EP0263368A2 - Idle air control device for internal-combustion engines - Google Patents

Idle air control device for internal-combustion engines Download PDF

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Publication number
EP0263368A2
EP0263368A2 EP87114004A EP87114004A EP0263368A2 EP 0263368 A2 EP0263368 A2 EP 0263368A2 EP 87114004 A EP87114004 A EP 87114004A EP 87114004 A EP87114004 A EP 87114004A EP 0263368 A2 EP0263368 A2 EP 0263368A2
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EP
European Patent Office
Prior art keywords
housing
disc
idle air
chamber
drum
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
EP87114004A
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German (de)
French (fr)
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EP0263368A3 (en
EP0263368B1 (en
Inventor
Heinz Lemberger
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP0263368A2 publication Critical patent/EP0263368A2/en
Publication of EP0263368A3 publication Critical patent/EP0263368A3/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00Idling devices for carburettors
    • F02M3/06Increasing idling speed
    • F02M3/07Increasing idling speed by positioning the throttle flap stop, or by changing the fuel flow cross-sectional area, by electrical, electromechanical or electropneumatic means, according to engine speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00Idling devices for carburettors
    • F02M3/06Increasing idling speed
    • F02M2003/067Increasing idling speed the valve for controlling the cross-section of the conduit being rotatable, but not being a screw-like valve

Definitions

  • the invention relates to a device according to the type specified in the preamble of the main claim.
  • a device of this type is known, for example, from DE-A-33 37 590 and serves to regulate the idle air that is bypassed past a power control element of the internal combustion engine.
  • the idle air flowing past the control edge of the rotary valve causes oil and water-containing deposits on the surfaces facing the chamber of the rotary valve, which form condensates at low ambient temperatures.
  • the rotary valve is formed by means of a tongue-like cylinder section arranged on the outer circumference of the disk which directs the regulated idle air to the outflow connection, the disk being arranged in the housing with circumferential play.
  • This disc arranged with circumferential play essentially forms the separation between a part receiving the rotary slide valve and a part of the chamber of the housing receiving the stepping motor.
  • About the given from the predetermined circumferential clearance between the disc and the housing gap can be less favorable Vehicle operating position Oil and water condensates penetrate the electrical drive of the rotary valve and lead to corrosion and short circuit. It also follows from the above that the use of the device is restricted by prescribed installation positions for preventing the penetration of liquid condensates.
  • the invention has for its object to improve the operational safety of the device described in the preamble of the main claim with simple means.
  • the condensate barrier is implemented by means of a drum which is rotatably arranged in the housing of the device and which is designed on one end face as a flat rotary slide valve for regulating the inflowing idle air.
  • the idle air flows into the drum in the axial direction, the flow processes causing the deposits of the idle air flowing into the interior of the drum being triggered at the control edge facing the interior of the drum.
  • oil and water-containing constituents which have been eliminated from the idle air are deposited on the inside of the drum. Annoying deposits between the front wall of the chamber and the rotary valve are avoided.
  • the drum forms a relative to Housing movable condensate lock, which reliably prevents the penetration of oil and water-containing condensates to the electrical drive part of the device. Furthermore, since the interior of the drum is acted upon by the negative pressure on the motor side, discharge of the condensate is also ensured.
  • the drum can be either made of plastic or coated on the inside with plastic in a further embodiment of the invention. Furthermore, the risk of icing in the air gap arranged between the end wall of the chamber and the flat rotary slide valve is substantially reduced in that this air gap is sucked empty by the negative pressure of the internal combustion engine over a relatively large circumferential gap. The amount of leakage air through this air gap can advantageously be determined by a labyrinth seal between the flat rotary valve and the end wall of the chamber.
  • the drum combining the flat rotary slide valve with the condensate barrier is dimensionally stable even at relatively high ambient temperatures, the air gap and the labyrinth seal can advantageously be matched to one another. A lower radial bearing load is also achieved with the axially flowing idle air. Finally, the installation position of the device according to the invention can be as desired.
  • this can be arranged in a housing-fixed manner according to another construction principle of the invention, with a ring adjacent to the motor-side end face of the disc in the region of between the disc and Housing by the circumferential clearance predetermined annular gap with the housing in a liquid-tight connection.
  • a housing-fixed ring with a conical collar which can be elastically expanded to the respective diameter during assembly of a disc combined with a flat rotary slide valve and limits a predetermined axial gap with the disc.
  • a condensate barrier fixed to the housing is designed as a fixed ring for a conventional rotary slide valve controlling the incoming idle air via a circumferential opening in the chamber, which ring is arranged in a part of a divided housing.
  • a device 1 for regulating the idle air for an internal combustion engine comprises a housing 2 which can be arranged in an idle air line, not shown, with connecting pieces 3 and 4 oriented transversely to one another 3 and 4 controlling rotary valve 6 and an electric stepper motor 7 in the same-axis drive connection.
  • the flat rotary slide valve 6 interacts with an opening 9 arranged in an end wall 8 of the chamber 5, the opening 9 being associated with the axially directed connecting piece 3.
  • the flat rotary slide valve 6 has a control opening 10, by means of which the idle air flowing in via the connecting piece 3 is regulated.
  • the control opening 10 can have a different cross-section depending on the desired characteristic curve or the characteristic curve adapted to the respective internal combustion engine.
  • the chamber 5 also has an opening 11 on the circumference, via which the regulated idle air flows into the radially directed connecting piece 4.
  • a disk 12 essentially dividing the chamber 5 is arranged in the drive connection between the flat rotary valve 6 and the stepping motor 7.
  • the disk 12 forms a drum 14 with the axially spaced flat rotary slide valve 6 via a cylindrical casing 13.
  • the drum 14 has a recess 15 in the casing 13 which corresponds to the circumferential opening 11 of the chamber 5. Condensates of oil, water and other foreign matter which precipitate out of the idling air absorbs the drum 14, as a result of which it forms an effective condensate barrier towards the chamber part 5 'of the stepping motor 7.
  • a drum 14 lined with plastic or made of plastic also counteracts premature icing of water-containing condensates.
  • labyrinth seals 16 and 17 are provided.
  • the device 1 of FIG. 1 has identical parts with the same reference numbers.
  • the device l ⁇ is characterized by a condensate lock arranged in a housing-fixed manner in the chamber 5 between the disk 12 and the stepper motor 7 in the chamber 5 from a ring 18 adjacent to the motor-side end of the disk 12.
  • the disk 12 is on the side facing away from the stepper motor 7 and has an axially spaced flat rotary valve 6 to regulate the idle air flowing in via an opening 9 in the end wall 8 of the chamber 5 in a coaxial drive connection.
  • the ring 18 fixed to the housing has a conical collar 19 directed towards the motor-side end face of the disk 12.
  • This collar 19 is made of an elastic material and its dimensions are such that it is elastic to the respective diameter of the flat rotary valve 6 and the disk 12 is expandable. With the washer 12 placed in the chamber 5, the collar 19 delimits a predetermined axial gap 20.
  • the housing-fixed arrangement of the ring 18 in the region of the annular gap 21 between the washer 12 and the housing 2 defined by the circumferential clearance with the housing 2 closes a liquid-tight connection of the ring 18 with the housing 2.
  • the idle air flows radially to and axially in contrast to the device 1 of FIG. 1.
  • the disc 12 with a tongue-like cylinder section 22 arranged on the outer circumference forms a rotary valve 23 for radially flowing idling air.
  • a fixed ring 24 is arranged adjacent to the disk 12 of the rotary slide valve 23 without contact.
  • the fixed ring 24, which is arranged as a fixed condensate barrier, is arranged in a part 25 Section of a two-part housing 25.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

