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EP0493555B1 - Valve for the metered addition of volatilized fuel to the fuel/air mixture in an internal-combustion engine - Google Patents

Valve for the metered addition of volatilized fuel to the fuel/air mixture in an internal-combustion engine Download PDF

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Publication number
EP0493555B1
EP0493555B1 EP19910912517 EP91912517A EP0493555B1 EP 0493555 B1 EP0493555 B1 EP 0493555B1 EP 19910912517 EP19910912517 EP 19910912517 EP 91912517 A EP91912517 A EP 91912517A EP 0493555 B1 EP0493555 B1 EP 0493555B1
Authority
EP
European Patent Office
Prior art keywords
valve
housing
seat
fuel
magnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19910912517
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German (de)
French (fr)
Other versions
EP0493555A1 (en
Inventor
Siegfried Fehrenbach
Erwin Krimmer
Wolfgang Schulz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP0493555A1 publication Critical patent/EP0493555A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M2025/0845—Electromagnetic valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures
    • Y10T137/88054—Direct response normally closed valve limits direction of flow

Definitions

  • the invention relates to a valve for the metered admixture of fuel volatilized from the fuel tank of an internal combustion engine to a fuel / air mixture supplied to the internal combustion engine via an intake pipe of the type defined in the preamble of claim 1.
  • the fuel volatilizing in the fuel tank the so-called gasoline vapor
  • the vent port of the fuel tank is connected to a storage tank filled with activated carbon, which stores the volatilized fuel when the internal combustion engine is stopped and again when the internal combustion engine is running delivers.
  • the accumulator is connected to the intake pipe of the internal combustion engine via an intake line, where the fuel vapor is added to the fuel / air mixture.
  • tank ventilation valve defined at the outset, which is switched on in the intake line between the accumulator and the intake pipe and is opened or closed by control electronics, preferably clocked, depending on the operating state of the internal combustion engine and the exhaust gas emission measured with a lambda probe .
  • control electronics preferably clocked, depending on the operating state of the internal combustion engine and the exhaust gas emission measured with a lambda probe .
  • the seat valve integrated in the tank ventilation valve is designed to be normally closed.
  • the double function of the annular valve member, which also forms the armature of the electromagnet, enables a low movable mass of the armature and thus short switching times of the seat valve.
  • Such a stroke adjustment is realized in a known tank ventilation valve of the type mentioned at the beginning (DE 38 44 453 Al) in that the valve double seat with valve opening is formed on an intermediate ring clamped in the housing and on the side of the intermediate ring facing the inflow connection piece, a bellows with its one end face is attached, the other end face of which is attached to the bottom of a bellows enclosing the bellows with radial spacing.
  • the pot edge of the pot merges into an annular collar projecting radially over the annular valve opening, which has a number of axial bores arranged distributed in the circumferential direction, which are aligned with the valve opening in the axial direction.
  • the intermediate ring has on its side facing the pot a sealing seat which surrounds the valve opening on the inside and outside and which cooperates with the ring collar of the pot which acts as a closing member. If the vacuum at the inflow nozzle increases, the bellows contracts. The ring collar approaches the sealing seat and the flow cross section at the sealing seat becomes smaller. The limit is reached when the ring collar of the pot rests on the sealing seat. The axial bores in the ring collar then determine the remaining opening cross section of the seat valve.
  • the tank ventilation valve according to the invention with the characterizing features of claim 1 has the advantage, in comparison, of realizing a normally closed seat valve with valve member stroke largely adapted to the pressure difference upstream and downstream of the valve seat, with little manufacturing effort.
  • the valve member or the armature is drawn more strongly in the direction of the valve double seat with increasing negative pressure in the intake pipe of the internal combustion engine and thus at the outflow connection of the tank ventilation valve. This suction force counteracts the force of the electromagnet.
  • a separate valve seat support is saved, making the valve more cost-effective.
  • valve closing spring acting in the suction direction can also be dimensioned much smaller.
  • the screwed connection between the magnetic core and the magnetic housing enables simple axial displacement of the magnetic core and thus very simple adjustment of the stroke stop for the armature.
  • the annular gap nozzle is basically arranged in a recess in the yoke and the valve member or armature is guided axially displaceably with a small radial distance in the recess by means of a leaf spring held in the valve housing, preferably made of non-magnetic material. This ensures easy guidance of the anchor. The leaf spring is tolerated so that lateral tilting of the armature is prevented.
  • the volatilized fuel flowing from the inflow nozzle via the seat valve to the outflow nozzle is guided both through the hollow cylindrical magnetic core and through axial channels between the magnet housing and the valve housing.
  • a non-return valve is required, which opens towards the outflow nozzle.
  • a check valve is integrated in a simple manner in the valve housing between the valve seat and outflow connection.
  • the valve seat of the check valve is formed on the valve housing and its valve member is pressed onto the valve seat with a valve spring which is supported on the outflow connection.
  • the valve schematically shown in longitudinal section in FIG. 1 for metered admixing of fuel volatilized from the fuel tank of an internal combustion engine to a fuel-air mixture supplied to the internal combustion engine via an intake pipe, hereinafter referred to as a tank ventilation valve, is used in a dispensing system for introducing volatilized fuel into an internal combustion engine. as described in DE 35 19 292 A1.
  • the tank ventilation valve has a two-part valve housing 10 with a cup-shaped housing part 101 and a cap-shaped housing part 102 that terminates this.
  • the housing part 101 carries an inflow connection 11 for connection to a ventilation connection of the fuel tank or to a downstream, filled with activated carbon, storage for the volatilized fuel, while the housing part 102 carries an outflow connection 12 for connection to the intake pipe of the internal combustion engine.
  • Inflow connection 11 and outflow connection 12 are each arranged axially in the housing parts 101 and 102, respectively.
  • An electromagnet 13 is arranged in the interior of the pot-shaped housing part 101. It has a pot-shaped magnet housing 14 with a coaxial, hollow-cylindrical magnetic core 13 penetrating the bottom of the pot and a cylindrical excitation coil 16, which is seated on a coil carrier 17 and in the magnet housing 14 Magnetic core 15 surrounds.
  • an outwardly projecting threaded connector 18 with an internal thread 19 is integrally formed, in which an external thread section 20 is screwed onto the hollow cylindrical magnet core 15.
