EP0662738A1 - Fabrikationsvorrichtung für die wirtschaftliche Erzeugung von Schliefkontakten mit vorgeschriebener Anisotropie - Google Patents

Fabrikationsvorrichtung für die wirtschaftliche Erzeugung von Schliefkontakten mit vorgeschriebener Anisotropie Download PDF

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Publication number
EP0662738A1
EP0662738A1 EP94420362A EP94420362A EP0662738A1 EP 0662738 A1 EP0662738 A1 EP 0662738A1 EP 94420362 A EP94420362 A EP 94420362A EP 94420362 A EP94420362 A EP 94420362A EP 0662738 A1 EP0662738 A1 EP 0662738A1
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EP
European Patent Office
Prior art keywords
compression
sheath
brush
horizontal
vertical
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.)
Granted
Application number
EP94420362A
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English (en)
French (fr)
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EP0662738B1 (de
Inventor
Horst Siegemund
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.)
Deutsche Carbone AG
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Deutsche Carbone AG
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Filing date
Publication date
Application filed by Deutsche Carbone AG filed Critical Deutsche Carbone AG
Publication of EP0662738A1 publication Critical patent/EP0662738A1/de
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Publication of EP0662738B1 publication Critical patent/EP0662738B1/de
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/12—Manufacture of brushes
    • 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
    • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof

Definitions

  • the invention relates to the manufacture of brushes for electric motors, and more particularly to a device and a method for economical manufacture of brushes with predetermined anisotropy using this device.
  • the invention relates to a direct manufacture of brushes, that is to say a shaping by compression of conductive powders requiring no final machining of the brush, neither to put it at the desired dimensions nor to fix the electrical connection conductor, manufacturing which makes it possible to obtain brushes with predetermined anisotropy.
  • the anisotropy of a broom is known to constitute an essential parameter which conditions its performance of use. It finds its source in the fact that the brushes are generally obtained by compression of powders some of which can have very high form factors (ratio "largest dimension / small dimension"), for example graphite in particles of thin thickness e (5-20 ⁇ m) and very long or wide (100-200 ⁇ m). This results in a certain orientation of the particles with form factor significantly different from one, and therefore, in fine, an anisotropy of both electrical and tribological properties, the particles with high form factor orienting themselves during the compression step. so that the compression axis is on average parallel to the most small dimension e of these particles (or perpendicular to the plane formed by the largest dimensions).
  • the brush is oriented relative to the manifold so that the compression direction of the brush is the tangential direction "t" of the motor manifold.
  • the tangential direction "t" like the other axial directions "a” and radial “r”, are relative to the collector - see figure 8f.
  • the foot of the brush has at least the curvature of the collector, if not other complementary means, to facilitate the running in of the motor.
  • the head of the broom is provided with a means, typically a nipple, a notch or rib, so that the spring pressing on the head remains well centered and does not risk slipping laterally - hence machining of the head in the processes of the prior art.
  • the device for manufacturing brushes comprises a matrix provided with a cavity intended to receive at least one conductive powder to be compressed and at least one punch for compressing said powder, and is characterized in that said matrix is provided with two concurrent sheaths forming said cavity, and oriented at 90 ° relative to each other, one being oriented vertically, and the other horizontally, and in that each of these sheaths is provided with compression means, comprising at least one compression punch, so as to obtain a biaxial compression of said powder.
  • the devices used industrially according to the prior art typically consist of a vertical sheath provided with two punches, a low punch forming with the vertical sheath a cavity, cavity which is then charged, by the free upper orifice, with at least one conductive powder.
  • the uniaxial compression between punches leads, as already indicated, to the formation of an anisotropic brush, with a so-called “laminated” structure, which is used to improve the switching.
  • this device it is impossible to obtain, by compression, a raw broom with, at its head and / or at its foot, a desired geometrical configuration (centering pin for the head, curvature for the foot, etc. ..), and further having a favorable orientation of its laminated structure.
  • the biaxial compression device makes it possible to obtain both the laminated structure favorably oriented and any geometrical configuration whatsoever desired for the head and the foot of the broom, a typical configuration of the foot being a curvature adapted to that of the collector.
  • the biaxial compression device makes it possible to obtain, directly by pressing conductive powder, a raw broom, the head and / or the foot of which has a desired geometric configuration, while retaining the desired orientation of its laminated structure.
  • the desired laminated structure is obtained during the first compression, while the desired geometric configuration is obtained during the second compression.
  • FIG. 1 shows a schematic perspective view of a biaxial compression device (1) according to the invention.
  • This device (1) comprises a matrix (2) in which two concurrent sheaths, a vertical sheath (3) of section Sv (oblique hatching) and a horizontal sheath (4) of section Sh (vertical hatching) intersect at 90 ° in forming a common intersection space (5) of parallelepiped shape.
  • the vertical sheath is provided with two punches: a high punch (6), and a low punch (6 ').
  • the horizontal sheath is provided with two punches: a left punch (7), and a right punch (7 ').
  • the means known in themselves are not shown for actuating the various punches (6, 6 ', 7 and 7').
  • FIGS. 2a to 2d illustrate, in different stages, the operation of the device (1) and represent a section in the vertical plane along the axis A-B of FIG. 1.
  • the top punch (6) has been moved aside, the other punches being positioned to form a cavity which has been loaded with conductive powder to be compressed (9), and of volume Vo.
  • the left punch (7) has a curved profile.
  • Figure 2b shows the first compression step, in the vertical direction using the top (6) and bottom (6 ') punches.
  • FIG. 2c represents the second compression step, in the horizontal direction using the left (7) and right (7 ') punches, which leads to the final shaping of a raw broom (11) of volume Vf .
  • FIG. 2d shows the next step, during which the horizontal punches (7) and (7 ') are separated, so as to allow the recovery of the raw brush (11) - after the vertical punches (6) have been raised and (6 ') and spacing of the top punch (6), (not shown in Figure 2d).
  • FIG. 3 represents a schematic perspective view of a first variant (1a) of the device (1) according to the invention.
