DE102009006285A1 - Disk brake for motor vehicle, has spring brackets that are enlarged during brake actuation for compensation of wear of lining relative to receiving areas, where spring pre-stress is measured such that brackets lie at receiving areas - Google Patents

Abstract

The brake (10) has a brake lining arrangement (18) guided into a guidance (14). A spring arrangement (28, 30) has loop-type designed elastic deformable spring brackets through which the spring arrangement is supported at receiving areas (20, 22) under spring pre-stress. The spring pre-stress is measured such that the brackets lie at the receiving areas during proper brake actuation without brake lining wear-compensation and under avoidance of relative extension of the brackets. Spring sections are enlarged during brake actuation for compensation of wear of the lining relative to the areas. The spring arrangement is made of spring sheet metal. The spring arrangement is provided with an electrical isolating coating made of plastic and rubber material.

Description

The The present invention relates to a disc brake for a motor vehicle comprising a guide in which at least a brake pad assembly is performed braking effective displaced is, wherein the brake pad assembly comprises a brake pad carrier, on which a vehicle brake pad is mounted, with a brake disc to bring about a braking effect in interaction, wherein a component of brake pad carrier and guide at least one retaining tongue and the other component of brake pad carrier and guide has at least one receiving area, wherein the at least one retaining tongue in the at least one receiving area guided is receivable, wherein at least one retaining tongue a spring arrangement is mounted, via which a restoring force due to an elastic deformation by braking effective deflection the brake pad assembly can be applied to this.

Such disc brakes are known from the prior art. For example, the document shows DE 196 50 592 A1 Such a disc brake, in which a brake pad assembly is held with a plate-shaped brake lining carrier and a brake lining arranged thereon in the guide of the disc brake via a spring arrangement. The spring assembly is elastically deformed at each displacement of the brake pad assembly. The spring arrangement adheres to a latching ridge of the guide. In the case of wear, ie when the brake pad shows signs of wear due to frequent brake actuations, the spring assembly is also elastically deformed in the context of wear compensation. However, this has the disadvantage that the restoring forces may change due to wear during braking against the wear-free execution state.

A similar problem arises in the prior art according to document DE 35 38 320 A1 , Also in this document, a brake pad assembly is biased with a return spring in a starting position, wherein in the context of a wear adjustment, the return spring is deformed more and more elastic. In this case, the size of the restoring force changes with increasing wear, because the restoring spring is accordingly deformed more elastically.

Furthermore, the state of the art still applies WO 03/027527 A1 to refer, which also shows the problem of a wear-dependent size of the restoring force.

It is an object of the present invention, to provide a disc brake of the type described, which is formed with a spring arrangement, the possibility of a Wear compensation with the same characteristics the spring force offers.

These Task is characterized by a disc brake of the beginning Kind solved, in which it is provided that the spring arrangement at least one loop-shaped elastically deformable Has spring clip, over which the spring assembly supported under spring tension on the receiving area, wherein the spring preload is dimensioned such that the spring clip at a pure brake operation without pad wear compensation abuts relative to the receiving area without relative displacement and that the spring clip at a brake application with pad wear compensation to compensate for pad wear shifted relative to the receiving area.

in principle can the disc brake according to the invention in two Variants are executed. For one thing, it is possible to execute the brake pad carrier with at least one retaining tongue, wherein the guide has a corresponding receiving area in which the brake pad carrier with its retaining tongue is guided. Alternatively, it is possible, as it were to carry out the guidance with retaining tongues, which in engage corresponding receiving areas on the brake pad carrier and lead this by.

According to the invention provided that the at least one spring clip in the frame the usual brake operation elastically deformable is, wherein the spring clip relative to a conventional Brake control - apart from the elastic Deformation - stable in position. In other words slipped the spring assembly is not relative to the receiving area of the disc brake in the context of normal brake operation, in which no lining wear compensation takes place.

