EP3482047B1 - Automotive auxiliary assembly vacuum pump having a single-piece flange element - Google Patents

Automotive auxiliary assembly vacuum pump having a single-piece flange element Download PDF

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Publication number
EP3482047B1
EP3482047B1 EP17722457.3A EP17722457A EP3482047B1 EP 3482047 B1 EP3482047 B1 EP 3482047B1 EP 17722457 A EP17722457 A EP 17722457A EP 3482047 B1 EP3482047 B1 EP 3482047B1
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EP
European Patent Office
Prior art keywords
pump
rotor
thrust washer
flange element
vacuum pump
Prior art date
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Active
Application number
EP17722457.3A
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German (de)
French (fr)
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EP3482047A1 (en
Inventor
Nabil Salim AL-HASAN
Tobias GRÜNE
Sebastian Cramer
Steffen Schnurr
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Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Publication of EP3482047A1 publication Critical patent/EP3482047A1/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
    • 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
    • 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
    • F01C21/02—Arrangements of bearings
    • 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
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • 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
    • F04C2220/00—Application
    • F04C2220/10—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
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F04C2220/12—Dry running
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/40—Heat treatment
    • F04C2230/41—Hardening; Annealing
    • 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
    • F04C2240/30—Casings or housings

Definitions

  • the invention relates to a motor vehicle auxiliary unit vacuum pump, which is designed as an electric motor-driven and dry-running vane pump, with a housing assembly that has an electric motor section and a pump section as well as a pump inlet and pump outlet opening, the electric motor section having a motor rotor that rotates radially and is surrounded axially-distally by a motor housing pot, which is closed proximally by an end shield carrying a bearing, the pump section having a pump housing defining a pump chamber with a closing element, the pump housing being surrounded by at least one axial-proximal thrust washer, one axial-distal thrust washer and a radial cam ring is formed, the pump housing having at least one pump chamber inlet opening and at least one pump chamber outlet opening, the motor rotor being aligned coaxially with a pump rotor arranged in the pump chamber, the rotor body of which has at least has at least three rotor blades mounted displaceably on the rotor body.
  • Vacuum pumps are well known from the prior art.
  • the basic structure is, for example, from US 5,149,257A famous.
  • a pump chamber in which a pump rotor is provided, is provided between two housing walls and a cam ring delimiting the pump chamber in the radial direction.
  • auxiliary unit vacuum pumps are used in motor vehicles to supply other units, for example a brake booster, with a vacuum of, for example, 100 millibar absolute and lower and/or with an overpressure.
  • a vacuum for example, 100 millibar absolute and lower and/or with an overpressure.
  • electric motor-driven vacuum pumps are used, which are usually designed as vane pumps with at least three rotor blades.
  • the motor rotor is in a housing pot, which is closed proximally by an end shield that has a radial bearing for supporting the rotor shaft.
  • the end shield On the side facing away from the motor, the end shield is followed by a separate first thrust washer of the pump housing, which together with a second thrust washer and a circular cam ring forms a pump housing that defines or encloses a pump chamber.
  • the pump rotor is arranged in the pump chamber, the rotor body of which has a plurality of rotor blades mounted displaceably therein.
  • the assembly of the vacuum pump is complex because it consists of many parts and the housing pot, the end shield and the cam ring must be precisely aligned axially with each other.
  • a similar solution is from WO 2013/007278 A1 known in which to see a thrust washer between the housing wall delimiting the pump chamber and the pump rotor or cam ring.
  • WO 2013/007278 A1 known in which to see a thrust washer between the housing wall delimiting the pump chamber and the pump rotor or cam ring.
  • such a vacuum pump is expensive to produce since the thrust washer has to be aligned with respect to the cam ring and the housing wall.
  • Dry-running vane pumps are used to save on a lubricant supply and to avoid contamination of the air leaving the vacuum pump. Due to the fact that the dry-running vacuum pump does not need to be lubricated, high demands are placed on the material pairing of the rotor blades/cam ring of the vacuum pump, with excessive wear of the cam ring on which the head of the rotor blade slides having to be avoided in particular.
  • the object of the invention is to reduce the manufacturing costs of a motor vehicle auxiliary unit vacuum pump, to simplify the assembly of such a pump and to further minimize the installation space.
  • bearing plate and the axial-proximal thrust washer are designed as a one-piece flange element and are formed by a single disk body, one side of which forms the bearing plate and the other side of which forms the adjacent thrust washer, with the bearing plate the pump inlet opening and the corresponding pump chamber inlet opening in the axial-proximal thrust washer and the corresponding pump chamber inlet opening in the axial-proximal thrust washer.
  • the end shield and the axial-proximal thrust washer are designed as a one-piece flange element.
  • a flange element is much simpler and therefore cheaper to manufacture.
