EP1662638B1 - Carbon brush - Google Patents

Carbon brush Download PDF

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Publication number
EP1662638B1
EP1662638B1 EP03818580A EP03818580A EP1662638B1 EP 1662638 B1 EP1662638 B1 EP 1662638B1 EP 03818580 A EP03818580 A EP 03818580A EP 03818580 A EP03818580 A EP 03818580A EP 1662638 B1 EP1662638 B1 EP 1662638B1
Authority
EP
European Patent Office
Prior art keywords
particle size
graphite particles
graphite
carbon brush
particles
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
EP03818580A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1662638A4 (en
EP1662638A1 (en
Inventor
Hidenori c/o Totankako Co. Ltd. SHIRAKAWA
Yoshikazu c/o Totankako Co. Ltd. KAGAWA
Takashi c/o Totankako Co. Ltd. MAEDA
Takahiro c/o TOTANKAKO CO. LTD. SAKODA
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.)
Toyo Tanso Co Ltd
Original Assignee
Toyo Tanso Co Ltd
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 Toyo Tanso Co Ltd filed Critical Toyo Tanso Co Ltd
Priority to SI200331559T priority Critical patent/SI1662638T1/sl
Publication of EP1662638A1 publication Critical patent/EP1662638A1/en
Publication of EP1662638A4 publication Critical patent/EP1662638A4/en
Application granted granted Critical
Publication of EP1662638B1 publication Critical patent/EP1662638B1/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
    • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
    • 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

Definitions

  • the present invention concerns a carbon brush which uses a graphite particle filler and which is for use in electric machines and, particularly, it relates to a carbon brush which prevents desorption of particles of the filler during use.
  • carbon brushes have been known.
  • they include those disclosed in JP-A No. 2000-197315 .
  • Those in this document use artificial graphite particles or natural graphite particles, etc. as the filler.
  • the artificial graphite particles, natural graphite particles, etc. used as the filler have been controlled loosely during use, for example, distinguishing between fine powder and coarse powder, the filler structures of the formed carbon brushes have not been uniform, but those not having uniform particle size have been predominant.
  • the present inventors have made an earnest study, as a result, have found that use of the graphite particles for forming a filler of a controlled grain size distribution is extremely important for extending the life of the carbon brush, and have accomplished the invention. That is, when graphite particles are measured forming the filler by a laser diffraction method, the carbon brush according to the invention has a grain size distribution in which the accumulated value of graphite particles with a grain size of 5 ⁇ m or less is 10% or less that of all the graphite particles.
  • the distribution of particle diameters is controlled so that the accumulated value of graphite particles with a grain size of 5 ⁇ m or less is 10% or less and, preferably, 5% that of all the graphite particles or less, and further, the accumulated value of graphite particles with a particle size of 100 ⁇ m or more is 10% or less, that from 10 to 40 ⁇ m is 60% or more, and that from 12 to 20 ⁇ m is 40% or more of the whole.
  • the principle of the laser diffraction method will here be described.
  • a laser light monochromatic light, parallel beam
  • a spatial distribution pattern of light intensity of diffracted and scattered lights is formed.
  • the distribution pattern of light intensity is detected by a sensor.
  • the distribution pattern of light intensity changes depending on the size of particles.
  • the distribution pattern of light intensity formed from the group of particles is an overlap of diffracted and scattered lights from respective particles.
  • the overlapped distribution pattern of light intensity can be detected and the size of the particles and the ratio of them contained in the group of sample particles can be calculated from this data of the distribution pattern of light intensity.
  • distribution of the grain size can be obtained.
  • a graph as shown in Fig. 1 can be obtained.
  • the abscissa indicates the particle size ( ⁇ m) (logarithmic expression) and the ordinate indicates relative amount of particles (%).
  • the accumulated value of graphite particles with the particle size from 10 to 40 ⁇ m in the particle size distribution resulting from measurement of graphite particles by a laser diffraction method in Fig. 1 means the ratio of the area of the hatched portion (portion corresponding to the particle size of from 10 to 40 ⁇ m) to the area surrounded by the particle size distribution line and the abscissa.
  • graphite particles of artificial graphite or natural graphite can be used. Further, they may be a mixture thereof.
  • the resin for bonding the particles of the graphite particles epoxy resin, phenol resin and various thermosetting resin obtained by modifying them, etc. can be used.
  • the amount of resin used is preferably from 10 to 40%.
  • thermosetting resin for use as the binder of the graphite particles was molded into a predetermined shape and heat treated at a temperature of 150 to 250°C at which the resin is cured to prepare a carbon brush.
  • a solid lubricant such as molybdenum disulfide, tungsten disulfide or boron nitride can also be added in addition to the filler.
  • the invention can be applied not only to the thermosetting carbon brush described above but also to various kinds of carbon brushes referred to as a carbon graphite type or metallic graphite type, formed by kneading with a phenol resin or pitch and firing, whereby similar effects can be obtained.
  • SALD-2000A As a grain size distribution measuring apparatus of laser diffraction type, SALD-2000A manufactured by Shimazu Seisakusho Co. was used. This was used also in the subsequent examples and comparative examples.
  • the particle size distribution calculated from measurement of graphite particles forming a filler by a laser diffraction method was adjusted so as to form a graphite particle filler in which the accumulated value of graphite particles with the particle size of 5 ⁇ m or less was 30% and the accumulated value of graphite particles with the particle size of 100 ⁇ m or more was 10%, and 25% by weight of a general-purpose epoxy resin as a binder was blended and kneaded. After pulverizing the kneaded product so that particles of 63 ⁇ m or less were about 50%, it was molded at 100 MPa to obtain a carbon brush.
  • the particle size distribution calculated from measurement of graphite particles forming a filler by a laser diffraction method was adjusted so as to form a graphite particle filler in which the accumulated value of graphite particles with the particle size of 5 ⁇ m or less was 40%, the accumulated value of graphite particles with the particle size of 100 ⁇ m or more was 15%, and the accumulated value of graphite particles with the particle size from 10 to 40 ⁇ m was 55%, and 25% by weight of a general-purpose epoxy resin as a binder was blended and kneaded. After pulverizing the kneaded product so that particles of 63 ⁇ m or less were about 50%, they were molded at 100 MPa to obtain a carbon brush.
  • FIG. 3 collectively shows the characteristics of each of the carbon brushes.
  • the working life of the carbon brush of Example 2 in which the accumulated value of graphite particles with a particle size of 5 ⁇ m or less was 5% and the accumulated value of graphite particles with a particle size of 100 ⁇ m or more was 10% in the particle size distribution calculated from measurement of the graphite particles forming a filler by a laser diffraction method is extended by about twice that of the not controlled carbon brush in Comparative Example 2.
  • the invention can provide a carbon brush with greatly extended working life compared with existent products.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Battery Electrode And Active Subsutance (AREA)
EP03818580A 2003-09-05 2003-09-05 Carbon brush Expired - Lifetime EP1662638B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200331559T SI1662638T1 (sl) 2003-09-05 2003-09-05 Krtača iz ogljika

