EP0677660A1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
EP0677660A1
EP0677660A1 EP94105347A EP94105347A EP0677660A1 EP 0677660 A1 EP0677660 A1 EP 0677660A1 EP 94105347 A EP94105347 A EP 94105347A EP 94105347 A EP94105347 A EP 94105347A EP 0677660 A1 EP0677660 A1 EP 0677660A1
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EP
European Patent Office
Prior art keywords
gear pump
recess
rotors
recesses
product channel
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
EP94105347A
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German (de)
French (fr)
Other versions
EP0677660B1 (en
Inventor
Roger Dr.-Ing. Stehr
Peter Blume
Marco Benetti
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.)
Maag Pump Systems AG
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Maag Pump Systems AG
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Priority to AT94105347T priority Critical patent/ATE138159T1/en
Priority to ES94105347T priority patent/ES2087780T3/en
Priority to EP94105347A priority patent/EP0677660B1/en
Priority to DK94105347.2T priority patent/DK0677660T3/en
Priority to DE59400284T priority patent/DE59400284D1/en
Application filed by Maag Pump Systems AG filed Critical Maag Pump Systems AG
Priority to JP7081365A priority patent/JPH07279861A/en
Priority to US08/417,853 priority patent/US5547356A/en
Publication of EP0677660A1 publication Critical patent/EP0677660A1/en
Publication of EP0677660B1 publication Critical patent/EP0677660B1/en
Application granted granted Critical
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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • 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
    • F04C2/088—Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement

Definitions

  • the present invention relates to a gear pump according to the preamble of claim 1 and its use.
  • EP-A-0 559 582 in which a volume-increasing relief is provided on the pressure side of the product channel.
  • Fig. 1 the product channel 1 is shown, cut along its axis A and parallel to the axis B one of the two provided, not shown, externally toothed meshing rotors.
  • the meshing area of the rotors is essentially in the section plane E of the selected representation. Furthermore, it is symmetrical with respect to a plane through the axis B and the axis, not shown here, of the second rotor lying above it in the selected illustration.
  • both the inlet side faces the inlet duct 1a and the outlet side, i.e. facing the outlet channel 1b, into the product channel wall 3 of the product channel 1, in which the rotors mesh, each with a volume-increasing recess 5a1, a2 formed, preferably as shown with 5b1 and 5b2, on both sides opposite each other above the product channel 1.
  • the conveying medium can relax in the provided recesses 5, which prevents the occurrence of high pinching pressure peaks and improves the filling behavior of the tooth gaps on the inlet channel side.
  • the recesses 5a, b are arranged in pairs symmetrically to the plane E B , which runs through the two axes B of the rotor shafts.
  • bearing bodies 7 are provided in the pump housing, as shown in dashed lines in FIGS. 1 and 2 with respect to the one journal.
  • the recesses 5 according to the invention are then continuous from the wall area of the product channel defined by the pump housing into the wall area of the product channel defined by the end face of the bearing body 7 Passing channel, trained.
  • the inventive recesses 6a1 or 6a2, 6b1 or 6b2 are incorporated, each of which is in the form of Have spherical segments.
  • the recesses define spherical spherical caps in pairs, or more generally, continuously curved room surfaces.
  • the preferred embodiment variant shown in FIG. 3 ensures that no dead spaces are created by the inventions provided according to the invention.
  • the pump according to the invention is constructed with rotors with lubricated sliding bearings, then the continuity conditions, which have already been explained above, apply to the transition of the receptacles of product channel sections defined in the pump housing into bearing bodies 7 defined according to the invention.
  • a gear pump according to the invention in particular designed according to the preferred embodiment variant of FIG. 3, is excellently suitable for conveying shear-sensitive and / or thermosensitive media, in particular polymer melts, such as e.g. PVC, rubber or biopolymers.
  • shear-sensitive and / or thermosensitive media in particular polymer melts, such as e.g. PVC, rubber or biopolymers.
  • polymer melts such as e.g. PVC, rubber or biopolymers.
  • it is also suitable for the conveyance of foodstuffs in which the requirements regarding the absence of dead space are similar to those for the melts mentioned.

