WO2023227155A1

WO2023227155A1 - Axial foil bearing - alignment and connection of the individual parts thereof

Info

Publication number: WO2023227155A1
Application number: PCT/DE2023/100275
Authority: WO
Inventors: Andre Anger
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2022-05-23
Filing date: 2023-04-17
Publication date: 2023-11-30
Also published as: DE102022112906A1

Abstract

The invention relates to an axial foil bearing in which several foils (2, 3) can be aligned and oriented via a bendable tab (7) and finally also held together by the same.

Description

Axial foil laqer - alignment and connection of its individual parts

Foil bearings are intended for the aerodynamic mounting of shafts, with a supporting gas/air cushion being formed between the shaft and the foil bearing. The functionality is similar to that of a hydrodynamic plain bearing, with the difference that the shaft is supported by the foil bearing via an air cushion and not by a liquid cushion of a hydrodynamic plain bearing. What both functional forms have in common is that only the rotational movement of the shaft leads to the formation of the supporting cushion.

Foil bearings differ from conventional aerodynamic bearings in that they have a compliant, elastic structure between the rotating shaft and the stationary housing component. This feature means that they are less rigid than conventional air bearings, but they can adapt to geometric air gap changes caused by, for example, misalignment of the bearing seats or different thermal expansion of the shaft and housing, thereby enabling higher operational reliability in many practical applications.

A variety of designs of foil bearings are known in the prior art. In addition to radial foil bearings for radial load capacity, there are also axial foil bearings that can provide axial load capacity.

The foil bearings can therefore be distinguished into radial foil bearings, which enclose the shaft to be supported on its outer peripheral surface, and axial foil bearings, which allow the shaft to move axially during operation against the air cushion that has built up. Both types of foil bearings avoid mechanical contact between the shaft and the foil bearing during operation due to the air cushion.

To form the load-bearing air cushion, the foil bearing usually has a cover foil that is in contact with the stationary shaft and a corrugated foil arranged radially between the cover foil and the base plate (in the case of the axial foil bearing) or the outer ring (in the case of the radial foil bearing) of the bearing, which in can deflect elastically in the axial direction (for the axial foil bearing) or in the radial direction (for the radial foil bearing). Thus, the foil bearing basically has two foils that are in contact with one another and an outer ring/base plate that carries the foils, so that the foil bearing can be accommodated in or by a housing. The base plate or the outer ring can also be formed in one piece from the housing on which the foils of the axial foil bearing are applied or into which the foils of the radial foil bearing are inserted.

Thus, the aforementioned flexible, elastic structure between the rotating shaft and the stationary housing component is formed by the film package consisting of the cover film and the corrugated film, the corrugated film having the elasticity to deflect and the cover film being arranged between the corrugated film and the shaft.

If the shaft is set in rotation relative to the film bearing, the air present in the air gap defined by the standstill is displaced. Once the shaft reaches a certain speed, an air cushion forms between the cover film and the shaft on which the shaft can slide. The film package consisting of cover film and corrugated film with its corrugated film and its radial spring effect ensures that fluctuations in air pressure or vibrations of the shaft in the radial or axial direction do not affect the bearing and thus keep the air cushion stable.

The arrangement of the bearing foils and their geometric design are varied and adapted to every application.

The task is to further develop known foil bearings, in particular axial foil bearings.

This task is solved by the features of the independent claims that are essential to the invention. Advantageous developments of the solution according to the invention are the subject of the dependent claims. Thus, an axial foil bearing according to the invention with at least one cover foil, at least one corrugated foil and a base plate, the cover foil, the corrugated foil and the base plate being arranged in a layered, stack-like structure to form the axial foil bearing, and the cover foil, the corrugated foil and the base plate each being one have a disc-shaped basic shape, the task is achieved in that the base plate is made of a metal foil or a sheet of metal and has a first tab which projects at an angle to the disc-shaped basic shape of the base plate and which engages both in a complementary receptacle of the cover film and in a complementary receptacle of the corrugated film in order to align the cover film, the corrugated film and the base plate with one another in the radial direction of the axial film bearing for the layered structure of the axial film bearing, so that in the stacking direction the cover film covers the corrugated film for reliable operation of the axial film bearing.

