DE3032515A1 - Brake lining wear measurement equipment - has angular movement detectors bearing against curved iron plate away from magnet - Google Patents

Brake lining wear measurement equipment - has angular movement detectors bearing against curved iron plate away from magnet

Info

Publication number
DE3032515A1
DE3032515A1 DE19803032515 DE3032515A DE3032515A1 DE 3032515 A1 DE3032515 A1 DE 3032515A1 DE 19803032515 DE19803032515 DE 19803032515 DE 3032515 A DE3032515 A DE 3032515A DE 3032515 A1 DE3032515 A1 DE 3032515A1
Authority
DE
Germany
Prior art keywords
iron
magnet
permanent magnet
brake
sheet
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
DE19803032515
Other languages
German (de)
Inventor
Berend Dipl.-Ing. 3000 Hannover Kleen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wabco Westinghouse Fahrzeugbremsen GmbH
Original Assignee
Wabco Fahrzeugbremsen GmbH
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
Priority claimed from DE19803010498 external-priority patent/DE3010498A1/en
Application filed by Wabco Fahrzeugbremsen GmbH filed Critical Wabco Fahrzeugbremsen GmbH
Priority to DE19803032515 priority Critical patent/DE3032515A1/en
Publication of DE3032515A1 publication Critical patent/DE3032515A1/en
Ceased legal-status Critical Current

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
    • 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
    • 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
    • F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
    • F16D66/025—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness sensing the position of parts of the brake system other than the braking members, e.g. limit switches mounted on master cylinders

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The brake-lining wear measurement equipment comprises a permanent magnet fixed to the brake camshaft, particularly of a drum brake. The magnet is embedded in a disc, whose angular movement is detected by a series of elements sensitive to a magnetic field and mounted along a curve and fed to a display or data-processing unit. The sides of the elements (6) furthest from the magnet (4) bear against a first curved iron plate (8). The side of the magnet furthest from the elements bears against a second such plate (9) forming part of the disc surface (5).

Description

Vorrichtung zur Bremsbelag-VerschleißmessungDevice for brake lining wear measurement

Zusatz zu Patent ... (Patentanmeldung P 30 10 498.4) Die Erfindung bezieht sich auf eine Vorrichtung zur Bremsbelag-Verschleißmessung nach dem Oberbegriff des Patentanspruchs 1.Addition to patent ... (patent application P 30 10 498.4) The invention relates to a device for brake lining wear measurement according to the preamble of claim 1.

Die in der Hauptanmeldung P 30 10 498.4 beschriebene Vorrichtung zur Bremsbelag-Verschleißmessung besteht im mechanischen Teil aus einem auf der Bremswelle eines Fahrzeugs befestigten Geber. Dem Geber steht ein an der Karosserie befestigter Meßwertaufnehmer gegenüber. Dieser besteht aus einer Reihe von magnetfeldempfindlichen Elementen, z.B. Hallgeneratoren, die auf einer Kreisbahn angeordnet sind. Auf diese Elemente wirkt das Magnetfeld eines im Geber befestigten Dauermagneten ein.The device described in the main application P 30 10 498.4 The mechanical part of the brake lining wear measurement consists of one on the brake shaft a vehicle mounted encoder. The encoder has an attached to the body Transducer opposite. This consists of a number of magnetic field sensitive Elements, e.g. Hall generators, which are arranged on a circular path. To this Elements are affected by the magnetic field of a permanent magnet fixed in the encoder.

Die Drehung der Bremswelle von der Ruhestellung bis zum Greifen der Bremsbelege wird mittels einer elektronischen Auswerteschaltung erfaßt und auf einem Display, das im Führerhaus des Fahrzeugs angeordnet ist, angezeigt.The rotation of the brake shaft from the rest position to gripping the Brake pads is detected by means of an electronic evaluation circuit and on a Display, which is arranged in the driver's cab of the vehicle, displayed.

Bei dieser Anordnung liegt eine Schwierigkeit darin, daß der Abstand (Luftspalt) zwischen dem Dauermagneten und den Hallgeneratoren zur Erzielung eines ausreichenden Signals möglichst gering sein muß. Die Montage von Geber und Meßwertaufnehmer muß daher mit relativ geringen Toleranzen erfolgen.One problem with this arrangement is that the distance (Air gap) between the permanent magnet and the Hall generators to achieve a sufficient signal must be as low as possible. The assembly of the encoder and transducer must therefore be done with relatively small tolerances.

