JPS58104136A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having an enhanced hardly dissipative property while inhibiting an increase in the contact resistance of an Ag- Zn alloy due to oxidation and maintaining the sulfurization resistance and lubricity by adding prescribed percentages of Zn and one or more among Pt, Ru and Pd to Ag. CONSTITUTION:This sliding contact material is made of an Ag-Zn alloy obtd. by adding 1-10wt% Zn and 0.5-2wt% one or more among Pt, Ru and Pd to Ag. Since the contact material has said characteristics, the hardly dissipative property of the contact chip of the commutator of a small-sized motor formed with the contact material is remarkably enhanced. An increase in the contact resistance of the Ag-Zn alloy due to oxidation is inhibited to provide low and stable contact resistance, so variance in the number of revolutions of the commutator is considerably reduced.

Description

[Detailed description of the invention] This patent relates to improvements in sliding contact materials.

Sulfide resistant as one of the sliding contact materials.

Ag-Zn alloys with excellent lubricity have been used, but sliding contact materials made of Ag-Zn alloys have the disadvantage of being easily oxidized, resulting in high contact resistance and instability. When the outer circumferential contacts and pieces of the commutator of a small motor are manufactured and used from materials, the contact resistance with the brush contacts changes, and the commutator's rotational speed varies widely and becomes unstable and sharp.

The present invention has been made to eliminate such drawbacks.
, completely suppresses the increase in contact resistance due to oxidation of the Ag-Zn alloy, improves wear resistance while maintaining sulfidation resistance and lubricity,
Furthermore, the present invention aims to provide a sliding contact material with low and stable contact resistance.

The sliding contact material of the present invention contains a total of 0.5 to 10 pieces of Zn and at least one of Pt, Ru, and Pd in Ag.
~2-It is made by adding. .

In the sliding contact material of the present invention, 1 to 1
In addition to adding Zn@- of 0'W10, Pt and Ru.

At least one type of Pd in a total of 0.゛5-2- The reason why these elements are added is that the contact piece on the outer periphery of the commutator made of a material to which these elements are added suppresses the increase in contact resistance due to oxidation in the Ag-Zn alloy, and This is because the sulfidation resistance and lubricity of the alloy are maintained, the wear resistance is improved, and the contact resistance is low and stable.
The increase in contact resistance due to melting in the g-Zn alloy is not suppressed, and the contact resistance is high and unstable due to the formation of ZnO, and when it exceeds 2W10, it becomes difficult to process, and the This will impair properties such as sulfidation resistance and lubricity, and reduce wear resistance. J0.5~2v1
It is necessary to add

Next, a W voice piece of a commutator for a small motor made of a sliding contact material according to the present invention and a conventional sliding contact material will be explained.

Using the sliding contact material according to the embodiment of the present invention and the conventional sliding contact material having the compositions shown in the right column of the table below, the diameter &u and length of a small motor are determined as shown in the drawings. If #6 piece 1a of thickness ρ, 2I on the outer periphery of commutator l of U, t2 square shape Ili! 2 sins, this? , above and below the outer peripheral surface of the four pieces 1a, a diameter + consisting of A u -A g-Cu-P t
2. "IIIJI, 3 brush wires 2 with a length of 1vm
A rotation test was performed on the commutator 1 under the test conditions described below, with the brush contacts 3 facing each other in sliding contact.
When we measured the amount of wear of a and the variation in the rotational speed of commutator l, we obtained the results shown in the right column of the table below.

Test conditions Voltage: 12v Current: DC5QmA Commutator rotation speed: 2800rl) mAs is clear from the table above, the amount of wear of the contact piece of the conventional example was 5 to 7μ, while that of the contact of the example Piece consumption tia, 5~5
It can be seen that there is a significant decrease in μ, indicating that the wear resistance is excellent. Furthermore, it can be seen that the variation in the rotational speed of the commutator having the conventional contact piece is decreasing. This is simply because the contact resistance of the la point piece of the example is suppressed from increasing due to oxidation in the Ag--Zn alloy, and the contact resistance is low and stable.

The sliding contact material of the present invention described in detail above is Ag-Z
Since the increase in contact resistance due to oxidation of the n-alloy is suppressed, and the sulfur resistance and lubricity are maintained, the wear resistance of the W and pieces of the first element of a small motor made by kneading is significantly improved. It is. Further, since the increase in contact resistance due to oxidation of the Ag-Zn alloy is suppressed and the contact resistance is low and stable, there are excellent effects such as significantly reducing variations in the rotation speed of the commutator of a small motor.

[Brief explanation of the drawing]

The figure is a perspective view showing the state of contact between the commutator and brush contacts of a small motor. 1... Commutator, la... Contact piece, 2...
...Brush wire, 3...Brush contact. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] In Ag, Zn l ~10- and at least -St of Pt, Ru, and Pd are added in the sum of 05 to 2'N10.1. A sliding contact material made of