BRAKE MODULE FOR A DRIVE SYSTEM, DRIVE SYSTEM AND MANUFACTURING METHOD FOR A BRAKE MODULE

Description

[0001] The invention relates to a brake module for a drive system, in particular for doors, comprising at least one thrust washer and at least one brake disc, wherein the at least one thrust washer and the at least one brake disc each have at least one friction surface that rubs against one another during braking operation. The invention also relates to a drive system, in particular for doors, comprising such a brake module. The invention further relates to a manufacturing method for a brake module of the above-mentioned type.

[0002] EP 1 664 470 B1 discloses a drive system for adjustment devices in motor vehicles. The drive system comprises a housing in which a drive element of the adjustment device, a disc-rotor motor with an armature disk, and an epicyclic gearing are arranged. The epicyclic gearing has a ring gear fixed to the housing with internal teeth, an output ring gear connected to the drive element of the adjustment device with internal teeth, and a radially flexible ring whose external teeth partially mesh with the internal teeth of the ring gear fixed to the housing and the output ring gear, and whose inner circumferential surface rolls on rollers. The output ring gear can be connected to a wrap spring brake, which increases the self-locking of the drive system and, for example, in the case of a window lifter, prevents unauthorized access to the vehicle interior by pushing down the window pane.

[0003] US 2013 / 0169087 A1 discloses a drive system for setting a movable panel of a vehicle in motion. In one embodiment, the drive system comprises a mechanical brake module having a tubular brake shaft and a coil spring arranged coaxially therein.

[0004] In the prior art, such drive systems are used primarily for the electromechanical opening and closing of doors, such as vehicle doors. The drive system can assist with manual opening, holding open, and closing of the door, and / or open and close the door independently. The power of an electric motor is transmitted to the door via a threaded spindle, for example, in a linear drive.

[0005] The brake module serves several functions. Firstly, it allows a vehicle's heavy tailgate to be held in any angular position, and secondly, it allows for a more smooth movement of the drive system. Furthermore, damage to a tailgate, for example, caused by excessive acceleration forces (especially from the user's hand force and the weight of the tailgate) during closing can be prevented by counteracting the braking force or the resulting torque.

[0006] The level of braking force can be determined in particular by the choice of material and / or number of friction partners, their geometry and, if necessary, by the choice of spring force of a spring that presses the thrust washer(s) against a brake disc.

[0007] Typically, the brake disc and the thrust washer(s) rotate relative to each other during braking. Common materials for the friction partners are sintered steel for the brake disc and nitrided chromium steel for the thrust washer. US 4 828 089 A describes a brake with a friction material made of pyrolytic carbon that is directly cooled by a liquid. JP S63 92840 A discloses a liquid-cooled brake disc.

[0008] The problem with generic brake modules is that the braking force is not constant over the service life of the brake modules and is also temperature-dependent.

[0009] The object of the invention is therefore to provide a cost-effective brake module for a drive system and a simple manufacturing method therefor, which provides a predictable braking force for the drive system and increases the service life of the drive system.

[0010] The subject matter of the present invention provides a brake module for a drive system, which solves this problem according to the features of claim 1. The problem is also solved by a drive system according to the features of claim 8 and a method according to the features of claim 9. Advantageous embodiments emerge from the dependent claims.

[0011] A brake module according to the invention for a drive system, in particular for doors, comprises at least one thrust disc and at least one brake disc, wherein the at least one thrust disc and the at least one brake disc each have at least one friction surface which rub against one another during braking operation.

[0012] The term "door" in the sense of the invention refers to a component for at least partially closing an opening in a structure, a device, or a vehicle. In particular, the "door" can be a vehicle door, for example, an access door for passengers of the vehicle, a hood, a luggage compartment lid, a cargo door, or a tailgate. A "vehicle" in the sense of the invention can be, for example, a land vehicle, a watercraft, or an aircraft, in particular an automobile. The brake module according to the invention is particularly suitable for a drive module for vehicle doors because, for example, for reasons of operational safety, a constant and predictable braking force is particularly important. In addition, drive systems for vehicle doors are often installed in such a way that they are difficult to replace, making a long service life particularly important.