  • the flange element with bearing shield function closes off the motor housing pot at its axial-proximal end and forms or holds a radial bearing for the rotor shaft.
  • the radial bearing can be a plain bearing or a roller bearing.
  • the bearing plate and the adjoining thrust washer are formed from a single disc body, one side of which forms the bearing plate and the other side of which forms the adjoining thrust washer.
  • the vacuum pump is essential due to the arrangement of the pump inlet opening and/or the pump outlet opening in the flange element to be interpreted more flexibly and the air flow can be significantly simplified.
  • the one-piece flange element is made of aluminum, aluminum components are very light with high stability and, due to the hardening, are also sufficiently protected against wear due to the softer rotor blade head.
  • at least the thrust washer of the one-piece flange element is hardened over its entire surface, preferably anodized. Such a hard anodized layer is hard enough to ensure that the thrust washer is highly wear-resistant.
  • a commutator arrangement of the electric motor section is preferably mounted in the flange element. This positively establishes the coaxiality of the motor section and the pump section. This considerably simplifies assembly and reduces the overall length.
  • the flange element has at least one radial assembly element with an insertion opening for screwing in an assembly screw.
  • the flange element thus has a further additional function which, because it is integrated into a single component, causes only minor additional costs.
  • the flange element has a nozzle element with the pump inlet or pump outlet opening in order to be easily connected to a pressure-controlled component.
  • the pump outlet opening can preferably be provided in the closing element.
  • a motor vehicle auxiliary unit vacuum pump 10 is shown, which is designed as an electric motor-driven and dry-running vane pump.
  • the vacuum pump 10 is used in a motor vehicle, which is driven by an internal combustion engine, for example, as an auxiliary unit for providing a negative pressure of 100 millibars absolute or less.
  • the vacuum pump 10 is operated at a constant nominal speed of approximately 3000 rpm, but can in principle also be operated at a variable speed.
  • the vacuum pump 10 has a housing assembly 11 and is divided functionally and in the longitudinal direction into an electric motor section 12 and a pump section 14 .
  • a rotatably mounted rotor shaft 18 is provided in the electric motor section 12, to which a motor rotor 17 is fastened in a rotationally fixed manner, which motor rotor 17 can, for example, be designed to be permanently magnetically excited.
  • a fixed motor stator 19 having a plurality of stator coils.
  • a motor housing is essentially formed by a motor housing pot 16, which has a bearing recess 15 at its axial-distal end for a bearing designed as a radial bearing 13, which can be designed as a roller bearing, for example.
  • the electric motor section 12 is terminated proximally by an end shield 22 which carries a bearing 25 designed as a radial-axial bearing for supporting the rotor shaft 18 .
  • the radial bearing 25 is designed as a roller bearing, but can in principle also be designed as a plain bearing.
  • the end shield 22 is formed by a disc body 27 which lies in a transverse plane and is part of a one-piece flange element 20 .
  • the housing pot 16 is fastened to an annular flange part 28 of the flange element 20 .
  • On the inside of this ring-shaped A commutator arrangement 33 and electrical components of the electric motor section 12 (not shown in any more detail) are attached to the flange part 28 . In this way, in combination with the integrated end shield 22, coaxiality of the pump section 14 with the electric motor section 12 is ensured in a particularly simple manner.
  • the pump section 14 is formed by the rotor shaft 18, to which an overhung pump rotor 30 is fixed in a rotationally fixed manner, the pump housing 29, which defines a pump chamber 31, and a cover plate 40.
  • the pump rotor 30 has a rotor body 32 with five slidable on the rotor body 32 mounted rotor blades 34, the rotor blade heads are made of graphite and separate several pump cells from each other.
  • the rotor body 32 is fixed to the rotor shaft 18 in a rotationally fixed and axially displaceable manner to a certain extent, so that the pump rotor 30 can always assume an axial position between the two thrust washers 24, 40 that is as friction-free as possible.
  • the pump housing 29 is formed here by the axial-proximal thrust washer 24, the axial-distal thrust washer 40 which is axially opposite the axial-proximal thrust washer 24 in relation to the pump rotor 30 and a cam ring 26, and by a cover plate 50 which is clamped onto the flange element 20 is, covered.
  • a pump chamber inlet opening 42 is provided in the axially proximal thrust washer 24 .
  • a pump chamber outlet opening 46 which is provided with a corresponding check valve 44 and is covered by a cover element 54 in such a way that a noise protection chamber is created.
  • a pump chamber outlet opening 46 is provided, but several pump chamber outlet openings can also be provided.
  • the flange element 20 immediately adjacent to the axial-proximal thrust washer 24 has a pump inlet port 52, which leads to a pump inlet opening, not shown, which is connected to the pump chamber inlet opening 42 is fluidly connected. The compressed air is discharged via a pump outlet connection, not shown in any more detail, which is fluidically connected to the pump chamber outlet opening.
  • the one-piece flange element 20 has the disc body 27 with the end shield 22 and the axial-proximal thrust washer 24 .
  • the flange element 20 is a one-piece die-cast aluminum part that is provided with a coating over its entire surface that was produced by anodizing the flange element 20 .
  • the vacuum pump 10 can be easily mounted in or on the motor vehicle in question.
  • the pump chamber inlet and/or outlet are preferably also integrated into the flange element 20 .

