JP6284495B2 - Method for the production of a rotor device for a vacuum pump and a rotor device for a vacuum pump - Google Patents

Description

  The present invention relates to a method for producing a rotor device for a vacuum pump, in particular a turbomolecular pump, and to a rotor device for a vacuum pump, in particular a turbomolecular pump.

  Vacuum pumps, such as turbomolecular pumps, are used to create the necessary vacuum for each process in various areas of technology, such as semiconductor manufacturing. The turbo-molecular pump typically has one rotor shaft, a plurality of rotor disks connected to the rotor shaft, and a plurality of stator disks disposed between the rotor disks. At that time, each of the rotor disk and the stator disk has a plurality of blades. These vanes form a pumping structure and provide the desired pumping action during high speed rotation of the rotor device relative to the stator.

  In order to connect the rotor disk to the rotor shaft in a non-rotatable manner, it is known to shrink fit the rotor disk onto the rotor shaft. Patent documents 1 and 2 disclose alternative methods. In this method, the rotor disk is non-rotatably connected to the rotor shaft by one clamping ring.

  Patent Document 3 discloses a turbo molecular pump having a plurality of rotor disks. These rotor disks are surrounded by a cylindrical reinforcing tube without play on the outside. Reinforcing tubes are used to increase the strength of the rotor and to reduce the so-called “burst”, ie the risk of damage to the rotor, or the free breaking force.

  The non-rotatable connection between the rotor disk and the rotor shaft has a limited strength in known vacuum pumps, so that the maximum speed and torque at which these vacuum pumps are operated, and consequently The pump performance achievable with vacuum pumps is limited.

European Patent Application Publication No. 1 096 152 A2 European Patent Application No. 0 967 405 A2 International Publication No. 2009/049988 A1 Specification

  The object of the present invention is therefore to produce a rotor device for vacuum pumps, in particular turbomolecular pumps, which compensates for high pump performance and in particular can be operated at high rotation and high torque without danger. It is to provide one way that is possible. It is a further object of the present invention to provide a corresponding rotor device for a vacuum pump.

  This problem is solved by a method having the features of claim 1.

  The method is for the manufacture of a rotor device for a vacuum pump, in particular a turbomolecular pump, having a rotor shaft, at least one rotor disk connected to the rotor shaft, and at least one reinforcing ring surrounding the rotor disk. Used for. The method includes the formation of a transverse crimp connection crimp connection (German: Querpressverbindung), in particular a stretch crimp connection (German: Deutschpressverbindung) or a contraction crimp connection (German: Schrumfpressverbundung) between the reinforcing ring and the rotor disk. .

  With a transverse crimp connection, the reinforcing ring and the rotor disk can be connected to each other with high strength over a long period of time. A vacuum pump having a reinforcing ring and a rotor disk that are transversely crimped to each other can thus be operated at very high rotational speeds or achieve very high torque, so that the vacuum pump provides a high pump. Performance can be achieved.

  The stretch crimp connection between the reinforcing ring and the rotor disk expands (expands) when the rotor disk is cooled and then the reinforcing ring is set or inserted into the rotor disk, when the rotor disk is warmed, And in that case, it can be formed by forming a stretch crimp connection.

  By shrink fitting (German: Aufschlumpfen), the reinforcement ring makes a shrink-fit connection with the rotor disk. This has a very high strength, similar to the stretch crimp connection. In so doing, the reinforcing ring forms the outer element of the shrink crimp connection, as in the stretch crimp connection, and the rotor disk forms the inner element.

  For example, when the rotor disk is shrink fit into the rotor shaft, which ensures that the rotor disk sits more securely on the rotor shaft, the connection between the rotor disk and the reinforcing ring is based on its extremely high strength, An apparently stronger connection is made with the rotor shaft than would be possible with the rotor disk alone. The rotor device produced in the method thus has a very high strength and can be operated at high rotational speeds and torques without problems. These allow for high pump performance. The risk of bursting is significantly reduced by the reinforcement provided by the reinforcement ring, so that reliable operation of the vacuum pump is compensated even at high pump performance.

  Advantageous embodiments of the invention are described in the subclaims, the description and the drawings.

  In order to form a transverse crimp connection between the reinforcing ring and the rotor disk, it is advantageous if the rotor disk is cooled and the reinforcing ring is subsequently attached to the cooled rotor disk. When the rotor disk is warmed again, a transverse crimp connection is formed between the reinforcing ring and the rotor disk.