  • FIGS. 4a and 4b are sections in the vertical plane along the axis A-B in FIG. 4.
  • FIG. 4b similar to FIG. 2b, shows the first stage of compression, in the vertical direction using the bottom punch (6 '), after a plate (8) has been placed on the upper plane (20 ) of the matrix (2a) and maintained in this position by means not shown.
  • Figure 4c shows a section of the final raw broom (11).
  • Figure 5a is a top view of the device of Figure 3 which illustrates the fact that the horizontal sheath (4) is formed by precision machining so as to ensure a width 1 with high precision ( ⁇ 1 less than 0.02 mm , and preferably less than 0.01 mm).
  • Figure 6 similar to Figures 1 and 3 shows a second modality (1b) of the device (1).
  • the vertical sheath (3) and the horizontal sheath (4) have the shape of an "L".
  • the bottom vertical punch (6 ') has been provided locally with a transverse allowance (16).
  • Figures 7a to 7c similar to Figures 4a to 4c, are sections in a vertical plane along the axis A-B of Figure 6.
  • FIG. 7a similar to Figure 4a, the horizontal punch (7 ') which includes a hollow portion (14), and the bottom vertical punch (6') are positioned to form a cavity which has been loaded with conductive powder to compress (9), and of useful volume Vo. Both the bottom vertical punch (6 ') and the top plate (8) are provided with a transverse allowance (16).
  • Figure 7b shows the device (1b) at the end of the first vertical compression.
  • FIG. 7c represents the raw brush (11) obtained with two lateral grooves (16a) and a stud (14a).
  • Figures 8a to 8f show variants of raw brushes (11), in section along the plane "r-t", obtained according to the invention. These variants, self-explanatory in themselves, relate to the geometrical configuration (Fig 8a, 8b, 8c and 8d).
  • FIG. 8e end of the foot (18) in "wide” cross hatching - end of the head (19) in "tight” cross hatching
  • FIG. 8f represents the directions "a", "r” and "t" relative to the collector (22).
  • FIG. 10a represents on the one hand a biaxial compression device (1a) according to the invention used in monoaxial compression (horizontal punches 7 and 7 ′) in the initial state, to obtain a raw brush according to the prior art, the powder charge (9) of volume Vo which has not yet started to be compressed, the vertical punch (6 ') being kept raised during all of the compression, and on the other hand it represents, in section along the plane "rt" , the raw broom obtained on which the orientation of the particles after compression has been shown diagrammatically.
  • Figures 10b and 10c similar to Figure 10a, correspond to tests lb and lc respectively.
  • the two rough brushes obtained have a "core” made up of particles oriented favorably along the plane "ar” (orientation obtained during the first vertical compression with the punch 6 '), and two ends with the desired geometric shape, at the head (19 ) and at the foot (18), constituted by a layer of thickness E where the particles are oriented in the plane "a-t" (geometric shape obtained during the second horizontal compression, with the punches 7 and 7 ').
  • FIGS. 11a and 11b relate to the brushes of Example 2. They represent sections of brushes according to the "rt" plane, FIG. 11a being relative to a brush according to the prior art with homogeneous anisotropy, and FIG. 11b to a broom according to the invention.
  • the "heart” of the brush is formed of particles contained in the plane "a-t", while, on a thickness E of two opposite faces of the brush, the particles are oriented according to the plane " ra ".
  • FIG. 12 represents, in section along the plane "rt", a brush of example 3 according to the invention, the initial powder charge (9) being different for the head (19) (represented by crosses) and for the rest of the broom.
  • Figures 13a to 13c and 14a to 14b show devices intended to form brushes with trapezoidal section.
  • the horizontal punches (7,7 ') are of trapezoidal section, the parallel sides of this trapezoidal section being located in the horizontal plane. Compression in the vertical direction is ensured by the bottom vertical punch (6 '), with rectangular section, and the upper plate (8).
  • Figure 13a is a schematic perspective view, similar to Figures 1, 3 and 6, of a device (1c) comprising a matrix (2c) whose horizontal sheath (4) is of trapezoidal section.
  • FIG. 13b represents the so-called common volume (5) which has the shape of a right prism with a trapezoidal base.
  • Figure 13c is a section of the device (1c) of Figure 13a, along a vertical plane passing through AB.
  • Figure 14a is similar to Figure 13a, except that the horizontal sheath (4) has a trapezoidal section whose parallel sides are in the vertical plane. Consequently, the bottom vertical punch (6 ') and the plate upper (8) are provided with inclined parts intended to cooperate with the concurrent sides of said trapezoidal section, as shown in FIG. 14b, which is a section of the device (1d) of FIG. 14a, along a vertical plane and along the direction AB of FIG. 14a.
  • said vertical (3) and horizontal (4) sheaths preferably have respective rectangular, square, or trapezoidal sections S v and S h , which are connected in a common volume (5) preferably resulting , of the orthogonal projection of sections S v and S h - see Figures 1, 3, 6, 14a - Figure 13a illustrating the case where the common volume (5) is not, strictly speaking, the result of the orthogonal projection S v and S h sections insofar as the vertical sheath (3) has a constant section S v in the lower part of the die (2c) used to guide the punch (6 '), section which then widens at level of said common volume (5).
  • the common volume (5) is a rectangular parallelepiped when the sections S v and S h are rectangular or square ( Figure 1).
