EP2630703B1 - Balai de charbon comportant un dispositif de coupure - Google Patents

Balai de charbon comportant un dispositif de coupure Download PDF

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Publication number
EP2630703B1
EP2630703B1 EP11769857.1A EP11769857A EP2630703B1 EP 2630703 B1 EP2630703 B1 EP 2630703B1 EP 11769857 A EP11769857 A EP 11769857A EP 2630703 B1 EP2630703 B1 EP 2630703B1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
spring
compression
spring body
compression spring
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
EP11769857.1A
Other languages
German (de)
English (en)
Other versions
EP2630703A1 (fr
Inventor
Manfred Lutz
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 EP2630703A1 publication Critical patent/EP2630703A1/fr
Application granted granted Critical
Publication of EP2630703B1 publication Critical patent/EP2630703B1/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
    • H01R39/59—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
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear

Definitions

  • the invention relates to a carbon brush with shutdown device according to the preamble of claim 1.
  • a known carbon brush of this type ( DE 1 763 744 A1 ) Is contained in the cavity of the carbon brush a resilient single body, which unites the compression spring body and the shutdown body in one element.
  • the single body is designed as a resilient plastic cylinder, which is biased in the cavity and is held by a fixing device in the form of a lid, which covers the single body and the end face of the brush body.
  • Carbon brushes of this type are known ( DE 1 679 529 U1 ), in which the compression spring body consists of a cylindrical helical spring made of spring steel, which can be biased and compressed to reach the smallest possible overall length of the system of the shutdown device and a maximum wear path of the brush body so far that their cylindrical turns lie on each other and the spring is biased on block.
  • the maximum usable wear path of the brush body is determined, which results from the ratio of the possible theoretical wear path of the carbon brush to the length of the shutdown device.
  • a shorter wear path than the actual usable length of the brush body requires an early replacement of the carbon brushes if they have exceeded the permissible wear path.
  • Cylindrical coil springs made of metal as a compression spring body are expensive and can be damaged, z. B.
  • the compression spring body has an integral cylindrical projection at one end, which is pressed as Einpressteil in the cavity and is held tightly and firmly by press connection, the resilient behavior of the plastic material is not only used to seal the cavity but also for pressing in the cavity, whereby the compression spring body is so firmly connected by means of press connection with additional seal with the brush body that the support forces of the compression spring body are received by the press connection.
  • the carbon brush with shutdown device has the advantage that due to the plastic material, the cost of the carbon brush can be reduced and also a shorter, crowded design of the shutdown device can be achieved.
  • Plastic material also has the advantage of facilitated molding for various designs. Furthermore, this creates the conditions for the components compression spring body and Abschalt analyses can be designed as a one-piece component.
  • the shutdown device can also be produced in the 2K process. Since plastic material due to the resilient behavior with appropriate design has a sealing effect, can be dispensed with an upper-side cutting disc, which is otherwise necessary for metallic springs so that during the Verstampfung no metallic powder enters the cavity of the brush body, thereby blocking a local metallic spring could.
  • the resilient pressure spring body made of plastic and its bending stiffness compared to cylindrical metallic coil springs can be increased so that the compression spring body can withstand large lateral forces without greater skewing and thus reliably damage to the commutator of the electric motor, to the carbon brushes and other components of a Electric device can be avoided and thereby eliminated repair costs.
  • the pressure spring body is formed of thermoplastic material.
  • the compression spring body and the shutdown body can also be united to form a materially integral component made of plastic.
  • Such a one-piece component as a shutdown device is particularly simple and inexpensive.
  • the axial dimension of the shutdown device can be kept small in this and thereby the usable wear length of the carbon brush be further increased, with all the resulting advantages.
  • the pressure spring body consists of an elastomer. Also in this case, it may be advantageous if the compression spring body and the shutdown body are formed as a one-piece component.
  • the pressure spring body is formed from at least one spring made of plastic material.