[0013] At least one of the friction surfaces of the brake disc is formed by a friction layer to protect the brake disc and / or thrust washer from wear, wherein at least the friction layer comprises fibers and carbon, namely a carbon fiber fabric. This allows for a more constant braking force over the service life of the brake module, a lower temperature dependence of the braking force, and a longer service life of the brake module. Therefore, the braking force can be better adapted to the respective application and significantly less tolerance compensation is necessary. In the case of use for a vehicle tailgate, for example, this enables a lower braking force for medium temperatures of the braking system (approx. 20 °C) and thus easier operation from any starting position to any other end position of the door, i.e. in particular opening or closing the tailgate.The end position can be any intermediate position between a maximum opening position and a closing position. At the same time, functionality is not restricted at higher temperatures or at the beginning of the drive system's use. In particular, the drive system becomes more reliable and smoother over its service life and across changing operating parameters (such as the temperature of the brake module), because a smaller safety tolerance can be designed between a minimum braking force to hold the door in any intermediate position and a manual force required to change the position.

[0014] The more consistent and predictable braking force compared to a sintered brake disc can be partially explained by the more uniform surface of a brake disc according to the invention. Sintered brake discs initially have rounded edge areas due to the sintering process, thus reducing the effective friction surface. A brake disc with a friction layer according to the invention to protect the brake disc from wear, on the other hand, has a flatter friction surface from the outset, and the effective friction surface does not change during operation of the brake module.

[0015] Further embodiments are described by way of example with reference to friction layers that form friction surfaces of the brake disc. Within the scope of the invention, these embodiments can also be applied to friction layers that form friction surfaces of the thrust washer.

[0016] Preferably, each friction surface of the brake disc is formed by a friction layer according to the invention. This makes the aforementioned effects of the friction layers particularly noticeable.

[0017] A part of the brake disc, such as one or more layers of the brake disc, is formed by the friction layer. The friction layer of the brake disc can therefore form one or more surface layers (e.g., friction layers) of the brake disc.

[0018] The friction layer comprises carbon fibers, namely a carbon fiber fabric. Carbon fibers, especially in a carbon fiber fabric, can withstand very high mechanical loads while remaining lightweight, especially when a large number of fibers are combined into a filament yarn. This achieves high reliability of the braking module while maintaining low weight.

[0019] The friction layer can comprise a fiber-reinforced plastic, preferably glass fiber-reinforced and / or carbon fiber-reinforced. In the form of a fiber-reinforced plastic, the superior mechanical properties of the fibers can be advantageously combined with the ease of processing of a plastic, resulting in a reliable, lightweight, and cost-effective brake module.

[0020] The friction layer can comprise an amorphous carbon layer, preferably containing metals and / or hydrogen. Amorphous carbon layers are characterized by high wear resistance. By doping hydrogen-containing amorphous carbon layers (aC:H) with metals, a composite of an aC:H matrix and metal carbides is formed. Layers made of this material exhibit high wear resistance, low friction coefficients, and improved adhesion between the layers. By varying the metal content, the material properties can be significantly influenced and thus adapted to the requirements of the drive system.

[0021] The brake module can comprise a spring that presses the brake disc against the at least one thrust washer using a spring force. The spring is preferably a wave spring, thereby achieving a uniform spring force and stabilizing the brake module. The spring can be arranged on a side of a thrust washer opposite the brake disc and press the thrust washer against the brake disc.

[0022] The brake module can comprise a thrust washer on each of two opposite sides of the brake disc, with the brake disc comprising a friction surface facing each of the thrust washers, each with a friction layer according to the invention. By using two thrust washers on both sides of the brake disc, a longer service life and higher braking force can be achieved without significantly increasing the dimensions of the brake module.

[0023] The brake disc comprises a carrier, made in particular of plastic for reasons of weight, cost, and stability, and at least one friction layer connected to the carrier, preferably two friction layers connected to the carrier on opposite sides of the carrier. According to the invention, the brake disc comprises multiple layers, which allows better overall properties of the brake disc to be achieved. The carrier can, for example, be less or more elastic than a brake disc consisting entirely of a friction layer (depending on the requirements of the usage specifications and the drive system in which the brake disc is used). Furthermore, the thermal expansion behavior of the brake disc can be better matched to the thermal expansion behavior of the thrust washer(s) when using two or more different materials, thus reducing the temperature dependence of the braking torque.Furthermore, the carrier can be made of a cost-effective material, such as plastic, which can reduce the overall cost of the brake disc.

