EP0768462A1 - Kreisringförmiger Diffusor für Abgasrückführung für Brennkraftmaschine - Google Patents

Kreisringförmiger Diffusor für Abgasrückführung für Brennkraftmaschine Download PDF

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Publication number
EP0768462A1
EP0768462A1 EP96402149A EP96402149A EP0768462A1 EP 0768462 A1 EP0768462 A1 EP 0768462A1 EP 96402149 A EP96402149 A EP 96402149A EP 96402149 A EP96402149 A EP 96402149A EP 0768462 A1 EP0768462 A1 EP 0768462A1
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EP
European Patent Office
Prior art keywords
annular
spacer
downstream
wall
inlet
Prior art date
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Granted
Application number
EP96402149A
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English (en)
French (fr)
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EP0768462B1 (de
Inventor
Michael Pontoppidan
Pierre Semence
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.)
Volkswagen AG
Marelli France SAS
Original Assignee
Magneti Marelli France SAS
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Application filed by Magneti Marelli France SAS filed Critical Magneti Marelli France SAS
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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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10144—Connections of intake ducts to each other or to another device
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0872—Details of the fuel vapour pipes or conduits
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/18—Thermal insulation or heat protection
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/31—Air-cooled heat exchangers
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers

Definitions

  • the invention relates to an annular diffuser for recycling carburetted gases, for an internal combustion engine, and relates more particularly, although not exclusively, to such an annular diffuser for an air supply device, which can be partially carburetted, an internal combustion engine powered by injection, as used in particular in the automotive field.
  • the annular diffuser of the invention is intended to recycle into the air stream sucked in by the engine, for burning in the latter, carburetted gases such as exhaust gases containing unburnt hydrocarbons, hydrocarbon vapors or loaded with hydrocarbons, collected in a canister and coming from the purge of the latter, or even vapors loaded with polluting combustible products such as oil pan purge vapors.
  • Devices for reinjecting carburetted vapors are already known downstream of a body with an adjustable air intake flap, called a throttle body, supplying an internal combustion engine with air via an intake manifold on which the throttle body is mounted.
  • These known devices generally comprise at least one auxiliary injection tube, inserted radially at the junction between the outlet of the throttle body, and the inlet of the intake manifold.
  • This injection tube opens out substantially at the level of the central axis of symmetry of the outlet of the throttle body.
  • the downstream end of this tube is bent parallel to the axis of the outlet of the throttle body and in the upstream direction, that is to say in the direction opposite to the direction of circulation of the air drawn in by the engine.
  • a disadvantage of this type of device lies in a significant pressure drop created by the master torque of the auxiliary injection tube. Turbulence can be added to it, which further increases the resulting pressure drop.
  • the auxiliary tube is brought to a high temperature, and there may be a problem of thermal compatibility with parts contiguous to the re-injection device, such as the intake manifold or the butterfly body, in particular if one of them is made of a synthetic material, for example thermoplastic. Means must then be provided for cooling the auxiliary injection tube and / or thermally insulating the other parts in contact with the latter.
  • reinjection devices of annular structure having, on their internal periphery, an injection point, or several injection points generally equally spaced in circumferential direction, for example two diametrically opposite injection points , on an intermediate part arranged between the downstream part of the throttle body and the upstream part of the intake manifold.
  • the main drawback of this type of device lies in the fact that the gas mixture stream, at the inlet of the manifold, is not uniformly distributed over the periphery of this inlet, and may lack homogeneity, hence this results in an unbalanced supply of the different cylinders of the engine.
