EP2459879B1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
EP2459879B1
EP2459879B1 EP10724490.7A EP10724490A EP2459879B1 EP 2459879 B1 EP2459879 B1 EP 2459879B1 EP 10724490 A EP10724490 A EP 10724490A EP 2459879 B1 EP2459879 B1 EP 2459879B1
Authority
EP
European Patent Office
Prior art keywords
stator
gear
gear pump
layer
annular gear
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.)
Not-in-force
Application number
EP10724490.7A
Other languages
German (de)
French (fr)
Other versions
EP2459879A2 (en
Inventor
Josef Frank
Alexander Fuchs
Klaus Ortner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2459879A2 publication Critical patent/EP2459879A2/en
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Publication of EP2459879B1 publication Critical patent/EP2459879B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/22—Manufacture essentially without removing material by sintering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/56—Bearing bushings or details thereof

Definitions

  • the present invention relates to a gear pump according to the preamble of claim 1.
  • Screw pumps include, inter alia, internal gear and gerotor pumps in which a driving gear is eccentric in the internal toothing of a toothed ring.
  • Internal gear pumps which are particularly suitable for providing high pressures, are used to deliver fluids, such as for example, to deliver fuel to an internal combustion engine.
  • a delivery pump which is integrated in an electric motor.
  • the feed pump comprises a first gear and a second gear. Between the two gears, a delivery chamber is formed.
  • the second gear is stored in its center on a thorn.
  • the first gear is an external gear and forms the rotor, the second gear is an internal gear, which is entrained in the eccentric center of the first gear.
  • the first gear comprises glued permanent magnets, which are distributed over the circumference. External magnetic field generators generate a rotating, rotating field which causes direct motor following of the rotor.
  • EP 1 600 635 A2 An internal gear pump is described which has a pump section with an inner rotor formed on its outer periphery with teeth.
  • An outer rotor has teeth formed on its inner periphery. Both rotors are housed in a housing. The storage of the outer rotor formed as a toothed ring takes place here by means of specially shaped additional components.
  • document JP 2005 098268 A discloses a gear pump with an electrically commutatable stator on which a sliding bearing is provided.
  • document DE 102 48 933 C1 discloses an internal gear pump having an electric drive formed by a ring gear forming the interior of a rotor and a stator disposed adjacent thereto.
  • a gear pump for conveying a fluid having a rotatably mounted externally toothed gear and an internally toothed ring, which are for generating a conveying effect in meshing engagement, and which are arranged together with an electrically commutatable stator in a housing, wherein the stator concentrically around extends around the toothed ring and cooperates with the toothed ring to produce an electromotive force, and wherein the toothed ring has a closed, homogeneous cylindrical surface and provided on the stator a sliding bearing is.
  • the toothed ring made of sintered steel or plastic.
  • the motor is designed as a permanent magnet synchronous motor and the magnets are integrated in the toothed ring.
  • the motor is designed as a reluctance motor and in the toothed ring holes or special recesses are introduced to form magnetic poles by field weakening.
  • the sliding bearing is formed on the stator as a layer applied to a surface of the stator opposite the toothed ring, so that the sliding bearing is integrated into the stator.
  • the stator which may be a stator of a permanent magnet or reluctance motor, therefore advantageously acts on the inner diameter at the same time as a radial bearing for the rotor, which is designed as a toothed ring or outer ring of mecanic leopardrad- or ring gear pump.
  • the sliding bearing serves primarily as a wear protection layer between stator and rotor.
  • the sliding bearing provides a centering function for the rotor and can reduce or prevent axial gap losses with appropriate design. This improves the efficiency of the electric motor.
  • the layer is designed with an extension, so that the stator rests against an inner wall of the housing with a bias voltage.
