SE447010B - Method and device for roll bearing lubrication monitoring - Google Patents

Method and device for roll bearing lubrication monitoring

Info

Publication number
SE447010B
SE447010B SE8402451A SE8402451A SE447010B SE 447010 B SE447010 B SE 447010B SE 8402451 A SE8402451 A SE 8402451A SE 8402451 A SE8402451 A SE 8402451A SE 447010 B SE447010 B SE 447010B
Authority
SE
Sweden
Prior art keywords
bearing
roller
roller bodies
electrically conductive
electrically
Prior art date
Application number
SE8402451A
Other languages
Swedish (sv)
Other versions
SE8402451D0 (en
SE8402451L (en
Inventor
P E L Walderyd
J A T Loodberg
Original Assignee
Scaniainventor Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scaniainventor Ab filed Critical Scaniainventor Ab
Priority to SE8402451A priority Critical patent/SE447010B/en
Publication of SE8402451D0 publication Critical patent/SE8402451D0/en
Priority to PCT/SE1985/000440 priority patent/WO1987003053A1/en
Publication of SE8402451L publication Critical patent/SE8402451L/en
Publication of SE447010B publication Critical patent/SE447010B/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F16C2202/32—Conductivity

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A method and device for lubrication monitoring in roll bearings, which have rolling bodies (1) and bearing races on two mutually mobile parts (2, 3) through the rolling body, uses an electric measuring signal which is transferred via lubrication film to a bearing bracket (4) or other concomitant body (1) in the bearing with electrical conducive parts near the rolling bodies. The area of these is greater than the area between the rolling bodies and the bearing race. Changes in the condition of the lubrication film between the rolling bodies and the bearing race is monitored through a detector for determination of the change's impact on the measuring signal. The bearing bracket (4) has two or more connected pieces (5, 6), each electrically conducive, which have leading parts delimiting space intended for the rolling bodies and are held together by electrically insulated parts (7, 8).<IMAGE>

Description

15 20 25 30 35 447 010 2 Det i fig 1 partiellt visade rullningslagret har rullkroppar 1, t ex kullagerkulor, som rullar på lagerbanor på en yttre lagerring 2 samt en inre lagerring 3, vilka således bildar genom rullkropparna l inbördes rörliga delar. För styrning av rullkropparna l är på konventionellt sätt en ringformad rullkropps- bållare 4 anordnad, vilken har urtag för rullkropparna l. Rullkroppshållarens 4 till rullkropparna l angrän- sande partier är utformade elektriskt ledande och med en väsentligt större area än kontaktarean mellan rullkïopparna l och lagerbanorna på ytterringen 2 och innerringen 3. De elektriskt ledande, till rull- kropparna via en smörjfilm angränsande partierna kan alternativt vara utformade på en separat, från rull- kroppshållaren skild, men rullkropparna åtföljande kropp. The rolling bearing partially shown in Fig. 1 has roller bodies 1, for example ball bearing balls, which roll on bearing tracks on an outer bearing ring 2 and an inner bearing ring 3, which thus form mutually movable parts through the roller bodies 1. For guiding the roller bodies 1, an annular roller body ballast 4 is arranged in a conventional manner, which has recesses for the roller bodies 1. The portions of the roller body holder 4 adjacent to the roller bodies 1 are designed to be electrically conductive and with a substantially larger area than the contact area between the roller tracks 1 and the bearing tracks 1. on the outer ring 2 and the inner ring 3. The electrically conductive portions adjoining the roller bodies via a lubricating film may alternatively be formed on a separate body, separate from the roller body holder, but accompanying the roller bodies.

Hela rullkroppshållaren 4 eller nämnda alternativa kropp kan bestå av ett elektriskt ledande material, t ex metall eller en elektriskt ledande plast, så att nämnda elektriskt ledande partier är elektriskt förbundna inbördes.The entire roller body holder 4 or said alternative body may consist of an electrically conductive material, for example metal or an electrically conductive plastic, so that said electrically conductive portions are electrically connected to each other.

