EP0812386B1 - Device for exhaust gas recirculation with a closure member which can be actuated in the intake duct - Google Patents

Device for exhaust gas recirculation with a closure member which can be actuated in the intake duct Download PDF

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Publication number
EP0812386B1
EP0812386B1 EP96933317A EP96933317A EP0812386B1 EP 0812386 B1 EP0812386 B1 EP 0812386B1 EP 96933317 A EP96933317 A EP 96933317A EP 96933317 A EP96933317 A EP 96933317A EP 0812386 B1 EP0812386 B1 EP 0812386B1
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EP
European Patent Office
Prior art keywords
exhaust gas
exhaust
intake duct
gas feed
rotary valve
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Expired - Lifetime
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EP96933317A
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German (de)
French (fr)
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EP0812386A1 (en
Inventor
Hermann Moedinger
Thomas Linke
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • 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
    • F02M26/21—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 with EGR valves located at or near the connection 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors

Definitions

  • the invention relates to a device Exhaust gas recirculation with an actuable in the intake duct Closing element according to the preamble of claim 1.
  • Newer exhaust gas recirculation valves are operated in a controlled manner.
  • the well-known locking plate in Intake duct axially with the help of a pneumatic drive the Moving the opening of the exhaust gas supply duct closed or away.
  • the drive-related elasticity Through the drive-related elasticity, the one acting on the valve disk Exhaust gas pressure and the flow conditions in the intake duct result with a stepless adjustment, especially in part-load operation undesirable inaccuracies with small valve gaps.
  • the subject of the invention is a device for exhaust gas recirculation at on the one hand the exhaust gas feed channel, as well as the adjustment drive in the intake duct is arranged and on the other hand, the valve parts are formed in this way are that minimal of the exhaust gas and fresh gas flow caused forces on the closing element and its drive Act. To this end, it projects approximately perpendicular to the intake duct Fresh gas flow an essentially cylindrical exhaust gas supply pipe as part of an exhaust gas inlet connection, which in has an outlet opening in its cylindrical wall. about the outlet opening is a rotary valve bell as a closing element arranged, which protrudes into the intake duct Exhaust gas supply pipe includes at least in some areas. The rotary valve bell is with an electric swivel motor serving as an adjustment drive coupled.
  • the electric swivel motor is, for example, a so-called electromagnetic one Turntable.
  • the coil winding of this swivel motor is subjected to a pulsating direct current.
  • the resulting torque of the rotor acts against one Return spring.
  • the Coil winding together with an iron yoke and a stator The permanent magnet together with the swivel shaft form the rotor.
  • the pivoting movement of the closing element can also be done with Can be realized with the help of a stepper motor.
  • the closing element or the rotary valve bell is aligned opposite the exhaust gas supply pipe and the exhaust gas supply pipe.
  • the center lines of the exhaust gas supply nozzle and the Rotary vane bell can also be slightly offset in parallel be arranged.
  • An offset that has a small gap in the area the outlet and a large gap on the opposite Generated side of the exhaust gas supply pipe, causes good valve tightness without the risk of the rotary valve bell jammed by dirt in the gap.
  • the exhaust gas recirculation device has a closing element, due to its design only a small amount to operate Force is needed.
  • the bell shape the locking element on the one hand a high security against one vibration excitation from the exhaust system and the other it is shake-proof due to a balanced mass distribution with respect to their swivel axis.
  • Furthermore enables the direct drive has a highly dynamic and precise adjustment behavior.
  • Figure 1 shows an exhaust gas recirculation valve in an intake duct (10) an internal combustion engine is arranged.
  • the intake duct (10) is behind in the direction of the fresh gas flow the exhaust gas is introduced into a throttle valve (1).
  • This is at the Outside wall of the intake duct (10), an exhaust gas supply nozzle (11) arranged on which an exhaust gas feed line, not shown here is flanged.
  • an exhaust gas supply nozzle (11) arranged on which an exhaust gas feed line, not shown here is flanged.
  • the Exhaust gas supply pipe (12) which is also connected to the exhaust gas supply nozzle (11) molded tubular portion a cylindrical outer contour and is with a bottom (13) locked.
  • Part of the exhaust gas supply pipe (12) has a round outlet opening (15).
