DE102019113812A1 - Rolling bearing arrangement for an open-end rotor spinning device - Google Patents

Abstract

The invention relates to a roller bearing arrangement (5) for an open-end rotor spinning device (1) with two spaced apart roller bearings (14) for the rotatable mounting of a rotor shaft (4) of a spinning rotor rotating at high speed during spinning operation and one on a bearing housing (16) of the Rolling bearing arrangement (5) positioned damping device (2), by means of which the bearing housing (16) of the rolling bearing arrangement (5) can be supported in a housing (9) of the open-end rotor spinning device (1) with limited movement. To the damping device (2) of such rolling bearing arrangements (5 ) To simplify the manufacturing process and thus make it more cost-effective, the invention provides that the damping device (2) has two damping means (15) which are spaced apart in the assembled state on the bearing housing (16) of the roller bearing arrangement (5) and each consist of one inner, sleeve-like, stable bearing ring (22) and one fixed on the bearing ring (22) inextricably linked elastic buffer element (23) exist, which can be fixed with pretension in the housing (9).

Description

The invention relates to a roller bearing arrangement for an open-end rotor spinning device with two spaced apart roller bearings for the rotatable mounting of a rotor shaft of a spinning rotor rotating at high speed during spinning operation and a damping device positioned on the bearing housing of the roller bearing arrangement, via which the bearing housing of the roller bearing arrangement can be moved to a limited extent in a housing the open-end rotor spinning device can be supported.

Open-end rotor spinning devices that work at speeds of 100,000 min ^-1 and are directly supported by roller bearing arrangements are usually equipped with so-called damping devices.

Such damping devices, which have long been known in different embodiments, have the function of largely reducing the high dynamic forces occurring during the spinning operation.

In an older embodiment, damping devices of this type often have a special, inner bearing sleeve which is connected to the bearing housing of the roller bearing arrangement via a positioning and locking device. The bearing sleeve is equipped with damping elements that are each formed by a rubber-elastic component that is fixed between two stable bearing rings. In order to prevent additional natural resonance from occurring, the inner bearing rings of the damping elements are fixedly arranged on the bearing sleeve of the damping device, while the outer bearing rings of the damping elements can often be slidably positioned in the housing of the open-end rotor spinning devices.
This means that the roller bearing arrangements and thus the spinning rotors are each axially displaceable with respect to the housing of the relevant open-end rotor spinning device and can be precisely adjusted by means of the positioning and locking device so that the spinning rotors with respect to other elements of the open-end rotor spinning device, such as the fiber guide channel and the Thread take-off device, are always properly adjustable.

The axial positioning of the spinning rotors is often done by moving the roller bearing arrangement together with the annular damping elements of the damping device in the housing of the open-end rotor spinning device.

However, since the outer bearing rings of the damping elements often get stuck in the housing of the open-end rotor spinning device after prolonged spinning operation due to dirt, dust and / or vibration corrosion and can then no longer be sensitively moved axially in order to adjust the rotor bearing, the exact setting is often required in practice dispensed with the position of the spinning rotor.

Rolling bearing arrangements of this type for the spinning rotors of open-end rotor spinning devices, the damping devices of which each have a bearing sleeve mounted displaceably with respect to the bearing housing of a rolling bearing arrangement, on which damping elements are arranged at the end, which consist of an inner and an outer bearing ring, a rubber element being vulcanized between the bearing rings are for example in the DE 33 14 547 A1 or in the DE 38 37 733 A1 described.

In these roller bearing arrangements, the bearing sleeve for the damping elements has a continuous threaded bore into which a screw is inserted which has an adjusting tip at the end. In addition, the bearing housing of the roller bearing arrangements is equipped with a groove in which a ring is inserted, which usually consists of plastic or a similarly deformable material.

To connect the bearing housing of the roller bearing arrangement to the bearing sleeve of the damping device, the tip of the screw has to be screwed into the plastic ring and then fixes the roller bearing arrangement with respect to the damping device fixed in the housing of the open-end rotor spinning device.

Rolling bearing arrangements designed in this way, however, have various disadvantages. In such devices, the bearing housing of the roller bearing arrangement has to be axially readjusted with respect to the bearing sleeve of the damping device, for example, after each maintenance, whereby it must be ensured that the screw tip always penetrates the plastic ring at a new point.

