EP0081659A1 - Pump unit driven by an electric motor - Google Patents

Pump unit driven by an electric motor Download PDF

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Publication number
EP0081659A1
EP0081659A1 EP82109766A EP82109766A EP0081659A1 EP 0081659 A1 EP0081659 A1 EP 0081659A1 EP 82109766 A EP82109766 A EP 82109766A EP 82109766 A EP82109766 A EP 82109766A EP 0081659 A1 EP0081659 A1 EP 0081659A1
Authority
EP
European Patent Office
Prior art keywords
electric motor
pump unit
unit according
interior
pump
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
EP82109766A
Other languages
German (de)
French (fr)
Other versions
EP0081659B1 (en
Inventor
Achill Kessler
Helmut Dipl.-Ing. Rembold
Manfred Ruoff
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0081659A1 publication Critical patent/EP0081659A1/en
Application granted granted Critical
Publication of EP0081659B1 publication Critical patent/EP0081659B1/en
Expired 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • 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 is based on a pump unit according to the preamble of the main claim.
  • a pump unit of this type is already known, in which the medium channels for the removal of the pressure medium run in two connecting pieces arranged on the outside of the pump housing.
  • a gaseous pressure medium such as air
  • the flow noises occurring during operation, but also the motor noises are perceived as very disruptive.
  • the known pump unit is fastened in a motor vehicle and is to be used to actuate a central locking system, for example.
  • the airborne and structure-borne noise generated by the pumping unit are introduced without damping into the body of the motor vehicle, which even serves as a soundboard.
  • the unit according to the invention with the characterizing features of the main claim has the advantage over the that the flow noise of the pump unit can be reduced without great effort if the cavities of the pump unit that are necessary anyway are used as sound-absorbing chambers.
  • the closed interior of the adapter in particular limited by the housings on the one hand of the vane pump and on the other hand of the electric motor, is connected to the interior of the housing of the electric motor via at least one through opening, in particular a throttle point.
  • the first-mentioned "silencing chamber” is followed by a second “silencing chamber”, which is present anyway and must be flowed through by the pressure medium during operation of the pump unit.
  • the flow noise mentioned at the outset is attenuated even further without having to drive an apparatus expenditure which increases the weight or the volume of the pump unit.
  • FIG. 1 shows a longitudinal section through an electric motor-driven pump unit
  • FIG. 2 shows a cross section along II-II in FIG. 1
  • FIG. 3 shows a partially sectioned top view according to III-III in FIG. 1.
  • a pump unit which consists essentially of a vane pump 1 and an electric motor 2.
  • the actual vane pump consists of a lifting ring 3, in which a cylindrical housing recess 4 is arranged eccentrically.
  • the housing recess 4 is axially delimited by two side plates 5, 6, the outer diameter of which corresponds to the outer diameter of the cam ring 3.
  • the cam ring 3 and side plates 5, 6 are secured against displacement by pins 7 with one another.
  • a rotor 8 concentric with the outer contour of the vane pump, in the radially arranged slots 9 of which vanes 10 are tightly and slidably guided.
  • the outer edges of the blades 10 touch the cylindrical inner wall of the housing recess 4 and divide the approximately sickle-shaped working space formed between the outer surface of the rotor 8 and the wall of the housing recess 4 into individual cells.
  • the rotor is guided on a pump shaft 11, which in turn is held in bearing bores arranged concentrically in the side plates 5, 6.
  • the vane cell pump which is delimited axially by the side plates 5, 6, is covered from above with a protective cover 13 and screwed onto a flange 14 of an essentially cylindrical adapter part 15 by means of three countersunk screws 12.
  • the adapter part 15 is essentially tubular and has a flat end wall 16 near its end facing away from the flange 14.
  • the end wall 16 is seated flat on a end plate-like end cover 17 of the electric motor 2 and is fastened there by means of cylinder head screws 18.
  • the adapter part is adjusted by the part of its cylindrical wall that is on the vane pump 1 the opposite side protrudes beyond the end wall 16 and abuts the cylindrical outer surface of the housing of the electric motor 2.
  • the cam ring 3 and the side plates 5, 6 are made of plastic, while the protective cover 13 and the adapter part 15 can be made of aluminum. Of course, these parts can also be made of plastic.
  • the cells divided by the vanes 10 change their size in the interior 4.
  • medium channels 22, 23 (FIG. 2) are shown in a manner known per se - and therefore only indicated by dash-dotted lines in the drawing. arranged for supply and discharge of the print medium.
  • the medium channel 22 opens - as indicated in FIGS. 1 and 3 - into the interior 19 of the adapter part 15.
  • the other medium channel 23 is covered by a projection 25 radially inward in the plane of the flange 14.
  • the projection 25 in turn carries a connecting piece 26 in which the other medium channel 23 continues. As can be seen in FIG. 3, the connecting piece 26 pierces the cylindrical wall of the adapter part 15 to the outside.
  • the closed interior 19 of the adapter part 15 is via a through opening 24, the flow cross section of which is approximately the same as that of the medium channel 22, connected to the interior of the housing of the electric motor 2, which is not known in the drawing - because it is known per se.
  • the passage opening 24 can also be designed as a throttle point in special exemplary embodiments.
  • the through opening 24 is provided on the side facing the electric motor 2 with an extension 27, which is covered by a filter plate 28, which is preferably designed as a wire mesh.
  • the interior of the electric motor 2 is connected to the outside of the electric motor via at least one opening 29 arranged in its housing wall, which is arranged in an area facing away from the end cover 17.
  • the breakthrough can also not be covered with an open-pore foam layer, not shown in the drawing, which acts as a sound-absorbing element.
  • a hose fitting 30 made of rubber or similar damping material is pushed onto the connecting piece 26, in which the medium channel 23 extends further.
  • the medium channel 23 is connected to the control chamber of an approximately membrane-operated pressure switch 32 via a T-branch 31 of the hose fitting 30.
  • the pressure switch optionally controls the function of the electric motor 2 in connection with an electronic control circuit, which is arranged on a circuit board 33.
  • the throttle point can also be molded directly into the line leading to the pressure switch 32 in the T-branch.
  • the free end 36 of the hose fitting 30 forms the outlet of the pump unit.
  • the vane pump 1 connected to the electric motor 2 via the adapter part 15, the pressure switch 32 and the hose fitting 30 are arranged together with a circuit board 33 in the interior of an outer housing.
  • the outer housing consists of a box-shaped part 38 closed from above with a cover 37, which has a cylindrical extension 39 on its side facing away from the cover 37. Box-shaped part 38 and cylindrical extension 39 are glued, for example.
  • the cover 37 can also be glued to the box-shaped part 38 or can be held by snap closures, which are not shown in the drawing but are known per se.
  • Openings 40 are arranged in the cover 37, via which the interior of the outer housing 37 to 39 is connected to the ambient atmosphere.
  • the openings 40 can also be covered with a cover made of, in particular, open-cell foam.
  • the electric motor 2 with the vane pump 1 attached to it is positively secured against rotation by form rings 41, 42 which are made of rubber or other elastic materials.
  • the electric motor stands on the bottom of the molded ring 42 and is held from above by a slightly deformed rubber ring 43, like the other molded rings 41, 42, which is supported on the inside of the cover 37.
  • the electric motor is controlled via connecting cables 44, 45, which are guided in the interior of the outer housing 37 to 39 and via connecting lines 45, also not shown, which lead to the circuit board 33.
  • the electronic circuit arranged on the circuit board 33 is supplied with current via connecting lines 46 which are only shown in broken lines in the drawing.
  • the interior of the cylindrical extension 39 of the outer housing is - as can be seen from what has been said above - separated from the rest of the interior in the box-shaped part 38 of the outer housing by the molded ring 41 inserted with slight prestress. For this reason, the molded ring 41 is connected to a plurality of flow openings 47 connecting the interior spaces mentioned.
  • the function of the pump unit is as follows: When the rotor 8 rotates in the direction of the arrow 48 (FIG. 2), pressure medium is drawn in through the medium channel 23 and a negative pressure is generated in the medium channel 23. In this direction of rotation, the vane pump works as a pressure sink. The pressure medium pushed out via the medium channel 22 reaches the interior 19 and from there via the interior of the electric motor 2, the opening 29 into the interior of the cylindrical extension 39 of the outer housing. From there, the pressure medium finally reaches the openings 40 in the cover 37 via the flow openings 47, from where the pressure medium can flow out to the free ambient atmosphere.
  • the electric motor 2 is always set in motion via the pressure switch 32 when the vacuum, e.g. has not yet reached a set value.
  • the vane pump 1 may also have to act as a pressure source.
  • the power supply to the electric motor 2 is reversed by means of the electronic control circuit on the circuit board 33, so that the motor 8 rotates counter to the arrow 48. It is obvious that the flow direction described above is reversed and that a pressure which is higher than the external pressure is present in the medium channel 23.
  • the flow noise is very strongly damped by the fact that the interior of the outer housing 37 to 39, as well as the interior of the electric motor 2 and the interior 19 of the adapter part 15 act as a series of silencing chambers.
  • the molded rings 41, 42, 43 which are made of rubber or a similarly damping material, provide structure-borne noise decoupling of the pump unit from the outer housing 37 to 39.
  • a structural sound decoupling of the pump assembly relative to the outer housing 37 to 39 is likewise effected by the shaped piece 30.
  • the throttling point 34 results in an airborne sound decoupling of the pressure switch 32 connected to the outer housing 37 to 39 in a sound-conducting manner: the throttling point means that only a quasi-static pressure is present at the pressure switch, so that the dynamic pressure fluctuations which stimulate the sound switch cannot reach the pressure switch.
  • the rubber material of the T-branch also decouples structure-borne noise.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