  • the magnetic core 15 is aligned with the inflow nozzle 11, so that the volatilized fuel flowing in here passes directly into the magnetic core 15 and flows through it.
  • the magnet housing 14 with the magnetic core 15 is inserted in the cup-shaped housing part 101 in such a way that 10 axial channels remain between the outer jacket of the magnet housing 14 and the inner jacket of the valve housing, which channels are offset from one another in the circumferential direction by the same angle.
  • axial channels 21, 22 are on the one hand via an annular space 23, which remains between the valve housing 10 and the external thread section 20 of the magnetic core 15, with the inflow connector 11 and, on the other hand, via bores 24 which are introduced into the magnet housing 14 near the open end of the magnet housing 14 , in connection with the inside of the magnet housing 14.
  • the volatilized fuel emerging from the inflow nozzle 11 also flows around the magnet housing 14 and dissipates any heat generated here.
  • the edge of the magnet housing 14 is angled outwards to form an annular support flange 25, which is bent at the end into an axially projecting annular web 26.
  • the support flange 25 serves to receive a yoke 27, which covers the magnet housing 14 and rests against the ring web 26 at the edge.
  • the yoke 27 shown enlarged in section and plan view in FIGS. 2 and 3 is seated by means of two fitting holes 28 on two retaining pins 29 in the cap-shaped housing part 102, which on the Project part 101 facing the underside axially.
  • a leaf spring 30 made of non-magnetic material, for example made of bronze, is clamped between the support flange 25 and the yoke 27, which is centered on the holding pin 29 and carries the armature of the electromagnet 13.
  • the electromagnet 13 is used for the clocked switching of a seat valve 31 which is arranged between the inflow nozzle 11 and the outflow nozzle 12.
  • the seat valve 31 has a valve double seat 32 (FIG. 2), which is arranged at the bottom of a recess 33 in the yoke 27 on the side facing the inflow nozzle 11.
  • the recess 33 is designed such that the base of the recess 33 carrying the valve double seat 32 faces the magnetic core 15.
  • the valve double seat 32 coaxially encloses an annular gap nozzle 34 on the outside and inside, which is designed as two symmetrical, semicircular arc gaps 35, 36 in the yoke 27.
  • a valve member in the form of an annular disk 37 made of magnetic material interacts with the valve double seat 22 and at the same time forms the armature of the electromagnet 13.
  • the annular disc 37 engages with a centering 38 through a circular recess 39 in the leaf spring 30 and is attached to this.
  • the annular disc 37 is dimensioned so that its axial thickness is slightly less than the inside depth of the recess 33 and its diameter is slightly smaller than the inside diameter of the recess 33, so that only between the outer circumference of the annular disc 37 and the inner shell of the recess 33 an extremely small annular gap 40 remains.
  • the leaf spring 30 is tolerated so that a lateral magnetic tilting Washer 37 is reliably prevented.
  • the annular disk 37 carries a sealing rubber 41 on its side facing the valve double seat 32.
  • the annular disk 37 with its sides covered with the sealing rubber 41 is pressed onto the valve double seat 32 by a valve closing spring 49.
  • the valve closing spring 49 is supported on the one hand on the annular disk 37 and on the other hand on an annular support shoulder 50 which is formed on the inner wall of the hollow cylindrical magnetic core 15.
  • the free end face of the magnetic core 15 forms a stop 51 for the lifting movement of the annular disk 37.
  • the stop thread 51 can be axially displaced by means of the adjusting thread formed by the internal thread 19 and the external thread section 20, and thereby the flow rate can be determined with the seat valve 31 open at the maximum.
  • valve closing spring 49 is of small dimensions since, in the event of a pressure drop between the outlet connection 12 and the inlet connection 11, the annular gap nozzle 34 exerts a suction effect on the annular disk 37 in the direction of valve firing, thus supporting the closing effect of the valve spring 49.
  • the rear side of the yoke 27 facing away from the valve double seat 32 is sealed off from the housing part 102 by a sealing ring 42, so that leakage losses via the connection of the yoke 27 and the magnet housing 14 are avoided.
  • the outflow connector 12 is snapped into an outflow connector 12 which is coaxially formed on the housing part 102.
  • a valve seat 44 of a check valve 45 is formed in the receiving socket 43 on a radially inwardly projecting annular shoulder, on which a valve body 46 is pressed by a valve spring 47.
  • the valve spring 47 is supported in an abutment 48 provided in the receiving socket 43.
  • the check valve 45 is required if the tank ventilation valve is used in so-called loader engines should.
  • the seat valve 31 When the electromagnet 13 is de-energized, the seat valve 31 is closed, since the annular disk 37 with its sealing rubber 41 is pressed onto the valve double seat 32 by the valve closing spring 49.
  • the electromagnet 13 When the internal combustion engine is operating, the electromagnet 13 is actuated in a clocked manner by control electronics. The cycle rate is predetermined by the operating state of the internal combustion engine, so that the flow rate of volatilized fuel that passes through the seat valve 31 from the inflow nozzle 11 into the outflow nozzle 12 is metered accordingly.
  • This electromagnetic actuation of the seat valve 31 is superimposed by influencing the stroke of the annular disk 37 due to the suction effect of the annular gap nozzle 34.
  • the invention is not limited to the exemplary embodiment described.
  • the centering of the leaf spring 30 can also be carried out on the yoke 27 instead of on the housing part 102 by means of pins of the same type.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Abstract

The tank-ventilating valve proposed has a housing (10) with inlet and outlet pipes (11, 12) between which an electromagnetically operated seat valve (31), biased in the valve-closure direction by a closure spring (49), is located. To ensure a simple valve design, the valve aperture is designed as a ring-gap nozzle (34) located in the magnet yoke (27) of the electromagnet (13), and the double valve seat (32) which acts together with the valve element (37) and surrounds the ring-gap nozzle (34), is located on the inlet-pipe (11) side of the magnet yoke (27). The hollow cylindrical core magnet (15) in the magnet housing (14) can be displaced by rotating a threaded adjustment element (19, 20) in the magnet housing (14), thus adjusting the stroke of the valve element (37). Resting against the core magnet (14) is a valve-closure spring (49) which biases the valve element (37), formed by the armature of the electromagnet (13), in the closure direction.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Ventil zum dosierten Zumischen von aus dem Kraftstofftank einer Brennkraftmaschine verflüchtigtem Kraftstoff zu einem der Brennkraftmaschine über ein Ansaugrohr zugeführten Kraftstoffluftgemisch der im Oberbegriff des Anspruchs 1 definierten Gattung.The invention relates to a valve for the metered admixture of fuel volatilized from the fuel tank of an internal combustion engine to a fuel / air mixture supplied to the internal combustion engine via an intake pipe of the type defined in the preamble of claim 1.

