EP1269004A2 - Device for recirculating the exhaust gas of an internal combustion engine - Google Patents

Device for recirculating the exhaust gas of an internal combustion engine

Info

Publication number
EP1269004A2
EP1269004A2 EP00929479A EP00929479A EP1269004A2 EP 1269004 A2 EP1269004 A2 EP 1269004A2 EP 00929479 A EP00929479 A EP 00929479A EP 00929479 A EP00929479 A EP 00929479A EP 1269004 A2 EP1269004 A2 EP 1269004A2
Authority
EP
European Patent Office
Prior art keywords
valve
exhaust gas
exhaust
internal combustion
combustion engine
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
EP00929479A
Other languages
German (de)
French (fr)
Other versions
EP1269004B1 (en
Inventor
Franz Bender
Jürgen HUTER
Rüdiger Pfaff
Joachim Wiltschka
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.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1269004A2 publication Critical patent/EP1269004A2/en
Application granted granted Critical
Publication of EP1269004B1 publication Critical patent/EP1269004B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings
    • F02M26/73—Housings with means for heating or cooling the EGR valve
    • 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
    • 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
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/68—Closing members; Valve seats; Flow passages
    • 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
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the invention relates to a device for returning the exhaust gas of an internal combustion engine of the handle in Oberbe ⁇ of claim 1 near the kind defined.
  • a device of the type mentioned is described in DE 196 37 078 AI.
  • a bushing attachment is provided on the valve rod, by means of which the valve guide is to be protected against heat radiation and contamination.
  • the effectiveness of the socket approach is limited.
  • DE 44 24 644 Cl also describes an exhaust gas recirculation valve with an exhaust gas-guiding valve sleeve arranged in an intake duct, the valve sleeve being enclosed by a flange with good heat conductivity, through which good heat dissipation of the hot exhaust gas is to be achieved, so that more cost-effective Plastic injection parts can be used for exhaust gas recirculation.
  • the exhaust gas valve should be arranged as close as possible to the exit area of the exhaust gases from the internal combustion engine, so that there is no deposition due to cooled exhaust gases due to coking of exhaust gas particles.
  • CONFIRMATION COPY that affect the valve function.
  • the high exhaust gas temperatures that prevent coking require correspondingly heat-resistant and therefore cost-intensive components.
  • the valve housing with the exhaust valve has an intermediate position, i.e. m arranged at a distance from the internal combustion engine, by means of which the problems resulting from an exhaust gas temperature which is too low and too high can be mastered to some extent satisfactorily.
  • the present invention is based on the object of providing a device of the type mentioned at the outset by which higher exhaust gas temperatures, by means of which coking or lacquer formation by the exhaust gas are avoided, at the same time, despite the higher exhaust gas temperature, no problems with respect to the other components occur.
  • the at least one coolant channel which in an advantageous embodiment of the invention is connected to the coolant system of the internal combustion engine, enables an effective reduction in the valve housing temperature to be achieved. In this way, the actuating device in particular can be protected from high temperatures. This is particularly the case if, in an embodiment according to the invention, in the case of an exhaust gas valve which m the valve housing m a valve guide surrounding the valve stem. tion is stored, the coolant channel at least partially, but preferably annularly, surrounds the valve guide.
  • the space m in the valve housing m can be used particularly advantageously as a coolant channel without the valve housing being increased in size.
  • an exhaust gas collecting space can be arranged behind the valve plate, from which the exhaust gas return line branches off.
  • the exhaust gas collecting space in particular in the case of a spherical shape, can be designed in such a way that there are lower throughflow losses, which means that there are only slight frictional losses for the exhaust gas return line.
  • the exhaust gas pressure line is connected in the form of a funnel to the spherical exhaust gas collecting space. In this way, an edge-free and therefore low-friction flow pattern is achieved.
  • a further very advantageous embodiment of the invention can consist in that the valve seat of the exhaust gas valve has a step contour in such a way that when the valve is opened, at least two different openings result in smaller opening angles at the beginning of the opening.
  • a smaller opening angle at the beginning of the exhaust gas recirculation means that a significantly better control and thus a metered exhaust gas recirculation can be achieved with a corresponding sensitivity.
  • FIG. 1 shows a longitudinal section along the line I-I of FIG. 2 through a valve housing of an exhaust gas recirculation valve
  • FIG. 2 shows a longitudinal section along the line II-II of FIG. 1 through a valve housing of an exhaust gas recirculation valve
  • FIG. 3 shows a section along the line III-III of FIG. 2 through a valve housing of an exhaust gas recirculation valve
  • Fig. 4 is a perspective view of the valve housing
  • Fig. 5 is an enlarged view of the valve seat and the lower region of the valve.
  • an exhaust gas valve 2 with a valve stem 3 and a valve disk 4 is mounted at the front end m of a valve guide 5 surrounding the valve stem 3.
