DE102020215701A1 - Bearing arrangement in a turbomachine - Google Patents

Abstract

The present invention relates to a bearing arrangement (10) for a shaft (30) in a turbomachine (100) with a bearing housing section (12) for accommodating a shaft bearing (20). A fixing pin (60) is provided for fixing the outer bearing ring (21) to the bearing housing section (12). A cavity (11) is formed in the bearing housing section (12) which is open to an outside thereof and which, in a fixing position of the bearing arrangement (10), passes through an outer fixing pin receptacle (16) of the bearing housing section (12) to an inner fixing pin receptacle (26) of a bearing outer ring (21) leads.

Description

The present invention relates to the structure of a bearing arrangement in a turbomachine for supporting a shaft for an impeller of the turbomachine, and in particular to fixing the shaft bearing in relation to a bearing housing section of a turbomachine.

Possible turbomachines within the scope of the invention include working machines such as centrifugal pumps, fans or compressors in which fluid flows are conveyed by blades of an impeller, prime movers such as turbines in which an impeller with blades is driven by a fluid flow, and combined machines such as an exhaust gas turbocharger, in in which a first impeller is driven by a first fluid stream while a second fluid stream is conveyed through a second impeller. In comparison to rotary displacement machines, turbomachines, in particular turbo compressors, are operated at higher speeds, so that, depending on the type, there may be greater requirements for lubrication or cooling of a shaft bearing.

As a rule, a bore is provided in a bearing housing, in which a shaft bearing is inserted or pressed. Furthermore, in applications in which a compact installation space is sought, so-called compact bearings are increasingly used, which for example comprise two axially spaced bearing points for absorbing tilting moments of the shaft, and thus as a unit for supporting the shaft in a central part of the shaft between an impeller side and a drive side can be used.

• Es muss eine fertig vormontierte Lagerkartusche, d.h. einschließlich des Fertigungsaufwands einer Zentrierung und Fixierung von Lagerteilen im Rahmen der Vormontage bereitgestellt werden. Darauf folgt erneut ein Montageaufwand zur Zentrierung und Fixierung der vormontierten Lagerkartusche innerhalb des Lagergehäuseabschnittes der Strömungsmaschine.

A structure of a corresponding bearing arrangement is known in the prior art, in which a radially directed fixing screw is used in order to center the shaft bearing in a fixing position and to secure it against axial displacement in the bearing housing or against twisting in the direction of rotation. With this design, the fixing screw is inserted inside the bearing and screwed into a thread in the surrounding bearing housing. However, with the structure mentioned, problems arise during assembly and constructive disadvantages:

• A fully pre-assembled bearing cartridge must be provided, ie including the production costs of centering and fixing bearing parts as part of the pre-assembly. This is followed again by assembly work for centering and fixing the preassembled bearing cartridge within the bearing housing section of the turbomachine.

Furthermore, a thread must be provided on the bearing housing, usually for fixing the pre-assembled bearing cartridge or for fixing at least one other fixing means such as a fixing screw. Such a thread requires, in particular, radial installation space in a critical housing environment, which is preferably used in some types of turbomachines, such as in particular turbo compressors with high operating speeds, for internal routing of oil ducts or cooling ducts. Accordingly, a bearing housing section of a conventional turbomachine often has a correspondingly large installation space, or alternatively a correspondingly complex design that is difficult to manufacture for receiving and integrating one or more threads and channels around the bearing seat.

It is an object of the present invention to at least partially eliminate the disadvantages described above. In particular, it is the object of the present invention to provide a corresponding bearing arrangement in a turbomachine with a structure that enables easy assembly and efficient use of the installation space within the housing.

The above object is achieved by a bearing arrangement for a shaft having the features of claim 1 and a turbomachine having the features of claim 13. Further features and details of the invention result from the dependent claims, the description and the drawing. Features and details that are described in connection with the bearing arrangement according to the invention naturally also apply in connection with the overall structure according to the invention of a corresponding turbomachine, in particular with regard to an exhaust gas turbocharger constructed in this way for an internal combustion engine and vice versa, so that with regard to the disclosure the individual aspects of the invention are always mutually referred to or can be referred to.

