Axial foil bearings with domes and an assembly method

Abstract

This invention relates to an axial foil bearing (1) comprising a base plate (2) with a corrugated foil (3) arranged axially above it, the corrugated foil having a plurality of wave-shaped spring structures (4), and a cover foil (5) arranged axially above the corrugated foil (3), wherein the corrugated foil (3) and the cover foil (5) are attachable to the base plate (2), wherein the base plate (2), the corrugated foil (3) and the cover foil (5) are arranged such that an aerodynamic sliding bearing is realized when rotated about a common axis, wherein the base plate (2) has integral / one-piece / one-material rivet domes (6) projecting in the axial direction, which are arranged radially outside a functional area of ​​the corrugated foil (3) and are designed to connect the base plate (2) with the corrugated foil (3) and / or the cover foil (5) to each other, forming a forming-induced collar.wherein there is clearance in the radial and circumferential directions between the dome (6) and the corrugated foil (3). Furthermore, this invention relates to an assembly method for mounting an axial foil bearing.

Description

[0001] The invention relates to an axial foil bearing comprising a base plate, with a corrugated foil arranged thereabove in the axial direction, which has a plurality of wave-shaped spring structures, and a cover foil arranged axially above the corrugated foil. The corrugated foil and the cover foil can be attached to the base plate. The base plate, the corrugated foil, and the cover foil are arranged such that an aerodynamic plain bearing is realized upon rotation about a common axis. Furthermore, this invention relates to an assembly method for assembling an axial foil bearing.

[0002] Axial foil bearings are known from the prior art, in which a plurality of individual segments, each consisting of a corrugated foil and a cover foil, are arranged in a circular arc on a base or carrier plate. In many cases, the individual corrugated and cover foil segments are individually welded to the base plate.

[0003] Axial foil bearings, particularly aerodynamic axial plain bearings with a foil design, are also known, in which several resilient segments are attached to a one-piece corrugated foil and the same number of sliding surfaces are attached to a one-piece cover foil. In such cases, the individual parts are often joined by welding.

[0004] Furthermore, axial foil bearing designs are also known, which consist of additional layers of corrugated foil or intermediate foil. Some complex variants are also known regarding the connection of the individual components.

[0005] The publication CN 111 561 438 A describes an axial foil bearing consisting of a plurality of individual corrugated and cover foil segments. These are arranged on a base plate and fastened there with rivet elements. The circular base plate, which is fastened in the bearing housing, has a plurality of rivet groups in the circumferential direction, with each rivet group in turn consisting of a plurality of rivets arranged in the radial direction. The fan-shaped split corrugated foil is mounted on the base plate and has a first free end at one end and a first fastening end at the other end, which is designed as a first fastening plate (flat surface) and is provided with rivet holes for the rivets of the base plate.The cover film, also fan-shaped, is mounted on the split corrugated film and has a second free end at one end and a second fastening end at the other end, which serves as a second fastening plate and is also provided with rivet holes for the rivets of the base plate. The cover film consists of the upper surface area with the free end, which is connected to the fastening plate by a ramp.

[0006] EP 4 067 680 describes a pressure foil bearing, i.e. an axial foil bearing with a hump foil plate and a cover plate, wherein the connection of both plates is effected via at least one locking ring which is designed to penetrate into the through hole of the cover plate.

[0007] Welding the individual foils together generates heat, which can lead to warping of the individual parts and possibly a deterioration of the unevenness (deterioration of the flatness of the base plate). This can negatively impact the function and spring stiffness of the foil bearings.

[0008] It is therefore an object of the present invention to provide an improved axial foil bearing.

[0009] This is solved according to the invention by the subject matter of claim 1.

[0010] This is achieved according to the invention in that the base plate has integral / one-piece / single-material domes projecting in the axial direction, which domes are arranged radially outside a functional area of ​​the corrugated foil and are designed to connect the base plate to the corrugated foil and / or the cover foil to one another to form a forming collar, wherein there is play in the radial and circumferential directions between the dome and the corrugated foil.

