EP3153611B1 - Rotor cup for an open-end spinning rotor with a coupling device - Google Patents

Description

The present invention relates to a rotor cup for an open-end spinning rotor, in which a fiber material can be spun and which can be detachably connected to a rotor shaft of the spinning rotor via a coupling device. The coupling device contains a positive connection for torque transmission between the rotor cup and the rotor shaft and a magnetic device for the axial connection of the rotor shaft and rotor cup.

When producing yarns in open-end spinning machines, it is necessary, depending on the type of fiber material to be spun and the type of yarn to be produced, to use different spinning rotors or spinning rotors with different rotor cups, as the shape and design of the rotor cup Spinning rotor has a significant influence on the spinning result. The rotor cups of spinning rotors in open-end spinning machines are also subject to considerable wear due to the constant fiber contact and must therefore be replaced. Depending on the structure of the open-end spinning device and the mounting of the spinning rotor, exchanging the spinning rotors can be associated with considerable effort, so that spinning rotors are often provided with a coupling device in order to be able to exchange the rotor cup.

The DE 43 42 539 A1 describes a shaftless spinning rotor in which the rotor cup is connected directly to the drive of the spinning rotor by means of a coupling device. The rotor cup or the shaftless spinning rotor is comparatively easy to replace in this version of a spinning rotor. Such shaftless spinning rotors, however, have not been able to establish themselves in practice.

From the EP 2 463 415 A2 an open-end spinning rotor is known whose rotor shaft is driven by means of a tangential belt and is mounted directly in ball bearings. In order to enable the replacement of the rotor cup, the rotor shaft and the rotor cup are connected to one another by means of a transition fit. If there is play, the fit is secured by an additional screw; in the case of a press fit, it remains when the two parts are shrunk onto one another. Replacing the rotor cup is possible with this version, but it is still time-consuming.

In particular in open-end spinning devices in which the rotor shaft is mounted in a magnetic bearing, the installation or removal of the complete spinning rotor is complex, so that spinning rotors with a coupling device are generally used there.

The DE 38 15 182 A1 describes a spinning rotor with such a clutch arrangement. The DE 38 15 182 A1 provides for a coupling shell with a recess or sleeve to be arranged at the end of the rotor shaft, in which a correspondingly complementary pin, which is arranged on the bottom of the rotor pot at the rear, engages. The torque transmission from the rotor shaft to the rotor pot should take place by means of a positive connection between the two coupling parts. According to a second embodiment, instead of a large, central pin, several smaller pins can also be provided which engage in recesses in the coupling shell. A permanent magnet, which is inserted into the clutch disc on the rotor shaft, is used to hold the rotor pot in place. The clutch arrangement is comparatively complex to manufacture and also comparatively large and heavy, which is disadvantageous at today's high speeds.

The EP 1 156 142 B1 shows a spinning rotor which is already provided for an open-end spinning device with a magnetic bearing arrangement. The The coupling device contains a receiving sleeve which is arranged on the shaft of the spinning rotor and in which a hexagon socket is arranged. On the rotor cup, a cylindrical guide extension is formed as a coupling device, which engages in the receiving sleeve of the rotor shaft. In the extension of the cylindrical guide attachment there is an external hexagon which engages in the internal hexagon in the sleeve of the rotor shaft. Behind the receiving sleeve of the rotor shaft, which contains the hexagon socket, a permanent magnet is also arranged inside the rotor shaft, which is intended to take over the axial securing of the coupling device. The manufacture of the spinning rotor with the additional guide attachment and the additional receiving sleeve is also comparatively complex.

The object of the present invention is to propose a rotor cup for an open-end spinning rotor with a coupling device which has a simple and maintenance-friendly structure.

The object is achieved with the features of claim 1.

In the case of an open-end spinning rotor with a rotor cup, a rotor shaft and a coupling device by means of which the rotor shaft and the rotor cup are detachably connected to one another, the coupling device contains a form-fitting connection for torque transmission and a magnetic device for the axial connection of rotor shaft and rotor cup. Provision is now made for the coupling device with its two coupling components to be arranged directly on the rotor shaft or the rotor cup without the interposition of further components. The assembly of the open-end spinning rotor is particularly simple as a result, since only the two parts of the rotor shaft and rotor cup have to be connected to one another and the permanent magnet may still have to be used. In addition, this makes it possible to provide a coupling device with only a very low weight, which does not require any additional space. The open-end spinning rotor can therefore also be used particularly advantageously in open-end spinning devices with high speeds of over 130,000.

