JPH0813181B2 - Metal graphite brush - Google Patents
Metal graphite brushInfo
- Publication number
- JPH0813181B2 JPH0813181B2 JP1013230A JP1323089A JPH0813181B2 JP H0813181 B2 JPH0813181 B2 JP H0813181B2 JP 1013230 A JP1013230 A JP 1013230A JP 1323089 A JP1323089 A JP 1323089A JP H0813181 B2 JPH0813181 B2 JP H0813181B2
- Authority
- JP
- Japan
- Prior art keywords
- brush
- metal
- graphite
- powder
- graphite 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.)
- Expired - Fee Related
Links
- 229910002804 graphite Inorganic materials 0.000 title claims description 25
- 239000010439 graphite Substances 0.000 title claims description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title description 18
- 229910052751 metal Inorganic materials 0.000 title description 13
- 239000002184 metal Substances 0.000 title description 13
- 239000011148 porous material Substances 0.000 claims description 15
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-AHCXROLUSA-N copper-60 Chemical group [60Cu] RYGMFSIKBFXOCR-AHCXROLUSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
Landscapes
- Manufacturing Of Electrical Connectors (AREA)
- Motor Or Generator Current Collectors (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は長寿命、低摺動音化が要求されるワイパー
モータ，自動車電装用モータやマイクロモータ等に使用
する金属黒鉛質ブラシに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal graphite brush used for a wiper motor, a motor for automobile electrical equipment, a micromotor, etc., which is required to have long life and low sliding noise.
従来の技術 従来、この種の金属黒鉛質ブラシは、例えば、黒鉛原
料に嵩密度の低いものを用いたり、揮発成分の多いバイ
ンダーを加えて焼成時のバインダーの揮発によってブラ
シをやわらかくしたり、あるいは成型圧を低くしたりし
て製造していた。このようにしてブラシの機械的強度を
下げるとともに、ブラシの座乗性を良好にし、しかも低
い摺動音にしようとするものであった。Conventional technology Conventionally, this type of metal-graphite brush uses, for example, a graphite raw material having a low bulk density, or a binder having a large volatile component is added to soften the brush by volatilizing the binder during firing, or It was manufactured by lowering the molding pressure. In this way, the mechanical strength of the brush is lowered, the sitting property of the brush is improved, and the sliding noise is reduced.
発明が解決しようとする問題点 しかしながら、このような従来の金属黒鉛質ブラシに
あっては、摺動音の低減効果が不十分であったり、ある
いは機械的強度が通常品の1/2〜1/3と低下するため、特
にモータに偏心や段差がある場合、ブラシの摩耗が顕著
になる欠点があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a conventional metal-graphite brush, the effect of reducing the sliding noise is insufficient, or the mechanical strength is 1/2 to 1 times that of a normal product. Since it decreases to / 3, there is a drawback that the brush wear becomes noticeable especially when the motor has an eccentricity or a step.
さらに、最近の金属黒鉛質ブラシに対する要求として
は、摺動音の低減と高速回転での耐摩耗性の向上をあげ
ることができる。とくに、自動車電装用のモータにおい
ては、この種の要求が極めて強くなってきている。Further, recent demands for metal graphite brushes include reduction of sliding noise and improvement of wear resistance at high speed rotation. In particular, this kind of demand is becoming extremely strong in motors for automobile electrical equipment.
これに対し、従来は機械的強度を低下させ、追従性や
摺動音の改良を行ってきた。On the other hand, conventionally, the mechanical strength has been reduced to improve the followability and sliding noise.
しかし、その反面、多少の整流子の偏心や段差によっ
てブラシの摩耗が増大するなどの新たな問題が生じるよ
うになった。On the other hand, however, new problems such as increased abrasion of the brush due to some eccentricity and step of the commutator have come to occur.
また、摺動音の低減に対しては従来の対策は不十分で
あった。Further, conventional measures have not been sufficient for reducing sliding noise.
