EP3117493A1

EP3117493A1 - Wiping contact element and method for the production thereof

Info

Publication number: EP3117493A1
Application number: EP15712822.4A
Authority: EP
Inventors: Gerhard Pielok; Olaf BÜLTER
Original assignee: Walter Kraus GmbH
Current assignee: Walter Kraus GmbH
Priority date: 2014-03-12
Filing date: 2015-03-12
Publication date: 2017-01-18
Also published as: WO2015136046A1; DE202014101130U1

Abstract

The invention relates to a wiping contact element for transferring electric currents to a mating contact (15). The wiping contact element (1) has a support (3) and a plurality of webs (2) that can be placed simultaneously in a springy manner on the mating contact, in particular micro-webs having a width of less than 0.25 mm which, at the dorsal end (9) thereof, are connected to the support (3). In the region of a contact zone (13) provided between the dorsal end (9) and the distal end (10), the webs (2) are spaced apart from one another and one or more webs (2) in the region of the contact zone (10) have a contact bead (20). The contact bead (20) is formed either by material removal from a web of rectangular cross section and has a coating (24) applied after the production of the contact bead (20), or the contact bead (20) is produced by applying a conductive contact material by micro-laser application welding. The invention further relates to a method for producing a wiping contact element.

Description

Sliding contact body and method for its production

DESCRIPTION

The invention relates to a sliding contact body for transmitting electrical currents to a mating contact, wherein the sliding contact body has a carrier and a plurality of simultaneously resiliently engageable with the mating contact webs. Such Schleifkontaktkorper are known in practice as contact springs.

Generic sliding contact bodies are used both for the transmission of power currents and for the transmission of signal currents. The previously known

Contact bodies have a limited life and show too high for some applications

Signal noise. From DE 10 2008 001 361 is a

Sliding contact arrangement with reduced signal noise is known, comprising a sliding contact body with two

Grinding wires with different diameters

having. These sliding wires cooperate with a V-groove-shaped sliding track on the mating contact in such a way that they move the sliding track at different positions

Touch angular positions. Such

Sliding contact arrangement requires a complex and expensive processing of the grinding path. It is also not suitable for the safe transmission of high power currents. It is an object of the present invention to provide a

Show sliding contact body having an improved signal noise behavior and / or increased life. The invention solves this problem by the features in the independent claims.

The sliding contact body according to the present

Revelation has a plurality of narrow webs, which can be applied simultaneously on a sliding track on the mating contact. The grinding path on the mating contact can be designed as desired. It is preferably transverse to the grinding direction and, for example, in the

Total extension of rotary sliding contacts circular or cylindrical wall or at

translational sliding contacts strip-shaped or band-shaped, so that a cost-effective production and easy installation are guaranteed.

The webs can cross several bridges

Forming contact zone with the mating contact, which extends substantially transverse to the grinding direction and having a plurality of individual contact points between a respective web and the mating contact. These

Single contact points are parallel to each other

switched so that a current at a momentary

Loss of contact at a first bridge over the

can flow more parallel contact points on the other webs. The sliding contact body may have a plurality of webs in a row arrangement, so that a corresponding number of parallel connected

Single contact points are generated. The webs have a longitudinally extending shape and a respective dorsal and a distal end. The dorsal end is that end which indicates attachment of the bridge to the wearer. The distal end is usually a free end, so that each bridge is elastically movable relative to the suspension.

Between the dorsal end and the distal end of the contact zone is provided at which one or each web to the mating contact comes to rest and a

Single contact point forms. The webs are preferably with a slight elastic bias to the

Set against contact, so that they remain in contact with shock or any unevenness in the grinding path in constant contact with the mating contact or in a possible lifting of the grinding path through the

Replace spring force immediately.

The webs are set at least in the region of the contact zone to each other at a distance. This ensures that a material portion of the web in the region of the individual contact point can move within certain limits independently of the adjacent webs. A part of

Contact pressure in the single contact point is for each bridge out of its own elasticity and its own bias. Incidentally, the pressing force from the elasticity and the bias of the wearer

emerge, to which the webs are attached.

According to a first independent aspect of the disclosure, at least two webs in the region between the dorsal end and the distal end to form a Bridge group to be interconnected. The connection is rigid and preferred by a common

Material formed, which is left in the production of the webs. There may be a single or multiple joints between the lands. One or more connection points can

in principle be arranged at any point between the dorsal and the distal end. At least one connection point at the distal end is preferred

intended. There are various arrangement profiles into consideration, which may include both single webs and web groups. Particularly advantageous are web groups at the outer edges of the

Sliding contact body proven. These have a higher lateral stability than single webs and less prone to lateral buckling. Furthermore, between web groups or within a web group lying individual webs are guided by the adjacent parts of a web group in the slip track or protected against lateral buckling.

Through the connection (s) or joints, the involved two or more webs are mechanically coupled within a land group, i. in the area of the junction, the bars become force-guiding

fixed to each other, while the web group in total compared to the other single webs or parallel

existing web groups is mechanically decoupled. The webs within a web group point through the

mechanical coupling another resonance behavior, in particular other natural frequencies, as the other webs of the sliding contact body. The resonance behavior has a significant impact on the dynamic

Investment behavior of a web on the mating contact. Even minimal bumps on the slideway,

Dirt, locally different wear points and / or changing relative velocities between the sliding contact body and the mating contact can cause vibrations in the contact area, in particular in the

Guide webs and the wearer of the sliding contact body. Such vibrations can interact with others

Excitation pulses, for example, from adjacent assemblies transmitted structure-borne sound, superimpose.

Since the Schleifkontaktkorper is elastic, it has a geometry-dependent resonance behavior, which can lead to an overshoot or overshoot. With such an overshoot or overshoot, it can become a

momentary and possibly local withdrawal of one or more webs come from the mating contact. Even if no

complete take off, the

Increase volume resistance in a single contact point when falling below a limit contact pressure.