  • the spring z. B. be formed as bellows or spring coils have. It may be advantageous if the spring coils are in the prestressed, compressed state while shortening the spring at least partially into each other. As a result, a shortening in the region of the pressure spring body in the prestressed state can be achieved, with the result that an increase in the usable wear length of the carbon brush is achieved. It is understood that even with such a design spring body this can be united with the shutdown of plastic to a materially integral component. Also, different materials for the part constituting the compression spring body and for the other part forming the shut-off body of the one-piece component are possible, and production can be made in the 2K process.
  • the compression spring body closes the end of the cavity of the brush body while sealing against material entry of an evaporation to be introduced above it. This can be dispensed with a special blade. This leads to a reduction in the axial dimensions of the shutdown device and also reduces costs due to omission of the cutting disc. The shutdown device becomes even more compact. For the sealing of the cavity against the material input of the metallic powder in the Verstampfung the sealing effect of the plastic material is used.
  • the compression spring body is formed from a plastic foam body.
  • a plastic foam body Such is made of foamed plastic and has a sufficiently resilient behavior.
  • the compression spring body can in this case z. B. be formed of a compressible polyurethane foam and an approximately cylindrical body in the Having education as a one-piece component, which is effective as a spring buffer and at the lower end in the one-piece design forms the part that is a shut-off body in two-part design.
  • a special simplification is achieved.
  • the number of necessary components of the shutdown device is reduced to this one-piece plastic foam body, which also makes a cutting disc below the Verstaubung dispensable due to the sealing behavior.
  • In the cavity of the brush body is then only the plastic foam body, wherein the cavity is closed at the open end by means of the Verstampfung, which receives the supporting forces for the plastic foam body.
  • the compression spring body is formed by itself or in the form of the integral with the shutdown body component as a hollow body or as a solid body.
  • a first embodiment of a carbon brush 10 with shutdown device 20 is shown.
  • Carbon brushes 10 of this type provide in a known manner the electrical contact to the commutator of electric motors, as they are used for example for electrical appliances for household or craft, especially for electric hand tool machines.
  • Such carbon brushes 10 consist of a brush body 11 made of graphite, in which usually the electrical connection is pressed or otherwise connected thereto.
  • the necessary contact pressure with which the brush body 11 is pressed against the commutator of the electric motor is effected by a spring element z. B. in the form of a coil spring ( EP 0 937 320 B1 ).
  • the shutdown device 20 has the purpose to protect the commutator of the electric motor after wear of the carbon brushes from mechanical damage or burns.
  • the shutdown device 20 has a shut-off body 21 made of electrically insulating material, which is designed as a pin or Abschaltnippel.
  • the shut-off body 21 on a rounded head 22 with rear pin approach 23.
  • a biased, the shut-off body 21 is resilient in Fig. 1 downwardly biasing compression spring body 24 is provided which engages with one end on the shut-off body 21.
  • the brush body 11 is provided with a z. B.
  • cylindrical cavity 12 is provided, in which the compression spring body 24 and the shut-off body 21 are held.
  • the cavity 12 is at in Fig.
  • a so-called Verstampfung 14 is provided from metallic powdery materials through which the supporting forces of the compression spring body 24 are received and fed into the brush body 11.
  • the cutting disk 13 prevents metal powder during the process of the Verstampfung can reach into the region of the cavity 12 and thus in the region of the pressure spring body 24, which could lead to disturbances during the shutdown process.
  • the shut-off device 20 is shown in the tensioned state of the compression spring body 24, wherein the brush body 11 is not shown broken off in terms of its full length.
  • the individual components of the switch-off device 20, that is to say the switch-off body 21, the compression spring body 24, the cutting disk 13 and the damping 14, determine a certain overall length of the system and determine the usable wear path of the carbon brush 10.
  • the total length of the carbon brush 10 is usually determined by the construction of the electrical appliance, so that with a corresponding overall length of the system of the shutdown device 20, a residual wear path remains as a real effective length. If this wear path is exceeded, replacement of the carbon brushes 10 is necessary.
  • the compression spring body 24 according to the first embodiment and according to the invention is formed of plastic and resilient. He exists z. B. of an elastomer.
