WO2008106924A1 - Device for the detection of the operating state of a friction lining - Google Patents

Device for the detection of the operating state of a friction lining Download PDF

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Publication number
WO2008106924A1
WO2008106924A1 PCT/DE2008/000270 DE2008000270W WO2008106924A1 WO 2008106924 A1 WO2008106924 A1 WO 2008106924A1 DE 2008000270 W DE2008000270 W DE 2008000270W WO 2008106924 A1 WO2008106924 A1 WO 2008106924A1
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WO
WIPO (PCT)
Prior art keywords
friction lining
chip
operating state
friction
chips
Prior art date
Application number
PCT/DE2008/000270
Other languages
German (de)
French (fr)
Inventor
Robert Felger
Christian Spandern
Original Assignee
Luk Lamellen Und Kupplungsbau Beteiligungs Kg
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 Luk Lamellen Und Kupplungsbau Beteiligungs Kg filed Critical Luk Lamellen Und Kupplungsbau Beteiligungs Kg
Priority to DE112008000382T priority Critical patent/DE112008000382A5/en
Publication of WO2008106924A1 publication Critical patent/WO2008106924A1/en

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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • F16D66/026—Apparatus for indicating wear using electrical detection or indication means indicating different degrees of lining wear
    • F16D66/027—Sensors therefor
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D2066/001—Temperature

Definitions

  • the invention relates to a device for detecting the operating state of a friction lining on a Reibbelagango.
  • a wear indicator by means of electronic sensors is disclosed for example in DE 44 45 577 C1. Furthermore, the wear of friction linings can be determined from a model calculation, in which the energy introduced into the friction system is summed up over the operating period and, in conjunction with experimentally determined data for the wear of a friction lining, is returned to the current operating state of the friction lining.
  • the object of the invention is to propose an alternative solution to these methods, which operates reliably in their evaluation and against influences, especially in the environment of a motor vehicle.
  • the invention is achieved by a device for detecting the operating state of a friction lining on a friction lining, in which at least one chip is provided according to the RFID principle.
  • a material mix for example, for use in friction clutches, a material mix may be provided which comprises friction components, organic components, binder and filler components. contains substances.
  • Such friction linings can be configured annularly, wherein preferably two annular linings can be combined with mutually remote, engageable friction surfaces with the interposition of pad spring segments to a friction lining with friction linings, which can be attached to a clutch disc. Friction linings can furthermore be so-called wound coverings, in which textiles or fibers soaked in covering components are made into a covering with other covering components.
  • the number of windings can determine the lining thickness, so that the winding process can be stopped at one or more desired locations in order to accommodate one or more chips at a desired lining thickness.
  • a residual thickness of the friction lining can be derived after a corresponding period of operation with a corresponding abrasion by the behavior of the chip or chips is evaluated.
  • At least one chip is provided for detecting the operating state of the friction lining.
  • chips according to the RFID principle also called transponder, RFID chip, smart tag, etc.
  • clutch discs with friction lining carriers and friction linings mounted thereon, which are preferably adapted to the conditions in the vicinity of couplings.
  • chips which are resistant and mechanically stabilized for example introduced in appropriate packagings, up to 400 ° C.
  • the friction linings can be distributed annularly and several chips distributed over the circumference of each friction lining. It is also possible to disperse differing chips with respect to their response across the thickness of the friction lining.
  • a wear detection of the friction lining can take place in that for communication with the at least one chip a transmitter unit and for evaluation of the signals an evaluation unit is provided. As long as the thickness of the friction lining is greater than a predetermined as a wear reserve thickness communication between the transmitter unit of the chip and the evaluation take place; ie as long as the at least one chip can still be read, the clutch is still in order. However, as soon as the friction lining has worn away on the friction lining carriers so far that the at least one chip is also removed, no further signals from the evaluation unit are received by the latter. This time is an indication of the size of the abrasion or the size of the remaining wear reserve.
  • a warning is issued in this failure of a signal response of the at least one chip to protect the clutch or individual parts of the clutch from damage.
  • This warning can be in the form of an acoustic or optical signal.
  • the warning can be output as a level, for example, via a color gamut on a display, by different tones whose height increases according to the decrease in the wear reserve.
  • a sequence of sounds is conceivable, the repetition of which is shortened by the wear o. ⁇ .
  • a step-like warning can be achieved when multiple chips are used, whose properties are temperature-dependent, so that from the resulting different properties on the size of the wear can be closed.
  • At least one chip of a plurality of chips can also be thermally insulated or temperature-compensated. Also, corresponding signals or their evaluation results can be supplied to a non-volatile memory, which can be read out and evaluated by the maintenance personnel, for example in the form of a fault memory.
  • the driver or the maintenance personnel can thereby be informed of the size of the wear of the friction linings.
  • warning signals can be evaluated by an evaluation unit, which is housed in a separate control unit or integrated as a module in another control unit.
  • an evaluation unit can form one or more predefinable or predetermined signal thresholds for the determined signals, in which different reactions, for example driver information, warnings or output signals for further automated activities of the control unit are initiated.
  • a wear device can be activated from this warning in special design examples with compressed clutches by causing an over-travel of the clutch so that the clutch travel of a new clutch is restored.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Mechanical Operated Clutches (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

