EP2099102B1 - Method for manufacturing a contact unit and contact unit - Google Patents

Description

The invention relates to a method for producing a contact unit and a contact unit, in particular brush unit, with at least one contact piece, at least one connection conductor and at least one damper element with rubber-elastic properties, wherein a recess is formed in a surface of the contact piece to form the damper element and subsequently the recess is filled at least partially with an elastically hardenable potting compound.

Such contact units or brush units are well known and are used for example for contacting a commutator or slip ring of an electric motor. A contact piece consists essentially of graphite with various admixtures as electrode material, wherein a connecting conductor is formed as a strand and is fixed in or on the contact piece for transmitting electrical energy. The contact piece continues with a contact side on the commutator or slip ring of the electric motor, wherein by a rotation of the commutator or slip ring, the contact piece through Abrasion worn or used up. Also, the wear of the contact piece is significantly influenced by the so-called brush fire. Brush fire may, among other things, result in evaporation of electrode material of the contact piece and further increase in wear roughening of a Kommutatorgleitfläche. The unwanted brush fire can be caused for example by vibrations of the electric motor or non-circularity of the commutator or slip ring. Therefore, to dampen any vibrations of a contact piece and thus to avoid brush fire, contact pieces are regularly provided with damping elements. The damper elements are glued to the contact piece of a contact unit, which was produced in an integrated manufacturing process, subsequently.

The production of a contact unit takes place, starting from a contact piece blank or graphite molded article, in a manufacturing center, wherein first the contact piece blank are provided with bores for receiving a connecting conductor and optionally an interruption device or a sensor element. Subsequently, the connecting conductor is inserted into the bore and a gap between the connecting conductor and a bore wall is filled with a filling material, so-called stamping powder, wherein the stamping powder is solidified during a filling by means of a, surrounding the connecting conductor, a ramming exporting, tube. Finally, the stamping powder is sealed with a liquid covering compound, covering a bore opening between the connecting conductor and the contact piece. The covering compound is applied in a metered manner with the aid of a delivery tube, forms a liquid meniscus between the connection conductor and a contact piece surface and finally cures. The sticking of a damper element or a damping rubber and the damper element optionally additionally covering hard tissue support is now below the integrated production in a separate Production step. The cost of the damper element or its application are relatively high in relation to the cost of producing a contact unit without damper element.

From the US 2,866,112 is known a contact piece with two connecting conductors, wherein the connecting conductors are each received in holes and fixed with a filling material therein. The holes are provided with a further recess or reduction, which is filled with a potting compound. After curing of the potting compound, this serves as a damper element for damping a transverse movement of the respective connecting conductor.

The DE 1 488 674 also discloses a contact piece with a damper element, wherein in the contact piece a longitudinal groove is formed with undercuts in which the matching trained damper element can be used and positively fastened.

The EP 0 723 318 A2 relates to a design of a breaker device or a spring-biased shut-off nipple and a sensor element or a message cord in a contact piece.

From the FR 2,102,627 goes out a contact piece, in which a fixed in the contact piece of wire is surrounded by a recess which is formed as a circular ring.

Also, a contact piece with a damper element shows the DE 30 29 041 A1 wherein the damper element is made of silicone rubber and is arranged as a ring around an exit end of a strand from the contact piece. The damper element also serves to support the strand.

The document US4075524 discloses a method according to the preamble of claim 1. It is therefore an object of the invention to propose a method for producing a contact unit or a contact unit, which enables a cost-effective production of a contact unit with damping properties.

This object is achieved by a method for producing a contact unit having the features of claim 1 and by a contact unit having the features of claim 18.

In the inventive method for producing a contact unit having the features of claim 1, in particular brush unit, with at least one contact piece, at least one connection conductor and at least one damper element is formed to form the damper element a recess in a surface of the contact piece, and subsequently the recess with a elastically solidified potting compound at least partially filled. The potting compound is substantially solidified after filling the recess and forms a damper element with rubber-elastic properties.

The inventive method allows the integration of the formation of the damper element in the conventional method for producing a contact unit, without the need for a further separate handling of the contact unit or a prefabricated damper element would be connected, which must be applied to the contact unit. Rather, the damper element is formed in connection with the production of the contact unit; represents an intermediate to the process immanentes.