  • This volume (5) is a right prism with a trapezoidal base when one of the sections S v or S h is a trapezoid ( Figure 13b).
  • the means of compression in the vertical direction is formed by said vertical sheath (3 ) provided at its lower part with a compression punch (6 ') and at its upper part of a removable plate (8) with a surface greater than the section S v of the vertical sheath.
  • This plate (8) is moved during the loading phase of the cavity with said powder to be compressed (9) occupying a useful volume Vo of the "T" shaped cavity, then, after loading of said powder, it is placed on the upper surface (20) of the matrix and kept pressed against it using means known in themselves and not shown (typically one or more hydraulic cylinders exerting a pressure greater than that exerted by the bottom vertical punch (6 ')).
  • the compression means in the vertical direction is formed by said vertical sheath (3) provided at its lower part with a punch compression (6 ') and at its upper part of another compression punch (6), so as to be able to perform along the vertical axis a double effect compression.
  • the invention also provides two methods.
  • a first modality relating to horizontal compression as shown in FIGS. 1, 2a to 2d, 3, 4a to 4b, 5a and 5b, said horizontal sheath (4) is provided with two compression punches, a left punch (7) , and a straight punch (7 '), so that double-effect compression can be effected along the horizontal axis.
  • double-effect compression is very useful for giving the head and foot of the broom a particular geometric configuration, for example that of the brooms in FIGS. 8c and 8d.
  • said horizontal sheath (4) is, at one end, provided with a single punch (7 '), the other end being formed by a portion of one of the walls of the vertical sheath (3).
  • the useful volume cavity Vo containing the powder to be compressed (9) has the shape of an "L” and the device shown in Figures 6, 7a to 7b comprises only two punches. According to the invention, one could also replace the upper plate (8) with a punch (6), and thus obtain a useful volume cavity Vo containing the powder to be compressed (9) in the shape of an inverted "T".
  • said removable upper plate (8) not only serves to close the upper part of the vertical sheath (3), but also forms at the same time the upper wall of said horizontal sheath (4).
  • the advantage of this modality thus appears very clearly, since it suffices for a simple machining to form a horizontal sheath (4) open at its upper part, and having precise dimensions - in particular a precise width 1. See Figures 3 and 5a.
  • the devices according to the invention should advantageously include a differentiated control of the compression means in each direction: said means for compressing a sheath (3 or 4) are used under displacement control, while said means for compressing the other sheath (4 or 3) are used under control of the pressure exerted, the compression means under displacement control or under pressure control being known per se.
  • said two control means are represented symbolically in FIG. 5b.
  • said means for compressing said vertical sheath (3) are placed in works under displacement control, while said means for compressing said horizontal sheath (4) are implemented under control of the pressure exerted.
  • compression under displacement control freezes the section of the brush and creates the desired anisotropy
  • compression under pressure control forms on the one hand the geometric configuration of the head and foot of the brush, but also constitutes the additional pressure necessary for the cohesion and mechanical strength of the brush.
  • the compression means of the vertical sheath (3) are used, under displacement control, and, under pressure control, the compression means of the horizontal sheath (4).
  • displacement control is meant that, after setting in motion of the means for compressing the vertical sheath, these stop as soon as the punch (s) has (have) reached a certain dimension z ( alignment in particular of the punch 6 'with the edges of the horizontal sheath 4 - see figure 5b).
  • pressure control is meant that, after setting in motion of the means for compressing the horizontal sheath, they stop as soon as a certain predetermined pressure is reached.
  • (V o -V i ) / (V o -V f ) deviates from 1.
  • T i / T t is close to 1 or that T c / T t is greater than 0.5 to obtain the desired anisotropy.
  • T i / T t close to 1 (typically between 0.7 and 0.95), so as to simultaneously obtain the laminated structure and the appropriate section of the brush sought, the compression under control pressure (T c / T t between 0.05 and 0.3) used to obtain the desired geometric configuration of the head and foot of the brush.
  • T c / T t between 0.05 and 0.3
  • the means of compression of the horizontal sheath (4) are therefore generally used, as illustrated in FIGS. 8c and 8d, to obtain the desired shape of the head (stud (14a), hole (15) ...) and / or foot of the brush (curvature adapted to that of the collector, striated contact face).
  • any compression means according to the invention can be used to incorporate the electrical connection conductor, or for that matter any other object which must be at least partly embedded in the powder to be compressed.
  • the invention also makes it possible to obtain brushes with differential local density. It is particularly advantageous to have brushes whose head has a "high" density, because this is favorable to the solidity of the assembly of said conductor and the block of compressed powder, and brushes whose foot can have a density " low "so as to facilitate and accelerate the running-in phase of the engine.
  • high or low density is meant not an absolute density value, but a deviation from the average density d m of the brush.
