EP0768462B1 - Annular diffusor for exhaust gas recirculation for internal combustion engine - Google Patents

Annular diffusor for exhaust gas recirculation for internal combustion engine Download PDF

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Publication number
EP0768462B1
EP0768462B1 EP96402149A EP96402149A EP0768462B1 EP 0768462 B1 EP0768462 B1 EP 0768462B1 EP 96402149 A EP96402149 A EP 96402149A EP 96402149 A EP96402149 A EP 96402149A EP 0768462 B1 EP0768462 B1 EP 0768462B1
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EP
European Patent Office
Prior art keywords
annular
cross
downstream
wall
upstream
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
EP96402149A
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German (de)
French (fr)
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EP0768462A1 (en
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
Volkswagen AG
Magneti Marelli France SAS
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Application filed by Volkswagen AG, Magneti Marelli France SAS filed Critical Volkswagen AG
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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 of fuel gas recycling, for a combustion engine internal, and relates more particularly, although not exclusively, to such an annular diffuser for a device air supply, which can be partially fuel, from an internal combustion engine powered by injection, as used in particular in the automotive field.
  • the annular diffuser of the invention is intended for recycle in the air stream drawn by the engine, for burn in it, carburetted gases such as gases exhaust containing unburnt hydrocarbons, hydrocarbon vapors or hydrocarbon laden, collected in a canister and coming from the purge of this last, or vapors loaded with combustible products pollutants such as crankcase purge vapors oil.
  • carburetted gases such as gases exhaust containing unburnt hydrocarbons, hydrocarbon vapors or hydrocarbon laden, collected in a canister and coming from the purge of this last, or vapors loaded with combustible products pollutants such as crankcase purge vapors oil.
  • a disadvantage of this type of device lies in a significant pressure drop created by the master-couple of the auxiliary injection tube. It can be added turbulence, which further increases the pressure drop resultant.
  • the auxiliary tube is brought to a temperature high, and there may be a compatibility issue thermal with adjoining parts to the reinjection, such as the intake manifold or the butterfly body, especially if one of them is made of a synthetic material, for example thermoplastic. Means must then be provided to cool the auxiliary injection tube and / or thermally insulate other parts in contact with it.
  • ring structure reinjection devices having, on their internal periphery, an injection point, or several injection points, generally evenly distributed in circumferential direction, for example two diametrically opposite injection points on a part intermediate disposed between the downstream part of the body throttle valve and the upstream part of the intake manifold.
  • the main disadvantage of this type of device lies in the fact that the gas mixture vein, at the inlet of the collector, is not uniformly distributed over the periphery of this entry, and may lack homogeneity, which results in an unbalanced diet of different engine cylinders.
  • a circuit intake for a multi-cylinder internal combustion engine working with exhaust gas recycling, and particular for an air compressor injection engine said intake circuit being equipped with a housing air duct which includes an intermediate wall forming a partition and which constitutes, on one side, a wall limiting the purified air chamber, and, on the other side, wall parts which respectively limit a channel of mixture and a distribution chamber adjacent to this channel, this chamber being connected to the mixing channel by passages in the wall of the mixing channel and having connection points for tubes intake of the internal combustion engine, and a flap adjustable air intake being arranged in the part of wall which limits the mixing channel, in the middle of the wall intermediate, the exhaust gas intake being provided downstream of the air intake flap, concentrically to this flap, and the passages in the wall of the canal of mixture being curved in a semicircle and arranged symmetrically with respect to the position of the intake flap air.
  • the part of the intermediate wall which limits the mixing channel which is substantially planar in shape, takes, in the region of the adjustable air intake flap, the shape of a tube constituting the articulation span adjustable shutter.
  • This tubing forms, in combination with a covering element fixed to the intermediate wall, a annular exhaust gas channel connected to the exhaust gas, and the tubing is surrounded by the element covering so that an annular gap is formed exhaust gas passage, at the side end outlet from the tubing.
  • Such an intake circuit incorporates a diffuser exhaust gas recycling ring, which includes an annular channel, supplied with exhaust gas to be recycled, and formed between two organs delimiting between them a annular slot for the passage of exhaust gases 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 be recycled in the air stream exiting from this tubing.
  • a diffuser exhaust gas recycling ring which includes an annular channel, supplied with exhaust gas to be recycled, and formed between two organs delimiting between them a annular slot for the passage of exhaust gases 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 be recycled in the air stream exiting from this tubing.
  • annular diffuser arise precisely from its integration into a circuit complex structure intake, in which the wall intermediate between the air chamber, the mixing channel and the distribution chamber is arranged in tubing, making butterfly body function, and surrounded by the annular channel of the diffuser defined between this intermediate wall and a covering element.
  • the annular diffuser thus obtained is not compatible with throttle bodies and manifolds that are usually used in the very vast majority of power supply installations injection of internal combustion engine.
  • the annular diffuser that the circuit includes FR-A-2 582 353 cannot therefore be fitted in retrofitting on known engines.
  • the problem underlying the invention is to keep the advantages provided by an annular diffuser recycling of fuel gases such as that contained in the intake circuit according to the aforementioned document, while overcoming at least one of the disadvantages presented above.
  • An object of the invention is therefore to propose a annular diffuser of simple, economical structure, ensuring good homogeneity of the gas mixture at the inlet of the collector without creating a significant pressure drop, and which can be retrofitted on known engines and / or in combination with most body types throttle valve and intake manifold, on new generation.
  • the annular recycling diffuser for carburetted gases for combustion engine internal air supplied by an intake manifold on which is mounted a butterfly body, 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 bodies delimiting between them an annular slot for the passage of gases to be recycled, said slot being substantially coaxial at the outlet of said throttle body and opening downstream of the annular channel and said outlet of the throttle body, in order to diffuse the gases to recycle in the air stream leaving said butterfly body, is characterized in that the members are two spacers arranged between the outlet of the throttle body and the inlet of the collector, and substantially coaxial around the axis of symmetry common to said output and input, at least one gas inlet for the annular channel to be recycled being provided at least partially in at least one of the spacers, one of which is an upstream, adjacent spacer at the exit of the butterfly body, and comprising a low wall internal tubular and substantially axial, the face of which internal
  • the diffuser ring according to the invention can be mounted as a seal between the exit of a butterfly body and the entry of a intake manifold, without significant interference with the structure of these.
  • the upstream spacer comprises also a substantially radial annular blank, integral of the internal tubular wall of the upstream spacer, so that this annular blank can form the upstream wall (by air flow direction) of the annular channel of recycled gases.
  • the upstream spacer under the shape of a patch on the butterfly body, or contrary of a single 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 interposition of minus an annular seal, against a downstream face substantially radial from the throttle body, around the outlet of this body.
  • the upstream spacer is attached to the body butterfly or in one piece with the latter, it can, in variant, also include a peripheral wall external, tubular and substantially axial, preferably secured by its upstream axial end to the annular blank of the upstream spacer, said outer wall of the spacer upstream being fixed, with interposition of at least one joint sealing ring, against the annular blank of the spacer downstream.
  • downstream spacer which includes also an external peripheral wall, tubular and substantially axial, integral, preferably by its downstream axial end of the annular blank of the spacer downstream, and against which the upstream spacer is fixed, preferably by its annular blank, with interposition of minus an annular seal.
  • the downstream spacer can, similarly, be either one piece, metallic or a synthetic material, with the collector of admission, be reported on the latter, in which case it it is advantageous that the downstream spacer is fixed, by its annular blank and / or its external wall, if applicable, and with the interposition of at least one seal annular, against a substantially radial upstream face of the collector, around the inlet of said intake manifold.
  • the upstream spacer When the upstream spacer is an added part which cooperates with a downstream spacer provided with the peripheral wall external, the upstream spacer can be made, simple and economical way, by cutting and stamping of a piece of sheet metal, in which case it is advantageous that two annular seals, for example made of elastomer and preferably coaxial, each in the shape of a half torus, are each overmolded on one of the faces of the annular blank of the upstream spacer which are facing one towards the body with adjustable shutter and the other towards the external wall of the downstream spacer. We thus realize under good conditions the sealing of the annular channel outwards.
  • two annular seals for example made of elastomer and preferably coaxial, each in the shape of a half torus
