JPH0332873B2 - - 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 brush made of an alloy material containing 5.5 to 9.5% by weight of Ag and 28 to 32% by weight of Cu, and a commutator or slip ring made of an alloy material containing 0.5 to 15% by weight of Ag-Cd. It is. By the way, since the brush of this sliding contact device is made of the above-mentioned alloy material, it has poor wear resistance when sliding with the commutator or slip ring, easily generates wear particles, and the contact resistance becomes unstable. I was getting used to it. 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 Au60.5~
64.5% by weight, Ag5.5~9.5% by weight, Cu28~32% by weight
95 to 99.5% by weight of Au-Ag-Cu and the balance is Sb,
At least one of Te, Me and Pb in total from 0.5 to
Combining a brush made of an alloy material containing 5% by weight with a commutator or slip ring made of an alloy material containing 3 to 12% by weight of Ag-Cu or 3 to 12% by weight of Ag-Cu-5% by weight of Cd. It is what it is. 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, 5.5 to 9.5% by weight of Ag,
Cu28-32wt% Au-Ag-Cu95-99.5wt%
and the balance is at least one of Sb, Te, Mo and Pb
The reason why the seeds are made of an alloy material consisting of a total of 0.5 to 5% by weight is that an appropriate amount of oxide is generated as a lubricant in order to improve the contact resistance characteristics and wear resistance of the Au-Ag-Cu alloy material. If it is less than 0.5% by weight, the amount of oxide generated is small and it cannot be effective as a lubricant, and if it exceeds 5.0% by weight, the amount of oxide generated is large, resulting in high contact resistance and This is unstable. Furthermore, by setting the content of Au, Ag, and Cu 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: DC 0.6A Voltage: 12V Load: Resistance load Rotation speed: 1000 rotations/divided speed: 130 to 120m/min Contact pressure: 100g Contact time: 7 hours

【table】

【table】

[Table] As is clear from Table 2 above, the brushes and slip rings of the sliding contact devices of Examples 1 to 15 have a higher 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 significantly lower and the contact resistance is even lower and more stable. This is because the alloy material that constitutes the brushes of the sliding contact devices of Examples 1 to 15 generates oxides such as Sb, Te, Mo, and Pb, and these oxides act as lubricants, resulting in poor wear resistance. This is because the contact surface of the brush is always clean and the contact resistance is lowered because the oxide is soft and easily removed by the sliding action. In addition, the Cu alloy material constituting the slip rings of the sliding contact devices of Examples 1 to 15 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. It is also much lower and more stable, so 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, 5.5 to 9.5% by weight of Ag, and 28 to 32% by weight of Cu is 95 to 99.5%.
A brush made of an alloy material with the balance being 0.5 to 5% by weight of at least one of Sb, Te, Mo, and Pb in total, and 3 to 12% by weight of Ag-Cu.
Or a sliding contact device made in combination with a commutator or slip ring made of an alloy material of 3 to 12% by weight of Ag-Cu and 5% by weight of Cd or less.