Bearing arrangement, magnetic rotor assembly and fuel cell system

Abstract

The invention relates to a bearing arrangement (1) comprising a bearing journal (3) for rotationally fixed arrangement on a first housing part (8), a rotating body (4), in particular a hub (4) with a compressor wheel (23) for rotation about an axis of rotation (R) and a bearing unit (10) consisting of a first bearing (17) and a second bearing (19) for the rotational support of a rotating body (4) about the bearing journal (3), which is rotationally symmetric about the axis of rotation (R), with at least one respective inner bearing ring (11a, b) for mounting on the bearing journal (3) and at least one respective outer bearing ring (12a, b) which is rotationally fixed to the rotating body (4).In this arrangement, a bearing chamber (31a, b) is formed between the respective inner bearing ring (11a, b) and the respective outer bearing ring (12a, b), each chamber comprising several rolling elements (13) for rolling on a respective rolling element track (14) along an inner surface of the respective outer bearing ring (12a, b). According to the invention, the bearing journal (3) has at least one bore (18, 21), wherein a bearing chamber (22) located in the direction of the axis of rotation (R) between the bearings (17, 19) can be supplied with a lubricant (15) via the at least one bore (18, 21). The invention further relates to a magnetic rotor device (2) and a fuel cell system (5) with a bearing arrangement (1) according to the invention.

Description

State of the art

[0001] Rotating components with rolling bearings are found in various technical devices, particularly in drive systems. One example of such a drive system is a mobile fuel cell using hydrogen as the energy carrier. By design, a fuel cell system has an anode path, also known as the hydrogen path. To achieve low hydrogen consumption in the fuel cell, a side-channel compressor can be used to recirculate the unused hydrogen. This process converts kinetic energy into pressure. The energy transfer occurs multiple times along the entire length of the side channel, enabling a high energy transfer rate. This results in a pressure increase at the outlet compared to the inlet.

[0002] However, especially in side-channel blowers, the high energy transfer leads to high bearing loads and high rotational speeds in the rolling bearings. Due to the centrifugal forces that occur, a lubricant in such a rolling bearing can be subjected to accelerations of up to 7000G.

[0003] From DE 10 2021 201 442 A1 and DE 10 2022 212 235 A1, bearing arrangements are known that have certain disadvantages. The bearing arrangement known from the prior art uses grease lubrication. Furthermore, a bearing arrangement known from the prior art can have disadvantages if non-standard ball bearings are used. Since the respective bearings are permanently installed in the bearing arrangement and side channel blower, introducing new bearing grease after the assembly of the bearing arrangement and the side channel blower is very difficult and requires at least partial disassembly of the bearing arrangement and / or the side channel blower.

[0004] Furthermore, the bearing grease must be kept on hand and readily available during the assembly of the bearing assembly and / or the side channel blower. This poses significant challenges for assembly, as handling loose grease can lead to contamination on the assembly line and the introduction of dirt into the bearing assembly and / or the side channel blower. A key advantage offered by non-standardized ball bearings is the precise placement of the grease. The degree of freedom to precisely place the grease within the bearing system is severely limited by certain processes on the assembly line. This also increases assembly costs. Another problem, which also affects standardized ball bearings, is the external sealing of the bearings. Over extended periods of operation, grease escapes from the bearing interior via a cover plate and / or sealing washer, ultimately leading to premature failure of the bearing. Disclosure of the invention

[0005] The invention relates to a bearing arrangement, a magnetic rotor device and a fuel cell system.