Aufgrund gesetzlicher Vorschriften zum Schutz der Umwelt darf in einigen Ländern der im Kraftstofftank sich verflüchtigende Kraftstoff, der sog. Benzindampf, nicht ins Freie entlüftet, sondern muß durch Einleiten in die Brennkraftmaschine verbrannt werden. Hierzu ist der Entlüftungsstutzen des Kraftstofftanks an einem mit Aktivkohle gefüllten Speicher angeschlossen, der den verflüchtigten Kraftstoff bei stehender Brennkraftmaschine aufnimmt und bei laufender Brennkraftmaschine wieder abgibt. Dazu ist der Speicher über eine Ansaugleitung mit dem Ansaugrohr der Brennkraftmaschine verbunden, wo der Kraftstoffdampf dem Kraftstoffluftgemisch beigegeben wird. Die hierdurch mögliche Erhöhung der Abgasemission erfordert ein Zumischen des Kraftstoffdampfes nur in bestimmten Betriebszuständen der Brennkraftmaschine und in bestimmten Mengen. Dies wird mit dem eingangs definierten sog. Tankentlüftungsventil bewirkt, das in der Ansaugleitung zwischen Speicher und Ansaugrohr eingeschaltet ist und von einer Steuerelektronik, vorzugsweise getaktet, in Abhängigkeit von dem Betriebszustand der Brennkraftmaschine und der mit einer Lambda-Sonde gemessenen Abgasemission geöffnet bzw. geschlossen wird. Um beim Abstellen der Brennkraftmaschine deren Nachlaufen zu verhindern, ist das im Tankentlüftungsventil integrierte Sitzventil stromlos geschlossen ausgebildet. Die Doppelfunktion des ringförmigen Ventilglieds, das zugleich den Anker des Elektromagneten bildet, ermöglicht eine geringe bewegliche Masse des Ankers und damit kurze Schaltzeiten des Sitzventils.In some countries, due to legal regulations to protect the environment, the fuel volatilizing in the fuel tank, the so-called gasoline vapor, must not be vented to the outside, but must be burned by introducing it into the engine. For this purpose, the vent port of the fuel tank is connected to a storage tank filled with activated carbon, which stores the volatilized fuel when the internal combustion engine is stopped and again when the internal combustion engine is running delivers. For this purpose, the accumulator is connected to the intake pipe of the internal combustion engine via an intake line, where the fuel vapor is added to the fuel / air mixture. The possible increase in the exhaust gas emission as a result requires the fuel vapor to be mixed in only in certain operating states of the internal combustion engine and in certain amounts. This is achieved with the so-called tank ventilation valve defined at the outset, which is switched on in the intake line between the accumulator and the intake pipe and is opened or closed by control electronics, preferably clocked, depending on the operating state of the internal combustion engine and the exhaust gas emission measured with a lambda probe . In order to prevent the internal combustion engine from running on when the internal combustion engine is switched off, the seat valve integrated in the tank ventilation valve is designed to be normally closed. The double function of the annular valve member, which also forms the armature of the electromagnet, enables a low movable mass of the armature and thus short switching times of the seat valve.

Bei solchen Tankentlüftungsventilen ist es wünschenswert, den Hub des Ventilglieds an der Druckdifferenz zwischen dem Druck stromaufwärts und stromabwärts des Ventilsitzes anzupassen, und zwar in der Weise, daß der Hub bei Leerlauf der Brennkraftmaschine (große Druckdifferenz) klein ist und sich mit zunehmender Last der Brennkraftmaschine (abnehmende Druckdifferenz) ständig vergrößert. Durch eine solche Hubanpassung und durch die damit bewirkte Veränderung des getaktet freigegebenen Strömungsquerschnitts wird eine größere Genauigkeit bei der Steuerung kleiner Durchsatzmengen bei großer Druckdifferenz am Ventilsitz (Leerlauf der Brennkraftmaschine) erreicht, die extrem kleine Schaltzeiten, wie sie bei konstantem Ventilhub zur Steuerung dieser kleiner Durchsatzmengen erforderlich wären, nicht erfordert. Der Elektromagnet läßt sich hierdurch klein und leicht bauen.In such tank ventilation valves, it is desirable to adapt the stroke of the valve member to the pressure difference between the pressure upstream and downstream of the valve seat, in such a way that the stroke when the engine is idling (large pressure difference) is small and increases with increasing load on the engine (decreasing pressure difference) constantly increasing. Such a stroke adjustment and the resulting change in the clocked released flow cross-section achieves greater accuracy in the control of small throughput quantities with a large pressure difference at the valve seat (idling of the internal combustion engine), the extremely short switching times as they are with constant valve lift for controlling these small throughput quantities would be required, not required. The electromagnet can be thereby building small and light.

