Radial foil bearing for fastening corrugated and cover foil in outer ring by means of curved hooks

Abstract

According to the invention, a radial foil bearing (1) is proposed, in which each arc-shaped section (6a) is fastened to an outer ring (5) by means of at least one web (11) of the respective cover foil (2a) and / or of the respective corrugated foil (3a), said web being bent from a flat initial shape, in which outer ring the web engages in a receptacle (12) at an end face (16, 17) of the outer ring. According to the invention, an arc-shaped section of such a radial foil bearing is also proposed, in which additional webs are formed on the cover foil and / or the corrugated foil, said additional webs fixedly connecting the two corresponding foils to each other to form an arc-shaped section.

Description

Technical Field

[0001] Radial foil bearings are provided for the aerodynamic support of a shaft, wherein a load-bearing gas cushion is formed between the shaft and the radial foil bearing. The mode of operation is similar to that of a hydrodynamic plain bearing, but the difference is that the shaft is supported by the radial foil bearing via an air cushion and not by a liquid cushion as in a hydrodynamic plain bearing. The common point of both modes of operation is that the rotational movement of the shaft causes the formation of the load-bearing cushion.

[0002] Foil bearings differ from conventional aerodynamic bearings in the flexible, elastic arrangement between the rotating shaft and the stationary housing component. Due to this feature, foil bearings, although less rigid than conventional air bearings, can nevertheless adapt to geometric air gap changes caused by, for example, misalignment of the bearing seat or different thermal expansions of the shaft and housing, thereby achieving in practice a higher operational reliability in many applications.

[0003] In order to form a load-bearing air cushion, radial foil bearings usually have a cover foil in contact with the stationary shaft and a corrugated foil arranged radially between the cover foil and the outer ring of the bearing, which can be elastically compressed in the radial direction. In principle, the radial foil bearing therefore has two foils in contact with each other and an outer ring that carries the foil, whereby the radial foil bearing can be accommodated in a housing. The outer ring can also be formed in one piece by the housing, into which the foil of the radial foil bearing is inserted.

[0004] If the shaft is set into rotational motion relative to the radial foil bearing, the air present in the air gap defined by the stationary state is compressed. Starting from a certain rotational speed of the shaft, an air cushion is formed between the cover foil and the shaft, on which the shaft can slide. In this case, the foil pack with its corrugated foil and its radial spring action ensures that fluctuations in the air pressure or vibrations of the shaft in the radial direction do not damage the bearing, thereby keeping the air cushion load-bearing. Background Art

[0005] Foil bearings are known in the prior art in a variety of designs. In addition to radial foil bearings, there are also axial foil bearings that can be designed with axial load-bearing capacity. The arrangement of the foils of the bearings and their geometrical design are varied and are adapted to each application.

[0006] US2015 / 292552A and US2011 / 052110A respectively show the construction schemes of radial foil bearings. Summary of the invention

[0007] The object of the present invention is to construct an improved radial foil bearing.

[0008] The radial foil bearing according to the invention has a plurality of, preferably three, arc segments, wherein there is a first arc segment, which is composed of a first cover foil and a first corrugated foil fixedly connected to each other at a common end, wherein there is a second arc segment, which is composed of a second cover foil and a second corrugated foil fixedly connected to each other at a common end, wherein there is a third arc segment, which is composed of a third cover foil and a third corrugated foil fixedly connected to each other at a common end, and the three arc segments are fastened in the outer ring. Thus, the arc segment is formed by only one cover foil and only one corrugated foil, which are fixedly connected to each other at a common end. The arc segments are fixedly connected to each other indirectly and / or directly at the ends.

[0009] The radial foil bearing according to the invention can therefore be preferably used for oil-free and rapidly rotating rotor supports, for example in fuel cell compressors, electric boosters or turbochargers, wherein the design according to the invention of the radial foil bearing allows large-scale production that is as cost-effective as possible and furthermore provides the possibility of modular construction in order to meet different requirements with regard to the realization of radial foil bearings in complete plant components.

[0010] Within the scope of the invention, the cover foil and / or the corrugated foil of the arc segment has at its boundary surface limiting its axial dimension at least one web protruding from the boundary surface, which serves as a fastening means for inserting the arc segment into the outer ring in order to complete the radial foil bearing.

