EP0545424A1 - Internal gear pump with sealings incorporated in the teeth - Google Patents

Internal gear pump with sealings incorporated in the teeth Download PDF

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Publication number
EP0545424A1
EP0545424A1 EP92120694A EP92120694A EP0545424A1 EP 0545424 A1 EP0545424 A1 EP 0545424A1 EP 92120694 A EP92120694 A EP 92120694A EP 92120694 A EP92120694 A EP 92120694A EP 0545424 A1 EP0545424 A1 EP 0545424A1
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EP
European Patent Office
Prior art keywords
ring gear
pinion
sealing element
internal gear
tooth
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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.)
Granted
Application number
EP92120694A
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German (de)
French (fr)
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EP0545424B1 (en
Inventor
Peter Peiz
Franz Arbogast
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JM Voith GmbH
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JM Voith GmbH
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Publication of EP0545424A1 publication Critical patent/EP0545424A1/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
    • 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
    • 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
    • F04C2/084—Toothed wheels
    • 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

Definitions

  • the present invention relates to a sickle-free internal gear pump for generating high pressure according to the preamble of claim 1.
  • a pump of this generic type is known as a special embodiment from DE 41 04 397 A1.
  • Internal gear pumps generally have an internally toothed ring gear with which an externally toothed pinion meshes with a smaller number of teeth, i.e. is drivingly engaged.
  • the teeth of such pumps - based on the diameter of the pinion or the ring gear - are relatively narrow, so that - after the volume flow to be pumped is determined by the height of the teeth and the width of the teeth, this volume flow in the common pumps is limited for design reasons.
  • Sickle-free internal gear pumps have the particular advantage of a minimal construction volume.
  • DE 41 04 397 A1 has already proposed to use a sealing element in each of the tooth tips of one of the two gear wheels. These sealing elements are connected to the back of the pressure area, so that when they mesh the gears they seal against the tooth tip of the other gear.
  • the present invention is based on the problem of specifying a sickle-free internal gear pump of the generic type, with which the sealing effect when pressure builds up between the opposing tooth tips of the gear wheels is improved without the manufacturing effort increasing disproportionately and with the result that the aforementioned inadequacies (pressure pulsation, Noise) are eliminated.
  • sealing element in the area of the sliding surface is dimensioned such that it takes up the entire head surface of the ring gear or pinion tooth head.
  • the essence of the present invention is ultimately to replace the tooth tips of the ring gear or the pinion quasi by an equivalent, ie equivalent use, due to its specific Design or shape in the area of the pressure build-up realizes a surface seal and thus ensures a minimal gap between the pinion head and the ring gear head. This also improves the volumetric efficiency, which ultimately has the consequence that the internal gear pump is suitable for higher pressures. At the same time, the extreme efforts required to minimize the gap when manufacturing or assembling an internal gear pump are eliminated; For example, there is no need to jointly spindle out the slide bearings of the bearing caps of an internal gear pump. With regard to the production of ring gears, it should be noted that the elaborate and complicated profile grinding of the hollow head shape can be omitted, because this is verified by a separate, and therefore more cost-effective, use.
  • a particular advantage of the concept according to the invention is that a sensible pressure build-up control via control slots is possible via the radial compensation achieved.
  • FIG. 1 shows in a cross section a sickle-free, head-sealing and play-afflicted internal gear pump, each with a flank sealing, in the region of a housing middle part 1, which - viewed in the axial direction - Connect further housing parts.
  • the entire pump with the three housing parts has an overall axial length L.
  • An externally toothed pinion 5 fastened to a drive shaft 4 is in engagement with an internally toothed ring gear 6.
  • the toothing 12 of the pinion 5 and the ring gear 6 have an axial width B, the pinion one Pitch circle diameter dO; the width of the toothing is larger than the pitch circle diameter dO.
  • the pinion 5 and the ring gear 6 are not mounted coaxially, but eccentrically to one another; furthermore, the pinion 5 has one tooth less than the ring gear 6, so that in each case the outside of a tooth head 13 on the pinion 5 comes into contact with the inside of a tooth head 14 on the ring gear 6.
  • a suction connection 7 can also be seen in the zone in which the teeth on the pinion 5 or ring gear 6 disengage when rotated in the direction of the arrow X.
  • the suction connection 7 in the middle part 1 of the housing, in which the ring gear 6 and the pinion 5 are mounted, is adjoined in the axial direction to the adjacent housing parts by a suction pocket 8, which extends over part of the outer surface 20 of the ring gear 6.
  • a pressure connection 10 is located, likewise starting from a pressure pocket 11 extending over a circumferential area on the ring gear, on the opposite side of the pump.
  • sealing elements 30 are now used in a manner known per se on the tooth heads of the ring gear 6, which are specially designed and mounted or held according to the present invention. These sealing elements 30 according to the invention are shown enlarged in FIG. 2.
  • FIG. 2 shows a section of the ring gear 6 in the region of a tooth head 14.
  • the openings 17 provided for the inflow of the pressure medium to the interior of the internal gear pump are incorporated.
  • the sealing elements 30 are each used in the transition area between an opening 17 and a tooth head 14 in such a way that an overlap area (undercut) 32 is formed towards the opening 17.
  • the outer end face 33 of the sealing element 30, that is to say on the head side, is designed such that when the sealing element 30 is arranged symmetrically relative to a tooth head 14, its nominal head shape, i.e. whose geometric ideal shape corresponds exactly.
  • the sealing element 30 itself is - as is known at the view - radially movable (see arrow Y) in a complementary to the cross section of the sealing element 30 formed profile groove 34 mounted or inserted in the tooth head 14.
  • a radially directed displacement of the sealing element 30 in the profile groove 34 can thus be verified.
  • Said radial displacement is limited on both sides, on the one hand by a brim adjoining the rounded or profiled end face 33 with a conjugated stop face 37 of the sealing element 30 which abuts a complementary stop face 36 of the tooth head 14; the second stop is a positive one Fixed stop 38 of the foot part 39 of the sealing element 30 realized on the conjugated side surface 40 of the profile groove 34. Between these two stops, the sealing element 30 can thus be moved radially to the extent of the gap width Z.
  • the sealing element 30 has approximately the cross-sectional shape of a mushroom, the foot part lagging in the direction of rotation X of the ring gear 6 being widened conically in the direction of the lateral surface 20. Said fixed stop 38 thus results from the complementary wall formation of the profile groove 34.
  • a free space 41 which is open to the pressure chamber of the pump via the undercut 32 or the cut of the opening 17.
  • a spring element in particular a wave spring 42, is located opposite the foot of the sealing element 30.
  • the material of the sealing element 30 must have good running-in properties, so that only non-ferrous metal or fiber-reinforced plastic can be used as the material.
  • sealing element 30 according to the invention was only disclosed in connection with a ring gear 6 in the foregoing with reference to FIG. 2, sealing elements which meet the specified conditions can equally be installed in the pinion 5.

