EP3217488A1 - Systeme de balais de charbon - Google Patents

Systeme de balais de charbon Download PDF

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Publication number
EP3217488A1
EP3217488A1 EP16159607.7A EP16159607A EP3217488A1 EP 3217488 A1 EP3217488 A1 EP 3217488A1 EP 16159607 A EP16159607 A EP 16159607A EP 3217488 A1 EP3217488 A1 EP 3217488A1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
shut
lid
brush assembly
arrangement
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.)
Withdrawn
Application number
EP16159607.7A
Other languages
German (de)
English (en)
Inventor
Wolfgang Schreiber
Armin Hoffmann
Helmut Burger
Rainer Ontl
Ralph Abel
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Priority to EP16159607.7A priority Critical patent/EP3217488A1/fr
Priority to PCT/EP2017/055296 priority patent/WO2017153391A1/fr
Publication of EP3217488A1 publication Critical patent/EP3217488A1/fr
Withdrawn legal-status Critical Current

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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
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear
    • 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
    • H01R39/59—Means structurally associated with the brushes for interrupting current
    • 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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/26—Solid sliding contacts, e.g. carbon brush
    • H01R39/27—End caps on carbon brushes to transmit spring pressure

Definitions

  • the present invention relates to a carbon brush assembly having a carbon brush and a shut-off member having an electrically insulating shut-off body and a biased, acting on the shutdown compression spring.
  • Carbon brush assemblies with carbon brush and Abschaltorgan serve the circuit interruption of an electric motor, such as an electric motor of a power tool.
  • an electric motor such as an electric motor of a power tool.
  • abrasion of the carbon brush takes place on the part of the commutator. If a maximum wear length of the carbon brush is reached, the shut-off member comes so to bear, that the prestressed, acting on the shut-off body compression spring lifts the brush assembly from the commutator, whereby the circuit is interrupted.
  • the invention is achieved in that the carbon brush assembly has a back attached to the carbon brush lid, wherein the shut-off is disposed within a lid volume and is preferably integrated in the lid.
  • the invention includes the recognition that in carbon brush assemblies of the prior art, the shutdown member is typically pulped in the carbon brush. In order to be correspondingly fixed or stably positioned in the carbon brush, the shut-off device must be placed at a certain distance from the end of the rear carbon brush. Due to the volume of Abschaltorgans and the volume of ramming mass, that is, the material with which the Abschaltorgan is peeled in the carbon brush, the installation of Abschaltorganes needs allerding a certain distance from the carbon brush back. The carbon brush is thereby comparatively long and at the same time has a relatively short service life.
  • the carbon brush assembly according to the invention has a rear side attached to the carbon brush lid, wherein the shut-off member is disposed within a lid volume, preferably completely within the lid volume, these disadvantages are avoided.
  • the rear-mounted lid also prevents lateral wear of the carbon brush.
  • shut-off element of a carbon brush assembly according to the invention no longer needs to be pulped, advantageously this saves tamping volume.
  • the shut-off can be placed further in the direction of the carbon brush back. This advantageously leads to the same outer dimensions of the carbon brush to increase the Verschleisshey.
  • the carbon brush on a gradation, which surrounds the lid at least partially from the outside.
  • the lid is preferably glued to the carbon brush, or locked with this.
  • the gradation is formed as a brim, which is oriented transversely to a longitudinal axis of the carbon brush and preferably completely circumscribes the carbon brush.
  • the carbon brush may have a rear, preferably cylindrical recess.
  • the recess preferably extends, based on the carbon brush length, in the region and / or within the gradation. The recess can only run in the range of gradation.
  • shut-off is supported on a lid inside the lid.
  • the shut-off can, for example, be integrated into the cover such that the compression spring of the shut-off element is at least partially cast in the lid, for example by encapsulation.
  • the lid has plastic.
  • the lid can be made of plastic.
  • the plastic is electrically insulating. Lid, compression spring and shut-off can be made in one piece by injection molding.
  • cover and the carbon brush are circumferentially identical along a circumference of the carbon brush arrangement.
  • the circumference is defined transversely, in particular perpendicular to the longitudinal axis of the carbon brush assembly.
  • the compression spring is designed as a cylindrical helical spring.
  • the carbon brush assembly has a wire electrically connected to the carbon brush.
  • a lid opening is formed on the back of the lid, through which the strand can be passed.
  • the carbon brush assembly has a plug contact, for example in the form of a crimp plug, which is electrically connected to the strand.
  • the shut-off device is preferably supported free of distortion.
  • the lid may in turn have a rear recess which serves to hold the carbon brush assembly in a hand tool.
  • a carbon brush assembly 10 is shown in FIG Fig. 1 shown. This has a carbon brush 1 and a shut-off 2.
  • the shut-off device has an electrically insulating shut-off body 3 and a prestressed compression spring 4 acting on the shut-off body 3.
  • the compression spring 4 is formed as a cylindrical coil spring.
  • a cover 5 of the carbon brush assembly 10 is arranged at the rear side R of the carbon brush assembly 10.
  • the shut-off member 2 is, if, as in Fig. 1 shown, the lid 5 is fixed to the carbon brush 1, completely disposed within a lid volume.
  • the cover 5 is terminal on the rear side R, which faces away from the commutator K arranged.
  • the carbon brush assembly 10 of Fig. 1 has a wire 8 electrically connected to the carbon brush 1.
  • the carbon brush assembly 10 has a plug contact 8 ', which is connected to the electrical wire both electrically and mechanically.
  • Fig. 2 shows an exploded view of a carbon brush assembly 10 looking from the commutator K.
  • the shut-off 2 is shown schematically in this as well as the following figures, that is, the shut-off body and the compression spring (see. Fig. 1 ) are not shown separately.
  • Fig. 2 can be removed, the shut-off device 2 is disposed completely within a volume of the lid 5.
  • On the carbon brush 1 a gradation 6 is formed, which can completely surround the cover 5 from the outside.
  • the gradation 6, which completely circumscribes the carbon brush 1, is in Fig. 3 clearly visible.
  • Fig. 3 shows the embodiment Fig. 2 with a view from the rear side R in the direction of the commutator side K.
  • the cover 5 (cf. Fig. 2 ) not shown.
  • a cylindrical recess 7 is formed, which extends in the direction of the commutator K side.
  • the shut-off member 2 (see. Fig. 2 protrude when the cover 5 is arranged on the carbon brush 1.
  • Fig. 4 finally shows the preferred embodiment of Figures 2 and 3 , wherein the lid 5 is mounted to the carbon brush 1 by gluing and the cover the gradation 6 (see. Fig. 3 ) completely engages from the outside.
  • Fig. 4 can be removed, the cover and the carbon brush 1 along a circumference U of the brush assembly 10 are equal in circumference.
  • the carbon brush assembly 10 has a wire 8 electrically connected to the carbon brush 1, which is passed through a lid opening 9 formed on the back of the lid 5. Electrically and mechanically connected to the strand 8, is a plug contact in the form of a Crimpsteckers.
  • Fig. 5 finally shows a cover of the embodiment of FIGS. 2 to 4 , Good to see that the shut-off device 2 is mounted centrally in the lid 5 and is disposed within a lid volume 5 spanned by the lid. Off-center, a lid opening 9 is shown, which is formed on the back R on the lid 5.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
EP16159607.7A 2016-03-10 2016-03-10 Systeme de balais de charbon Withdrawn EP3217488A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16159607.7A EP3217488A1 (fr) 2016-03-10 2016-03-10 Systeme de balais de charbon
PCT/EP2017/055296 WO2017153391A1 (fr) 2016-03-10 2017-03-07 Ensemble balai de charbon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16159607.7A EP3217488A1 (fr) 2016-03-10 2016-03-10 Systeme de balais de charbon