  • an intake circuit for a multi-cylinder internal combustion engine working with recycling of exhaust gases and in particular for an injection engine with an air compressor, said circuit being equipped with an air ducting casing which comprises an intermediate wall forming a partition and which constitutes, on one side, a wall limiting the purified air chamber, and, on the other side, parts of wall which respectively limit a channel of mixing chamber and a distribution chamber adjacent to this channel, this chamber being connected to the mixing channel by passages formed in the wall of the mixing channel and having connection points for intake tubes of the internal combustion engine, and a adjustable air intake flap being arranged in the wall part which limits the mixing channel, in the middle of the intermediate wall, the intake of exhaust gases being provided downstream of the air intake flap, concentrically with this flap, and the passages formed in the wall of the mixing channel being curved in a semicircle and arranged symmetrically with respect to the position of the air intake flap.
  • the part of the intermediate wall which limits the mixing channel and which is of substantially planar shape, takes, in the region of the adjustable air intake flap, the form of a tube constituting the articulation range of the adjustable flap .
  • This tubing forms, in combination with a covering element fixed to the intermediate wall, an annular exhaust gas channel connected to the exhaust gas pipe, and the tubing is surrounded by the covering element so that an annular slot for the passage of exhaust gases is formed at the end on the outlet side of the tube.
  • Such an intake circuit incorporates an annular diffuser for recycling exhaust gases, which comprises an annular channel, supplied with exhaust gas to be recycled, and formed between two members delimiting between them an annular slot for the passage of exhaust gases. exhaust to be recycled, this slot being substantially coaxial at the outlet of the tubing, acting as a throttle body, and the slot opening downstream of the annular channel and the outlet of the tubing, in order to diffuse the exhaust gases to recycle in the air stream leaving this tubing.
  • the annular diffuser thus obtained is not compatible with the throttle bodies and the intake manifolds which are usually used in the vast majority of systems for supplying fuel by injection of an internal combustion engine.
  • the annular diffuser that includes the intake circuit of FR-A-2 582 353 cannot therefore be retrofitted on known engines.
  • the throttle body is of a particular type, for example with a motorized throttle valve, and / or the intake manifold is also of a particular type, for example adjustable for adjusting the acoustic impedance of the engine.
  • the problem underlying the invention is to keep the advantages provided by an annular diffuser for recycling carburetted gases such as that contained in the intake circuit according to the aforementioned document, while remedying at least one of the disadvantages presented above.
  • An object of the invention is therefore to propose an annular diffuser of simple, economical structure, ensuring good homogeneity of the gas mixture at the inlet of the manifold without creating a significant pressure drop, and which can be retrofitted on engines. known and / or in combination with most types of throttle body and intake manifold, on new generation engines.
  • the annular recycling diffuser for carburetted gases for internal combustion engine supplied with air by an intake manifold on which a throttle body is mounted, and of the type known by FR-A-2 582 353, comprising an annular channel, supplied with gas to be recycled, and formed between two members delimiting between them an annular slot for the passage of the gases to be recycled, said slot being substantially coaxial with the outlet of said throttle body and opening downstream of the annular channel and said outlet of the throttle body, so to diffuse the gases to be recycled in the air stream leaving said throttle body, is characterized in that the members are two spacers arranged between the outlet of the throttle body and the inlet of the manifold, and substantially coaxial around the axis of symmetry common to said outlet and inlet, at least one inlet for supplying the annular channel with gas to be recycled being formed at least partially in at least one of the spacers, one of which is a spacer e upstream, adjacent to the outlet of the throttle body, and comprising a tubular and substantially
  • annular diffuser according to the invention can be mounted in a joint between the outlet of a throttle body and the inlet of an intake manifold, without significant interference with the structure of these last.
  • the upstream spacer also comprises a substantially radial annular blank, integral of the tubular internal wall of the upstream spacer, so that this annular blank can form the upstream wall (relative to the direction of flow of the air) of the annular channel of recycled gases.
  • the upstream spacer in the form of an insert on the butterfly body, or on the contrary in one piece with this body, and therefore in the same material, metallic or synthetic, as the latter.
  • the annular blank of the upstream spacer is fixed, with the interposition of at least one annular seal, against a substantially radial downstream face of the butterfly body, around the outlet of this body .
  • the upstream spacer is attached to the throttle body or in one piece with the latter, it may, as a variant, also comprise an external peripheral wall, tubular and substantially axial, preferably integral, by its upstream axial end, with the annular blank of the upstream spacer, said external wall of the upstream spacer being fixed, with the interposition of at least one annular seal, against the annular blank of the downstream spacer.
