WO2002077458A1 - Self-centering gear pump - Google Patents

Self-centering gear pump Download PDF

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Publication number
WO2002077458A1
WO2002077458A1 PCT/EP2002/002253 EP0202253W WO02077458A1 WO 2002077458 A1 WO2002077458 A1 WO 2002077458A1 EP 0202253 W EP0202253 W EP 0202253W WO 02077458 A1 WO02077458 A1 WO 02077458A1
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WO
WIPO (PCT)
Prior art keywords
gear
drive shaft
drive
drive gear
housing
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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.)
Ceased
Application number
PCT/EP2002/002253
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German (de)
French (fr)
Inventor
Dieter Brox
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BUCHRUCKER KARL
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BUCHRUCKER KARL
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Publication date
Application filed by BUCHRUCKER KARL filed Critical BUCHRUCKER KARL
Priority to US10/472,456 priority Critical patent/US20040136856A1/en
Priority to EP02724189A priority patent/EP1370771A1/en
Priority to CA002441596A priority patent/CA2441596A1/en
Publication of WO2002077458A1 publication Critical patent/WO2002077458A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F04C2/10—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
    • F04C2/103—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 one member having simultaneously a rotational movement about its own axis and an orbital movement

Definitions

  • the invention relates to a self-centering gear pump, in particular for conveying and metering flowable pastes and liquids, but in a wide variety of temperature ranges during the conveying process, by means of an externally toothed plastic drive gear, which is plugged onto a centrally arranged, smooth motor shaft, without a positive connection, and an internally meshing, eccentrically to the motor shaft Ring gear revolving within a circular housing, which is closed on both sides by the housing side walls, but is slidingly abutting the inner wall on the ring gear and the drive gearwheel with little running play, the side wall facing away from the motor containing an inlet and an outlet opening for the passage of the liquids through the pump.
  • the invention specified in claim 1 is based on the object of designing a self-centering gear pump which can self-priming, flowable pastes and non-lubricating liquids even when used in a wide variety of temperature ranges and metered and metered.
  • the claim 1 of the invention enables a constant functionality with expansion coefficients of the same material, whereby an axial thrust with longitudinal expansion of the drive shaft 3 is not transmitted to the drive gear 4 carried by it.
  • Radial thermal expansion of the drive gear 4 and the floating ring gear 8 is absorbed and compensated for by the existing suction-side clearance 16 within the slot-shaped housing interior. Axially and radially, the rotating toothing elements can slide and position themselves in their optimal position for every temperature range during the work process.
  • the self-centering gear pump consists of a circular housing interior which is designed slightly as an elongated hole between the central axis 17 and 18 and in which a rotatable, centrally mounted smooth drive shaft 3 carries an axially displaceable drive gear 4 made of plastic without a positive connection.
  • a smooth drive shaft 3 rotates in the direction of the arrow about the fixed center point 5
  • the resulting torque is abruptly used by means of a roller freewheel 6 for the non-positive connection between the drive shaft 3 and gear hub 7 within the drive gear 4 and takes it into its rotational movement in accordance with the direction of rotation.
  • the drive gear 4 which is constantly in meshing engagement with the overhung internal gear ring 8, which has one more tooth, makes a circular orbital movement around the fixed center 5, while at the same time making the ring gear inside the wall of the semicircle 10 in the housing inner wall 8 circumferentially slides.
  • the difference in the number of teeth 1 between the drive gear 4 and the ring gear 8 causes a relative movement between the two, as a result of which constantly changing cavities 11 form, which expand on the suction side from zero to the greatest extent and decrease on the pressure side again to zero, which causes the liquid to be conveyed is sucked into the pump interior via the pump inlet 12 and the overflow channel 13 and is displaced again on the pressure side through the overflow channel 14 to the pump outlet 15.
  • Figure 1 shows a sectional view of the front view of a self-centering gear pump.
  • Figure 2 shows a front view of a self-centering gear pump with the housing cover on.
  • FIG. 3 shows a sectional illustration in the course A - A according to FIG. 2 of a self-centering gear pump.
  • the smooth drive shaft 3 By driving the smooth drive shaft 3 in the direction of the arrow around the fixed center point 5, the resulting torque abruptly establishes the non-positive connection between the drive shaft 3 and the gear hub 7 by means of the roller freewheel 6 and the axially attached drive gear 4 and brings the drive gear 4 into a rotational movement.
  • the constant mesh 9 is one more tooth internally toothed ring gear 8 also slidably rotated along the inner-walled semicircle 10 of the housing 1.
  • the difference in the number of teeth 1 between the drive gear 4 and the ring gear 8 generates a relative movement between the two and forms cavities 11 which expand their volume on the suction side from zero to the greatest extent and on the pressure side again to zero, which causes the liquid to be conveyed to pass through the pump inlet 12 and the overflow channel 13 is sucked into the pump interior and is displaced on the pressure side through the overflow channel 14 to the pump outlet 15.

