DE6600333U - METHOD OF MANUFACTURING CARBON BRUSH - Google Patents

Description

SCHlTNK & EBF GMBK
H ^ TTCHELHETM

U. 450 574-1. B. 68

Carbon brushes for electrical machines

In the case of carbon brushes, which are used to supply power to the collectors are used for electrical machines, there are two fundamentally different ones Requirements. The part of the carbon brush that rubs on the collector and is therefore subject to wear, should consist of a material that is as small as possible Creates friction. Furthermore, the wear should be low and it is also required that the colleague is spared.

The top, i.e. the part of the carbon brush facing away from the collector, which is also referred to as the head, serves to accommodate the power supply cable and, in addition, the pressure with which the carbon brush against the is exceeded here via a spring or directly by means of a spring Collector must be pressed. This part is not subject to wear. In addition, it has no influence on the protection of the collector, so the requirements here are fundamentally different from those of the wearing part of the carbon brush. Good conductivity is required of the head of the carbon brush, so that the lowest possible losses arise from Ptromwärrne, which is generated by the contact resistance between the actual material of the carbon brush and the cables. In addition, the material should be as tightly as possible to the head of the carbon brush, so that by the pressure finger is excited at vibrations of the machine or the collector to oscillate, ks! "Ä damage sn brush ERfl

It is well known that they are often used to fasten the cable a solder contact, in which first corresponding holes be attached in the carbon brush. Then the surface of the carbon brush is scalloped so that the cable is inserted can be. In other versions, the cable is riveted or tamped with copper powder attached.

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SCHUNK & EBE GMBH
HEUCHELHEIM

Far from it, it is possible to combine certain materials " Settling of the cables when the powder is pressed »from which the carbon brush is to be made and then the pressed part together with the pressed one To sinter cables.

In this case, the material of the carbon brush generally consists of a mixture of graphite powder and metal powder. But it is also possible to use only graphite powder or other carbon powder, with a binder if necessary must be added to bein? Sintering to obtain a sufficiently strong bond between the carbon particles «

The innovation is based on the task of creating a carbon brush SU create that have both good sliding properties and low wear and tear as well as sufficient strength and low " Has contact resistance at its head end or on the cables »

This problem is solved according to the invention by a carbon brush, which is characterized in that on the head The carbon brush material is used with a low specific electrical resistance and higher strength than that Material on the opposite part of the carbon brush.

When testing the efficient manufacture of carbon brushes, it was possible to manufacture the brush from two materials, whereby for the part of the brush that is subject to wear, which is located on the collector, a material is used that complies with the above-mentioned claims is sufficient, while a material was used for the head of the sole that corresponds to the conditions required for the Current transfer to the cable and with regard to the strength of the Rest of the pressure finger are made. Such carbon brushes are manufactured in such a way that the preferred show automatic production, hydraulic or automatic Pressing a filling shoe is used, which is divided into two KaEunern. The arrangement of this filling device

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SCKUNK A EBE GMBK

HEUCHELHEIM - Sheet 3 -

and the press die that is used to manufacture these carbon brushes is used · is shown in the drawing, for example.

Fig. 1 shows a section through the Praßganomk with · filling shoe. Fig. 2 shows Sohnltt hurrying through the filled die and the upper punch with the cable inserted.

The horizontally movable filling shoe 1 is divided by a wall 2. To fill the press die, it is pushed over the die in the horizontal direction, with the material from chamber k filling part 5 of the die while the material is discharged Füllechuhes chamber 6 of the chamber 7 of the mold fill · After filling of the die _f so the spaces 5 and 7 »dor filling shoe is withdrawn by a a.uto" atiuche device and the upper punch 8 gelvfc downward, moves to the die and presses the filled powders to the desired density,

In the event that the cables are also to be pressed in, a punch is used which, as shown in Fig. 2, has 2 holes through it which the cable 9 to be pressed in is guided · With * n going downwards of the punch, this cable is pressed into part 5 of the die «,

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Claims (1)

1 ι: 1 IS SCHUNK & EBE GKBH
HEUCHELHEIM Protection claims 1 »Carbon brush, the head of which is made of a different material insists = as that part of the basement of the Kellslstor, characterized in that at the head of the carbon brush material with a lower specific electrical resistance and raw strength than the material on the opposite part of the carbon brush. 2, carbon brush according to claim 1, characterized in that that on the head of the carbon brush a material with a higher metal content than on the opposite part the carbon brush is used » β carbon brush according to the. Claims 1 and 2, thereby characterized that during dos fressing at the head end of the carbon brush one or more cables with © ingepreß will" 4, carbon brush according to claims 1 to 3j thereby characterized in that they are pressed together the one brought in by a filling shoe with two chambers is the Matx'ise and therefore interlocks well different materials is preserved » nooollve / u den ü