This results in an immediate cost savings by dispensing with additional, complex production facilities and the resulting time savings.

• Ausbilden zumindest zweier Ausnehmungen im Kontaktstück,
• Anordnen des Anschlussleiters in einer ersten Ausnehmung,
• Befüllung der ersten Ausnehmung mit Füllmaterial,
• Aufbringen einer Abdeckmasse auf das Füllmaterial,
• Einbringen einer Vergussmasse in eine zweite Ausnehmung und Ausbildung des Dämpferelements durch Verfestigung der Vergussmasse.

An advantageous development of the method may comprise the following method steps:

• Forming at least two recesses in the contact piece,
• Arranging the connection conductor in a first recess,
• Filling the first recess with filling material,
• Applying a covering compound to the filling material,
• Introducing a potting compound in a second recess and forming the damper element by solidification of the potting compound.

The aforementioned method steps allow the formation of a damper element in the context of an integrated manufacturing process for a contact unit, whereby the costs for the production of the contact unit with the damper element compared to the methods known from the prior art can be significantly reduced. In particular, by the formation of at least two recesses in the contact piece so a first recess for the arrangement and attachment of the connecting conductor, as in the known manufacturing process, are provided. A second, complementary recess can be filled with a potting compound, wherein the potting compound is substantially solidified after filling and so can form a damper element with rubber-elastic properties. If the introduction of the potting compound into the second recess occurs at the same time or immediately following the application of the covering compound to the filling material, the formation of the damping element in one working step or in a working position within an integrated manufacturing center is possible.

Also, it proves to be particularly advantageous if the recesses are formed in one step. Thus, the recesses may be formed simultaneously or immediately thereafter by a material-removing manufacturing process, such as drilling, milling, grinding, etc., within a work step or in a machining arrangement of the machining center.

It proves to be particularly advantageous if at least one further recess is formed in the contact piece. The formation of the further recess can be easily integrated in the manufacturing process, wherein the further recess can serve to receive a supplementary sensor element, connecting conductor or other devices and elements in the contact piece.

In a particularly advantageous embodiment of the method, an interruption device can be used in a recess before the introduction of the potting compound. A breaker may disconnect the contactor from a commutator or slip ring prior to achieving critical contact patch wear, thereby avoiding damage to the commutator or slip ring by the contactor unit. If a sufficient depth in the contact piece is provided for the recess of the interruption device, potting compound for forming a damper element can be introduced in a recess region remaining over the interruption device without a separate recess having to be formed for the formation of the damper element.

If potting compound is introduced into two recesses, two muffler elements can be formed simultaneously. This can be useful, in particular, when the contact unit is arranged relative to a pressure element which exerts a pressure force for contacting the contact unit to a commutator or slip ring on two contact points of a contact side of the contact piece.

In one embodiment of the method, a further recess can be formed in the contact piece, in which a sensor element is arranged. The contact unit can be easily equipped with an additional sensor element, for example, to detect contact piece wear as part of the ongoing manufacturing process.

In one embodiment of the method, a further recess can be formed in the contact piece, in which a further connection conductor is arranged. The contact unit then has at least two connection conductors, which ensure a particularly secure contacting of the contact piece.

It proves to be particularly advantageous if at least one recess is formed as a bore. A bore diameter can be particularly easily adapted to a diameter of a connection conductor, an interruption device or a sensor element. In addition, a hole is particularly inexpensive and easy to produce.

If a recess at least partially formed as a circular ring, potting compound for forming one or more damper elements can be introduced in the annulus or in circular ring sections. One, a central annulus diameter adapted spiral spring can be used as a pressure element in the annular recess in the contact piece, the coil spring is advantageously positioned positively on the contact element.

In one embodiment of the method, at least one recess can be formed as a slot. A slot can be particularly easily formed by means of a saw blade, shank or side milling cutter in the contact piece. Also can be used with a slot much of a surface of the contact side of the contact unit to form a damper element with a relatively large surface area.

It proves to be particularly advantageous if the recess is formed with a circular segment-shaped cross-section. Thus, the recess can then be formed along a longitudinal axis of the contact side of the contact piece or in the direction of a transverse axis, wherein on a bottom surface of the recess, the potting compound partially is applied. With appropriate viscosity and cohesion of the potting compound a lateral leakage of the potting compound from the recess can be prevented beyond, the potting compound can then be solidified as a drop to a damper element. Also, the circular segment-shaped cross-section of the recess allow a particularly secure receiving a pressure element such as a pressure finger.

