JPS60187645A - Sliding contact point material - Google Patents

Abstract

PURPOSE:To provide a sliding contact point material having excellent wear resistance and stable contact resistance by adding a specific amt. of Cd and at least one kind of Al, Ca and Mn to Ag and substituting part of additive elements such as Al, Ca, Mn with an Fe group element. CONSTITUTION:Cd is added at 2-15wt% and at least one kind of Al, Ca and Mn is added at 0.5-10wt% to Ag and part of Al, Ca, Mn, etc. are substd. with an Fe group element such as Fe, Ni, Co in a 0.01-0.5wt% range. The wear resisance is improved by addition of Cd and the softening of the material during sliding is suppressed by addition of Al, Ca, Mn, etc. The finer crystal grains of the alloy are formed by addition of the Fe group elements. The sliding contact point material having excellent wear resistance and stable contact resistance is thus obtd.

Description

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

Conventionally, an Ag-Cd alloy has been used as one of the A materials for sliding contacts, but the Ag-Cd alloy softens during sliding and does not have sufficient wear resistance. When a contact piece around the commutator was manufactured and used, abrasion powder caused by sliding with the brush contact caused noise.

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 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 is made by adding more than 2% by weight of Cd and not more than 15% by weight of Cd and 0.5 to 10% by weight of at least one of AI, Ga, Mn0) to Ag.

Furthermore, A1 of the sliding contact material of the present invention. Ga, Mn-IJ
Is is added to Fe group elements (
(Fe, Ni, Co) may be substituted.

In the sliding contact material of the present invention, more than 2% by weight and less than 15% of Cd is added to Δ[in order to improve the wear resistance of Ag. However, if it exceeds 15 lXI%, the amount of oxide produced increases and the contact resistance becomes unstable. In addition, at least one of AI, Ga, and Mn is
．． 5 to IO market weight%.This is to suppress softening during sliding and improve wear resistance, and if it is less than 0.5% by weight, A.
It is difficult to suppress the softening of the g-Cd alloy, and the wear resistance does not improve, and if it exceeds 10%, the amount of oxides generated is large and the contact resistance becomes +EIi < unstable. be. Furthermore, AI, Ga.

A part of Mn is 1% in the range of 0.01 to 0.5% by weight. . When substituted with group elements (I4., Co, Ni), 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 made finer. ,0.
If it exceeds 5%, the alloy will not form and will precipitate as a single large lump in Ag, resulting in high contact resistance and large variations in contact resistance, resulting in instability.

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 compositions shown in the right column of the table below, commutation of a small motor with a diameter of 12 mm and a length of Itu+ as shown in the drawings was performed. A contact piece 1a with a thickness of 2 mm is formed on the outer periphery of the contact piece 1, and a contact piece 1a with a diameter of 0.7 mm and a length of 81 mm made of Au-Δg-Ou-1]t is formed at the bottom of the outer peripheral surface of the contact piece 1a. A rotation test of the commutator 1 using a trowel under the test conditions G described later was carried out by sliding the brush contacts 3 having the brush wire 2 so as to face each other.
When the wear amount and contact resistance of a were measured, 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 Near time Brush contact contact crab 100g (blank below) As is clear from the table above, the conventional contact JJ, no l? It can be seen that the amount of wear of the contact piece of the example is significantly reduced compared to the amount of wear, 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 significantly 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 + A material of the present invention is resistant to softening and has excellent wear resistance, so the contact piece of the commutator of a small motor made using this material will generate wear powder during sliding contact with the brush contact. There are very few noises generated, so there are excellent effects such as 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, Ia--one contact J1.2 brush wire, 3--brush contact. Applicant: Tanaka Kinki Metal Industry Co., Ltd. L: P- letter (No change to 11th) 1t Pu2 rl
li Ili r! L (Power 1 () 1981 fi
JJ 2 no 11, Kushii 11 front board 1984 special + i'r l9Ji No. 4164 f1,
Name of the invention (to 1 motion contact) 1 fee A prison 1, ?m1 U

Claims (1)

[Scope of Claims] 1) In Ag, more than 2% by weight of Cd and not more than 15% by weight, and A1. A sliding contact material containing 0.5 to 10% of market weight of at least one of Ga and Mn. 2) Some of the above AI, Ga, and Mn are o, ol~o, si
The sliding contact material according to claim 1, wherein the sliding contact material is substituted with an Fe group element within a range of %.