JPH0365423B2

JPH0365423B2 -

Info

Publication number: JPH0365423B2
Application number: JP58138537A
Authority: JP
Priority date: 1983-07-28
Filing date: 1983-07-28
Publication date: 1991-10-11
Also published as: JPS6029437A

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、
Pd30〜70重量％、Ag30〜70重量％より成る合金
材料が広く用いられていた（昭和40年７月８日に
工業日日新聞社から発行された日本電子材料技術
協会編の新しい接点材料第114、115頁参照）。然し乍ら、この合金材料で製作した刷子接点で
は、整流子との摺動時の耐摩耗性が劣り、摩耗粉
が生じ易く、接触抵抗が不安定でノイズ発生の原
因となつていた。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特定
の材料を僅かに添加させて、耐摩耗性を向上させ
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
Pd30〜70重量％、Ag30〜70重量％のPd−Agが
92〜98.9重量％及び残部がSn1.0〜5.0重量％、Si、
Bi及びGeの少なくとも一種を合計で１〜３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Pd30〜70重量％、Ag30〜70重量％のPd−Ag
が92〜98.9重量％及び残部がSn1.0〜5.0重量％、
Si、Bi及びGeの少なくとも一種を合計で0.1〜３
重量％としている理由は、前記従来の合金材料の
耐摩耗性を向上すべく硬くする為で、Snが１重
量％未満あるいは、Si、Bi及びGeのうち少なく
とも一種を合計で0.1重量％未満ではその効果を
発揮できず、Snが５重量％を超えるかあるいは、
Si、Bi及びGeのうち少なくとも一種を合計で3.0
重量％を超えると酸化物の発生量が多くなり、接
触抵抗が高くなり、その上不安定となるものであ
る。また、Pd、Ag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Snと
Si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,
Alloy materials consisting of 30-70% by weight of Pd and 30-70% by weight of Ag were widely used. (See pages 114 and 115). However, brush contacts made of this alloy material have poor abrasion resistance when sliding with the commutator, tend to generate abrasion powder, and have unstable contact resistance, causing noise generation. The present invention has been made to eliminate such drawbacks, and provides a sliding contact material for brushes that uses the above-mentioned alloy material as a base material and has improved wear resistance by adding a small amount of a specific material to the alloy material. This is what we intend to provide. The sliding contact material for brushes of the present invention has a composition ratio of
Pd-Ag with Pd30~70wt% and Ag30~70wt%
92 to 98.9% by weight and the balance is Sn 1.0 to 5.0% by weight, Si,
The total amount of at least one of Bi and Ge is 1 to 3% by weight. In the sliding contact material for brushes of the present invention, the Pd-Ag composition ratio is 30 to 70% by weight of Pd and 30 to 70% by weight of Ag.
is 92-98.9% by weight and the balance is Sn 1.0-5.0% by weight,
At least one of Si, Bi and Ge in total of 0.1 to 3
The reason why it is expressed as % by weight is to make the conventional alloy material hard in order to improve its wear resistance. If the effect cannot be achieved and the Sn content exceeds 5% by weight,
A total of 3.0 of at least one of Si, Bi, and Ge
If it exceeds % by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable. Further, by setting the contents of Pd and Ag 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, we used a conventional alloy material as a base material, and added Sn and
By adding Si, a sliding contact material for a brush having the composition shown in Example 1 of the table was prepared, and a sliding contact material for a brush according to the present invention having the composition shown in the table and a conventional sliding contact for a brush were prepared in the same manner. Brush wire rods with a wire diameter of 0.7 mm were made using the materials, and each was cut into lengths of 8 mm.
Two pieces are placed in parallel and one end is 10mm wide, 13mm long, and thick.
A brush contact was made by welding to a 0.2 mm 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: 130-120m/min Contact force: 100g Test time: 7 hours

【表】上記の表で明らかなように実施例１〜12の刷子
接点は従来例１〜３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１〜12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、SnとSi、Bi、Geの少なくとも一種によ
つて硬くなり、耐摩耗性が向上されるからに他な
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 12 have significantly less wear than the brush contacts of Conventional Examples 1 to 3, and it can be seen that the contact resistance is 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 12, is hardened by Sn and at least one of Si, Bi, and Ge, and has excellent wear resistance. It's only because it improves. 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 sliding contact materials.

Claims

[Claims]

1 Composition ratio: Pd 30-70% by weight, Ag 30-70% by weight
Pd-Ag is 92~98.9% by weight and the balance is Sn1.0~
5.0% by weight, and at least one of Si, Bi, and Ge in a total amount of 0.1 to 3% by weight.