Over the course of the operating life, however, the vehicle brake pad is subject to increasing wear, which must be compensated for by an adjustment of the brake pad arrangement, in order to avoid that the response of the vehicle brake deteriorates due to wear. To meet this requirement, the invention additionally provides that the spring clip for lining wear compensation moves approximately in accordance with the current lining wear relative to the housing. In other words, the spring assembly is designed with the loop-shaped elastically deformable spring clip such that the spring clip deformed elastically only in the context of the usual brake actuation, but that this deformation of the spring clip in a lining wear compensation so strong is that the spring clip can no longer sufficiently support the receiving area and consequently shifts according to the pad wear. Only then, when the pad wear is sufficiently compensated, it is again ensured that the spring clip deformed only elastically in a conventional brake actuation and does not shift. The spring clip is located on the receiving area only under friction, wherein the frictional force is determined by the size of the spring preload.

A Further development of the invention provides that the spring arrangement the retaining tongue associated with it is latched on. This ensures that that the spring arrangement relative to the retaining tongue and thus relatively is fixed to the brake pad carrier and together with the brake pad carrier relative to the receiving area in case of pad wear compensation slip. In this context, it may be provided that the Holding tongue has an undercut or a groove on the the spring assembly is supported captively. The undercut can support the locking.

Further can be provided according to the invention that the Spring assembly has a base portion, which is assigned to its Holding tongue lies flat and from the starting of the at least one spring clip preferably angled to Base section extends.

at an embodiment of the invention can be provided be that the spring arrangement comprises two spring clips, extending from the base portion on both sides of its associated retaining tongue extend. Both spring clips can be designed in this way be that they the brake pad assembly relative to the receiving area with respect to the brake disc radial play - under Spring preload - store. Alternatively, but can also be provided that the spring assembly a spring clip on the one side of the base portion and the retaining tab at least partially embracing hook element on the other side of the base portion having. In this variant, the spring arrangement ensures only one Side of the retaining tongue for a radial play under spring preload. The other side of the retaining tongue is due to the spring preload to a surface facing this receiving area moved.

According to the invention be further provided that the spring arrangement in addition at least one clamping strap to the at least one spring clip has, with which it attacks on its associated retaining tongue, wherein preferably the clamping strap engages around the retaining tongue. This is it is possible, for example, the spring arrangement with respect to secure the brake disc in the circumferential direction of the retaining tongue. The spring arrangement can in the region of the retaining tongue over the clamping plate on the surface facing the Receptive area and against this slidable be. Overall, it can be provided that the spring clip flat on a corresponding surface of the receiving area under bias is applied. By the flat Appendix the friction forces can be easier dominate. Alternatively, according to the invention but also be provided that the spring clip a curved An investment section, with which he at a corresponding Surface of the receiving area is applied. Leave it Apply higher spring forces locally.

Around in addition to the above-described possibility of use an undercut alternatively or additionally alone over the spring element a reliable holding together brake pad carrier and spring arrangement, provides a further development of Invention that the spring clip with its loop-shaped Section engages behind the associated retaining tongue.

to inexpensive and simple production can be provided according to the invention be that the spring assembly is made of a spring plate. The invention is as follows in more detail below of the preferred embodiments, configured in such a way, that when cutting the spring plate relatively little material committee results.

to Avoidance of unwanted corrosion effects sees one Further development of the invention, that the spring arrangement with a electrically insulating coating, in particular of a plastic material, preferably made of a rubber material. This will prevents between the surfaces in contact Reception area and spring arrangement and brake pad carrier when using different materials electrochemical stresses can build, which are corrosive. When using a rubber coating can still in the desired On the occurring friction forces for wear compensation Be influenced.

According to the invention be further provided that the spring assembly, the brake pad assembly relative to the guide in the radial direction with respect biasing the orientation of the brake disc.