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/011366 WO2005025034A1 (ja) 2003-09-05 2003-09-05 カーボンブラシ

Publications (3)

Publication Number Publication Date
EP1662638A1 EP1662638A1 (en) 2006-05-31
EP1662638A4 EP1662638A4 (en) 2006-12-27
EP1662638B1 true EP1662638B1 (en) 2009-01-07

Family

ID=34260141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03818580A Expired - Lifetime EP1662638B1 (en) 2003-09-05 2003-09-05 Carbon brush

Country Status (6)

Country Link
EP (1) EP1662638B1 (zh)
CN (1) CN1839529A (zh)
AT (1) ATE420477T1 (zh)
DE (1) DE60325785D1 (zh)
SI (1) SI1662638T1 (zh)
WO (1) WO2005025034A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1784371B1 (en) 2004-08-02 2014-05-21 Asmo Co., Ltd. Carbon brush and rotating electrical machine
WO2007073793A1 (en) * 2005-12-24 2007-07-05 Pyongyang Technical Trading Centre Flexible natural graphite material and flexible manufacturing method (process) and use thereof
DE102014116114A1 (de) * 2014-11-05 2016-05-12 Schunk Kohlenstofftechnik Gmbh Mehrschicht-Kohlebürste und Herstellung einer solchen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03270660A (ja) * 1990-03-16 1991-12-02 Mabuchi Motor Co Ltd 小型モータにおけるカーボン・ブラシとその製造方法
JP2641695B2 (ja) * 1993-12-28 1997-08-20 マンドー マシネリー コーポレーション 金属黒鉛質ブラシの製造方法
CA2163899C (en) * 1994-04-08 2007-09-18 Atsuo Omaru Non-aqueous electrolyte secondary battery
JP2001327127A (ja) * 2000-05-17 2001-11-22 Toshiba Ceramics Co Ltd 銅カーボン質ブラシおよびその製造方法
JP2002080922A (ja) * 2000-09-07 2002-03-22 Mitsubishi Materials Corp 耐摩耗性のすぐれたＣｕ−黒鉛系焼結材製摺動集電材
JP3797662B2 (ja) * 2002-01-30 2006-07-19 トライス株式会社 銅黒鉛質ブラシ

Also Published As

Publication number Publication date
WO2005025034A1 (ja) 2005-03-17
EP1662638A4 (en) 2006-12-27
CN1839529A (zh) 2006-09-27
EP1662638A1 (en) 2006-05-31
ATE420477T1 (de) 2009-01-15
DE60325785D1 (de) 2009-02-26
SI1662638T1 (sl) 2009-06-30

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