EP2906841A1

EP2906841A1 - Bearing lubricated with a medium

Info

Publication number: EP2906841A1
Application number: EP13779118.2A
Authority: EP
Inventors: Nico Kirchhoff; Christian SCHULTE-NÖLLE; Thomas Loesche; Rupert Stitzinger; Irina SUSKE
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2012-10-12
Filing date: 2013-09-17
Publication date: 2015-08-19
Also published as: DE102012218619A1; CA2881916A1; US20150252840A1; CN104718386A; KR20150068987A; WO2014056496A1; CN104718386B

Abstract

The invention relates to a bearing lubricated with a medium, particularly a roller bearing or sliding bearing, comprising two bearing rings (1, 2) and a bearing path (3, 4) arranged on each of said bearing rings (1, 2), and a sacrificial anode (6) that is associated with at least one of the two bearing rings (1). The problem addressed by the invention is that of providing a bearing lubricated with a medium and comprising a sacrificial anode, the operational behaviour of said bearing being only slightly influenced by said sacrificial anode. According to the invention, this problem is solved in that the sacrificial anode (6) is arranged outside of the bearing interior (7) which is formed between said bearing rings (1, 2); and in that the sacrificial anode (6) is connected to the bearing interior (7) in an electrically-conductive manner.

Description

Designation of the Erflndun ed iengesei "in the camp

S

The invention relates to a medlen geslaglertes bearing according to the preamble of claim 1. 0 From the P axis so-called mediengesehmlerie bearings are known di n the bearing bypassing liquid UmgehMngsmedlym dnrehsetzt and in particular also be lubricated. The environment may in particular be an electrolyte, especially water, in particular salt water, which due to its oil ions does not cause corrosion of the material of the bearing rings of the bearing assemblies, but provides corrosion resistant materials which are extremely costly to their application for the bearing length become. In particular WSfelagerstahl in salt water is subject to corrosion, especially a Loehfrai korro lon, in the course of which in particular the bearing tracks of the rolling bearing, nimllch the / raceways of Wikkörper the rolling bearing, 0 are damaged after a short time, if no suitable? AEnabmen against the ^■ corrosion are taken.

From practice, it is fundamentally known to electrically connect a component subject to corrosion with a sacrificial anode made of an electrochemically less noble metal than5 so as to electrically conduct the component to be protected so that the material of the sacrificial anode is corroded and dissolved instead of the material of the component,

WO 2ÖÖ9 / 135482 Ä2 describes as the last example Bebeiiel (Fig, 10) eiD as with water, especially salt water, medlengesohrnledes bearing trained camp with wel bearing rings and each one arranged on the respective bearing ring, designed as a tap for Wikkdf & er stocking warehouse path, which is delimited between the two bearing rings, and which is bounded by the outer surface of the inner bearing ring and the inner surface of the outer bearing. Each of the two bearing rings is associated with a respective one öpferanodf, where di each sacrificial anode is received as a ring-shaped component to the bearing space delimiting, successive antelfla.eben in a respective groove so that the respective sacrificial anode in more direct: hub of Sohuteenden Lagerbabn, namely, the respective tread of the il body, is arranged. In this case, it is disadvantageous that in the case of the congested ligament of the sacrificial anode, which, for example, can consist of ink, products such as zinc hydroxide are formed as so-called rust near the lips and particles can partly deposit on the taps. that the ovens which are consumed in the operation of the rolling bearing are expensive to replace. U is also favorable, that weaken the grooves in addition to the raceways the bearing ring as a whole,

It is the object of the invention to provide a media-like bearing with a 0p-feranode, whose Beiriebsverhalten is little in the public by the feeder anode.

X saromenfas ng of the invention

This object is achieved in accordance with the invention for the bearing mentioned at the outset in that the sacrificial anode is arranged outside the daytime space formed between the bearing rings, and that the heater anode is electrically conductive with the bearing interior .v and n,

The at least one heater anode is connected to the bearing associated with this actuator anode, which is to be protected by this sacrificial anode. For example, the tel The bearing is located in the positional finneren, that is, in the area of the eiden Lagerfingen know. The electrically conductive connection to the inside of the bearing ensures that the bearing interior geschü with the bearing cock, the Sehn lermedlum acts as a sktotyt.

Products resulting from the corrosive reaction of the material of the sacrificial anode, such as zinc hydroxide, develop outside the bearing, away from the critical position of the foreign bodies. Further, it allows the at least one sacrificial node to form a grey-eyed and provided with a volume of an axis that is significantly larger than the ultimately limited space in the bearing interior, so that the propulsion unit can perform its function for a longer period of time.