The changes in the volume resistance and a possible lifting of one or more webs lead to a change in the total resistance in the

Slip contact, which can produce unwanted signal noise. By provided in accordance with the disclosure of connections between two or more webs web groups are formed, which each show a different resonance behavior. The natural frequencies between the webs and web groups can be distributed so that an up or down Overshoot occurs only locally with respect to one or a few lands, while for the remaining lands and

Steg groups an electrically conductive contact is guaranteed. Thus, a significant improved dynamic contacting can be achieved, wherein the electrical resistance of the sliding contact against external pulse, speed or

Vibration influences is stabilized.

According to another independent aspect of the

As can be used alone or with the aforementioned aspect, one or more webs in the region of the contact zone can have a contact bead whose width is smaller than the web width. The contact bead is arranged on the side of the web, which comes into contact with the mating contact and can

preferably have a transverse rounding. The reduced bead width and, if necessary, the transverse rounding on the

Contact bead cause the sliding contact body has the contacting behavior of a wire (so-called imperfect wire). In particular, the

Adhesive force between the sliding contact body and the mating contact considerably reduced. That is, the

Surface of the web absorbs itself by the smaller width and, if necessary, the transverse rounding not or less to the surface of the mating contact. As a result, the static friction and sliding friction in the grinding point are significantly reduced, which comes especially when starting from a standstill and at high grinding speeds wear.

Furthermore, the reduced bead width and / or the transverse rounding cause abrasion and dirt on the Sliding track are pushed away to the side. Of the

Contact bead thus causes a local cleaning effect on the grinding path. In continuous operation collect

Deposits only on the areas of the mating contacts, which are located between the contact beads, and in particular between the preferably spaced webs. As a result, a failure of individual contacts of the sliding contact body is counteracted in an unexpectedly efficient manner. Due to the cleaning effect in

Combined with the better abrasion resistance of the coated or described below

welded contact beads are service life of up to 20 million revolutions without cleaning the

Slip contact body or the mating contact reachable, i. an extension of the service life by a factor of 30 over previously known sliding contacts.

The web with the contact bead has compared to a wire, in particular compared to a round wire, a significantly better lateral stability, higher strength and a selectively influenced suspension behavior. The webs are less prone to kinking, but less abrasion (sanding dust) and have a clear

improved tracking stability in the grinding direction.

As a result of the reduction of the adhesion force, the relative movement between the two decreases

Contact partners resulting tensile forces in

Grinding direction, which is on the surface layer of the

Sliding contact body act, so that the wear is significantly reduced. An adhesion-related tearing of the uppermost material layer, for example. A nickel or Gold coating, the sliding contact body can

be avoided. As a result, the increased

Life of the sliding contact body considerably or the sliding contact body can be used for the same life under higher stress, i.

for example, at higher relative speeds between the contact partners or higher contact pressures.

A sliding contact body according to the present invention

Revelation preferably has microbridges. These are particularly narrow webs, in particular those with a width of less than 0.25 mm or less than 0.1 mm, and particularly preferably between 0.05 and 0.08 mm. The distance between two webs is preferably also smaller than 0.25 mm or 0.1 mm, in particular between 0.05 mm and 0.1 mm. The mean radius of curvature of a contact bead is preferably less than 0.1 mm,

especially smaller than 0.05mm.

Such small dimensions allow the arrangement of a variety of each separately movable webs and / or web groups in the smallest space. The sliding contact body can thus a similarly good electrical

Contacting behavior such as a micro-wire brush grinder, but at the same time has a much longer life, a lower stress on the grinding surface on the mating contact and no tendency to swell when moisture and / or for absorbing and storing liquids. Of the

Sliding contact body according to the present disclosure is therefore also suitable for use in difficult Ambient conditions usable, for example, for the transmission of power in wind turbines.

The narrower the web width is selected and the smaller the distance between two adjacent webs is selected, the more difficult or complicated the manufacturing process. Web widths of less than 0.25 mm width can currently be produced, for example, by micro embossing, etching or laser cutting. Web widths of about 0.1 mm or less can currently only be achieved by special etching or laser cutting

produce .

A particular preferred embodiment sees one

Sliding contact body with a plurality of micro-webs, wherein a web has a width of about 0.25 mm or less and carries at least one contact bead. On a web with a width of 0.25 mm, one, two or possibly three Kontaktwulste be applied. at

Bar widths of about 0.1 mm or less is the

Application of more than one or two webs possible only with great effort.

According to a first preferred embodiment variant, a contact bead can be formed by partially removing material, in particular by etching away the surrounding regions of a web with a rectangular cross section, and preferably subsequently applying a highly conductive layer

Contact layer be formed. That is to say that a contact bead consists of a residual material which remains on an outer side of a web (2) after corrosive removal of the web edges (22, 23) and optionally further material regions. According to an alternative preferred embodiment, a contact bead is by applying a highly conductive

Contact material produced by micro laser addition welding.

The material of the contact layer or the Kotaktstoffs is preferably gold or a noble metal such as silver or

Rhodium or an alloy whose main component is at least one of the aforementioned substances.

As such, micro-laser cladding is currently under development and has been successfully used to apply a conductive material to steel materials of significantly greater extent.

However, those for the production of

Sliding contact bodies used spring steel and

Coating materials often do not have good weldability. Materials with a high reflectivity require, for example, a high dosage of the radiation energy and thereby tend to too fast or too

large-scale heating, so that unwanted embrittlement or too large melting zones arise. Furthermore, toxic fumes can be produced in some material combinations. The mixing of the metals from the basic material of the

Sliding contact body (spring steel) and the

applied material may be the conductivity and / or the suspension properties and / or the edge hardness

significantly affect. Furthermore, it can easily due to the extremely thin web and bead widths

Material distortions come. It is therefore difficult to provide a highly electrically conductive contact bead

aufzuschweißen without causing too weak or too brittle welded joint, the resulting Forces from the abrasive contact not

can withstand.

