DE2337934A1 - Warning device for disc brake lining wear - has orifice in pressure piston that opens with excessive piston travel - Google Patents

Warning device for disc brake lining wear - has orifice in pressure piston that opens with excessive piston travel

Info

Publication number
DE2337934A1
DE2337934A1 DE19732337934 DE2337934A DE2337934A1 DE 2337934 A1 DE2337934 A1 DE 2337934A1 DE 19732337934 DE19732337934 DE 19732337934 DE 2337934 A DE2337934 A DE 2337934A DE 2337934 A1 DE2337934 A1 DE 2337934A1
Authority
DE
Germany
Prior art keywords
piston
warning device
pressure
orifice
brake lining
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.)
Pending
Application number
DE19732337934
Other languages
German (de)
Inventor
Siegfried Beuchert
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE19732337934 priority Critical patent/DE2337934A1/en
Publication of DE2337934A1 publication Critical patent/DE2337934A1/en
Pending 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
    • F16D66/028—Apparatus for indicating wear using electrical detection or indication means with non-electrical sensors or signal transmission, e.g. magnetic, optical
    • 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
    • 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

Abstract

The device can only be used where the brakes are actuated by at least one pressure operated piston and an improvement on electrical systems where a special design is necessary for each different type of brake lining. There is an orifice in the cylinder, normally connecting it to the pressure reservoir. It is only opened if the piston moves to a position indicating that the max. allowable brake tolerance has been taken up. Pressure is then generated through the orifice operating a pressure switch that in turn actuates a warning light. The piston has a circular groove on the pressure side and a sealing ring fits in this.

Description

Daimler-Benz Aktiengesellschaft D a im 972lk/k Daimler-Benz Aktiengesellschaft D a im 972 l k / k

Stuttgart-Untertürkheim 23.JuIi 1973Stuttgart-Untertürkheim June 23, 1973

"Warneinrichtung zur Anzeige der Bremsbelagabnutzung bei Scheibenbremsen""Warning device for displaying brake pad wear on disc brakes"

Die Erfindung betrifft eine Warneinrichtung zur Anzeige der Bremsbelagabnutzung bei Scheibenbremsen, die durch mindestens einen druckmittelbeaufschlagten, in einem Zylinder geführten Kolben betätigt werden.The invention relates to a warning device for displaying the brake lining wear in disc brakes, which is caused by at least a pressurized medium, guided in a cylinder Pistons are actuated.

Bei bereits bekannten Au»führungen von Warn- und Verschleißanzeigevorrichtungen sind in den Bremsbelag elektrische Fühler, Leiter oder Leiterschleifen eingebettet, die nach Erreichen einer bestimmten Abnutzung berührt, freigelegt oder zerstört werden und dabei einen Kontakt schließen oder unterbrechen und eine optische oder akustische Anzeige auslösen.With already known designs of warning and wear display devices electrical sensors, conductors or conductor loops are embedded in the brake lining, which after reaching a certain amount of wear and tear, exposed or destroyed, thereby making or breaking a contact and trigger an optical or acoustic display.

Der Nachteil solcher Ausführungen besteht darin, daß keine in großer Seri« hergestellten herkömmlichen Bremsbeläge verwendet werden können, sondern je nach Ausführung verschiedene Sonderanfertigungen verfügbar sein müssen. Konstruktion und Herstellung sind dadurch relativ aufwendig.The disadvantage of such designs is that no conventional brake pads manufactured in large series are used can be, but depending on the design, various custom-made products must be available. Construction and Production are therefore relatively expensive.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, mit baulich und herstellungsmäßig einfachen Mitteln eine wirkungsvolle Warneinrichtung zu schaffen, wobei an vorhandenen Scheibenbremsen in Serienausführung nur geringe Verändex'ungen erforderlich sind, wovon die dem Verschleiß unterworfenen Bremsbeläge nicht betroffen sind.The invention is based on the object with structurally and manufacturing-wise simple means to create an effective warning device, with existing ones Disc brakes in series design only minor changes are required, which does not affect the brake pads subject to wear.

