EP1122421A2 - Intake conduit with integrated exhaust gas recirculation - Google Patents

Intake conduit with integrated exhaust gas recirculation Download PDF

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Publication number
EP1122421A2
EP1122421A2 EP01100348A EP01100348A EP1122421A2 EP 1122421 A2 EP1122421 A2 EP 1122421A2 EP 01100348 A EP01100348 A EP 01100348A EP 01100348 A EP01100348 A EP 01100348A EP 1122421 A2 EP1122421 A2 EP 1122421A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
suction
pipe
exhaust
walls
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.)
Granted
Application number
EP01100348A
Other languages
German (de)
French (fr)
Other versions
EP1122421B1 (en
EP1122421A3 (en
Inventor
Herbert Pietrowski
Achim Rehmann
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.)
Mann and Hummel GmbH
Original Assignee
Filterwerk Mann and Hummel GmbH
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Publication date
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Publication of EP1122421A2 publication Critical patent/EP1122421A2/en
Publication of EP1122421A3 publication Critical patent/EP1122421A3/en
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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
    • F02M35/10209—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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts
    • 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
    • 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
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10039—Intake ducts situated partly within or on the plenum chamber housing
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10052—Plenum chambers special shapes or arrangements of plenum chambers; Constructional details
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10072—Intake runners
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10078—Connections of intake systems to the engine
    • 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
    • F02M35/10111—Substantially V-, C- or U-shaped ducts in direction of the flow path
    • 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
    • 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
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10268—Heating, cooling or thermal insulating means
    • 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
    • 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
    • F02M35/104—Intake manifolds
    • F02M35/1045—Intake manifolds characterised by the charge distribution between the cylinders/combustion chambers or its homogenisation
    • 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
    • F02M35/104—Intake manifolds
    • F02M35/112—Intake manifolds for engines with cylinders all in one line
    • 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
    • F02M35/104—Intake manifolds
    • F02M35/116—Intake manifolds for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft
    • 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
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages

Definitions

  • the invention relates to an intake manifold with an integrated exhaust gas recirculation, which a connection for the exhaust gas and supply openings for the different suction channels has, according to the preamble of claim 1.
  • the object of the invention is therefore a suction pipe with an integrated exhaust gas recirculation to create, in which the thermal from the exhaust gas recirculation The load on the intake manifold is low.
  • This task is characterized by the characteristics of the Claim 1 solved.
  • the suction pipe according to the invention has the known structure with inlet, collecting space, from this outgoing suction channels and outlets to the cylinders.
  • the outlets can usefully be designed as a cylinder head flange.
  • the Intake pipe can be used for a row arrangement, V arrangement or any other Arrangement of the cylinders can be provided. It is also possible to have multiple collection rooms to provide, which are assigned to the respective groups of suction channels.
  • the intake manifold has a connection for the exhaust gas recirculation.
  • An exhaust pipe leads the exhaust gas to supply openings, each of which is through the suction channels influenced flow area of the intake air are arranged.
  • exhaust gas can be supplied separately to each cylinder, whereby a desired, ensures, in particular, uniform distribution of the exhaust gas over all cylinders becomes.
  • Valves can be provided in the supply area of the exhaust gas, the one cylinder-selective exhaust gas introduction depending on the timing of the individual Allow cylinders.
  • the flow area influencing the suction channels understood the area of extensive assignment of the supplied exhaust gas to a suction channel. So below that is not just the volume of the suction channel to understand yourself.
  • the feed openings can also be in the volume of Collecting space and in the vicinity of the suction openings formed by the suction channels, which open into the collecting room, can be arranged.
  • This essentially means a clear assignment of the exhaust gas to the individual suction channels possible.
  • connections and Exhaust pipes are provided in the intake manifold.
  • the connections and the exhaust pipe create a design advantage in the construction of the intake manifold Scope as there are fewer constraints when laying the cables in the collecting room by other components, such as. B. the injectors, cylinder head cover, generators, Pumps, the fuel rail or screwdriver clearances are observed have to.
  • Another advantage is that the exhaust pipe through the intake air is flowed around in the collecting room. This way, before the exhaust gas is introduced cooling of the same is possible in the suction pipe. The cooling must, however not through a separate duct system or one that is foreign to the combustion air Cooling medium can be reached. An additional design effort for cooling is therefore not incurred.
  • the requirements for the tightness of the exhaust duct are also lower in the intake manifold, since a small leak only leads to an earlier admixture of the exhaust gas leads to the intake air.
  • Screw connections and rivets are conceivable, for example Clamping, plug-in and snap connections, in addition, with a multi-layer Structure of the intake manifold a fixation of the exhaust pipe by mounting the Intake pipe shells are made. Bridges as spacers can conduct heat minimize with sufficient fixation. A further minimization is advantageous possible in that the holding means themselves allow low heat conduction. This can be done in particular by a small cross section of the holding means, that create a thermal bridge between the intake manifold wall and the exhaust pipe, or by choosing materials with low thermal conductivity, e.g. B. ceramics.
  • the supply openings of the exhaust pipe serve if this through the walls of the Suction channels must be guided.
  • a connection is therefore inevitable here between exhaust pipe and walls of the intake manifold, in particular the Suction channel, with the help of which the exhaust pipe can be fixed.
  • a ceramic fitting can also be used be at least the thermal insulation between the exhaust pipe and Suction pipe guaranteed.
  • the shaped piece made of ceramic can also be used for any Geometry of the discharge point, e.g. B. as a nozzle. The geometry of the discharge point can then with regard to an optimal distribution of the exhaust gas in the intake air be designed.
  • the feed openings become in the area of the suction openings the suction channels arranged, so the heat transfer can be further reduced.
  • the shells can e.g. B. consist of two deep-drawn metal parts, with the help of complicated geometric structures of the exhaust pipe let it be realized.
  • other functional components can be found in the shells be integrated.
  • flanges or spacers for fixing the exhaust pipe inside the intake manifold can be manufactured inexpensively.
  • the through the The channel structure formed by the shells can be supplemented by other components, the the base part can be assembled. So it is z. B. possible by connecting Pipes to complete the exhaust pipe.
  • the manufacture of the exhaust pipe from a metallic material ensures good heat conduction from the exhaust gas to the intake air in the intake manifold. Thereby optimal cooling of the exhaust gas can be achieved up to the inlet points, which makes the walls of the intake manifold less thermal in the area of the inlet points be charged.
  • metallic materials have a high temperature resistance, so that high recirculation rates of exhaust gas into the intake manifold are realized can be.
  • a heat-resistant plastic e.g. B. PPS can be used. Let it go favorable manufacturing and material costs are achieved.
  • the suction pipe itself is advantageously made of plastic. This is economical production possible. Especially with multi-shell technology the exhaust pipe without problems before final assembly of the intake manifold integrate. However, integration is also conceivable with plastic suction pipes, which are manufactured in melt core technology. In this case either Installation opening for the exhaust pipe are provided or the exhaust pipe in the Melting core are poured in, so that their position in the interior of the intake manifold is defined.
  • the invention can also be used in suction pipes made of metal, e.g. B. aluminum.
  • the geometry of the exhaust pipe in the intake manifold can advantageously be made in this way design that the path covered by the exhaust gas from the respective connection to the respective feed opening to the suction channels is always the same length. This synchronizes the dead times between opening the exhaust gas recirculation valve and introduction of the exhaust gas into the suction channels. Besides, will In this way, the exhaust gas is cooled to the same extent as the individual inlet points reached. The equalization of these effects leads to an optimal one Pollutant reduction through exhaust gas recirculation. Furthermore, a possible Reduction of engine torque counteracted by a short circuit, caused by the exhaust gas recirculation lines, could arise. The length of the Lines counteracts this as a choke.
  • FIG. 1 provides an insight into a lower shell 10 of an intake pipe. It is to recognize how the intake air according to the arrows from an inlet 11 on two collecting spaces 12 reaches suction openings 13 of suction channels 14, which lead to Outlets of a cylinder head flange 15, not shown.
  • An exhaust pipe 17a, b leads from a connection 16, which is shown in FIG. 1 in two variants is shown, to supply openings 18a, b, which the introduction of the exhaust gas in Area of the suction channels allowed.
  • the exhaust pipe 17a is by means of a snap connection 19 attached to walls 20 of the intake manifold. This creates a minimum distance a observed between wall 20 and exhaust pipe 17a, which leads to a thermal protection of the wall 20 contributes.
  • the exhaust pipe 17b is by means of Screws 21 fastened via tabs 22 in the intake manifold.
  • the structure of the exhaust pipe 17b can also be seen in FIG. 2. This is composed of two shells 23, which creates the cavity for conduction the exhaust gases are created.
  • the tab 22 for attaching the exhaust pipe is also integral part of one of the shells.
  • the feed opening 18b is in a feedthrough 24b inserted in the wall 20b of the corresponding suction channel 14. On at this point there is an admixture to the intake air, which leads to one of the outlets 25 flows in the cylinder head flange 15.
  • the intake manifold is manufactured and welded using multi-shell technology.
  • the suction channels 14 are welded into the lower shell 10.
  • an upper shell 27 with the lower shell 10 welded.
  • connection 16 is shown as a detail in section.
  • the connection exists from a pipe socket 28 which with the aid of a mounting flange 29 in a Implementation 24 is fixed.
  • a seal 30 in the form of an O-ring is in the Implementation housed.
  • the tube ends in a screw socket on one side 31, which allows the attachment of an exhaust pipe 32 and on the other Side in the exhaust pipe 17a, b (both versions are shown).
  • the pipe socket is in the area the implementation 24 designed as a bell-shaped hollow profile 33.
  • the feed openings 18b in the bushings 24b can also be designed in this way be that the heat conduction from the exhaust pipe to the wall 20b of the Suction channels 14 is prevented.
  • the feed is designed as a piece of pipe 34, which contains a bellows 35.
  • the exhaust pipe is on this piece of pipe 17b attached.
  • the pipe section in turn is inserted into the bushing 24b.
  • a shaped piece 36 made of ceramic can also be used. This is free in its design.
  • a nozzle 37 is formed at the end thereof, which leads to a targeted introduction of the exhaust gas. This nozzle is corresponding the curvature of the suction channel 14 aligned in the flow direction of the intake air.
  • FIG. 6 shows another example of a suction pipe, a part of the Collection space 12 is cut open, so that 2 variants of an exhaust pipe 17c and 17d become visible. This is through connection 16 and the snap connection 19 fixed.
  • the feed openings 18c of one variant open into the one described In the suction openings 13 of the suction channels 14.
  • the feed openings 18d are distributed stoichiometrically or regularly on the surface of the exhaust pipe 17d and thus lead to a uniform mixing of the intake air with recirculated Exhaust gas before it reaches the suction channels 14.

