EP0416200A2 - Dispositif pour le mélange du carburant et de l'air dans les moteurs à combustion interne - Google Patents

Dispositif pour le mélange du carburant et de l'air dans les moteurs à combustion interne Download PDF

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Publication number
EP0416200A2
EP0416200A2 EP19900106340 EP90106340A EP0416200A2 EP 0416200 A2 EP0416200 A2 EP 0416200A2 EP 19900106340 EP19900106340 EP 19900106340 EP 90106340 A EP90106340 A EP 90106340A EP 0416200 A2 EP0416200 A2 EP 0416200A2
Authority
EP
European Patent Office
Prior art keywords
throttle body
nozzle
fuel
lever
rod
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.)
Withdrawn
Application number
EP19900106340
Other languages
German (de)
English (en)
Inventor
Uwe Neutzer
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
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 Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of EP0416200A2 publication Critical patent/EP0416200A2/fr
Withdrawn legal-status Critical Current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
    • F02M9/00—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position
    • F02M9/12—Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type; Carburettors having fuel-air mixing chambers of variable shape or position having other specific means for controlling the passage, or for varying cross-sectional area, of fuel-air mixing chambers
    • F02M9/127—Axially movable throttle valves concentric with the axis of the mixture passage
    • F02M9/133—Axially movable throttle valves concentric with the axis of the mixture passage the throttle valves having mushroom-shaped bodies

