JPS61130443A - Sliding contact point material - Google Patents

Abstract

PURPOSE:To control the adhesive property and to improve wear resistance by adding prescribed percentages of C, Nb, In, Ba and Fe group element to Ag. CONSTITUTION:A sliding contact point material is obtd. by adding 0.1-5wt% C and 0.5-10wt% one or more among Nb, In and Ba to Ag. An Fe group element may be substituted for part (0.01-0.5wt%) of said added elements. The adhesion of the contact material during sliding action is suppressed, and the wear resistance is improved.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in sliding contact materials.

(Prior art and problems) Ag-Cd alloy has conventionally been used as one of the sliding contact materials, but Ag-Cd alloy adheres during sliding operation and does not have sufficient wear resistance. When a contact piece for the outer periphery of a commutator of a small motor is made of alloy and used, abrasion powder is generated due to the sliding action with the brush contact, causing noise.

(Object of the Invention) The present invention has been made to eliminate such drawbacks, and provides a sliding contact material that suppresses the adhesion of Ag-Cd alloy, improves wear resistance, and has low and stable contact resistance. This is what we intend to provide.

(Structure of the Invention) The sliding contact material of the present invention contains 0.1 to 5% by weight of C and 0.5 to 1% of at least one of Nb, In, and Ba in Ag.
It is made by adding 0% by weight.

In addition, some of the additive elements of the sliding contact material of the present invention are 0.01
-0.5% by weight of Fe group elements (Fe, Co.

Ni) may be substituted.

In the sliding contact material of the present invention, 0.1
~5! ! The purpose of adding i% of C is to improve the wear resistance of Ag; if it is less than 0.1% by weight, the effect will not appear, and if it exceeds 5% by weight, it will be difficult to process.

In addition, at least one of Nb, In, and Ba is added at 0.5 to 10
The reason for adding 10% by weight is that the oxides of the above elements generated during the sliding action act as lubricants and improve wear resistance. If it exceeds the range, a large amount of oxides will be generated, resulting in high contact resistance and instability. Furthermore, some of the added elements are added to 0.0
Fe group elements (Fs, C
o.

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 grains cannot be made finer, and if it exceeds 0.5% by weight, the alloy cannot be made. First, it precipitates alone in Ag as a large lump, and no further effect can be obtained.

(Embodiments and Conventional Examples) A contact piece for a commutator of a small motor made of a sliding contact material according to the present invention and a conventional sliding contact material will be described.

Using the sliding contact material according to the embodiment of the present invention and the conventional sliding contact material having the compositions shown in the left column of the table below, a commutator 1 of a small motor with a diameter of 12 mm and a length of 8 fl as shown in the drawings was used. A contact piece 1a with a thickness of 2 fl is formed on the outer periphery, and two brush wires 2 made of Au-Ag-Cu-Pt with a diameter of 0.7 tm and a length of 8 n are provided above and below the outer peripheral surface of the contact piece 1a. A rotation test was conducted on the commutator 1 under the test conditions described below with the brush contacts 3 facing each other, and the wear amount and contact resistance of the contact piece 1a were measured, as shown in the right column of the table below. I got similar results.

Test conditions Voltage: DC12V Current 7 0.6A Commutator rotation speed: 1000rpm Commutator rotation time Near time Brush contact contact crab 100g (blank below) As is clear from the table above, the conventional contact It can be seen that the amount of wear on the contact piece of the example is significantly reduced compared to the amount of wear on the piece, indicating that it has excellent wear resistance. Furthermore, it can be seen that the contact resistance of the commutator having the contact pieces of the example is lower and more stable than the contact resistance of the commutator having the contact pieces of the conventional example.

(Effects of the Invention) As detailed above, the sliding contact material of the present invention is resistant to adhesion and has excellent wear resistance. There are excellent effects such as extremely little generation of abrasion powder, therefore no noise, and low and stable contact resistance.

[Brief explanation of drawings]

The figure is a perspective view showing the state of contact between the commutator and brush contacts of a small motor. 1--Commutator, 1a--One contact piece, 2--...
Brush wire, 3-111--brush contact.

Claims (1)

[Claims] 1) 0.1 to 5% by weight of C and Nb, In, B in Ag
A sliding contact material containing 0.5 to 10% by weight of at least one of the following. 2) The sliding contact material according to claim 1, wherein a part of the additional element is substituted with an Fe group element in a range of 0.01 to 0.5% by weight.