EP0449909B1 - Graphite trolley shoe and process for its manufacture - Google Patents

Graphite trolley shoe and process for its manufacture Download PDF

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Publication number
EP0449909B1
EP0449909B1 EP90900814A EP90900814A EP0449909B1 EP 0449909 B1 EP0449909 B1 EP 0449909B1 EP 90900814 A EP90900814 A EP 90900814A EP 90900814 A EP90900814 A EP 90900814A EP 0449909 B1 EP0449909 B1 EP 0449909B1
Authority
EP
European Patent Office
Prior art keywords
carbon
contact
power supply
pressed
carbon material
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.)
Expired - Lifetime
Application number
EP90900814A
Other languages
German (de)
French (fr)
Other versions
EP0449909A1 (en
Inventor
Peter Hoffmann
Johann Höll
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.)
Hoffmann and Co Elektrokohle AG
Original Assignee
Hoffmann and Co Elektrokohle 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 Hoffmann and Co Elektrokohle AG filed Critical Hoffmann and Co Elektrokohle AG
Priority to AT90900814T priority Critical patent/ATE88039T1/en
Publication of EP0449909A1 publication Critical patent/EP0449909A1/en
Application granted granted Critical
Publication of EP0449909B1 publication Critical patent/EP0449909B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49119—Brush
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/4921—Contact or terminal manufacturing by assembling plural parts with bonding
    • Y10T29/49211—Contact or terminal manufacturing by assembling plural parts with bonding of fused material
    • Y10T29/49213—Metal

Definitions

  • the invention relates to a carbon grinder with a pressed base body made of a first carbon material, which is provided on one side surface with a support made of a second carbon material with lower conductivity, and with at least one power supply line embedded in the carbon grinder.
  • Such a carbon grinder is already known from FR-A-2 339263.
  • Such carbon grinding pieces are usually produced in a single pressing process, with corresponding layers of the first and the second carbon material in powder form being filled into the pressing mold and these then being pressed at the same time by means of a press ram for the finished carbon grinding piece provided with the support.
  • the end of the power supply line is simultaneously pressed into the mass to be pressed by means of the press ram and is firmly embedded in the mass during the pressing.
  • the power supply line is led out of the coal grinder on the same side surface that also with the Pad made of the low conductivity carbon material is covered.
  • the invention has for its object to design a carbon grinder of the type mentioned so that the contact resistance between the power supply and the carbon grinder remains unaffected by the second carbon material forming the support, even if the power supply line on the side bearing the support from the Carbon grinder is led out.
  • this object is achieved in that the support only partially covers the side surface of the carbon grinder and that the power supply line on the same side surface in its area left free from the support is led out of the contact strip.
  • the support consists of a pre-pressed part made of the second carbon material, which is non-releasably press-connected to the base body made of the first carbon material.
  • Fig. 1 is a perspective view of a carbon grinder according to the invention.
  • 2 and 3 are schematic representations of the manufacture of the carbon grinder.
  • the carbon grinder 1 is, for example, cuboid and carries on its one side surface 3 a support 2 embedded in the carbon grinder, which however only covers part of this side surface, so that an area 3a of the side surface is left free becomes.
  • two power supply cables 4, which are embedded in the carbon grinder 1 and pressed with it, are led out of the carbon grinder.
  • the narrow side 5, which is at right angles to the side surface 3, represents the running surface of the carbon grinder, for example, which rests against a commutator ring.
  • the support 2 and 3 can be carried out as follows: In a separate mold (not shown), the support 2 is pre-pressed in the form of a flat cuboid preform, namely from a carbon material of lower conductivity, for example from pure graphite. Then the actual die 7 for the carbon grinder is filled with the first carbon material 1 ', which is a material with high conductivity, in particular a mixture of graphite and metal powder. The preform is placed on the surface of the filled powder layer 1 '. A stamp 9, which contains openings for receiving the power supply cable 4, is then lowered onto this arrangement from above.
  • the ends of the power supply cable 4 are pressed in time next to the preform 2 in the powder mass 1 'and then in the same operation the powder mass 1' together with the preform 2 and pressed pressed so that the carbon grinder 1 is formed as a composite body.