According to the present disclosure, various geometric designs and materials are proposed which reduce or eliminate the above-mentioned disadvantages. These trainings and materials may each be alone or in any

Combination can be used.

The materials listed below show a suitability and processability favorable for the production of welded-on contact beads, in particular if the welding takes place on a previously produced web or micro bridge. In addition to the materials mentioned other cheap combinations of materials may exist.

Accordingly, the invention is not limited to the materials proposed herein.

As the base material for the sliding contact body, the following materials show positive properties: a cobalt-nickel-iron alloy containing about 17% by weight of cobalt and 28% by weight of nickel (balance predominantly or exclusively iron) or a CuBe2 beryllium copper alloy. The

The former alloy is also known under the trade name "DURACON" (registered trademark) and can be machined without generating toxic vapors by micro laser deposition welding

Properties with regard to the conservation of

Suspension characteristics and with a suitable choice of

Welding parameters have a low tendency to embrittlement. As material to be welded on, an AuCo Hard gold alloy good properties. It forms a narrow mixing zone with the base material of the

Sliding contact body without the

Suspension characteristics or conductivity in

unduly impaired. Further show gold-copper and gold-nickel alloys (copper or nickel ^¬ hard gold alloys) positive properties.

When welding the conductive material creates a mixing zone in which mix the base material of the sliding contact body (in particular spring steel) and the welded material and solidify as a mixed alloy with altered properties.

The abovementioned material combinations have a good stability of the mixing zone and promote the mechanical strength of the welded joint against tearing or shearing.

The height of the material being welded (as a strand or contact point) is preferably more than 0.03 mm and less than 0.15 mm above the surface of the

Sliding contact body (web surface or previously

formed contact bead). The height is particularly preferably between 0.05 mm and 0.12 mm in the case of the abovementioned microbridges. As a result, contact beads or contact points can be generated, on the one hand a high

have mechanical stability, so they the

resulting forces and moments (in particular

Shearing forces) from the abrasive contact

withstand. There is thus no sliding or shearing in the area of the pure material. On the other hand the thickness of the substantially pure material above the mixing zone, which determines the sliding properties required for the sliding contact and the

has required electrical conductivity, so high that particularly long service life can be achieved.

Compared to the usual flat coatings on flat webs, especially against nickel and gold layers applied by electroplating (thickness about 3-5 microns), a layer thickness increased by a factor of 10 to 100 is achieved, in particular a thickness of about 0.1 mm. The increased layer thickness alone or in combination with the bead formation also increases the service life of the sliding contact body. The contact bead preferably has one in the

Sanding direction elongated and in the transverse direction crowned shape. Alternatively, a contact bead a

Have lens or hemispherical shape and / or from a

Be formed plurality of in the grinding direction successive contact points (in particular with lens or hemisphere shape). The arrangement of

Contact points in a row offers the advantage that the above-mentioned cleaning effect also with a

Multiple contact points can be achieved.

Alternatively, a shingled or staggered arrangement of contact points is possible.

The welding of contact points is particularly advantageous on micro-webs of the above type, since possibly occurring changes in the suspension properties or the tensile strength of the base material or embrittlement of the sliding contact body occur only locally. Consequently, the web maintains a good elastic deformability in the region of the contact zone and has an increased

Breakage on. Also the creation of

Contact points for removal of material, in particular by partially etching away the web material in one

Rasterform, and the subsequent coating has

positive impact. A contact bead consisting of a plurality of contact points has a higher number of oblique flanks onto which a coating

can be applied. When removing the contact points, therefore, larger surface portions of the coating remain, the over a longer period of time

improve electrical contact when the

Contact point / contact bead is abraded over time.

In an elastic deflection of the webs, the welding zones of contact points and the welded material are exposed to lower voltages than is the case with a longer strand, so that the

Likelihood of material weakening due to breakage or cracking is reduced. Furthermore, a portion of a ridge with applied contact points is more easily deformed to form a longitudinal curvature than is the case with a longer length, without the highly conductive material

(Coating / welded contact point) too

to damage . One or more contact points can be welded onto a flat web or a contact bead previously formed by removing material from the web. Welding on a flat bar is easier to implement in terms of process engineering, since it places fewer demands on the exact positioning of the spot welds.

However, welding on one offers

Material removal formed Kontaktwulst additional benefits. When a contact point is applied to a contact bead formed by material removal (i.e., when two contact beads are formed on top of each other), the distance (the free height) between the side becomes

projecting areas of the web and the mating contact be further increased. Thus, more clearance for the attachment of dirt or debris is created, which in turn reduces the susceptibility to a pollution-induced failure.

Furthermore, it is achieved that in a complete

Tear off or sanding of the welded material is not the web with its entire web width with the mating contact comes to rest, but only the narrower formed by Materialwegnahme Kontaktwulst. Should a single welded-on material area, for example due to a faulty weld prematurely

be abraded or break away, in addition to the contact bead already formed accumulations of

Contamination or abrasion so not pushed away by the web in the direction of the adjacent webs and Kontaktwulste. Rather, the remaining contact bead provides for a further guidance of the web in the intended path, so that a parasitic chain of

Contact failures is counteracted.

In the subclaims, the accompanying drawings and the following description further advantageous embodiments of the invention are given.