  • a “high” density typically corresponds to a density between 1.05.d m and 1.08.d m .
  • a “low” density typically corresponds to a density between 0.85.d m and 0.95.d m .
  • Such a brush can be obtained with a method using the device (1b) of FIG. 6 in which said horizontal sheath (4) is, at one end, provided with a single punch (7 '), the other end being formed by a portion of one of the walls of the vertical sheath (3).
  • said initial initial compression ratio T i is chosen at least equal to 2, and less than 0, 9 T t .
  • the Applicant has observed that with a relatively high rate of first compression under displacement control, the second compression, which, as already mentioned, allows the geometric configuration of the head and the foot of the broom, also allows, thanks to a compression with a single punch (7 ') of the compressed powder block (10), to obtain a raw brush (11) more dense on the side of the second compression punch than on the opposite side, as shown diagrammatically in FIG. 8e (hatching tighter at the "head" end (19) than at the other "foot” end (18)).
  • a third object according to the invention consists of the brushes produced using the devices and methods according to the invention.
  • the brushes obtained using the devices and according to the methods of the invention are characterized by the heterogeneity of their anisotropy, between the "heart" of the brush and two of the 6 faces of the brush (on a thickness E, of the order of a few millimeters at most): the orientation of the particles in the "core" of the broom is 90 ° from the orientation of the particles in two of the 6 faces of the broom.
  • the particles of the "heart” are oriented in the "ar” plane
  • the particles of the head (19) and the foot (18) are oriented in the "a-t” plane. See Figures 10b and 10c for example.
  • the head (19) and the foot (18) are provided with geometric means (curvature, nipples, holes, etc.) adapted to the use of these brushes, and obtained, according to the invention, directly during the biaxial compression stage.
  • Brushes for auxiliary electric motors of cars have been manufactured - typically for window regulator motor using the biaxial compression device according to the invention (la) shown in FIGS. 3, 4a to 4c, from conventional powders comprising particles of graphite in the form of flakes, particles of large dimensions (from 30 to 300 ⁇ m), but of small thickness (less than 20 ⁇ m). These brushes have the following dimensions: 5mm x 5 mm x 11 mm Figure 9 shows different views of these brushes.
  • the foot (18) of these brushes has a curvature and the curved contact surface (13) has oblique grooves (23).
  • the head (19) of these brushes has a hole (15) intended for centering the spring of the brush (not shown). This foot (18) and this head (19) are obtained thanks to the corresponding geometric shape of the left (7) and right (7 ') horizontal punches of the biaxial compression device (1a).
  • FIGS. 10a to 10c Three series of comparative tests were carried out, denoted 1a, 1b and 1c. There is shown, respectively in FIGS. 10a to 10c, the configuration of the same volume Vo of the powder charge (9) to be compressed, in order to obtain a raw brush (11) of the same final volume Vf.
  • the brush (11) of test la corresponding to the prior art and comprising only a compression along the horizontal axis, is homogeneous and anisotropic, the particles being oriented in the plane "a-t "perpendicular to the direction of compression Tc along the horizontal axis.
  • the brush (11) of test lb is homogeneous and anisotropic, the particles being oriented in the plane "ar" perpendicular to the direction of compression Ti (according to l 'vertical axis), except over a thickness E of about 2 mm at the ends of the brush, at the head (19) and at the foot (18) where the particles are oriented along the plane "a-t", perpendicular to the direction compression Tc (along the horizontal axis).
  • the results obtained are similar to those of test 1b, except that the thickness E is approximately 1 mm, instead of 2 mm for test 1b.
  • the relative resistivity R has been measured, in the direction "r" (Rr), and in the perpendicular direction "t", for the brushes (2a) and (2b): broom 2a broom 2b Rr / Rt neighbor of 3 neighbor of 1
  • the head (19) which comprises a stud (14a) for centering the spring, is relatively isotropic (represented by crosses in FIG. 12).
  • the wear block (25) of the brush (11) consists essentially of an anisotropic material (particles oriented along the plane "ra"), except at the end (foot (18)) where, on a thickness E of material, the orientation of the particles is in the plane "a-t".
  • this brush is advantageous because it ensures very good electrical contact (low ohmic drop) between the cable (12) and the head of the brush (19).
  • the invention is if not revolution, at least an essential step towards simultaneous control the desired orientation of the particles of the broom, the geometric configuration, in particular of the head and the foot of the broom, and the costs.
  • the multiple figures and examples are there to illustrate, by way of examples, the great richness of the invention.
  • the invention makes it possible to economically manufacture a wide variety of brushes, with the most diverse geometric shapes and anisotropies, so that it constitutes the perfect tool for the brush manufacturer who must constantly improve his products and adapt them to new demands.
EP94420362A 1993-12-23 1994-12-19 Fabrikationsvorrichtung für die wirtschaftliche Erzeugung von Schleifkontakten mit vorgeschriebener Anisotropie Expired - Lifetime EP0662738B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9315769 1993-12-23
FR9315769A FR2714542B1 (fr) 1993-12-23 1993-12-23 Dispositif de fabrication économique de balais à anisotropie prédéterminée et procédé correspondant.

