886917A true US3886917A (en) 1975-06-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US367220A Expired - Lifetime US3886917A (en) 1972-07-13 1973-06-05 Carburetor with automatic choke

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US (1) US3886917A (enExample)
JP (1) JPS4928716A (enExample)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192834A (en) * 1978-06-12 1980-03-11 Acf Industries, Incorporated Carburetor
FR2461109A1 (fr) * 1979-07-12 1981-01-30 Pierburg Gmbh & Co Kg Carburateur avec dispositif de depart a froid
WO1981000593A1 (en) * 1979-08-29 1981-03-05 Acf Ind Inc Staged single carburetor
US4524742A (en) * 1982-12-20 1985-06-25 Weber S.P.A. Carburetor having electronically controlled elements for maintaining engine idling speed at a constant level and for controlling choke-valve position during a warm-up phase
EP0348706A3 (en) * 1988-06-29 1990-05-30 Mitsubishi Jukogyo Kabushiki Kaisha Control apparatus for an engine
US4983330A (en) * 1988-12-21 1991-01-08 Andreas Stihl Membrane carburetor having a coupling arrangement for coupling the choke and throttle flaps to each other
US5069180A (en) * 1990-10-19 1991-12-03 Onan Corporation Automatic choke apparatus and method
US6641118B2 (en) * 2001-09-14 2003-11-04 Andreas Stihl Ag & Co. Carburetor arrangement
US20050023290A1 (en) * 2003-07-28 2005-02-03 Welco Co., Ltd. Warewashing chemical dispenser
EP1571310A2 (en) 2004-03-03 2005-09-07 Honda Motor Co., Ltd. Device for controlling choke valve of carburetor
US20050194701A1 (en) * 2004-03-03 2005-09-08 Hiroshi Moriyama Device for controlling choke valve of carburetor
US20060043620A1 (en) * 2004-08-24 2006-03-02 David Roth Automatic choke for an engine
US20060043621A1 (en) * 2004-08-24 2006-03-02 David Roth Automatic choke for an engine
US20090146327A1 (en) * 2007-12-06 2009-06-11 Briggs & Stratton Corporation Carburetor and automatic choke assembly for an engine
US20090266334A1 (en) * 2008-04-25 2009-10-29 Honda Motor Co., Ltd. General purpose internal combustion engine
US11105238B2 (en) * 2019-12-06 2021-08-31 Hyundai Motor Company Device for screening NOX sensor

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162496A (ja) * 1974-11-27 1976-05-31 Inoue Japax Res Kensakusochi
JPS5183297A (ja) * 1975-01-17 1976-07-21 Inoue Japax Res Kenmasochi
JPS5244495A (en) * 1975-10-06 1977-04-07 Inoue Japax Res Inc Wire cutting system
JPS5244496A (en) * 1975-10-06 1977-04-07 Inoue Japax Res Inc Wire cutting system
JPS545287A (en) * 1977-06-14 1979-01-16 Inoue Japax Res Inc Wire-cut processing device
JPS5444320U (enExample) * 1977-08-29 1979-03-27
JPS557699U (enExample) * 1979-07-20 1980-01-18
JPS61111881A (ja) * 1984-11-07 1986-05-29 Toshiba Corp ワイヤソ−装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1456502A (en) * 1919-02-12 1923-05-29 Auto Betterment Corp Carburetor for internal-combustion engines
US1896390A (en) * 1930-06-11 1933-02-07 William C Carter Carburetor
US2094165A (en) * 1932-01-04 1937-09-28 Carter Carburetor Corp Internal combustion engine carburetor
US2134421A (en) * 1933-02-17 1938-10-25 Glen R Sisson Automatic choke
US2427030A (en) * 1932-08-29 1947-09-09 Gen Motors Corp Automatic choke valve
US2464328A (en) * 1944-10-11 1949-03-15 Mallory Marion Carburetor
US2977100A (en) * 1958-01-24 1961-03-28 Acf Ind Inc Throttle operated starter switch