[0011] In other words, the invention relates to an axial foil bearing consisting of as few individual parts as possible, which is realized by incorporating a large number of spring structures into a single corrugated foil and a large number of coated sliding surfaces into a single cover foil, which are connected to a base plate. The one-piece design of the two foils not only reduces the number of individual parts, but also the number of required connection points. Furthermore, the connection is realized by simple rivet elements, which are located directly on the base plate in the form of collars and are riveted or folded over after the corrugated and cover foils have been installed. The base plate, the corrugated foil and the cover foil are arranged in such a way that an aerodynamic sliding bearing is realized when a rotation partner rotates or when the bearing rotates around a common axis.

[0012] The advantage of the invention is the small number of individual parts and also the small number of connection points. This reduces assembly effort. Furthermore, the connection points are all located outside the functional area. The functional area refers to the circular surface of the corrugated foil, on which the numerous spring structures extend and over which the sliding surfaces of the cover foil are arranged. This allows the freed-up space to be used for the sliding surfaces. It is therefore possible to either increase the number of sliding surfaces or to optimize the sliding surfaces in terms of their dimensions. This also enables an increase in performance.In addition to arranging the attachment points outside the circular functional surface and reducing the number of attachment points, the arrangement and design provides radial play, which allows for sufficient radial and circumferential play between the through holes in the cover foil and the outer perimeter of the dome, even under mechanical influences such as thermal influences. This prevents the foils from becoming distorted relative to one another, which also prevents bearing distortion. Another advantage is that the flexural rigidity or spring stiffness of the foils, and thus the air cushion formed by the foils, is not negatively affected.

[0013] Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

[0014] Advantageously, the domes integrally formed on the base plate are in the form of axial projections in a type of sheet metal penetrations or hollow rivets, with the wall thickness of each dome advantageously being smaller than the thickness of the base plate. Particularly preferably, the wall thickness of each dome is at least less than or equal to 75% of the wall thickness of the base plate, so that the dome can be formed to securely connect the base plate to the corrugated and cover foil. Alternatively, the wall thickness of the dome can be in a range of 25% to 75%.

[0015] Preferably, the base plate and / or the corrugated foil and / or the cover foil have a closed, ring-like contour, wherein the corrugated foil and the cover foil are preferably formed from a thin spring sheet or a thin foil. The circular ring shape of the corrugated foil and / or the cover foil is each formed by a plurality of circular ring segments.

[0016] Preferably, the corrugated foil and the cover foil have integral through-holes that are evenly distributed around the circumference or arranged at different angles but symmetrically, i.e., on a partial circle, to a transverse axis. These through-holes are aligned so that they are aligned with the domes of the base plate. "Evenly distributed" means that the through-holes are positioned at the same distance from one another or arranged in a specific symmetrical distribution pattern. Ideally, the through-holes are equally spaced from one another; however, the through-holes outside the functional area can be arranged as groups of through-holes, and the groups of through-holes can have an angle difference from one another.

[0017] Preferably, the base plate and / or the corrugated foil and / or the cover foil each have a flat tab on a partial circle on their circular outer diameter, on which the through holes of the respective foil or the domes of the base plate are arranged.

[0018] Preferably, each individual segment of the corrugated foil consists of a wave-shaped spring element which has a free end in the circumferential direction at one end and at least one fixed connection in the form of one or more connecting webs at the other end. This connection is firmly connected to a flat segment web formed in the radial direction. A large number of these individual segments are evenly arranged in the circumferential direction. The firm connection to one another is again achieved with at least one connecting web in the circumferential direction. Ideally, there is an inner connecting web on the inner diameter and an outer connecting web on the outer diameter. Alternatively, however, it is also conceivable to connect the individual segments with only one connecting web running in the circumferential direction. For space reasons (e.g. installation space, shaft diameter, connection of the individual parts, etc.), it is not possible to use a single connecting web.) It may be advantageous to design this as an external connecting web on the outer diameter. The spring behavior can be adapted to the specific bearing requirements through, among other things, the dimensional design as well as the shape and number of shafts.

