EP1576293B1 - Electrically driven air pump and method for the production thereof - Google Patents

Electrically driven air pump and method for the production thereof Download PDF

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Publication number
EP1576293B1
EP1576293B1 EP03788774A EP03788774A EP1576293B1 EP 1576293 B1 EP1576293 B1 EP 1576293B1 EP 03788774 A EP03788774 A EP 03788774A EP 03788774 A EP03788774 A EP 03788774A EP 1576293 B1 EP1576293 B1 EP 1576293B1
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EP
European Patent Office
Prior art keywords
air pump
electric motor
balancing
pump
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP03788774A
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German (de)
French (fr)
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EP1576293A1 (en
Inventor
Ulrich Luedtke
Claudius Muschelknautz
Fabrice Burg
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1576293A1 publication Critical patent/EP1576293A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/662—Balancing of rotors

Definitions

  • the invention relates to a method for producing an electrically driven secondary air pump for a motor vehicle having an internal combustion engine, having the features of the preamble of claim 1 or such an electrically driven air pump having the features of the preamble of claim 5.
  • Generic air pumps or blowers are used for example as secondary air pumps or secondary air blower for blowing additional air into the exhaust passage of an internal combustion engine of a motor vehicle.
  • This method minimizes the formation of nitrogen oxides or leads to a reduction in the content of carbon monoxide or hydrocarbons in the combustion residues before the exhaust gas enters the catalyst of the internal combustion engine.
  • fresh air is supplied to the exhaust duct as close as possible behind the engine to eliminate the hydrocarbon compounds formed during the combustion process and the carbon monoxide.
  • the secondary air supply into the exhaust line is practically set in an afterburning of the exhaust gases, in the course of which burned in the engine unburned carbon monoxide or hydrocarbons, i. be oxidized.
  • the post-combustion by a secondary air supply system also increases the exhaust gas temperature, so that the required operating temperature for a controlled catalyst is reached early. Higher temperatures In the exhaust system, the regulated catalytic converter reacts faster, enabling it to fulfill its task of eliminating pollutants earlier in the driving cycle.
  • An electrically driven air pump which has a housing in which on one side a pumping plant and on the other side an electric motor are arranged. Pump and motor side of the housing of the air pump EP 0 711 924 B1 are each closed by lids.
  • the electric motor driving the pump mechanism is largely decoupled within the pump by means of two elastomer rings, which are supported between the electric motor and the pump housing.
  • the electric motor of this electrically driven air pump of the prior art is balanced with mounted impeller, when installed, not yet closed pump side by the setting of balancing marks on an impeller of the pump factory, characterized in that the electric motor is balanced in the installed state with mounted impeller can the interaction of the electric motor with other components of the air pump are taken into account. Due to the balancing process on the mounted electric motor, the running quality of such an air pump can be reduced by reducing the vibrations that occur, but it is not possible to avoid specimen scattering from air pump to air pump.
  • the invention is based on the object to provide a method for producing an electric secondary air pump with reduced vibrations and, consequently, also reduced running noise, wherein a balancing over the prior art facilitates bwz. is improved. It is also an object of the present invention to provide such an air pump.
  • the air pump having a housing in which a pump unit with at least one fan and an electric motor driving the at least one fan are integrated, balanced with the already built into the housing electric motor by balancing in at least two axially spaced planes , According to the invention it is provided that the air pump is balanced after mounting the at least one fan wheel on a shaft of the electric motor with built-in electric motor by balancing on a fan and an axially spaced from the fan wheel balancing disk.
  • an air pump is claimed with the features of claim 5, wherein according to the invention in the region of the pumping station remote from the end of the drive shaft of the electric motor, a balancing disc is arranged and a balancing takes place both on the fan and on the fan wheel axially spaced balancing disc due to this Two-level balancing can significantly increase the balancing quality of the electrically driven air pump according to the invention, so that specimen scattering in the running noise of the pump can be further reduced.
  • the balancing wheel is mounted on the side facing away from the pump mechanism side of the shaft of the electric motor. In this way, the two balancing planes have a large axial distance from one another.
  • the electric motor of the air pump is decoupled by means of elastic means from the pump housing vibration technology. This leads to a further reduction of the vibrations of the drive motor to the pump housing.
  • the balancing speed and / or the type of balancing absorption during balancing of the air pump is matched to the natural frequency of the decoupling means.
  • the air pump according to the invention is balanced in a speed range well below the resonant frequency of Enticopplungsstoff. In this way it is possible to minimize the influence of the elastic coupling means between the electric motor and the pump housing on the running behavior of the air pump.
  • the elastic means for supporting the electric motor are also designed such that the pump unit of the air pump is sealed relative to the motor part.
  • the elastic means in the form of two axially spaced-apart elastomeric rings are formed.
  • the fan-side elastomeric ring has in an advantageous embodiment of the air pump according to the invention a sealing lip which seals the pumping unit of the air pump relative to the motor part.
  • At least one elastomer ring may have means for torque support of the drive motor, so that the motor is securely fixed especially in its start-up phase.
  • the claimed method of manufacturing an electrically driven air pump provides an air pump which, due to its complete balancing in two levels, ensures an extremely smooth running due to the strong structure-borne sound insulation caused by the mechanical decoupling of the electric motor and the additional, in the assembled state complete balancing achieved in two levels, it is possible to use the inventive air pump without complex decoupling for the body attachment.
  • the drawing shows an embodiment of an inventive electrically driven air pump for the compression of combustion air is shown.
  • This air pump and the inventive method for producing such an air pump will be explained in more detail in the following description.
  • the figures of the drawing, the description and the claims directed thereto contain numerous features in combination. A person skilled in the art will also consider these features individually and combine them into meaningful, further combinations.
  • FIG. 1 shows a longitudinal section through an embodiment of an inventive electrically driven air pump 10 in the assembled state.
  • the air pump 10 comprises a pump part 11 and a drive or motor part 15, which are surrounded by a housing 12.
  • the pump part 11 consists essentially of a pump unit 13 and corresponding inlet and outlet openings for the air to be delivered.
  • the pump housing 12 is, according to the embodiment FIG. 1 essentially formed in three pieces.
  • the housing 12 has a pump-side cover 20 and a drive motor-side cover 22.
  • the pump-side lid 20 has a central opening 44 through which the air to be compressed is sucked.
  • the housing 12 of the air pump 10 according to the invention is advantageously made of a plastic
  • the driving electric motor 16 is inserted, which in the embodiment of FIG. 1 is designed as an internal rotor and at least via a rotor 19 and a, the rotor encompassing stator 21 has.
  • the stator 21 is in the embodiment of the pump according to the invention after FIG. 1 realized by magnets 25.
  • the motor housing 17 of the electric motor 16 is formed by a pole housing 30 of the motor.
  • Other motor types than the internal rotor shown in the embodiment are for the inventive air pump but also conceivable.
  • the electric motor 16 drives via a shaft 23, the pump unit 13 to compress the air.
  • the electric motor 16 is decoupled via elastic means 24 from the housing 12 of the air pump.
  • Elastomer rings 26 and 28 are used for vibration damping.
  • the elastomer rings 26 and 28 are on the end faces of the pole housing 30 of the electric motor 16 between the pole housing 30 and Pump housing 12 is placed.
  • the elastomer rings are formed and introduced such that both a radial and an axial support of the electric motor 16 takes place in the pump housing.
  • the motor-side decoupling 28 is executed in its shape so that a torque support of the electric motor 16 is provided on the housing.
  • the torque support can of course also be formed on the pump-side elastomer ring 26 or on both elastomer rings.