According to the invention, a bearing arrangement for a shaft in a turbomachine is provided. On the turbomachine side, the bearing arrangement comprises a bearing housing section for accommodating a shaft bearing between an impeller and a drive device or a drive side of the turbomachine. The bearing assembly further includes a shaft bearing for mounting the shaft on the bearing housing portion, with a rotatable bearing inner race for receiving the shaft and with a static bearing outer race received in the bearing housing portion. The bearing assembly also includes a locating pin for axially locating and/or rotationally locating the bearing outer race on the bearing housing cut. In a fixing position of the bearing arrangement, the locating pin is fastened in an inner locating pin receptacle of the bearing outer ring and extends into an outer locating pin receptacle of the bearing housing section. Part of the bearing arrangement is also a cavity in the bearing housing section which is open to an outside thereof and which, in the fixing position of the bearing arrangement, leads through the outer locating pin receptacle of the bearing housing section to the inner locating pin receptacle of the bearing outer ring.

With regard to fixing the shaft bearing in the bearing housing section, the bearing arrangement according to the invention is based on the structure explained above using a fixing screw between a bearing part and a thread on the housing. According to the invention, however, the known construction is now improved in the vicinity of the fixing screw and with the aid of possible variants of the fixing screw itself.

One advantage of the bearing arrangement according to the invention is that it is easier to assemble, in particular to fix the shaft bearing in the bearing housing of the turbomachine.

In the structure of the present invention, the fixing pin for securing the shaft bearing is inserted from an outside of the bearing housing toward the shaft bearing, so that a mechanical connection is established between the bearing housing and the outer ring of the shaft bearing.

Advantages of the bearing arrangement according to the invention over known conventional structures result from reversing a threaded section and a screw head of a fixing screw or reversing corresponding opposite sections of a fixing pin and/or eliminating the need to manufacture and fix a thread for a bearing cartridge in the bearing housing section.

In the case of a screw, the threaded section is usually longer than a screw head. In a conventional structure, the threaded section of the screw takes up a correspondingly large amount of space in a periphery of a receiving bore in the bearing housing for the shaft bearing. In the periphery of the receiving bore, however, a duct for oil ducts or coolant ducts can be provided in the vicinity of the shaft bearing, particularly in the case of types of turbomachines with high operating speeds. In the construction according to the invention, on the other hand, a rear housing section of the fixing pin in the direction of insertion, such as a screw head of a fixing screw, i.e. a shorter section than a threaded section, extends into the periphery of the receiving bore in the bearing housing and here takes up a correspondingly smaller installation space in the according to the invention -ßen bearing arrangement.

Consequently, the bearing arrangement according to the invention creates more installation space in the periphery of the receiving bore for the shaft bearing and greater design freedom for arranging internal channels within a critical installation space of the turbomachine. Furthermore, alternative options for designing contact surfaces in the axial and radial directions in the bearing housing are created.

It can be advantageous if the bearing housing section comprises at least one lubricant supply channel for supplying a lubricant to the shaft bearing, with the lubricant supply channel and the cavity overlapping. This configuration achieves an integration of functional cavities in the bearing housing. In turn, space in the periphery of the receiving bore of the bearing housing for the shaft bearing is saved by joint use of an overlapping construction space of the lubricant supply channel and the cavity. This creates further design freedom for the arrangement of internal channels in this structurally critical area.

It can be particularly advantageous if the bearing housing section includes a lubricant supply channel for supplying a lubricant to the shaft bearing, with the cavity also being set up as a section of the lubricant supply channel directed radially inwards with respect to the shaft. On the one hand, this configuration increases the integration of common cavities between the cavity and the lubricant supply channel, as a result of which further installation space is saved in the critical region of the periphery of the receiving bore of the bearing housing.

