JPS6029438A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material with improved welding resistance by adding a specified amount of Si and Zr to an alloy material prepd. by blending specified percentages of Pd and Ag. CONSTITUTION:A sliding contact material for a brush contact is obtd. by adding 0.5-5wt% in total of Si and Zr to an alloy material consisting of 30-70wt% Pd and 30-70wt% Ag without changing the ratio in the composition. The wear resistance can be improved furthermore by substituting 0.01-0.5wt% Fe group metal for part of the Si and Zr. The sliding contact material produces little dust owing to wear, hardly generates noise, and has contact resistance comparable to that of a conventional sliding contact material.

Description

[Detailed description of the invention] The present invention relates to improvements in sliding contact materials.

Conventionally, various materials have been used as sliding contact materials, and in particular, alloy materials consisting of 30 to 70% by weight of P d and 30 to 70% by weight of Ag have been widely used as materials for brush contacts.

However, since the brush contacts made of this alloy material have low hardness, they tend to cause adhesion when sliding with the commutator, and abrasion particles are likely to be generated, causing noise generation.

The present invention has been made in order to eliminate such drawbacks, and provides a sliding contact that uses the above-mentioned alloy material as a base material and adds a specific material to it to increase hardness and improve adhesion resistance. The aim is to provide materials.

The sliding contact material of the present invention contains 30 to 70% by weight of Pd.

An alloy material consisting of 30 to 70% by weight of A g is combined with St and 7.0% by weight without changing its composition ratio. r in total from 0.5 to 5
It is made by adding % by weight.

In the sliding contact material of the present invention, P d 30-70M
Without changing the composition ratio, a total of 0.5 to 0.5 to 0.5 to 70% of Si and Zr is added to an alloy material consisting of 30 to 70 weight % of Ag.
The reason why 5% by weight is added is to modify the hardness of the alloy material in order to improve its adhesion resistance.If it is less than 0.5% by weight, the effect cannot be exhibited, and if it exceeds 5% by weight, This results in an increased amount of oxides, increased contact resistance, and instability.

In addition, the reason why a part of the Si and Zr is replaced with Fe group metal in the range of 0.01 to 0.5% by weight is to refine the crystal grains and further improve the wear resistance.
．． If it is less than 0.01% by weight, the effect of grain refinement will not appear,
This is because even if it exceeds 0.5% by weight, no further effect can be obtained.

Next, using the sliding contact material according to the present invention and the conventional sliding contact material having the compositions shown in the left column below, brush wire rods each having a wire diameter of 0.7 mm were made, and each brush wire rod was cut into 8 fins in length. Two of them are placed in parallel and one end has a width of 10m, a length of 13 fins, and a thickness of 0.2+n.
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 disk-shaped commutator, and the commutator was rotated in forward and reverse directions to perform a sliding test 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: 0.6A Voltage: 12cm Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 130-120m/min Contact crab
100g Test time: 7 hours (blank below) As is clear from the table above, the brush contacts of Examples 1 to 3 had significantly less wear than the conventional brush contacts, and the contact resistance was equally low and stable. I know that there is. This is simply because the sliding contact material of the present invention, which constitutes the brush wire of the brush contacts of Examples 1 to 3, has increased hardness and adhesion resistance due to the addition of Si and Zr. . In particular, the reason why the amount of wear of the brush contact of Example 3 is even smaller than that of the brush contacts of Examples 1 and 2 is that Fe group metal is added to the sliding contact material of the present invention that constitutes the brush wire. This is because the crystal grains have become finer and more dispersed, further improving wear resistance.

As detailed above, according to the sliding contact material according to the present invention,
It has significantly superior wear resistance compared to conventional sliding contact materials, generates extremely little abrasion powder, generates almost no noise, and has contact resistance equivalent to that of conventional sliding contact materials. This has the effect of providing a brush contact point.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Adding a total of 0.5 to 5% by weight of St and Zr to an alloy material consisting of 30 to 70% by weight of Pd and 30 to 70% by weight of Ag without changing the composition ratio. A sliding contact material made of 2> 1 part of the Si and Z r (7) is 0.01 to 0.
Sliding contact material according to claim 1, in which the Fe group metal is replaced in the range of 5% by weight.