509807/0480509807/0480

- 2 - Daim - 2 - Daim

Die Erfindung besteht darin, daß sich im Zylinder eine Bohrung befindet, die normal durch den Kolben vom Druckmittelraum getrennt ist und nur dann freigegeben wird, wenn der Kolben beim Bremsen eine Stellung einnimmt, die der maximal zulässigen Belagabnutzung entspricht, wobei durch das dann in die Bohrung eintretende Druckmittel eine Warneinrichtung betätigt.The invention consists in the fact that there is a bore in the cylinder which normally passes through the piston from the pressure medium space is separated and is only released when the piston assumes a position during braking that is the maximum corresponds to permissible lining wear, with a warning device being triggered by the pressure medium then entering the bore actuated.

In vorteilhafter Ausgestaltung der Erfindung ist für die Betätigung der Warneinrichtung ein herkömmlicher Bremslichtschalter vorgesehen.In an advantageous embodiment of the invention is for the actuation A conventional brake light switch is provided for the warning device.

In weiterer Ausgestaltung der Erfindung weist der Kolben auf der Druckmittelseite eine Ringnute auf, in die ein Lippendichtring montiert ist.In a further embodiment of the invention, the piston has an annular groove on the pressure medium side into which a lip seal ring is mounted.

Die erfindungsgemäße Ausführung zeichnet sich aus durch Einfachheit und Übersichtlichkeit, wobei mit wenigen Teilen eine einwandfreie überwachung und Anzeige der Bremsbelagabnutzung erzielt werden kann.The embodiment according to the invention is distinguished by its simplicity and clarity, with a few parts a perfect monitoring and display of the brake pad wear can be achieved.

In der Zeichnung ist eine Ausführungsform der Erfindung im Schnitt beispielsweise dargestellt.In the drawing, an embodiment of the invention is in Section shown for example.

Die Scheibenbremse nach der Zeichnung zeigt im wesentlichen einen Zylinder 1 mit einem Kolben 2. Der Bremsklotz besteht aus einem Bremsbelagträger 3 mit Bremsbelag h% der mit einer Bremsscheibe 5 zusammenwirkt·The disc brake according to the drawing essentially shows a cylinder 1 with a piston 2. The brake pad consists of a brake lining carrier 3 with a brake lining h % which interacts with a brake disc 5.

Im Zylinder 1 befindet sich eine dessen Wand durchdringende Bohrung 7> die in ihrem äußeren Bereich ein Gewinde zum Einschrauben eines Bremslichtschalters 6 aufweist· Sobald derIn the cylinder 1 there is a bore 7> penetrating its wall which has a thread in its outer area for screwing in a brake light switch 6 · As soon as the

509807/0480509807/0480

- 3 - Paint 9724/4 - 3 - Paint 9724/4

Bremsbelag 4 eine vorbestimmte Abnutzung erreicht hat, gibt die Kante eines Lippendichtringes 8, der in einer Ringnut des Kolbens 2 angeordnet ist, die Bohrung 7 für den Übertritt des Druckmittels aus dem Druckmittelraum 9 zum Bremslichtschalter 6 frei und betätigt ihn bei jeder Bremsung, wobei ein Stromkreis geschlossen und eine Warnlampe 10 zum Aufleuchten gebracht wird.Brake lining 4 has reached a predetermined level of wear, the edge of a lip seal 8, which is in an annular groove of the Piston 2 is arranged, the bore 7 for the passage of the pressure medium from the pressure medium space 9 to the brake light switch 6 free and actuates it with each braking, whereby a circuit is closed and a warning lamp 10 is brought to light will.

Mit der erfindungsgemäßen Warneinrichtung kann die Belagabnutzung jeder einzelnen Scheibenbremse überwacht werden.With the warning device according to the invention, the lining wear each individual disc brake can be monitored.

Es ist aber auch denkbar, daß bei einem ausreichenden Volumen an Bremsflüssigkeit ein zentral angeordneter Bremslichtschalter mit Warnlantpe genügt, der über entsprechende Schläuche, z.B. Tecalemitschläuche, mit jeder einzelnen Scheibenbremse verbunden ist.But it is also conceivable that a centrally arranged brake light switch is provided with a sufficient volume of brake fluid with warning lantern is sufficient, which is connected to each individual disc brake via corresponding hoses, e.g. Tecalemit hoses connected is.

