Friction lining of drum brake

Abstract

To provide a friction material / friction lining having improved friction characteristics as much as possible and at the same time sufficient or improved flowability.SOLUTION: A friction lining mixture manufactures a brake lining for a drum brake. The friction lining mixture comprises: at least 15 mass% of metal fibers; at least 7 mass% of glass fibers in a form of a glass fiber bundle; at least 4 mass% resin; and at least 2 mass% of friction powder.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This application claims the benefit of Paris Convention priority of German Patent Application No. 10 2024 104 119.6, filed February 14, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a friction lining mixture and a friction lining made from said friction lining mixture, adapted in particular for use in drum brakes.Furthermore, the present invention relates to a method for making such a friction lining and its use. [Background technology]

[0003] Drum brakes have a closed, cylindrical structure. The most important components of a drum brake are a cylindrical brake drum, brake shoes, and a wheel cylinder. During the braking process, the wheel cylinder presses against the brake shoes, which are positioned in place, and thus presses the brake shoes against the brake drum, thereby braking the brake drum.

[0004] The brake shoe primarily serves as a support for the friction material or for one or more friction linings. Since the brake drum, on whose inside the brake shoe (lining support plate with friction lining) is pressed, is cylindrical, the lining support plate, and especially the friction lining, must ideally have a shape that contacts the inner wall of the brake drum, i.e., that accommodates (fits) the shape of the inner wall. Therefore, the friction lining or friction material for drum brakes must have the necessary flowability to assume the required crescent shape during the molding process (when the friction material / friction lining mixture is pressed).

[0005] Although the frictional properties of drum brake linings are often inferior to those of disc brake linings, drum brakes also have some advantages over disc brakes, such as the brakes being encapsulated, which protects them from contamination, releases less brake debris into the environment, and has a desirable long lifespan.

[0006] A wide variety of friction linings are known in the prior art which can be used for disc and / or drum brake linings for PKWs (Personnenkraftwagen: passenger cars) or LKWs (Lastkraftwagen: trucks) and as clutch linings. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] DE-OS 2 023 227 [Patent Document 2] DE 10 2021 204 132 A1 [Patent Document 3] EP 0 050 377 B1 [Patent Document 4] EP 2 270 353 A2 Summary of the Invention [Problem to be solved by the invention]

[0008] DE-OS 2 023 227 describes the use of glass fibres in brake shoe linings with curved braking surfaces.

[0009] DE 10 2021 204 132 A1 relates to a drum brake for a KFZ in which the brake lining contains steel wool.

[0010] The subject of EP 0 050 377 B1 is an asbestos-free friction material containing aramid, steel, and mineral fibers. Glass fibers, among other different materials, can also be used as mineral fibers. The elasticity of the resulting friction lining can be adjusted by changing the binder used.

[0011] EP 2 270 353 A2 describes a friction lining mixture for brake and clutch linings, which mixture may contain a number of components, inter alia, resin, steel wool, a small amount of glass fibers, and also a small amount of friction particles, and to which metallic tin is added to improve its performance. Its field of use is brake and clutch linings.

[0012] The above documents describe only a small part of the prior art in the field of friction lining mixtures and friction linings for disc and drum brake linings and for clutch linings.

[0013] It can be seen in principle that friction linings for disc and drum brakes have different compositions: both types contain steel wool or steel fibers and / or metal fibers, such as copper or zinc fibers, for reinforcement (increasing the internal strength of the friction lining).

[0014] Disc brake friction linings (also called disc brake linings) typically contain 20-30% by weight of steel fibers for reinforcement, but do not contain much more than approximately 5% by weight of resin. For mass-produced disc brake linings, glass fiber bundles are typically not used as a component of the friction lining.

[0015] Friction linings for drum brake linings often contain 5 to 10% by weight of glass fiber bundles for reinforcement and significantly more resin (approximately 10 to 15% by weight). Brake linings for drum brakes also exist in which the friction lining contains steel wool to improve friction properties. In these cases, these friction linings also contain flake graphite and / or layered silicates (e.g., vermiculite) and an increased amount of resin to ensure the flowability of the friction lining mass so that the formed friction lining takes on the crescent shape (sickle shape) required for drum brake linings.

[0016] The flowability of the friction material can be affected in principle by different types of binder resins, by changing (varying) the binder resin content, and even by solid materials that are smooth and have good lubricating properties. Such materials include, for example, glass fiber bundles, layered silicates, and flake graphite. However, the use of, for example, layered silicates or flake graphite can result in manufacturing difficulties and long pressing times.

