US3575389A - Apparatus for automatic operation of a choke valve in a carburetor - Google Patents

Apparatus for automatic operation of a choke valve in a carburetor Download PDF

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Publication number
US3575389A
US3575389A US804463A US3575389DA US3575389A US 3575389 A US3575389 A US 3575389A US 804463 A US804463 A US 804463A US 3575389D A US3575389D A US 3575389DA US 3575389 A US3575389 A US 3575389A
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US
United States
Prior art keywords
temperature
cam
choke valve
valve
contact
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
US804463A
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English (en)
Inventor
Isamu Goto
Minoru Inada
Minoru Atsumi
Toyoshige Miyazaki
Mitsuaki Ninomiya
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.)
Honda Motor Co Ltd
Hitachi Astemo Ltd
Original Assignee
Honda Motor Co Ltd
Keihin Seiki Manufacturing Co Ltd
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 Honda Motor Co Ltd, Keihin Seiki Manufacturing Co Ltd filed Critical Honda Motor Co Ltd
Application granted granted Critical
Publication of US3575389A publication Critical patent/US3575389A/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
    • F02M1/08—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 choke valve in a carburetor is controlled by a temperature sensitive element which is directly coupled with a cam in turn coupled to the choke valve so that the valve will be moved in opposite directions in accordance with temperature variation of the engine irrespective of the contact of an operating member of a throttle valve with the cam.
  • a choke valve in an internal combustion engine for a motorcar, or the like is provided with a bimetallic element responsive to engine temperature so that the choke valve may be opened automatically as the engine temperature rises.
  • such choke valve may be provided with a cam for adjusting the degree of opening of a throttle valve so that it increases as the degree of opening of the choke valve is decreased, whereby the engine may properly idle even when cold.
  • the cam connected to the choke valve has been engaged with the throttle valve and thereby the degree of opening of the throttle valve is adjusted by the cam, and moreover since the engaging force between the two is stronger than the operation force of the bimetallic element (the throttle valve is provided with a valve closing spring of strong force for being brought into engagement with the cam), if the engine temperature is subsequently changed, the cam, the choke valve and the throttle valve are immovably retained in that condition and there cannot be effected automatic adjustment of these valves. Accordingly, an unavoidable inconvenience is produced
  • An object of this invention is to provide a simple and effective apparatus which overcomes the above inconvenience and in which the degree of opening of the choke valve can always be adjusted automatically according to the engine temperature regardless of whether the cam connected to the choke valve is in engagement with the throttle valve or not.
  • apparatus for the automatic operation of a choke valve which comprises a throttle valve, a rotatable cam having a smooth, continuous cam surface for adjusting the degree of opening of the throttle valve, a choke valve coupled to said cam for rotation therewith, a member coupled to said throttle valve for movement therewith to contact said cam surface so that the degree of opening of the throttle valve at idle may be increased as the degree of opening of the choke valve is decreased, strong valve closing spring means for closing the choke valve and a temperature sensing device of strong expansion force coupled to said choke valve and including temperature expansion means for expanding upon receiving heat from an internal combustion engine to cause the degree of opening of the choke valve to be automatically adjusted according to the engine temperature regardless of whether the cam surface and said member are in contact one with another.
  • FIG. I is a side view, partly in section, of the apparatus of this invention.
  • FIG. 2 is a sectional view taken along line lI-ll in FIG. 1.
  • numeral I denotes a carburetor
  • numeral 2 denotes a suction air passage thereof
  • numeral 3 denotes a choke valve
  • numeral 4 denotes a rotatable shaft of the choke valve attached at a position displaced upwards from the center of the suction air passage 2.
  • Numeral 5 denotes a cam rotatably mounted on a shaft portion 1A (FIG. 2) projecting from the carburetor I and connected to the choke valve shaft 4 as will be explained hereinafter.
  • Numeral 5A denotes a cam surface of cam 5.
  • Numeral 6' denotes a throttle valve mounted on a rotatable shaft 7
  • numeral8 denotes a throttle valve lever rigidly connected to the shaft 7 and having at its top end a contact number 8A adapted for contacting the cam surface 5A.
  • Numeral 9 denotes a return spring attached to the throttle valve lever 8 for urging the throttle valve 6 in its closing direction
  • numeral 10 denotes an adjustable stop member for establishing the closing limit of the throttle valve 6
  • numeral II denotes an operation cable for manually opening the throttle valve 6 through the throttle valve lever 8.
  • a supporting plate 12 having an engaging portion 12A is fixed to the choke valve shaft 4 and a weak spring I4 is interposed between engaging portion 12A and a stopper l3 projecting from the cam 5 to urge portion 12A toward stopper 13. Accordingly, if the amount of suction air is increased when the choke valve 3 closes the suction air passage 2, the choke valve 3 is opened against the action of the spring 14 by the suction air pressure and thereby the suction air amount is increased.
