EP1788245B1 - Pump unit - Google Patents

Pump unit Download PDF

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Publication number
EP1788245B1
EP1788245B1 EP20060017216 EP06017216A EP1788245B1 EP 1788245 B1 EP1788245 B1 EP 1788245B1 EP 20060017216 EP20060017216 EP 20060017216 EP 06017216 A EP06017216 A EP 06017216A EP 1788245 B1 EP1788245 B1 EP 1788245B1
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EP
European Patent Office
Prior art keywords
pump
pump unit
armature shaft
accordance
housing
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.)
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EP20060017216
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German (de)
French (fr)
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EP1788245A1 (en
Inventor
Dieter Jordan
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 H and L Hydraulic GmbH and Co KG
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Voith Turbo H and L Hydraulic GmbH and Co KG
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Publication of EP1788245A1 publication Critical patent/EP1788245A1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/001—Noise damping

Definitions

  • the invention relates to a pump unit, comprising an electric motor and at least one drivable by the armature shaft of the electric motor feed pump for conveying fluids, wherein the electric motor and the feed pump during operation of the fluid and / or flows through and are housed together in a housing.
  • a pump unit comprising an electric motor and at least one drivable by the armature shaft of the electric motor feed pump for conveying fluids, wherein the electric motor and the feed pump during operation of the fluid and / or flows through and are housed together in a housing.
  • hydraulic fluids are used as fluids; but other fluids are also conceivable according to the invention.
  • Such pump units as for example from the DE 10 2004 013 053 A1 are known, are used to supply in particular machine tools with fluids.
  • the Pump units should be as quiet as possible operable and have a simple and space-saving construction.
  • the closest prior art forming pump unit are provided for supporting the armature shaft of the electric motor in the housing of the pump unit bearing plates.
  • the present invention is based on the object, from the DE 10 2004 013 053 A1 Former previously known pump unit to the effect that it has a simplified structure with constant reliability.
  • the invention has the advantage that by providing the bearing bell, no bearing plates, as shown in the DE 10 2004 013 053 A1 are previously known, are required. Rather, the armature shaft is rotatably mounted on the pump housing via the bearing bell rotatably connected to the armature shaft. In this respect, there is a component savings and thus a simplified design of the pump unit and the elimination of a direct structure-borne sound transmission of the bearing plates on the housing or a housing part.
  • the bearing bell forms a sliding bearing pairing with the pump housing.
  • the provision of a plain bearing has the advantage that no rolling elements subject to wear are to be provided. In this respect, a permanent storage can be guaranteed.
  • An advantageous embodiment of the invention results when the inside of the bearing bell have a circular cylindrical bearing portion and the lateral surface of the housing of the feed pump cooperating with the bearing portion circular cylindrical abutment portion.
  • the bearing portion of the bearing bell and the abutment portion of the feed pump thus form the bearing pairing.
  • the bearing bell, or its bearing portion advantageously surrounds the pump housing, or its abutment portion.
  • the bearing section and the abutment section advantageously form a sliding bearing pairing.
  • the bearing bell advantageously has a shaft breakthrough for the armature shaft in the region of its central longitudinal axis.
  • the free end of the armature shaft advantageously passes through this shaft breakthrough.
  • the free end of the armature shaft can have a fastening thread on which a fastening nut can be screwed, by means of which the bearing bell on the armature shaft can be detachably arranged.
  • the bearing bell advantageously surrounds the free end of the armature shaft in the radial direction and / or projects beyond the free end of the armature shaft in the axial direction.
  • the free end of the armature shaft has a coupling portion for rotational coupling with the pump shaft of the feed pump.
  • the coupling portion is advantageously designed such that a releasable coupling of the two shafts is possible with each other.
  • a coupling takes place by mutual attachment of the two free shaft ends in the axial direction.
  • the free end of the pump shaft is then advantageously surrounded by the bearing bell in the radial direction.
  • a further embodiment of the invention results when the feed pump is arranged on the inside of a removable housing cover.
  • the feed pump is advantageously flanged to the side facing away from the pump shaft side to the housing cover, for example by means of fastening screws.
  • the housing cover is removed together with the feed pump, for example by axial removal of the housing cover together with the feed pump. Due to the detachable shaft connection, an axial separation of the pump shaft from the armature shaft is possible.
  • connections for a suction line and a pressure line of the feed pump and / or connections for the line for flowing around the feed pump and / or for flowing through the electric motor can be provided on the housing cover carrying the feed pump.
  • Such an arrangement has the advantage that all hydraulic connections on the housing cover can be realized.
  • the housing comprises a cylinder tube, wherein the stator of the electric motor is arranged on the inside of the cylinder tube.
  • the stator can be shrunk in the axial direction centered on the inside, glued, welded, screwed or be arranged.
  • the housing cover can be arranged either directly or indirectly, for example via an intermediate part, on the cylinder tube.
  • the housing cover may be secured to the housing by means of tie rods extending in the longitudinal direction of the cylinder tube.