[0017] Under these circumstances, the object of the present invention is to provide a friction material / friction lining for drum brakes (or a brake lining consisting of a lining carrier plate and a friction lining) that has improved friction characteristics (e.g., friction value) and at the same time sufficient or improved flowability so that the formed friction lining stably and crack-free assumes the required crescent shape and contacts the brake drum fully (over the entire surface) and closely. To ensure the simplest possible manufacture of such a drum brake lining, it is desirable that the friction lining can be pressed directly onto the lining carrier plate, preferably without adhesive and without an intermediate layer. The friction lining is preferably bonded to the lining carrier plate by the friction material itself. [Means for solving the problem]

[0018] According to a first aspect of the present invention, there is provided a friction lining mixture for manufacturing a brake lining for a drum brake, said friction lining mixture comprising: at least 15% by weight of metal fibers, preferably steel fibers, especially steel wool; at least 7% by weight of glass fibers in the form of glass fiber bundles; at least 4% by weight of resin, and At least 2% by weight of friction powder (Reibkoerner), preferably with a Mohs hardness of 9 or more Includes. According to a second aspect of the present invention, there is provided a friction lining for a drum brake made from the friction lining mixture of the present invention. According to a third aspect of the present invention, there is provided a drum brake lining comprising a lining support plate having a curved surface on which a friction lining of the present invention is disposed. According to a fourth aspect of the present invention, A method for manufacturing the drum brake lining of the present invention is provided. The method comprises the following steps: Providing a lining support plate with a curved surface; Providing friction lining mixtures; - filling the friction lining mixture into a mold, with the proviso that during and after filling the friction lining mixture no separate steps are carried out for the dispersion of the friction lining mixture in the mold; pressing the lining support plate against the friction lining mixture in the mold at elevated temperature and pressure; and Hardening the resulting friction lining Includes. According to a fifth aspect of the present invention, there is provided the use of a friction lining mix according to the present invention for producing a friction lining according to the present invention. According to a sixth aspect of the present invention, there is provided the use of a friction lining according to the present invention for manufacturing a drum brake lining according to the present invention. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an example of a glass fiber bundle that can be used in accordance with the present invention. [Figure 2] An example of a metal fiber that can be used in accordance with the present invention in the form of steel wool. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a preferred embodiment of the present invention will be described. (Mode 1) See the first aspect of the present invention above. (Mode 2) In the friction lining mixture according to Mode 1, the friction lining mixture is 15 to 20 mass % metal fibers; 7 to 10 mass% of glass fiber bundles; 4 to 9% by weight of a resin, and 2 to 10% by mass of friction powder Contains is preferred. (Configuration 3) In the friction lining mixture according to configuration 1 or 2, The friction lining mixture additionally contains sulfides of tin, antimony and bismuth, preferably in an amount of 2% by weight or more. is preferred. (Configuration 4) In the friction lining mixture according to any one of Configurations 1 to 3, The friction powder is composed of Al2O3, SiC, B4C or Si3N4 or mixtures thereof. is preferred. (Mode 5) In the friction lining mixture according to any one of modes 1 to 4, The friction lining mixture is free from layered silicates and flake graphite. is preferred. (Mode 6) In the friction lining mixture according to any one of modes 1 to 5, The metal fibers are configured as steel wool. is preferred. (Mode 7) See the second aspect of the present invention above. (Embodiment 8) The friction lining according to embodiment 7, The friction lining has a friction value μ of at least 0.3, in particular 0.4 to 0.5. is preferred. (Mode 9) See the third aspect of the present invention above. (Embodiment 10) In the drum brake lining according to embodiment 9, The friction material is pressed directly onto the lining support plate for bonding, and no adhesive or intermediate layer is provided between the support plate and the friction material. is preferred. (Embodiment 11) In the drum brake lining according to embodiment 9 or 10, The friction material is connected to the lining support plate without any separate mechanical fastening aids, and no screws, bolts or rivets are used. is preferred. (Embodiment 12) In the drum brake lining according to any one of embodiments 9 to 11, the lining support plate has projections and / or recesses, the recesses being filled with a friction lining, the projections penetrating into the friction lining to a point below the wear limit; is preferred. (Embodiment 13) In the drum brake lining according to embodiment 12, The recesses are flat and arranged in a grid on the surface of the lining support plate. is preferred. (Embodiment 14) In the drum brake lining according to embodiment 12 or 13, The protrusions are configured as pins and are preferably arranged in a plurality of rows, in particular in planar recesses. is preferred. (Mode 15) See the fourth aspect of the present invention above. (Embodiment 16) In the method according to embodiment 15, During and after filling the mold with the friction lining mixture, no separate process is carried out for dispersing the friction lining mixture in the mold. is preferred. (Mode 17) See the fifth aspect of the present invention above. (Mode 18) See the sixth aspect of the present invention above.

