US3848857A - Carburettors provided with a starting device with an eccentric flap valve - Google Patents

Carburettors provided with a starting device with an eccentric flap valve Download PDF

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Publication number
US3848857A
US3848857A US00373748A US37374873A US3848857A US 3848857 A US3848857 A US 3848857A US 00373748 A US00373748 A US 00373748A US 37374873 A US37374873 A US 37374873A US 3848857 A US3848857 A US 3848857A
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United States
Prior art keywords
cam
carburettor
valve
thermostatic member
flap valve
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Expired - Lifetime
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US00373748A
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English (en)
Inventor
A Mennesson
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.)
Societe Industrielle de Brevets et dEtudes SIBE
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Societe Industrielle de Brevets et dEtudes SIBE
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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 fast idling cam cooperates with a second thermostatic member, to partly open the usual throttle member of the carburettor when the flap valve is at least partially closed.
  • Pneumatic means sensitive to the pressure which exists in the intake pipe downstream of the throttle member control the opening of the valve when the pressure diminishes.
  • Stop means with several positions, limit, in variable manner as a function of the position that they occupy, the movement of the pneumatic means.
  • Means sensitive to the ambient temperature control the position occupied by the stop means.
  • the invention relates to carburettors of the type which comprise an eccentric flap valve starting device located in the air intake of the carburettor upstream of the system for the introduction of the primary air/fuel mixture, which valve is actuated by the air flow inspired by the carburettor against the effect of a first thermostatic member which tends to shut this valve when the temperature of an element of the engine is less than a given limit, said carburettor comprising in addition a cam called an accelerated or fast idling cam adapted to cooperate with a second thermostatic member, said cam being designed to partly open the usual throttle member of the carburettor when the starting valve is at least partiallyclosed, pneumatic means sensitive to the pressure which exists in the intake pipe downstream of the throttle member being provided to control, by their movement, the opening of the flap valve when the abovesaid pressure diminishes.
  • the regulations relating to atmospheric pollution require the supply to the engine of mixtures whose richness is as low as possible, at least for temperatures in the neighbourhood of 20C. However, for lower temperatures, it is necessary to supply to the engine, after starting, richer mixtures in order to avoid stalling.
  • the opening of the flap valve after starting which conditions the richness of the air-fuel mixture, must depend on the ambient temperature at which the engine is started.
  • a carburettor of the type defined above is characterised by the fact that it comprises stop means with several positions, adapted to limit in variable manner as a function of the position that they occupy, the movement of the pneumatic means, and means sensitive to ambient temperature adapted to control the position occupied by the stop means.
  • these stop means with several positions are constituted by a stepped rotary cam, the various angular positions taken by the cam being controlled by means sensitive to the ambient temperature.
  • the stepped cam is constituted by a peripheral portion of the cam of fast idling, different from the zone serving for the regulation of the opening of the usual throttle member; the means sensitive to ambient temperature are then constituted by the second thermostatic member of which one end is anchored at a fixed point and of which the other end is unchored on the fast idling" cam.
  • the pneumatic means can be constituted by a diaphragm capsule connected to a rod of which the displacements control the opening of the flap valve; the rod comprises, advantageously, at its end distant from the diaphragm, a curved arm bearing an adjustable stop adapted to cooperate with the abovesaid stepped cam.
  • FIG. 1 of these drawings shows diagrammatically, in elevation, with portions removed, a carburettor constructed according to the invention, and of which the elements occupy positions corresponding to the stopped engine and at ambient temperature.
  • FIG. 2 is a section along the line II-II of FIG. 1, of certain elements of the carburettor.
  • FIG. 3 lastly, shows similarly to FIG. 1, the carburettor with its elements in the positions which they occupy when the engine rotates at fast idling speed at an average temperature less than the normal temperature of operation of the engine.
  • the carburettor As regards the carburettor as a whole, it is constituted essentially by a principal pipe 1 provided with an air intake 2 and with a conventional system for the introduction of the primary mixture (not shown).