Abstract

Die Erfindung bezieht sich auf ein Saugrohr mit einem integrierten Abgasrückführsystem (16, 17a, 17b). Dieses befindet sich hauptsächlich im Sammelraum (12) des Saugrohres und weist einen Abstand a zu den Wandungen (20) des Saugrohres auf. Hierdurch kann eine Wärmeübertragung auf das Gehäuse des Saugrohres nur in geringem Maße erfolgen, so dass dieses z. B. aus Kunststoff hergestellt werden kann. Eine weitere Entlastung des Kunststoffgehäuses, insbesondere der Ansaugkanäle (14) wird dadurch erreicht, dass die Ansaugluft im Sammelraum das Abgas in den Abgasleitungen (17a, b) kühlt, wodurch das Ansaugluftabgasgemisch in den Saugkanälen (14) auch bei hohen Abgasrückführraten die kritische Temperatur für die Kunststoffwandungen (20) nicht überschreitet. <IMAGE>The invention relates to an intake manifold with an integrated exhaust gas recirculation system (16, 17a, 17b). This is mainly located in the collecting space (12) of the suction pipe and is at a distance a from the walls (20) of the suction pipe. As a result, heat can be transferred to the housing of the suction pipe only to a small extent, so that this z. B. can be made of plastic. A further relief of the plastic housing, in particular the intake ducts (14), is achieved in that the intake air in the collecting space cools the exhaust gas in the exhaust pipes (17a, b), so that the intake air and exhaust gas mixture in the intake ducts (14) maintains the critical temperature for the exhaust gas recirculation rates does not exceed the plastic walls (20). <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Saugrohr mit einer integrierten Abgasrückführung, welche einen Anschluss für das Abgas und Zuführöffnungen für die verschiedenen Saugkanäle aufweist, nach der Gattung des Patentanspruches 1.The invention relates to an intake manifold with an integrated exhaust gas recirculation, which a connection for the exhaust gas and supply openings for the different suction channels has, according to the preamble of claim 1.

