DE1942167A1 - brake - Google Patents

Description

Priority: 19o8ο 1988 - France

DI® invention relates to the display of the wear worn by a brake friction lining particularly for brakes _s is equipped with © in automotive »

Indeed, it is desirable that the user of such a vehicle should be notified of the moment the friction linings of the vehicle's brakes hit. Srreiehtj value considered taking into account a reasonable I Sehutaes as maximum wii "d _o

For this purpose, the invention has a brake. Sum object which has an organ to be braked, furthermore at least one breath organ which is movable with respect to the organ to be braked under the effect of an actuating organ, as well as a fixed organ and at least a movable organ, which ent = wed-sp that braking organ can be or any other organ ₈ 009809/1216 " ¹ ^"

M 8136.; "'- ■. ■',. .. —V * ν:

the movement of which corresponds to that of the braking elements, wherein the brake according to the invention differs in that the fixed organ has a wear and tear device that is arranged and formed so that it is carried by the movable member after a certain wear and tear of the one carried by the braking member Friction lining is put into action «.

Preferably, this wear indicator is an electrical switch that is connected to the circuit of a signal device that emits a visible or audible or any other signal and is arranged, for example, on the dashboard of the vehicle _e with at least one of the contacts of the switch from the fixed member of the respective Brake is worn »

This arrangement »which is suitable for all types of brakes, be it as disc brakes ₉ drum brakes _s combined disc and drum brakes or other types of construction, is effective and particularly easy to use and / or install, even with existing brakes.

The features and advantages of the invention are also reflected the following description of various design examples® in connection with the accompanying drawings, namely

Figure 1 _o sine partial view in axial section of a "disc brake, -

009809/1216 '~ ² "·

M 8136 'Λ

the rait of a wear display device according to the invention " device is equipped;

Fig. 2 a part of the brake according to the line ZI-IX in Figo 1, which section only concerns the brake disc and one of the associated brake shoes;

3 shows a partial view of the brake, seen in the direction of the arrow III in FIG. _9, which view relates to only part of the wear indicator according to the invention and the associated brake shoe;

Figo * shows a partial view of the wear display device according to the invention on an enlarged scale

FIG. S, 6 and 7 are views that are similar to those shown in Figures 1, 2, 3 and relate to another Ausführungsforn of the invention wherein S Figo only a portion of Figure 1 corresponds to {..;

FIGS. 8, 9 and 10 are views similar to FIGS. 1, 2, 3,

and relate to a further embodiment of the invention, FIG. 8, like FIG. 5, only a part of FIG. 1 corresponds to J.

009809/12 1-6 ■

M 8136 V

Fig. 11 is a plan view of another type of disc brake, in the case of an embodiment of the invention used has been, being part of the? Brake shown in section is ϊ

FIG. 12 shows a sectional view of a wear according to the invention "display device" with which "the brake as shown in FIG. 11" is equipped; ^;

FIG. 13 is a plan view of a disc brake of the type shown in FIG shown type, which with another version * For the invention, wear and tear is mandatory is equipped;

FIG. 14 is a partial view in section along the line XEV-XIV in FIG

Fig. 13, with only the transmission ring, the wear indicator and part of the solid support, on which the display device is mounted, are shown.

In Fig. 1 a known disc brake is shown «Grasping a disc 10, a fixed carrier 11, brake shoes 12, 13, which are arranged perpendicular to the disc 10 in recesses 1%, 16 sliding-Jäar, which are provided in the carrier 11, <tinen Fixed Betatigungeblodc 16, which is firmly connected to the carrier 11 is (not shown below) and with a cylindrical chamber

- - '■■■. "' ....- ■■ '' - -« * - ■ .. ■ '. "■ - ■ 009809/1216 ■

M 8136 '■' .. '~ $

is formed »in which one in opposite directions Piston 18 "which acts directly on the brake shoe 13" and a piston 19 which can slide over the brake shoe 12 a transmission piece 20 acts. In the illustrated exemplary embodiment, the transmission piece 20 is essentially the shape of a ring "surrounding the actuation block 16 and the brake shoes 12 and 13" and the actuation block 16 has an extension 21 »which is perpendicular to the brake shoes is·

According to the invention, a brake indicator device 25 is carried by the fixed operating block 16.

