Open-end spinning rotor, rotor shaft and rotor cup for an open-end spinning rotor

Abstract

An open-end spinning rotor (1) has a rotor shaft (2) by means of which the open-end spinning rotor (1) can be supported in a bearing (3), in particular in a magnetic bearing, and a rotor cup (4) in which a fiber material can be spun. The rotor shaft (2) and the rotor cup (4) are detachably connected to each other via a coupling device (5), wherein the coupling device (5) includes a magnetic device (6), in particular a permanent magnet, for axially connecting the rotor shaft (2) and the rotor cup (4) as well as a positive-locking connection for torque transmission between the rotor shaft (2) and the rotor cup (4), wherein the positive-locking connection comprises a first coupling profile (8) which is arranged on the rotor shaft (2), and a second coupling profile (9) which is arranged on the rotor cup (4). The first coupling profile (8) and the second coupling profile (9) are designed as multi-round profiles, in particular as six-round profiles.

Description

[0001] The present invention relates to an open-end spinning rotor with a rotor shaft by means of which the open-end spinning rotor can be supported in a bearing, in particular in a magnetic bearing, and with a rotor cup in which a fiber material can be spun, wherein the rotor shaft and the rotor cup are detachably connected to one another via a coupling device. The coupling device includes a magnetic device, in particular a permanent magnet, for axially connecting the rotor shaft and the rotor cup, as well as a positive-locking connection for torque transmission between the rotor shaft and the rotor cup. The positive-locking connection comprises a first coupling profile arranged on the rotor shaft and a second coupling profile arranged on the rotor cup. The invention further relates to a corresponding rotor shaft and a corresponding rotor cup for such an open-end spinning rotor.

[0002] From EP 1 156 142 B1, such a two-part open-end spinning rotor is known, the rotor shaft and rotor cup of which are detachably connected to each other via a coupling device. This allows the rotor shaft to remain installed in the bearing when the rotor cup is removed, which is particularly advantageous in the case of magnetic bearings. The coupling device includes a receiving sleeve arranged in the rotor shaft with an internal polygon that interacts with a corresponding external polygon on the rotor cup.

[0003] The object of the present invention is to propose an open-end spinning rotor which enables reliable torque transmission. Furthermore, a corresponding rotor assembly and rotor shaft are to be proposed.

[0004] The problem is solved by an open-end spinning rotor, a rotor shaft and a rotor cup with the features of the independent patent claims.

[0005] An open-end spinning rotor has a rotor shaft by means of which the open-end spinning rotor can be supported in a bearing, in particular a magnetic bearing, and a rotor cup in which a fiber material can be spun. The rotor shaft and the rotor cup are detachably connected to each other via a coupling device, wherein the coupling device includes a magnetic element, in particular a permanent magnet, for axially connecting the rotor shaft and the rotor cup, as well as a positive-locking connection for torque transmission between the rotor shaft and the rotor cup. The positive-locking connection comprises a first coupling profile, which is arranged on the rotor shaft, and a second coupling profile, which is arranged on the rotor cup.

[0006] For such a spinning rotor, it is proposed that the first and second coupling profiles be designed as multi-round profiles, specifically hexagonal profiles. A particular advantage of the multi-round profile is that jamming of the coupling device can be avoided even under higher torque loads. This also allows for the reliable transmission of higher torques, while reducing the risk of damage to the inner profile compared to a hexagonal or polygonal profile. Overall, the multi-round profile enables the reliable transmission of even higher torques with less wear. This also makes it possible to replace only the rotor cup itself when the yarn-forming surfaces wear out, while continuing to use the rotor shaft.

[0007] The same advantages can of course also be achieved with a corresponding rotor shaft, which can be supported in a bearing, in particular a magnetic bearing, and which has a first part of a coupling device for detachable connection with a rotor cup of the open-end spinning rotor, as well as with a corresponding rotor cup in which a fiber material can be spun and which has a second part of a coupling device for detachable connection with a rotor shaft of the open-end spinning rotor. These are also claimed.

[0008] The rotor shaft comprises a first coupling profile for a positive connection with a second coupling profile of the rotor cup, which is designed as a multi-round profile.