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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 crescent-less internal-gear pump having a ring gear (6) and a pinion (5) meshing with the ring gear (6) which are rotatably supported in a jointly supported casing section (1) whose axial extent corresponds to the width of the gearing (12) of the ring gear (6) and the pinion (5) and which has a suction connection (7) and a discharge connection (10), the ring gear (6) having radial openings (17) for the medium to be pumped, and there being set, in the tooth tips (14) of the ring gear (6) and in the tooth tips (13) of the pinion (5), one sealing element (30) in each case which is radially movable in an appropriately shaped profiled groove (34) and which can slide on the opposite tooth tip of the pinion (5) and of the ring gear (6). The invention is characterised in that the sealing element is dimensioned in such a way in the region of the sliding surface that it occupies the entire tip face of the tooth tip of the ring gear and of the pinion. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine sichellose Innenzahnradpumpe zur Erzeugung von Hochdruck nach dem Oberbegriff des Patentanspruchs 1. Eine Pumpe dieser gattungsgemäßen Bauart ist als besonderes Ausführungsbeispiel aus der DE 41 04 397 A1 bekannt.The present invention relates to a sickle-free internal gear pump for generating high pressure according to the preamble of claim 1. A pump of this generic type is known as a special embodiment from DE 41 04 397 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 Hohlrades - 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 mimimalen Bauvolumens.Internal gear pumps generally have an internally toothed ring gear with which an externally toothed pinion meshes with a smaller number of teeth, i.e. is drivingly engaged. As a rule, the teeth of such pumps - based on the diameter of the pinion or the ring gear - are relatively narrow, so that - after the volume flow to be pumped is determined by the height of the teeth and the width of the teeth, this volume flow in the common pumps is limited for design reasons. 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 04 397 A1 bereits vorgeschlagen worden, in jedem der Zahnköpfe eines der beiden Zahnräder ein Dichtelement einzusetzen. Diese Dichtelemente stehen rückseitig mit dem Druckbereich in Verbindung, so daß sie sich beim Kämmen der Zahnräder dichtend gegen den Zahnkopf des jeweils anderen Zahnrads anlegen.In order to improve the tightness between the tooth tips of the pinion and ring gear, DE 41 04 397 A1 has already proposed to use a sealing element in each of the tooth tips of one of the two gear wheels. These sealing elements are connected to the back of the pressure area, so that when they mesh the gears they seal against the tooth tip of the other gear.