Another disadvantage of roller bearing arrangements which are equipped with damping devices of this type is that the necessary clamping force is only transmitted via the relatively small area of the screw tip. That is, due to the creep behavior of the plastic, the clamping force of the screw tip often decreases over time, with the result that the fastening security of the roller bearing arrangement decreases or is no longer given.

Through the DE 10 2004 007 758 A1 a comparable roller bearing arrangement, also equipped with a damping device, is known. Also in this roller bearing arrangement, the The further developed damping device has a special bearing sleeve which is equipped at the end with damping elements, each of which consists of an inner and an outer bearing ring, between which a rubber element is vulcanized.
The bearing sleeve has a through hole. In the area of the through hole, a so-called pressure distribution element is also positioned, which has an opening. The through-hole in the bearing sleeve and the opening in the pressure distribution element are dimensioned in such a way that they allow the locking screw to pass freely.

In addition, the bearing housing of the associated roller bearing arrangement is equipped with a radially extending internal thread, into which the locking screw of the damping device engages in the assembled state. This means that the roller bearing arrangement and its associated damping device can be safely and precisely positioned via the locking screw and the pressure distribution element.

The damping devices described above for the roller bearing arrangements of open-end rotor spinning devices, in which damping elements are fixedly arranged on a special bearing sleeve at the end, not only lead to a relatively high total weight of the roller bearing arrangement, but are also costly due to their relatively complex construction. In the past, therefore, roller bearing arrangements with damping devices have already been proposed, which are more cost-effective to manufacture due to their simple structural design.

In the CZ 17947 U1 For example, a roller bearing arrangement with a damping device is described, in which the damping device is formed by simple, elastic rings.
The two elastic rings each have a circumferential elevation in the area of their inner surface, which corresponds to a corresponding groove in the area of the outer circumference of the bearing housing of the roller bearing arrangement.

The need for additional grooves in the bearing housing of the roller bearing arrangement and the structured shape of the elastic rings, however, have a negative effect on the costs of such roller bearing arrangements.

Furthermore, through the DE 20 2010 005 587 U1 a roller bearing arrangement for open-end rotor spinning devices is known, the damping device of which is formed by two annular elastic members, which in turn each have an inner and an outer elastic ring which are connected, for example, via elastic webs.
The inner rings are permanently fixed on the bearing housing of the roller bearing arrangement, while the outer web is clamped in the assembled state with pretension in the housing of the open-end rotor spinning device.
Although these known damping devices are inexpensive, they generally only have a relatively limited service life, that is to say, damping devices of this type have to be renewed relatively often.

Starting from the aforementioned prior art, the invention is based on the object of further developing the known roller bearing arrangements for an open-end rotor spinning device, in particular their damping devices, so that they are not only solidly built and are characterized by a relatively long service life, but also are inexpensive to manufacture.
In addition, in these damping devices, the pretension with which the damping devices are fixed in the housing of the open-end rotor spinning device should be adaptable in a relatively simple manner if necessary.

This object is achieved according to the invention in that the damping device has two damping means which are spaced apart in the assembled state on the bearing housing of the roller bearing arrangement and each consist of an internal, sleeve-like, stable bearing ring and an elastic component permanently fixed on the bearing ring, which is preloaded in the housing the open-end rotor spinning device can be fixed.

Advantageous embodiments of the invention are the subject of the dependent claims.

The embodiment of the damping device according to the invention for a roller bearing arrangement has the particular advantage that a secure and long-lasting fastening of the damping means on the bearing housing of a roller bearing arrangement can be ensured in a simple manner, the damping device neither requiring a special bearing sleeve to accommodate damping elements nor in the bearing housing the roller bearing assembly a groove for a plastic clamping ring must be incorporated.

The bearing housing also does not require any circumferential grooves at the end for circumferential elevations of elastic damping rings.
The connection of the inner bearing rings of the damping device, each equipped with a permanently fixed elastic component rather, the bearing housing of the roller bearing arrangement is carried out in a simple manner by means of a press fit.
Such a press fit represents a long-lasting, safe and inexpensive type of fastening that has proven itself in mechanical engineering.

Fixing the elastic components in the housing of the open-end rotor spinning device by means of pre-tensioning also represents an advantageous type of fastening, by means of which the effort for the production and assembly of the damping device can be minimized. In an advantageous embodiment it is provided that the bearing ring is made of a metallic material, for example aluminum.
As is well known, aluminum is not only insensitive to corrosion, but such a bearing ring made of aluminum is also quite stable despite its low weight and represents an advantageous component that can be fixed in a simple manner, preferably by means of an interference fit, on the steel bearing housing of a roller bearing arrangement. Furthermore, an elastic component can easily be fixed on such a bearing ring made of aluminum, for example by vulcanization.

