CARBON BRUSH FOR TRANSFERRING HIGH CURRENTS

Abstract

A carbon brush for transferring high currents having a connective piece for connecting an electric conductor and a consumable contact piece having a contact surface formed for abutting against a commutator element. The connective piece has a silver content of approximately 5% by weight to approximately 39% by weight and the contact piece has a silver content of approximately 40% by weight to 100% by weight.

Claims

1. A carbon brush for transferring high currents having a connective piece for connecting an electric conductor and a consumable contact piece having a contact surface configured for abutting against a commutator element, wherein the connective piece has a silver content of approximately 5% by weight to approximately 39% by weight and the contact piece has a silver content of approximately 40% by weight to 100% by weight.

2. The carbon brush according to claim 1, wherein the connective piece has a silver content of approximately 10% by weight to approximately 39% by weight.

3. The carbon brush according to claim 1, wherein the contact piece has a silver content of approximately 80% by weight to approximately 98% by weight.

4. The carbon brush according to claim 1, wherein the carbon brush is free of copper.

5. The carbon brush according to claim 1, wherein a pigtail which is connected to the brush body via a plug connection is provided in the connective piece, the pigtail being connected to the brush body preferably by means of crimping or the pigtail being pressed together with the brush body.

6. The carbon brush according to claim 1, wherein the connective piece and the contact piece are formed in a layer merging zone directed transversally to the abrasion direction of the carbon brush so as to merge with one another, and form a one-piece mold.

7. The carbon brush according to claim 1, wherein the connective piece and the contact piece are essentially of the same length (L) in an initial state.

8. The carbon brush according to claim 2, wherein the connective piece has a silver content of approximately 15% by weight.

9. The carbon brush according the pigtail is connected to the brush body by crimping or the pigtail being pressed together with the brush body.

10. The carbon brush according to claim 5, wherein the pigtail is connected to the brush body by being pressed together with the brush body.

Description

[0017] According to the disclosure, a method for transmitting high currents using a carbon brush according to the disclosure is further realizable.

[0018] Further features of the disclosure can be derived from the following description of a preferred exemplary embodiment of the disclosure in conjunction with the drawing and the dependent claims. In this context, the individual features can stand alone or be realized in combination with one another.

[0019] The FIGURE shows a schematic view of a carbon brush 10 according to the disclosure having a contact piece 11 and a connective piece 12. Both the contact piece and the connective piece are made of individual mold particles. In the initial state, pieces 11 and 12 are of the same length L.

[0020] Contact piece 11 abuts against a contact surface 14 of a commutator element 15 with a contact surface 13. The commutator element is a slip ring 15 in the exemplary embodiment at hand. Contact surface 13 of contact piece 11 is adapted to the shape of the outer circumference of slip ring 15, meaning contact surface 13 of contact piece 11 can snuggly abut against contact surface 14 of slip ring 15. On the free end of connective piece 12, a pigtail 16 is stamped into connective piece 12.

[0021] In carbon brush 10, contact piece 11 consists of a mixture of 90% by weight silver and 10% by weight carbon and is consumed in the direction of the pressing force which is indicated in the FIGURE by the arrow.

[0022] Connective piece 12 of brush 10 consists of a mixture of 20% by weight silver and 80% by weight carbon. The carbon of the connective piece and of the contact piece is available in the form of graphite.

[0023] Brush 10 is produced by means of a molding method during which carbon brush 10 is formed as a mold via suitable compression.

[0024] Carbon brush 10 is free of copper in the exemplary embodiment at hand. This prevents a patina from forming on slip ring 15.