Landscapes

  • Polishing Bodies And Polishing Tools (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Disintegrating Or Milling (AREA)
  • Inert Electrodes (AREA)

Abstract

PCT No. PCT/EP89/01579 Sec. 371 Date Jun. 18, 1991 Sec. 102(e) Date Jun. 18, 1991 PCT Filed Dec. 20, 1989 PCT Pub. No. WO90/07211 PCT Pub. Date Jun. 28, 1990.A press-molded collector shoe having a body made of a first carbon piece, and a layer disposed on a side thereof made of a second, less conductive carbon piece. The second piece covers only a portion of the side of the collector shoe. An electrical lead projects from a portion of the side which is not covered by the second piece. During the production of the collector shoe the surface layer is pre-pressed in a separate step and the first carbon piece into which the lead wire is imbedded and the second piece are then pressed together.

Description

Die Erfindung betrifft ein Kohleschleifstück mit einem gepreßten Grundkörper aus einem ersten Kohlewerkstoff, der auf einer Seitenfläche mit einer Auflage aus einem zweiten Kohlewerkstoff mit geringerer Leitfähigkeit versehen ist, und mit mindestens einer in das Kohleschleifstück eingebetteten Stromzuleitung.The invention relates to a carbon grinder with a pressed base body made of a first carbon material, which is provided on one side surface with a support made of a second carbon material with lower conductivity, and with at least one power supply line embedded in the carbon grinder.

Ein derartiges Kohleschleifstück ist aus FR-A-2 339263 schon bekannt.Such a carbon grinder is already known from FR-A-2 339263.

Derartige Kohleschleifstücke werden üblicherweise in einem einzigen Preßvorgang hergestellt, wobei in die Preßform entsprechende Schichten aus dem ersten und dem zweiten Kohlewerkstoff in Pulverform eingefüllt und diese dann mittels eines Preßstempels zum fertigen, mit der Auflage versehenen Kohleschleifstück gleichzeitig verpreßt werden. Das Ende der Stromzuleitung wird dabei gleichzeitig mittels des Preßstempels in die zu pressende Masse eingedrückt und beim Pressen in dieser fest eingebettet. Für manche Anwendungsfälle des Kohleschleifstücks ist es erforderlich, daß die Stromzuleitung auf der gleichen Seitenfläche aus dem Kohleschleifstück herausgeführt wird, die auch mit der Auflage aus dem Kohlewerkstoff geringer Leitfähigkeit bedeckt ist. Wird ein solches Kohleschleifstück in der beschriebenen, üblichen Art hergestellt, so muß das Ende der Stromzuleitung durch die Auflagenschicht hindurch in den Grundkörper eingedrückt werden, und es ist dabei unvermeidlich, daß Teile des zweiten Kohlewerkstoffs mit geringerer Leitfähigkeit von der Stromzuleitung mitgenommen und in den ersten Kohlewerkstoff hineingedrückt werden. Dies bedeutet, daß Teile des zweiten Kohlewerkstoffs sich in unkontrollierter Weise zwischen die Stromzuleitung und den ersten Kohlewerkstoff einlagern und den Übergangswiderstand zwischen der Stromzuleitung und dem Kohleschleifstück in unkontrollierter Weise beeinflussen können.Such carbon grinding pieces are usually produced in a single pressing process, with corresponding layers of the first and the second carbon material in powder form being filled into the pressing mold and these then being pressed at the same time by means of a press ram for the finished carbon grinding piece provided with the support. The end of the power supply line is simultaneously pressed into the mass to be pressed by means of the press ram and is firmly embedded in the mass during the pressing. For some applications of the coal grinder, it is necessary that the power supply line is led out of the coal grinder on the same side surface that also with the Pad made of the low conductivity carbon material is covered. If such a carbon grinder is produced in the usual manner described, the end of the power supply line must be pressed through the support layer into the base body, and it is inevitable that parts of the second carbon material with lower conductivity are carried along by the power supply line and in the first Carbon material are pressed in. This means that parts of the second carbon material accumulate in an uncontrolled manner between the power supply line and the first carbon material and can influence the contact resistance between the power supply line and the carbon contact piece in an uncontrolled manner.