In the case of a device 1 for controlling the idle air of internal combustion engines a rotary slide valve 6 controlling connection tubes 3 and 4 on a housing 2 and a stepping motor 7 connected to the same drive shaft are located in a common chamber 5 of the housing 2. The rotary slide valve 6 is a flat rotary slide valve 6 built into a drum 14. The drum 14, through which the regulated idle air flows, serves as a condensate barrier rotatably arranged inside the housing 2, which retains foreign bodies separated out of the idle air, in particular condensates, and prevents them getting into the chamber section 5' of the stepping motor 7, thereby improving the reliability of the regulating device 1. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung gemäß der im Oberbegriff des Hauptanspruches angegebenen Bauart.The invention relates to a device according to the type specified in the preamble of the main claim.

Eine Vorrichtung dieser Bauart ist beispielsweise aus der DE-A-33 37 590 bekannt und dient der Regelung der an einem Leistungssteuerorgan der Brennkraftmaschine im Bypass vorbeigeführten Leerlaufluft. Bei derartigen Vorrichtungen ist zu beobachten, daß die an der Steuer­kante des Drehschiebers vorbeiströmende Leerlaufluft an den der Kammer des Drehschiebers zugewandten Flächen öl- ­und wasserhaltige Ablagerungen bewirkt, die bei tiefen Umgebungstemperaturen Kondensate bilden.A device of this type is known, for example, from DE-A-33 37 590 and serves to regulate the idle air that is bypassed past a power control element of the internal combustion engine. In devices of this type, it can be observed that the idle air flowing past the control edge of the rotary valve causes oil and water-containing deposits on the surfaces facing the chamber of the rotary valve, which form condensates at low ambient temperatures.