  • a further, particularly advantageous embodiment of the invention is characterized in that the pump unit is designed as a double pump unit, wherein the armature shaft on both sides each drives a feed pump, wherein two bearing lugs are provided on the armature shaft, which cooperate in each case with the pump housing of the respective pump.
  • the bearing of the armature shaft thus takes place only via the bell bearings, which interact with the respective feed pump. Additional bearing elements for the rotatable mounting of the armature shaft in the housing advantageously omitted completely.
  • the pump unit according to the invention can be designed as a submersible pump for arrangement under the fluids, for example within a hydraulic fluid tank.
  • the pump unit may be formed according to the invention but also as a floor pump with a sealed outer casing.
  • the sealed outer housing is advantageously also formed as a cylindrical tube, which is preferably arranged coaxially to the then inner, the stator of the electric motor supporting the cylinder tube.
  • the housing cover, on which the delivery pump is then arranged advantageously closes both the inner tube carrying the stator and the sealed outer housing.
  • an inventive pump unit 10 which comprises an electric motor 12 and two drivable by the electric motor 12 feed pumps 14, 16 for conveying hydraulic fluid.
  • the Electric motor 12 has a stator 18 which is fixedly arranged on the inside of a cylindrical tubular housing part 20.
  • the rotor 22 of the electric motor comprises an armature shaft 24, the two free ends 26, 28 are each arranged with a pump shaft 30, 32 of the associated feed pump 14, 16 rotationally coupled.
  • the arrangement is such that the pump shafts 30, 32 in the axial direction with the free ends 26, 28 of the armature shaft are rotatably connected.
  • bearing balls 36 are rotatably disposed in the region of their free ends 26, 28 each axially outwardly facing.
  • the bearing blocks 36 each have a shaft opening 40 for the armature shaft 24 in the region of the central longitudinal axis 38.
  • the armature shaft and the bearing lugs have a groove keyway connection, with locknuts 42 acting on the respective bearing bell 36 against an associated shaft shoulder 44.
  • the armature shaft 24 is rotatably mounted on the pump housings of the feed pumps 16, 18.
  • the bearing lugs 36 point to their respective inner side a circular cylindrical bearing portion 46 which cooperates with a likewise circular cylindrical counter bearing portion 48 of the lateral surface of the respective feed pump 14, 16.
  • the bearing portion 46 and the abutment portion 48 forms a sliding bearing pairing.
  • the bearing balls 36 each surrounded their respective free end 26, 28 of the feed pumps 14, 16 in the radial direction and extend beyond the respective free ends of the armature shaft 24 also in the axial direction.
  • the feed pumps 14, 16 are arranged on the inside of removable housing covers 50, for example via fastening screws.
  • the central longitudinal axes of the feed pumps 14, 16 lie with the axis of rotation of the armature shaft 24 and the axis of rotation of the pump shafts 30, 32 on a line 38.
  • the housing part 20 is arranged concentrically around this central longitudinal axis 38.
  • the two housing cover 50 can over itself in the longitudinal direction extending tie rods 52 are clamped against the housing member 20.
  • intermediate elements 54 are provided between the housing component 20 and the housing covers 50.
  • the structure corresponds to the embodiment according to FIG. 1 in many parts the structure of the pump unit according to the figures of DE 10 2004 013 053 A1 .
  • connections for a suction line 58 and a pressure line 60 of the respective feed pump 14, 16 are arranged on the housing covers 50 not shown.
  • the suction lines 58 and the pressure lines 60 are indicated schematically by dotted lines in FIG FIG. 1 indicated.
  • the two housing covers 50 each have at least one connection 62 for a supply or discharge of hydraulic fluid, which is provided for flowing around the feed pumps 14, 16 and for flowing through the electric motor 12. This hydraulic fluid is in the FIG. 1 indicated by the reference numeral 56.
  • the hydraulic fluid which flows around the feed pumps 14, 16 and flows through the electric motor 12, is conveyed by at least one of the feed pumps 14, 16. Before this part of the hydraulic fluid flows back into the pump unit, a cooling of the hydraulic fluid can take place.
  • the housing part 20 is in the FIG. 1 surrounded by a cylinder tube 64 and forms a sealed outer casing of the pump unit 10.
  • the pump unit 10 according to FIG. 1 is designed as a floor pump unit.
  • the pump unit 70 according to the FIG. 2 corresponds essentially to the pump unit 10 according to FIG. 1 , wherein corresponding components are identified by corresponding reference numerals.
  • the main difference of the pump unit 70 to the pump unit 10 is that no tight outer housing in the form of the cylinder tube 64 is provided here.
  • This pump unit is designed as a submersible pump, which is arranged on a frame 72.
  • the entire pump unit 70 can be sunk, for example, in a hydraulic fluid reservoir.
  • Hydraulic fluid can enter into the component 20 and thus into the electric motor 12 via the recess 74.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Die Erfindung betrifft ein Pumpenaggregat, umfassend einen Elektromotor und wenigstens eine von der Ankerwelle des Elektromotors antreibbare Förderpumpe zum Fördern von Fluiden, wobei der Elektromotor und die Förderpumpe bei Betrieb vom Fluid um- und/oder durchströmt werden und gemeinsam in einem Gehäuse untergebracht sind. Als Fluide kommen insbesondere Hydraulikflüssigkeiten zum Einsatz; andere Fluide sind aber erfindungsgemäß auch denkbar.The invention relates to a pump unit, comprising an electric motor and at least one drivable by the armature shaft of the electric motor feed pump for conveying fluids, wherein the electric motor and the feed pump during operation of the fluid and / or flows through and are housed together in a housing. In particular hydraulic fluids are used as fluids; but other fluids are also conceivable according to the invention.