Der Erfindung liegt deshalb die Aufgabe zugrunde, bei einer Vorrichtung der eingangs genannten Art den Luftspalt bzw. Schaltabstand zwischen Geber und Meßwertaufnehmer zu vergrößern und damit eine Fertigung und Montage dieser Teile mit größeren Toleranzen zu ermöglichen.The invention is therefore based on the object of a device of the type mentioned above, the air gap or switching distance between the transmitter and the transducer to enlarge and thus a production and assembly of these parts with larger tolerances to enable.

Diese Aufgabe wird durch die im Patentanspruch 1 enthaltene Erfindung gelöst.This object is achieved by the invention contained in claim 1 solved.

Die in der Zeichnung dargestellte Vorrichtung zur Bremsbelag-Verschleißmessung besteht aus einem Geber 2, welcher auf der Bremswelle 1 eines Fahrzeugs befestigt ist.The device shown in the drawing for measuring brake lining wear consists of an encoder 2, which is attached to the brake shaft 1 of a vehicle is.

Das aktive Teil des Gebers ist ein Dauermagnet 4. Dieser ist in einer Scheibe 5 eingebettet. Die Scheibe 5 besteht dabei aus einem magnetisch nicht leitenden Material, z.B. Aluminium oder Kunststoff. Dem Geber 2 gegenüber liegt ein Meßwertaufnehmer 3. Dieser besteht aus einem ortfest an der Karosserie des Fahrzeugs befestigtem Gehäuse 7, in welchem auf einer Kreisbahn mehrere magnetfeldempfindliche Elemente 6, die z.B. Hallgeneratoren sein können, angeordnet sind. Der elektrische Anschluß der Elemente 6 erfolgt über eine Leitung 13.The active part of the encoder is a permanent magnet 4. This is in a Disk 5 embedded. The disk 5 consists of a magnetically non-conductive Material, e.g. aluminum or plastic. Opposite the transmitter 2 is a transducer 3. This consists of a stationary attached to the body of the vehicle Housing 7, in which several magnetic field sensitive elements on a circular path 6, which can be e.g. Hall generators, are arranged. The electrical connection of the elements 6 takes place via a line 13.

Zur Verstärkung des magnetischen Flusses ist hinter den magnetfeldempfindlichen Elementen 6 in geringem Abstand ein kreisförmig gebogenes erstes Eisenblech 8 angebracht.To strengthen the magnetic flux is behind the magnetic field sensitive Elements 6 a circularly curved first iron sheet 8 attached at a small distance.

Auf der Außenfläche des Gebers 2 ist ein zweites Eisenblech 9 angebracht. Dieses ist im Bereich des Dauermagneten 4 mit einer Einbuchtung 10 versehen und so hinter dem Magneten 4 hindurchgeführt. Zur Verringerung des Luftspaltes zwischen dem ersten Eisenblech 8 und dem zweiten Eisenblech 9 ist das erste Eisenblech 8 an seinen Enden 11,12 nach innen umgebogen, bzw. so an die Scheibe 5 herangeführt, daß sich ein geringer Luftspalt zwischen beiden Eisenblechen ergibt.A second sheet of iron 9 is attached to the outer surface of the encoder 2. This is provided with an indentation 10 in the area of the permanent magnet 4 and so passed behind the magnet 4. To reduce the air gap between the first iron sheet 8 and the second iron sheet 9 are the first iron sheet 8 bent inwards at its ends 11, 12 or so brought up to the disk 5, that there is a small air gap between the two iron sheets.

Durch die beschriebenen Maßnahmen ergibt sich eine Verstärkung des magnetischen Flusses. Dieser läuft, ausgehend von Dauermagneten 4 zunächst über den Luftspalt d 1 zum ersten Eisenblech 8, von diesem über die beiden Luftspalte d 2 und d 3 zum zweiten Eisenblech 9 und von hier wieder zum Dauermagneten 4. Durch den verstärkten magnetischen Fluß ist es möglich, bei gleichbleibender Ansteuerung der magnetfeldempfindlichen Elemente 6 den Luftspalt zwischen Geber und Meßwertaufnehmer relativ groß zu machen. Hierdurch können ebenfalls die bei der Herstellung und Montage vorgegebenen Toleranzen erhöht werden.The measures described result in a strengthening of the magnetic flux. Starting from permanent magnets 4, this initially overflows the air gap d 1 to the first iron sheet 8, from this over the two air gaps d 2 and d 3 to the second iron sheet 9 and from here again to the permanent magnet 4. Through the increased magnetic flux is possible with constant control the magnetic field sensitive elements 6 the air gap between the transmitter and the transducer make it relatively large. This can also be used during manufacture and assembly specified tolerances are increased.

