EP1735881B1 - Porte-balais pour machine electrique - Google Patents

Porte-balais pour machine electrique Download PDF

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Publication number
EP1735881B1
EP1735881B1 EP05707979A EP05707979A EP1735881B1 EP 1735881 B1 EP1735881 B1 EP 1735881B1 EP 05707979 A EP05707979 A EP 05707979A EP 05707979 A EP05707979 A EP 05707979A EP 1735881 B1 EP1735881 B1 EP 1735881B1
Authority
EP
European Patent Office
Prior art keywords
brush holder
housing
spring
brush
shaped
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.)
Not-in-force
Application number
EP05707979A
Other languages
German (de)
English (en)
Other versions
EP1735881A1 (fr
Inventor
Justus Lamprecht
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 EP1735881A1 publication Critical patent/EP1735881A1/fr
Application granted granted Critical
Publication of EP1735881B1 publication Critical patent/EP1735881B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/385—Means for mechanical fixation of the brush holder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/381—Brush holders characterised by the application of pressure to brush
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/41—Brush holders cartridge type

Definitions

  • the present invention relates to a brush holder for an electric machine, and more particularly, to a brush holder for an electric motor for power tools.
  • Brush holders for electric machines are known from the prior art in many ways. For example, in universal electric motors, as commonly used in power tools such. As angle grinders, drills, etc. are used, the necessary current application (commutation) using a commutator. The transmission of the current to the commutator takes place by means of carbon brushes. These carbon brushes are arranged in a brush holder, which must provide an exact guidance of the brush and a necessary, metered pressure. From the CH-493 115 a brush holder is known in which by means of a spring tongue and a tension spring a bias is applied to the brush. In this case, a cylindrical pressure member is provided between the brush and the pressure tongue, which presses in a V-shaped notch in the carbon brush to exert a uniform pressure force on the brush.
  • the brush holder according to the invention with the features of claim 1 has the advantage over that it is particularly easy to attach to an electric machine.
  • a fastening element is provided, which has a substantially T-shape.
  • the T-shaped fastener can be easily inserted against a correspondingly formed receptacle, so that no fastening screw o. ⁇ . Is necessary.
  • breakthroughs in the area of the electrical machine can thereby be reduced, so that a rigidity improvement of the electrical machine can be achieved.
  • the fastener includes two substantially T-shaped elements which are disposed on the brush holder at the opposite ends.
  • the T-shaped fastening element is integrally formed with the housing of the brush holder.
  • the housing of the brush holder is made of two metal strips, which are transformed by means of forming such that they form the housing with integrally formed fasteners.
  • each housing part preferably forms a leg of the T-shaped fastening element.
  • the housing may also be formed in one piece. For this purpose, a metal strip corresponding to a desired formed outer shell shape and then introduced a slot in the unshaped sheet metal strip. Then, the sheet metal strip is bent along the slot and expanded, so that a receiving space for the brush is formed.
  • the biasing member is held on the electric machine so that it is not attached to the housing of the brush holder.
  • no biasing forces act on the housing of the brush holder and further, a tendency of melting out of the usually made of metal housing of the brush holder from a plastic holder on the electric machine is greatly reduced.
  • the attachment of the biasing member to the electric machine enables the housing of the brush holder to be fixed in position by the biasing member.
  • a biasing member of the brush holder is formed as a spring, and more preferably, the spring is disposed outside of the housing.
  • a spring arm exerts the bias on the brush through a recess formed in the housing of the brush holder.
  • the spring force introduction i. the contact point with the brush, are arranged centrally on the brush, so that there is an equal force distribution at the support points of the spring.
  • the spring member is relatively far removed from a heat introduction point at the contact point to the brush, so that the spring can be well cooled.
  • the spring has two V-shaped spring ends.
  • the V-shaped spring ends are guided over the foot or web of the T-shaped fastening elements.
  • the surface of this page are wave-like formed on the housing of the brush holder on the side on which the spring is arranged, so that only a few investment points between the housing and the spring exist and the carbon brush in the smooth Quivers, even with pollution, remains. As a result, a cooling air flow between the spring and the housing can be performed.
  • the brush holder according to the invention is particularly preferably used in electric motors for power tools, since due to the large numbers of such tools, the cost advantages are particularly well come into play.
