JPS618882A - 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 the materials of the brush and commitake or slip ring constituting the sliding contact device.

(Prior art and problems) Conventional sliding contact devices have P d of 20 to 70% by weight, A
A brush made of an alloy material of 30 to 80% by weight;
It is combined with a commutator or a sling ring made of an alloy material containing Ag-Cd 0.005 to 15% by weight.

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, the commutator or slip ring had high adhesiveness (poor wear resistance) when sliding with the brush.

(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 a Pd of 20 to 70% by weight.

A brush composed of an alloy material containing 30 to 80% by weight of Ag, 5 to 15% by weight of Cd in Ag, Cr,
Mg.

It is combined with a commutator or slip ring made of an alloy material containing at least one of Zr and P in an amount of 0.1 to 5 M%.

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.
It is also possible to substitute Fe group elements (Fe, Co, Ni) within the following range.

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

Commutator or slip ring in Ag from 0.5 to
Ct, Mg besides adding 15% by weight of Cd.

The reason why it is made of an alloy material containing 0.1 to 5 M% of at least one of Zr and P is to increase the softening temperature during sliding with the brush and improve wear resistance. .1
If it is less than 5% by weight, the effect cannot be exhibited, and if it exceeds 5% by weight, the amount of oxide generated increases, resulting in high contact resistance.
Moreover, it is unstable.

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

When substituted with Ni), the crystal grains can be made finer and wear resistance can be further improved. If it is less than 0.01% by weight, the effect of grain refinement will not appear, and if it is more than 0.5% by weight, the effect of grain refinement will not appear. However, no further effect can be obtained.

(Example and Conventional Example) Brush wire rods made of an alloy material of P d 60 wt % - A g 40 wt % and having a wire diameter of 0.7 + m are each cut into lengths of 8 wires, and two wires are arranged in parallel and one end is cut into width IQmi. , 13 cranes long,
A brush was made by welding to a composite material with a thickness of 0.2 mm and bending a 2R arc-shaped contact portion at the other end. On the other hand, a slip ring with a diameter of 501 m was made by punching out a plate material having a thickness of Q and 5 mm and made of alloy materials having the compositions shown in the left column of the table below. 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 the wear amount and contact resistance of the ring were measured, the results shown in the right column of the table below were obtained. Test condition type Current: 0.6A Voltage: 12v Load: Resistance load Rotation speed: 1000rpm Peripheral speed: 120~13Qm 7min contact crab 1
00g Sliding time = 7 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 different from the brushes 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 slip ring, and the contact resistance is low and stable. This is because the alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 5 is a sliding material whose softening temperature during sliding is increased by the addition of at least one of Cr, Mg, Zr, and P. This is because it suppresses adhesion during sliding, improves wear resistance, and balances the amount of oxides generated during sliding with the amount of wear. 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, and the crystal This is because the particles are finely dispersed, which improves wear resistance.

(Effects of the Invention) As described in detail above, the sliding contact device of the present invention has a brush brush, a commutator, and an I.
Since the wear of the slip ring is small, there is almost no noise generation, and the contact resistance is low and stable, it can be said to be an epoch-making device that can replace the conventional sliding contact device.

Claims (1)

[Claims] 1) A brush made of an alloy material containing 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, and 0.5 to 0.5 to 100% of Cd in Ag.
15% by weight and a commutator or slip ring made of an alloy material containing 0.1 to 5% by weight of at least one of Cr, Mg, Zr, and P. 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.