Further, by arranging the sacrificial anode: outside the camp, the substitute deputy code in the case of a caliber is simplified.

It is preferably provided that the sacrificial anode is arranged on an end face of one of the two tagerrsoge. In particular, the at least one sacrificial anode is arranged on a slightly inclined end face of the standing one of the two days.

Alternatively or in addition to this, the sacrificial anode or a further anode can be arranged at a distance from the bearing and arranged separately from the bearing rings at a conversion constriction, in particular in a container specially provided for receiving the sacrificial dander.

Preferably, it is provided that the end faces and the jacket faces of at least one of the two bearing rings, in particular of both bearing rings facing away from the daily sheath, have an electrical insulation. The electrical insulation ensures that the hullerode is not subject to the associated storage, but not to the mQ emeMa Laeerumge a protection of the iso ization can be _: ceramic material, a polymer such as teflon or PEEK fPolyetbeetherkefon}, a polymer varnish, a polymer-based composite (z, B, a fiber-reinforced plastic, in particular a cured composite of a fiber-reinforced bte the insulation may be designed as a separate construction which is fastened to the end faces i, the bearing surface of the bearing assigned to the sacrificial anode, or as a view of the fleece of the bearing It will be understood that also the bore d bearing receptacle in which the bearing is fixed, or the surface of the shaft on which the bearing ring is arranged _{* has} an electrical insulation

Preferably, it is provided that the connection of the outer mode to the outer layer of the conductor leads to an insulated conductor cable

With regard to the conductor cable, it is preferably provided that the gate is connected to the electrical conductor of the conductor cable by an electrically conductive adhesive, an electrically conductive adhesive or a press connection,

Preferably, it is provided that the inner cable terminates in the bearing interior in a ring electrode which runs essentially parallel to a bearing track of one of the bearing rings. The ring electrode ensures that the critical region of the bearing cock is kept at the same electro-ohmic potential along its initial action and in particular a LoehfraSrosion can find no starting point.

Preferably, it is provided that: the sacrificial anode is electrically conductively connected only to one of the two bearing rings, and that an electrical Kentai- flask, in particular a sliding contact, between the associated with the sacrificial anode bearing and the other bearing ring is formed, Oe sliding contact be formed in particular by eraphlf brushes. Further advantages and features: The invention results from the dependent claims as well as from the description of this invention.

The invention will be more closely described below with reference to the accompanying drawings. B B sc sc sc sc Figuren Figuren Figuren Figuren Figuren Figuren Figuren Figuren Figuren Figuren Figuren

i o

1 shows a schematic view of a partially sectioned view of an exemplary embodiment of a media-reduced bearing according to the invention. 5

Detailed pes & rei u sg of the figures

FIG. 1 shows a bearing designed as a roller bearing, comprising a first tag 1 formed as an exterior and a second tag 2 formed as an inner ring, wherein a respective forest path is formed on each of the two bearing rings 1, 2 Lagerbabn 3, 4 is provided for Walikörper 5 of the bearing

The bearing is designed as a bearing-sized bearing, that is, it is penetrated by the liquid fluid, the surrounding medium lubricating the bearing tracks 3, 4; The surrounding medium is especially water, especially one due to the chloride ioner? Corrosive sal water, which attack the material of the bearing ring 1, 2, namely a rolling bearing steel, with töchiraSkorrosion and in particular in the vicinity of the Lagerfoahnen 3, 4 selectively dissolve0 can. The bearing further urnfasst a Onferanede 6, de associated with the first bearing ring 1, narnlich efektdseh conductively connected to the first Lagerrmg 1 wr & unsten% _t so that the material of the sacrificial anode -, ürn as zinc © the Zlnkaluminlitm instead ds vVitelagerstanls the first bearing ring 1 korresions edingt is resolved.