[0009] The rotor cup includes a second coupling profile for a positive connection with a first coupling profile of the rotor shaft, which is designed as a multi-round profile.

[0010] It is particularly advantageous if the first and second coupling profiles are designed as six-round profiles. With respect to the diameter of the rotor shaft or coupling device, a six-round profile is ideally suited to provide a sufficient number of torque-transmitting surfaces. However, it would also be possible, especially with a larger diameter of the coupling device, to provide more than six curved teeth in the first and second coupling profiles. Conversely, it would also be conceivable, particularly with a smaller diameter of the coupling device, to provide fewer than six curved teeth in the first and second coupling profiles.

[0011] It is also advantageous if the first coupling profile, located on the rotor shaft, is designed as an outer multi-round profile, and the second coupling profile, located on the rotor cup, is designed as an inner multi-round profile. This advantageously allows a permanent magnet for axial securing to be positioned directly adjacent to the inner multi-round profile in the rotor cup. Since the rotor cup is handled more frequently than the rotor shaft, and the risk of damage to the coupling profile of the rotor cup is therefore generally greater than that of the rotor shaft, the arrangement of the inner multi-round profile on the rotor cup also provides better protection for the coupling profile of the rotor cup against damage.

[0012] It is particularly advantageous if the first coupling profile, arranged on the rotor shaft, is designed as an external hexagonal profile. Likewise, it is particularly advantageous if the second coupling profile, arranged on the rotor cup, is designed as an internal hexagonal profile.

[0013] Furthermore, it is advantageous if the rotor cup has a receptacle for the magnetic device, in particular the permanent magnet. This makes the permanent magnet easily accessible and therefore particularly easy to replace. Disassembly of the rotor shaft from its bearing is thus unnecessary for replacing the permanent magnet.

[0014] It is particularly advantageous if the receptacle is positioned axially behind the second coupling profile of the rotor cup, offset towards the rotor base. This allows the permanent magnet to be positioned directly behind the coupling profile and thus interact directly with the coupling profile of the rotor shaft. This results in a particularly good and secure axial connection between the rotor shaft and the rotor cup. Furthermore, the permanent magnet is easily accessible for replacement at this location and can be reached simply through the coupling profile. Alternatively, it is also conceivable to position the permanent magnet on the inside of the rotor cup in the rotor base.

[0015] It is also advantageous if the first coupling profile is arranged on a first insert piece that is inserted into the rotor shaft. This simplifies the manufacturing of the coupling profile. Furthermore, designing the coupling profile as an insert piece allows for optimal matching of the materials of the rotor shaft on the one hand and the insert piece on the other. A multi-part design of the rotor shaft also facilitates the integration of other components. For example, a multi-part design allows a permanent magnet for the individual electric drive of the spinning rotor to be arranged inside the rotor shaft. Similarly, specific materials can be used for the bearings of the spinning rotor, while the insert piece with the coupling profile can be made of a harder material, for example.

[0016] It is also advantageous if the second coupling profile is arranged on a projection of the rotor cup or on a second insert piece inserted into the rotor cup. This also allows for optimal matching of the materials of the actual rotor cup on the one hand and the coupling profile on the other. Furthermore, the manufacturing of the coupling profile is also simplified when it is located on an insert piece of the rotor cup.

[0017] It is particularly advantageous if the coupling profile is located on an insert bushing, or if the insert is designed as an insert bushing. In this case, the second insert or insert bushing contains a coupling profile designed as an outer multi-circle and preferably also a receptacle for the magnetic device, in particular the permanent magnet.

[0018] Advantages arise when the rotor shaft has a sleeve that, in the assembled state of the open-end spinning rotor, surrounds the base of the rotor cup and / or the second insert or the insert bushing of the rotor cup. This provides good protection for the coupling device, even during operation of the open-end spinning rotor. If the multi-round profile of the rotor shaft is designed as an outer multi-round profile, the sleeve also provides good protection for the outer multi-round profile. Preferably, the sleeve is integrally formed. This allows the rotor shaft, or a portion thereof, to be manufactured together with the sleeve in a single operation.

