JPH0488853A - Carbon brush in small-sized motor and its manufacture - Google Patents
Carbon brush in small-sized motor and its manufactureInfo
- Publication number
- JPH0488853A JPH0488853A JP20285890A JP20285890A JPH0488853A JP H0488853 A JPH0488853 A JP H0488853A JP 20285890 A JP20285890 A JP 20285890A JP 20285890 A JP20285890 A JP 20285890A JP H0488853 A JPH0488853 A JP H0488853A
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- silver
- copper
- cover layer
- carbon brush
- 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.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052802 copper Inorganic materials 0.000 claims abstract description 37
- 239000010949 copper Substances 0.000 claims abstract description 37
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052709 silver Inorganic materials 0.000 claims abstract description 32
- 239000004332 silver Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 26
- 239000010439 graphite Substances 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000007747 plating Methods 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000011247 coating layer Substances 0.000 claims description 44
- 238000010304 firing Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 3
- 239000007770 graphite material Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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
- H01R39/26—Solid sliding contacts, e.g. carbon brush
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Motor Or Generator Current Collectors (AREA)
- Manufacture Of Motors, Generators (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
永久磁石界磁を有する小型モータに用いるカーボン・ブ
ラシに関し、
酸化特性を改善することにより、電気接触抵抗特性の向
上と耐摩耗性の向上とを図るようにしたカーボン ブラ
シを提供することを目的とし、黒鉛原料の粉末粒子に対
して銅被覆層と銀被覆層とからなる２層金属被覆層を形
成した上で、加圧成形、焼成して構成する。[Detailed Description of the Invention] [Summary] Regarding carbon brushes used in small motors having a permanent magnet field, this invention aims to improve electrical contact resistance characteristics and wear resistance by improving oxidation characteristics. The purpose of the present invention is to provide a carbon brush made of graphite material, which is constructed by forming a two-layer metal coating layer consisting of a copper coating layer and a silver coating layer on powder particles of graphite raw material, and then press-molding and firing. .
［産業上の利用分野］
本発明は、小型モータに用いるカーボン・ブラシ、特に
永久磁石界磁を有する小型モータに用いるカーボン・ブ
ラシに関する。[Industrial Application Field] The present invention relates to carbon brushes used in small motors, and particularly to carbon brushes used in small motors having a permanent magnet field.
従来、小型モータにおけるカーボン・ブラシとしては、
黒鉛粉末に対してバインダを加え、当該バインダを加え
て固められたものに対して粉砕篩分は処理を行い、必要
に応じて所望の導電性を与えるための金属粉末添加混合
処理を行い、次いで加圧成形処理、焼成処理を行うよう
にして製造されたものが用いられている。なお、上記黒
鉛粉末には灰分が含まれており、当該灰分の含有量が多
くなると、導電性、整流特性等に悪い影響を与えるため
、カーボン・ブラシには、灰分の含有量が約１．５％程
度以下の黒鉛粉末が通常用いられている。Conventionally, carbon brushes in small motors are
A binder is added to the graphite powder, and the solidified material with the binder is crushed and sieved, and if necessary, metal powder is added and mixed to give the desired conductivity. Those manufactured by performing pressure molding treatment and firing treatment are used. Note that the graphite powder contains ash, and if the ash content increases, it will have a negative effect on conductivity, rectification characteristics, etc. Therefore, the carbon brush has an ash content of about 1. Graphite powder of about 5% or less is usually used.
また、上記バインダを用いないカーボン・ブラシとして
、いわゆる鍍銅黒鉛ブラシが知られている。当該ｌｉｔ
銅黒鉛ブラシは、第５図に図示されている如く、黒鉛粒
子１１に対して銅メッキを施すことにより銅被覆層１２
を形成した上で、加圧成形即ちバインダを加えることな
く加圧成形し、焼成処理を行うようにして製造される。Furthermore, a so-called copper-plated graphite brush is known as a carbon brush that does not use the above-mentioned binder. The lit
As shown in FIG. 5, the copper graphite brush has a copper coating layer 12 formed by applying copper plating to graphite particles 11.
After forming, pressure molding is performed, that is, pressure molding is performed without adding a binder, and a firing process is performed.