In the embodiment shown in Fig. 1-3, the Wear display device essentially formed by a deformable metallic lamella 26, which is covered on all of its surfaces with an insulating layer 26A of lacquer or the like and is designed so that it is, for example, through an insulating screw 27 can be attached to the end of the extension 21 of the actuating block 16 and, after moving around this, successively perpendicular to the brake shoe 12 a section 28 "which is essentially perpendicular to the disk 10" is essentially parallel to the disk 10 Section 29 and an end section 30 directed towards Seheibe 10,

0 0 9 8 0 9/1216 " ⁵ ~

I * 8136 G ".;

In the illustrated embodiment, in which the friction lining * 12A, 13A of the brake shoes 12, 13 and above all the lining of the shoe 12 do not cover the entirety of the corresponding lining carriers 12B, 13B, the sections 29 and 30 of the lamella 26 are above of the friction lining 12A of the brake shoe 12 in the middle zone of this brake shoe and in the immediate vicinity of the Seheibe ·

As a result of the successive braking operations and due to the wear and tear which these braking operations cause for the friction bellows of the brake shoes, the lining carrier 12B of the brake beacon 12 approaches the section 29 of the wear indicator 2S and, after contacting this section, takes it in the direction of the disk 10 with.

Is of electrical contact between the fin 26 of the indicator 25 and the disc 10 is formed: When the free end of this portion 30 occurs due to the driving with the disc 10 in contact which this covering resist layer is eroded by the disc 10, so Dafi a .

This electrical contact closes a supply circuit, not shown, by means of which a signal element, for example a luminous sign, an acoustic device or a glove is activated in a manner known per se, which is preferably displayed on the vehicle's instrument panel.

009809/121 6 " ⁶ "'-

arranges lot (not shown).

For this purpose, the lamella 26 is the display device 26 provided at its end with an end piece SS, which either adf this end is applied or is formed by a suitable deformation of the same «which end piece 35 sum Ein» Eetsen is starirnt in a sleeve 36, which is used for connection with of the mentioned supply circuit or with an intermediate circuit » which controls the feed circuit is suitable.

As mentioned, when the free end of the indicator 2S comes into contact with the disc 10, the remaining thickness of the friction lining 12A of the brake shoe 12 is at least equal to the distance G (FIG. 1) ₉ of this end from the rear front of the section 29 the indicator disconnects.

This distance G therefore determines the safety margin which is left when the wear indicator according to the invention is triggered.

The foregoing margin of safety 6 has been identified as the Defines the distance that the rear front of the section 29 of the device 25 separated from the free end of the portion 30 thereof Safety clearance is determined by the axial distance, which

0 0 9 8 0 9/1216

-7-

M 8136

the contact zone at which the brake shoe comes into contact with the display device 25 from the free end thereof separated

As shown and described above, the Abnützungsanzeigevorrichtung 25 is associated with the jaw 12 'thereof Xn modification it can also be associated with the jaw 13, in a soft case, it suffices _t 28 26 ^ to give the portion of the metallic plate, a larger length and this blade so to design,

that they work with the jaw 13 and no longer with the jaw 12 (not shown) cooperates «,

According to a further embodiment, not shown, can the lamella 26 can be divided into two arms, one of which each one of the jaws is assigned, or each of the jaws can be assigned ..- · a separate wear and tear device assigned to his

Preferably, the wear indicator 26 is assigned to the brake shoe 12, 13, of which experience shows that it

<is the one with which there is a tendency towards faster wear and tear: ο /: · - \ - '· "'>," · ν \

Fig «5-7 show another AusfÖhrungefora, wherein the ReibbelSge 12A, 13A of the brake shoes 12, 13 the main part 4" r rigid covering exchanger 12B, 13B cover the same, but in a radial direction means a slot 37 _s have the before

00980 9/12 16 ***. '■■ " '

M 8136 9.

mainly serves to remove dust and / or moisture from which the pane 10 may be covered, if necessary _D

According to the invention, this slot 37 can be used for inserting the sections 29, 30 of the display device 25 are used, which sections, as best shown in FIG. 7, a Have a design that enables such insertion.

8-10 relate to an embodiment in which the metallic lamella 26 of the display device 25 has two parallel legs 26A, 26B, each of which has a configuration similar to that described above, each of these legs having one of the side edges the brake shoe is assigned ₀ .