[0011] In this case, the limiting surface is not any surface of the foil which delimits any axial dimension in the sense of a contour—rather, it is a surface which delimits the axial extent as a side contour of the envelope and as a linearly extending separating straight line.

[0012] However, before the bending process for fastening is carried out, at least one tab projects in the axial direction beyond the axial extent of the cover foil or the corrugated foil. The at least one tab can also project in the axial direction beyond the axial extent of the outer ring limited by its end face and be bent into its finished shape only at the end of the assembly process in order to hold the arc section in the outer ring.

[0013] Advantageously, a plurality of tabs are formed by the cover foil and / or the corrugated foil. The minimum required is already a single tab according to the invention of the cover foil and / or the corrugated foil. At least one tab engages in a notch or another receptacle of the corresponding other foil and at least one tab secures the arc segment formed by the two foils at the outer ring, wherein the corresponding tab engages in its suitable receptacle of the outer ring, whereby the arc segment is oriented and secured in an angularly adapted manner within the outer ring. Particularly preferably, a coupling pair consisting of a tab and a receptacle is present on each end face of the outer ring, wherein the angularly adapted orientation and positioning of the arc segment at the outer ring is ensured by means of each coupling pair. This not only ensures an anti-twist lock between the arc segment and the outer ring, but also prevents the arc segment from axially moving out of the outer ring during operation of the radial foil bearing.

[0014] In an advantageous embodiment of the invention, at least one web protrudes in the axial direction beyond the axial dimension of the arc-shaped section.

[0015] The outer ring is advantageously present as a separate and independent component which can be inserted into a receiving bore of the housing.

[0016] In another embodiment, at least one tab protrudes in the axial direction beyond the axial dimension of the outer ring limited by its end face before the installation is completely completed. At least one tab of the arc segment installed in the outer ring is thus accessible from the outside so as to be bent into the receptacle of the outer ring and to complete the installation so as to securely hold the arc segment in the outer ring.

[0017] Alternatively, before the arc section was installed in the outer ring, at least one tab could be pre-bent in a hook shape. In this case, the hook tab is snapped into the receiving portion provided for this purpose of the outer ring after successful installation and the arc section is locked in the outer ring.

[0018] In a particularly advantageous embodiment, at least one tab engages in a radial direction in a corresponding receptacle of the outer ring provided for the at least one tab. After the arcuate section has been successfully engaged in the outer ring, the at least one tab is bent radially outwards so that it can engage in the receptacle. The bending of the at least one tab into a hook is preferably carried out at an angle of approximately 90°. Subsequently, the arcuate section is fixed and mounted in a radial direction on the outer ring.

[0019] Advantageously, the circumferential side faces of the bent web together with the circumferential boundary surfaces of the receptacle enable the arc-shaped section to be locked against rotation in the circumferential direction in the outer ring.

[0020] Advantageously, the receptacle is set back into the material at the end face of the outer ring. This saves axial installation space and protects the webs of the foil from damage during handling or transportation of the radial foil bearing until the bearing is installed in the housing bore.

[0021] In another embodiment of the invention, the receptacle is also set back into the material at the outer surface of the outer ring in addition to the setback configuration at the end face. Advantageously, two bent webs engage in the axially and radially setback receptacles and lock the arcuate section in two axial directions.

[0022] The engagement of the bent web into the radially set-back receptacle or the receptacle expansion also ensures that no part of the web protrudes into the envelope surrounding the outer surface of the outer ring and prevents the outer ring from being installed in the receptacle bore of its housing. The web in the receptacle is therefore bent without protrusion both toward the outer surface and toward the end face.

[0023] According to the invention, an arcuate segment of the radial foil axis is also provided, wherein a web can firmly connect the arcuate segment to the outer ring and further webs are formed by the cover foil and / or the corrugated foil, which firmly connect the two corresponding foils to each other. Thus, the arcuate segment can be present as a preassembled unit of two foils and is ready for integration into the outer ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Advantageous embodiments of the present invention are described in detail in the following drawings. The drawings show:

[0025] Figure 1 The outer ring of a first embodiment of a radial foil bearing according to the invention is shown,

[0026] Figure 2 A first variant of a corrugated foil is shown for a first variant of an arcuate segment of a first embodiment of a radial foil bearing according to the invention,