Enligt ett föredraget utförande är emellertid de elektriskt ledande partierna inbördes elektriskt sammankopplade i två eller flera grupper, vilket kan åstadkommas genom att rullkroppshållaren 4 eller nämnda alternativa kropp består av två eller flera samman- hängande, var för sig elektriskt ledande delar, som är sammanhållna av elektriskt isolerande delar. De elektriskt ledande delarna kan härvid utgöras av metall eller en ledande plast, medan de elektriskt isolerande delarna kan bestå av en isolerande plast. Ett exempel på en sådan rullkroppshållare 4 är visat i fig 3, där rullkroppshållaren 4 består av två elektriskt ledande delar 5 och 6, vilka är skilda åt av två elektriskt isolerande delar 7 och 8. De ledande delarna 5 och 6 upptar huvudparten av rullkroppshållarens 4 omkrets och innehåller samtliga urtag för rullkropparna l.According to a preferred embodiment, however, the electrically conductive portions are electrically interconnected in two or more groups, which can be achieved by the roller body holder 4 or said alternative body consisting of two or more interconnected, separately electrically conductive parts, which are held together by electrically insulating parts. The electrically conductive parts can in this case be made of metal or a conductive plastic, while the electrically insulating parts can consist of an insulating plastic. An example of such a roller body holder 4 is shown in Fig. 3, where the roller body holder 4 consists of two electrically conductive parts 5 and 6, which are separated by two electrically insulating parts 7 and 8. The conductive parts 5 and 6 occupy the main part of the roller body holder 4 circumference and contains all the recesses for the roller bodies l.

L :. *' 'Sfffi rr n Pool: QUA m l- » -_ Ja., 10 15 20 25 30 35 __.__.__ -_.__..._. . 447 010 3 Enligt en utföringsform av uppfinningen kan de ledande delarna 5 och 6 vara elektriskt förbundna med varandra via en spole 9, vilken såsom visat i fig 2 kan vara lindad runt yttersidan av rullkropps- hàllaren 4 i utrymmet mellan rullkropparna l för in- duktiv koppling till exempelvis en utanförliggande spole 10 (se fig 4).L:. * '' Sff fi rr n Pool: QUA m l- »-_ Ja., 10 15 20 25 30 35 __.__.__ -_.__..._. . According to an embodiment of the invention, the conductive parts 5 and 6 can be electrically connected to each other via a coil 9, which as shown in Fig. 2 can be wound around the outside of the roller body holder 4 in the space between the roller bodies 1 for inductive connection to, for example, an external coil 10 (see Fig. 4).

Det i fig 4 visade elektriska kretsschemat avser en utföringsform av anordningen enligt föreliggande uppfinning som utnyttjar rullkroppshållaren enligt fig 2 och 3. Samma hänvisningsbeteckningar som i fig 1-3 utnyttjas i fig 4. Spolen 10 är inkopplad i en krets med en växelströmskälla ll och en detektor 12, medelst vilken tillståndet hos en smörjfilm i rull- ningslagret skall övervakas genom bestämning av elektris- ka parametrar hos en mätsignal, som alstras av generatorn ll och via spolen 10 överföres kontaktlöst på induk- tivt sätt till spolen 9, som är ansluten mellan de ledande delarna 5 och 6 hos rullkroppshâllaren 4.The electrical circuit diagram shown in Fig. 4 relates to an embodiment of the device according to the present invention which uses the roller body holder according to Figs. 2 and 3. The same reference numerals as in Figs. 1-3 are used in Fig. 4. The coil 10 is connected in a circuit with an AC source 11 and a detector 12, by means of which the state of a lubricating film in the rolling bearing is to be monitored by determining electrical parameters of a measuring signal which is generated by the generator 11 and is transmitted contactlessly via the coil 10 to the coil 9, which is connected between the conductive parts 5 and 6 of the roller body holder 4.