Der Erfindung liegt die Aufgabe zugrunde, ein Kohleschleifstück der genannten Art so auszubilden, daß der Übergangswiderstand zwischen der Stromzuleitung und dem Kohleschleifstück von dem die Auflage bildenden zweiten Kohlewerkstoff unbeeinflußt bleibt, und zwar auch dann, wenn die Stromzuleitung auf der die Auflage tragenden Seitenfläche aus dem Kohleschleifstück herausgeführt ist.The invention has for its object to design a carbon grinder of the type mentioned so that the contact resistance between the power supply and the carbon grinder remains unaffected by the second carbon material forming the support, even if the power supply line on the side bearing the support from the Carbon grinder is led out.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Auflage die Seitenfläche des Kohleschleifstücks nur teilweise bedeckt und daß die Stromzuleitung an der gleichen Seitenfläche in deren von der Auflage freigelassenen Bereich aus dem Schleifstück herausgeführt ist.According to the invention, this object is achieved in that the support only partially covers the side surface of the carbon grinder and that the power supply line on the same side surface in its area left free from the support is led out of the contact strip.

Bei dem erfindungsgemäß ausgebildeten Kohleschleifstück kann es nicht vorkommen, daß sich Teile des zweiten, schlechter leitenden Kohlewerkstoffs herstellungsbedingt zwischen der Stromzuleitung und dem ersten Kohlewerkstoff einlagern.In the case of the carbon grinder piece designed according to the invention, it cannot happen that parts of the second, poorly conductive carbon material become embedded between the power supply line and the first carbon material due to the manufacturing process.

In weiterer bevorzugter Ausbildung der Erfindung besteht die Auflage aus einem Vorpreßling aus dem zweiten Kohlewerkstoff, der mit dem Grundkörper aus dem ersten Kohlewerkstoff unlösbar preßverbunden ist.In a further preferred embodiment of the invention, the support consists of a pre-pressed part made of the second carbon material, which is non-releasably press-connected to the base body made of the first carbon material.

Eine Ausführungsform der Erfindung wird anhand der beigefügten Zeichnung erläutert. Es zeigt:An embodiment of the invention is explained with reference to the accompanying drawing. It shows:

Fig. 1 eine perspektivische Ansicht eines erfindungsgemäßen Kohleschleifstücks.Fig. 1 is a perspective view of a carbon grinder according to the invention.

Fig. 2 und 3 schematische Darstellungen der Herstellung des Kohleschleifstücks.2 and 3 are schematic representations of the manufacture of the carbon grinder.

Gemäß Fig. 1 ist das Kohleschleifstück 1 beispielsweise quaderförmig und trägt auf seiner einen Seitenfläche 3 eine in das Kohleschleifstück eingebettete Auflage 2, die jedoch nur einen Teil dieser Seitenfläche bedeckt, so daß eine Bereich 3a der Seitenfläche freigelassen wird. In diesem Bereich 3a sind zwei Stromzuleitungskabel 4, die in das Kohleschleifstück 1 eingebettet und mit ihm verpreßt sind, aus dem Kohleschleifstück herausgeführt. Die zu der Seitenfläche 3 rechtwinklige Schmalseite 5 stellt im Betrieb die z.B. an einem Kommutatorring anliegende Lauffläche des Kohleschleifstücks dar.1, the carbon grinder 1 is, for example, cuboid and carries on its one side surface 3 a support 2 embedded in the carbon grinder, which however only covers part of this side surface, so that an area 3a of the side surface is left free becomes. In this area 3a, two power supply cables 4, which are embedded in the carbon grinder 1 and pressed with it, are led out of the carbon grinder. The narrow side 5, which is at right angles to the side surface 3, represents the running surface of the carbon grinder, for example, which rests against a commutator ring.

