JPS58110648A - Sliding contact material - Google Patents

Abstract

PURPOSE:To provide a sliding contact material of german silver which is suppressed of oxidation, is stabilized to low contact resistance and is improved in consumption resistance by contg. limited compsn. contents of B, Si, Ge, Tl, etc. in german silver. CONSTITUTION:A titled material is a sliding contact material wherein 0.5-5wt% total of >=1 kind among B, Si, Ge, Tl are added to german silver without changing the compsn. ratios thereof. With addition of elements such as the above- mentioned B, Si, Ge, Tl, and the like which are harder to oxidize than Cu, the oxidation of Cu is suppressed, and the increasing and unstabilizing of contact resistance by the oxide of Cu are prevented. Further, consumption resistance is improved by said addition. The reasons for limiting the total content of >=1 kind among the above-mentioned B, Si, Ge, Tl lie in that if below 0.5%, there is no effect of the addition and at >=5%, the spring characteristic of the brush wire material to be made from the sliding contact material is deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a sliding contact material for making a brush plate material of a brush contact that slides into contact with a commutator outer station of a small motor.

Conventionally, nickel silver (Cu54-5
81. Nil&5-19.5. Although nickel silver has been used, it has the disadvantages that it tends to form ridges, has high contact resistance and becomes unstable due to the oxidized M, and has poor abrasion resistance.

The present invention has been made to overcome these drawbacks, and aims to provide a nickel silver-based sliding contact material that has low and stable contact resistance and improved wear resistance.

The sliding contact material of the present invention is made by adding a total of 0.5 to 5% by weight of at least one of B, Ge, Si, and TI to nickel silver without changing its composition ratio.

In such a sliding contact material of the present invention, B and S are added to the nickel silver.
At least one of i, Ge, TI in total of 0.5～～
The reason for adding 5 parts by weight is to suppress the oxidation of Cu and prevent the oxidized Cu from becoming unstable due to its high contact resistance. At the same time, the purpose is to improve the abrasion resistance. If the weight is less than α5, there is no effect, and if it exceeds α5, the springiness of the brush wire will deteriorate.

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.

Widths of 0.0 mm were made from the sliding contact material of the embodiment of the present invention and the conventional sliding contact material having the component compositions shown in the left column of the table with edges.
5 wg, 0.15 m thick brush plate material pipe cut into length 10 cm As shown in the above figure, the brush plate material 2 of the brush contact 3 is made by holding one brush plate material 2.
A contact piece 1a consisting of -CulQ weight % was brought into sliding contact with the outer periphery of a commutator l of a small motor with a diameter of 10 wm and a length of 6 times, vertically facing each other, under the test conditions described below. A commutator rotation test was performed, and the brush plate material 2 of the brush contact 3
The wear amount and contact resistance were adjusted and the results shown in the right column of the table below were obtained.

Test conditions Voltage: 24 VS, Current: DCl 00 mA, Commutator rotation speed: 2800 rpm% Commutator rotation time: 500 hours, Brush contact O contact crab 10 was compared to the conventional brush contact brush as shown in the table above. The amount of consumption of the plate material is 40 to 50μ
On the other hand, the wear of the brush plate material of the brush contact point in the example was significantly reduced by 1. It can be seen that it has excellent wear resistance. Further, while the conventional brush plate material had a probe resistance of 1 to 2 Ω, the contact resistance of the brush plate material of the example was 0.75 to 0.85 Ω, which was found to be extremely low and stable. This simply means that the brush plate material in the example is
B and Si are more difficult to oxidize than Cu.

This is because the addition of Ge and TI suppresses the oxidation of Cu during sliding, reducing the amount of Cu oxide produced.

As described above in detail, the sliding contact material of the present invention is made of German silver and B.
, 8j, Ge, and TI are added to suppress the oxidation of Cu and reduce the amount of oxidized Cu, so the brush plate material of the brush contact made with this has a low sliding contact material and stable wear resistance. It has the excellent effect of significantly improving

[Brief explanation of drawings]

FIG. 2 is a perspective view showing a state of contact between a commutator and a brush contact of the small motor. l...Commutator, la...Contact piece, 2.
-...Brush plate material, 3-...Brush contact. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] Nickel silver, without changing its composition ratio (, B, 8i.
Sliding contact material made of additives.