  Advantageously, the reinforcing ring is heated and then mounted on the rotor disk to form a shrink crimp connection. When the reinforcing ring is cooled again, it shrinks and in doing so forms a shrink crimp connection with the rotor disk.

  In order to form a transverse crimp connection between the rotor disk and the reinforcing ring seated on it, the outer diameter of the rotor disk and the inner diameter of the reinforcing ring are preferably in the form of a press fit (German: Presspassing). Is formed. This ensures that the transverse crimp connection produces a high rotational strength between the rotor disk and the reinforcing ring.

  According to an advantageous embodiment, the rotor disk has two axial ends. Here, at both shaft ends, one reinforcing ring is attached to the rotor disk and a transverse crimp connection is formed between each reinforcing ring and the rotor disk. The use of two reinforcing rings at both axial ends of the rotor disk additionally increases the strength of the reinforced rotor disk and the connection between the rotor disk and the rotor shaft tube.

  The transverse crimp connection can in principle include heating of the outer component, i.e. the reinforcement ring, and / or can include cooling of the inner component, i.e. the rotor disk. Each component is then heated or cooled to a temperature clearly above or below room temperature. In particular, the cooling of the rotor disk is performed using, for example, liquid nitrogen.

  Preferably, the reinforcing ring is connected to exactly one rotor disk. In other words, the reinforcing ring is not connected to more than one rotor disk, but only to one rotor disk. The reinforcing ring is thus attached to exactly one rotor disk. In this embodiment, the reinforcing ring can be handled independently of other rotor disks, and in particular can be connected to the rotor shaft. As will be described later, this makes it possible to assemble the entire rotor device in a particularly simple manner.

  The method preferably includes a non-rotatable connection with the rotor shaft of the rotor disk. The connection is preferably made by crimping the reinforcing ring in a transverse direction with the rotor disk.

  According to an advantageous embodiment, the rotor disk is attached to the rotor shaft, in particular by means of a transverse crimp connection with the reinforcing ring. For this purpose, preferably a transverse crimp connection, in particular a stretch crimp connection or a shrink crimp connection, is formed between the rotor disk and the rotor shaft. Thus, for example, a shrink crimp connection can be formed between the rotor disk and the rotor shaft. In this case, the rotor disk means the outer component of the shrink crimp connection and the rotor shaft means the inner component. If the reinforcement ring has already been shrink-fitted to the rotor disk, for example, the rotor disk and the rotor disk can be A clearly high strength of the connection between the rotor shafts is achieved.

  The transverse crimp connection of the rotor disk to the rotor shaft can include heating of the outer component, i.e., the rotor disk, and / or cooling of the inner component, i.e., the rotor shaft. In doing so, heating or cooling can include heating or cooling to a temperature clearly above or below room temperature. Cooling is performed using liquid nitrogen.

  According to an advantageous embodiment, the transverse crimp connection or the stretch crimp connection of the rotor disk onto the rotor shaft comprises cooling of the rotor shaft. Heating of the rotor disk can be performed additionally or not in this manner. The cooling of the rotor shaft is advantageous. This is because the cooled rotor shaft is significantly more deformable than the correspondingly heated rotor disk with the reinforcing ring, which reduces the thermal expansion of the rotor disk. Because it is possible.

  The method is preferably used for the manufacture of a rotor device having a plurality of rotor disks connected to a rotor shaft. These rotor disks are preferably phase-continuous in the axial direction. Correspondingly, a plurality of rotor disks are mounted on the rotor shaft according to an advantageous embodiment. Preferably, at least one reinforcing ring is attached to each of the plurality of rotor disks. In particular, it is attached in particular by a transverse crimp connection in the manner described above with respect to at least one rotor disk. In this case, for example, shrink fitting of the reinforcing ring to the rotor disk is performed before attaching each rotor disk to the rotor shaft. In order to attach the rotor disk to the rotor shaft, the plurality of rotor disks can be crimped transversely to the rotor shaft in the manner described above for at least one rotor disk.

  According to an advantageous embodiment, the rotor disk is connected to the rotor shaft in one common process. For this reason, the rotor shaft is cooled, and the plurality of rotor disks are consequently attached to the rotor shaft, so that the plurality of rotor disks are commonly connected to the rotor shaft during subsequent heating of the rotor shaft. It is possible. The costs for the production of the rotor device are thereby kept low.

