EP2729667B1 - Vacuum pump for use in the automotive sector - Google Patents

Vacuum pump for use in the automotive sector Download PDF

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Publication number
EP2729667B1
EP2729667B1 EP11730666.2A EP11730666A EP2729667B1 EP 2729667 B1 EP2729667 B1 EP 2729667B1 EP 11730666 A EP11730666 A EP 11730666A EP 2729667 B1 EP2729667 B1 EP 2729667B1
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EP
European Patent Office
Prior art keywords
housing
rotor
vacuum pump
motor
wall
Prior art date
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Active
Application number
EP11730666.2A
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German (de)
French (fr)
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EP2729667A1 (en
Inventor
Nabil Salim AL-HASAN
Sebastian Cramer
Daniel Müller
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.)
Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Publication date
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Publication of EP2729667A1 publication Critical patent/EP2729667A1/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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • 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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C18/3441—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings

Definitions

  • the invention relates to a vacuum pump for use in the automotive sector, having a rotor shaft mounted on a rotor element which is arranged in a rotor housing, and with an indirectly or directly driving the rotor shaft electric drive member which is arranged in a motor housing, wherein the rotor housing and the motor housing are connected to one another via a housing wall and form a housing arrangement, wherein the rotor shaft is mounted in the housing wall by means of a bearing device, and wherein the rotor housing has at least one inlet and one outlet.
  • the vacuum required for this purpose is provided in conventional vehicles predominantly either by suction pipe connections to gasoline engines or mechanical vacuum pumps to diesel engines.
  • electric vacuum pumps or electric vacuum pumps are used to ensure independent of the engine vacuum supply.
  • the motor for electrically driving the vacuum pump and the rotor which generates the negative pressure in a housing assembly. If the space allows, the rotor housing in the longitudinal direction connects to the motor housing, which is the motor shaft provided with the rotor directly driven by the electric drive member (see GB 2 159 581 A ).
  • the motor housing and the rotor housing are connected to each other via a housing wall through which the motor shaft extends.
  • the rotor shaft is mounted in the housing by means of a bearing device. Due to the negative pressure to be built up in the rotor housing, the bearing device is exposed to an extremely high load, so that, for example, lubricants in the Rotor chamber are sucked and proper storage can not take place.
  • a targeted leakage geometry is incorporated as a remedy, so that air is guided from the outlet to the shaft center in order to keep the load of the bearing device due to a pressure difference in the engine and rotor housing low.
  • This procedure is very complicated in the manufacture of the rotor housing, also is reduced by this desired leakage of the efficiency of the vacuum pump.
  • it is from the US Pat. No. 6,471,494 B1 known to provide a passage connection between the rotor housing and the motor housing to ensure pressure equalization. Again, the structural complexity is very high.
  • the object is to provide a vacuum pump for use in the automotive sector, which avoids the disadvantages mentioned above.
  • This object is achieved in that in the housing wall at least one passage opening which fluidly connects the rotor housing and the motor housing, is provided, wherein the at least one passage opening directly in the area the bearing device is provided between the bearing device and the housing wall.