  • the imaginary center line of the outlet opening (15) runs, for example, parallel to the center line of the intake duct (10).
  • Part of the exhaust gas supply pipe (12) is a pivotable one Rotary vane bell (20) positioned.
  • the pivot axis of the Rotary vane bell (20) corresponds to the center line of the exhaust gas feed pipe (12).
  • the rotary valve bell (20) is a thin-walled in Figure 1 Master cylinder with bottom. On the outside of the bottom is a smaller diameter cylinder concentric with the master cylinder arranged.
  • the master cylinder has one as a rotary valve opening serving bore (21), with the exhaust gas recirculation valve open with the outlet opening (15) for example is congruent. Since the exhaust gas recirculation valve in FIG is shown closed position, the rotary valve opening (21) on the back of the exhaust gas supply pipe (12) and is therefore only drawn in dashed lines.
  • the outlet opening (15) of the exhaust gas supply pipe (12) and the rotary slide valve opening (21) can have different sizes and surfaces have different contours.
  • the cross sections of the openings (15) and (21) can be coordinated with one another, if necessary, that each pivot angle of the rotary valve bell (20) corresponds to a certain opening cross section, so that e.g. With increasing pivoting angle the opening cross section increases.
  • the rotary vane bell (20) can also have several Have openings in the area of the master cylinder. To this For example, different opening cross sections per Realize swivel angle.
  • the bottom of the rotary valve bell (20) can have several recesses or have holes to exhaust gas that is in the gap between the exhaust gas supply pipe (12) and the rotary valve bell (20) pending to let escape.
  • No recesses can affect the rotary valve bell (20) train acting axial force. It also penetrates the edge of the Exhaust gas escaping from the floor is not in the adjustment drive (30) on.
  • a Electric swivel motor (30) used to store and adjust the rotary valve bell (20. It is in a drive housing (31) housed in the form of a tube from the Intake channel (10) protrudes.
  • the drive housing (31) is like this aligned that its center line with the center line of the Hole for receiving the exhaust gas supply pipe (11) matches and at the same time with the center line of the intake duct (10) cuts vertically. Furthermore, the outside facing end face of the drive housing (31) normal to the housing center line aligned.
  • a rotary slide flange (32) is mounted on which is followed by a rotary valve axis (35).
  • the free The end of the rotary valve axis (35) engages in one in the floor (13) of the exhaust gas supply pipe (12) existing bearing bore (16).
  • the rotary valve bell (20) sits with the help of the bearing cylinder on a hollow shaft (36) on the rotary valve axis (35) is double-bearing. That near the rotary valve flange (32) arranged roller bearing (37) is a fixed bearing. If necessary, the drive housing (31) with slight Overpressure to be applied to the rolling bearing before possibly penetrating To protect exhaust gas particles. In addition, before free end of the hollow shaft (36) between the rotary valve bell (20) and the rotary valve axis (35) or the bottom (13) for example, a gap seal can be provided before free end of the hollow shaft (36) between the rotary valve bell (20) and the rotary valve axis (35) or the bottom (13) for example.
  • Coil (41) One sits on the rear part of the hollow shaft (36) Coil (41). Among other things these two components form the rotor of the Electric swivel motor (30). Around the coil (41) is a magnetic stator (42) arranged. It is in one in the rotary valve flange (32) existing annular groove (33) attached.
  • the electric swivel motor (30) has one, not shown Stops, limited swivel range of approx. 90 °.
  • the Closing the exhaust gas recirculation valve causes a spiral spring (44) between the rotary valve flange (32) and the rear end of the hollow shaft (36).
  • the coil spring (44) is on the hollow shaft (36) and on the rotary valve flange (32) attached.
  • a thin-walled, pot-shaped lid (49) is arranged between the drive housing (31) and the stator (42) between the drive housing (31) and the stator (42) a thin-walled, pot-shaped lid (49) is arranged.
  • the Cover (49) is on the outer edge of the rotary valve flange (32) attached ring groove (33) clamped.
  • Internally Wall area of the intake duct (10) is for sealing the transition point between the cover (49) and the drive housing (31) an O-ring is jammed. Between the hollow shaft (36) and the cover (49) there is a gap seal.
  • the electric swivel motor (30) with a equip own housing so that it together with the rotary valve axis (35) and the rotary valve bell (20) a mounting assembly forms.
  • the assembly module can then be attached directly the intake duct (10) are flanged without this one molded drive housing (31) as shown in FIG. 1 needed.
  • the intake duct (10) has a corresponding breakthrough.