If the covering compound and the potting compound are applied in one working step, for example by means of different application organs, which are positioned relative to the contact piece, the contact unit can be formed with a particularly high time saving and with little additional effort of a production center.

Taking advantage of the viscosity and the cohesion of the potting compound, a quantity potting compound can be introduced into the recess, such that an abutment side of the contact piece is surmounted by the potting compound. The then formed by solidification damper then also dominates the plant side. A contact pairing between damper element and a pressure element can then be made particularly simple.

If the potting compound is provided with a support element before it solidifies to form a damper element, the contact unit can additionally be equipped with a support element without the need for a separate work step, such as, for example, bonding of the support element. The support element can substantially cover the contact piece at least partially, wherein a gap remains between the support element and the contact piece is at least partially filled by the potting compound or the damper element.

In one embodiment of the method can be used as covering compound potting compound. Thus, on the working of the Applying the covering be omitted, which further reduces the production cost. In this case, the potting compound fulfills the function of the covering compound.

In a further embodiment, silicone can be used as potting compound. Silicone can be provided inexpensively in the required viscosity and quantity. Further, a solidification of the silicone can be done independently, but the silicone can still remain sufficiently elastic to act as a damper element.

The contact unit according to the invention with the features of claim 18, in particular brush unit, has at least one contact piece with at least one connection conductor and at least one damper element, wherein a recess in a surface of the contact piece is formed to form the damper element, and the recess with an elastically solidified potting compound at least partially filled. Such a trained contact unit allows a particularly simple and inexpensive production thereof, since the damper element does not need to be glued separately.

In an advantageous embodiment of the contact unit, at least two recesses may be formed in the contact piece, in which case the connection conductor may be arranged in a first recess, the first recess may be filled with filling material, a covering compound may be applied to the filling material, and wherein second recess potting compound may be introduced and solidified to form the damper element. Thus, as part of an integrated production of the contact unit, by forming an additional recess, introducing a potting compound into the recess and their solidification on the contact piece, a damper element can be formed particularly cost.

In a particularly advantageous embodiment of a contact unit, the first and the second recess may be arranged on a common center axis. Both recesses can then be easily manufactured in one operation, since the positions of the recesses on the contact piece do not differ significantly from each other.

In a development of the embodiment, the first and the second recess may be arranged concentrically. Both recesses can then be introduced into the contact piece in a single working movement with, for example, a drill or milling cutter in the form of a countersink. A first lower recess with a relative to a second upper recess smaller diameter can then serve to receive a connecting conductor, wherein after attachment of the connecting conductor, the second upper recess can be filled with potting compound. A surrounding the connection conductor damper element can be particularly easily formed.

In one embodiment, the first recess may be arranged on a side surface and the second recess on a contact side of the contact piece. Thus, a customized to a variety of installation situations contact unit can be formed. In particular, the connection conductor can be arranged on the side surface of the contact piece, in which case the second recess on the contact side of the contact piece can serve to form or arrange the damping element. The contact side of the contact piece is then not broken by a contact pair with a pressure element possibly interfering conductors.

It proves to be particularly advantageous if the contact unit has a plurality of contact pieces. The contact unit can then be formed by means of mutually bonded to side surfaces contact pieces. Thus, multi-part contact units can be formed with the known from the prior art advantageous effects of such contact units.

Further advantageous embodiments of a contact unit resulting from the feature descriptions of the back to the method claims 1 to 14 dependent claims.

In the following the invention will be explained in more detail with reference to the accompanying drawings.

Fig. 1

eine erste Ausführungsform einer Kontakteinheit aus dem Stand der Technik in einem Längsschnitt;

Fig. 2

eine zweite Ausführungsform einer Kontakteinheit aus dem Stand der Technik in einem Längsschnitt;

Fig. 3

eine dritte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 4

die dritte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 5

eine vierte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 6

die vierte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 7

eine fünfte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 8

die fünfte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 9

eine sechste Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 10

die sechste Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 11

eine siebte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 12

die siebte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 13

eine achte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 14

die achte Ausführungsform einer Kontakteinheit in einem Längsschnitt,

Fig. 15

eine neunte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 16

die neunte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 17

eine zehnte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 18

die zehnte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 19

eine elfte Ausführungsform einer Kontakteinheit in einer räumlichen Teildarstellung;

Fig. 20

die elfte Ausführungsform der Kontakteinheit in einem Längsschnitt;

Fig. 21

eine zwölfte Ausführungsform einer Kontakteinheit in einem Längsschnitt;

Fig. 22

eine dreizehnte Ausführungsform einer Kontakteinheit in einem Längsschnitt;

Fig. 23

eine vierzehnte Ausführungsform einer Kontakteinheit in einem Längsschnitt.