  • the compression spring body 24 has the shape of a spring 25, said spring 25 z. B. is formed as a bellows 26 whose wall 27 is corrugated, resulting in rib-like projections, which are either approximately annular with respect to the longitudinal central axis and parallel to each other or extend spirally.
  • the spring 25 is z. B. formed as a hollow body. At the lower end in the drawing of this compression spring body 24 of the shut-off body 21 is attached. The upper end of the cavity 12 is closed by means of the cutting disc 13, over which the Verstampfung 14 is provided.
  • the design of the compression spring body 24 made of plastic makes it possible due to the sealing effect of the plastic material to dispense with the cutting wheel 13 and to use the compression spring body 24 directly with the upper end as a sealing element. If at the upper end of the compression spring body 24 a particular cylindrical extension integrally formed, the compression spring body 24 can be pressed with this extension into the cavity 12 from above.
  • the extension is dimensioned so that it is held by means of press connection in the cavity 12 and thereby replaces the Verstampfung 14, which leads to a further simplification.
  • the shut-off body 21 may be made of insulating material, in particular of plastic, for. B. made of a fiber-reinforced plastic.
  • the compression spring body 24 and the shut-off body 21 according to Fig. 1 and 2 united to a material integral plastic component.
  • This is particularly advantageous in terms of the axial dimensions and in terms of cost, since a one-piece element 21, 24 is particularly cost-effective and thereby also the number of necessary components of the shutdown device 20 is reduced.
  • this one-piece design it is also possible to manufacture this one-piece component 21, 24 from different plastic materials according to the 2K method.
  • bellows 26 of the Durckfederève Society 24 is a hollow body. It can be seen that other designs are also in expert knowledge, in which the pressure spring body 24 and / or the shut-off body 21 are formed from plastic.
  • the compression spring body 24 is again made of plastic and resilient. It can be formed from a thermoplastic material.
  • the compression spring body 24 is formed as an approximately cylindrical coil spring 25 with a plurality of spring coils 28, 29, 30, wherein the spring coils are spiral.
  • the compression spring body 24 according to 3 and 4 also have such spring coils that at least partially lie in each other at least in the prestressed, compressed state while shortening the compression spring body 24.
  • a cutting disc 13 is shown, which is necessary when the spring 25 is not able to seal the cavity 12 due to their material-related sealing ability against the material of Verstampfung 14.
  • the compression spring body 24 and the shut-off body 21 are combined to form a one-piece plastic component and thus constitute an integral component of the shutdown device 20.
  • the plastic material of this one-piece component 21, 24 is electrically insulating and thus for this one-piece design of shut-off body 21 and compression spring body 24th best for.
  • the spring 25 at the upper end as a replacement for the cutting disc 13 and the Verstampfung 14 a sealing cylindrical, thus integral extension, which is pressed tightly and firmly as Einpressteil in the cavity 12 and seals and receives the supporting force of the spring 25.
  • shut-off body 21 and the compression spring body 24 are also combined to form a one-piece component made of plastic, wherein this one-piece component consists of a plastic foam body, z. B. made of compressible resilient polyurethane foam.
  • the one-piece component of shut-off body 21 and compression spring body 24 may be designed as a hollow body or solid body.
  • the cutting disc 13 is not present. The end of the cavity 12 is sealed by the material-related sealing behavior of the integral component 21, 24 made of plastic.
  • FIG. 7 The fourth embodiment shown differs from that in FIGS. 5 and 6 Characterized in that the compression spring body 24 at the upper end in the drawing has a cylindrical extension 31 integral therewith, which is pressed into the cavity 12 as a press-fit part.
  • a seal of the cavity and on the other hand by the press connection secure attachment of the compression spring body 24 in the brush body 11 is achieved by press connection, through which the support forces are absorbed.
  • the Verstampfung 15 is dispensable.
  • the shutdown device 20 is thereby particularly simple, since this is reduced to a single component which is to be inserted into the cavity 12.
  • the compression spring body 24 and the shut-off body 21 are formed of plastic and z. B. are executed in a particularly advantageous manner as a one-piece component, the number of necessary components of the shutdown device 20 can be significantly reduced.
  • the shutdown device 20 is thereby substantially simplified, compact and inexpensive.