Abstract

The gearwheel pump has at least two externally toothed meshing rotors in a product channel. On both sides of the meshing area in relation to a plane (E_B) joining the rotor axes in the product channel walling (3) a vol. enlarging recess (5a1,5a2,5b1,5b2) is formed. The recesses are formed by permanently curved surfaces, pref. by ball surfaces, whereby only on the pressure side of the plane does a recess need to be provided. The rotors are located in product-lubricated slide bearings. The recess(es) is/are formed at least partly in the part of the product channel walling forming the face surfaces of the slide bearing body. <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Zahnradpumpe nach dem Oberbegriff von Anspruch 1 sowie deren Verwendung.The present invention relates to a gear pump according to the preamble of claim 1 and its use.

Bei Zahnradpumpen mit aussenverzahnten, dicht kämmenden Wellen treten beim Ausquetschvorgang auf die Druckseite, hervorgerufen durch den Eintritt eines Zahnes der angetriebenen Welle in die korrespondierende Zahnlücke an der ungetriebenen Welle, erhebliche lokale Druckspitzen auf. Diese Quetschdrücke erreichen bei der Förderung höher viskoser Medien, wie z.B. von Polymerschmelzen, Spitzenwerte von einigen 100bar. Aus diesem, wenn auch sehr kurzfristigen extremen Druckanstieg resultiert eine erhebliche thermische Beanspruchung und Scherbeanspruchung des Fördermediums.In gear pumps with externally toothed, closely meshing shafts, considerable local pressure peaks occur during the squeezing process on the pressure side, caused by the entry of a tooth of the driven shaft into the corresponding tooth gap on the non-driven shaft. These squeeze pressures reach when conveying higher-viscosity media, e.g. of polymer melts, peak values of some 100 bar. This, albeit very short-term, extreme pressure increase results in considerable thermal stress and shear stress on the pumped medium.

Bezüglich Ausführung des Produktekanals einer Zahnradpumpe zur Förderung auch von scherempfindlichen und/oder thermosensitiven Medien kann beispielsweise auf die GB-A-85 00 273 bzw. auf die EP-A-0 189 670 hingewiesen werden. Die erwähnten Quetschdruckspitzen führen aber auch bei solchen vorbekannten Pumpen dazu, dass sie insbesondere für die Förderung der genannten scherempfindlichen und/oder thermosensitiven Medien nicht bedenkenlos eingesetzt werden können.With regard to the design of the product channel of a gear pump for conveying also shear-sensitive and / or thermosensitive media, reference can be made, for example, to GB-A-85 00 273 or EP-A-0 189 670. However, the squeeze pressure peaks mentioned also lead to such known pumps that they cannot be used without hesitation, in particular for conveying the shear-sensitive and / or thermosensitive media mentioned.

Bezüglich einer Möglichkeit, die Entstehung der genannten Quetschdruckspitzen mindestens zu mindern, sei auf die EP-A-0 559 582 verwiesen, bei welcher auf der Druckseite des Produktekanals eine volumenvergrössernde Entlastungseinnehmung vorgesehen ist.With regard to a possibility of at least reducing the occurrence of the squeezing pressure peaks mentioned, reference is made to EP-A-0 559 582, in which a volume-increasing relief is provided on the pressure side of the product channel.

Es ist Aufgabe der vorliegenden Erfindung, eine Zahnradpumpe eingangs genannter Art zu schaffen, bei der das Entstehen von Druckspitzen im Kämmbereich der Rotoren weiter wesentlich reduziert wird und die Füllverhältnisse saugseitig gleichzeitig verbessert werden.It is an object of the present invention to provide a gear pump of the type mentioned in the introduction, in which the formation of pressure peaks in the combing area of the rotors is further reduced significantly and the filling conditions on the suction side are improved at the same time.

Dies wird bei der Ausbildung der Zahnradpumpe nach dem kennzeichnenden Teil von Anspruch 1 erreicht, nämlich dadurch, dass beidseits des Bereichs des Kämmens bezüglich einer die Rotorachsen verbindenden Ebene in der Produktekanalwand je eine volumenvergrössernde Einnehmung eingeformt ist.This is achieved in the design of the gear pump according to the characterizing part of claim 1, namely in that a volume-increasing recess is formed on both sides of the area of the combing with respect to a plane connecting the rotor axes in the product channel wall.