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

Description

Die Erfindung bezieht sich auf eine Kfz-Hilfsaggregat-Vakuumpumpe, die als elektromotorisch angetriebene und trockenlaufende Flügelzellenpumpe ausgebildet ist, mit einem Gehäuseverbund, der eine Elektromotorsektion und eine Pumpensektion sowie eine Pumpeneinlass- und Pumpenauslassöffnung aufweist, wobei die Elektromotorsektion einen Motorrotor aufweist, der radial und axial-distal von einem Motorgehäusetopf umgeben ist, der proximal von einem ein Lager tragenden Lagerschild verschlossen ist, wobei die Pumpensektion ein einen Pumpenraum definierendes Pumpengehäuse mit einem Abschlusselement aufweist, wobei das Pumpengehäuse zumindest von einer axial-proximalen Anlaufscheibe, einer axial-distalen Anlaufscheibe und einem radialen Hubring gebildet ist, wobei das Pumpengehäuse mindestens eine Pumpenraum-Einlassöffnung und mindestens eine Pumpenraum-Auslassöffnung aufweist, wobei der Motorrotor koaxial mit einem im Pumpenraum angeordneten Pumpenrotor ausgerichtet ist, dessen Rotorkörper mindestens drei verschiebbar am Rotorkörper gelagerte Rotorflügel aufweist.The invention relates to a motor vehicle auxiliary unit vacuum pump, which is designed as an electric motor-driven and dry-running vane pump, with a housing assembly that has an electric motor section and a pump section as well as a pump inlet and pump outlet opening, the electric motor section having a motor rotor that rotates radially and is surrounded axially-distally by a motor housing pot, which is closed proximally by an end shield carrying a bearing, the pump section having a pump housing defining a pump chamber with a closing element, the pump housing being surrounded by at least one axial-proximal thrust washer, one axial-distal thrust washer and a radial cam ring is formed, the pump housing having at least one pump chamber inlet opening and at least one pump chamber outlet opening, the motor rotor being aligned coaxially with a pump rotor arranged in the pump chamber, the rotor body of which has at least has at least three rotor blades mounted displaceably on the rotor body.

Vakuumpumpen sind aus dem Stand der Technik hinlänglich bekannt. Der grundsätzliche Aufbau ist beispielsweise aus der US 5,149,257 A bekannt. Hierbei ist ein Pumpenraum, in dem ein Pumpenrotor vorgesehen ist, zwischen zwei Gehäusewandungen und einem, den Pumpenraum in radialer Richtung begrenzenden Hubring vorgesehen.Vacuum pumps are well known from the prior art. The basic structure is, for example, from US 5,149,257A famous. Here, a pump chamber, in which a pump rotor is provided, is provided between two housing walls and a cam ring delimiting the pump chamber in the radial direction.

Derartige Hilfsaggregat-Vakuumpumpen dienen in Kraftfahrzeugen zur Versorgung anderer Aggregate, beispielsweise eines Bremskraftverstärkers, mit einem Unterdruck von beispielsweise absolut 100 Millibar und niedriger und/oder mit einem Überdruck. Um bei der Bereitstellung des Über- bzw. Unterdrucks unabhängig von der Drehzahl des Kfz-Antriebsmotors, beispielsweise eines Verbrennungsmotors, zu sein, werden elektromotorisch angetriebene Vakuumpumpen eingesetzt, die in der Regel als Flügelzellenpumpen mit mindestens drei Rotorflügeln ausgebildet sind.Such auxiliary unit vacuum pumps are used in motor vehicles to supply other units, for example a brake booster, with a vacuum of, for example, 100 millibar absolute and lower and/or with an overpressure. In order to be able to provide the positive or negative pressure independently of the speed of the vehicle drive motor, For example, an internal combustion engine, electric motor-driven vacuum pumps are used, which are usually designed as vane pumps with at least three rotor blades.