The invention relates to a device for the detection of the operating state of a friction lining on a friction lining carrier, which by the insertion of a chip operating according to the RFID principle for the detection of the operating state of the friction lining is simple to operate with regard to the analysis thereof and operates reliably against influencing factors, particularly in the environment of a motor vehicle.

Description

Vorrichtung zur Erkennung des Betriebszustandes eines Reibbelags Device for detecting the operating state of a friction lining
Die Erfindung betrifft eine Vorrichtung zur Erfassung des Betriebszustandes eines Reibbelages auf einem Reibbelagträger.The invention relates to a device for detecting the operating state of a friction lining on a Reibbelagträger.
Bekannt ist eine Vielzahl von Methoden zur Verschleißdetektion von Reibbelägen. Mechanische Verschleißanzeiger für Reibungskupplungen sind in der Regel direkt in oder an der Kupplungsglocke angeordnet, wobei der Kupplungsbelagverschleiß über eine mechanische Konstruktion angezeigt oder abgelesen werden kann. Derartige Verschleißanzeiger sind beispielsweise in der DE 196 37 901 A1 offenbart.A variety of methods for wear detection of friction linings are known. Mechanical wear indicators for friction clutches are typically located directly in or on the clutch bell, whereby the clutch pad wear can be displayed or read via a mechanical construction. Such wear indicators are disclosed for example in DE 196 37 901 A1.
Eine Verschleißanzeige mittels elektronischer Sensoren offenbart beispielsweise die DE 44 45 577 C1. Weiterhin lässt sich der Verschleiß von Reibbelägen aus einer Modellrechnung bestimmen, in dem die in das Reibsystem eingetragene Energie über die Betriebsdauer aufsummiert wird und in Verbindung mit experimentell ermittelten Daten zum Verschleiß eines Reibbelages auf den aktuellen Betriebszustand des Reibbelages zurück geschlossen wird.A wear indicator by means of electronic sensors is disclosed for example in DE 44 45 577 C1. Furthermore, the wear of friction linings can be determined from a model calculation, in which the energy introduced into the friction system is summed up over the operating period and, in conjunction with experimentally determined data for the wear of a friction lining, is returned to the current operating state of the friction lining.
Aufgabe der Erfindung ist es, zu diesen Verfahren eine alternative Lösung vorzuschlagen, die in ihrer Auswertung einfach und gegen Einflüsse insbesondere in der Umgebung eines Kraftfahrzeugs zuverlässig arbeitet.The object of the invention is to propose an alternative solution to these methods, which operates reliably in their evaluation and against influences, especially in the environment of a motor vehicle.
Die Erfindung wird durch eine Vorrichtung zur Erfassung des Betriebszustandes eines Reibbelages auf einem Reibbelagträger gelöst, in dem zumindest ein Chip nach dem RFID- Prinzip vorgesehen ist.The invention is achieved by a device for detecting the operating state of a friction lining on a friction lining, in which at least one chip is provided according to the RFID principle.
Dabei ist unter dem Betriebszustand eines Reibbelages ein zeitlich wechselnder Zustand während des Betriebes des Reibbelages zu sehen. Insbesondere können dies aktuelle Zu- . stände in Abhängigkeit von der Temperatur, der eingetragenen Energie und/oder in Abhängigkeit von der Dauer eines gleitenden Zustandes des Reibbelags auf einer Gegenreibfläche sein. Auch kann der Zustand von der Betriebsdauer abhängig als Betriebszustand aufgefasst werden.It is under the operating condition of a friction lining to see a temporally changing state during operation of the friction lining. In particular, this can current Zu-. be conditions depending on the temperature, the energy input and / or depending on the duration of a sliding state of the friction lining on a Gegenreibfläche. The state can also be considered as operating state depending on the operating time.
