JPH056776B2 - - 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 Pd30~50% by weight,
It is a combination of a brush made of an alloy material containing 20 to 40% Ag and 20 to 40% Cu by weight, and a commutator or slip ring made of an alloy material containing 0.5 to 15% Ag-Cd by weight. . By the way, the brush of this sliding contact device has poor abrasion resistance when sliding with a commutator or a slip ring, and easily generates abrasion powder, 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 against 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 Pd30 to 50.
wt%, Ag20~40wt%, Cu20~40wt%Pd
-Ag-Cu is 95 to 99.5% by weight and the balance is Sb, Mo,
A brush made of an alloy material containing a total of 0.5 to 5% by weight of at least one of Pb and Zn;
−Cu3~12wt% or Ag−Cu3~12wt%−Cd5
It is combined with a commutator or a slip ring made of an alloy material of less than % by weight. In the sliding contact device of the present invention, the composition ratio of the brush is 30 to 50% by weight of Pd, 20 to 40% by weight of Ag, and 20 to 20% by weight of Cu.
The reason why the alloy material is composed of 40% by weight of Pd-Ag-Cu, 95-99.5% by weight, and the balance consisting of 0.5-5% by weight of at least one of Sb, Mo, Pb, and Zn is that the Pd -This is to generate an appropriate amount of oxides that act as lubricants to improve the contact resistance characteristics and wear resistance of the Ag-Cu alloy material. If it is less than 0.5% by weight, the amount of oxides generated is small and it is not effective as a lubricant. If the amount exceeds 5% by weight, the amount of oxides generated increases, contact resistance becomes high, and furthermore, it becomes unstable. Furthermore, by setting the contents of Pd, 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 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 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,
Abrasion resistance deteriorates. Therefore, the Cu content is 3 to 12% by weight, and the Cd content is 5% by weight.
It was designed not to exceed. 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. It was welded to a base material with a length of 13 mm and a thickness of 0.2 mm, and a curved brush was made with a 2R arc-shaped contact part on the other end. On the other hand, the thickness of the alloy material of the example and conventional example of the composition shown in the right column of Table 1 below
A 50mm diameter slip ring was made by punching out a 0.5mm plate. Therefore, a sliding contact device was made by combining these brushes and slip rings, and 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. When the wear amount and contact resistance of the ring were measured, the results shown in Table 2 below were obtained. Test conditions Current: DC 0.6A Voltage: 12V Load: Resistance load Rotation speed: 1000 rotations/divided speed: 120-130m/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 16 have a greater 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 simply because the alloy material constituting the brush of the sliding contact devices of Examples 1 to 16 is Sb, Te, Mo, Pb, etc. during sliding.
Oxides such as Se, As, and Zn are generated, and these oxides act as lubricants, improving wear resistance, and because the oxides are soft, they are easily removed by sliding action.
This is because the contact surface of the brush is always clean and the contact resistance is further reduced. Also, Example 1~
This is because the Cu alloy material that makes up the slip ring of the sliding contact device in No. 16 suppresses the increase in stickiness during sliding and improves wear resistance. 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 Pd-Ag-Cu with a composition ratio of 30-50% by weight, 20-40% by weight, and 20-40% by weight of Pd-Ag-Cu, and the balance is a total of at least one of Sb, Mo, Pb, and Zn. Combining a brush made of an alloy material containing 0.5 to 5% by weight and 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. A sliding contact device consisting of the following.