[0006] According to a first aspect of the invention, a bearing arrangement is provided. The bearing arrangement comprises a bearing journal for rotationally fixed mounting on a housing element and a rotating body, in particular a hub with a compressor wheel, for rotation about an axis of rotation R. Furthermore, the bearing arrangement includes a bearing unit for the rotational support of the rotating body about the bearing journal. The bearing journal is rotationally symmetrical about the axis of rotation R. The bearing unit comprises at least one inner bearing ring for mounting on the bearing journal and at least one outer bearing ring, which is rotationally fixed to the rotating body. A bearing chamber is formed between the inner bearing ring and the outer bearing ring. The bearing chamber contains several rolling elements for rolling on a rolling element track along an inner surface of the outer bearing ring and a lubricant for rolling the rolling elements on the rolling element track.According to the invention, the bearing journal has at least one bore, wherein a bearing chamber located between the bearings in the direction of the axis of rotation R can be supplied with lubricant via the at least one bore. In this way, the advantage can be achieved that the disadvantages known from the prior art are at least partially eliminated. Due to the inventive design of the bearing arrangement, the advantage can be achieved that the bearing grease can only be introduced into the bearing chamber, and thus into the bearing arrangement and / or a side-channel compressor, after the assembly process has been completed, so that the bearing arrangement and / or the bearings can only be lubricated in the fully assembled state. This also prevents contamination by grease carryover on the assembly line when handling free bearing grease.Furthermore, contamination of the bearing grease during assembly can be prevented, thereby reducing the probability of failure of the bearing assembly and / or the side channel blower. Another advantage of the invention is the ability to replenish the bearing assembly with fresh grease after a certain operating time without having to disassemble the bearing assembly and / or the side channel blower or remove it from the fuel cell system. Moreover, the arrangement of the lubricant according to the invention in the bearing space between the bearings offers the advantage that the lubricant can be efficiently protected against external contamination. This can, in particular, extend the service life of the lubricant and thus of the bearing unit and therefore of the entire side channel blower.

[0007] The measures listed in the dependent claims enable advantageous further developments of the bearing arrangement specified in claim 1. The dependent claims relate to preferred further developments of the invention.

[0008] A first housing part can be part of the bearing assembly. Furthermore, the first housing part can at least partially surround the bearing journal and / or the rotating body. In particular, the first housing part can be designed to fasten the bearing assembly within the side-channel compressor. The bearing journal is, in particular, a stationary bearing journal. For example, the bearing journal can comprise a cylindrical body that extends from the first housing part into an interior housing space. The bearing journal can be made of the same material and / or be integral with the first housing part. Preferably, the first housing part can be part of a pump housing.

[0009] The rotating body can, for example, include a hub for receiving an impeller of the side-channel compressor and / or the impeller itself. Furthermore, the rotating body can include drive elements, e.g., in the form of magnetic and / or magnetizable elements, to be driven by a drive motor to rotate around the bearing journal.

[0010] The bearing unit allows the rotating body to be spaced apart from the bearing journal. The bearing unit can, in particular, comprise at least two rolling bearings. The respective inner and outer bearing rings are separated by the bearing interior, which may be laterally open or sealed. The rolling elements of the respective bearing unit can be connected to each other and / or spaced apart from each other by a bearing cage. Preferably, the rolling elements comprise balls or rollers. In particular, the bearing unit can be formed by at least one, preferably two, deep groove ball bearings.

[0011] For a rotationally fixed connection of the respective bearing outer ring to the rotating body, the bearing outer ring can be connected to the rotating body by force-fit, form-fit, and / or material-fit. Preferably, the bearing outer ring is pressed into a recess in the rotating body. The bearing inner ring can be mounted on the bearing journal. The bearing inner ring can be rigidly connected to the bearing journal or floating. Preferably, the bearing inner ring is spring-loaded in an axial direction along the bearing journal.

[0012] The lubricant can, for example, comprise a solid and / or liquid lubricant, preferably a grease. The inner surface of the bearing outer ring can include an inner surface. The rolling element track can have a recess, particularly in the form of a circumferential groove, in the bearing outer ring. The bearing inner ring can have its own rolling element track.

[0013] It has been recognized that, in particular, high rotational speeds in the bearing arrangement can lead to a radially outward force acting on the lubricant. The lubricant located within the bearing chamber can therefore provide a collection and / or containment mechanism for the lubricant, preventing a large quantity from accumulating in the area of ​​the rolling elements and being frequently rolled over during operation of the bearing arrangement. Simultaneously, the bearing chamber can serve as a reservoir for the lubricant, from which the lubricant can be dispensed to lubricate the moving components of the bearing unit.

[0014] According to an advantageous embodiment of the bearing arrangement, the lubricant, which is in particular bearing grease, comprises a base material for lubricating the rolling element track and a carrier material for the base material. This achieves the advantage of efficient lubrication of the respective bearing and the respective rolling element track by allowing the base material to be selectively introduced into the bearing, while the carrier material remains in the bearing space. The carrier material can be sponge-like and / or have a sponge-like structure to receive the base material. The base material can comprise a base oil, in particular a synthetic one. For example, the lubricant can comprise a synthetic grease based on polyalphaolefin (PAO) or another synthetic base oil. PAO base oils can exhibit high thermal stability, high oxidation resistance, and / or advantageous viscosity-temperature behavior.In particular, the carrier material can comprise a thickener and / or a PTFE-based material. When the lubricant collects in the bearing chamber, the radially outward force can cause the base oil to be at least partially separated from the carrier material and directed towards the rolling element track. This allows the carrier material to remain in the bearing chamber and be protected from being rolled over by the rolling elements. Simultaneously, the base oil can lubricate the rolling element track and the rolling elements themselves. Preferably, the bearing chamber can be designed to hold more than 30 percent, more than 50 percent, or more than 90 percent of the lubricant. This increases the service life of the respective bearing and / or bearing assembly.