[0027] Figure 3 A first variant of a cover foil for a first variant of an arcuate segment of a first embodiment of a radial foil bearing according to the invention is shown,

[0028] Figure 4 shows a first assembly step for producing a first variant of an arcuate segment for a first embodiment of a radial foil bearing according to the invention,

[0029] Figure 5 shows a second assembly step for producing a first variant of an arcuate segment for a first embodiment of a radial foil bearing according to the invention,

[0030] Figure 6 shows a third assembly step for producing a first variant of an arcuate segment for a first embodiment of a radial foil bearing according to the invention,

[0031] Figure 7 The fourth installation step is shown, wherein according to Figure 6 A first variant of the arcuate segment of is inserted into the outer ring for a first embodiment of the radial foil bearing according to the present invention,

[0032] Figure 8 shows a fifth assembly step, in which all first variants of the arcuate segments are installed in the outer ring, in order to complete the first embodiment of the radial foil bearing according to the invention,

[0033] Fig. 9 shows a fourth assembly step, in which the second variant of the arcuate segment (the second variant with cover foil and corrugated foil) is installed in the outer ring for the second embodiment of the radial foil bearing according to the invention,

[0034] Fig.10 The fifth installation step is shown, wherein according to Fig. 9 The second variant of the arc segment is inserted into the outer ring,

[0035] Fig.11 shows a sixth assembly step, in which all second variants of the arcuate segments are installed in the outer ring, in order to complete the second embodiment of the radial foil bearing according to the invention,

[0036] Fig.12 A third variant of a corrugated foil for use in a third embodiment of a radial foil bearing according to the invention is shown.

[0037] Fig.13 A third variant of a cover foil for a third embodiment of a radial foil bearing according to the invention is shown.

[0038] Fig.14 shows a first assembly step for producing a third variant of an arcuate segment for a third embodiment of a radial foil bearing according to the invention,

[0039] Fig.15 shows a second assembly step for producing a third variant of an arcuate segment for a third embodiment of a radial foil bearing according to the invention,

[0040] Fig.16 shows a third assembly step for producing a third variant of an arcuate segment for a third embodiment of a radial foil bearing according to the invention,

[0041] Fig.17 A fourth assembly step is shown, in which a third variant of the arcuate segment is installed in the outer ring for a third embodiment of the radial foil bearing according to the invention,

[0042] Fig.18shows a fifth assembly step, in which all third variants of the arcuate segments are installed in the outer ring, in order to complete the third embodiment of the radial foil bearing according to the invention,

[0043] Fig.19 A fourth variant of a corrugated foil for a fourth embodiment of a radial foil bearing according to the invention is shown,

[0044] Fig. 20 A fourth variant of the corrugated foil is shown after the first production step,

[0045] Fig.21 A fourth variant of a cover foil for a fourth embodiment of a radial foil bearing according to the invention is shown,

[0046] Fig. 22 shows a first assembly step for producing a fourth variant of an arcuate segment for a fourth embodiment of a radial foil bearing according to the invention,

[0047] Fig.23 shows a second assembly step for producing a fourth variant of an arcuate segment for a fourth embodiment of a radial foil bearing according to the invention,

[0048] Fig.24 shows a third assembly step for producing a fourth variant of an arcuate segment for a fourth embodiment of a radial foil bearing according to the invention,

[0049] Fig.25 shows a fourth assembly step for producing a fourth variant of an arcuate segment for a fourth embodiment of a radial foil bearing according to the invention,

[0050] Fig.26 shows a fifth installation step, in which a fourth variant of the arcuate segment is installed in the outer ring for a fourth embodiment of the radial foil bearing according to the invention,

[0051] Fig. 27 shows a sixth mounting step, in which a fourth variant of the arcuate segment is installed in the outer ring for a fourth embodiment of the radial foil bearing according to the invention, and

[0052] Fig.28 The seventh assembly step shows the installation of all fourth variants of the arcuate segments into the outer ring in order to complete the fourth embodiment of the radial foil bearing according to the invention. DETAILED DESCRIPTION

[0053] Figure 1The outer ring 5 of a first embodiment of a radial foil bearing 1 according to the invention is shown. The outer ring 5 has receptacles 12 on both end faces 16 and 17 which are provided for engaging webs 11 according to the invention which secure the arc-shaped section explained below in the outer ring 5 .