Bei der bekannten Vorrichtung ist der Drehschieber mittels eines am Außenumfang der die geregelte Leer­laufluft zum Abströmstutzen lenkenden Scheibe angeord­neten, zungenartigen Zylinderabschnittes gebildet, wobei die Scheibe mit Umfangsspiel im Gehäuse angeordnet ist. Diese mit Umfangsspiel angeordnete Scheibe bildet im wesentlichen die Trennung zwischen einem den Drehschie­ber aufnehmenden Teil und einem den Schrittschaltmotor aufnehmenden Teil der Kammer des Gehäuses. Über den aus dem vorbestimmten Umfangsspiel zwischen Scheibe und Gehäuse gegebenen Ringspalt können bei ungünstiger Fahrzeugbetriebslage Öl- und Wasserkondensate in den elektrischen Antrieb des Drehschiebers eindringen und zu Korrosion und Kurzschluß führen. Aus dem vorstehend Angeführten folgt ferner, daß die Verwendung der Vor­richtung durch vorgeschriebene Einbaulagen zur Verhin­derung des Eindringens von Flüssigkondensaten einge­schränkt wird.In the known device, the rotary valve is formed by means of a tongue-like cylinder section arranged on the outer circumference of the disk which directs the regulated idle air to the outflow connection, the disk being arranged in the housing with circumferential play. This disc arranged with circumferential play essentially forms the separation between a part receiving the rotary slide valve and a part of the chamber of the housing receiving the stepping motor. About the given from the predetermined circumferential clearance between the disc and the housing gap can be less favorable Vehicle operating position Oil and water condensates penetrate the electrical drive of the rotary valve and lead to corrosion and short circuit. It also follows from the above that the use of the device is restricted by prescribed installation positions for preventing the penetration of liquid condensates.

Der Erfindung liegt die Aufgabe zugrunde, die Betriebs­sicherheit der im Oberbegriff des Hauptanspruches beschriebenen Vorrichtung mit einfachen Mitteln zu verbessern.The invention has for its object to improve the operational safety of the device described in the preamble of the main claim with simple means.

Diese Aufgabe wird durch das im Kennzeichen des Haupt­anspruches angegebene Merkmal gelöst. Mit der Erfindung der Kondensatsperre wird ein Eindringen von Flüssigkon­densaten in den elektrischen Antrieb des Drehschiebers vermieden und ferner entfallen Beschränkungen hinsicht­lich der Einbaulage der Vorrichtung zur Regelung der Leerlaufluft für Brennkraftmaschinen.This object is achieved by the feature specified in the characterizing part of the main claim. With the invention of the condensate barrier, the penetration of liquid condensates into the electrical drive of the rotary valve is avoided and, furthermore, there are no restrictions with regard to the installation position of the device for regulating the idle air for internal combustion engines.

In einer bevorzugten Ausgestaltung der Erfindung wird die Kondensatsperre mittels einer im Gehäuse der Vor­richtung drehbeweglich angeordneten Trommel verwirk­licht, die an einer Stirnseite als Flachdrehschieber zur Regelung der zuströmenden Leerlaufluft ausgebildet ist. Der Trommel strömt die Leerlaufluft in axialer Richtung zu, wobei die die Ablagerungen bewirkenden Strömungs­vorgänge der in den Innenraum der Trommel einströmenden Leerlaufluft an der dem Innenraum der Trommel zugewand­ten Steuerkante ausgelöst werden. Dadurch aus der Leerlaufluft ausgeschiedene öl- und wasserhaltige Bestandteile werden somit an der Trommelinnenseite abgelagert. Störende Ablagerungen zwischen der Stirnwand der Kammer und dem Flachdrehschieber sind damit vermie­den. Zugleich bildet aber die Trommel eine relativ zum Gehäuse bewegliche Kondensatsperre, die ein Vordringen von öl- und wasserhaltigen Kondensaten zum elektrischen Antriebsteil der Vorrichtung sicher unterbindet. Da ferner der Innenraum der Trommel vom motorseitigen Unterdruck beaufschlagt wird, ist auch eine Ausbringung des Kondensats sichergestellt.In a preferred embodiment of the invention, the condensate barrier is implemented by means of a drum which is rotatably arranged in the housing of the device and which is designed on one end face as a flat rotary slide valve for regulating the inflowing idle air. The idle air flows into the drum in the axial direction, the flow processes causing the deposits of the idle air flowing into the interior of the drum being triggered at the control edge facing the interior of the drum. As a result, oil and water-containing constituents which have been eliminated from the idle air are deposited on the inside of the drum. Annoying deposits between the front wall of the chamber and the rotary valve are avoided. At the same time, however, the drum forms a relative to Housing movable condensate lock, which reliably prevents the penetration of oil and water-containing condensates to the electrical drive part of the device. Furthermore, since the interior of the drum is acted upon by the negative pressure on the motor side, discharge of the condensate is also ensured.