1. Electromotor-driven pumping unit consisting of a vane-cell pump having a housing and with two medium channels for supplying and removing the pressure medium, the housing of the vane-cell pump being fastened to the housing of an electric motor by means of an adapter part and one medium channel opening into the interior of the adapter part, characterized in that the closed-off interior (19) of the adaptor (15) is connected via at least one through-orifice (24) to the interior of the housing of the electric motor (2).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Pumpaggregat nach der Gattung des Hauptanspruchs. Es ist schon ein derartiges Pumpaggregat bekannt, bei dem die Mediumkanäle zur Zuuhd Abführung des Druckmediums in zwei an der Außenseite des Pumpengehäuses angeordneten Anschlußstutzen verlaufen. Beim Betrieb dieses Pumpaggregats hat sich gezeigt, daß - insbesondere wenn ein gasförmiges Druckmedium wie Luft verwendet wird, die beim Betrieb auftretenden Strömungsgeräusche, aber auch die Motorgeräusche als sehr störend empfunden werden. Ganz besonders gilt dies dann, wenn das bekannte Pumpaggregat in einem Kraftfahrzeug befestigt ist und zur Betätigung etwa einer Zentralverriegelungsanlage eingesetzt werden soll. Hierbei werden der vom Pumpaggregat erzeugte Luft- und Körperschall ungedämpft in die Karosserie des Kraftfahrzeugs eingeleitet, welche sogar noch als Resonanzboden dient.The invention is based on a pump unit according to the preamble of the main claim. A pump unit of this type is already known, in which the medium channels for the removal of the pressure medium run in two connecting pieces arranged on the outside of the pump housing. During the operation of this pump unit, it has been shown that - especially when a gaseous pressure medium such as air is used, the flow noises occurring during operation, but also the motor noises, are perceived as very disruptive. This is particularly true when the known pump unit is fastened in a motor vehicle and is to be used to actuate a central locking system, for example. Here, the airborne and structure-borne noise generated by the pumping unit are introduced without damping into the body of the motor vehicle, which even serves as a soundboard.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Aggregat mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegeüber den Vorteil, daß die Strömungsgeräusche des Pumpaggregats ohne großen Aufwand reduziert werden können, wenn konstruktiv sowieso notwendige Hohlräume des Pumpaggregats gewissermaßen als Schalldämpfkammern ausgenutzt werden.The unit according to the invention with the characterizing features of the main claim has the advantage over the that the flow noise of the pump unit can be reduced without great effort if the cavities of the pump unit that are necessary anyway are used as sound-absorbing chambers.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Pumpaggregats möglich. Besonders vorteilhaft ist, daß der geschlossene, insbesondere von den Gehäusen einerseits der Flügelzellenpumpe und andererseits des Elektromotors begrenzte Innenraum des Adapters über mindestens eine insbesondere als Drosselstelle ausgebildete Durchgangsöffnung mit dem Innenraum des Gehäuses des Elektromotors verbunden ist. Hierdurch wird der zuerst genannten "Schalldämpfkammer" eine zweite, sowieso vorhandene "Schalldämpfkammer" nachgeschaltet, die zwangsweise von dem Druckmedium im Betrieb des Pumpaggregats durchströmt werden müssen. Hierdurch wird das eingangs erwähnte Strömungsgeräusch noch weiter gedämpft, ohne daß dazu ein das Gewicht oder das Volumen des Pumpaggregats vergrößernder apparativer Aufwand getrieben werden muß.Advantageous further developments and improvements of the pump unit specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous that the closed interior of the adapter, in particular limited by the housings on the one hand of the vane pump and on the other hand of the electric motor, is connected to the interior of the housing of the electric motor via at least one through opening, in particular a throttle point. As a result, the first-mentioned "silencing chamber" is followed by a second "silencing chamber", which is present anyway and must be flowed through by the pressure medium during operation of the pump unit. As a result, the flow noise mentioned at the outset is attenuated even further without having to drive an apparatus expenditure which increases the weight or the volume of the pump unit.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Längsschnitt durch ein elektromotorisch angetriebenes Pumpaggregat, Figur 2 einen Querschnitt längs II-II der Figur 1 und Figur 3 eine teilweise geschnittene Draufsicht gemäß III-III der Figur 1.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a longitudinal section through an electric motor-driven pump unit, FIG. 2 shows a cross section along II-II in FIG. 1, and FIG. 3 shows a partially sectioned top view according to III-III in FIG. 1.