[0054] Figure 2 A first variant of a corrugated foil 3 for a first variant of an arcuate segment 6 of a first embodiment of a radial foil bearing 1 according to the invention is shown. The corrugated foil 3 or 3a has two notches 7 at one end at its boundary surface, which are opposite in the axial direction 8. In addition, the corrugated foil 3 or 3a has an orientation means 19 positioned between the notches 7, which is designed as a drilled or punched hole. Alternatively, this can be a single, punched rectangle, which in the same way can prevent the corrugated foil 3 from twisting by means of engagement of a tool.

[0055] Figure 3 A first variant of a cover foil 2 for a first variant of an arcuate section 6 of a first embodiment of a radial foil bearing 1 according to the invention is shown. The cover foil 2 or 2a has two webs 11 at one end which are arranged opposite each other in the axial direction 8 and which protrude significantly from their boundary surface. In addition, the cover foil 2 or 2a has an orientation means 19 positioned between the webs 11, which is designed as a drilled or punched hole. Alternatively, this can be a single, punched rectangle, which in the same way can prevent the cover foil 2 from twisting by means of engagement of a tool. According to Figure 2 The corrugated foil 3 and according to Figure 3 The orientation means 19 of the cover films 2 are as identical as possible in terms of position and shape.

[0056] Figure 4 The first assembly step for producing a first variant of the arcuate segment 6 for the first embodiment of the radial foil bearing 1 according to the invention is shown. In the first assembly step, the arcuate segment 6 is formed according to the first embodiment of the radial foil bearing 1 according to the invention. Figure 3 The cover foil 2a and the Figure 2 The corrugated foils 3a are aligned with one another by means of a tool, which is represented cylindrically here, in that the cylindrical tool engages in the orientation device 19. The cover foil 2a is located radially inside the corrugated foil 3a, in other words, the corrugated foil 3a surrounds the cover foil 2 in the circumferential direction 10. The two foils 2a and 3a are initially spaced apart from one another.

[0057] Figure 5 The second assembly step for producing the first variant of the arcuate segment 6 for the first embodiment of the radial foil bearing 1 according to the invention is shown. Figure 4, the two foils 2a and 3a are now stacked one on top of the other, so that the orientation means 19 has not lost its overlap. In the illustration, the tool for alignment has been removed again. The tab 11 is now above the notch 7 (which is covered by the tab 11 in the illustration). First, the arc segment 6 or 6a is now ready for further production steps.

[0058] Figure 6 The third assembly step for producing the first variant of the arc segment 6 for the first embodiment of the radial foil bearing 1 according to the invention is shown. The web 11 is now based on Figure 5 The corrugated foil 3a is bent by about 90° and engages in the notch 7. Thus, the notch 7 is Figure 2 Its geometry is designed such that the bent-over web 11 can engage in its recess 7 . The foils 2 a and 3 a of the arc-shaped section 6 a are now locked in the circumferential direction 10 .

[0059] Figure 7 The fourth installation step is shown, in which the first variant of the arc segment 6 is formed according to Figure 6 Load into Figure 1 The arcuate segments 6, 6a are inserted into the outer ring 5 so that the bent webs 11 engage with the first embodiment of the radial foil bearing 1 according to the invention. Figure 1 The arc section 6a is thereby secured in the outer ring 5. The corrugated foil 3a is also clamped between the cover foil 2a and the outer ring 5 so that the corrugated foil 3a can no longer be lost. The securing in the sense of the invention is a locking one. It can additionally be provided with further material-bonding mechanisms.

[0060] Figure 8 The fifth assembly step is shown, in which all first variants of the arc segments 6 are installed in the outer ring 5 in order to complete the first embodiment of the radial foil bearing 1 according to the invention. All arc segments 6a, 6b, 6c according to the template of the arc segments 6 are installed in the outer ring 5 so that there is a tab 11 in each receptacle 12. The three arc segments 6a, 6b, 6c are positioned one after another in the circumferential direction, with the end of one arc segment 6 partially overlapping the beginning of the following arc segment 6. The receptacle 12 is set back from the corresponding end faces 16 and 17 so that no part of the tab 11 protrudes beyond the end face 16 or 17 in the axial direction 8. It is ensured by the orientation of the orientation means 19 and the locking of the orientation means by the engagement of the tab 11 into its recess 7 that no part of the foil 2a, 2b, 2c or 3a, 3b, 3c protrudes beyond the end face 16 or 17. The first embodiment of the radial foil bearing 1 according to the invention is complete and can be transported and installed into a housing bore.