  • the starting device it is constituted by an eccentric flap valve 3 mounted on an axle 4 upstream of the abovesaid system (the direction of flow is that indicated by the arrow of FIGS. 1 and 3) and actuated by the air flow sucked through the carburettor against the effect of a first thermostatic member 5 (shown in FIG. 2) constituted by a bimetallic spiral which tends to close the flap valve when the temperature of an element of the engine is less than a given limit.
  • a first thermostatic member 5 shown in FIG. 2 constituted by a bimetallic spiral which tends to close the flap valve when the temperature of an element of the engine is less than a given limit.
  • the usual throttle member 6 of the carburettor is constituted by a butterfly valve mounted on an axle 7 downstream of the abovesaid system and actuated by the usual accelerated control (not shown) which, when it is released, tends to bring back the said throttle member to its minimum open position, this position being adjustable by a fast idling cam 8.
  • this cam acts through steps 8a on an adjustable stop screw 10 borne by a lever 11, keyed on an axle l2 and connected through a linkage 13 to a lever 14 fast to the axle 7 of the butterfly valve 6.
  • the cam 8 is mounted freely on a fixed bush 15 (FIG. 2) on the inside of which an axle 16 passes freely.
  • the bush 15 is driven into a case 17 which contains the thermostatic member 5; the case 17 is closed by a cap 18 of insulating material, which supports the member 5 and an electrical resistance 19 connected to the ignition circuit of the engine so as to cause heating of the member 5 as soon as the engine rotates.
  • the end 20a is curved towards the inside of the case 17 to constitute a sort of finger around which is wound the movable end of the thermostatic element 5. This portion a will hence be drawn by the movable end of the element 5.
  • the other end 20b of the lever 20 is curved in the opposite direction to the end 20a.
  • a lever 22 is fixed, by a nut 21, to the other end of the axle 16, spaced from the lever 20.
  • the lever 22 is connected by a linkage 23 visible in FIGS. 1 and 3, to a lever 24 fast to the axle 4 of the valve 3.
  • the second thermostatic member 9 is constituted by a bi-metallic spiral wound around the bush 15, the central end of this spiral being made fast by anchoring to this bush and its opposite end 9a (FIGS. 1 and 3) being radially curved and wound around a pin 25 fast to the cam 8.
  • This end 9a is hence anchored to the cam 8 and the second member 9 can drive the cam 8 either in clockwise direction or in the opposite direction.
  • This thermostatic member 9 is adjusted so that its end 9a moves in anticlockwise direction when it heats
  • the whole is arranged so that, when the thermostatic member 5 heats up, it causes rotation of the cam 8 in anticlockwise direction.
  • a helical spring 26 (FIG. 2) is wound around the axle 16 between the bush l5 and the lever 22; one end 26a of this spring is curved in the direction of the axle 16 and housed in a hole 27 of the lever 22.
  • the other end 26b of the spring 26 is constituted by a rectilinear part parallel to a radius of the cam 8, intended to cooperate with the pin 25 borne by this cam.
  • the lever 11, whose shape is clear from FIGS. 1 and 3, has one end 11a curved in a direction perpendicular to the plane of the whole of the lever 11. This end 11a is adapted to cooperate with a part 22a of the lever 22.
  • the part 220 has the shape of an elbow oriented perpendicular to the average direction of the whole of the lever 22. Under these conditions, when the opening of the butterfly valve 6 is actuated, the lever 11 will turn in clockwise direction about the axle 12 and its end 1 1a will cooperate with the part 22a so that minimum opening is imposed on the valve 3.
  • the pneumatic means sensitive to the pressure which exists in the intake pipe 1 downstream of the butterfly valve 6, provided to actuate, by their movement, the opening of the valve 3 when the abovesaid pressure diminishes, are advantageously constituted by a capsule C (FIGS. 1 and 3) with a diaphragm 28. This diaphragm 28 separates the capsule into two chambers 29 and 30.
  • the chamber 29 is placed at atmospheric pressure, whilst the chamber 30 is connected through a passage (shown diagrammatically) to an orifice 31 opening into the pipe 1 downstream of the butterfly valve 6.
  • the diaphragm 28 is gripped between two cups 32 and 33 and is coupled, through the latter, to a stem 34 extending parallel to a diameter of the casing 17 and passing through the latter into a groove g (FIG. 2) provided for this purpose.
  • the stem 34 comprises a notch e bounded, on the side distant from the diaphragm 28, by an edge 34a, perpendicular to the longitudinal direction of the stem 34.
  • the end 201) of the lever 20 becomes lodged in the notch 2 so that the edge 340 can cooperate with this end 20b.
  • stop means B (FIGS. 1 and 3) with several positions, adapted to limit, in variable manner as a function of the position that they occupy, the movement of the pneumatic means and more specifically, of the stem 34.
  • means T sensitive to ambient temperature, adapted to control the position occupied by the stop means B.
  • stop means B are constituted preferably by a stepped rotary cam which is advantageously constituted by a peripheral portionp of the cam 8, different from the zone including the steps 8a serving for the adjustment of the opening of the butterfly valve 6.