Publications (1)

Publication Number Publication Date
EP3217488A1 true EP3217488A1 (fr) 2017-09-13

Family

ID=55521623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16159607.7A Withdrawn EP3217488A1 (fr) 2016-03-10 2016-03-10 Systeme de balais de charbon

Country Status (2)

Country Link
EP (1) EP3217488A1 (fr)
WO (1) WO2017153391A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023537A1 (fr) * 1979-07-21 1981-02-11 REKOFA Wenzel GmbH & Co KG. Balai de charbon avec dispositif de coupure
DE3047421A1 (de) * 1980-12-17 1982-07-15 Ringsdorff-Werke GmbH, 5300 Bonn Abschaltbuerste
DE4304527A1 (de) * 1993-02-15 1994-08-18 Miele & Cie Abschaltkohlebürste für Kollektormotoren, insbesondere für einen Staubsauger-Gebläsemotor
DE29805259U1 (de) * 1998-03-24 1999-07-29 Robert Bosch Gmbh, 70469 Stuttgart Kommutierungsbürste für elektrische Kommutatormaschinen
DE102005063170A1 (de) * 2005-12-30 2007-07-05 Schunk Kohlenstofftechnik Gmbh Kohlebürste mit Abschalteinrichtung
DE102010042804A1 (de) 2010-10-22 2012-04-26 Robert Bosch Gmbh Kohlebürste mit Abschaltvorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023537A1 (fr) * 1979-07-21 1981-02-11 REKOFA Wenzel GmbH & Co KG. Balai de charbon avec dispositif de coupure
DE3047421A1 (de) * 1980-12-17 1982-07-15 Ringsdorff-Werke GmbH, 5300 Bonn Abschaltbuerste
DE4304527A1 (de) * 1993-02-15 1994-08-18 Miele & Cie Abschaltkohlebürste für Kollektormotoren, insbesondere für einen Staubsauger-Gebläsemotor
DE29805259U1 (de) * 1998-03-24 1999-07-29 Robert Bosch Gmbh, 70469 Stuttgart Kommutierungsbürste für elektrische Kommutatormaschinen
DE102005063170A1 (de) * 2005-12-30 2007-07-05 Schunk Kohlenstofftechnik Gmbh Kohlebürste mit Abschalteinrichtung
DE102010042804A1 (de) 2010-10-22 2012-04-26 Robert Bosch Gmbh Kohlebürste mit Abschaltvorrichtung

Also Published As

Publication number Publication date
WO2017153391A1 (fr) 2017-09-14

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