LeerseiteBlank page

Claims (4)

Patentansprüche 1 Vorrichtung zur Bremsbelag-Verschleißmessung mit ei Bremswelle, die beim Bremsen verdreht wird und über Nocken Bremsbeläge betätigt, insbesondere für Tromm bremsen, wobei an der Bremswelle ein als Dauermagnet ausgebildeter Geber befestigt ist, der in einer verdrehfest auf der Bremswelle befestigten Scheibe eingebet ist, dessen Drehwinkel von einem ortsfest angebrachten, us mehreren auf einem Kreisbogen angeordneten magnetfeldemfindlichen Elementen bestehenden Meßwertaufn mer abtastbar ist und über eine Elektronik einem Di play oder einer Meßwertverarbeitung zugeführt wird, nach Patent... (Patentanmeldung P 30 10 498.4), dadurch gekennzeichnet, daß die dem Dauermagnet (4) abgewandten Seiten der magnetfeldempfindlichen Elemente (6) an ein ringförmig gebogenes erstes Eisenblech (8) anstoßen und/oder die den magnetfeldempfindlichen Elementen (6) abgewandte Seite des Dauermagneten (4) an ein ebenfalls ringförmig gebogenes zweites Eisenblech (9) anstößt, welches mindstens teilweise die Oberfläche der Scheibe (5) bildet.Claims 1 device for brake lining wear measurement with ei brake shaft, which is rotated during braking and actuates brake linings via cams, especially for drum brakes, with a permanent magnet on the brake shaft Encoder is attached, which is in a rotatably mounted on the brake shaft disc is embedded, the angle of rotation of a stationary attached, us several on an arc of a circle arranged magnetic field sensitive elements existing measurement values mer can be scanned and via electronics to a Di play or measured value processing is supplied, according to patent ... (patent application P 30 10 498.4), characterized in that that the sides of the magnetic field sensitive elements facing away from the permanent magnet (4) (6) abut an annularly bent first sheet of iron (8) and / or the Magnetic field-sensitive elements (6) facing away from the side of the permanent magnet (4) one also second sheet iron (9), bent in a ring, abuts, which at least partially forms the surface of the disc (5). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das zweite Eisenblech (O? hinter dem Dauermagneten (4) eine nach innen gerichtete Einbiegung (10) aufweist.2. Apparatus according to claim 1, characterized in that the second Iron sheet (O? Behind the permanent magnet (4) an inward bend (10). 3. Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die beiden Enden (11,12) des ersten Eisenblechs (8) zur Verringerung des Luftspaltes zwischen den beiden Eisenblechen (8, 9) an die Scheibe (5) herangeführt sind.3. Apparatus according to claim 1 and 2, characterized in that the two ends (11, 12) of the first iron sheet (8) to reduce the air gap are brought up to the disc (5) between the two iron sheets (8, 9). 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß des erste Eisenblech (8) an den Enden (11,12! nach innen umgebogen ist.4. Apparatus according to claim 3, characterized in that the first Sheet iron (8) is bent inwards at the ends (11, 12!).
DE19803032515 1980-03-19 1980-08-29 Brake lining wear measurement equipment - has angular movement detectors bearing against curved iron plate away from magnet Ceased DE3032515A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803032515 DE3032515A1 (en) 1980-03-19 1980-08-29 Brake lining wear measurement equipment - has angular movement detectors bearing against curved iron plate away from magnet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803010498 DE3010498A1 (en) 1980-03-19 1980-03-19 Brake spindle pick=up unit, esp. for vehicle wheels - has peripheral array of hall elements forming signal input to multiplexer and computer
DE19803032515 DE3032515A1 (en) 1980-03-19 1980-08-29 Brake lining wear measurement equipment - has angular movement detectors bearing against curved iron plate away from magnet

Publications (1)

Publication Number Publication Date
DE3032515A1 true DE3032515A1 (en) 1982-04-22

Family

ID=25784398

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803032515 Ceased DE3032515A1 (en) 1980-03-19 1980-08-29 Brake lining wear measurement equipment - has angular movement detectors bearing against curved iron plate away from magnet

Country Status (1)

Country Link
DE (1) DE3032515A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212279A1 (en) * 1992-04-11 1993-10-14 Hella Kg Hueck & Co Wear monitor for disc brake pad esp. on motor vehicle - provides continuous linear indication of stroke of brake piston until alarm is given at critical deg. of abrasion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212279A1 (en) * 1992-04-11 1993-10-14 Hella Kg Hueck & Co Wear monitor for disc brake pad esp. on motor vehicle - provides continuous linear indication of stroke of brake piston until alarm is given at critical deg. of abrasion

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Owner name: WABCO WESTINGHOUSE FAHRZEUGBREMSEN GMBH, 3000 HANN

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