さらに、従来の金属黒鉛質ブラシには次のような問題
点もあった。Further, the conventional metal graphite brush has the following problems.
（１）黒鉛原料に嵩密度の低いものを用いると、ブラシ
の嵩密度が低下し、座乗性は改善されるが、比抵抗が高
くなりやすく、接触抵抗が増大して、出力低下を招く欠
点がある。(1) When a graphite raw material having a low bulk density is used, the bulk density of the brush is reduced and the sitting property is improved, but the specific resistance is likely to be high, the contact resistance is increased, and the output is reduced. There are drawbacks.
（２）揮発分の多いバインダーを用いると、ブラシの機
械的強度が極端に低下し、加工時や使用時に破損しやす
くなる。また、熱膨張が大きくなり、ブラシホルダーへ
の固着問題が生じる。さらに、皮膜が着きやすくなるた
め、接触抵抗が高くなりやすい。(2) If a binder with a high volatile content is used, the mechanical strength of the brush is extremely reduced, and the brush is easily damaged during processing or use. Further, the thermal expansion becomes large, which causes a problem of sticking to the brush holder. Furthermore, since the film easily adheres, the contact resistance tends to increase.
（３）成型圧を低くしただけでは、前述の問題点が少し
改善されるものの、音や摩耗がそれほど改善されない。(3) Even if the molding pressure is lowered, the above-mentioned problems are slightly improved, but the sound and wear are not so improved.
発明の目的 この発明は前述のような従来技術の種々の欠点を改善
して、機械的強度を大きく低下させる事なしに摺動音の
小さい金属黒鉛質ブラシを提供することを目的としてい
る。OBJECT OF THE INVENTION It is an object of the present invention to provide a metal-graphite brush having a low sliding noise without remarkably reducing mechanical strength by improving various drawbacks of the above-mentioned prior art.
発明の要旨 この発明は回転数2200rpm以上の高速回転モータ用の
ブラシであって、水銀ポロシメーターによる気孔径分布
の測定で５〜300μｍの気孔径の占める気孔量が気孔量
全体の20％〜70％を占め、かつそれらの５〜300μｍの
気孔がブラシ組織内に分散されていて、嵩密度が2.53g/
cm3以下であることを特徴とする金属黒鉛質ブラシを要
旨とするものである。SUMMARY OF THE INVENTION The present invention is a brush for a high-speed rotation motor having a rotation speed of 2200 rpm or more, and the pore volume occupied by the pore diameter of 5 to 300 μm is 20% to 70% of the total pore volume in the measurement of the pore diameter distribution by a mercury porosimeter. , And the pores of 5 to 300 μm are dispersed in the brush tissue, and the bulk density is 2.53 g /
The gist of the present invention is a metal-graphite brush characterized by having a size of cm 3 or less.
発明の効果 この発明による金属黒鉛質ブラシは、曲げ強さを通常
品と比較して実用上問題となるほど変化させることな
く、嵩密度を2.53g/cm3以下と低くしているにもかかわ
らず、整流子に対するブラシの追従性を良くすることが
でき、その結果、摺動音を大幅に低減できる。しかも、
耐摩耗性も極めて良好である。Advantageous Effects of Invention The metal-graphite brush according to the present invention does not change the bending strength to a practical degree as compared with the ordinary product, and has a low bulk density of 2.53 g / cm 3 or less. The followability of the brush to the commutator can be improved, and as a result, sliding noise can be significantly reduced. Moreover,
The abrasion resistance is also very good.
