EP0549929A1 - Internal gear pump - Google Patents

Internal gear pump Download PDF

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Publication number
EP0549929A1
EP0549929A1 EP92120960A EP92120960A EP0549929A1 EP 0549929 A1 EP0549929 A1 EP 0549929A1 EP 92120960 A EP92120960 A EP 92120960A EP 92120960 A EP92120960 A EP 92120960A EP 0549929 A1 EP0549929 A1 EP 0549929A1
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EP
European Patent Office
Prior art keywords
internal gear
pinion
web
gear pump
shaft
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.)
Granted
Application number
EP92120960A
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German (de)
French (fr)
Other versions
EP0549929B1 (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
JM Voith GmbH
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, JM Voith GmbH filed Critical Voith Turbo GmbH and Co KG
Publication of EP0549929A1 publication Critical patent/EP0549929A1/en
Application granted granted Critical
Publication of EP0549929B1 publication Critical patent/EP0549929B1/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
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses

Definitions

  • the invention relates to an internal gear pump according to the preamble of claim 1.
  • a pump of this type has become known from DE 41 04 397 A1.
  • Internal gear pumps of this type are used in simple design, i.e. each as a single pump.
  • a housing cover is provided axially outside the annular housing intermediate parts, which shuts off the front of the housing interior.
  • two or more internal gear pumps can also be interconnected in such a way that they are flanged together on the same axis. In this case, the aforementioned covers between two adjacent pumps are omitted.
  • the invention has for its object to design an internal gear pump according to the preamble of claim 1 such that the noise behavior is significantly reduced beyond what was previously achieved.
  • a web is provided on at least one of the two intermediate parts - seen in the axial direction - which bridges the relevant opening. This web should run at least approximately parallel to the direction of the medium flow emerging from the pressure connection. An arrangement of the web in an axial plane is particularly favorable.
  • the noise level at the highest pressures can be significantly reduced again, generally by 5 dB (A). This means that the pump can also be used for those cases in which it was not previously usable due to the high level of noise pollution.
  • the invention can be used in all conceivable types of internal gear pumps, for example in pumps with or without filler, in single pumps and also in multiple pumps.
  • the internal gear pump has an internally toothed ring gear 1, a pinion 2 meshing therewith, a shaft 3 carrying the pinion 2, a central housing part 4 which is annular and which surrounds the ring gear 1 and the pinion 2, and axially on both sides of the central housing part 4 each an intermediate housing part 5 and 6.
  • bearing caps 7 and 8 On both sides of the two intermediate parts there are bearing caps 7 and 8, which shut off the interior of the housing at the end.
  • the housing has a suction connection 9 and a pressure connection 10.
  • the pressure connection 10 is directed vertically downwards.
  • a filler 20 with a filler pin 21 is located in the working space between the ring gear 1 and the pinion 2.
  • the crucial point can be seen from FIGS. 3 to 5.
  • the intermediate housing part 5 shown here has a bore 5.1 through which the shaft 3 is guided.
  • This intermediate part 5 - just like the intermediate part 6 - forms the bearing for the shaft 3.
  • the intermediate part 5 has an opening 5.2. This extends in an arc over part of the circumference of the intermediate piece, in the present case over approximately 130 °.
  • the opening in the views according to FIGS. 4 and 5 has at least approximately the shape of a sausage. 5 that the opening 5.2 extends on both sides of a vertical axial plane of the shaft 3. In any case, the opening 5.2 - seen in a section perpendicular to the axis - will extend beyond a plane in which the pressure connection 10 lies.
  • a bridge is very important 5.3.
  • This bridge bridges the opening 5.2.
  • This web is located in an axial plane - in the present case in a vertical axial plane. It thus runs parallel to the direction of the medium flow emerging through the pressure connection. It is designed so that the medium flow, which is supposed to pass through the opening, is affected as little as possible. It can thus be designed to be streamlined. In addition, it only needs to be relatively thin. In addition, the web can be the fork, so that there are two or more, even thinner individual webs that are parallel to one another.
  • filler 20 shown with filler pin 21 is of no importance for the invention.
  • the invention can also be applied to pumps without these two elements.

