EP3374640B1 - Electric automotive vacuum pump - Google Patents

Electric automotive vacuum pump Download PDF

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Publication number
EP3374640B1
EP3374640B1 EP15794896.9A EP15794896A EP3374640B1 EP 3374640 B1 EP3374640 B1 EP 3374640B1 EP 15794896 A EP15794896 A EP 15794896A EP 3374640 B1 EP3374640 B1 EP 3374640B1
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EP
European Patent Office
Prior art keywords
pump
opening
outlet
inlet
rotor
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EP15794896.9A
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German (de)
French (fr)
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EP3374640A1 (en
Inventor
Nabil Salim AL-HASAN
Tobias GRÜNE
Sebastian Cramer
Stanislaus Russ
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Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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    • 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
    • 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
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/04—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for reversible pumps

Definitions

  • the present invention relates to an electric automotive vacuum pump with a brushless, electronically commutated, sensorless drive motor.
  • the electric vehicle vacuum pump has a pump housing which forms a pump chamber in which a pump rotor rotates in a compressive manner.
  • the pump rotor can be rotated in both a forward and reverse direction.
  • the electric automotive vacuum pump further has outlet and inlet openings for a forward and a reverse direction of rotation of the rotor.
  • a vacuum pump is known that is driven by an electronically commutated brushless motor with position sensors.
  • a stationary electric compressor is known as part of a heat pump, where the compressor can be operated in both directions in order to be able to use the heat pump for both cooling and heating.
  • An electric vehicle vacuum pump generates a negative pressure of, for example, absolute 100 millibars in a motor vehicle (motor vehicle), regardless of the operating state of an internal combustion engine, which is required, for example, to operate a pneumatic brake booster and/or other pneumatically operated auxiliary units.
  • the electrical power of the drive motor is typically in the range of 100 W for small vacuum pumps and several 100 W for large vacuum pumps.
  • the preferred drive motor is due to the low manufacturing costs compared to electronically commutated motors Brush motors used.
  • the constant grinding contact of the brushes on the slip ring results in wear and a large amount of heat.
  • a brush motor therefore has a limited maximum running time.
  • the object of the present invention is therefore to create an electric vehicle vacuum pump which has a longer running time and, despite all this, can be produced inexpensively.
  • the drive motor is formed by a brushless, electronically commutated, sensorless drive motor.
  • Sensors in the sense of the invention are understood here to be sensors which are generally used for brushless, electronically commutated drive motors in order to detect the position of the rotor, particularly when the drive motor is started.
  • these sensors are not used, so that costs can be saved in this regard.
  • the vacuum pump or the drive motor is sensorless with regard to commutation, i.e. without rotor position sensors. As a result, there is a fundamental risk that the rotor can be moved in both directions.
  • the outlet opening is provided in the direction of rotation of the rotor directly in front of a separating section in which the pump rotor rests fluidly sealingly against a pump chamber wall. This allows a maximum amount of fluid to be pumped out.
  • the efficiency of the vacuum pump is high in both directions of rotation.
  • the inlet opening is provided in the direction of rotation immediately after a separating section in which the pump rotor rests fluidly sealingly against a pump chamber wall. This allows a maximum amount of fluid to be sucked in. This increases the efficiency of the vacuum pump.
  • the forward exhaust port and the reverse inlet port are formed by a single opening.
  • a division of the flow paths into inlet flow and outlet flow is provided behind the opening, viewed in the outlet direction.
  • only a single opening is provided in an end wall of the pump housing for the forward outlet opening and the reverse inlet opening.