Als Reibbelag kann beispielsweise für die Verwendung in Reibungskupplungen ein Materialmix vorgesehen werden, der Reibkomponenten, organische Anteile, Binder- und Füll- stoffe enthält. Derartige Reibbeläge können ringförmig ausgestaltet sein, wobei vorzugsweise zwei Ringbeläge mit voneinander abgewandten, in Eingriff zu bringenden Reibflächen unter Zwischenlegung von Belagfedersegmenten zu einem Reibbelagträger mit Reibbelägen kombiniert werden können, die an einer Kupplungsscheibe befestigt sein können. Reibbeläge können weiterhin so genannte gewickelte Beläge sein, bei denen in Belagskomponenten getränkte Textilien oder Fasern mit weiteren Belagsbestandteilen zu einem Belag gefertigt werden. Dabei kann die Anzahl der Wicklungen die Belagstärke bedingen, so dass der Wickel- prozess an einer oder mehreren gewünschten Stellen angehalten werden kann, um einen o- der mehrere Chips bei einer gewünschten Belagstärke unterzubringen. Je nach Einbringung bei einer vorgegebenen Belagstärke kann nach einer entsprechenden Betriebsdauer mit einem entsprechenden Abrieb eine Reststärke des Reibbelages abgeleitet werden, indem das Verhalten des oder der Chips ausgewertet wird.As a friction lining, for example, for use in friction clutches, a material mix may be provided which comprises friction components, organic components, binder and filler components. contains substances. Such friction linings can be configured annularly, wherein preferably two annular linings can be combined with mutually remote, engageable friction surfaces with the interposition of pad spring segments to a friction lining with friction linings, which can be attached to a clutch disc. Friction linings can furthermore be so-called wound coverings, in which textiles or fibers soaked in covering components are made into a covering with other covering components. In this case, the number of windings can determine the lining thickness, so that the winding process can be stopped at one or more desired locations in order to accommodate one or more chips at a desired lining thickness. Depending on the introduction at a predetermined lining thickness, a residual thickness of the friction lining can be derived after a corresponding period of operation with a corresponding abrasion by the behavior of the chip or chips is evaluated.
Gemäß der Erfindung wird zumindest ein Chip zur Erkennung des Betriebszustandes des Reibbelages vorgesehen. Vorteilhafterweise können Chips nach dem RFID-Prinzip, auch Transponder, RFID-Chip, Smart Tag etc genannt, in Kupplungsscheiben mit Reibbelagträgern und auf diesen angebrachten Reibbelägen eingesetzt werden, die vorzugsweise den Bedingungen in der Umgebung von Kupplungen angepasst sind. Insbesondere können bis zu 400° C resistente und mechanisch stabilisierte, beispielsweise in entsprechenden Verpackungen eingebrachte, Chips vorgesehen sein. Dabei können die Reibbeläge ringförmig und mehrere Chips über den Umfang jedes Reibbelags verteilt angeordnet sein. Auch ist es möglich, bezüglich ihres Ansprechverhaltens sich unterscheidende Chips über die Dicke des Reibbelages zu verteilen.According to the invention, at least one chip is provided for detecting the operating state of the friction lining. Advantageously, chips according to the RFID principle, also called transponder, RFID chip, smart tag, etc., are used in clutch discs with friction lining carriers and friction linings mounted thereon, which are preferably adapted to the conditions in the vicinity of couplings. In particular, it is possible to provide chips which are resistant and mechanically stabilized, for example introduced in appropriate packagings, up to 400 ° C. In this case, the friction linings can be distributed annularly and several chips distributed over the circumference of each friction lining. It is also possible to disperse differing chips with respect to their response across the thickness of the friction lining.
Eine Verschleißdetektion des Reibbelages kann dadurch erfolgen, dass zur Kommunikation mit dem zumindest einen Chip eine Transmittereinheit und zur Auswertung dessen Signale eine Auswerteeinheit vorgesehen ist. Solange die Dicke des Reibbelages größer ist als eine als Verschleißreserve vorgegebene Dicke kann eine Kommunikation zwischen der Transmittereinheit des Chips und der Auswerteeinheit stattfinden; d.h. so lange der mindestens eine Chip noch gelesen werden kann, ist die Kupplung noch in Ordnung. Sobald jedoch der Reibbelag auf den Reibbelagträgern soweit abgetragen ist, dass der mindestens eine Chip mit abgetragen wird, werden von diesem keine Signale mehr von der Auswerteeinheit empfangen. Dieser Zeitpunkt ist ein Indiz für die Größe des Abriebes bzw. der Größe der noch verbleibenden Verschleißreserve. Gleichzeitig wird bei diesem Ausfall einer Signalantwort des zumindest einen Chips eine Warnung ausgegeben, um die Kupplung bzw. einzelne Teile der Kupplung vor einer Beschädigung zu schützen. Diese Warnung kann in Form eines akustischen oder optischen Signals erfolgen. Bei einem Einsatz über die Belagdicke