[0024] The at least one friction layer can be firmly bonded to the carrier, preferably with a partially elastic adhesive. A firmly bonded connection, for example, with an adhesive or by coating the carrier with an amorphous carbon layer, ensures a particularly long-term stable and reliable connection between the friction layer and the carrier. The partially elastic adhesive can, for example, compensate for different thermal expansion coefficients of the friction layer(s) and the carrier. Furthermore, the partially elastic adhesive allows for improved vibration damping.

[0025] The at least one thrust washer is made of steel, namely, according to the invention, non-nitrided chromium-5 steel. It has been found that although a thrust washer made of non-nitrided chromium-5 steel has a shorter service life than a thrust washer made of nitrided chromium-5 steel, the vibration and noise generated during friction with a brake disc made of fiber-reinforced plastic are significantly reduced compared to nitrided chromium-5 steel. Such a brake module according to the invention with thrust washer(s) made of non-nitrided chromium-5 steel nevertheless has an overall comparable or even longer service life than a prior art brake module.

[0026] The brake disc can be annular and in particular have a central recess, wherein the central recess is preferably approximately circular, in particular with at least two tooth sections separated from one another by a number of, for example, one, two, three, four, five, six or seven, recesses, wherein the tooth sections preferably comprise radially inwardly projecting teeth. Such a configuration allows a more flexible connection of the brake disc, for example to a drive shaft, in particular a threaded spindle, of the drive system. Tilting of the brake disc and the spindle nut is thus unlikely. This also makes it easier to install the brake module late in the production process of a drive system and to avoid vibration damage during assembly or to remove it if the brake module is defective.An approximately circular cross-section of the recess can, for example, mean that the cross-section is circular except for the radially inwardly projecting tooth sections. The recesses are advantageously evenly distributed around the recess in the circumferential direction of the brake disc, i.e., at a constant angular distance from one another, to ensure uniform loading of the brake disc and thus a long service life.

[0027] The brake disc and / or thrust washer can have a number of recesses in a friction surface for accommodating a lubricant. The recesses can serve as a reservoir for a lubricant tailored to the friction partners, i.e., chromium-5 steel and a carbon-containing friction layer, thus increasing the service life of the brake module without requiring large quantities of lubricant.

[0028] The brake module can comprise a housing in which the brake disc and the at least one thrust washer are guided, preferably coaxially, around a central axis, in particular the longitudinal axis of a drive shaft, in particular a threaded spindle, of the drive system. The brake module preferably comprises a cover disc which is connected to the housing, preferably by a latching connection, such that the brake disc and the at least one thrust washer are held in the housing. The cover disc can, for example, have latching recesses into which latching hooks of the housing can engage. Advantageously, the latching connection can be designed such that the cover disc cannot be separated from the housing without causing damage. Components arranged in the housing are thereby protected from tampering.

[0029] The brake module's structure along the longitudinal axis is preferably comprised of: spring, thrust washer, brake disc, thrust washer, and cover plate. These components are preferably all at least partially enclosed by the housing. This allows for easy installation of the brake module in the drive system without the risk of losing any part of the brake module.

[0030] The housing can comprise a number of, for example, one, two, three, four, five, six or seven housing slots, the longitudinal axis of which is advantageously aligned parallel to the longitudinal axis of the drive shaft. Furthermore, at least one thrust washer can have thrust washer projections directed radially outwards from the longitudinal axis, which are shaped complementarily to the housing slots, such that the housing slots and the thrust washer projections interact in a form-fitting manner against rotation of the thrust washer relative to the housing about the longitudinal axis. This prevents the thrust washer from rotating with the brake disc during braking, which could reduce or even eliminate the braking effect. By aligning the longitudinal axis of the slot parallel to the longitudinal axis of the drive shaft, the thrust washer can be easily inserted into the housing along the longitudinal axis when assembling the brake module.Advantageously, the housing slots are evenly distributed circumferentially around the longitudinal axis, i.e., at a constant angular distance from each other. This ensures that the housing is evenly loaded, which increases its service life.

[0031] The object of the invention is also achieved by a drive system, in particular for a door, comprising a brake module according to one of the preceding embodiments.

[0032] The object of the invention is also achieved by a manufacturing method for a brake module according to the invention, the brake module comprising at least one thrust washer and at least one brake disc, wherein the at least one thrust washer and the at least one brake disc each have at least one friction surface which rub against each other during braking operation, the method comprising the following steps: a. Providing a carrier, in particular a disc-shaped carrier, b. Providing at least one thrust washer blank for the thrust washer made of non-nitrided chromium-5 steel, b. Coating the carrier on at least one side with a friction layer comprising fibers and carbon, namely a carbon fiber fabric, for wear protection in order to form the brake disc.

