JPS61143963A - 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 such drawbacks, and aims to provide a sliding contact device that suppresses brush wear and improves the wear resistance of the commutator or slip ring. be.

(Structure of the invention) The sliding contact device of the present invention contains 20 to 70% by weight of Pd.

A brush made of an alloy material containing 30 to 80% by weight of Ag, and 0.5 to 15% by weight of Cd oxide in Ag and B.

At least one of Si, Ge, and TI oxides in an amount of 0.5 to
It is combined with a commutator or a slip ring made of a material in which 10% by weight is uniformly and finely dispersed.

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 warmth and wear resistance of Ag. If it is less than 0.5% by weight, there is no effect, and if it exceeds 15% by weight, the contact resistance becomes high and unstable. Furthermore, the reason why at least one of the oxides of BI St+ Ge and Ti is uniformly and finely dispersed at 0.5 to 10% by weight is to increase the softening temperature, suppress stickiness during the rubbing operation, and improve wear resistance. So, 0.5% by weight
If it is less than 10% by weight, the effect is weak, and if it exceeds 10% by weight, processing becomes difficult.

(Example and Conventional Example) Brush wire rods with a wire diameter of 0.7 m made of an alloy material of P d 60 wt % - A g 40 wt % are each cut into lengths of 8 fi, two wires are arranged in parallel, and one end is made with a width of 10 wire. , length 13fi,
A brush was made by welding it to a 0.2 m 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 inch 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 = 100Orpm Peripheral speed: 120~130m/min Contact crab 100g Sliding time near time (below the margin) As shown in the table above As shown, the brushes and slip rings of the sliding contact devices of Examples 1 to 5 have less wear compared to the brush and slip ring of the sliding contact devices of Conventional Examples 1 and 2, respectively, and the contact resistance is low and stable. I understand. This is because the material constituting the slip ring of the sliding contact devices of Examples 1 to 5 has the lubricating effect of Cd oxide and the B, st
This is because the abrasion resistance is improved by suppressing adhesion by the oxides of , ce+TI, and because these oxides are uniformly and finely dispersed and do not accumulate, the contact resistance is low and stable.

(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 the conventional sliding contact device, and the contact resistance is low and stable. It can be said that it can replace the 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.
A slip ring formed by combining a commutator or a slip ring made of a material in which 5 to 15% by weight and at least one of the oxides of B, Si, Ge, and Ti are uniformly and finely dispersed in an amount of 0.5 to 10% by weight. Contact device.