The elastic component is preferably made of an elastomer which, as indicated above, is vulcanized onto the bearing ring.

For the optimal setting of the damping capacity of the damping device, the elastic components of the damping means can be made of different, different elastomers, that is, the elastic component of the damping means arranged in the area of the rotor housing can be made of a different elastomer than the elastic component of the im Damping means installed in the area of the drive whorl.

Of course, an elastic component can also consist of several elastomers at the same time.

In an advantageous embodiment, it is further provided that the elastic component can be subjected to a grinding process after vulcanization on the bearing ring and can be ground to a predeterminable diameter.
In this way it is ensured that the elastic components and thus the damping means always have a predeterminable pretension after the damping device has been installed in the housing of the open-end rotor spinning device.
Such a predeterminable bias ensures on the one hand that the damping means is securely fastened in the housing of the open-end rotor spinning device and on the other hand it ensures that the damping effect is uniformly effective.
This means that the elastic buffer elements, ground to a predefinable diameter and built into the housing of the open-end rotor spinning device with a predefinable preload, ensure that the damping properties with which the roller bearing arrangement and thus the spinning rotor rotating at high speed in the roller bearing arrangement during the spinning process are stored in the housing of the open-end rotor spinning device, are always optimal.

Further details of the invention can be gathered from an exemplary embodiment illustrated below with reference to the figures.

• 1 eine Offenend-Rotorspinnvorrichtung mit einem Spinnrotor, der in einer Wälzlageranordnung nach einem Ausführungsbeispiel rotierbar gelagert ist, wobei die Wälzlageranordnung über eine Dämpfungseinrichtung im Gehäuse der Offenend-Rotorspinnvorrichtung abgestützt ist,
• 2 in einem größeren Maßstab sowie im Schnitt, die in 1 schematisch angedeutete Wälzlageranordnung mit ihrer zugehörigen Dämpfungseinrichtung.

It shows:

• 1 an open-end rotor spinning device with a spinning rotor, which is rotatably mounted in a roller bearing arrangement according to one embodiment, the roller bearing arrangement being supported via a damping device in the housing of the open-end rotor spinning device,
• 2 on a larger scale as well as in section that in 1 schematically indicated roller bearing arrangement with its associated damping device.

The 1 shows a perspective view of an open-end rotor spinning device 1 an open-end rotor spinning machine, the spinning rotor with its rotor shaft 4th in a roller bearing arrangement 5 is mounted, which in turn has a damping device in a housing 9 the open-end rotor spinning device 1 is supported.

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

The open-end rotor spinning devices 1 are often each mounted on a stationary, machine-length bearing axis of the open-end rotor spinning machine so as to be pivotable to a limited extent via a bearing device. During the spinning operation, the spinning rotors are such open-end rotor spinning devices 1 for example, by a rotating, machine-length tangential belt 7th holding the rotor shaft 4th of the spinning rotor contacted from above, driven.

In the embodiment shown in the figures, a representation of such a known spinning rotor has been dispensed with for reasons of better clarity.

How out 1 can be seen, have such open-end rotor spinning devices 1 a vacuum pressurizable rotor housing 6th on that by a cover element 8th or by one in the cover element 8th integrated sealant is closable.
In the rotor housing 6th During the spinning process, the spinning cup of the spinning rotor rotates at high speed, the spinning rotor in a roller bearing arrangement 5 is rotatably mounted, which, as in 2 shown in detail, in turn via a damping device 2 in the housing 9 of the open-end rotor spinning devices 1 is supported.

As already indicated above and in 1 shown is the housing 9 with the open-end rotor spinning device closed 1 positioned so that the rotor shaft 4th of the spinning rotor 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 case 9 in contrast, positioned in an inoperative position, that is, the rotor shaft 4th stands at a distance from the further circulating tangential belt 7th .
In this inoperative position there is also a braking element 13 on the rotor shaft 4th and ensures that the spinning rotor is stationary.

Such open-end rotor spinning devices 1 also have a so-called sliver opening device 12 .
In the opening roller housing 11 such sliver opening devices 12 is usually a rotatable opening roller 17th stored, which is driven during the spinning operation, for example by a further, also machine-long (not shown) tangential belt.
Furthermore is in the opening roller housing 11 such sliver opening devices 12 each a so-called sliver intake cylinder 18th arranged, the drive takes place for example via a (not shown) individual drive.
As in 1 are indicated in such open-end rotor spinning devices 1 the axes of rotation during the spinning process 20th , 21st the opening roller 17th or of the sliver intake cylinder 18th orthogonal to the axis of rotation 3 of the spinning rotor arranged.

