JPS5887243A - Sliding contact material - Google Patents

Abstract

PURPOSE:To provide a superior hardly consumable property to the resulting sliding contact material and to make the contact resistance of the material low and stable by adding specified amounts of In and >=1 kind of element selected from Al, Cr, Y, Zr, Sb and Ta to Ag. CONSTITUTION:This sliding contact material is obtd. by adding 1-10wt% In and 0.5-1wt% in total of >=1 kind of element selected from Al, Cr, Y, Zr, Sb and Ta to Ag.

Description

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

Conventionally, Ag-In alloys with excellent hardness and lubricity have been used as one of the sliding contact materials.
Alloy sliding contact materials have the drawbacks of being easily oxidized, resulting in high contact resistance and instability. # When a point piece was manufactured and used, the contact resistance with the brush contact changed, and the rotation speed of the commutator varied widely and became unstable.

The present invention was made in order to eliminate such drawbacks, and suppresses oxidation of Ag-In alloy and improves hardness.

The purpose of this invention is to provide a sliding contact material that maintains lubricity, improves wear resistance, and has low and stable contact resistance.

The sliding contact material of the present invention contains In l~101 in Ag.
6 and AI, V, Cr, Y, Zr, 8b, and Ta (D) are added in a total amount of 0.5 to 1'W7.

In the sliding contact material of the present invention, 1 to 1
In addition to 0% In, AI and V were added.

A total of 0 of at least one of Cr, Y, Zr, 8b, and Ta
, 5~lW/ is added because these elements are more easily oxidized than In, so contact pieces on the outer periphery of the commutator made of materials to which these elements are added are made to prevent oxidation in Ag-In alloys. Is the oxidation of the added elements suppressed? ),
This is because the formation of InO2 is suppressed, the hardness and lubricity of the kg-In alloy are maintained, the wear resistance is improved, and the contact resistance is low and stable. The oxidation of In
O2 is generated and the contact resistance becomes high and unstable, and if it exceeds 1-, the hardness and lubricity properties of the Ag-In alloy are lost and the wear resistance decreases, so eventually 0.5-. I
Addition of W7 is necessary.

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.

As shown in the drawing, a small motor with a diameter of 6W and a length of 9U is prepared using the sliding contact material of the embodiment of the present invention and the conventional sliding contact material having the component compositions shown in the mt on the right of the table of Kenji. Commutator 1
A 1 m contact piece with a thickness of 0.2 m is formed on the outer periphery of the contact piece 1a, and Au-Ag-Cu-P is placed above and below the outer peripheral surface of the contact piece 1a.
Diameter 0.25 Ila made of t-based alloy Length 1 (l
A contact test was carried out under the redistribution test conditions by sliding the brush contacts 3 having three brush wires 2f of ag so as to face each other, and the amount of wear of the contact pieces 11 and the variation in the rotation speed of the commutator 1 were investigated. When I measured it, I got the results shown on the right side of the dividend restoration table.

Test conditions Voltage = 12v Current: DC59mA Commutator rotation speed: 2800rpm Commutator rotation time: 500 hours Sliding contact 0 contact force: 5g/3 pieces As is clear from the table above, the conventional contact Q piece depletion amount F
It can be seen that the wear amount of the contact and φ pieces of the example was significantly reduced in the amount of wear Fi2 to Jμ, whereas the wear amount of the contact and φ pieces in the example was significantly reduced, indicating excellent wear resistance. Furthermore, the variation in the rotation speed of the commutator with the contact piece of the conventional example was 7 to 10-1, whereas the variation of the rotation speed of the commutator with the contact piece of the embodiment was 3 to 4.
It can be seen that it decreases significantly at 9G. This is simply because the contact piece of the example has low and stable contact resistance due to the suppressed oxidation of the Ag-In alloy.

As detailed above, the sliding contact material of the present invention is 5Afl-I.
Since the oxidation of the n-alloy is suppressed and the hardness and lubricity are maintained, the wear resistance of the commutator contact pieces of small motors made using this method is significantly improved. 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 motor. 1... Commutator, la... Contact piece, 2...
...Brush wire, 3...Brush contact. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] A sliding contact material made by adding In1=10''/g and at least one of AI, Or, Y, Zr.