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)
  • Electrically Driven Valve-Operating Means (AREA)
  • Characterised By The Charging Evacuation (AREA)

Description

Stand der Technik:State of the art:

Die Erfindung geht von einer Vorrichtung zur Abgasrückführung mit einem im Ansaugkanal betätigbaren Schließelement nach dem Oberbegriff des Anspruchs 1 aus.The invention relates to a device Exhaust gas recirculation with an actuable in the intake duct Closing element according to the preamble of claim 1.

Eine derartige Vorrichtung ist durch die DE-A1-42 27 739 bekannt. Dort wird der Abgaszuführkanal seitlich in den Ansaugkanal hineingeführt und dort z.B. über ein Tellerventil geöffnet oder verschlossen. Der Verschlußteller des Ventils wird dazu im Ansaugkanal auf die jeweilige Öffnung des entsprechenden Abgaszuführkanals aufgelegt oder von diesem abgehoben. Bei dieser Vorrichtung erfolgt der Antrieb zum Verstellen des Verschlußtellers über eine Unterdruckdose. Eine hierzu vergleichbare Vorrichtung ist aus der US-PA 3,901,203 bekannt. Allerdings bewegt dort die Unterdruckdose eine Schwenkklappe. Außerdem sitzt das ganze Abgasrückführventil in einer außerhalb des Ansaugkanals liegenden Abgasleitung. Desweiteren ist in der GB-PS 1 388 032 ebenfalls ein außerhalb des Ansaugkanals gelegenes Abgasrückführventil beschrieben.Such a device is described in DE-A1-42 27 739 known. There, the exhaust gas supply duct is inserted laterally into the Intake duct introduced and there e.g. about a Poppet valve opened or closed. The locking plate the valve is in the intake duct to the respective Opened the corresponding exhaust gas supply channel or lifted off from this. In this device, the Drive for adjusting the locking plate via a Vacuum box. A device comparable to this is known from US-PA 3,901,203. However, that is what moves them there Vacuum can a swivel flap. In addition, the whole thing sits Exhaust gas recirculation valve in an outside of the intake duct lying exhaust pipe. Furthermore, in the GB-PS 1 388 032 also an outside of the intake duct Exhaust gas recirculation valve located.

Neuere Abgasrückführventile werden geregelt betrieben. Dazu wird beispielsweise der bekannte Verschlußteller im Ansaugkanal mit Hilfe eines pneumatischen Antriebs axial auf die Öffnung des Abgaszuführkanals zu- oder wegbewegt. Durch die antriebsbedingte Elastizität, den auf den Ventilteller wirkenden Abgasdruck und die Strömungsbedingungen im Ansaugkanal ergeben sich bei einer stufenlosen Verstellung speziell im Teillastbetrieb bei kleinen Ventilspalten unerwünschte Ungenauigkeiten.Newer exhaust gas recirculation valves are operated in a controlled manner. To For example, the well-known locking plate in Intake duct axially with the help of a pneumatic drive the Moving the opening of the exhaust gas supply duct closed or away. Through the drive-related elasticity, the one acting on the valve disk Exhaust gas pressure and the flow conditions in the intake duct result with a stepless adjustment, especially in part-load operation undesirable inaccuracies with small valve gaps.

Es sind auch aufwendige Konstruktionen bekannt, bei denen der Ventilteller bzw. das Schließglied mit Hilfe eines Getriebemotors bewegt wird.There are also known complex designs in which the Valve plate or the closing member with the help of a gear motor is moved.

Vorteile der Erfindung:Advantages of the invention:

Bei dem Gegenstand der Erfindung handelt es sich um eine Vorrichtung zur Abgasrückführung bei der u.a. zum einen der Abgaszuführkanal, sowie der Verstellantrieb so im Ansaugkanal angeordnet ist und zum anderen die Ventilteile derart ausgebildet sind, daß nur minimale vom Abgas- und Frischgasstrom verursachte Kräfte auf das Schließelement und dessen Antrieb wirken. Dazu ragt in den Ansaugkanal annähernd senkrecht zur Frischgasströmung ein im wesentlichen zylindrisches Abgaszuführrohr als Teil eines Abgaszuführstutzens hinein, das in seiner zylindrischen Wandung eine Auslaßöffnung aufweist. Über der Auslaßöffnung ist als Schließelement eine Drehschieberglocke angeordnet, die das in den Ansaugkanal hereinragende Abgaszuführrohr zumindest bereichsweise umfaßt. Die Drehschieberglocke ist mit einem als Verstellantrieb dienenden Elektroschwenkmotor gekuppelt.The subject of the invention is a device for exhaust gas recirculation at on the one hand the exhaust gas feed channel, as well as the adjustment drive in the intake duct is arranged and on the other hand, the valve parts are formed in this way are that minimal of the exhaust gas and fresh gas flow caused forces on the closing element and its drive Act. To this end, it projects approximately perpendicular to the intake duct Fresh gas flow an essentially cylindrical exhaust gas supply pipe as part of an exhaust gas inlet connection, which in has an outlet opening in its cylindrical wall. about the outlet opening is a rotary valve bell as a closing element arranged, which protrudes into the intake duct Exhaust gas supply pipe includes at least in some areas. The rotary valve bell is with an electric swivel motor serving as an adjustment drive coupled.