[0061] Fig. 9The fourth assembly step is shown, in which the second variant of the arcuate segment 6 (the second variant with the cover foil 2 and the corrugated foil 3) is inserted into the outer ring 5 for the second embodiment of the radial foil bearing 1 according to the invention. The webs 11 of the second variant of the cover foil 2a are designed to be significantly longer in the axial direction 8 compared to the first variant of the cover foil 2a from the above figure, so that they can protrude beyond the outer side surface 18 after the first bending process, as shown. The receptacle 12 of the outer ring 5 is also designed to be longer than according to the second variant of the radial foil bearing 1 according to the invention. Figure 1 The embodiment of the outer ring 5 is changed so that the groove of the receiving portion 12 is not only set back from the end faces 16 , 17 but also relative to the outer side surface 18 to provide space for a further curvature of the engaging tab 11 .

[0062] Fig.10 The fifth installation step is shown, in which the second variant of the arc segment 6 is formed according to Fig. 9 Installed into the outer ring 5. Based on Fig. 9 The web 11 is now bent a second time by approximately 90° so that it engages in the receptacle 12 both in the region of the end faces 16 , 17 and in the region of the outer surface 18 , thereby enclosing a portion of the outer ring 5 . This additionally achieves a further locking in the radial direction.

[0063] Fig.11 The sixth assembly step is shown, in which all second variants of the arcuate segments 6 are installed in the outer ring 5, so as to complete the second embodiment of the radial foil bearing 1 according to the invention. Fig. 9 All arc segments 6a, 6b, 6c of the longer web 11 of the cover foil 2 according to the template of the arc segment 6 are inserted into the outer ring 5 so that a web 11 is present in each receptacle 12. The three arc segments 6a, 6b, 6c are positioned one after another in the circumferential direction, wherein the end of one arc segment 6 partially overlaps the beginning of the following arc segment 6. The receptacle 12 is set back from the corresponding end faces 16 and 17 and the outer side surface 18 so that no part of the web 11 protrudes beyond the end face 16 or 17 or the outer side surface 18 in the axial direction 8. The orientation of the orientation means 19 and the locking of the orientation means by the engagement of the web 11 into its recess 7 ensure that no part of the foil 2a, 2b, 2c or 3a, 3b, 3c protrudes beyond the end face 16 or 17. The second embodiment of the radial foil bearing 1 according to the invention is complete and can be transported and installed in the housing bore.

[0064] Fig.12A third variant of a corrugated foil 3 for a third embodiment of a radial foil bearing 1 according to the invention is shown. The corrugated foil 3 or 3a has two notches 7 at one end at its boundary surface, which are opposite each other in the axial direction 8. In addition, the corrugated foil 3 or 3a has an orientation means 19 positioned between the notches 7, which is designed as a drilled or punched hole. Alternatively, this can be a single, punched rectangle, which can prevent the corrugated foil 3 from twisting in the same way by means of engagement of a tool. In addition, the third variant of the corrugated foil 3 now has two further tabs 13, which are arranged between the orientation means 19. The two further tabs protrude from the corrugated foil 3 and the axial direction 8 at an angle of approximately 90° and point in the radial direction of the cover foil to be installed later.

[0065] Fig.13 A third variant of a cover foil 2 for a third embodiment of a radial foil bearing 1 according to the invention is shown. The cover foil 2 or 2a has two webs 11 at one end which are arranged opposite each other in the axial direction 8 and which protrude significantly from their boundary surface. In addition, the cover foil 2 or 2a has an orientation means 19 positioned between the webs 11 and which is designed as a drilled or punched hole. Alternatively, this can be a single, punched rectangle which can in the same way prevent the cover foil 2 from twisting by means of engagement with a tool. According to Fig.12 The corrugated foil 3 and according to Fig.13 The orientation means 19 of the cover foil 2 are as identical as possible in terms of position and shape. In addition, the third variant of the cover foil 2 has two further receptacles 14 for engagement with the cover foil 2 according to the present invention. Fig.12 Two further webs 13 of the corrugated foil 3 .

