DE1926203A1 - Electric contact brush - Google Patents

Description

DR. MÖLLER-BORS DIPL.-ING. GRALFS DR. MANITZ _Ώήύ

PATENT LAWYERS

Braunschweig, the d-Λ . May 1969 Our reference: ij 84-9 - Li / Liβ

'E CiLiBON LIIiIl ¹ Ji) D tSattersea Church Hoad,
London SV /. 11, Engl and

Priority: Great Britain from May 3rd No .: 24637/68

Electric contact brush

Me invention relates to an electrical contact brush with a electrically conductive brush body and a flexible one electrical line,

In a known brush of the type mentioned, aie becomes flexible electric wire attached to the brush body in that it is inserted into a bore provided in the brush body and then in this hole, for example with solder, pressed metal, a rivet or by pressing in the brush around the pipe. While these methods create perfect connections, they are not universal

909848/0875

BRAUNSCHWEIG, AM BOfKKIWAJ * 8 * «0631) 2 H 87 8 MÖNCHEN 22. HOBERr-KOCH-STB. I * (MII) 225 110

Applicable, so for a certain 3 "type or construction a certain fastening method must be used -3 jjonrung manufacture, ^ uuerde .- 'i Laben dii different procedures each oesti ^ mte uachreile. I> ie /yr.venaunf^ von Zusai.-menyepreJüeii irulvern in a jonruii- ^ ci: -η t; -:, - irie ausreioLenae! '"' estig ^ eic der Verbiudunf? jj chaff en, v / siax iie leiban- "· intermittent. vibrations and oüüß unaorv / orfen int. Jas soldering aer i.-oiban '; en isa problematic .ve ^ oi eier' _Giir - :. uiipfunfi; des: .. aterials Bein .ibrcählon aes Lutmitfcels. By dac jindruc the density of the x '/ irsrenmateriaxs is in aeu y-reicu, in which the pressing takes place, and then there is a waste of expensive copper Una break out the icarm bristle material in the overburden area.

The invention is based gave up a _ele: to provide contact brush briscne that a connection between your brush body and the flexible electrical _{j_-;} itun ?? that is free of the above-mentioned rushes and works flawlessly in a wide variety of brush constructions in all cases of use.

According to the invention, this object is achieved in that a Metal layer is provided, which is sintered together with the brush body, that the flexible electrical line on the metal layer attached and electrically conductively connected to this and that the Uetallschicht a greater strength than the brush body has.

909848/0875

Dei? Brush body Can be made from any of the for adjustment

to brush
eJektri.--oi.er xvonta.ct; / bexarmuen materials exist. The i.iutex * iai ^ therefore a wide range of materials can be selected from {that of pure carbon (graphitiscli o.ier not graphitiscli) over a ωίvision of carbon with various metals and alloys (for example iOipfer oaer iuipfer with; one or more additives, such as dJei, ΐ ', ΐΐΗχ, iansan or silver), carbon or carbon fi., et; -ai.i.-j.ieui: un .en, die, ;; erin ^ e Amounts of other additives, such as nicixi; -xei eiiae grinding and lubricating agents, for example ίνίοΐΛücLändisulfid and polytetrafluoroethylene, de-cold, up to lietullen, which only _; .-erin.; e! " narrow of carbon and / or other ^ d.-itive entnaJ ben, ranges ;.

The advantage of the invention is that it overcomes the problems that occurred with the brush icon constructions, in which the connection between the brush body and the other. aer flexibleu j_eituii]; and in particular in which the verbiriduxv-- unjustifiable by ·;,. "3c &: aaen ^ e-x'eicii a material surface occurred, while the .erfinduil · - .; can be used for brushes that are possible on the axle, it is suitable , uG-son era far most such Büx ^v, occurred in M.exien Bisner äufi operational problem that the connection of the r> ärstenlcörjoers ifiio dtx · flexible x.,. ijaxig fallow

So the; ux uen Bürabenkb'rper sintered-iet is all really chosen so that. si '; fixed int al. ^c ) the outer body (dex ¹ itself a pjrojsen jjafceJl to j.'etall eiiuhalten kaixn), where dex ¹ touchuni'jsbej-eich a.'isjujieu of the metal layer and the brush body should be larger than the contact area the flexible

BATH ORIGINAL

48/0875

len conduction and the metallic layer, whereby there are any strong impacts or tensile loads that act on the flexible electrical cable reduce the load effectively distributed over the relatively large area of the brush body.

Covered in a preferred embodiment of the invention, the metal layer W effectively the working surface (electrical contacting surface) opposite face of the brush body.

jjie invention is illustrated in the drawing, for example. light and in the following in detail with reference to the drawing show:

Fig. 1 is a side view of an embodiment of an electrical Contact brush,

Fig. 2 is a section through another embodiment of a Contact brush and

3 to 7 different production stages of an electrical Contact brush.

According to the drawing, an electrical contact brush comprises one Body 1, which is connected to a metallic layer 2. At the A flexible electrical lead 3 is attached to a metal layer.