  • the pumping-side elastomer ring 26 has a sealing lip 27, which causes the elastic means 24 to improve the smoothness of the air pump 10 according to the invention also serve as sealing elements between the motor part 15 and the pump unit 13 of the air pump according to the invention.
  • the pumping-side elastomeric ring 26 is arranged in the region of a bearing plate 32 of the drive motor which is aligned with the pumping station 13.
  • a retaining cover 34 is installed on the side facing away from the pump unit 13 of the motor housing 17.
  • the retaining cover 34 is pressed against the elastomer ring 28 and locked with the central housing part 14 of the pump housing 12. In this way, the electric motor 16 is fixed in the axial direction.
  • the shaft 23 of the drive motor 16 of the air pump 10 according to the invention is led out of this at both axial ends of the motor housing 17 and carries on its one, in the figure of FIG. 1 right side, wheels 36 and 38 of the pump factory 13.
  • the pump unit 13 of the air pump according to the invention according to the embodiment of FIG. 1 is executed in two stages. Between the two wheels 36 and 38 of the pump factory, a stator 40 is arranged, which is firmly connected to the housing 12 of the air pump.
  • the stator 40 has structures in the form of channels 42, which ensure that the radially outwardly from the first impeller 36 conveyed air from the outer region of the first impeller in the inner impeller region of the second impeller 38 is promoted, so that an effective two-stage compression the sucked air can take place.
  • the radially outwardly guided by the second impeller 38, compressed air is conveyed in a, in the circumferential direction of the housing 12 of the air pump 10 extending, annular air duct 18 whose diameter in the circumferential direction of the pump housing 12 increases.
  • This air duct 18 (volute) opens into a, in FIG. 1 not shown on the pressure side connection of the air pump.
  • the air pump 10 according to the invention is not limited to a two-stage pump unit 13. More or less pump stages can of course also be used in a pump according to the invention.
  • each further impeller is also assigned a further stator, which conveys the radially outwardly conveyed air of the upstream impeller into the radially inner region of the downstream impeller.
  • the pump-side lid 20 is designed such that on its inside, i. the side facing the first impeller 36 of the pump unit 13, structures 47 are formed, which prevent a backflow of the air compressed via the first impeller in the intake of the pump unit.
  • the housing of the air pump is closed on the pumping side by a cover 20 which has a central opening 44 for sucking the air to be compressed.
  • the central opening 44 in the cover 20 of the pump housing 12 is in the embodiment of FIG. 1 designed as a nozzle 46, which makes it possible to install corresponding connection means, such as hoses, quickly and easily to the pump according to the invention.
  • the pump housing 12, the stator 40 of the pump unit 13 and the pump-side cover 20 are connected to each other towards the end of the inventive method for producing an electrically driven air pump.
  • connection technology here all known to those skilled in the techniques can be used.
  • a balancing disk 50 is installed on the drive shaft 23 of the motor 16, which is rotatably connected to the drive shaft.
  • This balancing disc 50 may be made of metal, for example of a sheet metal, and has a diameter which is typically smaller than the diameter of the rotor 19 of the drive motor 16.
  • the balancing disc 50 is known to one skilled in the art Fixing method rotatably connected to the drive shaft 23.
  • Balancing marks for example by removal of material, can be placed on the balancing disk 50 to compensate for the imbalance of the air pump 10 according to the invention.
  • the pump unit 13 remote from the end of the housing 12 of the air pump 10 according to the invention is closed by a cover 22 after installation of the air pump.
  • the assembled drive motor 16 is first provided with the decoupling rings 26 and 28, respectively.
  • the electric motor 16 per se can already be pre-balanced so that a first balancing operation is carried out, for example, by removal of material or material on the motor shaft or on the rotor or also at the armature of the motor.
  • pre-balancing of the electric motor 16 can be dispensed with, so that only the balancing of the air pump 10 to be described with the mounted electric motor 16 and the mounted pump wheel 36 or 38 need be performed.
  • the preassembled electric motor 16 is inserted through an opening 52 of the pump housing 12 facing away from the pump housing 13 into the pump housing 12 and secured in the axial and radial direction by latching of the retaining cover 34 on the housing.
  • the locking of the retaining cover 34 is to be selected so that the elastomer rings 26 and 28 are pressed under a certain bias against the inside of the pump housing 12.
  • the impeller 38, the stator 40 and the impeller 36 are mounted on the pumping unit end of the drive shaft 23 of the electric motor 16.
  • the air pump is balanced with the pump unit 13 installed when the electric motor 16 is installed.
  • FIG. 2 shows the pump according to the invention with built-in electric motor 16 and mounted pump unit 13, as used for balancing example in a balancing machine.
  • the balancing operation is carried out successively or in parallel in two, substantially perpendicular to the drive shaft 23 of the air pump 10 arranged balancing planes A and B respectively.
  • the balancing plane A is formed by the balancing wheel 50 at the end of the drive shaft 23 facing away from the pump mechanism 13.
  • the second balancing plane B is described in the exemplary embodiment of FIG FIG. 2 through the cover plate 54 of the impeller 36 of the pump unit 13 of the invention Air pump 10 is formed.
  • the balancing plane B can also coincide with the base disk 56 of the impeller 36.
  • the air pump 10 according to the invention is balanced by the setting of balancing marks in one or both balancing planes.
  • material from the balancing disk 50 or the cover disk 54 can be "nibbled".
  • the balancing speed and the type of balancing absorption is matched to the natural frequency of the decoupling of the electric motor 16 by the elastic means 24.
  • the balancing of the air pump according to the invention in the speed range of the natural frequency of the decoupling means 24 is prohibited.
  • a material removal by evaporation by means of a high-intensity light or laser beam is another possible method for setting balance marks in the method according to the invention. Furthermore, it is also possible to realize balancing marks by the application of the adhesive points, in particular on a fan or the balancing disk.
  • the stator 40 is fixed axially and radially between the housing part 14 and the lid 20 so that it is secured against rotation.
  • the stator 40 can be fitted at its outer periphery 58 in corresponding recesses 60 of the central housing part 14 of the pump housing 12 and in recesses 62 of the pump-side cover 20 and clamped by the assembly of the lid 20.
  • the bracing, screwing, riveting, gluing, ultrasonic welding or friction welding are mentioned here as possible fastening methods.
  • the air pump according to the invention is not limited to the embodiments illustrated in the figures.
  • the air pump according to the invention is not limited to the use of a two-stage pumping station.
  • the inventive method for producing an electrically driven air pump is not limited to the mechanical mass removal on the fan or the balancing disk.
  • balancing masses for example, a melting of material to improve the balancing quality, in particular an optically induced melting, conceivable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to a method for producing an electrically driven air pump (10), especially a method for producing a secondary air pump (10) for a motor vehicle comprising an internal combustion engine. Said air pump (10) is provided with a housing (12), within which a pump mechanism (13) that encompasses at least one ventilator wheel (36, 38), and an electric motor (16) that drives the at least one ventilator wheel (36, 28) are disposed. The inventive air pump (10) is balanced in the mounted state of the electric motor (16) in the housing (12) by balancing on at least two planes (A, B) that are located at an axial distance from each other. The invention further relates to an electrically driven air pump (10), particularly a secondary air pump (10) for a motor vehicle comprising an internal combustion engine. Said air pump (10) encompasses a housing (12), an electric motor (16) which is integrated into the housing (12) and is supported therein with the aid of elastic means (24), and a pump mechanism (13) which is provided with at least one ventilator wheel (36, 38) that is fixed onto a shaft (23) of the driving motor (16). A balancing disk (50) is arranged in the area of the end of the drive shaft (23) of the electric motor (16), which is located opposite the pump mechanism (13).

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren zur Herstellung einer elektrisch angetriebenen Sekundärluftpumpe für ein Kraftfahrzeug mit Verbrennungsmotor, mit den Merkmalen des Oberbegriffs des Anspruchs 1 bzw. eine solche elektrisch angetriebene Luftpumpe mit den Merkmalen des Oberbegriffs des Anspruchs 5.The invention relates to a method for producing an electrically driven secondary air pump for a motor vehicle having an internal combustion engine, having the features of the preamble of claim 1 or such an electrically driven air pump having the features of the preamble of claim 5.