  • the spring described above can be mounted particularly easily by the spring is snapped onto the brush holder receptacle of the motor housing, the spring ends are pivoted and clipped into provided on the housing of the electric motor recesses.
  • the brush holder 1 comprises a housing 2 and a spring 7 as a biasing member.
  • the spring 7 is arranged outside of the housing 2.
  • the housing 2 consists of two parts 2a and 2b, which can be made from stamped sheets. By forming the two housing parts 2a, 2b are configured such that at the left and at the right end in each case a T-shaped fastening element 3 and 5 is illustrated. With the housing 2, the T-shaped fastening elements 3, 5 are connected in each case via the foot of the T-shaped fastening element. At the foot of the T-shaped fastening element connecting straps 4, 6 are formed (see. FIG.
  • the housing 2 is formed, which receives a carbon brush 11 in its interior.
  • the housing 2 may be integrally formed by reshaping a metal sheet according to the desired external shape and then inserting a slot closed at both ends into the metal sheet. Then, the sheet is swung along the slot and compressed to form the receiving space for the brush.
  • the connecting webs 4, 6 were the ends of the closed slot.
  • the sheet was also slotted prior to swiveling, with the slits lying in line, which also forms the pivot axis.
  • the carbon brush 11 is biased by the spring 7 to, as in FIG. 3 shown to be pressed against a rotor of an electric machine.
  • a spring arm 8 is formed on the spring 7, which exerts a biasing force on the carbon brush 11 through a recess 12 formed in the housing 2.
  • the spring arm 8 is formed in the middle of the helical coil spring 7 by a left and right-hand helix of the spring 7 is rolled up on both sides of the double-legged spring arm 8.
  • the spring 7 is further formed with V-shaped ends 9 and 10.
  • V-shaped ends 9, 10 of the spring 7 are guided over the foot of the T-shaped fastening elements 3, 5 or the connecting straps 4, 6 in such a way that the connecting straps 4, 6 lie in the inflection point of the V-shaped ends 9, 10 ,
  • a bend 22, 23 is additionally formed, which on the inside of the Brush holder receptacle 15 engage in the recesses (see. FIG. 4 ).
  • a brush terminal 13 and a terminal 14 for a field winding are provided on the brush holder 1 integral with the housing 2, which are both formed as plug-in terminals (see. Figures 1 and 2 ).
  • the brush holder 1 of the invention is inserted and fixed in a holder 15 on an electric motor housing.
  • the fixation on the holder 15 takes place on the one hand via the T-shaped fastening elements 3 and 5, which are respectively inserted into a T-shaped slot 16 and 17 (see. FIG. 3 ).
  • the brush holder 1 is fixed to the holder 15 by means of the spring 7. More precisely, two tabs 18 and 19 are provided on the holder 15 (cf. FIG. 3 ) and two recesses 20, 21 (see. FIG. 4 ).
  • the outermost ends 22 and 23 of the spring 7 engage in the recesses 20 and 21 and on the other hand, the transition between the V-shaped portions 9 and 10 and the coil spring portions of the spring 7 is held by the tabs 18 and 19. Since the spring 7 is formed symmetrically, a centered force can act on the carbon brush 11.
  • the spring 7 is held only at four locations on the holder 15 of the electric motor, namely the two tabs 18 and 19 and the two recesses 20 and 21st
  • the spring 7 can be easily attached by means of clipping and subsequent pivoting of the V-shaped ends to the bracket 15 of the electric motor.
  • the brush holder 1 is thus on the one hand by the T-shaped fasteners 3 and 5 and on the other hand by the Spring 7 itself held on the holder 15.
  • the spring 7 has a dual function, namely that of the biasing member of the carbon brush 11 and the function of fixing the housing 2 of the brush holder.
  • the spring 7 is preferably arranged outside the housing 2 and thus at a certain distance from the carbon brush 11. As a result, the engine cooling air can cool these thermally heavily loaded components of the brush holder 1 well. Furthermore, as in particular in the Figures 1 and 2 shown, the housing side 2a, on which the spring 7 is arranged outside, wave-like, so that a cooling air flow can form very well between the housing wall and the spring 7. As a result, additional cooling of the spring 7 can be achieved.
  • the brush holder 1 ensures an exact and at the same time also robust guidance of the carbon brush 11 and furthermore has a particularly compact construction.
  • the openings in the housing of the electric motor are to be as small as possible for the brush holder 1, so that increased motor housing rigidity can be achieved.
  • the symmetrical design of the spring 7 also provides a linearly variable spring force, which acts on the carbon brush 11, so that particularly uniform Kommut réelles counsel can be achieved with decreasing brush mass on the electric motor.
  • a brush holder 1 can be provided, which is particularly is inexpensive to produce and assemble.
  • the brush holder 1 has a very small size with a reduced number of parts.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Motor Or Generator Frames (AREA)