上記ｗ！１ｆ！黒鉛ブラシは、組成的な均一性が同上し
、電気固有抵抗値が低減すると共に、耐摩耗性の同上を
図ることが可能となると言う特徴をそなえている。Above lol! 1f! Graphite brushes have the characteristics of having the same compositional uniformity, reducing the electrical resistivity value, and making it possible to achieve the same abrasion resistance.
しかしながら、高温環境および高電流の条件のもとでは
、上記銅被覆層の酸化現象が発生し、その結果、整流子
に対する接触抵抗が増大すると共に、耐摩耗性が低下す
るという非所望な問題があった。However, under high temperature environment and high current conditions, the copper coating layer oxidizes, resulting in undesirable problems such as increased contact resistance to the commutator and decreased wear resistance. there were.
本発明は、電気接触抵抗特性の向上および耐摩耗性の向
上を図るようにしたカーボン・ブラシを提供することを
目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a carbon brush with improved electrical contact resistance characteristics and wear resistance.
第１図（Ａ） （Ｂ） （Ｃ）は本発明の原理説明図を
示し、第１図（Ａ）は原理構成図、第１図（Ｂ）は製造
工程説明図、第１図（Ｃ）は第１図（Ｂ）図示銀メッキ
処理工程により銀被覆層が形成された黒鉛粉末の断面図
を示す。 図中の符号ｌは整流子１２は整流子片、３は
回転軸、４はカーボン・ブラシ、５はブラシ弾性体、１
３は銀被覆層を表し、その他の符号は第５図図示符号に
対応している。1(A), 1(B), and 1(C) show diagrams explaining the principle of the present invention, FIG. 1(A) is a diagram illustrating the principle configuration, FIG. ) shows a cross-sectional view of graphite powder on which a silver coating layer has been formed by the illustrated silver plating process in FIG. 1(B). In the figure, the symbol l indicates the commutator 12, the commutator piece, 3 the rotating shaft, 4 the carbon brush, 5 the brush elastic body, 1
3 represents a silver coating layer, and the other symbols correspond to the symbols shown in FIG.
また、第１図（Ｂ）において、２０は黒鉛原料、２１は
黒鉛粒子１１に対して例えば公知の無電解メッキ法によ
り銅被覆層１２を形成する銅メッキ処理工程２２は上記
銅被覆層１２上に銀被覆層１３を形成する銀メンキ処理
工程、２３は上記銀被覆層が形成された黒鉛粉末を加圧
成形する加圧成形工程、２４は加圧成形工程２３を経て
成形された加圧成形物を焼成する焼成工程を表している
。In FIG. 1(B), 20 is a graphite raw material, and 21 is a copper plating process 22 in which a copper coating layer 12 is formed on the graphite particles 11 by, for example, a known electroless plating method, on the copper coating layer 12. 23 is a pressure molding process in which the graphite powder on which the silver coating layer is formed is pressure molded; 24 is a pressure molding process formed through the pressure molding process 23; It represents the firing process of firing something.
カーボン・ブラシ４は、導電性のブラシ弾性体５によっ
て挟持され、整流子片２．２．２上を摺動するように支
持される。カーボン・ブラシ４は、図示斜視図として示
すＡ−１図示の如く、例えば凸字形状に焼成されており
、凸字形状の頭部が上記ブラシ弾性体５によって挟持さ
れている。そして、凸字形状の底辺に相当する面に多少
の湾曲面が形成されていて、当該湾曲面が整流子片２上
を摺動する。The carbon brush 4 is held between conductive brush elastic bodies 5 and supported so as to slide on the commutator bar 2.2.2. As shown in the perspective view A-1, the carbon brush 4 is fired into a convex shape, for example, and the convex head is held between the brush elastic bodies 5. A somewhat curved surface is formed on the surface corresponding to the base of the convex shape, and the curved surface slides on the commutator piece 2.
上記カーボン・ブラシ４は、第１図（８）図示の如く、
黒鉛原料２０に対して、銅メンキ処理工程２】と、銀メ
ッキ処理工程２２と、加圧成形工程２３と、焼成工程２
４とを実行することによって製造される。The carbon brush 4 is, as shown in FIG. 1 (8),
The graphite raw material 20 is subjected to a copper coating process 2], a silver plating process 22, a pressure forming process 23, and a firing process 2.
4.