Kondensatorer Cl, C2, C3 och C4 i fig 4 representerar kapacitansen mellan rullkroppshàllardelen 5, 6 och de i denna inrymda rullkropparna l. Kondensatorer C12, C22, C32 och C42 representerar kapacitansen mellan rullkropparna 1 och den yttre lagerríngen 2, medan kondensatorer C13, C23, C33 Och C43 representerar kapacitansen mellan rullkropparna l och den inre lager- ringen 3. Genom att enligt föreliggande uppfinning de elektriskt ledande, till rullkropparna 1 via smörj- filmen angränsande partierna hos rullkroppshållaren 4 (alternativt den separata kroppen) har väsentligt större area än kontaktarean mellan rullkroppar l och lager- banor på ytterringen 2 och innerringen 3 har kondensa- torerna Cl, C2, C3 och C4 väsentligt större kapacitans än kondensatorerna C12-C43. Därmed kan en förändring i kapacitansen hos någon av kondensatorerna C12-C43, dvs en förändring i smörjfilmens tillstånd mellan någon rullkropp l och endera lagerbanan återverka mätbart på signalparametrarna i primärkretsen 10, .,,._ POOR QUAnTY i l0 15 20 25 35 447 D10 4 11 och 12 och därmed övervakas mcdclsl detuktorn 12.Capacitors C1, C2, C3 and C4 in Fig. 4 represent the capacitance between the roller body holder part 5, 6 and the roller bodies 1 housed therein. Capacitors C12, C22, C32 and C42 represent the capacitance between the roller bodies 1 and the outer bearing ring 2, while capacitors C13, C23 , C33 and C43 represent the capacitance between the roller bodies 1 and the inner bearing ring 3. According to the present invention, the electrically conductive portions of the roller body holder (alternatively the separate body) adjacent to the roller bodies 1 via the lubricating film have a substantially larger area than the contact area. between roller bodies 1 and bearing tracks on the outer ring 2 and the inner ring 3, the capacitors C1, C2, C3 and C4 have significantly greater capacitance than the capacitors C12-C43. Thus, a change in the capacitance of any of the capacitors C12-C43, i.e. a change in the state of the lubricating film between any roller body 1 and either bearing web, can have a measurable effect on the signal parameters in the primary circuit 10, ._ ._ POOR QUANTY i 10 15 20 25 35 447 D10 4 11 and 12 and thus the mcdclsl detector 12 is monitored.

Detekteringen och mätningen kan således sägas utföras på kedjor, som består av rullkroppshållare - rullkroppar ~ rullbanor - rullkroppar - rullkroppshållare.The detection and measurement can thus be said to be performed on chains, which consist of roller body holders - roller bodies ~ roller tracks - roller bodies - roller body holders.

U Som ett alternativ till den beskrivna induktiva, kontaktlösa överföringen av mätsignalen till rullkropps- hållaren 4 kan en kapacitiv överföring ske, såsom visat i utföringsformen enligt fig 5. I detta fall är de elektriskt ledande, till rullkropparna l an- gränsande partierna hos rullkroppshâllaren 4 (eller den särskilda, rullkropparna åtföljande kroppen) samt- liga elektriskt förbundna inbördes samt med det ena belägget l3 i en kopplingskondensator, vars andra belägg 14 kan bestå av en fast, elektriskt ledande ring, som är placerad axiellt vid sidan av rullkropps- hållaren 4. Rullkroppshållaren 4 kan således utgöra nämnda ena belägg 13. Kapacitansen hos denna kopplings- kondensator 13, 14 skall enligt uppfinningen vara stor i jämförelse med kapacitanserna mellan de till _rullkropparna angränsande, ledande partierna hos rull- kroppshållaren 4 och rullkropparna 1. I utförings- formen enligt fig 5 är mätsignalsgeneratorn ll och detektorn 12 kopplade i serie mellan kopplingskonden- satorbelägget 14 och exempelvis den yttre lagerringen 2.As an alternative to the described inductive, contactless transmission of the measuring signal to the roller body holder 4, a capacitive transmission can take place, as shown in the embodiment according to Fig. 5. In this case the electrically conductive portions of the roller body holder 4 adjacent to the roller bodies 1 are (or the particular body accompanying the carcasses) all electrically connected to each other and to one liner 13 in a coupling capacitor, the other liner 14 of which may consist of a fixed, electrically conductive ring located axially next to the carcass holder 4. According to the invention, the capacitance of this coupling capacitor 13, 14 can be large in comparison with the capacitances between the conductive portions of the roller body holder 4 and the roller bodies 1 adjacent to the roller bodies. In the embodiment according to Fig. 5, the measurement signal generator 11 and the detector 12 are connected in series between the coupling capacitor the groove 14 and for example the outer bearing ring 2.