On the other hand, a very advantageous combination of the functionalities of the integrated cavities is created. Viewed spatially, a section of the lubricant supply duct, ie a duct section, provides an ideal configuration for a cavity which is used for introducing a fixing pin into a housing. In terms of time, the locating pin is inserted and fastened once or before commissioning, so that later during operation a corresponding channel section is no longer blocked or impaired by the locating pin and a complete opening cross section of the lubricant supply channel is again available for supplying a lubricant. The advantageous embodiment of a spatial integration and functional combination of the cavity and the lubricant supply channel within a radially inward portion of the two needs in the Production of the bearing housing section to be provided and formed only a correspondingly designed cavity for inserting the locating pin and for supplying a lubricant.

In addition, it can be advantageous if the lubricant supply channel has a branch which, in relation to the shaft, leads to the shaft bearing on both axial sides of the outer fixing pin receptacle of the bearing housing section. This design enables an axially distributed supply of lubricant to the shaft bearing, i.e. to at least two bearing points or rows of roller bearings. Nevertheless, a length of a common portion of the lubricant supply passage and the cavity is maximized. In other words, this means that the need for additional installation space for the axial distribution of the lubricating oil supply is minimized.

There can be advantages if a ring section of the locating pin assigned to the bearing outer ring has a smaller diameter than a housing section of the locating pin assigned to the bearing housing section. In this way, with appropriately adapted diameters of the locating pin receptacles, a stop for an insertion depth of the locating pin in the bearing housing section results at a component boundary between the bearing housing section and the bearing outer ring.

In addition, the fixing pin can be guided or inserted more easily through the two fixing pin receptacles over its entire length. Furthermore, a tolerance or positional deviation in relation to an alignment of the two locating pin receptacles in the bearing housing section and the bearing outer ring can be corrected more easily by inserting the locating pin, the smaller the diameter at the front end of the locating pin.

A further advantage can result if a thread is formed on the inner fixing pin receptacle of the bearing outer ring and on the associated ring section of the fixing pin for fastening in the bearing outer ring. Such a screw connection makes it easier for the fixing pin in the form of a fixing screw to be brought into its end position by turning, i.e. up to a stop of a screw head in the inner fixing pin receptacle. Furthermore, after assuming the fixing position of the shaft bearing and the fixing pin in the bearing housing section, there is an axially secured connection between the fixing pin and the bearing outer ring. This can prevent the fixing pin from loosening or moving out in the event of vibrations during operation.

Alternatively, it can be advantageous if a press fit is formed between the inner locating pin receptacle of the bearing outer ring and the associated ring section of the locating pin for attachment in the bearing outer ring. In this alternative embodiment, a production step of thread cutting for the aforementioned threaded section and a work step for screwing in the fixing pin by means of a screwing tool during assembly are omitted. Positional fixation can be provided, for example, by providing a press fit.

It can also be advantageous if a loose fit is formed between the outer locating pin receptacle of the bearing housing section and the associated housing section of the locating pin. Adequate positional fixing can also be provided here in the form of a press fit of a screw head of a fixing pin designed as a screw or of a fixing pin inserted by means of a fit.

In addition, it can be advantageous if an axial bore is formed in the fixing pin. With this configuration, a further branched channel can be provided as an extension of the lubricant supply channel, through which the lubricant is introduced into the bearing outer ring.

There are further advantages if a stop surface that is perpendicular or essentially perpendicular to an axis of the inner fixing pin receptacle is formed in an outer lateral surface of the bearing outer ring around an opening in the inner fixing pin receptacle. This configuration provides a defined stop against which a step between two different diameters of the fixing pin when it is inserted or a screw head of the same when it is screwed in runs against it.

