JPH0252699B2 - - Google Patents

Description

[Detailed description of the invention]

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,
An alloy material consisting of 69-71% by weight of Au, 4-6% by weight of Pt, 9-11% by weight of Ag, 13-15% by weight of Cu, and 0.5-1.5% by weight of Ni was widely used (July 8, 1966).
(See page 30 of New Contact Materials, edited by Japan Electronic Materials Technology Association, published by Kogyo Nichi Nichi Shimbun, Inc.). This alloy material has excellent properties such as mechanical strength, corrosion resistance, and spring properties, and especially Au, Pt
Corrosion resistance by Ag, Pt, Cu, spring properties by Cu,
Focusing on the mechanical strength, castability, and processability of Ni, Pt, and Au, Au, Pt, Ag,
It is made by limiting elements such as Cu and Ni and their contents. 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
Au69~71wt%, Pt4~6wt%, Ag9~11wt%, Cu13~15wt%, Ni0.5~1.5wt% Au—
Pt-Ag-Cu-Ni is 92-98.5% by weight and the balance is
The composition contains 1.0 to 5.0% by weight of Zn and a total of 0.5 to 3.0% by weight of at least one of Si, Zr, Bi, Ge, and Ga. In the sliding contact material for brushes of the present invention, the composition ratio of Au is 69 to 71% by weight, Pt is 4 to 6% by weight, Ag is 9 to 11% by weight, Cu is 13 to 15% by weight, and Ni is 0.5 to 1.5% by weight.
-Pt-Ag-Cu-Ni is 92 to 98.5% by weight and the balance is
The reason why Zn is 1.0 to 5.0% by weight and at least one of Si, Zr, Bi, Ge, and Ga is 0.5 to 3.0% by weight in total is that Zn is added to the casting process in order to improve the wear resistance of the conventional alloy material. Improves the flow of hot water, and
This is to refine the crystal grains by using at least one of Si, Zr, Bi, Ge, and Ga. Here, Si,
Zr, Bi, Ge, and Ga do not reduce each other's effects, so they can be used alone or in combination of two or more. Furthermore, Zn and Si, Zr, Bi,
This is to increase hardness through the synergistic effect of the combined addition of at least one of Ge and Ga.
If Zn is less than 5% by weight or if at least one of Si, Zr, Bi, Ge and Ga is less than 0.5% by weight in total, the effect cannot be exhibited, and if Zn is more than 5% by weight or if at least one of Si, Zr, Bi, Ge and Ga is contained in If the total amount of at least one type of Ga exceeds 3% by weight, the amount of oxides generated will increase, the contact resistance will increase, and furthermore, it will become unstable. Also, Au, Pt, Ag,
By setting the content of Cu and Ni 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 Zn and Zn are added to it.
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 each having a wire diameter of 0.7 mm were made using the materials, and each of these was cut to a length 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 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: 130-120m/min Contact force: 100g Test time: 7 hours

【table】

[Table] As is clear from the above table, it can be seen that the brush contacts of Examples 1 to 17 had significantly less wear than the conventional brush contacts, and that the contact resistance was low and stable.
This is because the brush sliding contact material of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 17, is hardened by Zn and at least one of Si, Zr, Bi, Ge, and Ga. This is because the wear resistance is 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 sliding contact materials.

Claims (1)

[Claims] 1 Composition ratio: Au69-71% by weight, Pt4-6% by weight,
92-98.5 wt% Au-Pt-Ag-Cu-Ni with 9-11 wt% Ag, 13-15 wt% Cu, 0.5-1.5 wt% Ni
and the balance is Zn1.0~5.0% by weight, Si, Zr, Bi, Ge
and at least one type of Ga in a total of 0.5 to 3.0% by weight
A sliding contact material for a brush, characterized in that: