WO2000007281A1 - Electric drive unit - Google Patents

Electric drive unit Download PDF

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Publication number
WO2000007281A1
WO2000007281A1 PCT/DE1999/002036 DE9902036W WO0007281A1 WO 2000007281 A1 WO2000007281 A1 WO 2000007281A1 DE 9902036 W DE9902036 W DE 9902036W WO 0007281 A1 WO0007281 A1 WO 0007281A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
armature
drive unit
electric drive
armature shaft
Prior art date
Application number
PCT/DE1999/002036
Other languages
German (de)
French (fr)
Inventor
Detlef Lauk
Lothar Fauth
Ernst Fischer
Hansjörg Karcher
Jürgen Herp
Erik Maurer
Andreas Wiegert
Richard Hurst
Anton Waibel
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 WO2000007281A1 publication Critical patent/WO2000007281A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/081—Structural association with bearings specially adapted for worm gear drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
    • F16C2380/27—Motor coupled with a gear, e.g. worm gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
    • F16H2057/0213—Support of worm gear shafts

Definitions

  • the invention relates to an electric drive unit, in particular for a windshield wiper of a motor vehicle, as z. B. is known from DE 39 30 144 C2.
  • the armature is accommodated in an essentially pot-shaped pole housing.
  • a gear housing which is provided for receiving gear elements and for mounting the armature by means of a ball bearing, connects to the front of the pole housing.
  • the armature is mounted in the pole housing in a known manner by means of a
  • Spherical bearing which consists of a sintered metal and which is usually fixed in a recess in the pole housing base by a spring washer adapted to the bearing.
  • the rotatability of the spherical bearing is intended to compensate for slight misalignments of the anchor.
  • the armature shaft of the windshield wiper motor must have no play in the axial direction, since otherwise the entire drive device is subject to considerable wear and tear and knocking noises occur in the turning positions of the windshield in particular.
  • the longitudinal armature play is set by means of a screw. Another possibility to compensate for the longitudinal armature game is disclosed in DE 195 08 306 AI, in which the longitudinal armature game is eliminated by a prestressed leaf spring-like spring element.
  • the electric drive unit according to the invention with the characterizing features of claim 1 has the advantage that previously required devices for longitudinal armature adjustment can be completely dispensed with, so that the manufacturing costs and in particular the assembly costs can be considerably reduced.
  • fewer parts are required in order to be able to manufacture the electric drive unit according to the invention without axial play, so that the manufacturing costs are reduced accordingly.
  • Critical adjustment processes for the longitudinal play of the armature are eliminated.
  • the electric drive unit 1 shown in the drawing is intended in particular for windshield wipers of a motor vehicle and comprises an essentially pot-shaped pole housing 3, in which an armature 5 or rotor constructed in a conventional manner is accommodated.
  • the armature 5 has a collector or commutator 6 in order to be electrically contacted by means of brushes, not shown.
  • permanent magnets 8 are accommodated in a known manner, which in conjunction with current-carrying coils of the armature 5 cause the armature 5 to rotate.
  • a z. B On the end face of a flange 10 of the pole housing 3 is a z. B. also essentially pot-shaped gear housing 12 is attached, which serves to receive a gear wheel, not shown, which engages in a worm 16 connected to an armature shaft 15 of the armature 5.
  • the armature shaft 15 is mounted in the gear housing 12 in a first bearing 18, which is preferably designed as a ball bearing.
