JPS58107451A - Material for slide contact - Google Patents

Abstract

PURPOSE:To provide a slide contact material of which sulfurization resistance is enhanced and contact resistance is stabilized at a low level without losing oxidation resistance of an Ag-Cu alloy, by respectively adding Cu and one kind of more of V, Cr, Sn and In to Ag in a predetermined ratio. CONSTITUTION:This slide contact material is constituted from an Ag-Cu alloy obtained by adding 1-10wt% Cu, 0.5-2wt% one kind or more V, Cr, Sn and In and additional 0.01-0.5wt% Fe group element to Ag. Because this slide contact material has aforementined characteristics and high hardness and excellent anti- wear property, the contact element of the rectifier of a small motor prepared by using this material generates no abraded powder when is slid with a brush contact point and therefore generates no noise.

Description

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

A with excellent conductivity as one of the 11th sliding materials
g-Cu alloy has been used, but since Ag-Cu alloy has poor sulfidation resistance, this Ag-Cu alloy is used to fabricate and use a contact piece around the commutator of a small motor. Since the contact resistance is high and unstable, the contact resistance with the brush contact changes, and the rotation speed of the commutator varies widely, making it unstable.

The present invention has been made to eliminate such drawbacks,
It is an object of the present invention to provide a sliding contact material that has improved sulfidation resistance without impairing the oxidation resistance of the Ag-Cu alloy and has low and stable contact resistance.

One of the sliding contact materials of the present invention contains 1 to 1 Cu in Ag.
0 weight and at least one of V, Cr, Sn, and Ir1D are added in total of 0.5 to 2 weight.

In addition, another one of the sliding*, a materials of the present invention is C in Ag.
u1-10 weight--, at least one of V, Cr, 8n, and In in total of 0.5-2 weight--, and Fe group 0.01-0.
5 weight by weight.

In the sliding contact material of the present invention, 1 to 1
The reason for adding 0 weight of Cut is to improve the wear resistance of Ag, and if it is less than 1 weight, the effect will not appear.
If it exceeds 10% by weight, the amount of oxide produced increases, resulting in high contact resistance and instability. Also V, Cr, 8n
The reason for adding a total of 0.5 to 2 wt. This is to improve the sulfidation resistance of Ag-Cu without causing any damage. If it is less than 0.5% by weight, the sulfidation resistance will not improve, and if it exceeds 3% by weight,
g - This is to inhibit the lubricity of Cu and improve the wear resistance. If it is less than 0.01 weight, the crystal grains cannot be refined, and if it exceeds 0.5 weight, it will not be alloyed, and in Ag. It precipitates as a single large lump, 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.

The sliding contact material of the embodiment of the present invention and the conventional sliding contact material having the component compositions shown in the right column of the table below have a diameter of 6I and a length of 10mm as shown in the drawing. A junction piece 1a with a thickness of 0.2N is formed on the outer periphery of the commutator l of J, and this! 1 scrap 1a
Three brush wire rods 2 made of Au-Ag-Cu-Pt with a diameter of 9.25 m and a length of 10IIj are placed above and below the outer peripheral surface of the
The brushes 1 and 3 having the brushes 1 and 3 are brought into contact with each other so as to face each other,
A rotation test of the commutator 1 was conducted under the test conditions described later, and the wear amount of the contact piece 1a and the variation in the number of rotations of the commutator 10 were measured, and the results shown on the right side of the table described later were obtained.

Test conditions Voltage: 12V Current: DC5QmA Commutator rotation speed: 280 (lrpm) Commutator rotation time: 500 hours The wear amount of the contact crab 5t/3 point piece of the brush contact decreased by 2 to 4μ. It can be seen that it is hard and wear resistant.The variation tk of the 0 rotation speed of the commutator with the contact piece of the conventional example was 7.5 to 10-, whereas the ! It can be seen that the variation in the rotational speed of the disused commutators is significantly reduced in the 2nd to 4th samples.

As detailed above, since the sliding M point material of the present invention has high hardness and excellent wear resistance, the contact piece of the commutator of a small motor made using this material can be used during WJ contact with the brush contact. No abrasion powder is generated, so no noise is generated. Furthermore, since sulfidation is suppressed and the contact resistance is low and stable, it has the excellent effect of 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 motor. 1... Commutator, la... Contact piece, 2...
...Brush wire, 3...Brush contact. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) %Cu1-10% by weight in Ag and V, CrSn, I
Sliding II made by adding at least four kinds of n in a total of 0.5 to 2% by weight! Point material. 2) KN Cu 1''' 10 weight in Ag and V, C
A total of 0.5 to 2 weight of at least one of rSn and In.
and Fe group to 0. Sliding 1 made by adding 1 to 0.5 O by weight
1. ! material.