Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-10-26
1992-05-12
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310328, 310 42, 310 45, 310 91, H02K 1300
Patent
active
051131064
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a brush holder for an electrical commutating machine, in particular for a d.c. machine for vehicles. More particularly the present invention relates to such a brush holder which has a brush plate supported in the frame of the commutating machine, and at least two brush mounts fastened in an insulating fashion on the brush plate and each accommodating a carbon brush and provided on their bearing side with a pull-through pin and a supporting web.
Apart from the insulating plate arranged between the brush mount with supporting web and brush plate, in a known brush holder of the above-mentioned type in order to ensure the insulated fastening of the brush mount on the brush plate, a first insulating disc is arranged between the brush plate and the rivet head overreaching the brush plate, and a second insulating plate is inserted between the rivet shaft and the bore, substantially larger in comparison thereto, in the brush plate. The entire brush mount is supported by the single rivet bolt.
In the case of extreme stresses on the commutating machine owing to impacts, shaking or severe temperature fluctuations, such as normally occur in vehicle operation, it has been found in connection with such brush holders that the brush mounts rotate on the brush plate and assume angular positions with respect to the commutator which are detrimental to proper commutating.
Consequently, in the case of a brush holder that is likewise known (U.S. Pat. No. 1,490,104) two supporting webs have been provided on the brush mount, and each supporting web has been riveted to the brush plate with the interposition of suitable insulating discs. Due to the double riveting, the assembly of such a brush holder is more intensive in terms of time. Again, the brush mount needs to be altered in design.
SUMMARY OF THE INVENTION
The brush holder according to the invention has the advantage that the insulating part necessary for the insulated fastening of the brush mount on the brush plate simultaneously provides for the brush mount a reliable guarantee against rotation. This guarantee against rotation is achieved due to the fact that through the annular web on the insulating part, on the one hand, the riveted insulating part itself is fixed in the brush plate and, on the other hand, the pull-through pin of the brush mount is fixed with the insulating plate on the insulating part in a form-fitting fashion. There is no change in the time-saving nature of the assembly, since only one rivet bolt must be riveted per brush mount. The insulating part according to the invention is a simple injection-moulded part or pressed part, which can be produced cost-effectively. Another insulating part is arranged on the brush plate at its side opposite to the brush mount and fixed by the same rivet bolt.
The second annular web is integrally formed in accordance with an advantageous embodiment of the invention on the insulating part around the first circular cutout produces an insulation between the rivet shaft and the edges of the bore in the brush plate. Therefore the special insertion into the bore of an insulating disc becomes superfluous, and a further assembly step is saved. In this process, the annular web can terminate either flush with the brush plate or, after further passing through the insulating plate, flush with the insulating plate.
An enhanced guarantee against axial lifting of the brush mount from the brush plate is achieved through additionally fastening the brush mount to the brush plate by means of a hollow rivet, which passes through the pull-through pin of the brush mount, the annular web and the second cutout of the insulating part. Such an additional guarantee is to be recommended above all in the case of installing the commutating machine in construction vehicles, where rugged operating conditions prevail. Brief description of the drawings
The invention is explained in more detail in the following description with reference to illustrative embodiments represented in the drawing.
BRIE
REFERENCES:
patent: 1490104 (1924-04-01), Gilchrist
patent: 1954910 (1934-04-01), Allen
patent: 2683826 (1954-07-01), Staak
patent: 3527971 (1970-09-01), Means
patent: 3654504 (1972-04-01), Susdorf
patent: 3731126 (1973-05-01), Hagenlocher
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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