909848 / 08.75 bad or, g _IN al

The brush body 1 consists primarily of a metal and graphite, it being possible to use, for example, copper with alloy components known per se as the metal. The metal layer 2 can consist of copper or iron, for example, or a mixture of both, but the invention is not limited to the use of such metals. The flexible supply line 3 can consist of thin electrically conductive metal wires made of, for example, copper. The wires can of course also be formed from any other suitable metal _{or the like}

The one in i'ig. 1 is illustrated embodiment the electrical lead 3 on the surface of the uetallschicht 2 attached by welding. The welded joint is with the Item number -l · denotes. The welded joint is thereby preferably made with the help of a resistance pressure weld «

The one in ϊΐ? Σ. 2 illustrated embodiment, the flexible supply lead to the Bidding all layer 2 is connected by dadi a hole is first in the metal layer 2 is provided, in which then a Ji'nde the flexible lead is attached, in ^ which is pulped it with, for example, copper particles 6 . ■ - -

Efacn an embodiment not shown in the drawing can the flexible supply line 5 after it is in the hole is inserted, to be soldered to the metal layer 2.

909848 / 087S

The brush body 1 is primarily made of a metal and graphite, it being possible to use copper with alloy components known per se as the metal. Copper or any other suitable metal can make up up to 95% of the total burst population. A large number of metals can be used for the brush body, such as compositions of metallic and graphite in the mixing ratios of 2 ^ / Lupfer and y5 / »graphite up to 9? / ^J copper and % o graphite, and the exterior fittings are spöning Contain lead, tin, cinnamon or a combination of these up to about % ο of the total composition, so that the burst composition can consist of 95, ^ i metal and 5 / ^ graphite in the worst case. The bristle material, however, is not of prime importance in the context of the invention. is to attach a flexible iCupi'erleiter to a brush, the main component of which is metal.

The brush is set up in such a way that the surface area with which the metal layer 2 and the three-dimensional body 1 touch is larger than that between the flexible supply line 3 and the metal layer 2 . in this disorder, the flexible supply line 3 is exposed to any tensile load, the stress per unit area on the brush body is comparatively reduced and in any case less than if the supply line were attached directly to the brush body.

Preferably, the metal layer 2 is formed by, and attached to the brush body 1, as that used to produce the

BATH 909848/0875

Layer serving material pressed together with the brush material and is sintered together.

The pressing and sintering process is shown schematically in FIGS illustrated. 3 shows a compaction press with a die 7 »which has two pistons 8 and 9 that work against one another. First, as shown in Fig. 4- shown, filled with metal powder for the production of the brush body 1. Then the piston 8 "on the bottom reduced by a certain amount. Then in the die 7 on top of that for the production of the brush body 1 serving powder, the powder serving to manufacture the metal layer 2 is filled, as shown in FIG. then the upper piston 9 is pushed down to compress and compact the powder layers. The condensed Components are finally sintered for a certain period of time at a suitable temperature.

In a particular embodiment of the invention, the following metal powders are mixed together in a small amount of lubricants. , for example stearic acid (zinc stearates can also be used as a lubricant for the Die can be used):

78 parts by weight of copper powder with a grain size that has a sieve mesh size of 150/1 (100 mesh Brit. Standard 410: 1962),

10 parts by weight of lead powder with a grain size corresponding to a sieve mesh size of 75 μm (200 mesh Brit. Standard 410: 1962),

909848/0875

6 parts by weight of manganese powder with a grain size corresponding to a sieve mesh size of 150 μ and

6 parts by weight of natural graphite with a grain size corresponding to a sieve mesh size of 75 / U.

The mixture of the powders is poured into the die or mold 7 of the compaction press, and then a measured amount of reduced sponge iron powder with a grain size corresponding to a sieve mesh size of 150 μ is placed on top of this powder to form a layer 5 mm high to build. The powders are then applied with a pressure of approx.

ρ
1575 kgf / cm (10 tons per square inch) compressed and

^{sintered together at 840 °} C. for one hour in a suitable protective gas atmosphere.

It should be mentioned that the powder used to manufacture the brush body 1 can be compressed before the Formation of the metal layer 2 provided powder is filled. However, one does not become so by the successive pressing good connection between the brush body 1 and the metal layer 2 is formed, as with the former method is achieved. Accordingly, the former method is preferred.

The pressing and sintering process creates an excellent mechanical and electrical bond between the brush body and the metal layer. The connection between the flexible electrical lead and the metal layer is, regardless of whether

909848/0875

them through. Welding, ramming or soldering is carried out, mechanically strong, as the connection between two metals is established. Because the surface area at the interface between the metal layer and the brush body is greater than that between the flexible lead and the metal layer any tensile load acting on the flexible lead is evenly distributed to the brush at the interface.

909848/0875

Claims (4)

Expectations 1./Elektrische contact brush with an electrically conductive ■ - 'the brush body and a flexible conduit, characterized in that a metal layer (2) is provided, which is sintered together with the brush body (1), that the flexible conduit (3) to the metal layer (2) is attached and electrically conductively connected to this and that the metal layer (2) has a greater strength than the brush body (1). 2. Electrical contact brush according to claim 1, characterized in that that the area of contact between the metal layer (2) and the brush body (1) is greater than that between the metal layer (2) and the flexible line 3. Electrical contact brush according to claim 1 or 2, characterized in that the metal layer (2) made of copper, iron or consists of both metals. 4. Electrical contact brush according to one of claims 1 to 3 » characterized in that the flexible line (3) is attached to the metal layer (2) with the aid of a resistance pressure weld connection is attached. 909848/0875