The term disc-shaped in the sense of the invention is to be understood as meaning the shape which is illustrated by the illustrations of the figures. The disc shape is always flat throughout the overall appearance of an individual part or assembly. The outer delimiting design of the disk shape can then resemble a circular ring segment or a circular ring surface. Several disc-shaped circular ring segments can also be put together to form a pattern, which ultimately forms a circular ring surface. A film or base plate designed as a disk-shaped annular surface has a central recess, clearly in line with the appearance of known axial film bearings. It is also clear that circular ring segments and circular rings define a central recess, which has a central axis around which the circular ring is centered or the circular ring segments can be arranged in a centering manner.

Furthermore, the stack-like structure can be seen in the fact that the disk shapes can be placed one on top of the other and thus stacked to form the axial foil bearing.

The base plate has a disk shape, which is formed from the semi-finished metal foil or sheet metal, and a tab that projects at an angle to the disk-shaped basic shape of the base plate. The angle is to be understood as meaning that the tab is advantageously in one piece from the base plate is formed, but protrudes angularly from the plane delimiting the flatness of the disk shape. A tab protruding at an angle to an outer boundary geometry within the planes delimiting the flatness of the disk shape is not essential to the invention, since only the tab protruding from the delimiting planes engages in the receptacle that is complementary to the tab in order to interact with the cover film Align the corrugated foil and the base plate with each other in the radial direction of the axial foil bearing. In this respect, angular configurations of the tab are also included, which do not protrude in a straight line, but can also form an arcuate tab.

One embodiment of the invention provides that the complementary receptacles engage with the first tab in such a way that rotation of the cover film relative to the corrugated film in both circumferential directions is excluded. The twist can be seen around the central axis of the central, circular recess of the two films. In this way, in addition to the inventive alignment of the stacked structure in the radial direction, the alignment in both circumferential directions is also advantageously ensured and twisting of the films relative to one another is prevented.

In an advantageous embodiment of the invention, there is a second tab on the axial foil bearing, which blocks a degree of freedom around the first tab. The second tab completes the blocking of the degrees of freedom. This ensures a holistic alignment and securing of the stacking package for transport and during operation of the axial foil bearing.

The second tab can be located on one of the components of the axial foil bearing. The base plate, the corrugated film or the cover film can be used for this. If the first and second tabs are located on different components, the component can have both a first tab and the complementary receptacle for the second tab of another component.

For example, the base plate can have the first tab and the corrugated film and the cover film can have the complementary receptacle for this first tab. Furthermore, either the corrugated film or the cover film can have the second tab, with the corresponding complementary receptacle for the second tab from the base plate and/or the other film can be formed. It has advantageously been found that the base plate should have both the first and the second tab.

In the development of the advantageous embodiment, the second tab is also formed by the base plate and protrudes angularly from the base plate in such a way that the second tab engages both in a further complementary receptacle of the cover film and in a further complementary receptacle of the corrugated film. The base plate, which is more stable than the corrugated film and cover film, therefore has a first and a second tab, which preferably protrude angularly from the base plate in the same orientation, so that the complementary receptacles of the corrugated film and cover film can come into engagement with the respective tab. This simplifies assembly to produce the stack-like structure, since the corrugated and cover film can be placed (stacked) on the base plate from a common assembly direction and the tabs secure the degrees of freedom. During assembly, it also allows the possibility of first providing the cover film, placing the corrugated film on the cover film and finally placing the base plate on the package, or stacking the corrugated film starting with the base plate and then stacking the cover film.

In one embodiment, the second tab is designed to prevent the individual foils of the axial foil bearing from rotating. A possible unintentional possibility of rotation around the first tab is thus prevented and the assembled axial foil bearing is reliably mounted using a further measure so that the cover foil remains in overlap with the corrugated foil.

Preferably, the first tab connects the foils to each other and to the base plate firmly to form an operational axial foil bearing. First, the foils rest on the base plate due to gravity and are placed oriented towards each other by the tab with the complementary holder. In order to further improve handling, at least the first tab is bent from the angled, protruding design in such a way that the stack-like structure is also secured in the axial direction (along the central axis). This makes it possible Turn the thrust foil bearing without it falling apart, allowing it to be further processed on the assembly line.

