JPH0332864B2 - - 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 is made of Au68~72wt%, Pt3
~7% by weight, Ag8~12% by weight, Cu12~16% by weight,
It is a combination of a brush made of an alloy material containing 0.1 to 2% by weight of Ni and a commutator or brush made of an alloy material containing 0.5 to 15% by weight of Ag-Cd. By the way, since the brush of this sliding contact device is made of the aforementioned alloy material, it softens and tends to stick when sliding with the commutator or slip ring, resulting in poor wear resistance and a tendency to generate wear particles. This caused contact resistance to become unstable. 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 Au68 to 72.
Weight%, Pt3~7wt%, Ag8~12wt%, Cu12
~16 wt% Au-Pt-Ag- with 0.1-2 wt% Ni
Cu-Ni: 95-99.5% by weight, balance: Cr, Mg, Zr
and at least one of P in total of 0.5 to 5% by weight
A brush made of an alloy material consisting of Ag-
It is combined with a commutator or a 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. In the sliding contact device of the present invention, the composition ratio of the brush is 68 to 72% by weight of Au, 3 to 7% by weight of Pt, and 8 to 12% of Ag.
wt%, Cu12~16wt%, Ni0.1~2wt%
The reason why the alloy material is composed of 95 to 99.5% by weight of Au-Pt-Ag-Cu-Ni and the balance consisting of 0.5 to 5% by weight of at least one of Cr, Mg, Zr and P in total is because the above-mentioned Au - This is to increase the softening temperature and suppress adhesion during sliding in order to improve the contact resistance characteristics and wear resistance of the Pt-Ag-Cu-Ni alloy material, and if it is less than 0.5% by weight, this effect cannot be achieved. 5.0% by weight
If it exceeds this, the amount of oxides generated will increase, the contact resistance will increase, and furthermore, it will become unstable. Furthermore, by setting the content of Au, Pt, Ag, Cu, and Ni 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. It is what it is. 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. The results shown are obtained. 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 softening temperature of the alloy material constituting the brushes of the sliding contact devices of Examples 1 to 15 increases due to the addition of Cr, Mg, Zr, and P, which suppresses adhesion during sliding. ,
This is because the wear resistance is improved and the contact resistance is lower and more stable. 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 Composition ratio: Au68-72% by weight, Pt3-7% by weight,
95-99.5 wt% Au-Pt-Ag-Cu-Ni with 8-12 wt% Ag, 12-16 wt% Cu, 0.1-2 wt% Ni
and the balance is composed of an alloy material consisting of a total of 0.5 to 5% by weight of at least one of Cr, Mg, Zr and P, and 3 to 12% by weight of Ag-Cu or Ag-
A sliding contact device consisting of a commutator or slip ring made of an alloy material containing 3 to 12% by weight of Cu and 5% by weight of Cd or less.