JPS618868A - 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) The conventional sliding contact device is composed of 30 to 50% by weight of Au and 2% of Ag.
It is a combination of a brush made of an alloy material containing 0 to 40% by weight of M and 20 to 40% by weight of Pd, and a commutator or slip ring made of an alloy material containing 0.5 to 15% by weight of Ag-Cd. .

However, in this sliding contact device, the brushes tend to wear out when sliding with the commitake 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 0.5 to 0.5% of Cd in Ag.
15% by weight, and a commutator or slip ring made of an alloy material containing 0.5 to 10% by weight of at least one of Sb, Te, Pb, Be, As, and Zn. be.

In addition, some of the elements added to the alloy material constituting the commitake 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 is that it has an alloy material of 30 to 50% by weight of Au, 20 to 40% of Ag: 40 to 40% by weight of PD2O, and has excellent corrosion resistance. This is to take advantage of the

Commutator or slip ring in Ag from 0.5 to
Besides adding 15% by weight of Cd, Sb, Te.

0.5 to 1 of at least one of Pb, Be, As, and Zn
The reason why it is made of an alloy material containing 0% by weight is that it suppresses stickiness when sliding with the brush and improves wear resistance.
This is to generate an appropriate amount of oxides that act as lubricants to improve properties.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, oxidation will occur. The amount of substances generated increases, the contact resistance increases, and furthermore, it becomes unstable.

Therefore, some of the elements added to the alloy material constituting the commutator or slip ring include Fe group elements (Fe, Co, etc.) in the 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% by weight and each having a wire diameter of 0.7 m were cut into lengths of 81111, and two wires were placed in parallel and one end was cut. The width I
Qmi.

Welded to a composite material with a length of 13 mm and a thickness of 0.2 m, and 2R on the other end.
A brush was made by bending the arc-shaped contact part of the brush.

On the other hand, examples of component compositions shown in the left column of the table below and □? A plate material with a thickness of 0.5+n made of a conventional alloy material is
1) A slip ring with a diameter of 50 mm was made by punching. Therefore, a sliding contact device was made by combining these brushes and slip rings, and a sliding test was conducted under the following test conditions by bringing each brush into contact with the slip ring and rotating the slip ring in forward and reverse directions. When we measured the amount of wear and contact resistance, we obtained the results shown in the right column of the table below.

Test conditions Current: 0.6A Voltage: 12cm Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 120-130m/min Contact crab 10
0g Sliding time Near time (blank below) As is clear from the table above, the brushes and slip rings of the sliding contact devices of Examples 1 to 7 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 material constituting the slip ring of the sliding contact devices of Examples 1 to 7 is Sb, Te, Pb,
Se.

Oxides of As, Zn, and even Ni are generated, and these oxides are /12I/! The oxide is soft, so it is easily removed by sliding action.
This is because the contact surface of the slip ring is always clean and the contact resistance is low. In particular, the reason why the slip ring of the sliding contact device of Example 7 has even less wear than the slip rings of other sliding contact devices is that the F″e group element is added to the material making up the slip ring. This is because the crystal grains are finely dispersed and the wear resistance is improved.

(Effects of the Invention) j As detailed above, the sliding contact device of the present invention has less wear on the brush and commitake or slip ring compared to conventional sliding contact devices, generates almost no noise, and Since the contact resistance is also low and stable, it can be said to be an epoch-making device that can replace conventional sliding contact devices.

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;
0.5-15% by weight of Cd in Ag, Sb, Te, P
0.5 to 10 of at least one of b, Be, As, and Zn
A sliding contact device consisting of a commutator or a slip ring made of an alloy material containing % by weight. 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.