In a further embodiment of the invention, the base plate has at least one first recess on its outer edge for the engagement of a first fastening element in order to fasten the axial foil bearing to a unit by means of the first fastening element. The first recess is designed as a radial fastening tab which extends beyond the distinctive outer edge of the base plate in the radial direction and which provides the first recess for engagement of the first fastening element. This fastening tab is different from the first or second tab. The fastening tab is preferably formed in one piece with the base plate. The fastening tab allows a first fastening element to engage in this, and thus also in the first recess, in order to firmly connect the axial foil bearing to the unit at least at one point.

The base plate can thus have further recesses on its outer edge for the engagement of further fastening elements, the play between the further fastening elements in the respective further recesses being greater than the play of the first fastening element in the first recess. These further recesses are formed in an analogous manner to the fastening tab described above, each with its own additional fastening tabs. However, the plurality of fastening tabs, their recesses and the engageable fasteners are designed such that one pair of fastening tab and its fastening element provides only axial fastening, another pair of fastening tab and its fastening element with a tighter circumferential clearance than the other pairs is provided to ensure peripheral positioning.

Alternatively, the play between the further fastening elements in the respective further recesses can be largely, in special cases exactly, the same size as the play of the first fastening element in the first recess. Three pairs of fastening tabs and fastening elements are advantageously provided so that the axial foil bearing can be fastened to the unit in a well-centered manner.

A second solution according to the invention of the axial foil bearing with at least one cover foil and at least one corrugated foil, the cover foil and the corrugated foil being arranged in a layered, stack-like structure to form the axial foil bearing, and the cover foil and the corrugated foil each having a disk-shaped basic shape, provides that the corrugated foil is formed from a metal foil or a sheet of metal and has a first tab which projects at an angle to the disk-shaped basic shape of the corrugated foil and which engages in a complementary receptacle of the cover foil in order to ensure that the cover foil and the corrugated foil are relative to one another in the radial direction of the axial foil bearing for the layered structure of the axial foil bearing align so that the cover film covers the corrugated film in the stacking direction for reliable operation of the axial film bearing.

Alternatively, in this second solution according to the invention of the axial foil bearing, the first tab can be formed from the cover foil instead of the corrugated foil.

In contrast to the previous solution variant, the tab is now formed directly on the corrugated film, which would advantageously mean that the base plate could now be dispensed with.

This provides an embodiment of the second solution according to the invention, which allows the complementary receptacle to engage with the first tab in such a way that twisting of the cover film relative to the corrugated film in both circumferential directions is excluded.

In an advantageous embodiment of the invention, there is a second tab on the axial foil bearing, which blocks a degree of freedom around the first tab. This means that the stacking package is secured holistically, now only consisting of a cover film and corrugated film for transport and during operation of the axial film bearing. The second tab completes the locks Degrees of freedom. This ensures a holistic alignment and securing of the stacking package for transport and during operation of the axial foil bearing.

The second tab can be located on one of the components of the axial foil bearing. In the second solution variant according to the invention, only the corrugated film or the cover film come into question. If the first and second tabs are located on different components, the component can have both a first tab and the complementary receptacle for the second tab of another component.

For example, the corrugated film can have the first tab and the cover film can have the complementary receptacle for this first tab. Furthermore, the cover film can then have the second tab, wherein the corresponding complementary receptacle for the second tab can be formed by the corrugated film. It has advantageously been found that the corrugated film should have both the first and the second tab.

In the further development of the advantageous embodiment, the second tab is also formed by the corrugated film and protrudes angularly from the corrugated film in such a way that the second tab engages in a further complementary receptacle of the cover film. The corrugated film thus has a first and a second tab, which preferably protrude angularly from the corrugated film in the same orientation, so that the complementary receptacle of the cover film can come into engagement with the respective tab. This makes assembly easier, not only for producing the stack-like structure, since the corrugated and cover film can be placed (stacked) from a common assembly direction and the tabs secure the degrees of freedom. During assembly, it also allows the possibility of first providing the cover film, placing the corrugated film on the cover film and, starting with the corrugated film, stacking the cover film on the corrugated film.

In one embodiment, the second tab is designed to prevent the individual foils of the axial foil bearing from rotating. A possible unintentional possibility of twisting around the first tab is thus prevented and that The assembled axial foil bearings are reliably mounted with another measure so that the cover foil remains in line with the corrugated foil.