  • spacers When gases to be recycled are at a temperature high, as is the case with exhaust gases, spacers must be made of a compatible material with this temperature, that is to say generally made of metal or metallic alloy. In this case, it is advantageous that the external peripheral wall has cooling fins protruding outward from the spacer metallic that understands it.
  • this external peripheral wall is additionally crossed by at least one power input substantially radial, for example for vapors fuel from a canister, and / or at least one substantially tangential feed input, for example for exhaust gases, for channel supply gas ring to recycle.
  • the whole annular diffuser with the body throttle valve 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 butterfly and the manifold inlet by bolts fixing of said throttle body on an input base of said manifold, such bolts being conventionally provided on assembly and fixing lugs of the throttle body on the manifold input base.
  • the characteristics dimensional and shapes of the trailing edges of the parts of the two spacers which delimit the annular slot are determined so as to disturb the flow to a minimum air in the intake manifold inlet channel.
  • the axial end downstream of the internal tubular wall of the upstream spacer either shaped like a substantially frustoconical lip converging towards downstream or bevel, inclined from the outer radial face towards the internal radial face of said low wall, to delimit a slot, preferably axial, of substantially cross section converging downstream, the radius differences and / or the axial distances between the inner edges of the spacers which delimit the annular slot, and, where appropriate, the angle of inclination of the frustoconical lip being chosen to optimize call depression by avoiding training noise.
  • the width of the slot is such that it avoids the generation of harmful acoustic noise and has a hydraulic impedance compatible with the fuel air flow to be ensured taking into account the vacuum driving.
  • a throttle body including the circular outlet 2, with an axis of symmetry X-X, is surrounded by a leg or radial flange 3 of fixing of the body 1, by axial bolts 4, on a radial base 7 surrounding the circular inlet 6, coaxial at outlet 2 around the X-X axis, a manifold body 5 air intake for an injection engine.
  • An annular diffuser 8 is mounted in joint between the body outlet flange 3 and the inlet base 7 of the manifold 5, to diffuse, into the air stream aspirated from the outlet 2 of the body 1 at the inlet 6 of the manifold 5 for engine power, recycled fuel gases such as exhaust gases and hydrocarbon vapors.
  • the diffuser 8 consists essentially of two annular spacers coaxial around the X-X axis and one of which is a 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.
  • 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 interposition of a seal 13 coaxial annular, against the downstream radial face of the flange 3 of the body 1 around its outlet 2.
  • the end axial downstream of the tubular wall 12 is shaped as a lip 14 frustoconical converging downstream with an angle of inclination ⁇ , and whose goal is to locally increase the motor depression, thanks to turbulence generated downstream of this lip 14 thus oriented towards the axis of symmetry X-X.
  • Such a spacer 9 can be shaped by stamping of a sheet.
  • the downstream spacer 10 is essentially made up a radial annular blank 15, coaxial with the inlet 6 of the collector 5, and a tubular external peripheral wall 16 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, from the outer radial periphery of the annular blank 15.
  • the spacer 10 is applied, by the radial face upstream of its low wall 16 and with interposition an annular seal 17, similar to seal 13, against the downstream face of the annular blank 11 of the spacer 9, and, by the downstream radial faces, in the extension one on the other, its wall 16 and its annular blank 15, with the interposition of an annular seal 18, against the upstream radial face of the inlet base 7 of the collector 5.
  • the spacers 9 and 10 are thus arranged one with respect to the other that they delimit between them a annular channel 19 and an annular slot 20 putting the channel 19 in communication with the circulating air stream between outlet 2 of body 1 and inlet 6 of manifold 5.
  • Channel 19 is supplied with fuel gas to be recycled by at minus one inlet duct 21 passing through the peripheral wall external 16 in a substantially radial direction, but can also be substantially tangential by relative to the annular channel 19.
  • the annular slot 20 is delimited between the internal radial edge of the annular blank 15 from 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 body 1, while its external radial face forms the internal 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 downstream trailing edge 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 duct formed by the tubular wall 12.
  • the internal radial edge of the blank 15 may be offset radially outward from the tubular wall 12 to give the slot 20 an orientation essentially radial.
  • the two spacers 9 and 10 are metallic, for example aluminum or aluminum alloy, while body 1 and manifold 5 are made of synthetic material, but could also be metallic, especially if channel 19 is supplied with gas high temperature fuels, such as exhaust gas.
  • the spacers 9 and 10 as well as the body 1 and the collector 5 can each be made of synthetic material.
  • FIG. 1B The variant of Figure 1B is not distinguished from that of FIG. 1A only by making the upstream spacer 9 ', which is a single metal piece with the flange outlet 3 'of the butterfly body 1'.
  • the 9 'spacer presents also a tubular wall 12 ', the axial end of which downstream, shaped as a bevel 14 'inclined from the radial face external to the internal radial face of the wall 12 'and upstream downstream along the X-X axis, delimits 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 annular seal 17 '.
  • the value of the loss of load through 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 diameter downstream spacer 10.
  • FIG. 1C there is a upstream spacer 9 'in a single metal part with the flange 3 'of body outlet 1', but, in addition, the spacer downstream 10 'is also made of a single metal part with the 5 'collector.
  • the 10 'spacer is integrated by its blank annular to the base 7 'of the collector 5', and its wall external 16 'is crossed by the power input 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 the slot 20 remaining unchanged.
  • FIG. 1D comprises a spacer upstream 9 associated with the flange 3 of the body 1 as in the figure 1A, but cooperating with a 10 'downstream spacer of a single metal part with the 5 'collector, as in the figure 1C, with the only difference that the seal ring 17 'of FIGS. 1B and 1C is replaced by the seal seal 17 of FIG. 1A, on the downstream face of the blank annular 11 of the upstream spacer 9, on the other side of the annular seal 13 on the upstream face of this same blank 11, to seal between the latter and the flange 3.
  • the peripheral wall external 16 does not belong to the downstream spacer 10", but at the upstream spacer 9 ".
  • This 16" wall, tubular and axial, is integral by its axial end upstream of the external radial periphery of the 11 "radial annular blank of the upstream spacer 9 ", this annular blank 11" being, as in FIGS. 1A and 1D, secured by its radial edge internal of the upstream axial end 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 a 17 “annular seal, against the 15 "radial annular blank of the downstream spacer 10 ", which can be in one piece with the 5" manifold, as in FIGS. 1C and 1D, or reported against the manifold with interposition of a seal annular, such as the seal 18 in Figures 1A and 1B.
  • Figures 2 to 4 show a first example downstream spacer 30 for an annular diffuser seal such as as 8 in Figure 1A.
  • the annular blank 35 is extended axially by a tubular end piece 37 with a central passage diverging towards downstream by a rounded wall thinning, which can to be fitted or otherwise connected in the inlet of the intake manifold.
  • the external wall 36 is surrounded by a flange 38 which supports four sleeves 39 for fixing bolts.
  • the low wall 38 is crossed by a radial supply inlet 41 for reinjection fuel vapor recovered in a canister and delivered to input 41 by a flow control valve (not shown).
  • the low wall 36 is also crossed by a tangential supply input 42 (see Figure 2) for the reinjection, for example of exhaust gases from the engine, via another control valve debit (also not shown).
  • a tangential feed inlet 42 is surrounded by a flange 43 for connection to a recirculation line for exhaust gas.
  • Figures 5 and 6 show an upstream spacer 29 metallic, 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 in Figure 1A.
  • the upstream spacer 29 a a substantially square plan shape with rounded tops and presents, around its thin central tubular wall 32, a annular blank 31 on the two opposite faces of which are overmolded, 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 joints 13 and 17 of Figure 1A.
  • the seal 33 is thus on the face of the annular blank 31 which is applied against the body butterfly, and the seal 34 on the face applied against the external wall 36 of the downstream spacer 30 of FIGS. 2 to 4.
  • the blank 31 Radially outside the 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.
  • Figure 7 shows a second example of a spacer downstream 30 ', which essentially differs from the spacer 30 of Figures 2 to 4 by the fact that its low wall external device 36 'present, projecting laterally outwards, 44 'cooling fins which extend axially to an external flange 38 ', of substantially square plan shape with rounded tops level which are provided with sleeves 39 'for passage of bolts.
  • This 30 'spacer provided for the reinjection of hot exhaust gas, is metallic, and its wall 36 ' is crossed by a radial inlet 41 'for supplying hydrocarbon vapors and through a tangential inlet 42 ' exhaust gas supply, via a recirculation to which the spacer 30 'is connected by the flange 43 '.
  • the spacer 30 ' may include, under its collar 38', a tubular end piece 37 'for connection to the inlet of the manifold.
  • the throttle body 1 and / or the inlet base 7 of the manifold 5 can or can be made of metal or a material synthetic, for example in thermoplastic.
  • the realization of one and / or the other one-piece spacers with the throttle body and / or the intake manifold not can only be done if the two elements to combine from one single piece can be made of the same material, metallic or synthetic. If there are gases to be recycled high temperature, at least the spacers must be a material compatible with this temperature, i.e. usually made of metal. Consequently, each of them does not can be in one piece only with an outlet flange throttle body or respectively an input base of the collector 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)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Description

