EP0845596B1 - Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads - Google Patents

Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads Download PDF

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Publication number
EP0845596B1
EP0845596B1 EP97119840A EP97119840A EP0845596B1 EP 0845596 B1 EP0845596 B1 EP 0845596B1 EP 97119840 A EP97119840 A EP 97119840A EP 97119840 A EP97119840 A EP 97119840A EP 0845596 B1 EP0845596 B1 EP 0845596B1
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EP
European Patent Office
Prior art keywords
internal gear
sealing element
pinion
empty
spring
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
EP97119840A
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German (de)
French (fr)
Other versions
EP0845596A1 (en
Inventor
Franz Arbogast
Peter Peiz
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.)
Voith Turbo GmbH and Co KG
Original Assignee
Voith Turbo GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Turbo GmbH and Co KG filed Critical Voith Turbo GmbH and Co KG
Publication of EP0845596A1 publication Critical patent/EP0845596A1/en
Application granted granted Critical
Publication of EP0845596B1 publication Critical patent/EP0845596B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0007—Radial sealings for working fluid
    • F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the present invention relates to a sickle-free internal gear pump for Generation of high pressure according to the preamble of patent claims 1 or 2nd
  • a pump of this generic type is special Embodiment known from DE 41 40 293 C2 (EP 0 545 424 A1).
  • Internal gear pumps generally have an internal gear with which an externally toothed pinion meshes with fewer teeth, i.e. is drivingly engaged.
  • the gearing is such Pumps - based on the diameter of the pinion or the ring gear - relatively narrow, so that after the volume flow to be conveyed through the The height of the teeth and the width of the toothing is determined by this Volume flow for common pumps for design reasons is limited.
  • Sickle-free internal gear pumps have the particular advantage of a minimal construction volume.
  • the present invention is based on the problem, a sickle-free internal gear pump of the generic type to specify at the aforementioned problem does not exist a priori.
  • the essence of the present invention is that To configure the sealing element so that it integrates the spring element Part includes or is designed so that it has a resilient part.
  • Fig. 1 shows in a cross section a sickle-free, head-sealing backlash, each with a flank sealing internal gear pump, and in the area of a housing part 1, which - viewed in the axial direction - Connect further housing parts.
  • a fixed on a drive shaft 4 externally toothed pinion 5 is in engagement with an internally toothed pinion Ring gear 6 and thus forms a toothing 12.
  • the pinion 5 and the ring gear 6 are not coaxial, but eccentric to each other; furthermore that Pinion 5 one tooth less than the ring gear 6, so that each Outside of a tooth head 13 on the pinion 5 with the inside of a Toothed head 14 comes into contact with the ring gear 6.
  • Suction port 7 in the zone where the rotation in the direction of arrow X Teeth on pinion 5 or ring gear 6 are out of engagement.
  • a pressure connection 10 is located also starting from a ring gear 6 over a circumferential area extending pressure pocket 11, on the opposite side of the pump. The inflow from the pressure medium to the interior of the pump, i.e. to the Tooth gaps in the pinion 5 and the ring gear 6, which promote the Cause pressure medium takes place via - compare Fig. 2 - radial Breakthroughs 17 in the ring gear 6. These breakthroughs 17 go from Shell surface 20 of the ring gear 6 and open into the tooth base.
  • each sealing elements 30 used, according to the present invention are specially designed. These sealing elements 30 according to the invention are shown in Figures 2a / b and 3 enlarged.
  • Fig. 2a shows a section of the (pinion 5 / ring gear 6-) teeth 12 in Area of three tooth heads 13 / 14. Over the circumference of the ring gear 6 are considered for the inflow of the pressure medium to the interior of the Internal gear pump provided openings 17 incorporated.
  • the sealing element 30 itself is - as is known per se - radially movable (compare arrow Y) in a complementary to the cross section of the Sealing element 30 formed profile groove 34 in the tooth head 14 of the ring gear 6 assembled or used. This allows a radially directed displacement Verify the sealing element 30 in the profile groove 34.
  • the said Radial displacement is limited on both sides, on the one hand by an the brim adjoining the end face 33; the second stop is by a positive stop 38 of the foot part 39 of the sealing element 30 realized on the conjugate side surface 40 of the profile groove 34. Between these the two stops, the sealing element 30 can thus move radially.
  • this has Sealing element 30 approximately the cross-sectional shape of a mushroom, the in Rotation direction X looks at the leading foot part conically in the direction Shell surface 20 of the ring gear 6 is widened.
  • the aforementioned fixed stop 38 results from the complementary edge formation of the profile groove 34.
  • the sealing element 30 is at the bottom of the Profile groove 34 via a molded or injected in the foot part of the sealing element 30 Spring 42 on. This ensures that the sealing element 30 on the one hand is always pressed against the side surfaces of the profile groove 34 and on the other hand is pressed sealingly against the tooth head 13 of the pinion 5 when the Toothed heads 13/14 of pinion 5 and ring gear 6 are opposite.
  • the sealing element 30 according to the invention is corresponding to FIG Section line A-B shown constructively.
  • This representation according to Fig. 2b shows the ring gear / pinion pairing, between the pinion 5 and the Ring gear 6 is a sealing element 30 which is at the bottom of the profile groove 34 of the Ring gear 6 abuts via a (so-called corrugated) spring.
  • This spring 42 will inserted into the injection mold during the injection process for the sealing element 30 and so immediately (quasi as a captive component) into the sealing element 30 injected. This thus includes the spring 42 as an integral part, so that only a part has to be assembled when installing the pump.
  • Fig. 3 shows the same section (pinion 5 / ring gear 6) toothing 12 as Fig. 2a.
  • the sealing element 30 itself is here trained or designed that the spring action or bias for the Positive / frictional engagement of the sealing element 30 in the profile groove 34 from itself the shape design results.
  • This is achieved according to the invention in that the sealing element 30 has an undercut 43 in the region of the foot part has, so that the sealing element 30 is not over the entire cross section or - compare illustration - only via a lip 44 at the bottom of the Profile groove 34 rests.