Furthermore, it can be advantageous if the shaft bearing comprises a plurality of rolling bodies, which are guided circumferentially in raceways between the bearing inner ring and the bearing outer ring, the rolling bodies being lubricated with lubricant through the lubricant supply channel. By using a roller bearing type in the bearing arrangement according to the invention, low friction is achieved, which can be used in favor of higher possible speeds. The friction is further reduced by the lubricant supply of the lubricant supply channel.

As an alternative to this, it can be advantageous if the shaft bearing comprises at least one radial pair of sliding surfaces on the bearing inner ring and the bearing outer ring, with a plain bearing gap between the pair of sliding surfaces being formed by the lubricant feed channel is lubricated with lubricant. By using a plain bearing type in the bearing arrangement according to the invention, a lower surface pressure is achieved at the bearing points, which can be used in favor of higher possible loads on the shaft. Maintaining a lubricating film in the plain bearing gap between the pair of sliding surfaces is ensured by the lubricant supply of the lubricant supply channel.

A further object of the present invention is a turbomachine, having a bearing arrangement according to the invention for a shaft, which is arranged between a conveyor housing section and a drive side of the turbomachine. A method for assembling the bearing arrangement according to the invention in a turbomachine also represents a further subject matter of the present invention. A turbomachine according to the invention and an assembly method according to the invention thus bring with them the same advantages as have been explained in detail with reference to a bearing arrangement according to the invention.

The advantages explained can preferably be used in a turbomachine such as a turbo compressor with a turbine impeller, in particular an exhaust gas turbocharger for an internal combustion engine.

• 1 eine Schnittansicht durch einen Aufbau einer Lageranordnung gemäß einer Ausführungsform der Erfindung.

Further advantages, features and details of the invention result from the following description, in which an exemplary embodiment of the invention is described in detail with reference to the drawing. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. It shows schematically:

• 1 a sectional view through a structure of a bearing assembly according to an embodiment of the invention.

In 1 a longitudinal section through a shaft 30 is shown, showing a structure of a bearing arrangement 10 according to the invention in a turbomachine 100. In the exemplary embodiment explained below, turbomachine 100 is an exhaust gas turbocharger, which is driven by an exiting exhaust gas flow from an internal combustion engine and compresses a charge air flow entering the internal combustion engine. The turbomachine 100 is driven by a drive device, not shown, which is arranged on a left-hand drive side of the shaft 30 and is designed, for example, as a turbine drive wheel arranged in an exhaust gas flow. In order to convey or suck in and compress an air flow, an impeller 40 is arranged on the right-hand side of the shaft 30, which is designed in particular as a radially outwardly accelerating turbine impeller with internal vanes and a central inlet. A delivery housing section 14 of the housing of the turbomachine 100 accommodates an inlet (not shown) and an outlet of the turbomachine 100 as well as the impeller 40 in a delivery chamber located between them.

A bearing housing section 12 of the housing of the turbomachine 100 is arranged between the drive side and the conveyor housing section 14 and is set up to accommodate a shaft bearing 20 . The shaft bearing 20 rotatably supports the shaft 30 in the bearing housing portion 12 of the housing of the turbomachine 100 .

In the exemplary embodiment shown, the shaft bearing 20 is a roller bearing with spherical roller bodies 22, and it is designed as a compact bearing unit with two rows of roller bearings. This configuration enables tilting moments on the shaft 30 to be absorbed by a stand-alone compact bearing unit in a central shaft section, which means that further bearing points at the shaft ends and a corresponding axial installation space for this can be eliminated. The shaft bearing 20 is composed essentially of a cylindrical bearing outer ring 21, a cylindrical bearing inner ring 23 and the rolling elements 22 that are guided in a circumferential manner in between. The bearing outer ring 21 is supported statically in a corresponding receiving bore of the bearing receiving section 12, into which the shaft bearing 20 is introduced or fitted for assembly. The bearing inner ring 23 is supported dynamically or rotatably in the bearing inner ring 21 via the roller bearing 22 and has a receiving bore into which the shaft 30 is introduced or fitted for assembly. Seals, not explained further, are provided at the axial ends of the shaft bearing 20 , which seal the interior of the bearing housing 12 against the escape of a lubricant and against the ingress of dirt or against the entry of a medium from the drive side or from the delivery housing section 14 .