  • a pressure balance between the motor housing and the rotor housing is created, which ensures a safe and longevity in life.
  • the housing assembly is hermetically sealed, the volumetric efficiency of the vacuum pump is increased.
  • a bearing device in particular a rolling bearing is suitable, which is inexpensive to manufacture and easy to install, and is no longer exposed to the high pressure difference due to the particular design of the housing with at least one passage opening, which would lead to a loss of grease of the bearing.
  • a thrust washer for the rotor element can be provided between the housing wall and a second cylinder wall piece.
  • FIG. 1 shows an electric vacuum pump 2 with a housing assembly 4.
  • the housing assembly 4 consists essentially of a motor housing 6 and a rotor housing 8.
  • a per se known electric motor 10 is provided with a control electronics 12 shown schematically.
  • the motor 10 acts in the present embodiment directly on a rotor shaft 14. It is of course also conceivable that the rotor shaft 14 is designed in several parts, or that a drive shaft of the motor 10 is connected via a coupling with a rotor shaft 14.
  • the motor housing 6 has, at the end remote from the rotor housing 8, a cover element 16 on which the control unit 12 for the electronically commutated motor 10 is arranged and which has a first rolling bearing 18 for supporting the rotor shaft 14.
  • the engine 10 may be implemented as a conventional mechanically commutated engine.
  • a housing wall 20 is provided, which closes the motor housing 6 airtight together with the cover member 16 and a cylinder wall piece 22.
  • the housing wall 20 has outwardly directed mounting flanges 24 for mounting the vacuum pump in the engine compartment.
  • the housing wall 20 forms a part of the rotor housing 8, which adjoins the motor housing 6 in the longitudinal direction and is likewise hermetically sealed by this housing wall 20.
  • the housing wall 20 is thus in the present embodiment both a part of the motor housing 6 and a part of the rotor housing 8. Furthermore, the rotor housing 8, a second cover member 26 and a second cylinder wall piece 28, wherein between the housing 20 and the housing second cylinder wall piece 28 a thrust washer 21 made of stainless steel for a rotor element 32 is arranged.
  • the second cover element 26 is bolted to the housing wall 20 via through-bolts 30, which extend through the second cylinder wall piece 28.
  • the rotor housing 8 is closed fluid-tight. Furthermore, the rotor housing 8 in known manner an inlet and an outlet, which are not shown in this illustration.
  • the rotor shaft 14 has the rotor element 32, which in the present case has a plurality of displaceably arranged wing elements and, accordingly, the vacuum pump is designed as a vane cell pump.
  • the rotor element 32 cooperates in a known manner with the second cylindrical housing part 28 and accordingly provides for the vacuum build-up.
  • a second rolling bearing 34 is arranged, in which the rotor shaft 14 is also mounted and through which the rotor shaft 14 extends into the rotor housing 8.
  • the housing wall 20 has three passage openings 36, which are arranged directly in the region of the roller bearing 34. In this way, a fluidic connection between the rotor housing and the motor housing 6 is provided, so that in the area of the rolling bearing device 34 no harm to the rolling bearing 34 harmful pressure difference.
  • FIG. 2 shows the motor housing 6 in a perspective view. Clearly visible is the housing wall 20 with the flange elements 24, via which the vacuum pump can be fastened in the engine compartment of the motor vehicle.
  • the rotor shaft 14 is mounted in the rolling bearing 34 and extends through the housing 20 through into the rotor space of the rotor housing 8, not shown.
  • the passage openings 36 which ensure the pressure equalization in the region of the rolling bearing 34.
  • the invention is not limited to the embodiment of a multi-vane vane pump, and is particularly applicable to, for example, a single-vane vacuum pump.