[0015] According to a particularly advantageous embodiment of the bearing arrangement, the bearing space can be supplied with lubricant by means of at least one first transverse bore, which runs at least nearly orthogonally to the axis of rotation R or at an angle α to the axis of rotation R, and a grease supply bore running at least nearly parallel or coaxially to the axis of rotation R, wherein, in particular, the lubricant can be introduced via a grease nipple using a grease gun. In this way, the advantage can be achieved that the lubricant can be efficiently introduced into the bearing space from outside the bearing arrangement and / or the side channel blower. This can also be done repeatedly at defined intervals, so that the respective bearing can be supplied with lubricant and / or bearing grease and / or the base material throughout the entire service life of the side channel blower.This increases the bearing lifespan, which in turn extends the service life of the entire side channel blower. Furthermore, the inventive design of the bearing arrangement allows for a compact design of both the bearing assembly and the side channel blower.

[0016] According to an advantageous embodiment of the bearing arrangement, the lubricant, particularly after flowing through the respective bore, adheres to and / or is located on an outer diameter region of the bearing journal. This achieves the advantage of ensuring a continuous and consistent delivery of the lubricant, in the form of the base material, to the rolling element track of the respective bearing, while simultaneously ensuring that the lubricant carrier material reliably remains within the outer diameter region. The base material then flows in a secondary direction into the respective first or second bearing, wetting the respective rolling element track there.Furthermore, adhesion of the lubricant and / or bearing grease to the non-rotating bearing journal can be advantageous, particularly in the outer diameter area, as the lubricant carrier material is not subjected to centrifugal forces or flexing during operation, thus increasing the lubricant's service life. The moving components are lubricated solely by the base material, especially the base oil, which evaporates from the lubricant carrier material when heated. This extends the bearing service life, thereby increasing the overall service life of the side-channel compressor.

[0017] According to an advantageous embodiment of the bearing arrangement, the bearing arrangement comprises at least one spacer disk that extends in a ring-shaped circumferential fashion around the axis of rotation R and is arranged between the first and second bearings in the direction of the axis of rotation R, and is in contact with them in the direction of the axis of rotation R. This has the advantage that pivoting of the bearing arrangement relative to the axis of rotation R is better prevented in a simple and cost-effective manner. Wear of the bearing arrangement is thus reduced and its service life is increased. Furthermore, the smooth running of the side channel blower is improved in this way.

[0018] According to a particularly advantageous embodiment of the bearing arrangement, the spacer disc has a tipped shape, wherein the lubricant, especially after passing through the respective bore, adheres to and / or is located at the tip. This provides the advantage that the lubricant can be applied to the tip of the shape, and during operation of the side-channel compressor, a uniform bead of lubricant, particularly a bearing grease bead, is formed radially around the axis of rotation R due to rotation of the hub and / or the compressor wheel and / or the shape. Thus, the base material of the bearing grease and / or lubricant is distributed evenly to the bearings during operation of the side-channel compressor, particularly in a secondary flow direction. This increases the bearing service life, which in turn extends the service life of the entire side-channel compressor.

[0019] In a particularly preferred embodiment of the bearing arrangement, the bearing journal has only a single transverse bore, thus ensuring a uniform, ring-shaped distribution of the lubricant around the axis of rotation R on the spacer disk. This allows for improved and uniform distribution of the lubricant in the bearing chamber, especially at the tip of the spacer disk's shape, since a uniform release of lubricant from the single transverse bore to the ring-shaped tip around the axis of rotation R can be achieved. This ensures consistently reliable lubrication of the bearings during operation, thereby reducing the probability of bearing failure. Furthermore, the manufacturing costs of the side-channel compressor can be reduced, as fewer machining steps are required to create the single bore.