Derartige Pumpenaggregate, wie sie beispielsweise aus der DE 10 2004 013 053 A1 bekannt sind, dienen zur Versorgung von insbesondere Werkzeugmaschinen mit Fluiden. Die Pumpenaggregate sollen dabei möglichst geräuscharm betreibbar sein und einen einfachen und Bauraum sparenden Aufbau aufweisen. Bei dem aus der DE 10 2004 013 053 A1 vorbekannten, den nächstliegenden Stand der Technik bildenden Pumpenaggregat sind zur Lagerung der Ankerwelle des Elektromotors im Gehäuse des Pumpenaggregats Lagerschilder vorgesehen.Such pump units, as for example from the DE 10 2004 013 053 A1 are known, are used to supply in particular machine tools with fluids. The Pump units should be as quiet as possible operable and have a simple and space-saving construction. In the from the DE 10 2004 013 053 A1 Prior art, the closest prior art forming pump unit are provided for supporting the armature shaft of the electric motor in the housing of the pump unit bearing plates.

Aus den JP 2003-021038 A und der DE 10 2004 008 158 A1 sind weitere, zum Stand der Technik gehörende Pumpenaggregate bekannt geworden.From the JP 2003-021038 A and the DE 10 2004 008 158 A1 Further, belonging to the prior art pump units have become known.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein aus der DE 10 2004 013 053 A1 vorbekanntes Pumpenaggregat dahingehend weiterzubilden, dass es bei gleichbleibender Betriebssicherheit einen vereinfachten Aufbau aufweist.The present invention is based on the object, from the DE 10 2004 013 053 A1 Former previously known pump unit to the effect that it has a simplified structure with constant reliability.

Diese Aufgabe wird mit einem Pumpenaggregat mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with a pump unit having the features of claim 1.

Die Erfindung hat den Vorteil, dass durch Vorsehen der Lagerglocke, keine Lagerschilder, wie sie aus der DE 10 2004 013 053 A1 vorbekannt sind, erforderlich sind. Die Ankerwelle wird vielmehr über die drehfest mit der Ankerwelle verbundene Lagerglocke am Pumpengehäuse drehbar gelagert. Insofern erfolgt eine Bauteileinsparung und damit ein vereinfachter Aufbau des Pumpenaggregats sowie der Wegfall einer direkten Körperschallübertragung der Lagerschilder auf das Gehäuse oder eines Gehäuseteils.The invention has the advantage that by providing the bearing bell, no bearing plates, as shown in the DE 10 2004 013 053 A1 are previously known, are required. Rather, the armature shaft is rotatably mounted on the pump housing via the bearing bell rotatably connected to the armature shaft. In this respect, there is a component savings and thus a simplified design of the pump unit and the elimination of a direct structure-borne sound transmission of the bearing plates on the housing or a housing part.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung kann vorgesehen sein, dass die Lagerglocke mit dem Pumpengehäuse eine Gleitlagerpaarung bildet. Das Vorsehen eines Gleitlagers hat den Vorteil, dass keine einem Verschleiß unterliegenden Wälzkörper vorzusehen sind. Insofern kann eine dauerhafte Lagerung gewährleistet werden.According to an advantageous embodiment of the invention can be provided that the bearing bell forms a sliding bearing pairing with the pump housing. The provision of a plain bearing has the advantage that no rolling elements subject to wear are to be provided. In this respect, a permanent storage can be guaranteed.

Eine vorteilhafte Ausgestaltung der Erfindung ergibt sich dann, wenn die Innenseite der Lagerglocke einen kreiszylindrischen Lagerabschnitt und die Mantelfläche des Gehäuses der Förderpumpe einen mit dem Lagerabschnitt zusammenwirkenden kreiszylindrischen Gegenlagerabschnitt aufweisen. Der Lagerabschnitt der Lagerglocke und der Gegenlagerabschnitt der Förderpumpe bilden folglich die Lagerpaarung. Bei einer derartigen Ausgestaltung der Erfindung umgibt die Lagerglocke, beziehungsweise deren Lagerabschnitt vorteilhafterweise das Pumpengehäuse, beziehungsweise dessen Gegenlagerabschnitt. Wie bereits erwähnt, bilden der Lagerabschnitt und der Gegenlagerabschnitt vorteilhafterweise eine Gleitlagerpaarung. Dennoch kann erfindungsgemäß vorgesehen sein, dass Wälzkörper, beispielsweise Kugeln oder Trommeln, zur drehbaren Lagerung der Lagerglocke bezüglich des drehfest angeordneten Pumpengehäuses vorgesehen sind.An advantageous embodiment of the invention results when the inside of the bearing bell have a circular cylindrical bearing portion and the lateral surface of the housing of the feed pump cooperating with the bearing portion circular cylindrical abutment portion. The bearing portion of the bearing bell and the abutment portion of the feed pump thus form the bearing pairing. In such an embodiment of the invention, the bearing bell, or its bearing portion advantageously surrounds the pump housing, or its abutment portion. As already mentioned, the bearing section and the abutment section advantageously form a sliding bearing pairing. Nevertheless, it can be provided according to the invention that rolling elements, for example balls or drums, are provided for rotatably supporting the bearing bell with respect to the rotationally fixed pump housing.