Description

Die Erfindung betrifft eine Vakuumpumpe zum Einsatz im Kraftfahrzeugbereich, mit einem auf einer Rotorwelle befestigtem Rotorelement, das in einem Rotorgehäuse angeordnet ist, und mit einem indirekt oder direkt die Rotorwelle antreibenden elektrischen Antriebsorgan, das in einem Motorgehäuse angeordnet ist, wobei das Rotorgehäuse und das Motorgehäuse über eine Gehäusewandung miteinander verbunden sind und eine Gehäuseanordnung bilden, wobei die Rotorwelle mittels einer Lagervorrichtung in der Gehäusewandung gelagert ist, und wobei das Rotorgehäuse mindestens einen Einlass und einen Auslass aufweist.The invention relates to a vacuum pump for use in the automotive sector, having a rotor shaft mounted on a rotor element which is arranged in a rotor housing, and with an indirectly or directly driving the rotor shaft electric drive member which is arranged in a motor housing, wherein the rotor housing and the motor housing are connected to one another via a housing wall and form a housing arrangement, wherein the rotor shaft is mounted in the housing wall by means of a bearing device, and wherein the rotor housing has at least one inlet and one outlet.

Verschiedene Verbraucher im Kraftfahrzeugbereich, wie zum Beispiel Bremsanlagen, basieren auf einer Unterdruckansteuerung. Der hierzu benötigte Unterdruck wird in konventionellen Fahrzeugen vorwiegend entweder durch Saugrohranschlüsse an Benzinmotoren oder mechanische Unterdruckpumpen an Dieselmotoren bereitgestellt. Insbesondere Bei Hybrid- und Elektrofahrzeugen werden elektrische Unterdruckpumpen bzw. elektrische Vakuumpumpen eingesetzt, um eine vom Verbrennungsmotor unabhängige Unterdruckversorgung zu gewährleisten. Aus der Praxis ist es darüber hinaus bekannt, den Motor zum elektrischen Antrieb der Vakuumpumpe und den Rotor, der den Unterdruck erzeugt, in einer Gehäuseanordnung unterzubringen. Wenn es der Bauraum erlaubt, schließt sich das Rotorgehäuse in Längsrichtung derart an das Motorgehäuse an, das die mit dem Rotor versehene Motorwelle direkt durch das elektrische Antriebsorgan antreibbar ist (siehe hierzu GB 2 159 581 A ). Hierbei sind das Motorgehäuse und das Rotorgehäuse über eine Gehäusewandung miteinander verbunden, durch die die Motorwelle reicht. Dabei ist die Rotorwelle in der Gehäusewandung mittels einer Lagervorrichtung gelagert. Aufgrund des aufzubauenden Unterdrucks im Rotorgehäuse ist die Lagervorrichtung einer extrem hohen Belastung ausgesetzt, so dass beispielsweise Schmierstoffe in den Rotorraum gesogen werden und eine ordnungsgemäße Lagerung nicht mehr stattfinden kann. In der Praxis wird als Abhilfe eine gezielte Leckagegeometrie eingebaut, so dass Luft aus dem Auslass zur Wellenmitte geführt wird, um die Belastung der Lagervorrichtung aufgrund eines Druckunterschiedes im Motor- und Rotorgehäuse gering zu halten. Diese Vorgehensweise ist sehr aufwendig in der Herstellung des Rotorgehäuses, zudem wird durch diese gewünschte Leckage der Wirkungsgrad der Vakuumpumpe verringert. Des Weiteren ist es aus der US 6,471,494 B1 bekannt, eine Durchtrittsverbindung zwischen Rotorgehäuse und Motorgehäuse vorzusehen, um einen Druckausgleich zu gewährleisten. Auch hierbei ist der bauliche Aufwand sehr hoch.Various consumers in the automotive sector, such as brake systems, based on a vacuum control. The vacuum required for this purpose is provided in conventional vehicles predominantly either by suction pipe connections to gasoline engines or mechanical vacuum pumps to diesel engines. In particular, in hybrid and electric vehicles electric vacuum pumps or electric vacuum pumps are used to ensure independent of the engine vacuum supply. From practice it is also known to accommodate the motor for electrically driving the vacuum pump and the rotor, which generates the negative pressure in a housing assembly. If the space allows, the rotor housing in the longitudinal direction connects to the motor housing, which is the motor shaft provided with the rotor directly driven by the electric drive member (see GB 2 159 581 A ). Here, the motor housing and the rotor housing are connected to each other via a housing wall through which the motor shaft extends. In this case, the rotor shaft is mounted in the housing by means of a bearing device. Due to the negative pressure to be built up in the rotor housing, the bearing device is exposed to an extremely high load, so that, for example, lubricants in the Rotor chamber are sucked and proper storage can not take place. In practice, a targeted leakage geometry is incorporated as a remedy, so that air is guided from the outlet to the shaft center in order to keep the load of the bearing device due to a pressure difference in the engine and rotor housing low. This procedure is very complicated in the manufacture of the rotor housing, also is reduced by this desired leakage of the efficiency of the vacuum pump. Furthermore, it is from the US Pat. No. 6,471,494 B1 known to provide a passage connection between the rotor housing and the motor housing to ensure pressure equalization. Again, the structural complexity is very high.

