EP1576293A1 - Pompe a air a commande electrique et son procede de production - Google Patents

Pompe a air a commande electrique et son procede de production

Info

Publication number
EP1576293A1
EP1576293A1 EP03788774A EP03788774A EP1576293A1 EP 1576293 A1 EP1576293 A1 EP 1576293A1 EP 03788774 A EP03788774 A EP 03788774A EP 03788774 A EP03788774 A EP 03788774A EP 1576293 A1 EP1576293 A1 EP 1576293A1
Authority
EP
European Patent Office
Prior art keywords
air pump
electrically driven
balancing
housing
electric motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03788774A
Other languages
German (de)
English (en)
Other versions
EP1576293B1 (fr
Inventor
Ulrich Luedtke
Claudius Muschelknautz
Fabrice Burg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1576293A1 publication Critical patent/EP1576293A1/fr
Application granted granted Critical
Publication of EP1576293B1 publication Critical patent/EP1576293B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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
    • 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
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations

Definitions

  • the invention relates to a method for producing an electrically driven air pump, in particular a method for producing a secondary air pump for a motor vehicle with an internal combustion engine, with the features of the preamble of claim 1 and to such an electrically driven air pump with the features of the preamble of claim 8.
  • Generic air pumps or blowers are used, for example, as secondary air pumps or secondary air blowers for blowing additional air into the exhaust duct of an internal combustion engine of a motor vehicle. This method minimizes the formation of nitrogen oxides or leads to a reduction in the
  • Eliminate carbon monoxide Eliminate carbon monoxide.
  • the secondary air supply in the exhaust system practically starts an afterburning of the exhaust gases, in the course of which the unburned carbon monoxides or hydrocarbons in the engine, i.e. be reoxidized. Afterburning by a secondary air supply system also increases the exhaust gas temperature, so that the operating temperature required for a regulated catalytic converter is reached early. Higher temperatures in the exhaust system allow the regulated catalytic converter to respond more quickly so that it can perform its task of eliminating pollutants earlier in the driving cycle.
  • the blower and in particular the electric motor driving the blower have to make extremely high demands on the synchronism and thus on the quality of the balancing process.
  • the vibrations generated in the air pump due to imbalance are transmitted to the components connected to the air pump and thus generate increased running noise. If necessary, it can be necessary to mechanically decouple the entire air pump from other components in order to avoid vibration transmission to the vehicle and especially to the passenger compartment.
  • Air pump for example, by removing or applying material to a fan wheel of the pumping station.
  • An electrically driven air pump is known from EP 0 711 924 B1, which has a housing in which a pump unit is arranged on one side and an electric motor is arranged on the other side.
  • the pump and motor side of the housing of the air pump of EP 0 711 924 Bl are each to be closed by a cover.
  • the electric motor driving the pump unit 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 the pump wheel installed, in the installed state, with the pump side not yet closed, by placing balancing marks on an impeller of the pump unit.
  • the electric motor is balanced with the pump wheel installed in the installed state, the interaction of the electric motor with other components of the air pump can be 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 specimen scatter from air pump to air pump cannot be avoided.
  • the invention is based on the object of providing a method for producing an electric air pump with reduced vibrations and, as a result, also reduced running noise. It is also an object of the present invention to provide such an air pump.
  • the method according to the invention for producing an electrically driven air pump with the features of claim 1 improves the running quality of the air pumps known from the prior art.
  • the air pump which has a housing in which a pump unit with at least one fan wheel and an electric motor driving the at least one fan wheel are integrated, is balanced with the electric motor already built into the housing by balancing in at least two axially spaced planes. Due to this two-level balancing, the
  • Air pump after mounting the at least one fan wheel on the shaft of the electric motor, with the electric motor already installed, balanced by balancing on a fan wheel and the additional balancing in a balancing plane axially spaced from the fan wheel.
  • the electrically driven air pump according to the invention advantageously has a balancing disk in the region of the end of the drive shaft of the electric motor facing away from the pumping station.
  • the air pump can be balanced by material removal, for example by a purely mechanical material removal on the fan wheel or on the balancing disk.
  • the balancing disk of the air pump according to the invention advantageously consists at least partially of a metal, which can be reduced in its mass by mechanical removal (“nibbling”), so that the moment of inertia of the balancing disk or the moment of inertia of the fan wheel can be adapted to the requirements of the balancing process ,
  • the balancing disk is attached to the side of the shaft of the electric motor facing away from the pumping station. In this way, the two balancing planes have a large axial distance from one another.
  • the electric motor of the air pump is decoupled from the pump housing in terms of vibration by means of elastic means. This leads to a further reduction in the vibrations of the drive motor on the pump housing.
  • the balancing speed and / or the type of balancing when balancing the air pump is matched to the natural frequency of the decoupling means.