  • the ball bearing 18 is axially secured in the gear housing 12 by means of a retaining bracket 20, the retaining bracket 20 acting on the outer ring of the ball bearing 18.
  • the armature shaft 15 in its side facing away from the gear housing 12 is formed in a pole housing 3
  • Indentation 22 is mounted by means of a second bearing 19 which is mounted in the indentation 22 by an interference fit and is designed as a plain bearing.
  • the outer diameter D j ⁇ of the second bearing 19 is greater than or equal to three times its axial length L.
  • Outer diameter D ⁇ of the pressed-in second bearing 19 in particular also enables a sufficient pore volume for the lubricant and thus provides good lubrication of the second, e.g. B. from a sintered bearing 19 formed over a long period of time. Due to the small length L of the second bearing 19, slight misalignments of the armature shaft 15 do not have a disadvantageous effect on the running of the drive unit 1, since due to the relatively short length L of the second bearing 19 there is practically no tensioning of the armature shaft 15 in the second bearing 19 can.
  • the first bearing 18, which is preferably designed as a ball bearing, is attached to the armature shaft 15 by means of a press fit.
  • the ball bearing 18 is mounted with such a high pressure that it is possible to transmit the complete axial force of the armature shaft 15 occurring during operation of the electric drive unit 1 to the housing 12, with almost no axial play in the ball bearing 18.
  • the ball bearing 18 is a bearing which is designed with a so-called narrow osculation.
  • Such bearings have a relatively high axial play before being pressed onto the armature shaft 15, and after the pressing process onto the armature shaft 15 there is a deformation of the inner raceway ring 24, which leads to an extreme reduction in the axial play and the radial play of the bearing 18.
  • the bearing 18 When the bearing 18 is pressed on, it has an axial play of only about 30 to 60 ⁇ m and a radial play of about 3 to 6 ⁇ m.
  • the pressure of the inner race ring 24 of the bearing 18 on the Armature shaft 15 is approximately 1800 to 3800 N, so that the axial force occurring during operation is transferred via the press fit to the inner race ring 24 of the bearing 18 to the armature shaft 15 and vice versa. Via the retaining bracket 20 provided on the bearing 18, this axial force is then introduced into the gear housing 12 via an outer ring 25 of the bearing 18.
  • the armature shaft 15 is preferably an unhardened shaft.
  • the ball bearing 18 is attached during the manufacture of the armature shaft 15 before the formation of the worm 16.
  • the electric drive unit 1 is mounted in such a way that the armature shaft 15 equipped with the pressed-on ball bearing 18 is inserted into the pole housing 3 and into the second bearing 19 becomes. Then the gear housing 12 can be mounted on the pole housing 3.
  • the ball bearing 18 is fastened in the gear housing 12 by means of the holding bracket 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Preart electric drive units, especially for windshield wipers of a motor vehicle, comprise devices for adjusting the longitudinal play of the armature. However, adjusting the longitudinal play of the armature requires a great amount of effort. According to the invention, an armature (5) of the drive unit (1) is mounted in the gearbox housing (12) by means of a first bearing (18). Said bearing is produced as a ball bearing and is connected to an armature shaft (15) of the armature (5) by interference fit. The axial compression of the ball bearing (18) enables the complete transmission of the axial forces which are generated during the operation of the electric drive unit (1) so that known, common devices provided for adjusting longitudinal play of the armature can be completely dispensed with. The inventive electric drive unit is especially provided for windshield wipers of a motor vehicle.