黒鉛粒子に対して銅メンキを施して製造した鍍銅黒鉛ブ
ラシ自体は、従来の技術の欄において記述した如く公知
であり、本発明の特徴は、銅被覆層１２上に銀被覆層１
３が形成されているため高温環境および高電流の条件の
もとでも、上記銅被覆層１２の酸化現象の発生が抑制さ
れ、その結果、整流子に対する電気接触抵抗特性の向上
および耐摩耗性の向上を図ることができることが、後述
する実験結果からも明らかになった。Coated graphite brushes produced by applying copper coating to graphite particles are known per se as described in the prior art section, and the feature of the present invention is that a silver coating layer 1 is formed on a copper coating layer 12
3 is formed, the occurrence of oxidation of the copper coating layer 12 is suppressed even under high temperature environments and high current conditions, and as a result, the electrical contact resistance characteristics and wear resistance of the commutator are improved. It has also become clear from the experimental results described later that improvements can be made.
［実施例〕
本発明のカーボン・ブラシは、第１図（Ｂ）に関連して
前述した如く、黒鉛粒子１１に対して、公知の無電解メ
ッキ法により銅被覆層１２を形成する銅メンキ処理工程
２１．上記銅被覆層１２上に銀被覆層１３を形成する銀
メンキ処理工程２２．上記銅被覆層１２および銀被覆層
１３が形成された黒鉛粉末を加圧成形する加圧成形工程
２３．焼成工程２４を経て製造されたものであり、銅被
覆層１２上に銀被覆層１３が形成されて一〕るため高温
環境および高電流の条件のもとでも、上記銅被覆層１２
の酸化現象発生が抑制され、その結果、整流子に対する
電気接触抵抗特性の向上および耐摩耗性の向上を図るこ
とができることは、第２回に図示されている実験結果か
らも明らかである。なお、第２図は、第３図に図示され
ている如き４種類のカーボン・ブラシが装着された小型
モータにおける整流子に対する接触抵抗（ｍΩ）の経時
的変化を示すグラフである。即ち、Ｎｏ、１は黒鉛粒子
に銅被覆層が形成されたカーボン・ブラシ（ｍ被覆層と
黒鉛粒子との重量比は５０ ： ５０ ＞、 Ｎｏ、
２は黒鉛粒子に銀被覆層が形成されたカーボン・ブラシ
（銀被覆層と黒鉛粒子との重量比は５０ ： ５０ ）
、 Ｎｏ、 ３およびＮｏ、４は本発明のカーボン・ブ
ラシ（Ｎｏ、３における銅被覆層と銀被覆層と黒鉛粒子
との重量比は４０ ： １０ ： ５０゜Ｎｏ、４にお
ける銅被覆層と銀被覆層と黒鉛粒子との重量比は４４：
６：５０）を夫々そなえた小型モータについて、１時間
当たり６０回の測定を行い８時間毎の平均値を示すもの
である。なお、＋° はＮｏ、１． ’口゛はＮｏ、
２． ’◇“はＮｏ、３． ’０はＮｏ、４に対応
している。また、その他の条件として回転数をｌＯ，ｏ
ｏＯｒｐｎ としている。[Example] As described above with reference to FIG. 1(B), the carbon brush of the present invention is manufactured by performing a copper coating process in which a copper coating layer 12 is formed on graphite particles 11 by a known electroless plating method. Step 21. Silver coating step 22 to form a silver coating layer 13 on the copper coating layer 12. Pressure molding step 23 of press-molding the graphite powder on which the copper coating layer 12 and silver coating layer 13 are formed. The silver coating layer 13 is formed on the copper coating layer 12, so even under high temperature environment and high current conditions, the copper coating layer 12
It is clear from the experimental results shown in the second part that the occurrence of the oxidation phenomenon is suppressed, and as a result, the electrical contact resistance characteristics and wear resistance of the commutator can be improved. Note that FIG. 2 is a graph showing changes over time in contact resistance (mΩ) with respect to a commutator in a small motor equipped with four types of carbon brushes as shown in FIG. That is, No. 1 is a carbon brush in which a copper coating layer is formed on graphite particles (the weight ratio of the coating layer to the graphite particles is 50:50>, No.
2 is a carbon brush in which a silver coating layer is formed on graphite particles (weight ratio of silver coating layer and graphite particles is 50:50)
, No. 3 and No. 4 are the carbon brushes of the present invention (the weight ratio of the copper coating layer, silver coating layer, and graphite particles in No. 3 is 40:10:50°). The weight ratio of the coating layer and graphite particles is 44:
6:50) were measured 60 times per hour, and the average value every 8 hours is shown. In addition, +° is No, 1. 'No,'
2. '◇' corresponds to No, 3. '0 corresponds to No, 4. In addition, other conditions include rotation speed lO, o
oOrpn.