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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

An internal gear pump having the following characteristics: an internal gear; a pinion which meshes with the internal gear and is mounted eccentrically with regard to the internal gear; a shaft supporting the pinion; a central ring-shaped housing part encompassing the internal gear and pinion and comprising a suction socket as well as a pressure socket; on both sides of the central housing part, a ring-shaped housing intermediate part each by which the shaft is supported; a cutout provided in each intermediate part and extending bow-shaped in peripheral direction; a web is provided which bridges the sole cutout; and the web is located at least approximately in that area of the pinion which diametrically opposes the pressure socket.

Description

Die Erfindung betrifft eine Innenzahnradpumpe gemäß dem Oberbegriff von Anspruch 1. Eine Pumpe dieser Art ist aus DE 41 04 397 A1 bekanntgeworden.The invention relates to an internal gear pump according to the preamble of claim 1. A pump of this type has become known from DE 41 04 397 A1.

Innenzahnradpumpen dieser Art werden in Einfach-Ausführung verwendet, d.h. jeweils nur als einzelne Pumpe. In diesem Falle ist axial außerhalb der ringförmigen Gehäuse-Zwischenteile jeweils ein Gehäusedeckel vorgesehen, der den Gehäuse-Innenraum stirnseitig absperrt. Es lassen sich jedoch auch zwei oder mehrere Innenzahnradpumpen derart zusammenschalten, daß sie gleichachsig aneinandergeflanscht werden. Hierbei entfallen die genannten Deckel zwischen zwei einander benachbarten Pumpen. Außerdem gibt es Pumpen, bei denen ein sogenanntes Füllstück mit zugehörendem Füllstückstift zwischen Ritzel und Hohlrad angeordnet ist, eine im wesentlichen sichelförmige Gestalt hat, und sich dabei im wesentlichen über den letzten Quadranten des Hohlraumes zwischen Hohlrad und Ritzel erstreckt.Internal gear pumps of this type are used in simple design, i.e. each as a single pump. In this case, a housing cover is provided axially outside the annular housing intermediate parts, which shuts off the front of the housing interior. However, two or more internal gear pumps can also be interconnected in such a way that they are flanged together on the same axis. In this case, the aforementioned covers between two adjacent pumps are omitted. In addition, there are pumps in which a so-called filler piece with associated filler pin is arranged between the pinion and ring gear, has a substantially crescent shape, and extends essentially over the last quadrant of the cavity between the ring gear and pinion.

Bei solchen Pumpen kommt es vor allem auf das Leistungsverhalten an, nämlich auf Parameter wie Fördervolumen, erzielbare Drücke und Wirkungsgrad. Immer wichtiger ist jedoch das Geräuschverhalten. Im Zuge der Humanisierung der Arbeitswelt wird hierauf immer mehr geachtet. Hierbei konnten in den letzten Jahren erhebliche Erfolge erzielt werden. Der Geräuschpegel lag bei einer bestimmten, bekannten Bauart im Jahre 1987 noch bei 78dB (A), während im Jahre 1991 69 dB (A) gemessen wurden. Um dies zu erreichen, wurden die wichtigsten konstruktiven Merkmale optimiert. Diese betrafen vor allem die Innenverzahnung, die Gleitlagerung sowie die radiale und axiale Kompensation. Jedoch läßt sich trotz aller Anstrengung mit den konventionellen Maßnahmen keine weitere Absenkung des Geräuschpegels erzielen. Aus diesem Grunde tritt bei hohen und höchsten Betriebsdrücken immer noch eine Lärmbelästigung auf, die sehr unangenehm ist. In gewissen Fällen muß sogar auf die Nutzung hoher Drücke verzichtet werden, oder es müssen aufwendige Maßnahmen zur Schallisolierung vorgenommen werden.With such pumps, it is primarily the performance that is important, namely parameters such as delivery volume, achievable pressures and efficiency. However, noise behavior is becoming increasingly important. In the course of the humanization of the world of work, more and more attention is paid to this. Here, considerable success has been achieved in recent years. The noise level for a certain known design was still 78dB (A) in 1987, while 69 dB (A) was measured in 1991. To achieve this, the most important design features have been optimized. These mainly concerned the internal teeth, the Plain bearings as well as radial and axial compensation. However, despite all efforts, the conventional measures cannot achieve a further reduction in the noise level. For this reason, noise is still unpleasant at high and very high operating pressures. In certain cases, it is even necessary to dispense with the use of high pressures, or complex measures for sound insulation have to be taken.

