JP5399007B2 - Electrical sliding terminal and method for machining electrical sliding terminal - Google Patents

Description

  The present invention relates to an electric sliding terminal, for example a carbon brush, made of a carbon material, such as an electro-graphitic material, and having a body made, for example, by compression and thermal processing and possibly subsequent processing. The present invention relates to a method for processing an electric sliding terminal.

  An electric sliding terminal and a method for processing the sliding terminal are described in Patent Document 1. This publication relates to a wear-resistant electrical slider for potentiometers and a method of manufacturing the slider. It is proposed to manufacture the plate to manufacture the slider, and then to structure and individualize it. A laser processing method is disclosed for processing a front stage (Vorstufe) of an electric sliding terminal.

  In particular, the electric sliding terminals used in current collectors, such as in particular carbon brushes or sliding members, have the task of sending current from moving, eg rotating elements, to stationary elements. As the workpiece, an electric sliding terminal based on carbon and graphite is used.

  In order to produce such sliding terminals, starting materials including existing binders such as synthetic resins are first subjected to a molding process and then heat-treated, for example graphitized. Further, impregnation is performed in order to obtain desired characteristics depending on the field of use.

  Therefore, after processing the sliding terminal, it is necessary to form a structure, for example, a relief on the running surface or a holder accommodating portion on the side surface. Such a structure is basically produced by grinding, drilling or milling such a surface. Furthermore, such structures can be formed during molding, ie compression.

  In order to bond a carbon brush to a leaf spring, for example, it is known to metallize the back side opposite the running surface and then bond this back side to a part of the leaf spring with a bond of material. . For this purpose, according to Patent Document 2, it is proposed to form a bond by ultrasonic welding or laser welding.

  Patent Document 3 relates to a carbon brush that is structured without any mention that laser processing is provided.

  In Patent Document 4, a heat-treated surface induced by a laser is processed without being associated with a sliding terminal. Rather, the steel workpiece is alloyed with a laser.

  Patent Document 5 relates to a method for producing an excellent heat-resistant composite material. It can be read from this publication that an iron tube can be coupled to a Cu—C—Zr tube by electron beam welding. Furthermore, it can be roughened by a laser. From this publication, the relationship to the sliding terminal cannot be read.

  Patent Document 6 relates to a carbon brush having a sliding surface with a hole.

Finally, Patent Document 7 relates to a method for producing a plastic film. Here, there is a possibility of removing flash generated during compression.
DE-C-198 21 529 DE-A-103 59 896 GB-A-292 232 DE-C-697 20 531 EP-B-1 025 938 DE-A-10 2004 011 618 DE-A-42 36 558

  The problem of improving the electric sliding terminal and the method of manufacturing the electric sliding terminal so that high-precision processing can be performed by a simple treatment is the basis of the present invention.

  In order to solve this problem, the present invention substantially proposes that the body of the electric sliding terminal is processed, for example, structured by a laser.

  Laser machining shows the advantage that the shape can be appropriately changed in a desired region of the body without damaging adjacent regions. In particular, this can have a positive effect on the contact properties in the carbon brush.

  For example, at least one surface of the carbon body can be smoothed or roughened by laser processing. It is also possible to form indentations, for example pockets or receptacles, in particular on the sides. Accordingly, the following structure is appropriately formed in a desired region, that is, for example, a structure necessary for fixing a holder used for inserting a strand or fixing a sliding terminal. be able to.

  Due to the formation of the structure, suitable break-in properties can also be obtained, in particular with carbon brushes, without the need for costly mechanical processing.

  In order to obtain good electric compatibility (elektomotorische Vertraeglichkeit) and slight and even running-in characteristics and at the same time to obtain a high energy density, it is proposed that the running surface of the carbon brush has holes produced by laser machining ing. These holes provide the possibility to easily and evenly insert impregnating agents such as lubricants or abrasives. In this case, the holes can be formed evenly distributed on the running surface. Therefore, the impregnating agent is evenly distributed over the running surface without requiring costly treatment.