L'invention concerne un diffuseur annulaire de recyclage de gaz carburés, pour un moteur à combustion interne, et se rapporte plus particulièrement, bien que non exclusivement, à un tel diffuseur annulaire pour un dispositif d'alimentation en air, pouvant être partiellement carburé, d'un moteur à combustion interne alimenté par injection, tel qu'utilisé notamment dans le domaine automobile.The invention relates to an annular diffuser of fuel gas recycling, for a combustion engine internal, and relates more particularly, although not exclusively, to such an annular diffuser for a device air supply, which can be partially fuel, from an internal combustion engine powered by injection, as used in particular in the automotive field.

Le diffuseur annulaire de l'invention est destiné à recycler dans la veine d'air aspirée par le moteur, pour les brûler dans ce dernier, des gaz carburés tels que des gaz d'échappement contenant des hydrocarbures imbrûlés, des vapeurs d'hydrocarbure ou chargées d'hydrocarbures, collectées dans un canister et provenant de la purge de ce dernier, ou encore des vapeurs chargées de produits combustibles polluants telles que vapeurs de purge de carter d'huile.The annular diffuser of the invention is intended for recycle in the air stream drawn by the engine, for burn in it, carburetted gases such as gases exhaust containing unburnt hydrocarbons, hydrocarbon vapors or hydrocarbon laden, collected in a canister and coming from the purge of this last, or vapors loaded with combustible products pollutants such as crankcase purge vapors oil.

On connait déjà des dispositifs de réinjection de vapeurs carburées en aval d'un corps à volet réglable d'admission d'air, appelé, corps papillon, alimentant un moteur à combustion interne en air par l'intermédiaire d'un collecteur d'admission sur lequel le corps papillon est monté. (voir DE-A-3 413 419) Ces dispositifs connus comprennent généralement au moins un tube d'injection auxiliaire, inséré radialement au niveau de la jonction entre la sortie du corps papillon, et l'entrée du collecteur d'admission. Ce tube d'injection débouche sensiblement au niveau de l'axe central de symétrie de la sortie du corps papillon. Dans certaines applications, l'extrémité aval de ce tube est coudée parallèlement à l'axe de la sortie du corps papillon et en direction amont, c'est-à-dire en sens opposé au sens de circulation de l'air aspiré par le moteur.We already know reinjection devices carburetted vapors downstream of an adjustable shutter body air intake, called, throttle body, supplying a internal combustion engine in air via a intake manifold on which the throttle body is mounted. (see DE-A-3 413 419) These known devices generally include at minus an auxiliary injection tube, inserted radially at the level of the junction between the outlet of the throttle body, and the inlet of the intake manifold. This injection tube opens substantially at the level of the central axis of symmetry from the throttle body outlet. In some applications, the downstream end of this tube is bent parallel to the axis from the throttle body outlet and in an upstream direction, i.e. in the opposite direction to the direction of circulation of the aspirated air by the engine.

Un inconvénient de ce type de dispositif réside dans une perte de charge importante créée par le maítre-couple du tube d'injection auxiliaire. Il peut s'y ajouter des turbulences, qui accroissent encore la perte de charge résultante. En outre, en cas de réinjection de gaz d'échappement, le tube auxiliaire est porté à une température élevée, et il peut se poser un problème de compatibilité thermique avec des pièces contiguës au dispositif de réinjection, telles que le collecteur d'admission ou le corps papillon, en particulier si l'un d'entre eux est réalisé en une matière de synthèse, par exemple thermoplastique. Des moyens doivent alors être prévus pour refroidir le tube d'injection auxiliaire et/ou isoler thermiquement les autres pièces en contact avec ce dernier.A disadvantage of this type of device lies in a significant pressure drop created by the master-couple of the auxiliary injection tube. It can be added turbulence, which further increases the pressure drop resultant. In addition, in the event of exhaust gas re-injection, the auxiliary tube is brought to a temperature high, and there may be a compatibility issue thermal with adjoining parts to the reinjection, such as the intake manifold or the butterfly body, especially if one of them is made of a synthetic material, for example thermoplastic. Means must then be provided to cool the auxiliary injection tube and / or thermally insulate other parts in contact with it.

Pour recycler des gaz carburés, on connait également des dispositifs de réinjection de structure annulaire présentant, sur leur périphérie interne, un point d'injection, ou plusieurs points d'injection généralement équi-répartis en direction circonférentielle, par exemple deux points d'injection diamétralement opposés, sur une pièce intermédiaire disposée entre la partie aval du corps papillon et la partie amont du collecteur d'admission.To recycle fuel gases, we also know ring structure reinjection devices having, on their internal periphery, an injection point, or several injection points, generally evenly distributed in circumferential direction, for example two diametrically opposite injection points on a part intermediate disposed between the downstream part of the body throttle valve and the upstream part of the intake manifold.

L'inconvénient principal de ce type de dispositif réside dans le fait que la veine de mélange gazeux, à l'entrée du collecteur, n'est pas uniformément répartie sur la périphérie de cette entrée, et peut manquer d'homogénéité, d'où il résulte une alimentation déséquilibrée des différents cylindres du moteur.The main disadvantage of this type of device lies in the fact that the gas mixture vein, at the inlet of the collector, is not uniformly distributed over the periphery of this entry, and may lack homogeneity, which results in an unbalanced diet of different engine cylinders.

On connaít également, par FR-A-2 582 353, un circuit d'admission pour un moteur à combustion interne multicylindre travaillant avec recyclage des gaz d'échappement, et en particulier pour un moteur à injection à compresseur d'air, ledit circuit d'admission étant équipé d'un carter de canalisation d'air qui comprend une paroi intermédiaire formant cloison et qui constitue, d'un côté, une paroi limitant la chambre à air épurée, et, de l'autre côté, des parties de paroi qui limitent respectivement un canal de mélange et une chambre de distribution adjacente à ce canal, cette chambre étant reliée au canal de mélange par des passages ménagés dans la paroi du canal de mélange et présentant des points de raccordement pour des tubes d'admission du moteur à combustion interne, et un volet réglable d'admission d'air étant agencé dans la partie de paroi qui limite le canal de mélange, au milieu de la paroi intermédiaire, l'admission des gaz d'échappement étant prévue en aval du volet d'admission d'air, concentriquement à ce volet, et les passages ménagés dans la paroi du canal de mélange étant incurvés en arc-de-cercle et disposés symétriquement par rapport à la position du volet d'admission d'air. La partie de paroi intermédiaire, qui limite le canal de mélange et qui est de forme sensiblement plane, prend, dans la région du volet réglable d'admission d'air, la forme d'une tubulure constituant la portée d'articulation du volet réglable. Cette tubulure forme, en combinaison avec un élément de recouvrement fixé à la paroi intermédiaire, un canal annulaire de gaz d'échappement relié à la conduite de gaz d'échappement, et la tubulure est entourée par l'élément de recouvrement de manière qu'il se forme une fente annulaire de passage des gaz d'échappement, à l'extrémité côté sortie de la tubulure.We also know, by FR-A-2 582 353, a circuit intake for a multi-cylinder internal combustion engine working with exhaust gas recycling, and particular for an air compressor injection engine, said intake circuit being equipped with a housing air duct which includes an intermediate wall forming a partition and which constitutes, on one side, a wall limiting the purified air chamber, and, on the other side, wall parts which respectively limit a channel of mixture and a distribution chamber adjacent to this channel, this chamber being connected to the mixing channel by passages in the wall of the mixing channel and having connection points for tubes intake of the internal combustion engine, and a flap adjustable air intake being arranged in the part of wall which limits the mixing channel, in the middle of the wall intermediate, the exhaust gas intake being provided downstream of the air intake flap, concentrically to this flap, and the passages in the wall of the canal of mixture being curved in a semicircle and arranged symmetrically with respect to the position of the intake flap air. The part of the intermediate wall, which limits the mixing channel which is substantially planar in shape, takes, in the region of the adjustable air intake flap, the shape of a tube constituting the articulation span adjustable shutter. This tubing forms, in combination with a covering element fixed to the intermediate wall, a annular exhaust gas channel connected to the exhaust gas, and the tubing is surrounded by the element covering so that an annular gap is formed exhaust gas passage, at the side end outlet from the tubing.

Un tel circuit d'admission intègre un diffuseur annulaire de recyclage des gaz d'échappement, qui comprend un canal annulaire, alimenté en gaz d'échappement à recycler, et formé entre deux organes délimitant entre eux une fente annulaire de passage des gaz d'échappement à recycler, cette fente étant sensiblement coaxiale à la sortie de la tubulure, faisant fonction de corps papillon, et la fente s'ouvrant en aval du canal annulaire et de la sortie de la tubulure, afin de diffuser les gaz d'échappement à recycler dans la veine d'air sortant de cette tubulure.Such an intake circuit incorporates a diffuser exhaust gas recycling ring, which includes an annular channel, supplied with exhaust gas to be recycled, and formed between two organs delimiting between them a annular slot for the passage of exhaust gases 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 be recycled in the air stream exiting from this tubing.

Les inconvénients d'un tel diffuseur annulaire découlent précisément de son intégration dans un circuit d'admission de structure complexe, dans laquelle la paroi intermédiaire entre la chambre à air, le canal de mélange et la chambre de distribution est aménagée en tubulure, faisant fonction de corps papillon, et entourée du canal annulaire du diffuseur délimité entre cette paroi intermédiaire et un élément de recouvrement.The disadvantages of such an annular diffuser arise precisely from its integration into a circuit complex structure intake, in which the wall intermediate between the air chamber, the mixing channel and the distribution chamber is arranged in tubing, making butterfly body function, and surrounded by the annular channel of the diffuser defined between this intermediate wall and a covering element.

