SU721017A3 - Material for electric machine contact rings - Google Patents

Abstract

1518341 Carbon bodies ROBERT BOSCH GmbH 23 May 1975 [13 Sept 1974] 22443/75 Heading C1A [Also in Divisions H2 and C3] A slip ring for electrical machines is manufactured from a mixture containing carbon, a binder, and optionally metal powder, the binder being an aromatic polymer free from cross-linking in which the aromatic nuclei are unsubstituted and linked by a C-C bond, or by a hetero atom, or by a hetero atom grouping. A preferred binder is a polyarylsulphide of the formula: e.g. polyphenylsulphide.

Description

one

This invention relates to a carbonaceous material for slip rings of electric machines,

Contact rings are known, the material of which contains carbon and binder 1.

However, the known contact rings have a low mechanical strength, and the contact leads in these rings are difficult to perform.

Such slip rings are made as follows. The components are graphite, coke, in some cases the metal powder and the binder are mixed in the required ratio, powder or granules. pressing in dies to obtain the desired shape, then through TBOiit appropriate heat treatment is achieved connection between the components, in particular by hardening or coking the binder. Pressing and stamping is expediently carried out at room temperature and, at the same time, simultaneously pressing in the electrical leads.

In this case, the following requirements are imposed on the binder:

1. At room temperature it should be in a powdery state and have good flowability,

2. At temperatures above a certain and sufficiently high melting point, it should melt quickly and have as low viscosity as possible.

3. In the molten state, it should wet the carbon well, and

in certain cases, and metal powder, which leads to an increase in mechanical strength with low pbreb content of the binder.

4.It must be able to form a grid by heat treatment in air,

5.It should contribute to the improvement of the wear resistance of the slip rings when the latter interact.

with carbon brushes.

All of the above requirements should be fulfilled as completely as possible.

Claims (2)

Pitch, phenolic resin and lead, previously used as a binder, do not meet all of the above requirements at the same time. Therefore, to achieve sufficient mechanical strength, a relatively large proportion of binder is required, which adversely affects SftSS, - 3-iJ &; "U Co" 5S S. "U-i. . ,, -,.-is ™. jr. , „Sy5,5Ky: A.- and lvktro- and thermal conductivity. HOSTOM can hardly be done with this method, and JiSWfb has sufficient mechanical components for NS5CTY. The purpose of the invention is to increase the strength and increase the duration of the invention of the invention with the fact that, as a binder, aromatic polymers, in the case of aromatic cores, are directly connected by means of a C-C bond of a needle by a heteroatom or hetero-atom Grouping of flavors. W ratio of components, parts by weight: Carbon42-99.5 Binder 0.5-50 Binder is made in the form of polyarylsulfide of the general formula Ar-S Ar-ST - s - Ar; ..., Ar 3iTo aryl or aryl, containing ash killers. As a binder, it uses polyphenylene sulfide, and in the material of the contact rings, powdered copper is additionally introduced in a volume of 1-57.5 parts by weight. Experiments have shown that the above group of substances largely meets the listed requirements of the room temperature; they have good flowability; due to their aromatic character, they choir SHOW moisten carbon and easily flow. ,, Preference is given to polyarylsulfide of the general formula Ar -; s - Ar - S - Ar.,, L and A (is a Se & ikyio cycle system, atsmema In which it can and ; SCHOOL (YonO1, AlCYL; residues. Among the substances belonging to the group of compounds, the most preference should be given to polyphenylene sulfide of the following formula:,:; The preferred amount of the binder mixture should be 3-10 weights per hour 100 parts by weight of carbon. EXAMPLE: - 100 parts by weight of natural gryphite and 10 parts by weight of polyphenylene sulfide in milled About: Ё | Й® | |; 1О Й ШШШ | 18бт1й и и stampё, internal f (the erma that forms the shape created from de.di) is pressed under a pressure of 4 t / cm. After removing the pressurized wastewater 1Ш 113 13 М№ Ина п After 1 hour, it is sintered at about 10 in an atmosphere of protective gas, for example, Gas or urban gas 7 of a mixture consisting of hydrogen, methane and carbon monoxide. After Cooling, the contact surface is ready. Thanks to relatively low sintering temperatures, contact points can be pressed in the same working operations. Instead of 100 weight.h. natural gas can be used, for example, 42 parts by weight. natural graphite and. 55 wt. including powdered copper, as a result, instead of a non-metallic slip ring, a ring with a corresponding content is obtained. myy Manufacturing conditions are similar. In this case, the contact terminals are also pressed in the same operation. The service life of slip rings made of the proposed material is bj 10 times longer than that of slip rings made of copper. A further increase in service life can be expected if the optimum blends for brushes and slip rings are selected. From the proposed material, coal-based contact rings can be used, which, despite low sintering temperatures, have high mechanical strength, due to efo, the reinforcement by metal inserts, which is common for such rings, becomes unnecessary. The manufacturing process is simple, and the contact leads can be directly pressed into the rings during the manufacturing process. Due to the minimal abrasion in electrically driven machines, smaller carbon brushes can be used, as well as simpler and cheaper brush holders and slip rings. - /; :: ...-: A: l-; .:. -; -: g. m. . . Claim 1. The material for the contact rings of electropH4 nee machines., Containing carbon and a binder., Which is necessary to increase the mechanical strength and increase the service life, the aromatic binder is used as the binder. polymers whose aromatic cores are directly connected by C – C bonds or by a heteroatom or heteroatomic grouping at. the following ratio of components, parts:. .. Carbon 42-99,5 Binder 0.5-50 2. The material according to claim 1, about tl and h ayusch and with the fact that the binder is made in the form of polyarylsulfide of the general formula Ag-5-Ar-S-Ar ... Ar is aryl or aryl. moreover, it contains alkyl substituents, 3, PPP and 2 Mörtersh, o tl ich icy with the fact that full phenylene sulfide is used as a binder. . . 4.Naterigish on PP .. 1-3, about tl and h. hell and with the fact that honey powder in the amount of 1-57.5 parts by weight was additionally introduced. Sources of information taken into account in the examination 1, USSR Copyright Certificate 444291, cl. H 01 R 39/20, 1965.