[0033] The material of at least one friction layer of the brake disc thus comprises fibers and carbon, namely a carbon fiber fabric, which enables a more constant braking force over time, a lower temperature dependence of the braking force and a longer service life of the braking module. This allows the braking force to be better adapted to the respective application and requires significantly less tolerance compensation. The carrier can, for example, be more or less elastic than a brake disc consisting entirely of the friction layer. Furthermore, the thermal expansion behavior of the brake disc can be better coordinated with the thermal expansion behavior of the thrust washer(s) by using several, in particular two, different materials, thus reducing the temperature dependence of the braking force. Furthermore, the carrier can be made of a cost-effective plastic, which reduces the overall cost of the brake disc.

[0034] Preferably, the carrier is coated on two opposite sides with a friction layer to form the brake disc.

[0035] The step of coating the carrier may comprise applying a preferably partially elastic adhesive layer to at least one side of the carrier, after which the friction layer is applied to the adhesive layer. The adhesive layer can, for example, compensate for different thermal expansion coefficients of the friction layer(s) and the carrier. Furthermore, the adhesive layer allows for improved vibration damping.

[0036] The adhesive can be cured isobarically and variothermally, creating a permanent bond between the substrate and the friction layer.

[0037] The manufacturing process may also include the following steps: a. Providing at least one disk-shaped thrust washer blank made of steel, namely, according to the invention, non-nitrided chromium-5 steel, and preferably b. Polishing the thrust washer blank, preferably by ball polishing, to form the thrust washer.

[0038] It has been shown that polishing, and especially ball burnishing, can achieve a particularly uniform friction surface with fewer direction-dependent artifacts. This can also reduce the effect of the thrust washer only "braking flat" during operation, resulting in significant initial braking force variations, for example, in the first few hundred braking cycles. Furthermore, a uniform friction surface leads to less vibration during braking and thus lower noise generation.

[0039] The at least one thrust washer blank can be deburred, particularly in addition to polishing, for example, before polishing. This allows an even more uniform friction surface of the thrust washer to be achieved.

[0040] Further advantages, objectives, and features of the present invention will be explained with reference to the following description and the accompanying drawings, which illustrate exemplary brake modules and manufacturing methods according to the invention. Components of the devices that are at least substantially identical in terms of their function in the figures may be identified by the same reference numerals, although these components need not be numbered and explained in all figures. They show:

[0041] Fig. 1 shows an external view of a brake module according to the invention; Fig. 2 shows the brake module of the Fig.1 in sectional view; Fig. 3 the brake module of the Fig.1 and 2in exploded view; Fig. 4 a part of the brake module of the Fig.1, 2 and 3 in a further exploded view; Fig. 5 shows a brake disc according to the invention and a spindle nut. Fig. 6 shows a qualitative representation of the dependence of the braking torque of a prior art brake module on the number of braking cycles and the temperature; Fig. 7 shows a qualitative representation of the dependence of the braking torque of a brake module according to the invention on the number of braking cycles and the temperature; Fig. 8 shows a schematic flow diagram of a manufacturing method according to the invention.

[0042] Figure 1 shows an external view of a brake module 1 according to the invention. The brake module 1 is connected here to a spindle 2 of a drive system. The brake module 1 comprises a cylindrical outer housing 3.

[0043] Figure 2 shows the brake module 1 of the Fig.1in sectional view. The drive system comprises a spindle nut 4 connected to the spindle 2. During braking operation, the spindle nut 4 engages with a brake disc 5 of the brake module 1 arranged radially to the longitudinal axis of the spindle outside the spindle nut 4. The brake disc 5 comprises at least two friction surfaces which rub against adjacent friction surfaces of two thrust discs 6 during braking operation as a result of the relative rotation of the brake disc 5 with respect to the thrust discs 6 about the longitudinal axis. This exerts a braking torque on the spindle 2 of the drive system. A spring 7 exerts a spring force along the longitudinal axis on one of the thrust discs 6, whereby the brake disc 5 and the thrust discs 6 are pressed against one another to keep them in frictional contact. The strength of the spring force is a parameter by which the magnitude of the braking force can be determined. In this embodiment, the spring 7 is a wave spring.