Der Elektroschwenkmotor ist beispielsweise ein sog. elektromagnetischer Drehsteller. Die Spulenwicklung dieses Schwenkmotors wird mit einem pulsierenden Gleichstrom beaufschlagt. Das hierbei entstehende Drehmoment des Rotors wirkt gegen eine Rückstellfeder. Bezüglich der Drehstellerbauart kann u.a. die Spulenwicklung zusammen mit einem Eisenjoch den Stator und ein Permanentmagnet zusammen mit der Schwenkwelle den Rotor bilden. Die Schwenkbewegung des Schließelements kann auch mit Hilfe eines Schrittmotors realisiert werden.The electric swivel motor is, for example, a so-called electromagnetic one Turntable. The coil winding of this swivel motor is subjected to a pulsating direct current. The resulting torque of the rotor acts against one Return spring. Regarding the type of turntable, the Coil winding together with an iron yoke and a stator The permanent magnet together with the swivel shaft form the rotor. The pivoting movement of the closing element can also be done with Can be realized with the help of a stepper motor.

Zur Erzeugung einer guten Vermischung von Frisch- und Abgas ist die Auslaßöffnung des in den Ansaugkanal hereinragenden Abgaszuführrohres bezüglich der Strömungsrichtung des Frischgas stromes annähernd quer und hinter dem Abgaszuführrohr angeordnet. Durch diese Anordnung können sich kaum Abgasrückstände im Ventil- oder Drosselklappenbereich ablagern. Bei gekrümmten Ansaugkanälen oder in Kanälen mit anderen Strömungshindernissen kann das Abgas zum Erzielen einer optimalen Durchmischung auch schräg zum Frischgasstrom eingeleitet werden. Dazu kann das Abgaszuführrohr als ein separat in den Abgaszuführstutzen einsteckbares Bauteil schwenkbar montiert sein.To produce a good mixture of fresh and exhaust gas is the outlet opening of the protruding into the intake duct Exhaust gas supply pipe with respect to the flow direction of the fresh gas Stromes arranged approximately transversely and behind the exhaust gas supply pipe. This arrangement means that there are hardly any exhaust gas residues deposit in the valve or throttle valve area. With curved Intake ducts or in ducts with other flow obstacles can the exhaust gas to achieve an optimal Mixing can also be initiated at an angle to the fresh gas flow. For this purpose, the exhaust gas supply pipe can be connected separately to the exhaust gas supply pipe insertable component pivotally mounted his.

In der Regel fluchtet das Schließelement bzw. die Drehschieberglocke gegenüber dem Abgaszuführstutzen und dem Abgaszuführrohr. Die Mittellinien des Abgaszuführstutzens und der Drehschieberglocke können auch geringfügig parallel versetzt angeordnet sein. Ein Versatz, der einen kleinen Spalt im Bereich der Auslaßöffnung und einen großen Spalt auf der gegenüberliegenden Seite des Abgaszuführrohres erzeugt, bewirkt eine gute Ventildichtigkeit ohne die Gefahr, daß die Drehschieberglocke durch Verschmutzungen im Spalt klemmt.As a rule, the closing element or the rotary valve bell is aligned opposite the exhaust gas supply pipe and the exhaust gas supply pipe. The center lines of the exhaust gas supply nozzle and the Rotary vane bell can also be slightly offset in parallel be arranged. An offset that has a small gap in the area the outlet and a large gap on the opposite Generated side of the exhaust gas supply pipe, causes good valve tightness without the risk of the rotary valve bell jammed by dirt in the gap.