Beschreibung des AusführungsbeispielesDescription of the embodiment

In der Zeichnung ist ein Pumpaggregat dargestellt, das im wesentlichen aus einer Flügelzellenpumpe 1 und einem Elektromotor 2 besteht. Die eigentliche Flügelzellenpumpe besteht aus einem Hubring 3, in dem exzentrisch eine zylindrische Gehäuseausnehmung 4 angeordnet ist. Axial ist die Gehäuseausnehmung 4 durch zwei Seitenplatten 5, 6 begrenzt, deren Außendurchmesser mit dem Außendurchmesser des Hubrings 3 übereinstimmt. Hubring 3 und Seitenplatten 5, 6 sind durch Stifte 7 untereinander gegen Verschiebung gesichert. In der Gehäuseausnehmung 4 befindet sich konzentrisch zur Außenkontur der Flügelzellenpumpe ein Rotor 8, in dessen radial angeordneten Schlitzen 9 Flügel 10 dicht und gleitend geführt sind. Die Flügel 10 berühren mit ihren Außenkanten die zylindrische Innenwandung der Gehäuseausnehmung 4 und teilen den zwischen der Außenfläche des Rotors 8 und der Wandung der Gehäuseausnehmung 4 gebildeten, etwa sichelförmigen Arbeitsraum in einzelnen Zellen auf. Geführt ist der Rotor auf einer Pumpenwelle 11, die ihrerseits in konzentrisch in den Seitenplatten 5, 6 angeordneten Lagerbohrungen gehalten ist. Die axial durch die Seitenplatten 5, 6 begrenzte Flügelzellenpumpe ist von oben mit einem Schutzdeckel 13 abgedeckt und mittels dreier Senkschrauben 12 an einem Flansch 14 eines im wesentlichen zylindrischen Adapterteils 15 festgeschraubt. Das Adapterteil 15 ist - wie Figur 1 erkennen läßt - im wesentlichen rohrförmig aufgebaut und weist nahe ihrem dem Flansch 14 abgewandten Ende eine ebene Stirnwand 16 auf. Die Stirnwand 16 sitzt flächig auf einem lagerschildartigen Stirndeckel 17 des Elektromotors 2 auf und ist dort mittels Zylinderkopfschrauben 18 befestigt. In radialer Richtung ist das Adapterteil durch den Teil seiner zylindrischen Wand justiert, die auf der von der Flügelzellenpumpe 1 abgewandten Seite über die Stirnwand 16 hinausragt und an der zylindrischen Außenfläche des Gehäuses des Elektromotors 2 anliegt.In the drawing, a pump unit is shown, which consists essentially of a vane pump 1 and an electric motor 2. The actual vane pump consists of a lifting ring 3, in which a cylindrical housing recess 4 is arranged eccentrically. The housing recess 4 is axially delimited by two side plates 5, 6, the outer diameter of which corresponds to the outer diameter of the cam ring 3. The cam ring 3 and side plates 5, 6 are secured against displacement by pins 7 with one another. In the housing recess 4 there is a rotor 8 concentric with the outer contour of the vane pump, in the radially arranged slots 9 of which vanes 10 are tightly and slidably guided. The outer edges of the blades 10 touch the cylindrical inner wall of the housing recess 4 and divide the approximately sickle-shaped working space formed between the outer surface of the rotor 8 and the wall of the housing recess 4 into individual cells. The rotor is guided on a pump shaft 11, which in turn is held in bearing bores arranged concentrically in the side plates 5, 6. The vane cell pump, which is delimited axially by the side plates 5, 6, is covered from above with a protective cover 13 and screwed onto a flange 14 of an essentially cylindrical adapter part 15 by means of three countersunk screws 12. As can be seen in FIG. 1, the adapter part 15 is essentially tubular and has a flat end wall 16 near its end facing away from the flange 14. The end wall 16 is seated flat on a end plate-like end cover 17 of the electric motor 2 and is fastened there by means of cylinder head screws 18. In the radial direction, the adapter part is adjusted by the part of its cylindrical wall that is on the vane pump 1 the opposite side protrudes beyond the end wall 16 and abuts the cylindrical outer surface of the housing of the electric motor 2.

