JPS61143970A - 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 (Field of Industrial Application) The present invention relates to a sliding contact device, and particularly to a combination of a brush material and a commutator or slip ring material constituting the same.

(Prior art and problems) Conventional sliding contact devices contain 20 to 70% by weight of Pd and 3% Ag.
A brush made of 0 to 80% by weight alloy material, and Ag
- It is combined with a commutator or slip ring made of an alloy material containing 0.5 to 15% by weight of Cd.

However, this sliding contact device exhibits high stickiness during sliding operation and has poor abrasion resistance.

(Object of the Invention) The present invention has been made to eliminate these 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 contains 20 to 70% by weight of Pd.

A brush composed of an alloy material of 30 to 80% by weight, and 0.5 to 15% by weight of Cd oxide in Ag and I
It is combined with a commutator or slip ring made of a material in which n and Sn oxides are uniformly and finely dispersed in a total amount of 0.5 to 10% by weight.

In the sliding contact device of the present invention, the reason why the brush is made of the same alloy material as conventional brushes, which is 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, is to take advantage of its excellent corrosion resistance.

In addition, in the composition of the commutator or slip ring material, the reason why 0.5 to 15% by weight of Cd oxide is uniformly and finely dispersed in Ag is to increase the lubricity and improve the wear resistance of Ag. If it is less than 0.5% by weight, it will not have this effect (and if it exceeds 15% by weight, the contact resistance will be high and it will become unstable. Furthermore, 0.5 to 10% by weight of In and Sn oxides are added with a needle. % is uniformly and finely dispersed to increase the softening temperature and suppress adhesion during the rubbing operation to improve abrasion resistance, but if it is less than 0.5% by weight, the effect will be weak.
If it exceeds 10% by weight, processing becomes difficult.

(Example and Conventional Example) Brush wire rods made of an alloy material of 60% by weight of Pd and 40% by weight of Ag and having a wire diameter of 0.7 MIA were each cut into lengths of 8fi, and two wires were placed in parallel with one end having a width of 10mm and a length of 10mm. Sa13fi,
A brush was made by welding it to a 0.2 mm thick composite material and bending a 2R arc-shaped contact part at the other end. On the other hand, slip rings with a diameter of 50 mm were made by punching out 0.5 m thick plates made of the materials of the example (by internal oxidation method) and the conventional example having the component compositions shown in the left column of the table below. Therefore, a sliding contact device was made by combining these brushes and slip rings, each brush was brought into contact with the slip ring, and the slip ring was rotated in forward and reverse directions to conduct a friction test under the following test conditions to determine the wear of the brushes and slip rings. When the amount and contact resistance were measured, the results shown in the right column of the table below were obtained.

Test conditions Current: 0.6A Voltage: DC12V Load: Resistance load Rotation speed: 11000rpm Peripheral speed: 120~130m/min Contact crab 100g Sliding time near time (below the margin) Clear from the table above As can be seen, the brushes and slip rings of the sliding contact devices of Examples 1 to 3 have less wear than the brushes and slip rings of the conventional examples 1 and 2, respectively, and the contact resistance is low and stable1. I understand. This is because the materials constituting the slip rings of the sliding contact devices of Examples 1 to 3 have improved wear resistance due to the lubricating effect of Cd oxide and the suppression of adhesion by In and Sn oxides. This is because the oxide is uniformly and finely dispersed and does not accumulate, resulting in low and stable contact resistance.

(Effects of the Invention) As detailed above, the sliding contact device of the present invention has less wear on the brush, commutator, or slip ring than conventional sliding contact devices, and also has low (stable) contact resistance. It can be said that it can replace the conventional sliding contact device.

Claims (1)

[Claims] A brush made of an alloy material containing 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, and 0.0% of Cd oxide in Ag.
5 to 15% by weight and a total of 0.5% of In and Sn oxides
A sliding contact device combined with a commutator or a slip ring made of a material in which ~10% by weight is uniformly and finely dispersed.