DE2014588C3

DE2014588C3 - Wear indicator for friction brakes in motor vehicles

Info

Publication number: DE2014588C3
Application number: DE19702014588
Authority: DE
Inventors: Heinz Gunter Endnch Paul 6000 Frankfurt Hahm
Original assignee: Alfred Teves GmbH
Current assignee: Continental Teves AG and Co oHG
Filing date: 1970-03-26
Publication date: 1977-07-21

Description

scheibenbremse,disc brake,

F i g. 2 die perspektivische Darstellung einer Kreuzfeder mit dem elektrischen Warnkontakt in Form einer Bei einer bekannten Verschleißanzeigevorriehtung 65 Drahtschlaufe,F i g. 2 the perspective view of a cross spring with the electrical warning contact in the form of a With a known wear indicator device 65 wire loop,

der im Oberbegriff des Anspruchs 1 aufgeführten F i g. 3 eine andere Ausführungsform des elektrischenthe F i g listed in the preamble of claim 1. 3 another embodiment of the electrical

Gattung (DT-OS 19 42 167, Fig. 1 bis 9) ist der isolierte Warnkontakts, ebenfalls in perspektivischer Darstel-Stromleiter als verformbare Lamelle ausgebildet, die am lung, undGenus (DT-OS 19 42 167, Fig. 1 to 9) is the isolated warning contact, also shown in perspective view of the conductor designed as a deformable lamella on the lung, and

F i g. 4 und 5 perspektivische Darstellungen anderer wieder verwendet werden kann, bedeutet es keinen Ausführungen des elektrischen Warnkontakts für unzulässigen Mehraufwand, gleichzeitig eine neue Teilbelagscheibenbremsen, die ohne Miederhaltefeder Kreuzfeder mit einer intakten Drahtwindung 21 auskommen. einzusetzen.F i g. 4 and 5 perspective representations of others can be reused, it means none Versions of the electrical warning contact for inadmissible additional effort, at the same time a new one Partially lined disc brakes that have a cross spring without a corset retaining spring and an intact wire coil 21 get along. to use.

Die Teilbelagscheibenbremse gemäß Fig. 1 besteht 5 Im vorstehend beschriebenen Sinne ist es selbstverim wesentlichen aus den beiden miteinander verbünde- ständlich nicht nur möglich, die Drahtwindung 21 an der nen Bremssattelhälften 1 und 2, den Radzylinderbohrun- Kreuzfeder anzubringen, sondern der Draht kann auch gen 3 und 4 mit den Radzylinderkolben 5 und 6, die axial die Bolzen 11,12 umfassen, wie dies in F i g. 3 dargestellt verschiebbar angeordnet sind und den Bremsbelägen 9, ist, da die Lageraugen 22, 23 der Rückenplatten 9, 10 13 bzw. 10, 14. Die Radzylinderkolben 5, 6 wirken mit 10 sich aufeinander zu bewegen und die Isolation der ihren Stirnflächen 7, 8 auf die Rückenplatten 9, 10 ein, Drahtwindung 24,25 zerstört.The partially lined disc brake according to FIG. 1 consists of 5 In the sense described above, it is self-contained It is essentially not only possible to combine the two with one another, the wire winding 21 on the nen brake caliper halves 1 and 2 to attach the wheel cylinder bore and cross spring, but the wire can also gen 3 and 4 with the wheel cylinder pistons 5 and 6, which axially encompass the bolts 11, 12, as shown in FIG. 3 shown are arranged displaceably and the brake pads 9, since the bearing eyes 22, 23 of the back plates 9, 10 13 and 10, 14. The wheel cylinder pistons 5, 6 act with 10 to move towards each other and the insulation of the their end faces 7, 8 on the back plates 9, 10, wire winding 24,25 destroyed.

die ihrerseits auf Bolzen 11, 12 am Bremssattel Im allgemeinen wird der eine Pol der Stromquelle derwhich in turn on bolts 11, 12 on the brake caliper. In general, one pole of the power source is the

verschiebbar gehalten und geführt sind. Die Bolzen 11, Warneinrichtung (nicht dargestellt) an das Fahrzeug 12 können zum Zwecke des Austauschs der Bremsbelä- selbst angeschlossen sein, während der andere Pol der ge in Pfeilrichtung A aus dem Bremssatlel 1, 2 15 Stromquelle isoliert gegenüber den Fahrzeugzeugteilen herausgezogen werden. zu der Kreuzfeder der Bremse und von hier zurare slidably held and guided. The bolts 11, warning device (not shown) on the vehicle 12 can be connected for the purpose of replacing the brake linings, while the other pole of the ge in the direction of arrow A is pulled out of the brake caliper 1, 2 15 power source isolated from the vehicle parts. to the cross spring of the brake and from here to the