Aus DE 199 36 644 A1 ist der typische Aufbau einer elektrischen Kfz-Hilfsaggregat-Vakuumpumpe bekannt. Der Motorrotor steckt in einem Gehäusetopf, der proximal von einem Lagerschild verschlossen wird, der ein Radiallager zur Lagerung der Rotorwelle aufweist. Auf der motorabgewandten Seite schließt sich an das Lagerschild eine separate erste Anlaufscheibe des Pumpengehäuses an, die zusammen mit einer zweiten Anlaufscheibe und einem zirkulären Hubring ein Pumpengehäuse bildet, das einen Pumpraum definiert bzw. umschließt. In dem Pumpraum ist der Pumpenrotor angeordnet, dessen Rotorkörper mehrere verschiebbar darin gelagerte Rotorflügel aufweist. Der Zusammenbau der Vakuumpumpe ist aufwendig, da sie aus vielen Teilen besteht und der Gehäusetopf, das Lagerschild und der Hubring axial genau miteinander ausgerichtet werden müssen. Eine ähnliche Lösung ist aus der WO 2013/007278 A1 bekannt, bei der eine Anlaufscheibe zwischen der den Pumpenraum begrenzenden Gehäusewandung und dem Pumpenrotor beziehungsweise dem Hubring vor zu sehen. Eine derartige Vakuumpumpe ist jedoch aufwendig herzustellen, da die Anlaufscheibe gegenüber dem Hubring und der Gehäusewandung ausgerichtet werden muss.Out of DE 199 36 644 A1 the typical structure of an electric motor vehicle auxiliary unit vacuum pump is known. The motor rotor is in a housing pot, which is closed proximally by an end shield that has a radial bearing for supporting the rotor shaft. On the side facing away from the motor, the end shield is followed by a separate first thrust washer of the pump housing, which together with a second thrust washer and a circular cam ring forms a pump housing that defines or encloses a pump chamber. The pump rotor is arranged in the pump chamber, the rotor body of which has a plurality of rotor blades mounted displaceably therein. The assembly of the vacuum pump is complex because it consists of many parts and the housing pot, the end shield and the cam ring must be precisely aligned axially with each other. A similar solution is from WO 2013/007278 A1 known in which to see a thrust washer between the housing wall delimiting the pump chamber and the pump rotor or cam ring. However, such a vacuum pump is expensive to produce since the thrust washer has to be aligned with respect to the cam ring and the housing wall.

Zur Einsparung einer Schmierstoff-Versorgung und zur Vermeidung einer Kontamination der die Vakuumpumpe verlassenden Luft werden trockenlaufende Flügelzellenpumpen eingesetzt. Durch den Wegfall der Schmierung der trockenlaufenden Vakuumpumpe sind an die Werkstoffpaarung Rotorflügel/Hubring der Vakuumpumpe hohe Anforderungen gestellt, wobei insbesondere ein zu großer Verschleiß des Hubrings, auf dem der Kopf des Rotorflügels gleitet, vermieden werden muss.Dry-running vane pumps are used to save on a lubricant supply and to avoid contamination of the air leaving the vacuum pump. Due to the fact that the dry-running vacuum pump does not need to be lubricated, high demands are placed on the material pairing of the rotor blades/cam ring of the vacuum pump, with excessive wear of the cam ring on which the head of the rotor blade slides having to be avoided in particular.

Um dieses Problem zu lösen, ist es aus der EP 2 626 510 A1 bekannt, den Lagerschild, die axial-proximale Anlaufscheibe und den Hubring als Integralkörper auszubilden, wobei dieser Integralkörper aus Aluminium hergestellt ist und gehärtet, bevorzugt eloxiert, sein kann. Eine derartig ausgeführte Vakuumpumpe ist jedoch teuer in der Herstellung. Zudem besteht ein ständiges Bestreben, den Bauraum weiter zu minimieren und die Montage einfacher zu gestalten.To solve this problem, it is from the EP 2 626 510 A1 known to form the end shield, the axial-proximal thrust washer and the cam ring as an integral body, this integral body is made of aluminum and hardened, preferably anodized, can be. However, a vacuum pump designed in this way is expensive to manufacture. In addition, there is a constant effort to further minimize the installation space and to make the assembly easier.

Aufgabe der Erfindung ist es, die Herstellungskosten einer Kfz-Hilfsaggregat-Vakuumpumpe zu verringern, die Montage einer derartigen Pumpe zu vereinfachen und den Bauraum weiter zu minimieren.The object of the invention is to reduce the manufacturing costs of a motor vehicle auxiliary unit vacuum pump, to simplify the assembly of such a pump and to further minimize the installation space.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass ausschließlich das Lagerschild und die axial-proximale Anlaufscheibe als einstückiges Flanschelement ausgeführt sind und von einem einzigen Scheibenkörper gebildet sind, wobei dessen eine Seite das Lagerschild bildet und dessen andere Seite die angrenzende Anlaufscheibe bildet, wobei in dem Lagerschild die Pumpeneinlassöffnung und in der axial-proximalen Anlaufscheibe die korrespondierende Pumpenraum-Einlassöffnung und in der axial-proximalen Anlaufscheibe die korrespondierende Pumpenraum-Einlassöffnung vorgesehen sind.This object is achieved according to the invention in that only the bearing plate and the axial-proximal thrust washer are designed as a one-piece flange element and are formed by a single disk body, one side of which forms the bearing plate and the other side of which forms the adjacent thrust washer, with the bearing plate the pump inlet opening and the corresponding pump chamber inlet opening in the axial-proximal thrust washer and the corresponding pump chamber inlet opening in the axial-proximal thrust washer.