Die Herstellung des erfindungsgemäßen Kohleschleifstücks kann gemäß Fig. 2 und 3 wie folgt durchgeführt werden: In einer separaten Form (nicht dargestellt) wird die Auflage 2 in Form eines flachquaderförmigen Vorpreßlings vorgepreßt, und zwar aus einem Kohlewerkstoff geringerer Leitfähigkeit, z.B. aus reinem Graphit. Anschließend wird die eigentliche Formmatritze 7 für das Kohleschleifstück mit dem ersten Kohlewerkstoff 1′ gefüllt, der ein Werkstoff mit hoher Leitfähigkeit ist, insbesondere eine Mischung aus Graphit und Metallpulver. Auf die Oberfläche der eingefüllten Pulverschicht 1′ wird der Vorpreßling aufgelegt. Auf diese Anordnung wird dann von oben ein Stempel 9 abgesenkt, der Öffnungen zur Aufnahme der Stromzuleitungskabel 4 enthält. Durch Abwärtsbewegung des Stempels 9 werden einerseits die Enden der Stromzuleitungskabel 4 zeitlich neben dem Vorpreßling 2 in die Pulvermasse 1′ eingedrückt und im gleichen Arbeitsgang dann die Pulvermasse 1′ zusammen mit dem Vorpreßling 2 zusammengedrückt und fertiggepreßt, so daß das Kohleschleifstück 1 als Verbundkörper entsteht.2 and 3 can be carried out as follows: In a separate mold (not shown), the support 2 is pre-pressed in the form of a flat cuboid preform, namely from a carbon material of lower conductivity, for example from pure graphite. Then the actual die 7 for the carbon grinder is filled with the first carbon material 1 ', which is a material with high conductivity, in particular a mixture of graphite and metal powder. The preform is placed on the surface of the filled powder layer 1 '. A stamp 9, which contains openings for receiving the power supply cable 4, is then lowered onto this arrangement from above. By moving the plunger 9 down on the one hand the ends of the power supply cable 4 are pressed in time next to the preform 2 in the powder mass 1 'and then in the same operation the powder mass 1' together with the preform 2 and pressed pressed so that the carbon grinder 1 is formed as a composite body.

Claims (3)

  1. A carbon shoe with a base member (1) of a first carbon material, which on one end surface is provided with a contact (2) composed of a second carbon material, wherein the first and second carbon materials have different conductivity, and with at least one power supply lead (4) embedded in the carbon shoe, characterised in that the power supply lead (4) emerges from the end surface of the base member (1) provided with the contact (2) in a region of the end surface not covered by the contact (2), and in that the power supply lead (4) and the contact (2) are bonded with the base member (1) by compression.
  2. A carbon shoe according to Claim 1, characterised in that the contact (2) comprises a pressed preform which is compression-bonded to the base member (1).
  3. A method of producing a carbon shoe according to Claim 1 or 2, characterised in that, in a first step, the contact (2) is formed by first pressing from the second carbon material, in that subsequently a bottom die (7) is filled with the first carbon material in a powder composition (1′), the preformed pressed contact (2) is placed on the surface of the powder composition and, subsequently, the powder composition (1′) and the contact (2) are compressed by a die (9) and are bonded together and, at the same time, the ends of the power supply leads (4) are pressed into the powder composition (1′).
EP90900814A 1988-12-20 1989-12-20 Graphite trolley shoe and process for its manufacture Expired - Lifetime EP0449909B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90900814T ATE88039T1 (en) 1988-12-20 1989-12-20 CARBON GRINDING PIECE AND PROCESS FOR ITS MANUFACTURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8815801U 1988-12-20
DE8815801U DE8815801U1 (en) 1988-12-20 1988-12-20 Carbon contact piece