[0020] According to a particularly advantageous embodiment of the bearing arrangement, the spacer disc has at least one second transverse bore in the area of ​​its shape, running at least nearly parallel to the axis of rotation R. This provides the advantage that, in the event of insufficient lubrication of one of the two bearings, the lubricant from the other bearing can be used to lubricate the under-lubricated bearing. The lubricant can flow from one bearing to the other via the second transverse bore, in particular at least nearly parallel to the axis of rotation R, in a second flow direction. Thus, losses, for example, due to the seal between a sealing washer and the inner bearing ring, can be compensated for by the lubricant from the twin bearing.Even if the base material, especially the base oil, is unevenly distributed due to a prolonged deviation in the fuel cell system's position (for example, because the vehicle was parked on a slope), the base oil can redistribute itself equally between both bearings. This increases the bearing lifespan, thereby extending the overall service life of the side-channel compressor.

[0021] According to a further aspect of the invention, a magnetic rotor assembly is provided. The magnetic rotor assembly can comprise the components bearing arrangement, rotating body and compressor wheel.

[0022] According to a further aspect of the invention, a fuel cell system is provided. The fuel cell system has a conveying path for conveying a fluid and a side channel compressor for conveying the fluid in the conveying path. The side channel compressor comprises the bearing arrangement and / or the magnetic rotor device according to the invention.

[0023] This at least partially eliminates the disadvantages known from the prior art. The side channel blower can have the first housing part to which the bearing journal of the bearing assembly is rotationally fixed.

[0024] Thus, a magnetic rotor device and / or a fuel cell system according to the invention offers the same advantages as those already described in detail with reference to the bearing arrangement according to the invention. The fluid can preferably comprise hydrogen or consist of hydrogen. The side channel compressor can, for example, comprise a centrifugal impeller compressor. The fluid can be supplied to a working chamber with the impeller, which can be driven by a motor. This allows the fluid to circulate in the housing, in the blades, and in the side channels to form a circulation flow. Energy is transferred from the circulation flow to the delivery flow in the side channel by momentum exchange.

[0025] Further advantages, features, and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. Brief description of the drawing

[0026] They show schematically: Fig. 1 in a sectional view a side channel blower with a bearing arrangement according to the state of the art, Fig. 2 the bearing arrangement of a magnetic rotor device according to a first embodiment, Fig. 3 one in Fig. 2 Sectional view of a bearing journal of the bearing arrangement, labelled AA, with a lubricant in enlarged view, Fig. 4 the bearing arrangement of the magnetic rotor device according to a second embodiment, Fig. 5 one in Fig. 4 Sectional view of the bearing journal of the bearing arrangement with lubricant according to a second embodiment in enlarged view, designated BB, Fig. 6 the bearing arrangement according to a third embodiment with a second flow direction of a base material of the lubricant.

[0027] In the following description of some embodiments of the invention, the same reference numerals are used for the same technical features even in different embodiments.

[0028] In Fig. Figure 1 shows a side-channel blower 7 according to the prior art, schematically depicted in a sectional view. The side-channel blower 7 has a housing with a first housing part 8 and a second housing part 9. The first housing part 8 has a bearing journal 3 extending towards the second housing part 9 and a bearing assembly 1, in particular a bearing unit 10, with two rolling bearings 17, 19, arranged on the bearing journal 3. The first bearing 17 and the second bearing 19 of the bearing assembly 1 are arranged concentrically next to each other along an axis of rotation R. In addition, a spacer 25 is located between the rolling bearings 17, 19, wherein in particular a respective outer bearing ring 12a, b is in axial contact with the spacer 25 relative to the axis of rotation R. Inner bearing rings 11a, b of the bearing assembly 1 are also arranged on the bearing journal 3.A rotating body 4 with a compressor wheel 23 is arranged on the outer bearing rings 12a, b of the bearing arrangement 1. The side channel compressor 7 also has a magnetic rotor assembly 2, which in turn comprises the components compressor wheel 23, rotating body 4, and bearing arrangement 1. A bearing chamber 31a, b is formed between the inner bearing rings 11 and the outer bearing rings 12, containing several rolling elements 13 for rolling on a rolling element track 14 along an inner surface of the outer bearing ring 12.