  • the valve plate 4 of the valve 2 works with a valve seat 6 designed in the valve housing 1. together, which is formed by an insertion sleeve 7.
  • the shape of the insertion sleeve 7 (only shown in FIG. 1) is discussed in more detail below.
  • Exhaust gas from the outlet area of an internal combustion engine flows in a direction A into the valve housing 1, it reaching a spherical exhaust gas collection space 8 when the valve 2 is open.
  • An exhaust gas pressure line 9 branches off from the exhaust gas collection space 8 from the exhaust gas collection space 8.
  • the exhaust gas pressure line 9 has a funnel shape, which is attached to the outside of the circumferential wall in the center plane of the sphere, so that there is a low-friction outflow from the exhaust gas collecting space 8.
  • a cover cap 10 is arranged on the valve stem 3.
  • the position of the cover cap 10, which follows the movements of the exhaust gas valve 2, is selected such that its underside is at least approximately flush with the wall area of the exhaust gas collection space 8 at this point when the valve is open, as shown in FIG. 1, or so that there is a stepless continuation of the wall contour of the exhaust gas plenum and flow losses due to protruding edges or recesses are avoided.
  • valve housing 1 is provided in the region of the valve guide 5 with a coolant channel 11 which surrounds the valve guide 5 in an annular manner.
  • the inlet to the coolant channel 11 takes place via a connecting piece 12.
  • the connecting piece 12 is connected to the cooling system of the internal combustion engine in a manner not shown in the same way as a return, not shown.
  • FIG. 1 only schematically shown actuation devices 14 for the exhaust valve 2 are arranged.
  • the receiving space 13 for the actuating device 14 is reliably protected against the high temperatures of the exhaust gas entering the valve housing 1 by the intermediate coolant channel 11.
  • the valve housing 1 can be arranged very close to the internal combustion engine or optionally flanged to the internal combustion engine via a mounting flange 18, so that the exhaust gas temperature in the valve housing 1 is still so high that there are no deposits on the valve stem and thus can lead to impairment of the valve function.
  • no high actuation forces are required to open and close the exhaust valve 2, which is why the actuation device 14 can be designed correspondingly more cost-effectively.
  • the valve seat 6 or the plug-in sleeve 7 forming the valve seat has a step contour.
  • a first stage 15 is adapted in its course to the peripheral wall of the valve plate 4 so that there is a closed position and thus a shut-off of the exhaust gas collecting space 8.
  • a second stage 16 - running in the opening direction of the exhaust valve 2 - there is a smaller opening angle than in a third stage 17, in which the exhaust valve 2 is fully open.
  • the opening angle of the second stage 16 can e.g. 15 ° with respect to the longitudinal axis of the exhaust valve 2 and the opening angle of the third stage e.g. 40 ° with respect to the longitudinal axis of the exhaust valve 2.
  • the two stages 16 and 17 with their different opening angles allow particularly sensitive regulation of the amount of recirculated exhaust gas, in particular in the case of a partial opening.
  • an alternative or additional heat dissipation from the valve housing by creating thermal bridges from this to surrounding components, for example through contact surfaces.
  • These can be formed by a mounting flange which is enlarged compared to the mounting flange 18 according to FIG. 1 and which (over a large area) bears against counter surfaces of the motor housing or is pressed against it.
  • the arrangement of the contact surfaces in the region of cooled counter surfaces of the engine housing, for example those of the cylinder head, is particularly advantageous.
  • the heat generated in the exhaust gas recirculation valve can be released to the surroundings via cooling fins. These are preferably arranged on the outside of the housing in the region of the exhaust gas collection space 8 and / or the coolant channel 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Details Of Valves (AREA)
  • Lift Valve (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a device for recirculating the exhaust gas of an internal combustion engine via an exhaust line in the intake area thereof. The inventive device is provided with an exhaust valve which is arranged in a valve housing and which closes or opens the connection from a combustion chamber of the internal combustion engine to the exhaust gas return line. The inventive device also comprises a valve actuating device arranged in the valve housing. Said valve housing is provided with at least one coolant channel.

Description

Vorrichtung zur Rückführung des Abgases einer Brennkraft- maschine Device for recycling the exhaust gas of an internal combustion engine
Die Erfindung betrifft eine Vorrichtung zur Rückführung des Abgases einer Brennkraftmaschine nach der im Oberbe¬ griff von Anspruch 1 naher definierten Art.The invention relates to a device for returning the exhaust gas of an internal combustion engine of the handle in Oberbe ¬ of claim 1 near the kind defined.