Gattungsgemäße Luftpumpen beziehungsweise Gebläse werden beispielsweise als Sekundärluftpumpen bzw. Sekundärluftgebläse zum Einblasen zusätzlicher Luft in den Abgaskanal einer Brennkraftmaschine eines Kraftfahrzeuges verwendet. Diese Methode minimiert die Entstehung von Stickoxiden bzw. führt sie zu einer Reduzierung des Gehaltes an Kohlestoffmonoxiden bzw. Kohlenwasserstoffen in den Verbrennungsrückständen, bevor das Abgas In den Katalysator der verbrennungsmaschine gelangt. Bei der Sekundärluftzuführung wird dem Abgaskanal möglichst kurz hinter dem Motor Frischluft zugeführt, um die beim Verbrennungsvorgang entstandenen Kohlenwasserstoff-Verbindungen und das Kohlenmonoxid zu eliminieren. Durch die Sekundärluftzuführung in den Abgasstrang wird praktisch eine Nachverbrennung der Abgase in Gang gesetzt, in deren Verlauf die im Motor unverbrannten Kohlenmonoxide bzw. Kohlenwasserstoffe nachverbrannt, d.h. nachoxidiert werden. Die Nachverbrennung durch ein Sekundänuftzuführungssystem erhöht darüber hinaus die Abgastemperatur, so dass die für einen geregelten Katalysator erforderliche Betriebstemperatur frühzeitig erreicht wird. Höhere Temperaturen Im Abgasstrang lassen so den geregelten Katalysator schneller ansprechen, so dass dieser seine Aufgabe, Schadstoffe zu eliminieren, früher im Fahrzyklus erfüllen kann.Generic air pumps or blowers are used for example as secondary air pumps or secondary air blower for blowing additional air into the exhaust passage of an internal combustion engine of a motor vehicle. This method minimizes the formation of nitrogen oxides or leads to a reduction in the content of carbon monoxide or hydrocarbons in the combustion residues before the exhaust gas enters the catalyst of the internal combustion engine. In the secondary air supply fresh air is supplied to the exhaust duct as close as possible behind the engine to eliminate the hydrocarbon compounds formed during the combustion process and the carbon monoxide. By the secondary air supply into the exhaust line is practically set in an afterburning of the exhaust gases, in the course of which burned in the engine unburned carbon monoxide or hydrocarbons, i. be oxidized. The post-combustion by a secondary air supply system also increases the exhaust gas temperature, so that the required operating temperature for a controlled catalyst is reached early. Higher temperatures In the exhaust system, the regulated catalytic converter reacts faster, enabling it to fulfill its task of eliminating pollutants earlier in the driving cycle.

Auf Grund der hohen Nenndrehzahl von Sekundärluftgebläsen, die typischerweise im Bereich von 20.000 U/min liegt, sind an das Gebläse und insbesondere an den das Gebläse antreibenden Elektromotor extrem hohe Anforderungen an den Gleichlauf und damit an die Güte des Auswuchtprozesses zu stellen. Die auf Grund von Unwuchten erzeugen Vibrationen in der Luftpumpe werden auf die mit der Luftpumpe verbundenen Bauteile übertragen und erzeugen so ein erhöhtes Laufgeräusch. Gegebenenfalls kann es erforderlich sein, die gesamte Luftpumpe mechanisch gegenüber anderen Bauteilen zu entkoppeln, um eine Vibrationsübertragung auf das Fahrzeug und speziell auf den Fahrgastraum zu vermeiden.Due to the high rated speed of secondary air blowers, which is typically in the range of 20,000 rpm, are to the blower and in particular to the blower driving electric motor extremely high demands on the synchronization and thus to the quality of the balancing process. The vibrations generated in the air pump due to imbalances are transmitted to the components connected to the air pump and thus generate an increased running noise. Optionally, it may be necessary to mechanically decouple the entire air pump from other components to prevent vibration transmission to the vehicle and especially to the passenger compartment.

Um die Laufruhe einer solchen Luftpumpe zu verbessern, ist es allgemein bekannt, die Luftpumpe beispielsweise durch Abtragen bzw. Aufbringen von Material an einem Lüfterrad des Pumpenwerkes zu wuchten.In order to improve the smoothness of such an air pump, it is generally known to balance the air pump, for example, by removing or applying material to a fan of the pump factory.

Aus der EP 0 711 924 B1 ist eine elektrisch angetriebene Luftpumpe bekannt, die ein Gehäuse aufweist, in dem auf der einen Seite ein Pumpenwerk und auf der anderen Seite ein Elektromotor angeordnet sind. Pumpen- und Motorseite des Gehäuses der Luftpumpe der EP 0 711924 B1 sind jeweils durch Deckel zu verschließen. Der das Pumpenwerk antreibende Elektromotor ist mittels zweier Elastomerringe, die zwischen Elektromotor und Pumpengehäuse abgestützt sind, innerhalb der Pumpe weitgehend entkoppelt. Der Elektromotor dieser elektrisch angetriebenen Luftpumpe des Standes der Technik wird mit montiertem Pumpenrad, im eingebauten Zustand, bei noch nicht verschlossener Pumpenseite durch das Setzen von Auswuchtmarken an einem Laufrad des Pumpenwerks ausgewuchtet Dadurch, dass der Elektromotor im eingebauten Zustand mit montiertem Pumpenrad gewuchtet wird, kann das Zusammenwirken des Elektromotors mit weiteren Bauteilen der Luftpumpe berücksichtigt werden. Auf Grund des Wuchtvorganges am montierten Elektromotor lässt sich die Laufgüte einer solchen Luftpumpe durch die Verringerung der auftretenden Vibrationen zwar reduzieren, Exemplarstreuungen von Luftpumpe zu Luftpumpe lassen sich jedoch nicht vermeiden.From the EP 0 711 924 B1 An electrically driven air pump is known, which has a housing in which on one side a pumping plant and on the other side an electric motor are arranged. Pump and motor side of the housing of the air pump EP 0 711 924 B1 are each closed by lids. The electric motor driving the pump mechanism is largely decoupled within the pump by means of two elastomer rings, which are supported between the electric motor and the pump housing. The electric motor of this electrically driven air pump of the prior art is balanced with mounted impeller, when installed, not yet closed pump side by the setting of balancing marks on an impeller of the pump factory, characterized in that the electric motor is balanced in the installed state with mounted impeller can the interaction of the electric motor with other components of the air pump are taken into account. Due to the balancing process on the mounted electric motor, the running quality of such an air pump can be reduced by reducing the vibrations that occur, but it is not possible to avoid specimen scattering from air pump to air pump.

Aus der EP 0 470 265 A1 ist weiterhin bekannt, einen Elektromotor in zwei Ebenen, nämlich an seinem vorderen und hinteren Ende, mittels zweier scheibenförmiger Wuchtscheiben dynamisch auszuwuchten. Für einen Staubsaugermotor geht ein entsprechendes Auswuchten in mindestens zwei Ebenen aus der WO 00/72740 A1 hervor, die alle Gattungsmerkmale der Ansprüche 1 und 5 offenbart, wobei hier zum Einen der Rotor des Elektromotors und zum Anderen das jeweilige Flügelrad zum Ansaugen der Luft und/oder zum Kühlen des Elektromotors verwendet wird.From the EP 0 470 265 A1 is also known to dynamically balance an electric motor in two planes, namely at its front and rear ends, by means of two disc-shaped balancing discs. For a vacuum cleaner motor is a corresponding balancing in at least two levels from the WO 00/72740 A1 which discloses all the generic features of claims 1 and 5, wherein on the one hand the rotor of the electric motor and on the other hand, the respective impeller for sucking the air and / or for cooling the electric motor is used.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zur Herstellung einer elektrischen Sekundärluftpumpe mit verringerten Vibrationen und damit einhergehend auch verringerten Laufgeräuschen zu schaffen, wobei ein Auswuchten gegenüber dem Stand der Technik erleichtert bwz. verbessert ist. Ebenso ist es Aufgabe der vorliegenden Erfindung, eine solche Luftpumpe bereit zu stellen.The invention is based on the object to provide a method for producing an electric secondary air pump with reduced vibrations and, consequently, also reduced running noise, wherein a balancing over the prior art facilitates bwz. is improved. It is also an object of the present invention to provide such an air pump.