Bei der aus der DE 41 04 397 A1 bekannten sichellosen Innenzahnradpumpe entsteht jedoch im Bereich des Druckaufbaus an den Zahnköpfen der geometrischen Form der Dichtelemente entsprechend nur eine Liniendichtung. Dies hat bei ungünstigen Verhältnissen aufgrund von Toleranzabweichungen, von Abstandsveränderungen oder von Änderungen der Kopfkreisdurchmesser ggf. zur Folge, daß die Dichtheit der Innenzahnradpumpe mangelhaft ist. Dies bedeutet einen Verlust an Pumpmedium, einen Abfall des volumetrischen Wirkungsgrades, eine Zunahme der Druckpulsation und schließlich eine Zunahme des Geräuschpegels der Pumpe beim Betrieb. Die für eine Abhilfe erforderlichen günstigeren Spaltverhältnisse im Bereich der Zahnkopf-Dichtung beim Druckaufbau ließe sich nur mit einem extrem hohen Fertigungsaufwand realisieren.In the case of the crescent-free internal gear pump known from DE 41 04 397 A1, however, only a line seal is produced in the area of the pressure build-up on the tooth tips according to the geometric shape of the sealing elements. In unfavorable conditions due to tolerance deviations, changes in distance or changes in the tip diameter, this may result in the tightness of the internal gear pump being poor. This means a loss of pumping medium, a decrease in volumetric efficiency, an increase in pressure pulsation and finally an increase in the noise level of the pump during operation. The more favorable gap conditions required for a remedy in the area of the tooth tip seal during pressure build-up could only be realized with an extremely high manufacturing effort.

Der vorliegenden Erfindung liegt die Problemstellung zugrunde, eine sichellose Innenzahnradpumpe der gattungsgemäßen Art anzugeben, mit der die Dichtwirkung beim Druckaufbau zwischen den sich gegenüberliegenden Zahnköpfen der Zahnräder verbessert wird, ohne daß der Fertigungsaufwand überproportional ansteigt und mit der Folge, daß die vorgenannten Unzulänglichkeiten (Druckpulsation, Geräusch) eliminiert sind.The present invention is based on the problem of specifying a sickle-free internal gear pump of the generic type, with which the sealing effect when pressure builds up between the opposing tooth tips of the gear wheels is improved without the manufacturing effort increasing disproportionately and with the result that the aforementioned inadequacies (pressure pulsation, Noise) are eliminated.

Diese Aufgabe wird dadurch gelöst, daß das Dichtelement im Bereich der Gleitfläche so dimensioniert ist, daß es die gesamte Kopffläche des Hohlrad- bzw. Ritzel-Zahnkopfes einnimmt.This object is achieved in that the sealing element in the area of the sliding surface is dimensioned such that it takes up the entire head surface of the ring gear or pinion tooth head.

