DE102019113813A1 - Storage device for an open-end spinning rotor - Google Patents

Abstract

The invention relates to a roller bearing arrangement (5) for an open-end rotor spinning device (1), with a spinning rotor which rotates during a spinning operation at high speed in a rotor housing (6) subjected to negative pressure, the roller bearing arrangement (5) via roller bearings (5) arranged at a distance 35), which are each covered on the outside by a gap sealing device (28). In order to enable simple, inexpensive and space-saving assembly of the gap sealing devices (28), the invention provides that the gap sealing devices (28) each have a sealing element (31) , which is axially fixed between a first (29) and a second (30) positioning means, but is mounted so as to be radially limited in movement.

Description

The invention relates to a roller bearing arrangement for an open-end rotor spinning device with a spinning rotor which, during spinning operation, rotates at high speed in a rotor housing subjected to negative pressure, the roller bearing arrangement having roller bearings which are arranged at a distance and which are each covered to the outside by a gap sealing device.

With regard to the mounting of the spinning rotors of open-end spinning devices, several, in some cases quite different, embodiments are known and are described in detail in numerous patents in the patent literature.

For example, both open-end rotor spinning devices are known in the art, in which the spinning rotor is supported in a contactless manner by means of a magnetic bearing device or a pneumatic bearing, and open-end rotor spinning devices are known in which the spinning rotor is mechanically supported in a bearing device.

With regard to mechanical spinning rotor bearing devices, so-called support disk bearings, for example, are widespread, in which the spinning rotor is supported with its rotor shaft in the bearing gussets of two rotatably supported pairs of supporting disks, which in turn are rotatably supported. The rotor shaft is driven by a machine-length, revolving tangential belt that acts on the rotor shaft between the bearing gussets. Such support disk bearings enable relatively high rotor speeds and have proven to be excellent in practice in high-performance spinning machines. However, such support disk bearings are somewhat complex and correspondingly costly in terms of their construction.

Furthermore, in connection with open-end rotor spinning machines, the spinning rotors of which rotate at significantly lower speeds, open-end rotor spinning devices are also known in which the rotor shafts of the spinning rotors are mounted directly in roller bearing arrangements.

Such as in the DE 38 09 976 A1 , the DE 38 19 607 A1 or the DE 10 2004 019 530 A1 Rolling bearing arrangements described generally have a bush-like, steel bearing housing into which two outer raceways for associated rolling bearing bodies are incorporated at a distance. In the case of such roller bearing arrangements, the bearing housing is also hardened at least in the area of the outer raceways.

The associated roller bearing bodies, for example hardened steel balls, are also supported in the assembled state in opposite inner raceways of a steel shaft that forms a rotor shaft. The roller bearing bodies are rotatably supported in so-called cages and greased with a lubricant.

The rotor shaft is also hardened, at least in the area of the inner raceways, and is also equipped at the end with a so-called drive whorl, which is acted upon by a machine-length drive belt.

On the side of the rotor shaft opposite the drive whorl, a rotor cup is fixed which, during the spinning operation, revolves in a rotor housing that can be closed during the spinning process by means of a pivotably mounted cover element. The rotor housing is connected to a vacuum source which generates and maintains the spinning vacuum required in the rotor housing during spinning operation.

Rolling bearing arrangements of this type generally also have what are known as gap sealing devices which ensure that the lubricant is held in the area of the rolling ball bodies and also prevent dirt from entering the rolling bearing arrangement.

The known gap sealing devices, however, have various disadvantages. For example, they have a very complex construction and are therefore costly, and their space requirements are often considerable and their service life is relatively limited.

Based on the aforementioned prior art, the invention is based on the object of improving the known roller bearing arrangements for open-end rotor spinning devices, that is, to modify the gap sealing devices of such roller bearing arrangements so that they are characterized by reliable sealing and a long service life. In addition, the new gap sealing devices should be inexpensive and advantageous in terms of their space requirements.

The object is achieved according to the invention in that the gap sealing devices each have a sealing element which is axially fixed between a first and a second positioning means, but is supported so that it can move radially to a limited extent.

Such a design according to the invention has the particular advantage that the sealing element always adjusts itself radially during operation, with the result that although the sealing gap is always very narrow, the wear on the sealing element is relatively low and thus the Lifetime of such gap sealing devices is high. That is, gap sealing devices designed according to the invention not only reliably prevent lubricating grease from escaping from the roller bearing arrangements over a long period of operation, but also ensure that no dirt particles can penetrate into the roller bearing arrangements.

The gap sealing devices according to the invention are also very compact in their structural design and accordingly only require a relatively small installation space. In addition, such gap sealing devices are inexpensive to manufacture.

In an advantageous embodiment, it is provided that the sealing element is equipped with sealing lips which correspond to the rotating rotor shaft of the spinning rotor and are preferably made of an elastic material.

