JPH0259207B2 - - 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,
Alloy materials consisting of 0.1 to 1% by weight of Pt, 42 to 44% by weight of Pd, 39 to 41% by weight of Ag, and 15.5 to 17.5% by weight of Cu were widely used (Kogyo Nichi Nichi Shimbun on July 8, 1966). (See page 30 of New Contact Materials edited by the Japan Electronic Materials Technology Association, published by the Japan Electronic Materials Technology Association). This alloy material has particularly excellent properties such as mechanical strength, corrosion resistance, and spring properties, and with this in mind, it is made with limited elements and contents such as Pt, Pd, Ag, and Cu. It is. 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 uses the above-mentioned alloy material as a base material and adds a small amount of a specific material to it, uses the generated oxide as a lubricant, and improves wear resistance. It is an object of the present invention to provide a sliding contact material for a brush that has a high quality. The sliding contact material for brushes of the present invention has a composition ratio of
Pt-Pd-Ag-Cu with Pt0.1~1wt%, Pd42~44wt%, Ag39~41wt%, Cu15.5~17.5wt%
95 to 99.5% by weight, and the balance is a total of 0.5 to 5% by weight of at least one of Sb, Mo, Pb, and Zn. In the sliding contact material for brushes of the present invention, the composition ratio is 0.1 to 1% by weight of Pt, 42 to 44% by weight of Pd, and 39 to 41% of Ag.
wt%, Cu15.5-17.5 wt% Pt−Pd−Ag−Cu
is 95-99.5% by weight and the balance is Sb, Mo, Pb and Zn
The reason why the total amount of at least one of these is 0.5 to 5% by weight is to generate an appropriate amount of oxides that act as lubricants in order to improve the wear resistance of the conventional alloy materials. If the total amount of at least one of these is less than 0.5% by weight, the amount of oxide generated will be small and the lubricant will not be effective.
A total of 5 types of at least one of Mo, Pb and Zn
If it exceeds % by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable. In addition, by setting the contents of Pt, Pd, 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 loss. It is something. Next, a conventional alloy material is used as a base material, and Sb is added thereto to obtain a brush sliding contact material having the composition shown in Example 1 in the table. Brush wire rods with a wire diameter of 0.7 mm were made using sliding contact materials for conventional brushes and conventional sliding contact materials for brushes, each of which 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 10 mm. 13mm, 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: 130-120m/min Contact force: 100g Test time: 7 hours

[Table] As is clear from the above table, it can be seen that the brush contacts of Examples 1 to 15 had significantly less wear than the conventional brush contacts, and the contact resistance was 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 15, generates oxides such as Sb, Mo, Pb, and Zn during sliding. This is because the substance acts as a lubricant and improves wear resistance. Moreover, since the oxide is soft, it can be easily removed by sliding action, so the contact resistance remains unchanged. 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.

Claims (1)

[Claims] 1 Pt with composition ratio of 0.1 to 1% by weight, Pd 42 to 44% by weight, Ag 39 to 41% by weight, Cu 15.5 to 17.5% by weight
-Pd-Ag-Cu is 95 to 99.5% by weight and the balance is Sb,
At least one of Mo, Pb and Zn in total of 0.5~
A sliding contact material for a brush, characterized in that the content is 5% by weight.