  • the forward inlet opening and the reverse outlet opening are formed by a single opening.
  • a division of the flow paths into inlet flow and outlet flow is only provided behind the opening, viewed in the outlet direction.
  • only a single opening is provided in an end wall of the pump housing for the forward inlet opening and the reverse outlet opening.
  • the separating section is preferably designed as an oscillating gap.
  • a circumferential section is used as an oscillating gap in the sense of the invention Pump room wall understood, which is in contact with an outer rotor surface and has the same radius as the rotor. This has the advantage that a fluidic seal between the rotor and the pump chamber wall is not only linear, but is created over a surface, so that an improved fluidic seal is achieved.
  • the vacuum pump is an oil-lubricated pump.
  • oil lubrication improves pneumatic sealing or pneumatic efficiency and reduces wear.
  • the vacuum pump is designed as a dry-running pump. Dry-running in the sense of the invention means that the rotor is not lubricated with oil. This has the advantage that no additional oil supply has to be provided for operation and that no oil has to be separated from the compressed fluid.
  • the pump has at least one slider which forms two blades.
  • the pump has five blades which are formed by five slides.
  • the slide of the pump is preferably made of plastic.
  • Plastic has the advantage that it is easy and inexpensive to produce.
  • the slider is made from a graphite-based material.
  • an electric vehicle vacuum pump 10 is shown, which is used to provide a vacuum with an absolute pressure of, for example, 100 millibars and lower in a motor vehicle.
  • the vacuum is mainly used as potential energy for actuators, for example for a pneumatic brake booster or other pneumatic automotive actuators.
  • An electric drive for vehicle vacuum pumps is increasingly required because the vehicle internal combustion engine does not run constantly during vehicle operation.
  • the electric vehicle vacuum pump 10 has a pump housing 12 and a brushless, electronically commutated, sensorless drive motor 13.
  • This drive motor 13 drives, via a shaft 14, a pump rotor 18 provided in a pump chamber 16 formed by the pump housing 12.
  • Two fluid inlet lines 20 1 , 20 2 and two fluid outlet lines 22 1 , 22 2 are formed in the pump housing 12.
  • the two fluid outlet lines 22 1 , 22 2 are brought together in the outlet direction in the pump housing 12 to form a common overall fluid outlet line 24.
  • the two fluid inlet lines 20 1 , 20 2 are branched in the inlet direction in the pump housing 12 from a total fluid inlet line 26.
  • outlet check valves 28 1 , 28 2 in the outlet direction before the lines are brought together which block in an inlet direction and release a fluid flow in an outlet direction.
  • an inlet check valve 30 1 , 30 2 is provided, which blocks in an outlet direction and releases a fluid flow in an inlet direction.
  • FIG 2 shows the pump housing 12 with the pump chamber 16 formed therein.
  • the pump rotor 18 is provided eccentrically to the pump chamber 16, which can be rotated in both a forward and a backward direction.
  • the forward direction is a direction of rotation of the in Figure 2 pump rotor 18 shown, which rotates counterclockwise. Accordingly, a direction of rotation of the in Figure 2 shown pump rotor 18 clockwise in a reverse direction.
  • This pump rotor 18 is designed as a rotary valve.
  • the rotary slide is formed from a rotor body 32 and a slide 34, which can be moved orthogonally to a rotation axis 33 of the pump rotor 18 through a center of the rotor body 32 and forms two blades.
  • the slide 34 has ends 36, which form the wing ends and are in constant contact with a pump chamber wall 38 during the rotation of the pump rotor 18.
  • the rotor body 32 is arranged eccentrically in the pump chamber 16 in such a way that a rotor outer surface 40 of the pump rotor 18 rests in a fluid sealing manner against the pump chamber wall 38 and thus forms a separating section 42.
  • a single kidney-shaped opening 46, 47 is provided immediately before and after the separating section 42, which serves as either an inlet or an outlet opening 46, 47 depending on the direction of travel of the pump rotor 18.
  • Each opening 46, 47 is fluidly connected to a pump inlet 48 via one of the fluid inlet lines 20 1 , 20 2 .
  • Every opening 46, 47 is also fluidly connected to a pump outlet 49 via one of the fluid outlet lines 22 1 , 22 2 .

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

Description

Die vorliegende Erfindung betrifft eine elektrische Kfz-Vakuumpumpe mit einem bürstenlosen, elektronisch kommutierten, sensorlosen Antriebsmotor.The present invention relates to an electric automotive vacuum pump with a brushless, electronically commutated, sensorless drive motor.

Die elektrische Kfz-Vakuumpumpe weist ein Pumpengehäuse auf, welches einen Pumpraum ausbildet, in welchem ein Pumpenrotor verdichtend rotiert. Der Pumpenrotor ist sowohl in einer Vorwärts- als auch in einer Rückwärtsdrehrichtung rotierbar. Die elektrische Kfz-Vakuumpumpe weist weiter Auslass- und Einlassöffnungen für eine Vorwärts- und eine Rückwärtsdrehrichtung des Rotors auf.The electric vehicle vacuum pump has a pump housing which forms a pump chamber in which a pump rotor rotates in a compressive manner. The pump rotor can be rotated in both a forward and reverse direction. The electric automotive vacuum pump further has outlet and inlet openings for a forward and a reverse direction of rotation of the rotor.

Aus US 2005/260082 A1 ist eine Vakuumpumpe bekannt, die mit einem elektronisch kommutierten bürstenlosen Motor mit Positionssensoren angetrieben wird.Out of US 2005/260082 A1 A vacuum pump is known that is driven by an electronically commutated brushless motor with position sensors.

Aus US 7 491 037 B2 ist ein stationärer elektrischer Kompressor als Teil einer Wärmepumpe bekannt, wobei der Kompressor in beide Richtungen betrieben werden kann, um die Wärmepumpe sowohl zur Kühlung als auch zur Heizung nutzen zu können.Out of US 7,491,037 B2 A stationary electric compressor is known as part of a heat pump, where the compressor can be operated in both directions in order to be able to use the heat pump for both cooling and heating.

Eine elektrische Kfz-Vakuumpumpe generiert in einem Kraftfahrzeug (Kfz) unabhängig von dem Betriebszustand eines Verbrennungsmotors einen Unterdruck von beispielsweise absolut 100 Millibar, der beispielsweise zum Betrieb eines pneumatischen Bremskraftverstärkers und/oder anderer pneumatisch betriebener Nebenaggregate benötigt wird. Bei einer elektrischen Kfz-Vakuumpumpe liegt die elektrische Leistung des Antriebsmotors typischerweise im Bereich von 100 W bei kleinen Vakuumpumpen und bei mehreren 100 W bei großen Vakuumpumpen.An electric vehicle vacuum pump generates a negative pressure of, for example, absolute 100 millibars in a motor vehicle (motor vehicle), regardless of the operating state of an internal combustion engine, which is required, for example, to operate a pneumatic brake booster and/or other pneumatically operated auxiliary units. In an electric automotive vacuum pump, the electrical power of the drive motor is typically in the range of 100 W for small vacuum pumps and several 100 W for large vacuum pumps.

Als Antriebsmotor werden aufgrund der im Vergleich zu elektronisch kommutierten Motoren geringen Herstellungskosten, bevorzugt Bürstenmotoren verwendet. Durch den ständig schleifenden Kontakt der Bürsten an dem Schleifring ergeben sich Verschleiß und eine große Hitzeentwicklung. Ein Bürstenmotor hat daher eine begrenzte maximale Laufzeit.The preferred drive motor is due to the low manufacturing costs compared to electronically commutated motors Brush motors used. The constant grinding contact of the brushes on the slip ring results in wear and a large amount of heat. A brush motor therefore has a limited maximum running time.

Die Aufgabe der vorliegenden Erfindung liegt somit darin, eine elektrische Kfz-Vakuumpumpe zu schaffen, welche eine höhere Laufzeit aufweist und trotz alledem preiswert herstellbar ist.The object of the present invention is therefore to create an electric vehicle vacuum pump which has a longer running time and, despite all this, can be produced inexpensively.

Diese Aufgabe wird durch eine elektrische Kfz-Vakuumpumpe nach dem unabhängigen Anspruch 1 gelöst.This task is solved by an electric vehicle vacuum pump according to independent claim 1.

Bei dieser elektrischen Kfz-Vakuumpumpe ist der Antriebsmotor durch einen bürstenlosen, elektronisch kommutierten, sensorlosen Antriebsmotor gebildet. Als Sensoren im Sinne der Erfindung werden hier Sensoren verstanden, welche in der Regel für bürstenlose, elektronisch kommutierte Antriebsmotoren verwendet werde, um die Lage des Rotors insbesondere bei einem Start des Antriebsmotors zu detektieren. Bei der vorliegenden Erfindung werden diese Sensoren jedoch nicht verwendet, so dass in dieser Hinsicht Kosten dafür eingespart werden können. Die Vakuumpumpe bzw. der Antriebsmotor ist bezüglich der Kommutierung sensorlos, also ohne Rotorpositionssensoren ausgestattet. Als Folge davon besteht grundsätzlich die Gefahr, dass der Rotor in beide Drehrichtungen angefahren werden kann.In this electric vehicle vacuum pump, the drive motor is formed by a brushless, electronically commutated, sensorless drive motor. Sensors in the sense of the invention are understood here to be sensors which are generally used for brushless, electronically commutated drive motors in order to detect the position of the rotor, particularly when the drive motor is started. However, in the present invention, these sensors are not used, so that costs can be saved in this regard. The vacuum pump or the drive motor is sensorless with regard to commutation, i.e. without rotor position sensors. As a result, there is a fundamental risk that the rotor can be moved in both directions.