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1456502A (en) * 1919-02-12 1923-05-29 Auto Betterment Corp Carburetor for internal-combustion engines
US1896390A (en) * 1930-06-11 1933-02-07 William C Carter Carburetor
US2094165A (en) * 1932-01-04 1937-09-28 Carter Carburetor Corp Internal combustion engine carburetor
US2427030A (en) * 1932-08-29 1947-09-09 Gen Motors Corp Automatic choke valve
US2134421A (en) * 1933-02-17 1938-10-25 Glen R Sisson Automatic choke
US2464328A (en) * 1944-10-11 1949-03-15 Mallory Marion Carburetor
US2977100A (en) * 1958-01-24 1961-03-28 Acf Ind Inc Throttle operated starter switch

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192834A (en) * 1978-06-12 1980-03-11 Acf Industries, Incorporated Carburetor
FR2461109A1 (fr) * 1979-07-12 1981-01-30 Pierburg Gmbh & Co Kg Carburateur avec dispositif de depart a froid
WO1981000593A1 (en) * 1979-08-29 1981-03-05 Acf Ind Inc Staged single carburetor
US4524742A (en) * 1982-12-20 1985-06-25 Weber S.P.A. Carburetor having electronically controlled elements for maintaining engine idling speed at a constant level and for controlling choke-valve position during a warm-up phase
EP0348706A3 (en) * 1988-06-29 1990-05-30 Mitsubishi Jukogyo Kabushiki Kaisha Control apparatus for an engine
US4961409A (en) * 1988-06-29 1990-10-09 Mitsubishi Jukogyo Kabushiki Kaisha Control apparatus for an engine
US4983330A (en) * 1988-12-21 1991-01-08 Andreas Stihl Membrane carburetor having a coupling arrangement for coupling the choke and throttle flaps to each other
US5069180A (en) * 1990-10-19 1991-12-03 Onan Corporation Automatic choke apparatus and method
US6641118B2 (en) * 2001-09-14 2003-11-04 Andreas Stihl Ag & Co. Carburetor arrangement
US20050023290A1 (en) * 2003-07-28 2005-02-03 Welco Co., Ltd. Warewashing chemical dispenser
US20050194700A1 (en) * 2004-03-03 2005-09-08 Hiroshi Moriyama Device for controlling choke valve of carburetor
US7118097B2 (en) * 2004-03-03 2006-10-10 Honda Motor Co., Ltd. Device for controlling choke valve of carburetor
EP1571310A2 (en) 2004-03-03 2005-09-07 Honda Motor Co., Ltd. Device for controlling choke valve of carburetor
EP1571310A3 (en) * 2004-03-03 2008-11-19 Honda Motor Co., Ltd. Device for controlling choke valve of carburetor
US20050194701A1 (en) * 2004-03-03 2005-09-08 Hiroshi Moriyama Device for controlling choke valve of carburetor
US7097163B2 (en) * 2004-03-03 2006-08-29 Honda Motor Co., Ltd. Device for controlling choke valve of carburetor
US20060043621A1 (en) * 2004-08-24 2006-03-02 David Roth Automatic choke for an engine
US7144000B2 (en) 2004-08-24 2006-12-05 Briggs & Stratton Corporation Automatic choke for an engine
CN100387820C (zh) * 2004-08-24 2008-05-14 布里格斯斯特拉顿公司 用于发动机的自动阻风门
AU2005203527B2 (en) * 2004-08-24 2008-05-15 Briggs & Stratton Corporation Automatic choke for an engine
US20060043620A1 (en) * 2004-08-24 2006-03-02 David Roth Automatic choke for an engine
US20090146327A1 (en) * 2007-12-06 2009-06-11 Briggs & Stratton Corporation Carburetor and automatic choke assembly for an engine
US8240639B2 (en) 2007-12-06 2012-08-14 Briggs & Stratton Corporation Carburetor and automatic choke assembly for an engine
US20090266334A1 (en) * 2008-04-25 2009-10-29 Honda Motor Co., Ltd. General purpose internal combustion engine
US7854216B2 (en) * 2008-04-25 2010-12-21 Honda Motor Co., Ltd. General purpose internal combustion engine
US11105238B2 (en) * 2019-12-06 2021-08-31 Hyundai Motor Company Device for screening NOX sensor

Also Published As

Publication number Publication date
JPS4928716A (enExample) 1974-03-14

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