Le diffuseur annulaire ainsi obtenu n'est pas compatible avec les corps papillon et les collecteurs d'admission qui sont habituellement utilisés dans la très grande majorité des installations d'alimentation par injection de moteur à combustion interne.The annular diffuser thus obtained is not compatible with throttle bodies and manifolds that are usually used in the very vast majority of power supply installations injection of internal combustion engine.

Le diffuseur annulaire que comprend le circuit d'admission de FR-A-2 582 353 ne peut donc pas être monté en rattrapage sur des moteurs connus. De plus, en raison de sa structure particulière, intégrée à celle du circuit d'admission décrit dans le document précité, il ne peut pas non plus équiper de nouveaux moteurs sur lesquels l'encombrement du diffuseur de recyclage des gaz carburés est limité, et/ou le corps papillon est d'un type particulier, par exemple à papillon motorisé, et/ou le collecteur d'admission est également d'un type particulier, par exemple modulable pour le réglage de l'impédance acoustique du moteur.The annular diffuser that the circuit includes FR-A-2 582 353 cannot therefore be fitted in retrofitting on known engines. In addition, due to its special structure, integrated with that of the intake circuit described in the aforementioned document, it also cannot plus equip new engines on which the bulk of the fuel gas recycling diffuser is limited, and / or the butterfly body is of a particular type, for example at motorized throttle valve, and / or the intake manifold is also of a particular type, for example modular for adjusting the acoustic impedance of the motor.

Le problème à la base de l'invention est de conserver les avantages procurés par un diffuseur annulaire de recyclage de gaz carburés tel que celui contenu dans le circuit d'admission selon le document précité, tout en remédiant à l'un au moins des inconvénients présentés ci-dessus.The problem underlying the invention is to keep the advantages provided by an annular diffuser recycling of fuel gases such as that contained in the intake circuit according to the aforementioned document, while overcoming at least one of the disadvantages presented above.

Un but de l'invention est donc de proposer un diffuseur annulaire de structure simple, économique, assurant une bonne homogénéité du mélange gazeux à l'entrée du collecteur sans créer de perte de charge importante, et qui puisse se monter en rattrapage sur des moteurs connus et/ou en combinaison avec la plupart des types de corps papillon et de collecteur d'admission, sur des moteurs de nouvelle génération.An object of the invention is therefore to propose a annular diffuser of simple, economical structure, ensuring good homogeneity of the gas mixture at the inlet of the collector without creating a significant pressure drop, and which can be retrofitted on known engines and / or in combination with most body types throttle valve and intake manifold, on new generation.

A cet effet, le diffuseur annulaire de recyclage de gaz carburés selon l'invention, pour moteur à combustion interne alimenté en air par un collecteur d'admission sur lequel est monté un corps papillon, et du type connu par FR-A-2 582 353, comprenant un canal annulaire, alimenté en gaz à recycler, et formé entre deux organes délimitant entre eux une fente annulaire de passage des gaz à recycler, ladite fente étant sensiblement coaxiale à la sortie dudit corps papillon et s'ouvrant en aval du canal annulaire et de ladite sortie du corps papillon, afin de diffuser les gaz à recycler dans la veine d'air sortant dudit corps papillon, se caractérise en ce que les organes sont deux entretoises disposées entre la sortie du corps papillon et l'entrée du collecteur, et sensiblement coaxiales autour de l'axe de symétrie commun auxdites sortie et entrée, au moins une entrée d'alimentation du canal annulaire en gaz à recycler étant ménagée au moins partiellement dans l'une au moins des entretoises, dont l'une est une entretoise amont, adjacente à la sortie du corps papillon, et comportant un muret interne tubulaire et sensiblement axial, dont la face radiale interne délimite un conduit cylindrique prolongeant sensiblement coaxialement la sortie du corps papillon, et dont la face radiale externe forme la paroi radiale interne du canal annulaire, l'autre entretoise étant une entretoise aval, adjacente à l'entrée du collecteur, et comportant un flan annulaire sensiblement radial et sensiblement coaxial à l'entrée du collecteur, la fente annulaire étant délimitée entre l'extrémité axiale aval dudit muret tubulaire de l'entretoise amont et le bord radial interne dudit flan annulaire de l'entretoise aval.To this end, the annular recycling diffuser for carburetted gases according to the invention, for combustion engine internal air supplied by an intake manifold on which is mounted a butterfly body, 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 bodies delimiting between them an annular slot for the passage of gases to be recycled, said slot being substantially coaxial at the outlet of said throttle body and opening downstream of the annular channel and said outlet of the throttle body, in order to diffuse the gases to recycle in the air stream leaving said butterfly body, is characterized in that the members are two spacers arranged between the outlet of the throttle body and the inlet of the collector, and substantially coaxial around the axis of symmetry common to said output and input, at least one gas inlet for the annular channel to be recycled being provided at least partially in at least one of the spacers, one of which is an upstream, adjacent spacer at the exit of the butterfly body, and comprising a low wall internal tubular and substantially axial, the face of which internal radial delimits a cylindrical conduit extending substantially coaxially the output of the throttle body, and whose outer radial face forms the inner radial wall of the annular channel, the other spacer being a spacer downstream, adjacent to the inlet of the collector, and comprising a substantially radial and substantially coaxial annular blank at the inlet of the collector, the annular slot being delimited between the downstream axial end of said tubular wall of the upstream spacer and the internal radial edge of said blank ring of the downstream spacer.

L'avantage d'une telle structure est que le diffuseur annulaire selon l'invention peut se monter en joint entre la sortie d'un corps papillon et l'entrée d'un collecteur d'admission, sans interférence significative avec la structure de ces derniers.The advantage of such a structure is that the diffuser ring according to the invention can be mounted as a seal between the exit of a butterfly body and the entry of a intake manifold, without significant interference with the structure of these.

Avantageusement, l'entretoise amont comprend également un flan annulaire sensiblement radial, solidaire du muret interne tubulaire de l'entretoise amont, de sorte que ce flan annulaire peut former la paroi amont (par rapport au sens d'écoulement de l'air) du canal annulaire de gaz recyclés.Advantageously, the upstream spacer comprises also a substantially radial annular blank, integral of the internal tubular wall of the upstream spacer, so that this annular blank can form the upstream wall (by air flow direction) of the annular channel of recycled gases.

Il est possible de réaliser l'entretoise amont sous la forme d'une pièce rapportée sur le corps papillon, ou au contraire d'une seule pièce avec ce corps, et donc dans le même matériau, métallique ou de synthèse, que ce dernier. Dans le premier cas, il est avantageux que le flan annulaire de l'entretoise amont soit fixé, avec interposition d'au moins un joint d'étanchéité annulaire, contre une face aval sensiblement radiale du corps papillon, autour de la sortie de ce corps.It is possible to make the upstream spacer under the shape of a patch on the butterfly body, or contrary of a single piece with this body, and therefore in the same material, metallic or synthetic, as the latter. In the first case, it is advantageous that the annular blank of the upstream spacer is fixed, with interposition of minus an annular seal, against a downstream face substantially radial from the throttle body, around the outlet of this body.

Que l'entretoise amont soit rapportée sur le corps papillon ou d'une seule pièce avec ce dernier, elle peut, en variante, comprendre également un muret périphérique externe, tubulaire et sensiblement axial, de préférence solidaire, par son extrémité axiale amont, du flan annulaire de l'entretoise amont, ledit muret externe de l'entretoise amont étant fixé, avec interposition d'au moins un joint d'étanchéité annulaire, contre le flan annulaire de l'entretoise aval.That the upstream spacer is attached to the body butterfly or in one piece with the latter, it can, in variant, also include a peripheral wall external, tubular and substantially axial, preferably secured by its upstream axial end to the annular blank of the upstream spacer, said outer wall of the spacer upstream being fixed, with interposition of at least one joint sealing ring, against the annular blank of the spacer downstream.

Mais il est également possible, selon une autre variante, que ce soit l'entretoise aval qui comprenne également un muret périphérique externe, tubulaire et sensiblement axial, solidaire, de préférence par son extrémité axiale aval, du flan annulaire de l'entretoise aval, et contre lequel l'entretoise amont est fixée, de préférence par son flan annulaire, avec interposition d'au moins un joint d'étanchéité annulaire.But it is also possible, according to another variant, whether it is the downstream spacer which includes also an external peripheral wall, tubular and substantially axial, integral, preferably by its downstream axial end of the annular blank of the spacer downstream, and against which the upstream spacer is fixed, preferably by its annular blank, with interposition of minus an annular seal.