[0044] Figure 3shows the brake module 1 of the Fig.1 and 2 Exploded view. The brake disc 5, the thrust washers 6, and the spring 7 are all arranged in a housing 8, the structure of which is explained below.

[0045] Figure 4 shows part of the brake module 1 of the Fig.1, 2 and 3in a further exploded view. The brake module 1 comprises, in addition to the housing 8, a cover disk 9. In the housing 8, the brake disk 5, the two thrust disks 6, and the spring 7 are guided coaxially around the longitudinal axis of the spindle (not shown here). The housing 8 is connected to the cover disk 9 by a snap-in connection, whereby the brake disk 5, the two thrust disks 6, and the spring 7 are held in the housing 8. The cover disk 9 has snap-in recesses 10 into which snap-in hooks 11 of the housing 8 can engage. The structure of the brake module along the longitudinal axis is thus: spring 7, thrust disk 6, brake disk 5, thrust disk 6, cover disk 9. These components are all at least partially enclosed by the housing 8 when assembled. This allows for easy installation of the brake module 1 in the drive system without the risk of losing any part of the brake module 1.

[0046] The housing 8 further comprises a number of, for example, five, housing slots 12 evenly distributed around the longitudinal axis of the spindle nut 4 in the circumferential direction of the housing, with a slot longitudinal axis parallel to the longitudinal axis. Thrust washer projections 13 of the thrust washers 6, directed radially outward from the longitudinal axis, engage in the housing slots 12. This prevents relative rotation of the housing 8 and the thrust washers 6 against each other about the longitudinal axis when the brake disc 5 rotates with the spindle 2 and rubs against the thrust washers 6 during braking.

[0047] The brake disc 5 is annular and has a central recess. The central recess has an approximately circular cross-section with at least two, for example four, tooth sections 14 that are evenly distributed around the longitudinal axis in the circumferential direction of the brake disc 5 and separated from one another by recesses 15. This is explained in more detail below. Figure 5 explained in more detail.

[0048] Figure 5shows a brake disc 5 according to the invention and a spindle nut 4 in a top view. The tooth sections 14 comprise radially inwardly projecting teeth 16. Such a configuration allows a flexible connection of the brake disc 5 to the spindle nut 4 of the drive system. The spindle nut 4 comprises spindle nut wings 17 that engage in the recesses 15, and the torque is transmitted between the spindle nut 4 and the brake disc 5 via the contact between the spindle nut wings 17 and the teeth 16. Tilting of the brake disc 5 and the spindle nut 4 is thus less likely than with a positive connection. This makes it easier to install the brake module 1 late in the production process of a drive system, to avoid vibration damage caused by a later assembly time, and to replace the brake module 1 if the brake module 1 is defective, since the brake module 1 can be placed on the spindle nut 4 more easily.

[0049] Figure 6 shows a qualitative representation of the dependence of the braking torque BM of a state-of-the-art brake module on the number of braking cycles BZ and the temperature. The braking cycles are shown logarithmically, and the development of the braking force is plotted for three temperatures that cover all relevant operating temperatures. Such a brake module, for example, uses thrust washers made of nitrided chrome jet and a brake disc made of sintered steel. As can be seen, the braking force of the brake module decreases during the first few hundred braking cycles, before gradually increasing again. Furthermore, it can be seen that the braking force varies greatly with temperature, which is illustrated by the double arrow, which indicates the tolerance range TB of the braking system.

[0050] Figure 7shows a qualitative representation of the dependence of the braking torque BM of a brake module 1 according to the invention on the number of braking cycles BZ and the temperature. The braking cycles are again shown logarithmically, and the development of the braking force is plotted for three temperatures that cover all relevant operating temperatures. As can be seen, the braking force varies only slightly depending on the braking cycles that have passed. Furthermore, it can be seen that the braking force varies significantly less with temperature, which is illustrated by the double arrow that indicates the tolerance range TB of the braking system. Thus, the braking force is much easier to define and does not have to be selected such that it is significantly too high for a large part of the service life and temperature range, as in the prior art. This reduces the average wear of the brake disc and the thrust washers, which partly explains the increased service life of the braking system.A drive system with such a brake module is also more comfortable to handle, more energy-efficient and longer-lasting due to the lower braking force in most operating situations.