Jede Rückenplatte 9, 10 ist mit einem Reibkissen 13 Warneinrichtung am Armaturenbrett geführt ist. Um bzw. 14 versehen, die beim Bremsvorgang gegen die nicht jedesmal, wenn der Austausch der abgenutzten rotierende Bremsscheibe 15 gepreßt werden. Zwischen Bremsbacken notwendig geworden ist, einen Draht, den beiden im Bremssatte! 1,2 gelagerten Bolzen 11,12 *o dessen Isolierung unverletzt ist, von der Stromquelle ist eine Kreuzfeder (Niederhaltefeder) 16 angeordnet, über die Bremse zur Warneinrichtung hin verlegen zu wie sie beispielsweise die DT-PS 11 94 275 beschreibt, müssen, ist es zweckmäßig, am Bremssattel t, 2 deren U-förmig abgebogene sich quer zur Bremsscheibe elektrische Stecker vorzusehen, derart, daß nur ein 15 erstreckenden Arme 17, 18 an den Rückenplatten 9 relativ kurzes Drahtstück ausgetauscht werden muß.
bzw. 10 anliegen, während die beiden anderen Arme 19, 25 In F i g. 4 ist eine Vorrichtung dargestellt, die auf eineEach back plate 9, 10 is guided with a friction pad 13 warning device on the dashboard. To or 14 provided, which are not pressed each time the worn rotating brake disc 15 during the braking process against the. It has become necessary to have a wire between the brake shoes, the two in the brake caliper! 1,2 stored bolts 11,12 * o whose insulation is intact, a cross spring (hold-down spring) 16 is arranged from the power source, via the brake to the warning device to relocate as it is, for example, the DT-PS 11 94 275 describes It is expedient to provide electrical plugs on the brake caliper t, 2 whose U-shaped bent transversely to the brake disc, in such a way that only one 15-extending arms 17, 18 on the back plates 9, relatively short piece of wire, has to be exchanged.
or 10, while the other two arms 19, 25 in F i g. 4 shows a device that is based on a

20 der Kreuzfeder 16 von unten her die Bolzen 11, 12 Niederhaltefeder verzichten kann. In dem dargestellten umfassen bzw. sich an diesen abstützen. Beispiel sind die Rückenplatten 26, 27 mn den auf ihnen20 of the cross spring 16 from below, the bolts 11, 12 hold-down spring can be dispensed with. In the illustrated embrace or support yourself on these. Example are the back plates 26, 27 with the ones on them

Beim Bremsvorgang werden die Radzylinderkolben befestigten Reibkissen 28, 29 auf den Bolzen 30 für die 5,6 in Pfeilrichtung Bbzw. Cauf die Bremsscheibe 15 zu Halterung der Bremsbeläge aufgeschoben, wobei der bewegt. Dabei werden die Bremsbeläge 9,13 bzw. 10,14 30 Bolzen 30 mit zwei Querbohrungen 31, 32 versehen isi, gegen die Bremsscheibe 15 gepreßt. Nach einer Anzahl durch die der vom elektrischen Strom durchflossenc von Abbremsungen sind die Reibkissen 13, 14 so weit Leiter 33 hindurchgeführt ist. Die Bohrungen 34, 35 in abgenutzt, daß die sich mit den Kolben 5, 6 den Rückenplatten 26, 27 sind so angeordnet, daß die verschiebenden Rückenplatten 9, 10 den Armen 19, 20 Isolation auf dem elektrischen Leiter 33 abgequetscht der Kreuzfeder 16 nähern. 35 wird, wenn die Rückenplatten 26, 27 sich dem zwischenDuring the braking process, the friction pads 28, 29 attached to the wheel cylinder pistons are pushed onto the bolts 30 for the 5.6 in the direction of arrows B and C on the brake disc 15 to hold the brake linings, with the moving. The brake linings 9, 13 and 10, 14, 30 bolts 30 are provided with two transverse bores 31, 32 and are pressed against the brake disk 15. After a number of decelerations through which the electric current flows, the friction pads 13, 14 are passed as far as conductor 33 is passed. The bores 34, 35 worn in that the back plates 26, 27 with the pistons 5, 6 are arranged so that the sliding back plates 9, 10 approach the arms 19, 20 insulation on the electrical conductor 33 pinched off the cross spring 16. 35 is when the back plates 26, 27 are between