Preferably, the first tab firmly connects the foils to one another to form an operational axial foil bearing. First, the foils rest on each other due to their gravity and are placed oriented towards each other by the tab with the complementary receptacle. In order to further improve handling, at least the first tab is bent from the angled, protruding design in such a way that the stack-like structure is also secured in the axial direction (along the central axis). This allows the axial foil bearing to be turned over without it falling apart, which means it can be further processed on the assembly line.

In a further embodiment of the invention, the corrugated film has at least one first recess on its outer edge for the engagement of a first fastening element in order to fasten the axial film bearing to a unit by means of the first fastening element. The first recess is designed as a radial fastening tab which extends beyond the distinctive outer edge of the base plate in the radial direction and which provides the first recess for engagement of the first fastening element. This fastening tab is different from the first or second tab. The fastening tab is preferably formed in one piece with the corrugated film. The fastening tab allows a first fastening element to engage in this, and thus also in the first recess, in order to firmly connect the axial foil bearing to the unit at least at one point.

The corrugated film can therefore have further recesses on its outer edge for the engagement of further fastening elements, the play between the further fastening elements in the respective further recesses being greater than the play of the first fastening element in the first recess. These further recesses are formed in an analogous manner to the fastening tab described above, each with its own additional fastening tabs. However, the plurality of fastening tabs, their recesses and the engageable fasteners are designed to be a pair Fastening tab and its fastening element only provides axial attachment, another pair of fastening tab and its fastening element is provided with a tighter circumferential clearance than the other pairs to ensure circumferential positioning.

Alternatively, the play between the further fastening elements in the respective further recesses can be largely, in special cases exactly, the same size as the play of the first fastening element in the first recess.

Three pairs of fastening tabs and fastening elements are advantageously provided so that the axial foil bearing can be fastened to the unit in a well-centered manner.

Advantageous embodiments of the solution according to the invention are shown in the figures. Show it

1 shows an axial foil bearing according to the invention in its first variant in an exploded view,

2 shows the axial foil bearing according to FIG. 1 in the stacked state with the illustration of the fastening elements,

3a shows the axial foil bearing according to FIG. 1 in a detailed view with the axial securing by the first and second tabs,

3b shows the axial foil bearing according to FIG. 1 in a detailed sectional view,

4 shows the axial foil bearing according to FIG. 1 with the variants of the recesses for the fastening elements,

5 shows the axial foil bearing according to FIG. 1 with the first tab only on its outer circumference,

6 an axial foil bearing according to the invention in its second variant in an exploded view with the illustration of the fastening elements,

7a shows the axial foil bearing according to FIG. 1 with the variant of a differently designed corrugated foil and a differently placed first and second complementary receptacle in an exploded view,

7b shows the axial foil bearing according to FIG. 7a in the assembled state, Fig. 7c shows the axial foil bearing according to Fig. 7b with completely bent tabs and

Fig. 7d shows the axial foil bearing according to Fig. 7c in the finished state after the inner and outer edges of the bearing have been removed.

Fig. 1 shows an axial foil bearing 1 according to the invention in its first variant in an exploded view. The axial foil bearing 1 has a base plate 4, a corrugated foil 3 and a cover foil 2, each of which is disk-shaped and has a circular ring shape. The circular ring shape also defines both the central recess 16 and the central axis 17 for all three components. In the illustration according to FIG. 1, the three components are arranged coaxially to the central axis 17. The stack-like structure is also clearly visible, starting with the base of the base plate 4, lying above it and covering the base plate 4 is the corrugated film 3, which in turn is covered by the cover film 2 arranged above the corrugated film 3, provided that the axial film bearing 1 is shown in the exploded view in is transferred to the next manufacturing state, in which all three components lie on top of each other like a stack, as shown in Figure 2.

So that the three components 4, 3 and 2 can be brought together in the stack-like structure, the three components 4, 3 and 2 are connected via a first tab 7, which is inserted both into a first receptacle 6 of the corrugated film 3 and into the first receptacle 5 the cover film 2 intervenes. For this purpose, the first tab 7 projects angularly from the base plate 4 and is formed in one piece. Optimally, the angular protrusion is oriented in the same direction as the stacking direction 8, so that when the corrugated film 3 and the cover film 2 are joined along the central axis 17 and the stacking direction 8 onto the base plate 4, the first tab 7 engages with the first receptacles 6 and 5 comes. As a result of the engagement, the three components 4, 3 and 2 are aligned with one another in the radial direction (in relation to the central axis 17).