Description

Elektrische AntriebseinheitElectric drive unit
Stand der TechnikState of the art
Die Erfindung geht aus von einer elektrischen Antriebseinheit, insbesondere für einen Scheibenwischer eines Kraftfahrzeugs, wie sie z. B. aus der DE 39 30 144 C2 bekannt ist. Bei diesen bekannten Antriebseinheiten ist der Anker in einem im wesentlichen topfförmigen Polgehäuse untergebracht. An dem Polgehäuse schließt sich stirnseitig ein Getriebegehäuse an, das zur Aufnahme von Getriebeelementen und zur Lagerung des Ankers mittels eines Kugellagers vorgesehen ist. Die Lagerung des Ankers im Polgehäuse erfolgt in bekannter Weise mittels einesThe invention relates to an electric drive unit, in particular for a windshield wiper of a motor vehicle, as z. B. is known from DE 39 30 144 C2. In these known drive units, the armature is accommodated in an essentially pot-shaped pole housing. A gear housing, which is provided for receiving gear elements and for mounting the armature by means of a ball bearing, connects to the front of the pole housing. The armature is mounted in the pole housing in a known manner by means of a
Kalottenlagers, das aus einem Sintermetall besteht und das durch eine an das Lager angepaßte Federscheibe in einer Vertiefung im Polgehäuseboden üblicherweise fixiert wird. Durch die Verdrehmöglichkeit des Kalottenlagers sollen geringfügige Schiefstellungen des Ankers ausgeglichen werden. Bei derartigen Antriebseinrichtungen darf die Ankerwelle des Scheibenwischmotors in axialer Richtung kein Spiel aufweisen, da ansonsten die gesamte Antriebseinrichtung einem erheblichen Verschleiß unterliegt und insbesondere als störend empfundene Klopfgeräusche in den Wendelagen der Scheibe entstehen. Bei der aus dem Stand der Technik bekannten Antriebseinheit wird das Ankerlängsspiel über eine Schraube eingestellt. Eine weitere Möglichkeit, das Ankerlängsspiel auszugleichen, wird in der DE 195 08 306 AI offenbart, bei der das Ankerlängsspiel durch ein vorgespanntes blattfederartiges Federelement eliminiert wird.Spherical bearing, which consists of a sintered metal and which is usually fixed in a recess in the pole housing base by a spring washer adapted to the bearing. The rotatability of the spherical bearing is intended to compensate for slight misalignments of the anchor. In such drive devices, the armature shaft of the windshield wiper motor must have no play in the axial direction, since otherwise the entire drive device is subject to considerable wear and tear and knocking noises occur in the turning positions of the windshield in particular. In the drive unit known from the prior art, the longitudinal armature play is set by means of a screw. Another possibility to compensate for the longitudinal armature game is disclosed in DE 195 08 306 AI, in which the longitudinal armature game is eliminated by a prestressed leaf spring-like spring element.
Problematisch bei all diesen Einrichtungen zur Ankerlängsspieleinstellung ist jedoch ein hoher Aufwand, insbesondere bei einer Massenherstellung der Antriebseinheit. Außerdem ist in der Produktion ein Einstellvorgang für das Ankerlängsspiel erforderlich, der als Prozeß kritisch zu bewerten ist.However, the problem with all these devices for adjusting the longitudinal play of the armature is a high outlay, in particular in the case of mass production of the drive unit. In addition, an adjustment process for the longitudinal play of the armature is required in production, which must be critically assessed as a process.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße elektrische Antriebseinheit mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß bisher erforderliche Einrichtungen zur Ankerlängsspieleinstellung vollständig entfallen können, so daß sich die Herstellungskosten und insbesondere die Montagekosten erheblich reduzieren lassen. Vorteilhafterweise sind weniger Teile erforderlich, um die erfindungsgemäße elektrische Antriebseinheit ohne Axialspiel herstellen zu können, so daß sich die Herstellungskosten entsprechend reduzieren. Kritische Einstellvorgänge für das Ankerlängsspiel entfallen.The electric drive unit according to the invention with the characterizing features of claim 1 has the advantage that previously required devices for longitudinal armature adjustment can be completely dispensed with, so that the manufacturing costs and in particular the assembly costs can be considerably reduced. Advantageously, fewer parts are required in order to be able to manufacture the electric drive unit according to the invention without axial play, so that the manufacturing costs are reduced accordingly. Critical adjustment processes for the longitudinal play of the armature are eliminated.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen elektrischen Antriebseinheit möglich.The measures listed in the subclaims allow advantageous developments and improvements of the electric drive unit specified in claim 1.