Eine Vorrichtung der eingangs erwähnten Art ist m der DE 196 37 078 AI beschrieben. Zur Vermeidung einer Verrußung des Ventilschaftes bzw. Ventilstange und der Ventilstan- genfuhrung ist ein Buchsenansatz auf der Ventilstange vorgesehen, durch den die Ventilfuhrung vor Wärmestrahlung und Verschmutzung geschützt werden soll. Die Wirksamkeit des Buchsenansatzes ist jedoch beschrankt.A device of the type mentioned is described in DE 196 37 078 AI. To avoid sooting of the valve stem or valve rod and the valve rod guide, a bushing attachment is provided on the valve rod, by means of which the valve guide is to be protected against heat radiation and contamination. However, the effectiveness of the socket approach is limited.
Aus der DE 44 24 644 Cl ist ebenfalls ein Abgasruckfuh- rungsventil mit einer m einem Ansaugkanal angeordneten abgasfuhrenden Ventilhulse beschrieben, wobei die Ventil- hulse von einem gut warmeleitfahigen Flansch umschlossen wird, durch den eine gute Wärmeableitung des heißen Abgases erreicht werden soll, damit konstengunstigere Kunststoffspritzteile für die Abgasruckfuhrung verwendet werden können.DE 44 24 644 Cl also describes an exhaust gas recirculation valve with an exhaust gas-guiding valve sleeve arranged in an intake duct, the valve sleeve being enclosed by a flange with good heat conductivity, through which good heat dissipation of the hot exhaust gas is to be achieved, so that more cost-effective Plastic injection parts can be used for exhaust gas recirculation.
Wie aus dem Stand der Technik ersichtlich, besteht bei Vorrichtungen der eingangs erwähnten Art ein Temperaturproblem. Einerseits sollte das Abgasventil möglichst nahe im Ausgangsbereich der Abgase aus der Brennkraftmaschine angeordnet sein, damit es nicht durch abgek hlte Abgase zu Ablagerung durch eine Verkokung von Abgaspartikeln kommt,As can be seen from the prior art, there is a temperature problem in devices of the type mentioned at the outset. On the one hand, the exhaust gas valve should be arranged as close as possible to the exit area of the exhaust gases from the internal combustion engine, so that there is no deposition due to cooled exhaust gases due to coking of exhaust gas particles.
BESTATIGUNGSKOPIE die die Ventilfunktion beeinträchtigen. Andererseits erfordern die hohen, eine Verkokung verhindernden Abgastemperaturen jedoch entsprechend warmeresistente und damit kostenintensive Bauteile. Darüber hinaus besteht bei einer Betätigung des Abgasventiles über eine elektromagnetische Betatigungsemrichtung, die m dem Ventilgehause angeordnet ist, ein Temperaturproblem f r einzelne Bauteile. Aufgrund der Verkokungsgefahr müssen auch höhere Betatigungs- krafte vorgesehen werden, die wiederum aufwendigere und teurere Bauteile erfordern.CONFIRMATION COPY that affect the valve function. On the other hand, however, the high exhaust gas temperatures that prevent coking require correspondingly heat-resistant and therefore cost-intensive components. In addition, there is a temperature problem for individual components when the exhaust valve is actuated via an electromagnetic actuation device which is arranged in the valve housing. Due to the risk of coking, higher actuation forces must also be provided, which in turn require more complex and expensive components.
Als Kompromiß hat man deshalb m der Praxis das Ventilgehause mit dem Abgasventil m einer Zwischenstellung, d.h. m einer Entfernung von der Brennkraftmaschine angeordnet, durch die sich die aus einer zu niedrigen und aus einer zu hohen Abgastemperatur ergebenden Probleme m zufriedenstellender Weise einigermaßen beherrschen lassen.As a compromise, therefore, in practice, the valve housing with the exhaust valve has an intermediate position, i.e. m arranged at a distance from the internal combustion engine, by means of which the problems resulting from an exhaust gas temperature which is too low and too high can be mastered to some extent satisfactorily.
Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, eine Vorrichtung der eingangs erwähnten Art zu schaffen, durch die höhere Abgastemperaturen, durch die Verkokungen bzw. Lackbildungen durch das Abgas vermieden werden, möglich werden, gleichzeitig edoch trotz der höheren Abgastemperatur keine Probleme bezüglich der übrigen Bauteile auftreten.The present invention is based on the object of providing a device of the type mentioned at the outset by which higher exhaust gas temperatures, by means of which coking or lacquer formation by the exhaust gas are avoided, at the same time, despite the higher exhaust gas temperature, no problems with respect to the other components occur.
Erfmdungsgemaß wird diese Aufgabe durch die im kennzeichnenden Teil von Anspruch 1 genannten Merkmale gelost.According to the invention, this object is achieved by the features mentioned in the characterizing part of claim 1.