Eine solche Hubanpassung ist bei einem bekannten Tankentlüftungsventil der eingangs genannten Art (DE 38 44 453 Al) dadurch realisiert, daß der Ventildoppelsitz mit Ventilöffnung an einem im Gehäuse eingespannten Zwischenring ausgebildet ist und auf der dem Zuströmstutzen zugekehrten Seite des Zwischenrings ein Faltenbalg mit seiner einen Stirnseite befestigt ist, dessen andere Stirnseite am Boden eines den Faltenbalg mit Radialabstand umgreifenden Topfes befestigt ist. Der Topfrand des Topfes geht in einen radial über die ringförmige Ventilöffnung vorstehenden Ringbund über, der eine Anzahl von in Umfangsrichtung verteilt angeordnete Axialbohrungen aufweist, die in Achsrichtung mit der Ventilöffnung fluchten. Der Zwischenring trägt auf seiner dem Topf zugekehrten Seite einen die Ventilöffnung innen und außen umgebenden Dichtsitz, der mit dem als Schließglied fungierenden Ringbund des Topfes zusammenwirkt. Steigt der Unterdruck am Zuströmstutzen, so zieht sich der Faltenbalg zusammen. Der Ringbund nähert sich dem Dichtsitz und der Strömungsquerschnitt am Dichtsitz wird kleiner. Die Grenze ist erreicht, wenn der Ringbund des Topfes auf dem Dichtsitz aufliegt. Die Axialbohrungen im Ringbund bestimmen dann den verbleibenden Öffnungsquerschnitt des Sitzventils.Such a stroke adjustment is realized in a known tank ventilation valve of the type mentioned at the beginning (DE 38 44 453 Al) in that the valve double seat with valve opening is formed on an intermediate ring clamped in the housing and on the side of the intermediate ring facing the inflow connection piece, a bellows with its one end face is attached, the other end face of which is attached to the bottom of a bellows enclosing the bellows with radial spacing. The pot edge of the pot merges into an annular collar projecting radially over the annular valve opening, which has a number of axial bores arranged distributed in the circumferential direction, which are aligned with the valve opening in the axial direction. The intermediate ring has on its side facing the pot a sealing seat which surrounds the valve opening on the inside and outside and which cooperates with the ring collar of the pot which acts as a closing member. If the vacuum at the inflow nozzle increases, the bellows contracts. The ring collar approaches the sealing seat and the flow cross section at the sealing seat becomes smaller. The limit is reached when the ring collar of the pot rests on the sealing seat. The axial bores in the ring collar then determine the remaining opening cross section of the seat valve.

Ein solcher konstruktiver Aufbau des Tankentlüftungsventils ist konstruktiv sehr aufwendig und erfordert damit relativ hohe Herstellkosten.Such a construction of the tank ventilation valve is structurally very complex and therefore requires relatively high manufacturing costs.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Tankentlüftungsventil mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, ein stromlos geschlossenes Sitzventil mit weitgehend an dem Druckunterschied stromauf- und stromabwärts des Ventilsitzes adaptierten Ventilgliedhub mit geringem Fertigungsaufwand zu realisieren. Durch die Düsenwirkung der Ringspaltdüse wird mit zunehmendem Unterdruck im Ansaugrohr der Brennkraftmaschine und damit am Abströmstutzen des Tankentlüftungsventils das Ventilglied bzw. der Anker stärker in Richtung Ventildoppelsitz angesaugt. Diese Saugkraft wirkt der Kraft des Elektromagneten entgegen. Durch die Integration der Ringspaltdüse im Rückschlußjoch wird ein separater Ventilsitzträger eingespart und das Ventil dadurch kostengünstiger. Aufgrund der Saugwirkung der Ringspaltdüse kann auch die in Saugrichtung wirkende Ventilschließfeder sehr viel kleiner dimensioniert werden. Die schraubende Verbindung zwischen Magnetkern und Magnetgehäuse ermöglicht eine einfache Axialverschiebung des Magnetkerns und damit eine sehr einfache Einstellung des Hubanschlags für den Anker.The tank ventilation valve according to the invention with the characterizing features of claim 1 has the advantage, in comparison, of realizing a normally closed seat valve with valve member stroke largely adapted to the pressure difference upstream and downstream of the valve seat, with little manufacturing effort. As a result of the nozzle action of the annular gap nozzle, the valve member or the armature is drawn more strongly in the direction of the valve double seat with increasing negative pressure in the intake pipe of the internal combustion engine and thus at the outflow connection of the tank ventilation valve. This suction force counteracts the force of the electromagnet. By integrating the annular gap nozzle in the yoke, a separate valve seat support is saved, making the valve more cost-effective. Due to the suction effect of the annular gap nozzle, the valve closing spring acting in the suction direction can also be dimensioned much smaller. The screwed connection between the magnetic core and the magnetic housing enables simple axial displacement of the magnetic core and thus very simple adjustment of the stroke stop for the armature.

Durch die in den weiteren Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Tankentlüftungsventils möglich.Advantageous further developments and improvements of the tank ventilation valve specified in claim 1 are possible through the measures listed in the further claims.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Ringspaltdüse im Grunde einer Vertiefung im Rückschlußjoch angeordnet und das Ventilglied bzw. der Anker mit geringem radialen Abstand in der Vertiefung mittels einer im Ventilgehäuse gehaltenen Blattfeder, vorzugsweise aus nichtmagnetischem Material, axial verschieblich geführt. Dadurch wird eine einfache Führung des Ankers sichergestellt. Die Blattfeder ist so toleriert, daß ein seitliches magnetisches Verkanten des Ankers verhindert wird.According to a preferred embodiment of the invention, the annular gap nozzle is basically arranged in a recess in the yoke and the valve member or armature is guided axially displaceably with a small radial distance in the recess by means of a leaf spring held in the valve housing, preferably made of non-magnetic material. This ensures easy guidance of the anchor. The leaf spring is tolerated so that lateral tilting of the armature is prevented.

Der vom Zuströmstutzen über das Sitzventil zum Abströmstutzen strömende verflüchtigte Kraftstoff wird gemäß einer weiteren Ausbildungsform der Erfindung sowohl durch den hohlzylindrischen Magnetkern als auch durch Axialkanäle zwischen dem Magnetgehäuse und dem Ventilgehäuse geführt. Dadurch wird die im Taktbetrieb des Elektromagneten erzeugte Wärme gut abgeführt.According to a further embodiment of the invention, the volatilized fuel flowing from the inflow nozzle via the seat valve to the outflow nozzle is guided both through the hollow cylindrical magnetic core and through axial channels between the magnet housing and the valve housing. As a result, the heat generated in the cycle operation of the electromagnet is dissipated well.

Bei Verwendung des Tankentlüftungsventils in sog. Ladermotoren ist ein Rückschlagventil erforderlich, das zum Abströmstutzen hin öffnet. Ein solches Rückschlagventil wird nach einer weiteren Ausführungsform der Erfindung in einfacher Weise im Ventilgehäuse zwischen Ventilsitz und Abströmstutzen integriert. Der Ventilsitz des Rückschlagventils ist am Ventilgehäuse ausgebildet und dessen Ventilglied wird mit einer am Abströmstutzen sich abstützenden Ventilfeder auf den Ventilsitz aufgepreßt.When using the tank ventilation valve in so-called loader engines, a non-return valve is required, which opens towards the outflow nozzle. According to a further embodiment of the invention, such a check valve is integrated in a simple manner in the valve housing between the valve seat and outflow connection. The valve seat of the check valve is formed on the valve housing and its valve member is pressed onto the valve seat with a valve spring which is supported on the outflow connection.