The invention further relates to a brake pad assembly for a disc brake of the type described above, wherein the brake pad assembly comprises a brake pad carrier on which a vehicle brake pad is mounted, wherein the Brake pad carrier at least one retaining tongue with which it is receivable in a receiving area of the guide, or has a receiving area with which it receives a retaining tongue of the guide, wherein on the at least one retaining tongue a spring assembly is attached, via which a restoring force due to an elastic deformation by brake effective deflection of the brake pad assembly can be applied to this. As already explained in detail above is provided in this brake pad assembly that the spring assembly has at least one loop-shaped elastically deformable spring clip over which the spring assembly is spring biased to the receiving area, wherein the spring preload is dimensioned such that the spring clip in a pure brake operation without Pad wear compensation without relative displacement is applied to the receiving area and that the spring clip shifts relative to the receiving area in a brake application with lining wear compensation to compensate for the pad wear.

The Invention will be described below by way of example with reference to the accompanying Figures explained. They show:

1 a section of a disc brake according to the invention in a view in the direction of the axis of rotation of the disc brake;

2 a detailed perspective view of the retaining tongue of a brake lining carrier with spring arrangement;

3 a sectional view taken along section line III-III 2 ;

4 a perspective view of a brake pad assembly of a second embodiment of the invention;

5 a view of the brake pad assembly according to 4 from another angle;

6 a view of a guide with arranged therein brake pad assembly according to 4 and 5 ;

7 a perspective view of another brake pad assembly according to the invention;

8th a side view of the brake pad assembly 7 ;

9 another perspective view of the brake pad assembly 7 from another angle; and

10 a view accordingly 6 with the brake pad assembly according to 7 to 9 ,

In 1 is a disc brake according to the invention in a view in the direction of the axis of rotation of a brake disc 12 shown and generally with 10 designated. Here is a facility for leadership, hereinafter referred to as "leadership 14 "With a floating saddle 16 shown. In the lead 14 is a brake pad assembly 18 slidably received. This is in reception areas 20 . 22 via retaining tongues 24 . 26 displaced led. At the retaining tongues 24 . 26 are, as will be explained in detail below, spring arrangements 28 . 30 arranged.

2 and 3 show the area of a holding tongue 24 a brake pad carrier 32 in detail in perspective view or in sectional view. The retaining tongue 24 is of a material portion of the brake pad carrier 32 formed projecting from this side. The retaining tongue 24 has a groove-like depression 34 on, in which the formed of band-shaped spring steel spring arrangement 28 is included. More specifically, it is a base section 36 this spring arrangement 28 in the depression 34 added. From this base section 36 stretches out how to get in 2 and 3 detects, in each case a loop-shaped or loop-shaped spring clip 38 . 40 , This spring clip 38 . 40 extends initially starting from the base 36 linear in areas 42 . 44 so that the spring assembly 28 the retaining tongue 24 embraces. The spring clip is then on the base 36 opposite side in an S-shaped area 46 . 48 curved and enters a spanned this U-shaped area 50 . 52 above. From this spanning U-shaped area 50 . 52 then extends a substantially linearly shaped contact portion 54 . 56 with which the spring arrangement 28 at these sections 54 . 56 facing surfaces of components of the guide 14 under bias. The bias voltage is indicated by the force arrows F. From the amount of the biasing force F results in a frictional force that must be overcome to the brake pad carrier 32 relative to the leadership 14 to move permanently, with the two sections 54 and 56 relative to the leadership 14 slip.

In 3 one recognizes further that the retaining tongue 24 each corresponding to the gap s with play within the lead 14 are stored.

In operation, the spring assembly operates according to 1 to 4 as follows. Upon actuation of the brake, the brake pad carrier 32 together with the brake lining attached thereto via a known actuating mechanism, for example a hydraulically actuated piston, on the brake disc 12 to relocate. The case to be covered here way to achieve a braking effect, the so-called clearance, is relatively small.