  According to an advantageous embodiment, the rotor disks are individually mounted on the rotor shaft and in particular are transversely crimped with the rotor disk. This means that the rotor disks are mounted separately on the rotor shaft without the rotor disks being independent of one another. The independence of the plurality of rotor disks guarantees easy handling when mounted on the rotor shaft and a good connection between the rotor disk and the rotor shaft.

  The method described herein for manufacturing a rotor device is basically a component of a method for manufacturing a vacuum pump having the rotor device. The subject of the invention is therefore also a method for the manufacture of a vacuum pump, including the manufacture of a rotor device according to the method described in this specification.

  According to an advantageous embodiment, the rotor disks are mounted on the rotor shaft such that they alternate in the axial direction with the stator disks located between the rotor disks in the vacuum pump. In that case, the stator disk is preferably provided or provided in the housing of the vacuum pump. As a result, the rotor shaft also extends through the rotor disk, extends through the stator disk, which is located alternately in the axial direction with the rotor shaft, and provides an arrangement suitable for use in, for example, a turbomolecular pump.

  Since the stator disk can be inserted through the rotor shaft and inserted between the rotor disks, the rotor disk can be inserted between the rotor disks after complete assembly of the rotor apparatus. There is no need to use separate stator disks that are assembled into Instead, it is possible to use stator disks that are each connected in one piece and that are formed in particular by a unitary material structure. One-part stator disks can each have one through opening. During the production of the rotor device, the rotor shaft is guided through this opening. The production of the vacuum pump is thereby greatly simplified. This is because the rotor device and the stator disk can be assembled in one common method step.

  The reinforcing ring can be made completely or partly of one material. This material is different from the material of at least one rotor disk. In particular, the reinforcing ring has one material that has a higher strength than the material of the rotor disk in at least one direction, in particular the circumferential direction of the reinforcing ring. This achieves a particularly high strength of the connection consisting of the reinforcing ring and the rotor disk.

  Particularly good results regarding the strength of the connection and the pump performance achievable by the rotor device are at least 500 MPa, preferably at least 600 MPa, particularly preferably at least 700 MPa, and most preferably in at least one direction, in particular the circumferential direction of the reinforcing ring This is achieved when the reinforcing ring is made completely or partially from one material having a tensile strength of 800 MPa. Preferably, a material having a tensile strength higher than 700 MPa is used.

  According to an advantageous embodiment, the reinforcing ring consists entirely or partly of fiber reinforced plastic, in particular carbon fiber reinforced plastic (CFK). Preferably, the plastic has high toughness (English: Super Tenacity) fibers that have higher strength than high toughness fibers. Based on the high strength of this material, a particularly rigid connection is achieved between the reinforcing ring and the rotor disk and between the rotor disk and the rotor shaft.

  The rotor disk and / or the rotor shaft and / or the at least one stator disk can consist entirely or partly of one metal material. The metallic material can include aluminum or be formed of aluminum or an aluminum alloy. The rotor disk and / or the at least one stator disk are preferably formed by a structure that is related to one part and that is particularly materially uniform. This structure can be produced by a process, in particular a cutting process, that removes the material from the tube.

  A particularly rigid connection between the reinforcing ring and the rotor disk is that the reinforcing ring and the rotor disk are between 0.0005 and 0.04 mm, preferably between 0.0008 and 0.03 mm, and particularly preferably 0 at room temperature. Achieved when having a radial surplus between .001 and 0.025 mm. A particularly rigid connection between the rotor disk and the rotor shaft is particularly preferred when the reinforced rotor disk and rotor shaft are between 0.01 and 0.1 mm, preferably between 0.02 mm and 0.08 mm, and especially at room temperature. More preferably, it is achieved when it has a radial surplus between 0.04 and 0.06 mm.

  The reinforcing ring can be attached to the rotor disk so that the connection that occurs has a cylinder side-shaped contact area between the radially inner surface of the reinforcing ring and the radially outer surface of the rotor disk. In the contact area, the reinforcing ring and the rotor disk are pressed against each other. The rotor disk can be attached to the rotor shaft such that the connection that occurs is that the rotor disk has a cylindrical side-shaped contact area between the radially inner surface of the rotor disk and the radially outer surface of the rotor shaft. . In this contact area, the rotor disk and the rotor shaft are pressed against each other.