As a coupling device, the rotor shaft has at least one projection with at least one torque-transmitting area which engages in at least one corresponding recess in the rotor cup with at least one torque-transmitting counter area. A receptacle for a permanent magnet is arranged on the rotor cup, in particular in the rotor base of the rotor cup. Because the permanent magnet is arranged on the rotor cup, it is possible in a particularly simple and inexpensive manner to remove it after its service life has expired and to replace it with a new permanent magnet. A complex dismantling of the rotor shaft from the bearing of the open-end spinning device is not necessary for this.

If the receptacle for the permanent magnet is located directly in the bottom of the rotor cup, the permanent magnet is particularly easily accessible and easy to replace. It is also particularly advantageous in this arrangement that the permanent magnet is located on the wear part of the spinning rotor, namely the rotor cup, which has to be replaced after a certain time anyway. It has been shown that magnets of this type often have a comparatively short service life and therefore have to be replaced. This is now possible without any problems due to the arrangement of the permanent magnet on or in the easily exchangeable rotor cup, since the magnet is easily accessible.

A particularly good accessibility and thus a particularly simple exchangeability of the permanent magnet results when it is arranged in an axial extension of the recess for the projection of the rotor shaft. At the same time, this also results in a particularly good axial connection between the rotor shaft and the rotor cup.

Simple production and simple assembly of the open-end spinning rotor is made possible by the fact that the receptacle for the permanent magnet is formed by a bore in the rotor cup. Such a bore is preferably located in the bottom of the rotor cup, so that the permanent magnet can simply be introduced into the receptacle from the opening of the rotor cup. However, it is also possible to arrange one or more permanent magnets within the collar of the rotor cup in such a way that, when the spinning rotor is mounted, these are next to the projection of the rotor shaft. For example, an annular permanent magnet can also be arranged in the collar of the rotor cup, which magnet surrounds the projection of the rotor shaft when the spinning rotor is mounted.

According to an advantageous embodiment, the at least one projection of the rotor shaft has a cylindrical outer contour, at least at its end facing the rotor cup. In this way, good centering of the rotor cup relative to the rotor shaft can be achieved and imbalances can be avoided.

According to another embodiment, the at least one projection of the rotor shaft has an elliptical outer contour, at least in sections. The projection of the rotor shaft can accordingly either have an elliptical outer contour over its entire length or only have a section with an elliptical outer contour. In this case, the elliptical outer contour forms the at least one torque-transmitting area.

According to an advantageous development, the at least one projection of the rotor shaft includes a first section facing the rotor cup and a second section facing its shaft end facing away from the rotor cup. The section facing the shaft end contains the at least one torque-transmitting area, which is designed, for example, as a torque-transmitting surface or edge can be. By dividing the projection into two or more sections, it is possible to assign a separate task to each of these sections, for example to provide one or more torque-transmitting areas on one section and to center the rotor shaft to the rotor cup via a further section. Likewise, one of the sections can serve to connect the rotor cup to the rotor shaft.

It is also advantageous if the at least one projection or a section of the at least one projection of the rotor shaft has at least one groove which contains the at least one torque-transmitting area. This can be produced by milling in a manner that is advantageous in terms of production technology.

It is particularly advantageous if the second section contains a wrench size or an elliptical outer contour. This then in turn forms the torque-transmitting area, here in the form of a torque-transmitting surface. If the second section contains a wrench size, both the wrench size on the second section of the projection and the corresponding mating area or the mating surface on the rotor cup can be produced in a particularly simple manner. However, it is also possible to provide only a single torque-transmitting area on the second section.

It is also advantageous if the first section has a cylindrical outer contour. Centering can be carried out in a simple manner by means of the cylindrical outer contour. In addition, the rotor shaft can also be fastened in the rotor cup by means of a press fit, for example.

