JPH056774B2 - - 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 that constitute the sliding contact device. Conventional sliding contact device is made of Au8~12wt%, Pt8
A brush composed of an alloy material of ~12% by weight, Pd33-37% by weight, Ag28-32% by weight, Cu12-16% by weight, Zn0.1-2% by weight, and Ag-Cd0.5-15% by weight.
This is a combination of a commutator or a slip ring made of an alloy material. By the way, since the brush of this sliding contact device is made of the above-mentioned alloy material, when it slides with the commutator or the slip ring, abrasion powder is likely to be generated, resulting in unstable contact resistance. On the other hand, the commutator or slip spring 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 and contact resistance characteristics of the brush are improved, and the wear resistance of the commutator or slip ring is improved. It is something. The sliding contact device of the present invention has a composition ratio of Au8 to 12% by weight, Pt8 to 12% by weight, Pd33 to 37% by weight, Ag28
~32wt%, Cu12~16wt%, Zn0.1~2wt%
Au-Pt-Pd-Ag-Cu-Zn is 95-99.5% by weight
and the balance is composed of an alloy material containing at least one of B, Si, Ge, and Tl in a total of 0.5 to 5.0% by weight, and Ag-Cu3 to 12% by weight or Ag-Cu3 to
It is combined with a commutator or slip ring made of an alloy material containing 12% by weight - 5% by weight of Cd or less. In the sliding contact device of the present invention, the composition ratio of the brush is 8 to 12% by weight of Au, 8 to 12% by weight of Pt, and 33 to 37% by weight of Pd.
Weight%, Ag28~32wt%, Cu12~16wt%,
Au-Pt-Pd-Ag-Cu-Zn with Zn0.1~2wt%
The reason why the alloy material is composed of 95 to 99.5% by weight and the balance of at least one of B, Si, Ge, and Tl in a total of 0.5 to 5.0% by weight is that the Au-Pt-Pd-Ag
- To improve adhesion resistance in order to improve contact resistance characteristics and wear resistance of Cu-Zn alloy material, B,
If the total amount of at least one of Si, Ge, and Tl is less than 0.5% by weight, the effect cannot be exhibited, and if it exceeds 5% by weight, the amount of oxides generated increases, contact resistance becomes high, and it becomes unstable. It is something. 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, 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 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 significantly lower and the contact resistance is even lower and more stable. This is simply because the alloy material constituting the brushes of the sliding contact devices of Examples 1 to 13 generates oxides such as B, Si, Ge, Tl, etc. when sliding, and these oxides act as lubricants. Improved adhesion resistance, resulting in improved wear resistance,
Moreover, since the oxide is soft and easily removed by the sliding action, the contact surface of the brush is always clean and the contact resistance is further reduced. 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. 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: Au8-12% by weight, Pt8-12% by weight,
Au-Pt-Pd-Ag-Cu with Pd33~37wt%, Ag28~32wt%, Cu12~16wt%, Zn0.1~2wt%
- A brush made of an alloy material containing 95 to 99.5% by weight of Zn and the balance of a total of 0.5 to 5.0% by weight of at least one of B, Si, Ge, and Tl, and Ag-Cu3 to 12
A sliding contact device that is combined 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.