JPS58104144A - Sliding contact material - Google Patents

Abstract

PURPOSE:To obtain a sliding contact material having an enhanced hardly dissipative property while inhibiting the oxidation of an Ag-In alloy and maintaining the hardness and lubricity by adding prescribed percentages of In and one or more among Be, Na, Ca, Co, Ni, Cu, Zn, Cd, Sn, Tl and Pb to Ag. CONSTITUTION:This sliding contact material is made of an Ag-In alloy obtd. by adding 1-10wt% In and 0.5-1wt% one or more among Be, Na, Ca, Co, Ni, Cu, Zn, Cd, Sn, Tl and Pb to Ag. Since the contact material has said characteristics, the hardly dissipative property of the contact chip of the commutator of a small-sized motor formed with the contact material is enhanced. The oxidation of the Ag-In alloy is inhibited to provide low and stable contact resistance, so ununiformity in the number of revolutions of the commutator is considerably reduced.

Description

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

Conventionally, A g -I n alloy with excellent hardness and lubricity has been used as one of the sliding point materials.
-In alloy sliding contact material has the disadvantage of being easily oxidized, resulting in high contact resistance and instability. Therefore, this sliding contact material is used to manufacture all contact pieces of the outer station of the commutator of a small motor. If you do, brush! ＃The contact resistance with the outpost changes,
The rotational 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.

It is an object of the present invention to provide a large sliding material pipe with improved abrasion resistance while maintaining lubricity, and with low and stable contact resistance.

The sliding contact material of the present invention contains Inl~1ots in Ag.
and Be, Na, Ca, Co, Nl, Cu, Zn, and Cd.

At least one type of Sn, TI, Pb total o, 5-1
%.

In such a sliding contact material of the present invention, 1# is contained in Ag.
, 10'W10 Int-added, Be, N
a.

Ca+, Co, Ni, Cu, Zn, Cd, Sn, TI,
The reason why at least one type of Pb (D) is added in a total of 0.5 to 1'N10 is because these elements are more easily oxidized than In.
The contact pieces on the outer periphery of the commutator made of materials to which these elements are added are inhibited from oxidation by the A g -I n alloy, and due to the oxidation of the added elements mentioned above, Inx0y
The generation of is suppressed and the hardness of the Ag-In alloy is achieved.

This is because when lubricity is maintained and wear resistance is improved, KW contact resistance is low and stable, and if it is less than 0.5, A g
-The oxidation of the In alloy is not suppressed, and the
is generated, resulting in high contact resistance and instability.If it exceeds l-'', the characteristics such as lubricity of the Ag-In alloy will be impaired and the abrasion resistance will decrease, so in the end, the contact resistance will be 0.5 to 11- It is necessary to add

Next, a contact piece of 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 composition shown in the right column of the table below, a commutator having a diameter of 6 mm and a length of 9 mm for a small motor as shown in the drawings was prepared. On the outer periphery of the contact piece 1a, there is a layer of 0.2 w thick.
-A g-Cu-P t diameter 0.25 m
, has three brush wires 2 with a length of 105 m. Ilj
+Contact 3 was brought into sliding contact so as to face each other, and a commutator 10 rotation test was performed under the test conditions described below. When the variation in the rotational speed of the AAl2O consumption ε of the commutator l was measured, the results shown in the right column of the table below were obtained.

Test conditions Voltage: 12v Current: l) Rotation speed of CQQmA commutator: 2800rpm As is clear from the table above, the amount of wear of the contact piece of the conventional example was 3 to 6μ, while that of the contact of the example The wear amount of the piece has decreased from 1.5 to 4.0 μ, and the wear resistance is 41 to 11 tL? InAC&d”41.1*(i
lf: *Variation in rotational speed of commutator with No@dJt Fi7~101! On the other hand, it can be seen that the variation in the rotational speed of the commutator having the contact piece of the example is significantly reduced in the range of 3 to 4.5. This is simply because the contact piece of the example has a low and stable contact resistance due to suppressed oxidation of the Ag-III alloy.

As detailed above] the sliding contact material of the present invention is A g-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.

It is. Furthermore, since the oxidation of the Ag-In alloy is suppressed and the contact resistance is low and stable, there are excellent effects such as significantly reducing variations in the rotation speed of the commutator of a small motor.

[Brief explanation of the drawing]

The figure is a perspective view showing a contact type II tube between a commutator and a brush contact of a small motor. 1...Commutator, 1a...Contact piece, 2.
...Brush wire, 3...Brush! I! point. Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] In Ag, In 1 to 10 v/l and Be, Na, and Ca. Co, Ni, Cu, Zn, Cd, an, TI, pb (
D A sliding contact material containing at least one type added in a total amount of 0.5 to 11%.