Que l'entretoise amont soit rapportée sur ou d'une seule pièce avec le corps papillon, l'entretoise aval peut, de manière similaire, être soit d'une seule pièce, métallique ou en un matériau de synthèse, avec le collecteur d'admission, soit rapportée sur ce dernier, auquel cas il est avantageux que l'entretoise aval soit fixée, par son flan annulaire et/ou par son muret externe, le cas échéant, et avec interposition d'au moins un joint d'étanchéité annulaire, contre une face amont sensiblement radiale du collecteur, autour de l'entrée dudit collecteur d'admission.Whether the upstream spacer is attached to or from a single piece with the throttle body, the downstream spacer can, similarly, be either one piece, metallic or a synthetic material, with the collector of admission, be reported on the latter, in which case it it is advantageous that the downstream spacer is fixed, by its annular blank and / or its external wall, if applicable, and with the interposition of at least one seal annular, against a substantially radial upstream face of the collector, around the inlet of said intake manifold.

Lorsque l'entretoise amont est une pièce rapportée qui coopère avec une entretoise aval munie du muret périphérique externe, l'entretoise amont peut être réalisée, de manière simple et économique, par découpe et emboutissage d'une pièce de tôle, auquel cas il est avantageux que deux joints d'étanchéité annulaires, par exemple en élastomère et de préférence coaxiaux, ayant chacun la forme d'un demi tore, soient surmoulés chacun sur l'une respectivement des faces du flan annulaire de l'entretoise amont qui sont tournées l'une vers le corps à volet réglable et l'autre vers le muret externe de l'entretoise aval. On réalise ainsi dans de bonnes conditions l'étanchéité du canal annulaire vers l'extérieur.When the upstream spacer is an added part which cooperates with a downstream spacer provided with the peripheral wall external, the upstream spacer can be made, simple and economical way, by cutting and stamping of a piece of sheet metal, in which case it is advantageous that two annular seals, for example made of elastomer and preferably coaxial, each in the shape of a half torus, are each overmolded on one of the faces of the annular blank of the upstream spacer which are facing one towards the body with adjustable shutter and the other towards the external wall of the downstream spacer. We thus realize under good conditions the sealing of the annular channel outwards.

Lorsque des gaz à recycler sont à une température élevée, comme c'est le cas des gaz d'échappement, les entretoises doivent être réalisées en un matériau compatible avec cette température, c'est-à-dire généralement en métal ou alliage métallique. Dans ce cas, il est avantageux que le muret périphérique externe présente des ailettes de refroidissement en saillie vers l'extérieur de l'entretoise métallique qui le comprend.When gases to be recycled are at a temperature high, as is the case with exhaust gases, spacers must be made of a compatible material with this temperature, that is to say generally made of metal or metallic alloy. In this case, it is advantageous that the external peripheral wall has cooling fins protruding outward from the spacer metallic that understands it.

Avantageusement, ce muret périphérique externe est de plus traversé par au moins une entrée d'alimentation sensiblement radiale, par exemple pour les vapeurs de combustible provenant d'un canister, et/ou au moins une entrée d'alimentation sensiblement tangentielle, par exemple pour les gaz d'échappement, pour l'alimentation du canal annulaire en gaz à recycler.Advantageously, this external peripheral wall is additionally crossed by at least one power input substantially radial, for example for vapors fuel from a canister, and / or at least one substantially tangential feed input, for example for exhaust gases, for channel supply gas ring to recycle.

Que l'ensemble du diffuseur annulaire avec le corps papillon et le collecteur d'admission soit constitué en quatre, trois ou deux pièces, il est avantageux que le diffuseur soit assemblé et fixé entre la sortie du corps papillon et l'entrée du collecteur par des boulons de fixation dudit corps papillon sur une embase d'entrée dudit collecteur, de tels boulons étant classiquement prévus sur des pattes d'assemblage et de fixation du corps papillon sur l'embase d'entrée du collecteur.Let the whole annular diffuser with the body throttle valve 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 butterfly and the manifold inlet by bolts fixing of said throttle body on an input base of said manifold, such bolts being conventionally provided on assembly and fixing lugs of the throttle body on the manifold input base.

Enfin, de manière générale, les caractéristiques dimensionnelles et les formes des bords de fuite des parties des deux entretoises qui délimitent la fente annulaire sont déterminées de manière à perturber au minimum l'écoulement de l'air dans le canal d'entrée du collecteur d'admission. A cet effet, il peut être avantageux que l'extrémité axiale aval du muret tubulaire interne de l'entretoise amont soit conformée en lèvre sensiblement tronconique convergeant vers l'aval ou en biseau, incliné de la face radiale externe vers la face radiale interne dudit muret, pour délimiter une fente, de préférence axiale, de section sensiblement convergente vers l'aval, les différences de rayon et/ou les distances axiales entre les bords internes des entretoises qui délimitent la fente annulaire, et, le cas échéant, l'angle d'inclinaison de la lèvre tronconique étant choisis pour optimiser la dépression d'appel en évitant la formation de bruit. Ainsi, la largeur de la fente est telle qu'elle permet d'éviter la génération de bruit acoustique nuisible et présente une impédance hydraulique compatible avec le débit d'air carburé à assurer compte-tenu de la dépression motrice.Finally, in general, the characteristics dimensional and shapes of the trailing edges of the parts of the two spacers which delimit the annular slot are determined so as to disturb the flow to a minimum air in the intake manifold inlet channel. For this purpose, it may be advantageous for the axial end downstream of the internal tubular wall of the upstream spacer either shaped like a substantially frustoconical lip converging towards downstream or bevel, inclined from the outer radial face towards the internal radial face of said low wall, to delimit a slot, preferably axial, of substantially cross section converging downstream, the radius differences and / or the axial distances between the inner edges of the spacers which delimit the annular slot, and, where appropriate, the angle of inclination of the frustoconical lip being chosen to optimize call depression by avoiding training noise. So the width of the slot is such that it avoids the generation of harmful acoustic noise and has a hydraulic impedance compatible with the fuel air flow to be ensured taking into account the vacuum driving.

D'autres avantages et caractéristiques de l'invention ressortiront de la description donnée ci-dessous, à titre non limitatif, d'exemples de réalisation décrits en référence aux dessins annexés sur lesquels :

  • les figures 1A à 1E sont des coupes axiales schématiques de cinq variantes de réalisation du diffuseur annulaire,
  • la figure 2 est une vue schématique en plan d'un premier exemple d'entretoise aval pour un joint diffuseur annulaire du type de la variante de la figure 1A,
  • les figures 3 et 4 sont des coupes respectivement selon III-III et IV-IV de la figure 2,
  • la figure 5 est une vue schématique en plan d'un exemple d'entretoise amont pouvant coopérer avec l'entretoise aval selon les figures 2 à 4 pour former un joint diffuseur annulaire du type de la figure 1A,
  • la figure 6 est une vue en coupe selon VI-VI de la figure 5, et
  • la figure 7 est une vue schématique en perspective d'un second exemple préféré d'entretoise aval, pour un joint diffuseur annulaire du type de la figure 1A.
Other advantages and characteristics of the invention will emerge from the description given below, without implied limitation, of embodiments described with reference to the appended drawings in which:
  • FIGS. 1A to 1E are schematic axial sections of five alternative embodiments of the annular diffuser,
  • FIG. 2 is a schematic plan view of a first example of a downstream spacer for an annular diffuser seal of the type of the variant of FIG. 1A,
  • FIGS. 3 and 4 are sections respectively along III-III and IV-IV of FIG. 2,
  • FIG. 5 is a schematic plan view of an example of an upstream spacer capable of cooperating with the downstream spacer according to FIGS. 2 to 4 to form an annular diffuser seal of the type of FIG. 1A,
  • FIG. 6 is a sectional view along VI-VI of FIG. 5, and
  • Figure 7 is a schematic perspective view of a second preferred example of a downstream spacer for an annular diffuser seal of the type of Figure 1A.

Sur la figure 1A, on a représenté partiellement en 1 un corps papillon, dont la sortie circulaire 2, d'axe de symétrie X-X, est entourée d'une patte ou bride radiale 3 de fixation du corps 1, par des boulons axiaux 4, sur une embase radiale 7 entourant l'entrée circulaire 6, coaxiale à la sortie 2 autour de l'axe X-X, d'un corps de collecteur 5 d'admission d'air pour un moteur à injection.In FIG. 1A, part is shown in 1 a throttle body, including the circular outlet 2, with an axis of symmetry X-X, is surrounded by a leg or radial flange 3 of fixing of the body 1, by axial bolts 4, on a radial base 7 surrounding the circular inlet 6, coaxial at outlet 2 around the X-X axis, a manifold body 5 air intake for an injection engine.

Un diffuseur annulaire 8 est monté en joint entre la bride 3 de sortie du corps 1 et l'embase 7 d'entrée du collecteur 5, pour diffuser, dans la veine d'air aspirée de la sortie 2 du corps 1 à l'entrée 6 du collecteur 5 pour l'alimentation du moteur, des gaz carburés recyclés tels que gaz d'échappement et vapeurs d'hydrocarbures. Le diffuseur 8 est essentiellement constitué de deux entretoises annulaires coaxiales autour de l'axe X-X et dont l'une est une entretoise amont 9, adjacente à la bride de sortie 3 du corps 1, et l'autre une entretoise aval 10, adjacente à l'embase d'entrée 7 du collecteur 5.An annular diffuser 8 is mounted in joint between the body outlet flange 3 and the inlet base 7 of the manifold 5, to diffuse, into the air stream aspirated from the outlet 2 of the body 1 at the inlet 6 of the manifold 5 for engine power, recycled fuel gases such as exhaust gases and hydrocarbon vapors. The diffuser 8 consists essentially of two annular spacers coaxial around the X-X axis and one of which is a 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.