Saugrohre der eingangs beschriebenen Art sind bekannt. So lässt sich der WO 97/ 34081 ein Saurohr entnehmen, bei dem die Kanäle zur Abgasrückführung durch Nuten im Zylinderkopfflansch gebildet werden, wobei nach erfolgter Montage des Saugrohres auf dem Zylinderkopf die fehlende Wandung der Abgasrückführkanäle durch diesen gebildet werden.Suction pipes of the type described in the introduction are known. How WO 97 / 34081 remove an intake pipe, through which the channels for exhaust gas recirculation Grooves are formed in the cylinder head flange, after the assembly of the Intake manifold on the cylinder head the missing wall of the exhaust gas recirculation channels be formed by this.

Durch die in den Abgasrückführkanälen auftretenden thermischen Belastungen muss zumindest der Zylinderkopfflansch des Saugrohres aus einem temperaturbeständigen Material hergestellt werden. Bei Saugrohren aus Metall ist diese Bedingung im allgemeinen unkritisch. Bei Kunststoffsaugrohren, die eine ausgesprochen wirtschaftliche Lösung darstellen, können die auftretenden thermischen Belastungen in der Abgasrückführung jedoch zu einer Beschädigung führen. Due to the thermal loads occurring in the exhaust gas recirculation channels at least the cylinder head flange of the intake manifold from a temperature-resistant Material are made. For metal suction pipes, this condition is in the general uncritical. In the case of plastic suction pipes, which are extremely economical The thermal loads occurring can represent a solution exhaust gas recirculation, however, can lead to damage.

Will man die thermischen Belastungen im Kunststoffsaugrohr gering halten, so ergibt sich gemäß der DE 198 19 123 A1 die Möglichkeit, die Abgasrückführung in einem Zwischenflansch unterzubringen, welcher temperaturbeständig ist und den Zylinderkopfflansch des Saugrohres mit dem Zylinderkopf selbst verbindet. Diese Lösung hat jedoch einen komplexeren Aufbau des Ansaugtraktes zur Folge. Die Koseneinsparungen, die durch die Ausführung des Saugrohrs in Kunststoff erreicht werden können, werden durch den Zusatzaufwand des Zwischenflansches verringert.If you want to keep the thermal loads in the plastic suction pipe low, you get according to DE 198 19 123 A1 the possibility of exhaust gas recirculation in one To accommodate the intermediate flange, which is temperature-resistant and the cylinder head flange of the intake manifold connects to the cylinder head itself. Has this solution however, this results in a more complex structure of the intake tract. The savings in costs, which can be achieved by designing the suction pipe in plastic, are reduced by the additional effort of the intermediate flange.

Aufgabe der Erfindung ist es daher, ein Saugrohr mit einer integrierten Abgasrückführung zu schaffen, bei der die von der Abgasrückführung ausgehende thermische Belastung des Saugrohres gering ist. Diese Aufgabe wird durch die Merkmale des Patentanspruches 1 gelöst.The object of the invention is therefore a suction pipe with an integrated exhaust gas recirculation to create, in which the thermal from the exhaust gas recirculation The load on the intake manifold is low. This task is characterized by the characteristics of the Claim 1 solved.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Saugrohr weist den bekannten Aufbau mit Einlass, Sammelraum, von diesem abgehenden Saugkanälen und Auslässen zu den Zylindern auf. Dabei können die Auslässe sinnvoll als Zylinderkopfflansch ausgeführt sein. Das Saugrohr kann für eine Reihenanordnung, V-Anordnung oder eine sonstige beliebige Anordnung der Zylinder vorgesehen sein. Es ist auch möglich, mehrere Sammelräume vorzusehen, die jeweiligen Gruppen von Saugkanälen zugeordnet sind.The suction pipe according to the invention has the known structure with inlet, collecting space, from this outgoing suction channels and outlets to the cylinders. The outlets can usefully be designed as a cylinder head flange. The Intake pipe can be used for a row arrangement, V arrangement or any other Arrangement of the cylinders can be provided. It is also possible to have multiple collection rooms to provide, which are assigned to the respective groups of suction channels.

Weiterhin weist das Saugrohr einen Anschluss für die Abgasrückführung auf. Über eine Abgasleitung wird das Abgas zu Zuführöffnungen geführt, die jeweils im durch die Saugkanäle beeinflussten Strömungsbereich der Ansaugluft angeordnet sind. Dadurch kann jedem Zylinder gesondert Abgas zugeführt werden, wodurch eine gewünschte, insbesondere gleichmäßige Verteilung des Abgases auf alle Zylinder gewährleistet wird. Im Zuführbereich des Abgases können Ventile vorgesehen werden, die eine zylinderselektive Abgaseinleitung abhängig von der Taktung der einzelnen Zylinder ermöglichen. Als die Saugkanäle beeinflussender Strömungsbereich wird der Bereich verstanden, der eine weitgehende Zuordnung des zugeführten Abgases zu einem Saugkanal ermöglicht. Darunter ist also nicht nur das Volumen des Saugkanals selbst zu verstehen. Die Zuführöffnungen können auch im Volumen des Sammelraums und in der Nähe der durch die Saugkanäle gebildeten Ansaugöffnungen, die in den Sammelraum münden, angeordnet sein. Hierdurch ist im wesentlichen eine eindeutige Zuordnung des Abgases zu den einzelnen Saugkanälen möglich. Alternativ ist jedoch auch eine stöcheometrische Verteilung von Öffnungen in der Abgasleitung möglich.Diese erzielen eine gleichmäßige Verteilung des Abgases in der Ansaugluft, die anschließend den Saugkanälen zugeleitet wird..Furthermore, the intake manifold has a connection for the exhaust gas recirculation. about An exhaust pipe leads the exhaust gas to supply openings, each of which is through the suction channels influenced flow area of the intake air are arranged. As a result, exhaust gas can be supplied separately to each cylinder, whereby a desired, ensures, in particular, uniform distribution of the exhaust gas over all cylinders becomes. Valves can be provided in the supply area of the exhaust gas, the one cylinder-selective exhaust gas introduction depending on the timing of the individual Allow cylinders. As the flow area influencing the suction channels understood the area of extensive assignment of the supplied exhaust gas to a suction channel. So below that is not just the volume of the suction channel to understand yourself. The feed openings can also be in the volume of Collecting space and in the vicinity of the suction openings formed by the suction channels, which open into the collecting room, can be arranged. This essentially means a clear assignment of the exhaust gas to the individual suction channels possible. Alternatively, however, is a stoichiometric distribution of openings in of the exhaust pipe possible, which achieve an even distribution of the exhaust gas in the intake air, which is then fed to the suction channels ..