  • downstream spacer which also comprises an external peripheral wall, tubular and substantially axial, integral, preferably by its downstream axial end, with the annular blank of the downstream spacer, and against which the upstream spacer is fixed, preferably by its annular blank, with the interposition of at least one annular seal.
  • the downstream spacer can, similarly, be either in one piece, metallic or made of a synthetic material, with the collector intake, is reported on the latter, in which case it is advantageous that the downstream spacer is fixed, by its annular blank and / or by its external wall, if necessary, and with the interposition of at least one annular seal, against a substantially radial upstream face of the manifold, around the inlet of said intake manifold.
  • the upstream spacer When the upstream spacer is an insert which cooperates with a downstream spacer provided with the external peripheral wall, the upstream spacer can be produced, in a simple and economical manner, by cutting and stamping a piece of sheet metal, in which case it is advantageous that two annular seals, for example made of elastomer and preferably coaxial, each having the shape of a half torus, are each overmolded on one respectively of the faces of the annular blank of the upstream spacer which are turned 1 'one towards the body with adjustable shutter and the other towards the external wall of the downstream spacer. This makes the sealing of the annular channel outwards in good conditions.
  • two annular seals for example made of elastomer and preferably coaxial, each having the shape of a half torus
  • the spacers When the gases to be recycled are at a high temperature, as is the case with the exhaust gases, the spacers must be made of a material compatible with this temperature, that is to say generally of metal or metal alloy. In this case, it is advantageous for the external peripheral wall to have cooling fins projecting outwards from the metal spacer which comprises it.
  • this external peripheral wall is further crossed by at least one substantially radial supply inlet, for example for fuel vapors coming from a canister, and / or at least one substantially tangential supply inlet, for example for exhaust gases, for supplying the annular channel with gas to be recycled.
  • the entire annular diffuser with the throttle body and the intake manifold is made up of four, three or two pieces, it is advantageous that the diffuser is assembled and fixed between the outlet of the body throttle valve and the inlet of the manifold by bolts for fixing said throttle body to an inlet base of said manifold, such bolts being conventionally provided on assembly and fixing lugs for the throttle body on the inlet base of the collector.
  • the dimensional characteristics and the shapes of the trailing edges of the parts of the two spacers which delimit the annular slot are determined so as to disturb at least the flow of air in the inlet channel of the manifold d 'admission.
  • the axial downstream end of the internal tubular wall of the upstream spacer may be shaped as a substantially frustoconical lip converging downstream or at a bevel, inclined from the external radial face towards the internal radial face of said low wall, to delimit a slot, preferably axial, of section substantially convergent downstream, the differences in radius and / or the axial distances between the internal edges of the spacers which delimit the annular slot, and, where appropriate, the angle of inclination of the frustoconical lip being chosen to optimize the depression of the call by avoiding the formation of noise.
  • the width of the slot is such that it makes it possible to avoid the generation of harmful acoustic noise and has a hydraulic im
  • a butterfly body is partially represented at 1, the circular outlet 2 of which has an axis of symmetry XX, is surrounded by a radial flange or flange 3 for fixing the body 1, by axial bolts 4, on a radial base 7 surrounding the circular inlet 6, coaxial with the outlet 2 around the axis XX, of a manifold body 5 of air intake for an injection engine.
  • An annular diffuser 8 is mounted as a joint between the outlet flange 3 of the body 1 and the manifold inlet 7 of the manifold 5, for diffusing, into the air stream drawn from the outlet 2 of the body 1 at the inlet 6 of the manifold 5 for supplying the engine with recycled fuel gases such as exhaust gases and hydrocarbon vapors.
  • the diffuser 8 essentially consists of two annular spacers coaxial around the axis XX and one of which is an upstream spacer 9, adjacent to the outlet flange 3 of the body 1, and the other a downstream spacer 10, adjacent to the input base 7 of the manifold 5.
  • the spacers 9 and 10 are assembled and fixed one against the other and between the flange 3 and the base 7 by the bolts 4 passing through opposite holes made in these elements.