  • the layer is designed so that the bias acts to push the slide bearing in the axial direction corresponding to the top or against the inner wall when mounting the lid. This results in no or a very small axial air gap and consequently occur only very small gap loss.
  • the layer consists of plastic or of a non-ferromagnetic material, in particular of bronze.
  • the layer has a layer thickness which is less than or equal to 0.3 mm. Since a sliding bearing with a thin layer thickness is integrated into the stator, a correspondingly small air gap between the stator and the rotor can be ensured, in particular in the case of the embodiment with reluctance motor. Consequently, a good efficiency of the electric motor can be displayed.
  • the layer is sprayed, glued or vulcanized onto the stator.
  • Fig. 1 shows a section through an internal gear pump 1 according to the prior art.
  • the internal gear pump 1 comprises a pair of gears, which consists of an internally toothed ring gear 2 and an externally toothed gear 3.
  • the gear 3 is arranged eccentrically to the toothed ring 2 rotatably on a bearing journal 4. If the toothed ring 2 is set in a rotational movement, then the external toothing of the toothed wheel 3 meshes in the internal toothing of the toothed ring 2 and generates a delivery volume flow of the fluid in which the teeth run.
  • the gear pair of the toothed ring 2 and the gear 3 is arranged in a housing 5, wherein the bearing pin 4 is integrally formed or integrally with the housing 5.
  • the toothed ring 2 is also rotatable with a magnetic ring 6, wherein the magnetic ring 6 extends radially around the toothed ring 2.
  • the magnetic ring 6 runs in an inner side of a stator 7, which has an electric winding 8. If the electric winding 8 is commutated electrically by a controller, a circulating magnetic field is generated in the stator 7. Due to the rotating magnetic field of the magnet ring 6 is set in rotation, wherein due to the rotationally fixed connection of the magnet ring 6 with the toothed ring 2, the teeth consisting of the toothed ring 2 and the gear 3 is put into operation.
  • the magnetic ring 6 is slidably mounted on the stator 7.
  • the magnetic ring 6 is provided with a corresponding coating of a suitable sliding material. This design is problematic for the application of high discharge pressures and poorly lubricating liquids such as gasoline or diesel.
  • connection cover 9 The open side of the housing 5 of the internal gear pump 1 is closed by means of a connection cover 9, wherein a sealing element 10 is provided for the fluid-tight sealing of the gaps between the connection cover 9 and the housing 5.
  • the sealing element 10 is designed as an O-ring and is arranged in a corresponding circumferential groove (not shown) within the connection cover 9.
  • Fig. 2 shows a cross section through an internal gear pump 1 according to one embodiment.
  • a plurality of magnets 11 is provided (permanent magnet motor). If the electric motor is alternatively designed as a reluctance motor, then instead of the magnets 11 holes (not shown here) are provided for field weakening.
  • a sliding bearing 13 is provided on a cylindrical surface 12 opposite the toothed ring 2, or the sliding bearing 13 is integrated in the stator 7.
  • the slide bearing 13 serves primarily as a wear protection layer between the stator 7 and the rotor or the toothed ring 2.
  • the slide bearing 13 has a centering function for the rotor or the toothed ring 2 and can reduce or prevent axial gap losses with appropriate design, as in Related to Fig. 3 will be explained in more detail.
  • the sliding bearing 13 is formed by a thin layer of plastic sprayed onto the stator 7.
  • Fig. 3 shows a longitudinal section through the internal gear pump 1 of Fig. 2 ,
  • the sliding bearing 13 which is applied to the stator 7 and injected into the stator 7, is formed as a layer having a thickness of less than 0.3 mm, which axially with respect to an inner wall 14 of the housing 5 with an extension 15 is designed such that a bias by conditioning the layer on the inner wall 14 of the housing 5 is formed.
  • the sliding bearing 13 is pressed in the axial direction against the inner wall 14.
  • this special embodiment of the sliding bearing 13 can be used as an axial circumferential seal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Die vorliegende Erfindung betrifft eine Zahnradpumpe gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a gear pump according to the preamble of claim 1.