Mit anderen - als im Patentanspruch 1 gebrauchten - Worten ausgedrückt, liegt der Kern der vorliegenden Erfindung letztlich darin, die Zahnköpfe des Hohlrades oder des Ritzels quasi durch einen äquivalenten, d.h. gleichwirkenden Einsatz zu ersetzen, der aufgrund seiner spezifischen Ausgestaltung bzw. Formgebung im Bereich des Druckaufbaus eine Flächendichtung realisiert und so für einen minimalen Spalt zwischen Ritzelkopf und Hohlradkopf sorgt. Damit wird auch der volumetrische Wirkungsgrad verbessert, was schließlich zur Folge hat, daß die Innenzahnradpumpe für höhere Drücke geeignet ist. Gleichermaßen entfallen die bei der Fertigung bzw. Montage einer Innenzahnradpumpe erforderlichen extremen Anstrengungen zur Spaltminimierung; beispielsweise entfällt das gemeinsame Ausspindeln der Gleitlager der Lagerdeckel einer Innenzahnradpumpe. Im Hinblick auf die Fertigung von Hohlrädern ist anzumerken, daß das aufwendige und komplizierte Profilschleifen der Hohlkopfform entfallen kann, weil diese ja durch einen separat, und damit kostengünstiger zu fertigenden Einsatz verifiziert ist.In other words - as used in claim 1 - the essence of the present invention is ultimately to replace the tooth tips of the ring gear or the pinion quasi by an equivalent, ie equivalent use, due to its specific Design or shape in the area of the pressure build-up realizes a surface seal and thus ensures a minimal gap between the pinion head and the ring gear head. This also improves the volumetric efficiency, which ultimately has the consequence that the internal gear pump is suitable for higher pressures. At the same time, the extreme efforts required to minimize the gap when manufacturing or assembling an internal gear pump are eliminated; For example, there is no need to jointly spindle out the slide bearings of the bearing caps of an internal gear pump. With regard to the production of ring gears, it should be noted that the elaborate and complicated profile grinding of the hollow head shape can be omitted, because this is verified by a separate, and therefore more cost-effective, use.

Ein besonderer Vorteil der erfindungsgemäßen Konzeption besteht darin, daß über die erreichte Radialkompensation eine sinnvolle Druckaufbausteuerung über Steuerschlitze möglich ist.A particular advantage of the concept according to the invention is that a sensible pressure build-up control via control slots is possible via the radial compensation achieved.

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
ein Ausführungsbeispiel eines Dichtelements in Verbindung mit seinem Einbau im Zahnkopf eines Hohlrades.
The invention is explained in more detail 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. 2
an embodiment of a sealing element in connection with its installation in the tooth head of a ring gear.

Die Fig. 1 zeigt in einem Querschnitt eine sichellose, kopfdichtende und spielbehaftete jeweils mit einer Flanke dichtende Innenzahnradpumpe und zwar im Bereich eines Gehäusemittelteils 1 , dem sich - in Axialrichtung betrachtet - weitere Gehäuseteile anschließen. Die gesamte Pumpe mit den drei Gehäuseteilen habe eine axiale Gesamtlänge L. Ein auf einer Antriebswelle 4 befestigtes außenverzahntes Ritzel 5 steht im Eingriff mit einem innenverzahnten Hohlrad 6. Die Verzahnung 12 des Ritzels 5 und des Hohlrads 6 habe eine axiale Breite B, das Ritzel einen Wälzkreisdurchmesser dO; die Breite der Verzahnung sei größer als der Wälzkreisdurchmesser dO. 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 Gehäusemittelteil 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 erstreckenden Drucktasche 11, auf der gegenüberliegenden Seite der Pumpe. Die Zuströmung von Druckmedium zum Innenraum der Pumpe, also zu den Zahnlücken im Ritzel 5 und im Hohlrad 6 , welche die Förderung des Druckmediums bewirken, erfolgt über - vgl. Fig. 2 - radiale Durchbrüche 17 im Hohlrad 6. Diese Durchbrüche 17 gehen von der Mantelfläche 20 aus und münden im Zahngrund des Hohlrades 6.1 shows in a cross section a sickle-free, head-sealing and play-afflicted internal gear pump, each with a flank sealing, in the region of a housing middle part 1, which - viewed in the axial direction - Connect further housing parts. The entire pump with the three housing parts has an overall axial length L. An externally toothed pinion 5 fastened to a drive shaft 4 is in engagement with an internally toothed ring gear 6. The toothing 12 of the pinion 5 and the ring gear 6 have an axial width B, the pinion one Pitch circle diameter dO; the width of the toothing is larger than the pitch circle diameter dO. The pinion 5 and the ring gear 6 are not mounted coaxially, but eccentrically to one another; furthermore, the pinion 5 has one tooth less than the ring gear 6, so that in each case the outside of a tooth head 13 on the pinion 5 comes into contact with the inside of a tooth head 14 on the ring gear 6. A suction connection 7 can also be seen in the zone in which the teeth on the pinion 5 or ring gear 6 disengage when rotated in the direction of the arrow X. The suction connection 7 in the middle part 1 of the housing, in which the ring gear 6 and the pinion 5 are mounted, is adjoined in the axial direction to the adjacent housing parts by a suction pocket 8, which extends over part of the outer surface 20 of the ring gear 6. A pressure connection 10 is located, likewise starting from a pressure pocket 11 extending over a circumferential area on the ring gear, on the opposite side of the pump. The inflow of pressure medium to the interior of the pump, that is, to the tooth gaps in the pinion 5 and in the ring gear 6, which effect the delivery of the pressure medium, takes place via - cf. Fig. 2 - radial openings 17 in the ring gear 6. These openings 17 start from the outer surface 20 and open into the tooth base of the ring gear 6.