Somit stellt sich die Aufgabe, eine Vakuumpumpe zum Einsatz im Kraftfahrzeugbereich bereitzustellen, die die oben genannten Nachteile vermeidet. Diese Aufgabe wird dadurch gelöst, dass in der Gehäusewandung mindestens eine Durchtrittsöffnung, die das Rotorgehäuse und das Motorgehäuse fluidisch verbindet, vorgesehen ist, wobei die mindestens eine Durchtrittsöffnung direkt im Bereich
der Lagervorrichtung zwischen der Lagervorrichtung und der Gehäusewandung vorgesehen ist. Auf diese einfache und kostengünstige Weise wird ein Druckausgleich zwischen Motorgehäuse und Rotorgehäuse geschaffen, der eine sichere und hinsichtlich der Lebensdauer langlebige Funktion gewährleistet.Thus, the object is to provide a vacuum pump for use in the automotive sector, which avoids the disadvantages mentioned above. This object is achieved in that in the housing wall at least one passage opening which fluidly connects the rotor housing and the motor housing, is provided, wherein the at least one passage opening directly in the area
the bearing device is provided between the bearing device and the housing wall. In this simple and cost-effective manner, a pressure balance between the motor housing and the rotor housing is created, which ensures a safe and longevity in life.

Dadurch, dass die Gehäuseanordnung luftdicht abgeschlossen ist, wird der volumetrische Wirkungsgrad der Vakuumpumpe erhöht. Als Lagervorrichtung ist insbesondere ein Wälzlager geeignet, das günstig herstellbar und einfach in der Montage ist, und aufgrund der besonderen Ausführung der Gehäusewandung mit mindestens einer Durchtrittsöffnung nicht mehr dem hohen Druckunterschied ausgesetzt ist, der zu einem Fettverlust des Wälzlagers führen würde. In vorteilhafter Weise kann zwischen der Gehäusewandung und einem zweiten Zylinderwandstück eine Anlaufscheibe für das Rotorelement vorgesehen sein.The fact that the housing assembly is hermetically sealed, the volumetric efficiency of the vacuum pump is increased. As a bearing device in particular a rolling bearing is suitable, which is inexpensive to manufacture and easy to install, and is no longer exposed to the high pressure difference due to the particular design of the housing with at least one passage opening, which would lead to a loss of grease of the bearing. In an advantageous manner, a thrust washer for the rotor element can be provided between the housing wall and a second cylinder wall piece.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben.An embodiment of the invention is illustrated in the drawing and will be described below.

Hierbei zeigt:

  • Figur 1 eine Schnittansicht einer erfindungsgemäßen Vakuumpumpe, und
  • Figur 2 eine perspektivische Ansicht auf ein Motorgehäuse der Vakuumpumpe aus Fig. 1.
Hereby shows:
  • FIG. 1 a sectional view of a vacuum pump according to the invention, and
  • FIG. 2 a perspective view of a motor housing of the vacuum pump Fig. 1 ,

Figur 1 zeigt eine elektrische Vakuumpumpe 2 mit einer Gehäuseanordnung 4. Die Gehäuseanordnung 4 besteht im Wesentlichen aus einem Motorgehäuse 6 und einem Rotorgehäuse 8. Im Motorgehäuse 6 ist ein an sich bekannter elektrischer Motor 10 mit einer schematisch dargestellten Steuerelektronik 12 vorgesehen. Der Motor 10 wirkt im vorliegenden Ausführungsbeispiel direkt auf eine Rotorwelle 14. Es ist natürlich auch denkbar, dass die Rotorwelle 14 mehrteilig ausgeführt ist, oder dass eine Antriebswelle des Motors 10 über eine Kupplung mit einer Rotorwelle 14 verbunden ist. FIG. 1 shows an electric vacuum pump 2 with a housing assembly 4. The housing assembly 4 consists essentially of a motor housing 6 and a rotor housing 8. In the motor housing 6, a per se known electric motor 10 is provided with a control electronics 12 shown schematically. The motor 10 acts in the present embodiment directly on a rotor shaft 14. It is of course also conceivable that the rotor shaft 14 is designed in several parts, or that a drive shaft of the motor 10 is connected via a coupling with a rotor shaft 14.