Die Lagerglocke weist dabei vorteilhafterweise im Bereich ihrer Mittellängsachse einen Wellendurchbruch für die Ankerwelle auf. Das freie Ende der Ankerwelle durchgreift vorteilhafterweise diesen Wellendurchbruch. Das freie Ende der Ankerwelle kann dabei ein Befestigungsgewinde aufweisen, auf das eine Befestigungsmutter aufschraubbar sein kann, mittels welcher die Lagerglocke an der Ankerwelle lösbar angeordnet werden kann. Die Lagerglocke umgibt dabei vorteilhafterweise das freie Ende der Ankerwelle in radialer Richtung und/oder überragt das freie Ende der Ankerwelle in axialer Richtung.The bearing bell advantageously has a shaft breakthrough for the armature shaft in the region of its central longitudinal axis. The free end of the armature shaft advantageously passes through this shaft breakthrough. The free end of the armature shaft can have a fastening thread on which a fastening nut can be screwed, by means of which the bearing bell on the armature shaft can be detachably arranged. The bearing bell advantageously surrounds the free end of the armature shaft in the radial direction and / or projects beyond the free end of the armature shaft in the axial direction.

Ferner kann erfindungsgemäß vorgesehen sein, dass das freie Ende der Ankerwelle einen Kopplungsabschnitt zur Drehkopplung mit der Pumpenwelle der Förderpumpe aufweist. Der Kopplungsabschnitt ist dabei vorteilhafterweise derart ausgebildet, dass ein lösbares Koppeln der beiden Wellen miteinander möglich ist. Vorteilhafterweise findet eine Kopplung durch gegenseitiges Aufstecken der beiden freien Wellenenden in axialer Richtung statt. Bei einer derartigen Ausführungsform ist vorteilhafterweise dann auch das freie Ende der Pumpenwelle in radialer Richtung von der Lagerglocke umgeben.Furthermore, it can be provided according to the invention that the free end of the armature shaft has a coupling portion for rotational coupling with the pump shaft of the feed pump. The coupling portion is advantageously designed such that a releasable coupling of the two shafts is possible with each other. Advantageously, a coupling takes place by mutual attachment of the two free shaft ends in the axial direction. In such an embodiment, the free end of the pump shaft is then advantageously surrounded by the bearing bell in the radial direction.

Eine weitere Ausbildung der Erfindung ergibt sich dann, wenn die Förderpumpe an der Innenseite eines abnehmbaren Gehäusedeckels angeordnet ist. Die Förderpumpe ist dabei vorteilhafterweise an der ihrer Pumpenwelle abgewandten Seite an den Gehäusedeckel angeflanscht, beispielsweise mittels Befestigungsschrauben. Vorteilhafterweise wird der Gehäusedeckel zusammen mit der Förderpumpe abgenommen, beispielsweise durch axiales Entfernen des Gehäusedeckels samt Förderpumpe. Aufgrund der lösbaren Wellenverbindung ist ein axiales Trennen der Pumpenwelle von der Ankerwelle möglich.A further embodiment of the invention results when the feed pump is arranged on the inside of a removable housing cover. The feed pump is advantageously flanged to the side facing away from the pump shaft side to the housing cover, for example by means of fastening screws. Advantageously, the housing cover is removed together with the feed pump, for example by axial removal of the housing cover together with the feed pump. Due to the detachable shaft connection, an axial separation of the pump shaft from the armature shaft is possible.

An dem die Förderpumpe tragenden Gehäusedeckel können insbesondere Anschlüsse für eine Saugleitung und eine Druckleitung der Förderpumpe und/oder Anschlüsse für die Leitung zum Umströmen der Förderpumpe und/oder zum Durchströmen des Elektromotors vorgesehen sein. Eine derartige Anordnung hat den Vorteil, dass sämtliche Hydraulikanschlüsse am Gehäusedeckel realisierbar sind.In particular, connections for a suction line and a pressure line of the feed pump and / or connections for the line for flowing around the feed pump and / or for flowing through the electric motor can be provided on the housing cover carrying the feed pump. Such an arrangement has the advantage that all hydraulic connections on the housing cover can be realized.