The first tab 7 is arranged on the outer circumference of the base plate 4. This means that the first receptacles 6 and 5 are also arranged on the outer circumference of the corrugated film 3 or the cover film 2 and do not have a closed, circumscribed shape, but are open radially outwards - the first receptacles 6 and 5 are therefore located radially outwards in this exemplary embodiment no further material boundary and therefore has the appearance of a notch. Each first receptacle 6 and 5 thus represents a complementary receptacle for the first tab 7, since the tab 7 is fitted into a first receptacle 6 or 5 when engaging in order to block the radial, translational degree of freedom in one direction.

Consequently, with the sole first tab 7, the corrugated film 3 and the cover film 2 can only be fixed in the radial direction away from the central axis 17. So that the degree of freedom can now also be blocked in the radial direction towards the central axis 17, the base plate 4 has a second tab 9 on the circumferential surface surrounding the central recess 16 of the base plate 4. Furthermore, for the engagement of the second tab 9, the corrugated film 3 and the cover film 2 each also have a further receptacle 11 or 10 on the circumferential lateral surface delimiting the central recess 16 of the film 3 or 2, which are designed to be complementary and therefore suitable for the second tab 9 to lock the radial, translational degree of freedom in the other direction.

The first tab 7 and the second tab 9 are advantageously arranged on an imaginary beam line starting from the central axis 17, that is to say they are not mutually offset in the circumferential direction. Clearly, as an alternative to this, the first tab 7 can be arranged offset from the second tab 9 in the circumferential direction around the central axis 17.

Preferably, the engagement of the first tab 7 and/or the second tab 9 in their complementary receptacles 6 and 5 or in their further complementary receptacles 11 and 10 is such that the degree of freedom in the circumferential direction around the central axis 17 (both directions) is also blocked can be in which the first and / or second tab 7, 8 is in peripheral contact with the complementary receptacle 6, 5 or 11, 10.

Furthermore, further first tabs 7 can be present distributed over the outer circumference of the base plate 4. Accordingly, the corrugated film 3 and the cover film 2 have corresponding complementary receptacles 6, 5, which are congruent are distributed on the outer circumference of the corrugated film 3 and the cover film 2. The distribution of several first tabs 7 over the outer circumference is advantageously regularly following a pattern, so that the distance in radians between two successive first tabs 7 within the pattern is always the same. Of course, as an alternative to this, a chaotic pattern of first tabs 7 may also be conceivable.

In addition, further second tabs 9 can also be present distributed over the inner circumference, which corresponds to the circumferential surface of the base plate 4 delimiting the central recess 16. Accordingly, the corrugated film 3 and the cover film 2 have corresponding additional complementary receptacles 11, 10, which are distributed in a congruent manner on the inner circumference of the corrugated film 3 and the cover film 2. The distribution of several second tabs 9 over the inner circumference is advantageously regularly following a pattern, so that the distance in radians between two successive second tabs 9 within the pattern is always the same. Of course, as an alternative to this, a chaotic pattern of second tabs 9 may also be conceivable.

The base plate 4 also has a first recess 12 on its outer circumference, which is suitable for the engagement of a first fastening element 13 (not shown here). The first recess 12 is circular in this exemplary embodiment - as a bore. Preferably, the corrugated film 3 and the cover film 2 each have a first recess 12 on their outer circumferences, each of which has a shape identical to the first recess 12 of the base plate 4. So all three first recesses 12 of the components 4, 3 and 2 can be penetrated by the same first fastening element 13, and the assembly of the axial foil bearing 1 can be fastened to an aggregate by the first fastening element 13. The recesses 12 of the components 4, 3 and 2 are placed one after the other in the stacking direction 8.

If the first and/or the second tab 7, 9 is not assigned a circumferentially defined system for blocking a circumferential degree of freedom, this function can be taken over by the first recess 12, as shown in the following Figure 2. Furthermore, in addition to the first recess 12, a further recess 14 can be provided on the outer circumference of the base plate 4, which can be penetrated by its own further fastening element 15 (not shown here). In an analogous manner to the recess 12, there is also a further recess 14 on the outer circumferences of the corrugated film 3 and the cover film 2. The recesses 14 are also arranged one after the other in the stacking direction so that all three recesses 14 can be penetrated by the same additional fastening element 15 to attach the axial foil bearing 1 to the unit.