Durch den wenigstens einen Kuhlmittelkanal, der m einer vorteilhaften Ausgestaltung der Erfindung mit dem Kuhlmittelsystem der Brennkraftmaschine verbunden ist, laßt sich eine wirksame Reduzierung der Ventilgehausetemperatur erreichen. Auf diese Weise laßt sich insbesondere die Betatigungsemrichtung vor hohen Temperaturen schützen. Dies ist besonders dann der Fall, wenn m einer erfmdungsgema- ßen Ausgestaltung bei einem Abgasventil, das m dem Ventilgehause m einer den Ventilschaft umgebenden Ventilfuh- rung gelagert ist, der Kuhlmittelkanal die Ventilfuhrung wenigstens teilweise, vorzugsweise jedoch ringförmig, umschließt .The at least one coolant channel, which in an advantageous embodiment of the invention is connected to the coolant system of the internal combustion engine, enables an effective reduction in the valve housing temperature to be achieved. In this way, the actuating device in particular can be protected from high temperatures. This is particularly the case if, in an embodiment according to the invention, in the case of an exhaust gas valve which m the valve housing m a valve guide surrounding the valve stem. tion is stored, the coolant channel at least partially, but preferably annularly, surrounds the valve guide.
Da für die Ventilfuhrung zwangsweise eine bestimmte axiale Lange vorhanden ist, kann der Raum m dem Ventilgehause m besonders vorteilhafter Weise als Kuhlmittelkanal verwendet werden, ohne daß es zu einer Baugroßenerhohung des Ventilgehauses kommt.Since a certain axial length is inevitably present for the valve guide, the space m in the valve housing m can be used particularly advantageously as a coolant channel without the valve housing being increased in size.
Bei einer Verbindung des Kuhlmittelkanales mit dem Kuhlmittelsystem der Brennkraftmaschine ergibt sich als weiterer Vorteil durch den zusätzlichen Warmeanfall eine zusätzliche Heizleistung für die Heizung eines von der Brennkraftmaschine betriebenen Fahrzeuges. Dies ist insbesondere bei einem Dieselmotor von Vorteil, da dieser insbesondere m der Anfahrtsphase und im Kurzstreckenbetrieb nur wenig Warme für die Fahrzeugheizung erzeugt.When the coolant channel is connected to the coolant system of the internal combustion engine, there is a further advantage of the additional heat accumulation resulting in an additional heating output for heating a vehicle operated by the internal combustion engine. This is particularly advantageous in the case of a diesel engine, since it generates only little heat for the vehicle heating, particularly in the start-up phase and in short-haul operation.
In einer vorteilhaften Ausgestaltung der Erfindung kann hinter dem Vent lteller ein Abgassammeiraum angeordnet sein, von dem aus die Abgasruckleitung abzweigt.In an advantageous embodiment of the invention, an exhaust gas collecting space can be arranged behind the valve plate, from which the exhaust gas return line branches off.
Der Abgassammelräum kann, insbesondere bei einer Kugelform, so ausgestaltet sein, daß sich geringere Durchstromverluste ergeben, womit sich f r die Abgasruckleitung nur geringe Reibungsverluste ergeben.The exhaust gas collecting space, in particular in the case of a spherical shape, can be designed in such a way that there are lower throughflow losses, which means that there are only slight frictional losses for the exhaust gas return line.
Eine weitere Möglichkeit geringe Durchstromungsverluste zu erzeugen liegt darin, daß die Abgasruckleitung m Form eines Trichters an den kugelförmigen Abgassammelräum angeschlossen ist. Auf diese Weise wird ein kantenfreier und damit reibungsarmer Stromungsverlauf erzielt.Another possibility of generating low flow losses is that the exhaust gas pressure line is connected in the form of a funnel to the spherical exhaust gas collecting space. In this way, an edge-free and therefore low-friction flow pattern is achieved.
Eine weitere sehr vorteilhafte Ausgestaltung der Erfindung kann darin bestehen, daß der Ventilsitz des Abgasventiles eine Stufenkontur der Art aufweist, daß sich beim Offnen des Ventils wenigstens zwei unterschiedliche Offnungswm- kel ergeben, wobei sich zu Offnungsbegmn kleinere Off- nungswmkel einstellen.A further very advantageous embodiment of the invention can consist in that the valve seat of the exhaust gas valve has a step contour in such a way that when the valve is opened, at least two different openings result in smaller opening angles at the beginning of the opening.
Durch einen kleineren Offnungswmkel zu Beginn der Abgas- ruckfuhrung laßt sich eine deutlich bessere Regelung und damit eine dosierte Abgasruckfuhrung mit einer entsprechenden Femfuhligkeit erreichen.A smaller opening angle at the beginning of the exhaust gas recirculation means that a significantly better control and thus a metered exhaust gas recirculation can be achieved with a corresponding sensitivity.
Weitere vorteilhafte Ausgestaltungen und Weiterbildungen ergeben sich aus den übrigen Unteranspruchen aus dem nachfolgend anhand der Zeichnung prinzipmaßig beschriebenen Ausfuhrungsbeispiel .Further advantageous refinements and developments result from the remaining subclaims from the exemplary embodiment described in principle below with reference to the drawing.