Das Motorgehäuse 6 weist am vom Rotorgehäuse 8 abgewandten Ende ein Deckelelement 16 auf, auf dem die Steuereinheit 12 für den elektronisch kommutierten Motor 10 angeordnet ist und das ein erstes Wälzlager 18 zur Lagerung der Rotorwelle 14 aufweist. Es sollte jedoch deutlich sein, dass der Motor 10 auch als herkömmlich, mechanisch kommutierter Motor ausgeführt sein kann. Am entgegengesetzten Ende ist eine Gehäusewandung 20 vorgesehen, die zusammen mit dem Deckelelement 16 und einem Zylinderwandstück 22 das Motorgehäuse 6 luftdicht verschließt. Die Gehäusewandung 20 weist nach außen gerichtete Befestigungsflansche 24 auf zur Befestigung der Vakuumpumpe im Motorraum. Des Weiteren bildet die Gehäusewandung 20 ein Teil des Rotorgehäuses 8, das sich in Längsrichtung an das Motorgehäuse 6 anschließt und ebenfalls durch diese Gehäusewandung 20 luftdicht verschlossen ist. Die Gehäusewandung 20 ist also im vorliegenden Ausführungsbeispiel sowohl ein Teil des Motorgehäuses 6 als auch ein Teil des Rotorgehäuses 8. Des Weiteren weist auch das Rotorgehäuse 8 ein zweites Deckelelement 26 sowie ein zweites Zylinderwandstück 28 auf, wobei zwischen der Gehäusewandung 20 und dem zweiten Zylinderwandstück 28 eine Anlaufscheibe 21 aus Edelstahl für ein Rotorelement 32 angeordnet ist. Das zweite Deckelelement 26 ist über Durchsteckschrauben 30, die durch das zweite Zylinderwandstück 28 reichen, mit der Gehäusewandung 20 verschraubt. Auch das Rotorgehäuse 8 ist fluiddicht abgeschlossen. Des Weiteren weist das Rotorgehäuse 8 auf bekannte Weise einen Einlass und einen Auslass auf, die in dieser Darstellung nicht weiter gezeigt sind. Die Rotorwelle 14 weist das Rotorelement 32 auf, das im vorliegenden Fall mehrere verschiebbar angeordnete Flügelelemente aufweist und dementsprechend die Vakuumpumpe als Flügelzellenpumpe ausgebildet ist. Das Rotorelement 32 wirkt auf bekannte Weise mit dem zweiten zylindrischen Gehäuseteil 28 zusammen und sorgt dementsprechend für den Unterdruckaufbau. In der Gehäusewandung 20 ist ein zweites Wälzlager 34 angeordnet, in dem die Rotorwelle 14 ebenfalls gelagert ist und durch das die Rotorwelle 14 in das Rotorgehäuse 8 hineinreicht.The motor housing 6 has, at the end remote from the rotor housing 8, a cover element 16 on which the control unit 12 for the electronically commutated motor 10 is arranged and which has a first rolling bearing 18 for supporting the rotor shaft 14. It should be understood, however, that the engine 10 may be implemented as a conventional mechanically commutated engine. At the opposite end a housing wall 20 is provided, which closes the motor housing 6 airtight together with the cover member 16 and a cylinder wall piece 22. The housing wall 20 has outwardly directed mounting flanges 24 for mounting the vacuum pump in the engine compartment. Furthermore, the housing wall 20 forms a part of the rotor housing 8, which adjoins the motor housing 6 in the longitudinal direction and is likewise hermetically sealed by this housing wall 20. The housing wall 20 is thus in the present embodiment both a part of the motor housing 6 and a part of the rotor housing 8. Furthermore, the rotor housing 8, a second cover member 26 and a second cylinder wall piece 28, wherein between the housing 20 and the housing second cylinder wall piece 28 a thrust washer 21 made of stainless steel for a rotor element 32 is arranged. The second cover element 26 is bolted to the housing wall 20 via through-bolts 30, which extend through the second cylinder wall piece 28. Also, the rotor housing 8 is closed fluid-tight. Furthermore, the rotor housing 8 in known manner an inlet and an outlet, which are not shown in this illustration. The rotor shaft 14 has the rotor element 32, which in the present case has a plurality of displaceably arranged wing elements and, accordingly, the vacuum pump is designed as a vane cell pump. The rotor element 32 cooperates in a known manner with the second cylindrical housing part 28 and accordingly provides for the vacuum build-up. In the housing wall 20, a second rolling bearing 34 is arranged, in which the rotor shaft 14 is also mounted and through which the rotor shaft 14 extends into the rotor housing 8.