After release of the brake, the brake pad carrier must be 32 again automatically move to its starting position to reduce the braking force as quickly as possible. To apply the restoring force is the spring assembly 28 , In a normal brake operation, the feed movement to the brake disc and the subsequent return movement under elastic deformation or relaxation of the loop-shaped or loop-shaped sections 38 and 40 , The two investment sections 54 and 56 remain in a normal brake operation due to the force acting by the biasing forces frictional force stable to the guide 14 ,

Is it during the life of the brake to a wear of the brake pad on the brake pad carrier 32 , so the brake pad assembly relative to the guide 14 be adjusted to compensate for this wear. Otherwise, the clearance between the brake disc and brake pad would grow, which adversely affects the response of the brake. According to the invention, this readjusting movement or compensation movement does not become permanent due to greater elastic deformation of the loop-shaped section 38 and 40 achieved, as is the case for example in the prior art. Rather, there is a relative movement between the spring assembly 28 and the leadership 14 by taking the two investment sections 54 and 56 in the lead 14 slippage overcoming the static friction forces. This effect results from the fact that in the context of a wear compensation first the elastic deformation of the two loop-shaped sections 38 and 40 is so great that it is a kind of "breakaway torque" in the area of the plant sections 54 and 56 comes, whereby the static friction forces are overcome. The looped sections 38 and 40 relax accordingly and assume their original shape. As a result, the brake pad assembly 18 , in particular the brake pad carrier 32 according to arrow P for wear compensation relative to the guide 14 permanently relocated.

It should be noted that the spring arrangement 29 may be formed rubber-coated, so as to form an electrochemical stress between the respective material pairings of leadership 14 , Spring arrangement 28 and brake pad carrier 32 to prevent. As a result, undesirable corrosion effects can be suppressed.

Furthermore, it should be noted that the spring arrangement 28 due to their shape fixed to the brake pad carrier 32 holds. It embraces this, so to speak, elastic and backlash-free, as in 3 is recognizable. The brake pad carrier 32 is floating under pretension in the lead, so to speak 14 recorded and will according to 3 spring-mounted upwards and downwards.

In operation, a Belagückstellung is basically conceivable, for example, if the relative displacement between the brake pad carrier 32 and leadership 14 as a result of a very intense braking in individual cases went too far. This Belagückstellung is analogous to the above description in terms of wear compensation, but in the opposite direction.

Another advantage of the invention is that, as can be seen in 2 and 3 can recognize the spring arrangement 28 can be made from a simple elongated spring steel strip, so that during production virtually no or only minimal waste is produced.

All in all This results in an extreme over the prior art advantageous operation in a simpler and cheaper Production. With such a spring arrangement leaves also the nowadays usual variety of parts with different brakes greatly reduced, in particular by standardizing the interfaces.

4 . 5 and 6 show a second embodiment of the invention in various views. The same reference numerals as in the description of the embodiment according to 1 to 3 used, but preceded by the number "1".

The brake pad carrier 132 has a brake pad on its front 160 on. He is laterally with holding tongues 124 . 126 Mistake. At the retaining tongue 126 is a spring arrangement 128 appropriate. This includes a base section 136 , starting from which two loop-shaped sections 138 and 140 extend. These two loop-shaped sections each go into a curved contact section 142 . 144 over, with which the brake pad carrier 132 floating in the guide, but is stored under spring preload. From the base section 136 Starting from a clamping tab also extends 162 holding the retaining tongue 126 engages the front side and so for a more secure hold of the spring assembly 128 at the retaining tongue 126 provides. One recognizes the embrace of this clamping plate 162 especially in 5 ,

The operation is similar, as already above for the first embodiment according to 1 to 3 described. The displacements of the brake pad assembly with the brake pad carrier 132 and the brake pad 160 in the context of egg ner normal brake operation without wear compensation are solely by elastic deformation of the loop-shaped sections 138 and 140 completed. There is no relative displacement between the plant sections 142 and 144 and the leadership 14 ,

But it comes to a wear on the brake pad 160 , so that a compensation for maintaining a constant clearance is required, the tension forces occurring in the elastic deformation are so high that it comes to breakaway torques at the abutment sections 142 . 144 comes and finally to a wear compensating relative movement between the plant sections 142 and 144 and the leadership 14 , In other words, the lining arrangement moves according to the wear.