Fig. 2 shows the axial foil bearing 1 according to Fig. 1 in the stacked state with the illustration of the fastening elements 13 and 15, the three components 4, 3 and 2 resting on one another in the order known from Figure 1.

The fastening elements 13 and 15, shown schematically as cylinders, pass through their respective first and further recesses 12 and 14. For this purpose, both the cover film 2 and the corrugated film 3 also have at least the first recesses 12, which are brought into coincidence. Clearly, the cover film 2 and the corrugated film 3 can also have the further recesses 14.

The first and second tabs 6, 9 have not yet been completely bent, so that the stacked films 2, 3 cannot yet be held together in the axial direction (stacking direction 8).

Fig. 3a shows the axial foil bearing 1 according to Fig. 1 in a detailed view with the axial securing by the first and second tabs 7 and 9. The completed engagement of the first and second tabs 7 and 9 with the complementary receptacles 5, 6 is also well illustrated and 10, 11, whereby the tabs 7 and 9 have finally been bent over in such a way that the foils 2 and 3 are secured axially (along the central axis 17) on the base plate 4 and the axial foil bearing 1 can no longer fall apart. For this purpose, the first tab 7 was bent towards the central axis 17 or the central recess 16, while the second tab 9 was bent from the central axis 17 or from the central recess 16 has been bent away. The tabs 7 and 9 have thus been bent towards each other in order to ensure the axial securing of the components 4, 3 and 2 of the axial foil bearing 1. This has the advantage that the circular ring shape of foils 2 and 3 is securely encompassed.

Fig. 3b shows the axial foil bearing 1 according to Fig. 1 in a detailed sectional view. This shows that the first tab 7 in the bent state has an overlap with the cover film 2 and is in engagement with the complementary receptacles 5 and 6. The cover film 2 is held by the first tab 7 and the cover film 2, with its overlap with the corrugated film 3, in turn holds the corrugated film 3 on the base plate 4.

The space available between the first tab 7 in the area of the film thickness of the films 2 and 3 to the films 2 and 3 itself leaves sufficient play so that, on the one hand, the coverage of the films 2 and 3 and thus their functionality are not impaired and, on the other hand, the Determination in the radial direction takes place within the framework of a limit with play. This is necessary so that foils 2 and 3 do not bend or otherwise be affected during operation due to temperature fluctuations.

Fig. 4 shows the axial foil bearing 1 according to Fig. 1 with the variants of the recesses 12 and 14 for the fastening elements 13 and 15. The recess 12 is U-shaped, whereas the further recess 14 is designed as a circular shape. When attaching the axial foil bearing 1 to the unit, the additional circular recess 14 therefore has the function of first aligning the bearing 1 on the unit or fixing it at a point. Via the U-shaped recess 12, the bearing is then prevented from rotating around the further fastening element 15, in which only the flanks of the U-shape rest on the fastening element 13. As a result, the common central axis 17 is formed by the individual components 4, 3, 2.

Fig. 5 shows the axial foil bearing 1 according to Fig. 1 with the first tab 7 only on its outer circumference. Several first tabs 7 distributed on the outer circumference simultaneously engage in complementary receptacles 5, 6 provided specifically for each and thus secure the foils 2, 3 to each other and on the base plate 4, so that the central axis 17 of each of the components 2, 3 and 4 forms a common central axis 17 and thus the radial alignment of the foils 2 and 3 to one another and to the base plate 4 is achieved.

Fig. 6 shows an axial film bearing 21 according to the invention in its second variant in an exploded view with the illustration of the fastening elements 33 and 35. The first receptacle 32 and the further receptacle 34 are formed by the corrugated film 23, which is distributed both on the inner circumference and on the outer circumference first and second tabs 27 and 29 according to the invention in analogy to the embodiment of the aforementioned figures. The cover film 22 has the corresponding complementary receptacles 25 and further complementary receptacles 30 on both the inner circumference and the outer circumference. The base plate is omitted in this embodiment, since the elements for aligning and connecting are now formed directly by the corrugated film 23.

The fastening elements 33 and 35, shown schematically as cylinders, pass through their respective first and further recesses 32 and 34. For this purpose, both the cover film 22 and the corrugated film 23 also have at least the first recesses 32, which are brought into alignment. Clearly, the cover film 22 and the corrugated film 23 can also have the further recesses 34.