The invention is illustrated by way of example and schematically in the drawings. Show it:

Figure 1: A sliding contact body according to a preferred embodiment with three web groups in contact with the grinding path of a mating contact;

Figure 2: a web with a longitudinal curvature in a separate representation;

Figure 3 is a plan view of a sheet in which a plurality of sliding contact bodies are cut out;

FIGS. 4 and 5 show two exemplary arrangement profiles for

Web groups and individual webs on a sliding contact body;

Figure 6: an enlarged view of a

Sliding contact bodies with contact beads on the webs and web groups;

Figure 7: an enlarged view of the detail

VII of Figure 6;

Figures 8 & 9 two exemplary arrangement profiles for a sliding contact body with

Single webs and web groups and with Kontaktwulsten arranged on the webs; Figures 10 - 12: sectional views of a web with a

Contact bead explaining the

Production, coating and the

Abrasions obtained; FIG. 13 shows a further arrangement profile for two edge-side web groups with individual webs lying therebetween and different embodiments for a welded-on contact bead; FIG. 14: a sectional view according to FIGS. 10 to

12 for a bridge with rectangular

Cross section and a welded contact bead;

Figure 15: A sliding contact body with several

Single bars and welded on

Contact points;

FIG. 16: a sectional view according to FIG. 14 for a web with a first through

Material removal formed contact bead and a second contact bead or contact point formed thereon by welding.

The invention relates to a sliding contact body (1) according to the preamble of the independent claims. A first preferred embodiment of

Sliding contact body (1) is shown in FIG. He is shown here in Appendix with a mating contact (15). The sliding contact body (1) has a support (3) on which a plurality of webs (2) which can be applied at the same time to the mating contact (15) are arranged. The carrier (3) may also have spring properties and comprise one or more flexible support portions (5). The carrier (3) may be formed in one or more parts and in particular be formed by a flat piece of sheet metal. At the end of the carrier (3) facing away from the webs (2), a fastening section (4) is preferably provided.

provided over which the sliding contact body (1) is electrically conductively and mechanically fixing to an external object, such as a contact carrier, fastened. Alternatively, the carrier and / or the attachment portion (4) may be formed in any other form.

The sliding contact body (1) shown in FIG. 1 has a frame-shaped fastening section (4) with two fastening openings on the edge, by means of which it can be fixed on a patina, for example by soldering. The sliding contact body (1) is preferably in

Small construction made. He can, for example, a

Total length of a few centimeters, here for example 2,5cm have. The length of the carrier (3) may be in the range of a few millimeters or centimeters, here for example about learning. The length of the bars (2)

(Microbridge) can also be in the range of a few

Millimeters or centimeters are and here for example 6 mm between the dorsal end (9) and the distal end (10). Alternatively, the

Sliding contact body (1) are available in significantly larger dimensions. A plurality of juxtaposed individual webs and / or web groups (6, 7, 8) form one

Comb portion. The arrangement profile of the webs and

Bar groups in a comb section can be chosen arbitrarily. Preferred arrangement profiles will be explained below. On a sliding contact body (1) a plurality of comb sections, each with a plurality of individual webs and / or web groups (6, 7, 8) may be arranged.

The overall width of a sliding contact body, i. whose extent transverse to the grinding direction (A), can be in the range of a few millimeters to centimeters, it is for example 3mm here.

The webs (2) can each have a longitudinal curvature (14) with a radius of curvature (R_L) over which the position and size of the contact zone (13) can be influenced. The radius of curvature (R_L) of the longitudinal curvature (14) can be in the range of a few millimeters to centimeters. He is in the example shown about 2-3mm. The longitudinal curvature is preferred after the formation of a

Contact bead (20) introduced by material removal and before the application of a coating, especially when low radii of curvature (R_L) are to be generated. As a result, the risk of damage to the

Coating reduced. On the sliding contact body (1) shown in Figure 1, three web groups (6, 7, 8) and two each arranged therebetween individual webs (2) are arranged. The webs contained in a web group (6, 7, 8) are connected to each other at the distal end (10). However, a connection can also be arranged at a different position between the webs. Preferably, at least one connection point (12) is provided on the distal end region (11), ie between the contact zone (13) and the distal end (10) (compare FIG. 2). In the example shown in FIGS. 1 to 5, two or three adjacent webs are mechanical with each other through one or more connecting points (12)

coupled. Alternatively or additionally, a

Connection between two non-adjacent webs (2) may be provided, for example by a bridge, which overlaps one or more intermediate webs. It can also be provided that in a row

a first and a third web are mechanically coupled by a connection point (12), while an intermediate second

Web has a shortened distal end (10) and thus does not participate in the connection (see Figure 8). In other words, a connection point (12) between two coupled webs (2) overlap one or more webs or web groups arranged therebetween. With a suitable design of the connection points (12) and / or connecting bridges, any desired webs (2) can be used.

interconnected and mechanically coupled.

Figure 3 shows a metal sheet (16), in which a plurality of sliding contact bodies (1) is incorporated. The sliding contact body (1) may preferably by

Material removal made of a metal sheet (16) and row and / or strip next to each other

and / or arranged one above the other. The production can be done, for example, by punching, laser cutting, etching or a comparable method for removing material. In order to achieve the mentioned in the introduction small dimensions for the web width (B) of less than 0.1 mm and the web spacing (D) of less than 0.1 mm, the production is preferably carried out by

Laser cutting and / or etching.

Figures 4 and 5 show two exemplary ones

Arrangement profiles (17,18) for the arrangement of

Web groups (6, 7, 8) and individual webs (25) on a sliding contact body (1). Further arrangement profiles are explained below.

The arrangement profile (17) shown in FIG. 4 has a total of nine webs (2). Of these, the three left webs (2) are combined to form a web group (6). The fifth and sixth bridge as well as the eighth and ninth

Bridge are connected to two web groups (7, 8). Between the web groups (6, 7, 8) in each case a single web (25) is provided. The connection points (12) are arranged here at the distal end (10) of the webs. They may alternatively or additionally be arranged in another area between the distal and the dorsal end (9, 10) of the webs (2). The number and arrangement of the connection points (12) as well as the number of webs (2) to be combined into a web group (6, 7, 8) can essentially be chosen arbitrarily. In the choice of the arrangement profile particular natural frequencies to be produced or avoided can be taken into account.