  Preferably, the rotor disk is formed as a turbomolecular rotor disk. The rotor disk can have one carrier ring and a plurality of blades projecting radially from the carrier ring. This forms the mount for the rotor disk. The carrier ring can form a bundle for the rotor disk blades. The carrier ring preferably has one through opening. The rotor shaft of the completed rotor device extends through this opening.

  The reinforcing ring is attached to the bearing ring of the rotor disk and can be stretched or crimped in particular, so that the radially outer side of the bearing ring and the radially inner side of the reinforcing ring are transversely crimped. The contact area is formed. The carrier ring can have two axial ends, and can have one portion at one or both axial ends, each projecting axially beyond the mount. One or both of these parts can each be provided with a single reinforcing ring, for example shrink-fitted or stretch-bonded.

  The rotor shaft is preferably formed by a rod-shaped structure, preferably a solid body, preferably having a circular cross section. The rotor shaft can be supported in the vacuum pump so as to be rotatable about the rotation shaft. In so doing, the axis of rotation preferably coincides with the longitudinal axis of the rotor axis.

  A further feature of the present invention is a rotor device for a vacuum pump, in particular a turbo molecular pump, which comprises a rotor shaft, a rotor disk connected to the rotor shaft, and an outer rotor disk. It has a single reinforcing ring that surrounds it, the reinforcing ring being connected to the rotor disk by means of a transverse crimp connection, in particular by means of an extension crimp connection or a shrink crimp connection. The rotor device is preferably manufactured or manufacturable by a method for manufacturing a rotor device according to the present description. Advantageous embodiments and advantages of the method according to the invention described here represent corresponding advantageous embodiments and advantages of the rotor device according to the invention. The rotor device stands out by a special rigid connection between the rotor disk and the rotor shaft. This connection ensures that the rotor disk sits firmly on the rotor shaft even at very high speeds, so that the vacuum pump can be driven at very high speeds and is high Pump performance can be provided.

  According to an advantageous embodiment, the rotor disk has two axial ends. Here, at both axial ends, one reinforcing ring is attached to the rotor disk, and a transverse crimp connection is formed between each reinforcing ring and the rotor disk.

  The rotor disk can be connected to the rotor shaft via a transverse crimp connection, in particular via a stretch crimp connection or a shrink crimp connection. Thus, the rotor disk is preferably shrink fitted on the rotor shaft, or obtained and crimped with it. The reinforcing ring is preferably connected to exactly one rotor disk, i.e. preferably, the reinforcing ring is not connected to more than one rotor disk and is therefore connected only to a single rotor disk. ing. In principle, a plurality of rotor disks can be attached to the rotor shaft and in particular can be shrink-fit or stretch-bonded.

  The rotor device can be part of a vacuum pump, in particular a part of a turbomolecular pump. The subject of the invention is therefore also a vacuum pump, in particular a turbomolecular pump, having a rotor device according to the present description.

  Preferably, in the axial direction in the vacuum pump, the plurality of rotor disks connected to the rotor shaft are alternately positioned with the stator disks arranged between the rotor disks. These stator disks are fixed to a vacuum pump, for example, a housing of the vacuum pump.

  The stator disk is preferably formed as a one-piece united and in particular a unitary material structure. The stator disk preferably has a single through opening. A rotor shaft extends through this opening.

  It is preferred if the at least one reinforcing ring consists entirely or partly of fiber reinforced plastic, in particular of carbon fiber reinforced plastic (CFK). The plastic may have HT fibers or ST fibers.

The rotor disk or disks are preferably formed as a turbomolecular rotor disk.

  The vacuum pump according to the invention has a rotor device as described above. In this case, the rotor shaft is preferably supported at two axial ends so as to be rotatable about one rotational shaft. In this case, the one or more rotor disks can be attached to the rotor shaft in the part of the rotor shaft arranged between the two bearings. In this case, one bearing part can be formed as a rolling bearing part, and / or one bearing part, particularly attached to the high vacuum side of the pump, is particularly permanent as a magnet bearing part. It can be formed as a magnet bearing.

  In the following, the invention will be described by way of example on the basis of advantageous embodiments with reference to the accompanying drawings. The figure shows:

Side view of one rotor disk, one rotor shaft and two reinforcing rings for the manufacture of a rotor device according to a method according to one embodiment of the invention 1 is a top view of a rotor device according to one embodiment of the invention. FIG. 1 also shows a vacuum pump having a rotor device according to one embodiment of the present invention in a sectional view of a partial view.