Die der Erfindung zu Grunde liegende Aufgabe wird durch ein Verfahren zur Herstellung einer elektrisch angetriebenen Sekundärluftpumpe mit den Merkmalen des Anspruchs 1 bzw. durch eine elektrisch angetriebene Luftpumpe mit den Merkmalen des Anspruchs 5 gelöst. Vorteilhafte Weiterbildungen und Ausführungsformen der Erfindung ergeben sich aus den in den Unteransprüchen aufgeführten Merkmalen.The object underlying the invention is achieved by a method for producing an electrically driven secondary air pump with the features of claim 1 and by an electrically driven air pump with the features of claim 5. Advantageous developments and embodiments of the invention will become apparent from the features listed in the dependent claims.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren zur Herstellung einer elektrisch angetriebenen Sekundärluftpumpe mit den Merkmalen des Anspruchs 1 verbessert die aus dem Stand der Technik bekannten Luftpumpen bezüglich ihrer Laufgüte. Bei dem erfindungsgemäßen Herstellungsverfahren wird die Luftpumpe, die ein Gehäuse aufweist, in dem ein Pumpenwerk mit zumindest einem Lüfterrad sowie ein das mindestens eine Lüfterrad antreibender Elektromotor integriert sind, mit dem bereits in das Gehäuse eingebauten Elektromotor durch Wuchten in mindestens zwei axial voneinander beabstandeten Ebenen ausgewuchtet. Erfindungsgemäßes ist vorgesehen, dass die Luftpumpe nach Montage des mindestens einen Lüfterrades auf eine Welle des Elektromotors bei eingebautem Elektromotor durch Wuchten an einem Lüfterrad und einer vom Lüfterrad axial beabstandeten Wuchtscheibe gewuchtet wird. Weiterhin ist eine Luftpumpe mit den Merkmalen des Anspruchs 5 beansprucht, bei der erfindungsgemäß im Bereich des dem Pumpenwerk abgewandten Endes der Antriebswelle des Elektromotors eine Wuchtscheibe angeordnet ist und ein Wuchten sowohl an dem Lüfterrad als auch an der dem Lüfterrad axial beabstandeten Wuchtscheibe erfolgt Auf Grund dieser Zwei-Ebenen-Wuchtung lässt sich die Wuchtgüte der erfindungsgemäßen elektrisch angetriebenen Luftpumpe deutlich erhöhen, so dass Exemplarstreuungen in den Laufgeräuschen der Pumpe weiter reduziert werden können.The inventive method for producing an electrically driven secondary air pump with the features of claim 1 improves known from the prior art air pumps with respect to their running quality. In the manufacturing method according to the invention, the air pump having a housing in which a pump unit with at least one fan and an electric motor driving the at least one fan are integrated, balanced with the already built into the housing electric motor by balancing in at least two axially spaced planes , According to the invention it is provided that the air pump is balanced after mounting the at least one fan wheel on a shaft of the electric motor with built-in electric motor by balancing on a fan and an axially spaced from the fan wheel balancing disk. Furthermore, an air pump is claimed with the features of claim 5, wherein according to the invention in the region of the pumping station remote from the end of the drive shaft of the electric motor, a balancing disc is arranged and a balancing takes place both on the fan and on the fan wheel axially spaced balancing disc due to this Two-level balancing can significantly increase the balancing quality of the electrically driven air pump according to the invention, so that specimen scattering in the running noise of the pump can be further reduced.

Vorteilhafte Weiterbildungen und Ausführungsbeispiele der Erfindung werden durch die in den Unteransprüchen enthaltenen Merkmale ermöglichtAdvantageous developments and embodiments of the invention are made possible by the features contained in the subclaims

Um einen deutlich erhöhten Auswuchtgrad zu erreichen, ist die Wuchtscheibe auf der vom Pumpenwerk abgewandten Seite der Welle des Elektromotors angebracht. Auf diese Weise besitzen die beiden Wuchtebenen einen großen axialen Abstand zueinander.In order to achieve a significantly increased degree of balance, the balancing wheel is mounted on the side facing away from the pump mechanism side of the shaft of the electric motor. In this way, the two balancing planes have a large axial distance from one another.

Der Elektromotor der Luftpumpe ist mittels elastischer Mittel vom Pumpengehause schwingungstechnisch entkoppelt. Dies führt zu einer weiteren Reduzierung der Vibrationen des Antriebsmotors auf das Pumpengehäuse. Bei dem erfindungsgemäßen Verfahren zur Herstellung der elektrisch angetriebenen Luftpumpe wird die Wuchtdrehzahl und/oder die Art der Wuchtaufnahme beim Wuchten der Luftpumpe auf die Eigenfrequenz der Entkopplungsmittel abgestimmt. Typischerweise wird die erfindungsgemäße Luftpumpe in einem Drehzahlbereich deutlich unterhalb der Resonanzfrequenz der Enticopplungsmittel ausgewuchtet. Auf diese Weise ist es möglich, den Einfluss der elastischen Kopplungsmittel zwischen Elektromotor und Pumpengehäuse auf das Laufverhalten der Luftpumpe zu minimieren.The electric motor of the air pump is decoupled by means of elastic means from the pump housing vibration technology. This leads to a further reduction of the vibrations of the drive motor to the pump housing. In the method according to the invention for producing the electrically driven air pump, the balancing speed and / or the type of balancing absorption during balancing of the air pump is matched to the natural frequency of the decoupling means. Typically, the air pump according to the invention is balanced in a speed range well below the resonant frequency of Enticopplungsmittel. In this way it is possible to minimize the influence of the elastic coupling means between the electric motor and the pump housing on the running behavior of the air pump.

Die elastischen Mittel zur Abstützung des Elektromotors sind darüber hinaus derart ausgebildet, dass das Pumpenwerk der Luftpumpe gegenüber dem Motorteil abgedichtet ist. In vorteilhafter Weise sind daher die elastischen Mittel in Form zweier, axial voneinander beabstandeter Elastomerringe ausgebildet. Der lüfterseitige Elastomerring besitzt in einer vorteilhaften Ausführungsform der erfindungsgemäßen Luftpumpe eine Dichtlippe, die das Pumpenwerk der Luftpumpe gegenüber dem Motorteil abdichtet.The elastic means for supporting the electric motor are also designed such that the pump unit of the air pump is sealed relative to the motor part. Advantageously, therefore, the elastic means in the form of two axially spaced-apart elastomeric rings are formed. The fan-side elastomeric ring has in an advantageous embodiment of the air pump according to the invention a sealing lip which seals the pumping unit of the air pump relative to the motor part.

Zumindest ein Elastomerring kann Mittel zur Drehmomentabstützung des Antriebsmotors aufweisen, so dass der Motor speziell in seiner Anlaufphase sicher fixiert ist.At least one elastomer ring may have means for torque support of the drive motor, so that the motor is securely fixed especially in its start-up phase.

Das beanspruchte Verfahren zur Herstellung einer elektrisch angetriebenen Luftpumpe liefert eine Luftpumpe, die auf Grund ihrer Komplettwuchtung in zwei Ebenen eine extrem hohe Laufruhe gewährleistet Auf Grund der starken Körperschallisolation, die durch die mechanische Entkopplung des Elektromotors und die zusätzliche, im montierten Zustand durchgeführte Komplettauswuchtung in zwei Ebenen erreicht wird, ist es möglich, die erfindungsgemäße Luftpumpe auch ohne aufwändige Entkopplungen für den Karosserieanbau zu verwenden.The claimed method of manufacturing an electrically driven air pump provides an air pump which, due to its complete balancing in two levels, ensures an extremely smooth running due to the strong structure-borne sound insulation caused by the mechanical decoupling of the electric motor and the additional, in the assembled state complete balancing achieved in two levels, it is possible to use the inventive air pump without complex decoupling for the body attachment.