Vorteilhafterweise umfasst das Gehäuse ein Zylinderrohr, wobei der Stator des Elektromotors an der Innenseite des Zylinderrohrs angeordnet ist. Der Stator kann dabei beispielsweise in axialer Richtung mittig an der Innenseite aufgeschrumpft, angeklebt, angeschweißt, angeschraubt oder dergleichen angeordnet sein. Bei Vorsehen eines Gehäusedeckels kann der Gehäusedeckel entweder direkt oder indirekt, beispielsweise über ein Zwischenteil, am Zylinderrohr angeordnet sein. Insbesondere kann der Gehäusedeckel mittels sich in Längsrichtung des Zylinderrohrs erstreckenden Zugankern am Gehäuse befestigt sein.Advantageously, the housing comprises a cylinder tube, wherein the stator of the electric motor is arranged on the inside of the cylinder tube. The stator can be shrunk in the axial direction centered on the inside, glued, welded, screwed or be arranged. When providing a housing cover, the housing cover can be arranged either directly or indirectly, for example via an intermediate part, on the cylinder tube. In particular, the housing cover may be secured to the housing by means of tie rods extending in the longitudinal direction of the cylinder tube.

Eine weitere, besonders vorteilhafte Ausgestaltung der Erfindung zeichnet sich dadurch aus, dass das Pumpenaggregat als Doppelpumpenaggregat ausgebildet ist, bei dem die Ankerwelle beidseitig jeweils eine Förderpumpe antreibt, wobei an der Ankerwelle zwei Lagerglocken vorgesehen sind, die jeweils mit dem Pumpengehäuse der jeweiligen Pumpe zusammenwirken. Die Lagerung der Ankerwelle erfolgt also lediglich über die Glockenlager, die mit der jeweiligen Förderpumpe zusammenwirken. Zusätzliche Lagerelemente zur drehbaren Lagerung der Ankerwelle im Gehäuse entfallen dabei vorteilhafterweise komplett.A further, particularly advantageous embodiment of the invention is characterized in that the pump unit is designed as a double pump unit, wherein the armature shaft on both sides each drives a feed pump, wherein two bearing lugs are provided on the armature shaft, which cooperate in each case with the pump housing of the respective pump. The bearing of the armature shaft thus takes place only via the bell bearings, which interact with the respective feed pump. Additional bearing elements for the rotatable mounting of the armature shaft in the housing advantageously omitted completely.

Das Pumpenaggregat kann gemäß der Erfindung als Tauchpumpe zur Anordnung unter dem Fluiden, beispielsweise innerhalb eines Hydraulikflüssigkeitstanks, ausgebildet sein. Das Pumpenaggregat kann gemäß der Erfindung aber auch als Standpumpe mit einem dichten Außengehäuse ausgebildet sein.The pump unit according to the invention can be designed as a submersible pump for arrangement under the fluids, for example within a hydraulic fluid tank. The pump unit may be formed according to the invention but also as a floor pump with a sealed outer casing.

Das dichte Außengehäuse ist dabei vorteilhafterweise ebenfalls als Zylinderrohr ausgebildet, das vorzugsweise koaxial zu dem dann inneren, den Stator des Elektromotors tragenden Zylinderrohr, angeordnet ist. Bei einer derartigen Ausbildung verschließt der Gehäusedeckel, an dem dann die Förderpumpe angeordnet ist, vorteilhafterweise sowohl das den Stator tragende Innenrohr sowie das dichte Außengehäuse.The sealed outer housing is advantageously also formed as a cylindrical tube, which is preferably arranged coaxially to the then inner, the stator of the electric motor supporting the cylinder tube. With such a design, the housing cover, on which the delivery pump is then arranged, advantageously closes both the inner tube carrying the stator and the sealed outer housing.

Weitere Einzelheiten und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung zu entnehmen, anhand derer die in der Zeichnung dargestellten Ausführungsbeispiele näher beschrieben und erläutert sind.Further details and advantageous embodiments of the invention will become apparent from the following description, with reference to which the embodiments illustrated in the drawings are described and explained in more detail.

Es zeigen:

Figur 1
einen Längsschnitt durch eine erste Ausführungsform der Erfindung; und
Figur 2
einen Längsschnitt durch eine zweite Ausführungsform der Erfindung.
Show it:
FIG. 1
a longitudinal section through a first embodiment of the invention; and
FIG. 2
a longitudinal section through a second embodiment of the invention.