Definitions

  • the invention relates to a fuel-air mixture formation device for internal combustion engines with a rotationally symmetrical nozzle body which, together with a rotationally symmetrical throttle body displaceable therein, forms a convergent-divergent nozzle which opens into an intake manifold of the internal combustion engine, a fuel air gap rotating around the convergent-divergent nozzle opens into the nozzle with a circumferential gap opening and fuel mixed with air is injected from the gap opening approximately transversely to the direction of the main air mass flow into the nozzle.
  • a mixture formation device is known from DE 36 43 882 A1.
  • the object is achieved in that the guide of the throttle body by means of a centric to the nozzle in the housing of the mixture tion device mounted guide tube on which the throttle body is axially displaceably mounted, wherein the actuating means for moving the throttle body is arranged within the guide tube.
  • the throttle body is thus guided and actuated essentially via two elements, namely the guide tube and the actuating means. Both elements penetrate the central area of the throttle body, the central arrangement of the guide tube ensures the central position of the throttle body in all throttle body positions, whereby an optimal guide length is ensured, since the actuating means is guided through it independently of the function of the guide tube.
  • the throttle body is expanded in the inflow region of the main air mass flow and is tapered in the outflow region, the guide tube of the throttle body being mounted in the region of the housing of the mixture formation device assigned to the inflow region of the throttle body.
  • the expanded area of the throttle body is thus preferably used for mounting the throttle body, a recess in the throttle body receives the guide tube, through which extends the actuating means, which advantageously engages in the tapered area of the throttle body.
  • the actuating means is advantageously designed as a rod which is fixedly connected to the throttle body, with which both thrust and tensile forces can be applied to the throttle body to close or open it.
  • the rod can, for example, be soldered into a recess made in the interior of the throttle body and adjoining the bore for the guide tube.
  • the rod is expediently actuated via a in the flow area of the throttle body in the housing of the Mixing device mounted lever. Since when the lever is actuated for the purpose of axial displacement of the throttle body, the attachment point of the rod on the lever describes a circular arc around the pivot point of the lever and thus the attachment point is shifted not only in the axial but also in the radial direction, the rod should expediently be designed to be flexible.
  • the position of the fulcrum of the lever relative to the position of the fastening point of the rod on the throttle body should advantageously be chosen such that the total radial displacement of the fastening point is divided into two equal path lengths, based on the rod fastening on the throttle body. This makes it possible to keep the radial forces on the throttle body guide small.
  • the actuating means is designed as a rod, rather a wide variety of means for achieving an axial displacement of the throttle body are conceivable, for example a band-like element, in particular a metal band, a rope-like element, in particular a traction rope, but at least in the case of adjusting means which are only suitable for the transmission of tensile forces, one or more spring elements should be provided which prestress the throttle body in the opposite direction.
  • the actuating means is designed as a tension element, in particular a metal strip, firmly connected to the throttle body, the tension element being deflected around a deflection element mounted in the housing of the mixture formation device and at the end of the tension element facing away from the throttle body, a lever end of a lever end mounted in the housing Lever attacks.
  • a tension element in particular a metal strip
  • the tension element being deflected around a deflection element mounted in the housing of the mixture formation device and at the end of the tension element facing away from the throttle body, a lever end of a lever end mounted in the housing Lever attacks.
  • an imaginary longitudinal axis of the fuel-air mixture formation device for the gasoline engine, around which parts of this mixture formation device are formed symmetrically, is designated by 1.
  • a nozzle body 2 with its inner wall 3 is essentially rotationally symmetrical.
  • the interior space delimited by the inner wall in the nozzle body tapers continuously from its lower region 4 up to one Place the narrowest clear cross-section.
  • This is followed at the top by a diffuser 5, which opens into a suction pipe (not shown) of the internal combustion engine.
  • the fuel-air mixture formation device is acted upon by air through the openings 6 via an air filter (also not shown).
  • the main air mass flow therefore flows in the direction of arrow L from bottom to top.
  • a throttle body 7 which is also rotationally symmetrical about the longitudinal axis and is adjustable in the direction of the longitudinal axis according to double arrow A, is used in connection with the nozzle body 2.
  • the throttle body is essentially designed as a cone with an upward-pointing tip 8, it additionally has a cylindrical projection 9 at the bottom.
  • the nozzle body 2 forms, together with the throttle body 7, a convergent-divergent nozzle 10 with a narrowest cross section that is variable due to the adjustment possibility of the throttle body 7.
  • the nozzle body 2 is divided into an upper nozzle body part 2a and a lower nozzle body part 2b in the area of the variable narrowest nozzle cross section. Between them, a fuel air gap 11 is formed, which opens into the nozzle 10 via a circumferential gap opening, whereby fuel mixed with air is injected from the gap opening approximately into the direction of the main air mass flow L into the nozzle 10.
  • the lower nozzle body part 2b is provided with a fuel feed bore 13 which merges into a fuel ring channel 14 arranged in the nozzle body part 2b in a rotationally symmetrical manner with respect to the longitudinal axis 1 and which opens into the fuel air gap 11 via a fuel gap 15 connected to it.
  • Air is supplied via at least one Bore 16 in the upper nozzle body part 2a, which opens into an air ring channel 17 which is likewise arranged rotationally symmetrically with respect to the longitudinal axis 1 and which is connected to the fuel air gap 11.
  • the throttle body 7 is guided via a guide tube 18 arranged concentrically to the longitudinal axis 1, which is fixedly connected to a housing part 34 receiving the nozzle body 2, which is located below the throttle body 7 and the openings 6 for the main air mass flow L and is part of the housing of the mixture formation device forms.
  • the housing part 34 is provided with a bore arranged concentrically to the longitudinal axis 1, into which the guide tube 18 is pressed.
  • the conically tapering half of the throttle body 7 is provided with a corresponding bore 19 which passes through the guide tube 18 such that the throttle body 7 can be displaced on the guide tube 18 between the two positions shown in FIG.
  • the throttle body 7, starting from the bore 19, has a central bore into which a flexible rod 20 is inserted and soldered to the throttle body 7.
  • the end of the rod 20 facing away from the tip 8 of the throttle body 7 is connected in an articulated manner to a lever 21 which is pivotably mounted below the outlet opening of the guide tube 8 at a distance from the longitudinal axis 1 in the housing part 34.
  • the reference numbers 22 and 23 denote the fastening points of the rod and lever or lever and lower part of the nozzle body.
  • the described design of the device thus enables an axial displacement of the throttle body 7 on the guide tube 18 by means of the rod 20 which is fixedly connected to the throttle body 7 and is actuated by the lever 21 by means of a force, not shown.
  • the lever 21 describes the attachment point 22 of the rod 20 an arc around the attachment point 23 of the lever, whereby the attachment point 22 of the rod is shifted not only in the axial but also in the radial direction, the rod 20 following this movement because of its flexible property.
  • the position of the attachment point 23 of the lever 21 is selected with respect to the attachment point 22 of the rod 20 so that the total radial displacement x of the attachment point 22 is divided into two equal path lengths ⁇ x, based on the rod attachment on the throttle body 7.
  • the radial forces introduced into the guide of the throttle body 7 can thus be kept small.
  • the housing part 34 has a flange element 24 concentric to the longitudinal axis 1 at a distance from the guide tube 18 and covers the cylindrical shoulder 9 on the inside in each operating position of the throttle body 7.
  • One end of a rolling diaphragm 25 is clamped between the flange element 24 and the housing part 34, the other end of which is fixed between the cylindrical extension 9 and a clamp ring 26 surrounding it.
  • the sealing of the lower, open end of the throttle body 7 by means of the rolling diaphragm 25 serves, in cooperation with a bore 28, which is introduced into the conical region of the throttle body 7 and opens into the interior 27 of the throttle body 7, to relieve the pressure of the throttle body 7 at the variable due to the negative pressure in System induced closing forces.
  • FIG. 2 shows an embodiment of the mixture formation device based on the same principle of the invention, but in which instead of a rod 20 a metal band 20a is provided which, as shown in FIG. 1, passes through the guide tube 18 and is connected to the tip 8 of the throttle body 7.
  • the metal band 20a is guided at a right angle around a roller 31 mounted on an axis of rotation 30 and it engages on the end of the metal band 20a facing away from the throttle body 7 a lever end 32 of a lever 33 mounted in the housing part 34.
  • the position of the lever 33 for the closed throttle body is shown in FIG. 2, in which the longitudinal axis of the lever 33 is located in the extension of the assigned area of the metal strip 20a. Due to the kinematic conditions of lever 33 and metal strip 20a, there is a progressive movement of the metal strip in the x direction when the lever is deflected in the ⁇ direction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP19900106340 1989-09-08 1990-04-03 Dispositif pour le mélange du carburant et de l'air dans les moteurs à combustion interne Withdrawn EP0416200A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929841 1989-09-08
DE19893929841 DE3929841A1 (de) 1989-09-08 1989-09-08 Kraftstoff-luft-gemischbildungsvorrichtung fuer verbrennungsmotoren