Bevorzugte Ausführungsformen der erfindungsgemässen Zahnradpumpe sind in den Ansprüchen 2 bis 5 spezifiziert und eine besonders bevorzugte Verwendung einer solchen Pumpe in Anspruch 6.Preferred embodiments of the gear pump according to the invention are specified in claims 2 to 5 and a particularly preferred use of such a pump in claim 6.

Die Erfindung wird anschliessend beispielsweise anhand von Figuren erläutert.The invention is subsequently explained, for example, using figures.

Es zeigen:

Fig. 1
perspektivisch die Ansicht eines Schnittes durch eine bekannte Zahnradpumpe, wobei der Schnitt in die Achse des Produktekanals gelegt ist und parallel zu den Achsen der Rotoren;
Fig. 2
eine erste bevorzugte Ausführungsform der erfindungsgemässen Zahnradpumpe in einer Darstellung analog zu derjenigen von Fig. 1;
Fig. 3
eine besonders bevorzugte Ausführungsvariante einer erfindungsgemässen Zahnradpumpe in Darstellung analog zu den Fig. 1 und 2.
Show it:
Fig. 1
perspective the view of a section through a known gear pump, the section being placed in the axis of the product channel and parallel to the axes of the rotors;
Fig. 2
a first preferred embodiment of the gear pump according to the invention in a representation analogous to that of Fig. 1;
Fig. 3
a particularly preferred embodiment of a gear pump according to the invention in a representation analogous to FIGS. 1 and 2.

In Fig. 1 ist der Produktekanal 1 dargestellt, geschnitten entlang seiner Achse A und parallel zur Achse B eines der beiden vorgesehenen, nicht dargestellten, aussenverzahnt kämmenden Rotoren. Der Kämmbereich der Rotoren liegt im wesentlichen in der Schnittebene E der gewählten Darstellung. Im weiteren ist er bezüglich einer Ebene durch die Achse B und die hier nicht dargestellte Achse des zweiten, in der gewählten Darstellung darüberliegenden Rotors symmetrisch.In Fig. 1 the product channel 1 is shown, cut along its axis A and parallel to the axis B one of the two provided, not shown, externally toothed meshing rotors. The meshing area of the rotors is essentially in the section plane E of the selected representation. Furthermore, it is symmetrical with respect to a plane through the axis B and the axis, not shown here, of the second rotor lying above it in the selected illustration.

Erfindungsgemäss gemäss Fig. 2 ist sowohl einlaufseitig, wie beispielsweise dargestellt dem Einlaufkanal 1a zugewandt, wie auch auslassseitig, d.h. dem Auslasskanal 1b zugewandt, in die Produktekanalwandung 3 des Produktekanals 1, worin die Rotoren kämmen, je eine volumenvergrössernde Einnehmung 5a₁, a₂ eingeformt, vorzugsweise wie mit 5b₁ und 5b₂ dargestellt, beidseitig sich über dem Produktekanal 1 gegenüberliegend.According to the invention shown in FIG. 2, both the inlet side, as shown, for example, faces the inlet duct 1a and the outlet side, i.e. facing the outlet channel 1b, into the product channel wall 3 of the product channel 1, in which the rotors mesh, each with a volume-increasing recess 5a₁, a₂ formed, preferably as shown with 5b₁ and 5b₂, on both sides opposite each other above the product channel 1.

Dadurch wird ermöglicht, dass im ganzen Kämmbereich, sowohl bei sich annähernden Zahn/Zahnlücken wie auch sich entfernenden, das Fördermedium sich in die vorgesehenen Einnehmungen 5 druckentspannen kann, womit das Entstehen hoher Quetschdruckspitzen verhindert wird und einlasskanalseitig eine Verbesserung des Füllverhaltens der Zahnlücken erzielt wird.This makes it possible that in the entire combing area, both with approaching tooth / tooth gaps as well as moving away, the conveying medium can relax in the provided recesses 5, which prevents the occurrence of high pinching pressure peaks and improves the filling behavior of the tooth gaps on the inlet channel side.

Die Einnehmungen 5a, b sind paarweise symmetrisch zur Ebene EB, welche durch die beiden Achsen B der Rotorwellen läuft, angeordnet.The recesses 5a, b are arranged in pairs symmetrically to the plane E B , which runs through the two axes B of the rotor shafts.