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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)

Abstract

The invention relates to a self-centering gear pump, in particular for conveying and metering free-flowing pastes and liquids, but operating within various temperature ranges during the conveying process by means of a drive gear mounted axially on a central smooth motor shaft without a positive-fit connection and an excentrically located hollow gear that meshes on its interior face and rotates within a cylindrical housing. Said housing is closed on both sides by lateral walls.

Description

Selbstzentrierende Zahnradpumpe Self-centering gear pump

Beschreibungdescription

Die Erfindung betrifft eine selbstzentrierende Zahnradpumpe, insbesondere zur Förderung und Dosierung fließfähiger Pasten und Flüssigkeiten, jedoch in unterschiedlichsten Temperaturbereichen während des Fördervorganges, mittels einem auf einer zentrisch angeordneten glatten Motorwelle aufgesteckten außenverzahnten Kunststoff-Antriebszahnrad ohne formschlüssige Verbindung und einem exzentrisch zur Motorwelle inn- wandig kämmenden Hohlrad umlaufend innerhalb eines kreisförmigen Gehäuses, welches beidseitig durch Gehäuseseitenwände abgeschlossen, aber planseitig innwandig am Hohlrad und am Antriebszahnrad mit geringem Laufspiel gleitend anliegend ist, wobei die vom Motor abgewandte Seitenwand eine Einlaß- und eine Auslaßöffnung für den Durchlauf der Flüssigkeiten durch die Pumpe enthält.The invention relates to a self-centering gear pump, in particular for conveying and metering flowable pastes and liquids, but in a wide variety of temperature ranges during the conveying process, by means of an externally toothed plastic drive gear, which is plugged onto a centrally arranged, smooth motor shaft, without a positive connection, and an internally meshing, eccentrically to the motor shaft Ring gear revolving within a circular housing, which is closed on both sides by the housing side walls, but is slidingly abutting the inner wall on the ring gear and the drive gearwheel with little running play, the side wall facing away from the motor containing an inlet and an outlet opening for the passage of the liquids through the pump.

Bei dieser Art Maschinen mit fliegend gelagertem Hohlrad und ortsfest umlaufenden Antriebszahnrad bedarf es, um optimale Fördergenauigkeiten zu erreichen, besonderer Mittel und Vorkehrungen.In this type of machine with a flywheel ring gear and a stationary rotating drive gear, special means and precautions are required to achieve optimum conveying accuracy.

Bekannt ist zum Beispiel, daß Hohlrad und Antriebszahnrad durch seitlich mit Federkraft beaufschlagte Steinwände abdichten (DE 451437 C). Bei anderen Maschinen mit vertikaler Aufstellung dichtet die Eigenlast der rotierenden Läufer (US 1,631,592) ab.It is known, for example, that the ring gear and drive gear seal by means of stone walls laterally loaded with spring force (DE 451437 C). In other machines with vertical installation, the dead load of the rotating rotor seals (US 1,631,592).

