【発明の詳細な説明】[Detailed description of the invention]
本発明は、小型モータの整流子外周に摺接する
刷子接点の刷子板材を作る刷子用摺動接点材料
（以下「摺動接点材料」という。）の改良に関す
る。
従来より小型モータの整流子外周に摺接する刷
子接点の刷子板材を作る摺動接点材料として硬
さ、ばね特性等の優れたTi2.4〜3.4重量％、残部
Cuより成るTi−Cuが用いられてきたが、Ti−Cu
ではCuが酸化し易く、酸化Cuの生成により接触
抵抗が高く不安定になり、また耐消耗性が劣化す
るという欠点があつた。
本発明は、かかる欠点を解消すべくなされたも
ので、接触抵抗を低く安定させ且つ耐消耗性を向
上させたTi−Cu系の摺動接点材料を提供せんと
するものである。
本発明の摺動接点材料は、Ti2.3〜3.4重量％、
Ｂ及びT1の少なくとも一種を合計で0.5〜５重量
％及び残部CuのCu合金から成るものである。
かかる本発明の摺動接点材料に於いてTi2.3〜
3.4重量％、Ｂ及びT1の少なくとも一種を合計で
0.5〜５重量％及び残部CuのCu合金とするのは、
Cuより酸化しにくいＢ及びT1の少なくとも一種
の元素を含有することにより、前記従来のTi−
Cuの酸化を抑制し、酸化Cuにより接触抵抗が高
く、不安定になるのを防止すると共に耐消耗性を
向上させる為で、Ｂ及びT1の少なくとも一種を
合計で0.5重量％未満ではその効果が無く、Ｂ及
びT1の少なくとも一種を合計で５重量％を超え
ると、刷子板材のばね性が劣化するものである。
また、Cu、Ti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。
次に本発明による摺動接点材料と従来の摺動接
点材料にて作つた刷子接点の刷子板材について説
明する。
従来の合金材料を基材とし、これにＢを添加
し、後記の表の実施例１に示す成分組成の摺動接
点材料とし、以下同様にして後記の表の左欄に示
す成分組成の本発明の実施例である摺動接点材料
と従来例の摺動接点材料にて作つた幅0.5mm、厚
さ0.15mmの刷子板材を長さ10mmに切断の上図示の
如くこの刷子板材２を１枚保持して成る刷子接点
３の刷子板材２を、外周に厚さ0.2mmのAg−Cu10
重量％より成る接点片１ａを３枚有する直径10
mm、長さ６mmの小型モータの整流子１の外周に上
下相対向するように摺接させて後記の試験条件に
て整流子の回転試験を行い、刷子接点３の刷子板
材２の消耗量と接触抵抗を測定した処、後記の表
の右欄に示すような結果を得た。
試験条件
電 圧：24V
電 流：直流100ｍＡ
整流子の回転数：2800回転／分
整流子の回転時間：500時間
刷子接点の接触力：10ｇ
The present invention relates to improvements in a brush sliding contact material (hereinafter referred to as "sliding contact material") for making a brush plate material for a brush contact that slides on the outer periphery of a commutator of a small motor. Conventionally, 2.4 to 3.4% by weight of Ti, the remainder of which has excellent hardness and spring characteristics, has been used as a sliding contact material to make the brush plate material of the brush contact that slides on the outer circumference of the commutator of small motors.