[0021] The above-mentioned object, together with various partial aspects thereof, is achieved by a friction lining mixture according to the first aspect and a friction lining for a drum brake lining manufactured from the mixture. Preferred embodiments of the invention are defined in the dependent claims.

[0022] The present invention therefore relates to a friction lining mixture which is characterized by a special combination of metal fibers, glass fiber bundles, resin and friction powder.

[0023] The friction lining mixture preferably comprises at least 15% by weight of metal fibers, especially steel fibers, more preferably in the form of steel wool, at least 7% by weight of glass fibers added to the friction lining mixture in the form of glass fiber bundles, at least 4% by weight of binder resin and at least 2% by weight of friction powder.

[0024] A particularly preferred friction lining mixture comprises the following components: 15 to 20% by weight of metal fibers, preferably steel fibers, in particular steel wool, 7-10% by mass of glass fiber in the form of glass fiber bundles 4 to 9% by mass of binder resin, and ·Friction powder 2~10% by mass.

[0025] Further preferred embodiments of the invention relate to friction lining mixtures which, in addition to the above components, contain heavy metal sulfides from the fourth or fifth main group (group of main group elements) of the periodic table, such as tin, antimony and bismuth, in an amount of 2% by weight or more.

[0026] Furthermore, the friction lining mixture of the present invention is preferably substantially free of layered silicates and flake graphite or contains less than 2% by weight of such materials.

[0027] The weight percentages used in this application are each relative to the weight of the finished friction lining mixture.

[0028] The friction powders used according to the invention are preferably friction powders with a Mohs hardness of 9 or higher. Examples include: SiC (Mohs hardness 9.5-9.75), Al2O3 (Mohs hardness 9), B4C (Mohs hardness 9.3) and various modifications of Si3N4 with a Mohs hardness of 9. These particles are preferably used with a particle size having a diameter d50 of 3 to 150 μm. The particle size can be determined, for example, by analytical equipment available from the French company CILAS or the German company Anton Paar GmbH.

[0029] The metal fibers are preferably steel fibers, stainless steel fibers, copper fibers, brass fibers, or bronze fibers. The fibers are preferably configured as very short fibers with a length of 0.1 mm to 0.3 mm or medium fibers with a length of 0.3 mm to 0.5 mm, for example in the form of slivers, or as wool in the form of longer fibers or threads with a length of more than 0.5 mm. The metal fibers preferably have a diameter of 0.05 to 0.2 mm. For example, copper wool or brass sliver can be used as the metal fibers.

[0030] While glass fibers with completely random orientations are often used in friction linings to increase strength or reinforcement, glass fiber bundles are used in the present invention. In this case, a large number of individual short glass fibers with the same orientation are bundled together to form bundles. Glass fiber bundles increase the flowability of the friction lining mixture of the present invention. For this purpose, fibers made of quartz glass, borosilicate glass, aluminosilicate glass, magnesium aluminosilicate glass, and / or calcium aluminosilicate glass are preferably used. The glass fibers preferably have a length of 1 to 5 mm. Particularly preferably, the fibers have a length of 3 mm. The fibers preferably have a diameter of 0.5 to 50 micrometers. Glass fiber bundles are produced, for example, from a glass melt by extruding the melt through spinning nozzles, for example made of tungsten. The number of nozzles determines the thickness or width of the bundle. In this case, the nozzles are arranged side by side in a row. This results in smooth platelets. The glass fiber bundles are, for example, 0.25 to 2 mm wide. The twisted bundles are then cut into lengths of, for example, 3 mm. Furthermore, the bundles can be provided with a glue, which, among other things, reduces their tendency to crumble. The glue used varies depending on the manufacturer and consists of a coating and / or adhesive.

[0031] The resin used in accordance with the present invention can be based on natural or synthetic resins. Phenolic resins are preferred. Organic synthetic resins, such as cresol, alkyl, CSNL, epoxide, NBR, resorcinol, aryl, SBR, and CR resins, can also be used. Non-organic synthetic resins, such as boron, phosphorus, silicone, and chromium resins, can also be used.

