JPS61143968A - 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 composed of an alloy material of 30 to 80% by weight, and 0.5 to 15% by weight of Cd oxide in Ag and W.
.

It is combined with a commutator or a slip ring made of a material in which at least one of V and Mo oxides is uniformly and finely dispersed in an 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 has no effect, and if it exceeds 15% by weight, the contact resistance becomes high and unstable. Furthermore, the reason why at least one oxide of W*V+Mo is uniformly and finely dispersed in an amount of 0.5 to 10% by weight is to increase the softening temperature, suppress stickiness during the rubbing operation, and improve wear resistance. Therefore, if it is less than 0.5% by weight, the effect is weak, and 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 m were each cut into lengths of 8 m.
Two brushes were arranged in parallel, one end was welded to a composite material with a width of 10 tm, a length of 13 m, and a thickness of 0.2 m, and a 2R arc-shaped contact portion was bent at the other end to make a brush. On the other hand, a slip ring with a diameter of 50 m was made by punching out a plate material with a thickness of 0.5 nm 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 shown, the brushes and slip rings of the sliding contact devices of Examples 1 to 4 have less wear than the brushes and slip rings of the conventional examples 1 and 2, respectively, and the contact resistance is low and stable. I understand. This is because the materials constituting the slip rings of the sliding contact devices of Examples 1 to 4 have the lubricating effect of Cd oxide, W, V,
Abrasion resistance is improved by suppressing adhesion by Mo oxides, and these oxides are uniformly and finely dispersed to prevent deposition (this is because 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.
5-15% by weight and at least one of the oxides of W, V, Mo
A sliding contact device comprising a commutator or a slip ring made of a material in which 0.5 to 10% by weight of seeds are uniformly and finely dispersed.