  Furthermore, according to the present invention, when the main body is formed as a carbon brush, the carbon brush has a groove extending in parallel with the stack and protruding from the sliding surface, and the carbon brush is supported on the sliding surface. Propose that. This improves rectification. This is because the leakage resistance is increased by the groove.

  Furthermore, the compressed skin formed by a particularly small carbon brush during production can be removed with high precision. Therefore, the usage length of the carbon brush is not noticeably affected compared to other mechanical processes.

  Preferred materials for sliding terminals structured by laser processing include carbon graphite and / or natural graphite containing a synthetic resin as a binder.

It is preferred to work with a gas laser such as a CO ₂ laser or with a solid state laser. In this case, a ruby laser or a YAG laser is particularly preferable. However, a semiconductor laser is also suitable for processing the body of the sliding terminal within a desired range.

  A method of the type described in the first part of the specification is characterized in that the body is machined with a laser. In this case, the body can be processed with a laser after pre-processing such as grinding or sawing.

  A method for processing a carbon brush having a sliding surface and capable of being supported on a stack of rectifiers is characterized in that the sliding surface is structured by a laser. In this case, the sliding surface can be formed with a plurality of evenly distributed holes into which an impregnant such as a lubricant and / or abrasive is placed.

  Furthermore, a groove extending parallel to the stack can be formed on the sliding surface by a laser. The purpose is to improve rectification.

  In particular, it has been proposed to form a recess, for example a pocket, on at least one side of the main body, in particular extending transversely to the compression direction. In the prior art, such depressions, such as pockets, can only be produced by costly procedures such as drilling and grinding and cannot be produced too precisely.

  Furthermore, it has been proposed that the compressed skin formed on the basis of the compression of the body can be at least partially removed by a laser.

  Other details, advantages and features of the invention are not only from the claims and from the single and / or combined features which can be read from these claims, but also from preferred embodiments as seen from the drawings. It is clear from the following description of the form.

  In the figure, a principle diagram of the carbon brush is shown. The carbon brush is made of a normal material, for example, carbon graphite and / or natural graphite having a plastic as a binder.

  Such carbon brushes are compressed and possibly pre-processed by grinding or sawing (Saegen). In order to obtain the desired properties of the carbon brush, particularly with regard to break-in, laser machining is performed. For example, referring to the carbon brush 10 seen in FIG. 1, it will be explained that the running surface 12 of the carbon brush has a plurality of holes 14 and 16 formed by laser processing. In this case, because of the holes 14 and 16, the running surface 12 wears faster than when there is no hole. This results in a slight break-in characteristic (Einlaufverhalten). This is because the running surface 12 is worn faster.

  However, these holes 14, 16 can be used to receive the impregnating agent. Thus, the impregnating agent can be evenly distributed over the running surface 12. As the impregnating agent, a lubricant and / or an abrasive is suitable.

  The carbon brush 18 that can be seen from FIG. 2 has a sliding surface 20. The sliding surface has a spherical shape that is similarly manufactured by laser processing.

  The carbon brush 18 is compressed in the longitudinal direction. Therefore, during compression, notches cannot be formed in a plurality of side surfaces, for example, the side surfaces 22 by normal treatment. The notch is later formed by grinding or drilling in the prior art. In the present invention, a recess 24 such as a pocket is formed on the side surface, that is, the surface 22 by laser processing, and a completely precise shape is obtained. Such depressions, i.e. pockets 24, are used, for example, to hold the carbon brush or as a sorting aid during installation. This can basically be seen from FIGS. 5 and 6. Thus, the carbon brush or body 38 has a groove-like recess 40 which preferably extends parallel to the running surface. The recess engages with means for locking the guide of the carbon brush during installation of the carbon brush. Furthermore, the recess 40 can be used as a holding device for the spring.

  Sorting aids can be made, for example, by carbon brush markings, which are formed by laser machining. Such a marking 42 is shown in principle in FIG.