Der Erfindung liegt die Aufgabe zugrunde, eine Innenzahnradpumpe gemäß dem Oberbegriff von Anspruch 1 derart zu gestalten, daß das Geräuschverhalten über das bisher erzielte Maß hinaus deutlich abgesenkt wird.The invention has for its object to design an internal gear pump according to the preamble of claim 1 such that the noise behavior is significantly reduced beyond what was previously achieved.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 gelöst. Demgemäß wird an wenigstens einem der beiden Zwischenteile - in axialer Richtung gesehen - ein Steg vorgesehen, der die betreffende Durchbrechung überbrückt. Dieser Steg soll wenigstens annähernd parallel zur Richtung des aus dem Druckanschluß austretenden Mediumstromes verlaufen. Besonders günstig ist eine Anordnung des Steges in einer Axialebene.This object is solved by the characterizing features of claim 1. Accordingly, a web is provided on at least one of the two intermediate parts - seen in the axial direction - which bridges the relevant opening. This web should run at least approximately parallel to the direction of the medium flow emerging from the pressure connection. An arrangement of the web in an axial plane is particularly favorable.

Durch diese verblüffend einfache und billige Lösung läßt sich der Geräuschpegel bei höchsten Drücken nochmals erheblich absenken, im allgemeinen um 5 dB (A). Damit wird die Pumpe auch für solche Bedarfsfälle einsetzbar, bei der sie bisher wegen der hohen Lärmbelästigung nicht verwendbar war.With this amazingly simple and inexpensive solution, the noise level at the highest pressures can be significantly reduced again, generally by 5 dB (A). This means that the pump can also be used for those cases in which it was not previously usable due to the high level of noise pollution.

Die Erfindung läßt sich bei allen denkbaren Bauarten von Innenzahnradpumpen anwenden, beispielsweise bei Pumpen mit oder ohne Füllstück, bei Einzelpumpen, wie auch bei Mehrfachpumpen.The invention can be used in all conceivable types of internal gear pumps, for example in pumps with or without filler, in single pumps and also in multiple pumps.

Die Erfindung ist anhand der Zeichnung näher erläutert. Darin ist im einzelnen folgendes dargestellt:

Fig. 1
zeigt eine Innenzahnradpumpe in einem Teil-Längsschnitt.
Fig. 2
zeigt die Pumpe gemäß Fig. 1 in einem achssenkrechten Schnitt.
Fig. 3
zeigt in einer gegenüber den Figuren 1 und 2 leicht vergrößerten Darstellung eines der beiden Gehäuse-Zwischenteile.
Fig. 4
zeigt eine Draufsicht auf das Zwischenteil gemäß Fig. 3 in Blickrichtung der Pfeile IV-IV.
Fig. 5
zeigt eine Draufsicht auf das Zwischenteil gemäß Fig. 3 in Blickrichtung gemäß der Pfeile V-V.
The invention is explained in more detail with reference to the drawing. The following is shown in detail:
Fig. 1
shows an internal gear pump in a partial longitudinal section.
Fig. 2
shows the pump of FIG. 1 in an axially perpendicular section.
Fig. 3
shows in a slightly enlarged view compared to Figures 1 and 2, one of the two intermediate housing parts.
Fig. 4
shows a plan view of the intermediate part of FIG. 3 in the direction of arrows IV-IV.
Fig. 5
shows a plan view of the intermediate part of FIG. 3 in the direction of view according to the arrows VV.

