JPH0354812B2 - - Google Patents

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, commutator, or slip ring constituting the sliding contact device. Conventional sliding contact devices are made of Au60.5~64.5% by weight,
A combination of a brush made of an alloy material containing 27 to 31% Ag and 6.5 to 10.5% Cu, and a commutator or slip ring made of an alloy material containing 0.5 to 15% Ag-Cd. It is. By the way, the brush of this sliding contact device adheres to the commutator or the slip ring when sliding, has poor wear resistance, and tends to generate abrasion powder, which causes noise generation. On the other hand, a commutator or slip ring is
It was composed of an alloy material containing 0.5 to 15% by weight of Ag-Cd, and had high stickiness 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 a composition ratio of Au60.5~
Au-Ag-Cu of 64.5% by weight, 27-31% by weight of Ag, 6.5-10.5% by weight of Cu, and 95-99.5% by weight of at least one of W, V and Ta, the balance being 0.5-5% in total
A brush made of an alloy material consisting of % by weight;
Ag-Cu3~12wt% or Ag-Cu3~12wt%-
It is combined with a commutator or slip ring made of an alloy material containing 5% by weight of Cd or less. In the sliding contact device of the present invention, the composition ratio of the brush is 60.5 to 64.5% by weight of Au, 27 to 31% by weight of Ag,
The reason why the alloy material is composed of 6.5 to 10.5 weight % of Cu, 95 to 99.5 weight % of Au-Ag-Cu, and the balance of 0.5 to 5 weight % of at least one of W, V, and Ta in total is as follows. In order to improve the wear resistance of the Au-Ag-Cu alloy material, the curing temperature is raised to improve the adhesion resistance during sliding, and if it is less than 0.5% by weight, the effect cannot be achieved. If it exceeds % by weight, the amount of oxides generated will increase, contact resistance will increase, and furthermore, it will become unstable. Also Au, Ag, Cu
By setting the content within a range that does not change the composition ratio of the conventional alloy material, the characteristics of the conventional alloy material can be exhibited without being impaired. Commutator or slip spring, Ag-
The reason why it is made of an alloy material containing less than 3 to 12 weight % Cu or 3 to 12 weight % Ag-Cu and 5 weight % Cd is to suppress the stickiness when sliding with the brush and improve wear resistance. If the content of Cd is less than 3% by weight, the effect cannot be obtained, and if it exceeds 12% by weight, the amount of oxide generated during sliding becomes too large, resulting in high contact resistance and instability. If it exceeds 5% by weight, when it becomes oxidized Cd, the contact resistance increases and wear resistance deteriorates. Therefore,
The content of Cu is 3 to 12% by weight, and the content of Cd is not more than 5% by weight. 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 mm made of alloy materials of the example and conventional example shown in the left column of Table 1 below were each cut into lengths of 8 mm, and two wire rods were placed in parallel with one end having a width of 10 mm and a length of 8 mm. A brush was made by welding it to a base material with a length of 13 mm and a thickness of 0.2 mm, and a 2R arc-shaped contact part was curved at the other end. On the other hand, slip rings with a diameter of 50 mm were made by punching out 0.5 mm thick plates made of alloy materials having the compositions shown in the right column of Table 1 below. Therefore, a sliding contact device was made by combining these brushes and slip rings, respectively.
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 of the brush and slip ring were measured, and the results are shown in Table 2 below. We obtained the results shown below. Test conditions Current: 0.6A Voltage: 12V Load: Resistance load Rotation speed: 1000 rotations/Divide speed: 120-130m/min Contact force: 100g Sliding time: 7 hours

【table】

[Table] As is clear from Table 2 above, the brushes and slip rings of the sliding contact devices of Examples 1 to 12 have a greater amount of wear than the brushes and slip rings of the sliding contacts of Conventional Examples 1 and 2, respectively. It can be seen that the contact resistance is low and stable. This is because the softening temperature of the alloy material constituting the brushes of the sliding contact devices of Examples 1 to 12 is increased by at least one of W, V, and Ta, and adhesion during sliding is suppressed. This is because the wear resistance is improved, and the amount of oxides generated during sliding is balanced with the amount of wear. In addition, the Cu alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 12 suppresses the increase in stickiness during sliding and improves wear resistance. None other than that. 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. Since there is almost no contact resistance and the contact resistance is low and stable, it can be said to be an epoch-making device that can replace conventional sliding contact devices.

Claims (1)

[Claims] 1 Au-Ag-Cu with a composition ratio of 60.5 to 64.5% by weight, 27 to 31% by weight of Ag, and 6.5 to 10.5% by weight of Cu is 95 to 95% by weight.
A brush made of an alloy material consisting of 99.5% by weight and the balance of at least one of W, V and Ta in total of 0.5 to 5% by weight, and Ag-Cu3 to 12% by weight or Ag-Cu3 to 12% by weight. A sliding contact device consisting of a commutator or slip ring made of an alloy material containing 5% by weight of Cd or less.