In 6 can be seen as the brake pad assembly with the brake pad carrier 132 and the brake pad 160 in the lead 114 is installed, with the spring assembly 128 , similar to in 1 shown in the receiving section 120 supported.

In 7 to 10 one recognizes a further embodiment of the invention. Again, the same reference numerals as above are used, but preceded by the numeral "2".

The main difference between the embodiment according to 4 to 6 and the embodiment according to 7 to 10 is that the spring arrangement in the embodiment according to 7 to 10 only with a loop-shaped section 240 is provided, which in a curved or curved contact section 244 passes. At the other end of the base part 236 extends from this starting a retaining tongue of the brake pad carrier 232 encompassing hook element 270 that at its free end 272 is again folded over to the captive. It can also be seen that starting from the base section 236 the front of the retaining tongue 226 with a flat trained clamping strap 262 is provided.

The operation is again the same as described above. The displacement of the brake pad assembly according to 7 to 10 within the leadership 214 (please refer 10 ) takes place in the normal brake operation without wear compensation alone under elastic deformation of the loop-shaped portion 240 , which then provides relaxation for the restoring forces and return movement. In case of wear, there is a displacement movement between the spring assembly 228 and the leadership 214 ,

Also for the second and third embodiments according to the 4 to 10 apply the above-described advantages of a simple production, a reliable wear adjustment with constant restoring force and a low material scrap in the production.

Due to the loop-shaped sections, a reliable return movement can be ensured permanently, which in all embodiments brings with it the advantages of low residual grinding moments and thus ultimately lower wear on the one hand and reduced fuel consumption of the correspondingly equipped vehicle on the other hand. The embodiment with only a loop-shaped section according to 7 to 10 has the advantage of a more defined guidance of the brake pad assembly.

The The above-described embodiments all looked before that receiving areas are provided in the guide and that on the brake pad carriers each retaining tongues are provided, via which displaceable the brake pad assembly in the guide is guided. Alternatively, it is alike possible to attach the retaining tongues to the guide and receiving areas according to the brake pad carrier of Brake pad assembly, in which case the respective spring arrangement the retaining tongues of the guide are provided. At long last arises in this alternative embodiment same operation as above with respect to the Detail described embodiments explained.

in principle can be with the invention and unwanted noise at a shift of the brake pad assemblies in the housing prevent and achieve the advantages described above.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19650592 A1 [0002]
• - DE 3538320 A1 [0003]
• WO 03/027527 A1 [0004]

Claims (14)