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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 sichellose Innenzahnradpumpe zur Erzeugung von Hochdruck nach dem Oberbegriff der Patentansprüche 1 bzw. 2.The present invention relates to a sickle-free internal gear pump for Generation of high pressure according to the preamble of patent claims 1 or 2nd

Eine Pumpe dieser gattungsgemäßen Bauart ist als besonderes Ausführungsbeispiel aus der DE 41 40 293 C2 (EP 0 545 424 A1) bekannt.A pump of this generic type is special Embodiment known from DE 41 40 293 C2 (EP 0 545 424 A1).

Innenzahnradpumpen weisen im allgemeinen ein innenverzahntes Hohlrad auf, mit dem ein außenverzahntes Ritzel mit geringerer Zähnezahl kämmt, d.h. treibend im Eingriff steht. In der Regel ist die Verzahnung derartiger Pumpen - bezogen auf den Durchmesser der Ritzel bzw. des Hohlrads - relativ schmal, so daß, nachdem der zu fördernde Volumenstrom durch die Höhe der Zähne und die Breite der Verzahnung bestimmt ist, dieser Volumenstrom bei den gängigen Pumpen aus konstruktiven Gründen begrenzt ist. Sichellose Innenzahnradpumpen haben insbesondere den Vorteil eines minimalen Bauvolumens.Internal gear pumps generally have an internal gear with which an externally toothed pinion meshes with fewer teeth, i.e. is drivingly engaged. As a rule, the gearing is such Pumps - based on the diameter of the pinion or the ring gear - relatively narrow, so that after the volume flow to be conveyed through the The height of the teeth and the width of the toothing is determined by this Volume flow for common pumps for design reasons is limited. Sickle-free internal gear pumps have the particular advantage of a minimal construction volume.

Zur Verbesserung der Dichtheit zwischen den Zahnköpfen von Ritzel und Hohlrad ist in der DE 41 40 293 C2 bereits vorgeschlagen worden, in jedem der Zahnköpfe des Hohlrads ein Dichtelement einzusetzen, das rückseitig, d.h. dem Grund der Profilnut gegenüber, über ein Federelement vorgespannt ist.To improve the tightness between the tooth tips of the pinion and Ring gear has already been proposed in DE 41 40 293 C2, in each of the toothed heads of the ring gear to insert a sealing element i.e. biased against the bottom of the profile groove, via a spring element is.

Bei der aus der DE 41 40 293 C2 bekannten sichellosen Innenzahnradpumpe ist das Federelement als separates Einzelteil montiert. Dies hat einerseits den Nachteil, daß eine gesonderte Lagerhaltung und Typenpflege erforderlich ist; anderereits besteht dabei auch die Gefahr, daß vergessen wird, das Federelement zu montieren, so daß das Dichtelement die bestimmungsgemäße Dichtfunktion nicht erfüllen kann.In the crescentless internal gear pump known from DE 41 40 293 C2 the spring element is mounted as a separate part. On the one hand, this has the Disadvantage that separate storage and type maintenance is required; on the other hand there is also the danger that it will be forgotten that Mount spring element so that the sealing element cannot perform its intended sealing function.