Stand der TechnikState of the art

Schraubenpumpen umfassen unter anderem Innenzahnrad- und Zahnringpumpen, bei denen ein treibendes Zahnrad exzentrisch in der Innenverzahnung eines Zahnringes läuft. Innenzahnradpumpen, die besonders zur Bereitstellung hoher Drücke geeignet sind, werden zur Förderung von Fluiden eingesetzt, wie beispielsweise zur Förderung von Kraftstoff zu einer Verbrennungskraftmaschine.Screw pumps include, inter alia, internal gear and gerotor pumps in which a driving gear is eccentric in the internal toothing of a toothed ring. Internal gear pumps, which are particularly suitable for providing high pressures, are used to deliver fluids, such as for example, to deliver fuel to an internal combustion engine.

Im Stand der Technik ist es bekannt, Innenzahnrad- oder Zahnringpumpen in einen elektronisch kommutierten Elektromotor zu integrieren, wobei der Rotor des Elektromotors gleichzeitig als Zahnring der Innenzahnrad- oder Zahnringpumpe ausgebildet ist.In the prior art, it is known to integrate Innenzahnrad- or gerotor pumps in an electronically commutated electric motor, wherein the rotor of the electric motor is simultaneously formed as a toothed ring of Innenzahnrad- or gerotor pump.

In DE 10 2006 007 554 A1 ist eine Förderpumpe beschrieben, welche in einen Elektromotor integriert ist. Die Förderpumpe umfasst ein erstes Zahnrad und ein zweites Zahnrad. Zwischen den beiden Zahnrädern bildet sich ein Förderraum aus. Das zweite Zahnrad lagert in seiner Mitte auf einem Dorn. Das erste Zahnrad ist ein Außenzahnrad und bildet den Rotor, das zweite Zahnrad ist ein Innenzahnrad, welches im außermittigen Zentrum des ersten Zahnrads mitgeschleppt wird. Das erste Zahnrad umfasst eingeklebte Permanentmagnete, die über den Umfang verteilt angeordnet sind. Äußere Magnetfelderzeuger erzeugen ein umlaufendes, sich rotatorisch änderndes Feld, welches das direkte motorische Folgen des Rotors hervorruft.In DE 10 2006 007 554 A1 a delivery pump is described, which is integrated in an electric motor. The feed pump comprises a first gear and a second gear. Between the two gears, a delivery chamber is formed. The second gear is stored in its center on a thorn. The first gear is an external gear and forms the rotor, the second gear is an internal gear, which is entrained in the eccentric center of the first gear. The first gear comprises glued permanent magnets, which are distributed over the circumference. External magnetic field generators generate a rotating, rotating field which causes direct motor following of the rotor.

Problematisch bei derartigen Konfigurationen ist jedoch die Lagerung des Zahnrings, welcher das Antriebsdrehmoment des Elektromotors übernehmen muss. Gleichzeitig müssen die hydraulischen Kräfte der Innenzahnradpumpe auf den Stator und weiter an das Pumpengehäuse übertragen werden.The problem with such configurations, however, is the bearing of the toothed ring, which must take over the driving torque of the electric motor. At the same time, the hydraulic forces of the internal gear pump must be transferred to the stator and further to the pump housing.

In EP 1 600 635 A2 ist eine Innenzahnradpumpe beschrieben, welche einen Pumpenabschnitt mit einem inneren Rotor aufweist, welcher an seiner äußeren Peripherie mit Zähnen ausgebildet ist. Ein äußerer Rotor weist an seiner inneren Peripherie ausgebildete Zähne auf. Beide Rotoren sind in einem Gehäuse aufgenommen. Die Lagerung des als Zahnring ausgebildeten äußeren Rotors erfolgt hierbei mittels speziell geformter Zusatzbauteile.In EP 1 600 635 A2 An internal gear pump is described which has a pump section with an inner rotor formed on its outer periphery with teeth. An outer rotor has teeth formed on its inner periphery. Both rotors are housed in a housing. The storage of the outer rotor formed as a toothed ring takes place here by means of specially shaped additional components.

Dokument JP 2005 098268 A offenbart eine Zahnradpumpe mit einem elektrisch kommutierbaren Stator an dem ein Gleitlager vorgesehen ist.document JP 2005 098268 A discloses a gear pump with an electrically commutatable stator on which a sliding bearing is provided.