Des Weiteren weist die Gehäusewandung 20 drei Durchtrittsöffnungen 36 auf, die direkt im Bereich des Wälzlagers 34 angeordnet sind. Auf diese Weise ist eine fluidische Verbindung zwischen dem Rotorgehäuse und dem Motorgehäuse 6 vorgesehen, so dass im Bereich der Wälzlagervorrichtung 34 kein für das Wälzlager 34 schädlicher Druckunterschied anliegt.Furthermore, the housing wall 20 has three passage openings 36, which are arranged directly in the region of the roller bearing 34. In this way, a fluidic connection between the rotor housing and the motor housing 6 is provided, so that in the area of the rolling bearing device 34 no harm to the rolling bearing 34 harmful pressure difference.

Figur 2 zeigt das Motorgehäuse 6 in einer perspektivischen Ansicht. Deutlich zu erkennen ist die Gehäusewandung 20 mit den Flanschelementen 24, über die die Vakuumpumpe im Motorraum des Kraftfahrzeuges befestigt werden kann. Die Rotorwelle 14 ist in dem Wälzlager 34 gelagert und reicht durch die Gehäusewandung 20 hindurch in den nicht weiter dargestellten Rotorraum des Rotorgehäuses 8. Deutlich zu erkennen sind auch die Durchtrittsöffnungen 36, die den Druckausgleich im Bereich des Wälzlagers 34 gewährleisten. FIG. 2 shows the motor housing 6 in a perspective view. Clearly visible is the housing wall 20 with the flange elements 24, via which the vacuum pump can be fastened in the engine compartment of the motor vehicle. The rotor shaft 14 is mounted in the rolling bearing 34 and extends through the housing 20 through into the rotor space of the rotor housing 8, not shown. Clearly visible are the passage openings 36 which ensure the pressure equalization in the region of the rolling bearing 34.

Es sollte deutlich sein, dass die Erfindung nicht auf die Ausführung als Flügelzellenpumpe mit mehreren Flügeln beschränkt ist und insbesondere auch beispielsweise bei einer Einflügel-Vakuumpumpe anwendbar ist.It should be understood that the invention is not limited to the embodiment of a multi-vane vane pump, and is particularly applicable to, for example, a single-vane vacuum pump.

Claims (4)

  1. Vacuum pump for use in the automotive sector comprising a rotor element (32) fastened on a rotor shaft (14), the rotor element being arranged in a rotor housing (8), and comprising an electric drive means (10) arranged in a motor housing (6), the means driving the rotor shaft indirectly or directly, wherein the rotor housing (8) and the motor housing (6) are connected with each other via a housing wall (20) and form a housing arrangement (4), wherein the rotor shaft (14) is supported in the housing wall (20) by means of a bearing device (34), and wherein the rotor housing (8) has at least one inlet and one outlet, wherein the housing wall (20) is provided with at least one passage opening (36) fluidically connecting the rotor housing and the motor housing, characterized in that the at least one passage opening (36) is provided directly in the region of the bearing device (34) between the bearing device (34) and the housing wall (20).
  2. Vacuum pump of claim 1, characterized in that the housing arrangement (4) is sealed in an airtight manner.
  3. Vacuum pump of one of claims 1-2, characterized in that the bearing device (34) is a roller bearing.
  4. Vacuum pump of one of the preceding claims, characterized in that a thrust washer (21) for the rotor element (32) is provided between the housing wall (20) and a second cylinder wall part (28).
EP11730666.2A 2011-07-08 2011-07-08 Vacuum pump for use in the automotive sector Active EP2729667B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/061628 WO2013007278A1 (en) 2011-07-08 2011-07-08 Vacuum pump for use in the automotive sector

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Publication Number Publication Date
EP2729667A1 EP2729667A1 (en) 2014-05-14
EP2729667B1 true EP2729667B1 (en) 2017-06-07

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EP11730666.2A Active EP2729667B1 (en) 2011-07-08 2011-07-08 Vacuum pump for use in the automotive sector

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US (1) US20140161647A1 (en)
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US20140161647A1 (en) 2014-06-12
JP2014521002A (en) 2014-08-25
CN103649464A (en) 2014-03-19
EP2729667A1 (en) 2014-05-14
JP6165139B2 (en) 2017-07-19
WO2013007278A1 (en) 2013-01-17
CN103649464B (en) 2016-08-24

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