Publications (1)

Publication Number Publication Date
EP0416200A2 true EP0416200A2 (fr) 1991-03-13

Family

ID=6388884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900106340 Withdrawn EP0416200A2 (fr) 1989-09-08 1990-04-03 Dispositif pour le mélange du carburant et de l'air dans les moteurs à combustion interne

Country Status (5)

Country Link
EP (1) EP0416200A2 (fr)
JP (1) JPH03100360A (fr)
AU (1) AU5683590A (fr)
BR (1) BR9004450A (fr)
DE (1) DE3929841A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9318951U1 (de) * 1993-11-30 1994-02-17 Kabisch, Herbert, 51377 Leverkusen Vorrichtung zur Herstellung von Gemischen aus Gasen und Flüssigkeiten, insbesondere von Luft und Brenn- und Kraftstoffen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60192846A (ja) * 1984-03-15 1985-10-01 Nissan Motor Co Ltd 内燃機関の燃料供給装置
JPS6327542A (ja) * 1986-07-22 1988-02-05 Kawaguchi Kagaku Kogyo Kk ゴム組成物

Also Published As

Publication number Publication date
JPH03100360A (ja) 1991-04-25
AU5683590A (en) 1991-03-14
BR9004450A (pt) 1991-09-10
DE3929841A1 (de) 1991-03-14

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