Im Innenraum 19 des Adapterteils 15 ist die Pumpenwelle 11 und die Welle 20 des Elektromotors 2 mittels einer an sich bekannten elastischen Kupplung 21 verbunden.In the interior 19 of the adapter part 15, the pump shaft 11 and the shaft 20 of the electric motor 2 are connected by means of an elastic coupling 21 known per se.

Bei dem hier beschriebenen Ausführungsbeispiel sind der Hubring 3 und die Seitenplatten 5, 6 aus Kunststoff gefertigt, während der Schutzdeckel 13 und das Adapterteil 15 aus Aluminium bestehen können. Natürlich können auch diese Teile aus Kunststoff gefertigt werden.In the embodiment described here, the cam ring 3 and the side plates 5, 6 are made of plastic, while the protective cover 13 and the adapter part 15 can be made of aluminum. Of course, these parts can also be made of plastic.

Beim Umlauf des Rotors 8 verändern die von den Flügeln 10 abgeteilten Zellen im Innenraum 4 ihre Größe. In Bereichen jeweils nahe der Stelle, an der sich die Mantelfläche des Rotors 8 die zylindrische Innenfläche der Gehäuseausnehmung 4 fast berühren, sind in an sich bekannter Art und Weise - und deshalb in der Zeichnung nur strichpunktiert angedeutet - Mediumkanäle 22, 23 (Figur 2) zur Zu- und Abführung des Druckmediums angeordnet. Der Mediumkanal 22 mündet - wie in Figur 1 und 3 angedeutet - in den Innenraum 19 des Adapterteils 15. Der andere Mediumkanal 23 ist von einem Vorsprung 25 nach radial innen in der Ebene des Flansches 14 abgedeckt. Der Vorsprung 25 wiederum trägt einen Anschlußstutzen 26, in dem sich der andere Mediumkanal 23 fortsetzt. Wie Figur 3 erkennen läßt, durchstößt der Anschlußstutzen 26 die zylindrische Wandung des Adapterteils 15 nach außen.When the rotor 8 rotates, the cells divided by the vanes 10 change their size in the interior 4. In areas close to the point at which the outer surface of the rotor 8 almost touches the cylindrical inner surface of the housing recess 4, medium channels 22, 23 (FIG. 2) are shown in a manner known per se - and therefore only indicated by dash-dotted lines in the drawing. arranged for supply and discharge of the print medium. The medium channel 22 opens - as indicated in FIGS. 1 and 3 - into the interior 19 of the adapter part 15. The other medium channel 23 is covered by a projection 25 radially inward in the plane of the flange 14. The projection 25 in turn carries a connecting piece 26 in which the other medium channel 23 continues. As can be seen in FIG. 3, the connecting piece 26 pierces the cylindrical wall of the adapter part 15 to the outside.

Der abgeschlossene Innenraum 19 des Adapterteils 15 ist über eine Durchgangsöffnung 24, deren Strömungsquerschnitt etwa gleich groß ist wie derjenige des Mediumkanals 22, mit dem in der Zeichnung nicht näher dargestellten - weil an sich bekannten - Innenraum des Gehäuses des Elektromotors 2 verbunden. Natürlich kann bei besonderen Ausführungsbeispielen die Durchgangsöffnung 24 auch als Drosselstelle ausgebildet sein. Die Durchgangsöffnung 24 ist auf der dem Elektromotor 2 zugewandten Seite mit einer Erweiterung 27 versehen, die von einem vorzugsweise als Drahtgeflecht ausgebildeten Filterplättchen 28 abgedeckt ist.The closed interior 19 of the adapter part 15 is via a through opening 24, the flow cross section of which is approximately the same as that of the medium channel 22, connected to the interior of the housing of the electric motor 2, which is not known in the drawing - because it is known per se. Of course, the passage opening 24 can also be designed as a throttle point in special exemplary embodiments. The through opening 24 is provided on the side facing the electric motor 2 with an extension 27, which is covered by a filter plate 28, which is preferably designed as a wire mesh.

Der Innenraum des Elektromotors 2 ist über mindestens einen in dessen Gehäusewandung angeordneten Durchbruch 29, der in einem den Stirndeckel 17 abgewandten Bereich angeordnet ist, mit der Außenseite des Elektromotors verbunden. Dabei kann der Durchbruch auch nicht mit einer in der Zeichnung nicht dargestellten offenporigen Schaumstofflage, die als Schalldämpfelement wirkt, abgedeckt sein.The interior of the electric motor 2 is connected to the outside of the electric motor via at least one opening 29 arranged in its housing wall, which is arranged in an area facing away from the end cover 17. The breakthrough can also not be covered with an open-pore foam layer, not shown in the drawing, which acts as a sound-absorbing element.