[0019] It is also advantageous if the sleeve and the attachment, or the sleeve and the second insert or the insert bushing, each have a centering section and form a centering device for the coupling assembly. This ensures that the rotor cup is automatically correctly centered on the rotor shaft after the coupling assembly is connected.

[0020] Further advantages of the invention are described in the following exemplary embodiments. These show, for example: Figure 1 a schematic, cutaway view of an open-end spinning device with an open-end spinning rotor and a coupling device, Figure 2 a schematic representation of a rotor cup with part of a coupling device in a rear view, Figure 3 a schematic representation of a rotor shaft with part of a coupling device in a side view, Figure 4a schematic representation of a rotor shaft with part of a coupling device in a cutaway side view, Figure 5 a schematic representation of a rotor cup with part of a coupling device and a magnetic device in a cutaway side view, as well as Figure 6 A schematic representation of a rotor cup with an insert which includes part of a coupling device, in a cut side view.

[0021] In the following description of the figures, the same reference symbols are used for features that are identical and / or at least comparable in the various figures. The individual features, their design, and / or mode of operation are usually only explained in detail upon their first mention. If individual features are not explained again in detail, their design and / or mode of operation corresponds to the design and mode of operation of the already described features with the same or identical function. Furthermore, for the sake of clarity, often only one or a few of several identical components or features are labeled.

[0022] Figure 1Figure 1 shows a schematic, sectional view of an open-end spinning device 22 with an open-end spinning rotor 1 and a coupling device 5. The open-end spinning device 22 has an open-end spinning rotor 1, which includes a rotor shaft 2 and a rotor cup 4. The open-end spinning rotor 1 is rotatably mounted in a bearing 3, which is designed as a magnetic bearing, by means of its rotor shaft 2. A fiber material is spun into yarn in the rotor cup 4. The open-end spinning rotor 1 is arranged in the open-end spinning device 22 such that the rotor cup 4 is located in a vacuum-operated rotor housing 17, while the rotor shaft 2 extends through a rear wall of the rotor housing 17 into a bearing housing 18.The open-end spinning rotor 1 shown here is driven by a drive 21, which is designed as a single drive and includes a stator 20 and a magnet 19. The stator 20 with its stator windings is arranged between the two bearing points of the bearing 3.

[0023] Each bearing point of the magnetic bearing shown here includes ring-shaped magnets surrounding the rotor shaft 2, one of which is connected to the rotor shaft 2 and the other to the stator 20. It is therefore quite difficult to remove the open-end spinning rotor 1 as a whole from the open-end spinning device 22. The open-end spinning rotor 1 therefore includes a coupling device 5, so that the rotor cup 4 can be easily detached from the rotor shaft 2 and removed from the open rotor housing 17. Part of the coupling device 5 is arranged on the rotor shaft 2 and part of the coupling device 5 on the rotor cup 4. The coupling device 5 includes a magnetic assembly 6 (see figure). Figures 5 and 6) for the axial connection of rotor shaft 2 and rotor cup 4, as well as a positive-locking connection for torque transmission between the rotor shaft 2 and the rotor cup 4. The positive-locking connection is described below using the Figures 2 and 3 described and comprises a first coupling profile 8, which is arranged on the rotor shaft 2, and a second coupling profile 9, which is arranged on the rotor cup 4.

[0024] Figure 2 Figure 1 shows a schematic representation of a rotor cup 4 with part of a coupling device 5 in a rear view. The rotor cup 4 has a projection 13 extending from a rotor base 11 on its rear side opposite its open end, to which the part of the coupling device 5 (see Figure 1) is attached. Figure 1) is arranged. For this purpose, a multi-round profile is formed on the extension 13 of the rotor cup 4 as a second coupling profile 9 or as part of the coupling device 5. In this case, the multi-round profile is designed as an internal hexagonal profile. This acts complementarily on the rotor shaft 2 (see Figure 3 ) formed outer hexagonal profile together, as shown below using the Figure 3 will be explained.

[0025] Figure 3 Figure 1 shows a schematic representation of a rotor shaft 2 with part of a coupling device 5 in a side view. The part of the coupling device 5 comprises a first coupling profile 8 formed on the rotor shaft 2, which is designed as a multi-round profile. In this case, the multi-round profile is designed as an outer six-round profile, which is complemented by an inner six-round profile formed on the rotor cup 4, as shown in the Figure 2 It is shown how they can interact.