Dokument DE 102 48 933 C1 offenbart eine Innenzahnradpumpe mit einem elektrischen Antrieb, der dadurch gebildet ist, dass ein Hohlrad das Innere eines Rotors bildet und dass diesem Rotor benachbart ein Stator angeordnet ist.document DE 102 48 933 C1 discloses an internal gear pump having an electric drive formed by a ring gear forming the interior of a rotor and a stator disposed adjacent thereto.

Dokument GB 2 080 424 A offenbart eine Zahnradpumpe mit einem Gleitlager.document GB 2 080 424 A discloses a gear pump with a sliding bearing.

Die im Stand der Technik bekannten Lösungen zur Lagerung des Zahnrings in einer Innenzahnradpumpe bzw. in einer Zahnringpumpe sind von mechanisch kompliziertem Aufbau und daher konstruktiv aufwändig, komplex und teuer in der Herstellung.The known in the prior art solutions for mounting the ring gear in an internal gear pump or in a gerotor pump are mechanically complicated construction and therefore structurally complex, complex and expensive to manufacture.

Daher ist es erforderlich, eine einfache und kostengünstige Lösung zur Lagerung eines Zahnrings für eine Zahnradpumpe, insbesondere für eine Innenzahnradpumpe oder eine Zahnringpumpe, bereitzustellen.Therefore, it is necessary to provide a simple and inexpensive solution for supporting a toothed ring for a gear pump, in particular for an internal gear pump or a gerotor pump.

Offenbarung der ErfindungDisclosure of the invention Vorteile der ErfindungAdvantages of the invention

Es wird eine Zahnradpumpe zum Fördern eines Fluids mit einem drehbar gelagerten außenverzahnten Zahnrad und einem innenverzahnten Zahnring vorgesehen, welche zur Erzeugung einer Förderwirkung in kämmendem Eingriff stehen, und welche gemeinsam mit einem elektrisch kommutierbaren Stator in einem Gehäuse angeordnet sind, wobei sich der Stator konzentrisch um den Zahnring herum erstreckt und mit dem Zahnring zur Erzeugung einer elektromotorischen Kraft zusammenwirkt, und wobei der Zahnring eine geschlossene, homogene zylindrische Oberfläche besitzt und an dem Stator ein Gleitlager vorgesehen ist. Durch Vorsehen des Gleitlagers direkt an dem Stator wird eine konstruktiv einfache und daher kostengünstige Lösung zur Lagerung vorgesehen.There is provided a gear pump for conveying a fluid having a rotatably mounted externally toothed gear and an internally toothed ring, which are for generating a conveying effect in meshing engagement, and which are arranged together with an electrically commutatable stator in a housing, wherein the stator concentrically around extends around the toothed ring and cooperates with the toothed ring to produce an electromotive force, and wherein the toothed ring has a closed, homogeneous cylindrical surface and provided on the stator a sliding bearing is. By providing the sliding bearing directly on the stator a structurally simple and therefore cost-effective solution for storage is provided.

Vorzugsweise besteht der Zahnring aus Sinterstahl oder Kunststoff.Preferably, the toothed ring made of sintered steel or plastic.

Gemäß einer bevorzugten Ausführungsform ist der Motor als Permanentmagnet-Synchronmotor ausgebildet und die Magneten sind in den Zahnring integriert.According to a preferred embodiment, the motor is designed as a permanent magnet synchronous motor and the magnets are integrated in the toothed ring.

Gemäß einer weiteren bevorzugten Ausführungsform ist der Motor als Reluktanzmotor ausgebildet und in den Zahnring sind Löcher oder spezielle Ausnehmungen eingebracht, um durch Feldschwächung magnetische Pole auszubilden.According to a further preferred embodiment, the motor is designed as a reluctance motor and in the toothed ring holes or special recesses are introduced to form magnetic poles by field weakening.