Zeichnungdrawing

Die Erfindung ist anhand eines in der Zeichnung dargestellten Ausführungsbeispiels in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen Längsschnitt eines Tankentlüftungsventils,
Fig. 2
einen Längsschnitt eines Rückschlußjochs eines Elektromagneten im Tankentlüftungsventil gemäß Fig. 1,
Fig. 3
eine Draufsicht des Rückschlußjoches in Fig. 2.
The invention is explained in more detail in the following description with reference to an embodiment shown in the drawing. Show it:
Fig. 1
a longitudinal section of a tank ventilation valve,
Fig. 2
2 shows a longitudinal section of a yoke of return of an electromagnet in the tank ventilation valve according to FIG. 1,
Fig. 3
3 shows a plan view of the yoke in return in FIG. 2.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Das in Fig. 1 im Längsschnitt schematisch dargestellte Ventil zum dosierten Zumischen von aus dem Kraftstofftank einer Brennkraftmaschine verflüchtigtem Kraftstoff zu einem der Brennkraftmaschine über ein Ansaugrohr zugeführten Kraftstoffluftgemisch, im folgenden Tankentlüftungsventil genannt, wird in einer Abgabeanlage zur Einleitung von verflüchtigtem Kraftstoff in eine Brennkraftmaschine verwendet, wie diese in der DE 35 19 292 Al beschrieben ist. Das Tankentlüftungsventil weist ein zweiteiliges Ventilgehäuse 10 mit einem topfförmigen Gehäuseteil 101 und einem dieses abschließenden kappenförmigen Gehäuseteil 102 auf. Der Gehäuseteil 101 trägt einen Zuströmstutzen 11 zum Anschließen an einem Entlüftungsstutzen des Kraftstofftanks oder an einem diesem nachgeschalteten, mit Aktivkohle gefüllten Speicher für den verflüchtigten Kraftstoff, während der Gehäuseteil 102 einen Abströmstutzen 12 zum Anschließen an das Ansaugrohr der Brennkraftmaschine trägt. Zuströmstutzen 11 und Abströmstutzen 12 sind jeweils axial in den Gehäuseteilen 101 bzw. 102 angeordnet. Im Innern des topfförmigen Gehäuseteils 101 ist ein Elektromagnet 13 angeordnet. Er weist in ein topfförmiges Magnetgehäuse 14 mit einem den Topfboden durchdringenden, koaxialen, hohlzylindrischen Magnetkern 13 und eine zylindrische Erregerspule 16 auf, die auf einem Spulenträger 17 sitzt und im Magnetgehäuse 14 den Magnetkern 15 umschließend einliegt. Am Boden des Magnetgehäuses 14 ist einstückig ein nach außen vorspringender Gewindestutzen 18 mit einem Innengewinde 19 ausgebildet, in welchem ein Außengewindeabschnitt 20 auf dem hohlzylindrischen Magnetkern 15 verschraubt ist. Durch Drehen des Magnetkerns 15 kann dieser im Magnetgehäuse 14 axial verschoben werden. Der Magnetkern 15 fluchtet mit dem Zuströmstutzen 11, so daß der hier einströmende verflüchtigte Kraftstoff direkt in den Magnetkern 15 gelangt und diesen durchströmt. Das Magnetgehäuse 14 mit Magnetkern 15 ist dabei so in dem topfförmigen Gehäuseteil 101 eingesetzt, daß zwischen dem Außenmantel des Magnetgehäuses 14 und dem Innenmantel des Ventilgehäuses 10 Axialkanäle verbleiben, die in Umfangsrichtung um gleiche Winkel gegeneinander versetzt sind. Im Längsschnitt der Fig. 1 sind nur die beiden sich diametral gegenüberliegenden Axialkanäle 21,22 zu sehen. Die Axialkanäle 21,22 stehen einerseits über einen Ringraum 23, der zwischen dem Ventilgehäuse 10 und dem Außengewindeabschnitt 20 des Magnetkerns 15 verbleibt, mit dem Zuströmstutzen 11 und andererseits über Bohrungen 24, die nahe des offenen Endes des Magnetgehäuses 14 in das Magnetgehäuse 14 eingebracht sind, mit dem Innern des Magnetgehäuses 14 in Verbindung. Durch diese Axialkanäle 21,22 strömt der aus dem Zuströmstutzen 11 austretende verflüchtigte Kraftstoff auch um das Magnetgehäuse 14 und führt hier entstehende Wärme ab.The valve schematically shown in longitudinal section in FIG. 1 for metered admixing of fuel volatilized from the fuel tank of an internal combustion engine to a fuel-air mixture supplied to the internal combustion engine via an intake pipe, hereinafter referred to as a tank ventilation valve, is used in a dispensing system for introducing volatilized fuel into an internal combustion engine. as described in DE 35 19 292 A1. The tank ventilation valve has a two-part valve housing 10 with a cup-shaped housing part 101 and a cap-shaped housing part 102 that terminates this. The housing part 101 carries an inflow connection 11 for connection to a ventilation connection of the fuel tank or to a downstream, filled with activated carbon, storage for the volatilized fuel, while the housing part 102 carries an outflow connection 12 for connection to the intake pipe of the internal combustion engine. Inflow connection 11 and outflow connection 12 are each arranged axially in the housing parts 101 and 102, respectively. An electromagnet 13 is arranged in the interior of the pot-shaped housing part 101. It has a pot-shaped magnet housing 14 with a coaxial, hollow-cylindrical magnetic core 13 penetrating the bottom of the pot and a cylindrical excitation coil 16, which is seated on a coil carrier 17 and in the magnet housing 14 Magnetic core 15 surrounds. At the bottom of the magnet housing 14, an outwardly projecting threaded connector 18 with an internal thread 19 is integrally formed, in which an external thread section 20 is screwed onto the hollow cylindrical magnet core 15. By rotating the magnetic core 15, it can be axially displaced in the magnet housing 14. The magnetic core 15 is aligned with the inflow nozzle 11, so that the volatilized fuel flowing in here passes directly into the magnetic core 15 and flows through it. The magnet housing 14 with the magnetic core 15 is inserted in the cup-shaped housing part 101 in such a way that 10 axial channels remain between the outer jacket of the magnet housing 14 and the inner jacket of the valve housing, which channels are offset from one another in the circumferential direction by the same angle. In the longitudinal section of FIG. 1, only the two diametrically opposite axial channels 21, 22 can be seen. The axial channels 21, 22 are on the one hand via an annular space 23, which remains between the valve housing 10 and the external thread section 20 of the magnetic core 15, with the inflow connector 11 and, on the other hand, via bores 24 which are introduced into the magnet housing 14 near the open end of the magnet housing 14 , in connection with the inside of the magnet housing 14. Through these axial channels 21, 22, the volatilized fuel emerging from the inflow nozzle 11 also flows around the magnet housing 14 and dissipates any heat generated here.

