EP0029769B1 - Carburateur comportant un dispositif de départ à volet - Google Patents

Carburateur comportant un dispositif de départ à volet Download PDF

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Publication number
EP0029769B1
EP0029769B1 EP19800401604 EP80401604A EP0029769B1 EP 0029769 B1 EP0029769 B1 EP 0029769B1 EP 19800401604 EP19800401604 EP 19800401604 EP 80401604 A EP80401604 A EP 80401604A EP 0029769 B1 EP0029769 B1 EP 0029769B1
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EP
European Patent Office
Prior art keywords
carburetor
flap
pneumatic means
chamber
wall
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
Application number
EP19800401604
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0029769A1 (fr
Inventor
Gaston Arnaud
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
Original Assignee
Societe Industrielle de Brevets et dEtudes SIBE
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Publication date
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Publication of EP0029769A1 publication Critical patent/EP0029769A1/fr
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Publication of EP0029769B1 publication Critical patent/EP0029769B1/fr
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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

  • the invention relates to carburetors of the type which include: a starting device with an eccentric flap situated in the air inlet of the carburetor, upstream of the outlet of a system for introducing the primary air mixture and fuel, shutter actuated by the air stream drawn in by the carburetor against the action of a first thermostatic member which tends to close the shutter when a temperature is below a given limit; an accelerated idle cam adapted to cooperate with a second thermostatic member and intended to open the throttle member controlled by the driver when the starting flap is closed, at least partially; pneumatic means sensitive to the depression which prevails in the intake duct of the carburetor and which control, by their movement, the opening of the shutter when the said depression increases; and stop means with several positions, sensitive to the ambient temperature and which limit, in a variable manner as a function of the position which they occupy, the displacement of the pneumatic means.
  • Such a carburetor is described and claimed in patent FR-A-2 194 234.
  • the stop means at several positions consist of steps of a stepped rotary cam whose angular position is controlled by means sensitive to ambient temperature and which also constitutes an accelerated idle cam.
  • the pneumatic means generally consist of a membrane capsule linked to a rod whose movements control the opening of the shutter, provided with an arm carrying an adjustable stop capable of cooperating with the steps.
  • the stop means the position of the flap immediately after departure is precisely adjusted as a function of the ambient temperature. Consequently, an enrichment of the air / fuel mixture is obtained, at accelerated idle, which can be low when the ambient temperature reaches at least 20 ° C., without compromising the smooth running at low temperature since the enrichment is then higher. .
  • the pneumatic means are connected downstream of the throttle member, operation may not be satisfactory under the following conditions: if a long period of time elapses after starting the cold engine without that the throttle valve is wide open (which can happen in city traffic, for example) the depression exerted on the pneumatic means remains sufficiently large to keep these means in abutment on the stop means against the action of the return spring planned to oppose this support.
  • the friction between the pneumatic means and the abutment means can be high enough to prevent the cam from turning during the reheating of the engine, all the more so since this reheating acts through a thermostatic member which is generally a bimetallic strip which can exert only a limited torque on the rotary cam.
  • the abutment means can remain blocked in a position which corresponds to a cooler engine. The air / fuel mixture supplied to the engine then becomes too rich.
  • the carburetor described in patent application FR-A-2 391 367 comprises pneumatic means comprising, in addition to a first return spring acting permanently, a second return spring which increases the force as a reminder when the stroke of the pneumatic means, under the action of the vacuum prevailing in the intake duct, exceeds a amplitude determined from their rest position; it is thus easier to obtain the clearance of the stepped rotary cam than before.
  • pneumatic means comprising, in addition to a first return spring acting permanently, a second return spring which increases the force as a reminder when the stroke of the pneumatic means, under the action of the vacuum prevailing in the intake duct, exceeds a amplitude determined from their rest position; it is thus easier to obtain the clearance of the stepped rotary cam than before.
  • there remains the need to open the main throttling member notably to release the abutment means.
  • the present invention aims to provide a carburetor in which the abutment means are liberated by a small opening of the throttle member, without that the effect of the pneumatic means on the opening of the shutter is lost.
  • the invention provides a carburetor in which the pneumatic means comprise two movable walls coupled to one another by a bidirectional connection comprising a determined clearance, the first of which, which cooperates directly with the stop means, is active when the throttle does not exceed the idle position and the second is active when the throttle exceeds this position.
  • the pneumatic means must be provided with elastic return means which are advantageously of the type described in patent application FR-A-2 391 367, the first spring cooperating with the second movable wall.
  • the two movable walls delimit a chamber connected to a point of the intake duct situated immediately downstream of the location occupied by the edge of the choke member ment when the latter is in the accelerated idle position corresponding to the lowest temperature for which the carburetor is provided.
  • the first wall can thus be subjected to the difference between the atmospheric pressure and the pressure in the chamber, the sedonde to the difference between the pressure in the chamber and the pressure at a point of the intake duct located permanently downstream of the throttling organ.
  • the description refers to the single figure which accompanies it and shows, in schematic section, the starting system of a carburetor according to the invention, the various elements being in the position which they occupy when the engine is running at accelerated idle. , at a temperature which is not the lowest of those for which it is intended.
