JPH0351074B2 - - 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 device has Pd87~93% by weight,
It is a combination of a brush made of an alloy material containing 7 to 13% by weight of Ru and a commutator or slip ring made of an alloy material containing 0.5 to 15% by weight of Ag-Cd. By the way, the brush of this sliding contact device has poor wear resistance due to adhesion during sliding with the commutator or slip ring, and abrasion powder is likely to be generated, resulting in unstable contact resistance. 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 in order to eliminate such drawbacks, and it is an object of the present invention to provide a sliding contact device that improves the abrasion resistance and contact resistance characteristics of the brush and improves the abrasion resistance of the commutator or slip ring. It is something to do. The sliding contact device of the present invention has a composition ratio of 87 to 93% by weight of Pd, 7 to 13% by weight of Pd-Ru, 95 to 99.5% by weight, and the balance of at least one of Co, Sn, and Ti in total of 0.5 to 5% by weight. A brush composed of an alloy material consisting of 3% to 12% by weight of Ag-Cu or Ag-
It is combined with a commutator or slip ring made of an alloy material containing 3 to 12% by weight of Cu and 5% by weight of Cd. In the sliding contact device of the present invention, the brush has a Pd-Ru composition ratio of 87 to 93% by weight of Pd and 7 to 13% by weight of Ru.
The reason why it is made of an alloy material consisting of 95 to 99.5% by weight and the balance being 0.5 to 5% by weight of at least one of Co, Sn, and Ti in total is to improve the wear resistance of the Rd-Ru alloy material. This is to prevent adhesion by generating an appropriate amount of precipitates, and if it is less than 0.5% by weight, the amount of precipitates generated is small and 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. Furthermore, by setting the contents of Pd and Ru 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 the oxidized Cd wears off, 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/divided 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 13 have a higher amount of wear than the brushes and slip rings of the sliding contact devices of Conventional Examples 1 and 2, respectively. It can be seen that the contact resistance is low and stable. This is because the alloy material constituting the brush of the sliding contact device of Examples 1 to 13 is prevented from adhesion by the precipitate added with at least one of Co, Sn, and Ti, and the wear resistance is improved. However, this is because the amount of Cu, Sn, and Ti oxides generated during sliding is in balance with the amount of wear. In addition, the Cu alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 13 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 has contact resistance. Since it is also low and stable, it can be said to be an epoch-making device that can replace conventional sliding contact devices.

Claims (1)

[Claims] 1 Composition ratio: Pd 87-93% by weight, Ru 7-13% by weight
A brush made of an alloy material consisting of 95 to 99.5% by weight of Pd-Ru and the balance of a total of 0.5 to 5% by weight of at least one of Co, Sn, and Ti;
A sliding contact device that is combined with a commutator or slip ring made of an alloy material containing 3 to 12% by weight of Cu or 3 to 12% by weight of Ag-Cu and 5% by weight of Cd.