Die soweit beschriebene sichellose Innenzahnradpumpe ist Stand der Technik.The sickle-free internal gear pump described so far is state of the art.

Gemäß der Darstellung nach Fig. 1 sind nun - in an sich bereits bekannter Weise - an den Zahnköpfen des Hohlrades 6 jeweils Dichtelemente 30 eingesetzt, die gemäß der vorliegenden Erfindung besonders ausgebildet und gelagert bzw. gehalten sind. Diese erfindungsgemäßen Dichtelemente 30 sind in Fig. 2 vergrößert dargestellt.1, sealing elements 30 are now used in a manner known per se on the tooth heads of the ring gear 6, which are specially designed and mounted or held according to the present invention. These sealing elements 30 according to the invention are shown enlarged in FIG. 2.

Fig. 2 zeigt einen Ausschnitt des Hohlrades 6 im Bereich eines Zahnkopfes 14. Über den Umfang des Hohlrades 6 betrachtet sind die zur Zuströmung des Druckmediums zum Innenraum der Innenzahnradpumpe vorgesehenen Durchbrüche 17 eingearbeitet.2 shows a section of the ring gear 6 in the region of a tooth head 14. When viewed over the circumference of the ring gear 6, the openings 17 provided for the inflow of the pressure medium to the interior of the internal gear pump are incorporated.

Die Dichtelemente 30 sind jeweils im Übergangsbereich zwischen einem Durchbruch 17 und einem Zahnkopf 14 eingesetzt und zwar so, daß zum Durchbruch 17 hin ein Überlappungsbereich (Hinterschneidung) 32 entsteht. Die äußere, sprich kopfseitige Stirnfläche 33 des Dichtelements 30 ist so ausgebildet, daß sie bei symmetrischer Anordnung des Dichtelements 30 relativ zu einem Zahnkopf 14 dessen Soll-Kopfform, d.h. dessen geometrischer Idealform exakt entspricht.The sealing elements 30 are each used in the transition area between an opening 17 and a tooth head 14 in such a way that an overlap area (undercut) 32 is formed towards the opening 17. The outer end face 33 of the sealing element 30, that is to say on the head side, is designed such that when the sealing element 30 is arranged symmetrically relative to a tooth head 14, its nominal head shape, i.e. whose geometric ideal shape corresponds exactly.

Das Dichtelemente 30 selbst ist - wie an sicht bekannt - radial beweglich (vgl. Pfeil Y) in einer komplementär zum Querschnitt des Dichtelements 30 ausgebildeten Profilnut 34 im Zahnkopf 14 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 gerundete bzw. profilierte Stirnfläche 33 angrenzende Krempe mit einer an einer komplementären Anschlagfläche 36 des Zahnkopfes 14 anschlagenden konjugierten Anschlagfläche 37 des Dichtelements 30; 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 somit das Dichtelement 30 im Ausmaß der Spaltbreite Z radial bewegt werden.The sealing element 30 itself is - as is known at the view - radially movable (see arrow Y) in a complementary to the cross section of the sealing element 30 formed profile groove 34 mounted or inserted in the tooth head 14. A radially directed displacement of the sealing element 30 in the profile groove 34 can thus be verified. Said radial displacement is limited on both sides, on the one hand by a brim adjoining the rounded or profiled end face 33 with a conjugated stop face 37 of the sealing element 30 which abuts a complementary stop face 36 of the tooth head 14; the second stop is a positive one Fixed stop 38 of the foot part 39 of the sealing element 30 realized on the conjugated side surface 40 of the profile groove 34. Between these two stops, the sealing element 30 can thus be moved radially to the extent of the gap width Z.