Da aber die rotierenden Verdrängerelemente zwecks leichter Beweglichkeit auch für nichtschmierende Flüssigkeiten und im Falle einer größeren Wärmedehnung rotieren sollen, ist eine besondere Abstufung von Pumpen für verschiedene Temperaturbereiche unbedingt erforderlich. Der im Anspruch 1 angegebenen Erfindung liegt die Aufgabe zu Grunde, eine sich selbst zentrierende Zahnradpumpe zu gestalten, die selbstansaugend fließfähige Pasten und auch nichtschmierende Flüssigkeiten selbst beim Einsatz in verschiedensten Temperaturbereichen gleichbleibend fordern und dosieren kann.However, since the rotating displacement elements should also rotate for non-lubricating liquids and in the event of greater thermal expansion in order to facilitate mobility, a special gradation of pumps for different temperature ranges is absolutely necessary. The invention specified in claim 1 is based on the object of designing a self-centering gear pump which can self-priming, flowable pastes and non-lubricating liquids even when used in a wide variety of temperature ranges and metered and metered.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Eine bevorzugte Ausfύhrungsform der Erfindung ergibt sich aus den Merkmalen des Anspruchs 2.A preferred embodiment of the invention results from the features of claim 2.

Der Anspruch 1 der Erfindung ermöglicht bei wachsender Wärmedehnung auch mit größeren Temperaturdifferenzen eine gleichbleibende Funktionsfähigkeit mit werkstoffmäßig gleichen Ausdehnungskoeffizienten, wobei ein Axialschub bei Längendehnung der Antriebswelle 3 nicht auf das von dieser getragene Antriebszahnrad 4 übertragen wird. Eine radiale Wärmedehnung von Antriebszahnrad 4 und dem fliegend umlaufenden elastischen Hohlrad 8 wird von dem vorhandenen saugseitigen Freiraum 16 innerhalb des langlochförmigen Gehäuseinnenraums aufgenommen und kompensiert. Axial wie radial können somit die rotierenden Verzahnungselemente während des Arbeitsablaufs gleitend für jeden Temperaturbereich sich selbst in ihre optimale Lage einpendeln und positionieren.With increasing thermal expansion even with larger temperature differences, the claim 1 of the invention enables a constant functionality with expansion coefficients of the same material, whereby an axial thrust with longitudinal expansion of the drive shaft 3 is not transmitted to the drive gear 4 carried by it. Radial thermal expansion of the drive gear 4 and the floating ring gear 8 is absorbed and compensated for by the existing suction-side clearance 16 within the slot-shaped housing interior. Axially and radially, the rotating toothing elements can slide and position themselves in their optimal position for every temperature range during the work process.

Die selbstzentrierende Zahnradpumpe besteht aus einem kreisförmigen geringfügig als Langloch zwischen Mittelachse 17 und 18 ausgebildeten Gehäuseinnenraum, in dem eine drehbare, zentrisch gelagerte glatte Antriebswelle 3 ohne formschlüssige Verbindung ein axial verschiebbares Antriebszahnrad 4 aus Kunststoff trägt. Bei Drehung der glatten Antriebswelle 3 in Pfeilrichtung um den ortsfesten Mittelpunkt 5 wird mittels eines Rollenfreilaufs 6 das entstandene Drehmoment schlagartig zur kraftschlüssigen Verbindung zwischen Antriebswelle 3 und Zahnradnabe 7 innerhalb des Antriebszahnrades 4 genutzt und nimmt entsprechend der Drehrichtung dieses in seine Drehbewegung mit. Das Antriebszahnrad 4, welches ständig mit dem fliegend gelagerten, einen Zahn mehr aufweisenden, innenverzahnten Hohlrad 8 im Zahneingriff 9 steht, macht um den ortsfesten Mittelpunkt 5 eine kreisförmige Umlaufbewegung, während gleichzeitig innwan- dig entlang der Wandung des Halbkreises 10 in der Gehäuseinnenwand das Hohlrad 8 umlaufend gleitet.The self-centering gear pump consists of a circular housing interior which is designed slightly as an elongated hole between the central axis 17 and 18 and in which a rotatable, centrally mounted smooth drive shaft 3 carries an axially displaceable drive gear 4 made of plastic without a positive connection. When the smooth drive shaft 3 rotates in the direction of the arrow about the fixed center point 5, the resulting torque is abruptly used by means of a roller freewheel 6 for the non-positive connection between the drive shaft 3 and gear hub 7 within the drive gear 4 and takes it into its rotational movement in accordance with the direction of rotation. The drive gear 4, which is constantly in meshing engagement with the overhung internal gear ring 8, which has one more tooth, makes a circular orbital movement around the fixed center 5, while at the same time making the ring gear inside the wall of the semicircle 10 in the housing inner wall 8 circumferentially slides.

