JPS618888A - Slide contact unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sliding contact device, and particularly to materials for a brush, a commutator, or a slip ring constituting the sliding contact device.

(Prior art and problems) Conventional sliding contact devices have P d of 20 to 70% by weight, A
A brush made of an alloy material of 30 to 80% by weight;
It is combined with a commutator or slip ring made of an alloy material containing 0.5 to 15% by weight of Ag-Cd.

However, in this sliding contact device, the brushes tend to wear out when sliding with the commutator or slip ring, causing noise generation.

On the other hand, commutators or slip rings have high stickiness and poor wear resistance when sliding with brushes.

(Object of the Invention) The present invention has been made to eliminate such drawbacks, and aims to provide a sliding contact device that suppresses brush wear and improves the wear resistance of a commutator or slip ring. It is.

(Structure of the invention) The sliding contact device of the present invention contains 20 to 70% by weight of Pd.

A brush composed of an alloy material containing 30 to 80% by weight of Ag, 0.5 to 15% by weight of CD in Ag, and St and Z.
It is combined with a commutator or slip ring made of an alloy material containing 0.5 to 10% by weight of r in total.

In addition, some of the elements added to the alloy material constituting the commutator or slip ring are 0.01 to 0.5% by weight.
It is also possible to substitute Fe group elements (Fe, Co, Ni) within the following range.

In the sliding contact device of the present invention, the reason why the brush is made of the same alloy material as the conventional brush, which has P d of 20 to 70% by weight and Ag of 30 to 80% by weight, is to take advantage of its excellent corrosion resistance.

Commutator or slip ring in Ag from 0.5 to
The reason why it is made of an alloy material with a total of 0.5 to 10% by weight of Si and Zr added in addition to 15% by weight of Cd is that it increases the softening temperature during sliding with the brush and improves wear resistance. If it is less than 0.5% by weight, it will not be able to exhibit its effect, and if it exceeds 10% by weight, the amount of oxides will increase, the contact resistance will be high, and it may become unstable. It is.

Therefore, some of the elements added to the alloy material constituting the commutator or slip ring include Fe group elements (Fe, Co, etc.) in a range of 0.01 to 0.5% by weight.

When substituted with Ni), the crystal grains can be made finer and wear resistance can be further improved. If it is less than 0.01% by weight, the effect of grain refinement will not appear, and if it is more than 0.5% by weight, the effect of grain refinement will not appear. However, no further effect can be obtained.

(Example and Conventional Example) Brush wires with a wire diameter of 0.7 mm made of an alloy material containing 60% by weight of P'd and 40% by weight of A g were cut into 8 lengths, and two wires were placed in parallel, with one end having a width of 10+i. A brush was made by welding a composite material with a length of 13 cranes and a thickness of O and hi, and a 2R arc-shaped contact part was curved at the other end. On the other hand, a slip ring having a diameter of 50 mm was made by punching out a plate material having a thickness of 0.51111+ made of alloy materials of the examples and conventional examples having the compositions shown in the left column of the table below. 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 we measured the wear amount and contact resistance of the slip ring, we obtained the results shown in the right column of the table below. Test condition type Current: 0.6A Voltage: 12■ Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 220-130m/rn]n Contact crab 1
00g Sliding time Near time (blank below) As is clear from the table above, the brushes and slip rings of the sliding contact devices of Examples 1 to 3 are different from the brushes and slip rings of the sliding contact devices of Conventional Examples 1 and 2, respectively. It can be seen that the amount of wear is less than that of a spring, and the contact resistance is low and stable. This is simply because the alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 3 has a softening temperature during sliding that is increased by the addition of at least one of Si and Zr, and adhesion during sliding. This is because the wear resistance is improved, and the amount of oxide generated during sliding is balanced with the amount of wear. In particular, the slip ring of the sliding contact device of Example 3 has less wear compared to the slip rings of other sliding contact devices because of the F
This is due to the addition of Group E elements, whose crystal grains are finely dispersed, and the wear resistance is improved.

(Effects of the Invention) As detailed above, the sliding contact device of the present invention has less wear on the brush, commutator, or swamp ring compared to conventional sliding contact devices, and generates almost no noise. Furthermore, since the contact resistance is low and stable, it can be said to be an epoch-making device that can replace conventional sliding contact devices.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. to V

Claims (1)

[Claims] 1) A brush made of an alloy material containing 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, and 0.5 to 0.5 to 100% of Cd in Ag.
15% by weight, and a total of 0.5 to 10% by weight of Si and Zr.
A sliding contact device that is combined with a commutator or slip ring made of an alloy material. 2) A part of the elements added to the alloy material constituting the commutator or slip ring is replaced with Fe group elements in a range of 0.01 to 0.5% by weight. The sliding contact device according to item 1.