Da einer der freien Arme 19,20 der Kreuzfeder 16 mit den Bohrungen 31, 32 befindlichen Stück des Stromleieinem isolierten Draht umwickelt ist, der von einem ters so weit genähert haben, daß die Bohrungen 34, 35 elektrischen Strom durchflossen ist und in den von den Rückenplatten überfahren werden.
Stromkreis einer elektrisch arbeitenden Warnvorrich- Wie F i g. 5 zeigt, kann auf die Querbohrungen in demSince one of the free arms 19.20 of the cross spring 16 with the bores 31, 32 located piece of Stromleieinem insulated wire is wrapped, which have approached so far from a ters that the bores 34, 35 electrical current flows through and into the Back plates are driven over.
Circuit of an electrically operating warning device As in FIG. 5 shows, can on the cross bores in the

tung eingeschaltet ist. werden die sich weiter aufeinan- 40 Haltebolzen verzichtet werden, wenn anstelle dieser der zu bewegenden Rückenplatten 9, 10 die Drahtwin- Bohrungen auf dem Bolzen 37 ein Distanzstück, dung 21 berühren, die Isolation von dem stromleitenden beispielsweise eine Distanzhülse 38. aufgeschoben wird. Draht abquetschen und einen elektrischen Kurzschluß dessen Länge etwa der Breite der Bremsscheibe zwischen dem stromdurchflossenen Draht 21 und den entspricht. Der stromdurchflossene Leiter 39 muß in Rückenplatten 9, 10 erzeugen. Die nicht näher ₄₅ diesem Falle so um den Bolzen 37 herumgewickelt dargestellte elektrisch arbeitende Vorrichtung zur werden, daß mindestens eine Wicklung zwischen der Anzeige der Grenze der zulässigen Abnutzung von (ringförmigen) Stirnfläche 40 des Distanzstücks 38 und Reibbelägen löst nun in dem Augenblick ein Warnsignal der auf den Bolzen 37 aufgeschobenen Rückenplatte zu aus, in dem der Kurzschluß zwischen der Drahtwindung liegen kommt. In diesem Falle wird also die Isolation desdevice is switched on. 40 retaining bolts will be dispensed with if instead of these of the back plates 9, 10 to be moved, the wire winches on the bolt 37 touch a spacer 21, the insulation from the electrically conductive, for example, a spacer sleeve 38 is pushed on. Pinch off the wire and create an electrical short circuit, the length of which corresponds approximately to the width of the brake disc between the wire 21 and the current flowing through it. The current-carrying conductor 39 must generate in back plates 9, 10. The electrically operating device not shown in detail _{45 in} this case wound around the bolt 37 so that at least one winding between the display of the limit of permissible wear of the (annular) end face 40 of the spacer 38 and the friction linings now triggers a warning signal at the moment the back plate pushed onto the bolt 37, in which the short circuit comes to lie between the wire winding. In this case, the isolation of the

21 auftritt. Das Warnsignal wird nun den Fahrer des 50 Stromleiters 39 zwischen der Stirnfläche 40 des Kraftfahrzeugs veranlassen, die Bremsbeläge 9,13 bzw. Distanzstücks 38 und der der Bremsscheibe zugekehr-10,14 durch neue zu ersetzen. ten Fläche der Rückenplatte zerquetscht, wenn die21 occurs. The warning signal is now the driver of the 50 conductor 39 between the end face 40 of the Motor vehicle cause the brake pads 9,13 or spacer 38 and the brake disc facing-10,14 replace with new ones. th face of the back plate crushed when the

Da die Praxis gezeigt hat, daß bei abgenutzten Reibkissen so weit abgenutzt sind, daß sie durch neue Bremsbelägen nicht nur die Bremsbeläge durch neue zu ersetzt werden müssen,
ersetzen sind, sondern oft auch die Kreuzfeder nicht 55Since practice has shown that worn friction pads are so worn that they not only have to be replaced with new brake pads,
replace, but often also the cross spring 55

Hierzu 3 Blatt ZeichnungenFor this purpose 3 sheets of drawings

Claims

Patent application area · Brake housing is set and in the Bcwcgungsbe- Γ »ι« ιιια · »μι uuuv. ^. ^ ^ Friction cushion carrier protruding, immediately in front of the kkll did B ^^ ^ eg g