unterschiedlich ansprechender Chips kann die Warnung als Stufe ausgegeben werden, beispielsweise über eine Farbskala auf einem Display, durch unterschiedliche Töne deren Höhe entsprechend der Abnahme der Verschleißreserve zunimmt. Weiterhin ist eine Abfolge von Tönen denkbar, deren Wiederholung mit dem Verschleiß verkürzt wird o. ä. Ebenfalls kann eine stufenartige Warnung erreicht werden, wenn mehrere Chips eingesetzt werden, deren Eigenschaften temperaturabhängig sind, so dass aus den resultierenden unterschiedlichen Eigenschaften auf die Größe des Verschleißes geschlossen werden kann. Zur Erkennung unterschiedlicher Verschleißzustände kann auch mindestens ein Chip von mehreren Chips thermisch isoliert oder temperaturkompensiert ausgelegt werden. Auch können entsprechende Signale oder deren Auswerteergebnisse einem nicht flüchtigen Speicher zugeführt werden, der beispielsweise in Form eines Fehlerspeichers vom Wartungspersonal ausgelesen und ausgewertet werden kann.A wear detection of the friction lining can take place in that for communication with the at least one chip a transmitter unit and for evaluation of the signals an evaluation unit is provided. As long as the thickness of the friction lining is greater than a predetermined as a wear reserve thickness communication between the transmitter unit of the chip and the evaluation take place; ie as long as the at least one chip can still be read, the clutch is still in order. However, as soon as the friction lining has worn away on the friction lining carriers so far that the at least one chip is also removed, no further signals from the evaluation unit are received by the latter. This time is an indication of the size of the abrasion or the size of the remaining wear reserve. At the same time a warning is issued in this failure of a signal response of the at least one chip to protect the clutch or individual parts of the clutch from damage. This warning can be in the form of an acoustic or optical signal. When used on the lining thickness differently responding chips, the warning can be output as a level, for example, via a color gamut on a display, by different tones whose height increases according to the decrease in the wear reserve. Furthermore, a sequence of sounds is conceivable, the repetition of which is shortened by the wear o. Ä. Also, a step-like warning can be achieved when multiple chips are used, whose properties are temperature-dependent, so that from the resulting different properties on the size of the wear can be closed. For detecting different wear conditions, at least one chip of a plurality of chips can also be thermally insulated or temperature-compensated. Also, corresponding signals or their evaluation results can be supplied to a non-volatile memory, which can be read out and evaluated by the maintenance personnel, for example in the form of a fault memory.
Der Fahrer bzw. das Wartungspersonal kann hierdurch auf die Größe des Verschleißes der Reibbeläge hingewiesen werden.The driver or the maintenance personnel can thereby be informed of the size of the wear of the friction linings.
Weiterhin können die beschriebenen Warnsignale von einer Auswerteeinheit ausgewertet werden, die in einem separaten Steuergerät untergebracht oder als Modul in einem weiteren Steuergerät integriert ist. Eine derartige Auswerteeinheit kann für die ermittelten Signale eine oder mehrere vorgebbare oder vorgegebene Signalschwellen bilden, bei denen unterschiedliche Reaktionen, beispielsweise Fahrerinformationen, Warnungen oder Ausgangssignale für weitere automatisierte Aktivitäten des Steuergerätes initiiert werden.Furthermore, the described warning signals can be evaluated by an evaluation unit, which is housed in a separate control unit or integrated as a module in another control unit. Such an evaluation unit can form one or more predefinable or predetermined signal thresholds for the determined signals, in which different reactions, for example driver information, warnings or output signals for further automated activities of the control unit are initiated.
Weiterhin kann aus dieser Warnung in speziellen Ausgestaltungsbeispielen mit zugedrückten Kupplungen durch Herbeiführen eines Überweges der Kupplung eine Verschleißeinrichtung so aktiviert werden, dass der Kupplungsweg einer neuen Kupplung wiederhergestellt wird. Furthermore, a wear device can be activated from this warning in special design examples with compressed clutches by causing an over-travel of the clutch so that the clutch travel of a new clutch is restored.