[0066] Fig.14 The first assembly step of the third variant for producing the arcuate segment 6 of the third embodiment of the radial foil bearing 1 according to the invention is shown. In the first assembly step, Fig.13 The cover foil 2a and the Fig.12 The corrugated foils 3a of the cover foil 2a are aligned with each other by means of a tool represented in the form of a cylinder, in that the cylindrical tool engages in the orientation device 19. The cover foil 2a is located radially inside the corrugated foil 3a, in other words, the corrugated foil 3a surrounds the cover foil 2 in the circumferential direction 10. The two foils 2a and 3a are initially spaced apart from each other. The further webs 13 of the corrugated foil 3a and the further receptacles 14 of the cover foil 2a are also oriented in alignment with each other.

[0067] Fig.15 The second assembly step for producing the third variant of the arcuate segment 6 for the third embodiment of the radial foil bearing 1 according to the invention is shown. Fig.14, the two foils 2a and 3a are now placed one above the other, so that the orientation means 19 has not lost its overlap. In this illustration, the tool for alignment has been removed again. The tab 11 is now located above the recess 7 (which is covered by the tab 11 in the illustration). The further tab 13 now engages in the further receptacle 14 and penetrates the cover foil 2a. First, the arc segment 6 or 6a is now ready for further production steps.

[0068] Fig.16 The third assembly step for producing a third variant of the arcuate section 6 for the third embodiment of the radial foil bearing 1 according to the invention is shown. The further web 13 is now bent again by approximately 90° and points in the direction of extension of the web 11. The arcuate functional surface of the cover foil 2a is not affected by the folded-down further web 13, since the contacting area of ​​the further web 13 is set back from the imaginary extension of the functional surface.

[0069] Fig.17 The fourth installation step is shown, in which the third variant of the arcuate segment 6 is installed in the outer ring 5 for the third embodiment of the radial foil bearing 1 according to the invention. Figure 7 and Fig.11 In a similar manner, the arcuate segment 6a with its third variant of cover foil 2a and corrugated foil 3a is installed in the outer ring 5. Here, further webs 13 can also be seen.

[0070] Fig.18 The fifth assembly step is shown, in which all third variants of the arcuate segments 6 are installed in the outer ring 5, so as to complete the third embodiment of the radial foil bearing 1 according to the invention. The engagement of the web 11 into its receptacle 12 is similar to Fig.11 is visible. Fig.17 The visible additional webs 13 are now covered by corresponding adjacent or circumferentially following arc segments 6c. All cover foils 2a, 2b and 2c now also form a functional surface closed on the circumferential side for actuating the shaft to be loaded, as in the previous embodiment of the radial foil bearing 1.

[0071] Fig.19 A fourth variant of a corrugated foil 3 for a fourth embodiment of a radial foil bearing 1 according to the invention is shown. The fourth variant of the corrugated foil 3 now has a tab 11 for fastening to the outer ring 5. In the previous embodiment, the tab 11 was arranged on the cover foil 2. In addition, the corrugated foil 3 or 3a has an orientation means 19 positioned between the notches 7, similar to the previous variants, which is designed as a drilled or punched hole. Alternatively, this can be a single, punched rectangle, which in the same way can prevent the corrugated foil 3 from twisting by means of engagement of a tool.

[0072] Fig. 20 Shown after the first manufacturing step Fig.19 4. The tabs 11 are now bent out of their original position by approximately 90°. The tabs protrude from the corrugated foil 3 and the axial direction 8 at an angle of approximately 90° and point in the radial direction of the cover foil to be mounted later.

[0073] Fig.21 A fourth variant of a cover foil 2 for a fourth embodiment of a radial foil bearing 1 according to the invention is shown. The cover foil 2 or 2a has two notches 7 at one end at its boundary surface, which are opposite each other in the axial direction 8. In addition, the cover foil 2 or 2a has an orientation means 19 positioned between the notches 7, which is designed as a drilled or punched hole. Alternatively, this can be a single, punched rectangle, which can prevent the corrugated foil 3 from twisting in the same way by means of engagement with a tool. In addition, the fourth variant of the cover foil 2 now has two further receptacles 14, which are each arranged between the orientation means 19 and the directly adjacent notches 7.