1. Wear display device for friction rotating, as Gegenkontaktstellc serving brake brakes of motor vehicles, in which an insulated disc ends. With increasing wear of the friction lining, the conductor of an electrical signal circuit is connected to the pad carrier of the insulated lamella and a stationary, axially non-displaceable part, which bends when the wear limit is reached against the brake and, due to the relative movement, the rotating brake disc, which now provides insulation between the brake pad carrier and does not abrade axially and actuates the warning device after reaching an electrically displaceable brake part when the contact is reached. The permissible brake pad wear with a conductive 10 insulation of the lamella ensures that as a result of the opposing contact point comes into contact, which contamination etc. no undesired contact causes the destruction of the insulation and one is triggered and the fastening of the isolated electrical contact is brought about by the in the current conductor at least a signal circuit enables a warning device to be actuated on the fixed housing, in principle a subsequent installation. The disadvantage is that the contact is, however, that the mating contact point is formed by the timing area of the insulated conductor (21,24,33,39) rotating brake disk, whose electrically immovable on an already existing conductive connection with the one at one pole of the Stationary braking part in the range of motion of the circuit connected vehicle is not always attached to the mating contact point, which is not guaranteed by a. The friction surface of the rotating part (9, 10, 22, 23, 26, 27) of the brake that makes the brake lining advance movement with the brake disc can be damaged by the material of the current conductor. It is also disadvantageous that it is formed with the insulation of the conductor only being tied to the brake disc by the spatial arrangement of the conductor, which is based solely on the change in distance.
Touching the two interacting components There is also another wear and tear on the device

bar parts becomes ineffective. 25 device (DT-OS 19 42 167, F i g. 11 to 14) known in the

2. Apparatus according to claim 1 for a Teilbe- a non-rotating part of the brake that the lag disc brake with a hold-down spring for sliding movement of the brake lining participates, as the friction pad carrier, characterized in that the mating contact point is used. This mating contact point is the conductor through which the electric current flows is a moving one with the brake shoes Insulated wire (21) is one that is parallel to the 30th element, which is an encapsulated contact switch Brake disc extending arm (20) of the down operated. Such a warning device is indeed an unstoppable spring (16) wraps around in such a way that the friction pad is dependent on environmental influences and none occurs Sträger (9, 10) touch the wire and its impairment of the braking surfaces, a Nachträgli insulator but not squeeze them off before they get to the rather installation of such a device Brake disk-parallel arms (19, 20) of the low 35 possible without taking any precautions on the brake put on retaining spring (16). are hit. Furthermore, such a device

3. Apparatus according to claim 1 for a partial costly to manufacture and requires the lag disk brake with bolts to guide the use of a special switch element.
Friction pad, characterized in that one of the It is also already known (DTPS IO 39 854), by means of bolts (30) at least one transverse bore (31) 40 grinding of insulated wire lines, through which the insulated, electrical current brake lining are arranged, a closed circuit conductor (wire 33) is passed in such a way that the short-circuit, whereby the circuit is interrupted moving in the direction of the brake disc and a control lamp is made to go out.
The object underlying the invention is limit the insulation of the conductor destroyed. 45 therein, a warning device of the preamble of

4. Apparatus according to claim 3, characterized in that claim 1 specified genus is designed so that draws that the bolt (30) for guiding the friction cushion carriers with this type of warning devices (26, 27) at least two drilling targets (low influence of oxidation, gene (31, 32), through which the isolated dirt and icing on the functional current conductor is passed through. 50 speed, subsequent installation) are even easier to achieve,

5. The device according to claim 1 for a part being- wherein damage or an unfavorable bearing disc brake with bolts to guide the impregnation of the brake disc surface in any case Friction pad, characterized in that it is avoided on the. The warning device should Guide pins (37) one or more spacers - particularly simple in construction and inexpensive to manufacture, ke (38) are postponed, with the isolated 55 This task is performed by the in claim 1 Conductor so wrapped around the bolt marked invention solved. Beneficial excellence, that the shifting on the bolt configurations of the invention are in the subclaims Friction pad carrier indicated when the lining wear is reached.

limit the insulation of the conductor between the In the description are exemplary embodiments of the

Destroy the spacer and the friction pad carrier. 60 invention explained in more detail with reference to the figures. It shows

F i g. 1 the section through the saddle of a partial covering