Um der Gefahr einer Vereisung bei tiefen Temperaturen durch zusätzliche Abkühlung der gesteuerten Leerlaufluft entgegenzuwirken, kann die Trommel in weiterer Ausge­staltung der Erfindung entweder aus Kunststoff oder an der Innenseite mit Kunststoff beschichtet sein. Weiter ist die Gefahr einer Vereisung in dem zwischen der Stirnwand der Kammer und dem Flachdrehschieber angeord­neten Luftspalt wesentlich dadurch vermindert, daß dieser Luftspalt über einen relativ großen Umfangsspalt für die Trommel vom Unterdruck der Brennkraftmaschine leergesaugt wird. Dabei kann die Leckluftmenge über diesen Luftspalt in vorteilhafter Weise durch eine Labyrinthdichtung zwischen dem Flachdrehschieber und der Stirnwand der Kammer bestimmt werden. Da ferner die den Flachdrehschieber mit der Kondensatsperre kombinierende Trommel auch bei relativ hohen Umgebungstemperaturen formbeständig ist, können Luftspalt und Labyrinthdich­tung vorteilhaft aufeinander abgestimmt werden. Weiter wird mit der axial einströmenden Leerlaufluft eine geringere radiale Lagerbelastung erreicht. Schließlich kann die Einbaulage der erfindungsgemäßen Vorrichtung beliebig sein.In order to counteract the risk of icing at low temperatures by additional cooling of the controlled idle air, the drum can be either made of plastic or coated on the inside with plastic in a further embodiment of the invention. Furthermore, the risk of icing in the air gap arranged between the end wall of the chamber and the flat rotary slide valve is substantially reduced in that this air gap is sucked empty by the negative pressure of the internal combustion engine over a relatively large circumferential gap. The amount of leakage air through this air gap can advantageously be determined by a labyrinth seal between the flat rotary valve and the end wall of the chamber. Furthermore, since the drum combining the flat rotary slide valve with the condensate barrier is dimensionally stable even at relatively high ambient temperatures, the air gap and the labyrinth seal can advantageously be matched to one another. A lower radial bearing load is also achieved with the axially flowing idle air. Finally, the installation position of the device according to the invention can be as desired.

Neben der als drehbewegliche Trommel ausgebildeten Kondensatsperre kann diese nach einem anderen Bauprinzip der Erfindung gehäusefest angeordnet sein, wobei ein der motorseitigen Stirnseite der Scheibe berührungsfrei benachbarter Ring im Bereich des zwischen Scheibe und Gehäuse durch das Umfangsspiel vorgegebenen Ringspaltes mit dem Gehäuse in flüssigkeitsdichter Verbindung steht.In addition to the condensate barrier designed as a rotatable drum, this can be arranged in a housing-fixed manner according to another construction principle of the invention, with a ring adjacent to the motor-side end face of the disc in the region of between the disc and Housing by the circumferential clearance predetermined annular gap with the housing in a liquid-tight connection.

Bei einer ersten Ausgestaltung der Erfindung nach diesem Prinzip ist ein gehäusefester Ring mit einem kegeligen Kragen vorgesehen, der bei der Montage von einer mit einem Flachdrehschieber kombinierten Scheibe auf deren jeweilige Durchmesser elastisch aufweitbar ist und mit der Scheibe einen vorbestimmten axialen Spalt begrenzt.In a first embodiment of the invention based on this principle, a housing-fixed ring with a conical collar is provided, which can be elastically expanded to the respective diameter during assembly of a disc combined with a flat rotary slide valve and limits a predetermined axial gap with the disc.

In einer zweiten Ausgestaltung der Erfindung einer gehäusefesten Kondensatsperre ist diese für einen herkömmlichen, die zuströmende Leerlaufluft über eine umfängliche Durchbrechung der Kammer steuernden Dreh­schieber als ein fester Ring ausgebildet, der in einem Teil eines geteilten Gehäuses angeordnet ist.In a second embodiment of the invention, a condensate barrier fixed to the housing is designed as a fixed ring for a conventional rotary slide valve controlling the incoming idle air via a circumferential opening in the chamber, which ring is arranged in a part of a divided housing.

Die Erfindung ist anhand von in der Zeichnung darge­stellten Ausführungsbeispielen erläutert. Es zeigen:

  • Fig. 1 eine Vorrichtung zur Regelung der Leerlaufluft mittels eines in einer Trommel integrierten Flachdrehschiebers, wobei die Trommel als Kondensatsperre dient,
  • Fig. 2 eine Vorrichtung mit einem gesonderten Flachdrehschieber und einer gehäusefesten Kondensatsperre,
  • Fig. 3 eine weitere Vorrichtung mit einer gehäusefesten Kondensatsperre und einem Drehschieber für radial zuströmende Leerlauf­luft.
The invention is explained with reference to exemplary embodiments shown in the drawing. Show it:
  • 1 shows a device for regulating the idle air by means of a rotary slide valve integrated in a drum, the drum serving as a condensate barrier,
  • 2 shows a device with a separate flat rotary slide valve and a condensate barrier fixed to the housing,
  • Fig. 3 shows a further device with a housing-fixed condensate barrier and a rotary valve for radially inflowing idle air.