Gemäß der Erfindung ist ausschließlich das Lagerschild und die axial-proximale Anlaufscheibe als einstückiges Flanschelement ausgeführt. Ein derartiges Flanschelement ist sehr viel einfacher und damit günstiger herzustellen. Das Flanschelement mit Lagerschild-Funktion schließt den Motor-Gehäusetopf an seinem axial-proximalen Ende ab und bildet oder hält ein Radiallager für die Rotorwelle. Das Radiallager kann ein Gleitlager oder ein Wälzlager sein. Das Lagerschild und die angrenzende Anlaufscheibe sind von einem einzigen Scheibenkörper gebildet, wobei dessen eine Seite das Lagerschild bildet und dessen andere Seite die angrenzende Anlaufscheibe bildet. Durch die Anordnung der Pumpeneinlassöffnung und/oder die Pumpenauslassöffnung im Flanschelement ist die Vakuumpumpe wesentlich flexibler auszulegen und kann die Luftführung wesentlich vereinfacht werden.According to the invention, only the end shield and the axial-proximal thrust washer are designed as a one-piece flange element. Such a flange element is much simpler and therefore cheaper to manufacture. The flange element with bearing shield function closes off the motor housing pot at its axial-proximal end and forms or holds a radial bearing for the rotor shaft. The radial bearing can be a plain bearing or a roller bearing. The bearing plate and the adjoining thrust washer are formed from a single disc body, one side of which forms the bearing plate and the other side of which forms the adjoining thrust washer. The vacuum pump is essential due to the arrangement of the pump inlet opening and/or the pump outlet opening in the flange element to be interpreted more flexibly and the air flow can be significantly simplified.

In einer vorteilhaften Ausführungsform besteht das einstückige Flanschelement aus Aluminium, Aluminium-Bauteile sind bei hoher Stabilität sehr leicht und durch die Härtung auch ausreichend gegen Verschleiß durch den weicheren Rotorflügel-Kopf geschützt. Besonders bevorzugt ist zumindest die Anlaufscheibe des einstückigen Flanschelementes vollflächig gehärtet, bevorzugt eloxiert. Eine derartige harte Eloxal-Schicht ist ausreichend hart, so dass eine hohe Verschleißfestigkeit der Anlaufscheibe gewährleistet ist.In an advantageous embodiment, the one-piece flange element is made of aluminum, aluminum components are very light with high stability and, due to the hardening, are also sufficiently protected against wear due to the softer rotor blade head. Particularly preferably, at least the thrust washer of the one-piece flange element is hardened over its entire surface, preferably anodized. Such a hard anodized layer is hard enough to ensure that the thrust washer is highly wear-resistant.

Vorzugsweise Ist eine Kommutatoranordnung der Elektromotorsektion in dem Flanschelement gelagert. Hierdurch wird die Koaxialität der Motorsektion und der Pumpensektion zwangsläufig hergestellt. Die Montage wird hierdurch wesentlich vereinfacht und die Baulänge verringert.A commutator arrangement of the electric motor section is preferably mounted in the flange element. This positively establishes the coaxiality of the motor section and the pump section. This considerably simplifies assembly and reduces the overall length.

Gemäß einer bevorzugten Ausgestaltung weist das Flanschelement mindestens ein radiales Montageorgan mit einer Stecköffnung zum Einschrauben einer Montageschraube auf. Damit weist das Flanschelement eine weitere Zusatzfunktion auf, die wegen der Integration in ein einziges Bauteil nur geringe zusätzliche Kosten verursacht.According to a preferred embodiment, the flange element has at least one radial assembly element with an insertion opening for screwing in an assembly screw. The flange element thus has a further additional function which, because it is integrated into a single component, causes only minor additional costs.

Bevorzugt weist das Flanschelement ein Stutzenelement mit der Pumpeneinlass- oder Pumpenauslassöffnung auf, um auf einfache Weise mit einer druckgesteuerten Komponente verbunden zu werden.Preferably, the flange element has a nozzle element with the pump inlet or pump outlet opening in order to be easily connected to a pressure-controlled component.

Die Pumpenauslassöffnung kann vorzugsweise im Abschlusselement vorgesehen ist.The pump outlet opening can preferably be provided in the closing element.

Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the drawings.

Es zeigen:

  • Figur 1 eine perspektivische Ansicht einer Kfz-Hilfsaggregat-Vakuumpumpe im teilweise demontierten Zustand, und
  • Figur 2 einen Längsschnitt der Kfz-Hilfsaggregat-Vakuumpumpe der Figur 1.
Show it:
  • figure 1 a perspective view of a motor vehicle auxiliary unit vacuum pump in the partially disassembled state, and
  • figure 2 a longitudinal section of the automotive auxiliary unit vacuum pump figure 1 .