  • the carburetor shown of the inverted type, has a general constitution similar to that described in patent publication FR 2 391 367 to which reference may be made. It comprises an intake duct 1 provided with an air inlet 2 and with a conventional system for introducing the primary mixture (not shown).
  • the starting device comprises an eccentric flap 3 mounted on an axis 4, upstream of said system (the direction of circulation being indicated by an arrow), and actuated by the current of air sucked in by the carburetor against the action of a first thermostatic member 5 which tends to close the shutter when the temperature of an element which heats up at the same time as the motor is below a given limit.
  • the member 5 may be provided so as to no longer exert appreciable forces on the shutter in the closing direction as soon as the temperature of the engine cooling water exceeds 65 ° C.
  • This organ is generally a bimetallic spiral, which can exert only a weak effort.
  • the usual throttling member 6 of the carburetor is constituted by a butterfly mounted on an axis 7 downstream of the introduction system and actuated by the driver.
  • the throttle member 6 returns to its minimum open position, determined by an accelerated idle cam 8.
  • the cam 8 shown is provided with steps 8a d support of an adjustable stop screw 10, carried by a lever 11 fixed on the rotary axis 12 and connected by a rod 13 to a lever 14 secured to the axis 7 of the butterfly 6.
  • the cam 8 rotates freely on a fixed socket (not visible in the figure) inside which a pin 16 passes freely.
  • the socket is fitted in a housing containing the first thermostatic member 5 and closed by a cover supporting an electrical resistance connected to the ignition circuit of the engine so as to heat the thermostatic member 5 as soon as the engine is running.
  • the thermostatic member 5 can be heated by any other means, such as for example the engine cooling water.
  • the end of the axis 16 located in the housing is fixed to a lever 20 bent at its ends 20a and 20b in the direction of the axis 16.
  • the end 20a constitutes a finger to which the movable end of the thermostatic element 5 and will be driven by this end.
  • a lever 22 is fixed by a nut 21 at the other end of the axis 16, distant from the lever 20.
  • the lever 22 is connected by a rod 23 to a lever 24 secured to the axis 4 of the shutter 3.
  • a second thermostatic member 9 is also constituted by a bimetallic spiral, the external end 9a of which is wound around a lug 25 integral with the cam 8. This end 9a is thus anchored on the cam 8 and drives this cam in the direction of clockwise rotation when the member 9 cools, in the opposite direction when it heats.
  • the internal end of the bimetallic spiral 9 is fixed on the axis 16 integral with the lever 20.
  • the lever 22 has a finger 27 which can cooperate by abutment with the lug 25 of the cam 8 to limit the angular movement that the second thermostatic member 9 tends to impose on the cam 8 when its temperature decreases.
  • the lever 11 has one end 11 a bent perpendicular to the plane of the assembly of the lever 11. This end 11 a is adapted to cooperate by abutment with a part 22a of the lever 22. When the driver opens the throttle member or butterfly 6, the lever 11 rotates clockwise around the axis 12 and its end 11 abuts against the part 22a and imposes a minimum opening on the flap 3.
  • Pneumatic means provided for controlling the opening of the shutter 3 when the vacuum in the intake duct 1 increases, comprise a pneumatic element D provided with a rod 34.
  • the rod 34 has a notch e limited, on the side remote from the element D, by an edge 34a perpendicular to the longitudinal direction of the rod 34.
  • the end 20b of the lever 20 is housed in the notch e so that the edge 34a can cooperate by abutment with this end 20b.
  • the end 34b of the rod 34 carries a screw 36 serving as an adjustable stop, suitable for cooperating via its terminal part 36a with the steps 8b of the cam 8 to limit the controlled opening of the shutter 3.
  • This spring 40 surrounds a part 41 of the rod 34 of reduced diameter relative to the rest of the rod; it is precompressed between, on the one hand, the end 34b of the rod 34 and, on the other hand, an annular support piece 42 which can slide along the cylindrical part 41 of the rod 34 and which it tends to apply against a shoulder 44 of said rod 34.
  • the ring 42 has an external diameter greater than the largest dimension of a passage formed to accommodate the rod 34 inside a boss of the carburetor body.
  • the pneumatic element D of the carburetor shown in the figure comprises two movable walls constituted by membranes 51 and 56 placed in a housing 50.
  • the first membrane 51 is directly coupled to the rod 34.
  • This membrane 51 separates a chamber 52, maintained at atmospheric pressure, from a chamber 53 connected, by a channel 54, to an orifice 55 opening into the conduit 1 at a point which passes from downstream to upstream of the edge of the throttle valve 6 when the latter is opened from its accelerated idle position.
  • This point could be placed immediately downstream of the position taken by the butterfly 6 when the screw 36 rests on the highest step 8b of the cam 8.
  • the pneumatic element D makes it possible to maintain a pneumatic assistance for opening the shutter 3 when this position is exceeded.
  • the second membrane 56 separates the chamber 53 from a chamber 57 connected to a point 58 of the conduit 1 located permanently downstream of the butterfly 6, by a channel 59. It is linked to the membrane 51 by a mechanical connection having a clearance j .
  • the illustrated link is constituted by a rod 60 coupled to the membrane 56 and whose open end 61 is held inside a stirrup 62 secured to the membrane 51, stirrup in which it can move between two stop positions 63 and 64.
  • the clearance j is given the lowest possible value for which the duration of release of the cam 8, when the throttle 6 is opened from idle to a partially open position is sufficient for this cam takes an equilibrium position under the action of the bimetallic spiral 5. This clearance j will depend to a certain extent on the volume of the chamber 53 and on the passage section offered by the conduit 54. It will not exceed 1 mm in general; its value will typically be a few tenths of a millimeter.
  • a spring 65 disposed in the chamber 57 tends to push the membrane 56 to the left of the figure.
  • the membrane 51 subjected on one side to atmospheric pressure and on the other face to the depression prevailing in the conduit 1 downstream of the butterfly 6, pulls the rod 34 to the right of the figure, thus maintaining the part terminal 36a of the screw 36 in abutment on a step 8b of the cam 8, against the force of the spring 40; the open end portion 61 of the rod 60 is held in abutment on the abutment face 63 inside the stirrup 62, by the force of the spring 65, of stiffness much less than the stiffness of the spring 40.