  FIG. 1 shows a rotor shaft 10 extending along a shaft 20, a non-rotatably connected rotor shaft 10, and a plurality of vanes protruding radially from the carrier ring 22 and a plurality of carrier rings. A rotor disk 12 having 24 is shown. The blades form a mount for the rotor disk 12. The rotor shaft 10 has a radial surplus on the opposite side of the opening for accommodating the rotor shaft 10 formed by the carrier ring 22. In addition, two reinforcing rings 14 for the rotor disk 12 are represented, which have a radial surplus opposite the axial end portion of the rotor disk 12.

  For the manufacture of the rotor device, first both reinforcing rings 14 form a transverse crimp connection, in particular in the form of a stretch crimp connection, on each part protruding axially beyond the mount of the rotor disk 12. It is attached while. For this reason, since the rotor disk 12 is cooled, the rotor disk 12 is contracted. Subsequently, the reinforcing ring 14 is shifted onto both axial end portions of the rotor disk 12. In so doing, the radial surplus is compensated for by contraction of the rotor disk 12, so that the reinforcing ring 14 can be mounted on the rotor disk 12 without substantial resistance. When the rotor disk 12 is subsequently warmed again to room temperature and then expanded again, a very rigid and reliable stretch crimp connection is automatically created between the rotor disk 12 and the reinforcing ring 14.

  The reinforcing ring 14 can also be shrink fitted onto each protruding portion of the rotor disk 12. For this reason, as each reinforcing ring is heated, it expands and the radial surplus of each protruding part is compensated, and each reinforcing ring 14 can thereby be inserted without substantial resistance. When the reinforcing ring is contracted, a very rigid shrink crimp connection is automatically formed between each reinforcing ring 14 and the rotor disk 12.

  After attaching the reinforcing ring 14 to the rotor disk 12, the rotor disk 12 is shrink-fitted onto the rotor shaft 10 together with the reinforcing ring 14 or is stretch-bonded. Thus, for example, as the rotor shaft 10 is cooled, the rotor shaft 10 contracts and has a smaller outer diameter. This outer diameter basically corresponds to the inner diameter of the rotor disk 12. In this state, the rotor disk 12 can be mounted on the rotor shaft 10 without having an intrinsic resistance. As the rotor shaft 10 is consequently warmed again to room temperature and expanded again, a very rigid and secure crimp connection is automatically created between the rotor disk 12 and the rotor shaft 10.

  FIG. 1 exemplarily shows only one rotor disk 12, but preferably a plurality of rotor disks 12 are individually attached to the cooled rotor shaft 10 and subsequently the rotor shaft 10. Are warmed up to room temperature, are commonly connected to the rotor shaft 10 and thus form a plurality of rotor disks 12 and one rotor device which are axially continuous.

  FIG. 2 shows one rotor device as a top view. This rotor device can be manufactured by the method described above with reference to FIG. Between the radially inner surface of the reinforcing ring 14 and the radially outer surface of the bearing ring 22 of the rotor disk 12 and between the radially inner surface of the bearing ring 22 of the rotor disk 12 and the radially outer surface of the rotor shaft 10. Each has one transverse crimp connection. This presses the aforementioned surfaces together to ensure that the rotor disk 12 sits firmly and very reliably on the rotor shaft 10.

  FIG. 3 shows a vacuum pump having a rotor device with a plurality of rotor disks 12. The rotor disk is mounted on one common rotor shaft 10 in the manner described above with reference to FIGS. When mounting the rotor disk 12 on the rotor shaft 10, it is considered that the rotor disk 12 is alternately arranged with the stator disk 16 in the axial direction. The stator disk is fixed to a housing (not shown). Of the stator disk 16, only the blades are shown in FIG. These vanes extend radially inward starting from the bearing ring of the stator disk 16 which is arranged radially outward and carried on the housing of the vacuum pump. The blades 24 of the rotor disk 12 form one turbomolecular pump stage with the blades of the stator disk 16 adjacent in the axial direction. This turbomolecular pump stage provides an axially directed pumping action. In doing so, the reinforcement ring 14 mounted on the rotor disk 12 allows a solid connection between the rotor disk 12 and the rotor shaft 10 to be operated at a very high rotation and high torque without danger to the vacuum pump. As a result, and accordingly, high pump performance can be provided.

