JPS5887242A - Sliding contact material - Google Patents

Abstract

PURPOSE:To reduce the abrasion loss of the resulting sliding contact material and to make the contact resistance low and uniform by adding specified amounts of Mn and >=1 kind of element selected from Si, Zr, Bi, Ge and Ga to Ag. CONSTITUTION:This sliding contact material has a composition prepared by adding 1-10wt% Mn and 0.1-3wt% in total of >=1 kind of element selected from Si, Zr, Bi, Ge and Ga to Ag or further adding 0.01-5wt% Fe group metal.

Description

[Detailed description of the invention] The present invention relates to improvements in sliding contact materials.

Conventionally, A has excellent sulfidation resistance as one of the sliding WA materials.
Ag-Mn alloy has been used, but since ki-Mn alloy has low hardness and poor wear resistance, this Ag-Mn alloy has been used.
When the contact piece for the outer periphery of the commutator of a small motor is made of alloy and used, abrasion powder is generated due to contact with the brush contact.
This was causing noise. Also, this A g -M
Since the n-alloy contact piece is easily oxidized, has a high contact resistance, and is unstable, the contact resistance with the brush contact changes, and the rotation speed of the commutator varies widely and becomes unstable.

The present invention has been made to eliminate such drawbacks,
The object is to increase the hardness of the Ag-Mn alloy, improve wear resistance, suppress oxidation, and stabilize contact resistance at a low level to provide a large sliding contact material.

One of the sliding contact materials of the present invention contains 1 to 1 Mn in Ag.
0''N10 and 81.A total of 0.1 to 31% of Zr, Bi, Ge, and Ga are added.

Another one of the sliding 19-point materials of the present invention is M in Ag.
n 1-10% and Si, Zr, former, Ge, Ga
at least one kind in total of 0.1 to 3'N10, and Fe
It is made by adding 0.01 to 0.5 "y".

In the sliding contact material of the present invention, 1 to 1 in 1 g
The reason for adding 0-Mnl is to improve the sulfidation resistance of Ag, and if it is less than 1-1, the effect will not appear, and 10'''
If it exceeds 10, the amount of oxide produced increases, resulting in high contact resistance and instability. Also Si, Zr, Bi, G
e, adding at least one type of Ga in a total of 0.1 to 34% is to disperse eutectic precipitates of the above elements and Ag in addition to the solid solution of Ag and Mn, and improve the hardness of Ag-Mn. This is to increase the hardness of Ag-Mn and improve the wear resistance. Abrasion resistance did not improve, 3
If it exceeds 'N10, the number of precipitated eutectic particles with Ag increases and the particles become oxidized, resulting in high contact resistance and instability. Furthermore, the K Fe group is 0. O1~0
, 5'N10 is added to refine the crystal grains and improve wear resistance.If the percentage is less than 0.01"75, the grains cannot be made finer, and if it exceeds 40.5w10, the alloy will not form.
It precipitates as a single large lump 9 in the interior, resulting in high contact resistance and large variations, making it unstable.

Next, 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 explained.

Using the sliding contact material according to the embodiment of the present invention and the conventional sliding contact material having the composition shown on the right side of the table below, a small motor with a diameter of 6 m and a length of 9 cm was commutated as shown in the drawing. A contact piece 1a with a thickness of 0.25 m is formed on the outer periphery of the contact piece 1, and on the upper and lower sides of the outer circumferential surface of this contact piece 1 m, wires made of gold-silver wire platinum alloy with a diameter of 0.25 m and a length lO■ Three brush wires 2
A contact test was conducted under the test conditions described below by sliding the brush contacts 3 having the brush contacts 3 facing each other, and measuring the amount of wear of the discarded 1a and the variation in the number of rotations of the commutator 10. The results shown in the right column of the table were obtained.

Test conditions Voltage: 12V Current: 60mA DC Commutator rotation speed: 2800 rpm Commutator rotation time: 500 hours Contact crab of sliding contact 5g/3 pieces) As is clear from the table above, the conventional contact The consumption amount of the piece is 5
~6μ, whereas the contact piece of the example had a surface resistance of 2μ.
It can be seen that the wear resistance is significantly reduced at ~3μ, indicating that the wear resistance is excellent. Furthermore, while the variation in the rotation speed of the commutator with the contact piece of the conventional example was 7 to 10 inches, the variation in the rotation speed of the commutator with the contact piece of the example was significantly reduced to 3 to 4%. I can see that you are doing it.

As detailed above, the sliding contact material of the present invention has high hardness and excellent wear resistance, so the contact piece of the commutator of a small motor made using this material generates wear powder during sliding contact with the brush contact. Therefore, no noise is generated. In addition, since oxidation is suppressed and the contact resistance is low and stable, it has excellent effects such as significantly reducing variations in the rotation speed of the commutator of small motors.

[Brief explanation of the drawing]

The figure is a perspective view showing the state of contact between the commutator and brush contacts of a small Tanabata. 1...Commutator, 1a...Contact piece, 2.
...Brush wire, 3...Brush contact. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Mn1-10-, Si, Zr, and Bl in Ag. A sliding contact material containing at least one of Ge and Ga added in a total of 0.1-3/). 2) 1-10% Mn and 8i, Zr, Bl in Ag
. A total of 0.1-3/and Fe with a small amount of Ge and Ga
A sliding contact material made by adding 0.01 to 0.5W10 of the group.