Aus Gründen der Sicherheit ist das Maß X1 von der Kante des Lippendichtringes 8 bis zur Mitte der Bohrung 7 kleiner als das Maß X2 der vollen Bremsbelagstärke, damit nach Aufleuchten der Warnlampe 10 die begonnene Fahrt noch rechtzeitig beendet und zur Erneuerung des Bremsbelages eine Werkstatt aufgesucht werden kann.For reasons of safety, the dimension X 1 from the edge of the lip seal 8 to the center of the hole 7 is smaller than the dimension X 2 of the full brake lining thickness, so that after the warning lamp 10 lights up, the journey that has started ends in good time and a workshop to replace the brake lining can be visited.

509807/0480509807/0480

Claims (3)

- k - Daim 972k/lk - k - Daim 972k / l k AnsprücheExpectations (l.) Warneinrichtung zur Anzeige der Dremsbelagabnutzung bei Scheibenbremsen, die durch mindestens einen druckmittelbeaufschlagten, in einem Zylinder geführten Kolben betätigt werden, dadurch gekennzeichnet, daß sich im Zylinder(l.) Warning device for displaying the drems lining wear at Disc brakes operated by at least one pressurized, piston guided in a cylinder are actuated, characterized in that in the cylinder (1) eine Bohrung (7) befindet, die normal durch den Kolben(1) a bore (7) is located normal through the piston (2) vom Druckmittelraum (9) getrennt ist und nur dann freigegeben wird, wenn der Kolben (2) beim Bremsen eine Stellung einnimmt, die der maximal zulässigen Belagabnutzung entspricht, wobei durch das dann in die Bohrung (7) eintretende Druckmittel eine Warneinrichtung (Warnlampe 10) betätigt wird.(2) is separated from the pressure medium chamber (9) and is only released if the piston (2) a Assumes a position that corresponds to the maximum permissible lining wear, whereby then into the hole (7) entering pressure medium a warning device (warning lamp 10) is actuated. 2. Warneinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß für die Betätigung der Warneinrichtung ein herkömmlicher Bremslichtschalter (6) vorgesehen ist.2. Warning device according to claim 1, characterized in that a conventional one for the actuation of the warning device Brake light switch (6) is provided. 3. Warneinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Kolben (2) auf der Druckmittelseite eine Ringnute aufweist, in die ein Lippendichtring (8) montiert ist.3. Warning device according to claim 1, characterized in that the piston (2) has an annular groove on the pressure medium side has, in which a lip seal (8) is mounted. 5098077 04805098077 0480
DE19732337934 1973-07-26 1973-07-26 Warning device for disc brake lining wear - has orifice in pressure piston that opens with excessive piston travel Pending DE2337934A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19732337934 DE2337934A1 (en) 1973-07-26 1973-07-26 Warning device for disc brake lining wear - has orifice in pressure piston that opens with excessive piston travel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732337934 DE2337934A1 (en) 1973-07-26 1973-07-26 Warning device for disc brake lining wear - has orifice in pressure piston that opens with excessive piston travel

Publications (1)

Publication Number Publication Date
DE2337934A1 true DE2337934A1 (en) 1975-02-13

Family

ID=5888015

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19732337934 Pending DE2337934A1 (en) 1973-07-26 1973-07-26 Warning device for disc brake lining wear - has orifice in pressure piston that opens with excessive piston travel

Country Status (1)

Country Link
DE (1) DE2337934A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636185A1 (en) * 1986-08-19 1988-02-25 Volkswagen Ag Monitoring device for the pressure medium-operated brake system of a vehicle
CN106218629A (en) * 2016-08-25 2016-12-14 广西柳工机械股份有限公司 There is the clamp-type brake unit of abrasion pre-warning

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3636185A1 (en) * 1986-08-19 1988-02-25 Volkswagen Ag Monitoring device for the pressure medium-operated brake system of a vehicle
CN106218629A (en) * 2016-08-25 2016-12-14 广西柳工机械股份有限公司 There is the clamp-type brake unit of abrasion pre-warning
CN106218629B (en) * 2016-08-25 2018-12-07 广西柳工机械股份有限公司 Clamp-type brake apparatus with abrasion pre-warning

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