  • the upstream spacer 9 essentially comprises a radial annular blank 11 and an internal wall 12, tubular and axial, which is integral by its upstream axial end (towards the flange 3) of the internal radial edge of the blank 11, which is applied and fixed, with the interposition of a coaxial annular seal 13, against the radial downstream face of the flange 3 of the body 1 around its outlet 2
  • the downstream axial end of the tubular wall 12 is shaped as a frustoconical lip 14 converging downstream with an angle of inclination ⁇ , and the aim of which is to locally increase the motor depression, thanks to the turbulence generated downstream of this lip 14 thus oriented towards the axis of symmetry XX.
  • Such a spacer 9 can be shaped by stamping a sheet.
  • the downstream spacer 10 essentially consists of a radial annular blank 15, coaxial with the inlet 6 of the manifold 5, and an external peripheral wall 16 tubular and axial, of a radial thickness much greater than that of the wall 12 of the spacer 9, and integral, by its downstream axial end, with the external radial periphery of the annular blank 15.
  • the spacer 10 is applied, by the radial upstream face of its wall 16 and with the interposition of a gasket annular seal 17, similar to the seal 13, against the downstream face of the annular blank 11 of the spacer 9, and, by the radial downstream faces, in the extension of one another, of its wall 16 and its blank annular 15, with interposition of an annular seal 18, against the upstream radial face of the base 7 of the inlet of the manifold 5.
  • the spacers 9 and 10 are thus arranged relative to each other that they delimit between them an annular channel 19 and an annular slot 20 putting the channel 19 in communication with the air stream circulating between the outlet 2 of the body 1 and the inlet 6 of the manifold 5.
  • the channel 19 is supplied with carburetted gases to be recycled by at least one inlet conduit 21 passing through the external peripheral wall 16 in a substantially radial direction, but which can also be substantially tangential with respect to to the annular channel 19.
  • the annular slot 20 is delimited between the internal radial edge of the annular blank 15 of the spacer 10, downstream, and, upstream, the lip 14 of the tubular wall 12, the internal radial face of which delimits a cylindrical conduit which coaxially extends the outlet 2 of the body 1, while its outer radial face forms the inner radial wall of the annular channel 19.
  • the adjustment of the flow section of the slot 20 is done by the choice of the distance between the trailing edge downstream of the lip 14 and the edge closest to the annular blank 15 of the spacer 9.
  • the axial orientation of the slot 20 results from the fact that the internal radial edge of the blank 15 is substantially in the extension of the cylindrical conduit formed by the tubular wall 12.
  • the internal radial edge of the blank 15 can be offset radially outward relative to the tubular wall 12 to give the slot 20 an essentially radial orientation.
  • the two spacers 9 and 10 are metallic, for example made of aluminum or aluminum alloy, while the body 1 and the manifold 5 are made of a synthetic material, but could also be metallic, especially if the channel 19 is supplied with carburetted gases at high temperature, such as exhaust gas. On the other hand, if the channel 19 is only supplied with hydrocarbon vapors at ambient temperature, the spacers 9 and 10 as well as the body 1 and the manifold 5 can each be made of a synthetic material.
  • FIG. 1B differs from that of FIG. 1A only by the production of the upstream spacer 9 ', which is in one metal piece with the outlet flange 3' of the butterfly body 1 '.
  • the spacer 9 ' also has a tubular wall 12', the downstream axial end of which is in the form of a bevel 14 'inclined from the external radial face towards the internal radial face of the wall 12' and from upstream to downstream according to the axis XX defines the slot 20, but the annular blank of this spacer 9 'is integrated into the flange 3' directly adjacent to the annular channel 19 and separated from the external wall 16 of the downstream spacer 10 by a seal annular 17 '.
  • the value of the pressure drop across the annular slot 20 is determined by the radial and axial distances between the two edges of the slot 20, the diameter of the trailing edge of the bevel 14 'of the upstream spacer 9' cannot be greater than the internal diameter of the downstream spacer 10.
  • the downstream spacer 10' is also of a single metal part with 5 'manifold.
  • the spacer 10 ' is integrated by its annular blank into the base 7' of the manifold 5 ', and its external wall 16' is crossed by the supply inlet 21 'of the annular channel 19 in gas to be recycled, and is applied against the flange 3 'of the body 1' by the annular seal 17 ', the shapes and arrangements of the channel 19 and of the slot 20 remaining unchanged.
  • FIG. 1D comprises an upstream spacer 9 associated with the flange 3 of the body 1 as in FIG. 1A, but cooperating with a downstream spacer 10 'in a single metal piece with the manifold 5', as in FIG. 1C , with the only difference that the annular seal 17 'of FIGS. 1B and 1C is replaced by the seal 17 of FIG. 1A, on the downstream face of the annular blank 11 of the upstream spacer 9, of the other side of annular seal 13 on the upstream face of this same blank 11, to ensure the seal between the latter and the flange 3.