[0019] Preferably, each individual segment of the cover film consists of a sliding surface which has a free end at one end in the circumferential direction and a shoulder at the other end, which in turn is firmly connected to a flat segment web formed in the radial direction. A large number of these individual segments, which must be equal to the number of corrugated film segments, are also arranged evenly in the circumferential direction. In the cover film, too, the individual segments are firmly connected by at least one connecting web in the circumferential direction. Ideally, there is an inner connecting web on the inner diameter and an outer connecting web on the outer diameter. An alternative with only one connecting web running in the circumferential direction is also conceivable for the cover film, as already described for the corrugated film.During assembly, each sliding surface, in conjunction with the corrugated foil, forms a wedge surface and a locking surface, which are required for the function of an aerodynamic axial foil bearing. The dimensional design of the shoulder height allows the wedge height to be ideally and, above all, easily adapted to the bearing requirements. For improved wear protection, the upper side of the sliding surfaces, i.e., the sides that come into contact with the rotating rotor disk, are coated with a heat-resistant anti-friction coating. Alternatively, to avoid the laborious masking of the upper side for a partial coating, the entire upper side of the cover foil can be coated.

[0020] To connect the corrugated foil and the cover foil to the base plate, both foils have numerous through holes. Such corrugated foils and cover foils are ideally manufactured using non-cutting processes, such as punching, forming, bending, etc.

[0021] Preferably, the base plate has a plurality of holes arranged along a pitch circle of the base plate and serving for fastening in a bearing housing. Alternatively, the domes in the form of hole passages serve as a fastening option in a bearing housing.

[0022] The base plate can be manufactured using machining and / or non-machining processes. For a cost-effective solution, non-machining processes are preferred, in which the shape and mounting holes are punched out. The domes can be manufactured using collar drawing as sheet metal inserts, known as collars. Any required undercut can be stamped.

[0023] Furthermore, the invention relates to a method for assembling an axial foil bearing according to the invention, in particular an axial foil bearing according to the invention according to the preceding features.

[0024] The assembly process comprises three essential steps: In a first step, a corrugated foil, which has a plurality of wave-shaped spring structures, is arranged axially on a base plate so that the central axes and a plurality of through holes in the corrugated foil are each congruent with a dome of the base plate. For better alignment or as an alignment aid, additional positioning aids can be added if necessary, for example in the form of cutouts that are congruently arranged on all foils.

[0025] In a second step, the cover film is arranged in the axial direction on the corrugated film so that the central axes and a plurality of through holes of the cover film are congruent with the plurality of through holes of the corrugated film.

[0026] In a third and final step, the shape of the protruding part of the respective dome is changed so that the corrugated film and the cover film are held on the base plate in the stacking direction / axial direction.

[0027] This prevents the axial foil bearing from falling apart. Furthermore, the domes, in the form of sheet metal through-holes, ensure the correct alignment of the corrugated foil and cover foil. This ensures that the sliding surfaces of the cover foil are correctly positioned over the wave-shaped spring elements of the corrugated foil, thus enabling the functionally important wedge and locking surfaces to be generated.

[0028] The invention is explained in more detail below with the aid of a drawing. It shows: Fig. 1 a schematic representation of an axial foil bearing according to the invention according to a first embodiment; Fig. 2 an exploded view of an axial foil bearing according to the invention according to a first embodiment; Fig. 3 two possible designs of a dome of a base plate of the axial foil bearing according to the invention; Fig. 4 shows an inventive assembly method of an axial foil bearing according to the invention; Fig. 5 the second step of the assembly method according to the invention; Fig. 6 the third step of the assembly method according to the invention; Fig. 7 a schematic representation of an axial foil bearing according to the invention according to a second embodiment; Fig. 8 a schematic representation of an axial foil bearing according to the invention according to a third embodiment; Fig. 9 a schematic representation of an axial foil bearing according to the invention according to a fourth embodiment; Fig. 10 is a schematic representation of an axial foil bearing according to the invention according to a fifth embodiment; and Fig. 11 a schematic representation of a variation of an axial foil bearing according to the invention.