Die Vorrichtung zur Abgasrückführung hat ein Schließelement, zu dessen Betätigung aufgrund seiner Gestaltung nur eine geringe Kraft benötigt wird. Ferner besteht durch die Glockenform des Schließelements zum einen eine hohe Sicherheit gegen eine Schwingungsanregung aus dem Abgassystem und zum anderen ist sie durch eine in sich ausgewogene Massenverteilung schüttelsicher gegenüber ihrer Schwenkachse. Des weiteren ermöglicht der Direktantrieb ein hochdynamisches und präzises Verstellverhalten.The exhaust gas recirculation device has a closing element, due to its design only a small amount to operate Force is needed. There is also the bell shape the locking element on the one hand a high security against one vibration excitation from the exhaust system and the other it is shake-proof due to a balanced mass distribution with respect to their swivel axis. Furthermore enables the direct drive has a highly dynamic and precise adjustment behavior.

Zeichnung und Beschreibung des Ausführungsbeispiels:Drawing and description of the embodiment:

Weitere Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer schematisch in Figur 1 dargestellten Ausführungsform.Further details of the invention emerge from the following Description of a schematically shown in Figure 1 Embodiment.

Figur 1 zeigt ein Abgasrückführventil, das in einem Ansaugkanal (10) einer Brennkraftmaschine angeordnet ist. In den Ansaugkanal (10) wird in Richtung der Frischgasströmung hinter einer Drosselklappe (1) das Abgas eingeleitet. Dazu ist an der Außenwand des Ansaugkanals (10) ein Abgaszuführstutzen (11) angeordnet, an dem eine hier nicht dargestellte Abgaszuführleitung angeflanscht ist. Im Abgaszuführstutzen (11) ist beispielsweise ein separates Abgaszuführrohr (12) eingesetzt. Das Abgaszuführrohr (12), das auch ein an den Abgaszuführstutzen (11) angeformter rohrförmiger Abschnitt sein kann, hat eine zylindrische Außenkontur und ist mit einem Boden (13) verschlossen. In dem in den Ansaugkanal (10) hineinragenden Teil hat das Abgaszuführrohr (12) eine runde Auslaßöffnung (15). Die gedachte Mittellinie der Auslaßöffnung (15) verläuft beispielsweise parallel zur Mittellinie des Ansaugkanals (10). Über dem frei in den Ansaugkanal (10) hineinragenden Teil des Abgaszuführrohres (12) ist eine schwenkbare Drehschieberglocke (20) positioniert. Die Schwenkachse der Drehschieberglocke (20) entspricht der Mittellinie des Abgaszuführrohres (12). Figure 1 shows an exhaust gas recirculation valve in an intake duct (10) an internal combustion engine is arranged. In the intake duct (10) is behind in the direction of the fresh gas flow the exhaust gas is introduced into a throttle valve (1). This is at the Outside wall of the intake duct (10), an exhaust gas supply nozzle (11) arranged on which an exhaust gas feed line, not shown here is flanged. In the exhaust gas supply connection (11) is, for example a separate exhaust gas supply pipe (12) is used. The Exhaust gas supply pipe (12), which is also connected to the exhaust gas supply nozzle (11) molded tubular portion a cylindrical outer contour and is with a bottom (13) locked. In the protruding into the intake duct (10) Part of the exhaust gas supply pipe (12) has a round outlet opening (15). The imaginary center line of the outlet opening (15) runs, for example, parallel to the center line of the intake duct (10). Above the one that projects freely into the intake duct (10) Part of the exhaust gas supply pipe (12) is a pivotable one Rotary vane bell (20) positioned. The pivot axis of the Rotary vane bell (20) corresponds to the center line of the exhaust gas feed pipe (12).

Die Drehschieberglocke (20) ist in Figur 1 ein dünnwandiger Hauptzylinder mit Boden. An der Außenseite des Bodens ist ein im Durchmesser kleinerer Lagerzylinder konzentrisch zum Hauptzylinder angeordnet. Der Hauptzylinder hat eine als Drehschieberöffnung dienende Bohrung (21), die bei geöffnetem Abgasrückführventil mit der Auslaßöffnung (15) beispielsweise deckungsgleich ist. Da in Figur 1 das Abgasrückführventil im geschlossenen Zustand dargestellt ist, liegt die Drehschieberöffnung (21) auf der Rückseite des Abgaszuführrohrs (12) und ist somit nur gestrichelt gezeichnet.The rotary valve bell (20) is a thin-walled in Figure 1 Master cylinder with bottom. On the outside of the bottom is a smaller diameter cylinder concentric with the master cylinder arranged. The master cylinder has one as a rotary valve opening serving bore (21), with the exhaust gas recirculation valve open with the outlet opening (15) for example is congruent. Since the exhaust gas recirculation valve in FIG is shown closed position, the rotary valve opening (21) on the back of the exhaust gas supply pipe (12) and is therefore only drawn in dashed lines.