Show it:

Fig. 1

a first embodiment of a contact unit of the prior art in a longitudinal section;

Fig. 2

a second embodiment of a contact unit of the prior art in a longitudinal section;

Fig. 3

a third embodiment of a contact unit in a partial spatial representation;

Fig. 4

the third embodiment of the contact unit in a longitudinal section;

Fig. 5

a fourth embodiment of a contact unit in a partial spatial representation;

Fig. 6

the fourth embodiment of the contact unit in a longitudinal section;

Fig. 7

a fifth embodiment of a contact unit in a partial spatial representation;

Fig. 8

the fifth embodiment of the contact unit in a longitudinal section;

Fig. 9

a sixth embodiment of a contact unit in a partial spatial representation;

Fig. 10

the sixth embodiment of the contact unit in a longitudinal section;

Fig. 11

a seventh embodiment of a contact unit in a partial spatial representation;

Fig. 12

the seventh embodiment of the contact unit in a longitudinal section;

Fig. 13

an eighth embodiment of a contact unit in a partial spatial representation;

Fig. 14

the eighth embodiment of a contact unit in a longitudinal section,

Fig. 15

a ninth embodiment of a contact unit in a partial spatial representation;

Fig. 16

the ninth embodiment of the contact unit in a longitudinal section;

Fig. 17

a tenth embodiment of a contact unit in a partial spatial representation;

Fig. 18

the tenth embodiment of the contact unit in a longitudinal section;

Fig. 19

an eleventh embodiment of a contact unit in a partial spatial representation;

Fig. 20

the eleventh embodiment of the contact unit in a longitudinal section;

Fig. 21

a twelfth embodiment of a contact unit in a longitudinal section;

Fig. 22

a thirteenth embodiment of a contact unit in a longitudinal section;

Fig. 23

a fourteenth embodiment of a contact unit in a longitudinal section.

Fig. 1 shows a known from the prior art contact unit 10, which is formed from a contact piece 11, a connecting conductor 12 and a damper element A strand end 14 of the connection conductor 12 is inserted in a recess 15 formed in the contact piece 11 as a bore, wherein an annular gap 16 between the strand end 14 and a bore wall 17 is filled with priming powder 18. The stamping powder 18 was compressed during backfilling, such that the stranded end 14 is now firmly connected to the contact piece 11. In the region of a bore opening 19 of the bore 15, a covering compound 20 is applied to a side surface 21 of the contact piece 11, the recoating powder 18 and the bore opening 19 overlapping. Since the covering compound 20 was first applied in the liquid state, the covering compound 20 is formed with a meniscus-shaped surface 22 between the side surface 21 and the strand end 14. After applying the covering compound 20 was an independent solidification of the same. On a contact side 23 of the contact piece 11, the damper element 13 is fixed by means of an adhesive layer 24. A pressure element not shown here, such as a spring or a spring-actuated pressure finger of a brush holder, can exert a compressive force on the damper element 13 made of a rubber-like material. The contact piece 11 is then pressed in the direction of the fine image with a contact side 25 on a running surface, not shown here, of a commutator or slip ring for transmitting electrical energy. If a detachment of the contact unit 10 from the commutator occurs due to, for example, eccentricities of the commutator, the oscillation of the damping element 13 is achieved by means of the damper element 13 Contact unit 10 is substantially prevented relative to the commutator, whereby an undesirable brush fire is avoided.