Die Innenzahnradpumpe weist ein innenverzahntes Hohlrad 1 auf, ein hiermit kämmendes Ritzel 2, eine das Ritzel 2 tragende Welle 3, ein zentrales Gehäuseteil 4, das ringförmig ist und das das Hohlrad 1 und das Ritzel 2 umschließt, sowie axial beidseits des zentralen Gehäuseteiles 4 je ein Gehäuse-Zwischenteil 5 und 6. Beidseits der beiden Zwischenteile befinden sich Lagerdeckel 7 und 8, die den Gehäuse-Innenraum stirnseitig absperren.The internal gear pump has an internally toothed ring gear 1, a pinion 2 meshing therewith, a shaft 3 carrying the pinion 2, a central housing part 4 which is annular and which surrounds the ring gear 1 and the pinion 2, and axially on both sides of the central housing part 4 each an intermediate housing part 5 and 6. On both sides of the two intermediate parts there are bearing caps 7 and 8, which shut off the interior of the housing at the end.

Das Gehäuse weist einen Sauganschluß 9 sowie einen Druckanschluß 10 auf. Im vorliegenden Falle ist der Druckanschluß 10 senkrecht nach unten gerichtet. Im Arbeitsraum zwischen dem Hohlrad 1 und dem Ritzel 2 befindet sich ein Füllstück 20 mit einem Füllstückstift 21.The housing has a suction connection 9 and a pressure connection 10. In the present case, the pressure connection 10 is directed vertically downwards. A filler 20 with a filler pin 21 is located in the working space between the ring gear 1 and the pinion 2.

Das Entscheidende ist aus den Figuren 3 bis 5 zu erkennen. Das hierin dargestellte Gehäuse-Zwischenteil 5 weist eine Bohrung 5.1 auf, durch die die Welle 3 hindurchgeführt wird. Dieses Zwischenteil 5 - genau wie das Zwischenteil 6 - bildet die Lagerung für die Welle 3. Das Zwischenteil 5 weist eine Durchbrechung 5.2 auf. Diese erstreckt sich bogenförmig über einen Teil des Umfanges des Zwischenstückes, im vorliegenden Falle über ca. 130°. Wie man sieht, hat die Durchbrechung in den Ansichten gemäß der Figuren 4 und 5 wenigstens annähernd die Gestalt einer Wurst. In Fig. 5 erkennt man, daß sich die Durchbrechung 5.2 beidseits einer senkrechten Axialebene der Welle 3 erstreckt. In jedem Falle wird sich die Durchbrechung 5.2 - in einem achssenkrechten Schnitt gesehen - über eine Ebene hinaus erstrecken, in welcher der Druckanschluß 10 liegt.The crucial point can be seen from FIGS. 3 to 5. The intermediate housing part 5 shown here has a bore 5.1 through which the shaft 3 is guided. This intermediate part 5 - just like the intermediate part 6 - forms the bearing for the shaft 3. The intermediate part 5 has an opening 5.2. This extends in an arc over part of the circumference of the intermediate piece, in the present case over approximately 130 °. As can be seen, the opening in the views according to FIGS. 4 and 5 has at least approximately the shape of a sausage. 5 that the opening 5.2 extends on both sides of a vertical axial plane of the shaft 3. In any case, the opening 5.2 - seen in a section perpendicular to the axis - will extend beyond a plane in which the pressure connection 10 lies.

Ganz entscheidend ist ein Steg 5.3. Dieser überbrückt die Durchbrechung 5.2. Dieser Steg befindet sich in einer Axialebene - im vorliegenden Falle in einer senkrechten Axialebene. Er verläuft damit parallel zur Richtung des durch den Druckanschluß austretenden Mediumstromes. Er ist so gestaltet, daß der Mediumstrom, der ja durch die Durchbrechung hindurchtreten soll, möglichst wenig beeinträchtigt wird. Er kann somit strömungsgünstig gestaltet sein. Außerdem braucht er nur verhältnismäßig dünn ausgebildet zu sein. Außerdem kann der Steg die Gabel sein, so daß zwei oder mehrere, zueinander parallele, noch dünnere Einzelstege vorhanden sind.A bridge is very important 5.3. This bridges the opening 5.2. This web is located in an axial plane - in the present case in a vertical axial plane. It thus runs parallel to the direction of the medium flow emerging through the pressure connection. It is designed so that the medium flow, which is supposed to pass through the opening, is affected as little as possible. It can thus be designed to be streamlined. In addition, it only needs to be relatively thin. In addition, the web can be the fork, so that there are two or more, even thinner individual webs that are parallel to one another.