Publications (2)

Publication Number Publication Date
EP0449909A1 EP0449909A1 (en) 1991-10-09
EP0449909B1 true EP0449909B1 (en) 1993-04-07

Family

ID=6830966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90900814A Expired - Lifetime EP0449909B1 (en) 1988-12-20 1989-12-20 Graphite trolley shoe and process for its manufacture

Country Status (7)

Country Link
US (1) US5285126A (en)
EP (1) EP0449909B1 (en)
JP (1) JPH04500580A (en)
AT (1) ATE88039T1 (en)
DE (2) DE8815801U1 (en)
ES (1) ES2040108T3 (en)
WO (1) WO1990007211A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4430745B4 (en) * 1993-09-02 2006-06-14 Carbone Lorraine Applications Electriques Method for producing multilayer sliding contacts

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8815801U1 (en) * 1988-12-20 1989-02-23 Hoffmann & Co. Elektrokohle KG, Steeg Carbon contact piece
US5387832A (en) * 1991-04-25 1995-02-07 Tokyo Electric Co., Ltd. Brush and commutator motor having brush device using the same
US5387831A (en) * 1993-05-27 1995-02-07 Yang; Tai-Her Low circulation loss compound brush
EP1128496B1 (en) * 2000-02-22 2008-12-10 Denso Corporation Method of manufacturing of a multi-layered brush of rotary electric machine
JP3511513B2 (en) 2001-05-10 2004-03-29 三菱電機株式会社 Brush equipment
GB0303752D0 (en) * 2003-02-18 2003-03-26 Morgan Crucible Co Composite electrical brush construction

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US672449A (en) * 1900-08-31 1901-04-23 Emmet T Bowen Electrical conductor.
US701369A (en) * 1901-11-05 1902-06-03 Eastern Carbon Works Carbon brush and process of making same.
GB556465A (en) * 1942-03-02 1943-10-06 Morgan Crucible Co Improvements in or relating to electric current collecting brushes or the like
CH272683A (en) * 1947-12-24 1950-12-31 Morgan Crucible Company Limite Sandwich broom for electric machine.
DE1261589B (en) * 1966-05-17 1968-02-22 Sigri Elektrographit Gmbh Commutator brushes made of charcoal or electrographite and process for their manufacture
US3445704A (en) * 1967-12-26 1969-05-20 Morganite Inc Current collecting triple wafer brush assembly
FR2339263A1 (en) * 1976-01-21 1977-08-19 Lorraine Carbone BRUSHES WITH IMPROVED PROPERTIES FOR ELECTRIC MACHINES
DE2838144A1 (en) * 1978-09-01 1980-03-13 Ringsdorff Werke Gmbh Carbon brush for rotating machine - has felt layer of given thickness on trailing edge to increase commutation capacity
DE8815801U1 (en) * 1988-12-20 1989-02-23 Hoffmann & Co. Elektrokohle KG, Steeg Carbon contact piece
JPH0371582A (en) * 1989-08-10 1991-03-27 Fuji Electric Co Ltd Brush
JP2981498B2 (en) * 1989-11-27 1999-11-22 三菱製紙株式会社 Emulsifier for microcapsule, microcapsule using the emulsifier, method for producing the same, and carbonless pressure-sensitive copying paper using the microcapsule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4430745B4 (en) * 1993-09-02 2006-06-14 Carbone Lorraine Applications Electriques Method for producing multilayer sliding contacts

Also Published As

Publication number Publication date
ATE88039T1 (en) 1993-04-15
JPH04500580A (en) 1992-01-30
ES2040108T3 (en) 1993-10-01
DE58904027D1 (en) 1993-05-13
DE8815801U1 (en) 1989-02-23
EP0449909A1 (en) 1991-10-09
US5285126A (en) 1994-02-08
WO1990007211A1 (en) 1990-06-28

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