Eine Vorrichtung 1 zur Regelung der Leerlaufluft für eine nicht dargestellte Brennkraftmaschine umfaßt ein in einer nicht gezeigten Leerlaufluftleitung anordbares Gehäuse 2 mit zueinander quergerichteten Anschlußstutzen 3 und 4. Weiter umfaßt die Vorrichtung 1 in einer vom Gehäuse 2 begrenzten Kammer 5 einen die luftführende Verbindung zwischen den Anschlußstutzen 3 und 4 steuern­den Flachdrehschieber 6 sowie einen elektrischen Schrittschaltmotor 7 in gleichachsiger Antriebsverbin­dung. Der Flachdrehschieber 6 wirkt mit einer in einer Stirnwand 8 der Kammer 5 angeordneten Durchbrechung 9 zusammen, wobei die Durchbrechung 9 dem axial gerichte­ten Anschlußstutzen 3 zugeordnet ist. Der Flachdreh­schieber 6 weist eine Steueröffnung 10 auf, mittels der die über den Anschlußstutzen 3 zuströmende Leerlaufluft geregelt wird. Die Steueröffnung 10 kann je nach ge­wunschter bzw. der jeweiligen Brennkraftmaschine ange­paßter Kennlinie einen unterschiedlichen Querschnitt aufweisen.A device 1 for regulating the idle air for an internal combustion engine, not shown, comprises a housing 2 which can be arranged in an idle air line, not shown, with connecting pieces 3 and 4 oriented transversely to one another 3 and 4 controlling rotary valve 6 and an electric stepper motor 7 in the same-axis drive connection. The flat rotary slide valve 6 interacts with an opening 9 arranged in an end wall 8 of the chamber 5, the opening 9 being associated with the axially directed connecting piece 3. The flat rotary slide valve 6 has a control opening 10, by means of which the idle air flowing in via the connecting piece 3 is regulated. The control opening 10 can have a different cross-section depending on the desired characteristic curve or the characteristic curve adapted to the respective internal combustion engine.

Die Kammer 5 weist ferner am Umfang eine Durchbre­chung 11 auf, über die die geregelte Leerlaufluft in den radial gerichteten Anschlußstutzen 4 abströmt. Jenseits der umfänglichen Durchbrechung 11 für die abströmende Leerlaufluft ist in der Antriebsverbindung zwischen dem Flachdrehschieber 6 und dem Schrittschaltmotor 7 eine die Kammer 5 im wesentlichen unterteilende Scheibe 12 angeordnet. Die Scheibe 12 bildet mit dem axial beab­standeten Flachdrehschieber 6 über einen zylindrischen Mantel 13 eine Trommel 14. Die Trommel 14 weist eine mit der umfänglichen Durchbrechung 11 der Kammer 5 kor­respondierende Ausnehmung 15 im Mantel 13 auf. Aus der Leerlaufluft ausfallende Kondensate an Öl, Wasser und anderen Fremdstoffen nimmt die Trommel 14 auf, wodurch sie zum Kammerteil 5ʹ des Schrittschaltmotors 7 hin eine wirksame Kondensatsperre bildet. Weiter werden durch Strömungsverhältnisse an der trommelinnenseitigen Kante der Steueröffnung 10 bewirkte öl- und wasserhaltige Ausscheidungen an der Innenseite der Trommel 14 abgela­gert. Eine mit Kunststoff ausgekleidete oder aus Kunst­stoff gefertigte Trommel 14 wirkt ferner einer frühzei­tigen Vereisung von wasserhaltigen Kondensaten entgegen. Zur Erzielung einer relativ kleinen Leckluftmenge bei einem relativ großen Spalt zwischen dem Flachdrehschie­ber 6 und der Stirnwand 8 der Kammer 5 sind Labyrinth­dichtungen 16 und 17 vorgesehen.The chamber 5 also has an opening 11 on the circumference, via which the regulated idle air flows into the radially directed connecting piece 4. Beyond the circumferential opening 11 for the outflowing idle air, a disk 12 essentially dividing the chamber 5 is arranged in the drive connection between the flat rotary valve 6 and the stepping motor 7. The disk 12 forms a drum 14 with the axially spaced flat rotary slide valve 6 via a cylindrical casing 13. The drum 14 has a recess 15 in the casing 13 which corresponds to the circumferential opening 11 of the chamber 5. Condensates of oil, water and other foreign matter which precipitate out of the idling air absorbs the drum 14, as a result of which it forms an effective condensate barrier towards the chamber part 5 'of the stepping motor 7. Be further through Flow conditions on the inside of the drum of the control opening 10 caused oil and water-containing precipitates deposited on the inside of the drum 14. A drum 14 lined with plastic or made of plastic also counteracts premature icing of water-containing condensates. To achieve a relatively small amount of leakage air with a relatively large gap between the flat rotary valve 6 and the end wall 8 of the chamber 5, labyrinth seals 16 and 17 are provided.