En mängd modifieringar av de ovan beskrivna utfö- ringsformerna är möjliga inom uppfinningens ram. Således kan rullkroppshållaren 4 förses med fler spolar än endast en, varvid den lämpligen uppdelas i flera ledande delar än två. Det inses också att detektorn 12 kan mäta vilken som helst elektriskt parameter i sin krets som återspeglar en förändring hos någon av kondensatorerna c12-c34, avsen föränaring av smörjfnmstiustånaet mellan någon av rullkropparna 1 och endera rullbanan.A variety of modifications of the above-described embodiments are possible within the scope of the invention. Thus, the roller body holder 4 can be provided with more coils than only one, it being suitably divided into more conductive parts than two. It will also be appreciated that the detector 12 may measure any electrical parameter in its circuit which reflects a change in any of the capacitors c12-c34, as a result of changing the lubrication state between any of the roller bodies 1 and either roller track.

POOR QUALITY _POOR QUALITY _

Claims (9)

LH 10 15 20 25 30 447 Û1Û PATENTKRAVLH 10 15 20 25 30 447 Û1Û PATENTKRAV 1. l. Sätt för smörjfilmsövervakning i ett rullnings- lager, som har rullkroppar (1) och lagerbanor på två genom rullkropparna inbördes rörliga delar (2, 3), k ä n n e t e c k n a t därav, att en elektrisk mätsignal överföres till en rullkroppshàllare (4) eller annan rullkropparna (1) åtföljande kropp i lagret med elektriskt ledande, till rullkropparna via smörjfilm angränsande partier, vilkas area är väsentligt större än kontakt- arean mellan rullkropp och lagerbana, samt att föränd- ringar i smörjfilmens tillstànd mellan rullkroppar och lagerbanor övervakas genom bestämning av förändringar- nas återverkan pá mätsignalens elektriska parametrar.1. l. Method for lubrication film monitoring in a rolling bearing having roller bodies (1) and bearing tracks on two mutually movable parts (2, 3) passing through the roller bodies, characterized in that an electrical measuring signal is transmitted to a roller holder (4) or other roller bodies (1) accompanying the bearing in the bearing with electrically conductive portions adjacent to the roller bodies via lubricating film, the area of which is substantially larger than the contact area between roller body and bearing race, and that changes in the condition of the lubricating film between roller bodies and bearing races are monitored by determination of the effect of the changes on the electrical parameters of the measuring signal. 2. Sätt enligt patentkravet 1, k ä n n e t e c k - n a t därav, att mätsignalen överföras kontaktlöst genom kapacitiv eller induktiv koppling.2. A method according to claim 1, characterized in that the measurement signal is transmitted contactlessly by capacitive or inductive coupling. 3. Sätt enligt patentkravet 1 eller 2, k ä n n e - t e c k n a t därav, att samtliga de elektriskt ledande partierna är elektriskt förbundna inbördes.3. A method according to claim 1 or 2, characterized in that all the electrically conductive portions are electrically interconnected. 4. Sätt enligt patentkravet l eller 2, k ä n n e - t e c k n a t därav, att de elektriskt ledande partierna inbördes är elektriskt sammankopplade i två eller flera grupper och att den överförda mätsignalen pålägges mellan skilda grupper.4. A method according to claim 1 or 2, characterized in that the electrically conductive portions are electrically interconnected in two or more groups and that the transmitted measurement signal is applied between different groups. 5. Anordning för genomförande av sättet enligt något av patentkraven 1-4 för smörjfilmsövervakning i ett rullningslager, som har rullkroppar (l) och lagerbanor på två genom rullkropparna inbördes rörliga delar (2, 3), k ä n n e t e c k n a d hållare (4) eller annan rullkropparna i lagret med elektriskt ledande, till vilkas area är av en rullkropps- åtföljande kropp rullkropparna via smörjfilm angränsande partier, väsentligt större än kontaktarean mellan rullkropp och lagerbana, samt av en detektor (12) för bestämning av återverkan av en förändring i smörjfilmens tillstånd 10 15 20 I N ba 447 010 6 mellan rullkroppar och lagerbanor på de elektriska para- metrarna hos en till rullkroppshållaren eller nämnda andra kropp Överförd elektrisk mätsignal.Device for carrying out the method according to any one of claims 1-4 for lubrication film monitoring in a rolling bearing, which has roller bodies (1) and bearing tracks on two mutually movable parts (2, 3), characterized holders (4) or other the roller bodies in the electrically conductive bearing, the area of which is of a roller body accompanying the roller bodies via lubricating film adjacent portions, substantially larger than the contact area between roller body and bearing race, and of a detector (12) for determining the reaction of a change in the condition of the lubricating film 10 15 20 ba 447 010 6 between roller bodies and bearing tracks on the electrical parameters of an electrical measuring signal transmitted to the roller body holder or said second body. 6. Anordning enligt patentkravet 5, k ä n n e - t e c k n a d därav, att de elektriskt ledande partierna är elektriskt förbundna inbördes och med det ena be- lägget (13) i en kopplingskondensator (13, 14), vars kapacitans är stor i jämförelse med kapacitansen mellan de ledande partierna och rullkropparna (1).Device according to claim 5, characterized in that the electrically conductive portions are electrically connected to each other and to one of the covers (13) in a coupling capacitor (13, 14), the capacitance of which is large in comparison with the capacitance. between the conductive portions and the roller bodies (1). 7. Anordning enligt patentkravet 5, k ä n n e - t e c k n a d därav, att de elektriskt ledande partierna inbördes är elektriskt sammankopplade i två eller flera grupper (5, 6) samt att åtminstone en mätsignalen induktivt mottagande spole (9) är inkopplad mellan skilda grupper.7. Device according to claim 5, characterized in that the electrically conductive portions are electrically interconnected in two or more groups (5, 6) and in that at least one measuring signal inductively receiving coil (9) is connected between different groups. 8. Anordning enligt patentkravet 7, k ä n n e - t e c k n a d därav, att rullkroppshållaren (4) eller nämnda andra kropp består av tvâ eller flera samman- hängande, var för sig elektriskt ledande delar (5, 6), som är sammanhållna av elektriskt isolerande delar (7, 8).Device according to claim 7, characterized in that the roller body holder (4) or said second body consists of two or more continuous, separately electrically conductive parts (5, 6), which are held together by electrically insulating parts (7, 8). 9. Anordning enligt patentkravet 8, k ä n n e - t e c k n a d därav, att rullkroppshållaren (4) eller nämnda andra kropp består av en kombination av ledande plast eller metall och isolerande plast. I 'v , Pong Qvint!Device according to claim 8, characterized in that the roller body holder (4) or said second body consists of a combination of conductive plastic or metal and insulating plastic. I 'v, Pong Qvint!
SE8402451A 1984-05-07 1984-05-07 Method and device for roll bearing lubrication monitoring SE447010B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE8402451A SE447010B (en) 1984-05-07 1984-05-07 Method and device for roll bearing lubrication monitoring
PCT/SE1985/000440 WO1987003053A1 (en) 1984-05-07 1985-11-06 Method and device for monitoring the lubricating film in a rolling bearing and cage therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8402451A SE447010B (en) 1984-05-07 1984-05-07 Method and device for roll bearing lubrication monitoring