[0026] The two parts of the coupling device 5 can be easily plugged together for assembly. Because the first coupling profile 8 and the second coupling profile 9 are designed as multi-round profiles, the coupling device 5 can reliably transmit high torques. The rounded design of the individual teeth or prongs ensures particularly good power transmission. This prevents misalignment, which can occur, for example, with a hexagonal profile, and the resulting wear.

[0027] The in the Figures 2 and 3The embodiment shown, in which the outer multi-round profile is arranged on the rotor shaft 2 and the inner multi-round profile on the rotor cup 4, is particularly advantageous because the second coupling profile 9 on the rotor cup 4 is thereby well protected. However, it is equally possible to provide the outer multi-round profile on the rotor cup 4 and the inner multi-round profile on the rotor shaft 2. Furthermore, it would also be possible, deviating from the illustration shown, to provide a different multi-round profile for the coupling device 5 instead of a six-round profile.

[0028] Figure 4 Figure 1 shows a schematic representation of a rotor shaft 2 with part of a coupling device 5 in a sectional side view. In contrast to the design of the Figure 3In the rotor shaft 2 shown here, the first coupling profile 8, which is also designed as an external multi-round profile, is arranged on a first insert 12 inserted into the rotor shaft 2. This makes the first coupling profile 8 easier to manufacture and simple to insert into the rotor shaft 2. This multi-part design also makes it possible to optimally match the material of the coupling profile 8 to the purpose of the coupling device 5, while the material of the rotor shaft 2 can be matched, for example, to its use in the bearing 3.

[0029] According to the present illustration, the rotor shaft 2 also has a sleeve 15 which, in the mounted state of the open-end spinning rotor 1, engages the projection 13 or, if necessary, an insert bushing of the rotor cup 4 (see figure). Figures 5 and 6) surrounds. The coupling device 5 is thus well protected when the open-end spinning rotor 1 is mounted. In addition, in this embodiment with the sleeve 15, it is advantageous that an inner surface of the sleeve 15 can simultaneously serve as a centering section 16, which, in conjunction with a centering section 16 on the rotor cup 4 (see Figures 5 and 6 ) ensures optimal centering of the rotor cup 4 relative to the rotor shaft 2.

[0030] According to the present illustration, the sleeve 15 is integrally formed with the rotor shaft 2. However, as an alternative to the illustration shown, it would also be conceivable to provide the sleeve 15 separately and to attach it to the rotor shaft 2, for example, by gluing or otherwise connecting it. Furthermore, deviating from the illustration shown, only the first coupling profile 8 could be provided on a first insert 12, but without a sleeve 15. Another alternative to the illustration shown would be to provide the first insert 12 with an internal multi-round profile as the first coupling profile 8. In this case, it would also be conceivable to combine the insert 12 with the sleeve 15.

[0031] As mentioned at the outset, the coupling device 5 also includes a magnetic device 6 for axial connection between the rotor cup 4 and the rotor shaft 2. The magnetic device 6 can be arranged on the rotor cup 4 or on the rotor shaft 2 and is located in the Figures 1-4 not shown.

[0032] Figure 5 Figure 1 shows a schematic representation of a rotor cup 4 with part of a coupling device 5 and a magnetic device 6 in a sectional side view. According to the design of the Figure 5The rotor cup 4 has a receptacle 10 for the magnetic device 6, which in this case is designed as a permanent magnet. The receptacle 10 is located in the area of ​​the projection 13 of the rotor cup 4. According to the present example, the receptacle 10 is arranged axially behind the second coupling profile 9 of the rotor cup 4, offset towards a rotor base 11 of the rotor cup 4. The receptacle 10 and the second coupling profile 9 can thus be manufactured in a single operation. Furthermore, the magnetic device 6 is easily accessible due to its arrangement behind or adjacent to the coupling profile 9 and can therefore be easily replaced when it reaches the end of its service life. However, contrary to the illustration shown, it would also be possible to arrange the receptacle 10 in the area of ​​the inside of the rotor cup 4 in the rotor base 11.