Bei der in Fig. 2 gezeigten Vorrichtung 1ʹ sind mit der Vorrichtung 1 der Fig. 1 identische Teile mit den gleichen Bezugsziffern belegt. Die Vorrichtung lʹ ist gekennzeichnet durch eine zwischen Scheibe 12 und Schrittschaltmotor 7 in der Kammer 5 gehäusefest ange­ordnete Kondensatsperre aus einem der motorseitigen Stirnseite der Scheibe 12 berührungsfrei benachbarten Ring 18. Auf der vom Schrittschaltmotor 7 abgewandten Seite steht die Scheibe 12 mit einem axial beabstandeten Flachdrehschieber 6 zur Regelung der über eine Durch­brechung 9 in der Stirnwand 8 der Kammer 5 zuströmenden Leerlaufluft in gleichachsiger Antriebsverbindung. Der gehäusefest angeordnete Ring 18 trägt einen zur motor­seitigen Stirnseite der Scheibe 12 gerichteten, kege­ligen Kragen 19. Dieser Kragen 19 ist aus einem elastischen Material und in seinen Abmessungen so beschaffen, daß er bei der Montage von Flachdrehschie­ber 6 und Scheibe 12 auf deren jeweilige Durchmesser elastisch aufweitbar ist. Mit der in der Kammer 5 plazierten Scheibe 12 begrenzt der Kragen 19 einen vorbestimmten axialen Spalt 20. Die gehäusefeste Anord­nung des Ringes 18 im Bereich des zwischen Scheibe 12 und Gehäuse 2 durch Umfangsspiel vorgegebenen Ringspal­tes 21 mit dem Gehäuse 2 schließt eine flüssigkeits­dichte Verbindung des Ringes 18 mit dem Gehäuse 2 ein.In the device 1ʹ shown in FIG. 2, the device 1 of FIG. 1 has identical parts with the same reference numbers. The device lʹ is characterized by a condensate lock arranged in a housing-fixed manner in the chamber 5 between the disk 12 and the stepper motor 7 in the chamber 5 from a ring 18 adjacent to the motor-side end of the disk 12. The disk 12 is on the side facing away from the stepper motor 7 and has an axially spaced flat rotary valve 6 to regulate the idle air flowing in via an opening 9 in the end wall 8 of the chamber 5 in a coaxial drive connection. The ring 18 fixed to the housing has a conical collar 19 directed towards the motor-side end face of the disk 12. This collar 19 is made of an elastic material and its dimensions are such that it is elastic to the respective diameter of the flat rotary valve 6 and the disk 12 is expandable. With the washer 12 placed in the chamber 5, the collar 19 delimits a predetermined axial gap 20. The housing-fixed arrangement of the ring 18 in the region of the annular gap 21 between the washer 12 and the housing 2 defined by the circumferential clearance with the housing 2 closes a liquid-tight connection of the ring 18 with the housing 2.

Bei der Vorrichtung 1ʹʹ der Fig. 3 strömt die Leerlauf­luft im Gegensatz zur Vorrichtung 1 der Fig. 1 radial zu und axial ab. Mit der Fig. 1 identische Teile werden wiederum mit den gleichen Bezugsziffern belegt. Bei der Vorrichtung 1ʹʹ bildet die Scheibe 12 mit einem am Außenumfang angeordneten, zungenartigen Zylinderab­schnitt 22 einen Drehschieber 23 für radial zuströmende Leerlaufluft. Der Scheibe 12 des Drehschiebers 23 ist ein fester Ring 24 berührungsfrei benachbart angeordnet. Der als gehäusefest angeordnete Kondensatsperre dienende feste Ring 24 ist in einem Teil 25ʹ eines zweiteilig gebauten Gehäuses 25 angeordnet.In the device 1ʹʹ of FIG. 3, the idle air flows radially to and axially in contrast to the device 1 of FIG. 1. Parts identical to FIG. 1 are again given the same reference numerals. In the device 1ʹʹ, the disc 12 with a tongue-like cylinder section 22 arranged on the outer circumference forms a rotary valve 23 for radially flowing idling air. A fixed ring 24 is arranged adjacent to the disk 12 of the rotary slide valve 23 without contact. The fixed ring 24, which is arranged as a fixed condensate barrier, is arranged in a part 25 Teil of a two-part housing 25.