Der vorliegenden Erfindung liegt die Problemstellung zugrunde, eine sichellose Innenzahnradpumpe der gattungsgemäßen Art anzugeben, bei der die vorgenannte Problematik ä priori nicht vorhanden ist.The present invention is based on the problem, a sickle-free internal gear pump of the generic type to specify at the aforementioned problem does not exist a priori.

Diese Aufgabe wird durch die kennzeichnenden Merkmale der Ansprüche 1 bzw. 2 gelöst.This object is achieved by the characterizing features of claims 1 or 2 solved.

Mit anderen - als in den Patentansprüchen gebrauchten - Worten ausgedrückt, liegt der Kern der vorliegenden Erfindung letztlich darin, das Dichtelement so zu konfigurieren, daß es das Federelement als integrierten Teil umfaßt bzw. so gestaltet ist, daß es ein federndes Teil aufweist.In other words - than used in the claims in essence, the essence of the present invention is that To configure the sealing element so that it integrates the spring element Part includes or is designed so that it has a resilient part.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. Diese zeigt in

Fig. 1
einen Querschnitt durch eine sichellose Innenzahnradpumpe im Bereich der beiden Zahnräder;
Fig. 2 a/b
als Ausschnitt aus Fig. 1 und Querschnittsdarstellung entsprechend der Schnittlinie A-B ein erstes Ausführungsbeispiel eines Dichtelements, wobei dessen Vorspannung mittels einer eingespritzten Feder verifiziert wird;
Fig. 3
als Ausschnitt aus Fig. 1 ein zweites Ausführungsbeispiel eines Dichtelements, wobei dessen Vorspannung mittels einer im Fußteil eingearbeiteten Hinterschneidung verifiziert wird.
The invention is explained below with reference to the drawing. This shows in
Fig. 1
a cross section through a sickle-free internal gear pump in the region of the two gears;
Fig. 2a / b
as a detail from FIG. 1 and a cross-sectional illustration corresponding to the section line AB, a first exemplary embodiment of a sealing element, the pretension of which is verified by means of an injected spring;
Fig. 3
1 shows a second exemplary embodiment of a sealing element, the pretensioning of which is verified by means of an undercut incorporated in the foot part.

Die Fig. 1 zeigt in einem Querschnitt eine sichellose, kopfdichtende und spielbehaftete, jeweils mit einer Flanke dichtenden Innenzahnradpumpe, und zwar im Bereich eines Gehäuseteils 1, dem sich - in Axialrichtung betrachtet - weitere Gehäuseteile anschließen. Ein auf einer Antriebswelle 4 befestigtes außenverzahntes Ritzel 5 steht im Eingriff mit einem innenverzahnten Hohlrad 6 und bildet so eine Verzahnung 12. Das Ritzel 5 und das Hohlrad 6 sind nicht koaxial, sondern exzentrisch zueinander gelagert; ferner weist das Ritzel 5 einen Zahn weniger auf als das Hohlrad 6, so daß jeweils die Außenseite eines Zahnkopfes 13 am Ritzel 5 mit der Innenseite eines Zahnkopfes 14 am Hohlrad 6 in Berührung kommt. Zu erkennen ist ferner ein Sauganschluß 7 in der Zone, bei der unter Drehung in Pfeilrichtung X die Zähne am Ritzel 5 bzw. Hohlrad 6 außer Eingriff geraten. Dem Sauganschluß 7 im Gehäuseteil 1, in dem das Hohlrad 6 und das Ritzel 5 gelagert sind, schließt sich in axialer Richtung jeweils zu den benachbarten Gehäuseteilen eine Saugtasche 8 an, die sich über einen Teil der Mantelfläche 20 des Hohlrads 6 erstreckt. Ein Druckanschluß 10 befindet sich, ebenfalls ausgehend von einer sich über einen Umfangsbereich am Hohlrad 6 erstreckenden Drucktasche 11, auf der gegenüberliegenden Seite der Pumpe. Die Zuströmung vom Druckmedium zum Innenraum der Pumpe, also zu den Zahnlücken im Ritzel 5 und im Hohlrad 6, welche die Förderung des Druckmediums bewirken, erfolgt über - vergleiche Fig. 2 - radiale Durchbrüche 17 im Hohlrad 6. Diese Durchbrüche 17 gehen von der Mantelfläche 20 des Hohlrads 6 aus und münden in dessen Zahngrund.Fig. 1 shows in a cross section a sickle-free, head-sealing backlash, each with a flank sealing internal gear pump, and in the area of a housing part 1, which - viewed in the axial direction - Connect further housing parts. A fixed on a drive shaft 4 externally toothed pinion 5 is in engagement with an internally toothed pinion Ring gear 6 and thus forms a toothing 12. The pinion 5 and the ring gear 6 are not coaxial, but eccentric to each other; furthermore that Pinion 5 one tooth less than the ring gear 6, so that each Outside of a tooth head 13 on the pinion 5 with the inside of a Toothed head 14 comes into contact with the ring gear 6. One can also see a Suction port 7 in the zone where the rotation in the direction of arrow X Teeth on pinion 5 or ring gear 6 are out of engagement. the Suction port 7 in the housing part 1, in which the ring gear 6 and the pinion 5th are stored, closes in the axial direction to the neighboring ones Housing parts a suction bag 8, which extends over part of the Shell surface 20 of the ring gear 6 extends. A pressure connection 10 is located also starting from a ring gear 6 over a circumferential area extending pressure pocket 11, on the opposite side of the pump. The inflow from the pressure medium to the interior of the pump, i.e. to the Tooth gaps in the pinion 5 and the ring gear 6, which promote the Cause pressure medium takes place via - compare Fig. 2 - radial Breakthroughs 17 in the ring gear 6. These breakthroughs 17 go from Shell surface 20 of the ring gear 6 and open into the tooth base.