Der Rand des Magnetgehäuses 14 ist nach außen zu einem ringförmigen Auflageflansch 25 abgewinkelt, der endseitig in einen axial vorstehenden Ringsteg 26 umgebogen ist. Der Auflageflansch 25 dient zur Aufnahme eines Rückschlußjoches 27, das das Magnetgehäuse 14 abdeckt und randseitig an dem Ringsteg 26 anliegt. Das in Fig. 2 und 3 im Schnitt und Draufsicht vergrößert dargestellte Rückschlußjoch 27 sitzt mittels zweier Paßlöcher 28 auf zwei Haltezapfen 29 im kappenförmigen Gehäuseteil 102, die auf der dem Gehäuseteil 101 zugekehrten Unterseite axial vorstehen. Beim Verrasten des kappenartigen Gehäuseteils 102 in dem topfartigen Gehäuseteil 101 wird das Rückschlußjoch 27 paßgenau in den Auflageflansch 25 mit Ringsteg 26 eingelegt und darin festgeklemmt. Zwischen dem Auflageflansch 25 und dem Rückschlußjoch 27 wird dabei noch eine Blattfeder 30 aus nichtmagnetischem Material, z.B. aus Bronze eingespannt, die an den Haltezapfen 29 zentriert ist und den Anker des Elektromagneten 13 trägt.The edge of the magnet housing 14 is angled outwards to form an annular support flange 25, which is bent at the end into an axially projecting annular web 26. The support flange 25 serves to receive a yoke 27, which covers the magnet housing 14 and rests against the ring web 26 at the edge. The yoke 27 shown enlarged in section and plan view in FIGS. 2 and 3 is seated by means of two fitting holes 28 on two retaining pins 29 in the cap-shaped housing part 102, which on the Project part 101 facing the underside axially. When the cap-like housing part 102 is locked in the pot-like housing part 101, the yoke 27 is inserted with a precise fit into the support flange 25 with an annular web 26 and clamped therein. A leaf spring 30 made of non-magnetic material, for example made of bronze, is clamped between the support flange 25 and the yoke 27, which is centered on the holding pin 29 and carries the armature of the electromagnet 13.

Der Elektromagnet 13 dient zum getakteten Schalten eines Sitzventils 31, das zwischen dem Zuströmstutzen 11 und dem Abströmstutzen 12 angeordnet ist. Das Sitzventil 31 weist einen Ventildoppelsitz 32 (Fig. 2) auf, der am Grund einer Vertiefung 33 im Rückschlußjoch 27 auf dessen dem Zuströmstutzen 11 zugekehrten Seite angeordnet ist. Die Vertiefung 33 ist dabei so ausgebildet, daß der den Ventildoppelsitz 32 tragende Grund der Vertiefung 33 zum Magnetkern 15 weist. Der Ventildoppelsitz 32 umschließt koaxial außen und innen eine Ringspaltdüse 34, die als zwei symmetrische, halbkreisförmige Bogenspalte 35,36 im Rückschlußjoch 27 ausgebildet ist. Mit dem Ventildoppelsitz 22 wirkt ein Ventilglied in Form einer Ringscheibe 37 aus magnetischem Material zusammen, die zugleich den Anker des Elektromagneten 13 bildet. Die Ringscheibe 37 greift mit einer Zentrierung 38 durch eine kreisförmige Ausnehmung 39 in der Blattfeder 30 und ist an dieser befestigt. Die Ringscheibe 37 ist so dimensioniert, daß ihre axiale Dicke etwas kleiner ist als die lichte Tiefe der Vertiefung 33 und ihr Durchmesser geringfügig kleiner ist als der lichte Durchmesser der Vertiefung 33, so daß zwischen dem Außenumfang der Ringscheibe 37 und dem Innenmantel der Vertiefung 33 nur ein extrem kleiner Ringspalt 40 verbleibt. Die Blattfeder 30 ist so toleriert, daß ein seitliches magnetisches Verkanten der Ringscheibe 37 zuverlässig verhindert ist. Die Ringscheibe 37 trägt auf ihrer im Ventildoppelsitz 32 zugekehrten Seite einen Dichtgummi 41. Im Schließzustand des Sitzventils 31 wird die Ringscheibe 37 mit ihrer mit dem Dichtgummi 41 belegten Seiten durch eine Ventilschließfeder 49 auf den Ventildoppelsitz 32 aufgedrückt. Die Ventilschließfeder 49 stützt sich dazu einerseits an der Ringscheibe 37 und andererseits an einer ringförmigen Stützschulter 50 ab, die an der Innenwand des hohlzylindrischen Magnetkerns 15 ausgebildet ist. Die freie Stirnseite des Magnetkerns 15 bildet einen Anschlag 51 für die Hubbewegung der Ringscheibe 37. Mittels des von Innengewinde 19 und Außengewindeabschnitt 20 gebildeten Einstellgewindes läßt sich der Anschlag 51 axial verschieben und dadurch die Durchflußmenge bei maximal geöffneten Sitzventil 31 festlegen. Die Ventilschließfeder 49 ist klein dimensioniert, da bei Druckgefälle zwischen Abströmstutzen 12 und Zuströmstutzen 11 die Ringspaltdüse 34 eine Saugwirkung auf die Ringscheibe 37 in Richtung Ventilschießen ausübt, die Schließwirkung der Ventilfeder 49 also unterstützt.The electromagnet 13 is used for the clocked switching of a seat valve 31 which is arranged between the inflow nozzle 11 and the outflow nozzle 12. The seat valve 31 has a valve double seat 32 (FIG. 2), which is arranged at the bottom of a recess 33 in the yoke 27 on the side facing the inflow nozzle 11. The recess 33 is designed such that the base of the recess 33 carrying the valve double seat 32 faces the magnetic core 15. The valve double seat 32 coaxially encloses an annular gap nozzle 34 on the outside and inside, which is designed as two symmetrical, semicircular arc gaps 35, 36 in the yoke 27. A valve member in the form of an annular disk 37 made of magnetic material interacts with the valve double seat 22 and at the same time forms the armature of the electromagnet 13. The annular disc 37 engages with a centering 38 through a circular recess 39 in the leaf spring 30 and is attached to this. The annular disc 37 is dimensioned so that its axial thickness is slightly less than the inside depth of the recess 33 and its diameter is slightly smaller than the inside diameter of the recess 33, so that only between the outer circumference of the annular disc 37 and the inner shell of the recess 33 an extremely small annular gap 40 remains. The leaf spring 30 is tolerated so that a lateral magnetic tilting Washer 37 is reliably prevented. The annular disk 37 carries a sealing rubber 41 on its side facing the valve double seat 32. In the closed state of the seat valve 31, the annular disk 37 with its sides covered with the sealing rubber 41 is pressed onto the valve double seat 32 by a valve closing spring 49. For this purpose, the valve closing spring 49 is supported on the one hand on the annular disk 37 and on the other hand on an annular support shoulder 50 which is formed on the inner wall of the hollow cylindrical magnetic core 15. The free end face of the magnetic core 15 forms a stop 51 for the lifting movement of the annular disk 37. The stop thread 51 can be axially displaced by means of the adjusting thread formed by the internal thread 19 and the external thread section 20, and thereby the flow rate can be determined with the seat valve 31 open at the maximum. The valve closing spring 49 is of small dimensions since, in the event of a pressure drop between the outlet connection 12 and the inlet connection 11, the annular gap nozzle 34 exerts a suction effect on the annular disk 37 in the direction of valve firing, thus supporting the closing effect of the valve spring 49.

