DE1088149B - The power supply to a multi-part collector brush arrangement - Google Patents

Description

GERMAN

It is known to divide the brushes for electrical machines, creating the so-called twin brushes or multiple brushes arise. Splitting a brush into several parts is used to reduce the size the current transfer between adjacent collector lamellas made possible by a wider brush.

In Figure 1, a contact piece 4 with a block coal 2 and a twin brush 3 is shown, which is used for supplying power. The block coal 2 slides in a holder box I _1, as does the twin brush 3. In this case, it is desired that the pressure finger always presses on both parts of the twin brush through the pressure piece, as shown in Figure 2.

Since the pressure finger tries to rotate around its pivot axis on an arc, the Wear of the two partial carbons very slightly unequal (see Fig. 3).

If z. B. the part brush 3 b accidentally wears only a little more than the part brush 3 a, the pressure shifts even more to the already further worn carbon 3 b. This promotes the unequal wear of both coals. The bevel of the coal heads shown in the picture cannot prevent this inequality of wear.

The even wear of the part brushes is of particular importance if the brushes need to be checked from time to time. It is then not certain that the brushes will be put back into the holder in exactly the same position. ' If, however, the brushes 3 a and Zb in Figure 3 are interchanged, it is easy to see that one of the brushes would initially receive no pressure at all.

A partial brush has already been provided with a sheet metal angle 5 (Fig. 4), which over the brush 3 α overlaps. Indeed, this angle ensures that both brushes wear evenly. However, he is not applicable in cases where the current through the pressure finger 4 comes directly from the brush should be removed, such. B. in rail operations. The inevitable due to the vibrations in the plant Experience shows that contact faults between pressure piece 4 and bracket 5 destroy the bracket in a short time Time during which the contact between the carbon brush and the pressure piece has proven to be good, especially if this is provided with a silver plating.

An arrangement consisting of a pressure finger and a collector brush serving to supply power to a collector brush attached to it roller-shaped pressure piece, which in a manner known per se in block coal in a Trough engages the head of the brush, according to the invention is that in a multi-part in one Holder box sliding collector brush that is attached to the power supply line

to a multi-part collector brush

serving arrangement

Applicant:

Ringsdorff-Werke G. mb H.,
Bad Godesberg-Mehlem

Erwin Köhler, Münclien,
has been named as the inventor

Tangential to the collector resilient pressure finger firmly attached and due to its shape in the approximately semi-cylindrical recess on the head of the brush Pressure piece is held by the trough walls in the central axis of the brush.

The invention is illustrated by Figures 5 and 6.

In the case of a non-armored twin brush, a recess 6 is worked into the brush as shown in Figure 5, and the pressure finger is designed in a manner known per se so flexible or elastic that the Pressure piece can move something tangential to the collector. The trough runs at the point of contact of the Partial brushes horizontal. This has the consequence that the faster wearing part brush automatically from Pressure is relieved. So your wear goes down, while that of the other part brush increases because it has to absorb most of the pressure. This ensures that both brushes wear evenly. The prerequisite for this is that the pressure piece 4 is no longer on an arc, but moved on the brush axis. This requirement is due to the elastic mentioned above Training of the pressure finger, the z. B. can be stored in rubber, fulfilled. The principle can also be used Use according to Fig. 6 for triple brushes.

A number of other constructions have become known before. But all have opposite serious disadvantages of the invention. So there are z. B. a construction in which the individual Brush parts are pressed together by a cap-like cover instead of holding them apart. Another known arrangement uses instead of one that is resilient at a tangential to the collector Finger attached pressure piece a tangential

:.: 009 589/197

tially non-resilient pressure finger, but gives the pressure piece the opportunity to run along the pressure finger to slide. However, this arrangement is not sufficient for the movement of the pressure piece along the brush axis to secure. In another construction with one placed over the head end of both part brushes elastic intermediate plate is a current connection of sufficient conductivity at most for small machines to achieve. So far an arrangement that comes close to the invention for a block coal is known, this does not make the task that is only present with multi-part brushes, a uniform one To secure wear of the part brushes solved.

Claims (1)

PATENT CLAIM: The power supply line to a collector brush serving arrangement of a pressure finger and a roller-shaped pressure piece attached to it, which is known per se in block coal Way engages in a trough on the head of the brush, characterized in that in a multi-part The collector brush that slides in a holder box and the one that is springy at the tangential to the collector Pressure finger firmly attached and due to its shape in an approximately semi-cylindrical recess on the head of the Brush fitting pressure piece held by the cavity walls in the central axis of the brush will. Considered publications:
German patents Fr. 620181, 660 972, 745, 898 469; British Patent No. 674,796;
U.S. Patent No. 2,477,766. 1 sheet of drawings © 009 589/197 8.60