Werden mehrere Einzelpumpen zu Mehrstrompumpen miteinander kombiniert, so entfallen die aus den Figuren 1 und 2 erkennbaren Lagerdeckel 7 und 8 bei jenen Pumpen, die an benachbarte Pumpen angrenzen.If several individual pumps are combined to form multi-flow pumps, the bearing caps 7 and 8 shown in FIGS. 1 and 2 are omitted for those pumps which adjoin adjacent pumps.

Das dargestellte Füllstück 20 mit Füllstückstift 21 ist ohne Bedeutung für die Erfindung. Die Erfindung läßt sich auch anwenden bei Pumpen ohne diese beiden Elemente.The filler 20 shown with filler pin 21 is of no importance for the invention. The invention can also be applied to pumps without these two elements.

Claims (4)

Innenzahnradpumpe mit den folgenden Merkmalen: 1.1 ein innenverzahntes Hohlrad (1); 1.2 ein mit dem Hohlrad (1) kämmendes Ritzel (2), das in Bezug auf das Hohlrad (1) exzentrisch gelagert ist; 1.3 eine das Ritzel (2) tragende Welle (3); 1.4 ein zentrales, ringförmiges Gehäuseteil (4), das das Hohlrad (1) und das Ritzel (2) umschließt und einen Sauganschluß (9) sowie einen Druckanschluß (10) umfaßt; 1.5 beidseits des zentralen Gehäuseteiles (4) je ein ringförmiges Gehäuse-Zwischenteil (5, 6), in dem die Welle (3) gelagert ist; 1.6 eine in jedem Zwischenteil (5, 6) vorgesehene Durchbrechung (5.2), die sich in Umfangsrichtung bogenförmig erstreckt; gekennzeichnet durch die folgenden Merkmale: 1.7 es ist ein Steg (5.3) vorgesehen, der die einzelne Durchbrechung (5.2) überbrückt; 1.8 der Steg befindet sich wenigstens annähernd in jenem Bereich des Ritzels (2), der dem Druckanschluß (10) diametral gegenüberliegt. Internal gear pump with the following features: 1.1 an internally toothed ring gear (1); 1.2 a with the ring gear (1) meshing pinion (2) which is mounted eccentrically with respect to the ring gear (1); 1.3 a shaft (3) carrying the pinion (2); 1.4 a central, annular housing part (4) which surrounds the ring gear (1) and the pinion (2) and comprises a suction connection (9) and a pressure connection (10); 1.5 on both sides of the central housing part (4) each have an annular intermediate housing part (5, 6) in which the shaft (3) is mounted; 1.6 an opening (5.2) provided in each intermediate part (5, 6), which extends in an arcuate manner in the circumferential direction; characterized by the following features: 1.7 a web (5.3) is provided which bridges the individual opening (5.2); 1.8 the web is at least approximately in that area of the pinion (2) which is diametrically opposite the pressure connection (10). Innenzahnradpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Steg (5.3) im wesentlichen parallel zur Richtung des Mediumstromes im Druckanschluß (10) angeordnet ist.Internal gear pump according to claim 1, characterized in that the web (5.3) is arranged essentially parallel to the direction of the medium flow in the pressure connection (10). Innenzahnradpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Steg in einer Axialebene der Welle (3) angeordnet ist.Internal gear pump according to claim 1 or 2, characterized in that the web is arranged in an axial plane of the shaft (3). Innenzahnradpumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zwei oder mehrere Stege vorgesehen sind.Internal gear pump according to one of claims 1 to 3, characterized in that two or more webs are provided.
EP92120960A 1991-12-26 1992-12-09 Internal gear pump Expired - Lifetime EP0549929B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4142799A DE4142799C1 (en) 1991-12-26 1991-12-26
DE4142799 1991-12-26

