【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、
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
は軟化温度が低く、整流子との摺動時に凝集して
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、前記合金材料を基板としてこれに特定
の材料を僅かに添加させて、軟化温度を高め耐凝
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
Pd30〜70重量％、Ag30〜70重量％のPd−Agが
90〜99重量％及び残部がCo及びTiの少くとも一
種を合計で１〜10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90〜99重量％及び残部がCo及びTiの少くとも
一種を合計で１〜10重量％としている理由は、前
記従来の合材料の耐凝着性を向上すべく軟化温度
を高める為で、Co及びTiのうち少なくとも一種
を合計で、1.0重量％未満ではその効果を発揮で
きず、Co及びTiのうち少なくとも一種を合計で
10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なるものである。
次に従来の合金材料を基板とし、これにCo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 a low softening temperature and tend to aggregate when sliding with a commutator, producing abrasion powder, resulting in unstable contact resistance and noise generation. The present invention has been made to eliminate such drawbacks, and provides a brush slide in which the above-mentioned alloy material is used as a substrate and a specific material is slightly added to it to increase the softening temperature and improve the adhesion resistance. The purpose is to provide a moving contact material. The sliding contact material for brushes of the present invention has a composition ratio of
Pd-Ag with Pd30~70wt% and Ag30~70wt%
90 to 99% by weight, and the balance consists of a total of 1 to 10% by weight of at least one of Co and Ti. 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.
The reason why the proportion is 90 to 99% by weight and the balance is 1 to 10% by weight in total of at least one of Co and Ti is to increase the softening temperature in order to improve the adhesion resistance of the conventional composite material. If the total amount of at least one of Co and Ti is less than 1.0% by weight, the effect cannot be exhibited;
If it exceeds 10% by weight, the amount of oxides generated increases,
The contact resistance becomes high and, moreover, it becomes 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, a conventional alloy material is used as a substrate, and Co 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. , thickness 0.2mm
A brush contact was made by welding it to the base material and bending a 2R arc-shaped contact part at the other end. Then, each brush contact was brought into contact with a disc-shaped commutator, the commutator was rotated forward and backward, and a sliding test was conducted 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１〜８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、摺動時にCo、Tiの少なくとも一種によ
り軟化温度が高められ、耐凝着性が向上されるか
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 8 have significantly less wear compared to the brush contacts of Conventional Examples 1 to 3, 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 softening temperature increased by at least one of Co and Ti during sliding, and has a high adhesion resistance. This is 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 contact materials.