Weitere Vorteile des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Luftpumpe sind den nachfolgenden Zeichnungen sowie der zugehörigen Beschreibung eines Ausführungsbeispiels einer erfindungsgemäßen Luftpumpe zu entnehmen.Further advantages of the method and the air pump according to the invention are shown in the following drawings and the associated description of an embodiment of an air pump according to the invention.

Zeichnungdrawing

In der Zeichnung ist ein Ausführungsbeispiel einer erfindungsgemäßen, elektrisch angetriebenen Luftpumpe zur Verdichtung von Verbrennungsluft dargestellt. Diese Luftpumpe sowie das erfindungsgemäße Verfahren zur Herstellung einer solchen Luftpumpe werden in der nachfolgenden Beschreibung näher erläutert. Die Figuren der Zeichnung, deren Beschreibung sowie die darauf gerichteten Ansprüche enthalten zahlreiche Merkmale in Kombination. Ein Fachmann wird diese Merkmale auch einzeln betrachten und zu sinnvollen, weiteren Kombinationen zusammenfassen.The drawing shows an embodiment of an inventive electrically driven air pump for the compression of combustion air is shown. This air pump and the inventive method for producing such an air pump will be explained in more detail in the following description. The figures of the drawing, the description and the claims directed thereto contain numerous features in combination. A person skilled in the art will also consider these features individually and combine them into meaningful, further combinations.

Es zeigt:

Figur 1
einen Längsschnitt durch eine erfindungsgemäße, elektrisch angetriebene Luftpumpe in montiertem Zustand,
Figur 2
einen Längsschnitt durch eine erfindungsgemäße Luftpumpe gemäß Figur 1 mit abgenommenen Deckeln an Lüfter- und Motorseite.
It shows:
FIG. 1
a longitudinal section through an inventive, electrically driven air pump in the assembled state,
FIG. 2
a longitudinal section through an inventive air pump according to FIG. 1 with removed covers on fan and motor side.

Figur 1 zeigt einen Längsschnitt durch ein Ausführungsbeispiel einer erfindungsgemäßen, elektrisch angetriebenen Luftpumpe 10 in montiertem Zustand. Die Luftpumpe 10 umfasst einen Pumpenteil 11 sowie einen Antriebs- oder Motorteil 15, die von einem Gehäuse 12 umgeben sind. Der Pumpenteil 11 besteht im wesentlichen aus einem Pumpenwerk 13 sowie entsprechenden Einlass- und Auslassöffnungen für die zu fördernde Luft. Das Pumpengehäuse 12, ist im Ausführungsbeispiel gemäß Figur 1 im Wesentlichen dreistückig ausgebildet. Neben einem zentralen Gehäuseteil 14, der den die Luftpumpe antreibenden Elektromotor 16 umgibt , weist das Gehäuse 12 einen pumpenwerkseitigen Deckel 20 sowie einen antriebsmotorseitigen Deckel 22 auf. Der pumpenwerkseitigen Deckel 20 besitzt eine zentrale Öffnung 44, durch die die zu verdichtende Luft angesaugt wird. Das Gehäuse 12 der erfindungsgemäßen Luftpumpe 10 ist in vorteilhafter Weise aus einem Kunststoff gefertigt FIG. 1 shows a longitudinal section through an embodiment of an inventive electrically driven air pump 10 in the assembled state. The air pump 10 comprises a pump part 11 and a drive or motor part 15, which are surrounded by a housing 12. The pump part 11 consists essentially of a pump unit 13 and corresponding inlet and outlet openings for the air to be delivered. The pump housing 12 is, according to the embodiment FIG. 1 essentially formed in three pieces. In addition to a central housing part 14, which surrounds the electric motor 16 driving the air pump, the housing 12 has a pump-side cover 20 and a drive motor-side cover 22. The pump-side lid 20 has a central opening 44 through which the air to be compressed is sucked. The housing 12 of the air pump 10 according to the invention is advantageously made of a plastic

In den zentralen Gehäuseteil 14 der erfindungsgemäßen Luftpumpe 10 ist der antreibende Elektromotor 16 eingebracht, der im Ausführungsbeispiel der Figur 1 als Innenläufer ausgebildet ist und zumindest über einen Rotor 19 und einen, den Rotor umgreifenden Stator 21 verfügt. Der Stator 21 ist in dem Ausführungsbeispiel der erfindungsgemäßen Pumpe nach Figur 1 durch Magnete 25 realisiert. Das Motorgehäuse 17 des Elektromotors 16 wird gebildet durch ein Polgehäuse 30 des Motors. Andere Motortypen als der im Ausführungsbeispiel gezeigte Innenläufere sind für die erfindungsgemäße Luftpumpe aber ebenso denkbar. Der Elektromotor 16 treibt über eine Welle 23 das Pumpenwerk 13 zur Verdichtung der Luft an.In the central housing part 14 of the air pump 10 according to the invention, the driving electric motor 16 is inserted, which in the embodiment of FIG. 1 is designed as an internal rotor and at least via a rotor 19 and a, the rotor encompassing stator 21 has. The stator 21 is in the embodiment of the pump according to the invention after FIG. 1 realized by magnets 25. The motor housing 17 of the electric motor 16 is formed by a pole housing 30 of the motor. Other motor types than the internal rotor shown in the embodiment are for the inventive air pump but also conceivable. The electric motor 16 drives via a shaft 23, the pump unit 13 to compress the air.

Der Elektromotor 16 ist über elastische Mittel 24 vom Gehäuse 12 der Luftpumpe entkoppelt. Im Ausführungsbeispiel der Figur 1 werden zur Vibrationsdämpfung Elastomerringe 26 bzw. 28 genutzt. Die Elastomerringe 26 bzw. 28 sind auf den Stirnseiten des Polgehäuses 30 des Elektromotors 16 zwischen Polgehäuse 30 und Pumpengehäuse 12 platziert. Die Elastomerringe sind dabei derart ausgeformt und eingebracht, dass sowohl eine radiale als auch eine axiale Abstützung des Elektromotors 16 im Pumpengehäuse erfolgt. Die motorseitige Entkopplung 28 wird in ihrer Formgebung so ausgeführt, dass eine Drehmomentabstützung des Elektromotors 16 am Gehäuse gegeben ist. Die Drehmomentabstützung kann selbstverständlich auch an dem pumpenwerkseitigen Elastomerring 26 oder an beiden Elastomerringen ausgebildet sein. Des weiteren besitzt insbesondere der pumpenwerksseitige Elastomerring 26 eine Dichtlippe 27, die dazu führt, dass die elastischen Mittel 24 zur Verbesserung der Laufruhe der erfindungsgemäßen Luftpumpe 10 gleichzeitig auch als Abdichtelemente zwischen dem Motorteil 15 und dem Pumpenwerk 13 der erfindungsgemäßen Luftpumpe dienen. In vorteilhafter Weise ist der pumpenwerksseitige Elastomerring 26 im Bereich eines dem Pumpenwerk 13 zugerichteten Lagerschildes 32 des Antriebsmotors angeordnet.The electric motor 16 is decoupled via elastic means 24 from the housing 12 of the air pump. In the embodiment of FIG. 1 Elastomer rings 26 and 28 are used for vibration damping. The elastomer rings 26 and 28 are on the end faces of the pole housing 30 of the electric motor 16 between the pole housing 30 and Pump housing 12 is placed. The elastomer rings are formed and introduced such that both a radial and an axial support of the electric motor 16 takes place in the pump housing. The motor-side decoupling 28 is executed in its shape so that a torque support of the electric motor 16 is provided on the housing. The torque support can of course also be formed on the pump-side elastomer ring 26 or on both elastomer rings. Furthermore, in particular, the pumping-side elastomer ring 26 has a sealing lip 27, which causes the elastic means 24 to improve the smoothness of the air pump 10 according to the invention also serve as sealing elements between the motor part 15 and the pump unit 13 of the air pump according to the invention. In an advantageous manner, the pumping-side elastomeric ring 26 is arranged in the region of a bearing plate 32 of the drive motor which is aligned with the pumping station 13.