Die vom Ventildoppelsitz 32 abgekehrte Rückseite des Rückschlußjochs 27 ist durch einen Dichtungsring 42 gegenüber dem Gehäuseteil 102 abgedichtet, so daß Leckverluste über die Verbindung von Rückschlußjoch 27 und Magnetgehäuse 14 vermieden werden. Der Abströmstutzen 12 ist in einem am Gehäuseteil 102 koaxial ausgeformten Abströmstutzen 12 eingerastet. Im Aufnahmestutzen 43 ist auf einer radial nach innen vorspringenden Ringschulter ein Ventilsitz 44 eines Rückschlagventils 45 ausgebildet, auf dem ein Ventilkörper 46 durch eine Ventilfeder 47 aufgepreßt wird. Die Ventilfeder 47 stützt sich in einem im Aufnahmestutzen 43 vorgesehenen Widerlager 48 ab. Das Rückschlagventil 45 ist erforderlich, wenn das Tankentlüftungsventil in sog. Ladermotoren eingesetzt werden soll.The rear side of the yoke 27 facing away from the valve double seat 32 is sealed off from the housing part 102 by a sealing ring 42, so that leakage losses via the connection of the yoke 27 and the magnet housing 14 are avoided. The outflow connector 12 is snapped into an outflow connector 12 which is coaxially formed on the housing part 102. A valve seat 44 of a check valve 45 is formed in the receiving socket 43 on a radially inwardly projecting annular shoulder, on which a valve body 46 is pressed by a valve spring 47. The valve spring 47 is supported in an abutment 48 provided in the receiving socket 43. The check valve 45 is required if the tank ventilation valve is used in so-called loader engines should.

Die Wirkungsweise des vorstehend beschriebenen Tankentlüftungsventils ist wie folgt:The operation of the tank ventilation valve described above is as follows:

Bei stromlosem Elektromagneten 13 ist das Sitzventil 31 geschlossen, da die Ringscheibe 37 mit ihrem Dichtgummi 41 von der Ventilschließfeder 49 auf den Ventildoppelsitz 32 aufgepreßt wird. Bei Betrieb der Brennkraftmaschine wird der Elektromagnet 13 von einer Steuerelektronik getaktet angesteuert. Die Taktfolgefrequenz wird dabei durch den Betriebszustand der Brennkraftmaschine vorgegeben, so daß die über das Sitzventil 31 vom Zuströmstutzen 11 in den Abströmstutzen 12 übertretende Durchflußmenge an verflüchtigtem Kraftstoff entsprechend dosiert wird. Überlagert wird diese elektromagnetische Ansteuerung des Sitzventils 31 durch eine Beeinflussung des Hubs der Ringscheibe 37 aufgrund der Saugwirkung der Ringspaltdüse 34. Je größer die Druckdifferenz zwischen Abströmstutzen 12 und Zuströmstutzen 11 ist, die bei Leerlauf der Brennkraftmaschine ein Maximum erreicht, desto größer ist die Saugwirkung der Ringspaltdüse 34 und damit die auf die Ringscheibe 37 entgegen der Kraft des Elektromagneten 13 wirkende Saugkraft. Mit zunehmender Last der Brennkraftmaschine nimmt der Saugdruck am Abströmstutzen 12 ab und ist bei Vollast minimal. Die Druckdifferenz zwischen Zuströmstutzen 11 und Abströmstutzen 12 ist gering und entsprechend die Saugwirkung der Ringspaltdüse 34. Die Ringscheibe 37 führt bei erregtem Elektromagneten 13 ihren vollen Hub bis zum Anschlag 51 auf. Die dabei durch den Öffnungsquerschnitt hindurchströmende Durchflußmenge kann durch Drehen des Magnetkerns 15 im Einstellgewinde 19,20 hochgenau eingestellt werden.When the electromagnet 13 is de-energized, the seat valve 31 is closed, since the annular disk 37 with its sealing rubber 41 is pressed onto the valve double seat 32 by the valve closing spring 49. When the internal combustion engine is operating, the electromagnet 13 is actuated in a clocked manner by control electronics. The cycle rate is predetermined by the operating state of the internal combustion engine, so that the flow rate of volatilized fuel that passes through the seat valve 31 from the inflow nozzle 11 into the outflow nozzle 12 is metered accordingly. This electromagnetic actuation of the seat valve 31 is superimposed by influencing the stroke of the annular disk 37 due to the suction effect of the annular gap nozzle 34. The greater the pressure difference between the outflow connection 12 and the inflow connection 11, which reaches a maximum when the internal combustion engine is idling, the greater the suction effect of the Annular gap nozzle 34 and thus the suction force acting on the annular disk 37 against the force of the electromagnet 13. With increasing load of the internal combustion engine, the suction pressure at the outflow connection 12 decreases and is minimal at full load. The pressure difference between the inlet nozzle 11 and the outlet nozzle 12 is small and, accordingly, the suction effect of the annular gap nozzle 34. When the electromagnet 13 is energized, the annular disc 37 performs its full stroke up to the stop 51. The flow rate flowing through the opening cross-section can be adjusted very precisely by turning the magnetic core 15 in the setting thread 19, 20.

