【発明の詳細な説明】[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、軟化温度が低く整流子との摺動時に凝着し
て、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
の元素を僅かに添加させて、軟化温度を高くし、
耐凝着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
Au61.5〜63.5重量％、Ag6.5〜8.5重量％、Cu29
〜31重量％のAu−Ag−Cuが93〜99.5重量％及び
残部がGa0.5〜７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93〜99.5重量％
及び残部がGa0.5〜７重量％としている理由は、
前記従来の合金材料の耐凝着性を向上すべく軟化
温度を高める為で、Ga0.5重量％未満ではその効
果を発揮できず、Ga7重量％を超えると酸化物の
発生量が多くなり、接触抵抗が高く不安定とな
り、その上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Ga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, brush contacts made of this alloy material have a low softening temperature and tend to adhere when sliding against the commutator, producing abrasion powder, resulting in unstable contact resistance and causing noise. The present invention has been made in order to eliminate such drawbacks, and uses the above-mentioned alloy material as a base material and slightly adds a specific element to it to increase the softening temperature.
It is an object of the present invention to provide a sliding contact material for brushes with improved adhesion resistance. 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, 93-99.5% by weight, and the balance 0.5-7% by weight Ga. 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-Cu93-99.5wt%
The reason why the balance is 0.5 to 7% by weight is as follows.
This is to increase the softening temperature in order to improve the adhesion resistance of the conventional alloy material, and if it is less than 0.5% by weight of Ga, the effect cannot be exhibited, and if it exceeds 7% by weight, the amount of oxides generated increases. The contact resistance is high and unstable, and the spring properties are deteriorated. 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 Ga 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１〜８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１〜８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、Gaにより軟化温度を高め、摺動時の凝着が
防止されて、耐摩耗性及び接触抵抗特性が向上す
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 8 have significantly less wear than the conventional brush contacts, and it can be seen that the contact resistance is low and stable.
This is because the sliding contact material for brushes of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 8, has a high softening temperature due to Ga, prevents adhesion during sliding, and is resistant to wear. This is because the properties and contact resistance characteristics are improved. 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.