Nach der Montage des mit den Entkopplungsringen 26 bzw. 28 versehenden Motors 16 in das Pumpengehäuse 12 wird ein Haltedeckel 34 auf der dem Pumpenwerk 13 abgewandten Seite des Motorgehäuses 17 installiert. Der Haltedeckel 34 wird an den Elastomerring 28 angedrückt und mit dem zentralen Gehäuseteil 14 des Pumpengehäuses 12 verrastet. Auf diese Weise wird der Elektromotor 16 in axialer Richtung fixiert.After assembly of the decoupling rings 26 or 28 providing motor 16 in the pump housing 12, a retaining cover 34 is installed on the side facing away from the pump unit 13 of the motor housing 17. The retaining cover 34 is pressed against the elastomer ring 28 and locked with the central housing part 14 of the pump housing 12. In this way, the electric motor 16 is fixed in the axial direction.

Die Welle 23 des Antriebsmotors 16 der erfindungsgemäßen Luftpumpe 10 ist an beiden axialen Enden des Motorgehäuses 17 aus diesem herausgeführt und trägt auf seiner einen, in der Abbildung der Figur 1 rechten Seite, Laufräder 36 bzw. 38 des Pumpenwerks 13. Das Pumpenwerk 13 der erfindungsgemäßen Luftpumpe gemäß dem Ausführungsbeispiel der Figur 1 ist zweistufig ausgeführt. Zwischen den beiden Laufrädern 36 bzw. 38 des Pumpenwerks ist ein Leitrad 40 angeordnet, welches fest verbindbar mit dem Gehäuse 12 der Luftpumpe ist. Das Leitrad 40 weist Strukturen in Form von Kanälen 42 auf, die dafür sorgen, dass die vom ersten Laufrad 36 radial nach außen geförderte Luft vom äußeren Bereich des ersten Laufrades in den inneren Laufradbereich des zweiten Laufrades 38 gefördert wird, so dass eine effektive zweistufige Verdichtung der angesaugten Luft erfolgen kann. Die durch das zweite Laufrad 38 radial nach außen geführte, verdichtete Luft, wird in einen, in Umfangsrichtung des Gehäuses 12 der Luftpumpe 10 verlaufenden, ringförmigen Luftleitkanal 18 gefördert, dessen Durchmesser in Umfangsrichtung des Pumpengehäuses 12 zunimmt. Dieser Luftleitkanal 18 (Volute) mündet in einen, in Figur 1 nicht weiter dargestellten druckseitigen Anschluss der Luftpumpe.The shaft 23 of the drive motor 16 of the air pump 10 according to the invention is led out of this at both axial ends of the motor housing 17 and carries on its one, in the figure of FIG. 1 right side, wheels 36 and 38 of the pump factory 13. The pump unit 13 of the air pump according to the invention according to the embodiment of FIG. 1 is executed in two stages. Between the two wheels 36 and 38 of the pump factory, a stator 40 is arranged, which is firmly connected to the housing 12 of the air pump. The stator 40 has structures in the form of channels 42, which ensure that the radially outwardly from the first impeller 36 conveyed air from the outer region of the first impeller in the inner impeller region of the second impeller 38 is promoted, so that an effective two-stage compression the sucked air can take place. The radially outwardly guided by the second impeller 38, compressed air is conveyed in a, in the circumferential direction of the housing 12 of the air pump 10 extending, annular air duct 18 whose diameter in the circumferential direction of the pump housing 12 increases. This air duct 18 (volute) opens into a, in FIG. 1 not shown on the pressure side connection of the air pump.

Die erfindungsgemäße Luftpumpe 10 ist nicht auf ein zweistufiges Pumpenwerk 13 beschränkt. Weitere oder aber auch weniger Pumpenstufen können selbstverständlicher Weise ebenso in einer erfindungsgemäßen Pumpe verwendet werden. Im Falle eines mehrstufigen Pumpenwerkes ist dabei jedem weiteren Laufrad auch ein weiteres Leitrad zugeordnet, welches die radial nach außen geförderte Luft des vorgeschalteten Laufrades in den radial innen liegenden Bereich des nachgeschalteten Laufrades fördert.The air pump 10 according to the invention is not limited to a two-stage pump unit 13. More or less pump stages can of course also be used in a pump according to the invention. In the case of a multi-stage pumping plant, each further impeller is also assigned a further stator, which conveys the radially outwardly conveyed air of the upstream impeller into the radially inner region of the downstream impeller.

Der pumpenwerkseitige Deckel 20 ist derart ausgestaltet, dass auf seiner Innenseite, d.h. der dem ersten Laufrad 36 des Pumpenwerks 13 zugewandten Seite, Strukturen 47 ausgebildet sind, die ein Rückströmen der über das erste Laufrad verdichteten Luft in den Ansaugbereich des Pumpenwerkes verhindern.The pump-side lid 20 is designed such that on its inside, i. the side facing the first impeller 36 of the pump unit 13, structures 47 are formed, which prevent a backflow of the air compressed via the first impeller in the intake of the pump unit.

Das Gehäuse der Luftpumpe wird pumpenwerkseitig durch einen Deckel 20 verschlossen, der eine zentrale Öffnung 44 zur Ansaugung der zu verdichtenden Luft aufweist. Die zentrale Öffnung 44 im Deckel 20 des Pumpengehäuses 12 ist im Ausführungsbeispiel der Figur 1 als Stutzen 46 ausgebildet, der es ermöglicht, entsprechende Verbindungsmittel, wie beispielsweise Schläuche, schnell und leicht an der erfindungsgemäßen Pumpe zu installieren.The housing of the air pump is closed on the pumping side by a cover 20 which has a central opening 44 for sucking the air to be compressed. The central opening 44 in the cover 20 of the pump housing 12 is in the embodiment of FIG. 1 designed as a nozzle 46, which makes it possible to install corresponding connection means, such as hoses, quickly and easily to the pump according to the invention.

Das Pumpengehäuse 12, das Leitrad 40 des Pumpenwerks 13 sowie der pumpenwerksseitige Deckel 20 werden gegen Ende des erfindungsgemäßen Verfahrens zur Herstellung einer elektrisch angetriebenen Luftpumpe miteinander verbunden. Als Verbindungstechnik sind hier alle dem einschlägigen Fachmann bekannten Techniken einsetzbar.The pump housing 12, the stator 40 of the pump unit 13 and the pump-side cover 20 are connected to each other towards the end of the inventive method for producing an electrically driven air pump. As connection technology here all known to those skilled in the techniques can be used.