したがって、この発明による金属黒鉛質ブラシは回転
数2200rpm以上の高速回転モータの出力低下を招くこと
なく、機械的強度を所望の値に保持しつつ摺動音を大幅
に低減でき、しかも耐摩耗性を改善できるのである。こ
のような効果は特にワイパーモータなど自動車電装用モ
ータやマイクロモータのように、高速回転用であるとと
もに低い摺動音が求められるモータに適用したとき極め
て顕著となる。Therefore, the metal-graphite brush according to the present invention can significantly reduce the sliding noise while maintaining the mechanical strength at a desired value without causing a reduction in the output of a high-speed rotation motor having a rotation speed of 2200 rpm or more, and further, wear resistance. Can be improved. Such an effect is particularly remarkable when applied to a motor for high-speed rotation and a low sliding noise, such as a motor for electric equipment of automobiles such as a wiper motor or a micromotor.
実施例 この発明による金属黒鉛質ブラシは、ワイパーモー
タ、自動車電装用モータ、マイクロモータのように2200
rpm以上の高速回転用モータに使用するものである。Example A metal graphite brush according to the present invention is used for a wiper motor, a motor for automobile electrical equipment, a
It is used for high-speed rotation motors of rpm or higher.
本発明では、ブラシ組織内に５〜300μｍの気孔を分
散させる。水銀ポロシメーターによる気孔径分布の測定
で５〜300μｍの気孔径の占める気孔量が気孔量全体の2
0％〜70％を占めるように設定する。In the present invention, pores of 5 to 300 μm are dispersed in the brush tissue. Porosity of 5 to 300 μm occupies 2% of total porosity measured by mercury porosimeter.
Set to occupy 0% to 70%.
このような金属黒鉛質ブラシは、例えば、ブラシ原料
に粉末状の揮発性物質例えばPVAまたはセルロースを所
定量加えることによって作る。ワイパーモータの場合、
５〜20重量％のPVAまたは、５〜10重量％のセルロース
を加えるとよい。この揮発性物質は熱処理時に揮発され
て５〜300μｍの気孔をブラシ組織内に形成する。Such a metal-graphite brush is produced, for example, by adding a predetermined amount of a powdery volatile substance such as PVA or cellulose to the brush raw material. For wiper motors,
It is advisable to add 5 to 20% by weight of PVA or 5 to 10% by weight of cellulose. This volatile substance is volatilized during the heat treatment to form pores of 5 to 300 μm in the brush structure.
一般に金属黒鉛質ブラシは黒鉛に有機結合剤を加えて
混練し、粉砕後に用途に応じて銅粉等の金属粉末を混合
してから成型および焼成して製造されているが、この発
明においては、これらの工程の中で黒鉛の混練時または
金属粉との混合時に揮発性粉末を原料に対して所定量添
加して、均一に混合した後成型を行って熱処理をし、そ
の熱処理の時に添加した揮発性物質を揮発させ、ブラシ
組織内に５〜300μｍの気孔を形成して所望の金属黒鉛
質ブラシを得るものである。In general, the metal graphite brush is manufactured by kneading by adding an organic binder to graphite, and after crushing, mixing metal powder such as copper powder according to the application and then molding and firing, but in the present invention, In these steps, a predetermined amount of volatile powder was added to the raw material when kneading graphite or mixing with metal powder, and after uniformly mixing, molding was performed and heat treatment was performed, and it was added at the time of the heat treatment. A volatile substance is volatilized to form pores of 5 to 300 μm in the brush structure to obtain a desired metallic graphite brush.
なお、この発明による金属ブラシは各種のものが可能
であり、金属粉を混合しない黒鉛質ブラシにも適用でき
るものである。Various types of metal brushes according to the present invention can be used, and the present invention can also be applied to a graphite brush in which metal powder is not mixed.