  • This zone p includes also steps 8b staggered angularly and such that, according to the position occupied by the cam 8, the limit imposed on the movement of the stem 34 varies.
  • the stop means B being constituted by a portion of the cam 8, the means T sensitive to ambient temperature are then constituted by the second thermostatic member 9 of which the end is anchored on the pin 25.
  • the end 34b of the stem 34 is situated in a plane perpendicular to the longitudinal direction of the stem 34 as seen in FIG. 2.
  • the stem end 3417 bears a screw 36 serving as an adjustable stop adapted to cooperate with the steps 8b of the cam 8.
  • the elements of the carburettor occupy the positions shown in FIG. 1.
  • the cam 8 actuated by the thermostatic element 9 is in a position such that the screw 10 is in abutment on a step 8a which ensures wide opening of the butterfly valve 6.
  • the distance which separates the screw 36 from the steps 8b is slight so that, after starting of the engine, when the pressure in the chamber 30 tends to move the stem 34 towards the right in FIGS. 1 and 2, the stroke of this stem will be slight.
  • the end 20b drawn by the edge 34a will have a slight movement and the valve 3 will be little opened, thus ensuring a considerable enrichment of the air-fuel mixture admitted to the engine, necessary by reason of the low ambient temperature.
  • the element 9 imposes a position on the cam 8 (see FIG. 3) which is such that on the one hand, the butterfly valve 6 is further closed at idling than in the case of FIG. 1 and that, on the other hand, the screw 36 comes into abutment on a step 8b which is closer to the axle 16 than in the case of FIG. 1.
  • the movement of the stem 34 under the action of low pressure existing at the orifice 31, is greater even than the rotation of the lever 22.
  • the valve 3, after starting of the engine is open more than in the case of FIG. I, which gives a lesser enrichment than at low temperature but sufficient for the engine to turn normally.
  • valve 3 after starting of the engine, takes a precise position which depends on the ambient temperature at starting and which is independent of the friction of the control elements of the valve.
  • the electrical resistance 19 (FIG. 2), is heated and transmits heat to the element 5 which is deformed and then makes the axle 16 and the lever 22 rotate in anticlockwise direction.
  • the end 26b of the spring 26 drawn by the lever 22 engages with the pin 25; from this moment, it is the rotation of the axle 16 which controls the rotation of the cam 8 until the latter takes the position which corresponds to normal idling and to an opening of the butterfly valve 6 less than that which it had on starting.
  • the lever 22 by actuating the linkage 23 of the lever 24 fully opens the valve 3.
  • Carburettor comprising a starting device with an eccentric flap valve situated in an air intake of the carburettor upstream of an intake system for the primary air/fuel mixture, said valve being actuated by the air flow inspired by the carburettor against the effect of a first thermostatic member which tends to close said flap valve when the temperature of an element of the engine is below a given limit, said carburettor comprising in addition a cam called a fast idling cam adapted to cooperate with a second thermostatic member, said cam being intended to partly open the usual throttle member of the carburettor when the flap valve is at least partially closed, pneumatic means sensitive to the pressure in the intake pipe downstream of the throttle member being provided to control, by their movement, the opening of the valve when said pressure diminishes, said carburettor also comprising stop means with several positions, adapted to limit, in variable manner as a function of said position that they occupy, the movement of the pneumatic means, and said second themestatic member constituting means sensitive to the ambient temperature arranged to
  • stepped cam is constituted by a peripheral part of the fast idling cam, different from the zone serving for the adjustment of the opening of the usual throttle member, the second thermostatic member having one end anchored at a fixed point and the other end anchored to the fast idling" cam.
  • th pneumatic means are constituted by a diaphragm capsule controlling the movements of a stem, and the stem comprises, at its end distant from the diaphragm, a curved arm bearing a screw constituting an adjustable stop, adapted to cooperate with the stop means in several positions.
  • stem comprises, in its middle part, a notch bounded by an edge, adapted to cooperate with the end of a lever controlling the opening of the. flap valve, this lever being connected, at its other end, to the first thermostatic member.
  • a helical spring is mounted around the axle between the arm and the neighbouring end of the bush, said spring being anchored, at one end in said arm and at its other end, comprising a rectilinear part arranged to cooperate, for a sufficient rotation of the arm, with a pin fast to the cam so that the latter is rotated by the arm.
  • the pneumatic means are constituted by a diaphragm cap sule controlling the movements of a stem, and the stem comprises, at its end distant from the diaphragm a curved arm bearing a screw constituting an adjustable stop, adapted to cooperate with the stop means in several positions.