  • the air pump according to the invention is typically balanced in a speed range significantly below the resonance frequency of the decoupling means. In this way it is possible to minimize the influence of the elastic coupling means between the electric motor and pump housing on the running behavior of the air pump.
  • the elastic means for supporting the electric motor are also designed such that the pumping unit of the air pump is sealed off from the motor part.
  • the elastic means are therefore advantageously designed in the form of two axially spaced apart elastomer rings.
  • the elastomer ring on the fan side has a
  • Sealing lip that seals the pump unit of the air pump against the motor part.
  • At least one elastomer ring can have means for torque support of the drive motor, so that the motor is securely fixed especially in its start-up phase.
  • the elastomer rings are each arranged between the pole housing of the drive motor and the pump housing of the air pump.
  • the elastomer rings are arranged on the axial end faces of the pole housing of the drive motor.
  • the elastomer rings are designed as axial
  • Radial support rings formed so that the electric motor is fixed in the axial as well as in the radial direction by the elastic support means.
  • the electrically driven air pump according to the invention has a housing which has a cover on the fan wheel side and a cover on the motor side.
  • the method according to the invention for producing an electrically driven air pump allows the completely assembled air pump to be completely balanced in two planes with the covers not yet installed. Imbalances that arise, for example, only when the electric motor is installed in the pump housing can be largely eliminated by the resulting complete balancing. Scatter in the
  • the running quality of an air pump that results from the mechanical decoupling elements can be minimized by the manufacturing method according to the invention.
  • the pump housing is completed and closed by a cover on the fan wheel side and a motor side.
  • the claimed method for producing an electrically driven air pump provides an air pump which, due to its complete balancing on two levels, ensures extremely smooth running. Due to the strong structure-borne noise insulation, which is achieved by the mechanical decoupling of the electric motor and the additional, in the assembled state, complete balancing carried out in two levels, it is possible to use the air pump according to the invention without complex decoupling for the bodywork.
  • Air pumps are shown in the following drawings and the associated description of an embodiment of an air pump according to the invention.
  • the drawing shows an exemplary embodiment of an electrically driven air pump according to the invention for compressing combustion air.
  • This air pump and the method according to the invention for producing such an air pump are explained in more detail in the description below.
  • the figures of the drawing, their description and the claims directed to them contain numerous features in combination. A person skilled in the art will also consider these features individually and combine them into meaningful, further combinations. It shows:
  • FIG. 1 shows a longitudinal section through an electrically driven air pump according to the invention in the assembled state
  • Figure 2 shows a longitudinal section through an air pump according to the invention
  • FIG. 1 shows a longitudinal section through an embodiment of an electrically driven air pump 10 according to the invention 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 essentially consists of a pump unit 13 and corresponding inlet and outlet openings for the air to be conveyed.
  • the pump housing 12 is essentially of three parts.
  • a central housing part 14 which the
  • Air pump driving electric motor 16 surrounds, the housing 12 has a cover 20 on the pumping station side and a cover 22 on the drive motor side.
  • the cover 20 on the pumping station side has a central opening 44 through which the air to be compressed is sucked in.
  • the housing 12 of the air pump 10 according to the invention is advantageously made of a plastic
  • the driving electric motor 16 is introduced into the central housing part 14 of the air pump 10 according to the invention.
  • it is designed as an inner rotor and has at least one rotor 19 and one stator 21 encompassing the rotor.
  • the stator 21 is in the exemplary embodiment of the invention
  • the motor housing 17 of the electric motor 16 is formed by a pole housing 30 of the motor. Motor types other than the inner rotor shown in the exemplary embodiment are also conceivable for the air pump according to the invention.
  • the electric motor 16 drives the pump unit 13 via a shaft 23 to compress the air.
  • the electric motor 16 is decoupled from the housing 12 of the air pump via elastic means 24.
  • 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 placed.
  • the elastomer rings are shaped and introduced in such a way that both radial and axial support of the electric motor 16 takes place in the pump housing.
  • the shape of the decoupling 28 on the motor side is designed such that the electric motor 16 is supported on the housing in terms of torque.
  • the torque support can of course also be formed on the pumping-side elastomer ring 26 or on both elastomer rings.
  • the elastomer ring 26 on the pumping station side has a sealing lip 27, which means that the elastic means 24 to improve the smooth running of the air pump 10 according to the invention also serve as sealing elements between the motor part 15 and the pumping unit 13 of the air pump according to the invention.
  • the elastomer ring 26 on the pumping station side is advantageously arranged in the region of a bearing plate 32 of the drive motor facing the pumping station 13.
  • a retaining cover 34 is installed on the side of the motor housing 17 facing away from the pump unit 13.
  • the holding cover 34 is pressed onto 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.
  • Air pump according to the embodiment of Figure 1 is carried out in two stages. Between the two
  • Impellers 36 and 38 of the pump unit are arranged with a stator 40 which is firmly connectable to the housing 12 of the air pump.