[0029] The figures are merely schematic and serve solely to clarify the invention. The same elements are designated by the same reference numerals.

[0030] Fig. 1 shows a schematic representation of an axial foil bearing 1 according to the invention according to a first exemplary embodiment. The axial foil bearing 1 has a base plate on which bores 13, preferably three bores 13, are arranged in its radial outer surface. The cover foil 5 has a total of 6 circular segments 9, which serve as a sliding surface 15. To connect the individual parts, the base plate 2 has domes 6, which are similar in design to a hollow rivet or sheet metal through-holes and are made in one piece with the base plate 2. The domes 6 must lie on the same pitch circle diameter as the through holes 7 of the corrugated foil 3 and the cover foil 5 and be arranged with the same spacing.

[0031] In order to connect the corrugated foil 3 and the cover foil 5 to the base plate 2, these two foils must have through-holes 7. A large number (but at least 3) of through-holes 7 are arranged on a pitch circle on each individual foil. The pitch circle for the through-holes 7 must be at least large enough that the closing heads of the domes 6 created during later assembly do not protrude into the functional area of ​​the sliding surfaces 15 or the pitch circle must be large enough that there is a gap between the outer diameter of the sliding surfaces 15 and the closing heads, so that they lie outside the effective area of ​​the sliding surfaces 15 and the rotor disk. For the through-holes 7, both the corrugated foil 3 and the cover foil 5 have flat tabs 9 on their circular outer diameters, each of which contains a through-hole 7. The number of tabs per foil is therefore equal to the number of through-holes.The positions of the through holes 7 on the two foils must be selected so that they are congruent after assembly and that the alignment of the two foils to each other required for the bearing function is ensured.

[0032] Fig. 2 shows an exploded view of an axial foil bearing 1 according to the invention according to the first embodiment according to Fig. 1.

[0033] From top to bottom, i.e. opposite to the axial direction, the cover foil 5, the corrugated foil 3 and the base plate 2 are shown.

[0034] The corrugated foil 3 has a total of 6 individual segments / circular segments 9, each of which consists of a wave-shaped spring element 4 which has a free end in the circumferential direction at one end and at least one fixed connection in the form of a connection web / connecting web 14 at the other end. This connection is firmly connected to a flat segment web formed in the radial direction. A large number of these individual segments / circular segments 9 are evenly arranged in the circumferential direction. The firm connection to one another is again achieved with at least one connecting web 10 in the circumferential direction. Ideally, there is an inner connecting web 11 on the inner diameter and an outer connecting web 12 on the outer diameter. Alternatively, however, a connection of the individual segments / circular segments 9 with only one connecting web running in the circumferential direction is also conceivable. For reasons of space (e.g.Depending on the circumstances (e.g., installation space, shaft diameter, connection of the individual parts, etc.), it may be advantageous to implement this as an external connecting web 12 on the outer diameter. The spring behavior can be adapted to the specific bearing requirements, among other things, by the dimensional design as well as the shape and number of shafts.