Auf den Anschlußstutzen 26 ist ein aus Gummi oder ähnlich dämpfendem Werkstoff bestehendes Schlauchformstück 30 aufgeschoben, in dem der Mediumkanal 23 weiter verläuft. Über einen T-Abzweig 31 des Schlauchformstücks 30 ist der Mediumkanal 23 mit dem Steuerraum eines etwa membranbetätigten Druckschalters 32 verbunden. Der Druckschalter steuert gegebenenfalls in Verbindung mit einer elektronischen Steuerschaltung, die auf einer Schaltplatine 33 angeordnet ist, die Funktion des Elektromotors 2. In der zum Druckschalter 32 führenden Leitung im T-Abzweig des Schlauchformstücks 30 ist ein eine Drosselstelle 34 enthaltendes Einsatzteil 35 angeordnet. Natürlich kann die Drosselstelle auch direkt in die zum Druckschalter 32 führende Leitung im T-Abzweig eingeformt sein. Das freie Ende 36 des Schlauchformstücks 30 bildet den Ausgang des Pumpaggregats.A hose fitting 30 made of rubber or similar damping material is pushed onto the connecting piece 26, in which the medium channel 23 extends further. The medium channel 23 is connected to the control chamber of an approximately membrane-operated pressure switch 32 via a T-branch 31 of the hose fitting 30. The pressure switch optionally controls the function of the electric motor 2 in connection with an electronic control circuit, which is arranged on a circuit board 33. Of course, the throttle point can also be molded directly into the line leading to the pressure switch 32 in the T-branch. The free end 36 of the hose fitting 30 forms the outlet of the pump unit.

Wie aus der Zeichnung ersichtlich ist, ist die mit dem Elektromotor 2 über das Adapterteil 15 verbundene Flügelzellenpumpe 1 der Druckschalter 32 und das Schlauchformstück 30 zusammen mit einer Schaltplatine 33 im Innenraum eines Außengehäuses angeordnet. Das Außengehäuse besteht aus einem von oben mit einem Deckel 37 verschlossenen kastenförmigen Teil 38, das auf seiner dem Deckel 37 abgewandten Seite einen zylindrischen Ansatz 39 aufweist. Kastenförmiges Teil 38 und zylindrischer Ansatz 39 sind beispielsweise verklebt. Ebenso kann der Deckel 37 auch mit dem kastenförmigen Teil 38 verklebt sein oder aber durch in der Zeichnung nicht dargestellte, aber an sich bekannte Rastverschlüsse gehalten sein. Im Deckel 37 sind Durchbrüche 40 angeordnet, über die der Innenraum des Außengehäuses 37 bis 39 mit der Umgebungsatmosphäre verbunden ist. Die Durchbrüche,40 können auch noch mit einer Abdeckung aus insbesondere offenporigem Schaumstoff abgedeckt sein.As can be seen from the drawing, the vane pump 1 connected to the electric motor 2 via the adapter part 15, the pressure switch 32 and the hose fitting 30 are arranged together with a circuit board 33 in the interior of an outer housing. The outer housing consists of a box-shaped part 38 closed from above with a cover 37, which has a cylindrical extension 39 on its side facing away from the cover 37. Box-shaped part 38 and cylindrical extension 39 are glued, for example. Likewise, the cover 37 can also be glued to the box-shaped part 38 or can be held by snap closures, which are not shown in the drawing but are known per se. Openings 40 are arranged in the cover 37, via which the interior of the outer housing 37 to 39 is connected to the ambient atmosphere. The openings 40 can also be covered with a cover made of, in particular, open-cell foam.

Im zylindrischen Ansatz 39 steht der Elektromotor 2 mit der daran befestigten Flügelzellenpumpe 1 durch Formringe 41, 42, die aus Gummi oder anderen elastischen Werkstoffen hergestellt sind, formschlüssig gegen Verdrehen gesichert. In axialer Richtung steht der Elektromotor unten auf dem Formring 42 auf und wird von oben durch einen - wie die übrigen Formringe 41, 42 auch - elastisch leicht verformten Gummiring.43, der sich an der Innenseite des Deckels 37 abstützt, gehalten.In the cylindrical extension 39, the electric motor 2 with the vane pump 1 attached to it is positively secured against rotation by form rings 41, 42 which are made of rubber or other elastic materials. In the axial direction, the electric motor stands on the bottom of the molded ring 42 and is held from above by a slightly deformed rubber ring 43, like the other molded rings 41, 42, which is supported on the inside of the cover 37.

Über Anschlußkabel 44, 45, die im Innenraum des Außengehäuses 37 bis 39 geführt sind und über ebenfalls nicht näher dargestellte Verbindungsleitungen 45, die zur Schaltplatine 33 führen, wird der Elektromotor gesteuert. Die auf der Schaltplatine 33 angeordnete elektronische Schaltung wird über in der Zeichnung nur strichpunktiert dargestellte Anschlußleitungen 46 mit Strom versorgt.The electric motor is controlled via connecting cables 44, 45, which are guided in the interior of the outer housing 37 to 39 and via connecting lines 45, also not shown, which lead to the circuit board 33. The electronic circuit arranged on the circuit board 33 is supplied with current via connecting lines 46 which are only shown in broken lines in the drawing.

Der Innenraum des zylindrischen Ansatzes 39 des Außengehäuses ist - wie aus dem oben Gesagten hervorgeht - durch den mit leichter Vorspannung eingefügten Formring 41 vom übrigen Innenraum im kastenförmigen Teil 38 des Außengehäuses abgeteilt. Deshalb ist der Formring 41 mit mehreren die genannten Innenräume miteinander verbindenden Strömungsöffnungen 47 verbunden.The interior of the cylindrical extension 39 of the outer housing is - as can be seen from what has been said above - separated from the rest of the interior in the box-shaped part 38 of the outer housing by the molded ring 41 inserted with slight prestress. For this reason, the molded ring 41 is connected to a plurality of flow openings 47 connecting the interior spaces mentioned.