In der Figur 1 ist ein erfindungsgemäßes Pumpenaggregat 10 dargestellt, das einen Elektromotor 12 und zwei durch den Elektromotor 12 antreibbare Förderpumpen 14, 16 zur Förderung von Hydraulikflüssigkeit umfasst. Der Elektromotor 12 weist einen Stator 18 auf, der an der Innenseite eines zylinderrohrförmigen Gehäuseteils 20 fest angeordnet ist. Der Rotor 22 des Elektromotors umfasst eine Ankerwelle 24, deren beiden freien Enden 26, 28 jeweils mit einer Pumpenwelle 30, 32 der zugehörigen Förderpumpe 14, 16 drehgekoppelt angeordnet sind. Die Anordnung ist dabei derart, dass die Pumpenwellen 30, 32 in axialer Richtung mit den freien Enden 26, 28 der Ankerwelle drehfest verbindbar sind. Dazu sind in der Figur 1 Verbindungselemente 34 vorgesehen.In the FIG. 1 an inventive pump unit 10 is shown, which comprises an electric motor 12 and two drivable by the electric motor 12 feed pumps 14, 16 for conveying hydraulic fluid. Of the Electric motor 12 has a stator 18 which is fixedly arranged on the inside of a cylindrical tubular housing part 20. The rotor 22 of the electric motor comprises an armature shaft 24, the two free ends 26, 28 are each arranged with a pump shaft 30, 32 of the associated feed pump 14, 16 rotationally coupled. The arrangement is such that the pump shafts 30, 32 in the axial direction with the free ends 26, 28 of the armature shaft are rotatably connected. These are in the FIG. 1 Connecting elements 34 are provided.

An der Ankerwelle 24 sind im Bereich ihrer freien Enden 26, 28 jeweils nach axial außen weisend Lagerglocken 36 drehfest angeordnet. Die Lagerglocken 36 weisen im Bereich der Mittellängsachse 38 jeweils einen Wellendurchbruch 40 für die Ankerwelle 24 auf. Zur drehsicheren Anordnung der Lagerglocken 36 weisen Ankerwelle und Lagerglocken ein Nut-Passfederverbindung auf, wobei Sicherungsmuttern 42 die jeweilige Lagerglocke 36 gegen eine zugehörige Wellenschulter 44 beaufschlagen. Hierdurch wird eine drehsichere und lösbare Verbindung zwischen den Lagerglocken 36 und der Ankerwelle 24 realisiert.At the armature shaft 24 bearing balls 36 are rotatably disposed in the region of their free ends 26, 28 each axially outwardly facing. The bearing blocks 36 each have a shaft opening 40 for the armature shaft 24 in the region of the central longitudinal axis 38. For the rotationally secure arrangement of the bearing lugs 36, the armature shaft and the bearing lugs have a groove keyway connection, with locknuts 42 acting on the respective bearing bell 36 against an associated shaft shoulder 44. As a result, a rotationally secure and releasable connection between the bearing caps 36 and the armature shaft 24 is realized.

Über die Lagerglocken 36 wird die Ankerwelle 24 an den Pumpengehäusen der Förderpumpen 16, 18 drehgelagert. Die Lagerglocken 36 weisen dabei an ihrer jeweiligen Innenseite einen kreiszylindrischen Lagerabschnitt 46 auf, der mit einem ebenfalls kreiszylindrisch ausgebildeten Gegenlagerabschnitt 48 der Mantelfläche der jeweiligen Förderpumpe 14, 16 zusammenwirkt. Bei dem in der Figur 1 dargestellten Pumpenaggregat 10 bildet der Lagerabschnitt 46 und der Gegenlagerabschnitt 48 eine Gleitlagerpaarung. Durch Vorsehen der Lagerglocken 36 und durch entsprechende Ausbildung der Pumpengehäuse der Förderpumpen 14, 16 entfallen zusätzliche Lagerteile. Einhergeht ein einfacherer und damit kostengünstigerer Aufbau des Pumpenaggregats.About the bearing caps 36, the armature shaft 24 is rotatably mounted on the pump housings of the feed pumps 16, 18. The bearing lugs 36 point to their respective inner side a circular cylindrical bearing portion 46 which cooperates with a likewise circular cylindrical counter bearing portion 48 of the lateral surface of the respective feed pump 14, 16. In the in the FIG. 1 illustrated pump unit 10, the bearing portion 46 and the abutment portion 48 forms a sliding bearing pairing. By providing the bearing caps 36 and by appropriate design of the pump housing of the feed pumps 14, 16 accounts for additional bearing parts. This results in a simpler and thus cheaper construction of the pump set.

Wie aus der Figur 1 deutlich wird, umgeben die Lagerglocken 36 das jeweils ihnen zugehörige freie Ende 26, 28 der Förderpumpen 14, 16 in radialer Richtung und überragen die jeweiligen freien Enden der Ankerwelle 24 zudem in axialer Richtung.Like from the FIG. 1 becomes clear, the bearing balls 36 each surrounded their respective free end 26, 28 of the feed pumps 14, 16 in the radial direction and extend beyond the respective free ends of the armature shaft 24 also in the axial direction.