Gelöst wird dieses Problem dadurch, dass sowohl für eine Vorwärts- als auch Rückwärtsdrehrichtung Einlass- und Auslassöffnungen vorgesehen sind. Da die elektrische Vakuumpumpe vorzugsweise symmetrisch aufgebaut ist, ist der Wirkungsgrad der Vakuumpumpe in der Vorwärts- und der Rückwärtsdrehrichtung gleich. Da ein elektronisch kommutierter Antriebsmotor ohne Kontakt zu dem Rotor arbeitet, sind kein mechanischer Verschleiß und keine Kommutator-Wärmeentwicklung vorhanden. Die Lebensdauer der elektrischen Vakuumpumpe wird damit, trotz geringer Kosten, erheblich gesteigert.This problem is solved by providing inlet and outlet openings for both forward and reverse directions of rotation. Since the electric vacuum pump is preferably constructed symmetrically, the efficiency of the vacuum pump is the same in the forward and reverse directions of rotation. Since an electronically commutated drive motor works without contact with the rotor, there is no mechanical wear and no commutator heat generation available. The service life of the electric vacuum pump is therefore significantly increased, despite the low cost.

Die Auslassöffnung ist in Rotationsrichtung des Rotors unmittelbar vor einem Trennabschnitt vorgesehen, in welchem der Pumpenrotor fluidisch abdichtend an einer Pumpraum-Wand anliegt. Hierdurch kann eine maximale Fluidmenge ausgefördert werden. Der Wirkungsgrad der Vakuumpumpe ist in beiden Drehrichtungen hoch.The outlet opening is provided in the direction of rotation of the rotor directly in front of a separating section in which the pump rotor rests fluidly sealingly against a pump chamber wall. This allows a maximum amount of fluid to be pumped out. The efficiency of the vacuum pump is high in both directions of rotation.

Die Einlassöffnung ist in Rotationsrichtung unmittelbar nach einem Trennabschnitt vorgesehen, in welchem der Pumpenrotor fluidisch abdichtend an einer Pumpraum-Wand anliegt. Hierdurch kann eine maximale Fluidmenge angesaugt werden. Der Wirkungsgrad der Vakuumpumpe wird damit gesteigert.The inlet opening is provided in the direction of rotation immediately after a separating section in which the pump rotor rests fluidly sealingly against a pump chamber wall. This allows a maximum amount of fluid to be sucked in. This increases the efficiency of the vacuum pump.

Die Vorwärts-Auslassöffnung und die Rückwärts-Einlassöffnung sind durch eine einzige Öffnung gebildet. Eine Aufteilung der Strömungswege in Einlassströmung und Auslassströmung ist, gesehen in Auslassrichtung, hinter der Öffnung vorgesehen. Hierdurch ist für die Vorwärts-Auslassöffnung und die Rückwärts-Einlassöffnung lediglich eine einzige Öffnung in einer Stirnwand des Pumpengehäuses vorgesehen.The forward exhaust port and the reverse inlet port are formed by a single opening. A division of the flow paths into inlet flow and outlet flow is provided behind the opening, viewed in the outlet direction. As a result, only a single opening is provided in an end wall of the pump housing for the forward outlet opening and the reverse inlet opening.

Die Vorwärts-Einlassöffnung und die Rückwärts-Auslassöffnung sind durch eine einzige Öffnung gebildet. Eine Aufteilung der Strömungswege in Einlassströmung und Auslassströmung ist, gesehen in Auslassrichtung, erst hinter der Öffnung vorgesehen. Hierdurch ist für die Vorwärts-Einlassöffnung und die Rückwärts-Auslassöffnung lediglich eine einzige Öffnung in einer Stirnwand des Pumpengehäuses vorgesehen.The forward inlet opening and the reverse outlet opening are formed by a single opening. A division of the flow paths into inlet flow and outlet flow is only provided behind the opening, viewed in the outlet direction. As a result, only a single opening is provided in an end wall of the pump housing for the forward inlet opening and the reverse outlet opening.