It is also advantageous for the manufacture and assembly of the spinning rotor if the at least one recess in the rotor cup has a through hole, in particular includes a cylindrical through hole. It is particularly advantageous if the receptacle for the permanent magnet is also arranged in the cylindrical through hole or is formed directly through the cylindrical through hole. At the same time, a particularly good axial hold can be achieved as a result, since the projection of the rotor shaft and the permanent magnet can contact each other directly when the spinning rotor is mounted. Depending on the design of the projection on the rotor shaft, however, the through-hole can also be designed elliptically or ovally. In this case, in turn, the inner, elliptical or oval lateral surface of the through hole forms the at least one torque-transmitting counter-surface or the at least one torque-transmitting counter-area.

According to the invention, the at least one recess of the rotor cup contains a first, cylindrical section in which the first section of the projection of the rotor shaft engages, and a second section which contains the at least one torque-transmitting counter-region and cooperates with the first section of the projection of the rotor shaft. It is particularly advantageous in this embodiment that, as already described, different functions can also be assigned to the different sections. The torque-transmitting surfaces or areas, which always deviate from the cylindrical shape, can be made so large that good torque transmission is made possible, but on the other hand are made so short in relation to the longitudinal axis of the spinning rotor that no significant imbalances are generated in the spinning rotor will. Such a design is of course not only possible with two sections of the projection of the rotor shaft or with two sections of the recess of the rotor cup. Three or more sections can also be provided. In this case, the at least one torque-transmitting area or counter-area does not necessarily have to be arranged on the first section facing away from the rotor cup.

It is particularly advantageous if the second section of the recess is arranged on the rear of the rotor cup on the collar of the rotor cup.

Furthermore, it is advantageous if the second section of the recess contains at least one groove which preferably extends over the entire width of the collar of the rotor cup. The manufacture of the rotor cup or the spinning rotor is thereby possible in a particularly simple manner by milling the groove or grooves.

Furthermore, it is advantageous if the permanent magnet can be clipped into the receptacle, in particular into the through hole, of the rotor cup. The simple exchange as well as the simple assembly are thereby further supported.

In addition, it is advantageous if the permanent magnet has a plastic coating. As a result, the permanent magnet can be fixed in the receptacle in a particularly simple manner by means of the plastic coating. Because of the elasticity of the plastic coating, not only can the permanent magnet be clamped in its receptacle, but also a partially form-fitting hold can be achieved.

In addition, it is advantageous if the rotor shaft and / or the rotor cup has a stop surface for the axial positioning of the rotor shaft in relation to the rotor cup. This further simplifies the assembly of the spinning rotor.

It is also advantageous if the shaft end arranged on the projection of the rotor shaft forms a support surface for the permanent magnet. After the spinning rotor has been installed, only the permanent magnet then needs to be inserted into the through-hole from the side of the rotor base the rotor cup and is automatically correctly positioned after the stop on the support surface of the projection.

The rotor shaft is advantageously made of a ferromagnetic material at least in the region of its projection.

Figur 1

einen Spinnrotor mit einer Kupplungsvorrichtung zwischen Rotorschaft und Rotortasse in einer schematischen Schnittdarstellung,

Figur 2

einen Vorsprung am Schaftende eines Rotorschafts nach einer ersten Ausführung,

Figuren 3 und 4

eine Rotortasse mit einer Ausnehmung für einen Vorsprung des Rotorschafts,

Figur 5

eine weitere Ausführung eines Vorsprungs an einem Rotorschaft,

Figur 6

eine weitere alternative Ausführung eines Vorsprungs an einem Rotorschaft,

Figur 7

eine Detaildarstellung einer Kupplungsvorrichtung in einem schematischen Schnitt,

Figur 8

eine weitere Ausführung einer Rotortasse mit einer Ausnehmung für einen Vorsprung des Rotorschafts und einem Ringmagneten,

Figur 9

eine weitere alternative Ausführung einer Rotortasse mit einer Ausnehmung für einen polygonalen Vorsprung des Rotorschafts, sowie

Figur 10

eine Darstellung einer weiteren Kupplungsvorrichtung in einer perspektivischen Ansicht.

