JPH056769B2 - - 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.
It is composed 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 in order to eliminate such drawbacks, and aims to provide a sliding contact device in which the wear resistance and contact resistance of the brush are improved, and the wear resistance of the commutator or spring is improved. It is something to do. 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 W, V and Ta in a total amount of 0.5 to 5.0% by weight, and Ag-Cu3 to 12% by weight or Ag-Cu3 to 12
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 is Au8
~12wt%, Pt8~12wt%, Pd33~37wt%,
Ag28~32wt%, Cu12~16wt%, Zn0.1~2
Weight% Au-Pt-Pd-Ag-Cu-Zn is 95~99.5
The reason why the alloy material is composed of an alloy material in which the weight percent and the balance is at least one of W, V, and Ta in a total of 0.5 to 5.0 weight percent is because of the contact resistance characteristics of the Au-Pt-Pd-Ag-Cu-Zn alloy material. This is to improve adhesion resistance in order to improve abrasion resistance. If the total amount of at least one of W, V and Ta is less than 0.5% by weight, the effect cannot be achieved, and if it exceeds 5% by weight, oxides will be generated. The amount of contact increases, the contact resistance increases, and furthermore, it becomes unstable. Ag-
The reason why it is made of an alloy material of 3 to 12% by weight of Cu or 3 to 12% of Ag-Cu to 5% by weight of Cd is to suppress the stickiness when sliding with the brush and improve wear resistance. If the Cd content 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 will be too large, resulting in high contact resistance and instability. If it exceeds % 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 to a length of 8 mm, and two wires 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 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: 130-120m/min Contact pressure: 100g Contact 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 10 have a higher amount of wear compared to 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 because the alloy material constituting the brush of the sliding contact devices of Examples 1 to 10 is prevented from softening during sliding by W, V, Ta, etc., and its adhesion resistance is improved. This is because the wear resistance is improved as a result. In addition, the Cu alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 10 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%
-Zn is 95-99.5% by weight and the balance is W, V and Ta
A brush made of an alloy material containing at least one of the following in a total amount of 0.5 to 5.0% by weight, and a commutator made of an alloy material of 3 to 12% by weight of Ag-Cu or 3 to 12% by weight of Ag-Cu - 5% by weight of Cd or less. A sliding contact device consisting of a slip ring.