JPS618881A - 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) 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 composed of a commutator or a slip ring made of an alloy material containing 1 to 15% by weight of Ag-Cd.

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, 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 a Pd of 20 to 70% by weight.

A brush composed of an alloy material of 30 to 80% by weight, Cd in Ag of more than 1% by weight and 15% by weight or less, and at least one of Nb, In, and Ba of 0.5 to 10f.
It is combined with a commitake or slip ring made of an alloy material containing i amount %.

In addition, some of the elements added to the alloy material constituting the commutator 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 reason why the brush is made of the same alloy material as the conventional brush with P d of 20 to 70% by weight and Ag of 30 to 80% by weight is to take advantage of its excellent corrosion resistance. .

1% by weight of commutator or slim ring in Ag
In addition to adding Cd exceeding 15i% or less, Nb, I
The reason why it is made of an alloy material containing a small amount of n and Ba (0.5 to 1% of each type added) is that it is a lubricant that suppresses stickiness when sliding with the brush and improves wear resistance. This is to generate an appropriate amount of oxide that will act as an agent.
If it is less than 5% by weight, the amount of oxide generated is small and it cannot be effective as a lubricant, and if it exceeds 10% by weight, the amount of oxide generated is large, resulting in high contact resistance and instability. It is something.

Therefore, some of the elements added to the alloy material constituting the commutator or slip ring include Fe group elements (Fe, Co, etc.) in a 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 with a wire diameter of 0.1 m made of an alloy material of 60% by weight of Pd and 40% by weight of Ag were each cut into lengths of 3iii, and two wires were placed in parallel with one end having a width of 10+am and a length of 13th day,
A brush was made by welding a 0.2 m thick composite material and forming a 2R arc-shaped contact portion at the other end. On the other hand, a slip ring with a diameter of 50111 was made by punching out a plate material having a thickness of Q and 5+u made of alloy materials of the embodiments and conventional examples having the compositions shown in the left column of the table below. However, these blocks
t'1 A sliding contact device is made by combining a brush and a slip ring, each brush is brought into contact with the slip ring, and a sliding test is performed under the following test conditions by 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 Flow: 0.6A Voltage: 12■ Load: Resistance load Rotational speed: 1000rpm Circumferential speed: 120-130m/min Contact crab 100g Sliding time Near time (blank below) As shown in 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 brush and slip ring of the sliding contact devices of Conventional Examples 1 and 2, and the contact resistance is low and stable. I know that there is. This is simply because the alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 4 generates oxides such as Nb, In, Ba, and even Ni during sliding, and these oxides act as ia lubricants. This is because the wear resistance is improved and the amount of oxides generated during sliding is balanced with the amount of wear.

In particular, the reason why the slip ring of the sliding contact device of Example 4 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 detailed above, the sliding contact device of the present invention
Compared to conventional sliding contact devices, the amount of wear on the brush and commutator or slot/knob ring is less, there is almost no noise, and the contact resistance is low and stable, so it can replace conventional sliding contact devices. It can be said that it is a groundbreaking thing.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. ← γ

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 1% by weight of Cd in Ag.
A sliding contact device comprising a commutator or a slip ring made of an alloy material containing more than 15% by weight or less and 0.5 to 10% by weight of at least one of Nb, In, and Ba. 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.