Claims (7)

1. Vorrichtung zum Regeln der Leerlaufluft für Brenn­kraftmaschinen,
      - die ein in einer Leerlaufluftleitung anordbares Gehäuse (2) mit Anschlußstutzen (3,4) sowie
      - in einer vom Gehäuse begrenzten Kammer (5) einen die luftführende Verbindung zwischen den Anschluß­stutzen regelnden Drehschieber (6) und einen elektrischen Schrittschaltmotor (7) in gleichach­siger Antriebsverbindung umfaßt,
      - wobei die Leerlaufluft zuströmseitig geregelt wird, und
      - abströmseitig des Drehschiebers mittels einer die Kammer unterteilenden Scheibe (12) zum Abström-­Anschlußstutzen (4) gelenkt ist,
      - wobei die in der Antriebsverbindung angeordnete Scheibe mit Umfangsspiel im Gehäuse angeordnet ist, dadurch gekennzeichnet,
      - daß die Scheibe (12) ein Element einer zum Kammer­teil (5ʹ) des Schrittschaltmotors (7) hin wirksamen Kondensatsperre bildet.
1. Device for regulating the idle air for internal combustion engines,
- Which can be arranged in an idle air line housing (2) with connecting piece (3,4) and
- In a chamber (5) bounded by a housing, the air-guiding connection between the connecting piece regulating rotary valve (6) and an electric stepping motor (7) in coaxial drive connection,
- The idle air is regulated on the inflow side, and
- is directed to the outflow connection piece (4) on the outflow side of the rotary slide valve by means of a disk (12) dividing the chamber,
the disc arranged in the drive connection being arranged with circumferential play in the housing, characterized in that
- That the disc (12) forms an element of the chamber part (5ʹ) of the stepping motor (7) effective condensate barrier.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeich­net,
      - daß die Scheibe (12) mit einem in der Kammer (5) axial beabstandeten Flachdrehschieber (6) über einen zylindrischen Mantel (13) eine Trommel (14) bildet,
      - daß die Trommel mit Umfangsspiel angeordnet ist und eine mit einer umfänglichen Durchbrechung (11) der Kammer (5) korrespondierende Ausnehmung (15) im Mantel aufweist,
      - daß ferner der Flachdrehschieber (6) mit einer Steueröffnung (10) einer für axial zuströmende Leerlaufluft dienenden Durchbrechung (9) in einer Stirnwand (8) der Kammer (5) zugeordnet ist und mit der Stirnwand dicht zusammenwirkt.
2. Device according to claim 1, characterized in
- That the disc (12) with a in the chamber (5) axially spaced rotary valve (6) on a drum (14) forms a cylindrical jacket (13),
- That the drum is arranged with circumferential play and has a recess (15) in the jacket corresponding to a circumferential opening (11) in the chamber (5),
- That the flat rotary valve (6) with a control opening (10) is used for axially flowing idle air opening (9) in an end wall (8) of the chamber (5) and closely cooperates with the end wall.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeich­net, daß die Trommel (14) aus Kunststoff oder an der Innenseite mit Kunststoff beschichtet ist.3. Apparatus according to claim 2, characterized in that the drum (14) made of plastic or coated on the inside with plastic. 4. Vorrichtung nach den Ansprüchen 1 - 3, dadurch gekennzeichnet, daß der Flachdrehschieber (6) mit der Stirnwand (8) über Labyrinthdichtungen (16,17) berührungsfrei dicht zusammenwirkt.4. Device according to claims 1-3, characterized in that the flat rotary valve (6) with the end wall (8) via labyrinth seals (16, 17) cooperates tightly without contact. 5. Vorrichtung nach Anspruch 1, gekennzeichnet durch eine zwischen Scheibe (12) und Schrittschaltmo­tor (7) in der Kammer (5) gehäusefest angeordnete Kondensatsperre aus einem der motorseitigen Stirn­seite der Scheibe (12) berührungsfrei benachbarten Ring (18,24), der im Bereich des zwischen Schei­be (12) und Gehäuse (2,25) durch Umfangsspiel vorgegebenen Ringspaltes (21) mit dem Gehäuse in flüssigkeitsdichter Verbindung steht.5. The device according to claim 1, characterized by a between the disc (12) and stepper motor (7) in the chamber (5) fixed to the housing arranged condensate barrier from a motor-side face of the disc (12) contact-free adjacent ring (18,24) in Area of the annular gap (21) between the disk (12) and the housing (2.25) which is predetermined by the circumferential clearance is in liquid-tight connection with the housing. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeich­net,
      - daß die Scheibe (12) mit einem axial beabstandeten Flachdrehschieber (6) zur Regelung der über eine Durchbrechung (9) in der Stirnwand (8) der Kam­ mer (5) zuströmenden Leerlaufluft in gleichachsiger Antriebsverbindung steht, und
      - daß der gehäusefest angeordnete Ring (18) einen zur Scheibe gerichteten, kegeligen Kragen (19) trägt,
      - der bei der Montage von Flachdrehschieber (6) und Scheibe (12) auf deren jeweilige Durchmesser elastisch aufweitbar ist, und
      - mit der Scheibe (12) einen vorbestimmten axialen Spalt (20) begrenzt.
6. The device according to claim 5, characterized in that
- That the disc (12) with an axially spaced rotary slide valve (6) for controlling the opening (9) in the end wall (8) of the cam mer (5) incoming idle air is in the same axis drive connection, and
- That the ring (18) arranged fixed to the housing carries a conical collar (19) directed towards the disk,
- Which is elastically expandable to the respective diameter when mounting the rotary valve (6) and disc (12), and
- With the disc (12) limits a predetermined axial gap (20).
7. Vorrichtung nach Anspruch 5,
      - wobei die Scheibe (12) mittels eines am Außenumfang angeordneten, zungenartigen Zylinderabschnit­tes (22) einen Drehschieber (23) bildet für radial zuströmende Leerlaufluft,
dadurch gekennzeichnet,
      - daß ein fester Ring (24) in einem Teil eines gebauten Gehäuses (25) angeordnet ist.
7. The device according to claim 5,
the disc (12) forms a rotary valve (23) for radially flowing idle air by means of a tongue-like cylinder section (22) arranged on the outer circumference,
characterized,
- That a fixed ring (24) is arranged in part of a built housing (25).
EP19870114004 1986-09-30 1987-09-25 Idle air control device for internal-combustion engines Expired - Lifetime EP0263368B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3633260 1986-09-30
DE19863633260 DE3633260A1 (en) 1986-09-30 1986-09-30 CONTROL DEVICE FOR REGULATING THE IDLE AIR FOR INTERNAL COMBUSTION ENGINES