The arrangement profile (17) shown in Figure 4 is constructed asymmetrically with respect to the grinding direction (A). Asymmetrical arrangements are useful if as many different bridge groups (6, 7, 8) are to be provided in order to generate a corresponding number of natural frequency profiles. FIG. 5 shows an alternative example

Arrangement profile (18) with a center-symmetrical to the grinding direction (A) training. Especially at high

Relative movements between the sliding contact body (1) and the mating contact (15) can be a symmetrical

Arrangement of the webs (2) and web groups (6, 7, 8) be advantageous to the occurrence of transversely to

To reduce grinding direction (A) directed reaction forces and thus the directional stability of the

Optimize sliding contact body (1). FIG. 6 shows a sliding contact body (1) in analogy to the example of FIG. 1, contact beads (20) being arranged here on the webs (2). Again, some webs (2) to web groups (6,7,8) are summarized. Figure 7 shows an enlarged view of the detail VII of Figure 6. It can be seen that the contact bead (20) covers only a part of the width (B) of the web (2). The ratio of the bead width to the web width W / B is preferably equal to or less 3/4 and

in particular about 1/2 to 1/3. As a result, a narrow contact bead is achieved, the good

Having contacting properties (see below) and at the same time a significantly broader web is obtained, which has a good lateral stability and homogeneous Ensures spring properties. On one through

Material removal formed Kontaktwulst according to Figures 6 to 12 may additionally be arranged by welding formed Kontaktwulst. Whose shape can be chosen arbitrarily, in particular in the form of a welded strand, individual spaced from each other and arranged in a line contact points or in the form of

overlapping contact points (scaly

Arrangement). Such shapes are shown by way of example in FIG. 13 and will be explained below.

The bead width (W) is thus smaller than the web width (B). The contact bead (20) extends substantially in the grinding direction (A), i. An arrangement of contact points in a line preferably extends in the direction of grinding (A). A contact bead (20, 20

20), in particular a contact bead (20) formed by material removal, can cover the entire length of a web (2) or can be provided only in the region of the contact zone (13) or a single contact point. At one

Sliding contact bodies (1) can be provided at the same time webs (2) with and without contact bead (20).

Figures 8 and 9 show two exemplary ones

Arrangement profiles (18, 19) for a sliding contact body (1) with a plurality of webs (2) and contact beads (20) arranged thereon. In the arrangement profile shown in Figure 8 are mainly

Single webs (25) are provided, which are not interconnected or combined into web groups, and a web group (8), the one in between

Single bridge surrounds. The single bridge in between is protected by the adjacent webs of the web group (8) against lateral buckling and possibly laterally guided in strong elastic Seitenauslenkung.

Alternatively, a connection could be provided here through a bridge (see description above).

The arrangement profile (18) shown in FIG. 9 essentially corresponds to the center-symmetrical one

Arrangement profile (18) of Figure 5, but here on each web (2) a contact bead (20) is placed, which is formed by material removal.

Figures 10 to 12 show cross-sectional views of a web (2). The web (2) has a web width (B) and a web thickness (H). The web thickness (H) may preferably correspond to the thickness of a sheet (16) from which the webs (2) are made. The web thickness (H) can be selected as a function of the spring properties to be achieved and is preferably in the range of less than 0.5 mm,

especially smaller 0,1mm.

As can be seen in FIG. 10, the contact bead (20) can preferably be formed by removing material from an inlay

Cross-section rectangular bridge to be formed. In other words, the contact bead (20) of a

Residual material remaining on an outer side of a web (2) after the web edges (22, 23) have been removed. The removal of the web edges (22, 23) can be done in any way. In order to achieve the aforementioned very small dimensions (B, D, W) and in particular to produce a bead width (W), which is again significantly lower than the web width (B), a removal of the web edges (22, 23) preferably by etching or laser cutting done.

A preferred manufacturing method for a

Sliding contact body (1) according to the present invention

The disclosure of a metal sheet (16) comprises the following steps: applying a first protective lacquer to the metal sheet (16) in a pattern, wherein the first lacquer covers the areas of the support (3), if necessary

Attachment portion (4), the connecting points (12) and the contact beads (20) covered, and wherein the first resist completely an etchant withstand;

Applying a second resist to the metal sheet (16) in a pattern, wherein the second resist covers the areas of the web edges (22, 23) adjacent to the contact bead (20), and wherein the second resist one

Caustics only for a short or limited withstand;

Applying an etching liquid on the painted

Metal sheet (16) for such a period of time that the material areas of the sheet (16) between the webs (2) completely, at the web edges (22, 23) but only

partially removed. By such

Manufacturing process, a sliding contact body (1) according to Figures 6 to 10 are produced. It may additionally be provided, at least in the region of the contact zone (13) or one or more

Single contact points apply a coating.

Alternatively, the manufacturing process can be carried out on a coated sheet.

When etching away the web edges (22, 23), the etchant can also the edge region of the contact bead (20) under the Remove the first protective varnish so that the transverse rounding with the mean rounding diameter (Q_R) is formed. The process parameters are preferably selected such that the rounding diameter (Q_R) is less than 0.1 mm, in particular less than 0.5 mm.

The first resist may be applied in the form of a dot pattern or dots arranged in a row, and the second resist may be applied in the form of a frame surrounding the dots, which has the desired width of a web (2). In such a case, in the region of the points from the first protective lacquer, material regions may remain standing which form a contact bead in the form of contact points (cf.

FIGS. 13 and 15), while in the region of overlap by the second protective lacquer, wider regions of the web (2) remain.

