Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
  • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
  • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
• • 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

Definitions

• the invention is based on an electric motor according to the preamble of claim 1.
• a generic electric motor in which an armature shaft on which an armature packet is firmly seated, on the one hand by means of a ball bearing in a pole housing and on the other hand rotatably mounted by means of a further ball bearing in a transmission housing.
• a worm On the free end of the armature shaft, a worm is cut, which meshes with a worm wheel.
• the worm gear generates axial forces in the longitudinal direction of the armature shaft, which are transmitted via the ball bearings to the pole housing or the gear housing, in each case by supporting the outer bearing ring of the corresponding ball bearing with an end face on a shoulder of the pole housing or gear housing.
• the outer bearing rings of the ball bearings are supported by spring elements with respect to the housings.
• a spring element is provided which pushes the armature shaft with the armature stack against the gear-side ball bearing whose outer bearing ring is supported directly in the gear housing. While the outer bearing rings of the ball bearings with sliding fit are inserted in the housings, the inner bearing rings sit on the armature shaft and are supported axially towards the anchor packet via a collar.
• an electric motor in particular for windshield wipers, in which the armature shaft is rotatably mounted on each side of the armature packet rotatably in a housing of the electric motor or in a gear housing for the worm.
• One of the two armature shaft bearings preferably the transmission housing side bearing, is a ball bearing, the inner ring is pressed onto the axial fixing of the armature shaft to this.
• the outer ring of the armature shaft bearing is inserted in a bearing seat in the housing and secured axially by means of a spring ring inserted into a groove in the housing.
• a single spring element is provided on the gearbox-side ball bearing, while the outer bearing ring of the pole-housing-side ball bearing is supported directly on a shoulder of the pole housing.
• the inventive design results in simple means a backlash-free and thus quiet storage of Ankerwel- Ie with a good efficiency.
• the armature shaft is easy to manufacture and assemble, regardless of whether the inner race of the ball bearing mounted on the armature shaft as a separate component or is an integral part of the armature shaft. In this case, tight tolerances of the armature shaft can be used for the press fits of the inner bearing rings, while allowing the sliding seats on the outer bearing rings coarser tolerances.
• the inner bearing rings are pressed onto the armature shaft. They can also be secured axially on the side of the anchor package by a support.
• the axial support can be formed by a recessed into a groove spring ring or a rolled collar or sleeve, which is supported on the anchor package.
• the thus configured axial supports are preferably applied to the pole housing side ball bearing, but they can also be optionally used in the gearbox housing side ball bearing.
• Fig. 4 shows a variant in the region of the polgetude scheme.
• the electric motor 10 shown in the figures is shown only schematically, to the extent necessary to understand the invention.
• the electric motor 10 has an armature packet 12 which is mounted on an armature shaft 14. This is rotatably mounted on both sides of the anchor assembly 12 by means of ball bearings 24 and 40 in a transmission housing 20 and in a pole housing 22.
• a worm 16 is arranged, which may be integrally formed on the armature shaft 14 in the usual way or is fixedly connected to the armature shaft 14 as a separate component.
• the worm 16 generates forces in the longitudinal direction 18. These axial forces are transmitted via the ball bearings 24 and 40 to the transmission housing 20 and to the pole housing 22.
• the ball bearings 24, 40 have an inner bearing ring 28, 44, which is pressed onto the armature shaft 14, and in the embodiment of FIG. 1 to the armature core 12 through addition axially secured by axial supports in the form of spring washers 32, 48.
• the axial forces in the longitudinal direction 18 are transmitted via bearing balls 26, 42 transmitted to outer bearing rings 30, 46, which are used with sliding seats in bearing seats 34, 50 of the gear housing 20 and the pole housing 22.
• the outer bearing ring 30 of the gear housing-side ball bearing 24 is supported axially via a spring element 36 in the form of a plate spring on a shoulder 38 of the gear housing 20, while the outer bearing ring 46 of the pole housing side bearing 40 is supported on the front side directly on a shoulder 52 of the pole housing 22.
• the spring element 36 is designed so that it holds the ball bearings 24, 40 in a play-free state under all operating conditions, so that even with a change of direction of the electric motor 10 no system change takes place in the ball bearings 24, 40. This avoids vibrations and associated noise.
• the embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that only the inner bearing ring 44 of the pole housing side bearing 40 is additionally secured by a support in the form of a spring ring 48, while the inner bearing ring 28 of the transmission housing side bearing 24 is attached only with a press fit on the armature shaft 14.
• the embodiment according to FIG. 2 has, as an axial support, a sleeve 54 which replaces the spring ring 48 and is supported on the armature core 12 on the end facing away from the pole housing-end bearing 40.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Motor Or Generator Frames (AREA)
• Support Of The Bearing (AREA)
• Gear Transmission (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39770277

Family Applications (1)

Country Status (6)

Families Citing this family (3)

Family Cites Families (10)

• 2007
  • 2007-08-20 DE DE200710039243 patent/DE102007039243A1/de not_active Withdrawn
• 2008
  • 2008-06-26 EP EP08774338A patent/EP2191558A1/de not_active Withdrawn
  • 2008-06-26 CN CN200880103321A patent/CN101779362A/zh active Pending
  • 2008-06-26 BR BRPI0815347-7A2A patent/BRPI0815347A2/pt not_active IP Right Cessation
  • 2008-06-26 KR KR1020107003638A patent/KR20100047265A/ko not_active Application Discontinuation
  • 2008-06-26 WO PCT/EP2008/058155 patent/WO2009024378A1/de active Application Filing

Non-Patent Citations (1)

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