Besonders vorteilhaft ist die Verwendung eines durchThe use of a through is particularly advantageous
Preßpassung montierten zweiten Lagers im Polgehäuse, dessen Außendurchmesser größer oder gleich dem Dreifachen seiner Länge ist, so daß bisher übliche Kalottenlager, die eine Vielzahl zusätzlicher Sicherungselemente enthalten, entfallen können. ZeichnungPress fit mounted second bearing in the pole housing, the outer diameter of which is greater than or equal to three times its length, so that previously customary spherical bearings which contain a large number of additional securing elements can be dispensed with. drawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der Beschreibung näher erläutert .An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the description.
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die in der Zeichnung dargestellte elektrische Antriebseinheit 1 ist insbesondere für Scheibenwischer eines Kraftfahrzeugs vorgesehen und umfaßt ein im wesentlichen topfförmiges Polgehäuse 3, in dem ein in üblicher Weise aufgebauter Anker 5 oder Rotor untergebracht ist . Der Anker 5 besitzt einen Kollektor oder Kommutator 6, um mittels nicht näher dargestellter Bürsten elektrisch kontaktiert zu werden. In dem topfförmigen Polgehäuse 3 sind in bekannter Weise Permanentmagnete 8 untergebracht, die in Verbindung mit stromdurchflossenen Spulen des Ankers 5 eine Drehung desselben bewirken.The electric drive unit 1 shown in the drawing is intended in particular for windshield wipers of a motor vehicle and comprises an essentially pot-shaped pole housing 3, in which an armature 5 or rotor constructed in a conventional manner is accommodated. The armature 5 has a collector or commutator 6 in order to be electrically contacted by means of brushes, not shown. In the pot-shaped pole housing 3, permanent magnets 8 are accommodated in a known manner, which in conjunction with current-carrying coils of the armature 5 cause the armature 5 to rotate.
Stirnseitig ist an einem Flansch 10 des Polgehäuses 3 ein z. B. im wesentlichen ebenfalls topfförmig ausgebildetes Getriebegehäuse 12 befestigt, das zur Aufnahme eines nicht näher dargestellten Getriebezahnrades, welches in eine mit einer Ankerwelle 15 des Ankers 5 verbundene Schnecke 16 eingreift, dient. Die Ankerwelle 15 ist in dem Getriebegehäuse 12 in einem ersten Lager 18 gelagert, welches vorzugsweise als Kugellager ausgebildet ist. Das Kugellager 18 wird mittels eines Haltebügels 20 in dem Getriebegehäuse 12 axial gesichert, wobei der Haltebügel 20 auf den Außenring des Kugellagers 18 wirkt. Des weiteren ist die Ankerwelle 15 in ihrer auf dem Getriebegehäuse 12 abgewandten Seite in einer in dem Polgehäuse 3 ausgebildeten Vertiefung 22 mittels eines durch Preßpassung in der Vertiefung 22 montierten zweiten Lagers 19 gelagert, das als Gleitlager ausgebildet ist. Der Außendurchmesser Dj^ des zweiten Lagers 19 ist dabei größer oder gleich dem Dreifachen seiner axialen Länge L. Der relativ großeOn the end face of a flange 10 of the pole housing 3 is a z. B. also essentially pot-shaped gear housing 12 is attached, which serves to receive a gear wheel, not shown, which engages in a worm 16 connected to an armature shaft 15 of the armature 5. The armature shaft 15 is mounted in the gear housing 12 in a first bearing 18, which is preferably designed as a ball bearing. The ball bearing 18 is axially secured in the gear housing 12 by means of a retaining bracket 20, the retaining bracket 20 acting on the outer ring of the ball bearing 18. Furthermore, the armature shaft 15 in its side facing away from the gear housing 12 is formed in a pole housing 3 Indentation 22 is mounted by means of a second bearing 19 which is mounted in the indentation 22 by an interference fit and is designed as a plain bearing. The outer diameter D j ^ of the second bearing 19 is greater than or equal to three times its axial length L. The relatively large
Außendurchmesser D^ des eingepreßten zweiten Lagers 19 ermöglicht insbesondere auch ein ausreichendes Porenvolumen für den Schmierstoff und stellt so eine gute Schmierung des zweiten, z. B. aus einem Sinterwerkstoff ausgebildeten Lagers 19 über einen langen Zeitraum sicher. Aufgrund der kleinen Länge L des zweiten Lagers 19 wirken sich geringfügige Schiefstellungen der Ankerwelle 15 nicht nachteilig auf den Lauf der Antriebseinheit 1 aus, da es aufgrund der relativ geringen Länge L des zweiten Lagers 19 praktisch nicht zu Verspannungen der Ankerwelle 15 im zweiten Lager 19 kommen kann.Outer diameter D ^ of the pressed-in second bearing 19 in particular also enables a sufficient pore volume for the lubricant and thus provides good lubrication of the second, e.g. B. from a sintered bearing 19 formed over a long period of time. Due to the small length L of the second bearing 19, slight misalignments of the armature shaft 15 do not have a disadvantageous effect on the running of the drive unit 1, since due to the relatively short length L of the second bearing 19 there is practically no tensioning of the armature shaft 15 in the second bearing 19 can.