[0032] Heavy metal sulfides can be included in the friction lining mixture, preferably in amounts of 2 to 10% by weight. These sulfides are high-temperature lubricants and reduce thermal wear. They also contribute to achieving good disc crack resistance. Furthermore, they smooth out the friction values ​​(leading to a generally constant value) and are an effective means of combating pressure and speed fading.

[0033] Further components, preferably 15 to 30% by mass of coke and graphite, can be included in the friction lining mixture. Coke stabilizes the performance of the friction lining. Graphite contributes to lubrication and wear reduction. For this purpose, powdered graphite (Mahlgraphite) and / or electrode graphite (Electrodengraphite) can be used.

[0034] Preferably, 1 to 10% by weight of rubber can also be included in the friction lining mixture, which results in improved vibration damping or noise minimization and improved flexibility of the friction lining.

[0035] Furthermore, minerals, preferably 10 to 40% by mass, can be contained in the friction lining mixture. Advantageously, cost-effective fillers such as chalk, barite, magnesium oxide, slate powder, and kaolin are used. These fillers act to maintain the friction value and reduce wear.

[0036] Particularly advantageously, the friction lining mixture of the present invention can be pressed (or pressed) directly onto the lining support plate, resulting in a sufficiently stable (strong) bond between the friction lining and the lining support plate. The use of adhesives or intermediate layers on the lining support plate can be eliminated according to the present invention. Separate mechanical connecting aids, such as screws, bolts or rivets, connected to the lining support plate are not necessary for a sufficiently stable (strong) bond between the friction lining and the lining support plate.

[0037] Friction linings made from the friction material of the present invention have a friction value μ of at least 0.3, especially 0.4 to 0.5, for sliding friction. The friction value μ is also called the coefficient of friction or the friction number. The determination of the friction value is carried out, for example, as described in the Wikipedia article "Reibungskoeffizient" (Coefficient of Friction), in the paragraph "Calculation of Frictional Forces."

[0038] As already mentioned, according to the present invention, the friction material can be pressed (or press-bonded) directly onto the lining support plate under elevated pressure and elevated temperature without adhesive and without an intermediate layer, thus readily obtaining a friction lining or brake lining / brake shoe for a drum brake.

[0039] To further increase the stability of the curved drum brake lining, the support plate / lining support plate can have one or more projections and / or recesses that do not receive the friction material but penetrate into the friction material layer and thus are suitable for receiving the tangential forces transmitted through the friction lining in the operating mode. In this case, the projections of the support plate, which are curved according to the radius of the brake drum, penetrate into the friction material / friction lining to a position below (where the wear limit is not reached) a predetermined wear limit.

[0040] A preferred embodiment of the support plate according to the invention is one in which the support plate (on the side facing the friction lining) has a plurality of flat recesses arranged in a grid.Furthermore, embodiments of the lining support plate in which the support plate has a plurality of projections configured as pins are preferred, in particular embodiments in which the support plate has a plurality of rows of pins, in which case the pins are arranged in several or all of the existing flat recesses.

[0041] The present invention also provides a method for producing the drum brake lining of the present invention, which comprises a lining support plate having a curved surface and a friction lining disposed on that surface. To this end, a lining support plate (having a surface curved according to the radius of the brake drum, so that the friction lining subsequently fits snugly against the brake drum) and a flowable friction lining mixture of the present invention are provided. By flowable friction lining mixture, we mean that the mixture is flowable under the conditions for producing the friction lining, i.e., under the temperature and pressure used, and can be applied to fit snugly to the surface of the support plate and conform to a predefined shape. Furthermore, after filling the mold with the friction lining mixture, no special (separate) treatment is required for the dispersion of the mixture in the mold. After filling the mold with the friction lining mixture, the support plate is pressed directly against the friction lining mixture in the mold under elevated temperature and elevated pressure. In this case, the temperature is 140 to 180°C, and a pressure of 30 to 60 N / mm is applied for 2 to 5 minutes. 2 Preferably, a pressure of 0.15 MPa is used. The friction lining is then hardened.

[0042] According to the invention, the friction lining so obtained can be further treated in the usual way, for example by mechanical working (for example polishing), after removal from the mould.

[0043] Finally, the present invention comprises the use of the friction lining mixture of the present invention for the manufacture of drum brake linings and the use of friction linings obtained from said mixture.