実施例１〜３ 天然黒鉛粉（日本黒鉛CB−150）100部に対し、フェノ
ール樹脂15部をアルコール30部に溶解したものを結合剤
として加えて、混練後に乾燥および粉砕し、混練粉とし
た。つぎに、その混練粉65部と銅粉35部に対して揮発性
粉末としてPVAを表１の割合で混合し、2.5t/cm2で成型
した後に還元雰囲気500℃で焼成し、金属黒鉛質ブラシ
を得た。Examples 1 to 3 To 100 parts of natural graphite powder (Nippon Graphite CB-150), 15 parts of phenol resin dissolved in 30 parts of alcohol was added as a binder, dried and crushed after kneading to obtain a kneaded powder. . Next, 65 parts of the kneaded powder and 35 parts of copper powder were mixed with PVA as a volatile powder in the ratio shown in Table 1, molded at 2.5 t / cm 2 , and fired in a reducing atmosphere at 500 ° C. Got a brush
同様にして、従来品１と、比較例１および２について
も、表１に示す条件で金属黒鉛質ブラシを製造した。Similarly, for the conventional product 1 and the comparative examples 1 and 2, metal graphite brushes were manufactured under the conditions shown in Table 1.
従来品１、比較例１および２、本発明の実施例１〜３
について嵩密度、比抵抗、曲げ強さ、摩耗、回転数およ
び摺動音を測定したところ表１に示すとおりであった。Conventional product 1, Comparative examples 1 and 2, Examples 1 to 3 of the present invention
The bulk density, the specific resistance, the bending strength, the wear, the number of revolutions and the sliding noise were measured and the results are shown in Table 1.
表１から明らかなように、この発明による実施例１〜
３は摩耗および摺動音について従来品１や比較例１およ
び２と比較してすぐれていた。As is clear from Table 1, Examples 1 to 1 according to the present invention
No. 3 was superior in wear and sliding noise to the conventional product 1 and Comparative Examples 1 and 2.
なお、PVAは粒径が100μｍよりも小さいもののみを使
用した。Only PVA having a particle size smaller than 100 μm was used.
実施例４および５ 粒径100μｍ以下の人造黒鉛粉100部に対して揮発性粉
末としてセルロース粉を表２の割合で添加・混合し、混
合粉を得た。セルロース粉末の粒径は10〜50μｍであっ
た。フェノール樹脂15部をアルコール40部で溶解した結
合剤によって前述の混合粉を混練した後、乾燥および粉
砕し、銅粉40部，混練粉60部の割合で混合し、2t/cm2で
成型した後500℃で焼成して金属黒鉛質ブラシを得た。Examples 4 and 5 Cellulose powder as a volatile powder was added and mixed in a ratio of Table 2 to 100 parts of artificial graphite powder having a particle size of 100 µm or less to obtain a mixed powder. The particle size of the cellulose powder was 10 to 50 μm. The above mixed powder was kneaded with a binder prepared by dissolving 15 parts of phenol resin in 40 parts of alcohol, then dried and crushed, mixed with 40 parts of copper powder and 60 parts of kneaded powder, and molded at 2 t / cm 2 . Then, it was fired at 500 ° C. to obtain a metal graphite brush.
同様にして比較例3,4および５も製造した。 Comparative Examples 3, 4 and 5 were similarly prepared.
これらの実施例４および５と、比較例3,4および５に
ついて嵩密度、比抵抗、曲げ強さ、摩耗および回転数を
測定したところ表２のような結果を得た。When the bulk density, the specific resistance, the bending strength, the wear and the rotation speed of these Examples 4 and 5 and Comparative Examples 3, 4 and 5 were measured, the results shown in Table 2 were obtained.
表２から明らかなように、この発明の実施例４および
５は特に摩耗の点で優れていることが判明した。As is clear from Table 2, Examples 4 and 5 of the present invention were found to be particularly excellent in terms of wear.
この発明による金属黒鉛質ブラシをラジエターファン
用モータに適用すると、高速回転において従来品１に比
較して摩耗が1/2〜1/3に低減できるという顕著な効果が
得られたのである。When the metal-graphite brush according to the present invention is applied to a radiator fan motor, the remarkable effect that the wear can be reduced to 1/2 to 1/3 as compared with the conventional product 1 at high speed rotation is obtained.