[0029] As in Fig. As shown in Figure 1, the side-channel compressor 7 has a spring element 29 by means of which the bearing arrangement 1 can be subjected to a bearing preload. At least one sealing washer 27 is located between the respective inner bearing ring 11a, b and the respective outer bearing ring 12a, b to encapsulate a bearing interior 31a, b, thereby preventing, in particular, the escape of lubricant from the bearing interior 31a, b, and also preventing contamination of the bearing interior 31a, b by particles or liquids from outside the respective bearing 17, 19, especially from the environment. Within the respective bearing 17, 19, at least one rolling element track 14 can be formed in the respective inner bearing ring 11a, b and / or the respective outer bearing ring 12a, b, whereby the material is subjected to an additional hardening process to increase its service life.Furthermore, the side channel compressor 7 can be connected to a conveying path 6 of a fuel cell system 5. A gaseous medium, in particular hydrogen, which has been accelerated and / or compressed in the side channel compressor 7, is conveyed to a fuel cell of the fuel cell system 5 via the conveying path 6.

[0030] Fig. Figure 2 shows the bearing arrangement 1 of the magnetic rotor device 2 according to a first embodiment. It is shown that the bearing arrangement 1 provides the bearing journal 3 for rotationally fixed mounting on the first housing part 8, the rotating body 4 for rotation about the axis of rotation R, and the bearing unit 10, consisting of a first bearing 17 and a second bearing 19, for the rotational support of the rotating body 4 about the bearing journal 3, which is rotationally symmetrical about the axis of rotation R. At least one inner bearing ring 11a, b can be attached to the bearing journal 3. Furthermore, at least one outer bearing ring 12a, b is rotationally fixed to the rotating body 4.Furthermore, a bearing interior 31a, b is formed between the respective inner bearing ring 11a, b and the respective outer bearing ring 12a, b, which contains several rolling elements 13 for rolling on a respective rolling element track 14 along an inner side of the respective outer bearing ring 12a, b and a lubricant 15 for rolling the respective rolling elements 13 on the respective rolling element track 14.

[0031] Fig. Figure 2 further shows that at least one sealing disc 27 is positioned between the respective inner bearing ring 8a, b and the respective outer bearing ring 11a, b to encapsulate the bearing interior 31, thereby preventing, in particular, the escape of lubricant from the bearing interior 31 and also preventing contamination of the bearing interior 31 by particles from outside the respective bearing 17, 19, especially from the surrounding environment. The respective sealing disc 27 is connected to the respective outer bearing ring 11a, b by a force-fit, positive-fit, and / or friction-fit connection, and the respective sealing disc 27 rotates with the respective outer bearing ring 11a, b during operation of the side channel compressor 7. The bearing unit 10, in particular the first bearing 17, is fixed on the bearing journal 3 in the direction of the axis of rotation R by means of a fastening element and a first stop washer 36, in particular against slipping.The first stop washer 36 acts in particular on the inner bearing ring 11a of the first bearing 17 and is in contact with it. Furthermore, the bearing unit 10, in particular the second bearing 19, is fixed on the bearing journal 3 by means of a second stop washer 38 in the direction of the axis of rotation R, in particular to prevent slippage. The second stop washer 38 acts in particular on the inner bearing ring 11b of the second bearing 19 and is in contact with it. The spring element 29 acts on the second stop washer 38, in particular at least nearly in the direction of the axis of rotation R, such that the bearing unit 10 and / or the bearing arrangement 1 can be subjected to a preload force, in particular a bearing preload force. This bearing preload force is transmitted from the second bearing 19 to the first bearing 17 via the spacer washer 25, since the outer bearing rings 12a, b are in contact with the spacer washer 25 in the direction of the axis of rotation R.The spacer disk 25 runs in a ring-shaped circumferential fashion around the axis of rotation R and is arranged in the direction of the axis of rotation R between the first bearing 17 and the second bearing 19 and is in contact with these in the direction of the axis of rotation R.

[0032] Furthermore, in Fig. Figure 2 shows that the bearing journal 3 has at least one bore 18, 21, wherein a bearing space 22 located in the direction of the axis of rotation R between the bearings 17, 19 can be supplied with the lubricant 15 via the at least one bore 18, 21. In an exemplary embodiment, the bearing journal 3 has a grease supply bore 18 and at least one first transverse bore 21, wherein the grease supply bore 18 has at least one grease nipple 40 in its end region, by means of which the lubricant 15 can be introduced into the grease supply bore 18. The lubricant 15 flows in a first flow direction 30 through the grease supply bore 18 and then through the respective first transverse bore 21 into the bearing chamber 22, whereby the lubricant 15 adheres to an outer diameter region 16 of the bearing journal 3 in the bearing chamber 22 in this exemplary embodiment of the bearing arrangement 1.The lubricant 15, which is in particular the bearing grease 15, can comprise a base material 15.1 for lubricating the rolling element track 14 and a carrier material 15.2 for the base material 15.1. In particular, a carrier material 15.2 adheres to the outer diameter region 16 of the bearing journal 3, so that both bearings 17, 19 can be supplied with the base material 15.1 from there in a second flow direction 45.