  • the stator 40 has structures in the form of channels 42, which ensure that the air conveyed radially outward by the first impeller 36 is conveyed from the outer region of the first impeller into the inner impeller region of the second impeller 38, so that an effective two-stage compression the sucked in air can take place.
  • the compressed air guided radially outwards by the second impeller 38 is conveyed into an annular air guiding channel 18, which runs in the circumferential direction of the housing 12 of the air pump 10, the diameter of which in the circumferential direction of the pump housing 12 increases.
  • This air duct 18 (volute) opens into a pressure-side connection of the air pump, which is not shown in FIG. 1.
  • the air pump 10 according to the invention is not limited to a two-stage pump unit 13. Further or even fewer 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 from the upstream impeller into the radially inner region of the downstream impeller.
  • the pumping station cover 20 is designed such that on its inside, i.e. structures 47 are formed on the side facing the first impeller 36 of the pump unit 13, which prevent the air compressed via the first impeller from flowing back into the suction region of the pump unit.
  • the housing of the air pump is closed on the pump plant side by a cover 20 which has a central opening 44 for the suction of the air to be compressed.
  • the central opening 44 in the cover 20 of the pump housing 12 is designed as a connector 46, which makes it possible to quickly and easily install corresponding connecting means, such as hoses, on the pump according to the invention.
  • the pump housing 12, the stator 40 of the pumping unit 13 and the pumping unit-side cover 20 are connected to one another towards the end of the method according to the invention for producing an electrically driven air pump.
  • a balancing disk 50 is installed on the drive shaft 23 of the motor 16, which is non-rotatably connected to the drive shaft.
  • This balancing disk 50 can be made of metal, for example from a sheet metal, and has a diameter that is typically smaller than the diameter of the rotor 19 of the drive motor 16.
  • the balancing disk 50 is made by a person skilled in the art Fastening method rotatably connected to the drive shaft 23. Balancing marks can be set on the balancing disk 50, for example by material removal, to compensate for the unbalance of the air pump 10 according to the invention.
  • the end of the housing 12 of the air pump 10 according to the invention facing away from the pump unit 13 is closed by a cover 22 after the air pump has been installed.
  • the mounted 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 process is carried out, for example, by material removal or application to the motor shaft or to the rotor or also to the armature of the motor.
  • a pre-balancing of the electric motor 16 can be dispensed with, so that only the balancing of the air pump 10 with the mounted electric motor 16 and the mounted pump wheel 36 or 38 needs to be carried out.
  • the preassembled electric motor 16 is inserted into the pump housing 12 through an opening 52 of the pump housing 12 facing away from the pump unit 13 and is secured in the axial and radial direction by latching the holding cover 34 on the housing.
  • the latching of the holding cover 34 is to be selected such that the elastomer rings 26 and 28 are pressed against the inside of the pump housing 12 under a certain pretension. Then the impeller 38, the stator
  • FIG. 2 shows the pump according to the invention with built-in electric motor 16 and mounted pump unit 13, as used for balancing, for example, in a balancing machine.
  • the balancing process is carried out in succession or in parallel in two balancing planes A and B arranged essentially perpendicular to the drive shaft 23 of the air pump 10.
  • the balancing plane A is formed by the balancing plate 50 at the end of the drive shaft 23 facing away from the pump unit 13.
  • the second balancing plane B is formed by the cover plate 54 of the impeller 36 of the pump unit 13 of the invention Air pump 10 formed.
  • the balancing plane B can also coincide with the base plate 56 of the impeller 36.
  • the air pump 10 according to the invention is advantageously balanced by setting balancing marks in one or both balancing planes.
  • material can be "nibbled" off the balancing disk 50 or the cover disk 54.
  • the balancing speed and the type of balancing 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 is prohibited in the speed range of the natural frequency of the decoupling means 24.
  • Material removal by evaporation using a high-intensity light or laser beam is another possible method for setting balancing marks in the method according to the invention. Furthermore, it is also possible to use balancing marks by applying adhesive points, in particular to a fan wheel or the like
  • the pump housing 12 is completed by mounting the covers 22 and 20 on the drive motor side and on the pump unit side, respectively.
  • the stator 40 is fixed axially and radially between the housing part 14 and the cover 20, so that it is secured against rotation.
  • the stator 40 can be fitted on its outer circumference 58 into corresponding recesses 60 of the central housing part 14 of the pump housing 12 or into recesses 62 of the cover 20 on the pumping unit side and can be clamped in by mounting the cover 20.
  • a multitude of options are available to the person skilled in the art for fastening the covers 20 and 22 that complete the pump housing 12. Excerpts, and by no means conclusive, clamping, screwing, riveting, gluing, ultrasonic welding or friction welding should be mentioned as possible fastening methods.
  • the air pump according to the invention is not limited to the exemplary embodiments shown in the figures.
  • the air pump according to the invention is not limited to the use of a two-stage pumping station.
  • the method according to the invention for producing an electrically driven air pump is not limited to the mechanical mass removal on the fan wheel or the balancing disk.
  • balancing masses there is also a