更に、第２図（八）図示グラフにおける条件は、電流値
が２アンペア（電流密度： ＩＯＡ／ｃｍ” ）の場合
、第２図（Ｂ）図示グラフにおける条件は、電流値が１
０アンペア（電流密度： ５０Ａ／ａｍ２）の場合であ
る。そして、運転時間１５０時間経過時の摩耗率の測定
も実施し、その結果を上記接触抵抗の１５０時間平均値
と併せて第４図（Ａ） （Ｂ）に示している。Furthermore, the conditions in the illustrated graph in FIG. 2 (8) are when the current value is 2 amperes (current density: IOA/cm"), and the conditions in the illustrated graph in FIG. 2 (B) are when the current value is 1.
This is a case of 0 ampere (current density: 50 A/am2). The wear rate was also measured after 150 hours of operation, and the results are shown in FIGS. 4(A) and 4(B) together with the 150-hour average value of the contact resistance.
なお、第４図（Ａ）は上記第２図（Ａ）図示グラフに対
応し、第４図（Ｂ）は上記第２図（Ｂ）図示グラフに対
応している。Note that FIG. 4(A) corresponds to the graph illustrated in FIG. 2(A) above, and FIG. 4(B) corresponds to the graph illustrated in FIG. 2(B) above.
第２図（Ａ） （Ｂ）ないし第４図（Ａ） （Ｂ）によ
り明らかなように、テストＮｏ、２ないし４はテストＮ
ｏ、１と比較して、接触抵抗特性および摩耗率特性の何
れにおいても遥かに優れている。特に、電流値が大きい
場合に顕著である。これは、黒鉛粒子または黒鉛粒子を
覆う銅被膜が酸化し難い銀被膜により覆われていること
によるものである。なお、上記特性は、テストＮｏ、２
の場合に最も優れているが、当該テストＮ０．２の場合
は、第３図に図示されている如く、銀の使用量が大きい
ため高価なものになり、実用的でない。テストＮｏ、３
および４の実験結果に示されているように、本発明のカ
ーボン・ブラシをそなえた小型モータは、実用上十分な
接触抵抗特性および摩耗率特性を有しており、銀の使用
量も少なく実用的である。As is clear from Figure 2 (A) (B) to Figure 4 (A) (B), Test No. 2 to 4 are Test No.
o, 1, it is far superior in both contact resistance characteristics and wear rate characteristics. This is particularly noticeable when the current value is large. This is because the graphite particles or the copper coating covering the graphite particles are covered with a silver coating that is difficult to oxidize. Note that the above characteristics are based on test No. 2.
However, in the case of test No. 2, as shown in FIG. 3, the amount of silver used is large, making it expensive and impractical. Test No. 3
As shown in the experimental results in Section 4 and 4, the small motor equipped with the carbon brushes of the present invention has contact resistance characteristics and wear rate characteristics that are sufficient for practical use, and the amount of silver used is small. It is true.
以上、灰分を１ｗｔ％程度含んだ通常の黒鉛粒子に銅メ
ンキが施されたものに対して、更に銀メッキを施して形
成されたカーボン・ブラシについて説明したが、本発明
はこれに限られるものではなく、本願出願人が先に提案
したカーボン・ブラシ（特願平１−１０３２０１号）に
適用しても良い。即ち、高純度処理により精製された黒
鉛原料の粉末粒子に対して銅被覆層と銀被覆層とからな
る２層金属被覆層を形成するするようにしても良い。Above, we have described a carbon brush formed by further applying silver plating to normal graphite particles containing about 1 wt% ash and copper plating, but the present invention is not limited to this. Instead, it may be applied to a carbon brush (Japanese Patent Application No. 1-103201) proposed earlier by the applicant of the present application. That is, a two-layer metal coating layer consisting of a copper coating layer and a silver coating layer may be formed on powder particles of graphite raw material purified by high purity treatment.