  • the above is a conventional construction.
  • the carburetor l is provided with a supporting housing 15 fixed thereto, and there is fixedly provided below the housing a temperature sensing device 16 adapted to produce a strong thermal expansion force.
  • This temperature sensing device 16 comprises, for example, a tightly closed outer tube 17, a supporting pipe 18, which is fixed in the interior thereof and is opened at its lower end, and a thermal expansion material such as ether enclosed between the two.
  • a movable rod 20 is inserted in the supporting pipe 18 and a slidable sealing member 21 is tightly mounted in the supporting pipe 18 below the lower end of the movable rod 20.
  • Numeral 22 denotes a tubular housing member for the temperature sensing device 16 and member 22 has an inlet 23 and an outlet 24 for a fluid so that the temperature sensing device 16 may be kept nearly equal to the engine temperature by the engine exhaust gases or the lubrication oil, or the like, flowing therein through the inlet 23.
  • the carburetor I is provided with a multiplication lever'26 pivoted at 25, and a pin 28 provided at the top end of the movable rod 20 is loosely mounted in a slot 27 formed in one end of the lever 26 the other end of which is connected to the cam 5 through a connecting rod 29'.
  • Numeral 30 denotes a spring receiving-plate fixed to the'middle of the movable rod 20 and numeral 31 denotes a strong valve closing spring urging the movable rod 20 toward the temperature sensing device I6. Accordingly, if the temperature of the engine increases, as measured by the temperature sensing device 16, the thermal expansion material 19 is expanded to displace the movable rod 20 from the temperature sensing device 16 against the action of the valve closing spring 31- and the movement of rod 20 is multiplied by the lever 26 for opening the choke valve 3.
  • the thermal expansion material 19 is contracted so that in' accordance therewith the movable rod 20 is displaced into the temperature sensing device 16 by the valve closing spring 31 for closing the choke valve 3.
  • the contact member 8A of the throttle valve lever 8 is pressed strongly against the cam surface 5A of the cam 5 by the return spring 9 and there is caused a large friction force between thecam surface and the contact member.
  • the choke valve 3 is operated by the temperature sensing device of strong expansion force and the strong valve closing spring 31 and, additionally, the cam surface 5A is formed as a smooth continuous curved surface, so that the expansion force of the temperature sensing device 16 and the resilient force of the valve closing spring 31 can overcome the friction force mentioned'above, whereby the choke valve 5 may be always rotated automatically in accordance with the change of the, engine temperature and, at the same time, the degree of opening of the throttle valve is automatically adjusted in accordance therewith.
  • the choke valve and the throttle valve are always automatically adjusted positively in accordance with the variation of engine temperature so that it is not required that the throttle valve operating cable ll be manually operated as in conventional arrangements.
  • Apparatus for the automatic operation of a rotatable choke valve in a carburetor comprising a throttle valve, a rotatable cam having a smooth. continuous cam surface for adjusting the degree of opening of the throttle valve, a choke valve coupled to said cam for rotation therewith about a common axis, a member coupled to said throttle valve for movement therewith about a common axis, said member resting in peripheral contact with said cam surface to follow rotation of said choke valve and cause the degree of opening of the throttle valve at idle to increase as the degree of opening of the choke valve is decreased, strong valve closing spring means for closing the choke valve and a temperature sensing device of strong expansion force coupled to said choke valve and including temperature expansion means for expanding upon receiving heat from an internal combustion engine to cause the degree of opening of the choke valve to the automatically adjusted according to the engine temperature regardless of whether the cam surface and said member are in contact one with another.
  • said temperature expansion means comprises a temperature sensitive element and a displaceable rod coupled to said LII element and said cam for rotating the latter as the element senses increased temperature.
  • said temperature sensitive element comprises an enclosed chamber containing a substance which expands with increasing temperature, and means for passing a substance whose temperature is a measure of engine temperature into contact with said enclosure, said rod extending into said enclosure and being displaced by expansion of the substance therein.
  • Apparatus as claimed in claim 6 comprising a lever between said rod and cam for multiplying the effect on said cam of the displacement of said rod.
  • said means for passing the substance whose temperature is a measure of the engine temperature into contact with the enclosure comprises a housing surrounding said enclosure and an inlet and an outlet in said housing for said substance.
  • said strong valve closing means comprises a spring having a strength to close the choke valve against the opposition ol the friction force of contact of the cam with said member.

