JPS60200930A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain the titled material having low and stable contact resistance by adding specified percentages of Cd and Cr, Mg, Zr or P to Ag so as to inhibit the welding of an Ag-Cd alloy and to improve the wear resistance. CONSTITUTION:This sliding contact material is obtd. by adding 0.5-15wt% Cd and 0.1-5wt% one or more among Cr, Mg, Zr and P to Ag. The softening and welding of an Ag-Cd alloy during sliding are inhibited, the wear resistance is improved to remove a cause for the generation of noise, and the formation of oxide is inhibited to make the contact resistance low and stable. In the alloy composition of the sliding contact material, 0.01-0.5wt% Fe group element such as Fe, Ni or Co may be substituted for part of one or more among Cr, Mg, Zr and P.

Description

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

Ag-Cd alloy has traditionally been used as one of the sliding contact materials, but Ag-Cd alloy softens during sliding and does not have sufficient wear resistance. When a contact piece around the outer periphery of the brush contact piece was manufactured and used, abrasion powder was generated due to sliding with the brush contact point, which caused noise generation.

The present invention has been made to eliminate such drawbacks,
It is an object of the present invention to provide a pulsating contact material which suppresses the adhesion of Ag-Cd alloy, improves wear resistance, and has low and stable contact resistance.

The sliding contact material of the present invention contains 0.5 to 1 Cd in Ag.
5% by weight and 0.1 to 5% by weight of at least one of Cr, Mg, Zr, and P.

Further, Cr, Mg, and Zr of the sliding contact material of the present invention.

■) 0. O may be substituted with an F6 group element (Fe, Ni, Co) in a range of 1 to 0.5% by weight.

In the sliding contact material of the present invention, 0.5
The reason for adding ~15% by weight of Cd is to improve the wear resistance of Ag; if it is less than 0.5% by weight, the effect will not appear, and if it exceeds 15% by weight, a large amount of oxides will be produced. Cr, M
The reason for adding 0.1 to 5% by weight of at least one of g, Zr, and P is to suppress softening during sliding and improve wear resistance.If it is less than 0.1% by weight, the Ag-Cd alloy will soften. If it exceeds 5% by weight, a large amount of oxides are generated, resulting in high contact resistance and instability. Furthermore, Cr, Mg, and Zr.

Fe in the range of 0.01 to 0.5% by weight of l)
When substituted with group elements (1□゛e, Co, Ni), the crystal grains can be made finer and the wear resistance can be further improved, and if it is less than 0.01% by market weight, the crystal grains cannot be made finer. zu, 0
．． If the content exceeds 5%, alloying will not occur, and it will precipitate as a single large lump in Ag, resulting in high contact resistance and instability with large variations.

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 H material having the compositions shown in the right column of the table below, a small motor with a diameter of 12a+m and a length of 8Illff is used as shown in the drawing.
A contact piece 1a having a thickness of 2111+ is formed on the outer periphery of the positive commutator 1, and Au-Ag is applied above and below the outer peripheral surface of this contact piece 1a.
Brush contacts 3 having two brush wires 2 made of -Cu-PL with a diameter of 0.7'wm and a length of 8mm are brought into sliding contact so as to face each other, and a commutator 1 is formed under the test conditions described later. After conducting a rotation test and measuring the wear amount and contact resistance of the contact piece 1a,
The results shown in the right column of the table below were obtained.

Test conditions Voltage: DC12V Current: 0.6A Commutator rotation speed: 1000rpm Commutator rotation time = 7 hours Contact crab of brush contact 100g (blank below) As is clear from the table above, the conventional example It can be seen that the amount of wear of the contact pieces of the example is significantly reduced compared to the amount of wear of the contact pieces, indicating that the contact pieces of the example have 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.

As detailed above, the sliding contact material of the present invention is resistant to softening and has excellent wear resistance, so the contact piece of a small morph commutator made using this material generates abrasion powder when sliding contact with a brush contact. It has excellent effects such as very little noise, therefore no noise, and low and stable contact resistance.

[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-----m commutator, 1a-----one contact piece, 2-
-11--Brush wire, 3--1 brush contact. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Engraving of the drawings (no change in content) 3. Procedural amendment (method) % formula % 1. Indication of the case Patent Application No. 57736 filed in 1982. 2. Name of the invention Sliding contact material 3. Person making the amendment 4, Date of amendment order (q June 26, 1980 5, Subject of amendment Drawings

Claims (1)

[Claims] 1) 0.5 to 15% by weight of Cd and Cr, Mg in Ag
A sliding contact material containing 0.1 to 5% by weight of at least one of Zr and P. 2> Some of the above Cr, Mg, Zr, and P are 0.01 to 0.
The sliding contact material according to claim 1, characterized in that the element is substituted with F e h element in a range of 5% by weight.