Die Funktion des Pumpaggregat ist folgendermaßen: Beim Umlauf des Rotors 8 in Richtung des Drehpfeiles 48 (Figur 2) wird durch den Mediumkanal 23 Druckmedium angesaugt und dabei im Mediumkanal 23 ein Unterdruck erzeugt. Bei dieser Drehrichtung arbeitet die Flügelzellenpumpe also als Drucksenke. Das über den Mediumkanal 22 ausgeschobene Druckmedium gelangt in den Innenraum 19 und von dort über den Innenraum des Elektromotors 2, den Durchbruch 29 in den Innenraum des zylindrischen Ansatzes 39 des Außengehäuses. Von dort gelangt das Druckmedium über die Strömungsöffnungen 47 schließlich zu den Durchbrüchen 40 im Deckel 37 von wo das Druckmedium an die freie Umgebungsatmosphäre abströmen kann. Über den Druckschalter 32 wird der Elektromotor 2 immer dann in Bewegung gesetzt, wenn der Unterdruck z.B. einen eingestellten Wert noch nicht erreicht hat. Bei bestimmten Anwendungsfällen kann es vorkommen, daß die Flügelzellenpumpe 1 auch als Druckquelle fungieren muß. Dazu wird mittels der elektronischen Steuerschaltung auf der Schaltplatine 33 die Stromzuleitung zum Elektromotor 2 umgepolt, so daß der Motor 8 entgegen dem Drehpfeil 48 umläuft. Es liegt auf der Hand, daß sich die oben beschriebene Strömungsrichtung umkehrt und im Mediumkanal 23 ein gegenüber dem Außendruck erhöhter Druck anliegt.The function of the pump unit is as follows: When the rotor 8 rotates in the direction of the arrow 48 (FIG. 2), pressure medium is drawn in through the medium channel 23 and a negative pressure is generated in the medium channel 23. In this direction of rotation, the vane pump works as a pressure sink. The pressure medium pushed out via the medium channel 22 reaches the interior 19 and from there via the interior of the electric motor 2, the opening 29 into the interior of the cylindrical extension 39 of the outer housing. From there, the pressure medium finally reaches the openings 40 in the cover 37 via the flow openings 47, from where the pressure medium can flow out to the free ambient atmosphere. The electric motor 2 is always set in motion via the pressure switch 32 when the vacuum, e.g. has not yet reached a set value. In certain applications, the vane pump 1 may also have to act as a pressure source. For this purpose, the power supply to the electric motor 2 is reversed by means of the electronic control circuit on the circuit board 33, so that the motor 8 rotates counter to the arrow 48. It is obvious that the flow direction described above is reversed and that a pressure which is higher than the external pressure is present in the medium channel 23.

Die bei der Funktion der Flügelzellenpumpe enstehenden Strömungsgeräusche, die insbesondere dann sehr stark stören, wenn das Pumpaggregat in einem Kraftfahrzeug zur Betä-- tigung etwa einer Zentralschließanlage oder sonstiger Komforteinrichtungen Verwendung finden soll, aber auch die Motorgeräusche des Elektromotors und sonstiger durch die Bewegung der Maschinenteile hervorgerufene Geräusche werden durch die erfindungsgemäße Konstruktion sehr stark gedämpft. Im einzelnen werden die Strömungsgeräusch dadurch sehr stark gedämpft, daß der Innenraum des Außengehäuses 37 bis 39, sowie der Innenraum des Elektromotors 2 und der Innenraum 19 des Adapterteils 15 als hintereinander geschaltete Schalldämpfungskammern wirken. Durch die Formringe 41, 42, 43, die aus Gummi oder einem ähnlich dämpfendem Werkstoff bestehen, findet eine Körperschallentkopplung des Pumpenaggregats von Außengehäuse 37 bis 39 statt. Durch das Formstück 30 wird ebenfalls eine Körperschallentkopp- , lung des Pumpenaggregats gegenüber dem Außengehäuse 37 bis 39 bewirkt. Die Drosselstelle 34 hat eine Luftschallentkopplung des mit dem Außengehäuse 37 bis 39 schalleitend verbundenen Druckschalters 32 zur Folge: Durch die Drosselstelle steht am Druckschalter nur ein quasistatischer Druck an, so daß die den Druckschalter zur Schallemision anregenden dynamischen Druckschwankungen nicht zum Druckschalter gelangen können. Natürlich bewirkt der Gummiwerkstoff des T-Abzweigs auch eine Körperschallentkopplung.The flow noises that occur during the function of the vane pump, which then disrupt very strongly Ren if the pump unit is to be used in a motor vehicle for actuating a central locking system or other comfort devices, but also the motor noises of the electric motor and other noises caused by the movement of the machine parts are very strongly dampened by the construction according to the invention. In particular, the flow noise is very strongly damped by the fact that the interior of the outer housing 37 to 39, as well as the interior of the electric motor 2 and the interior 19 of the adapter part 15 act as a series of silencing chambers. The molded rings 41, 42, 43, which are made of rubber or a similarly damping material, provide structure-borne noise decoupling of the pump unit from the outer housing 37 to 39. A structural sound decoupling of the pump assembly relative to the outer housing 37 to 39 is likewise effected by the shaped piece 30. The throttling point 34 results in an airborne sound decoupling of the pressure switch 32 connected to the outer housing 37 to 39 in a sound-conducting manner: the throttling point means that only a quasi-static pressure is present at the pressure switch, so that the dynamic pressure fluctuations which stimulate the sound switch cannot reach the pressure switch. Of course, the rubber material of the T-branch also decouples structure-borne noise.