Vorzugsweise ist der Trennabschnitt als Schmiegespalt ausgebildet. Als Schmiegespalt im Sinne der Erfindung wird ein Umfangs-Abschnitt in der Pumpraum-Wand verstanden, welcher in Kontakt mit einer Rotoraußenfläche ist und den gleichen Radius wie der Rotor aufweist. Dies hat den Vorteil, dass eine fluidische Abdichtung zwischen Rotor und Pumpraum-Wand nicht nur linienförmig, sondern über eine Fläche hergestellt ist, so dass eine verbesserte fluidische Abdichtung bewirkt wird.The separating section is preferably designed as an oscillating gap. A circumferential section is used as an oscillating gap in the sense of the invention Pump room wall understood, which is in contact with an outer rotor surface and has the same radius as the rotor. This has the advantage that a fluidic seal between the rotor and the pump chamber wall is not only linear, but is created over a surface, so that an improved fluidic seal is achieved.

In einem bevorzugten Ausführungsbeispiel der Erfindung ist die Vakuumpumpe eine ölgeschmierte Pumpe. Eine solche Pumpe hat den Vorteil, dass diese Pumpe aufgrund der relativ einfachen Ausgestaltung preiswert herstellbar ist. Die Ölschmierung verbessert die pneumatische Abdichtung bzw. den pneumatischen Wirkungsgrad und verringert den Verschleiß.In a preferred embodiment of the invention, the vacuum pump is an oil-lubricated pump. Such a pump has the advantage that this pump can be produced inexpensively due to the relatively simple design. Oil lubrication improves pneumatic sealing or pneumatic efficiency and reduces wear.

Die Vakuumpumpe ist in einem alternativen Ausführungsbeispiel als eine trockenlaufende Pumpe ausgeführt. Unter trockenlaufend im Sinne der Erfindung wird verstanden, dass der Rotor nicht mit Öl geschmiert ist. Dies hat den Vorteil, dass für den Betrieb keine zusätzliche Ölversorgung bereitgestellt werden muss, und dass von dem verdichteten Fluid kein Öl abgetrennt werden muss.In an alternative exemplary embodiment, the vacuum pump is designed as a dry-running pump. Dry-running in the sense of the invention means that the rotor is not lubricated with oil. This has the advantage that no additional oil supply has to be provided for operation and that no oil has to be separated from the compressed fluid.

Die Pumpe weist nach einem bevorzugten Ausführungsbeispiel der Erfindung mindestens einen Schieber auf, der zwei Flügel ausbildet. Alternativ weist die Pumpe nach einem bevorzugten Ausführungsbeispiel der Erfindung fünf Flügel auf, die durch fünf Schieber gebildet sind.According to a preferred embodiment of the invention, the pump has at least one slider which forms two blades. Alternatively, according to a preferred embodiment of the invention, the pump has five blades which are formed by five slides.

Vorzugsweise ist der Schieber der Pumpe aus Kunststoff hergestellt. Kunststoff hat den Vorteil, dass es einfach und preiswert herstellbar ist. In einer alternativen Ausführungsform ist der Schieber aus einem graphitbasierten Werkstoff hergestellt.The slide of the pump is preferably made of plastic. Plastic has the advantage that it is easy and inexpensive to produce. In an alternative embodiment, the slider is made from a graphite-based material.

Weitere Einzelheiten und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung des Ausführungsbeispiels in Verbindung mit den Zeichnungen. In diesen zeigen:

Figur 1:
Schematische Darstellung einer elektrischen Kfz-Vakuumpumpe nach der vorliegenden Erfindung, und
Figur 2:
einen Schnitt durch das Pumpengehäuse der elektrischen Kfz-Vakuumpumpe nach Fig. 1.
Further details and advantages of the present invention emerge from the following description of the exemplary embodiment in conjunction with the drawings. Show in these:
Figure 1:
Schematic representation of an electric automotive vacuum pump according to the present invention, and
Figure 2:
a section through the pump housing of the electric vehicle vacuum pump Fig. 1 .