Les entretoises 9 et 10 sont assemblées et fixées l'une contre l'autre et entre la bride 3 et l'embase 7 par les boulons 4 traversant des trous en regard ménagés dans ces éléments.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.

L'entretoise amont 9 comprend essentiellement un flan annulaire radial 11 et un muret interne 12, tubulaire et axial, qui est solidaire par son extrémité axiale amont (vers la bride 3) du bord radial interne du flan 11, lequel est appliqué et fixé, avec interposition d'un joint d'étanchéité 13 annulaire coaxial, contre la face radiale aval de la bride 3 du corps 1 autour de sa sortie 2. L'extrémité axiale aval du muret tubulaire 12 est conformée en lèvre 14 tronconique convergeant vers l'aval avec un angle d'inclinaison α, et dont le but est d'accroítre localement la dépression motrice, grâce aux turbulences générées en aval de cette lèvre 14 ainsi orientée vers l'axe de symétrie X-X. Une telle entretoise 9 peut être conformée par emboutissage d'une tôle.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 interposition of a seal 13 coaxial annular, against the downstream radial face of the flange 3 of the body 1 around its outlet 2. The end axial downstream of the tubular wall 12 is shaped as a lip 14 frustoconical converging downstream with an angle of inclination α, and whose goal is to locally increase the motor depression, thanks to turbulence generated downstream of this lip 14 thus oriented towards the axis of symmetry X-X. Such a spacer 9 can be shaped by stamping of a sheet.

L'entretoise aval 10 est essentiellement constituée d'un flan annulaire radial 15, coaxial à l'entrée 6 du collecteur 5, et d'un muret périphérique externe 16 tubulaire et axial, d'une épaisseur radiale bien supérieure à celle du muret 12 de l'entretoise 9, et solidaire, par son extrémité axiale aval, de la périphérie radiale externe du flan annulaire 15. L'entretoise 10 est appliquée, par la face radiale amont de son muret 16 et avec interposition d'un joint d'étanchéité annulaire 17, analogue au joint 13, contre la face aval du flan annulaire 11 de l'entretoise 9, et, par les faces radiales aval, dans le prolongement l'une de l'autre, de son muret 16 et de son flan annulaire 15, avec interposition d'un joint d'étanchéité annulaire 18, contre la face radiale amont de l'embase 7 d'entrée du collecteur 5.The downstream spacer 10 is essentially made up a radial annular blank 15, coaxial with the inlet 6 of the collector 5, and a tubular external peripheral wall 16 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, from the outer radial periphery of the annular blank 15. The spacer 10 is applied, by the radial face upstream of its low wall 16 and with interposition an annular seal 17, similar to seal 13, against the downstream face of the annular blank 11 of the spacer 9, and, by the downstream radial faces, in the extension one on the other, its wall 16 and its annular blank 15, with the interposition of an annular seal 18, against the upstream radial face of the inlet base 7 of the collector 5.

Les entretoises 9 et 10 sont ainsi disposées l'une par rapport à l'autre qu'elles délimitent entre elles un canal annulaire 19 et une fente annulaire 20 mettant le canal 19 en communication avec la veine d'air circulant entre la sortie 2 du corps 1 et l'entrée 6 du collecteur 5. Le canal 19 est alimenté en gaz carburés à recycler par au moins un conduit d'entrée 21 traversant le muret périphérique externe 16 selon une direction sensiblement radiale, mais pouvant également être sensiblement tangentielle par rapport au canal annulaire 19. La fente annulaire 20 est délimitée entre le bord radial interne du flan annulaire 15 de l'entretoise 10, vers l'aval, et, vers l'amont, la lèvre 14 du muret tubulaire 12, dont la face radiale interne délimite un conduit cylindrique qui prolonge coaxialement la sortie 2 du corps 1, tandis que sa face radiale externe forme la paroi radiale interne du canal annulaire 19. Le réglage de la section débitante de la fente 20 se fait par le choix de la distance comprise entre le bord de fuite aval de la lèvre 14 et le bord le plus proche du flan annulaire 15 de l'entretoise 9. La fente annulaire 20, coaxiale à la sortie 2 du corps 1 et à l'entrée 6 du collecteur 5, s'ouvre en aval du canal annulaire 19 et de la sortie 2 du corps 1, et permet le passage des gaz à recycler du canal 19 vers la veine d'air circulant entre la sortie 2 et l'entrée 6, et dans laquelle les gaz recyclés sont diffusés de manière homogène, en augmentant la dépression locale motrice vers l'aval, notamment en raison de la forme convergente vers l'aval de la fente 20, qui, dans cet exemple, est une fente essentiellement axiale. L'orientation axiale de la fente 20 résulte de ce que le bord radial interne du flan 15 est sensiblement dans le prolongement du conduit cylindrique formé par le muret tubulaire 12.The spacers 9 and 10 are thus arranged one with respect to the other that they delimit between them a annular channel 19 and an annular slot 20 putting the channel 19 in communication with the circulating air stream between outlet 2 of body 1 and inlet 6 of manifold 5. Channel 19 is supplied with fuel gas to be recycled by at minus one inlet duct 21 passing through the peripheral wall external 16 in a substantially radial direction, but can also be substantially tangential by relative to the annular channel 19. The annular slot 20 is delimited between the internal radial edge of the annular blank 15 from 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 body 1, while its external radial face forms the internal 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 downstream trailing edge lip 14 and the edge closest to the annular blank 15 of the spacer 9. The annular slot 20, coaxial with the outlet 2 of body 1 and at inlet 6 of manifold 5, opens downstream of the annular channel 19 and of the outlet 2 of the body 1, and allows the passage of gases to be recycled from channel 19 to the air flow circulating between outlet 2 and inlet 6, and in which the recycled gases are diffused so homogeneous, increasing local motor depression towards downstream, in particular due to the converging form towards downstream of slot 20, which in this example is a slot essentially axial. 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 duct formed by the tubular wall 12.

En variante, le bord radial interne du flan 15 peut être décalé radialement vers l'extérieur par rapport au muret tubulaire 12 pour donner à la fente 20 une orientation essentiellement radiale.Alternatively, the internal radial edge of the blank 15 may be offset radially outward from the tubular wall 12 to give the slot 20 an orientation essentially radial.

Dans l'exemple de la figure 1A, les deux entretoises 9 et 10 sont métalliques, par exemple en aluminium ou alliage d'aluminium, alors que le corps 1 et le collecteur 5 sont en un matériau de synthèse, mais pourraient également être métalliques, surtout si le canal 19 est alimenté en gaz carburés à température élevée, tels que gaz d'échappement. Par contre, si le canal 19 est uniquement alimenté en vapeurs d'hydrocarbures à température ambiante, les entretoises 9 et 10 ainsi que le corps 1 et le collecteur 5 peuvent chacun être en un matériau de synthèse. In the example of FIG. 1A, the two spacers 9 and 10 are metallic, for example aluminum or aluminum alloy, while body 1 and manifold 5 are made of synthetic material, but could also be metallic, especially if channel 19 is supplied with gas high temperature fuels, such as exhaust gas. On the other hand, if channel 19 is only supplied with hydrocarbon vapors at room temperature, the spacers 9 and 10 as well as the body 1 and the collector 5 can each be made of synthetic material.

La variante de la figure 1B ne se distingue de celle de la figure 1A que par la réalisation de l'entretoise amont 9', qui est d'une seule pièce métallique avec la bride de sortie 3' du corps papillon 1'. L'entretoise 9' présente également un muret tubulaire 12', dont l'extémité axiale aval, conformée en biseau 14' incliné de la face radiale externe vers la face radiale interne du muret 12' et de l'amont vers l'aval selon l'axe X-X, délimite la fente 20, mais le flan annulaire de cette entretoise 9' est intégré à la bride 3' directement adjacente au canal annulaire 19 et séparé du muret externe 16 de l'entretoise aval 10 par un joint d'étanchéité annulaire 17'. La valeur de la perte de charge à travers la fente annulaire 20 est déterminée par les distances radiales et axiales entre les deux bords de la fente 20, le diamètre du bord de fuite du biseau 14' de l'entretoise amont 9' ne pouvant être supérieur au diamètre interne de l'entretoise aval 10.The variant of Figure 1B is not distinguished from that of FIG. 1A only by making the upstream spacer 9 ', which is a single metal piece with the flange outlet 3 'of the butterfly body 1'. The 9 'spacer presents also a tubular wall 12 ', the axial end of which downstream, shaped as a bevel 14 'inclined from the radial face external to the internal radial face of the wall 12 'and upstream downstream along the X-X axis, delimits 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 annular seal 17 '. The value of the loss of load through 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 diameter downstream spacer 10.