  • the external peripheral wall 16 "does not belong to the downstream spacer 10", but to the upstream spacer 9 ".
  • This wall 16 tubular and axial, is secured by its axial end upstream of the external radial periphery of the radial annular blank 11 "of the upstream spacer 9", this annular blank 11 "being, as in FIGS. 1A and 1D, secured by its internal radial edge to the axial end upstream of the tubular wall internal 12 "of this same upstream spacer 9".
  • This upstream spacer 9 is applied by its external wall 16", and with the interposition of an annular seal 17 ", against the radial annular blank 15" of the spacer downstream 10 ", which may be in one piece with the manifold 5", as in FIGS. 1C and 1D, or attached against the manifold with the interposition of an annular seal, such as the seal 18 in the figures 1A and 1B.
  • Figures 2 to 4 show a first example of a downstream spacer 30 for an annular diffuser seal such as 8 in Figure 1A.
  • the annular blank 35 is extended axially by a tubular endpiece 37 with a central passage diverging downstream by a rounded wall thinning, which can be fitted or otherwise connected in the inlet of the intake manifold.
  • the external wall 36 is surrounded by a collar 38 which supports four sleeves 39 for the passage of the fixing bolts.
  • the wall 38 is crossed by a radial supply inlet 41 for the reinjection of fuel vapors recovered in a canister and delivered to the inlet 41 by a flow control valve (not shown).
  • the wall 36 is also crossed by a tangential supply inlet 42 (see FIG. 2) for the reinjection, for example of engine exhaust gas, by means of another valve for controlling the debit (also not shown).
  • a tangential supply inlet 42 for the reinjection, for example of engine exhaust gas, by means of another valve for controlling the debit (also not shown).
  • this tangential supply inlet 42 is surrounded by a flange 43 for connection to an exhaust gas recirculation pipe.
  • Figures 5 and 6 show an upstream metal spacer 29, produced by cutting and stamping a sheet metal part, and intended to cooperate with the downstream spacer 30 of Figures 2 to 4 to form an annular diffuser seal such as 8 on the Figure 1A.
  • the upstream spacer 29 has a substantially square planar shape with rounded tops and has, around its thin central tubular wall 32, an annular blank 31 on the two opposite faces from which are molded, in opposition, two annular elastomer seals 33 and 34 each having the shape of a half torus, and which are coaxial and of the same radius, and correspond to the seals 13 and 17 of FIG. 1A.
  • the seal 33 is thus on the face of the annular blank 31 which is applied against the throttle body, and the seal 34 on the face applied against the external wall 36 of the downstream spacer 30 of Figures 2 to 4.
  • Radially outside seals 33 and 34, the blank 31 has four passages 40 (for the fixing bolts), which come opposite the sleeves 39 of the downstream spacer 30, in which is engaged the central wall 32 of the spacer 29, mounted on the spacer 30 to define with it the annular channel and slot.
  • FIG. 7 represents a second example of a downstream spacer 30 ′, which differs essentially from the spacer 30 of FIGS. 2 to 4 by the fact that its external peripheral wall 36 ′ has fins projecting laterally outwards cooling 44 'which extend axially to an external flange 38', of substantially square plan shape with rounded apices at the level of which sleeves 39 'are provided for passing bolts.
  • This spacer 30 ' provided for the reinjection of hot exhaust gases, is metallic, and its wall 36' is crossed by a radial inlet 41 'for supplying hydrocarbon vapors and by a tangential inlet 42 'for supplying exhaust gas, by a recirculation pipe to which the spacer 30' is connected by the flange 43 '.
  • the spacer 30 ' may comprise, under its collar 38', a tubular end piece 37 'for connection to the inlet of the collector.
  • the throttle body 1 and / or the inlet base 7 of the manifold 5 may or may be made of metal or of a synthetic material, for example thermoplastic.
  • the realization of one and / or the other of the spacers in one piece with the throttle body and / or the intake manifold can only be done if the two elements to be combined in one piece can be made of the same material, metallic or synthetic. If the gases to be recycled are at a high temperature, the spacers at least must be made of a material compatible with this temperature, that is to say generally of metal. Consequently, each of them can only be in one piece with an outlet flange of the throttle body or respectively a manifold inlet base which is made of metal.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP96402149A 1995-10-13 1996-10-10 Kreisringförmiger Diffusor für Abgasrückführung für Brennkraftmaschine Expired - Lifetime EP0768462B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9512040A FR2739897B1 (fr) 1995-10-13 1995-10-13 Diffuseur annulaire de recyclage de gaz carbures, pour moteur a combustion interne
FR9512040 1995-10-13