In Figur 1 ist eine elektrische Kfz-Vakuumpumpe 10 dargestellt, die in einem Kraftfahrzeug der Bereitstellung von Vakuum mit einem absoluten Druck von beispielsweise 100 Millibar und niedriger dient. Das Vakuum wird hauptsächlich als potentielle Energie für Aktuatorik genutzt, beispielsweise für einen pneumatischen Bremskraftverstärker oder andere pneumatische Kfz-Aktuatoren. Ein elektrischer Antrieb für Kfz-Vakuumpumpen wird in zunehmendem Maße erforderlich, weil der Kfz-Verbrennungsmotor während des Fahrzeug-Betriebes nicht ständig läuft.In Figure 1 an electric vehicle vacuum pump 10 is shown, which is used to provide a vacuum with an absolute pressure of, for example, 100 millibars and lower in a motor vehicle. The vacuum is mainly used as potential energy for actuators, for example for a pneumatic brake booster or other pneumatic automotive actuators. An electric drive for vehicle vacuum pumps is increasingly required because the vehicle internal combustion engine does not run constantly during vehicle operation.

Die elektrischen Kfz-Vakuumpumpe 10 weist ein Pumpengehäuse 12 und einen bürstenlosen, elektronisch kommutierten, sensorlosen Antriebsmotor 13 auf, Dieser Antriebsmotor 13 treibt über eine Welle 14 einen in einem durch das Pumpengehäuse 12 ausgebildeten Pumpraum 16 vorgesehenen Pumpenrotor 18 an. In dem Pumpengehäuse 12 sind zwei Fluideinlassleitungen 201, 202 und zwei Fluidauslassleitungen 221, 222 ausgebildet. Die beiden Fluidauslassleitungen 221, 222 sind in Auslassrichtung in dem Pumpengehäuse 12 zu einer gemeinsamen Gesamtfluidauslassleitung 24 zusammengeführt. Die beiden Fluideinlassleitungen 201, 202 werden in Einlassrichtung in dem Pumpengehäuse 12 aus einer Gesamtfluideinlassleitung 26 verzweigt.The electric vehicle vacuum pump 10 has a pump housing 12 and a brushless, electronically commutated, sensorless drive motor 13. This drive motor 13 drives, via a shaft 14, a pump rotor 18 provided in a pump chamber 16 formed by the pump housing 12. Two fluid inlet lines 20 1 , 20 2 and two fluid outlet lines 22 1 , 22 2 are formed in the pump housing 12. The two fluid outlet lines 22 1 , 22 2 are brought together in the outlet direction in the pump housing 12 to form a common overall fluid outlet line 24. The two fluid inlet lines 20 1 , 20 2 are branched in the inlet direction in the pump housing 12 from a total fluid inlet line 26.

In den beiden Fluidauslassleitungen 221, 222 sind in Auslassrichtung vor der Zusammenführung der Leitungen Auslass-Rückschlagventile 281, 282 vorgesehen, welche in einer Einlassrichtung sperren und in einer Auslassrichtung eine Fluidströmung freigeben. Ebenso ist im Vorlauf jeder der beiden Fluideinlassleitungen 201, 202 in Einlassrichtung nach der Verzweigung der Gesamtfluideinlassleitung 26 jeweils ein Einlass-Rückschlagventil 301, 302 vorgesehen, welche in einer Auslassrichtung sperren und in einer Einlassrichtung eine Fluidströmung freigeben.In the two fluid outlet lines 22 1 , 22 2 there are outlet check valves 28 1 , 28 2 in the outlet direction before the lines are brought together provided, which block in an inlet direction and release a fluid flow in an outlet direction. Likewise, in the flow of each of the two fluid inlet lines 20 1 , 20 2 in the inlet direction after the branching of the overall fluid inlet line 26, an inlet check valve 30 1 , 30 2 is provided, which blocks in an outlet direction and releases a fluid flow in an inlet direction.