Dans la variante de la figure 1C, on retrouve une entretoise amont 9' d'une seule pièce métallique avec la bride 3' de sortie du corps 1', mais, de plus, l'entretoise aval 10' est également d'une seule pièce métallique avec le collecteur 5'. L'entretoise 10' est intégrée par son flan annulaire à l'embase 7' du collecteur 5', et son muret externe 16' est traversé par l'entrée d'alimentation 21' du canal annulaire 19 en gaz à recycler, et est appliqué contre la bride 3' du corps 1' par le joint d'étanchéité annulaire 17', les formes et dispositions du canal 19 et de la fente 20 restant inchangées.In the variant of FIG. 1C, there is a upstream spacer 9 'in a single metal part with the flange 3 'of body outlet 1', but, in addition, the spacer downstream 10 'is also made of a single metal part with the 5 'collector. The 10 'spacer is integrated by its blank annular to the base 7 'of the collector 5', and its wall external 16 'is crossed by the power input 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 the slot 20 remaining unchanged.

La variante de la figure 1D comprend une entretoise amont 9 associée à la bride 3 du corps 1 comme sur la figure 1A, mais coopérant avec une entretoise aval 10' d'une seule pièce métallique avec le collecteur 5', comme sur la figure 1C, avec l'unique différence que le joint d'étanchéité annulaire 17' des figures 1B et 1C est remplacé par le joint d'étanchéité 17 de la figure 1A, sur la face aval du flan annulaire 11 de l'entretoise amont 9, de l'autre côté du joint annulaire 13 sur la face amont de ce même flan 11, pour assurer l'étanchéité entre ce dernier et la bride 3.The variant of FIG. 1D comprises a spacer upstream 9 associated with the flange 3 of the body 1 as in the figure 1A, but cooperating with a 10 'downstream spacer of a single metal part with the 5 'collector, as in the figure 1C, with the only difference that the seal ring 17 'of FIGS. 1B and 1C is replaced by the seal seal 17 of FIG. 1A, on the downstream face of the blank annular 11 of the upstream spacer 9, on the other side of the annular seal 13 on the upstream face of this same blank 11, to seal between the latter and the flange 3.

Sur la variante de la figure 1E, le muret périphérique externe 16" n'appartient pas à l'entretoise aval 10", mais à l'entretoise amont 9". Ce muret 16", tubulaire et axial, est solidaire par son extrémité axiale amont de la périphérie radiale externe du flan annulaire radial 11" de l'entretoise amont 9", ce flan annulaire 11" étant, comme sur les figures 1A et 1D, solidaire par son bord radial interne de l'extémité axiale amont du muret tubulaire interne 12" de cette même entretoise amont 9". Cette entretoise amont 9" est appliquée par son muret externe 16", et avec interposition d'un joint d'étanchéité annulaire 17", contre le flan annulaire radial 15" de l'entretoise aval 10", qui peut être d'une seule pièce avec le collecteur 5", comme sur les figures 1C et 1D, ou rapportée contre le collecteur avec interposition d'un joint d'étanchéité annulaire, tel que le joint 18 sur les figures 1A et 1B.In the variant of FIG. 1E, the peripheral wall external 16 "does not belong to the downstream spacer 10", but at the upstream spacer 9 ". This 16" wall, tubular and axial, is integral by its axial end upstream of the external radial periphery of the 11 "radial annular blank of the upstream spacer 9 ", this annular blank 11" being, as in FIGS. 1A and 1D, secured by its radial edge internal of the upstream axial end 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 a 17 "annular seal, against the 15 "radial annular blank of the downstream spacer 10 ", which can be in one piece with the 5" manifold, as in FIGS. 1C and 1D, or reported against the manifold with interposition of a seal annular, such as the seal 18 in Figures 1A and 1B.

Les figures 2 à 4 représentent un premier exemple d'entretoise aval 30 pour un joint diffuseur annulaire tel que 8 sur la figure 1A. On retrouve un muret externe, tubulaire et axial 36 et un flan annulaire radial 35 à son extrémité aval. Le flan annulaire 35 est prolongé axialement par un embout tubulaire 37 à passage central divergent vers l'aval par un amincissement de paroi arrondi, et qui peut s'emmancher ou se raccorder de toute autre manière dans l'entrée du collecteur d'admission. Le muret externe 36 est entouré d'une collerette 38 qui supporte quatre manchons 39 de passage des boulons de fixation. Le muret 38 est traversé par une entrée d'alimentation radiale 41 pour la réinjection de vapeurs de combustible récupérées dans un canister et délivrées à l'entrée 41 par une vanne de commande de débit (non représentée). Le muret 36 est également traversé par une entrée d'alimentation tangentielle 42 (voir figure 2) pour la réinjection par exemple de gaz d'échappement du moteur, par l'intermédiaire d'une autre vanne de commande de débit (également non représentée). Vers l'extérieur, cette entrée d'alimentation tangentielle 42 est entourée d'une bride 43 de raccordement à une conduite de recirculation des gaz d'échappement.Figures 2 to 4 show a first example downstream spacer 30 for an annular diffuser seal such as as 8 in Figure 1A. We find an external wall, tubular and axial 36 and a radial annular blank 35 to its downstream end. The annular blank 35 is extended axially by a tubular end piece 37 with a central passage diverging towards downstream by a rounded wall thinning, which can to be fitted or otherwise connected in the inlet of the intake manifold. The external wall 36 is surrounded by a flange 38 which supports four sleeves 39 for fixing bolts. The low wall 38 is crossed by a radial supply inlet 41 for reinjection fuel vapor recovered in a canister and delivered to input 41 by a flow control valve (not shown). The low wall 36 is also crossed by a tangential supply input 42 (see Figure 2) for the reinjection, for example of exhaust gases from the engine, via another control valve debit (also not shown). Outward, this tangential feed inlet 42 is surrounded by a flange 43 for connection to a recirculation line for exhaust gas.

Les figures 5 et 6 représentent une entretoise amont 29 métallique, réalisée par découpe et emboutissage d'une pièce de tôle, et destinée à coopérer avec l'entretoise aval 30 des figures 2 à 4 pour former un joint diffuseur annulaire tel que 8 sur la figure 1A. L'entretoise amont 29 a une forme en plan sensiblement carrée à sommets arrondis et présente, autour de son mince muret tubulaire central 32, un flan annulaire 31 sur les deux faces opposées duquel sont surmoulés, en opposition, deux joints annulaires en élastomère 33 et 34 ayant chacun la forme d'un demi tore, et qui sont coaxiaux et de même rayon, et correspondent aux joints 13 et 17 de la figure 1A. Le joint 33 est ainsi sur la face du flan annulaire 31 qui est appliquée contre le corps papillon, et le joint 34 sur la face appliquée contre le muret externe 36 de l'entretoise aval 30 des figures 2 à 4. Radialement à l'extérieur des joints 33 et 34, le flan 31 présente quatre passages 40 (pour les boulons de fixation), qui viennent en regard des manchons 39 de l'entretoise aval 30, dans laquelle est engagé le muret central 32 de l'entretoise 29, montée sur l'entretoise 30 pour définir avec elle le canal et la fente annulaires.Figures 5 and 6 show an upstream spacer 29 metallic, 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 in Figure 1A. The upstream spacer 29 a a substantially square plan shape with rounded tops and presents, around its thin central tubular wall 32, a annular blank 31 on the two opposite faces of which are overmolded, 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 joints 13 and 17 of Figure 1A. The seal 33 is thus on the face of the annular blank 31 which is applied against the body butterfly, and the seal 34 on the face applied against the external wall 36 of the downstream spacer 30 of FIGS. 2 to 4. Radially outside the 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.

La figure 7 représente un second exemple d'entretoise aval 30', qui se distingue essentiellement de l'entretoise 30 des figures 2 à 4 par le fait que son muret périphérique externe 36' présente, en saillie latéralement vers l'extérieur, des ailettes de refroidissement 44' qui s'étendent axialement jusqu'à une collerette externe 38', de forme en plan sensiblement carrée à sommets arrondis au niveau desquels sont prévus des manchons 39' de passage de boulons. Cette entretoise 30', prévue pour la réinjection de gaz d'échappement chauds, est métallique, et son muret 36' est traversé par une entrée radiale 41' d'alimentation en vapeurs d'hydrocarbures et par une entrée tangentielle 42' d'alimentation en gaz d'échappement, par une conduite de recirculation à laquelle l'entretoise 30' est raccordée par la bride 43'. Enfin, comme dans l'exemple des figures 2 à 4, l'entretoise 30' peut comporter, sous sa collerette 38', un embout tubulaire 37' de raccordement à l'entrée du collecteur.Figure 7 shows a second example of a spacer downstream 30 ', which essentially differs from the spacer 30 of Figures 2 to 4 by the fact that its low wall external device 36 'present, projecting laterally outwards, 44 'cooling fins which extend axially to an external flange 38 ', of substantially square plan shape with rounded tops level which are provided with sleeves 39 'for passage of bolts. This 30 'spacer, provided for the reinjection of hot exhaust gas, is metallic, and its wall 36 ' is crossed by a radial inlet 41 'for supplying hydrocarbon vapors and through a tangential inlet 42 ' exhaust gas supply, via a recirculation to which the spacer 30 'is connected by the flange 43 '. Finally, as in the example in Figures 2 to 4, the spacer 30 'may include, under its collar 38', a tubular end piece 37 'for connection to the inlet of the manifold.