Publications (2)

Publication Number Publication Date
EP0662738A1 true EP0662738A1 (de) 1995-07-12
EP0662738B1 EP0662738B1 (de) 1997-09-17

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EP94420362A Expired - Lifetime EP0662738B1 (de) 1993-12-23 1994-12-19 Fabrikationsvorrichtung für die wirtschaftliche Erzeugung von Schleifkontakten mit vorgeschriebener Anisotropie

Country Status (7)

Country Link
US (1) US5626803A (de)
EP (1) EP0662738B1 (de)
JP (1) JPH07211428A (de)
AT (1) ATE158444T1 (de)
DE (1) DE69405700T2 (de)
ES (1) ES2107160T3 (de)
FR (1) FR2714542B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2911728A1 (fr) * 2007-01-24 2008-07-25 Valeo Equip Electr Moteur Balai pour machine electrique tournante et machine comportant un tel balai.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209199A1 (de) * 2002-03-04 2003-10-02 Schunk Kohlenstofftechnik Gmbh Verfahren zur Herstellung einer Mehrschicht-Kohlebürste
DE202007003159U1 (de) 2007-03-01 2007-05-10 Schunk Kohlenstofftechnik Gmbh Kontaktstück
DE102012010481A1 (de) * 2012-05-26 2013-11-28 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Verfahren zur Herstellung einer Bürste eines Kommutatormotors
JP7438614B2 (ja) * 2020-12-28 2024-02-27 クアーズテック合同会社 電機用摺動ブラシ及びその製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE123712C (de) *
US2310108A (en) * 1940-11-23 1943-02-02 Westinghouse Electric & Mfg Co Carbon brush construction
US3906624A (en) * 1973-03-07 1975-09-23 Fuji Carbon Manufacturing Co L Electrical machine brush and method and apparatus for manufacturing the same
FR2445045A1 (fr) * 1978-12-23 1980-07-18 Bosch Gmbh Robert Machine electrique notamment moteur electrique comportant un collecteur et au moins un balai frotteur applique contre celui-ci et procede de fabrication du balai frotteur
DE9306573U1 (de) * 1992-05-04 1993-06-24 Le Carbone Lorraine, Courbevoie, Hauts-De-Seine, Fr

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE123712C (de) *
US2310108A (en) * 1940-11-23 1943-02-02 Westinghouse Electric & Mfg Co Carbon brush construction
US3906624A (en) * 1973-03-07 1975-09-23 Fuji Carbon Manufacturing Co L Electrical machine brush and method and apparatus for manufacturing the same
FR2445045A1 (fr) * 1978-12-23 1980-07-18 Bosch Gmbh Robert Machine electrique notamment moteur electrique comportant un collecteur et au moins un balai frotteur applique contre celui-ci et procede de fabrication du balai frotteur
DE9306573U1 (de) * 1992-05-04 1993-06-24 Le Carbone Lorraine, Courbevoie, Hauts-De-Seine, Fr

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2911728A1 (fr) * 2007-01-24 2008-07-25 Valeo Equip Electr Moteur Balai pour machine electrique tournante et machine comportant un tel balai.

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Publication number Publication date
FR2714542B1 (fr) 1996-02-02
ATE158444T1 (de) 1997-10-15
DE69405700T2 (de) 1998-02-19
FR2714542A1 (fr) 1995-06-30
JPH07211428A (ja) 1995-08-11
DE69405700D1 (de) 1997-10-23
US5626803A (en) 1997-05-06
ES2107160T3 (es) 1997-11-16
EP0662738B1 (de) 1997-09-17

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