[0033] As further in Fig. As shown in Figure 2, the bearing space 22 can be supplied with lubricant 15 by means of at least one first transverse bore 21, which runs at least nearly orthogonally to the axis of rotation R or at an angle α to the axis of rotation R, and the grease supply bore 18, which runs at least nearly parallel or coaxially to the axis of rotation R. The lubricant 15 can be introduced via the grease nipple 40, for example using a grease gun, wherein the lubricant 15, particularly after flowing through the respective bore 18, 21, adheres to and / or is located on the outer diameter region 16 of the bearing journal 3.As shown, the bearing unit 10, in particular the first bearing 17, the second bearing 19 and / or the spacer 25, is pressed into the rotating body 4, in particular the hub 4, wherein the compressor wheel 23 can be located on the rotating body 4, in particular among other things on at least one outer diameter of the rotating body 4 and / or is connected to it by force-fit and / or form-fit and / or friction-fit.

[0034] Fig. 3 shows one in Fig. Figure 2, labeled AA, shows an enlarged sectional view of the bearing journal 3 of the bearing arrangement 1 with the lubricant 15. It is shown that in this exemplary embodiment of the bearing arrangement 1, the bearing journal 3 has a total of four first transverse bores 21a, b, c, d extending from the grease supply bore 18. In other exemplary embodiments, the bearing journal 3 can also have one, two, three, five, or more transverse bores 21, wherein the lubricant 15 can flow through the transverse bores in a first flow direction 30. Furthermore, it is shown that in this exemplary embodiment, four reservoirs of lubricant 15 are formed on the outer diameter of the bearing journal 3, by means of which the bearings 17, 19 can be supplied with the base material 15.1 emerging from the carrier material 15.2.

[0035] Fig. Figure 4 shows the bearing arrangement 1 of the magnetic rotor assembly 2 according to a second embodiment. It is shown that the spacer disk 25 has a shape 41 with a tip 42, wherein the lubricant 15 adheres to and / or is located at the tip 42, particularly after passing through the respective bore 18, 21. In this exemplary second embodiment of the bearing arrangement 1, the bearing journal 3 has only one first transverse bore 21b by means of which the bearing chamber 22 can be supplied from the grease supply bore 18. The carrier material 15.2 of the lubricant 15 remains at the annular tip 42 of the spacer disk 25, which extends around the axis of rotation R, whereby the bearings 17, 19 can be supplied with the base material 15.1 emerging from the carrier material 15.2 and the base material 15.1 flows into the respective bearing 17, 19 in a second flow direction 45.For example, the centrifugal force resulting from the rotating spacer 25 and the bearing space 22 of the lubricant 15 can be used.

[0036] Fig. 5 shows one in Fig. Figure 4, labeled BB, shows a sectional view of the bearing journal 3 of the bearing arrangement 1 with the lubricant 15 according to a second embodiment in an enlarged view. It is shown that the bearing journal 3 has only one transverse bore 21b, thus ensuring a uniform, ring-shaped distribution of the lubricant 15 around the axis of rotation R on the spacer 25. The grease supply bore 18, from which the transverse bore 21b can be supplied with lubricant 15, is also shown. Fig. Figure 5 further illustrates that the lubricant 15 is applied to the spacer disk 25, which rotates with the side-channel compressor 7 during operation, particularly to its tip 42. The spacer disk 25 is designed such that it fits radially close to the bearing journal 3 relative to the axis of rotation R, ensuring that the lubricant 15, in particular the carrier material 15.2, is applied to the pointed circumferential shape 41 of the spacer disk 25. Rotating the magnetic rotor assembly 2 during the supply of the lubricant 15 via the grease nipple 40 results in a uniform bead of lubricant 15 rotating radially around the axis of rotation R. It is shown that the rotating body 4, together with the spacer disk 25 and the compressor wheel 23, rotates in a direction 43.