A lubricant supply channel 13 is formed in the bearing housing section 12 . The lubricant feed duct 13 is a section of a lubricant circuit, not explained further, which supplies a lubricant, in particular a lubricating oil, for lubricating the rolling elements 22 through openings in the bearing outer ring 21 on a side shown above the shaft bearing 20 and for damping rotating components through gaps between the bearing outer ring 21 and feeds the conveyor housing section 14 and at a below shown frame ten side of the same dissipates again. The lubricant supply channel 13 leads radially inward from the side shown above the shaft bearing 20 to an axially central area of the shaft bearing 20 and branches off in front of the shaft bearing 20 in the direction of the two axially spaced rows of roller bearings to corresponding openings in the bearing outer ring 21.

Furthermore, a cavity 11 is formed in the bearing housing section 12, which is used for mounting a fixing pin 60, which is inserted from an outside of the bearing housing section 12 through the cavity 11 into the bearing housing section 12, and at an inner end of the cavity 11 with the bearing outer ring 21 of the shaft bearing 20 is engaged. Cavity 11 is produced in the form of a bore, which is directed radially inward toward shaft 30 from an outside of bearing housing section 12, shown above shaft bearing 20, and opens with a constant cylindrical cross-section into a receiving bore in bearing housing section 12 for shaft bearing 20. A central axis of the bore of the cavity 11 or also a mounting axis of the fixing pin 60 intersect perpendicularly with a central axis of the shaft 30 or equivalently with a central axis of the receiving bore for the shaft bearing 20 in the bearing housing section. Furthermore, the bore of the cavity 11 directed radially inward to the shaft 30 shares a common section with a flow path of the lubricant supply channel 13 before this divides in the branching in the direction of the rows of roller bearings. In other words, the cavity 11 also forms part of the lubricant supply channel 13, and the design in the form of a bore facilitates the introduction of the fixing pin on the one hand and promotes a function as a channel section of the lubricant supply channel 13 on the other hand, through which a lubricant flows during operation.

The fixing pin 60 is arranged radially inwards substantially in the center of an axial extension of the shaft bearing 20 . The fixing pin 60 has an external thread (not shown) on a ring section 62 directed towards the shaft bearing 20 . The bearing outer ring 21 has an inner locating pin receptacle 26 which is designed as a bore with an internal thread. The inner locating pin receptacle 26 in the bearing outer ring 21 is aligned with the bore of the cavity 11 when the shaft bearing 20 is fitted into the bearing housing section 12 in order to receive the locating pin 60 which is inserted through the cavity 11 . Furthermore, a flat stop surface 24 is recessed radially inside a cylindrical shell of the bearing outer ring 21 and surrounds the inner fixing pin receptacle 26 perpendicularly.

At the opposite end, the fixing pin 60 has a housing section 61 which is designed in the form of a cylindrical screw head with an internal engagement contour for a screwing tool. A diameter of this cylindrical housing section 61 of the fixing pin 60 corresponds approximately to the diameter of the bore of the cavity 11 and is larger than a diameter of the section 62 with the external thread. The inner end of the cavity 11, which is shown below the branching of the lubricant supply channel 13, also has the continuous diameter of the bore of the cavity 11. This area forms an outer locating pin receptacle 16 which encompasses the housing section 61 of the locating pin 60 designed as a cylindrical screw head as a fit which allows the locating pin 60 to be inserted and rotated. In addition, a bore is arranged in the fixing pin 60 through which the lubricant is introduced from the lubricant supply channel 13 into the bearing outer ring 21 so that another branched channel for supplying lubricant to the shaft bearing 20 is provided.