Die Auslaßöffnung (15) des Abgaszuführrohrs (12) und die Drehschieberöffnung (21) können unterschiedlich große Flächen und verschiedene Konturen aufweisen. Die Querschnitte der Öffnungen (15) und (21) lassen sich ggf. so aufeinander abstimmen, daß jedem Schwenkwinkel der Drehschieberglocke (20) ein bestimmter Öffnungsquerschnitt entspricht, so daß z.B. mit wachsendem Schwenkwinkel der Öffnungsquerschnitt zunimmt.The outlet opening (15) of the exhaust gas supply pipe (12) and the rotary slide valve opening (21) can have different sizes and surfaces have different contours. The cross sections of the openings (15) and (21) can be coordinated with one another, if necessary, that each pivot angle of the rotary valve bell (20) corresponds to a certain opening cross section, so that e.g. With increasing pivoting angle the opening cross section increases.

Des weiteren kann die Drehschieberglocke (20) auch mehrere Öffnungen im Bereich des Hauptzylinders aufweisen. Auf diese Weise lassen sich z.B. verschiedene Öffnungsquerschnitte pro Schwenkwinkel realisieren.Furthermore, the rotary vane bell (20) can also have several Have openings in the area of the master cylinder. To this For example, different opening cross sections per Realize swivel angle.

Der Boden der Drehschieberglocke (20) kann mehrere Ausnehmungen oder Bohrungen haben, um Abgas, das im Spaltraum zwischen dem Abgaszuführrohr (12) und der Drehschieberglocke (20) ansteht, entweichen zu lassen. Durch ein Anbringen solcher Ausnehmungen kann sich keine auf die Drehschieberglocke (20) wirkende Axialkraft ausbilden. Außerdem dringt das am Rand des Bodens entweichende Abgas nicht in den Verstellantrieb (30) ein. The bottom of the rotary valve bell (20) can have several recesses or have holes to exhaust gas that is in the gap between the exhaust gas supply pipe (12) and the rotary valve bell (20) pending to let escape. By attaching such No recesses can affect the rotary valve bell (20) train acting axial force. It also penetrates the edge of the Exhaust gas escaping from the floor is not in the adjustment drive (30) on.

Zum Lagern und Verstellen der Drehschieberglocke (20) wird ein Elektroschwenkmotor (30) verwendet. Er ist in einem Antriebsgehäuse (31) untergebracht, das in Form eines Rohres aus dem Ansaugkanal (10) hervorsteht. Das Antriebsgehäuse (31) ist so ausgerichtet, daß seine Mittellinie mit der Mittellinie der Bohrung zur Aufnahme des Abgaszuführstutzens (11) übereinstimmt und sich zugleich mit der Mittellinie des Ansaugkanals (10) senkrecht schneidet. Ferner ist die nach außen weisende Stirnfläche des Antriebsgehäuses (31) normal zur Gehäusemittellinie ausgerichtet.To store and adjust the rotary valve bell (20), a Electric swivel motor (30) used. It is in a drive housing (31) housed in the form of a tube from the Intake channel (10) protrudes. The drive housing (31) is like this aligned that its center line with the center line of the Hole for receiving the exhaust gas supply pipe (11) matches and at the same time with the center line of the intake duct (10) cuts vertically. Furthermore, the outside facing end face of the drive housing (31) normal to the housing center line aligned.

Auf der planen Stirnfläche des rohrförmigen Antriebsgehäuses (31) ist ein Drehschieberflansch (32) montiert, an dem sich eine Drehschieberachse (35) anschließt. Das freie Ende der Drehschieberachse (35) greift in eine im Boden (13) des Abgaszuführrohres (12) vorhandene Lagerbohrung (16) ein. Beim Einbau des Elektroschwenkmotors (30) in den Ansaugkanal (10) wird die Drehschieberachse (35) über den Drehschieberflansch (32) so am Antriebsgehäuse (31) positioniert und angeschraubt, daß sie ohne Verspannen oder Verkanten in die Lagerbohrung (16) des Abgaszuführrohres (12) eingreift.On the flat face of the tubular drive housing (31) a rotary slide flange (32) is mounted on which is followed by a rotary valve axis (35). The free The end of the rotary valve axis (35) engages in one in the floor (13) of the exhaust gas supply pipe (12) existing bearing bore (16). When installing the electric swivel motor (30) in the intake duct (10) becomes the rotary valve axis (35) via the rotary valve flange (32) positioned on the drive housing (31) and screwed on so that it can be tightened or twisted into the Bearing bore (16) of the exhaust gas feed pipe (12) engages.