[0035] The cover film 5 also has a total of 6 individual segments / circular segments 9, each consisting of a sliding surface 15 which has a free end at one end in the circumferential direction and a shoulder 16 at the other end, which in turn is firmly connected to a flat segment web formed in the radial direction. A large number of these individual segments / circular segments 9, which must be equal to the number of corrugated film segments, are also arranged evenly in the circumferential direction. In the cover film 5, too, the individual segments / circular segments 9 are firmly connected by at least one connecting web 10 in the circumferential direction. Ideally, there is an inner connecting web 11 on the inner diameter and an outer connecting web 12 on the outer diameter. An alternative with only one connecting web running in the circumferential direction is also conceivable for the cover film 5, as already described for the corrugated film.During assembly, each sliding surface 15, in conjunction with the corrugated foil 3, forms a wedge surface 17 and a locking surface 18, which are required for the function of an aerodynamic axial foil bearing. By dimensioning the shoulder height, the wedge height can be ideally and, above all, easily adapted to the bearing requirements. For improved wear protection, the upper side of the sliding surfaces 15, i.e., the sides that come into contact with the rotating rotor disk, are coated with a heat-resistant anti-friction coating. Alternatively, to avoid the laborious task of covering the upper side for a partial coating, the entire upper side of the cover foil 5 is coated.

[0036] For connecting the corrugated foil 3 and the cover foil 5 to the base plate 2, both foils have a plurality of through holes 7.

[0037] The base plate 2 has a total of three holes 13, which are arranged on a pitch circle of the base plate 2 and serve for fastening in a bearing housing. Alternatively, the domes 6, in the form of hole through holes, serve as a fastening option in a bearing housing.

[0038] Alternatively, the outer diameter of the outer connecting webs 12 can be enlarged to accommodate the through holes 7. This results in the foils having a circular and uninterrupted outer diameter. However, in such a case, additional holes 13 must be provided for mounting the axial foil bearing in a bearing housing.

[0039] Fig. 3 shows two possible designs of a dome 6 of a base plate 2 of the axial foil bearing 1 according to the invention.

[0040] In the upper part of the Fig. 3 shows a dome 6, which is designed as a hollow rivet or sheet metal penetration. The wall thickness of the dome 6 is thinner, preferably less than or equal to 75%, of the thickness of the base plate 2.

[0041] In the lower part of the Fig. 3 shows a dome 6 in which a relief cut 19 is provided on the side on which the corrugated foil 3 and cover foil 5 are mounted.

[0042] Fig. 4 shows an inventive assembly method of an inventive axial foil bearing 1.

[0043] For the sake of simplicity, only the essential individual components of the axial foil bearing are used to describe the assembly process.

[0044] During assembly, the corrugated foil 3 is aligned over the base plate 2 so that both central axes and also the domes, in the form of hollow rivets or sheet metal penetrations 6, are congruent with the through-holes 7. In this aligned position, the corrugated foil 3 is placed on the base plate 2. The cover foil 5 is then aligned over the corrugated foil 3 so that the central axes and the domes / sheet metal penetrations 6 are also congruent with the through-holes 7. In this aligned position, the cover foil 5 is placed on the corrugated foil 3. This creates a layered structure of the axial foil bearing 1 in the stacking direction, i.e. in the axial direction, and the domes / sheet metal penetrations 6 reach through the through-holes 7 and protrude a defined distance above the surface of the cover foil 5. During assembly, care must be taken to ensure that the individual parts are placed on top of one another the right way round.The protruding part of the domes / sheet metal penetrations 7 is then riveted / folded. This holds the corrugated foil 3 and the cover foil 5 in the stacking direction on the base plate 2, preventing the axial foil bearing 1 from falling apart.

[0045] Furthermore, the domes / sheet metal penetrations 6, in conjunction with the through holes 7, ensure the correct alignment of the corrugated foil 3 and the cover foil 5. This ensures that the sliding surfaces 15 of the cover foil 5 are correctly positioned over the wave-shaped spring elements 4 of the corrugated foil 3, thus enabling the functionally important wedge surfaces 17 and locking surfaces 18 to be generated.

[0046] Fig. 5 shows the second step of the assembly method according to the invention, in which the corrugated foil 3 and the cover foil 5 are already arranged on the base plate 2. In an upper detailed view, a dome 6 can be seen projecting beyond the surface of the cover foil 5. In the lower detailed view, a dome 6 is also shown projecting beyond the surface of the cover foil 5, with the dome 6 having a relief cut 19.