Erfindungsgemäß ist das erste Lager 18, das vorzugsweise als Kugellager ausgebildet ist, mittels Preßpassung auf der Ankerwelle 15 befestigt. Das Kugellager 18 wird dabei mit einer so hohen Pressung montiert, daß es möglich ist, die beim Betrieb der elektrischen Antriebseinheit 1 auftretende komplette Axialkraft der Ankerwelle 15 auf das Gehäuse 12 zu übertragen, wobei nahezu kein Axialspiel im Kugellager 18 vorliegt. Bei dem Kugellager 18 handelt es sich um ein Lager, das mit einer sogenannten eingeengten Schmiegung ausgebildet ist. Derartige Lager weisen vor dem Aufpressen auf die Ankerwelle 15 ein relativ hohes Axialspiel auf, wobei es nach dem Aufpreßvorgang auf die Ankerwelle 15 zu einer Verformung des inneren Laufbahnringes 24 kommt, die zu einer extremen Reduzierung des Axialspiels und des Radialspiels des Lagers 18 führt. Im aufgepreßten Zustand des Lagers 18 weist es ein Axialspiel von nur etwa 30 bis 60 μm und ein Radialspiel von etwa 3 bis 6 μ auf. Die Pressung des inneren Laufbahnringes 24 des Lagers 18 auf die Ankerwelle 15 beträgt etwa 1800 bis 3800 N, so daß eine Übertragung der beim Betrieb auftretenden Axialkraft über die Preßpassung auf den inneren Laufbahnring 24 des Lagers 18 zur Ankerwelle 15 und umgekehrt erfolgt. Über den am Lager 18 vorgesehenen Haltebügel 20 wird diese Axialkraft dann über einen Außenring 25 des Lagers 18 in das Getriebegehäuse 12 eingeleitet. Durch das erfindungsgemäße Aufpressen des Kugellagers 18, das über eine eingeengte Schmiegung verfügt, ist es somit möglich, auf weitere Elemente zur Axialspieleinstellung der Ankerwelle 15 zu verzichten. Bei der Ankerwelle 15 handelt es sich vorzugsweise um eine ungehärtete Welle. Das Aufbringen des Kugellagers 18 erfolgt beim Herstellen der Ankerwelle 15 vor der Ausbildung der Schnecke 16. Die Montage der elektrischen Antriebseinheit 1 erfolgt in der Weise, daß die mit dem aufgepreßten Kugellager 18 ausgestattete Ankerwelle 15 in das Polgehäuse 3 und in das zweite Lager 19 eingesteckt wird. Anschließend kann die Montage des Getriebegehäuses 12 am Polgehäuse 3 durchgeführt werden. Die Befestigung des Kugellagers 18 in dem Getriebegehäuse 12 erfolgt dabei mittels dem Haltebügel 20. According to the invention, the first bearing 18, which is preferably designed as a ball bearing, is attached to the armature shaft 15 by means of a press fit. The ball bearing 18 is mounted with such a high pressure that it is possible to transmit the complete axial force of the armature shaft 15 occurring during operation of the electric drive unit 1 to the housing 12, with almost no axial play in the ball bearing 18. The ball bearing 18 is a bearing which is designed with a so-called narrow osculation. Such bearings have a relatively high axial play before being pressed onto the armature shaft 15, and after the pressing process onto the armature shaft 15 there is a deformation of the inner raceway ring 24, which leads to an extreme reduction in the axial play and the radial play of the bearing 18. When the bearing 18 is pressed on, it has an axial play of only about 30 to 60 μm and a radial play of about 3 to 6 μm. The pressure of the inner race ring 24 of the bearing 18 on the Armature shaft 15 is approximately 1800 to 3800 N, so that the axial force occurring during operation is transferred via the press fit to the inner race ring 24 of the bearing 18 to the armature shaft 15 and vice versa. Via the retaining bracket 20 provided on the bearing 18, this axial force is then introduced into the gear housing 12 via an outer ring 25 of the bearing 18. By pressing on the ball bearing 18 according to the invention, which has a narrow osculation, it is thus possible to dispense with further elements for adjusting the axial play of the armature shaft 15. The armature shaft 15 is preferably an unhardened shaft. The ball bearing 18 is attached during the manufacture of the armature shaft 15 before the formation of the worm 16. The electric drive unit 1 is mounted in such a way that the armature shaft 15 equipped with the pressed-on ball bearing 18 is inserted into the pole housing 3 and into the second bearing 19 becomes. Then the gear housing 12 can be mounted on the pole housing 3. The ball bearing 18 is fastened in the gear housing 12 by means of the holding bracket 20.