Die Drehschieberglocke (20) sitzt mit Hilfe des Lagerzylinders auf einer Hohlwelle (36), die auf der Drehschieberachse (35) zweifach wälzgelagert ist. Das in der Nähe des Drehschieberflansches (32) angeordnete Wälzlager (37) ist ein Festlager. Gegebenenfalls kann das Antriebsgehäuse (31) mit geringfügigem Überdruck beaufschlagt werden, um die Wälzlager vor ggf. eindringenden Abgaspartikeln zu schützen. Zusätzlich kann vor dem freien Ende der Hohlwelle (36) zwischen der Drehschieberglocke (20) und der Drehschieberachse (35) oder dem Boden (13) beispielsweise eine Spaltdichtung vorgesehen werden. The rotary valve bell (20) sits with the help of the bearing cylinder on a hollow shaft (36) on the rotary valve axis (35) is double-bearing. That near the rotary valve flange (32) arranged roller bearing (37) is a fixed bearing. If necessary, the drive housing (31) with slight Overpressure to be applied to the rolling bearing before possibly penetrating To protect exhaust gas particles. In addition, before free end of the hollow shaft (36) between the rotary valve bell (20) and the rotary valve axis (35) or the bottom (13) for example, a gap seal can be provided.

Anstelle der beiden Wälzlager können auch Gleitlager oder Kreuzfedergelenke verwendet werden. Letztere sind wärme- und schmutzunempfindlicher.Instead of the two roller bearings, plain bearings or Cross spring joints are used. The latter are heat and less sensitive to dirt.

Auf dem hinteren Teil der Hohlwelle (36) sitzt eine Spule (41). U.a. bilden diese beiden Bauteile den Rotor des Elektroschwenkmotors (30). Um die Spule (41) herum ist ein magnetischer Stator (42) angeordnet. Er ist in einer im Drehschieberflansch (32) vorhandenen Ringnut (33) befestigt.One sits on the rear part of the hollow shaft (36) Coil (41). Among other things these two components form the rotor of the Electric swivel motor (30). Around the coil (41) is a magnetic stator (42) arranged. It is in one in the rotary valve flange (32) existing annular groove (33) attached.

Der Elektroschwenkmotor (30) hat einen, durch nicht dargestellte Anschläge, begrenzten Schwenkbereich von ca. 90°. Das Schließen des Abgasrückführventils bewirkt eine Spiralfeder (44), die zwischen dem Drehschieberflansch (32) und der hinteren Stirnseite der Hohlwelle (36) liegt. Die Spiralfeder (44) ist dazu an der Hohlwelle (36) und am Drehschieberflansch (32) befestigt.The electric swivel motor (30) has one, not shown Stops, limited swivel range of approx. 90 °. The Closing the exhaust gas recirculation valve causes a spiral spring (44) between the rotary valve flange (32) and the rear end of the hollow shaft (36). The coil spring (44) is on the hollow shaft (36) and on the rotary valve flange (32) attached.

Um den Elektroschwenkmotor (30) vor Verunreinigungen zu schützen, ist zwischen dem Antriebsgehäuse (31) und dem Stator (42) ein dünnwandiger, topfförmiger Deckel (49) angeordnet. Der Deckel (49) ist an der äußeren Kante der im Drehschieberflansch (32) angebrachten Ringnut (33) festgeklemmt. Im inneren Wandungsbereich des Ansaugkanals (10) ist zum Abdichten an der Übergangstelle zwischen dem Deckel (49) und dem Antriebsgehäuse (31) ein O-Ring eingeklemmt. Zwischen der Hohlwelle (36) und dem Deckel (49) liegt eine Spaltdichtung.To protect the electric swivel motor (30) from contamination, is between the drive housing (31) and the stator (42) a thin-walled, pot-shaped lid (49) is arranged. The Cover (49) is on the outer edge of the rotary valve flange (32) attached ring groove (33) clamped. Internally Wall area of the intake duct (10) is for sealing the transition point between the cover (49) and the drive housing (31) an O-ring is jammed. Between the hollow shaft (36) and the cover (49) there is a gap seal.