Gemäß der Darstellung nach Fig. 1 sind an den Zahnköpfen des Hohlrads 6 jeweils Dichtelemente 30 eingesetzt, die gemäß der vorliegenden Erfindung besonders ausgestaltet sind. Diese erfindungsgemäßen Dichtelemente 30 sind in den Figuren 2a/b und 3 vergrößert dargestellt.1 are on the tooth tips of the ring gear 6th each sealing elements 30 used, according to the present invention are specially designed. These sealing elements 30 according to the invention are shown in Figures 2a / b and 3 enlarged.

Fig. 2a zeigt einen Ausschnitt der (Ritzel 5/Hohlrad 6-) Verzahnung 12 im Bereich dreier Zahnköpfe 13 / 14. Über den Umfang des Hohlrads 6 betrachtet sind die zur Zuströmung des Druckmediums zum Innenraum der Innenzahnradpumpe vorgesehenen Durchbrüche 17 eingearbeitet.Fig. 2a shows a section of the (pinion 5 / ring gear 6-) teeth 12 in Area of three tooth heads 13 / 14. Over the circumference of the ring gear 6 are considered for the inflow of the pressure medium to the interior of the Internal gear pump provided openings 17 incorporated.

Das Dichtelement 30 selbst ist - wie an sich bekannt - radial beweglich (vergleiche Pfeil Y) in einer komplementär zum Querschnitt des Dichtelements 30 ausgebildeten Profilnut 34 im Zahnkopf 14 des Hohlrads 6 montiert bzw. eingesetzt. Damit läßt sich eine radial gerichtete Verschiebung des Dichtelements 30 in der Profilnut 34 verifizieren. Die genannte Radialverschiebung ist beidseitig begrenzt, und zwar einerseits durch eine an die Stirnfläche 33 angrenzende Krempe; der zweite Anschlag wird durch einen formschlüssigen Festanschlag 38 des Fußteils 39 des Dichtelements 30 an der konjugierten Seitenfläche 40 der Profilnut 34 realisiert. Zwischen diesen beiden Anschlägen kann sich somit das Dichtelement 30 radial bewegen.The sealing element 30 itself is - as is known per se - radially movable (compare arrow Y) in a complementary to the cross section of the Sealing element 30 formed profile groove 34 in the tooth head 14 of the ring gear 6 assembled or used. This allows a radially directed displacement Verify the sealing element 30 in the profile groove 34. The said Radial displacement is limited on both sides, on the one hand by an the brim adjoining the end face 33; the second stop is by a positive stop 38 of the foot part 39 of the sealing element 30 realized on the conjugate side surface 40 of the profile groove 34. Between these the two stops, the sealing element 30 can thus move radially.