In den Figuren ist eine Kfz-Hilfsaggregat-Vakuumpumpe 10 dargestellt, die als elektromotorisch angetriebene und trockenlaufende Flügelzellenpumpe ausgebildet ist. Die Vakuumpumpe 10 dient in einem Kraftfahrzeug, das beispielsweise durch einen Verbrennungsmotor angetrieben wird, als Hilfsaggregat zur Bereitstellung eines Unterdrucks von absolut 100 Millibar oder weniger. Die Vakuumpumpe 10 wird bei einer konstanten NennDrehzahl von ungefähr 3000 U/min betrieben, kann jedoch grundsätzlich auch bei einer variablen Drehzahl betrieben werden. Die Vakuumpumpe 10 weist einen Gehäuseverbund 11 auf und ist funktionell und in Längsrichtung in eine Elektromotorsektion 12 und in eine Pumpensektion 14 gegliedert.In the figures, a motor vehicle auxiliary unit vacuum pump 10 is shown, which is designed as an electric motor-driven and dry-running vane pump. The vacuum pump 10 is used in a motor vehicle, which is driven by an internal combustion engine, for example, as an auxiliary unit for providing a negative pressure of 100 millibars absolute or less. The vacuum pump 10 is operated at a constant nominal speed of approximately 3000 rpm, but can in principle also be operated at a variable speed. The vacuum pump 10 has a housing assembly 11 and is divided functionally and in the longitudinal direction into an electric motor section 12 and a pump section 14 .

In der Elektromotorsektion 12 ist eine drehbar gelagerte Rotorwelle 18 vorgesehen, an der drehfest ein Motorrotor 17 befestigt ist, der beispielsweise permanent magnetisch erregt ausgebildet sein kann. Ferner ist in der Elektromotorsektion 12 ein feststehender Motorstator 19 mit mehreren Statorspulen vorgesehen. Ein Motorgehäuse wird im Wesentlichen von einem Motorgehäusetopf 16 gebildet, der an seinem axial-distalen Ende eine Lager-Ausnehmung 15 für ein als Radial-Lager 13 ausgebildetes Lager aufweist, das beispielsweise als Wälzlager ausgebildet sein kann. Die Elektromotorsektion 12 wird proximal abgeschlossen durch ein Lagerschild 22, das ein als Radial-Axial-Lager ausgebildetes Lager 25 zur Lagerung der Rotorwelle 18 trägt. Das Radiallager 25 ist als Wälzlager ausgebildet, kann jedoch grundsätzlich auch als Gleitlager ausgebildet sein. Das Lagerschild 22 wird von einem in einer Querebene liegenden Scheibenkörper 27 gebildet, der Teil eines einstückigen Flanschelementes 20 ist. An einem ringförmigen Flanschteil 28 des Flanschelementes 20 ist der Gehäusetopf 16 befestigt. An der Innenseite dieses ringförmigen Flanschteiles 28 sind eine Kommutatoranordnung 33 sowie nicht weiter dargestellte elektrische Bauteile der Elektromotorsektion 12 befestigt. Hierdurch wird in Kombination mit dem integrierten Lagerschild 22 auf besonders einfache Weise eine Koaxialität der Pumpensektion 14 mit der Elektromotorsektion 12 gewährleistet.A rotatably mounted rotor shaft 18 is provided in the electric motor section 12, to which a motor rotor 17 is fastened in a rotationally fixed manner, which motor rotor 17 can, for example, be designed to be permanently magnetically excited. Also provided in the electric motor section 12 is a fixed motor stator 19 having a plurality of stator coils. A motor housing is essentially formed by a motor housing pot 16, which has a bearing recess 15 at its axial-distal end for a bearing designed as a radial bearing 13, which can be designed as a roller bearing, for example. The electric motor section 12 is terminated proximally by an end shield 22 which carries a bearing 25 designed as a radial-axial bearing for supporting the rotor shaft 18 . The radial bearing 25 is designed as a roller bearing, but can in principle also be designed as a plain bearing. The end shield 22 is formed by a disc body 27 which lies in a transverse plane and is part of a one-piece flange element 20 . The housing pot 16 is fastened to an annular flange part 28 of the flange element 20 . On the inside of this ring-shaped A commutator arrangement 33 and electrical components of the electric motor section 12 (not shown in any more detail) are attached to the flange part 28 . In this way, in combination with the integrated end shield 22, coaxiality of the pump section 14 with the electric motor section 12 is ensured in a particularly simple manner.

Die Pumpensektion 14 wird gebildet von der Rotorwelle 18, an der ein fliegend gelagerter Pumpenrotor 30 drehfest befestigt ist, dem Pumpengehäuse 29, das einen Pumpenraum 31 definiert, und einer Abschlussscheibe 40. Der Pumpenrotor 30 weist einen Rotorkörper 32 mit fünf verschiebbar an dem Rotorkörper 32 gelagerten Rotorflügeln 34 auf, deren Rotorflügel-Köpfe aus Graphit bestehen und die mehrere Pumpzellen voneinander trennen. Der Rotorkörper 32 ist drehfest und in gewissem Maße axial verschiebbar auf der Rotorwelle 18 befestigt, so dass der Pumpenrotor 30 stets eine möglichst reibungsfreie axiale Position zwischen beiden Anlaufscheiben 24, 40 einnehmen kann. Das Pumpengehäuse 29 wird hierbei von der axial-proximalen Anlaufscheibe 24, der in Bezug auf den Pumpenrotor 30 der axial-proximalen Anlaufscheibe 24 axial gegenüberliegenden axial-distalen Anlaufscheibe 40 und einem Hubring 26 gebildet und durch einen Abschlussdeckel 50, der auf das Flanschelement 20 aufgeklemmt ist, abgedeckt.The pump section 14 is formed by the rotor shaft 18, to which an overhung pump rotor 30 is fixed in a rotationally fixed manner, the pump housing 29, which defines a pump chamber 31, and a cover plate 40. The pump rotor 30 has a rotor body 32 with five slidable on the rotor body 32 mounted rotor blades 34, the rotor blade heads are made of graphite and separate several pump cells from each other. The rotor body 32 is fixed to the rotor shaft 18 in a rotationally fixed and axially displaceable manner to a certain extent, so that the pump rotor 30 can always assume an axial position between the two thrust washers 24, 40 that is as friction-free as possible. The pump housing 29 is formed here by the axial-proximal thrust washer 24, the axial-distal thrust washer 40 which is axially opposite the axial-proximal thrust washer 24 in relation to the pump rotor 30 and a cam ring 26, and by a cover plate 50 which is clamped onto the flange element 20 is, covered.