[0047] Fig. Figure 6 shows the third step of the assembly method according to the invention, in which the forming of the dome 6 has already taken place. Depending on the requirements, the connection points can be formed in the axial direction without (according to the upper detailed view of the Fig. 6) or with play (according to the lower detailed view of the Fig. 6). A design with axial play between the foils 3, 5 and the closing heads of the dome 6 represents an additional safety measure to prevent tension between the individual parts. In cases with axial play, a targeted axial preload of the axial foil bearings 1 in the assembly can ensure that the individual parts are free of play in the axial direction. The preload eliminates this play and ensures that the individual parts are pressed together, thus creating the functionally important wedge 17 and locking surfaces 18.

[0048] In the Fig. Figures 7-10 show further embodiments of the axial foil bearing 1 according to the invention with identical individual components. Therefore, only the differences are shown.

[0049] The individual designs are basically differentiated by the design of the outer contour of the base plate 2, the corrugated foil 3 and the cover foil 5, as well as the number and arrangement of dome 6 and through holes 7.

[0050] The angular distribution of the through holes 7 and the domes / sheet metal passages 6 is generally evenly spaced on identical pitch circle diameters. However, an uneven position distribution can also be selected, i.e. regularly patterned around the circumference of the pitch circle diameter. By selecting a different position distribution between the axial foil bearings 1 for clockwise rotation and the axial foil bearings 1 for counterclockwise rotation, incorrect assembly in the unit can be prevented, for example. The through hole diameters must be designed with regard to the clearance between the cylindrical surfaces of the through holes 7 and the lateral surfaces of the domes / sheet metal passages 6 so that the foils are not distorted after assembly due to shape and position inaccuracies or shape errors.The circumferential position or the number of connection points can also be freely selected depending on customer and functional requirements. However, there should be at least three connection points. Thus, one connection point provides alignment, another connection point provides rotational fixation, and the rest act as additional fixations.

[0051] If necessary, the individual through-hole diameters can be designed with different clearances. Depending on the dimensional tolerances as well as the shape and position tolerances, a small amount of clearance can be designed for alignment and rotational fixing, and a larger amount of clearance for the rest to avoid constraints. In such a case, however, the paired through-holes 7 of the individual films should be aligned with one another during assembly. This means that the through-holes 7 are arranged one above the other with the same clearance. To make it easier to ensure this correct positional orientation during assembly, positioning aids in the form of, for example, bores 13, grooves, etc. can be attached to the corrugated film 3 and cover film 5.It is also possible to realize the different clearances between the cylindrical surfaces of the through holes 7 and the lateral surfaces of the domes / sheet metal penetrations 6 by using different outer diameters of the individual domes / sheet metal penetrations 6. Thus, all through-hole diameters can be designed identically, and additional positional alignment during assembly is not required.

[0052] Fig. 11 shows a schematic representation of a variation of an axial foil bearing 1 according to the invention.

[0053] Shown are two identically constructed axial foil bearings 1 according to the invention, which are to be connected to one another in the axial direction or fastened to a bearing housing. The inner diameters of the domes / sheet metal penetrations 6 can be used for mounting the axial foil bearing 1 in a bearing housing or for stacking multiple axial foil bearings 1. In this variant, the screws or pins 20 are guided directly through the inner diameter of the domes / sheet metal penetrations 6. In such cases, the additional bores 13, which must be present at least on the base plate 2 in the other design variants and serve as mounting bores, can be omitted.

[0054] A combination of the different embodiments / detail solutions of the design variants is possible.