Claims (16)

1. Elektromotorisch angetriebenes Pumpaggregat, vorzugsweise für die Betätigung einer Zentralverriegelungsanlage in einem Kraftfahrzeug, bestehend aus einer ein Gehäuse, insbesondere aus Kunststoff, aufweisenden Flügelzellenpumpe mit zwei Mediumkanälen zur Zu- und Abführung des Druckmediums, inbesondere Luft, wobei das Gehäuse der Flügelzellenpumpe mittels eines vorzugsweise ebenfalls aus Kunststoff bestehenden, im wesentlichen rohrförmigen Adapterteils am Gehäuse eines Elektromotors, vorzugsweise an dessen lagerschildartigen Stirndeckel befestigt ist, dadurch gekennzeichnet, daß der eine Mediumkanal (22) in den Innenraum (19) des Adapterteils (15) mündet.1. Electric motor-driven pump unit, preferably for actuating a central locking system in a motor vehicle, consisting of a vane pump with a housing, in particular made of plastic, with two medium channels for supplying and discharging the pressure medium, in particular air, the housing of the vane pump preferably using a likewise made of plastic, essentially tubular adapter part on the housing of an electric motor, preferably attached to its end plate-like end cover, characterized in that one medium channel (22) opens into the interior (19) of the adapter part (15). 2. Pumpaggregat nach Anspruch 1, dadurch gekennzeichnet, daß der abgeschlossene, insbesondere von den Gehäusen einerseits der Flügelzellenpumpe (1) und andererseits des Elektromotors (2) begrenzte Innenraum (19) des Adapters (15) über mindestens eine, insbesondere als Drosselstelle ausgebildete Durchgangsöffnung (24) mit dem Innenraum des Gehäuses des Elektromotors (2) verbunden ist.2. Pump unit according to claim 1, characterized in that the closed, in particular by the housings on the one hand the vane pump (1) and on the other hand the electric motor (2) limited interior (19) of the adapter (15) via at least one, in particular designed as a throttle passage (24) is connected to the interior of the housing of the electric motor (2). 3. Pumpaggregat nach Anspruch 2, dadurch gekennzeichnet, daß der Innenraum des Elektromotors (2) über mindestens einen in dessen Gehäusewandung angeordneten Durchbruch (29), der in einem dem Ende mit der Durchgangsöffnung (24) abgewandten Bereich des Gehäuses des Elektromotors (2) angeordnet ist mit der Außenseite des Elektromotors verbunden ist.3. Pump unit according to claim 2, characterized in that the interior of the electric motor (2) has at least one opening (29) arranged in the housing wall thereof, which in a region of the housing of the electric motor (2) facing away from the end with the through opening (24). is arranged is connected to the outside of the electric motor. 4. Pumpaggregat nach Anspruch 3, dadurch gekennzeichnet, daß der Durchbruch (29) mit einer offenporigen Schaumstofflage abgedeckt ist.4. Pump unit according to claim 3, characterized in that the opening (29) is covered with an open-cell foam layer. 5. Pumpaggregat nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der Strömungsquerschnitt der Durchgangsöffnung (24) etwa gleich groß ist wie diejenige des in den Innenraum (19) des Adapterteils (15) mündenden Mediumkanals (22).5. Pump unit according to claim 2 or 3, characterized in that the flow cross section of the through opening (24) is approximately the same size as that of the medium channel (22) opening into the interior (19) of the adapter part (15). 6. Pumpaggregat nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Adapterteil (15) eine vorzugsweise ebene Stirnwand (16) aufweist, in der die zum Innenraum des Elektromotors (2) führende Durchgangsöffnung (24) angeordnet ist.6. Pump unit according to one of the preceding claims, characterized in that the adapter part (15) has a preferably flat end wall (16) in which the through opening (24) leading to the interior of the electric motor (2) is arranged. 7. Pumpaggregat nach Anspruch 6, dadurch gekennzeichnet, daß die Durchgangsöffnung (24) zum Elektromotor (2) hin eine Erweiterung (27) hat, die von einem, insbesondere als Drahtgeflecht ausgebildeten Filterplättchen (28) abgedeckt ist.7. Pump unit according to claim 6, characterized in that the through opening (24) to the electric motor (2) has an extension (27) which is covered by a filter plate (28), in particular in the form of a wire mesh. 8. Pumpaggregat nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der andere Mediumkanal (23) in einem am Adapterteil (15) angeordneten Anschlußstutzen (26) verläuft.8. Pump unit according to one of the preceding claims, characterized in that the other medium channel (23) in a on the adapter part (15) arranged connecting piece (26). 9. Pumpaggregat nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der andere Mediumkanal (23) durch ein insbesondere auf den Anschlußstutzen (26) aufgeschobenes Schlauchformstück (30) aus Gummi oder ähnlichem Werkstoff verläuft.9. Pump unit according to one of the preceding claims, characterized in that the other medium channel (23) extends through a hose fitting (30) made of rubber or similar material, in particular pushed onto the connecting piece (26). 10. Pumpaggregat nach Anspruch 9, dadurch gekennzeichnet, daß der Mediumkanal (23) vorzugsweise über einen T-Abzweig (31) des Schlauchformstücks (30) mit dem Steuerraum eines vorzugsweise membranbetätigten Druckschalters (32) verbunden ist, der den Elektromotor (2) des Pumpenaggregats steuert.10. Pump unit according to claim 9, characterized in that the medium channel (23) is preferably connected via a T-branch (31) of the hose fitting (30) to the control chamber of a preferably membrane-operated pressure switch (32) which the electric motor (2) of Pump unit controls. 11. Pumpaggregat nach Anspruch 10, dadurch gekennzeichnet, daß in der zum Druckschalter (32) führenden Leitung eine, insbesondere in den T-Abzweig (31) eingeformte Drosselstelle (34) angeordnet ist.11. Pump unit according to claim 10, characterized in that in the line leading to the pressure switch (32) a, in particular in the T-branch (31) molded throttle point (34) is arranged. 12. Pumpaggregat nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die im wesentlichen radial in Schlitzen (9) des Pumpenrotors (8) bewegliche Flügel (10) aufweisende Flügelzellenpumpe (1) je nach ihrer Umdrehungsrichtung (48) als Druckquelle oder -senke arbeitet.12. Pump unit according to one of the preceding claims, characterized in that the substantially radially in slots (9) of the pump rotor (8) movable vane (10) having vane pump (1) depending on their direction of rotation (48) works as a pressure source or sink . 13. Pumpaggregat nach mindestens einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die mit dem Elektromotor (2) verbundene Flügelzellenpumpe (1), der Druckschalter (32) und das Schlauchformstück (30) und gegebenenfalls eine elektronische Steuerschaltung tragende Schaltplatine im Innenraum eines Außengehäuses (37, 39) durch Körperschall dämpfende Haltemittel (41 bis (43) justiert angeordnet sind.13. Pump unit according to at least one of the preceding claims, characterized in that the vane pump (1) connected to the electric motor (2), the pressure switch (32) and the hose fitting (30) and optionally an electronic control circuit-carrying circuit board in the interior of an outer housing ( 37, 39) holding means (41 to (43) damping structure-borne noise are arranged in an adjusted manner. 14. Pumpagrregat nach Anspruch 13, dadurch gekennzeichnet, daß das Außengehäuse (37 bis 39) aus einem oben von einem Deckel (37) verschlossenen kastenförmigen Teil (38) besteht, daß auf seine dem.Deckel (37) abgewandten Seite einen zylindrischen Ansatz (39) aufweist, in dem der Elektromotor (2) mit der daran befestigten Flügelzellenpumpe (1) vorzugsweise formschlüssig gegen Verdrehen gesichert steht.14. Pump unit according to claim 13, characterized in that the outer housing (37 to 39) consists of a box-shaped part (38) closed at the top by a cover (37), that on its side facing away from the cover (37) there is a cylindrical extension ( 39) in which the Electric motor (2) with the vane pump (1) attached to it is preferably secured in a form-fitting manner against rotation. 15. Pumpaggregat nach Anspruch 1, dadurch gekennzeichnet, daß die Elektromotorwelle (20), die Pumpenwelle (11) über eine im Innenraum (19) des Adapterteils (15) angeordnete elastische Kupplung (21) miteinander verbunden sind.15. Pump unit according to claim 1, characterized in that the electric motor shaft (20), the pump shaft (11) via an in the interior (19) of the adapter part (15) arranged elastic coupling (21) are interconnected. 16. Pumpaggregat nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Innenraum des Außengehäuses (37 bis 39) über Durchbrüche (40) im Deckel (37) mit der Umgebungsatmosphäre verbunden ist und daß der vom Druckmedium durchströmte Innenraum des Außengehäuses vorzugsweise durch die der Halterung des Elektromotors (2) dienenden, mit Strömungsöffnung (47) versehenen Formringe (41) in einzelne, (Schalldämpfungs-) Kammern unterteilt ist.16. Pump unit according to one of the preceding claims, characterized in that the interior of the outer housing (37 to 39) via openings (40) in the cover (37) is connected to the ambient atmosphere and that the interior of the outer housing through which the pressure medium flows is preferably by the Bracket of the electric motor (2) serving, with flow opening (47) shaped rings (41) is divided into individual (silencing) chambers.
EP82109766A 1981-11-12 1982-10-22 Pump unit driven by an electric motor Expired EP0081659B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813144983 DE3144983A1 (en) 1981-11-12 1981-11-12 ELECTRICALLY DRIVEN PUMP UNIT
DE3144983 1981-11-12

