US3907945A - Carburetor control mechanism - Google Patents

Carburetor control mechanism Download PDF

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Publication number
US3907945A
US3907945A US487736A US48773674A US3907945A US 3907945 A US3907945 A US 3907945A US 487736 A US487736 A US 487736A US 48773674 A US48773674 A US 48773674A US 3907945 A US3907945 A US 3907945A
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US
United States
Prior art keywords
choke
valve
choke valve
control mechanism
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
US487736A
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English (en)
Inventor
Nobuyuki Kobayashi
Mitsunori Sasano
Masahiko Nakada
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
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 Toyota Motor Corp filed Critical Toyota Motor Corp
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Publication of US3907945A publication Critical patent/US3907945A/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
    • 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
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures
    • Y10T137/87981—Common actuator

Definitions

  • the present invention relates generally to a control mechanism for a carburetor used in vehicles such as automobiles, and more particularly to a choke control device whereby a choke valve is linked with a throttle valve of the carburetor for interdependent movement therebetween.
  • the mechanism of the present invention is particularly suited for use with manual choking de' vices.
  • the present invention aims at providing a manually operated choke device which is applicable in an engine exhibiting good warm-up performance, and in which the choke valve may be linked with the throttle valve so that it may be operated in an interrelated manner.
  • a choke device which can greatly reduce the amounts of unburned, detrimental components contained in exhaust gases during the time of cold engine idling.
  • the present invention may be described as a control mechanism for a carburetor including a choke valve and a throttle valve each operable to be moved between a closed position and an open position, said control mechanism comprising linkage means interconnecting said throttle valve and said choke valve for interdependent movement thereof, said linkage means being configured to cause the position of the throttle valve to be moved at a relatively lower rate when the choke valve is moved in the region near its closed position, and at a relatively higher rate when the choke valve is moved in the region near its open position.
  • the choke and throttle valves are interconnected so that as the choke valve is moved from its open position to its closed position, its initial effect upon the throttle valve is to move it toward its open position at a higher rate with the'rate of movement of the throttle valve toward the open position decreasing as the choke valve is brought to its closed position.
  • FIG. 1 is a front view schematically showing an embodiment of a choke mechanism constructed in accordance with the presentinvention
  • FIG. 2 is a diagramfillustpating the principles of operation of the structure, of the't kuigention.
  • FIG. 3 is a graph'showing the relationship between the throttle opening and the choke opening in a carburetor constructed in accordance with the invention.
  • FIG. 1 of the drawing there is shown a carburetor 1 having a choke valve 2 arranged on the upstream side thereof.
  • the choke valve 2 may be turned from its open position 2a, shown in brokenline form, to its closed position 2b, shown in dot-dashline form.
  • a throttle valve 3 is arranged on the downstream side of the carburetor 1, with the closed position 3a of the throttle valve 3 being shown in broken-line form.
  • the throttle valve 3 may be turned from its closed position 3a toward an open position 3c by movement thereof in the direction of an arrow 3b.
  • the choke valve 2 is connected for rotationwith a valve shaft 4 which defines a fixed pivot axis for the choke valve 2.
  • a lever 6 fixedly connected to the valve shaft 4 has attached thereto a choke wire 5 which may be pulled to rotate the lever 6 and the choke valve 2 in the direction of the arrow 2c thereby moving choke I valve 2 toward its closed position.
  • the throttle valve 3 is arranged to rotate with a valve shaft 7 which is fixedly connected to an arm 8.
  • the arm 8 is cooperatively associated with a lever 9 pivotally mounted on the shaft 7 through an intermediary adjustment screw 10 which is used for adjusting the opening of the valve at the time of engine idling wlserver the engine is in a cooled condition.
  • a connecting rod 13 is provided between the lever 6 and the lever 9 with one end of the connecting rod 13 being attached in an aperture 11 of the lever 6 to be freely rotatable therein.
  • the opposite end of the connecting rod 13 is similarly attached in an aperture 12 of the lever 9 and is likewise rotatable relative thereto.
  • the throttle valve 3 may be operated to be either interdependently linked with the choke valve 2 or to be movable independently thereof.
  • the closing movement of the choke valve 2 in the direction of the arrow 2c causes the opening movement of the throttle valve 3 in the direction of the arrow 3b, as described above.
  • the opening movement of the throttle valve 3 upon actuation of an accelerator pedal against the force of a return spring does not cause the closing movement of the choke valve 2, because the arm 8 fixed on the shaft 7 is turned away from the lever 9.