[0037] Fig.Figure 6 shows the bearing arrangement 1 according to a third embodiment with a second flow direction 45b of the base material 15.1 of the lubricant 15. It is shown that the spacer disk 25 has at least one second transverse bore 44 in the area of ​​its shape 41, extending at least nearly parallel to the axis of rotation R. Advantageously, this allows for the exchange of the base material 15.1 in a respective second flow direction 45b between the first bearing 17 and the second bearing 19. Thus, if a bearing 17, 19 is insufficiently supplied with the base material 15.1 of the lubricant 15, it can reach the other bearing 17, 19 via the second transverse bore 44. A plurality of second transverse bores 44 can be located in the spacer disk 25, arranged circumferentially around the axis of rotation R in the shape 41. QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] DE 10 2021 201 442 A1

[0003] DE 10 2022 212 235 A1

[0003]

Claims

[1] storage arrangement (1) comprising a bearing pin (3) for rotationally fixed arrangement on a first housing part (8), a rotating body (4), in particular a hub (4) with a compressor wheel (23), for rotation about an axis of rotation (R) and a bearing unit (10), consisting of a first bearing (17) and a second bearing (19), for the rotational support of the rotating body (4) about the bearing journal (3), which is rotationally symmetric about the axis of rotation (R), with at least one respective inner bearing ring (11a, b) for mounting on the bearing journal (3) and at least one respective outer bearing ring (12a, b), which is rotationally fixed to the rotating body (4), wherein a bearing interior (31a, b) is formed between the respective bearing inner ring (11a, b) and the respective bearing outer ring (12a, b), which each comprises several rolling elements (13) for rolling on a respective rolling element track (14) along an inner side of the respective bearing outer ring (12a, b), characterized by , that the bearing journal (3) has at least one bore (18, 21), wherein a bearing space (22) located in the direction of the axis of rotation (R) between the bearings (17, 19) can be supplied with a lubricant (15) via the at least one bore (18, 21). [2] Storage arrangement (1) according to claim 1, characterized by , that the lubricant (15), which is in particular bearing grease (15), comprises a base material (15.1) for lubricating the rolling element track (14) and a carrier material (15.2) for the base material (15.1). [3] Storage arrangement (1) according to claim 1 or 2, characterized by, that the bearing space (22) can be supplied with lubricant (15) by means of at least one first transverse bore (21) which is at least nearly orthogonal to the axis of rotation (R) or at an angle α to the axis of rotation (R), and a grease supply bore (18) which is at least nearly parallel or coaxial to the axis of rotation (R), wherein in particular the lubricant (15) can be introduced by means of a grease nipple (40) via a grease gun. [4] Storage arrangement (1) according to any of the preceding claims, characterized by , that the lubricant (15), in particular after flowing through the respective bore (18, 21), adheres to and / or is arranged on an outer diameter area (16) of the bearing journal (3). [5] Storage arrangement (1) according to any one of the preceding claims, characterized by, that the bearing arrangement (1) has at least one spacer disk (25) which runs in a ring-shaped circumferential direction around the axis of rotation R and is arranged in the direction of the axis of rotation R between the first bearing (17) and the second bearing (19) and is in contact with them in the direction of the axis of rotation R. [6] Storage arrangement (1) according to claim 5, characterized by , that the spacer (25) has a shape (41) with a tip (42), wherein the lubricant (15), in particular after passing through the respective bore (18, 21), adheres to the tip (42) and / or is arranged there. [7] Storage arrangement (1) according to claim 5 or 6, characterized by , that the bearing journal (3) has only one transverse bore (21b), thus bringing about a uniform annular distribution of the lubricant (15) around the axis of rotation (R) on the spacer (25). [8] Storage arrangement (1) according to any one of claims 5 to 7, characterized by, that the spacer (25) has at least one second transverse bore (44) running at least nearly parallel to the axis of rotation (R) in the area of ​​its shaping (41). [9] Magnetic rotor device (2) for a side channel compressor (7) for a fuel cell system (31) for conveying and / or compressing a gaseous medium, in particular hydrogen, according to one of the preceding claims, wherein the magnetic rotor device (2) comprises the bearing arrangement (1). [10] Fuel cell system (5) comprising a conveying path (6) for conveying a fluid, and a side channel compressor (7) for conveying the fluid in the conveying path (6) with the bearing arrangement (1) according to one of the preceding claims.

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