Insbesondere bei mehreren Sammelräumen können auch mehrere Anschlüsse und Abgasleitungen im Saugrohr vorgesehen werden. Die Anschlüsse und die Abgasleitung schaffen bei der Konstruktion des Saugrohres vorteilhaft einen gestalterischen Spielraum, da bei der Verlegung der Leitungen im Sammelraum weniger Randbedingungen durch andere Bauteile, wie z. B. die Einspritzventile, Zyinderkopfhaube, Generatoren, Pumpen, die Kraftstoffleiste oder Schrauberfreigänge beachtet werden müssen. Ein weiterer Vorteil besteht darin, dass die Abgasleitung durch die Ansaugluft im Sammelraum umströmt wird. Auf diese Weise ist vor der Einleitung des Abgases in das Saugrohr eine Abkühlung derselben möglich. Die Kühlung muss jedoch nicht durch ein separates Kanalsystem oder ein von der Verbrennungsluft artfremdes Kühlmedium erreicht werden. Ein zusätzlicher konstruktiver Aufwand für die Kühlung fällt somit nicht an. Auch sind die Anforderungen an die Dichtheit des Abgaskanals im Saugrohr geringer, da eine geringe Leckage lediglich zu einer früheren Zumischung des Abgases zur Ansaugluft führt.In particular with several collecting rooms, several connections and Exhaust pipes are provided in the intake manifold. The connections and the exhaust pipe create a design advantage in the construction of the intake manifold Scope as there are fewer constraints when laying the cables in the collecting room by other components, such as. B. the injectors, cylinder head cover, generators, Pumps, the fuel rail or screwdriver clearances are observed have to. Another advantage is that the exhaust pipe through the intake air is flowed around in the collecting room. This way, before the exhaust gas is introduced cooling of the same is possible in the suction pipe. The cooling must, however not through a separate duct system or one that is foreign to the combustion air Cooling medium can be reached. An additional design effort for cooling is therefore not incurred. The requirements for the tightness of the exhaust duct are also lower in the intake manifold, since a small leak only leads to an earlier admixture of the exhaust gas leads to the intake air.

Die Einhaltung eines Abstandes der Abgasleitung zu den Wandungen des Saugrohres verhindert eine Wärmeleitung der sich erwärmenden Abgasleitung in das Saugrohrmaterial. Hierdurch kann eine thermische Belastung des Saugrohres stark verringert werden. Eine direkte Wärmeleitung ist nur über die Haltemittel möglich, welche die Abgasleitung im Saugrohrinneren fixieren. Als Haltemittel dient zumindest eine Abdichtung, die am Rand einer Durchführung für den Anschluss notwendig wird. Der Anschluss liegt somit außerhalb des Saugrohres, so dass ein Anschluss an die Abgasanlage der Brennkraftmaschine möglich ist. Weitere Haltemittel für die Abgasleitung können durch alle verfügbaren Mittel der Verbindungstechnik erreicht werden. Compliance with a distance from the exhaust pipe to the walls of the intake manifold prevents heat conduction of the warming exhaust pipe into the intake pipe material. This can greatly reduce the thermal load on the intake manifold become. Direct heat conduction is only possible via the holding means, which fix the exhaust pipe inside the intake manifold. At least serves as a holding means a seal that is necessary at the edge of a bushing for the connection. The connection is therefore outside the intake manifold, so that a connection to the Exhaust system of the internal combustion engine is possible. Other holding means for the exhaust pipe can be achieved by all available means of connection technology.

Es sind beispielsweise Verschraubungen und Vernietungen denkbar, weiterhin Klemm-, Steck- und Schnappverbindungen, außerdem kann bei einem mehrschaligen Aufbau des Saugrohres eine Fixierung der Abgasleitung durch die Montage der Saugrohrschalen erfolgen. Stege als Abstandshalter können dabei die Wärmeleitung bei einer genügenden Fixierung minimieren. Eine weitere Minimierung ist vorteilhafterweise dadurch möglich, dass die Haltemittel selbst eine geringe Wärmeleitung zulassen. Dies lässt sich inbesondere durch einen geringen Querschnitt der Haltemittel, die eine Wärmebrücke zwischen Saugrohrwandung und Abgasleitung herstellen, oder durch die Wahl von Materialien mit geringer Wärmeleitfähigkeit, z. B. Keramik, erreichen.Screw connections and rivets are conceivable, for example Clamping, plug-in and snap connections, in addition, with a multi-layer Structure of the intake manifold a fixation of the exhaust pipe by mounting the Intake pipe shells are made. Bridges as spacers can conduct heat minimize with sufficient fixation. A further minimization is advantageous possible in that the holding means themselves allow low heat conduction. This can be done in particular by a small cross section of the holding means, that create a thermal bridge between the intake manifold wall and the exhaust pipe, or by choosing materials with low thermal conductivity, e.g. B. ceramics.

Gemäß einer besonderen Ausgestaltung der Erfindung können als Haltemittel auch die Zuführöffnungen der Abgasleitung dienen, wenn diese durch die Wandungen der Saugkanäle geführt werden müssen. Hier ergibt sich somit zwangsläufig eine Verbindung zwischen Abgasleitung und Wandungen des Saugrohres, insbesondere des Saugkanals, mit deren Hilfe die Abgasleitung fixiert werden kann.According to a special embodiment of the invention can also be used as holding means the supply openings of the exhaust pipe serve if this through the walls of the Suction channels must be guided. A connection is therefore inevitable here between exhaust pipe and walls of the intake manifold, in particular the Suction channel, with the help of which the exhaust pipe can be fixed.