Wenn, wie dies meistens der Fall ist, die Rotorwellen fördergutgeschmiert gleitgelagert sind, so sind im Pumpengehäuse, wie in den Fig. 1 und 2 bezüglich des einen Lagerzapfens gestrichelt dargestellt, Lagerkörper 7 vorgesehen. Die erfindungsgemässen Einnehmungen 5 sind dann je nach ihrer Ausdehnung, stetig von dem durch das Pumpengehäuse definierten Wandungsbereich des Produktekanals in den durch die Stirnfläche der Lagerkörper 7 definierten Wandungsbereich des besagten Kanals übergehend, ausgebildet.If, as is usually the case, the rotor shafts are lubricated with lubrication in the conveyed material, bearing bodies 7 are provided in the pump housing, as shown in dashed lines in FIGS. 1 and 2 with respect to the one journal. Depending on their extent, the recesses 5 according to the invention are then continuous from the wall area of the product channel defined by the pump housing into the wall area of the product channel defined by the end face of the bearing body 7 Passing channel, trained.

Selbstverständlich erstrecken sich die erfindungsgemäss vorgesehenen Einnehmungen genau gleich in der oberen weggeschnittenen Hälfte des Produktekanals.Of course, the recesses provided according to the invention extend in exactly the same way in the upper cut-off half of the product channel.

Nun ist zu beachten, dass insbesondere bei der Förderung von scherempfindlichen und/oder thermosensitiven Medien grundsätzlich im Produktekanal keine toten Ecken und Kanten vorgesehen sein sollten. Ansonsten ergeben sich Ablagerungen des Fördermediums und, daraus resultierend, eine entsprechende Schädigung des geförderten Mediums.It should now be noted that, in particular when conveying shear-sensitive and / or thermosensitive media, no dead corners and edges should be provided in the product channel. Otherwise deposits of the pumped medium result and, as a result, damage to the pumped medium.

Diesen Anforderungen in vermehrtem Masse Rechnung zu tragen, ist Zweck der in Fig. 3 dargestellten, insbesondere bevorzugten Ausführungsvarianten der erfindungsgemässen Einnehmungen. Auch in Fig. 3 sind dieselben Bezugszeichen verwendet, abgesehen von der Bezeichnung der besonders bevorzugten Einnehmungen.To take these requirements into account to an increasing extent is the purpose of the particularly preferred embodiment variants of the receptacles according to the invention shown in FIG. The same reference numerals are also used in FIG. 3, apart from the designation of the particularly preferred receptacles.

Bei der bevorzugten Ausführungsvariante, ausgehend von der Lösung gemäss Fig. 2, sind beidseits der Ebene EB, wie sie im Zusammenhang mit Fig. 2 definiert wurde, erfindungsgemässe Einnehmungen 6a₁ bzw. 6a₂, 6b₁ bzw. 6b₂ eingearbeitet, die je die Form von Kugelsegmenten aufweisen. Bei zusammengestellter Pumpe definieren die Einnehmungen je paarweise Kugelkalotten bzw. genereller je stetig gekrümmte Raumflächen.In the preferred embodiment variant, starting from the solution according to FIG. 2, on both sides of the plane E B , as defined in connection with FIG. 2, the inventive recesses 6a₁ or 6a₂, 6b₁ or 6b₂ are incorporated, each of which is in the form of Have spherical segments. When the pump is assembled, the recesses define spherical spherical caps in pairs, or more generally, continuously curved room surfaces.

Die bevorzugte, anhand von Fig. 3 dargestellte Ausbildungsvariante stellt sicher, dass durch die erfindungsgemäss vorgesehenen Einnehmungen keinerlei Toträume geschaffen werden. Selbstverständlich kann von idealen ellipsoid- bzw. kugelsegmentförmigen Einnehmungen abgewichen werden, und es können grundsätzlich Einnehmungen vorgesehen werden mit stetig gekrümmten Einnehmungsflächen. Auch wenn nur druckseitig eine solche Einnehmung entsprechend 6a₂ vorgesehen wird, wird das Pumpenverhalten bezüglich der Anforderung keiner Toträume wesentlich verbessert.The preferred embodiment variant shown in FIG. 3 ensures that no dead spaces are created by the inventions provided according to the invention. Of course, there can be deviations from ideal ellipsoidal or spherical segment-shaped recesses, and in principle recesses can be provided with continuously curved ones Capture areas. Even if such a recess corresponding to 6a₂ is only provided on the pressure side, the pump behavior with regard to the requirement of no dead spaces is significantly improved.