Further advantages of the invention are described on the basis of the exemplary embodiments shown below. Show it:

Figure 1

a spinning rotor with a coupling device between rotor shaft and rotor cup in a schematic sectional view,

Figure 2

a projection on the shaft end of a rotor shaft according to a first embodiment,

Figures 3 and 4

a rotor cup with a recess for a protrusion of the rotor shaft,

Figure 5

another embodiment of a projection on a rotor shaft,

Figure 6

another alternative embodiment of a projection on a rotor shaft,

Figure 7

a detailed representation of a coupling device in a schematic section,

Figure 8

another version of a rotor cup with a recess for a projection of the rotor shaft and a ring magnet,

Figure 9

Another alternative embodiment of a rotor cup with a recess for a polygonal projection of the rotor shaft, as well

Figure 10

a representation of a further coupling device in a perspective view.

Figure 1 shows an open-end spinning rotor 1 in a bearing 5 in a schematic, sectioned overview illustration. According to the present illustration, the spinning rotor 1 is supported in a magnetic bearing arrangement as a bearing 5 at two bearing points. The open-end spinning rotor 1 is rotatably mounted in the bearing 5 and is driven by an electric motor, not shown. However, it is also possible to arrange an open-end spinning rotor 1 in a conventional bearing 5 with support disks. Also not shown is an axial bearing of the open-end spinning rotor 1, which, for example, can also be designed as a magnetic bearing.

The open-end spinning rotor 1 contains a rotor cup 2 and a rotor shaft 4, which by a coupling device 6, which contains a positive connection (not visible in the present illustration) for torque transmission between the rotor cup 2 and the rotor shaft 4, as well as a permanent magnet 7 for axial Connection of rotor shaft 4 and rotor cup 2. The form-fitting connection for torque transmission is formed directly on rotor shaft 4 or rotor cup 2, so that these are connected directly to one another in a particularly advantageous manner without additional components. The rotor shaft 4 includes a projection 8 with at least one torque-transmitting area 9 (see for example Figure 2 ). Likewise, on the rotor cup 2 there is a recess 10 corresponding to the projection 8 in the rotor cup 2 with at least one torque-transmitting mating area 11 (see Figures 3 and 4th ) arranged. The projection 8 engages in the corresponding Recess 10 of the rotor cup 2 and thereby forms the positive connection for torque transmission.

According to the present illustration, the rotor cup 2 is provided with a through hole 14, which at the same time forms the recess 10 for the projection 8 and a receptacle 12 for the permanent magnet 7. This design can be produced in a particularly simple manner and also enables simple assembly and simple installation and removal of the permanent magnet 7. It is also particularly advantageous that the coupling device 6 is less susceptible to soiling such as fiber buildup or this is due to the through hole 14 can be easily removed again through the through hole 14.

The through bore 14 can be designed as a cylindrical bore so that it can also serve to center the rotor cup 2 on the rotor shaft 4. The projection 8 of the rotor shaft 4 is therefore also predominantly cylindrical. The cylindrical projection 8 extends into the center of gravity of the rotor cup 2, whereby a particularly good centering can take place.

Again Figure 1 can be removed, the recess 10 of the rotor cup 2 has a first section 10a, which is cylindrical in the present case, and a second section 10b, which contains the at least one torque-transmitting counter-region 11. The rotor shaft 4 according to the present illustration also has a first section 8a, which is cylindrical, and a second section 8b, which faces the end of the shaft facing away from the rotor cup, and which has one or more torque-transmitting areas 9, which are designed as surfaces or edges can includes.

While it is advantageous for the first section 10a of the recess 10 and for the first section 8a of the projection 8 to be cylindrical, For example, the second section 8b of the projection 8 or the second section 10b of the recess 10 can have different contours in order to provide one or more torque-transmitting surfaces or areas 9. It is advantageous if the second section 10b and the second section 8b are designed as short as possible in relation to the longitudinal axis of the spinning rotor, in order to avoid imbalances during operation.

Figure 2 shows a first embodiment of a projection 8 on a rotor shaft 4 with a first section 8a and a second section 8b. The first section 8a is cylindrical, as described above, while the second section 8b contains a width across flats 13. The second section 8b provides two opposing torque-transmitting areas 9.