Wie der zeichnerischen Darstellung nach Fig. 2 zu entnehmen ist, hat das Dichtelement 30 etwa die Querschnittsform eines Pilzes, wobei das in Umlaufrichtung X des Hohlrades 6 betrachtet nacheilende Fußteil konisch in Richtung Mantelfläche 20 verbreitert ist. Der genannte Festanschlag 38 ergibt sich so über die komplementäre Wandausbildung der Profilnut 34.2, the sealing element 30 has approximately the cross-sectional shape of a mushroom, the foot part lagging in the direction of rotation X of the ring gear 6 being widened conically in the direction of the lateral surface 20. Said fixed stop 38 thus results from the complementary wall formation of the profile groove 34.

An den Fuß des Dichtelements 30 schließt ein Freiraum 41 an, der über den genannten Hinterschnitt 32 bzw. Anschnitt des Durchbruchs 17 zum Druckraum der Pumpe hin offen ist. So entsteht - vom Fuß des Dichtelements 30 aus betrachtet - eine zum Druckraum hin offene Verbindung, über die das Dichtelement 30 beim Umlauf der Zahnräder druckbeaufschlagt wird und über die in der Druckaufbauphase das Dichtelemente 30 vom Systemdruck an den Ritzelkopf 13 angepreßt werden kann. Damit das Dichtelement 30 in der Saugphase der Innenzahnradpumpe nicht aufgrund der Flienkraft von der Anschlagfläche 36 abhebt, liegt dem Fuß des Dichtelements 30 im Freiraum 41 ein Federelement, insbesondere eine Wellfeder 42 gegenüber.At the foot of the sealing element 30 there is a free space 41, which is open to the pressure chamber of the pump via the undercut 32 or the cut of the opening 17. This creates - viewed from the foot of the sealing element 30 - a connection open to the pressure chamber, via which the sealing element 30 is pressurized during the rotation of the gears and via which the sealing element 30 can be pressed against the pinion head 13 by the system pressure in the pressure build-up phase. So that the sealing element 30 does not lift off the stop surface 36 due to the centrifugal force in the suction phase of the internal gear pump, a spring element, in particular a wave spring 42, is located opposite the foot of the sealing element 30.

Das im vorstehenden anhand von Fig. 2 offenbarte Dichtelement 30 muß letztendlich folgende Eigenschaften aufweisen:

  • Da die Liniendichtung an dem einen Kopfende beginnt und nach einem Drehwinkel von ca. 40° am anderen Kopfende endet, muß das Dichtelement über die ganze Kopfbreite ausgebildet werden.
  • Die Kopfform entspricht der vom Ritzelkopf bzw. vom Hohlradkopf erzeugten Geometrie.
  • Für eine mögliche Einlaufphase muß das Element ausweichen können, wobei um den Einlauf zu begrenzen, ein beidseitiger Endanschlag vorhanden sein muß.
The sealing element 30 disclosed above with reference to FIG. 2 must ultimately have the following properties:
  • Since the line seal begins at one head end and ends at the other head end after a rotation angle of approx. 40 °, the sealing element must be formed over the entire head width.
  • The head shape corresponds to the geometry generated by the pinion head or the ring gear head.
  • For a possible running-in phase, the element must be able to dodge, in order to limit the running-in, there must be an end stop on both sides.

Das Material des Dichtelements 30 muß gute Einlaufeigenschaften aufweisen, so daß als Werkstoff nur Buntmetall oder faserverstärkter Kunststoff in Frage kommt.The material of the sealing element 30 must have good running-in properties, so that only non-ferrous metal or fiber-reinforced plastic can be used as the material.

Ergänzend sei angemerkt, daß - axial über einen Bereich von 360° betrachtet - eine Führung für die Dichtleisten vorhanden sein muß, um ein seitliches Auswandern zu verhindern.In addition, it should be noted that - viewed axially over a range of 360 ° - there must be a guide for the sealing strips in order to prevent lateral migration.

Wenn im Vorstehenden anhand von Fig. 2 das erfindungsgemäße Dichtelement 30 nur in Verbindung mit einem Hohlrad 6 offenbart wurde, so können den vorgegebenen Bedingungen gerechtwerdende Dichtelemente gleichermaßen auch im Ritzel 5 eingebaut werden.If the sealing element 30 according to the invention was only disclosed in connection with a ring gear 6 in the foregoing with reference to FIG. 2, sealing elements which meet the specified conditions can equally be installed in the pinion 5.