Claims

Patentansprüche claims
1. Vorrichtung zur Erfassung des Betriebszustandes eines Reibbelages auf einem Reibbelagträger, dadurch gekennzeichnet, dass zumindest ein Chip nach dem RFID-Prinzip zur Erkennung des Betriebszustandes des Reibbelags vorgesehen ist.1. A device for detecting the operating state of a friction lining on a Reibbelagträger, characterized in that at least one chip is provided according to the RFID principle for detecting the operating state of the friction lining.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der zumindest eine Chip im oder am Reibbelag angeordnet ist.2. Apparatus according to claim 1, characterized in that the at least one chip is arranged in or on the friction lining.
3. Vorrichtung nach Anspruch 2 , dadurch gekennzeichnet, dass mehrere sich bezüglich ihres Ansprechverhaltens unterscheidende Chips über eine Dicke des Reibbelages verteilt sind.3. Apparatus according to claim 2, characterized in that a plurality of different with respect to their response chips are distributed over a thickness of the friction lining.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Eigenschaften mehrer Chips über die Temperatur unterschiedlich sind.4. Device according to one of claims 1 to 3, characterized in that the properties of several chips are different over the temperature.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der zumindest eine Chip thermisch isoliert ist.5. Device according to one of claims 1 to 4, characterized in that the at least one chip is thermally insulated.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der zumindest eine Chip temperaturkompensiert ist.6. Device according to one of claims 1 to 5, characterized in that the at least one chip is temperature compensated.
7. Vorrichtung nach einem der Ansprüche 1 bis 6., dadurch gekennzeichnet, dass der Reibbelag ringförmig und mehrere Chips über den Umfang des Reibbelags verteilt sind.7. Device according to one of claims 1 to 6, characterized in that the friction lining are distributed annularly and a plurality of chips over the circumference of the friction lining.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zur Kommunikation mit dem zumindest einen Chip eine Transmittereinheit und zur Auswertung dessen Signale eine Auswerteeinheit vorgesehen ist.8. Device according to one of claims 1 to 7, characterized in that for communication with the at least one chip, a transmitter unit and for evaluating the signals of an evaluation unit is provided.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass bei Ausfall einer Signalantwort des zumindest einen Chips eine Warnung ausgegeben wird. 9. Apparatus according to claim 8, characterized in that in case of failure of a signal response of the at least one chip, a warning is issued.
PCT/DE2008/000270 2007-03-05 2008-02-13 Device for the detection of the operating state of a friction lining WO2008106924A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112008000382T DE112008000382A5 (en) 2007-03-05 2008-02-13 Device for detecting the operating state of a friction lining