[0033] The second coupling profile 9 is again designed as an internal multi-round profile in this case. However, it would also be conceivable to design the second coupling profile 9 as an external multi-round profile. In this case, it would also be possible to provide a permanent magnet as a magnetic device 6 inside the external multi-round profile.

[0034] Furthermore, the outer side of the projection 13 forms a centering section 16, which interacts with a centering section 16 of the rotor shaft 2 and thereby correctly centers the rotor cup 4 relative to the rotor shaft 2.

[0035] Figure 6 Figure 1 further shows a schematic representation of a rotor cup 4 with a second insert 14, which includes part of a coupling device, in a sectional side view. As with the rotor cup 4 of the Figure 5The second coupling profile 9 is designed as an internal multi-round profile, and a receptacle 10 for a magnet assembly 6 is arranged behind the second coupling profile 9, offset axially in the direction of the rotor cup 4 towards a rotor base 11. The receptacle 10 and the second coupling profile 9 are, however, arranged on the second insert 14, which can be inserted into a rotor base 11 of the rotor cup 4. As with the rotor shaft 2, the manufacture of the second coupling profile 9 is also facilitated by its integration on an insert 14.

[0036] In this embodiment as well, the outer side of the projection 13 continues to form a centering section 16, which interacts with a centering section 16 of the rotor shaft 2 and thereby correctly centers the rotor cup 4 relative to the rotor shaft 2.

[0037] Contrary to the illustration shown, it would also be conceivable here to provide the receptacle 10 on the insert, but in the area of ​​the rotor base 11 within the inner surface of the rotor cup 4. Furthermore, it would also be possible here to design the second coupling profile 9 as an outer multi-round profile.

[0038] Contrary to the depiction shown, the Figures 5 and 6 According to a modification not shown, it would also be possible to extend the projection 13 or the insert 14 of the rotor cup 4 to form a sleeve 15, which would then surround and protect the coupling device 5 when the open-end spinning rotor 1 is mounted. It is understood that in this case the rotor shaft 2 does not have a sleeve 15, similar to the Figure 3 shown. Furthermore, in this case, part of the outer circumference of the rotor shaft 2 can serve as a centering section 16.

[0039] The present invention is not limited to the embodiments shown and described. Modifications within the scope of the claims are possible, as is a combination of the features, even if these are shown and described in different embodiments. Reference symbol list

[0040] 1 Open-end spinning rotor 2 Rotor shaft 3 Bearing 4 Rotor cup 5 Coupling device 6 Magnet assembly 8 First coupling profile 9 Second coupling profile 10 Mount 11 Rotor base 12 First insert 13 Attachment 14 Second insert 15 Sleeve 16 Centering section 17 Rotor housing 18 Bearing housing 19 Magnet 20 Stator 21 Drive 22 Open-end spinning device

Claims

1. Open-end spinning rotor (1) with a rotor shaft (2) by means of which the open-end spinning rotor (1) can be supported in a bearing (3), in particular in a magnetic bearing, and with a rotor cup (4) in which a fiber material can be spun, wherein the rotor shaft (2) and the rotor cup (4) are detachably connected to one another via a coupling device (5), wherein the coupling device (5) includes a magnetic device (6), in particular a permanent magnet, for axially connecting the rotor shaft (2) and the rotor cup (4) as well as a positive-locking connection for torque transmission between the rotor shaft (2) and the rotor cup (4), wherein the positive-locking connection comprises a first coupling profile (8) which is arranged on the rotor shaft (2), and a second coupling profile (9) which is arranged on the rotor cup (4). characterized by the fact that the first coupling profile (8) and the second coupling profile (9) are designed as multi-round profiles, in particular as six-round profiles.

2. Open-end spinning rotor (1) according to the preceding claim, characterized by the fact that the first coupling profile (8) arranged on the rotor shaft (2) is designed as an external multi-round profile, in particular as an external six-round profile, and the second coupling profile (9) arranged on the rotor cup (4) is designed as an internal multi-round profile, in particular as an internal six-round profile.

