JPH0259211B2

JPH0259211B2 -

Info

Publication number: JPH0259211B2
Application number: JP57216155A
Authority: JP
Inventors: Fujimatsu Takiguchi
Original assignee: Tanaka Kikinzoku Kogyo KK
Current assignee: Tanaka Kikinzoku Kogyo KK
Priority date: 1982-12-08
Filing date: 1982-12-08
Publication date: 1990-12-11
Also published as: JPS59107045A

Description

[Detailed description of the invention]

本発明は、刷子用摺動接点材料の改良に関す
る。従来、摺動接点材料としては各種材料が用いら
れ、とりわけ刷子用摺動接点材料としては、硬
さ、耐蝕性、ばね性等の優れた、Au61.5〜63.5重
量％、Ag6.5〜8.5重量％、Cu29〜31重量％より
成る合金材料が広く用いられていた。然し乍ら、この合金材料で製作した刷子接点で
は、整流子との摺動時にCuの酸化物が生成され
接触抵抗が高く不安定であつた。本発明は、斯かる欠点を解消すべくなされたも
のであり、前記合金材料を基材としてこれにCu
よりも酸化しにくい特定の元素を僅かに添加させ
て、発生するCuの酸化物を抑え接触抵抗を低く
安定した刷子用摺動接点材料を提供せんとするも
のである。本発明の刷子用摺動接点材料は、組成比で
Au61.5〜63.5重量％、Ag6.5〜8.5重量％、Cu29
〜31重量％のAu−Ag−Cuが95〜99.5重量％及び
残部がＢ及びTlの少なくとも一種を合計で0.5〜
５重量％から成るものである。本発明の刷子用摺動接点材料に於いて、組成比
でAu61.5〜63.5重量％、Ag6.5〜8.5重量％、
Cu29〜31重量％のAu−Ag−Cuが95〜99.5重量％
及び残部がＢ及びTlの少なくとも一種を合計で
0.5〜５重量％としている理由は、前記従来の合
金材料の接触抵抗を向上させる為で、Ｂ及びTl
のうち少なくとも一種を合計で0.5重量％未満で
はその効果を発揮できず、Ｂ及びTlのうち少な
くとも一種を合計で５重量％を超えるとばね性が
劣化するものである。またAu，Ag，Cuの含有量は、前記従来の合金
材料の組成比に変更を加えない範囲とすることに
より、従来の合金材料の特性は損なわれることな
く発揮されることとなるものである。次に従来の合金材料を基材とし、これにＢを添
加し表の実施例１に示す成分組成の刷子用摺動接
点材料とし、以下同様にして表に示す成分組成の
本発明による刷子用摺動接点材料と従来の刷子用
摺動接点材料を用いて夫々線径0.7mmの刷子線材
を作り、これを各々長さ８mmに切断し、２本並列
させて一端を幅10mm、長さ13mm、厚さ0.2mmの台
材に溶接し、他端に2Rの円弧状の接触部を曲成
して刷子接点を作つた。そして夫々の刷子接点を
円盤状の整流子に接触させ、整流子を正逆回転さ
せて下記の試験条件にて摺動試験を行い、摩耗量
及び接触抵抗を測定した処、下記の表の右欄に示
すような結果を得た。試験条件電流：直流0.6A 電圧：12V 負荷：抵抗負荷回転速度：1000回転／分周速：130〜120ｍ／min 接触力：100ｇ試験時間：７時間 The present invention relates to improvements in sliding contact materials for brushes. Conventionally, various materials have been used as sliding contact materials, and in particular, as sliding contact materials for brushes, Au61.5-63.5% by weight, Ag6.5-8.5%, which have excellent hardness, corrosion resistance, spring properties, etc. alloy materials consisting of 29-31% Cu by weight were widely used. However, in brush contacts made of this alloy material, Cu oxides were generated during sliding with the commutator, resulting in high contact resistance and instability. The present invention has been made to eliminate such drawbacks, and uses the above-mentioned alloy material as a base material and coats it with Cu.
The purpose of the present invention is to provide a sliding contact material for brushes that suppresses the generated Cu oxide and has a low and stable contact resistance by adding a small amount of a specific element that is more difficult to oxidize than copper. The sliding contact material for brushes of the present invention has a composition ratio of
Au61.5~63.5wt%, Ag6.5~8.5wt%, Cu29
-31% by weight of Au-Ag-Cu, 95-99.5% by weight, and the balance of at least one of B and Tl, totaling 0.5-31% by weight
It consists of 5% by weight. In the sliding contact material for brushes of the present invention, the composition ratio is 61.5 to 63.5% by weight of Au, 6.5 to 8.5% by weight of Ag,
Cu29-31wt% Au-Ag-Cu95-99.5wt%
and the remainder is a total of at least one of B and Tl
The reason why the content is 0.5 to 5% by weight is to improve the contact resistance of the conventional alloy materials, and B and Tl
If the total amount of at least one of these is less than 0.5% by weight, the effect cannot be exhibited, and if the total amount of at least one of B and Tl exceeds 5% by weight, the spring properties will deteriorate. Furthermore, by setting the content of Au, Ag, and Cu within a range that does not change the composition ratio of the conventional alloy material, the characteristics of the conventional alloy material can be exhibited without being impaired. . Next, a conventional alloy material is used as a base material, and B is added thereto to obtain a brush sliding contact material having the composition shown in Example 1 in the table. Brush wires with a wire diameter of 0.7 mm were made using the sliding contact material and the conventional sliding contact material for brushes, each was cut to a length of 8 mm, and two wires were placed in parallel with one end having a width of 10 mm and a length of 13 mm. A brush contact was made by welding to a 0.2 mm thick base material and bending a 2R arc-shaped contact part at the other end. Then, each brush contact was brought into contact with a disk-shaped commutator, and the commutator was rotated in forward and reverse directions to perform a sliding test under the following test conditions, and the wear amount and contact resistance were measured. The results shown in the column were obtained. Test conditions Current: DC 0.6A Voltage: 12V Load: Resistance load Rotation speed: 1000 rotations/divided speed: 130 to 120m/min Contact force: 100g Test time: 7 hours