Die Förderpumpen 14, 16 sind dabei an der Innenseite von abnehmbaren Gehäusedeckeln 50, beispielsweise über Befestigungsschrauben, angeordnet. Die Mittellängsachsen der Förderpumpen 14, 16 liegen mit der Drehachse der Ankerwelle 24 sowie der Drehachse der Pumpwellen 30, 32 auf einer Linie 38. Auch das Gehäuseteil 20 ist konzentrisch um diese Mittellängsachse 38 angeordnet. Die beiden Gehäusedeckel 50 können über sich in Längsrichtung erstreckende Zuganker 52 gegen das Gehäusebauteil 20 verspannt werden. Zwischen dem Gehäusebauteil 20 und den Gehäusedeckeln 50 sind allerdings Zwischenelemente 54 vorgesehen.The feed pumps 14, 16 are arranged on the inside of removable housing covers 50, for example via fastening screws. The central longitudinal axes of the feed pumps 14, 16 lie with the axis of rotation of the armature shaft 24 and the axis of rotation of the pump shafts 30, 32 on a line 38. The housing part 20 is arranged concentrically around this central longitudinal axis 38. The two housing cover 50 can over itself in the longitudinal direction extending tie rods 52 are clamped against the housing member 20. However, intermediate elements 54 are provided between the housing component 20 and the housing covers 50.

Insgesamt entspricht der Aufbau der Ausführungsform gemäß Figur 1 in weiten Teilen dem Aufbau des Pumpenaggregats gemäß den Figuren der DE 10 2004 013 053 A1 . An den Gehäusedeckeln 50 sind nicht dargestellte Anschlüsse für eine Saugleitung 58 und eine Druckleitung 60 der jeweiligen Förderpumpe 14, 16 angeordnet. Die Saugleitungen 58 und die Druckleitungen 60 sind schematisch durch strichpunktierte Linien in der Figur 1 angedeutet. Ferner weisen die beiden Gehäusedeckel 50 jeweils wenigstens einen Anschluss 62 für eine Zu- beziehungsweise Ableitung von Hydraulikflüssigkeit auf, die zum Umströmen der Förderpumpen 14, 16 und zum Durchströmen des Elektromotors 12 vorgesehen ist. Diese Hydraulikflüssigkeit ist in der Figur 1 mit dem Bezugszeichen 56 angedeutet.Overall, the structure corresponds to the embodiment according to FIG. 1 in many parts the structure of the pump unit according to the figures of DE 10 2004 013 053 A1 , On the housing covers 50 not shown connections for a suction line 58 and a pressure line 60 of the respective feed pump 14, 16 are arranged. The suction lines 58 and the pressure lines 60 are indicated schematically by dotted lines in FIG FIG. 1 indicated. Furthermore, the two housing covers 50 each have at least one connection 62 for a supply or discharge of hydraulic fluid, which is provided for flowing around the feed pumps 14, 16 and for flowing through the electric motor 12. This hydraulic fluid is in the FIG. 1 indicated by the reference numeral 56.

Die Hydraulikflüssigkeit, die die Förderpumpen 14, 16 umströmt und den Elektromotor 12 durchströmt, wird von wenigstens einer der Förderpumpen 14, 16 gefördert. Bevor dieser Teil der Hydraulikflüssigkeit in das Pumpenaggregat zurückfließt, kann eine Kühlung der Hydraulikflüssigkeit stattfinden.The hydraulic fluid, which flows around the feed pumps 14, 16 and flows through the electric motor 12, is conveyed by at least one of the feed pumps 14, 16. Before this part of the hydraulic fluid flows back into the pump unit, a cooling of the hydraulic fluid can take place.

Das Gehäuseteil 20 wird in der Figur 1 von einem Zylinderrohr 64 umgeben und bildet ein dichtes Außengehäuse des Pumpenaggregats 10. Das Pumpenaggregat 10 gemäß Figur 1 ist als Standpumpenaggregat ausgebildet.The housing part 20 is in the FIG. 1 surrounded by a cylinder tube 64 and forms a sealed outer casing of the pump unit 10. The pump unit 10 according to FIG. 1 is designed as a floor pump unit.

Das Pumpenaggregat 70 gemäß der Figur 2 entspricht im Wesentlichen dem Pumpenaggregat 10 gemäß Figur 1, wobei entsprechende Bauteile mit entsprechenden Bezugszeichen gekennzeichnet sind. Hauptunterschied des Pumpenaggregats 70 zum Pumpenaggregat 10 ist, dass hier kein dichtes Außengehäuse in Form des Zylinderrohrs 64 vorgesehen ist. Dieses Pumpenaggregat ist als Tauchpumpe ausgebildet, die an einem Rahmen 72 angeordnet ist. Das gesamte Pumpenaggregat 70 kann beispielsweise in einem Hydraulikflüssigkeitsbehälter versenkt werden. Bei der Ausführungsform gemäß Figur 2 entfallen deshalb an den Deckelteilen 50 Anschlüsse für die Zu- und Abführung der das Pumpenaggregat 70 durchströmenden Hydraulikflüssigkeit. Über die Aussparung 74 kann Hydraulikflüssigkeit in das Bauteil 20 und damit in den Elektromotor 12 gelangen.The pump unit 70 according to the FIG. 2 corresponds essentially to the pump unit 10 according to FIG. 1 , wherein corresponding components are identified by corresponding reference numerals. The main difference of the pump unit 70 to the pump unit 10 is that no tight outer housing in the form of the cylinder tube 64 is provided here. This pump unit is designed as a submersible pump, which is arranged on a frame 72. The entire pump unit 70 can be sunk, for example, in a hydraulic fluid reservoir. In the embodiment according to FIG. 2 Therefore accounts for the cover parts 50 connections for the supply and discharge of the pump unit 70 by flowing hydraulic fluid. Hydraulic fluid can enter into the component 20 and thus into the electric motor 12 via the recess 74.