Wie der zeichnerischen Darstellung nach Fig. 2a zu entnehmen ist, hat das Dichtelement 30 etwa die Querschnittsform eines Pilzes, wobei das in Umlaufrichtung X betrachtet voreilende Fußteil konisch in Richtung Mantelfläche 20 des Hohlrads 6 verbreitert ist. Der genannte Festanschlag 38 ergibt sich so über die komplementäre Randausbildung der Profilnut 34.As can be seen from the graphic representation according to FIG. 2a, this has Sealing element 30 approximately the cross-sectional shape of a mushroom, the in Rotation direction X looks at the leading foot part conically in the direction Shell surface 20 of the ring gear 6 is widened. The aforementioned fixed stop 38 results from the complementary edge formation of the profile groove 34.

Zwischen dem Fuß des Dichtelements 30 und dem Grund der Profilnut 34 liegt ein Freiraum 41. Das Dichtelement 30 steht dabei am Grund der Profilnut 34 über eine im Fußteil des Dichtelements 30 ein- bzw. angespritzte Feder 42 auf. Dadaurch ist sichergestellt, daß das Dichtelement 30 einerseits stets gegen die Seitenflächen der Profilnut 34 gepreßt ist und andererseits dichtend gegen den Zahnkopf 13 des Ritzels 5 gepreßt wird, wenn sich die Zahnköpfe 13 / 14 von Ritzel 5 und Hohlrad 6 gegenüberliegen.Between the foot of the sealing element 30 and the base of the profile groove 34 there is a free space 41. The sealing element 30 is at the bottom of the Profile groove 34 via a molded or injected in the foot part of the sealing element 30 Spring 42 on. This ensures that the sealing element 30 on the one hand is always pressed against the side surfaces of the profile groove 34 and on the other hand is pressed sealingly against the tooth head 13 of the pinion 5 when the Toothed heads 13/14 of pinion 5 and ring gear 6 are opposite.

In Fig. 2b ist das erfindungsgemäße Dichtelement 30 entsprechend der Schnittlinie A-B konstruktiv dargestellt. Diese Darstellung nach Fig. 2b zeigt die Hohlrad- / Ritzelpaarung, wobei zwischen dem Ritzel 5 und dem Hohlrad 6 ein Dichtelement 30 liegt, das am Grund der Profilnut 34 des Hohlrads 6 über eine (sogenannte Well-) Feder anliegt. Diese Feder 42 wird beim Spritzvorgang für das Dichtelement 30 in die Spritzform eingelegt und so unmittelbar (quasi als unverlierbarer Bestandteil) in das Dichtelement 30 eingespritzt. Dieses umfaßt so als integralen Bestandteil die Feder 42, so daß bei der Montage der Pumpe nur ein Teil zu montieren ist.2b, the sealing element 30 according to the invention is corresponding to FIG Section line A-B shown constructively. This representation according to Fig. 2b shows the ring gear / pinion pairing, between the pinion 5 and the Ring gear 6 is a sealing element 30 which is at the bottom of the profile groove 34 of the Ring gear 6 abuts via a (so-called corrugated) spring. This spring 42 will inserted into the injection mold during the injection process for the sealing element 30 and so immediately (quasi as a captive component) into the sealing element 30 injected. This thus includes the spring 42 as an integral part, so that only a part has to be assembled when installing the pump.

Fig. 3 zeigt den gleichen Ausschnitt (Ritzel 5/Hohlrad 6) Verzahnung 12 wie Fig. 2a. Im Unterschied zu Fig. 2a ist hier das Dichtelement 30 selbst so ausgebildet bzw. gestaltet, daß die Federwirkung bzw. Vorspannung für den Form- /Kraftschluß des Dichtelements 30 in der Profilnut 34 sich alleine aus der Formgestaltung ergibt. Erreicht wird dies erfindungsgemäß dadurch, daß das Dichtelement 30 im Bereich des Fußteils eine Hinterschneidung 43 aufweist, so daß das Dichtelement 30 nicht über den gesamten Querschnitt bzw. - vergleiche Darstellung - nur über eine Lippe 44 am Grund der Profilnut 34 aufliegt.Fig. 3 shows the same section (pinion 5 / ring gear 6) toothing 12 as Fig. 2a. In contrast to Fig. 2a, the sealing element 30 itself is here trained or designed that the spring action or bias for the Positive / frictional engagement of the sealing element 30 in the profile groove 34 from itself the shape design results. This is achieved according to the invention in that the sealing element 30 has an undercut 43 in the region of the foot part has, so that the sealing element 30 is not over the entire cross section or - compare illustration - only via a lip 44 at the bottom of the Profile groove 34 rests.