Auch auf der dem Pumpenwerk 13 abgewandten Seite des Motorgehäuses 17 ist die Antriebswelle 23 des Elektromotors 16 über das dortige Wellenlager 48 hinaus aus dem Motorgehäuse 17 herausgeführt. Im Bereich des dem Pumpenwerk 13 abgewandten Endes der Antriebswelle 23 ist eine Wuchtscheibe 50 auf die Antriebswelle 23 des Motors 16 installiert, die drehfest mit der Antriebswelle verbunden ist. Diese Wuchtscheibe 50 kann aus Metall, beispielsweise aus einem Blech, gefertigt sein und hat einen Durchmesser, der typischerweise kleiner ist als der Durchmesser des Rotors 19 des Antriebsmotors 16. Die Wuchtscheibe 50 ist durch eine dem Fachmann bekannte Befestigungsmethode drehfest mit der Antriebswelle 23 verbunden. An der Wuchtscheibe 50 können Wuchtmarken, beispielsweise durch Materialabtrag, zum Ausgleich der Unwucht der erfindungsgemäßen Luftpumpe10, gesetzt werden. Das dem Pumpenwerk 13 abgewandte Ende des Gehäuses 12 der erfindungsgemäßen Luftpumpe 10 wird nach erfolgter Montage der Luftpumpe durch einen Deckel 22 verschlossen.Also on the side facing away from the pump unit 13 of the motor housing 17, the drive shaft 23 of the electric motor 16 is led out via the local shaft bearing 48 out of the motor housing 17. In the area of the pumping station 13 remote from the end of the drive shaft 23 is a balancing disk 50 is installed on the drive shaft 23 of the motor 16, which is rotatably connected to the drive shaft. This balancing disc 50 may be made of metal, for example of a sheet metal, and has a diameter which is typically smaller than the diameter of the rotor 19 of the drive motor 16. The balancing disc 50 is known to one skilled in the art Fixing method rotatably connected to the drive shaft 23. Balancing marks, for example by removal of material, can be placed on the balancing disk 50 to compensate for the imbalance of the air pump 10 according to the invention. The pump unit 13 remote from the end of the housing 12 of the air pump 10 according to the invention is closed by a cover 22 after installation of the air pump.

Bei dem erfindungsgemäßen Verfahren zur Herstellung einer elektrisch angetriebenen Luftpumpe wird der montierte Antriebsmotor 16 zuerst mit den Entkopplungsringen 26 bzw. 28 versehen. Der Elektromotor 16 für sich kann bereits vorgewuchtet sein, so dass beispielsweise durch Materialabtrag oder-auftrag an der Motorwelle bzw. am Rotor oder auch am Anker des Motors ein erster Wuchtvorgang durchgeführt wird. Alternativer Weise kann auf eine Vorwuchtung des Elektromotors 16 für sich verzichtet werden, so dass lediglich die noch zu beschreibende Auswuchtung der Luftpumpe 10 mit montiertem Elektromotor 16 und montiertem Pumpenrad 36 beziehungsweise 38 durchgeführt zu werden braucht. Der vormontierte Elektromotor 16 wird durch eine dem Pumpenwerks 13 abgewandte Öffnung 52 des Pumpengehäuses 12 in das Pumpengehäuse 12 eingeführt und durch Verrastung des Haltedeckels 34 am Gehäuse in axialer und radialer Richtung gesichert. Dabei ist die Verrastung des Haltedeckels 34 so zu wählen, dass die Elastomerringe 26 bzw. 28 unter einer gewissen Vorspannung gegen die Innenseite des Pumpengehäuses 12 gedrückt werden. Anschließend werden das Laufrad 38, das Leitrad 40 und das Laufrad 36 auf das pumpenwerkseitige Ende der Antriebswelle 23 des Elektromotors 16 montiert.In the method according to the invention for producing an electrically driven air pump, the assembled drive motor 16 is first provided with the decoupling rings 26 and 28, respectively. The electric motor 16 per se can already be pre-balanced so that a first balancing operation is carried out, for example, by removal of material or material on the motor shaft or on the rotor or also at the armature of the motor. Alternatively, pre-balancing of the electric motor 16 can be dispensed with, so that only the balancing of the air pump 10 to be described with the mounted electric motor 16 and the mounted pump wheel 36 or 38 need be performed. The preassembled electric motor 16 is inserted through an opening 52 of the pump housing 12 facing away from the pump housing 13 into the pump housing 12 and secured in the axial and radial direction by latching of the retaining cover 34 on the housing. The locking of the retaining cover 34 is to be selected so that the elastomer rings 26 and 28 are pressed under a certain bias against the inside of the pump housing 12. Subsequently, the impeller 38, the stator 40 and the impeller 36 are mounted on the pumping unit end of the drive shaft 23 of the electric motor 16.

Erfindungsgemäß ist bei diesem Verfahren zur Herstellung einer elektrisch angetriebenen Luftpumpe 10 vorgesehen, dass die Luftpumpe bei eingebautem Elektromotor 16 mit montiertem Pumpenwerk 13 gewuchtet wird.According to the invention, in this method for producing an electrically driven air pump 10, it is provided that the air pump is balanced with the pump unit 13 installed when the electric motor 16 is installed.

Figur 2 zeigt die erfindungsgemäße Pumpe mit eingebautem Elektromotor 16 sowie montiertem Pumpenwerk 13, wie sie zur Auswuchtung beispielsweise in eine Wuchtmaschine eingesetzt wird. Der Wuchtvorgang wird nacheinander bzw. parallel in zwei, im wesentlichen senkrecht zur Antriebswelle 23 der Luftpumpe 10 angeordneten Wuchtebenen A bzw. B durchgeführt. Die Wuchtebene A wird gebildet durch die Wuchtscheibe 50 an dem dem Pumpenwerk 13 abgewandten Ende der Antriebswelle 23. Die zweite Wuchtebene B wird im Ausühmngsbeispiel der Figur 2 durch die Deckscheibe 54 des Laufrades 36 des Pumpenwerks 13 der erfindungsgemäßen Luftpumpe 10 gebildet. Alternativer Weise kann die Wuchtebene B aber auch mit der Grundscheibe 56 des Laufrades 36 zusammen fallen. FIG. 2 shows the pump according to the invention with built-in electric motor 16 and mounted pump unit 13, as used for balancing example in a balancing machine. The balancing operation is carried out successively or in parallel in two, substantially perpendicular to the drive shaft 23 of the air pump 10 arranged balancing planes A and B respectively. The balancing plane A is formed by the balancing wheel 50 at the end of the drive shaft 23 facing away from the pump mechanism 13. The second balancing plane B is described in the exemplary embodiment of FIG FIG. 2 through the cover plate 54 of the impeller 36 of the pump unit 13 of the invention Air pump 10 is formed. Alternatively, the balancing plane B can also coincide with the base disk 56 of the impeller 36.

In vorteilhafter Weise wird die erfindungsgemäße Luftpumpe 10 gewuchtet durch das Setzen von Auswuchtmarken in einer bzw. beiden Wuchtebenen. Dazu kann beispielsweise Material von der Wuchtscheibe 50 bzw. der Deckscheibe 54 "abgeknabbert" werden. Die Wuchtdrehzahl und die Art der Wuchtaufnahme ist hierbei auf die Eigenfrequenz der Entkopplung des Elektromotors 16 durch die elastischen Mittel 24 abgestimmt. Insbesondere verbietet sich das Auswuchten der erfindungsgemäßen Luftpumpe im Drehzahlbereich der Eigenfrequenz der Entkopplungsmittel 24.Advantageously, the air pump 10 according to the invention is balanced by the setting of balancing marks in one or both balancing planes. For this purpose, for example, material from the balancing disk 50 or the cover disk 54 can be "nibbled". The balancing speed and the type of balancing absorption is matched to the natural frequency of the decoupling of the electric motor 16 by the elastic means 24. In particular, the balancing of the air pump according to the invention in the speed range of the natural frequency of the decoupling means 24 is prohibited.

Ein Materialabtrag durch Abdampfen mittels eines hochintensiven Licht- bzw. Laserstrahls ist eine weitere mögliche Methode für das Setzen von Auswuchtmarken bei dem erfindungsgemäßen Verfahren. Desweiteren ist es auch möglich, Auswuchtmarken durch das Aufbringen vom Klebstoffpunkten, insbesondere an einem Lüfterrad bzw. der Wuchtscheibe zu realisieren.A material removal by evaporation by means of a high-intensity light or laser beam is another possible method for setting balance marks in the method according to the invention. Furthermore, it is also possible to realize balancing marks by the application of the adhesive points, in particular on a fan or the balancing disk.