Ist die erfindungsgemässe Pumpe mit fördermediumgeschmiert gleitgelagerten Rotoren ausgebildet, so gelten betreffs Uebergang der erfindungsgemäss eingearbeiteten Einnehmungen von Pumpengehäuse-definierten Produktekanalpartien in Lagerkörper-7-definierte die Stetigkeitsbedingungen, die bereits oben erläutert wurden.If the pump according to the invention is constructed with rotors with lubricated sliding bearings, then the continuity conditions, which have already been explained above, apply to the transition of the receptacles of product channel sections defined in the pump housing into bearing bodies 7 defined according to the invention.

Eine erfindungsgemässe Zahnradpumpe, insbesondere ausgebildet nach der bevorzugten Ausführungsvariante von Fig. 3, eignet sich ausgezeichnet für die Förderung von scherempfindlichen und/oder thermosensitiven Medien, insbesondere von Polymerschmelzen, wie z.B. von PVC, Kautschuk oder Biopolymeren. Sie ist aber auch für die Förderung von Lebensmitteln geeignet, bei welchen bezüglich Totraumfreiheit ähnlich hohe Anforderungen wie bei den genannten Schmelzen gelten.A gear pump according to the invention, in particular designed according to the preferred embodiment variant of FIG. 3, is excellently suitable for conveying shear-sensitive and / or thermosensitive media, in particular polymer melts, such as e.g. PVC, rubber or biopolymers. However, it is also suitable for the conveyance of foodstuffs in which the requirements regarding the absence of dead space are similar to those for the melts mentioned.

Claims (4)

Zahnradpumpe mit mindestens zwei in einem Produktekanal aussenverzahnt kämmenden Rotoren, dadurch gekennzeichnet, dass beidseits des Bereichs des Kämmens bezüglich einer die Rotorachsen verbindenden Ebene (EB) in der Produktekanalwandung (3) je eine volumenvergrössernde Einnehmung (5a₁, 5a₂, 5b₁, 5b₂) eingeformt ist.Gear pump with at least two in a products channel external gear teeth meshing rotors, characterized in that a plane including the rotor axis connecting (E B) in the Produktekanalwandung (3) formed per a volume-increasing Einnehmung (5a₁, 5a₂, 5b₁, 5b₂) with respect to both sides of the area of the combing is. Zahnradpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Einnehmungen durch stetig gekrümmte Flächen gebildet sind, vorzugsweise durch Kugelflächen, wobei nur druckseitig der Ebene (EB) eine Einnehmung vorgesehen zu werden braucht.Gear pump according to claim 1, characterized in that the recesses are formed by continuously curved surfaces, preferably by spherical surfaces, a recess only having to be provided on the pressure side of the plane (E B ). Zahnradpumpe nach einem der Ansprüche 1 oder 2, wobei die Rotoren in produktegeschmierten Gleitlagern gelagert sind, dadurch gekennzeichnet, dass die Einnehmung oder die Einnehmungen mindestens teilweise in den Teil der Produktekanalwandung bildenden Stirnflächen der Gleitlagerkörper geformt ist bzw. sind.Gear pump according to one of claims 1 or 2, wherein the rotors are mounted in product-lubricated slide bearings, characterized in that the recess or the recesses is or are at least partially shaped in the end faces of the slide bearing body forming part of the product channel wall. Verwendung einer Zahnradpumpe nach einem der Ansprüche 1 bis 3 für die Förderung von sehr empfindlichen und/oder thermosensitiven Medien, insbesondere von derartigen Lebensmitteln oder Polymerschmelzen, wie z.B. von PVC, Kautschuk oder von Biopolymeren.Use of a gear pump according to one of claims 1 to 3 for the conveyance of very sensitive and / or thermosensitive media, in particular of such foods or polymer melts, such as e.g. PVC, rubber or biopolymers.
EP94105347A 1994-04-07 1994-04-07 Gear pump Expired - Lifetime EP0677660B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES94105347T ES2087780T3 (en) 1994-04-07 1994-04-07 GEAR PUMP.
EP94105347A EP0677660B1 (en) 1994-04-07 1994-04-07 Gear pump
DK94105347.2T DK0677660T3 (en) 1994-04-07 1994-04-07 Gear pump and its use
DE59400284T DE59400284D1 (en) 1994-04-07 1994-04-07 Gear pump and its use
AT94105347T ATE138159T1 (en) 1994-04-07 1994-04-07 GEAR PUMP AND USE THEREOF
JP7081365A JPH07279861A (en) 1994-04-07 1995-04-06 Gear pump and usage of said gear pump
US08/417,853 US5547356A (en) 1994-04-07 1995-04-07 Gear pump and method of using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94105347A EP0677660B1 (en) 1994-04-07 1994-04-07 Gear pump