Claims (10)

  1. A pump unit (10, 70), comprising an electric motor (12) with an armature shaft (24) and at least one feed pump (14, 16), which can be driven by the armature shaft (24) of the electric motor (12), for conveying hydraulic fluid, wherein during the operation of the pump unit (10, 70) hydraulic fluid flows around and/or through the electric motor (12), and hydraulic fluid flows around and/or through the feed pump (14, 16), and they are together placed in a housing, characterized in that at least one bell-shaped bearing (36) is attached, fixed against relative rotation, on the armature shaft (24), and works together with the pump housing of the feed pump (14, 16) for seating the armature shaft (24).
  2. The pump unit (10, 70) in accordance with claim 1, characterized in that, together with the pump housing of the feed pump (114, 16), the bell-shaped bearing (36) constitutes a sliding bearing pairing.
  3. The pump unit (10, 70) in accordance with claim 1 or 2, characterized in that the inside of the bell-shaped bearing has a circular-cylindrical bearing section (46), and the shell face has a circular-cylindrical counterbearing section (48), which works together with the bearing section (46).
  4. The pump unit (10, 70) in accordance with claim 1, 2 or 3, characterized in that the bell-shaped bearing (36) has a shaft opening (40) for the armature shaft (24), wherein the bell-shaped bearing (36) encloses the free end (26, 28) of the armature shaft (24) in the radial direction and/or projects past the free end (26, 28) of the armature shaft (24) in the axial direction.
  5. The pump unit (10, 70) in accordance with one of the preceding claims, characterized in that the free end (26, 28) of the armature shaft (24) has a coupling section for rotary coupling with a pump shaft (30, 32) of the feed pump (14, 16).
  6. The pump unit (10, 70) in accordance with one of the preceding claims, characterized in that the feed pump (14, 16) is arranged on the inside of a removable housing cover (50).
  7. The pump unit (10, 70) in accordance with claim 6, characterized in that connectors for a suction line (58) and a pressure line (60) of the feed pump (14, 16), and/or connectors for the line for a flow around the feed pumps (14, 16), and/or the flow through the electric motor (12), are provided on the housing cover (50).
  8. The pump unit (10, 70) in accordance with one of the preceding claims, characterized in that the housing comprises a cylinder tube (20), wherein the stator (18) of the electric motor (12) is arranged on the inside of the cylinder tube (20).
  9. The pump unit (10, 70) in accordance with one of the preceding claims, characterized in that the pump unit (10, 70) is designed as a double pump unit, in which the armature shaft (24) respectively drives a feed pump (14, 16) at each end, wherein two bell-shaped bearings (36) are provided on the armature shaft (24), each of which works together with the respective feed pump (14, 16).
  10. The pump unit (10, 70) in accordance with one of the preceding claims, characterized in that the pump unit is designed as an immersion pump (70) for arrangement in a hydraulic fluid, or as an upright pump (10) with a sealed exterior housing (64).
EP20060017216 2005-11-17 2006-08-18 Pump unit Active EP1788245B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005055824A DE102005055824B3 (en) 2005-11-17 2005-11-17 Pump unit for supplying hydraulic fluid to machine tools, has bearing bell arranged in armature shaft of electric motor in torque proof manner and cooperating with housing of feed pumps to store shaft and to form sliding bearing pairing

Publications (2)

Publication Number Publication Date
EP1788245A1 EP1788245A1 (en) 2007-05-23
EP1788245B1 true EP1788245B1 (en) 2008-06-04

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ID=37085304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060017216 Active EP1788245B1 (en) 2005-11-17 2006-08-18 Pump unit

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EP (1) EP1788245B1 (en)
DE (2) DE102005055824B3 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3336632B2 (en) * 1992-07-03 2002-10-21 三菱電機株式会社 Two-cylinder hermetic electric compressor, assembling jig and assembling method
DE19633169A1 (en) * 1996-08-17 1998-02-19 Teves Gmbh Alfred Electric motor / pump unit
JPH11351175A (en) * 1998-06-08 1999-12-21 Denso Corp Electric compressor
JP2003021038A (en) * 2001-07-05 2003-01-24 Nidec Shibaura Corp Hydraulic power generator
DE60302769T2 (en) * 2002-02-28 2006-08-10 Standex International Corp. MOTOR PUMP
DE102004008158A1 (en) * 2004-02-12 2005-09-22 Laing, Oliver Spherical bearing, electric motor and circulation pump
DE102004013053B4 (en) * 2004-03-10 2006-07-27 Voith Turbo H + L Hydraulic Gmbh & Co. Kg pump unit

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DE102005055824B3 (en) 2006-11-02
EP1788245A1 (en) 2007-05-23
DE502006000875D1 (en) 2008-07-17

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