Die Zähnezahldifferenz 1 zwischen Antriebszahnrad 4 und Hohlrad 8 bewirkt eine Relativbewegung zwischen beiden, wodurch sich sich ständig ändernde Hohlräume 11 bilden, welche sich saugseitig von null bis zur größten Ausdehnung erweitern und druckseitig wieder bis auf null verkleinern, was bewirkt, dass die zu fördernde Flüssigkeit über den Pumpeneingang 12 und den Überströmkanal 13 in das Pumpeninnere angesaugt wird und druckseitig durch den Überströmkanal 14 zum Pumpenausgang 15 wieder verdrängt wird.The difference in the number of teeth 1 between the drive gear 4 and the ring gear 8 causes a relative movement between the two, as a result of which constantly changing cavities 11 form, which expand on the suction side from zero to the greatest extent and decrease on the pressure side again to zero, which causes the liquid to be conveyed is sucked into the pump interior via the pump inlet 12 and the overflow channel 13 and is displaced again on the pressure side through the overflow channel 14 to the pump outlet 15.

Die Erfindung wird nachfolgend an einem Ausfuhrungsbeispiel noch weiter erläutert und anhand von Zeichnungen dargestellt.The invention is explained in more detail below using an exemplary embodiment and illustrated with the aid of drawings.

Figur 1 zeigt eine Schnittdarstellung der Vorderansicht einer selbstzentrierenden Zahnradpumpe.Figure 1 shows a sectional view of the front view of a self-centering gear pump.

Figur 2 zeigt eine Vorderansicht einer selbstzentrierenden Zahnradpumpe mit aufliegendem Gehäusedeckel.Figure 2 shows a front view of a self-centering gear pump with the housing cover on.

Figur 3 zeigt eine Schnittdarstellung im Verlauf A - A nach Figur 2 einer selbstzentrierenden Zahnradpumpe.FIG. 3 shows a sectional illustration in the course A - A according to FIG. 2 of a self-centering gear pump.

Durch Antrieb der glatten Antriebswelle 3 in Pfeilrichtung um den ortsfesten Mittelpunkt 5 stellt mittels des Rollenfreilaufs 6 und des axial aufgesteckten Antriebszahnrads 4 das entstandene Drehmoment schlagartig die kraftschlüssige Verbindung zwischen Antriebswelle 3 und Zahnradnabe 7 her und bringt das Antriebszahnrad 4 in eine Drehbewegung. Über den ständigen Zahneingriff 9 wird das einen Zahn mehr aufweisende innenverzahnte Hohlrad 8 gleitend entlang des innwandigen Halbkreises 10 des Gehäuses 1 ebenfalls in Drehung versetzt. Die Zähnezahldifferenz 1 zwischen Antriebszahnrad 4 und Hohlrad 8 erzeugt eine Relativbewegung zwischen beiden und bildet Hohlräume 11 welche ihren Rauminhalt saugseitig von null bis zur größten Ausdehnung erweitem und druckseitig wieder bis auf null verkleinem, was bewirkt, dass die zu fördernde Flüssigkeit über den Pumpeneingang 12 und den Überströmkanal 13 in das Pumpeninnere angesaugt wird und druckseitig durch den Überströmkanal 14 zum Pumpenausgang 15 wieder verdrängt wird. By driving the smooth drive shaft 3 in the direction of the arrow around the fixed center point 5, the resulting torque abruptly establishes the non-positive connection between the drive shaft 3 and the gear hub 7 by means of the roller freewheel 6 and the axially attached drive gear 4 and brings the drive gear 4 into a rotational movement. About the constant mesh 9 is one more tooth internally toothed ring gear 8 also slidably rotated along the inner-walled semicircle 10 of the housing 1. The difference in the number of teeth 1 between the drive gear 4 and the ring gear 8 generates a relative movement between the two and forms cavities 11 which expand their volume on the suction side from zero to the greatest extent and on the pressure side again to zero, which causes the liquid to be conveyed to pass through the pump inlet 12 and the overflow channel 13 is sucked into the pump interior and is displaced on the pressure side through the overflow channel 14 to the pump outlet 15.