Figur 2 zeigt das Pumpengehäuse 12 mit dem darin ausgebildeten Pumpraum 16. In dem Pumpraum 16 ist exzentrisch zum Pumpraum 16 der Pumpenrotor 18 vorgesehen, welcher sowohl in einer Vorwärts- als auch in einer Rückwärtsrichtung rotierbar ist. Als Vorwärtsrichtung wird eine Drehrichtung des in Figur 2 gezeigten Pumpenrotors 18 verstanden, welche entgegen dem Uhrzeigersinn dreht. Dementsprechend ist eine Drehrichtung des in Figur 2 gezeigten Pumpenrotors 18 im Uhrzeigersinn eine Rückwärtsrichtung. Dieser Pumpenrotor 18 ist als Drehschieber ausgebildet. Der Drehschieber ist gebildet aus einem Rotorkörper 32 und einem Schieber 34, welcher orthogonal zu einer Drehachse 33 des Pumpenrotors 18 durch eine Mitte des Rotorkörpers 32 bewegbar ist und zwei Flügel bildet. Der Schieber 34 weist Enden 36 auf, welche die Flügelenden bilden und während der Rotation des Pumpenrotors 18 in einem ständigen Kontakt mit einer Pumpraum-Wand 38 sind. Figure 2 shows the pump housing 12 with the pump chamber 16 formed therein. In the pump chamber 16, the pump rotor 18 is provided eccentrically to the pump chamber 16, which can be rotated in both a forward and a backward direction. The forward direction is a direction of rotation of the in Figure 2 pump rotor 18 shown, which rotates counterclockwise. Accordingly, a direction of rotation of the in Figure 2 shown pump rotor 18 clockwise in a reverse direction. This pump rotor 18 is designed as a rotary valve. The rotary slide is formed from a rotor body 32 and a slide 34, which can be moved orthogonally to a rotation axis 33 of the pump rotor 18 through a center of the rotor body 32 and forms two blades. The slide 34 has ends 36, which form the wing ends and are in constant contact with a pump chamber wall 38 during the rotation of the pump rotor 18.

Der Rotorkörper 32 ist derart exzentrisch in dem Pumpraum 16 angeordnet, dass eine Rotoraußenfläche 40 des Pumpenrotors 18 fluidisch abdichtend an der Pumpraum-Wand 38 anliegt, und damit einen Trennabschnitt 42 ausbildet.The rotor body 32 is arranged eccentrically in the pump chamber 16 in such a way that a rotor outer surface 40 of the pump rotor 18 rests in a fluid sealing manner against the pump chamber wall 38 and thus forms a separating section 42.

In einer Stirnwand 44 des Pumpengehäuses 12 ist unmittelbar vor und nach dem Trennabschnitt 42 jeweils eine einzige nierenförmige Öffnung 46, 47 vorgesehen, welche in Abhängigkeit von der Laufrichtung des Pumpenrotors 18 entweder als Einlass- oder als Auslassöffnung 46, 47 dient. Jede Öffnung 46, 47 ist über jeweils eine der Fluideinlassleitungen 201, 202 mit einem Pumpeneinlass 48 fluidisch verbunden. Jede Öffnung 46, 47 ist zudem über jeweils eine der Fluidauslassleitungen 221, 222 mit einem Pumpenauslass 49 fluidisch verbunden. Bei einer Rotation des Pumpenrotors 18 dient die Öffnung 46, 47, welche in Rotationsrichtung unmittelbar vor dem Trennabschnitt 42 liegt, als Auslassöffnung und die Öffnung 46, 47, die in Rotationsrichtung unmittelbar nach dem Trennabschnitt liegt, als Eintrittsöffnung. Durch Vorsehen der Rückschlagventile 28, 30 werden Rückströme unterbunden.In an end wall 44 of the pump housing 12, a single kidney-shaped opening 46, 47 is provided immediately before and after the separating section 42, which serves as either an inlet or an outlet opening 46, 47 depending on the direction of travel of the pump rotor 18. Each opening 46, 47 is fluidly connected to a pump inlet 48 via one of the fluid inlet lines 20 1 , 20 2 . Every opening 46, 47 is also fluidly connected to a pump outlet 49 via one of the fluid outlet lines 22 1 , 22 2 . When the pump rotor 18 rotates, the opening 46, 47, which lies immediately in front of the separating section 42 in the direction of rotation, serves as an outlet opening and the opening 46, 47, which lies immediately after the separating section in the direction of rotation, serves as an inlet opening. By providing check valves 28, 30, backflows are prevented.

BezugszeichenlisteReference symbol list

1010
elektrischen Kfz-Vakuumpumpeelectric vehicle vacuum pump
1212
PumpengehäusePump housing
1313
Antriebsmotordrive motor
1414
WelleWave
1616
PumpraumPump room
1818
Pumpenrotorpump rotor
201, 202201, 202
FluideinlassleitungenFluid inlet lines
221, 222221, 222
FluidauslassleitungenFluid outlet lines
2424
GesamtfluidauslassleitungTotal fluid outlet line
2626
GesamtfluideinlassleitungTotal fluid inlet line
281, 282281, 282
Auslass-RückschlagventileOutlet check valves
301, 302301, 302
Einlass-RückschlagventileInlet check valves
3232
RotorkörperRotor body
3333
DrehachseAxis of rotation
3434
SchieberSlider
3636
Endenend up
3838
Pumpraum-WandPump room wall
4040
RotoraußenflächeRotor outer surface
4242
TrennabschnittSeparating section
4444
StirnwandFront wall
4646
Öffnungopening
4747
Öffnungopening
4848
PumpeneinlassPump inlet
4949
PumpenauslassPump outlet