In der axial-proximalen Anlaufscheibe 24 ist eine Pumpenraum-Einlassöffnung 42 vorgesehen. In der axial-distalen Anlaufscheibe 40 ist eine mit einem entsprechenden Rückschlagventil 44 versehener Pumpenraum-Auslassöffnung 46 vorgesehen, die von einem Deckelement 54 derart überdeckt wird, dass ein Schallschutzraum hergestellt ist. Im vorliegenden Ausführungsbeispiel ist eine Pumpenraum-Auslassöffnung 46 vorgesehen, es können jedoch auch mehrere Pumpenraum-Auslassöffnungen vorgesehen sein. Das an die axial-proximale Anlaufscheibe 24 unmittelbar angrenzende Flanschelement 20 weist einen Pumpeneinlass-Stutzen 52, der zu einer nicht dargestellten Pumpeneinlassöffnung führt, die mit der Pumpenraum-Einlassöffnung 42 fluidisch verbunden ist. Über einen nicht weiter dargestellten Pumpenauslassstutzen, der fluidisch mit der Pumpenraum-Auslassöffnung verbunden ist, wird die komprimierte Luft abgeführt.A pump chamber inlet opening 42 is provided in the axially proximal thrust washer 24 . In the axial-distal thrust washer 40 there is a pump chamber outlet opening 46 which is provided with a corresponding check valve 44 and is covered by a cover element 54 in such a way that a noise protection chamber is created. In the present exemplary embodiment, a pump chamber outlet opening 46 is provided, but several pump chamber outlet openings can also be provided. The flange element 20 immediately adjacent to the axial-proximal thrust washer 24 has a pump inlet port 52, which leads to a pump inlet opening, not shown, which is connected to the pump chamber inlet opening 42 is fluidly connected. The compressed air is discharged via a pump outlet connection, not shown in any more detail, which is fluidically connected to the pump chamber outlet opening.

Das einstückige Flanschelement 20 weist den Scheibenkörper 27 mit dem Lagerschild 22 und der axial-proximalen Anlaufscheibe 24 auf. Das Flanschelement 20 ist ein einstückiges Aluminium-Druckgussteil, das vollflächig mit einer Beschichtung versehen ist, die durch Eloxieren des Flanschelementes 20 hergestellt wurde.The one-piece flange element 20 has the disc body 27 with the end shield 22 and the axial-proximal thrust washer 24 . The flange element 20 is a one-piece die-cast aluminum part that is provided with a coating over its entire surface that was produced by anodizing the flange element 20 .

An dem Scheibenkörper 27 sind drei radiale Montageorgane 23 mit jeweils einer Öffnung zum Einschrauben einer Montageschraube 56 vorgesehen. An der Montageschraube 56 ist jeweils ein Dämpfungsorgan 58 vorgesehen. Durch das Dämpfungsorgan 58 ist der Gehäusetopf 16 mit dem Flanschelement 20 verklemmt. Mit Hilfe der Montageschrauben 56 und der Montagenasen 23 kann die Vakuumpumpe 10 auf einfache Weise in bzw. an dem betreffenden Kraftfahrzeug montiert werden.On the disk body 27, three radial mounting members 23 are provided, each with an opening for screwing in a mounting screw 56. A damping element 58 is provided on the mounting screw 56 in each case. The housing pot 16 is clamped to the flange element 20 by the damping element 58 . With the help of the mounting screws 56 and the mounting lugs 23, the vacuum pump 10 can be easily mounted in or on the motor vehicle in question.

Vorzugsweise sind der Pumpenkammer-Einlass und/oder -Auslass ebenfalls in das Flanschelement 20 integriert.The pump chamber inlet and/or outlet are preferably also integrated into the flange element 20 .