[0074] Fig. 22 The first assembly step of the fourth variant for producing the arcuate segment 6 of the fourth embodiment of the radial foil bearing 1 according to the invention is shown. Fig.21 The cover foil 2a and the Fig. 20 The corrugated foils 3a of the cover foil 2a are aligned with each other by means of a tool represented here in a cylindrical shape, in that the cylindrical tool engages in the orientation device 19. The cover foil 2a is located radially inside the corrugated foil 3a, in other words, the corrugated foil 3a surrounds the cover foil 2 in the circumferential direction 10. The two foils 2a and 3a are initially spaced apart from each other. The webs 11 of the corrugated foil 3a and the further receptacles 14 of the cover foil 2a are also oriented in alignment with each other.

[0075] Fig.23 The second assembly step of the fourth variant for producing the arcuate segment 6 for the fourth embodiment of the radial foil bearing 1 according to the invention is shown. Fig. 22 , the two foils 2a and 3a are now stacked one on top of the other, so that the orientation means 19 has not lost its overlap. In this illustration, the tool for alignment has been removed again. The tab 11 now engages in the further receptacle 14 and penetrates the cover foil 2a. First, the arc segment 6 or 6a is now ready for further production steps.

[0076] Fig.24The third assembly step for producing a fourth variant of the arcuate segment 6 for a fourth embodiment of the radial foil bearing 1 according to the invention is shown. The web 11 is now bent again by approximately 90° and initially projects beyond the axial limits of the foils 2a, 3a. The arcuate functional surface of the cover foil 2a is not affected by the folded-down further web 13, since the contacting area of ​​the further web 13 is set back from the imaginary extension of the functional surface.

[0077] Fig.25 The fourth assembly step for producing a fourth variant of the arc segment 6 for the fourth embodiment of the radial foil bearing 1 according to the invention is shown. The web 11 is now bent so that it engages in the recess 7 formed by the cover foil 2a. The arc segment 6 is now fully prepared for installation in the outer ring 5.

[0078] Fig.26 1 shows a fifth assembly step in which a fourth variant of the arcuate segment 6 is installed in the outer ring 5 for a fourth embodiment of the radial foil bearing 1 according to the invention. Fig. 9 Similarly, the web 11 engages in a receptacle 12 of the outer ring 5 which is present at the end face 16 or 17. The receptacle 12 continues to extend in the region of the outer side 18, but here also retreats into the outer side 18 in a groove-like manner.

[0079] Fig. 27 The sixth installation step is shown, in which the fourth variant of the arc segment 6 is inserted into the outer ring 5 for the fourth embodiment of the radial foil bearing 1 according to the invention. The tabs 11 are now bent into parts of the receptacles 12, which are arranged at the outer side surface 18. The arc segments 6, 6a are inserted into the outer ring 5 so that the bent tabs 11 completely engage in the receptacles 12 of the outer ring 5. The arc segment 6a is thereby secured in the outer ring 5. The corrugated foil 3a is also clamped between the cover foil 2a and the outer ring 5 so that the corrugated foil 3a can no longer be lost. The securing in the sense of the invention is a locking one.

[0080] Fig.28The seventh assembly step is shown, in which all fourth variants of the arc segments 6 are installed in the outer ring 5 in order to complete the fourth embodiment of the radial foil bearing 1 according to the invention. All arc segments 6a, 6b, 6c of the template according to the fourth variant of the arc segments 6 are installed in the outer ring 5 so that a tab 11 is present in each receptacle 12. The three arc segments 6a, 6b, 6c are positioned one after another in the circumferential direction, wherein the end of one arc segment 6 partially overlaps the beginning of the following arc segment 6. The receptacle 12 is set back from the respective end faces 16 and 17 and the outer side surface 18 so that no part of the tab 11 protrudes beyond the end face 16 or 17 or the outer side surface 18 in the axial direction 8. The orientation of the orientation means 19 and the locking of the orientation means by the engagement of the tab 11 into its recess 7 ensure that no part of the foil 2a, 2b, 2c or 3a, 3b, 3c protrudes beyond the end face 16 or 17. The fourth embodiment of the radial foil bearing 1 according to the invention is complete and can be transported and installed into a housing bore.