【表】上記の表で明らかなように実施例１〜９の刷子
接点は従来例の刷子接点に比し摩耗量が著しく少
なく、接触抵抗が低く安定していることが判る。
これはひとえに実施例１〜９の刷子接点の刷子線
材を構成している本発明の刷子用摺動接点材料
が、摺動時にＢ、Tl等の酸化物が潤滑剤となり、
耐摩耗性が向上するからに他ならない。また、酸
化物が軟らかい為、摺動作用により容易に除去さ
れるので、接触抵抗は低く安定するに他ならな
い。以上詳記した通り本発明による刷子用摺動接点
材料によれば、従来の刷子用摺動接点材料に比べ
著しく耐摩耗性に優れ、摩耗粉の発生量が極めて
少なく、ノイズの発生が殆んど無く、また従来の
刷子用摺動接点材料による場合よりも低く安定し
た接触抵抗を有する刷子接点を得ることができる
という効果がある。[Table] As is clear from the above table, the brush contacts of Examples 1 to 9 had significantly less wear than the conventional brush contacts, and it was found that the contact resistance was low and stable.
This is simply because the sliding contact material for brushes of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 9, uses oxides such as B and Tl as lubricants during sliding.
This is because it improves wear resistance. Furthermore, since the oxide is soft, it is easily removed by sliding action, so the contact resistance is low and stable. As detailed above, the sliding contact material for brushes according to the present invention has significantly superior wear resistance compared to conventional sliding contact materials for brushes, generates extremely little wear powder, and generates almost no noise. This has the advantage that it is possible to obtain a brush contact having a lower and more stable contact resistance than when using conventional brush contact materials.

Claims

[Claims]

1 Au-Ag-Cu with a composition ratio of 61.5 to 63.5% by weight, 61.5 to 63.5% by weight of Au, 6.5 to 8.5% by weight of Ag, and 29 to 31% by weight of Cu is 95 to 99.5%.
A sliding contact material for a brush, characterized in that the balance by weight is a total of 0.5 to 5 weight % of at least one of B and Tl.