Die Erfindung ist nicht auf das beschriebene Ausführungsbeispiel beschränkt. So kann die Zentrierung der Blattfeder 30 anstelle am Gehäuseteil 102 auch am Rückschlußjoch 27 mittels gleichartiger Zapfen vorgenommen werden.The invention is not limited to the exemplary embodiment described. The centering of the leaf spring 30 can also be carried out on the yoke 27 instead of on the housing part 102 by means of pins of the same type.

Claims (6)

  1. A valve for the metered admixture of fuel evaporated from the fuel tank of an internal combustion engine into a fuel/air mixture supplied to the internal combustion engine via an induction pipe, having a valve housing (10), which has an inlet mouthpiece (11) for connecting to a ventilation mouthpiece of the fuel tank or to an active carbon reservoir, connected downstream of the fuel tank, for the evaporated fuel and an outlet mouthpiece (12) for connecting to the induction pipe, and having a seat valve arranged inside the valve housing between the inlet mouthpiece and the outlet mouth-piece, which valve seat has a valve double-seat (32) surrounding an annular valve opening (34) and an annular valve element (37) interacting with the valve double-seat (32), which valve element (37) is loaded by a valve closing spring (49) in the valve closing direction and can be actuated by an electromagnet (13) in the valve opening direction, which electromagnet (13) has a cup-type magnet housing (14) arranged coaxially with the valve opening, a hollow cylindrical magnet core (15) arranged centrally in the magnet housing, an exciter coil (16) located in the annular space between the magnet core (15) and the magnet housing (14), a return yoke (27) covering the magnet housing (14) and an armature (37), which is made of magnetically conducting material and forms the valve element, wherein the valve opening (34) is arranged as an annular gap nozzle (34) in the return yoke (27) and the valve double-seat (32) is configured on the end of the return yoke (27) facing towards the inlet mouthpiece (11) and wherein the hollow cylindrical magnet core (15) can be screwed into a setting thread (19, 20) provided in the bottom of the magnet housing (14) and carries an abutment (50) for the valve closing spring (49) supported on the armature (37).
  2. The valve as claimed in claim 1, wherein the annular gap nozzle (34) is arranged in the bottom of a depression (33) in the return yoke (27) and the armature (37) is guided with a slight radial clearance so that it can be axially displaced in the depression (33).
  3. The valve as claimed in claim 2, wherein the armature (37) is fastened on a leaf spring (30) firmly clamped in the valve housing (10) and the leaf spring (30) is toleranced in such a way that tipping of the armature (37) in the depression (33) is reliably prevented.
  4. The valve as claimed in claim 3, wherein the leaf spring (30) consists of non-magnetic material, for example, copper-bronze.
  5. The valve as claimed in one of claims 1-4, wherein there are axial ducts (21, 22) provided between the magnet housing (14) and the valve housing (10), which axial ducts (21, 22) are in connection at one end with the inlet mouthpiece (11) and, at the other end, with the inside of the magnet housing (14) by means of passage openings (24) arranged near the return yoke (27) in the magnet housing (14).
  6. The valve as claimed in one of claims 1-5, wherein a non-return valve (45) is arranged in the valve housing (10) between the outlet mouthpiece (12) and the end of the return yoke (27) facing towards it, the valve seat (44) of this non-return valve (45) being configured on the valve housing (10) and the valve element (46) of this non-return valve (45) being pressed onto the valve seat (44) by a valve spring (47) supported on the outlet mouthpiece (12).
EP19910912517 1990-07-20 1991-07-17 Valve for the metered addition of volatilized fuel to the fuel/air mixture in an internal-combustion engine Expired - Lifetime EP0493555B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4023044 1990-07-20
DE19904023044 DE4023044A1 (en) 1990-07-20 1990-07-20 VALVE FOR THE DOSED ADMINISTRATION OF VOLATILIZED FUEL TO THE FUEL-AIR MIXTURE OF AN INTERNAL COMBUSTION ENGINE
PCT/DE1991/000585 WO1992001862A1 (en) 1990-07-20 1991-07-17 Valve for the metered addition of volatilized fuel to the fuel/air mixture in an internal-combustion engine

Publications (2)

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EP0493555A1 EP0493555A1 (en) 1992-07-08
EP0493555B1 true EP0493555B1 (en) 1994-11-02

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US (1) US5178116A (en)
EP (1) EP0493555B1 (en)
JP (1) JP2911600B2 (en)
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DE (2) DE4023044A1 (en)
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WO (1) WO1992001862A1 (en)

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US5069188A (en) * 1991-02-15 1991-12-03 Siemens Automotive Limited Regulated canister purge solenoid valve having improved purging at engine idle
US5083546A (en) * 1991-02-19 1992-01-28 Lectron Products, Inc. Two-stage high flow purge valve

Also Published As

Publication number Publication date
WO1992001862A1 (en) 1992-02-06
DE4023044A1 (en) 1992-01-23
US5178116A (en) 1993-01-12
EP0493555A1 (en) 1992-07-08
JPH05501440A (en) 1993-03-18
PL167739B1 (en) 1995-10-31
BR9105838A (en) 1992-08-18
DE59103426D1 (en) 1994-12-08
PL291113A1 (en) 1992-08-10
JP2911600B2 (en) 1999-06-23

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