As a base material for the webs (2) may preferably be used a spring steel, in particular one of the above materials. This one can go up with one

precoated conductive material layer.

Alternatively or additionally, an (additional) coating (24) can be applied to the base material before or after the cutting or etching of the basic shape for the sliding contact body (1). For example, a coating (24) may improve the friction properties and / or reduce the contact resistance. For the coatings are especially nickel and

Copper coatings or other precious metal coatings into consideration. Depending on the intended use and / or the electrical requirements may also apply a coating can be dispensed with. For the

Base material can also be used spring stainless steels, which have a higher corrosion resistance and / or a higher edge hardness. A coating is particularly preferably applied by electroplating, with layer thicknesses of about 0.03 mm usually being achievable. Preferably, larger layer thicknesses are produced.

FIG. 11 shows a preferred embodiment of a web (2) on which first a contact bead (20) is formed and subsequently a coating (24) is applied. This form of production has the advantage that the coating (24) and that of the contact surface

groundbreaking flanks of the Kontaktwulsts (20) covered, which possibly. An improved adhesion can be achieved.

The application of an (additional) coating (24) after the formation of a contact bead (20) also has positive effects on the life or

Wear resistance of Schleifkontaktkorpers, which is explained below. FIG. 12 shows, by way of example, a cross-section of a web (2) with a contact bead (20) and a coating (24) after a longer period

Grinding stress.

Due to the abrasive contact is first the

Coating (24) in the area of the end face of the

Contact bead (20) rubbed off. Subsequently, the end-face base material of the contact bead (20) comes to the grinding contact with the mating contact (15). The arranged at the obliquely or perpendicular to the grinding plane Flanks of Kontaktwulsts (20) applied

Coating parts (24) remain largely preserved and can continue to the electrical

Contact or the grinding will get regenerative effect. In this way, in particular, it is avoided that the volume resistance abruptly deteriorates when the coating (24) fails or is ground down in the forehead area. This leads to an extension of the service life and / or the possibility of thinner ones

To provide layer thicknesses for the coating (24) and thus to reduce costs. When the contact bead is in the form of one or more contact points (26) (see above), it has substantially four oblique

Flanks on (two parallel to the grinding direction and two transverse to the grinding direction (A)). As a result, after the end face has been sanded, more or more material regions of the coating 24 are obtained, so that the contacting behavior is further improved. FIG. 13 shows an arrangement profile for a

Sliding contact body (1) with two edge-side

Web groups (6, 8), between which a plurality of individual webs (25) are provided. The edge-side web groups (6, 8) have over the individual webs (25) an increased

Lateral stability on. This has advantages in the operation of the sliding contact body (2) and in particular during assembly. When handling, storing, transporting and / or installing sliding contact bodies are on

most common or easiest the marginal

Single webs (25) kinked. The provision of

marginal web groups (6, 8) increases the Resistance of the sliding contact body (2), even no special requirements with regard to the frequency characteristics exist.

Various advantageous embodiments for a contact bead (20 2 0) produced by micro laser welding are shown by way of example on the sliding contact body (2) according to FIG. On the two left webs of the web group (6) are welded

Contact beads ( ^20x ) shown in strand form. Such strands can be produced by continuously applying the highly conductive material during a relative movement between the welding applicator and the web.

At the two right webs of the web group (8) Kontaktwulste (2 0) are shown by a scaly arrangement of individual welded contact points

(26) are formed. Such a contact bead (2 0) can by intermittently applying the highly conductive material during a relative movement between

Welding applicator and web are generated. The individual webs shown in FIG. 13, which are counted from the left at positions three, four, six and seven, each show a contact bead (20 ^× ) which is formed by a plurality of spaced-apart welded contact points (26). By a relatively large-spaced spacing of the contact points (26), a particularly small change in the properties of the base material of the web (2) is achieved. Furthermore, after the welding on of the contact points (26), the web (2) can still be readily mechanically deformed, in particular for producing a Longitudinal curvature (see Figures 1, 6 and 7), without the weld or internal structure of the Kontaktwulstes (20) is impaired during bending or rolling of the web. The scaly arrangement of the contact points as shown on the right-hand webs of the web group (8) optionally forms a compromise solution between a large contact surface on the one hand and good on the other hand

Deformability of the web or minimization of the

Property changes of the base material. FIG. 14 shows a cross section of a web (2), in particular of a microbridge, which is produced, for example, by etching or laser cutting from a metal sheet and has a substantially rectangular cross section with a flat surface. The web edges (22, 23) may optionally be rounded as a result of the etching or laser cutting process (see explanation above). However, the web shown here (2) has no through

Material removal formed contact bead (20).

Instead, a contact bead (20 ^× ) is formed exclusively by welding on a contact point (26). The micro-laser deposition welding is preferably carried out such that a laser beam is directed onto the upper side of the web (2), which welds the base material. A highly conductive material is produced by the

Spray applicator in powder form sprayed onto the welded area. The powder particles are melted by the laser beam, with the first

supplied particles with the welded

Mix the base material of the bridge (2). By further feeding and melting of powder material, the mixing decreases rapidly, so that the more outward lying material areas of the contact point (26) consist essentially of the pure material of the additive. The dosage of the radiation energy supplied by the laser can be reduced after the first melting of the base material, so that the

Radiant energy essentially only that

Melting of the per unit time supplied powder causes. This ensures that the

Melting zone reinforced to form the outside and in the

Tapered cross-section, so that the formation of a hemisphere ^¬ or lens shape is favored. Furthermore, the formation of the radius Q_R of the transverse rounding can be influenced within limits by the choice of the radiation energy and the amount of powder supplied per unit time. Preferably, at the end of the welding process, the feeding of the powder is first stopped or greatly reduced and then the (optionally in the radiation dose

reduced) laser beam switched off. As a result, the formation of a spherical rounding of the contact point (26) is promoted during solidification and the formation of peaks or edges is avoided. Furthermore, the