[0055] The invention is not limited to the embodiments illustrated in the figures. The above description is therefore not to be considered restrictive, but rather explanatory. The following claims are to be understood in such a way that a stated feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. Where the claims and the above description define 'first' and 'second' features, this designation serves to distinguish between two (e.g.) similar features without establishing a priority. List of reference symbols 1 axial foil bearing 2 base plate 3 corrugated foil 4 wave-shaped spring structures 5 Cover film 6 Cathedral 7 through holes 8 tab 9 circle segments 10 connecting bridge 11 radial inner connecting web 12 radial outer connecting web 13 Hole 14 connecting bridge 15 Sliding surface 16 paragraph 17 Wedge surface 18 Rest area 19 undercut 20 pens QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 111 561 438 A

[0005] EP 4 067 680

[0006]

Claims

[1] Axial foil bearing (1) comprising a base plate (2), with a corrugated foil (3) arranged thereabove in the axial direction, which has a plurality of wave-shaped spring structures (4), and a cover foil (5) arranged thereabove in the axial direction, wherein the corrugated foil (3) and the cover foil (5) are attachable to the base plate (2), wherein the base plate (2), the corrugated foil (3) and the cover foil (5) are arranged such that an aerodynamic plain bearing is realized upon rotation about a common axis, characterized bythat the base plate (2) has integral / one-piece / single-material domes (6) projecting in the axial direction, which domes are arranged radially outside a functional area of the corrugated foil (3) and are designed to connect the base plate (2) to the corrugated foil (3) and / or the cover foil (5) to one another to form a deformation-related collar, wherein there is play in the radial and circumferential directions between the dome (6) and the corrugated foil (3). [2] Axial foil bearing (1) according to claim 1, characterized by that the domes (6) are designed as axial projections in the form of sheet metal penetrations or hollow rivets. [3] Axial foil bearing (1) according to claim 1 or 2, characterized by that the wall thickness of the dome (6) is smaller than the thickness of the base plate (2). [4] Axial foil bearing (1) according to one of claims 1 to 3, characterized bythat the base plate (2) and / or the corrugated film (3) and / or the cover film (5) have a ring-like closed contour. [5] Axial foil bearing (1) according to one of claims 1 to 4, characterized by that the corrugated foil (3) and / or the cover foil (5) are formed from a spring sheet or a foil. [6] Axial foil bearing (1) according to one of claims 1 to 5, characterized by that the corrugated foil (3) and the cover foil (5) have integral through holes (7) which are evenly distributed over the circumference or at different angles but arranged symmetrically to a transverse axis. [7] Axial foil bearing (1) according to one of claims 1 to 6, characterized by that the base plate (2) and / or the corrugated foil (3) and / or the cover foil (5) each have a tab (8) on a partial circle on their circular outer diameter, on which the through holes (7) are arranged. [8] Axial foil bearing (1) according to one of claims 1 to 7, characterized by that the corrugated foil (3) and / or the cover foil (5) is formed by a plurality of circular segments (9), wherein the plurality of these circular segments (9) are arranged uniformly in the circumferential direction and wherein the circular segments are firmly connected by a connecting web (10) in the circumferential direction, and the corrugated foil (3) and / or the cover foil (5) have a radially inner connecting web (11) and a radially outer connecting web (12). [9] Axial foil bearing (1) according to one of claims 1 to 8, characterized by that the base plate (2) has a plurality of bores (13) which are arranged on a pitch circle of the base plate (2) and serve for fastening in a bearing housing. [10] Assembly method for assembling an axial foil bearing (1) comprising the following steps: - arranging a corrugated foil (3) having a plurality of wave-shaped spring structures (4) in the axial direction on a base plate (2) so that the central axes and a plurality of through holes (7) of the corrugated foil (3) are congruent with a respective dome (6) of the base plate (2); - arranging a cover film (5) in the axial direction on the corrugated film (3) so that the central axes and a plurality of through holes (7) of the cover film (5) are congruent with the plurality of through holes (7) of the corrugated film (3); - Change in shape of the protruding part of the respective dome (6) so that the corrugated film (3) and the cover film (5) are held on the base plate (2) in the stacking direction / axial direction.

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