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US804463A 1968-03-05 1969-03-05 Apparatus for automatic operation of a choke valve in a carburetor Expired - Lifetime US3575389A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1382468 1968-03-05

Publications (1)

Publication Number Publication Date
US3575389A true US3575389A (en) 1971-04-20

Family

ID=11844007

Family Applications (1)

Application Number Title Priority Date Filing Date
US804463A Expired - Lifetime US3575389A (en) 1968-03-05 1969-03-05 Apparatus for automatic operation of a choke valve in a carburetor

Country Status (4)

Country Link
US (1) US3575389A (enrdf_load_stackoverflow)
FR (1) FR2003262A1 (enrdf_load_stackoverflow)
GB (1) GB1217125A (enrdf_load_stackoverflow)
SU (1) SU376959A3 (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740040A (en) * 1971-10-07 1973-06-19 Gen Motors Corp Carburetor with power choke
US3807709A (en) * 1970-09-24 1974-04-30 Nippon Denso Co Carburetor
US4008297A (en) * 1974-09-23 1977-02-15 Regie Nationale Des Usines Renault Automatic starting device of carburetor
US4053449A (en) * 1975-02-26 1977-10-11 Honda Giken Kogyo Kabushiki Kaisha Fast-idle cam apparatus in a carburetor
US4104337A (en) * 1976-08-04 1978-08-01 Alfa Romeo S.P.A. Mixture feed regulation device for an internal-combustion engine
FR2475137A1 (fr) * 1980-02-06 1981-08-07 Weber Spa Perfectionnements a des dispositifs de starter pour carburateurs
US4460518A (en) * 1981-12-22 1984-07-17 Toyota Jidosha Kabushiki Kaisha Device for controlling the operation of a carburetor
US4500478A (en) * 1982-10-05 1985-02-19 Honda Giken Kogyo Kabushiki Kaisha Supporting apparatus for carburetor controlling cam plate
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3445839C2 (de) * 1984-12-15 1997-03-13 Stihl Maschf Andreas Startautomatik für einen Verbrennungsmotor, insbesondere den Motor einer Motorkettensäge

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1921736A (en) * 1931-12-24 1933-08-08 Erade Charles Julien Carburetor
US2400035A (en) * 1944-01-24 1946-05-07 Turf spiking machine
US2478613A (en) * 1944-10-06 1949-08-09 Detroit Lubricator Co Carburetor
US2681213A (en) * 1952-03-06 1954-06-15 Carter Carburetor Corp Throttle control for compound carburetors
US2774343A (en) * 1952-04-09 1956-12-18 Bendix Aviat Corp Choke control device
US2815942A (en) * 1949-08-09 1957-12-10 Gen Motors Corp Carburetor
US2868522A (en) * 1957-08-19 1959-01-13 William E O'neil Carburetor
US2998233A (en) * 1959-11-18 1961-08-29 Holley Carburetor Co Automatic choke
US3151189A (en) * 1961-09-11 1964-09-29 Ford Motor Co Carburetor
US3291462A (en) * 1961-04-15 1966-12-13 Sibe Carburetors comprising an automatic auxiliary starting device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1921736A (en) * 1931-12-24 1933-08-08 Erade Charles Julien Carburetor
US2400035A (en) * 1944-01-24 1946-05-07 Turf spiking machine
US2478613A (en) * 1944-10-06 1949-08-09 Detroit Lubricator Co Carburetor
US2815942A (en) * 1949-08-09 1957-12-10 Gen Motors Corp Carburetor
US2681213A (en) * 1952-03-06 1954-06-15 Carter Carburetor Corp Throttle control for compound carburetors
US2774343A (en) * 1952-04-09 1956-12-18 Bendix Aviat Corp Choke control device
US2868522A (en) * 1957-08-19 1959-01-13 William E O'neil Carburetor
US2998233A (en) * 1959-11-18 1961-08-29 Holley Carburetor Co Automatic choke
US3291462A (en) * 1961-04-15 1966-12-13 Sibe Carburetors comprising an automatic auxiliary starting device
US3151189A (en) * 1961-09-11 1964-09-29 Ford Motor Co Carburetor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807709A (en) * 1970-09-24 1974-04-30 Nippon Denso Co Carburetor
US3740040A (en) * 1971-10-07 1973-06-19 Gen Motors Corp Carburetor with power choke
US4008297A (en) * 1974-09-23 1977-02-15 Regie Nationale Des Usines Renault Automatic starting device of carburetor
US4053449A (en) * 1975-02-26 1977-10-11 Honda Giken Kogyo Kabushiki Kaisha Fast-idle cam apparatus in a carburetor
US4104337A (en) * 1976-08-04 1978-08-01 Alfa Romeo S.P.A. Mixture feed regulation device for an internal-combustion engine
FR2475137A1 (fr) * 1980-02-06 1981-08-07 Weber Spa Perfectionnements a des dispositifs de starter pour carburateurs
US4351782A (en) * 1980-02-06 1982-09-28 Weber S.P.A Cold-engine starting and operating devices for carburetors
US4460518A (en) * 1981-12-22 1984-07-17 Toyota Jidosha Kabushiki Kaisha Device for controlling the operation of a carburetor
US4500478A (en) * 1982-10-05 1985-02-19 Honda Giken Kogyo Kabushiki Kaisha Supporting apparatus for carburetor controlling cam plate
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

Also Published As

Publication number Publication date
SU376959A3 (enrdf_load_stackoverflow) 1973-04-05
FR2003262A1 (enrdf_load_stackoverflow) 1969-11-07
DE1910978B2 (de) 1973-02-15
DE1910978A1 (de) 1969-10-02
GB1217125A (en) 1970-12-31

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