Homogeneity during recrystallization favors, which counteracts internal stresses and the formation of grain boundaries in the structure. The individual web (25) shown in FIG. 13 at the middle position has a first contact bead (20) formed by removal of material, on which in addition one

Contact bead (20) in the form of a series of

Contact points (26) is welded. Figure 16 shows an associated cross-sectional view. Such Although superposition of contact beads (20, 20) requires a particularly high accuracy in the positioning of the contact points (26), but on the other hand combines the above-mentioned advantages. Both of the

Material removal formed Kontaktwulst (20) with

strand-like extension and the welded contact points (26) provide good deformability and retention of the spring properties of the web (2). Furthermore, during operation, the free height (H_F) between the

Counter contact and the laterally over the contact bead (20, 20) projecting portions of the web (2) are increased. Thus, more space for the attachment of dirt or debris on the mating contact or the sliding contact body is created, which the

Susceptibility to a fouling failure reduced.

Figure 15 shows a preferred embodiment of a sliding contact body (1), the only single webs (25) produced by micro-deposition welding

Contact beads (20), in particular in the form of

Having contact points (26). Alternatively, the

Contact points (26) produced by selective removal of material with an etching process (see above) and subsequently coated. An inventive sliding contact body (1) may preferably be arranged in a transmission device for transmitting electrical currents. Such

Transmission device can in particular for the

Transmission of high power currents - for example, in the aforementioned wind turbines - or for the precise Transmission of signal streams - for example at

Measuring devices - be provided. It may in particular be formed as a brush block with a plurality of sliding contact bodies (1), wherein the sliding contact bodies (1) are arranged such that their contact zones (13) lie on a circular envelope. With such

Brush blocks can be brought into contact with rotationally symmetrical mating contacts with a plurality of electrically parallel sliding contact bodies in order to transmit very high power in a minimal space.

Alternatively, the sliding contact body (1) in

be used in any other forms of transmission devices.

The invention can be modified and expanded in various ways. In particular, the described and / or illustrated features of the invention may be combined, interchanged, expanded or omitted in any manner.

On a sliding contact body (1) a plurality of webs (2) in the grinding direction (A) can be arranged behind one another or offset from each other, wherein a plurality of contact zones (13) can be provided. It is also a

scale-like arrangement of the webs possible. At a web, a plurality of contact beads (20) may be provided. One or more contact beads (20) may be arranged off-center on a web (2), in particular in the region of a web edge (22, 23).

The web width (B) and / or the bead width (W) and / or the web length between the dorsal and distal end can within the webs (2) or within the web groups on a sliding contact body (1) uniformly or

be chosen differently. Uniform bead widths

(W) and bridge lengths have advantages in terms of the

Production and handling. By providing

different web widths (B) and / or bead widths

On the other hand, (W) can influence the

Frequency behavior done.

One or more contact points (26) can also be welded onto the sloping flanks of a contact bead (20) produced by removal of material.

A method for producing a sliding contact body according to the present invention may be in any

Order and combination include the following steps:

- Providing a sliding contact body according to the preamble of the main claim by material removal from a metal sheet, in particular by etching and / or laser cutting; - Producing one or more Kontaktwulste (20) by material removal on a web (2), in particular by etching away or laser cutting;

Producing one or more contact beads (20) by micro-laser deposition welding on a web (2),

in particular by supplying a highly conductive

Additive and, if necessary, changing the

Radiation dose and / or added amount of additive per unit time, wherein the additive is preferably supplied in a powder via a nozzle at the welding applicator.

- Applying a coating on a formed by material removal contact bead (20), in particular by electrodeposition of a plurality of layers.

LIST OF REFERENCE NUMBERS

Sliding contact body

contact web

carrier

attachment section

flexible support area

Bridge group / contact group

Dorsal end

Distal end

Distal area

connection

Contact zone

longitudinal curvature

Counter contact / slip ring / slideway sheet metal

Arrangement profile asymmetrical

Arrangement profile symmetrical

Arrangement profile without web groups

Kontaktwulst

Contact bead (welded on strand)

Contact bead (welded on as a dot row)

cross rounding

web edge

coating

Single bridge

Contact point / hemispherical or lens shape A grinding direction / relative movement

B bridge width

D bridge distance

D_ _K diameter contact point

H web thickness / sheet thickness

H_ _F Free height

R_ _L radius of curvature d. longitudinal curvature

R_ _Q radius of curvature d. transverse curvature

W bead width

Claims

Sliding contact body for transmitting electrical currents to a mating contact (15), wherein the

Sliding contact body (1) has a support (3) and a plurality of webs (2) which can be applied resiliently to the mating contact and which are connected to the support (3) at their dorsal end (9), and wherein the webs (2) Region of a between the dorsal end (9) and the distal end (10) provided contact zone (13) are spaced apart and one or more webs (2) in the region of the contact zone (10) have a contact bead (20), characterized zei marked in that a contact bead (20) is formed by removal of material from a cross-sectionally rectangular web and has a coating (24) applied after the production of a contact bead (20) or that

Contact bead (20 20) is produced by applying a conductive contact material by micro-laser welding.

Sliding contact element according to claim 1, characterized in that at least two webs (2) are rigidly connected to one another in the region between the dorsal end (9) and the distal end (10) to form a web group (6, 7, 8).

Schleifkontaktkorper characterized according to claim 1 or 2 characterized zei chnet that one or more or all webs (2) are formed as micro-webs with a web width of 0.25 mm or less. Schleifkontaktkorper according to any one of the preceding claims, characterized zei marked that the coating (24) or the applied contact material is a precious metal, in particular a gold alloy.

Sliding contact element according to one of the preceding claims, characterized in that the applied contact material is an AuCo hard gold alloy.