Nach erfolgter Wuchtung wird das Pumpengehäuse 12 durch Montage der antriebsmotorseitigen und pumpenwerksseitigen Deckel 22 beziehungsweise 20 komplettiert. Bei der Montage des pumpenwerkseitigen Deckels 20 wird das Leitrad 40 axial und radial zwischen dem Gehäuseteil 14 und dem Deckel 20 fixiert, so dass dieses gegen Verdrehen gesichert ist. Beispielsweise kann das Leitrad 40 an seinem äußeren Umfang 58 in entsprechende Ausnehmungen 60 des zentralen Gehäuseteils 14 des Pumpengehäuses 12 bzw. in Ausnehmungen 62 des pumpenwerkseitigen Deckels 20 eingepasst und durch die Montage des Deckels 20 eingeklemmt werden. Zur Befestigung der das Pumpengehäuse 12 komplettierenden Deckel 20 beziehungsweise 22 stehen dem Fachmann eine Vielzahl von Möglichkeiten zur Verfügung. Auszugsweise und keinesfalls abschließend seien hier das Verklammern, Verschrauben, Vernieten, Verkleben, Ultraschallschweißen bzw. Reibschweißen als mögliche Befestigungsmethoden erwähnt.After balancing the pump housing 12 is completed by mounting the drive motor side and pump-side cover 22 and 20 respectively. When mounting the pump-side cover 20, the stator 40 is fixed axially and radially between the housing part 14 and the lid 20 so that it is secured against rotation. For example, the stator 40 can be fitted at its outer periphery 58 in corresponding recesses 60 of the central housing part 14 of the pump housing 12 and in recesses 62 of the pump-side cover 20 and clamped by the assembly of the lid 20. For fixing the pump housing 12 completing cover 20 and 22 are available to the expert a variety of ways. In a nutshell and in no way conclusive, the bracing, screwing, riveting, gluing, ultrasonic welding or friction welding are mentioned here as possible fastening methods.

Durch die Komplettgebläsewuchtung in zwei Ebenen bei bereits weitgehend montierter Luftpumpe ist eine deutliche Verbesserung der Laufruhe der erfindungsgemäßen Luftpumpe erzielbar. Insbesondere können die erst durch Kupplungseffekte des eingebauten Antriebsmotors verursachten Unwuchten, sowie die auf Grund der mechanischen Entkopplungs des Elektromotors durch die elastische Mittel auftretenden Vibrationen summarisch korrigiert werden, so dass die Exempiarstreuungen hinsichtlich Vibrationen und Laufgeräuschen in engen Grenzen gehalten werden können. Dies führt in vorteilhafter Weise dazu, dass die erfindungsgemäße Luftpumpe ohne aufwändige, Entkopplung für den Karosserieeinbau eingesetzt werden kann.By the complete blower balancing in two levels with already largely mounted air pump a significant improvement in the smoothness of the air pump according to the invention can be achieved. In particular, the imbalances caused only by coupling effects of the installed drive motor, as well as due to the mechanical decoupling of the electric motor by the elastic means occurring vibrations are summarily corrected, so that the Exempiarstreuungen can be kept within narrow limits in terms of vibration and noise. This leads advantageously to the fact that the air pump according to the invention can be used without complex, decoupling for the body installation.

Die erfindungsgemäße Luftpumpe ist nicht auf die in den Figuren dargestellten Ausführungsbeispiele beschränkt.The air pump according to the invention is not limited to the embodiments illustrated in the figures.

Insbesondere ist die erfindungsgemäße Luftpumpe nicht auf die Verwendung eines zweistufigen Pumpenwerkes beschränkt.In particular, the air pump according to the invention is not limited to the use of a two-stage pumping station.

Das erfindungsgemäße Verfahren zur Herstellung einer elektrisch angetriebenen Luftpumpe ist nicht beschränkt auf den mechanischen Massenabtrag am Lüfterrad bzw. der Wuchtscheibe. Neben dem Aufbringen von Wuchtmassen ist beispielsweise auch ein Abschmelzen von Material zur Verbesserung der Wuchtgüte, insbesondere ein optisch induziertes Abschmelzen, denkbar.The inventive method for producing an electrically driven air pump is not limited to the mechanical mass removal on the fan or the balancing disk. In addition to the application of balancing masses, for example, a melting of material to improve the balancing quality, in particular an optically induced melting, conceivable.

Claims (9)

  1. Method for producing a secondary air pump (10) for a motor vehicle having an internal combustion engine, the air pump (10) having a housing (12) in which a pump mechanism (13) with at least one fan wheel (36, 38) and an electric motor (16) driving the at least one fan wheel (36, 38) are arranged, and the air pump (10), together with the electric motor (16) installed in the housing (12), being balanced by balancing in at least two planes (A, B) spaced axially apart from one another, characterized in that, after the at least one fan wheel (36, 38) has been mounted onto a shaft (23) of the electric motor (16), with the electric motor (16) installed, the air pump (10) is balanced by balancing on a fan wheel (36, 38) and a balancing disc (50) spaced axially apart from the fan wheel (36, 38).
  2. Method for producing an electrically driven air pump according to Claim 1, characterized in that the balancing disc (50) is attached on that side of the shaft (23) of the electric motor (16) which faces away from the pump mechanism (13).
  3. Method for producing an electrically driven air pump according to one of the preceding claims, characterized in that the electric motor (16) is decoupled from the pump housing (12) by elastic means (24).
  4. Method for producing an electrically driven air pump according to Claim 3, characterized in that the balancing rotational speed and/or the type of balancing take-up during the balance of the air pump (10) are/is coordinated with the characteristic frequency of the decoupling means (24).
  5. Electrically driven air pump (10), in particular a secondary air pump (10) for a motor vehicle having an internal combustion engine, with a housing (12) and with an electric motor (16) which is integrated in the housing (12) and which is supported in the pump housing (12) by elastic means (24), and with a pump mechanism (13) having at least one fan wheel (36, 38) fastened on a shaft (23) of the drive motor (16), characterized in that a balancing disc (50) is arranged in the region of that end of the drive shaft (23) of the electric motor (16) which faces away from the pump mechanism (13), and balancing takes place both on the fan wheel (36, 38) and on the balancing disc (50) spaced axially apart from the fan wheel (36, 38).
  6. Electrically driven air pump according to Claim 5, characterized in that elastic means (24) are provided which, in order to support the electric motor (16), seal off the pump mechanism (13) of the air pump (10) with respect to the motor part (15).
  7. Electrically driven air pump according to one of the preceding Claims 5 to 8, characterized in that the elastic means (24) for supporting the electric motor (16) are designed in the form of two elastomeric rings (26, 28) spaced axially apart from one another.
  8. Electrically driven air pump according to Claim 7, characterized in that a sealing lip (27) is formed on the elastomeric ring (26) located on the fan-wheel side.
  9. Electrically driven air pump according to either one of Claims 7 and 8, characterized in that means for supporting the torque of the drive motor (16) are formed at least on one elastomeric ring (26, 28).
EP03788774A 2002-12-18 2003-11-07 Electrically driven air pump and method for the production thereof Expired - Lifetime EP1576293B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10259179A DE10259179A1 (en) 2002-12-18 2002-12-18 Electrically driven air pump and method for producing an electrically driven air pump
DE10259179 2002-12-18
PCT/DE2003/003678 WO2004057195A1 (en) 2002-12-18 2003-11-07 Electrically driven air pump and method for the production thereof

Publications (2)

Publication Number Publication Date
EP1576293A1 EP1576293A1 (en) 2005-09-21
EP1576293B1 true EP1576293B1 (en) 2012-08-22

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US (1) US7520734B2 (en)
EP (1) EP1576293B1 (en)
JP (1) JP2006510839A (en)
DE (1) DE10259179A1 (en)
WO (1) WO2004057195A1 (en)

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Also Published As

Publication number Publication date
WO2004057195A1 (en) 2004-07-08
JP2006510839A (en) 2006-03-30
US20060115368A1 (en) 2006-06-01
EP1576293A1 (en) 2005-09-21
DE10259179A1 (en) 2004-07-08
US7520734B2 (en) 2009-04-21

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