JPS60133612A - Slide contact unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding contact device, and particularly to improvements in the materials of the brush and commutator or slip ring that constitute the same.

Conventional sliding contact devices have Au 18-22% by weight l
) j3-7% by weight, Pd43-47% by weight, Ag2
A brush made of 8-32% by weight alloy material and Ag
- It is combined with a commutator or slip ring made of an alloy material containing 0.5 to 15% by weight of Cd.

By the way, the brush of this sliding contact device has poor wear resistance when sliding with the commutator or slip ring, and easily generates abrasion powder, which causes noise generation.

On the other hand, the commutator or slip ring is Ag-Cd
It was composed of an alloy material of 0.5 to 15% by weight, and had high adhesiveness and poor abrasion resistance when sliding with a brush.

The present invention has been made to eliminate such drawbacks, and aims to provide a sliding contact device in which the wear resistance of the brush is improved and the wear resistance of the commutator or slip ring is improved. .

The sliding contact device of the present invention has Au of 18 to 22% by weight.

PL3-7% by weight, Pd43-47% by weight, A, g28
0.5% of at least one of Nb, In, Ba, C, and d is added to ~32% by weight of the alloy material without changing the composition ratio.
A brush made of an alloy material containing ~10% by weight and 3~12% by weight of Ag-Cu or 3~12% by weight of Ag-Cu.
It is combined with a commutator or slip ring made of an alloy material containing 5% by weight or less of Cd.

Note that Nb is added to the alloy material constituting the brush.

Part of In, Ba, and Cd may be replaced with Fe group elements (Fe, Co, Ni) in a range of 0.01 to 0.5% by weight.

In the sliding contact device of the present invention, the brush is made of Au18-2
2% by weight, 'pt 3-7% by weight, Pd43-47
Consisting of an alloy material with 0.5 to 10 weight % of at least one of Nb, In, Ba, and Cd added to an alloy material of 28 to 32 weight % Ag without changing the composition ratio. The reason for this is to generate an appropriate amount of oxides that act as lubricants in order to improve the wear resistance of the Au-Pt-Pd-Ag alloy material, and if it is less than 0.5% by weight, the amount of oxides generated is small. Te/1g! Unable to demonstrate its effectiveness as a lubricant, 10
If it exceeds the weight percentage, the amount of oxides generated increases, the contact resistance becomes high, and the contact resistance becomes unstable.

Commutator or slip ring, Ag Cu3~1
2% by weight or 3-12% by weight of Ag-Cu-5% by weight of Cd
The reason why it is made of the following alloy material is to suppress the adhesion during sliding with the brush and improve wear resistance.If the Cu content is less than 3% by weight, this effect cannot be obtained. If the Cd content exceeds 5% by weight, the amount of oxide generated during sliding will be too large, resulting in high and unstable contact resistance.If the Cd content exceeds 5% by weight, when this becomes oxidized Cd, the contact resistance will increase. This increases the wear resistance and deteriorates the wear resistance. Therefore, C
The content of u is 3 to 12% by weight, and the content of Cd is 5% by weight.
It was designed not to exceed.

Therefore, Nb added to the alloy material constituting the brush,
When a part of In, Ba, and Cd is replaced with Fe group elements (Fe, Co, Ni) in the range of 0.01 to 0.5% by weight, the crystal grains can be made finer and wear resistance is further improved. If it is less than 0.01% by weight, the effect of crystal grain refinement will not appear, and if it exceeds 0.5% by weight, it will become a hindrance to the oxide that acts as a lubricant.

Next, specific embodiments and conventional examples of the sliding contact device according to the present invention will be described.

Brush wire rods with a wire diameter of 0.7 fin made of alloy materials of the example and conventional example shown in the left column of Table 1 below are each cut into lengths of 8 lengths, and two wires are placed in parallel and one end is cut in width. 10am, length 13, welded to a 0.2mm thick base material, 2R on the other end
A brush was made by bending the arc-shaped contact part of the brush. On the other hand, a slip ring with a diameter of 50 pieces was made by punching out a plate material having a thickness of Q and 5+++i and made of alloy materials of the examples and conventional examples having the composition shown in the right column of Table 1 below. Therefore, a sliding contact device was made by combining these brushes and slip rings, and a sliding test was conducted under the following test conditions by bringing each brush into contact with the slip ring and rotating the slip ring in forward and reverse directions. The wear amount and contact resistance were measured, and the results shown in Table 2 below were obtained.

Test conditions Current: 0.6 A Voltage = 12 Load: Resistance Load Rotation speed: 1000 rpm Circumferential speed: 120-130 m/min Contact crab
, 100g Sliding time near h (blank below) Table 2 As is clear from Table 2 above, the brushes and slip rings of the sliding contact devices of Examples 1 to 5 are the same as those of conventional examples 1 and 2, respectively. It can be seen that the amount of wear is significantly lower than that of the contact brush and slip ring, and the contact resistance is equally low and stable. This is simply because the alloy material constituting the brush of the sliding contact devices of Examples 1 to 5 is Nb, In, and B during sliding.
Oxides such as a, Cd, and even Ni are generated, and these oxides act as lubricants, improving wear resistance.Since the oxides are soft, they are easily removed by sliding action, and the contact surface of the brush is It is because it becomes truly pure. Especially Example 5
The reason why the brushes of the sliding contact device of 2.1 and 2.0 have less wear compared to the brushes of the sliding contact device of other embodiments is that Fe group elements are added to the material that makes up the brush, making the crystal grains finer. This is because it is dispersed and has improved wear resistance. In addition, this is because the Cu alloy material that constitutes the slip ring of the sliding contact devices of Examples 1 to 5 suppresses the increase in stickiness during sliding and improves wear resistance. .

As detailed above, the sliding contact device of the present invention has significantly superior wear resistance of the brush and commutator or slip ring compared to conventional sliding contact devices, generates extremely little wear powder, and generates no noise. It can be said to be an epoch-making device that can replace conventional sliding contact devices.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 1) Au 18-22% by weight, Pt 3-7% by weight
, Nb, In, and Ba are added to an alloy material containing 43 to 47% by weight of Pd and 28 to 32% by weight of Ag without changing the composition ratio.
. A brush made of an alloy material containing 0.5 to 10% by weight of at least one type of Cd;
A sliding contact device comprising a commutator or a slip ring made of an alloy material of 3 to 12% by weight of Ag-Cu and 5% by weight of Cd or less. 2) Nb added to the alloy material constituting the brush. 2. The sliding contact device according to claim 1, wherein a portion of In, Ba, and Cd is substituted with an Fe group element in a range of 0.01 to 0.5% by weight.