Alternativ zu der bisher beschriebenen Konstruktion besteht auch die Möglichkeit den Elektroschwenkmotor (30) mit einem eigenen Gehäuse auszustatten, so daß er zusammen mit der Drehschieberachse (35) und der Drehschieberglocke (20) eine Montagebaugruppe bildet. Die Montagebaugruppe kann dann direkt an dem Ansaugkanal (10) angeflanscht werden, ohne daß dieser ein wie in Figur 1 gezeigtes, angeformtes Antriebsgehäuse (31) benötigt. Zum Durchstecken der Drehschieberglocke (20) hat dazu der Ansaugkanal (10) einen entsprechenden Durchbruch.As an alternative to the construction described so far also the possibility of the electric swivel motor (30) with a equip own housing so that it together with the rotary valve axis (35) and the rotary valve bell (20) a mounting assembly forms. The assembly module can then be attached directly the intake duct (10) are flanged without this one molded drive housing (31) as shown in FIG. 1 needed. For pushing through the rotary valve bell (20) the intake duct (10) has a corresponding breakthrough.

Bei einem Betrieb der Brennkraftmaschine wird abhängig vom Betriebszustand über das Abgaszuführventil dem Frischgas eine Teilmenge des Abgases beigemengt. Dazu wird bei dem in Figur 1 gezeigten Ausführungbeispiel die Drehschieberglocke (20) gegen die Schließkraft der Spiralfeder (44) durch ein gesteuertes Bestromen der Spule (41) offen gehalten. Eine Öffnungsbewegung erfolgt durch ein Drehung der Drehschieberglocke (20) entgegen dem Uhrzeigersinn.When the internal combustion engine is operating, it depends on the operating state via the exhaust gas supply valve to the fresh gas Part of the exhaust gas added. For this purpose, in FIG shown embodiment the rotary valve bell (20) against the closing force of the coil spring (44) by a controlled Energizing the coil (41) kept open. An opening movement is done by rotating the rotary valve bell (20) clockwise.

Claims (3)

  1. Device for the feedback of exhaust gas, having an exhaust-gas feed duct connected to an intake duct, in which case the exhaust-gas feed duct can be opened and closed in the intake duct via a closing element actuated by an adjusting drive, in which an essentially cylindrical exhaust-gas feed pipe (12), as part of an exhaust-gas feed connection (11), projects into the intake duct (10) approximately perpendicularly to the fresh-gas flow, characterized in that
    the exhaust-gas feed pipe (12) has an outlet opening (15) in its cylindrical wall,
    the closing element is a rotary-valve bell (20), which encloses at least a region of the exhaust-gas feed pipe (12) projecting into the intake duct (10), and
    the rotary-valve bell (20) is coupled to an electric swivel motor (30) serving as adjusting drive.
  2. Device according to Claim 1, characterized in that the outlet opening (15), with regard to the flow direction of the fresh-gas flow, is arranged approximately transversely to and to the rear of the exhaust-gas feed pipe (12).
  3. Device according to Claim 1, characterized in that the imaginary centre lines of the exhaust-gas feed connection (11) and the rotary-valve bell (20) are identical.
EP96933317A 1995-12-29 1996-08-23 Device for exhaust gas recirculation with a closure member which can be actuated in the intake duct Expired - Lifetime EP0812386B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19549107A DE19549107A1 (en) 1995-12-29 1995-12-29 Device for exhaust gas recirculation with a closing element which can be actuated in the intake duct
DE19549107 1995-12-29
PCT/DE1996/001563 WO1997024522A1 (en) 1995-12-29 1996-08-23 Device for exhaust gas recirculation with a closure member which can be actuated in the intake duct

Publications (2)

Publication Number Publication Date
EP0812386A1 EP0812386A1 (en) 1997-12-17
EP0812386B1 true EP0812386B1 (en) 2000-01-05

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EP96933317A Expired - Lifetime EP0812386B1 (en) 1995-12-29 1996-08-23 Device for exhaust gas recirculation with a closure member which can be actuated in the intake duct

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US (1) US5785034A (en)
EP (1) EP0812386B1 (en)
JP (1) JPH11504411A (en)
KR (1) KR19980702578A (en)
DE (2) DE19549107A1 (en)
WO (1) WO1997024522A1 (en)

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Also Published As

Publication number Publication date
EP0812386A1 (en) 1997-12-17
WO1997024522A1 (en) 1997-07-10
US5785034A (en) 1998-07-28
DE19549107A1 (en) 1997-07-03
KR19980702578A (en) 1998-07-15
DE59604117D1 (en) 2000-02-10
JPH11504411A (en) 1999-04-20

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