WO2000007281A1 - Unite d'entrainement electrique - Google Patents

Unite d'entrainement electrique 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)
English (en)
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/fr

Links

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

Des unités d'entraînement électriques connues, notamment pour les essuie-glace d'un véhicule, possèdent des systèmes permettant le réglage du jeu longitudinal de l'induit. Ce réglage est toutefois très complexe. Selon l'invention, un induit (5) de l'unité d'entraînement (1) est logé dans le carter d'engrenages (12) au moyen d'un premier roulement (18) se présentant sous la forme d'un roulement à billes, et est relié avec un arbre (15) de l'induit (5) par ajustage serré. Le serrage axial du roulement à billes (18) permet la transmission intégrale des forces axiales engendrées lors du fonctionnement de l'unité d'entraînement électrique (1), de sorte qu'il est possible de renoncer totalement aux systèmes utilisés jusqu'à présent pour le réglage du jeu longitudinal de l'induit. L'unité d'entraînement électrique décrite est destinée notamment aux essuie-glace d'un véhicule automobile.
PCT/DE1999/002036 1998-07-30 1999-07-02 Unite d'entrainement electrique WO2000007281A1 (fr)

Applications Claiming Priority (2)

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

Publications (1)

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

Family

ID=7875818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/002036 WO2000007281A1 (fr) 1998-07-30 1999-07-02 Unite d'entrainement electrique

Country Status (1)

Country Link
WO (1) WO2000007281A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930144C2 (fr) 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 (de) 1995-03-09 1996-09-12 Bosch Gmbh Robert Antriebsaggregat mit einem elektrischen Antriebsmotorr und einem diesem nachgeordneten Schneckengetriebe
FR2748436A1 (fr) * 1996-05-07 1997-11-14 Valeo Systemes Dessuyage Motoreducteur pour essuie-glace sans butee de blocage d'arbre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930144C2 (fr) 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 (de) 1995-03-09 1996-09-12 Bosch Gmbh Robert Antriebsaggregat mit einem elektrischen Antriebsmotorr und einem diesem nachgeordneten Schneckengetriebe
FR2748436A1 (fr) * 1996-05-07 1997-11-14 Valeo Systemes Dessuyage Motoreducteur pour essuie-glace sans butee de blocage d'arbre

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