Claims (3)

  1. Electric automotive vacuum pump (10) comprising:
    a brushless, electronically commutated, sensorless drive motor (13.), further comprising:
    a pump housing (12) configuring a pump chamber (16),
    a pump rotor (18) which rotates in the pump chamber (16) in a compressing manner, wherein the pump rotor (18) is rotatable in a forward and a reverse direction of rotation,
    a single forward outlet opening (47) and a single separate reverse outlet opening (46), which connect the pump chamber (16.) to a pump outlet (49), wherein a non-return valve (281, 282) opening in the outlet direction is provided respectively between the outlet opening (46, 47) and the pump outlet (49), and
    a forward inlet opening (46) and a separate reverse inlet opening (47), which connect the pump chamber (16.) to a pump inlet (48), wherein a non-return valve (301, 302) opening in the inlet direction is provided respectively between the inlet opening (46, 47) and the pump inlet (48), and
    the forward outlet opening and the reverse inlet opening are defined by a single opening (47), the forward inlet opening and the reverse outlet opening are defined by a single opening (46),
    the pump is a rotary vane pump or a vane pump,
    the outlet opening (46, 47) is provided in the direction of rotation directly upstream of a separating section (42), in which the pump rotor (18) abuts against a pump chamber wall (38) in a fluidically sealing manner, and the inlet opening (46, 47) is provided in the direction of rotation directly downstream of a separating section (42), in which the pump rotor (18) abuts against a pump chamber wall (38) in a fluidically sealing manner.
  2. Electric automotive vacuum pump (10) according to claim 1, characterised in that the vacuum pump (10) is an oil-lubricated pump.
  3. Electric automotive vacuum pump (10) according to claim 1, characterised in that the vacuum pump (10) is a dry-running pump.
EP15794896.9A 2015-11-12 2015-11-12 Electric automotive vacuum pump Active EP3374640B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/076406 WO2017080599A1 (en) 2015-11-12 2015-11-12 Electric motor vehicle vacuum pump

Publications (2)

Publication Number Publication Date
EP3374640A1 EP3374640A1 (en) 2018-09-19
EP3374640B1 true EP3374640B1 (en) 2024-03-06

Family

ID=54545126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15794896.9A Active EP3374640B1 (en) 2015-11-12 2015-11-12 Electric automotive vacuum pump

Country Status (2)

Country Link
EP (1) EP3374640B1 (en)
WO (1) WO2017080599A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB564668A (en) * 1943-05-13 1944-10-09 William Wilson Hamill Improvements in gear wheel pumps for liquids
US4598559A (en) * 1985-05-31 1986-07-08 Carrier Corporation Reversible fixed vane rotary compressor having a reversing disk which carries the suction port
AT399922B (en) * 1989-06-05 1995-08-25 Weber Gisela Gear pump for clockwise and anticlockwise operation
US20050260082A1 (en) * 2004-05-18 2005-11-24 Armin Conrad Oil-sealed vane rotary vacuum pump
DE102007022216A1 (en) * 2007-05-11 2008-11-13 Robert Bosch Gmbh Hydraulic system with gear pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7491037B2 (en) * 2005-08-05 2009-02-17 Edwards Thomas C Reversible valving system for use in pumps and compressing devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB564668A (en) * 1943-05-13 1944-10-09 William Wilson Hamill Improvements in gear wheel pumps for liquids
US4598559A (en) * 1985-05-31 1986-07-08 Carrier Corporation Reversible fixed vane rotary compressor having a reversing disk which carries the suction port
AT399922B (en) * 1989-06-05 1995-08-25 Weber Gisela Gear pump for clockwise and anticlockwise operation
US20050260082A1 (en) * 2004-05-18 2005-11-24 Armin Conrad Oil-sealed vane rotary vacuum pump
DE102007022216A1 (en) * 2007-05-11 2008-11-13 Robert Bosch Gmbh Hydraulic system with gear pump

Also Published As

Publication number Publication date
EP3374640A1 (en) 2018-09-19
WO2017080599A1 (en) 2017-05-18

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