After the locating pin 60 has been inserted, the ring section 62 is screwed into the inner locating pin receptacle 26 of the bearing outer ring 21 until the housing section 61 of the locating pin abuts against the stop surface 24 . The housing section 61 of the locating pin 60 is accommodated in the outer locating pin receptacle 16 of the bearing housing section 12 and releases a common section of the cavity 11 and the lubricant supply channel 13 above its branch. After assembly, the fixing pin 60 and the shaft bearing 20 are in a fixing position in which the bearing outer ring 21 is secured against axial displacement or twisting in relation to the bearing housing section 12 by means of the fixing pin 60 .

In an embodiment that is not shown, a push fit, a press fit or a conical center fit can be provided instead of a thread between the ring section 62 of the locating pin 60 and the inner locating pin receptacle 26 in the bearing outer ring 21 . In an alternative of this embodiment, the two sections 61 and 62 of the locating pin and the two locating pin receptacles 16 and 26 can have the same diameter.

Furthermore, in an embodiment that is not shown, the shaft bearing can be designed as a plain bearing instead of a roller bearing, with a plain bearing gap between a sliding surface of the bearing inner ring 23 and a sliding surface of the bearing outer ring 21 through the lubricant supply channel 13 a lubricating film-forming lubricant is supplied.

Further, a radially inward common portion of the cavity 11 and the lubricant supply channel 13 may be formed in a shape other than a bore suitable for channeling a lubricant and inserting the fixing pin 60 as long as this shape has an accessibility of one required for the fixing pin 60 Assembly tool guaranteed.

The above explanations for the illustrated embodiment and for alternatives thereof describe the present invention exclusively in the context of examples. It goes without saying that individual features of the embodiment and of the alternatives mentioned can be freely combined with one another, insofar as this makes technical sense, without departing from the scope of the present invention.

Reference List

10

bearing arrangement

11

cavity

12

bearing housing section

13

lubricant supply channel

14

conveyor housing section

16

outer locating pin mount

20

shaft bearing

21

bearing outer ring

22

rolling elements

23

bearing inner ring

24

stop surface

26

inner locating pin mount

30

Wave

40

Wheel

60

fixing pin

61

Housing section of the locating pin

62

Ring section of the locating pin

100

flow machine

Claims (15)