Pöf the Öpteranode .8 is provided, the sacrificial anode 8 is arranged outside of the formed between the bearing rings 1, 2, kreisringfdrmigen bearing inner 7, and that the ö feranode 8 with the inner layer 7 is electrically conductively ver

The trained Öpferanobe 8 is outside of the camp, spaced from the two bearing rings 1, 2 of the bearing, arranged on a portion of a housing, for example, in a vorgese in Gehiuse Äufnahmeyt or provided for receiving the sacrificial anode, the housing attached component accommodated, oil immersion anode 8 is in the illustrated Äusfuhryngsbelsplel opposite the bearing ring 1 by an electrical insulation 11 spaced :, the Isoli rang 11 durc an electrical conductor diimhsetei is in particular seen that the end faces $, 0 and the bearing interior of the 7th turned away, outer surface 10 of the first layer dnge 1 elute the electrical Isolierun 11 with respect to the housing and thus gegenübe of the: Gehiuse recorded öpteranode 6 wherein the outer surface 10 of the first bearing ring 1 is fixed to the housing in a e bore , The electrical insulation 11 is formed as a Beschchtung of the end faces 8, 9 and the sweeter, from the layers nneren 7 away facing lateral surface of the first bearing ring 1, wherein the eset lehtung is formed of a ceramic or a plastic Is and is selected such that the material of the attention: in the ymgeoyngsmedi ni of the camp only a small amount of oil behavior For the second bearing 2 is also provided that the end faces 12, 13 and 7 facing away from the La ehu neren, inner Manteif pool 1 has an electrical insulation 18 Thus, the second bearing ring 2 is electrically ge ge esoer not shown shaft formed where egg of the rolling body 5 made of an electrically conductive metal or ceramic hardly exist

So that the Qpferanode 6 with the geri ^ i? electrically conductive: connected st, is provided that the electrically conductive connection of the sacrificial anode 6 with the bearing interior 7 comprises an insulated conductor cable 18 The isolated LeL terkabel S includes a copper conductor and a copper conductor surrounding plastic insulation. The telterkabei 18 passes through the insulation 11 of the first bearing ring 1 at its first end face 8 and establishes an electrically conductive Kentakt between the sacrificial anode 8 and the first bearing ring 1 ago. A first end of the conductor cable 16 is electrically connected to the booster anode 8, that the electrically conductive material of the sacrificial anode 8 with the electrical copper conductor of the conductor cable 18 by an electrically lestfablgen adhesive, a Pressverbind ng or an electrically leitfählge Lö electrically conductively connected. The second end de Leiterkabeis 16 is added tion in a recess provided in the metallic body of the first bearing ring 1 Sacklochboh- _* wherein the copper conductor contacts the base of the Sackloehhohrung electrically conductive, so that at least in sections, in particular adjacent to the position of web 3, unbesehlehtete interior lateral surface 17 of the first bearing ring 1 ^' , which limits the bearing interior 7 to one side and which has no Beschchbung, elekfroehet is protected by the iron anode 8 iisch. Di blind hole is m the rest filled with a material that ensures that m the contact parts of the second end of the Lelterkabeis with the material of the first layer around 1 no rusting occurs; At the inner lateral surface 17 of the first bearing ring 1, the corrosive salt water comes into direct contact with the corrosion-resistant Wäfetagerstahl of the first bearing ring _s, however, no significant corrosion occurs on the inner circumferential surface 17 due to the electrically conductive compound mt de the sacrificial anode 6, In the illustrated embodiment, it is provided that the sacrificial album 6 is only electrically conductively connected to the first bearing ring 1 in the first place, and that an elective contactor. 18, narnlich airv sliding contact in particular brush contact: made of graphite, between which is formed directly with the Öpferanode first Varfeundenen first bearing ring 1 and the second Lagerrlßg 2, the ontaktierung 18 is included within a Diehlmass 19, which acts as Verfllter and penetration 0h verse uhr The Kentakileryng 18 connects the metallic surface of the inner hexagonal flat 17 of the first bearing ring with the likewise metallic surface of the outer lateral surface 20 of the running bearing ring 2 _f where the two flank surface 7, 20 the Lagerir nere m limit both sides and in the illustrated radial bearing define a: annular circumferential bearing gap.

It sieves: sieve, that at least one of the two bearing inner 7 limiting antelflaobe 7, 20 de iagerrlnge 1, 2 in particular in a Absland to the Lägerbah 3, 4 may have a passive, corrosion-bememende Beschiphtung.