Ti-Cu consisting of Cu has been used, but Ti-Cu
However, Cu was easily oxidized, and the formation of oxidized Cu resulted in high contact resistance and instability, and the disadvantage was that wear resistance deteriorated. The present invention has been made to eliminate these drawbacks, and aims to provide a Ti--Cu based sliding contact material that has low and stable contact resistance and improved wear resistance. The sliding contact material of the present invention contains Ti2.3 to 3.4% by weight,
It consists of a Cu alloy containing at least one of B and T1 in a total amount of 0.5 to 5% by weight and the balance being Cu. In such a sliding contact material of the present invention, Ti2.3~
3.4% by weight, total of at least one of B and T1
The Cu alloy with 0.5 to 5% by weight and the balance Cu is:
By containing at least one element of B and T1, which is less oxidizable than Cu,
This is to suppress the oxidation of Cu, prevent high contact resistance and instability caused by oxidized Cu, and improve wear resistance.If the total amount of at least one of B and T1 is less than 0.5% by weight, this effect will not be achieved. If the total amount of at least one of B and T1 exceeds 5% by weight, the spring properties of the brush plate material will deteriorate. Further, by setting the content of Cu and Ti 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, brush plate materials of brush contacts made of the sliding contact material according to the present invention and the conventional sliding contact material will be explained. A conventional alloy material is used as a base material, and B is added to it to make a sliding contact material having the composition shown in Example 1 in the table below, and in the same manner, a book with the composition shown in the left column of the table below is made. A brush plate material 2 having a width of 0.5 mm and a thickness of 0.15 mm made from a sliding contact material according to an embodiment of the invention and a conventional sliding contact material is cut into a length of 10 mm as shown in the above figure. The brush plate material 2 of the brush contact 3 is made of Ag-Cu10 with a thickness of 0.2 mm on the outer periphery.
Diameter 10 with three contact pieces 1a made of 10% by weight
A rotation test of the commutator was carried out under the test conditions described below by sliding it in sliding contact with the outer periphery of the commutator 1 of a small motor with a length of 6 mm, vertically facing each other, and the amount of wear of the brush plate material 2 of the brush contact 3 When the contact resistance was measured, the results shown in the right column of the table below were obtained. Test conditions Voltage: 24V Current: DC 100mA Commutator rotation speed: 2800 revolutions/min Commutator rotation time: 500 hours Brush contact force: 10g
【表】
前記の表で明らかなように従来例の刷子接点の
刷子板材の消耗量は20〜30μｍであつたのに対
し、実施例の刷子接点の刷子板材の消耗量は10〜
15μｍで著しく減少していて耐消耗性に優れてい
ることが判る。また従来例の刷子板材では、接触
抵抗が１〜2Ωであつたのに対し、実施例の刷子
板材では接触抵抗が0.7〜0.8Ωで著しく低く安定
していることが判る。これはひとえに実施例の刷
子板材が、Cuより酸化しにくいＢ及びT1が含有
されて摺動中Cuの酸化が抑制されて、酸化Cuの
生成量が減少しているからに他ならない。
以上詳記した通り本発明の摺動接点材料は、
Ti−CuにＢ、T1が含有されて、Cuの酸化を抑制
でき、酸化Cuの生成量を減少できるので、これ
により作つた刷子接点の刷子板材は摺動中接触抵
抗が低く安定し、耐消耗量が著しく向上するとい
う優れた効果がある。[Table] As is clear from the above table, the amount of wear of the brush plate material of the brush contact of the conventional example was 20 to 30 μm, whereas the amount of wear of the brush plate material of the brush contact of the example was 10 to 30 μm.
It can be seen that the thickness decreases significantly at 15 μm, indicating excellent wear resistance. Further, it can be seen that the contact resistance of the brush plate material of the conventional example was 1 to 2 Ω, whereas the contact resistance of the brush plate material of the example was 0.7 to 0.8 Ω, which was extremely low and stable. This is simply because the brush plate material of the example contains B and T1, which are less oxidizable than Cu, suppressing the oxidation of Cu during sliding and reducing the amount of oxidized Cu produced. As detailed above, the sliding contact material of the present invention is
B and T1 are contained in Ti-Cu, which can suppress Cu oxidation and reduce the amount of oxidized Cu produced, so the brush plate material of brush contacts made with this has low and stable contact resistance during sliding, and has high durability. It has the excellent effect of significantly improving consumption.
【図面の簡単な説明】[Brief explanation of drawings]
図は小型モータの整流子と刷子接点の接触状態
を示す斜視図である。
１……整流子、１ａ……接点片、２……刷子板
材、３……刷子接点。
The figure is a perspective view showing the state of contact between the commutator and brush contacts of a small motor. 1...Commutator, 1a...Contact piece, 2...Brush plate material, 3...Brush contact.