The sliding contact body according to one of the preceding claims, characterized in that the applied contact material has a bead height of more than 0.03 mm and less than 0.15 mm, in particular between 0.05 mm and 0.12 mm.

The sliding contact body according to one of the preceding claims, characterized in that the applied contact material has a bead width of more than 0.03 mm and less than 0.15 mm, in particular between 0.05 mm and 0.1 mm.

A sliding contact body according to one of the preceding claims, characterized in that a contact bead (20, 20-20) is arranged in a row by a chain of two or more

Contact points (26) is formed.

9.) sliding contact body according to one of the preceding

Claims, characterized in that a contact point (26) is formed by material removal, in particular by partial etching away of surface areas of a web.

10.) sliding contact body according to one of the preceding

Claims, characterized in that a contact point (26) is welded and in particular made of a AuCo hard gold alloy. 11.) sliding contact body according to one of the preceding claims, characterized in that a coating (24) at least one edge of a formed by material removal Kontaktwulstes (20) or contact point (26) covered. 12.) sliding contact body according to one of the preceding claims, characterized in that a contact bead (20) is formed from a residual material remaining on an outer side of a web (2) after etching removal of the web edges (22,23). 13) sliding contact body according to one of the preceding claims, characterized in that a contact bead (20) consists of a residual material on an outer side of a web (2) according to

Removal of the web edges (22, 23) with laser cutting remains.

14.) sliding contact body according to one of the preceding

Claims, characterized in that the width (W) of a contact bead is smaller than the width (B) of a web (2), in particular in a ratio W / B of 3/4 or less.

15.) sliding contact body according to one of the preceding

Claims, characterized in that the width (B) of a web (2) is equal to or smaller than 0.1 mm, in particular between 0.05 mm and 0.08 mm. 16.) sliding contact body according to one of the preceding claims, characterized in that the distance (D) between two webs (2) is equal to or less than 0.1 mm, in particular between 0.05 mm and 0.1 mm. 17) sliding contact body according to one of the preceding claims, characterized in that a contact bead (20, 20 20) has a middle

Radius of curvature (R_Q) equal to or less than 0, has 05mm. 18) Schleifkontaktkorper according to any one of the preceding claims, characterized in that it e e chnet that a contact bead (20) with respect to the grinding direction has a transverse rounding.

19.) sliding contact body according to one of the preceding claims, characterized marked zei chnet that on or on a web (2) a plurality of contact beads (20) are arranged. Schleifkontaktkorper according to any one of the preceding claims, characterized in that the sliding contact body (1) has a plurality of

Web groups (6, 7, 8). 21.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that the sliding contact body (1) has at least one single web (25).

22) Schleifkontaktkorper according to any one of the preceding claims, characterized in that the sliding contact body (1) at least two web groups (6, 7, 8) with different numbers of

having connected webs (2).

23.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that two webs (2) by a plurality of connection points (12) are connected.

24.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that two adjacent webs (2) are connected.

25.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that a connection point connects two webs (2) omitting one or more intermediate webs.

26.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that an asymmetrical arrangement profile (17) for the

Web groups (6, 7, 8) and / or individual webs (25) is provided.

27) Schleifkontaktkorper according to any one of the preceding claims, characterized in that the webs (2) and web groups (6, 7, 8) in the region of the contact zone (13) center symmetrical to

Abrasive direction (A) are arranged.

28.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that the sliding contact body (1) consists of a spring steel, in particular a precious spring steel. 29) Schleifkontaktkorper according to any one of the preceding claims, characterized in that the webs (2) and the carrier (3) are made of a single metal sheet (16).

30.) Schleifkontaktkorper according to any one of the preceding claims, characterized in that the

Sliding contact body is made of a precoated metal sheet (16).

31.) sliding contact body according to one of the preceding

Claims, characterized in that the web widths (B) of the webs (2) of a contact body

(1) are chosen differently, in particular for setting different natural frequencies.

32.) sliding contact body according to one of the preceding

Claims, characterized in that the base material of the sliding contact body is a cobalt-nickel-iron alloy with about 17% by weight of cobalt, 28% by weight of nickel.

33.) sliding contact body according to one of the preceding

Claims, characterized in that the base material of the sliding contact body is a CuBe2 beryllium copper alloy. 34.) Transmission device for transmitting electrical currents between two relatively moving

Contact partners (1, 15) via a grinding

Contacting, characterized in that the transmission device at least one

Sliding contact body (1) according to one of

preceding claims.

35.) Transmission device according to claim 26, characterized in that the

Transmission device is designed as a brush block with a plurality of sliding contact bodies (1), wherein the sliding contact body (1) are arranged such that their contact zones (13) on a

annular envelope lie.

36.) Process for the preparation of a

Sliding contact body (1) according to the preamble of

Claim 1 of a metal sheet (16), comprising the following steps: Providing the sliding contact body (2) by removing material from a metal sheet, in particular by laser cutting or etching;

Producing a contact bead (20, 20 20) on a web (2) by material removal or

Micro laser deposition welding. Method according to the preceding claim,

characterized by the following steps:

Applying a first protective coating on the metal sheet (16) in a pattern, wherein the first lacquer areas of the support (3), if necessary. Of the attachment portion (4), the

Covering points (12) and the contact beads (20) covered, and wherein the first resist completely an etchant withstand;

Applying a second protective lacquer to the metal sheet (16) in a pattern, wherein the second lacquer covers the regions of the web edges (22, 23) adjacent to a contact bead (20) or between contact points (26) provided for forming the contact bead (29), and wherein the second resist is an etchant only

short-term or limited withstand; Applying an etching liquid on the

coated metal sheet (16) for such a period of time that the material areas of the sheet (16) between the webs (2) completely, at the web edges (22,23) and, if necessary, between the

Contact points (26) but only partially removed.