Das Gleitlager ist an dem Stator als eine auf einer dem Zahnring gegenüberliegenden Oberfläche des Stators aufgebrachte Schicht ausgebildet, so dass das Gleitlager in den Stator integriert wird. Der Stator, welcher ein Stator eines Permanentmagnet- oder Reluktanzmotors sein kann, wirkt daher vorteilhafterweise am Innendurchmesser gleichzeitig als Radiallager für den Rotor, welcher als Zahnring bzw. Außenzahnring der Innenzahnrad- oder Zahnringpumpe gestaltet ist. Das Gleitlager dient primär als Verschleißschutzschicht zwischen Stator und Rotor. Zudem stellt das Gleitlager eine Zentrierfunktion für den Rotor bereit und kann bei entsprechender Auslegung axiale Spaltverluste verringern bzw. verhindern. Dies verbessert den Wirkungsgrad des Elektromotors.The sliding bearing is formed on the stator as a layer applied to a surface of the stator opposite the toothed ring, so that the sliding bearing is integrated into the stator. The stator, which may be a stator of a permanent magnet or reluctance motor, therefore advantageously acts on the inner diameter at the same time as a radial bearing for the rotor, which is designed as a toothed ring or outer ring of Innenzahnrad- or ring gear pump. The sliding bearing serves primarily as a wear protection layer between stator and rotor. In addition, the sliding bearing provides a centering function for the rotor and can reduce or prevent axial gap losses with appropriate design. This improves the efficiency of the electric motor.

Erfindungsgemäß ist die Schicht mit einem Fortsatz ausgeführt, so dass der Stator an einer Innenwand des Gehäuses mit einer Vorspannung anliegt. Insbesondere ist die Schicht so ausgeführt, dass die Vorspannung wirkt, um bei Montage des Deckels das Gleitlager in axialer Richtung entsprechend nach oben bzw. gegen die Innenwand zu drücken. Hierdurch entsteht kein bzw. ein sehr kleiner axialer Luftspalt und demzufolge treten nur sehr geringe Spaltverlust auf.According to the invention, the layer is designed with an extension, so that the stator rests against an inner wall of the housing with a bias voltage. In particular, the layer is designed so that the bias acts to push the slide bearing in the axial direction corresponding to the top or against the inner wall when mounting the lid. This results in no or a very small axial air gap and consequently occur only very small gap loss.

Gemäß einer bevorzugten Ausführungsform besteht die Schicht aus Kunststoff oder aus einem nicht-ferromagnetischen Material, insbesondere aus Bronze.According to a preferred embodiment, the layer consists of plastic or of a non-ferromagnetic material, in particular of bronze.

Gemäß noch einer bevorzugten Ausführungsform weist die Schicht eine Schichtdicke auf, welche kleiner oder gleich 0,3 mm ist. Da in den Stator ein Gleitlager mit dünner Schichtdicke integriert wird, kann insbesondere bei der Ausführung mit Reluktanzmotor ein entsprechend kleiner Luftspalt zwischen dem Stator und dem Rotor sichergestellt werden. Folglich ist ein guter Wirkungsgrad des Elektromotors darstellbar.According to yet a preferred embodiment, the layer has a layer thickness which is less than or equal to 0.3 mm. Since a sliding bearing with a thin layer thickness is integrated into the stator, a correspondingly small air gap between the stator and the rotor can be ensured, in particular in the case of the embodiment with reluctance motor. Consequently, a good efficiency of the electric motor can be displayed.

Gemäß noch einer weiteren bevorzugten Ausführungsform ist die Schicht auf den Stator aufgespritzt, aufgeklebt oder darauf vulkanisiert.According to yet another preferred embodiment, the layer is sprayed, glued or vulcanized onto the stator.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Nachfolgenden werden Ausführungsbeispiele der Erfindung unter Bezugnahme auf die beigefügten Zeichnungen näher beschrieben. Es zeigt:

Fig. 1
einen Schnitt durch eine Innenzahnradpumpe gemäß dem Stand der Technik,
Fig. 2
einen Querschnitt durch eine Innenzahnradpumpe gemäß einer Ausführungsform;
Fig. 3
einen Längsschnitt durch die Innenzahnradpumpe von Fig. 2.
Hereinafter, embodiments of the invention will be described in more detail with reference to the accompanying drawings. It shows:
Fig. 1
a section through an internal gear pump according to the prior art,
Fig. 2
a cross section through an internal gear pump according to an embodiment;
Fig. 3
a longitudinal section through the internal gear pump of Fig. 2 ,