Claims (6)

Sichellose Innenzahnradpumpe mit einem innenverzahnten Hohlrad (6) und einem mit dem Hohlrad (6) kämmenden Ritzel (5), die in einem gemeinsam gelagerten Gehäuseteil (1) drehbar gelagert sind, dessen axiale Erstreckung der Breite der Verzahnung (12) des Hohlrades (6) und des Ritzels (5) entspricht und welches einen Sauganschluß (7) und einen Druckanschluß (10) aufweist, wobei das Hohlrad (6) radiale Durchbrüche (17) für das zu pumpende Medium aufweist, und wobei in den Zahnköpfen (14) des Hohlrads (6) bzw. in den Zahnköpfen (13) des Ritzels (5) je ein in einer entsprechend ausgebildeten Profilnut (34) radial bewegliches Dichtelement (30) eingesetzt ist, das am gegenüberliegenden Zahnkopf des Ritzels (5) bzw. des Hohlrads (6) gleiten kann,
dadurch gekennzeichnet,
daß das Dichtelement (30) im Bereich der Gleitfläche so dimensioniert ist, daß es die gesamte Kopffläche des Hohlrad- bzw. Ritzel-Zahnkopfes einnimmt.Sickle-free internal gear pump with an internally toothed ring gear (6) and a pinion (5) meshing with the ring gear (6), which are rotatably mounted in a jointly mounted housing part (1), the axial extent of which is the width of the toothing (12) of the ring gear (6 ) and the pinion (5) and which has a suction connection (7) and a pressure connection (10), the ring gear (6) having radial openings (17) for the medium to be pumped, and wherein in the tooth tips (14) of the Ring gear (6) or in the tooth heads (13) of the pinion (5) a radially movable sealing element (30) is inserted in a correspondingly designed profile groove (34), which on the opposite tooth tip of the pinion (5) or the ring gear ( 6) can slide,
characterized,
that the sealing element (30) is dimensioned in the region of the sliding surface so that it takes up the entire head surface of the ring gear or pinion tooth head. Innenzahnradpumpe nach Anspruch 1,
dadurch gekennzeichnet,
daß die Kopfform des Dichtelements (30) der Kopfform der Zahnköpfe des Hohlrads (6) bzw. des Ritzels (5) und damit der vom Ritzel (5) bzw. vom Hohlrad (6) erzeugten Geometrie entsprechend ausgebildet ist.Internal gear pump according to claim 1,
characterized,
that the head shape of the sealing element (30) corresponds to the head shape of the tooth heads of the ring gear (6) or the pinion (5) and thus the geometry generated by the pinion (5) or the ring gear (6). Innenzahnradpumpe nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß das Dichtelement (30) und die Profilnut (34) zueinander komplementär so ausgebildet sind, daß die radiale Beweglichkeit des Dichtelements einerseits durch einen das Eintauchen in die Profilnut (34) begrenzenden Endanschlag und andererseits durch einen das Ausfahren aus der Profilnut (34) begrenzenden Festanschlag definiert ist.Internal gear pump according to claim 1 or 2,
characterized,
that the sealing element (30) and the profile groove (34) are complementary to each other so that the radial mobility of the sealing element on the one hand by an immersion in the profile groove (34) limiting end stop and on the other hand by an extension limiting the profile groove (34) Fixed stop is defined. Innenzahnradpumpe nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß das Dichtelement (30) der Profilnut (34) gegenüber über ein Federelement, insbesondere eine Wellfeder (4 ) vorgespannt eingesetzt ist.Internal gear pump according to one of claims 1 to 3,
characterized,
that the sealing element (30) of the profile groove (34) is inserted biased against a spring element, in particular a wave spring (4). Innenzahnradpumpe nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß an der Unterseite des Dichtelements (30) eine offene Verbindung zum Druckraum des zu pumpenden Mediums vorgesehen ist.Internal gear pump according to one of claims 1 to 4,
characterized,
that an open connection to the pressure chamber of the medium to be pumped is provided on the underside of the sealing element (30). Innenzahnradpumpe nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Dichtelemente (30) aus Buntmetall oder faserverstärktem Kunststoff gefertigt sind.Internal gear pump according to one of claims 1 to 5,
characterized,
that the sealing elements (30) are made of non-ferrous metal or fiber-reinforced plastic.
EP92120694A 1991-12-06 1992-12-04 Internal gear pump with sealings incorporated in the teeth Expired - Lifetime EP0545424B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4140293A DE4140293C2 (en) 1991-12-06 1991-12-06 Sickle-free internal gear pump with sealing elements inserted in the tooth heads
DE4140293 1991-12-06

