JPS618865A - Slide contact unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sliding contact device, and particularly to materials for a brush, a commutator, or a slip ring constituting the sliding contact device.

(Prior art and problems) Conventional sliding contact devices have A u of 30 to 50% by weight, A
It is a combination of a brush made of an alloy material containing 20 to 40% by weight of G and 20 to 40% by weight of Pd, and a commutator or slip ring made of an alloy material of 5 to 15% by weight of Ag-CdO. be.

However, in this sliding contact device, the brushes tend to wear out when sliding with the commutator or slip ring, causing noise generation.

On the other hand, commutators or slip rings have high stickiness and poor wear resistance when sliding with brushes.

(Object of the Invention) The present invention has been made to eliminate such drawbacks, and aims to provide a sliding contact device that suppresses brush wear and improves the wear resistance of a commutator or slip ring. It is.

(Structure of the invention) The sliding contact device of the present invention has Au of 30 to 50% by weight.

A brush made of an alloy material containing 20 to 40% by weight of Ag and 20 to 40% by weight of Pd, and 0.5 to 5% of Cd in Ag.
15% by weight, and a commutator or slip ring made of an alloy material to which at least one of B, Si, Ge, and TI is added in an amount of 0.5 to 10% by weight.

In addition, some of the elements added to the alloy material constituting the commutary or slip ring are 0.01 to 0.5% by weight.
Fe group elements (F e + Co + N 1
) may be replaced.

In the sliding contact device of the present invention, the reason why the brush is made of the same alloy material as conventional brushes, including Au 30 = 50% by weight, Ag 20-40% by weight, and Pd 20-40% by weight, is because of its excellent corrosion resistance. This is to take advantage of the

Commutator or slin ring in Ag from 0.5~
B, St besides adding 15% by weight of Cd.

The reason why it is made of an alloy material containing 0.5 to 10% by weight of at least one of Ge and Tl is that it is made of an alloy material containing 0.5 to 10% by weight of at least one of Ge and Tl. This is to generate an appropriate amount of oxides. If it is less than 0.5% by weight, the amount of oxides generated is too small to be effective as a lubricant, and if it exceeds 10% by weight, the amount of oxides generated increases.
The contact resistance becomes high and, moreover, it becomes unstable.

Therefore, some of the elements added to the alloy material constituting the commitake or slip ring include Fe group elements (Fe, Co, etc.) in a range of 0.01 to 0.5% by weight.

When substituted with Ni), the crystal grains can be made finer and the wear resistance can be further improved; if it is less than 0.01 wt%, the effect of grain refining will not appear, and if it is more than 0.5 wt% This is a hindrance to oxides that act as lubricants.

(Example and Conventional Example) Brush wires made of an alloy material of A u 40% by weight - Ag 30% by weight - P d 30% and having a wire diameter of 0.7 mm were cut into lengths of 81111, and two wires were arranged in parallel. Width 1 at one end
0+a++.

A brush was made by welding a composite material with a length of 1311 m and a thickness of 0.2 m, and a 2R arc-shaped contact part was bent at the other end.

On the other hand, slip rings with a diameter of 50 tm were made by freeze punching plates with a thickness of 0.5 fin made of alloy materials of the examples and conventional examples having the compositions shown in the left column of the table below. Naturally
), these brushes and slip rings were combined to make a sliding contact device, each brush was brought into contact with the slip ring, and the slip ring was rotated in forward and reverse directions to perform a sliding test under the following test conditions. When we measured the wear amount and contact resistance of the slip ring, we obtained the results shown in the right column of the table below.

Test conditions Current: 0.6A Voltage: 12v Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 120-130m/min Contact crab 1
00g Sliding time 27 hours (blank below) As is clear from the table above, the brushes and slip rings of the sliding contact devices of Examples 1 to 5 are the same as the brushes and slip rings of the sliding contact devices of Conventional Examples 1 and 2, respectively. It can be seen that the amount of wear is less than that of a ring, and the contact resistance is low and stable. This is simply due to the fact that the alloy materials constituting the slip rings of the sliding contact devices of Examples 1 to 5 are B, Si, Ge, T, etc.
In addition, oxides such as Ni are generated, and this oxide acts as a lubricant, improving wear resistance.Also, since the oxide is soft, it is easily removed by sliding action, making the contact surface of the slip ring rich. This is because the contact resistance is lower due to the cleaner surface. In particular, the reason why the slip ring of the sliding contact device of Example 5 has even less wear than the slip rings of other sliding contact devices is that Fe group elements are added to the material constituting the slip ring. This is because the crystal grains are finely dispersed, which improves wear resistance.

(Effects of the Invention) As detailed above, the sliding contact device of the present invention
Compared to conventional sliding contact devices, there is less wear on brushes, commutators, or slip rings, there is almost no noise, and the contact resistance is low and stable, so it can replace conventional sliding contact devices. It can be said that it is a groundbreaking thing that can be done.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. ・11

Claims (1)

[Claims] 1) 30-50% by weight of Au, 20-40% by weight of Ag, P
A brush made of an alloy material of 20 to 40% by weight;
0.5 to 15% by weight of Cd in Ag, B, Si, Ge
A sliding contact device comprising a commutator or a slip ring made of an alloy material to which 0.5 to 10% by weight of at least one of Ti is added. 2) A part of the elements added to the alloy material constituting the commutator or slip ring is replaced with Fe group elements in a range of 0.01 to 0.5% by weight. The sliding contact device according to item 1.