An embodiment of a contact unit 26, which is also known from the prior art, is known in Fig. 2 shown. A contact piece 27 is here provided with bores 28, 29 and 30 formed recesses, wherein in the bore 28, a sensor element 31 with a sensor conductor 32, in the bore 29, a connection conductor 33 and in the bore 30, an interruption device 34 is arranged. An abutment side 35 of the contact piece 27 covering a damper element 36, the sensor conductor 32 and the connection conductor 33 surrounding, secured by means of an adhesive layer 37 on the plant side 35. The sensor element 31 is used to detect a state of wear of the contact piece 27, wherein upon contact of an end insulation 38 of the sensor element 31 with, for example, a commutator reaching the respective state of wear is signaled. The interruption device 34 has a shut-off pin 39, a helical compression spring 40 and a partition plate 41. In a wear of the contact piece 27 to a bottom 42 of the bore 30, the helical compression spring 40 pushes the Abschaltstift 39 out of the bore 30 and thus lifts the contact piece 27 of, for example, a commutator, which causes a shutdown of the corresponding device, and thus a Damage to the commutator is prevented by excessive wear of the contact piece 27. Further, the bore 30 is filled in a region between the partition plate 41 and the adhesive layer 37 with 35 Einstampfpulver. Depending on the design of a contact unit, this filling can also be dispensed with.

In the in the Fig. 3 to 23 the embodiments of a contact unit shown corresponds to the formation of the respective connection conductors, sensor elements or interruption devices substantially in the Fig. 1 and 2 described embodiments thereof.

The 3 and 4 show a contact unit 44 with a connecting conductor 45 which is inserted in a recess formed as a bore 46 and secured by means of stamping powder 47 and covering compound 48 therein. A second formed as a bore 49 recess is filled with a damping element 50 forming a potting compound. The damper element 50 in this case surrounds the connection conductor 45, as a result of which additional fixing of the connection conductor to the contact piece 51 is achieved. A compression spring, not shown here, for exerting a compressive force on the contact unit 44 can be brought to bear against the damper element 50, the connection conductor 45.

Like from the FIGS. 5 and 6 shows a contact unit 52 in a contact piece 53 has three holes 54, 55 and 56, wherein in the bore 55 a connection conductor 57 and in the bore 56 an interruption device 58 is inserted. The bore 54 and a hole section 59 of the bore 56 remaining above the interrupting device 58 are each provided with damping elements 60 and 61, respectively, formed from potting compound introduced into the bores 54 and 56. Due to a cohesion of the potting compound, the damper elements 60 and 61 project beyond an abutment side 62 of the contact piece 53. The damper elements 60 and 61 can thus be brought into contact with a pressure element, not shown here.

The FIGS. 7 and 8 show a contact unit 63 in which in a contact piece 64 two holes 65 and 66 are formed. In the bore 65, a connection conductor 67 is inserted and in the bore 66, a damper element 68 is introduced by introducing and solidifying potting compound. The damper element 68 projects beyond an abutment side 69 of the contact piece 64 and is arranged essentially in the centroid of the abutment side 69.

The FIGS. 9 and 10 show a contact unit 70 with a contact piece 71, wherein in the contact piece 71 an annular recess 72 is formed. A connection conductor 73 is formed in a hole 74 as a Recess attached. The recess 72 is arranged rotationally symmetrical to the bore 74 and thus forms a pin 75 of the contact piece 71. In segments 76 and 77 of the recess 72 each have a damper element 78 and 79 formed by introducing and solidification of potting compound. A compression spring, not shown here can be used so surrounding the pin 75 in the recess 72 and held in this, wherein a damping by means of the damper elements 78 and 79, respectively.

The FIGS. 11 and 12 show a contact unit 80 with a contact piece 81 in which a recess as a bore 82 and two further recesses 83 and 84 are formed with a circular segment-shaped cross-section. In the recesses 83 and 84 respectively drop-shaped damper elements 85 and 86 are arranged, wherein a corresponding viscosity of the damping elements 85 and 86 forming potting compound prevents flow of the potting compound from the recesses 83 and 84 before solidification. The illustrated arrangement of the damper elements 85 and 86 is particularly suitable for the use of, for example, pressure fingers as a pressure element.

The FIGS. 13 and 14 show a simplified representation of a contact unit 87 with a contact piece 88 and a damper element 89. Possible arrangement positions 90 and 91 of a connecting conductor, not shown here are indicated by dashed lines corresponding to a Anschlußleitermitittenachse. The formation of a recess for the connection conductor is also not shown. A recess is formed here as a slot 92 with a circular segment-shaped cross-section in the contact piece. The slot 92 is completely filled by the damper element 89.