  • the points B and B represent positions of the aperture 11 at which a first joint between the lever 6 and the connecting rod 13 is established.
  • the positions C and C represent the positions of the aperture 12 at which a second joint is established between the connecting rod 13 and the lever 9.
  • the aperture 1 l occupies position B.
  • aperture 11 When the choke is fully closed, aperture 11 will be in position B. It will be seen that the aperture 11 may therefore lie on either side of a pair of lines labeled AC and AC during operation of the device.
  • the line AC extends between a position A, which represents the fixed pivot axis of the choke valve 2 defined by the valve shaft 4, and the point C which represents the position occupied by the aperture 12 when the throttle valve is arranged to define an opening corresponding to the hot engine idling condition.
  • the line AC connects the position A of the fixed pivot with a position C which is occupied by the aperture 12 when the throttle valve is at an opening corresponding to cold engine idling.
  • pivotal movement of the lever 9 will be great so that throttle valve 3 will be moved toward the open condition at a high rate.
  • the pivotal movement of the lever 9 becomes small so that the throttle valve 3 is turned at a low rate.
  • throttle valve opening is varied in a manner represented by the solid line of the graph of FIG. 3.
  • the throttle valve 3 will occupy the position 30 shown in dot-dash form in FIG. 1. In this position it is slightly opened to suit operation of a cold engine idling at a low temperature.
  • throttle valve opening will be in accordance with the solid line appearing in the graph of FIG. 3.
  • the dotted line shown in FIG. 3 depicts the relationship which exists when conventional carburetor mechanisms are used and it will be seen therefrom that the throttle valve opening changes in a proportional relationship relative to choke valve opening.
  • the choke valve will be almost closed, for example as indicated at the point 0 when the throttle valve is at an opening suited for cold engine idling at normal temperature.
  • the choke valve will be in a substantially opened condition, as indicated by the point 0 shown in FIG. 3, when the throt tle valve is at the same position as would produce an opening 9, in a conventional carburetor.
  • a carburetor embodying the control mechanism of the present invention and functioning as indicated above will provide advantageous features in an engine exhibiting good warmup performance and will greatly reduce the amounts of detrimental components contained in the exhaust gases.
  • a control mechanism for a carburetor including a choke valve and a throttle valve each operable to be moved between a closed position and an open position, said control mechanism comprising linkage means connecting said throttle valve with said choke valve to render said throttle valve movable toward its open position in dependence upon movement of said choke valve only when said choke valve moves toward its closed position, said linkage means including means for causing said throttle valve to be moved toward its open position at a relatively lower rate when said choke valve is moved toward its closed position within a region near its closed position and means for causing said throttle valve to be moved toward its open position at a relatively higher rate when said choke valve is moved toward its closed position within a region near its open position.
  • a control mechanism according to claim 1 wherein as said choke valve moves through a predetermined portion of its movement from its open position to its closed position, said linkage mechanism causes said throttle valve to move in the direction of opening at a continuously decreasing rate of movement.
  • a control mechanism comprises first linkage means affixed with said choke valve to be movable therewith, second linkage means affixed with said throttle valve to be movable therewith, and abutment means located to enable said first and second linkage means to move towards and into abutment with each other when said choke valve moves toward its closed position and away from abutment with each other when said choke valve moves towards its open position, said first linkage means, said second linkage means and said abutment means being interdependently configured to cause said throttle valve to be driven toward its open position by movement of said choke valve toward its closed position only when said first and second linkage means are in abutment with each other.
  • a control mechanism according to claim 5 wherein saaid abutment means are adjustable to vary the point of abutment between said first and second linikage means.
  • a control mechanism according to claim 6 wherein said abutment means comprise screw means threadedly engaged with one of said first and second linkage means and extending therefrom for abutment with the other of said first and second linkage means.
  • a control mechanism wherein said throttle valve is fixedly mounted to a rotatable throttle shaft, and said choke valve is fixedly mounted to a rotatable choke shaft; wherein said first linkage means comprise a first choke-connected lever fixed to said choke shaft, a third choke-connected lever freely rotatably mounted upon said throttle shaft, and a second choke-connected lever pivotally connected to both said first and said third levers and extending therebetween; wherein said second linkage means comprise a throttle-connected lever fixedly mounted to said throttle shaft; and wherein said abutment means com-- prise means for effecting abutting engagement between said third choke-connected lever and said throttleconnected lever.