Publications (2)

Publication Number Publication Date
EP0677660A1 true EP0677660A1 (en) 1995-10-18
EP0677660B1 EP0677660B1 (en) 1996-05-15

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EP94105347A Expired - Lifetime EP0677660B1 (en) 1994-04-07 1994-04-07 Gear pump

Country Status (7)

Country Link
US (1) US5547356A (en)
EP (1) EP0677660B1 (en)
JP (1) JPH07279861A (en)
AT (1) ATE138159T1 (en)
DE (1) DE59400284D1 (en)
DK (1) DK0677660T3 (en)
ES (1) ES2087780T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5547356A (en) * 1994-04-07 1996-08-20 Maag Pump Systems Ag Gear pump and method of using same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1091225C (en) * 1998-10-01 2002-09-18 陶氏化学公司 Gear pump for pumping highly viscous fluids
US6213745B1 (en) 1999-05-03 2001-04-10 Dynisco High-pressure, self-lubricating journal bearings
US6179594B1 (en) 1999-05-03 2001-01-30 Dynisco, Inc. Air-cooled shaft seal
DE10135709C1 (en) * 2001-07-21 2003-02-13 Hartmut Hasse Universal lubricated sliding bearing for cogwheel pump has lubrication slot supplied with residual material in dead space of cog mechanism

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366152C (en) * 1922-12-30 Bbc Brown Boveri & Cie Device to avoid the squeezing effect in gear oil pumps
US3303792A (en) * 1964-04-20 1967-02-14 Roper Ind Inc Gear pump with trapping reliefs
EP0189670A1 (en) * 1985-01-05 1986-08-06 Maag Pump Systems AG Gear pumps
EP0455059A1 (en) * 1990-04-26 1991-11-06 FIATGEOTECH - TECNOLOGIE PER LA TERRA S.p.A. Gear pump
EP0559582A1 (en) * 1992-03-06 1993-09-08 Eastman Kodak Company Gear pump for high viscosity materials

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3113524A (en) * 1961-12-26 1963-12-10 Roper Hydraulics Inc Gear pump with trapping reliefs
DE2510496C3 (en) * 1975-03-11 1978-07-20 Robert Bosch Gmbh, 7000 Stuttgart Gear machine (pump or motor)
US4737087A (en) * 1984-12-10 1988-04-12 Barmag Ag Drive shaft seal for gear pump and method
DE59400284D1 (en) * 1994-04-07 1996-06-20 Maag Pump Systems Ag Gear pump and its use

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE366152C (en) * 1922-12-30 Bbc Brown Boveri & Cie Device to avoid the squeezing effect in gear oil pumps
US3303792A (en) * 1964-04-20 1967-02-14 Roper Ind Inc Gear pump with trapping reliefs
EP0189670A1 (en) * 1985-01-05 1986-08-06 Maag Pump Systems AG Gear pumps
EP0455059A1 (en) * 1990-04-26 1991-11-06 FIATGEOTECH - TECNOLOGIE PER LA TERRA S.p.A. Gear pump
EP0559582A1 (en) * 1992-03-06 1993-09-08 Eastman Kodak Company Gear pump for high viscosity materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5547356A (en) * 1994-04-07 1996-08-20 Maag Pump Systems Ag Gear pump and method of using same

Also Published As

Publication number Publication date
ES2087780T3 (en) 1996-07-16
DE59400284D1 (en) 1996-06-20
JPH07279861A (en) 1995-10-27
ATE138159T1 (en) 1996-06-15
EP0677660B1 (en) 1996-05-15
DK0677660T3 (en) 1996-06-03
US5547356A (en) 1996-08-20

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