D'une manière générale, selon les applications, le corps papillon 1 et/ou l'embase d'entrée 7 du collecteur 5 peuvent ou peut être réalisé(s) en métal ou en une matière de synthèse, par exemple en thermoplastique. La réalisation de l'une et/ou de l'autre des entretoises d'une seule pièce avec le corps papillon et/ou le collecteur d'admission ne peut se faire que si les deux éléments à combiner d'une seule pièce peuvent être réalisés dans le même matériau, métallique ou de synthèse. Si des gaz à recycler sont à une température élevée, les entretoises au moins doivent être en un matériau compatible avec cette température, c'est-à-dire généralement en métal. En conséquence, chacune d'elles ne pourra être d'une seule pièce qu'avec une bride de sortie du corps papillon ou respectivement une embase d'entrée du collecteur qui est réalisée en métal.Generally, depending on the applications, the throttle body 1 and / or the inlet base 7 of the manifold 5 can or can be made of metal or a material synthetic, for example in thermoplastic. The realization of one and / or the other one-piece spacers with the throttle body and / or the intake manifold not can only be done if the two elements to combine from one single piece can be made of the same material, metallic or synthetic. If there are gases to be recycled high temperature, at least the spacers must be a material compatible with this temperature, i.e. usually made of metal. Consequently, each of them does not can be in one piece only with an outlet flange throttle body or respectively an input base of the collector which is made of metal.

Claims (13)

  1. An annular diffuser (8) for recycling carburetted gases for an internal combustion engine supplied with air via an intake manifold (5) on which a butterfly member (1) is mounted, the diffuser (8) comprising an annular duct (19) supplied with gases for recycling and formed between two means (9, 10) which between them define a passage for the gases for recycling in order to disperse the gases for recycling in the stream of air coming from the butterfly member (1), the means being two cross-members (9, 10) disposed between the outlet (2) of the butterfly member (1) and the inlet (6) of the manifold (5) and substantially coaxial around the axis of symmetry (X-X) common to the said outlet (2) and inlet (6), at least one inlet (21) for supplying the duct (19) with gases for recycling being formed at least partially in at least one of the cross-members (9, 10), one of which is an upstream cross-member (9) adjacent the outlet (2) of the butterfly member (1) and the other is a downstream cross-member (10) adjacent the inlet (6) of the manifold (5) and comprises a substantially radial collar (15) substantially coaxial with the inlet (6) of the manifold (5), characterised in that the two cross-members (9, 10) between them bound an annular slot (20) substantially coaxial with the outlet (2) of the butterfly member (1) and opening downstream of the duct (19) and of the said outlet (2) of the butterfly member (1), the upstream cross-member (9) comprising a substantially axial, tubular internal wall (12), the internal radial face whereof bounds a cylindrical duct prolonging and substantially coaxial with the outlet (2) of the butterfly member (1), whereas the outer radial face forms the inner radial wall of the annular duct (19), the annular slot (20) being bounded between the downstream axial end of the tubular wall (12) and the inner radial end of the annular collar (16) of the downstream cross-member (10), so that the diffuser is annular.
  2. A diffuser according to claim 1, characterised in that the upstream cross-member (9) also comprises a substantially radial annular collar (11) secured to the inner tubular wall (12) of the upstream cross-member (9).
  3. A diffuser according to claim 2, characterised in that the annular collar (11) of the upstream cross-member (9) is fixed, with interposition of at least one annular seal (13), against a substantially radial downstream face of the butterfly member (1) around the outlet (2) thereof.
  4. A diffuser according to claim 1 or 2, characterised in that the upstream cross-member (9') is in one piece with the butterfly member (1') and is either of metal or of synthetic material.
  5. A diffuser according to any of claims 2 to 4, characterised in that the upstream cross-member (9'') also comprises a substantially axial tubular outer peripheral wall (16'') fixed, with interposition of at least one annular seal (17''), against the annular collar (15'') of the downstream cross-member (10'').
  6. A diffuser according to any of claims 2 to 4, characterised in that the downstream cross-member (10) also comprises a substantially axial tubular outer peripheral wall (16) secured to the annular collar (15) of the downstream cross-member (10), and against which the upstream cross-member (9) is fixed. with interposition of at least one annular seal (17).
  7. A diffuser according to claim 6, characterised in that the downstream cross-member (10') is in one piece with the manifold (5') and is of metal or of synthetic material.
  8. A diffuser according to claim 6, characterised in that the downstream cross-member (10) is fixed via its annular collar (15) and/or its outer wall (16) and with interposition of at least one annular seal (18), against a substantially radial upstream face of the manifold (5), around the inlet (6) thereof.
  9. A diffuser according to any of claims 6 to 8 as appended to claim 3, characterised in that two annular seals (33, 34) are each moulded on a respective surface of the annular collar (31) of the upstream cross-member (29), one surface facing towards the butterfly member (1) and the other facing towards the outer wall (36) of the downstream cross-member (30).
  10. A diffuser according to any of claims 5 to 9, characterised in that the said outer peripheral wall (36') has cooling fins (44') projecting towards the exterior of the metal cross-member (30'), which comprises the wall.
  11. A diffuser according to any of claims 5 to 10, characterised in that the outer peripheral wall (36') is pierced by at least one substantially radial supply inlet (41') and/or at least one substantially tangential supply inlet (42') of the annular duct (19) for gases for recycling.
  12. A diffuser according to any of claims 1 to 11, characterised in that it is assembled and fixed between the outlet (2) of the butterfly member (1) and the inlet (6) of the manifold (5) by bolts (4) for securing the butterfly member (1) on to an inlet base (7) of the manifold (5).
  13. A diffuser according to any of claims 1 to 12, characterised in that the downstream axial end of the inner tubular wall (12) of the upstream cross-member (9) has the shape of a substantially frusto-conical lip (14) converging downstream or having a bevel (14') inclined from the outer radial surface towards the inner radial surface of the wall (12), the differences in radius and/or the axial distances between the inner edges of the cross-members (9, 10, 9', 10', 9", 10'') which bound the said slot (20) and, if applicable, the angle of inclination (α) of the frusto-conical lip (14) being chosen to optimise the negative pressure during suction and to avoid noise.
EP96402149A 1995-10-13 1996-10-10 Annular diffusor for exhaust gas recirculation for internal combustion engine Expired - Lifetime EP0768462B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9512040 1995-10-13
FR9512040A FR2739897B1 (en) 1995-10-13 1995-10-13 ANNULAR CARBIDE GAS RECYCLING DIFFUSER, FOR INTERNAL COMBUSTION ENGINE

Publications (2)

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

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EP96402149A Expired - Lifetime EP0768462B1 (en) 1995-10-13 1996-10-10 Annular diffusor for exhaust gas recirculation for internal combustion engine

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EP (1) EP0768462B1 (en)
DE (1) DE69618309T2 (en)
ES (1) ES2170842T3 (en)
FR (1) FR2739897B1 (en)

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DE19809862A1 (en) * 1998-03-07 1999-09-09 Mann & Hummel Filter Exhaust gas recirculation device for an internal combustion engine
EP1276982A1 (en) * 2000-04-17 2003-01-22 Robert Bosch Gmbh Device for mixing and dosing gas flows in internal combustion engines
DE202013009087U1 (en) * 2013-10-15 2013-11-19 Motorenfabrik Hatz Gmbh & Co. Kg Mixing device for exhaust gas recirculation
DE102014201935A1 (en) * 2014-02-04 2015-08-20 Mahle International Gmbh Arrangement for exhaust gas recirculation

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JPS55139252U (en) * 1979-03-27 1980-10-04
GB2060765A (en) * 1979-08-24 1981-05-07 Chester R A Adding fluids in fuel-air mixture intake passages
DE3413419A1 (en) * 1983-04-11 1984-10-11 August, Paul, Dipl.-Ing. Dr.h.c., Barcelona Device for introducing additional gas flows into the intake port of a mixture-compressing internal combustion engine
DE3511094A1 (en) * 1985-03-27 1986-10-09 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim Device for feeding an auxiliary gas flow into the intake port of a spark ignition engine

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FR2739897A1 (en) 1997-04-18
DE69618309T2 (en) 2002-08-22
FR2739897B1 (en) 1997-12-12
EP0768462A1 (en) 1997-04-16
ES2170842T3 (en) 2002-08-16
DE69618309D1 (en) 2002-02-07

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