Publications (3)

Publication Number Publication Date
SE8402451D0 SE8402451D0 (en) 1984-05-07
SE8402451L SE8402451L (en) 1985-11-08
SE447010B true SE447010B (en) 1986-10-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
SE8402451A SE447010B (en) 1984-05-07 1984-05-07 Method and device for roll bearing lubrication monitoring

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SE (1) SE447010B (en)
WO (1) WO1987003053A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1024450C2 (en) * 2003-10-03 2005-04-05 Skf Ab Method and device for measuring the thickness of a lubricating layer between surfaces.
EP1701049A1 (en) * 2005-03-07 2006-09-13 Ab Skf Method and system for detecting contacts in a hybrid bearing
CN102782348A (en) * 2010-03-01 2012-11-14 西门子公司 Bearing module having a sensor device
DK2484900T3 (en) 2011-02-08 2017-05-22 Siemens Ag Method of lubricating at least one blade pitch bearing of a wind turbine
JP6430704B2 (en) * 2014-02-13 2018-11-28 株式会社ＥｘＨ Power supply system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2025693A1 (en) * 1970-05-21 1971-12-09 Siemens Ag Procedure for monitoring the operating condition of rolling bearings
NL8103161A (en) * 1981-06-30 1983-01-17 Skf Ind Trading & Dev MEASUREMENT SYSTEM FOR MEASURING THE VARIATION OF THE CAPACITIVE IMPEDANCE OF A BEARING-MOUNTED BEARING.

Also Published As

Publication number Publication date
WO1987003053A1 (en) 1987-05-21
SE8402451D0 (en) 1984-05-07
SE8402451L (en) 1985-11-08

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