[0044] In summary, it can be seen that the friction material according to the present invention is different from the materials used in disc brake linings and also from the materials used in drum brake linings.

[0045] Examples or differences with respect to the prior art include the absence of layered silicates and flake graphite, as well as resin amounts that are very high for disc brake linings but rather low for drum brake linings. Furthermore, in prior art drum brake linings, neither heavy metal sulfides nor friction powders with a Mohs hardness of less than 9 are used. Finally, the combination of glass fiber bundles and metal fibers, especially steel wool, in amounts according to the invention is found, which is not present in prior art brake linings.

[0046] The present invention can be described as follows: [Appendix 1] A friction lining mixture for manufacturing a brake lining for a drum brake, the friction lining mixture comprising: at least 15% by weight of metal fibers, preferably steel fibers, especially steel wool; at least 7% by weight of glass fibers in the form of glass fiber bundles; at least 4% by weight of resin, and At least 2% by weight of friction powder (Reibkoerner), preferably with a Mohs hardness of 9 or more Includes. [Appendix 2] In the above-mentioned friction lining mixture, particularly as described in Appendix 1, the friction lining mixture is 15 to 20 mass % metal fibers; 7 to 10 mass% of glass fiber bundles; 4 to 9% by weight of a resin, and 2 to 10% by mass of friction powder Includes. [Appendix 3] In the above-mentioned friction lining mixture, in particular as described in appendix 1 or 2, The friction lining mixture additionally contains sulfides of tin, antimony and bismuth, preferably in an amount of 2% by weight or more. [Appendix 4] In the above-mentioned friction lining mixture, in particular, as described in any one of Appendices 1 to 3, The friction powder is composed of Al2O3, SiC, B4C or Si3N4 or mixtures thereof. [Appendix 5] In the above-mentioned friction lining mixture, in particular, as described in any one of Appendices 1 to 4, The friction lining mixture does not contain layered silicate and flake graphite. [Appendix 6] In the above-mentioned friction lining mixture, in particular, as described in any one of Appendices 1 to 5, The metal fibers are configured as steel wool. [Appendix 7] A friction lining for a drum brake, manufactured from the friction lining mixture described above, in particular any one of Appendices 1 to 6. [Appendix 8] In the friction lining described above, particularly in Appendix 7, The friction lining has a friction value μ of at least 0.3, in particular between 0.4 and 0.5. [Appendix 9] A drum brake lining comprising a lining support plate having a curved surface on which the friction lining described above, in particular as described in appendix 7 or 8, is arranged. [Appendix 10] In the drum brake lining described above, particularly in Appendix 9, For bonding, the friction material is pressed (or press-bonded) directly onto the lining support plate, and no adhesive or intermediate layer is disposed between the support plate and the friction material. [Appendix 11] In the drum brake lining described above, particularly as described in Appendix 9 or 10, The friction material is connected to the lining support plate without separate mechanical fixing aids and no screws, bolts or rivets are used. [Appendix 12] In the drum brake lining described above, particularly in any one of Appendices 9 to 11, The lining carrier plate has projections and / or recesses, the recesses being filled with a friction lining, the projections penetrating into the friction lining to a point below the wear limit. [Appendix 13] In the drum brake lining described above, particularly in Appendix 12, The recesses are of flat design and are arranged in a grid on the surface of the lining support plate. [Appendix 14] In the drum brake lining described above, particularly as described in appendix 12 or 13, The protrusions are configured as pins and are preferably arranged in rows, in particular in areal recesses. [Appendix 15] A method for manufacturing a drum brake lining as described above, particularly as described in any one of Appendices 9 to 14, The method comprises the following steps: Providing a lining support plate with a curved surface; Providing friction lining mixtures; - filling the friction lining mixture into a mold, with the proviso that during and after filling the friction lining mixture no separate steps are carried out for the dispersion of the friction lining mixture in the mold; pressing the lining support plate against the friction lining mixture in the mold at elevated temperature and pressure; and Hardening the resulting friction lining Includes. [Appendix 16] In the method described above, particularly in Appendix 15, During and after filling the friction lining mixture into the mold, no separate process is carried out for the dispersion of the friction lining mixture in the mold. [Appendix 17] Use of the friction lining mixture described above, in particular any of Appendices 1 to 6, for producing a friction lining described above, in particular any of Appendices 7 or 8. [Appendix 18] Use of the friction lining as described above, particularly as described in Appendix 7 or 8, for manufacturing a drum brake lining as described above, particularly as described in any one of Appendixes 9 to 14.