Eine derartige Anordnung der Zuführöffnung, die zu einer definierten Einleitung des Abgases in die Ansaugluft in den Saugkanälen führt, kann durch eine vorteilhafte Ausgestaltung der Verbindungsstelle in den Durchführungen der Wandung verbessert werden. Hier lässt sich z. B. ein balgartiges Rohrstück verwenden, welches zum einen durch die Vergrößerung der Oberfläche am Balg bzw. eine Verlängerung der Wämemleitungsstrecke zu einer thermischen Isolierung der Abgasleitung zum Saugrohr hin führt. Das balgartige Rohrstück selbst ist zur Durchleitung bzw. Einleitung des Abgases in den Saugkanal geeignet. Weiterhin ermöglicht der Balg durch seine Elastizität einen gewissen Toleranzausgleich zwischen Abgasleitung und Saugrohr. Dieser wird notwendig zum einen aufgrund auftretender Fertigungstoleranzen, zum anderen aber auch aufgrund der unterschiedlichen Wärmedehnung der Materialien der Abgasleitung und des Saugrohrs bzw. deren unterschiedlicher thermischer Belastung. Anstelle des Rohrstückes kann auch ein keramisches Formstück verwendet werden, welches zumindest die thermische Isolierung zwischen Abgasleitung und Saugrohr gewährleistet. Mit dem Formstück aus Keramik lässt sich zudem eine beliebige Geometrie der Einleitstelle, z. B. als Düse, erreichen. Die Geometrie der Einleitstelle kann dann hinsichtlich einer optimalen Verteilung des Abgases in der Ansaugluft gestaltet werden.Such an arrangement of the feed opening, which leads to a defined introduction of the Exhaust gas leading into the intake air in the intake ducts can be advantageous Design of the connection point in the bushings of the wall improved become. Here z. B. use a bellows-like pipe section, which for one by increasing the surface area of the bellows or extending the Wämemleitung stretch for thermal insulation of the exhaust pipe to the intake manifold leads there. The bellows-like piece of pipe itself is for passage or introduction of the exhaust gas in the suction channel. Furthermore, the bellows enables through its Elasticity a certain tolerance compensation between exhaust pipe and intake manifold. This becomes necessary on the one hand due to manufacturing tolerances that occur others because of the different thermal expansion of the materials the exhaust pipe and the intake manifold or their different thermal loads. Instead of the pipe section, a ceramic fitting can also be used be at least the thermal insulation between the exhaust pipe and Suction pipe guaranteed. The shaped piece made of ceramic can also be used for any Geometry of the discharge point, e.g. B. as a nozzle. The geometry of the discharge point can then with regard to an optimal distribution of the exhaust gas in the intake air be designed.

Werden die Zuführöffnungen wie bereits erwähnt im Bereich der Ansaugöffnungen der Saugkanäle angeordnet, so kann die Wärmeübertragung weiter vermindert werden. Außerdem ist eine mittige Einleitung bezogen auf den Querschnitt der Ansaugkanäle möglich, wodurch eine gleichmäßige Verteilung des Abgases in der Ansaugluft erfolgen kann. Dabei lassen sich im übrigen große Toleranzen realisieren.As already mentioned, the feed openings become in the area of the suction openings the suction channels arranged, so the heat transfer can be further reduced. In addition, there is a central introduction based on the cross section of the intake ducts possible, which ensures an even distribution of the exhaust gas in the intake air can be done. Large tolerances can also be realized.

Eine günstige Ausgestaltung der Abgasleitung ergibt sich, wenn diese mehrschalig ausgebildet ist. Die Schalen können z. B. aus zwei tief gezogenen Metallteilen bestehen, mit deren Hilfe sich komplizierte geometrische Strukturen der Abgasleitung realisieren lassen. Außerdem können in den Schalen weitere Funktionskomponenten integriert sein. Insbesondere Flansche oder Abstandshalter zur Fixierung der Abgasleitung im Saugrohrinneren lassen sich kostengünstig herstellen. Die durch die Schalen gebildete Kanalstruktur lässt sich durch weitere Bauteile ergänzen, die an das Grundteil montiert werden können. So ist es z. B. möglich, durch Anschluss von Rohren die Abgasleitung zu komplettieren.A favorable design of the exhaust pipe results if it has multiple layers is trained. The shells can e.g. B. consist of two deep-drawn metal parts, with the help of complicated geometric structures of the exhaust pipe let it be realized. In addition, other functional components can be found in the shells be integrated. In particular flanges or spacers for fixing the exhaust pipe inside the intake manifold can be manufactured inexpensively. The through the The channel structure formed by the shells can be supplemented by other components, the the base part can be assembled. So it is z. B. possible by connecting Pipes to complete the exhaust pipe.

Die Herstellung der Abgasleitung aus einem metallischen Werkstoff gewährleistet eine gute Wärmeleitung vom Abgas hin zu der Ansaugluft im Saugrohr. Dadurch kann eine optimale Abkühlung des Abgases bis zu den Einleitstellen erreicht werden, wodurch die Wandungen des Saugrohrs im Bereich der Einleitstellen weniger thermisch belastet werden. Außerdem besitzen metallische Werkstoffe eine hohe Temperaturbeständigkeit, so dass hohe Rückführraten an Abgas in das Saugrohr realisiert werden können. Bei geringer thermischer Belastung kann für die Abgasleitung auch ein hitzebeständiger Kunststoff, z. B. PPS, verwendet werden. Dabei lassen sich günstige Fertigungs- und Materialkosten erreichen.The manufacture of the exhaust pipe from a metallic material ensures good heat conduction from the exhaust gas to the intake air in the intake manifold. Thereby optimal cooling of the exhaust gas can be achieved up to the inlet points, which makes the walls of the intake manifold less thermal in the area of the inlet points be charged. In addition, metallic materials have a high temperature resistance, so that high recirculation rates of exhaust gas into the intake manifold are realized can be. At low thermal loads can be used for the exhaust pipe also a heat-resistant plastic, e.g. B. PPS can be used. Let it go favorable manufacturing and material costs are achieved.

Das Saugrohr selbst wird vorteilhafterweise aus Kunststoff gefertigt. Hierdurch ist eine wirtschaftliche Herstellung möglich. Insbesondere bei Mehrschalentechnik lässt sich die Abgasleitung vor der Endmontage des Saugrohres unproblematisch in dieses integrieren. Eine Integration ist jedoch auch bei Kunststoffsaugrohren denkbar, die in Schmelzkerntechnik hergestellt werden. In diesem Falle müsste entweder eine Einbauöffnung für die Abgasleitung vorgesehen werden oder die Abgasleitung in den Schmelzkern eingegossen werden, so dass dadurch ihre Position im Saugrohrinneren definiert wird. Selbstverständlich lässt sich die Erfindung auch in Saugrohren aus Metall, z. B. Aluminium, anwenden.The suction pipe itself is advantageously made of plastic. This is economical production possible. Especially with multi-shell technology the exhaust pipe without problems before final assembly of the intake manifold integrate. However, integration is also conceivable with plastic suction pipes, which are manufactured in melt core technology. In this case either Installation opening for the exhaust pipe are provided or the exhaust pipe in the Melting core are poured in, so that their position in the interior of the intake manifold is defined. Of course, the invention can also be used in suction pipes made of metal, e.g. B. aluminum.