In the FIGS. 15 and 16 a contact unit 93 is shown with a contact piece 94, wherein formed in the longitudinal direction of an abutment side 95 a recess 96 with a circular segment-shaped cross-section is. In the recess 96, a drop-shaped damper element 97 is formed of solidified potting compound.

The FIGS. 17 and 18 show a contact unit 98 with a contact piece 99, wherein in a contact side 100 of the contact piece 99, a slot-shaped recess 101 is formed with a molded therein damper element 102. The recess 101 may be formed, for example, with an end mill, wherein the contact piece 99, a peripheral wall 103, the recess 101 for receiving potting bounded. The damper element 102 can thus form a surface 104 which projects beyond the contact side 100.

The FIGS. 19 and 20 show a contact unit 105 with a contact piece 106, damper elements 107 and 108 in recesses 109 and 110 and an applied to the recesses 109 and 110 support member 111. The recesses 109 and 110 were filled with a quantity of potting compound, each one contact side 112 of the contact piece 106 towering over. The support element 101 has been positioned on the potting compound that has not yet completely solidified, such that a damping gap 113 remains between the contact side 112 of the contact piece 106 and the support element 111 upon solidification of the potting compound. The support element 111 further has a through hole 114 through which a connection conductor 115 is guided.

The Fig. 21 shows a contact unit 116 in which in a contact piece 117 holes 118, 119 and 120 for receiving a sensor element 121, a strand end 122 and an interruption device 123 are formed. Surrounding a connection conductor 124, a recess 125 for receiving a damper element 126 is formed.

A contact unit 127 with a contact piece 128 is in Fig. 22 shown. In bores 129 and 130, a respective stranded end 131 and 132 and in a bore 133 a breaker 134 is received. Above the bore 133 is a recess 135th formed to receive a damper element 136. The damper element 136 closes the bore 133 in such a way that the interruption device 134 is securely fastened in the bore 133 and the use of recoil powder can be dispensed with.

Fig. 23 shows a contact unit 137 in which in a contact piece 138 holes 139, 140 and 141 are formed, and in each of which a sensor element 142, an interruption device 143 and a stranded end 144 is arranged. Above the holes 139, 140 and 141, a circular segment-shaped recess 145 is formed, wherein in the recess 145, a damper element 146 is arranged, which surrounds a sensor conductor 147 of the sensor element 142 and a connecting conductor 148 and closes the bore 140 of the interrupting device 143 covering.

Claims (23)

1. A method for producing a contact unit (44, 52, 63, 70, 80, 87, 93, 98, 105, 116, 127, 137), in particular a brush unit, comprising at least one contact piece (51, 53, 64, 71, 81, 88, 94, 99, 106, 117, 128, 138), at least one connecting conductor (45, 57, 67, 73, 115, 124, 148) and at least one damper element (50, 60, 61, 68, 78, 79, 85, 86, 89, 97, 102, 107, 108, 126, 136, 146) comprising rubbery-elastic features, said damper element being realized in such a manner that a compressive force can be applied onto the damper element in the direction of a contact side of the contact piece, said damper element serving for damping vibrations of the contact piece,
   characterized in that
   for forming the damper element, a recess (72, 83, 84, 96, 101, 109, 110, 125, 135, 145) is formed in a surface of the contact piece and, subsequently, the recess is filled at least partially with an elastically solidifiable casting compound.
2. The method according to claim 1,
   characterized by
   the method steps:

   - forming at least two recesses (72, 83, 84, 96, 101, 109, 110, 125 135, 145) in the contact piece (51, 53, 64, 71, 81, 88, 94, 99 106, 117, 128, 138),

   - arranging the connecting conductor (45, 57, 67, 73, 115, 124, 148) in a first recess,