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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)
US487736A 1973-11-30 1974-07-11 Carburetor control mechanism Expired - Lifetime US3907945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48133565A JPS5244972B2 (sv) 1973-11-30 1973-11-30

Publications (1)

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US3907945A true US3907945A (en) 1975-09-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US487736A Expired - Lifetime US3907945A (en) 1973-11-30 1974-07-11 Carburetor control mechanism

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US (1) US3907945A (sv)
JP (1) JPS5244972B2 (sv)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2706389A1 (de) * 1976-02-16 1977-08-18 Jonsereds Fabrikers Ab Fuellungsregeleinrichtung fuer verbrennungsmotore insbesondere von motorsaegen
US4672929A (en) * 1984-12-15 1987-06-16 Andreas Stihl Automatic starting arrangement for an internal combustion engine
US5215049A (en) * 1991-06-21 1993-06-01 Andreas Stihl Portable handheld work apparatus
US5515825A (en) * 1994-04-15 1996-05-14 Sanshin Kogyo Kabushiki Kaisha Control mechanism for engine throttle and choke valves
US6439547B1 (en) * 2001-03-05 2002-08-27 Walbro Corporation Carburetor throttle and choke control mechanism
CN101839190A (zh) * 2009-03-21 2010-09-22 安德烈亚斯.斯蒂尔两合公司 汽化器装置
US20110316176A1 (en) * 2010-06-23 2011-12-29 Qi An Chen Simple start diaphragm type carburetor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57180525U (sv) * 1981-05-09 1982-11-16

Citations (4)

* 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
US2156390A (en) * 1932-05-12 1939-05-02 Carter Carburetor Corp Carburetor for internal combustion engines
US2448043A (en) * 1948-08-31 Fuel feeding apparatus foe internal
US3807709A (en) * 1970-09-24 1974-04-30 Nippon Denso Co Carburetor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448043A (en) * 1948-08-31 Fuel feeding apparatus foe internal
US1456502A (en) * 1919-02-12 1923-05-29 Auto Betterment Corp Carburetor for internal-combustion engines
US2156390A (en) * 1932-05-12 1939-05-02 Carter Carburetor Corp Carburetor for internal combustion engines
US3807709A (en) * 1970-09-24 1974-04-30 Nippon Denso Co Carburetor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2706389A1 (de) * 1976-02-16 1977-08-18 Jonsereds Fabrikers Ab Fuellungsregeleinrichtung fuer verbrennungsmotore insbesondere von motorsaegen
US4123480A (en) * 1976-02-16 1978-10-31 Jonsereds Ab Throttle control mechanism for a carburetor
US4672929A (en) * 1984-12-15 1987-06-16 Andreas Stihl Automatic starting arrangement for an internal combustion engine
US5215049A (en) * 1991-06-21 1993-06-01 Andreas Stihl Portable handheld work apparatus
US5515825A (en) * 1994-04-15 1996-05-14 Sanshin Kogyo Kabushiki Kaisha Control mechanism for engine throttle and choke valves
US6439547B1 (en) * 2001-03-05 2002-08-27 Walbro Corporation Carburetor throttle and choke control mechanism
CN101839190A (zh) * 2009-03-21 2010-09-22 安德烈亚斯.斯蒂尔两合公司 汽化器装置
US20100237516A1 (en) * 2009-03-21 2010-09-23 Jens-Peter Kern Carburetor assembly
US8511650B2 (en) * 2009-03-21 2013-08-20 Andreas Stihl Ag & Co. Kg Carburetor assembly
CN101839190B (zh) * 2009-03-21 2015-01-07 安德烈亚斯.斯蒂尔两合公司 汽化器装置
US20110316176A1 (en) * 2010-06-23 2011-12-29 Qi An Chen Simple start diaphragm type carburetor
US8297598B2 (en) * 2010-06-23 2012-10-30 Qi An Chen Simple start diaphragm carburetor

Also Published As

Publication number Publication date
JPS5244972B2 (sv) 1977-11-11
JPS5083636A (sv) 1975-07-07

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