Figure 3 shows a rotor cup 2, which with the rotor shaft 4 of Figure 2 can be mounted to an open-end spinning rotor 1, and which has a recess 10 with a first section 10a and a second section 10b. The first section 10a is designed as a cylindrical bore corresponding to the projection 8a. How to Figure 1 described, the cylindrical bore can be designed as a through bore 14 and contain the receptacle 12 for the permanent magnet. Likewise, however, the first section 10a can also be designed as a blind hole. The second section 10b is in the present case designed as a groove 20 and provides two torque-transmitting surfaces or opposing areas 11, which with the width across flats 13 of the projection 8 of Figure 2 can work together. The groove-shaped, second section 10b is arranged on the rear of the opening of the rotor cup 2 on the collar 3 of the rotor cup 2, which is advantageous in terms of production technology.

Figure 4 shows an alternative embodiment of a rotor cup 2, which like that in Figure 3 The recess 10 shown has a first section 10a and a second section 10b. In contrast to the representation of the figure 3 the second section 10b is designed as a groove 20 which extends over the entire width of the collar 3 of the rotor cup 2 and which also contains two torque-transmitting counter-regions 11. Such a recess 10 can be produced in a particularly simple manner.

Figure 5 shows another embodiment of a rotor shaft 4 with a projection subdivided into a first section 8a and a second section 8b. The first section 8a is again cylindrical, while the second section 8b has an elliptical outer contour, the circumferential surface of which forms the at least one torque-transmitting region 9. The rotor cup 2 (not shown here) contains in this case similar to that in Figure 3 illustrated a recess 10 with a first portion 10a, which is cylindrical and a second portion 10b, which is similar to the illustration of Figure 3 is elliptical.

It is obvious that numerous modifications are possible with regard to the design of the second section 8b of the projection 8 or the second section 10b of the recess 10. Thus, the second section 8b of the projection 8 can also be a square or an oval (similar to that in FIG Figure 3 shown) or a polygon. Furthermore, it is, for example, a modification of the Figure 2 also possible, instead of a width across flats 13, to flatten only one side of the second section 8b of the projection 8, so that only one torque-transmitting area 9 is also available.

Figure 6 shows a further embodiment in which a projection 8 on a rotor shaft 4, however, only has a single section. The projection 8 is formed elliptically according to the present illustration and engages in an elliptical bore, not shown, of a rotor cup 2, which can be produced, for example, by milling. It is therefore also with the lead Figure 6 only a single torque-transmitting area 9 is provided. The projection 8 of the rotor shaft 4 can of course also have an oval shape, deviating from the illustration shown.

Figure 7 shows a rotor cup 2 with part of the rotor shaft 4 in a detailed representation. Again Figure 7 Removable, the rotor cup 2 like the rotor shaft 4 each have an axial stop surface 16 so that when the open-end spinning rotor is installed, after reaching the stop surfaces 16, the rotor cup 2 is automatically correctly positioned in the axial direction with respect to the rotor shaft 4. Even after the representation of the Figure 7 the permanent magnet is arranged in a receptacle 12 which is formed by a through hole 14 of the rotor cup 2. The end of the rotor shaft 4 facing the rotor cup 2 forms a positioning surface 17 for the permanent magnet 7, so that once the open-end spinning rotor 1 has been installed, it also only has to be pressed or clipped into the through-hole 14 or its receptacle 12 and into is automatically positioned in the axial direction.

The receptacle 12 for the permanent magnet includes a circumferential groove 18 according to the present illustration. If the permanent magnet 7 contains a plastic coating 15, the permanent magnet 7 can be sufficiently held by simply pressing in the receptacle 12 by deforming the elastic plastic coating 15. Deformation of the plastic coating 15 results in a partially also form-fitting hold.

Instead of the plastic coating 15, the permanent magnet 7 can, however, also be provided with a special holder (not shown), for example a metallic holder, by means of which it can be clipped into the receptacle 12.