[0051] Figure 8 shows a schematic flow diagram of a manufacturing process according to the invention. The manufacturing process according to the invention comprises the following steps: a. Providing a, for example, disc-shaped, carrier 18, for example made of plastic, optionally: a1. Coating the carrier 18 on at least one side (here on two sides) with an adhesive layer 19, c. Coating the carrier 18 (or optionally the adhesive layer 19) on at least one side (here on two sides) with a friction layer 20 comprising fibers and carbon, namely a carbon fiber fabric, in order to form the brake disc 5.

[0052] The carrier 18 can, for example, be less elastic or more elastic than a brake disc 5 consisting entirely of the friction layer 20. Furthermore, the carrier 18 can be made of a cost-effective plastic.

[0053] The step of coating the carrier 18 may comprise applying a preferably partially elastic adhesive layer 19 to at least one side of the carrier 18, after which the friction layer 20 is applied to the adhesive layer 19. LIST OF REFERENCE SYMBOLS

[0054] 1 Brake module 2 Spindle 3 Outer housing 4 Spindle nut 5 Brake disc 6 Thrust washer 7 Spring 8 Housing 9 Cover plate 10 Recesses 11 Latching hook 12 Housing slot 13 Thrust washer projection 14 Tooth section 15 Recess 16 Tooth 17 Spindle nut flights 18 Carrier 19 Adhesive layer 20 Friction layer BM Braking torque BZ Number of braking cycles TBTolerance range

Claims

1. A brake module (1) for a drive system, in particular for doors, comprising at least one thrust washer (6) and at least one brake disc (5), a. wherein the at least one thrust washer (6) and the at least one brake disc (5) each comprise at least one friction surface which rub against each other in braking operation, and b . wherein at least one of the friction surfaces of the brake disc (5) is formed by a friction layer (20) for protecting the brake disc (5) and / or thrust washer (6) from wear, c . wherein the brake disc (5) comprises a carrier (18) and at least one friction layer (20) connected to the carrier (18), d . wherein the friction layer (20) comprises a carbon fiber mesh, characterized in that e . the thrust washer (6) consists of non-nitrided chromium-5 steel.

2. The brake module (1) according to claim 1, characterized in that the brake module (1) comprises a thrust washer (6) on each of two opposite sides of the brake disc (5), wherein the brake disc (5) comprises a friction surface facing each of the thrust washers (6), each friction surface having a friction layer (20).

3. The brake module (1) according to one of claims 1 to 2, characterized in that the brake disc (5) comprises a. a carrier (18) made of a plastic, and / or b. two friction layers (20) connected to the carrier (18) on opposite sides of the carrier (18).

4. The brake module (1) according to one of claims 1 to 3, characterized in that the at least one friction layer (20) is fastened to the carrier (18) by means of a material bond, preferably by means of a preferably partially elastic glue layer (19).

5. The brake module (1) according to one of claims 1 to 4, characterized in that the brake disc (5) is annular and preferably comprises a central aperture, wherein the central aperture has an approximately circular cross-section having at least two tooth sections (14) separated by clearances (15).

6. The brake module (1) according to one of claims 1 to 5, characterized in that the brake disc (5) and / or the thrust washer (6) has a number of depressions in a friction surface for receiving a lubricant.

7. The brake module (1) according to one of claims 1 to 6, characterized in that the brake module (1) comprises a housing (8) in which the brake disc (5) and the at least one thrust washer (6) are guided, preferably coaxially about a central axis, wherein the brake module (1) preferably comprises a cover plate (9) which is particularly preferably connected to the housing (9) by a latching connection such that the brake disc (5) and the at least one thrust washer (6) are held in the housing (8).

8. A drive system, in particular for a door, comprising a brake module (1) according to one of the preceding claims.

9. A production method for a brake module (1) according to one claims 1 to 7 comprising at least one thrust washer (6) and at least one brake disc (5), wherein the at least one thrust washer (6) and the at least one brake disc (5) each have at least one friction surface which rub against each other during braking operation, characterized by the following steps: a. providing a carrier (18), b. providing at least one thrust washer blank consisting of non-nitrided chromium-5-steel for the thrust washer (6), and c. coating the carrier (18) on at least one side with a friction layer (20) comprising a carbon fiber mesh for wear protection, in order to form the brake disc (5).

10. The production method according to claim 9, characterized in that the step of coating the carrier (18) comprises applying a, preferably partially elastic, glue layer (19) on at least one side of the carrier (18), whereafter the friction layer (20) is applied on the glue layer (19).

11. The production method according to one of claims 9 to 10, characterized by the following steps polishing and / or deburring the thrust washer blank in order to form the thrust washer (6).