Disc brake ( 10 ) for a motor vehicle, comprising a guide ( 14 ), in which at least one brake pad arrangement is guided such that it can be displaced in a brake-effective manner, wherein the brake pad arrangement has a brake pad carrier ( 32 ), on which a vehicle brake pad ( 60 ) fitted with a brake disc ( 12 ) is engageable to effect a braking action, wherein one of brake lining carrier components ( 32 ) and leadership ( 14 ) at least one retaining tongue ( 24 . 26 ) and the other component of brake pad carrier ( 32 ) and leadership ( 14 ) at least one receiving area ( 20 . 22 ), wherein the at least one retaining tongue ( 24 . 26 ) in the at least one receiving area ( 20 . 22 ) is guided, wherein at least one retaining tongue ( 24 . 26 ) a spring arrangement ( 28 . 30 ) is mounted, via which a restoring force due to an elastic deformation by braking effective deflection of the brake pad assembly can be applied to this, characterized in that the spring arrangement ( 28 . 30 ) at least one loop-shaped elastically deformable spring clip ( 38 . 40 ), over which the spring arrangement ( 28 . 30 ) under spring tension on the receiving area ( 20 . 22 ) is supported, wherein the spring preload is dimensioned such that the spring clip ( 38 . 40 ) in a pure brake operation without pad wear compensation while avoiding a relative displacement of the receiving area ( 20 . 22 ) and that the spring clip ( 38 . 40 ) in a brake operation with pad wear compensation for compensating the pad wear relative to the receiving area ( 20 . 22 ) relocated. Disc brake ( 14 ) according to claim 1, characterized in that the spring arrangement ( 28 . 30 ) at its associated retaining tongue ( 24 . 26 ) is locked. Disc brake ( 10 ) according to claim 1 or 2, characterized in that the retaining tongue ( 24 . 26 ) an undercut ( 34 ), at which the spring arrangement ( 28 ) is supported captively. Disc brake ( 10 ) according to one of the preceding claims, characterized in that the spring arrangement ( 28 . 30 ) a base section ( 36 ), which at its associated retaining tongue ( 24 ) lies flat and from which the starting at least one spring clip ( 38 . 40 ), preferably unwound to the base section ( 36 ) extends. Disc brake ( 10 ) according to one of the preceding claims, characterized in that the spring arrangement ( 28 ) two spring clips ( 38 . 40 ) extending from the base portion ( 36 ) on both sides of its associated retaining tongue ( 24 ). Disc brake ( 210 ) according to one of claims 1 to 4, characterized in that the spring arrangement ( 228 ) a spring clip ( 240 ) on one side of the base section ( 236 ) and a retaining tongue ( 226 ) at least partially embracing hook element ( 270 ) on the other side of the base section ( 236 ) having. Disc brake according to one of the preceding claims, characterized in that the spring arrangement ( 128 ) in addition to the at least one spring clip ( 138 . 140 ) at least one clamping tab ( 162 ), with which it at its associated retaining tongue ( 126 ), wherein preferably the clamping strap ( 162 ) the retaining tongue ( 126 ) surrounds. Disc brake according to one of the preceding claims, characterized in that the spring clip ( 38 . 40 ) flat on at least one corresponding surface of the receiving area ( 20 . 22 ) is applied under prestress. Disc brake according to one of claims 1 to 7, characterized in that the spring clip ( 138 . 140 ) a curved contact section ( 142 . 144 ), with which it bears against a corresponding surface of the receiving area. Disc brake ( 10 ) according to one of the preceding claims, characterized in that the spring clip ( 38 . 40 ) with its loop-shaped section ( 46 . 50 . 48 . 52 ) engages behind the associated retaining tongue. Disc brake ( 10 ) according to one of the preceding claims, characterized in that the spring arrangement ( 28 ) is made of a spring plate. Disc brake ( 10 ) according to one of the preceding claims, characterized in that the spring arrangement ( 28 ) is provided with an electrically insulating coating, in particular of a plastic material, preferably of a rubber material. Disc brake according to one of the preceding claims, characterized in that the spring arrangement ( 28 ) the brake pad assembly relative to the housing ( 14 ) in the radial direction with respect to the orientation of the brake disc ( 12 ). Brake pad arrangement for a disc brake ( 10 ) according to one of the preceding claims, wherein the brake pad assembly comprises a brake lining carrier ( 32 ), on which a vehicle brake pad ( 60 ) is mounted, wherein the brake pad carrier ( 32 ) at least one retaining tongue ( 24 . 26 ), with which it is guided in a receiving area of the guide is receivable, or has a receiving area with which it receives a retaining tongue of the guide, wherein at least one retaining tongue ( 24 . 26 ) a spring arrangement ( 28 . 30 ) is mounted, via which a restoring force due to an elastic deformation by braking effective deflection of the brake pad assembly can be applied to this, characterized in that the spring arrangement ( 28 . 30 ) at least one loop-shaped elastically deformable spring clip ( 38 . 40 ), over which the spring arrangement ( 28 . 30 ) is supported under spring bias on the receiving area, wherein the spring preload is dimensioned such that the spring clip ( 38 . 40 ) in a pure brake operation without pad wear compensation while avoiding a relative displacement rests against the receiving area and that the spring clip ( 38 . 40 ) is displaced relative to the receiving area in a brake operation with pad wear compensation to compensate for the pad wear.