3. Open-end spinneret (1) according to one of the preceding claims, characterized by the fact that the rotor cup (4) has a receptacle (10) for the permanent magnet, wherein preferably the receptacle (10) is arranged offset in the axial direction of the rotor cup (4) behind the second coupling profile (9) in the direction of a rotor base (11).

4. Open-end spinning rotor (1) according to one of the preceding claims, characterized by the fact that the first coupling profile (8) is arranged on a first insert (12) inserted into the rotor shaft (2).

5. Open-end spinning rotor (1) according to one of the preceding claims, characterized by the fact that the second coupling profile (9) is arranged on a projection (13) of the rotor cup (4) or on a second insert (14), in particular an insert bushing, inserted into the rotor cup (4).

6. Open-end spinning rotor (1) according to one of the preceding claims, characterized by the fact that the rotor shaft (2) has a preferably one-piece molded sleeve (15) which, in the assembled state of the open-end spinning rotor (1), surrounds the extension (13) and / or the second insert (14), in particular the insert bushing, of the rotor cup (4).

7. Open-end spinning rotor (1) according to one of the preceding claims, characterized by the fact that the sleeve (15) and the extension (13) or the sleeve (15) and the second insert (14) each have a centering section (16) and form a centering device for the coupling device (5).

8. Rotor shaft (2) for an open-end spinning rotor (1), which can be supported in a bearing (3), in particular in a magnetic bearing, wherein the rotor shaft (2) has a first part of a coupling device (5) for detachable connection with a rotor cup (4) of the open-end spinning rotor (1), wherein the coupling device (5) includes a magnetic device (6) for axial connection of rotor shaft (2) and rotor cup (4) as well as a positive-locking connection for torque transmission between the rotor shaft (2) and the rotor cup (4), and wherein the rotor shaft (2) comprises a first coupling profile (8) for positive-locking connection with a second coupling profile (9) of the rotor cup (4), characterized by the fact that the first coupling profile (8) is designed as a multi-round profile, in particular as a six-round profile.

9. Rotor shaft (2) according to the preceding claim, through this characterized that the first coupling profile (8) is designed as an external multi-round profile, in particular as an external six-round profile.

10. Rotor shaft (2) according to one of the preceding claims, characterized by the fact that the first coupling profile (8) is arranged on a first insert (12) inserted into the rotor shaft (2).

11. Rotor shaft (2) according to one of the preceding claims, characterized by the fact that the rotor shaft (2) has a preferably one-piece molded sleeve (15) which, in the assembled state of the open-end spinning rotor (1), surrounds the extension (13) and / or the second insert (14) of the rotor cup (4), wherein the sleeve (15) preferably has a centering section (16).

12. Rotor cup (4) for an open-end spinning rotor (1) in which a fiber material can be spun, wherein the rotor cup (4) has a second part of a coupling device (5) for detachable connection with a rotor shaft (2) of the open-end spinning rotor (1), wherein the coupling device (5) includes a magnetic device (6) for axial connection of rotor shaft (2) and rotor cup (4) as well as a positive-locking connection for torque transmission between the rotor shaft (2) and the rotor cup (4), and wherein the rotor cup (4) comprises a second coupling profile (9) for positive-locking connection with a first coupling profile (8) of the rotor shaft (2), characterized by the fact that the second coupling profile (9) is designed as a multi-round profile, in particular as a six-round profile.

13. Rotor cup (4) according to the preceding claim, characterized by the fact that the second coupling profile (9) is designed as an internal multi-round profile, in particular as an internal six-round profile.

14. Rotor cup (4) according to one of the preceding claims, characterized by the fact that the rotor cup (4) has a receptacle (10) for the magnet device (6), in particular the permanent magnet, wherein preferably the receptacle (10) is arranged offset in the axial direction of the rotor cup (4) behind the second coupling profile (9) in the direction of a rotor base (11).

15. Rotor cup (4) according to one of the preceding claims, characterized by the fact that the second coupling profile (9) is arranged on a projection (13) of the rotor cup (4) or on a second insert (14), in particular an insert bushing, inserted into the rotor cup (4), wherein preferably the projection (13) or the second insert (14) has a centering section (16).

Images