  FIG. 3 shows that the reinforcing ring 14 does not protrude beyond the respective supporting rings 22 in the center of the rotor disk 12 in the direction of the axis 20 of the rotor shaft 10, but against the axial end of the supporting ring 22. Indicates to bounce back. Alternatively, a fastening that is at least approximately coplanar in the axial direction can be intended between the axial ends of the reinforcing ring 14 and the carrier ring 22.

  Each reinforcing ring 14 is connected to exactly one and only one rotor disk 12. Between the mutually facing surfaces of the two rotor disks 12 that are directly continuous in the axial direction, only the only reinforcing element attached to both rotor disks 12 is intended, which is substantially tubular or sleeve-shaped. Instead, there are two independent axially spaced two reinforcing rings 14, each of which is attached to exactly one and only one rotor disk 12. Has been.

10 Rotor shaft 12 Rotor disc 14 Reinforcement ring 16 Stator disc 20 Shaft 22 Supporting ring 24 Blade

Claims (10)

One single member type rotor shaft (10), at least one rotor disk is connected to the rotor shaft (10) (12), and has at least one stiffening ring surrounding the rotor disk (12) (14), A method for manufacturing a rotor device for a vacuum pump , comprising:
The method is, between the reinforcing ring (14) and the rotor disc (12), the method comprising one transverse crimp connection is formed,
B over terpolymer disk (12) has a respective one of the bearing ring (22), the bearing ring has two axial ends, the axial end portion of both, each one of the reinforcement ring (14 ) Is attached to the rotor disk (12) and a transverse crimp connection is formed between each reinforcing ring (14) and the rotor disk (12) ;
Reinforcement ring (14) is correctly connected to only one of the rotor disk (12),
The rotor disk (12) is attached to the rotor shaft (10) after a transverse crimp connection with the reinforcing ring (14),
Between the rotor disc (12) and rotor shaft (10), connection is transverse crimp contact formed,
Wherein the Rukoto rotor bearing ring of the disc (12) (22) are connected by transverse crimp connected to one member type rotor axis over the entire length (10). The rotor disk (12) is cooled to form a transverse crimp connection, and then the reinforcing ring (14) is attached to the cooled rotor disk (12). the method of. Shrinkage crimp for formation of the connection, the reinforcement ring (14) is warmed, and the method according to claim 1, characterized in that subsequently shrink-fitted onto the rotor disk (12). A plurality of rotor disks (12) are attached to the rotor shaft (10), forming a stretch crimp connection or a shrink crimp connection between each rotor disk (12) and the rotor shaft (10). Item 4. The method according to any one of Items 1 to 3. 5. A method according to claim 4, characterized in that a plurality of rotor disks (12) are connected to the rotor shaft (10) simultaneously . 6. A method according to claim 4 or 5, characterized in that a plurality of rotor disks (12) are individually attached to the rotor shaft (10). In the vacuum pump, in the axial direction, the position, and a plurality of rotor disks and provided in the housing of the vacuum pump or attached a plurality of stator discs (16) between the rotor disc (12) (12) a method according to any one of claims 4 6, characterized in that alternating. 8. A method according to any one of the preceding claims, characterized in that the reinforcing ring (14) consists entirely or partly of fiber-reinforced plastic. One single member type rotor shaft (10), at least one rotor disk (12) is connected to the rotor shaft (10) and has at least one stiffening ring surrounding the rotor disk (12) (14), vacuum A rotor device for the pump ,
B over terpolymer disk (12) has a respective one of the bearing ring (22), the bearing ring has two axial ends, in the axial end portion of both, each one of the reinforcement ring (14 ) Is attached to the rotor disk (12) and a transverse crimp connection is formed between the reinforcing ring (14) and the rotor disk (12) ;
Reinforcement ring (14) is correctly connected to only one of the rotor disk (12),
Between B over terpolymer disk (12) and rotor shaft (10), connection is transverse crimp contact formed,
Rotor device bearing ring (22) is characterized that it is connected by transverse crimp connected to one member type rotor axis over the entire length (10) of the rotor disc (12). 10. The rotor device according to claim 9, wherein the reinforcing ring (14) does not protrude beyond the rotor disk (12) in the direction of the axis (20) of the rotor shaft (10).

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