According to another embodiment of the invention, as shown in the Figures 8 and 9 is shown, a ring magnet is in the collar 3 of the rotor cup 2 as a permanent magnet 7 arranged. For this purpose, the rotor cup 2 is provided with a through-bore 14 designed as a stepped bore, the larger diameter of the stepped bore forming the receptacle 12 for the ring-shaped permanent magnet 7 according to the present illustrations. Preferably, as in Figures 8 and 9 shown, the ring magnet inserted into the rotor cup 2 from the side of the collar 3. The permanent magnet 7 can be made somewhat larger in this embodiment than in the arrangement of the Figure 7 so that there is a particularly good axial hold. The ring magnet preferably at the same time at least partially forms the first section 10a of the recess 10 in the rotor cup, in which the projection 8 or the second section 8b of the projection 8 of the rotor shaft 4 can be fixed. The ring magnet is then arranged directly behind the second section 10b of the recess 10 which forms the torque-transmitting counter-regions 11.

To Figure 8 The second section 10b of the recess 10 of the rotor cup 2 includes a groove 20 as in FIG Figure 3 shown, but the torque-transmitting counter-regions 11 are interrupted by the receptacle 12 for the permanent magnet 7, so that in the present case four torque-transmitting counter-regions 11 are formed. The projection 8 of the rotor shaft 4 corresponds to that in FIG Figure 2 shown.

In Figure 9 a ring magnet is also shown as a permanent magnet 7, the second section 10b of the recess 10 of the rotor cup 2 is, however, in the form of a rounded polygon, here a rounded triangle. It is advantageous in this embodiment that several, here three, positions for mounting the rotor shaft 4 in the rotor cup 2 are available. The production of such a rounded polygon is also easily possible for both the recess 10 and the preamble 8 by milling. Deviating from the representation shown, it would therefore also be possible to use the entire recess 10 or the entire projection 8 in such a polygonal manner, similar to that in Figure 6 execution shown. The permanent magnet 7 would then in turn be arranged in an axial extension of the projection 8.

Advantageous in both embodiments of the Figures 8 and 9 With a through hole 14, it is in turn that the hole on the rotor cup 2 is open towards the rotor base 19 and therefore any impurities do not stick to the coupling device 5 between the projection 8 of the rotor shaft and the ring magnet, but can be removed through the through hole 14 . Furthermore, the rotor cup 2 can be made shorter than in an embodiment in which the permanent magnet 7 is arranged in an axial extension of the projection 8.

Another embodiment of a coupling device 6 is shown in FIG Fig. 10 shown. The rotor cup 2, like that of the Figure 1 be provided with a through hole 14 which the receptacle 12 (not visible) for the permanent magnet 7 (also not visible) can form. Here, too, the through-hole 14 also serves to center the rotor cup 2 with respect to the rotor shaft 4 by means of the projection 8 or the first section 8a of the projection 8. Just as, for example, the rotor cups of Figures 1 and 3 As a result, the recess 10 of the rotor cup 2 also has a first section 10a, which in the present case is cylindrical through the through hole 14, and a second section 10b, which contains the at least one torque-transmitting counter-area 11. Of course, in this embodiment too, the first section 10a could be designed as a blind hole instead of the through hole 14 in order to accommodate the permanent magnet 7 and to center the rotor shaft 4.

The second section 10b of the recess 10 of the rotor cup in the present case contains several grooves 20, which in the present case are each arranged at a 30 ° angle to one another and which each have at least one torque-transmitting region 9. These grooves 20 can be in a simple Way can be introduced radially by means of a milling cutter. In a similar way, the second section 8b of the projection 8 of the rotor shaft 4 contains several grooves 20, which in the present case are also arranged at a 30 ° angle to one another and which each contain at least one torque-transmitting region 9. The grooves 20 each extend over the entire width of the collar 3 of the rotor cup 2, so that production is further simplified.

It is advantageous in such an embodiment with several grooves 20 that when the rotor cup 2 is mounted on the rotor shaft 4, the rotor cup only needs to be rotated slightly until the projection 8 or the several remaining between the grooves 20 forming the projection 8 Elevations engage in the grooves 20 of the recess 10 of the rotor cup 2. However, it is also possible in this embodiment to provide only one or two grooves 20 on the rotor cup 2 and then to produce corresponding webs as projections or projections 8 on the rotor shaft by milling. Furthermore, it is also possible to provide more than three grooves 20.