This arrangement makes it possible in an advantageous manner to display any inclined wear of the jaw worn friction lining too sluggish

In the various above-described embodiments of the electric switch, the metallic plate 26 forms one of the contacts is _$ actuated by a brake shoe or ο through the friction lining thereof, or by the rigid Baekeiiträger

Di «Figo 11 and 12 relate to an embodiment which in particular

009809/12 16

M 8136 40

Particularly for a disc brake, in which the carriers 12A, _9, 13A of the brake shoes 12, 13 are held in place radially by a U-shaped bracket 10, which is connected for movement to the transmission ring 20 by a rider 41, so that in this embodiment is the bracket 40 that operates the electrical switch,

FOs? For this purpose, the actuating block 16 carries a Wk Ansats 42 on the side with a threaded hole 43, which opens out through an axial channel 44 into which the free end of one of the legs of the bracket 40 is inserted »

In the sewing hole there is screwed in KQvpmv 45, which is provided with an external thread for this purpose and forms part of a wear indicator 48, which is shown in FIG

is shown separately ». .-.-..- ■. - ■■■■■ "■ '

* The * KUrpsr 48-is with a first hole 4? provided which, ™ about? © ine shoulder S3 out through a second hole 48 from

smaller. .Diameter Vaa ^ lfegert is ». . - _. ·:

The-bore-47 is through-a cover 4! of insulating material from geselllos s®n ₉ of the feet with the body 4-5 by * a crimp ■ '-. ".- connected is ο The Dsekel trlgt axially-a Kositakterhebiing 5O ₈ * with a AnschluSstift Sl in.. electrical connection is established

the w © n d @ r outer flies of the deck protrudes _o . .

009809/1216 "* ¹⁰ " ^: '"■' ■ ·

M 8136 ' M V

In the bore H7 a spring is arranged "which is supported on the one hand on the inner surface of the cover HQ and on the other hand against an intermediate washer 52 which rests against a shoulder S3 of the body" 5.

In the bore H8, a plunger 55 is slidably disposed is held in the bore by a snap ring 56, and Beyond this is extended by an actuating head 57.

The plunger core 55 is for its part hollow "d _o ho opposite the intermediate washer 52 is provided with an axial bore 60 in which a bolt 61 can slide". This bolt 61 is loaded in the direction of the intermediate washer 52 by a spring which is supported against the bottom of the bore 60, and above the intermediate washer 52 is extended by a pin 6U, which extends into the vicinity of the raised contact 50.

Depending on the wear and tear of the friction linings carried by the brake shoe 12, the transmission ring shifts in the direction of the arrow 65 in FIG. 11 and as a result of this movement comes the end of the leg of the bracket 40, which extends through the bore HH of the actuation block 16, on the actuating head 57 of the plunger core 55 to the plant.

-11-

009809V 12 16

This plunger 55 is then pushed back by the bracket 10 against the action of the spring 17 until the extension 61 of the bolt 61 comes into contact with the contact bump 50, whereby the electrical switch formed in the manner described is closed. As before, this electrical switch is in a circuit that controls the activity of a signaling element ._ · ■ V _; "Λ. -" .. -'- \ \ .-. . _: -..--- /, .- _: '\ ■'

If, due to further wear and tear, the diving « kernels 55 takes place, this movement has no effect on the Bolt 61, which is then only pressed into the bore 60 of the plunger 55 against the action of the spring 62

In the embodiment shown in FIGS. 13 and 11, the. _The wear indicating device according to the invention is carried by the fixed carrier 11 of the brake and is activated directly by the transmission ring 20 when the latter moves as a result of the wear of the friction linings of the brake shoes. This movement takes place in the direction of the arrow 70 in FIGS. 13 and 11,

In the last-mentioned embodiment, the warning display device has a metallic lamella 71, which is supported by a insulating base 72 is carried, which is attached to the carrier 11 «, The lamella 71 extends transversely to the central plane

- "". '' -12- / - - "■ Γ ^{'.-: -:} ■■.."■' ■. - ^; - ^ V 009809 / 12TG

H 8136 £ 3

of the ring 20 through a cutout 73 in this.

The lamella 71 is at its inner end on the insulating support 72 fastened by a hollow rivet 75, which at the same time ensures its electrical connection with a line 76 »and points on its central zone 77 a V-shaped configuration which is convex in the direction of the ring 20, and is also on its the free end is provided with a contact bump 78 which is adjacent to the carrier U.

In addition, the lamella 71 is made of a dust cover. compliant material 80 covered.

When the ring 20 is displaced in the direction of the arrow 70 causes the section of the cutout 73 of the same after expiry, a certain time the entrainment of the lamella 71 in the direction of the carrier 11 until the contact of the elevation 78, which is from the Lamella is supported with the support 11.