Es zeigt:It shows:
Fig. 1 einen Längsschnitt nach der Linie I-I der Fig. 2 durch ein Ventilgehauses eines Abgasruckfuhrventi- les,1 shows a longitudinal section along the line I-I of FIG. 2 through a valve housing of an exhaust gas recirculation valve,
Fig. 2 einen Längsschnitt nach der Linie II-II der Fig. 1 durch ein Ventilgehause eines Abgasruckfuhrventi- les,2 shows a longitudinal section along the line II-II of FIG. 1 through a valve housing of an exhaust gas recirculation valve,
Fig. 3 einen Schnitt nach der Linie III-III der Fig. 2 durch ein Ventilgehause eines Abgasruckfuhrventi- les,3 shows a section along the line III-III of FIG. 2 through a valve housing of an exhaust gas recirculation valve,
Fig. 4 eine perspektivische Ansicht des Ventilgehauses, undFig. 4 is a perspective view of the valve housing, and
Fig. 5 eine vergrößerte Darstellung des Ventilsitzes und des unteren Bereiches des Ventiles.Fig. 5 is an enlarged view of the valve seat and the lower region of the valve.
In einem Ventilgehause 1 ist ein Abgasventil 2 mit einem Ventilschaft 3 und einem Ventilteller 4 am vorderen Ende m einer den Ventilschaft 3 umgebenden Ventilfuhrung 5 gelagert. Der Ventilteller 4 des Ventiles 2 arbeitet mit einem m dem Ventilgehause 1 ausgebildeten Ventilsitz 6 zu- sammen, der durch eine Einsteckhülse 7 gebildet ist. Auf die Form der Einsteckhülse 7 (nur in Fig. 1 dargestellt) wird nachfolgend näher eingegangen.In a valve housing 1, an exhaust gas valve 2 with a valve stem 3 and a valve disk 4 is mounted at the front end m of a valve guide 5 surrounding the valve stem 3. The valve plate 4 of the valve 2 works with a valve seat 6 designed in the valve housing 1. together, which is formed by an insertion sleeve 7. The shape of the insertion sleeve 7 (only shown in FIG. 1) is discussed in more detail below.
Abgas aus dem Auslaßbereich einer nicht dargestellten Brennkraftmaschine strömt in einer Richtung A in das Ventilgehäuse 1 ein, wobei es bei Offenstellung des Ventiles 2 in einen kugelförmigen Abgassammeiraum 8 gelangt. Von dem Abgassammelraum 8 aus zweigt eine Abgasruckleitung 9 aus dem Abgassammelraum 8 ab. Die Abgasruckleitung 9 weist dabei eine Trichterform auf, die in der Kugelmittenebene an deren Umfangswand außen angesetzt ist, womit eine reibungsarme Abströmung aus dem Abgassammelraum 8 gegeben ist.Exhaust gas from the outlet area of an internal combustion engine (not shown) flows in a direction A into the valve housing 1, it reaching a spherical exhaust gas collection space 8 when the valve 2 is open. An exhaust gas pressure line 9 branches off from the exhaust gas collection space 8 from the exhaust gas collection space 8. The exhaust gas pressure line 9 has a funnel shape, which is attached to the outside of the circumferential wall in the center plane of the sphere, so that there is a low-friction outflow from the exhaust gas collecting space 8.
Wie aus dem aus Übersichtlichkeitsgründen nur in der Fig. 1 dargestellten Abgasventil ersichtlich ist, ist auf dem Ventilschaft 3 eine Abdeckkappe 10 angeordnet. Die Lage der Abdeckkappe 10, welche den Bewegungen des Abgasventiles 2 folgt, ist so gewählt, daß deren Unterseite bei geöffnetem Ventil - wie es in der Fig. 1 dargestellt ist - wenigstens annähernd bündig mit dem Wandbereich des Abgassammeiraumes 8 an dieser Stelle ist bzw. damit sich eine stufenfreie Fortsetzung der Wandkontur des Abgassammelrau- mes einstellt und damit Strömungsverluste durch vorstehen¬ de Kanten oder Rücksprünge vermieden werden.As can be seen from the exhaust valve shown only in FIG. 1 for reasons of clarity, a cover cap 10 is arranged on the valve stem 3. The position of the cover cap 10, which follows the movements of the exhaust gas valve 2, is selected such that its underside is at least approximately flush with the wall area of the exhaust gas collection space 8 at this point when the valve is open, as shown in FIG. 1, or so that there is a stepless continuation of the wall contour of the exhaust gas plenum and flow losses due to protruding edges or recesses are avoided.