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EP0081659A1 true EP0081659A1 (en) 1983-06-22
EP0081659B1 EP0081659B1 (en) 1985-04-10

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ID=6146254

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EP (1) EP0081659B1 (en)
JP (1) JPS5888485A (en)
DE (2) DE3144983A1 (en)

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GB2230051A (en) * 1989-02-17 1990-10-10 Walbro Corp In-tank fuel pump mount
FR2829192A1 (en) * 2001-09-05 2003-03-07 Peugeot Citroen Automobiles Sa DEVICE FOR PUMPING THE SUPPLY AIR OF A FUNCTIONAL VEHICLE
WO2014135202A1 (en) * 2013-03-05 2014-09-12 Pierburg Pump Technology Gmbh Electric motor vehicle vacuum pump arrangement

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JPS61291797A (en) * 1985-06-17 1986-12-22 Hitachi Ltd Rotary vane system pump
DE4107411A1 (en) * 1991-03-08 1992-09-17 Hella Kg Hueck & Co Radial and axial bearings for electric motor - is attached to both housing and motor with auxiliary radial fixing part attached only to housing
DE4435494A1 (en) * 1994-10-04 1996-04-11 Bosch Gmbh Robert Hydraulic power pack
BR9904147A (en) 1998-08-06 2000-09-05 Mitsubishi Electric Corp Rotary compressor, refrigeration cycle using the compressor, and refrigerator using the compressor
DE19848413B4 (en) * 1998-10-21 2009-06-04 Pierburg Gmbh Motor-pump unit

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US3513476A (en) * 1967-06-21 1970-05-19 Tokyo Shibaura Electric Co Rotary compressors
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Cited By (7)

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Publication number Priority date Publication date Assignee Title
GB2230051A (en) * 1989-02-17 1990-10-10 Walbro Corp In-tank fuel pump mount
GB2230051B (en) * 1989-02-17 1993-01-27 Walbro Corp In-tank fuel pump mount
FR2829192A1 (en) * 2001-09-05 2003-03-07 Peugeot Citroen Automobiles Sa DEVICE FOR PUMPING THE SUPPLY AIR OF A FUNCTIONAL VEHICLE
EP1291530A1 (en) * 2001-09-05 2003-03-12 Peugeot Citroen Automobiles SA Pump unit
WO2014135202A1 (en) * 2013-03-05 2014-09-12 Pierburg Pump Technology Gmbh Electric motor vehicle vacuum pump arrangement
CN105121856B (en) * 2013-03-05 2017-09-22 皮尔伯格泵技术有限责任公司 Electric vehicle vacuum pump assembly
US9989058B2 (en) 2013-03-05 2018-06-05 Pierburg Pump Technology Gmbh Electric motor vehicle vacuum pump arrangement

Also Published As

Publication number Publication date
EP0081659B1 (en) 1985-04-10
DE3263018D1 (en) 1985-05-15
DE3144983A1 (en) 1983-05-19
JPS5888485A (en) 1983-05-26

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