[0081] Reference numerals list

[0082] 1 Radial foil bearing

[0083] 2 Covering foil

[0084] 2a First cover foil

[0085] 2b Second cover foil

[0086] 2c Third cover foil

[0087] 3 Corrugated foil

[0088] 3a First corrugated foil

[0089] 3b Second corrugated foil

[0090] 3c Third corrugated foil

[0091] 4 -

[0092] 5 Outer Ring

[0093] 6 Arc segments

[0094] 6a First arc segment

[0095] 6b Second arc segment

[0096] 6c The third arc segment

[0097] 7 Gap

[0098] 8 Axial direction

[0099] 9 Radial direction

[0100] 10 Circumferential direction

[0101] 11. Splice

[0102] 12 Accommodation

[0103] 13 Additional splices

[0104] 14 Additional storage space

[0105] 15 Central Axis

[0106] 16 End face

[0107] 17 End face

[0108] 18 Outer surface

[0109] 19 Orientation mechanism

Claims

1. A radial foil bearing (1), comprising at least one cover foil (2) and at least one corrugated foil (3), wherein the cover foil (2) and the corrugated foil (3) are arranged one above the other in a radial direction (9), and the foils (2, 3) form at least one arc segment (6) of the radial foil bearing (1) in a circumferential direction (10), wherein there is a first arc segment (6a), which is composed only of a first cover foil (2a) and a first corrugated foil (3a) which are fixedly connected to each other at a common end, and there is a second arc segment (6b), which consists only of a second cover foil (2b) and a second corrugated foil (3b) which are fixedly connected to each other at a common end, a third arc segment (6c), which consists only of a third cover foil (2c) and a third corrugated foil (3c) which are fixedly connected to each other at a common end, and the three arc segments (6a, 6b, 6c) are positioned one after another in the outer ring (5), so that the outer ring (5) together with the arc segments (6a, 6b, 6c) constitute the radial foil bearing (1), It is characterized in that Each arcuate segment (6a, 6b, 6c) is fastened to the outer ring (5) by means of at least one web (11) of the respective cover foil (2a, 2b, 2c) and / or the respective corrugated foil (3a, 3b, 3c) bent from a flat initial shape, in which the web (11) engages in a receptacle (12) at the end face (16, 17) and / or the outer side surface (18) of the outer ring (5).

2. The radial foil bearing (1) according to claim 1, characterized in that The at least one web (11) protrudes in an axial direction (8) beyond an axial dimension of the cover foil (2a, 2b, 2c) or the corrugated foil (3a, 3b, 3c).

3. A radial foil bearing (1) according to any one of the preceding claims, characterized in that The at least one web (11) is arranged within an axial dimension which delimits the cover foil (2a, 2b, 2c) or the corrugated foil (3a, 3b, 3c) in the axial direction (8).

4. A radial foil bearing (1) according to any one of the preceding claims, characterized in that The at least one web (11) protrudes in an axial direction (8) beyond an axial dimension of the outer ring (5) which is limited by its end faces (16, 17).

5. A radial foil bearing (1) according to any one of the preceding claims, characterized in that The at least one web (11) engages in a radial direction (9) in a corresponding receptacle (12) of the outer ring (5) provided for the at least one web (11).

6. A radial foil bearing (1) according to any one of the preceding claims, characterised in that The receptacle (12) is recessed into the material at the end faces (16, 17) of the outer ring (5).

7. A radial foil bearing (1) according to any one of the preceding claims, characterised in that One of the at least one web (11) engages in a radial direction (9) in a corresponding receptacle (12) of the outer ring (5) provided for the at least one web (11), and the corresponding arcuate section (6a, 6b, 6c) is oriented in an angularly adapted manner within the outer ring (5).

8. A radial foil bearing (1) according to any one of the preceding claims, characterised in that The receiving portion (12) is recessed into the material at the outer side surface (18) of the outer ring (5).

9. A radial foil bearing (1) according to any one of the preceding claims, characterised in that The web (11) engages in a receptacle (12) which is recessed into the material on the outer side surface (18) of the outer ring (5).

10. An arcuate section (6a, 6b, 6c) of a radial foil bearing (1) according to any one of the preceding claims, characterized in that: The web (11) is capable of fixedly connecting the arcuate segment (6a, 6b, 6c) to the outer ring (5), and a further web (13) is formed by the cover foil (2a, 2b, 2c) and / or the corrugated foil (3a, 3b, 3c), which fixedly connects two corresponding foils (2a, 2b, 2c, 3a, 3b, 3c) to each other to form an arcuate segment (6a, 6b, 6c).

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