   - filling the first recess with a filling material (47),

   - applying a cover compound (48) on the filling material,

   - introducing a casting compound into a second recess and forming the damper element (50, 60, 61, 68, 78, 79, 85, 86, 89, 97, 102, 107, 108, 126, 136, 146) via the casting compound becoming solidified.
3. The method according to claim 2,
   characterized in that
   the recesses (72, 83, 84, 96, 101, 109, 110, 125, 135, 145) are formed in a single work step.
4. The method according to any one of the preceding claims, characterized in that
   at least one further recess (72, 83, 84, 96, 101, 109, 110, 125, 135, 145) is formed in the contact piece (51, 53, 64, 71, 81, 88, 94, 99, 106, 117, 128, 138).
5. The method according to claim 4,
   characterized in that
   an interrupter device (58, 123, 134, 143) is inserted into a recess before introducing the casting compound.
6. The method according to claim 4 or 5,
   characterized in that
   a casting compound is introduced into two recesses (83, 84, 109, 110).
7. The method according to any one of the claims 1 to 6,
   characterized in that
   a further recess is formed, in which a sensor element (121, 142) is arranged.
8. The method according to any one of the claims 1 to 6,
   characterized in that
   a further recess is formed, in which a further connecting conductor is arranged.
9. The method according to any one of the preceding claims,
   characterized in that
   at least one recess is formed as a bore hole (46, 49, 54, 55, 56, 65, 66, 74, 82, 118, 119, 120, 129, 130, 133, 139, 140, 141).
10. The method according to any one of the claims 2 to 9,
    characterized in that
    one recess (72) is formed at least partially as a circular ring.
11. The method according to any one of the claims 2 to 9,
    characterized in that
    at least one recess is formed as an oblong hole (92).
12. The method according to claim 11,
    characterized in that
    the recess (83, 84, 96, 145) is formed having a cross-section in the shape of a circle segment.
13. The method according to any one of the preceding claims,
    characterized in that
    a cover compound (48) and the casting compound are applied in a single work step.
14. The method according to any one of the preceding claims,
    characterized in that
    an amount of casting compound is introduced into the recess (96, 101, 109, 110) in such a manner that the casting compound projects over one abutting side (62, 69, 95, 100, 112) of the contact piece (53, 64, 94, 99, 106).
15. The method according to claim 13,
    characterized in that
    the casting compound is provided with a capping element (111) before becoming solidified.
16. The method according to claim 13,
    characterized in that
    a casting compound is used as a covering compound (48).
17. The method according to any of the preceding claims,
    characterized in that
    silicone is used as a casting compound.
18. A contact unit (44, 52, 63, 70, 80, 87, 93, 98, 105, 116, 127, 137),in particular a brush unit, produced using a method according to any one of the claims 1 to 17, comprising at least one contact piece (51, 53, 64, 71, 81, 88, 94, 99, 106, 117, 128, 138), at least one connecting conductor (45, 57, 67, 73, 115, 124, 148) and at least one damper element (50, 60, 61, 68, 78, 79, 85, 86, 89, 97, 102, 107, 108, 126, 136, 146) having rubbery-elastic features, wherein for forming the damper element, a recess (72, 83, 84, 96, 101, 109, 110, 125, 135, 145) is formed in a surface of the contact piece and the recess is filled at least partially with an elastically solidified casting compound
    wherein the damper element is realized in such a manner that a compressive force can be applied onto the damper element in the direction of a contact side of the contact piece, said damper element serving for damping vibrations of the contact piece.
19. The contact unit according to claim 18,
    characterized in that
    at least two recesses (72, 83, 84, 96, 101, 109, 110, 125, 135, 145) are formed in the contact piece (51, 53, 64, 71, 81, 88, 94, 99, 106, 117, 128, 138), the connecting conductor (45, 57, 67, 73, 115, 124, 148) is arranged in a first recess, the first recess is filled with filling material (47), a cover compound (48) is applied on the filling material, and wherein a solidified casting compound, which is introduced into a second recess, forms the damper element (50, 60, 61, 68, 78, 79, 85, 86, 89, 97, 102, 107, 108, 126, 136, 146).
20. The contact unit according to claim 19,
    characterized in that
    the first and the second recess (72, 83, 84, 96, 101, 109, 110, 125, 135, 145) are arranged on a shared middle axis.
21. The contact unit according to claim 20,
    characterized in that
    the first and the second recess (72, 125, 135, 145) are arranged concentric.
22. The contact unit according to claim 19,
    characterized in that
    the first recess is arranged on a side surface and the second recess is arranged on an abutting surface of the contact piece.
23. The contact unit according to any of the claims 18 to 22,
    characterized in that
    the contact unit comprises a plurality of contact pieces (51, 53, 64, 71, 81, 88, 94, 99, 106, 117, 128, 138).

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