Such an elastic sealing element, which has sealing lips, can be implemented relatively easily and inexpensively and represents a reliable, uncomplicated component through which the operation of the gap sealing devices of roller bearing arrangements can be optimized.

As already indicated above, a reliable and low-wear sealing of the roller bearings of a roller bearing arrangement for a spinning rotor can be achieved by such an elastic sealing element equipped with sealing lips.

In an advantageous embodiment, it is further provided that the positioning means are designed as plastic disks which, in the assembled state, are each positioned in an associated bearing point of the bearing housing of the roller bearing arrangement.

The bearing point for the first positioning means is formed by a circumferential recess in the bearing housing, while a clip connection is arranged in front of the bearing point for the second positioning means.

When assembling a gap sealing device, the first positioning means, which can be moved axially without any problems, is first inserted into the circumferential recess and then the sealing element is installed. The second positioning means is then pushed over the clip connection which is incorporated into the bearing housing at a distance from the bearing point for the first positioning means.

The sealing element is axially fixed by the second positioning means, which is permanently fixed in its bearing point.

The sealing element remains radially movable, however, so that it is ensured that the sealing element corresponds to the rotating rotor shaft in accordance with the regulations at all times.

The invention is explained in more detail below using an exemplary embodiment shown in the drawings.

• 1 in perspektivischer Ansicht eine Offenend-Rotorspinnvorrichtung, deren Spinnrotor in einer Wälzlageranordnung rotierbar gelagert ist, welche ausgebildete Spaltdichtungseinrichtungen nach einem Ausführungsbeispiel aufweist,
• 2 in Seitenansicht sowie teilweise im Schnitt eine Wälzlageranordnung eines Spinnrotors, welche mit Spaltdichtungseinrichtungen nach einem Ausführungsbeispiel ausgestattet ist.

It shows:

• 1 a perspective view of an open-end rotor spinning device, the spinning rotor of which is rotatably mounted in a roller bearing arrangement, which has formed gap sealing devices according to an embodiment,
• 2 in side view and partially in section a roller bearing arrangement of a spinning rotor, which is equipped with gap sealing devices according to an embodiment.

The 1 shows a perspective view of an open-end rotor spinning device 1 an open-end rotor spinning machine.

As is known, such open-end rotor spinning machines generally have a large number of work stations, each with such an open-end rotor spinning device 1 are equipped.

Such open-end rotor spinning devices 1 are each above their storage facility 2 on a stationary, usually machine-length bearing axis 3 pivoted to a limited extent and each have a spinning rotor with its rotor shaft 4th in a roller bearing arrangement 5 is rotatably mounted, which via spaced apart roller bearings 35 has to the outside each through a gap sealing device 28 are covered.

During the spinning operation, the spinning rotors are driven by a rotating, machine-length tangential belt 7th , each from below on that of the rotor shaft 4th applied, driven.

In the exemplary embodiment shown, the spinning rotor is not shown in more detail for reasons of clarity.

As from the 1 can be seen, have such open-end rotor spinning devices 1 a vacuum pressurizable rotor housing 6th on, in which the spinning cup of the spinning rotor rotates at high speed during the spinning process, and through a cover element 8th or by one in the cover element 8th integrated sealant is closable.

The roller bearing arrangement 5 and the rotor housing 6th form a rotor shaft bearing element 9 that has a swivel axis 10 to the housing 11 a sliver opening device 12 connected.

As in 1 shown is the rotor shaft bearing element 9 with the open-end rotor spinning device closed 1 positioned so that the rotor shaft 4th in this operating position from below on the machine-long, circumferential tangential belt 7th is applied.

With the open-end rotor spinning device open (not shown) 1 is the rotor shaft bearing element 9 positioned in an inoperative position, that is, the rotor shaft 4th is at a distance from the further rotating tangential belt 7th positioned.

In this inoperative position there is also a braking element 13 on the rotor shaft 4th at. On the housing made, for example, of an aluminum alloy 11 the sliver opening device 12 is a housing made of plastic, for example, via screw bolts or the like 14th the storage facility 2 attached over which the open-end spinning device 1 limited mobility on the stationary bearing axis 3 connected. In the case 11 the sliver opening device 12 is also, as usual, a rotatable opening roller 17th stored, which is driven during the spinning operation by a further, also machine-long (not shown) tangential belt.

Furthermore is in the housing 11 a so-called sliver intake cylinder 18th rotatably mounted, the drive takes place for example via a (not shown) individual drive.

As indicated, are the axes of rotation 20th , 21st the opening roller 17th or of the sliver intake cylinder 18th arranged orthogonally to the axis of rotation of the spinning rotor during the spinning process.

On the housing 14th the storage facility 2 is also a bottom cover 15th set, in connection with a (not shown) top cover too fast and too strong contamination of the open-end rotor spinning device 1 prevented.

In 2 is a rolling bearing assembly on a larger scale 5 shown for a spinning rotor, the gap sealing devices designed according to the invention 28 having.