Publications (2)

Publication Number Publication Date
EP0545424A1 true EP0545424A1 (en) 1993-06-09
EP0545424B1 EP0545424B1 (en) 1995-03-08

Family

ID=6446459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120694A Expired - Lifetime EP0545424B1 (en) 1991-12-06 1992-12-04 Internal gear pump with sealings incorporated in the teeth

Country Status (6)

Country Link
US (1) US5399079A (en)
EP (1) EP0545424B1 (en)
JP (2) JPH06193566A (en)
AT (1) ATE119627T1 (en)
DE (2) DE4140293C2 (en)
ES (1) ES2070575T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661454A1 (en) * 1993-12-17 1995-07-05 J.M. Voith GmbH Internal gear pump
EP0845596A1 (en) * 1996-11-27 1998-06-03 Voith Turbo GmbH Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads
EP0866225A1 (en) * 1997-03-22 1998-09-23 Voith Turbo GmbH & Co. KG Internal gear pump without crescent filling piece with sealing elements inserted in the tooth heads
EP0911524A1 (en) 1997-10-23 1999-04-28 Robert Bosch Gmbh Internal gear pump

Families Citing this family (11)

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DK0607497T3 (en) * 1993-01-18 1996-10-21 Voith Gmbh J M Internally toothed gear pump without seal with sealing elements inserted into the tooth heads
DE4419975A1 (en) * 1994-06-08 1995-12-14 Voith Gmbh J M Sickle-free internal gear pump with sealing elements inserted into the tooth heads and controlled via pressure channels on the back
DE4421255C1 (en) * 1994-06-17 1995-06-29 Otto Eckerle Packing pieceless inner gearwheel pump
DE19517296C2 (en) * 1995-05-11 2000-08-03 Otto Eckerle Internal gear pump without filler
DE19717697B4 (en) * 1997-04-26 2005-07-14 Robert Bosch Gmbh Internal gear pump
DE19804134A1 (en) * 1998-02-03 1999-08-12 Voith Turbo Kg Sickle-free internal gear pump
US6273695B1 (en) * 1999-03-26 2001-08-14 Voith Turbo Gmbh & Co. Kg Sickleless internal gear wheel pump with sealing elements inserted into the tooth tips
EP1039135A3 (en) * 1999-03-26 2001-12-19 Voith Turbo GmbH & Co. KG Internal gear pump with sealings incorporated in the teeth
KR20020019149A (en) * 2000-09-05 2002-03-12 이계안 Gear type oil pump
IT1394550B1 (en) * 2009-06-08 2012-07-05 Valentini SELF-PRIMING ROTOR FOR PNEUMATIC PALETTE ENGINE.
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

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US3277833A (en) * 1964-03-16 1966-10-11 Trw Inc Hydraulic device
DE4104397A1 (en) * 1990-03-09 1991-09-12 Voith Gmbh J M Internal gear pump without sickle element - incorporates method of dimensioning teeth to give compact design

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0661454A1 (en) * 1993-12-17 1995-07-05 J.M. Voith GmbH Internal gear pump
EP0845596A1 (en) * 1996-11-27 1998-06-03 Voith Turbo GmbH Internal gear pump with empty crescent space and spring biased sealing blades inserted in the teeth heads
EP0866225A1 (en) * 1997-03-22 1998-09-23 Voith Turbo GmbH & Co. KG Internal gear pump without crescent filling piece with sealing elements inserted in the tooth heads
US6093006A (en) * 1997-03-22 2000-07-25 Voith Turbo Gmbh & Co. Kg Non-crescent seal internal gear pump with sealing elements inserted in the tooth tips
EP0911524A1 (en) 1997-10-23 1999-04-28 Robert Bosch Gmbh Internal gear pump

Also Published As

Publication number Publication date
JPH1037U (en) 1998-02-13
DE59201606D1 (en) 1995-04-13
DE4140293A1 (en) 1993-06-09
ATE119627T1 (en) 1995-03-15
JP2606398Y2 (en) 2000-10-23
ES2070575T3 (en) 1995-06-01
DE4140293C2 (en) 1994-06-01
US5399079A (en) 1995-03-21
JPH06193566A (en) 1994-07-12
EP0545424B1 (en) 1995-03-08

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