以上説明した如く、本発明によれば、黒鉛原料の粉末粒
子に対して銅被覆層と銀被覆層とからなる２層金属被覆
層を形成することにより、銅被覆層の酸化特性が改善さ
れ、電気接触抵抗特性および耐摩耗特性の優れたカーボ
ン・ブラシとその製造方法を提供することができる。As explained above, according to the present invention, by forming a two-layer metal coating layer consisting of a copper coating layer and a silver coating layer on powder particles of graphite raw material, the oxidation characteristics of the copper coating layer are improved. It is possible to provide a carbon brush with excellent electrical contact resistance characteristics and wear resistance characteristics, and a method for manufacturing the same.
（Ａ）(A)
第１図（Ａ） （Ｂ） （Ｃ）は本発明の原理説明口、
第２図（Ａ） （Ｂ）ないし第４図（Ａ） （Ｂ）はブ
ラシ・テスト結果の説明図、第５図は従来のカーボン・
ブラシを説明するための説明図を示す。
図中、１は整流子、２は整流子片、３は回転軸４はカー
ボン・ブラシ、５はブラシ弾性体１１１は黒鉛粒子、１
２は銅被覆層、１３は銀被覆層、２０は黒鉛原料、２１
は銅メッキ処理工程、２２は銀メッキ処理工程、２３は
加圧成形工程、２４は焼成工程を表す。
（Ｃ）
特許出願人 マブナモーター株式会社
代理人弁理士森１）寛（外２名）
（Ａ）
（Ａ）
経過＆ｌ！Ｆ間（１−１）
（Ｂ）
第
図Figures 1 (A), (B), and (C) are openings for explaining the principles of the present invention;
Figures 2 (A) (B) to 4 (A) (B) are explanatory diagrams of the brush test results, and Figure 5 is the conventional carbon
An explanatory diagram for explaining a brush is shown. In the figure, 1 is a commutator, 2 is a commutator piece, 3 is a rotating shaft 4 is a carbon brush, 5 is a brush elastic body 111 is a graphite particle, 1
2 is a copper coating layer, 13 is a silver coating layer, 20 is a graphite raw material, 21
22 represents a copper plating process, 22 represents a silver plating process, 23 represents a pressure molding process, and 24 represents a firing process. (C) Patent applicant Mabuna Motor Co., Ltd. Patent attorney Hiroshi Mori (2 others) (A) (A) Progress &l! Between F (1-1) (B) Figure
Claims (2)
介して転流が行われて回転せしめられる小型モータに使
用され、黒鉛粉末を結合して形成され上記整流子を摺動
する小型モータにおけるカーボン・ブラシにおいて、黒
鉛原料の粉末粒子に対して金属被覆層を形成した上で、
加圧成形され焼成されて形成されたカーボン・ブラシで
あって、上記金属被覆層は、第１層が銅鍍金層により構
成され、第２層が銀鍍金層により構成されていることを
特徴とする小型モータにおけるカーボン・ブラシ。(1) Used in a small motor that is equipped with a permanent magnet as a field and rotated by commutation through a commutator, and is formed by bonding graphite powder and slides on the commutator. In carbon brushes, after forming a metal coating layer on powder particles of graphite raw material,
A carbon brush formed by pressure molding and firing, characterized in that the first layer of the metal coating layer is composed of a copper plating layer, and the second layer is composed of a silver plating layer. carbon brushes in small motors.