Wie aus den Figuren 1 und 2 ersichtlich ist, ist das Ventilgehäuse 1 im Bereich der Ventilführung 5 mit einem Kühlmittelkanal 11 versehen, der die Ventilführung 5 ringförmig umschließt. Der Zulauf zu dem Kühlmittelkanal 11 erfolgt über einen Anschlußstutzen 12. Der Anschlußstutzen 12 ist in nicht näher dargestellter Weise - ebenso wie ein nicht dargestellter Rücklauf - mit dem Kühlsystem der Brennkraftmaschine verbunden.As can be seen from FIGS. 1 and 2, the valve housing 1 is provided in the region of the valve guide 5 with a coolant channel 11 which surrounds the valve guide 5 in an annular manner. The inlet to the coolant channel 11 takes place via a connecting piece 12. The connecting piece 12 is connected to the cooling system of the internal combustion engine in a manner not shown in the same way as a return, not shown.
In bekannter Weise ist über der Ventilführung 5 bzw. auf der von dem Ventilteller 4 abgewandten Seite des Ventilge- hauses 1 ein Aufnahmeraum 13 angeordnet, in welchem der Fig. 1 nur schematisch dargestellte Betatigungsemnchtun- gen 14 für das Abgasventil 2 angeordnet sind.In a known manner, over the valve guide 5 or on the side of the valve 1, a receiving space 13 is arranged, in which FIG. 1 only schematically shown actuation devices 14 for the exhaust valve 2 are arranged.
Wie ersichtlich, ist der Aufnahmeraum 13 für die Betati- gungsemrichtung 14 durch den dazwischenliegenden Kuhlmittelkanal 11 sicher gegenüber den hohen Temperaturen des m das Ventilgehauses 1 eintretenden Abgases geschützt. Auf diese Weise kann das Ventilgehause 1 sehr nahe an der Brennkraftmaschine angeordnet bzw. gegebenenfalls an der Brennkraftmaschine über einen Befestigungsflansch 18 angeflanscht sein, so daß die Abgastemperatur m dem Ventilgehause 1 noch so hoch ist, daß es zu keinen Ablagerungen an dem Ventilschaft kommen und damit zu einer Beeinträchtigung der Ventilfunktion fuhren kann. Auf diese Weise sind auch keine hohen Betatigungskrafte zum Offnen und Schließen des Abgasventiles 2 erforderlich, weshalb die Betatigungsemrichtung 14 entsprechend kostengünstiger ausgebildet werden kann.As can be seen, the receiving space 13 for the actuating device 14 is reliably protected against the high temperatures of the exhaust gas entering the valve housing 1 by the intermediate coolant channel 11. In this way, the valve housing 1 can be arranged very close to the internal combustion engine or optionally flanged to the internal combustion engine via a mounting flange 18, so that the exhaust gas temperature in the valve housing 1 is still so high that there are no deposits on the valve stem and thus can lead to impairment of the valve function. In this way, no high actuation forces are required to open and close the exhaust valve 2, which is why the actuation device 14 can be designed correspondingly more cost-effectively.
Wie aus der Fig. 5 ersichtlich ist, weist der Ventilsitz 6 bzw. die den Ventilsitz bildende Emsteckhulse 7 eine Stufenkontur auf. Eine erste Stufe 15 ist m ihrem Verlauf der Umfangswand des Ventiltellers 4 so angepaßt, daß sich eine Schließstellung und damit eine Absperrung des Abgassammeiraumes 8 ergibt. In einer zweiten Stufe 16 - m Off- nungsπchtung des Abgasventiles 2 verlaufend - liegt ein geringerer Offnungswmkel vor als m einer dritten Stufe 17, m welcher das Abgasventil 2 voll geöffnet ist. Der Offnungswmkel der zweiten Stufe 16 kann z.B. 15° gegenüber der Längsachse des Abgasventiles 2 und der Offnungs- w kel der dritten Stufe z.B. 40° gegenüber der Langsachse des Abgasventiles 2 betragen. Durch die beiden Stufen 16 und 17 mit ihren unterschiedlichen Offnungswmkeln laßt sich eine besonders feinfühlige Regelung der ruckgefuhrten Abgasmenge, insbesondere bei einer Teiloffnung, erreichen.As can be seen from FIG. 5, the valve seat 6 or the plug-in sleeve 7 forming the valve seat has a step contour. A first stage 15 is adapted in its course to the peripheral wall of the valve plate 4 so that there is a closed position and thus a shut-off of the exhaust gas collecting space 8. In a second stage 16 - running in the opening direction of the exhaust valve 2 - there is a smaller opening angle than in a third stage 17, in which the exhaust valve 2 is fully open. The opening angle of the second stage 16 can e.g. 15 ° with respect to the longitudinal axis of the exhaust valve 2 and the opening angle of the third stage e.g. 40 ° with respect to the longitudinal axis of the exhaust valve 2. The two stages 16 and 17 with their different opening angles allow particularly sensitive regulation of the amount of recirculated exhaust gas, in particular in the case of a partial opening.
