JPS6134140A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material hardly causing agglutination and having superior wear resistance by adding specified percentages of Cu, Cd, Mn, In, Sn, Sb, P, Ti and Zr to Ag. CONSTITUTION:The sliding contact material having low and stable contact resistance as well as reduced agglutination and improved wear resistance is obtd. by adding 3-12wt% Cu, 0.1-5wt% Cd, 1-7wt% Mn and 0.5-5wt% at least one among In, Sn, Sb, P, Ti and Zr to Ag. When a part of the added elements, is substituted with 0.01-0.5wt% Fe group element such as Fe, Ni or Co crystal grains are made fine and the wear resistance can be improved further.

Description

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

(Conventional technology and problems) Ag-Cd alloy has traditionally 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 on the outer periphery of a small morph commutator is made of Cd alloy and used, abrasion powder is generated due to the rubbing action with the brush contact, which causes noise generation.

(Object of the invention) The present invention has been made to eliminate such drawbacks,
The object of the present invention is to provide a sliding contact material that suppresses the adhesion of Ag-Cd alloys, improves wear resistance, and has low and stable contact resistance.

(Structure of the Invention) The sliding contact material of the present invention contains 3 to 12% by weight of Cu, 0.1 to 5% by weight of Cd, 1 to 7% by weight of Mn, In, Sn + S b + P + T
It is made by adding at least one of t and Zr in an amount of 0.5 to 5% by weight.

Further, some of the additive elements of the sliding contact material of the present invention are 0.
Fe group element (Fe.

Ni, Co) may be substituted.

In the sliding contact material of the present invention, 0.1
3-12 wt% C in addition to adding ~5 wt% Cd
The purpose of adding u is to increase the hardness of the Ag-Cd alloy and improve its wear resistance.If it is less than 3% by weight, the effect will not appear, and if it exceeds 12% by weight, a large amount of oxides will be produced. This results in high contact resistance and instability. Also 1
The reason for adding up to 7% by weight of Mn is to increase the adhesion resistance and wear resistance of the A-g-cd alloy, and if it is less than 1% by weight, the effect will not appear, and 7% by weight. If it exceeds 4F acid.

The amount of material produced increases, resulting in high contact resistance and instability. Furthermore, In, Sn, Sb, 'P.

The reason for adding a small amount of Ti and Zr (both 0.5 to 5% by weight is that oxides of the above elements generated during the sliding action act as a lubricant and improve wear resistance. If it is less than 5% by weight, it will not be possible to suppress the adhesion of the Ag-Cd alloy and the wear resistance will not improve, and if it exceeds 5% by weight, the amount of oxide generated will be large, resulting in high contact resistance and instability. Furthermore, when a part of the above-mentioned additive elements is replaced with Fe group elements (Fe, Ni, Co) in the range of 0.01 to 0.5% by weight, 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 crystal grains cannot be refined, and if it exceeds 0.5% by weight, it will not alloy and will precipitate as a single large lump in Ag, resulting in high contact resistance and This results in large variations and instability.

(Example and Conventional Example) Using a sliding contact material according to an embodiment of the present invention and a conventional sliding contact material having the compositions shown in the right column of the table below, a small motor with a diameter of 12fi and a length as shown in the drawings was used. 8fi commutator 1
A contact piece 1a with a thickness of 2n is formed on the outer periphery of the contact piece 1a, and two brush wire rods 2 made of Au-Ag-Cu-PL with a diameter of 0.7 m and a length of 8 mm are placed 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 in sliding contact, and the wear amount and contact resistance of the contact piece 1a were measured. The results shown in the column were obtained.

Test conditions Voltage: DC12V Current: 0.6A Commutator rotation speed: 1000rpm Commutator rotation time Near time Brush contact contact crab 100g As is clear from the table above, the wear amount of the conventional contact piece It can be seen that the amount of wear of the contact piece of the example is significantly reduced compared to that of the example, indicating that the contact piece of the example 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, so the contact piece of the commutator of a small motor made using this material has sliding action with the brush contact. There are excellent effects such as extremely little generation of abrasion powder, 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--one brush wire,
3---One brush contact.

Claims (1)

[Claims] 1) 3 to 12% by weight of Cu and 0.1 to 0.1 to 12% by weight of Cd in Ag
5% by weight and 1 to 7% by weight of Mn, In, Sn, Sb,
A sliding contact material containing 0.5 to 5% by weight of at least one of P, Ti, and Zr. 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.