Claims (7)

  1. Motor vehicle auxiliary unit vacuum pump (10), which is configured as an electromotively driven and dry-running vane pump, with a housing assembly (11) which comprises an electric motor section (12) and a pump section (14) as well as a pump inlet opening and a pump outlet opening, wherein
    the electric motor section (12) comprises a motor rotor (17) which is radially and axially-distally surrounded by a motor housing pot (16), which motor housing pot (16) is proximally closed by a bearing shield (22) that holds a bearing (25), wherein
    the pump section comprises a pump housing (29) which defines a pump chamber (31) and comprises an end element (50), wherein the pump housing (29) is defined at least by an axially-proximal thrust washer (24), an axially-distal thrust washer (40) and a radial stroke ring (26), wherein the pump housing comprises at least one pump chamber inlet opening (42) and at least one pump chamber outlet opening (46), wherein
    the motor rotor (17) is aligned coaxially with a pump rotor (30) which is arranged in the pump chamber (31) and the rotor body (32) of which comprises at least three rotor blades (34) displaceably supported on the rotor body (32),
    characterized in that
    only the bearing shield (22) and the axially-proximal thrust washer (24) are implemented as a single-piece flange element (20) and are defined by a single disc body (27), wherein one side of the disc body (27) defines the bearing shield (22) and the other side of the disc body (27) defines the adjacent thrust washer (24), wherein the pump inlet opening is provided in the bearing shield (22) and the corresponding pump chamber inlet opening (42) is provided in the axially-proximal thrust washer (24).
  2. Motor vehicle auxiliary unit vacuum pump (10) according to claim 1, characterized in that the single-piece flange element is made of aluminum.
  3. Motor vehicle auxiliary unit vacuum pump (10) according to claim 2, characterized in that at least the thrust washer of the single-piece flange element (20) is hardened over its entire surface, preferably anodized.
  4. Motor vehicle auxiliary unit vacuum pump (10) according to one of the preceding claims, characterized in that a commutator arrangement (33) of the electric motor section (12) is at least partially supported in the flange element.
  5. Motor vehicle auxiliary unit vacuum pump (10) according to one of the preceding claims, characterized in that the flange element (20) comprises at least one radial mounting member (23) with a plug-in opening for screwing in a mounting screw (56).
  6. Motor vehicle auxiliary unit vacuum pump (10) according to one of the preceding claims, characterized in that the flange element (20) comprises a nozzle element (52) with the pump inlet opening or the pump outlet opening.
  7. Motor vehicle auxiliary unit vacuum pump (10) according to one of the preceding claims, characterized in that the pump outlet opening is provided in the end element (50).
EP17722457.3A 2016-07-08 2017-05-10 Automotive auxiliary assembly vacuum pump having a single-piece flange element Active EP3482047B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016112555.5A DE102016112555B4 (en) 2016-07-08 2016-07-08 Automotive auxiliary equipment vacuum pump
PCT/EP2017/061145 WO2018007052A1 (en) 2016-07-08 2017-05-10 Automotive auxiliary assembly vacuum pump having a single-piece flange element

Publications (2)

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EP3482047A1 EP3482047A1 (en) 2019-05-15
EP3482047B1 true EP3482047B1 (en) 2022-12-21

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US (1) US11078912B2 (en)
EP (1) EP3482047B1 (en)
CN (1) CN109415938B (en)
DE (1) DE102016112555B4 (en)
WO (1) WO2018007052A1 (en)

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EP2626510A1 (en) * 2012-02-13 2013-08-14 Pierburg Pump Technology GmbH Motor vehicle auxiliary power unit vacuum pump

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US5149257A (en) * 1989-03-29 1992-09-22 Diesel Kiki Co., Ltd. Compressor with a cylinder having improved seizure resistance and improved wear resistance, and method of manufacturing the cylinder
DE19936644B4 (en) 1999-08-04 2004-04-01 Hella Kg Hueck & Co. Electric air pump for motor vehicles
JP4156830B2 (en) * 2001-12-13 2008-09-24 エドワーズ株式会社 Vacuum pump
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FR2900988B1 (en) 2006-05-12 2010-01-01 Groupement Coeur Artificiel Total Carpentier Matra Carmat ROTARY VOLUMETRIC PUMP WITH REDUCED RADIAL SIZE
EP2532895B1 (en) * 2011-06-06 2014-02-26 Vacuubrand Gmbh + Co Kg Vacuum pump with pump rotor bearings on a single side
EP2729667B1 (en) * 2011-07-08 2017-06-07 Pierburg Pump Technology GmbH Vacuum pump for use in the automotive sector
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
JP5879010B2 (en) 2014-01-09 2016-03-08 カルソニックカンセイ株式会社 Gas compressor
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EP2626510A1 (en) * 2012-02-13 2013-08-14 Pierburg Pump Technology GmbH Motor vehicle auxiliary power unit vacuum pump

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Publication number Publication date
CN109415938B (en) 2021-10-22
US11078912B2 (en) 2021-08-03
DE102016112555A1 (en) 2018-01-11
CN109415938A (en) 2019-03-01
DE102016112555B4 (en) 2021-11-25
US20190338642A1 (en) 2019-11-07
WO2018007052A1 (en) 2018-01-11
EP3482047A1 (en) 2019-05-15

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