The torque-transferring areas 9 of the projection 8 and the torque-transferring counter areas 11 of the recess 10 can be formed by the side surfaces of the grooves 20 or simply by closing edges of the grooves 20, depending on the design of the grooves 20.

Furthermore, in this embodiment, too, an axial stop surface 16 and a positioning surface 17 for the permanent magnet 7 such as to Fig. 7 described, so that reference is made to the statements there.

The invention is not restricted to the representations shown in the exemplary embodiments. In particular, instead of a projection and a recess, as mainly shown in the exemplary embodiments, several projections can also be arranged on the rotor shaft, which correspondingly interact with several recesses on the rotor cup. Further modifications and combinations within the scope of the patent claims, as far as technically possible and sensible, also fall under the invention.

List of reference symbols

1

Open-end spinning rotor

2

Rotor cup

3

Bundle of rotor cup

4th

Rotor shaft

5

storage

6th

Coupling device

7th

Permanent magnet

8th

Projection 8a first section 8b second section

9

torque-transmitting area

10

Recess 10a first section 10b second section

11

torque-transmitting counter area

12

Holder for permanent magnets

13

Key-width

14th

Through hole

15th

Plastic coating

16

Stop surface

17th

Positioning surface

18th

Circumferential groove

19th

Rotor bottom

20th

Groove

Claims (10)

1. Rotor cup (2) for an open-end spinning rotor (1), in which a fiber material is able to be spun, and which has a coupling device (6) for detachable connection to a rotor shaft (4) of the spinning rotor (1), wherein the coupling device (6) includes a positive-locking connection for the transmission of the turning moment between the rotor cup (2) and the rotor shaft (4) along with a magnetic device for the axial connection of the rotor shaft (4) and the rotor cup (2), characterized in that the rotor cup (2) has as coupling device (6) at least one recess (10) for a projection (8) of the rotor shaft (4), wherein the recess (10) includes a first, cylindrical section (10a) and a second section (10b) having at least one torque-transmitting mating portion (11) in the form of at least one torque-transmitting surface, wherein the coupling device (6) is arranged directly on the rotor cup (2) without interposition of further components and that, a socket (12) for a permanent magnet (7) is arranged on the rotor cup (2), in particular in the bottom (19) of the rotor cup (2), wherein the socket (12) for the permanent magnet (7) is formed by a bore hole.
2. Rotor cup (2) according to the preceding claim, characterized in that the socket (12) for the permanent magnet (7) is arranged in an axial extension of the at least one recess (10).
3. Rotor cup (2) according to one of the preceding claims, characterized a permanent magnet (7) is arranged in the socket (12), preferably replaceably.
4. Rotor cup (2) according to claim 3, characterized in that the permanent magnet (7) is formed as a ring magnet.
5. Rotor cup (2) according to one of the preceding claims, characterized in that the at least one recess (10) of the rotor cup (2) includes a through hole (14), in particular a cylindrical through hole (14), and that, preferably, the socket (12) for the permanent magnet (7) is formed by the cylindrical through hole (14).
6. Rotor cup (2) according to one of the preceding claims, characterized in that the second section (10b) of the recess (10) is arranged on a truss (3) of the rotor cup (2).
7. Rotor cup (2) according to one of the preceding claims, characterized in that the recess (10) or the second section (10b) of the recess (10) includes at least one groove (20), which preferably extends across the entire width of the truss (3).
8. Rotor cup (2) according to one of the preceding claims with reference to claim 3 or 4, characterized in that the permanent magnet (7) can be clipped into the socket (12), in particular into the through hole (14).
9. Rotor cup (2) according to one of the preceding claims with reference to claim 3, 4 or 8, characterized in that the permanent magnet (7) features a plastic lining cover (15) and is preferably able to be fixed by means of the plastic lining cover (15) in the socket (12).
10. Rotor cup (2) according to one of the preceding claims, characterized in that the rotor cup (2) features a stop surface (16) for the axial positioning of the rotor shaft (4) in relation to the rotor cup (2).

Images