  FIG. 3 shows a carbon brush 26 having longitudinal grooves 30, 32 starting from the sliding surface 28. These vertical grooves extend parallel to the commutator stack. A carbon brush 26 is supported on the commutator. This achieves an increase in leakage resistance (Querwiderstand) and thus improved rectification. The processing of the carbon brush 26, and hence the formation of the grooves 30, 32, is similarly done by a laser.

  Based on the teachings of the present invention, a carbon brush having the shape of a parallelepiped is constructed to obtain the desired shape of the end, which is otherwise costly sawing and There is a possibility that it can only be achieved by grinding. For example, the carbon brush 34 shown in FIG. 4 has a roof shape on the traveling surface side. The sliding surface 36 itself is curved. Such a carbon brush 34 can be used for a printer, for example.

The principle figure of 1st Embodiment of a carbon brush is shown. The principle figure of 2nd Embodiment of a carbon brush is shown. The principle figure of 3rd Embodiment of a carbon brush is shown. The principle figure of 4th Embodiment of a carbon brush is shown. 2 shows a carbon brush with a holding device. 1 shows a carbon brush with markings.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body, carbon brush 12 Running surface 14 Hole 16 Hole 18 Main body 20 Surface 22 Surface, Side surface 24 Indent 26 Main body 28 Sliding surface 30 Vertical groove 32 Vertical groove 34 Main body 36 Surface, Sliding surface 38 Main body 40 Indent 42 Marking

Claims (21)

In-carbon brushes that have a body (10,18,26,34,38) formed by a carbon material,
Sliding surface of said body (10,18,26,34,38), the carbon brushes, characterized in that it is structured by the laser. The carbon brush according to claim 1, wherein the main body (18, 34) is smoothed by laser processing on at least one surface (20, 36). The carbon brush according to claim 1 or 2 , wherein the main body (10) is roughened by laser processing on at least one surface (12). Wherein the body at least one surface of (18, 38) (22), a pocket or recess (24, 40) is, in any one of claims 1, characterized in that it is formed by laser processing 3 The carbon brush described. The carbon brush according to claim 4, wherein the recess (40) extends parallel to a running surface of the main body (38). The sliding surface of the present body is a carbon brush according to any one of claims 1 to 5, characterized in that it has a plurality of holes formed by laser processing (14, 16). The carbon brush according to claim 6, wherein an impregnating agent is placed in the plurality of holes (14, 16). The carbon brush according to claim 7, wherein the impregnating agent is at least one of a lubricant and an abrasive. In a carbon brush having a running surface,
A carbon brush characterized in that the running surface (12) is perforated by laser processing. In carbon brushes where compressed skin is generated,
The carbon brush , wherein the compressed skin is at least partially removed by laser processing. Is formed by a carbon material, a method for processing a carbon brush having a body with a sliding surface,
Structuring the sliding surface with a laser. The method according to claim 11 , wherein a plurality of holes are formed in the sliding surface by a laser. The method of claim 12, characterized in that said plurality of holes, add containing infusion. The method of claim 13, wherein the impregnating agent is at least one of a lubricant and an abrasive. 15. The method according to any one of claims 11 to 14 , wherein a pocket or a depression is formed on at least one side of the body. The method according to claim 15 , wherein the depression is formed in a state extending in a direction transverse to a compression direction of the main body. 17. A method according to any one of claims 11 to 16, characterized in that the running surface of the body is structured by a laser. The method according to claim 17 , wherein the running surface is drilled with a laser. The method according to claim 11 , wherein the compressed skin of the body is at least partially removed by a laser . 20. A method according to any one of claims 11 to 19, wherein the sliding surface is formed by a laser with a groove extending parallel to the stack of rectifiers on which carbon brushes are supported . In an electric sliding terminal having a body (10, 18, 26, 34, 38) formed of a carbon material,
  The electric sliding terminal characterized in that the main body (18, 34) is smoothed or roughened by laser processing on at least one surface (20, 36).

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