JPS618884A - 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) The conventional sliding contact device contains 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, 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 contains 20 to 70% by weight of Pd.

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, Sb, and T.
e.

0.5 to 1 of at least one of Pb, Se, As, and Zn
This is a combination of a commutator or a slip ring made of an alloy material containing 0% 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 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.

Commutator or slip ring in Ag from 0.5 to
Besides adding 15% by weight of Cd, Sb, Te.

0.5 to 1 of at least one of Pb, Se, As, and Zn
The reason for using an alloy material containing 0.0% by weight is to generate an appropriate amount of oxide that acts as a lubricant to suppress stickiness during sliding with the brush and improve wear resistance. 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 refined and the wear resistance can be further improved. If the content is less than o, oi weight%, the effect of crystal grain refinement will not appear, and if it exceeds 0.5 weight%. This is a hindrance to oxides that act as lubricants.

(Example and Conventional Example) Brush wires with a wire diameter of 0.7 mm made of an alloy material containing 60% by weight of Pd and 40% by weight of Ag were cut into 8-piece lengths, and two wires were placed in parallel, with one end having a width of 10-pieces. A brush was made by welding it to a base material with a length of 13 members and a thickness of 0.2 m, and a 2R arc-shaped contact part was bent at the other end. On the other hand, 0.5 mm thick plates made of alloy materials of the embodiments and conventional examples having the compositions shown in the left column of the table below were punched out to produce 50 mm diameter, 7 mm diameter plates. However, a sliding contact device was made by combining a brush and a slip ring, and a sliding test was conducted under the following test conditions by bringing each brush into contact with the slip ring, rotating the slip ring forward and backward, and performing a sliding test under the following test conditions. When the amount of wear and contact resistance of the brush and slip ring was 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: 120-130m/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 7 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 may simply be the alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 7, or Sb, Te,
Pb, Se.

Oxides such as As, Zn, and even Ni are generated, and these oxides act as lubricants, improving wear resistance, and the amount of oxides generated during sliding is balanced with the amount of wear. None other than that. In particular, the reason why the slip ring of the sliding contact device of Example 7 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.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. to

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 with addition of 0.5 to 10% by weight of at least one of Sb, Te, Pb, Se, As, and Zn. Device. 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.