Landscapes

  • Motor Or Generator Current Collectors (AREA)

Claims (9)

  1. Balai de charbon avec dispositif de coupure, qui présente dans une cavité (12) du corps de balai (11), un corps de coupure (21) constitué d'un matériau électriquement isolant, avec un corps de ressort de compression (24) précontraint, sollicitant élastiquement par ressort le corps de coupure (21), le corps de ressort de compression (24) et/ou le corps de coupure (21) étant formés en plastique, caractérisé en ce que le corps de ressort de compression (24) présente à une extrémité une saillie cylindrique d'une seule pièce (31) qui est pressée en tant que partie de pressage dans la cavité (12) et qui y est maintenue de manière hermétique et fixe par une connexion par pressage.
  2. Balai de charbon selon la revendication 1, caractérisé en ce que le corps de ressort de compression (24) est formé d'un plastique thermoplastique.
  3. Balai de charbon selon la revendication 1, caractérisé en ce que le corps de ressort de compression (24) est formé d'un élastomère.
  4. Balai de charbon selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le corps de ressort de compression (24) est formé d'au moins un ressort (25) en plastique.
  5. Balai de charbon selon la revendication 4, caractérisé en ce que le ressort (25) est réalisé sous forme de soufflet (26) ou présente des enroulements de ressort (28 à 30), les enroulements de ressort (28 à 30) pouvant être disposés de préférence au moins en partie les uns dans les autres dans l'état précontraint comprimé en raccourcissant le ressort (25).
  6. Balai de charbon selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le corps de ressort de compression (24) ferme l'extrémité de la cavité (12) en réalisant l'étanchéité, par rapport à la pénétration de matériau, d'un bouchon (14) à appliquer par dessus.
  7. Balai de charbon selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le corps de ressort de compression (24) est formé d'un corps en mousse de plastique.
  8. Balai de charbon selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le corps de ressort de compression (24) est réalisé sous forme de corps creux ou sous forme de corps plein.
  9. Balai de charbon selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le corps de ressort de compression (24) et le corps de coupure (21) sont réunis pour former un composant en plastique d'une seule pièce venue de matière, la partie constituant le corps de coupure se composant également de plastique.
EP11769857.1A 2010-10-22 2011-10-11 Balai de charbon comportant un dispositif de coupure Not-in-force EP2630703B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010042807A DE102010042807A1 (de) 2010-10-22 2010-10-22 Kohlebürste mit Abschaltvorrichtung
PCT/EP2011/067704 WO2012052318A1 (fr) 2010-10-22 2011-10-11 Balai de charbon comportant un dispositif de coupure

Publications (2)

Publication Number Publication Date
EP2630703A1 EP2630703A1 (fr) 2013-08-28
EP2630703B1 true EP2630703B1 (fr) 2016-06-29

Family

ID=44800030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11769857.1A Not-in-force EP2630703B1 (fr) 2010-10-22 2011-10-11 Balai de charbon comportant un dispositif de coupure

Country Status (4)

Country Link
US (1) US20130293059A1 (fr)
EP (1) EP2630703B1 (fr)
DE (1) DE102010042807A1 (fr)
WO (1) WO2012052318A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1679529U (de) 1954-04-14 1954-07-08 Kohlenbuersten Und Elemente Fa Abschaltbare kohlebuerste.
US2813208A (en) * 1954-04-20 1957-11-12 George D Ritter Electrical contact brush
US2986666A (en) * 1959-05-18 1961-05-30 Tsutsumi Kentaro Brush assembly units
DE1763744A1 (de) * 1968-07-31 1971-12-23 Schunk & Ebe Gmbh Kohlebuerste mit Abschaltvorrichtung
DE7010521U (de) * 1970-03-21 1971-08-26 Bosch Gmbh Robert Abschaltkohlebuerste.
DE2135617A1 (de) * 1971-07-16 1973-01-25 Hans Joachim Bamert Abschaltkohlebuerste
DE2801839A1 (de) * 1978-01-17 1979-07-19 Bosch Gmbh Robert Abschaltkohlebuerste
DE3047421A1 (de) * 1980-12-17 1982-07-15 Ringsdorff-Werke GmbH, 5300 Bonn Abschaltbuerste
JPH03270661A (ja) * 1990-03-19 1991-12-02 Fuji Electric Co Ltd 接地用ブラシ保持装置
US5648706A (en) * 1995-09-28 1997-07-15 S-B Power Tool Company Electric brake for commutated motor
DE29716245U1 (de) 1997-09-10 1999-01-21 Robert Bosch Gmbh, 70469 Stuttgart Elektrohandwerkzeugmaschine
US7237524B2 (en) * 2004-05-26 2007-07-03 Sri International Compliant walled combustion devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN103181038A (zh) 2013-06-26
WO2012052318A1 (fr) 2012-04-26
EP2630703A1 (fr) 2013-08-28
US20130293059A1 (en) 2013-11-07
DE102010042807A1 (de) 2012-04-26
RU2013123097A (ru) 2014-11-27

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