Claims

Patentansprüche claims 1. Selbstzentrierende Zahnradpumpe mit folgenden Merkmalen:1. Self-centering gear pump with the following features: a) in einem zylinderförmigen Gehäuse (1) wird durch eine glatte, kreisrunde, drehbar gelagerte Antriebswelle (3) ein axial mit der Zahnradnabe (7) aufsteckbares Antriebszahnrad (4) aus Kunststoff getragen;a) in a cylindrical housing (1) is carried by a smooth, circular, rotatably mounted drive shaft (3) an axially with the gear hub (7) attachable drive gear (4) made of plastic; b) das Antriebszahnrad (4) ist mit einer kraftschlüssigen Verbindung zur Zahnradnabe (7) nicht lösbar fest verbunden;b) the drive gear (4) is non-releasably connected with a non-positive connection to the gear hub (7); c) durch Antrieb der Antriebswelle (3) um den ortsfesten Mittelpunkt (5) stellt ein entstandenes Drehmoment mittels des Rollenfreilaufs (6) schlagartig die kraftschlüssige Verbindung zwischen Antriebswelle (3) und Zahnradnabe (7) her, wobei sich Rollen des Rollenfreilaufs (6) über den gesamten Umfang an der glatten Oberfläche der Antriebswelle (3) verklammem, aber bei Stillstand der Antriebswelle (3) wieder lösen;c) by driving the drive shaft (3) around the fixed center point (5), a torque created by means of the roller freewheel (6) suddenly creates the non-positive connection between the drive shaft (3) and the gear hub (7), with rollers of the roller freewheel (6) Clamp the entire circumference on the smooth surface of the drive shaft (3), but release it again when the drive shaft (3) is at a standstill; d) über den ständigen Zahneingriff (9) wird das einen Zahn mehr aufweisende Hohlrad (8) gleitend entlang des innwandigen Halbkreises (10) innerhalb des Gehäuses (1) in eine relative Drehbewegung zum antreibenden Antriebszahnrad (4) versetzt;d) via the constant tooth engagement (9), the ring gear (8), which has one more tooth, is slidably set in a relative rotary motion to the driving drive gear (4) along the inner semicircle (10) within the housing (1); e) das zylinderfbrmige Gehäuse (1) hat einen kreisförmigen geringfügig, als Langloch ausgebildeten Gehäuseinnenraum bei dem die innere Wandung zwischen den Mittelachsen (17) und (18) als kurze Gerade ausgebildet ist;e) the cylindrical housing (1) has a circular, slightly, as an elongated hole housing interior in which the inner wall between the central axes (17) and (18) is designed as a short straight line; f) bei betriebsbedingter Materialerwärmung werden radiale Wärmedehnungen vom elastischen Hohlrad (8) bzw. Antriebszahnrad (4) in den vorhandenen Freiraum (16) verlagert und kompensiert; g) eine axiale Längendehnung bei Erwärmung der Antriebswelle (3) wird bei Verwendung des Rollenfreilaufs (6) durch diesen die axiale Verschiebemöglichkeit des Antriebszahnrades (4) auf der glatten Antriebswelle (3) zur Kompensation der Längenausdehnung genutzt;f) in the case of operational material heating, radial thermal expansions from the elastic ring gear (8) or drive gear (4) are shifted into the available space (16) and compensated; g) an axial longitudinal expansion when the drive shaft (3) heats up, when the roller freewheel (6) is used, the axial displacement possibility of the drive gear (4) on the smooth drive shaft (3) is used to compensate for the linear expansion; 2. Selbstzentrierende Zahnradpumpe mit folgenden Merkmalen:2. Self-centering gear pump with the following features: a) in einem zylinderförmigen Gehäuse (1) wird durch eine