Vorteilhafterweise lässt sich die Geometrie der Abgasleitung im Saugrohr derart gestalten, dass der durch das Abgas zurückgelegte Weg von dem jeweiligen Anschluss zur jeweiligen Zuführöffnung zu den Saugkanälen immer gleich lang ist. Hierdurch werden die Totzeiten synchronisiert, die zwischen Öffnen des Abgasrückführventils und Einleitung des Abgases in die Saugkanäle entstehen. Außerdem wird auf diese Weise eine gleich starke Abkühlung des Abgases bis zu den einzelnen Einleitstellen erreicht. Die Vergleichmäßigung dieser Effekte führt zu einer optimalen Schadstoffreduzierung durch die Abgasrückführung. Weiterhin wird einer eventuellen Reduzierung des Motordrehmomentes entgegengewirkt, die durch einen Kurzschluss, bewirkt durch die Abgasrückführleitungen, entstehen könnte. Die Länge der Leitungen wirkt demals Drossel entgegen.The geometry of the exhaust pipe in the intake manifold can advantageously be made in this way design that the path covered by the exhaust gas from the respective connection to the respective feed opening to the suction channels is always the same length. This synchronizes the dead times between opening the exhaust gas recirculation valve and introduction of the exhaust gas into the suction channels. Besides, will In this way, the exhaust gas is cooled to the same extent as the individual inlet points reached. The equalization of these effects leads to an optimal one Pollutant reduction through exhaust gas recirculation. Furthermore, a possible Reduction of engine torque counteracted by a short circuit, caused by the exhaust gas recirculation lines, could arise. The length of the Lines counteracts this as a choke.

Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei der Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird.These and other features of preferred developments of the invention go not only from the claims but also from the description and the drawings, the individual features each individually or in groups in the form of sub-combinations in the embodiment of the invention and on others Areas to be realized and advantageous as well as protectable designs can represent, for which protection is claimed here.

Zeichnungdrawing

Weitere Einzelheiten der Erfindung werden in den Zeichnungen anhand von schematischen Ausführungsbeispielen beschrieben. Hierbei zeigen

Figur 1
die teilweise geschnitten dargestellte Aufsicht auf ein Saugrohr für eine Brennkraftmaschine mit V-förmiger Zylinderanordnung in Mehrschalentechnik, wobei die Deckelschale abgenommen ist,
Figur 2
den Schnitt A - A gemäß Figur 1,
Figur 3
den Schnitt B - B gemäß Figur 1, wobei entsprechend Figur 2 zwei Varianten für die Abgasleitung dargestellt sind und
Figur 4 u. 5
Varianten des Details X gemäß Figur 2,
Figur 6
zwei Varianten für eine im Sammelraum eines aufgeschnitten dargestellten Saugrohres eingebaute Abgasrückführleitung.
Further details of the invention are described in the drawings using schematic exemplary embodiments. Show here
Figure 1
the partially sectioned view of an intake manifold for an internal combustion engine with a V-shaped cylinder arrangement in multi-shell technology, the cover shell being removed,
Figure 2
the section A - A according to Figure 1,
Figure 3
the section B - B according to Figure 1, two variants for the exhaust pipe are shown according to Figure 2 and
Figure 4 u. 5
Variants of the detail X according to FIG. 2,
Figure 6
two variants for an exhaust gas recirculation line installed in the collecting space of a cut-open suction pipe.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die Figur 1 gewährt einen Einblick in eine Unterschale 10 eines Ansaugrohres. Es ist zu erkennen, wie die Ansaugluft ensprechend der Pfeile von einem Einlass 11 über zwei Sammelräume 12 zu Ansaugöffnungen 13 von Saugkanälen 14 gelangt, die zu nicht dargestellten Auslässen eines Zylinderkopfflansches 15 führen.FIG. 1 provides an insight into a lower shell 10 of an intake pipe. It is to recognize how the intake air according to the arrows from an inlet 11 on two collecting spaces 12 reaches suction openings 13 of suction channels 14, which lead to Outlets of a cylinder head flange 15, not shown.

Von einem Anschluss 16 führt eine Abgasleitung 17a, b, die in Figur 1 in zwei Varianten dargestellt ist, zu Zuführöffnungen 18a, b, welche die Einleitung des Abgases im Bereich der Saugkanäle erlaubt. Die Abgasleitung 17a ist mit Hilfe einer Schnappverbindung 19 an Wandungen 20 des Saugrohrs befestigt. Dadurch wird ein Mindestabstand a zwischen Wandung 20 und Abgasleitung 17a eingehalten, welcher zu einem thermischen Schutz der Wandung 20 beiträgt. Die Abgasleitung 17b ist mit Hilfe von Schrauben 21 über Laschen 22 im Saugrohr befestigt.An exhaust pipe 17a, b leads from a connection 16, which is shown in FIG. 1 in two variants is shown, to supply openings 18a, b, which the introduction of the exhaust gas in Area of the suction channels allowed. The exhaust pipe 17a is by means of a snap connection 19 attached to walls 20 of the intake manifold. This creates a minimum distance a observed between wall 20 and exhaust pipe 17a, which leads to a thermal protection of the wall 20 contributes. The exhaust pipe 17b is by means of Screws 21 fastened via tabs 22 in the intake manifold.

Der Aufbau der Abgasleitung 17b kann weiterhin der Figur 2 entnommen werden. Diese ist aus zwei Schalen 23 zusammengesetzt, wodurch der Hohlraum zur Leitung der Abgase entsteht. Die Lasche 22 zur Befestigung der Abgasleitung ist ebenfalls integraler Bestandteil einer der Schalen. Die Zuführöffnung 18b ist in eine Durchführung 24b in der Wandung 20b des entsprechenden Saugkanals 14 eingesteckt. An dieser Stelle erfolgt eine Zumischung zur Ansaugluft, welche zu einem der Auslässe 25 im Zylinderkopfflansch 15 strömt.The structure of the exhaust pipe 17b can also be seen in FIG. 2. This is composed of two shells 23, which creates the cavity for conduction the exhaust gases are created. The tab 22 for attaching the exhaust pipe is also integral part of one of the shells. The feed opening 18b is in a feedthrough 24b inserted in the wall 20b of the corresponding suction channel 14. On at this point there is an admixture to the intake air, which leads to one of the outlets 25 flows in the cylinder head flange 15.