Claims

Ansprüche Expectations
1. Elektrische Antriebseinheit, insbesondere für1. Electric drive unit, especially for
Scheibenwischer eines Kraftfahrzeugs, mit einem Anker mit Ankerwelle, der in einem im wesentlichen topfförmigen Polgehäuse untergebracht ist, an das sich stirnseitig ein Getriebegehäuse zur Aufnahme von Getriebeelementen anschließt, wobei der Anker einerseits in dem Polgehäuse und andererseits in dem Getriebegehäuse mittels eines ersten und eines zweiten Lagers gelagert ist, dadurch gekennzeichnet, daß das erste Lager (18) mittels Preßpassung an der Ankerwelle (15) befestigt ist.Windshield wiper of a motor vehicle, with an armature with an armature shaft, which is accommodated in an essentially pot-shaped pole housing, to which a gear housing for receiving gear elements is connected at the end, the armature in the pole housing on the one hand and in the gear housing on the other by means of a first and a second Bearing is mounted, characterized in that the first bearing (18) is press-fitted to the armature shaft (15).
2. Elektrische Antriebseinheit nach Anspruch 1, dadurch gekennzeichnet, daß das erste Lager (18) ein Kugellager ist.2. Electric drive unit according to claim 1, characterized in that the first bearing (18) is a ball bearing.
3. Elektrische Antriebseinheit nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das erste Lager (18) vor dem3. Electric drive unit according to claim 1 or 2, characterized in that the first bearing (18) before
Aufpressen auf die Ankerwelle (15) ein relativ hohes Axialspiel aufweist, das sich nach dem Aufpressen auf die Ankerwelle (15) stark reduziert.Pressing on the armature shaft (15) has a relatively high axial play, which is greatly reduced after pressing on the armature shaft (15).
4. Elektrische Antriebseinheit nach Anspruch 3, dadurch gekennzeichnet, daß im aufgepreßten Zustand des ersten Lagers (18) auf der Ankerwelle (15) das Axialspiel des ersten Lagers (18) etwa 30 bis 60 μm und das Radialspiel etwa 3 bis 6 μm beträg . 4. Electrical drive unit according to claim 3, characterized in that in the pressed-on state of the first bearing (18) on the armature shaft (15), the axial play of the first bearing (18) is approximately 30 to 60 μm and the radial play is approximately 3 to 6 μm.
5. Elektrische Antriebseinheit nach Anspruch 2, dadurch gekennzeichnet, daß die erforderliche Preßkraft zum Aufpressen des ersten Lagers (18) im Bereich von etwa 1800 N bis etwa 3800 N liegt. 5. Electric drive unit according to claim 2, characterized in that the required pressing force for pressing on the first bearing (18) is in the range from about 1800 N to about 3800 N.
PCT/DE1999/002036 1998-07-30 1999-07-02 Electric drive unit WO2000007281A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19834320.5 1998-07-30
DE19834320 1998-07-30

Publications (1)

Publication Number Publication Date
WO2000007281A1 true WO2000007281A1 (en) 2000-02-10

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PCT/DE1999/002036 WO2000007281A1 (en) 1998-07-30 1999-07-02 Electric drive unit

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930144C2 (en) 1989-09-09 1993-04-29 Swf Auto-Electric Gmbh, 7120 Bietigheim-Bissingen, De
US5454438A (en) * 1994-03-31 1995-10-03 Nsk Ltd. Electric power steering system
DE19508306A1 (en) 1995-03-09 1996-09-12 Bosch Gmbh Robert Drive unit with an electric drive motor and a worm gear arranged downstream of it
FR2748436A1 (en) * 1996-05-07 1997-11-14 Valeo Systemes Dessuyage Electric motor and gearing assembly for motor vehicle windscreen wipers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930144C2 (en) 1989-09-09 1993-04-29 Swf Auto-Electric Gmbh, 7120 Bietigheim-Bissingen, De
US5454438A (en) * 1994-03-31 1995-10-03 Nsk Ltd. Electric power steering system
DE19508306A1 (en) 1995-03-09 1996-09-12 Bosch Gmbh Robert Drive unit with an electric drive motor and a worm gear arranged downstream of it
FR2748436A1 (en) * 1996-05-07 1997-11-14 Valeo Systemes Dessuyage Electric motor and gearing assembly for motor vehicle windscreen wipers

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