JPS618885A - sliding contact device - 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 slip ring made of an alloy material containing 0.5 to 15% by weight of Ag-Cd.

However, in this sliding contact device, the brushes tend to wear out when sliding with the commitake 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 containing 30 to 80% by weight of Ag, 0.5 to 15% by weight of Cd in Ag, B, and Si.
.

At least one of Ge and Tl in an amount of 0.5 to 10ffi%
It is constructed by combining a commutator or a slip ring made of an alloy material.

In addition, some of the elements added to the alloy material constituting the commitake or slip ring are 0.01 to 0.5 M%.
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, which has 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.

Commitake or slip ring in Ag from 0.5~
B, Si besides adding 15% by weight of Cd.

The reason why it is made of an alloy material containing 0.5 to 10% by weight of at least one of Ge and Tl is to suppress stickiness during sliding with the brush and improve wear resistance.
This is to generate an appropriate amount of oxide as a lubricant, 0.5% by weight.
If it is less than 10% 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. .

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 less than 0.5 wt% If it exceeds the amount, it becomes a problem for the oxide that acts as a lubricant.

(Example and Conventional Example) Brush wire rods made of an alloy material of P d 60% by weight - A g 40% by weight, wire diameter Q, 7 m in length are each cut into lengths of 8 wires, two wires are placed in parallel, and one end is cut into widths of 10 mm. A brush was made by welding a part, 13 m long, and 0.2 mm thick to a composite material, and forming a 2R arc-shaped contact part at the other end. On the other hand, a slip ring with a diameter of 501111 mm was made by punching out a 0.5 m+ plate made of alloy materials having the compositions shown in the left column of the table below. Therefore, a sliding contact alarm 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 Circumferential speed: 120~13Qm/min Contact crab
100g 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 simply due to the fact that the alloy materials constituting the slip rings of the sliding contact devices of Examples 1 to 5 are B, Si, Ge, T, etc.
Furthermore, oxides such as Ni are generated, and these oxides act as lubricants, improving wear resistance, and this is because the amount of oxides generated during sliding is in balance 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 grains are finely dispersed and the wear resistance is improved.

(Effects of the Invention) As detailed above, the sliding contact device of the present invention has a brush brush, a commutator or a
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. in MZ

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 0.5 to 10% by weight of at least one of B, Si, Ge, and Tl. 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.