Das Saugrohr ist in Mehrschalentechnik hergestellt und verschweißt. Die Saugkanäle 14 werden in die Unterschale 10 eingeschweißt. Weiterhin müssen eine Resonanzklappe 26 als Verbindung zwischen den beiden Sammelräumen 12 und die Abgasleitung 17b in die Unterschale eingebaut werden. Zuletzt wird eine Oberschale 27 mit der Unterschale 10 verschweißt.The intake manifold is manufactured and welded using multi-shell technology. The suction channels 14 are welded into the lower shell 10. You also need a resonance flap 26 as a connection between the two collecting spaces 12 and the exhaust pipe 17b can be installed in the lower shell. Finally, an upper shell 27 with the lower shell 10 welded.

In Figur 3 ist der Anschluss 16 als Detail im Schnitt dargestellt. Der Anschluss besteht aus einem Rohrstutzen 28, der mit Hilfe eines Befestigungsflansches 29 in einer Durchführung 24 fixiert ist. Eine Abdichtung 30 in Form eines O-Rings ist in der Durchführung untergebracht. Das Rohr mündet auf der einen Seite in einen Schraubstutzen 31, der die Befestigung einer Abgaszuleitung 32 erlaubt und auf der anderen Seite in die Abgasleitung 17a, b (beide Versionen sind dargestellt). Um eine Wärmeleitung in die Unterschale 10 möglichst gering zu halten, ist der Rohrstutzen im Bereich der Durchführung 24 als glockenartiges Hohlprofil 33 ausgeführt.In Figure 3, the connection 16 is shown as a detail in section. The connection exists from a pipe socket 28 which with the aid of a mounting flange 29 in a Implementation 24 is fixed. A seal 30 in the form of an O-ring is in the Implementation housed. The tube ends in a screw socket on one side 31, which allows the attachment of an exhaust pipe 32 and on the other Side in the exhaust pipe 17a, b (both versions are shown). To conduct heat To keep the lower shell 10 as low as possible, the pipe socket is in the area the implementation 24 designed as a bell-shaped hollow profile 33.

Aber auch die Zuführöffnungen 18b in den Durchführungen 24b können derart ausgestaltet sein, dass die Wärmeleitung von der Abgasleitung zur Wandung 20b der Saugkanäle 14 verhindert wird. In Figur 4 ist die Zuführung als Rohrstück 34 ausgebildet, die einen Blechbalg 35 enthält. Auf dieses Rohrstück wird die Abgasleitung 17b aufgesteckt. Das Rohrstück wiederum wird in die Durchführung 24b eingesteckt. Anstelle des Rohrstückes kann auch ein Formstück 36 aus Keramik verwendet werden. Dieses ist frei in seiner Gestaltung. An dessen Ende ist eine Düse 37 ausgebildet, die zu einer gezielten Einleitung des Abgases führt. Diese Düse ist entsprechend der Krümmung des Saugkanals 14 in die Strömungsrichtung der Ansaugluft ausgerichtet. Dadurch wird das Abgas nach der Einleitung sofort mitgerissen und optimal in der Ansaugluft verteilt.However, the feed openings 18b in the bushings 24b can also be designed in this way be that the heat conduction from the exhaust pipe to the wall 20b of the Suction channels 14 is prevented. In Figure 4, the feed is designed as a piece of pipe 34, which contains a bellows 35. The exhaust pipe is on this piece of pipe 17b attached. The pipe section in turn is inserted into the bushing 24b. Instead of the pipe section, a shaped piece 36 made of ceramic can also be used. This is free in its design. A nozzle 37 is formed at the end thereof, which leads to a targeted introduction of the exhaust gas. This nozzle is corresponding the curvature of the suction channel 14 aligned in the flow direction of the intake air. As a result, the exhaust gas is immediately entrained and optimally in after the introduction of the intake air.

In Figur 6 ist ein anderes Beispiel für ein Saugrohr dargestellt, wobei ein Teil des Sammelraumes 12 aufgeschnitten ist, so dass 2 Varianten einer Abgasleitung 17c und 17d sichtbar werden. Diese ist durch den Anschluss 16 und die Schnappverbindung 19 fixiert. Die Zuführöffnungen 18c der einen Varianten münden in beschriebener Weise in die Ansaugöffnungen 13 der Saugkanäle 14. Die Zuführöffnungen 18d sind stöcheometrisch oder regelmäßig auf der Oberfläche der Abgasleitung 17d verteilt und führen so zu einer gleichmäßigen Durchmischung der Ansaugluft mit rückgeführtem Abgas, bevor dieses die Saugkanäle 14 erreicht.FIG. 6 shows another example of a suction pipe, a part of the Collection space 12 is cut open, so that 2 variants of an exhaust pipe 17c and 17d become visible. This is through connection 16 and the snap connection 19 fixed. The feed openings 18c of one variant open into the one described In the suction openings 13 of the suction channels 14. The feed openings 18d are distributed stoichiometrically or regularly on the surface of the exhaust pipe 17d and thus lead to a uniform mixing of the intake air with recirculated Exhaust gas before it reaches the suction channels 14.

Claims (9)