Publications (3)

Publication Number Publication Date
EP0263368A2 true EP0263368A2 (en) 1988-04-13
EP0263368A3 EP0263368A3 (en) 1989-05-17
EP0263368B1 EP0263368B1 (en) 1990-12-27

Family

ID=6310717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870114004 Expired - Lifetime EP0263368B1 (en) 1986-09-30 1987-09-25 Idle air control device for internal-combustion engines

Country Status (3)

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EP (1) EP0263368B1 (en)
DE (2) DE3633260A1 (en)
ES (1) ES2022853B3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3909396A1 (en) * 1989-03-22 1990-10-04 Bayerische Motoren Werke Ag DEVICE FOR MEASURING THE IDLE AIR OF INTERNAL COMBUSTION ENGINES

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001473A1 (en) * 1980-01-17 1981-07-23 Robert Bosch Gmbh, 7000 Stuttgart ADJUSTMENT FOR TURNING ANGLE
FR2533291A1 (en) * 1982-09-17 1984-03-23 Bosch Gmbh Robert METHOD AND DEVICE FOR CONTROLLING AT LEAST ONE CROSS-SECTIONAL TRAPPING SECTION IN A CONTROL PIPE
DE3340060A1 (en) * 1983-11-05 1984-12-20 Daimler-Benz Ag, 7000 Stuttgart Device for controlling the idling of a mixture-compressing internal combustion engine
DE3337590A1 (en) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart ELECTRIC ACTUATOR

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3019167A1 (en) * 1980-05-20 1981-11-26 Robert Bosch Gmbh, 7000 Stuttgart EM mixture regulator for IC engine - is of coaxial construction, which can be inserted in supply line
DE3242043A1 (en) * 1982-11-13 1984-05-17 Vdo Adolf Schindling Ag, 6000 Frankfurt ELECTRICAL ARRANGEMENT FOR CONTROLLING THE IDLE SPEED OF A COMBUSTION FUEL ENGINE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001473A1 (en) * 1980-01-17 1981-07-23 Robert Bosch Gmbh, 7000 Stuttgart ADJUSTMENT FOR TURNING ANGLE
FR2533291A1 (en) * 1982-09-17 1984-03-23 Bosch Gmbh Robert METHOD AND DEVICE FOR CONTROLLING AT LEAST ONE CROSS-SECTIONAL TRAPPING SECTION IN A CONTROL PIPE
DE3337590A1 (en) * 1983-10-15 1985-04-25 Robert Bosch Gmbh, 7000 Stuttgart ELECTRIC ACTUATOR
DE3340060A1 (en) * 1983-11-05 1984-12-20 Daimler-Benz Ag, 7000 Stuttgart Device for controlling the idling of a mixture-compressing internal combustion engine

Also Published As

Publication number Publication date
ES2022853B3 (en) 1991-12-16
DE3767110D1 (en) 1991-02-07
EP0263368A3 (en) 1989-05-17
DE3633260A1 (en) 1988-04-07
EP0263368B1 (en) 1990-12-27
DE3633260C2 (en) 1988-10-13

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