Ausführungsformen der ErfindungEmbodiments of the invention

In Fig. 1 zeigt einen Schnitt durch eine Innenzahnradpumpe 1 gemäß dem Stand der Technik. Die Innenzahnradpumpe 1 umfasst ein Zahnradpaar, welches aus einen innenverzahnten Zahnring 2 und einem außenverzahnten Zahnrad 3 besteht. Das Zahnrad 3 ist exzentrisch zum Zahnring 2 drehbar auf einem Lagerzapfen 4 angeordnet. Wird der Zahnring 2 in eine Drehbewegung versetzt, so kämmt die Außenverzahnung des Zahnrads 3 in der Innenverzahnung des Zahnrings 2 und erzeugt einen Fördervolumenstrom des Fluids, in welchem die Verzahnung läuft. Das Zahnradpaar aus dem Zahnring 2 und dem Zahnrad 3 ist in einem Gehäuse 5 angeordnet, wobei der Lagerzapfen 4 einteilig bzw. integral mit dem Gehäuse 5 ausgebildet ist. Der Zahnring 2 ist darüber hinaus drehfest mit einem Magnetring 6 verbunden, wobei sich der Magnetring 6 um den Zahnring 2 radial umlaufend erstreckt. Der Magnetring 6 läuft in einer Innenseite eines Stators 7, welcher eine Elektrowicklung 8 aufweist. Wird die Elektrowicklung 8 durch eine Steuerung elektrisch kommutiert, so wird im Stator 7 ein umlaufendes Magnetfeld erzeugt. Aufgrund des umlaufenden Magnetfeldes wird der Magnetring 6 in Rotation versetzt, wobei aufgrund der drehfesten Verbindung des Magnetrings 6 mit dem Zahnring 2 auch die Verzahnung bestehend aus dem Zahnring 2 und dem Zahnrad 3 in Betrieb gesetzt wird. Der Magnetring 6 ist an dem Stator 7 gleitend gelagert. Hierbei ist der Magnetring 6 mit einer entsprechenden Beschichtung aus einem geeigneten Gleitmaterial versehen. Diese Ausführung ist für die Anwendung hoher Förderdrücke und bei schlecht schmierenden Flüssigkeiten, wie beispielsweise Benzin oder Diesel, problematisch.In Fig. 1 shows a section through an internal gear pump 1 according to the prior art. The internal gear pump 1 comprises a pair of gears, which consists of an internally toothed ring gear 2 and an externally toothed gear 3. The gear 3 is arranged eccentrically to the toothed ring 2 rotatably on a bearing journal 4. If the toothed ring 2 is set in a rotational movement, then the external toothing of the toothed wheel 3 meshes in the internal toothing of the toothed ring 2 and generates a delivery volume flow of the fluid in which the teeth run. The gear pair of the toothed ring 2 and the gear 3 is arranged in a housing 5, wherein the bearing pin 4 is integrally formed or integrally with the housing 5. The toothed ring 2 is also rotatable with a magnetic ring 6, wherein the magnetic ring 6 extends radially around the toothed ring 2. The magnetic ring 6 runs in an inner side of a stator 7, which has an electric winding 8. If the electric winding 8 is commutated electrically by a controller, a circulating magnetic field is generated in the stator 7. Due to the rotating magnetic field of the magnet ring 6 is set in rotation, wherein due to the rotationally fixed connection of the magnet ring 6 with the toothed ring 2, the teeth consisting of the toothed ring 2 and the gear 3 is put into operation. The magnetic ring 6 is slidably mounted on the stator 7. Here, the magnetic ring 6 is provided with a corresponding coating of a suitable sliding material. This design is problematic for the application of high discharge pressures and poorly lubricating liquids such as gasoline or diesel.