Claims (11)

  1. Porte-balais de machine électrique comprenant un boîtier (2) pour recevoir un balai (11), un élément de précontrainte (7) et un élément de fixation (3, 5) prévu sur le boîtier (2) pour fixer le porte-balai à la machine électrique,
    l'élément de fixation (3, 5) ayant principalement une forme de T,
    caractérisé en ce que
    l'élément de fixation (3, 5) comprend deux éléments pratiquement en forme de T qui se font face sur le boîtier (2).
  2. Porte-balais selon la revendication 1,
    caractérisé en ce que
    l'élément de fixation (3, 5) en forme de T est réalisé en une seule pièce avec le boîtier (2).
  3. Porte-balais selon l'une des revendications précédentes,
    caractérisé en ce que
    le porte-balais est fixé à la machine électrique par l'élément de précontrainte (7).
  4. Porte-balais selon l'une des revendications précédentes,
    caractérisé en ce que
    l'élément de précontrainte (7) est un ressort.
  5. Porte-balais selon la revendication 4,
    caractérisé en ce que
    le ressort (7) est prévu à l'extérieur du boîtier (2) et un bras élastique (8) traversant une découpe (12) du boîtier (2) exerce une précontrainte sur le balai (11).
  6. Porte-balais selon les revendications 4 ou 5,
    caractérisé en ce que
    le ressort (7) comporte principalement des extrémités (9, 10) en forme de V pour fixer le boîtier (2) à la machine électrique.
  7. Porte-balais selon la revendication 6,
    caractérisé en ce que
    les extrémités de ressort (9, 10), pratiquement en forme de V, sont guidées par un pied des éléments de fixation (3, 5) en forme de T.
  8. Porte-balais selon l'une des revendications précédentes,
    caractérisé en ce que
    l'élément de précontrainte (7) et deux pattes (18, 19) sont fixés à deux découpes (20, 21) d'un support (15) de la machine électrique.
  9. Porte-balais selon l'une des revendications précédentes,
    caractérisé en ce que
    le boîtier (2) a un côté extérieur ondulé contre lequel s'applique l'élément de précontrainte (7).
  10. Porte-balais selon l'une des revendications précédentes,
    caractérisé en ce que
    le boîtier (2) est formé de deux parties de boîtier (2a, 2b) et l'élément de fixation (3, 5) en forme de T est constitué par les deux parties de boîtier (2a, 2b) ou en ce que le boîtier (2) est en une seule pièce, avec l'élément de fixation (3, 5) en forme de T, réalisé intégralement avec le boîtier.
  11. Machine électrique, notamment moteur électrique d'outillage électrique, comprenant un porte-balais selon l'une des revendications précédentes.
EP05707979A 2004-04-06 2005-02-09 Porte-balais pour machine electrique Not-in-force EP1735881B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004016809A DE102004016809A1 (de) 2004-04-06 2004-04-06 Bürstenhalter für eine elektrische Maschine
PCT/EP2005/050559 WO2005099049A1 (fr) 2004-04-06 2005-02-09 Porte-balais pour machine electrique

Publications (2)

Publication Number Publication Date
EP1735881A1 EP1735881A1 (fr) 2006-12-27
EP1735881B1 true EP1735881B1 (fr) 2008-02-20

Family

ID=34960500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05707979A Not-in-force EP1735881B1 (fr) 2004-04-06 2005-02-09 Porte-balais pour machine electrique

Country Status (5)

Country Link
US (1) US7388314B2 (fr)
EP (1) EP1735881B1 (fr)
JP (1) JP4361949B2 (fr)
DE (2) DE102004016809A1 (fr)
WO (1) WO2005099049A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5135873B2 (ja) * 2006-05-24 2013-02-06 株式会社デンソー 電動モータおよび燃料ポンプ
US7696666B2 (en) 2006-10-06 2010-04-13 Remy Technologies, L.L.C. Dynamoelectric machine grommet
US7705512B2 (en) 2006-10-06 2010-04-27 Remy International, Inc. Dynamoelectric machine conductor
FR2996369B1 (fr) * 2012-09-28 2016-06-03 Valeo Equip Electr Moteur Cage a balai pour porte-balai de machine electrique et porte-balais correspondant
FR2996368B1 (fr) * 2012-09-28 2015-11-13 Valeo Equip Electr Moteur Balai de machine electrique et porte-balais correspondant
US20150194859A1 (en) 2013-08-09 2015-07-09 Black & Decker Inc. Power tool having improved motor fan assembly
US9991770B2 (en) 2013-08-09 2018-06-05 Black & Decker Inc. Spring post for brush card for a power tool

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628075A (en) * 1970-11-06 1971-12-14 Gen Motors Corp Brush holder assembly for dynamoelectric machines
DE2947517C2 (de) * 1979-11-24 1982-07-15 VAT Aktiengesellschaft für Vakuum-Apparate-Technik, Haag Glanzmetall-Ventilschieber für Hochvakuumanlagen
DE4407976C1 (de) * 1994-03-10 1995-04-13 Andreas Szeteli Hydraulisches Absperrventil
US5731650A (en) * 1994-11-14 1998-03-24 Lucas Aerospace Power Equipment Corp. Dynamoelectric machine with brush wear sensor
DE19717594B4 (de) 1997-04-25 2017-09-07 BSH Hausgeräte GmbH Bürstenanordnung an einer elektrischen Maschine
JP3486094B2 (ja) * 1998-03-23 2004-01-13 三菱電機株式会社 電動機用ブラシ保持装置とその装置におけるブラシ保持枠の組付方法
DE19822574C1 (de) * 1998-05-20 1999-10-14 Raymond A & Cie Lösbare Schnellkupplung mit automatischer Montageanzeige

Also Published As

Publication number Publication date
EP1735881A1 (fr) 2006-12-27
JP4361949B2 (ja) 2009-11-11
WO2005099049A1 (fr) 2005-10-20
DE502005002926D1 (de) 2008-04-03
US20070241631A1 (en) 2007-10-18
US7388314B2 (en) 2008-06-17
JP2007532087A (ja) 2007-11-08
DE102004016809A1 (de) 2005-10-27

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