Saugrohr mit einer integrierten Abgasrückführung, enthaltend zumindest einen in einen Sammelraum (12) führenden Einlass (11),
vom Sammelraum zu zylinderseitigen Auslässen (25) führende Saugkanäle (14), einer von einem Anschluss (16) zu Zuführöffnungen (18a, b, c), die jeweils im durch die Saugkanäle (14) beeinflussten Strömungsbereich der Ansaugluft vorgesehen sind, führenden Abgasleitung (17a, b, c)
dadurch gekennzeichnet, dass die Abgasleitung (17a, b) unter Einhaltung eines Abstandes zu Wandungen (20a, b) des Saugrohres in den durch selbiges gebildeten Hohlräumen angeordnet und durch Haltemittel (19, 21, 28, 34, 36) fixiert ist, wobei als Haltemittel zumindest eine Abdichtung (30) einer Durchführung (24) des Anschlusses (16) durch die Wandungen (20a, b) umfasst.Intake pipe with an integrated exhaust gas recirculation, containing at least one inlet (11) leading into a collecting space (12),
exhaust ducts (14) leading from the collecting space to cylinder-side outlets (25), one exhaust gas duct leading from a connection (16) to feed openings (18a, b, c), each of which is provided in the flow area of the intake air influenced by the suction ducts (14) ( 17a, b, c)
characterized in that the exhaust pipe (17a, b) is arranged in the cavities formed by the same and is fixed by holding means (19, 21, 28, 34, 36) while maintaining a distance to walls (20a, b) of the intake pipe, wherein as Holding means comprises at least one seal (30) of a passage (24) of the connection (16) through the walls (20a, b). Saugrohr nach Anspruch 1, dadurch gekennzeichnet, dass die Haltemittel (19, 21, 28, 34, 36) nur eine geringe Wärmeleitung zulassen.Intake pipe according to claim 1, characterized in that the holding means (19, 21, 28, 34, 36) allow only a low heat conduction. Saugrohr nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass Haltemittel vorgesehen sind, die als Zuführöffnung (18a, b, c) dienen und in Durchführungen (24b) in den die Saugkanäle (14) bildenden Wandungen (20b) untergebracht sind.Suction pipe according to claim 1 or 2, characterized in that holding means are provided which serve as a feed opening (18a, b, c) and are accommodated in passages (24b) in the walls (20b) forming the suction channels (14). Saugrohr nach Anspruch 3, dadurch gekennzeichnet, dass die Haltemittel aus balgartigen Rohrstücken (34) bestehen, die die Durchleitung des Abgases erlauben und in die Durchführungen (24b) in den die Saugkanäle (14) bildenden Wandungen (20b) eingesetzt sind.Intake pipe according to claim 3, characterized in that the holding means consist of bellows-like pipe pieces (34) which allow the exhaust gas to be passed through and are inserted into the passages (24b) in the walls (20b) forming the suction channels (14). Saugrohr nach Anspruch 3, dadurch gekennzeichnet, dass die Haltemittel aus keramischen Formstücken (36) bestehen, die die Durchleitung des Abgases erlauben und in die Durchführungen (24b) in den die Saugkanäle (14) bildenden Wandungen (20b) eingesetzt sind. Intake pipe according to claim 3, characterized in that the holding means consist of ceramic shaped pieces (36) which allow the exhaust gas to pass through and are inserted into the passages (24b) in the walls (20b) forming the suction channels (14). Saugrohr nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Zuführöffnungen (18a, b) im Bereich von in den Sammelraum mündenden Ansaugöffnungen (13) der Saugkanäle (14) angeordnet sind.Suction pipe according to one of claims 1 or 2, characterized in that the feed openings (18a, b) are arranged in the region of suction openings (13) of the suction channels (14) opening into the collecting space. Saugrohr nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Abgasleitung (17a, b) zumindest teilweise mehrschalig ausgebildet ist, wobei der Querschnitt der Abgasleitung durch die Schalen (23) gebildet ist.Intake pipe according to one of the preceding claims, characterized in that the exhaust pipe (17a, b) is at least partially multi-shell, the cross section of the exhaust pipe being formed by the shells (23). Saugrohr nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Abgasleitung (17a, b) derart verzweigt ist, dass der durch das Abgas zurückzulegende Weg von dem mindestens einen Anschluß (16) zu den Zuführöffnungen (18a, b) im wesentlichen gleich lang ist.Intake pipe according to one of the preceding claims, characterized in that the exhaust gas line (17a, b) is branched in such a way that the path to be covered by the exhaust gas from the at least one connection (16) to the feed openings (18a, b) is essentially of the same length . Saugrohr mit einer integrierten Abgasrückführung, enthaltend zumindest einen in einen Sammelraum (12) führenden Einlass (11),
vom Sammelraum zu zylinderseitigen Auslässen (25) führende Saugkanäle (14), einer von einem Anschluss (16) zu Zuführöffnungen (18d), die jeweils in den Sammelraum münden, führenden Abgasleitung (17d)
dadurch gekennzeichnet, dass die Abgasleitung (17d) unter Einhaltung eines Abstandes zu Wandungen (20a, b) des Saugrohres imSammelraum desselben und durch Haltemittel (19, 21, 28, 34, 36) fixiert ist, wobei als Haltemittel zumindest eine Abdichtung (30) einer Durchführung (24) des Anschlusses (16) durch die Wandungen (20a, b) umfasst und dass die Zuführöffnungen (18d) derart angeordnet sind, dass im durch die Saugkanäle (14) beeinflussten Strömungsbereich der Ansaugluft ein homogenes Gemisch mit dem Abgas mit einer im wesentlichen gleichmäßigen Konzentration des Abgases in der Ansaugluft gewährleistet ist.Intake pipe with an integrated exhaust gas recirculation, containing at least one inlet (11) leading into a collecting space (12),
Suction ducts (14) leading from the collecting space to cylinder-side outlets (25), one exhaust gas line (17d) leading from a connection (16) to feed openings (18d), each of which opens into the collecting space.
characterized in that the exhaust pipe (17d) is fixed in the collecting space of the suction pipe while maintaining a distance from the walls (20a, b) of the suction pipe and by means of holding means (19, 21, 28, 34, 36), at least one seal (30) being used as the holding means of a passage (24) of the connection (16) through the walls (20a, b) and that the feed openings (18d) are arranged in such a way that in the flow area of the intake air influenced by the suction channels (14) a homogeneous mixture with the exhaust gas with a essentially uniform concentration of the exhaust gas in the intake air is guaranteed.
EP01100348A 2000-02-02 2001-01-05 Intake conduit with integrated exhaust gas recirculation Expired - Lifetime EP1122421B1 (en)

Applications Claiming Priority (2)

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DE10004552 2000-02-02
DE10004552A DE10004552A1 (en) 2000-02-02 2000-02-02 Intake pipe with integrated exhaust gas recirculation

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EP1122421A2 true EP1122421A2 (en) 2001-08-08
EP1122421A3 EP1122421A3 (en) 2002-06-12
EP1122421B1 EP1122421B1 (en) 2009-08-19

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EP (1) EP1122421B1 (en)
JP (1) JP2001241367A (en)
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DE (2) DE10004552A1 (en)

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CN109209697A (en) * 2017-07-05 2019-01-15 本田技研工业株式会社 Inlet manifold
CN109209697B (en) * 2017-07-05 2020-01-21 本田技研工业株式会社 Air intake manifold
CN111502834A (en) * 2019-01-22 2020-08-07 通用汽车环球科技运作有限责任公司 Controlling one or more Intake Manifold Tuning Valves (IMTV) in an internal combustion engine

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DE10004552A1 (en) 2001-08-09
ATE440214T1 (en) 2009-09-15
DE50115043D1 (en) 2009-10-01
JP2001241367A (en) 2001-09-07
US20010025632A1 (en) 2001-10-04
EP1122421B1 (en) 2009-08-19
US6422221B2 (en) 2002-07-23
EP1122421A3 (en) 2002-06-12

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