介して転流が行われて回転せしめられる小型モータに使
用され、黒鉛粉末を結合して形成され上記整流子を摺動
する小型モータにおけるカーボン・ブラシの製造方法に
おいて、黒鉛の粉末に対して銅被覆層をメッキする銅メ
ッキ処理工程と、上記銅被覆層に対して銀被覆層をメッ
キする銀メッキ処理工程と、上記銀メッキ処理された粉
末を加圧成形せしめる加圧成形工程と、当該加圧成形さ
れた加圧成形物を焼成する焼成工程とをそなえているこ
とを特徴とする小型モータにおけるカーボン・ブラシの
製造方法。(2) Used in a small motor that is equipped with a permanent magnet as a field and rotated by commutation through a commutator, and is formed by bonding graphite powder and slides on the commutator. The method for manufacturing a carbon brush includes a copper plating process of plating a copper coating layer on graphite powder, a silver plating process of plating a silver coating layer on the copper coating layer, and a silver plating process of plating a silver coating layer on the copper coating layer. 1. A method for manufacturing a carbon brush for a small motor, comprising: a pressure molding step of molding powder under pressure; and a firing step of firing the pressure molded product.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20285890A JPH0488853A (en) | 1990-07-31 | 1990-07-31 | Carbon brush in small-sized motor and its manufacture |
| GB9116464A GB2247232A (en) | 1990-07-31 | 1991-07-30 | Sintered carbon brushes |
| DE19914125346 DE4125346A1 (en) | 1990-07-31 | 1991-07-31 | CARBON BRUSH FOR SMALL ENGINES AND METHOD FOR PRODUCING A CARBON BRUSH |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20285890A JPH0488853A (en) | 1990-07-31 | 1990-07-31 | Carbon brush in small-sized motor and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0488853A true JPH0488853A (en) | 1992-03-23 |
Family
ID=16464362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20285890A Pending JPH0488853A (en) | 1990-07-31 | 1990-07-31 | Carbon brush in small-sized motor and its manufacture |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0488853A (en) |
| DE (1) | DE4125346A1 (en) |
| GB (1) | GB2247232A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217605A (en) * | 2017-07-07 | 2019-01-15 | 广东美的生活电器制造有限公司 | Permanent magnet DC motor and food processor |
| WO2019107218A1 (en) * | 2017-12-01 | 2019-06-06 | トライス株式会社 | Brush of motor for automotive electronics |
| CN112746294A (en) * | 2020-12-30 | 2021-05-04 | 上海微电机研究所(中国电子科技集团公司第二十一研究所) | Electroplating method of graphite-molybdenum disulfide electric brush |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0107152D0 (en) * | 2001-03-22 | 2001-05-09 | Johnson Electric Sa | Improvements in or relating to a brush assembly |
| EP1507021A1 (en) * | 2003-08-15 | 2005-02-16 | Deutsche Carbone Ag | Method of applying a metallic coating on graphite discs or blocks and corresponding products |
| US7732058B2 (en) * | 2005-03-16 | 2010-06-08 | Diamond Innovations, Inc. | Lubricious coatings |
| JP2006311639A (en) * | 2005-04-26 | 2006-11-09 | Mitsubishi Electric Corp | Motor for electric power steering device |
| FR2972082B1 (en) * | 2011-02-28 | 2013-03-29 | Mersen France Amiens Sas | CONTACT BROOM |
| WO2023086436A1 (en) * | 2021-11-10 | 2023-05-19 | National Electrical Carbon Products, Inc. | Carbon brush |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2418812A (en) * | 1943-10-08 | 1947-04-15 | Gen Electric | Contact element |
| DE2329698A1 (en) * | 1973-06-09 | 1975-01-02 | Ringsdorff Werke Gmbh | CONTACT PIECE, IN PARTICULAR BRUSH |
| JPS6044277B2 (en) * | 1977-04-21 | 1985-10-02 | 日本鉱業株式会社 | Multilayer metal-coated carbon powder and its sintered body |
| US4240830A (en) * | 1978-11-30 | 1980-12-23 | Westinghouse Electric Corp. | Method for making sintered metal-coated graphite for high-current collector brushes |
-
1990
- 1990-07-31 JP JP20285890A patent/JPH0488853A/en active Pending
-
1991
- 1991-07-30 GB GB9116464A patent/GB2247232A/en not_active Withdrawn
- 1991-07-31 DE DE19914125346 patent/DE4125346A1/en not_active Ceased
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217605A (en) * | 2017-07-07 | 2019-01-15 | 广东美的生活电器制造有限公司 | Permanent magnet DC motor and food processor |
| WO2019107218A1 (en) * | 2017-12-01 | 2019-06-06 | トライス株式会社 | Brush of motor for automotive electronics |
| CN111434013A (en) * | 2017-12-01 | 2020-07-17 | 特耐斯株式会社 | Brush of motor for electric fitting of automobile |
| CN112746294A (en) * | 2020-12-30 | 2021-05-04 | 上海微电机研究所(中国电子科技集团公司第二十一研究所) | Electroplating method of graphite-molybdenum disulfide electric brush |
| CN112746294B (en) * | 2020-12-30 | 2021-12-24 | 上海微电机研究所(中国电子科技集团公司第二十一研究所) | Electroplating method of graphite-molybdenum disulfide electric brush |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4125346A1 (en) | 1992-03-05 |
| GB9116464D0 (en) | 1991-09-11 |
| GB2247232A (en) | 1992-02-26 |
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