Abweichend von den den Figuren dargestellten Ausfuh- rungsbeispielen kann eine alternative oder zusätzliche Wärmeabfuhr vom Ventilgehäuse durch die Schaffung von Wärmebrücken von diesem zu umliegenden Bauteilen erfolgen, beispielsweise durch Kontaktflächen. Diese können durch einen gegenüber dem Befestigungsflansch 18 gemäß Fig. 1 vergrößerten Befestigungsflansch ausgebildet sein, der (groß-) flächig an Gegenflächen des Motorgehäuses anliegt bzw. gegen diese gepreßt wird. Besonders vorteilhaft ist die Anordnung der Kontaktflächen im Bereich von gekühlten Gegenflächen des Motorgehäuses, beispielsweise solchen des Zylinderkopfes .Deviating from the execution shown in the figures Example, an alternative or additional heat dissipation from the valve housing by creating thermal bridges from this to surrounding components, for example through contact surfaces. These can be formed by a mounting flange which is enlarged compared to the mounting flange 18 according to FIG. 1 and which (over a large area) bears against counter surfaces of the motor housing or is pressed against it. The arrangement of the contact surfaces in the region of cooled counter surfaces of the engine housing, for example those of the cylinder head, is particularly advantageous.
Gemäß einer weiteren Ausführungsform kann zusätzlich oder alternativ zu den vorstehend beschriebenen Maßnahmen die im Abgasrückführventil entstehende Wärme über Kühlrippen an die Umgebung abgegeben werden. Diese sind vorzugsweise an der Gehäuseaußenseite im Bereich des Abgassammeiraumes 8 und/oder des Kühlmittelkanals 11 angeordnet. According to a further embodiment, in addition or as an alternative to the measures described above, the heat generated in the exhaust gas recirculation valve can be released to the surroundings via cooling fins. These are preferably arranged on the outside of the housing in the region of the exhaust gas collection space 8 and / or the coolant channel 11.

Claims

Patentansprüche claims
1. Vorrichtung zur Rückführung des Abgases einer Brennkraftmaschine über eine Abgasruckleitung in den Ansaugbereich der Brennkraftmaschine, mit einem in einem Ventilgehäuse angeordneten Abgasventil, das die Verbindung von einem Brennraum der Brennkraftmaschine zu der Abgasruckleitung absperrt oder freigibt, und mit einer in dem Ventilgehäuse angeordneten Ventilbetätigungseinrichtung, dadur ch g e kenn z e i chne t , daß das Ventilgehäuse (1) mit wenigstens einem Kühlmittelkanal (11) versehen ist.1.Device for returning the exhaust gas of an internal combustion engine via an exhaust gas return line into the intake area of the internal combustion engine, with an exhaust valve arranged in a valve housing, which blocks or releases the connection from a combustion chamber of the internal combustion engine to the exhaust gas return line, and with a valve actuating device arranged in the valve housing, That means that the valve housing (1) is provided with at least one coolant channel (11).
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß bei einem Abgasventil (2) , das in dem Ventilgehäuse (1) in einer den Ventilschaft (3) umgebenden Ventilführung (5) gelagert ist, der wenigstens einen Kühlmittelkanal (11) die Ventilführung (5) wenigstens teilweise umgibt.2. Device according to claim 1, characterized in that in an exhaust valve (2) which is mounted in the valve housing (1) in a valve guide (3) surrounding the valve guide (5), the at least one coolant channel (11), the valve guide (5th ) at least partially surrounds.
3. Vorrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t , daß der wenigstens eine Kühlmittelkanal (11) die Ventilführung (5) ringförmig umschließt.3. Apparatus according to claim 2, so that the at least one coolant channel (11) surrounds the valve guide (5) in an annular manner.
Vorrichtung nach einem der Ansprüche 1 bis 3, dadur ch g e kenn z e i chne t , daß der wenigstens eine Kühlmittelkanal (11) mit dem Kühlmittelsystem der Brennkraftmaschine verbunden ist. Device according to one of claims 1 to 3, so that the at least one coolant channel (11) is connected to the coolant system of the internal combustion engine.
. Vorrichtung nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t , daß hinter dem Ventilteller (4) des Abgasventiles (2) ein Abgassammelraum (8) angeordnet ist, an den sich die Abgasruckleitung (9) anschließt.. Device according to one of claims 1 to 4, d a d u r c h g e k e n e z e i c h n e t that behind the valve plate (4) of the exhaust valve (2) an exhaust manifold (8) is arranged, to which the exhaust gas pressure line (9) connects.
6. Vorrichtung nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß der Abgassammelraum (8) wenigstens annähernd eine Kugelform aufweist.6. The device according to claim 5, d a d u r c h g e k e n n z e i c h n e t that the exhaust gas plenum (8) has at least approximately a spherical shape.
7. Vorrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , daß die Abgasruckleitung (9) in Form eines Trichters an den Abgassammelraum (8) angeschlossen ist.7. The device according to claim 6, d a d u r c h g e k e n n z e i c h n e t that the exhaust gas pressure line (9) is connected in the form of a funnel to the exhaust gas collecting space (8).
8. Vorrichtung nach einem der Ansprüche 5 bis 7, d a d u r c h g e k e n n z e i c h n e t , daß auf dem Ventilschaft (3) eine Abdeckkappe (10) angeordnet ist, die bei geöffnetem Abgasventil (2) mit einem Wandbereich des Abgassammeiraumes (8) wenigstens annähernd bündig ist.8. Device according to one of claims 5 to 7, so that a cover cap (10) is arranged on the valve stem (3), which is at least approximately flush with a wall area of the exhaust gas collection space (8) when the exhaust valve (2) is open.
9. Vorrichtung nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , daß der Ventilsitz (6) des -Abgasventiles (2) eine Stufenkontur der Art aufweist, daß sich beim Öffnen des Ventils wenigstens zwei unterschiedliche Öffnungswinkel ergeben, wobei sich zu Öffnungsbeginn kleinere Öffnungswinkel einstellen.9. Device according to one of claims 1 to 8, characterized in that the valve seat (6) of the exhaust gas valve (2) has a step contour such that when opening the valve there are at least two different opening angles, with smaller opening angles being set at the start of opening .
10. Vorrichtung nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , daß der Ventilsitz (6) zwei unterschiedliche Öffnungswinkel ergibt.10. The apparatus of claim 9, d a d u r c h g e k e n n z e i c h n e t that the valve seat (6) results in two different opening angles.
11. Vorrichtung nach Anspruch 10, d a d u r c h g e k e n n z e i c h n e t , daß der erste Offnungswmkel m einem Bereich von ca. 10 bis 20° und der zweite Offnungswmkel m einem Bereich von 30 bis 50° liegt.11. The device according to claim 10, characterized in that the first opening angle is in a range of approximately 10 to 20 ° and the second opening angle is in a range of 30 to 50 °.
12. Vorrichtung nach einem der Ansprüche 9 bis 11, d a d u r c h g e k e n n z e i c h n e t , daß die Stufenkontur des Ventilsitzes (6) durch eine das Ventilgehause (1) eingesetzte Emsteckhulse (7) geschaffen ist.12. The device according to one of claims 9 to 11, that the step contour of the valve seat (6) is created by an insertion sleeve (7) inserted into the valve housing (1).
13. Vorrichtung nach einem der vorhergehenden Ansprüche, dadu r ch g e kenn z e i chn e t , daß das Ventilgehause (1) über Kontaktflachen zur Abfuhr von Warme an ein Motorgehäuse verfugt.13. Device according to one of the preceding claims, that the valve housing (1) has contact surfaces for dissipating heat to an engine housing.
14. Vorrichtung nach Anspruch 13, dadurch gekenn z e i chne t , daß die Kontaktflachen als vergrößerte Flanschflache (18) ausgebildet sind.14. The apparatus according to claim 13, characterized in that the contact surfaces are designed as an enlarged flange surface (18).
15. Vorrichtung nach Anspruch 13 oder 14, dadur ch ge kenn z e i chne t , daß die Kontaktflachen Wirkverbindung mit gekühlten Flachen des Motorgehäuses treten.15. The apparatus of claim 13 or 14, so that ge ge z e i chne t that the contact surfaces effective connection occur with cooled surfaces of the motor housing.
16. Vorrichtung nach einem der vorhergehenden Ansprüche, dadu r ch g e kenn z e i chne t , daß das Ventilgehause (1) über Kuhlrippen verfugt. 16. Device according to one of the preceding claims, that the valve housing (1) has cooling fins.
EP00929479A 1999-05-05 2000-05-03 Device for recirculating the exhaust gas of an internal combustion engine Expired - Lifetime EP1269004B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19920520 1999-05-05
DE19920520A DE19920520C2 (en) 1999-05-05 1999-05-05 Device for recycling the exhaust gas of an internal combustion engine
PCT/EP2000/003960 WO2000068560A2 (en) 1999-05-05 2000-05-03 Device for recirculating the exhaust gas of an internal combustion engine

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EP1269004A2 true EP1269004A2 (en) 2003-01-02
EP1269004B1 EP1269004B1 (en) 2005-07-20

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EP (1) EP1269004B1 (en)
AR (1) AR023834A1 (en)
DE (2) DE19920520C2 (en)
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EP1269004B1 (en) 2005-07-20
DE50010783D1 (en) 2005-08-25
ES2243268T3 (en) 2005-12-01
WO2000068560A3 (en) 2001-04-26
WO2000068560A2 (en) 2000-11-16
AR023834A1 (en) 2002-09-04
DE19920520C2 (en) 2001-04-26
US6631707B1 (en) 2003-10-14
DE19920520A1 (en) 2000-11-16

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