It is further understood that the second end of the cable conductor 18 can not terminate at the bottom of a blind bore of the first bearing race 1 but can terminate in an electrode, with the ring electrode extending parallel to the raceways 34

It goes on to say that more than one single former 16 can be provided which connects the sacrificial anode 6 to the first bearing ring 1. It is possible that both bearing rings 1, 2 are connected to a common sacrificial anode 8, each having at least one electrical conductor: the common heater anode S st arranged, for example, on the end face on the stationary bearing ring and, for example, above a sliding contact with the rotating slip ring electrically connected. In the case of the above-described embodiment, the sacrificial anode 6 was arranged spatially separated from the bearing. itself that the Ö fen- anede 6 on an end face 8 ds first Lagerrinfs 1 _i: electrically insulated from this durc the insulation 1 1 in the region of de Stirniact 8 and electrically conductive by a short e ektrischen conductor with the capable body konit first bearing ring 1 connected ,, can be arranged. The electrical conductor man thereby be formed by a short * Keililelter or by a plug connection,

In the Ausführungsheispie described above! was the camp as a Watelager, namely as a single row angular contact ball formed, whose bearing tracks ^{' were} 3, 4 careers for the Waatkörper 5, It is understood that there bearing can also be designed as a sliding bearing, the bearing cocks are sliding surfaces in such a Close contact, that a sacrificial anode between the Gleitfläehen can hardly be arranged, so that the proposed arrangement of the booster anode outside of the limited by the shelves bearing inside of the sliding bearing allows permanently protect a mediengesehiferous sliding bearing against corrosion au.

In a case in which an al wafebahn or bearing surface formed as a bearing surface directly into the surface of a well or a Fliehe a bore of a bearing housing is incorporated, Is provided with the bearing race shaft or there in the area of bearing bchryng with the tagerbahn hene Housing al 'bearing ring' within the meaning of the invention described above to be considered. Bezög & zelcr it

1 first day ring

2 second bearing ring

3 tagerba hn of the first) bearing ring 1

4 bearing track of the second bearing ring 2

5 Äizkorper

6 sacrificial anode

7 bearing inside

0 End face of the first day 1

9 end face of the first Lagemngs first

1 δ, the first day of the day on which the first day began was 1, so that the electrical energy was absorbed

12 end face of the second bearing ring 2

13 end face of the second bearing ring. 2

14 inside with a wide area of eiflache 2

15 electrical insulation

18 conductor cables

1? Inner surface of the first Lagerhngs 1

18 ontakfier ng

10 sealant

20 outer lateral surface of the second bearing ring. 2

Claims

isprüctie

Msdiengescrirnieries bearing, in particular rolling bearings or plain bearings, comprising

■ $ m \ bearing ring (1, 2) and depending on a respective bearing ring (1, 2) arranged bearing track 4), and

a propeller anode (6). is assigned to at least one of the two storage margins (1).

thereby nei gekernten

that the booster anode) is arranged outside the w sc e the bearing rings (1, 2) formed bearing inside (?), And

that the booster anode (8) is connected to the bearing interior (7) in an electrically conductive manner.

Medial-controlled bearing according to claim 1, dufcf g ks it «©! © !? m that the Öpferanode rings is arranged on an end face of one of the two bearings. iediengeschmiedes bearing of claim 1 barren 2 _S dasi deer gekersn "eie Raei that the end faces (8, 9, 12, 13}, and that of the Lagerin- Her n (?) facing away antefflaehe (1d, 14} at least one of Pelden bearing rings ( 1, 2), in particular of both bearing rings (1, 2), having an electrical insulation (15) .The device according to claim 1 to 3 _, wherein the electrically conductive connection of the heater anode (β) with insulated inside the bearing (?): conductor cable (16)

5. yediengeschrriiedes bearing according to claim, dadyre gek ^loh- i @ t that the пferanode ßen) with the electrical conductor of the conductor cable (16) du b an electrically Leltfa gene adhesive, an electrically Leltfä- hiqe Lötschioht or a Pressverbindunq is connected. Mediengesehmiertes bearing according to claim 4 or 5, d isreh g $ K rm ~ se sftftft that the ends lester cable in the daily potting n a Rfngeleld- rode, the tu in weeenfficben parabl ^'a Lagerbabn a dr Lagernnge runs. Pressed bearing according to any one of claims 1 to 6 _; dadureh geke "n" e! ch: el, as the sacrificial anode (6) is verbunelen only with a eid gergerhnge (1) electrically conductive, and that an electrical contact {18), in particular a sliding contact, see that with the 0 f «fü tü <te ^' . (E). Bearing ring (2) is formed. yi ngeschmlartee bearing according ee claims 1 to 7, dadsar is kersrizeiÄ ei that the öpferaoode (8) in particular against a Stimfiiche (8) of the bearing ring (i) by a leofieryng (11) beahstandet: is arranged. and that the insulation (11) is interspersed by an electronic conductor. the sacrificial node (6) u electrically connects the bearing {1}.