As before, this contact causes a signaling device in Activity is set.

The invention is not limited to that described and illustrated Embodiments are limited, but include any modification or combinations of the various elements, in particular

-13-

009809/1216

M 8136 JH

siohtlieh the design of the metallic lamina 26 Aussvdem is not limited the application to disc brakes, but also extends to other types of SiOH brakes "wherein the difference of the examples described way, is representative of the various AnwendungsmOgllehkeit the invention _β

Patent address:

-Hh

009809/1216

Claims (3)

M 8136 'Λ $ "claims ι 1.j brake of the type ait an organ to be braked, a Actuator, at least one brake organ which the to be braked member under the action of actuators is movable with bessug organs, may be a fixed member and at least one movable member which is either the brake organ or any other organ _e its movement to that of the brake · organs corresponds, characterized in that the fixed -Organ carries a wear indicating device which is arranged and designed so that it is put into action by the movable Or- ■■ gan after a certain wear and tear of the friction lining carried by the brake element. 2. Brake according to claim 1, characterized in that the wear indicator is an electrical switch, which is in the supply circuit of a signaling device, and at least one of the contacts of the switch is carried by the fixed organ «, -15- 009809/12 16 M 8136 ■ '[. - ■ "■; ■ 'V ^; V ^: ' 3. Brake according to claim 2, characterized in that the from solid organ-borne contact an appropriately isolate * Te metallic lamella, which has at least one deformable portion which extends into the path in the vicinity of the organ to be braked, which acts as a braking member with respect to an organ to be braked in accordance with the wear and tear of the friction lining worn by him followed • 4ο brake according to claim 3, characterized in that the metallic lamella has two parallel deformable sections, those on both sides of the braking organ in the path of the latter are arranged So brake according to claim 3, characterized in that this has two braking members, the metallic lamella has two ver-φ malleable sections, each of which is in the path of the Brake organ is arranged. 6ο brake according to claim 3, characterized in that the braking member is a brake shoe of the type whose friction lining is a Has central groove in a radial direction, in which groove the deformable portion of the metallic lamella is inserted 009809/1216 ~ ¹⁶ " M 8136 7ο brake according to claim 2, characterized in that it is a disc brake of the type comprising a disc, two brake shoes arranged on either side of the disc and held radially by a U-shaped bracket, a fixed actuating cylinder, two Pistons which are slidable in opposite directions in this cylinder, one of which acts directly on the one brake shoe and the other on the other brake shoe by means of a transmission piece, for example a bracket, ring od ο dglo, which carries the bracket mentioned, wherein the electrical switch of the wear indicator is loaded in the closing direction by the action of one of the legs of the bracket " Brake according to claim _7-9, characterized in that the switch has a hollow body which is carried by the actuating cylinder, which hollow body has a bore in which, against the action of a spring, a contact plunger core can be slid, which is arranged in the extension of the corresponding leg of the bracket «. 9ο brake according to claim 8, characterized in that the hollow » body of the switch into a hole in the fixed actuation -17- 009809/1216 Cylinder is screwed in, which bore to the outside through a channel opens into which the corresponding leg of the bracket is inserted » 10ο brake according to claim 8, characterized »that the plunger core of the switch is formed by two parts »which contrary to elastic organs, they can move telescopically within one another ο lic brake according to claim 2, characterized in that it is a disc brake of the type comprising a fixed support »a disc, two brake shoes arranged on either side of the disc, a fixed actuating cylinder, two pistons in opposite directions can slide directions in said cylinder, one of which acts directly on the one brake shoe and the other to the other brake shoe via a ObertragungsStückes, for example a strap, a ring od _or the like ", wherein the electrical switch of the Abnützungsanzeigevorrichtung in .Schließsinne the Effect of the aforementioned transference piece was subject to -18- 009809/1216 12o Soheibenbrenee according to claim Xl _t, characterized in that the electrical switch has a deformable metallic lamella, one end of which, which is insulated in a suitable manner, is attached to the fixed support and connected to a line of the associated signaling device, with one section , for example the other end of the blade carries a contact bump in the vicinity of the solid support _s while another portion extends into the path which daε transmission ^ piece opposite the Saheibe accordance with the Abnütsung the carried by the brake shoe friction linings follows. _ ■ '.' ■ _. For SOCIETE ANONYME FRANCAISE DU FERODO PAIWTAMMUK LEI 009809/1216