Publications (2)

Publication Number Publication Date
EP0768462A1 true EP0768462A1 (de) 1997-04-16
EP0768462B1 EP0768462B1 (de) 2002-01-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402149A Expired - Lifetime EP0768462B1 (de) 1995-10-13 1996-10-10 Kreisringförmiger Diffusor für Abgasrückführung für Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP0768462B1 (de)
DE (1) DE69618309T2 (de)
ES (1) ES2170842T3 (de)
FR (1) FR2739897B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19809862A1 (de) * 1998-03-07 1999-09-09 Mann & Hummel Filter Vorrichtung zur Rückführung von Abgasen bei einem Verbrennungsmotor
WO2001079680A1 (de) * 2000-04-17 2001-10-25 Robert Bosch Gmbh Vorrichtung zur mischung und dosierung von gasströmen an verbrennungskraftmaschinen
WO2015055270A1 (de) * 2013-10-15 2015-04-23 Motorenfabrik Hatz Gmbh & Co. Kg Mischvorrichtung für die abgasrückführung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014201935A1 (de) * 2014-02-04 2015-08-20 Mahle International Gmbh Anordnung zur Abgasrückführung

Citations (4)

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Publication number Priority date Publication date Assignee Title
GB2060765A (en) * 1979-08-24 1981-05-07 Chester R A Adding fluids in fuel-air mixture intake passages
US4345574A (en) * 1979-03-27 1982-08-24 Tadakatsu Iwami Secondary air feeder for an internal combustion engine
DE3413419A1 (de) * 1983-04-11 1984-10-11 August, Paul, Dipl.-Ing. Dr.h.c., Barcelona Vorrichtung zum einleiten von zusaetzlichen gasstroemen in den ansaugkanal einer gemischverdichtenden brennkraftmaschine
DE3511094A1 (de) * 1985-03-27 1986-10-09 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Vorrichtung zum zufuehren eines zusatzgasstroms in den ansaugkanal eines ottomotors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345574A (en) * 1979-03-27 1982-08-24 Tadakatsu Iwami Secondary air feeder for an internal combustion engine
GB2060765A (en) * 1979-08-24 1981-05-07 Chester R A Adding fluids in fuel-air mixture intake passages
DE3413419A1 (de) * 1983-04-11 1984-10-11 August, Paul, Dipl.-Ing. Dr.h.c., Barcelona Vorrichtung zum einleiten von zusaetzlichen gasstroemen in den ansaugkanal einer gemischverdichtenden brennkraftmaschine
DE3511094A1 (de) * 1985-03-27 1986-10-09 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Vorrichtung zum zufuehren eines zusatzgasstroms in den ansaugkanal eines ottomotors

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19809862A1 (de) * 1998-03-07 1999-09-09 Mann & Hummel Filter Vorrichtung zur Rückführung von Abgasen bei einem Verbrennungsmotor
WO1999045263A1 (de) * 1998-03-07 1999-09-10 Filterwerk Mann+Hummel Gmbh Vorrichtung zur rückführung von abgasen bei einem verbrennungsmotor
WO2001079680A1 (de) * 2000-04-17 2001-10-25 Robert Bosch Gmbh Vorrichtung zur mischung und dosierung von gasströmen an verbrennungskraftmaschinen
WO2015055270A1 (de) * 2013-10-15 2015-04-23 Motorenfabrik Hatz Gmbh & Co. Kg Mischvorrichtung für die abgasrückführung

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FR2739897B1 (fr) 1997-12-12
EP0768462B1 (de) 2002-01-02
FR2739897A1 (fr) 1997-04-18
DE69618309T2 (de) 2002-08-22
DE69618309D1 (de) 2002-02-07

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