The first and second tabs 27, 29 have not yet been fully bent, so that the stacked films 22, 23 cannot yet be held together in the axial direction (stacking direction 28).

7a shows the axial foil bearing 1 according to FIG. 1 with the variant of a differently designed corrugated foil 3 and a differently placed first and second complementary receptacle 6 and 11 in an exploded view. The special feature of this embodiment is that not only the corrugated film 3 is designed differently, but also the cover film 2. Both films 2, 3 now each have an additional inner and outer edge 18a, 19a. The inner edge 18a is connected to the corresponding film 2, 3 via inner webs 18b. The outer edge 19a is connected to the corresponding film 2, 3 via webs 19b. The connection of the edges 18a, 19a via the webs 18b, 19b stabilizes the corresponding film 2, 3 Individual part when stacked on the base plate 4. The base plate 4 has the first and second tabs 7 and 9 in the aforementioned manner. The placement of the corresponding complementary and further complementary receptacles 5, 6 and 10, 11 of the foils 2, 3 are now between the inner and outer edges 18a, 19a, with the receptacles 5, 6, 10, 11 continuing to have the shape of the notch , as in the preceding descriptions of the receptacles 5, 6, 10 and 11. The first and second tabs 7 and 9 can continue to engage in these receptacles 5, 6, 10 and 11 and can continue to hold the respective film 2, 3 in the radial Align position and can still be bent after components 2, 3 and 4 have been stacked and assembled to ensure axial securing. In addition to the axial securing, the first and second tabs 7 and 9 also effect a radial and circumferential reliable positioning and securing of the components 2, 3 and 4 to one another.

Fig. 7b shows the axial foil bearing 1 according to Fig. 7a in the assembled state. The three components 4, 3 and 2 lie on one another in the order known from FIG. 7a. It is clearly visible that the outer edge 19a covers both the receptacle 12 and the further receptacles 14, so that in this state no fastening element can protrude through the receptacle 12 or the further receptacle 14.

Fig. 7c shows the axial foil bearing 1 according to Fig. 7b with completely bent tabs 7 and 9. To axially secure the stacking package, the first and second tabs 7 and 9 were bent radially inwards and radially outwards and lie against the cover foil 2.

Fig. 7d shows the axial foil bearing 1 according to Fig. 7c in the finished state after the inner and outer edges 18a and 19a of the bearing 1 have been removed. After the first and second tabs 7 and 9 have been bent over so that they lie flat against the cover film 2 and axially secure the stack package, the edges 18a and 19a can be removed. The edges 18a and 19a are separated via the separation on the webs 18b and 19b. Ideally, the webs 18b, 19b were completely removed. The functionally relevant stabilization for the individual part through the webs 18b, 19b and the edges 18a, 19a is achieved after the bending first and second tabs 7 and 9 are no longer needed. This was taken over by the bent tabs 7 and 9, which now hold the axial foil bearing 1 together as an assembly. With the removal of the edges 18a, 19a, in particular the outer edge 19a, the receptacle 12 and the further receptacle 14 become accessible for the fastening element 13, 15. The axial foil bearing 1 is now in delivery condition and can be connected to the unit.

List of reference symbols Axial foil bearing Cover foil Corrugated foil Base plate Receptacle (of the cover film) Receptacle (of the corrugated film) First tab Stacking direction Second tab Further receptacle (of the cover film) Further receptacle (of the corrugated film) First recess First fastening element Further recess Further fastening element Central recess Central axis a Inner edge b Inner web a outer edge b outer web axial foil bearing cover foil corrugated foil - holder (of the cover foil) - first tab

Stacking direction second tab further receptacle (of the cover film) first recess first fastening element further recess further fastening element central recess central axis

Claims

Patent claims

1 . Axial foil bearing (1) with at least one cover foil (2), at least one corrugated foil (3) and a base plate (4), the cover foil (2), the corrugated foil (3) and the base plate (4) being in a layered, stack-like structure Formation of the axial foil bearing (1) are arranged, and the cover foil (2), the corrugated foil (3) and the base plate (4) each have a disk-shaped basic shape, characterized in that the base plate (4) is formed from a metal foil or a sheet of metal and has a first tab (7) which projects at an angle to the disk-shaped basic shape of the base plate (4) and which engages both in a complementary receptacle (5) of the cover film (2) and in a complementary receptacle (6) of the corrugated film (3). For the layered structure of the axial foil bearing (1), align the cover foil (2), the corrugated foil (3) and the base plate (4) with one another in the radial direction of the axial foil bearing (1), so that in the stacking direction (8) the cover foil (2) corresponds to the corrugated foil (3) for reliable operation of the axial foil bearing (1).