As can be seen, the roller bearing assembly has 5 Via a bush-like, usually steel, bearing housing 16 , in the spaced apart two outer raceways 22nd , 23 for roller bearing bodies 24 the spaced roller bearings 35 are incorporated, the bearing housing 16 at least in the area of the outer raceways 22nd , 23 is hardened.

The associated rolling bearing bodies 24 , for example hardened steel balls, are also supported in opposite inner raceways in the assembled state 25th , 26th a steel shaft from which the rotor shaft 4th a spinning rotor forms.

The rolling bearing bodies 24 are in turn in so-called cages 27 rotatably mounted and greased with a lubricant.

Also the rotor shaft 4th is at least in the area of the inner raceways 25th , 26th hardened and has, as in 1 shown, at the end of a so-called drive wharve, which is from a machine-length drive belt 7th is applied.

On the side of the rotor shaft opposite the drive whorl 4th is, as is known, the rotor cup of the spinning rotor fixed, which during the spinning operation in the rotor housing 6th which, as already mentioned above, during the spinning process by means of a pivotably mounted cover element 8th is locked. The rotor housing 6th is in connection with a source of negative pressure, which during the spinning operation in the rotor housing 6th necessary negative pressure generated.

Such rolling bearing arrangements 5 also have so-called gap seal arrangements 28 which ensure that the lubricant in the area of the rolling ball raceways 22nd , 23 , 25th , 26th and also prevent dirt from getting into the roller bearing assemblies 5 can penetrate.

The gap seal arrangements according to the invention 28 show how in 2 shown, each a first and a second positioning means 29 , 30th on, between each of which a sealing element 31 axially fixed but radially limited movable is supported.

The sealing element 31 has sealing lips 32 that came with the rotor shaft 4th correspond and is preferably made of an elastic material.

How out 2 further visible are the positioning means 29 , 30th , which are preferably designed as plastic disks, in the assembled state in bearings 33 , 34 of the bearing housing 16 the roller bearing arrangement 5 arranged.

The depository 33 for the first positioning means 29 is as a circumferential recess in the bearing housing 16 formed while the bearing point 34 of the second positioning means 30th behind a stop edge in the bearing housing 16 is arranged. That is, the first positioning element 29 is pushed axially into the circumferential recess and there forms a rear slide for the sealing element 31 .

That with pressure in the storage place 34 clipped in and then permanently fixed there second positioning means 30th forms for the sealing element 31 a front slideway.

List of reference symbols

1

Open-end rotor spinning device

2

Storage facility

3

Bearing axis

4th

Rotor shaft

5

Rolling bearing arrangement

6

Rotor housing

7th

Tangential belt

8th

Cover element

9

Rotor shaft element

10

Swivel axis

11

casing

12

Sliver opening device

13

Braking element

14th

casing

15th

cover

16

Bearing housing

17th

Opening roller

18th

Sliver intake cylinder

20th

Axis of rotation

21st

Axis of rotation

22nd

Outside career

23

Outside career

24

Rolling bearing body

25th

Inner track

26th

Inner track

27

Cage

28

Gap sealing device

29

first position means

30th

second position means

31

Sealing element

32

Sealing lips

33

Depository

34

Depository

35

roller bearing

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 3809976 A1 [0006]
• DE 3819607 A1 [0006]
• DE 102004019530 A1 [0006]

Claims (6)

Rolling bearing arrangement (5) for an open-end rotor spinning device (1), with a spinning rotor which, during spinning operation, rotates at high speed in a rotor housing (6) subjected to negative pressure, the rolling bearing arrangement (5) having rolling bearings (35) arranged at a distance, which are each covered on the outside by a gap sealing device (28), characterized in that the gap sealing devices (28) each have a sealing element (31) which is axially fixed between a first (29) and a second positioning means (30), but radially is mounted to a limited extent movable. Rolling bearing arrangement (5) according to Claim 1 , characterized in that the sealing element (31) is equipped with sealing lips (32) which are designed to correspond with a rotating rotor shaft (4) of the spinning rotor. Rolling bearing arrangement (5) according to Claim 1 or 2 , characterized in that the sealing element (31) is made of an elastic material. Rolling bearing arrangement (5) according to one of the preceding claims, characterized in that the positioning means (29, 30) are designed as plastic disks, which in the assembled state are each positioned in an associated bearing point (33, 34) of the bearing housing (16) of the rolling bearing arrangement (5) are. Rolling bearing arrangement (5) according to one of the preceding claims, characterized in that the bearing point (33) for the first positioning means (29) is formed by a circumferential recess in the bearing housing (16) into which the first positioning means (29) can be pushed axially. Rolling bearing arrangement (5) according to one of the preceding claims, characterized in that the bearing point (34) for the second positioning means (30) is designed as a clip connection, behind which the second positioning means (30) can be locked.

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