Landscapes

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

Abstract

L'invention concerne un procédé de production d'une pompe à air à commande électrique (10), notamment d'une pompe à air secondaire (10) destinée à un véhicule automobile pourvu d'un moteur à combustion. Cette pompe à air (10) a un carter (12) qui abrite une unité de pompage (13) dotée au moins d'une roue de ventilateur (36, 38) et un moteur électrique (16) qui entraîne la ou les roue(s) de ventilateur (36, 28). Selon l'invention, la pompe à air (10) et le moteur électrique (16) intégré dans le carter (12) sont équilibrés par des masses d'équilibrage dans au moins deux plans (A, B) axialement distants. L'invention concerne également une pompe à air à commande électrique (10), notamment une pompe à air secondaire (10) destinée à un véhicule automobile pourvu d'un moteur à combustion et comprenant un carter (12) et un moteur électrique (16) intégré au carter (12) et soutenu par des moyens élastiques (24) dans le carter (12), et une unité de pompage (13) pourvue d'au moins une roue de ventilateur (36, 38) fixée à un arbre (23) du moteur de commande (16) de telle façon qu'un disque d'équilibrage (50) se situe dans la zone de l'extrémité de l'arbre menant (23) du moteur électrique (16), extrémité qui est opposée à l'unité de pompage (13).
EP03788774A 2002-12-18 2003-11-07 Pompe a air a commande electrique et son procede de production Expired - Lifetime EP1576293B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10259179A DE10259179A1 (de) 2002-12-18 2002-12-18 Elektrisch angetriebene Luftpumpe und Verfahren zur Herstellung einer elektrisch angetriebenen Luftpumpe
DE10259179 2002-12-18
PCT/DE2003/003678 WO2004057195A1 (fr) 2002-12-18 2003-11-07 Pompe a air a commande electrique et son procede de production

Publications (2)

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

Family

ID=32477746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03788774A Expired - Lifetime EP1576293B1 (fr) 2002-12-18 2003-11-07 Pompe a air a commande electrique et son procede de production

Country Status (5)

Country Link
US (1) US7520734B2 (fr)
EP (1) EP1576293B1 (fr)
JP (1) JP2006510839A (fr)
DE (1) DE10259179A1 (fr)
WO (1) WO2004057195A1 (fr)

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DE102008021682A1 (de) * 2008-04-30 2009-11-05 Magna Powertrain Ag & Co Kg Verfahren zur Montage einer Baueinheit
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US8267072B2 (en) * 2010-11-02 2012-09-18 Ford Global Technologies, Llc Efficient vacuum for a vehicle
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DE102013109401A1 (de) * 2013-08-02 2015-02-19 Ebm-Papst Landshut Gmbh Radialgebläse in kompakter Bauweise
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EP3695696A1 (fr) 2019-02-12 2020-08-19 Instant Seed GmbH Pastilles de matériau d'ensemencement
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JP7396909B2 (ja) * 2020-01-24 2023-12-12 ミネベアミツミ株式会社 回転機器
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Also Published As

Publication number Publication date
US20060115368A1 (en) 2006-06-01
US7520734B2 (en) 2009-04-21
DE10259179A1 (de) 2004-07-08
JP2006510839A (ja) 2006-03-30
WO2004057195A1 (fr) 2004-07-08
EP1576293B1 (fr) 2012-08-22

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