Die offene Seite des Gehäuses 5 der Innenzahnradpumpe 1 wird mittels eines Anschlussdeckels 9 verschlossen, wobei zur fluiddichten Abdichtung der Spalte zwischen dem Anschlussdeckel 9 und dem Gehäuse 5 ein Dichtelement 10 vorgesehen ist. Das Dichtelement 10 ist als O-Ring ausgeführt und ist in einer entsprechenden umlaufenden Nut (nicht dargestellt) innerhalb des Anschlussdeckels 9 angeordnet.The open side of the housing 5 of the internal gear pump 1 is closed by means of a connection cover 9, wherein a sealing element 10 is provided for the fluid-tight sealing of the gaps between the connection cover 9 and the housing 5. The sealing element 10 is designed as an O-ring and is arranged in a corresponding circumferential groove (not shown) within the connection cover 9.

Fig. 2 zeigt einen Querschnitt durch eine Innenzahnradpumpe 1 gemäß einer Ausführungsform. An bzw. in dem als Rotor wirkenden Zahnring 2 ist einer Vielzahl von Magneten 11 versehen (Permanentmagnetmotor). Wenn der Elektromotor alternativ als Reluktanzmotor ausgebildet ist, dann sind anstelle der Magneten 11 hier nicht dargestellte Löcher zur Feldschwächung vorgesehen. Fig. 2 shows a cross section through an internal gear pump 1 according to one embodiment. At or in which acts as a rotor toothed ring 2 a plurality of magnets 11 is provided (permanent magnet motor). If the electric motor is alternatively designed as a reluctance motor, then instead of the magnets 11 holes (not shown here) are provided for field weakening.

An dem Stator 7 ist an einer dem Zahnring 2 gegenüberliegenden zylindrischen Oberfläche 12 ein Gleitlager 13 vorgesehen bzw. das Gleitlager 13 ist in den Stator 7 integriert. Das Gleitlager 13 dient primär als Verschleißschutzschicht zwischen dem Stator 7 und dem Rotor bzw. dem Zahnring 2. Zudem weist das Gleitlager 13 eine Zentrierfunktion für den Rotor bzw. den Zahnring 2 auf und kann bei entsprechender Auslegung axiale Spaltverluste verringern bzw. verhindern, wie in Zusammenhang mit Fig. 3 noch näher erläutert wird. Das Gleitlager 13 wird durch eine dünne Schicht aus auf den Stator 7 aufgespritztem Kunststoff gebildet.On the stator 7, a sliding bearing 13 is provided on a cylindrical surface 12 opposite the toothed ring 2, or the sliding bearing 13 is integrated in the stator 7. The slide bearing 13 serves primarily as a wear protection layer between the stator 7 and the rotor or the toothed ring 2. In addition, the slide bearing 13 has a centering function for the rotor or the toothed ring 2 and can reduce or prevent axial gap losses with appropriate design, as in Related to Fig. 3 will be explained in more detail. The sliding bearing 13 is formed by a thin layer of plastic sprayed onto the stator 7.

Fig. 3 zeigt einen Längsschnitt durch die Innenzahnradpumpe 1 von Fig. 2. Hier ist erkennbar, dass das Gleitlager 13, welches auf den Stator 7 aufgebracht bzw. in den Stator 7 eingespritzt ist, als Schicht mit einer Dicke von kleiner 0,3 mm ausgebildet ist, welche axial in Richtung zu einer Innenwand 14 des Gehäuses 5 mit einem Fortsatz 15 derartig ausgeführt ist, dass eine Vorspannung durch Anlage der Schicht an der Innenwand 14 des Gehäuses 5 entsteht. Bei Montage des Anschlussdeckels 9 wird das Gleitlager 13 in axialer Richtung gegen die Innenwand 14 gedrückt. Somit kann der Stator 7 axial fixiert werden. Desweiteren kann diese spezielle Ausführung des Gleitlagers 13 als axiale umlaufende Abdichtung verwendet werden. Fig. 3 shows a longitudinal section through the internal gear pump 1 of Fig. 2 , Here it can be seen that the sliding bearing 13, which is applied to the stator 7 and injected into the stator 7, is formed as a layer having a thickness of less than 0.3 mm, which axially with respect to an inner wall 14 of the housing 5 with an extension 15 is designed such that a bias by conditioning the layer on the inner wall 14 of the housing 5 is formed. When mounting the connection cover 9, the sliding bearing 13 is pressed in the axial direction against the inner wall 14. Thus, the stator 7 can be axially fixed. Furthermore, this special embodiment of the sliding bearing 13 can be used as an axial circumferential seal.