[0047] Within the scope of the entire disclosure of the present invention (including the claims and drawings), modifications and adjustments of the embodiments are possible based on the basic technical concept thereof. Furthermore, within the scope of the entire disclosure of the present invention, various combinations and selections (including "non-selection") of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible. In other words, the present invention naturally includes various modifications and alterations that would be possible by a person skilled in the art in accordance with the entire disclosure, including the claims and drawings, and the technical concept of the present invention. In particular, with regard to the numerical ranges described herein, any numerical value or subrange included within the range should be construed as being specifically described, even if not otherwise specified.

[0048] Furthermore, the entire contents of each of the above references are incorporated herein by reference.

Claims

1. 1. A friction lining mix for manufacturing a brake lining for a drum brake, comprising: at least 15% by weight of metal fibers, preferably steel fibers, in particular steel wool; at least 7% by weight of glass fibers in the form of glass fiber bundles; at least 4% by weight of resin, and At least 2% by weight of friction powder, preferably having a Mohs hardness of 9 or more 1. A friction lining mixture comprising:

2. 2. The friction lining mixture of claim 1, 15 to 20% by mass of metal fibers; 7 to 10 mass% of glass fiber bundles; 4 to 9% by weight of a resin, and 2 to 10% by weight of friction powder Contains Friction lining compound characterized by:

3. 3. The friction lining mixture according to claim 1 or 2, The friction lining mixture additionally contains sulfides of tin, antimony and bismuth, preferably in an amount of 2% by weight or more. Friction lining compound characterized by:

4. 4. The friction lining mixture according to claim 1, The friction powder is Al ２ O ３ , SiC, B ４ C or Si ３ N ４ or a mixture thereof Friction lining compound characterized by:

5. Friction lining mixture according to any one of claims 1 to 4, The friction lining mixture is free from layered silicates and flake graphite. Friction lining compound characterized by:

6. 6. The friction lining mixture according to claim 1, The metal fibers are configured as steel wool. Friction lining compound characterized by:

7. Friction linings for drum brakes, manufactured from the friction lining mixture according to any one of claims 1 to 6.

8. 8. The friction lining according to claim 7, The friction lining has a friction value μ of at least 0.3, in particular 0.4 to 0.

5. Friction lining characterized by:

9. A drum brake lining comprising a lining support plate having a curved surface on which the friction lining according to claim 7 or 8 is disposed.

10. 10. The drum brake lining according to claim 9, The friction material is pressed directly onto the lining support plate for bonding, and no adhesive or intermediate layer is disposed between the support plate and the friction material. Drum brake linings characterized by:

11. 11. The drum brake lining according to claim 9 or 10, The friction material is connected to the lining support plate without any separate mechanical fastening aids, and no screws, bolts or rivets are used. Drum brake linings characterized by:

12. The drum brake lining according to any one of claims 9 to 11, The lining support plate has a protrusion and / or a recess, the recess is filled with a friction lining, and the protrusion penetrates into the friction lining to a position lower than the wear limit. Drum brake linings characterized by:

13. 13. The drum brake lining according to claim 12, The recesses are flat and arranged in a grid pattern on the surface of the lining support plate. Drum brake linings characterized by:

14. 14. The drum brake lining according to claim 12 or 13, The protrusions are configured as pins and are preferably arranged in a plurality of rows, in particular in planar recesses. Drum brake linings characterized by:

15. A method for manufacturing a drum brake lining according to any one of claims 9 to 14, The method comprises the following steps: - providing a lining support plate with a curved surface; - providing a friction lining mixture; - filling the friction lining mixture into a mold, with the proviso that during and after filling the friction lining mixture no separate steps are carried out for the dispersion of the friction lining mixture in the mold; - forcing the lining support plate against the friction lining mixture in the mold under elevated temperature and elevated pressure; and Hardening the resulting friction lining Contains A method characterized by:

16. 16. The method of claim 15, During and after filling the mold with the friction lining mixture, no separate process is carried out for dispersing the friction lining mixture in the mold. A method characterized by:

17. Use of a friction lining mixture according to any one of claims 1 to 6 for producing a friction lining according to claim 7 or 8.

18. Use of a friction lining according to claim 7 or 8 for manufacturing a drum brake lining according to any one of claims 9 to 14.

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