Landscapes

  • 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)
EP19800401604 1979-11-23 1980-11-07 Carburateur comportant un dispositif de départ à volet Expired EP0029769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7928999A FR2470254A1 (fr) 1979-11-23 1979-11-23 Perfectionnements aux carburateurs comportant un dispositif de depart a volet
FR7928999 1979-11-23

Publications (2)

Publication Number Publication Date
EP0029769A1 EP0029769A1 (fr) 1981-06-03
EP0029769B1 true EP0029769B1 (fr) 1983-05-04

Family

ID=9232055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401604 Expired EP0029769B1 (fr) 1979-11-23 1980-11-07 Carburateur comportant un dispositif de départ à volet

Country Status (4)

Country Link
EP (1) EP0029769B1 (ja)
JP (1) JPS5683538A (ja)
DE (1) DE3062983D1 (ja)
FR (1) FR2470254A1 (ja)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3606983A (en) * 1969-04-21 1971-09-21 Holley Carburetor Co Carburetor having an automatic choke
FR2194234A5 (ja) * 1972-07-31 1974-02-22 Sibe
FR2239594A2 (en) * 1973-07-31 1975-02-28 Sibe Carburettor with eccentric starting butterfly - air flow is sucked in against thermostat controlled closing action
FR2391367A2 (fr) * 1977-05-18 1978-12-15 Sibe Perfectionnements aux carburateurs comprenant un dispositif de depart
JPS53148626A (en) * 1977-05-31 1978-12-25 Toyota Motor Corp Choke breaker for carburetor for internal combustion engine

Also Published As

Publication number Publication date
FR2470254B1 (ja) 1981-12-11
JPS5683538A (en) 1981-07-08
DE3062983D1 (en) 1983-06-09
EP0029769A1 (fr) 1981-06-03
FR2470254A1 (fr) 1981-05-29

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