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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)
US00373748A 1972-07-31 1973-06-26 Carburettors provided with a starting device with an eccentric flap valve Expired - Lifetime US3848857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7227507A FR2194234A5 (enrdf_load_stackoverflow) 1972-07-31 1972-07-31

Publications (1)

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US3848857A true US3848857A (en) 1974-11-19

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US00373748A Expired - Lifetime US3848857A (en) 1972-07-31 1973-06-26 Carburettors provided with a starting device with an eccentric flap valve

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US (1) US3848857A (enrdf_load_stackoverflow)
JP (1) JPS5636297B2 (enrdf_load_stackoverflow)
AR (1) AR199215A1 (enrdf_load_stackoverflow)
BR (1) BR7305837D0 (enrdf_load_stackoverflow)
DE (1) DE2338771C3 (enrdf_load_stackoverflow)
ES (1) ES417772A1 (enrdf_load_stackoverflow)
FR (1) FR2194234A5 (enrdf_load_stackoverflow)
GB (1) GB1426839A (enrdf_load_stackoverflow)
IT (1) IT991992B (enrdf_load_stackoverflow)
SE (1) SE401713B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962380A (en) * 1975-10-14 1976-06-08 Ford Motor Company Carburetor with combined choke pulldown and fast idle cam kickdown apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2266808A2 (en) * 1974-04-05 1975-10-31 Sibe Carburettor with temperature dependent choke flap - throttle flap and choke flap thermostat unit ends are connected to each other
FR2391367A2 (fr) * 1977-05-18 1978-12-15 Sibe Perfectionnements aux carburateurs comprenant un dispositif de depart
FR2470254A1 (fr) * 1979-11-23 1981-05-29 Sibe Perfectionnements aux carburateurs comportant un dispositif de depart a volet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB799345A (en) * 1956-05-07 1958-08-06 Sibe Improvements in systems including an internal combustion engine provided with a carburettor fitted with an automatic starting and cold running device
US3272486A (en) * 1963-03-26 1966-09-13 Holley Carburetor Co Carburetor having an automatic choke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB799345A (en) * 1956-05-07 1958-08-06 Sibe Improvements in systems including an internal combustion engine provided with a carburettor fitted with an automatic starting and cold running device
US3272486A (en) * 1963-03-26 1966-09-13 Holley Carburetor Co Carburetor having an automatic choke

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3962380A (en) * 1975-10-14 1976-06-08 Ford Motor Company Carburetor with combined choke pulldown and fast idle cam kickdown apparatus

Also Published As

Publication number Publication date
DE2338771B2 (de) 1979-03-01
FR2194234A5 (enrdf_load_stackoverflow) 1974-02-22
SE401713B (sv) 1978-05-22
AU5745673A (en) 1975-01-09
DE2338771A1 (de) 1974-02-14
ES417772A1 (es) 1976-02-16
IT991992B (it) 1975-08-30
GB1426839A (en) 1976-03-03
DE2338771C3 (de) 1979-10-18
BR7305837D0 (pt) 1974-06-27
JPS504428A (enrdf_load_stackoverflow) 1975-01-17
AR199215A1 (es) 1974-08-14
JPS5636297B2 (enrdf_load_stackoverflow) 1981-08-22

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JPS5911739B2 (ja) 内燃機関の気化器