実施例６〜８ 実施例１〜３と同様の方法でPVAを10重量％とし、PVA
の粒径を表３に示す粒径に設定して気孔径による比較を
行った。Examples 6 to 8 PVA was adjusted to 10% by weight in the same manner as in Examples 1 to 3 to obtain PVA.
The particle size was set to the particle size shown in Table 3 for comparison by the pore size.
表３から明らかなように、気孔径が５μｍよりも小さ
いと、摺動音や摩耗が改善されず、300μｍよりも大き
い気孔径を形成しようとすると、焼成時にクラックが発
生し、所望のブラシが製造できなかった。As is clear from Table 3, when the pore diameter is smaller than 5 μm, sliding noise and wear are not improved, and when a pore diameter larger than 300 μm is attempted to be formed, cracks are generated during firing and the desired brush is not formed. Could not be manufactured.
なお、表１について説明を追加すると、この発明によ
る金属黒鉛質ブラシをワイパーモータに用いると、従来
品１に比べてモータの回転数の低下を招くことなく摩耗
および摺動音について顕著な効果が認められ、実用上の
効果が大きい。In addition, adding a description to Table 1, when the metal graphite brush according to the present invention is used for a wiper motor, a remarkable effect on wear and sliding noise can be obtained without lowering the rotation speed of the motor as compared with the conventional product 1. It is recognized and has a great practical effect.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮下 昌紀 山形県西置賜郡小国町大字小国町378番地 東芝セラミックス株式会社小国製造所内 (56)参考文献 特開 昭56−94946（ＪＰ，Ａ) 特開 昭54−105704（ＪＰ，Ａ) 特公 昭62−45670（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Miyashita, Oguni Town, Oguni Town, Nishikitama District, Yamagata Prefecture 378, Oguni Town, Toshiba Ceramics Co., Ltd. (56) Reference JP-A-56-94946 (JP, A) 54-105704 (JP, A) JP-B 62-45670 (JP, B2)
Claims (1)
ブラシであって、水銀ポロシメーターによる気孔径分布
の測定で５〜300μｍの気孔径の占める気孔量が気孔量
全体の20％〜70％を占め、かつそれらの５〜300μｍの
気孔がブラシ組織内に分散されていて、嵩密度が2.53g/
cm3以下であることを特徴とする金属黒鉛質ブラシ。1. A brush for a high-speed rotation motor having a rotation speed of 2200 rpm or more, wherein the pore volume occupied by the pore diameter of 5 to 300 μm is 20% to 70% of the total pore volume measured by a mercury porosimeter. And their pores of 5 to 300 μm are dispersed in the brush tissue, and the bulk density is 2.53 g /
A metal-graphite brush characterized by having a size of not more than cm 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1013230A JPH0813181B2 (en) | 1989-01-24 | 1989-01-24 | Metal graphite brush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1013230A JPH0813181B2 (en) | 1989-01-24 | 1989-01-24 | Metal graphite brush |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02197238A JPH02197238A (en) | 1990-08-03 |
| JPH0813181B2 true JPH0813181B2 (en) | 1996-02-07 |
Family
ID=11827383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1013230A Expired - Fee Related JPH0813181B2 (en) | 1989-01-24 | 1989-01-24 | Metal graphite brush |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0813181B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4618485B2 (en) | 2004-08-27 | 2011-01-26 | アイシン精機株式会社 | Manufacturing method of brush material for motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54105704A (en) * | 1978-02-08 | 1979-08-20 | Oopatsuku Kk | Metallic graphite brush |
| JPS5694946A (en) * | 1979-12-28 | 1981-07-31 | Toshiba Ceramics Co Ltd | Metallic graphite brush |
| JPS6245670A (en) * | 1985-08-22 | 1987-02-27 | Nippon Kayaku Co Ltd | Resin composition for undercoating of metallized paper |
-
1989
- 1989-01-24 JP JP1013230A patent/JPH0813181B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02197238A (en) | 1990-08-03 |
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