glatte, kreisrunde, drehbar gelagerte Antriebswelle (3) ein axial mit der Zahnradnabe (7) aufsteckbares Antriebszahnrad (4) aus Kunststoff getragen;a) in a cylindrical housing (1) is carried by a smooth, circular, rotatably mounted drive shaft (3) an axially with the gear hub (7) attachable drive gear (4) made of plastic; b) das Antriebszahnrad (4) ist mit einer kraftschlüssigen Verbindung zur Zahnradnabe (7) nicht lösbar fest verbunden;b) the drive gear (4) is non-releasably connected with a non-positive connection to the gear hub (7); c) durch Antrieb der Antriebswelle (3) in Pfeilrichtung um den ortsfesten Mittelpunkt (5) stellt ein entstandenes Drehmoment mittels eines Rollenfreilaufs (6) schlagartig die kraftschlüssige Verbindung zwischen Antriebswelle (3) und Zahnradnabe (7) her, wobei sich Rollen des Rollenfreilaufs (6) über den gesamten Umfang an der glatten Oberfläche der Antriebswelle (3) verklammem, aber bei Stillstand der Antriebswelle (3) wieder lösen;c) by driving the drive shaft (3) in the direction of the arrow around the fixed center point (5), a torque created by means of a roller freewheel (6) suddenly creates the non-positive connection between the drive shaft (3) and the gear hub (7), with rollers of the roller freewheel ( 6) Clamp over the entire circumference on the smooth surface of the drive shaft (3), but release it again when the drive shaft (3) is at a standstill; d) über den ständigen Zahneingriff (9) wird das einen Zahn mehr aufweisende elastisches Hohlrad (8) gleitend entlang des innwandigen Halbkreises (10) innerhalb des Gehäuses (1) in eine relative Drehbewegung zum antreibenden Antriebszahnrad (4) versetzt;d) via the permanent tooth engagement (9), the one tooth more elastic ring gear (8) is slidably set along the inner semicircle (10) within the housing (1) in a relative rotational movement to the driving drive gear (4); e) das Antriebszahnrad (4) hat zum Hohlrad (8) eine Zähnezahldifferenz von 1, wobei die halbkreisförmige Zahngeometrie des Antriebszahnrades (4) positiv und die des Hohlrades (8) als negative Form ausgebildet ist; f) das zylinderfbrmige Gehäuse (1) hat einen kreisförmigen geringfügig, als Langloch ausgebildeten Gehäuseinnenraum bei dem die innere Wandung zwischen den Mittelachsen (17) und (18) als kurze Gerade ausgebildet ist;e) the drive gear (4) to the ring gear (8) has a difference in the number of teeth of 1, the semicircular tooth geometry of the drive gear (4) being positive and that of the ring gear (8) being a negative shape; f) the cylindrical housing (1) has a circular, slightly, as an elongated hole housing interior in which the inner wall between the central axes (17) and (18) is designed as a short straight line; g) bei betriebsbedingter Materialerwärmung werden radiale Wärmedehnungen vom elastischen Hohlrad (8) bzw. Antriebszahnrad (4) in den vorhandenen Freiraum (16) verlagert und kompensiert;g) in the event of operational material heating, radial thermal expansions from the elastic ring gear (8) or drive gear (4) are displaced and compensated for in the available space (16); h) eine axiale Längendehnung bei Erwärmung der Antriebswelle (3) wird bei Verwendung des Rollenfreilaufs (6) durch diesen die axiale Verschiebemöglichkeit des Antriebszahnrades (4) auf der glatten Antriebswelle (3) zur Kompensation der Längenausdehnung genutzt;h) an axial longitudinal expansion when the drive shaft (3) heats up, when the roller freewheel (6) is used, the axial displacement