Publications (2)

Publication Number Publication Date
EP0549929A1 true EP0549929A1 (en) 1993-07-07
EP0549929B1 EP0549929B1 (en) 1996-02-28

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ID=6448037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120960A Expired - Lifetime EP0549929B1 (en) 1991-12-26 1992-12-09 Internal gear pump

Country Status (5)

Country Link
US (1) US5299923A (en)
EP (1) EP0549929B1 (en)
JP (1) JPH0688576A (en)
AT (1) ATE134744T1 (en)
DE (2) DE4142799C1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012104839U1 (en) 2012-12-12 2013-01-18 Eckerle Industrie-Elektronik Gmbh Internal gear machine (pump or motor)
DE202013102079U1 (en) 2013-05-13 2013-05-21 Eckerle Industrie-Elektronik Gmbh Gear machine with positive axial locking of a bearing bush of a shaft bearing

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JP3291954B2 (en) * 1995-01-31 2002-06-17 日産自動車株式会社 Pump for automatic transmission
DE19613835A1 (en) * 1996-04-06 1997-10-09 Eckerle Rexroth Gmbh Co Kg Inner toothed wheel machine (Pump or engine)
US5975556A (en) * 1997-06-18 1999-11-02 Lehmann; Ernest Snowboard binding
DE19930911C1 (en) * 1999-07-06 2000-07-20 Voith Turbo Kg Geared pump has a pinion with external teeth and a meshing hollow wheel with internal teeth and axial disks and springs for a reversing action with axial compensation for the high pressures in the closed circuit
DE10040692C1 (en) * 2000-08-19 2001-09-20 Bosch Gmbh Robert Internal gear pump to supply fuel from suction to pressure channel has internally toothed ring gear and eccentric outer toothed pinion driven on drive shaft, to form pump action
EP1523608A2 (en) * 2001-02-08 2005-04-20 Outland Technologies (USA), Inc. Rotary positive displacement device
US6659728B2 (en) * 2001-11-09 2003-12-09 Viking Pump, Inc. Liquid dispensing pump system
DE10341841A1 (en) * 2003-09-09 2005-04-07 Siemens Ag According to the gerotor principle working fuel pump
JP4272112B2 (en) * 2004-05-26 2009-06-03 株式会社日立製作所 Motor-integrated internal gear pump and electronic equipment
JP2016125361A (en) * 2014-12-26 2016-07-11 株式会社デンソー Fuel pump
CN105422442A (en) * 2015-12-31 2016-03-23 江苏驰翔精密齿轮股份有限公司 Internal gear pump

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Publication number Priority date Publication date Assignee Title
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
DE4120757A1 (en) * 1990-06-25 1992-01-02 Zahnradfabrik Friedrichshafen Sliding vane fluid pump - has damping chambers in housing which reduce noise and pressure pulsations

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DE1728085C2 (en) * 1968-08-22 1986-12-04 Eckerle, Otto, 7502 Malsch Gear pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE4120757A1 (en) * 1990-06-25 1992-01-02 Zahnradfabrik Friedrichshafen Sliding vane fluid pump - has damping chambers in housing which reduce noise and pressure pulsations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 274 (M-725)29. Juli 1988 & JP-A-63 057 878 ( SUMITOMO ELECTRIC ) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012104839U1 (en) 2012-12-12 2013-01-18 Eckerle Industrie-Elektronik Gmbh Internal gear machine (pump or motor)
DE202013102079U1 (en) 2013-05-13 2013-05-21 Eckerle Industrie-Elektronik Gmbh Gear machine with positive axial locking of a bearing bush of a shaft bearing

Also Published As

Publication number Publication date
EP0549929B1 (en) 1996-02-28
DE4142799C1 (en) 1993-04-15
ATE134744T1 (en) 1996-03-15
US5299923A (en) 1994-04-05
DE69208632D1 (en) 1996-04-04
JPH0688576A (en) 1994-03-29

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