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007010509 2007-03-05
DE102007010509.8 2007-03-05

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WO2009050001A1 (en) * 2007-10-10 2009-04-23 Continental Teves Ag & Co. Ohg Brake shoe
DE102017116339A1 (en) 2017-07-20 2019-01-24 Schaeffler Technologies AG & Co. KG Method for detecting pad wear
DE102017122451A1 (en) 2017-09-27 2019-03-28 Schaeffler Technologies AG & Co. KG Method for detecting an operating state of a friction clutch

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DE102015220100B4 (en) 2014-10-16 2023-08-03 Schaeffler Technologies AG & Co. KG Transmission system for a motor vehicle for the transmission of production-relevant characteristic data in the same transmission system of a motor vehicle
FR3056045B1 (en) * 2016-09-13 2019-10-04 Valeo Embrayages TORQUE TRANSMISSION DEVICE EQUIPPED WITH A RADIO-IDENTIFICATION TRANSPONDER

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US20060042734A1 (en) * 2004-08-24 2006-03-02 Turner Douglas D Wear component and warning system
US20060124214A1 (en) * 2004-12-15 2006-06-15 International Business Machines Corporation Monitoring of wearing surface layer thickness
US20060226984A1 (en) * 2005-04-08 2006-10-12 Lucas Menke Wear detection by transponder destruction
US20060273148A1 (en) * 2005-06-06 2006-12-07 Karstens Christopher K Detecting wear through use of information-transmitting devices

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Publication number Priority date Publication date Assignee Title
US20020116992A1 (en) * 2001-02-26 2002-08-29 Trw Inc. System and method for monitoring wear of a vehicle component
US20060042734A1 (en) * 2004-08-24 2006-03-02 Turner Douglas D Wear component and warning system
US20060124214A1 (en) * 2004-12-15 2006-06-15 International Business Machines Corporation Monitoring of wearing surface layer thickness
US20060226984A1 (en) * 2005-04-08 2006-10-12 Lucas Menke Wear detection by transponder destruction
US20060273148A1 (en) * 2005-06-06 2006-12-07 Karstens Christopher K Detecting wear through use of information-transmitting devices

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050001A1 (en) * 2007-10-10 2009-04-23 Continental Teves Ag & Co. Ohg Brake shoe
DE102017116339A1 (en) 2017-07-20 2019-01-24 Schaeffler Technologies AG & Co. KG Method for detecting pad wear
WO2019015725A1 (en) 2017-07-20 2019-01-24 Schaeffler Technologies AG & Co. KG Method for detecting pad wear
DE102017122451A1 (en) 2017-09-27 2019-03-28 Schaeffler Technologies AG & Co. KG Method for detecting an operating state of a friction clutch

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DE112008000382A5 (en) 2009-11-19
DE102008008908A1 (en) 2008-09-11

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