Bei der Zahnradpumpe 1 gemäß der Erfindung wird eine konstruktiv einfache und somit kostengünstige Gleitlagerung vorgesehen.In the gear pump 1 according to the invention, a structurally simple and thus inexpensive slide bearing is provided.

Claims (7)

  1. Gear pump (1) for delivering a fluid having a rotatably mounted externally toothed gearwheel (3) and an internally toothed annular gear (2) which are in meshing engagement with one another in order to generate a delivery action and which are arranged together with an electrically commutatable stator (7) in a housing (5), the stator (7) extending concentrically around the annular gear (2) and interacting with the annular gear in order to generate an electromotive force, the annular gear (2) having a closed, homogeneous cylindrical surface and a sliding bearing (13) being provided on the stator (7), the sliding bearing (13) being formed on the stator (7) as a layer which is applied on a surface (12) of the stator (7), which surface (12) lies opposite the annular gear (2), characterized in that the layer is configured with a projection (15), with the result that the stator (7) bears with a prestress against an inner wall (14) of the housing (5).
  2. Gear pump (1) according to Claim 1, characterized in that the layer is composed of plastic or of a non-ferromagnetic material, in particular of bronze.
  3. Gear pump (1) according to Claim 1 or 2, characterized in that the layer has a layer thickness which is less than or equal to 0.3 mm.
  4. Gear pump (1) according to Claims 1 to 3, characterized in that the layer is injection-moulded, adhesively bonded or vulcanized onto the stator (7).
  5. Gear pump (1) according to Claims 1 to 4, characterized in that the annular gear (2) is composed of sintered steel or plastic.
  6. Gear pump (1) according to Claims 1 to 5, characterized in that the motor is configured as a permanent-magnet synchronous motor and the magnets (11) are integrated into the annular gear (2).
  7. Gear pump (1) according to Claims 1 to 5, characterized in that the motor is configured as a reluctance motor and holes or recesses are made in the annular gear (2), in order to form magnetic poles by way of field weakening.
EP10724490.7A 2009-07-31 2010-06-04 Gear pump Not-in-force EP2459879B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009028148A DE102009028148A1 (en) 2009-07-31 2009-07-31 gear pump
PCT/EP2010/057820 WO2011012362A2 (en) 2009-07-31 2010-06-04 Gear pump

Publications (2)

Publication Number Publication Date
EP2459879A2 EP2459879A2 (en) 2012-06-06
EP2459879B1 true EP2459879B1 (en) 2013-08-14

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Application Number Title Priority Date Filing Date
EP10724490.7A Not-in-force EP2459879B1 (en) 2009-07-31 2010-06-04 Gear pump

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US (1) US9163626B2 (en)
EP (1) EP2459879B1 (en)
JP (1) JP5563078B2 (en)
CN (1) CN102483057B (en)
DE (1) DE102009028148A1 (en)
ES (1) ES2426474T3 (en)
RU (1) RU2543106C2 (en)
WO (1) WO2011012362A2 (en)

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Also Published As

Publication number Publication date
JP2013500428A (en) 2013-01-07
WO2011012362A3 (en) 2011-12-22
EP2459879A2 (en) 2012-06-06
DE102009028148A1 (en) 2011-02-03
RU2543106C2 (en) 2015-02-27
ES2426474T3 (en) 2013-10-23
US9163626B2 (en) 2015-10-20
WO2011012362A2 (en) 2011-02-03
CN102483057A (en) 2012-05-30
JP5563078B2 (en) 2014-07-30
CN102483057B (en) 2015-05-20
RU2012107226A (en) 2013-09-10
US20120171061A1 (en) 2012-07-05

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