possibility of the drive gear (4) on the smooth drive shaft (3) is used to compensate for the linear expansion; i) die Relativbewegung zwischen Antriebszahnrad (4) und Hohlrad (8) bildet Hohlräume (11), welche ihre Volumen saugseitig von Null bis zur größten Ausdehnung erweitem und druckseitig das Volumen bis auf Null wieder reduzieren;i) the relative movement between the drive gear (4) and the ring gear (8) forms cavities (11) which expand their volume on the suction side from zero to the greatest extent and on the pressure side reduce the volume to zero again; j) die saugseitige Vergrößerung der Hohlräume (11) bewirkt, daß die zu fördernde Flüssigkeit durch den Pumpeneingang (12) über den Überströmkanal (13) in das Pumpeninnere angesaugt wird;j) the suction-side enlargement of the cavities (11) causes the liquid to be pumped to be sucked into the pump interior through the pump inlet (12) via the overflow channel (13); k) die druckseitige Verkleinerung der Hohlräume (1 1) bewirkt, daß die zu fördernde Flüssigkeit über den druckseitigen Überströmkanal (14) durch den Pumpenausgang (15) wieder verdrängt wird.k) the pressure-side reduction of the cavities (1 1) has the effect that the liquid to be pumped is displaced again via the pressure-side overflow channel (14) through the pump outlet (15). 3. Selbstzentrierende Zahnradpumpe nach Anspruch 1 oder Anspmch 2, dadurch gekennzeichnet, dass die rotierenden Verzahnungsteile Antriebszahnrad (4) und Hohlrad (8) die werkstoffmäßig gleichen Ausdehnungskoeffizienten wie das Gehäuse (1) haben. 3. Self-centering gear pump according to claim 1 or Anspmch 2, characterized in that the rotating toothed parts drive gear (4) and ring gear (8) have the same material expansion coefficient as the housing (1).
PCT/EP2002/002253 2001-03-22 2002-03-01 Self-centering gear pump Ceased WO2002077458A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/472,456 US20040136856A1 (en) 2001-03-22 2002-03-01 Self-centering gear pump
EP02724189A EP1370771A1 (en) 2001-03-22 2002-03-01 Self-centering gear pump
CA002441596A CA2441596A1 (en) 2001-03-22 2002-03-01 Self-centering gear pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10114148A DE10114148C1 (en) 2001-03-22 2001-03-22 Self-centering gearwheel pump, especially for flowable pastes and fluids, includes driving gearwheel axially fitted non-positively on smooth drive shaft and with eccentric hollow wheel to compensate radial heat expansions
DE10114148.3 2001-03-22

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WO2002077458A1 true WO2002077458A1 (en) 2002-10-03

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US (1) US20040136856A1 (en)
EP (1) EP1370771A1 (en)
CA (1) CA2441596A1 (en)
DE (1) DE10114148C1 (en)
WO (1) WO2002077458A1 (en)

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CN108916628B (en) * 2018-07-10 2019-12-31 浙江平柴泵业有限公司 Efficient oil pump

Citations (4)

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US3958494A (en) * 1974-09-30 1976-05-25 Moog Inc. Multiple displacement hydraulic motor drive apparatus
US6074189A (en) * 1996-12-12 2000-06-13 Eckerle; Otto Filling member-less internal-gear machine
DE29810548U1 (en) * 1998-06-16 1998-12-17 Joma-Polytec GmbH, 72411 Bodelshausen Gear for a gear pump

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US20040136856A1 (en) 2004-07-15
CA2441596A1 (en) 2002-10-03
DE10114148C1 (en) 2002-06-06
EP1370771A1 (en) 2003-12-17

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