JPS618869A - 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 A u of 30 to 50% by weight, A
It is a combination of a brush made of an alloy material containing g2O to 40% by weight and Pd 20 to 40% by weight, and a commutator or slip ring made of an alloy material containing 3 to 15% 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 Au of 30 to 50% by weight.

A brush made of an alloy material containing 20 to 40% by weight of Ag and 20 to 40% by weight of Pd, and 0.5 to 0.5 to 0.5% of Cd in Ag.
15% by weight and at least one of Sn and Ti from 0.5% to
It is combined with a commitake or slip ring made of an alloy material containing 10% by weight.

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 conventional brushes, which is 30 to 50% by weight of Au, 40 to 40% by weight of Ag2O, and 20 to 40% by weight of Pd, is because of its excellent corrosion resistance. This is to take advantage of the

3% by weight of commitake or slip ring in Ag
The reason why the alloy material is made of an alloy material in which 0.5 to 10% by weight of at least one of Sn and Ti is added in addition to CD exceeding 151i1iit% or less is that the adhesiveness during sliding with the brush is reduced. Improve wear resistance by suppressing
This is to make it as hard as possible, and if it is less than 0.5% by weight, it will not be able to exhibit its effect, and if it exceeds 10% by weight, the amount of oxides will increase, the contact resistance will increase, and it will become unstable. be.

Therefore, some of the elements added to the alloy material constituting the commutator or slip ring include Fe group elements (Fe; Co) 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% by weight, the effect of grain refinement will not appear, and if it is less than 0.5% by weight. Even if you exceed it, no further effect can be obtained.

(Example and conventional example) A u 40% by weight - A g 30% by weight - P d 3
Brush wires with a wire diameter of 0.7fi made of 0% by weight alloy material are cut into 8 lengths, and two wires are placed in parallel with one end having a width of 1.
0mm.

A brush was made by welding it to a base material with a length of 13111I and a thickness of 0.2n, and a 2R arc-shaped contact portion was curved at the other end.

On the other hand, a slip ring with a diameter of 5 Q mm was made by punching out a plate material with a thickness of Q and 5 mm made of alloy materials having the compositions shown in the left column of the table below. Naturally
;- Then, 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. The wear amount and contact resistance of the slip ring were measured, and the results shown in the right column of the table below were obtained.

Test conditions Current: 0.6A Voltage: 12cm Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 120~13Qm 7min contact crab 1
00g Sliding time Near time (blank below) As is clear from the table above, the brushes and slip rings of the sliding contact devices of Examples 1 to 3 are different from the brushes of the conventional sliding contact devices of 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 simply means that the alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 3 contains at least one of Sn and Ti.
The addition of seeds makes it hard and reduces adhesion during sliding.
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 3 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. This is because the crystal grains 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.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Italy

Claims (1)

[Claims] 1) 30-50% by weight of Au, 20-40% by weight of Ag, P
A brush made of an alloy material of 20 to 40% by weight;
Cd in Ag is more than 3% by weight and less than 15% by weight, and Sn
A sliding contact device comprising a commutator or a slip ring made of an alloy material to which at least one of Ti is added in an amount of 0.5 to 10% by weight. 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.