2. Axial film bearing (1) according to claim 1, wherein the complementary receptacles (5, 6) engage with the first tab (7) in such a way that the cover film (2) can be rotated to the corrugated film (3) in both circumferential directions central axis (17) is excluded.

3. Axial foil bearing (1) according to claim 1 or 2, wherein a second tab (9) exists on the axial foil bearing (1), which blocks a degree of freedom around the first tab (7).

4. Axial foil bearing (1) according to claim 3, wherein the second tab (9) is formed by the base plate (4) and protrudes angularly from the base plate (4) so that the second tab (9) both in a further complementary receptacle ( 10) of the cover film (2) as well as in a further complementary receptacle (11) of the corrugated film (3). Axial foil bearing (1) according to one of claims 3 or 4, wherein the second tab (9) is designed to prevent rotation of the individual foils (2, 3) of the axial foil bearing (1). Axial foil bearing (1) according to one of the preceding claims, wherein the first tab (7) firmly connects the foils (2, 3) to one another and to the base plate (4) to form an operational axial foil bearing (1). Axial foil bearing (1) according to one of the preceding claims, wherein the base plate (4) has at least one first recess (12) on its outer edge for engaging a first fastening element (13) in order to secure the axial foil bearing (1) to an aggregate by means of the first fastening element (13) to be attached. Axial foil bearing (1) according to one of the preceding claims, wherein the base plate (4) has further recesses (14) on its outer edge for engaging further fastening elements (15), the play between the further fastening elements (15) in the respective further recesses ( 14) can be larger than the play of the first fastening element (13) in the first recess (12). Axial foil bearing (21) with at least one cover foil (22) and at least one corrugated foil (23), the cover foil (22) and the corrugated foil (23) being arranged in a layered, stack-like structure to form the axial foil bearing (21), and the cover foil (22) and the corrugated foil (23) each have a disk-shaped basic shape, characterized in that the corrugated foil (23) is formed from a metal foil or a sheet of metal and has a first tab (27) which projects at an angle to the disk-shaped basic shape of the corrugated foil (23). , which engages in a complementary receptacle (25) of the cover film (22) in order to connect the cover film (22) and the corrugated film (23) to one another for the layered structure of the axial film bearing (21). radial direction of the axial foil bearing (21) so that in the stacking direction (28) the cover foil (22) covers the corrugated foil (23) for reliable operation of the axial foil bearing (21).

10. Axial film bearing (21) according to claim 9, wherein the complementary receptacle (25) engages with the first tab (27) in such a way that rotation of the cover film (22) to the corrugated film (23) in both circumferential directions is excluded.

11 .Axial foil bearing (21) according to claim 9 or 10, wherein a second tab (29) exists on the axial foil bearing (21), which blocks a degree of freedom around the first tab (27).

12. Axial foil bearing (21) according to claim 11, wherein the second tab (29) is formed by the corrugated foil (23) and protrudes angularly from the corrugated foil (23) so that the second tab (29) fits into a further complementary receptacle (30 ) of the cover film (22) intervenes.

13. Axial foil bearing (21) according to one of claims 11 or 12, wherein the second tab (29) is designed to prevent rotation of the individual foils (22, 23) of the axial foil bearing (21).

14. Axial foil bearing (21) according to one of the preceding claims 9 to 13, wherein the first tab (27) firmly connects the foils (22, 23) to one another to form an operational axial foil bearing (21).

15. Axial foil bearing (21) according to one of the preceding claims 9 to 14, wherein the corrugated foil (23) has at least one first recess (32) on its outer edge for engaging a first fastening element (33) in order to secure the axial foil bearing (21) to a Attach the unit using the first fastening element (33).

16. Axial foil bearing (21) according to one of the preceding claims 9 to 15, wherein the corrugated foil (23) has further recesses on its outer edge (34) for engaging further fastening elements (35), wherein the play between the further fastening elements (35) in the respective further recesses (34) can be greater than the play of the first fastening element (33) in the first recess (32).