Claims (2)

  1. Internal gear pump with empty crescent space comprising teeth (12) sealing substantially with a flank and comprising an internally toothed gear (6) and a pinion (5) meshing with the internal gear (6) which are rotatably mounted in a commonly mounted housing part (1), the axial extension of which corresponds to the width of the gearing (12) of the internal gear (6) and of the pinion (5) and comprises a suction connection (7) and a pressure connection (10), the internal gear (6) comprising radial openings (17) for the medium to be pumped, a respective sealing element (30) radially movable in a correspondingly designed, in particular dovetailed, profiled groove (34) and spring-biased with respect to the profiled groove (34) is inserted into the tooth tips (14) of the internal gear (6), the sealing element (30) being able to slide on the opposing tooth tip of the pinion (5), characterised in that the sealing element (30) is biased by means of a spring (42) injected at the base part.
  2. Internal gear pump with empty crescent space comprising teeth (12) sealing substantially with a flank and comprising an internally tothed gear (6) and a pinion (5) meshing with the internal gear (6) which are rotatably mounted in a commonly mounted housing part (1), the axial extension of which corresponds to the width of the gearing (12) of the internal gear (6) and of the pinion (5) and comprises a suction connection (7) and a pressure connection (10), the internal gear (6) comprising radial openings (17) for the medium to be pumped, a respective sealing element (30) radially movable in a correspondingly designed, in particular dovetailed, profiled groove (34) and spring-biased with respect to the profiled groove (34) is inserted into the tooth tips (14) of the internal gear (6), the sealing element (30) being able to slide on the opposing tooth tip of the pinion (5), characterised in that the sealing element (30) is biased by an undercut (43) provided at the base of the profiled groove (34) opposing the base part.
EP97119840A 1996-11-27 1997-11-13 Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads Expired - Lifetime EP0845596B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19649180 1996-11-27
DE19649180A DE19649180A1 (en) 1996-11-27 1996-11-27 Sickle-free internal gear pump with sealing elements spring-loaded into the tooth heads

Publications (2)

Publication Number Publication Date
EP0845596A1 EP0845596A1 (en) 1998-06-03
EP0845596B1 true EP0845596B1 (en) 2002-08-28

Family

ID=7812946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97119840A Expired - Lifetime EP0845596B1 (en) 1996-11-27 1997-11-13 Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads

Country Status (6)

Country Link
EP (1) EP0845596B1 (en)
JP (1) JPH10159752A (en)
DE (2) DE19649180A1 (en)
DK (1) DK0845596T3 (en)
ES (1) ES2179255T3 (en)
TW (1) TW474370U (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140314608A1 (en) * 2011-11-10 2014-10-23 Toyota Jidosha Kabushiki Kaisha Internal-gear-type oil pump for vehicle
CN104895781A (en) * 2014-09-17 2015-09-09 襄阳博亚精工装备股份有限公司 Internal gear pump

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1293169A (en) * 1961-03-31 1962-05-11 Renault Split segments
DE1189788B (en) * 1962-07-24 1965-03-25 Daimler Benz Ag Radial seal for rotary piston internal combustion engines
US3277833A (en) * 1964-03-16 1966-10-11 Trw Inc Hydraulic device
DE2221131A1 (en) * 1972-04-28 1973-11-08 Arno Fischer ROTATING PISTON MACHINE
US3972660A (en) * 1975-11-12 1976-08-03 Caterpillar Tractor Co. Corner seals for rotary mechanisms
US5203307A (en) * 1989-06-29 1993-04-20 Burtis Wilson A Rotary wankel type engine
DE4140293C2 (en) * 1991-12-06 1994-06-01 Voith Gmbh J M Sickle-free internal gear pump with sealing elements inserted in the tooth heads

Also Published As

Publication number Publication date
EP0845596A1 (en) 1998-06-03
DE19649180A1 (en) 1998-05-28
DE59708057D1 (en) 2002-10-02
ES2179255T3 (en) 2003-01-16
JPH10159752A (en) 1998-06-16
DK0845596T3 (en) 2002-12-23
TW474370U (en) 2002-01-21

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