Bearing arrangement (10) for a shaft (30) in a turbomachine (100), having: a bearing housing portion (12) for receiving a shaft bearing (20) between an impeller (40) and a drive side of the turbomachine (100); a shaft bearing (20) for mounting the shaft (30) on the bearing housing section (12), with a rotatable bearing inner ring (23) for receiving the shaft (30) and with a static bearing outer ring (21) which is received in the bearing housing section (12). is; a fixing pin (60) for at least axial fixing and/or rotational fixing of the bearing outer ring (21) on the bearing housing section (12), which is fixed in a fixing position of the bearing arrangement (10) in an inner fixing pin receptacle (26) of the bearing outer ring (21) and itself extends into an outer locating pin receptacle (16) of the bearing housing section (12); whereby a cavity (11) is formed in the bearing housing section (12) which is open to an outside thereof and which, in the fixing position of the bearing arrangement (10), passes through the outer fixing pin receptacle (16) of the bearing housing section (12) to the inner fixing pin receptacle (26) of the bearing outer ring (21) leads. Bearing arrangement (10) for a shaft (30) in a turbomachine (100). claim 1 , characterized in that the bearing housing section (12) comprises at least one lubricant supply channel (13) for supplying a lubricant to the shaft bearing (20), the cavity (11) and the lubricant supply channel (13) overlapping. Bearing arrangement (10) for a shaft (30) in a turbomachine (100). claim 1 , characterized in that the bearing housing section (12) comprises a lubricant supply channel (13) for supplying a lubricant to the shaft bearing (20), wherein the cavity (11) at the same time as a relative to the shaft (30) directed radially inward section of the lubricant supply channel ( 13) is set up. Bearing arrangement (10) for a shaft (30) in a turbomachine (100). claim 2 or 3 , characterized in that the lubricant supply channel (13) has a branch which, in relation to the shaft (30), leads to the shaft bearing (20) on both axial sides of the outer fixing pin receptacle (16) of the bearing housing section (12). Bearing arrangement (10) for a shaft (30) in a turbomachine (100) according to one of the preceding claims, characterized in that a ring section (62) of the fixing pin (60) assigned to the bearing outer ring (21) has a smaller diameter than a the housing section (61) of the fixing pin (60) associated with the bearing housing section (12). Bearing arrangement (10) for a shaft (30) in a turbomachine (100). claim 5 , characterized in that a thread is formed on the inner fixing pin receptacle (26) of the bearing outer ring (21) and on the associated ring section (62) of the fixing pin (60) for fastening in the bearing outer ring (21). Bearing arrangement (10) for a shaft (30) in a turbomachine (100). claim 5 , characterized in that a press fit is formed between the inner locating pin receptacle (26) of the bearing outer ring (21) and the associated ring section (62) of the locating pin (60) for attachment in the bearing outer ring (21). Bearing arrangement (10) for a shaft (30) in a turbomachine (100). claim 6 or 7 , characterized in that between the outer locating pin receptacle (16) of the bearing housing section (12) and the associated housing section (61) of the locating pin (60) a clearance fit is formed. Bearing arrangement (10) for a shaft (30) in a turbomachine (100) according to one of claims 2 until 8th , characterized in that an axial bore is formed in the fixing pin (60). Bearing arrangement (10) for a shaft (30) in a turbomachine (100) according to one of the preceding claims, characterized in that in an outer lateral surface of the bearing outer ring (21) around an opening of the inner locating pin receptacle (26) around, in relation to abutment surface (24) perpendicular or substantially perpendicular to an axis of the inner fixing pin receptacle (26). Bearing arrangement (10) for a shaft (30) in a turbomachine (100) according to one of claims 2 until 10 , characterized in that the shaft bearing (20) comprises a plurality of rolling bodies (22) which are guided circumferentially in raceways between the bearing inner ring (23) and the bearing outer ring (21), the rolling bodies (22) passing through the lubricant supply channel (13) lubricated with lubricant. Bearing arrangement (10) for a shaft (30) in a turbomachine (100) according to one of claims 2 until 10 , characterized in that the shaft bearing (20) on the bearing inner ring (23) and the bearing outer ring (21) comprises at least one pair of radial sliding surfaces, a sliding bearing gap between the pair of sliding surfaces being lubricated with lubricant through the lubricant supply channel (13). Fluid flow machine (100) for conveying a fluid flow, comprising: a shaft (30) on which is mounted an impeller (40) for accelerating the flow of fluid; a conveyor housing section (14) having an inlet and an outlet for fluid flow and a conveyor chamber in which the impeller (40) is received; and a bearing arrangement (10) according to any one of the preceding claims, the bearing housing section (12) of which is arranged between the conveyor housing section (14) and a drive side of the shaft (30). Flow machine (100) after claim 12 , characterized in that the turbomachine (100) is a turbo compressor with a turbine wheel, in particular an exhaust gas turbocharger for an internal combustion engine. Method for assembling a bearing arrangement (10) according to one of Claims 1 until 12 in a turbomachine (100), comprising the steps of: inserting the shaft bearing (20) into the bearing housing section (12); aligning the bearing outer ring (21) with respect to an axial direction and a circumferential direction thereof until coaxial alignment of the inner locating pin receptacle (26) of the bearing outer ring (21) with the outer locating pin receptacle (16) of the bearing housing section (12) is essentially achieved; Inserting the locating pin (60) through the cavity (11) and the outer locating pin receptacle (16) to the inner locating pin receptacle (26); and securing the locating pin (60) in the inner locating pin receptacle (26) until it is in the locating position.

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