In 2 is a rolling bearing arrangement 5 for a spinning rotor shown on a larger scale. As can be seen, the roller bearing assembly is 5 by means of a damping device 2 limited mobility in the housing 9 an open-end rotor spinning device 1 supported.
As is known per se, the roller bearing arrangement has 5 Via a bush-like, usually steel, bearing housing 16 , in the spaced apart two outer raceways for rolling bearings 14th are incorporated.
As is usual with roller bearing arrangements, the roller bearing bodies of the roller bearings are supported 14th in the assembled state also in opposite inner raceways of a steel shaft that forms the rotor shaft 4th a spinning rotor forms.

Such rolling bearing arrangements 5 usually also have so-called gap seal arrangements 19th that ensure that there is a lubricant in the area of the rolling bearings 14th is held, or which prevent dirt from entering the roller bearing assemblies 5 can penetrate.

The damping device 2 exists, as in 2 shown, preferably from two spaced apart damping means 15th , which in turn each have an internal, sleeve-like, stable bearing ring 22nd and one on the bearing ring 22nd permanently fixed elastic buffer element 23 consist.
The bearing ring is in the assembled state 22nd , preferably by means of a press fit, on the bearing housing 16 the roller bearing arrangement 5 set while the elastic buffer element 23 with preload in the housing 9 the open-end rotor spinning device 1 is fixed.

The sleeve-like, stable bearing ring 22nd is advantageously made of a metallic material, for example aluminum, while the elastic buffer element 23 preferably made of an elastically deformable plastic, a so-called elastomer.

In an advantageous embodiment, the elastic buffer element is 23 on the bearing ring 22nd vulcanized and thus permanently connected to the bearing ring.

The elastic buffer elements 23 the damping agent 15th a damping device 2 can be manufactured differently.
The two buffer elements 23 the damping agent 15th a damping device 2 can for example be made of the same elastomer or, if the respective requirements suggest it, of different elastomers.
Furthermore, an elastic buffer element 23 If necessary, however, they can also be made from different, different elastomers at the same time and thus optimally adapted to the respective requirements.

The elastic buffer elements are advantageously 23 after vulcanizing on the bearing ring 22nd In addition, each is subjected to a grinding process and is ground exactly to a predeterminable diameter D in the process.
That is, the buffer elements 23 and thus also the damping means 15th get a diameter D, which ensures that the elastic buffer elements 23 and with it the damping means 15th after installing the damping device 2 in the housing 9 the open-end rotor spinning device 1 always with a predefinable preload in the housing 9 are set.

List of reference symbols

1

Open-end rotor spinning device

2

Damping device

3

Axis of rotation

4th

Rotor shaft

5

Rolling bearing arrangement

6

Rotor housing

7th

Tangential belt

8th

Cover element

9

casing

11

Opening roller housing

12

Sliver opening device

13

Braking element

14th

roller bearing

15th

Dampening agents

16

Bearing housing

17th

Opening roller

18th

Sliver intake cylinder

19th

Gap seal arrangement

20th

Axis of rotation

21st

Axis of rotation

22nd

Bearing ring

23

Buffer element

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 3314547 A1 [0007]
• DE 3837733 A1 [0007]
• DE 102004007758 A1 [0012]
• CZ 17947 U1 [0015]
• DE 202010005587 U1 [0017]

Claims (8)

Rolling bearing arrangement (5) for an open-end rotor spinning device (1), with two spaced apart rolling bearings (14) for the rotatable mounting of a rotor shaft (4) of a spinning rotor that rotates at high speed during spinning and one on a bearing housing (16) of the rolling bearing arrangement (5) ) positioned damping device (2), by means of which the bearing housing (16) of the roller bearing arrangement (5) can be supported in a housing (9) of the open-end rotor spinning device (1) with limited movement, characterized in that the damping device (2) is two spaced apart in the assembled state has damping means (15) arranged on the bearing housing (16) of the roller bearing arrangement (5), each of which consists of an internal, sleeve-like, stable bearing ring (22) and an elastic buffer element (23) permanently fixed on the bearing ring (22), which with Bias in the housing (9) can be fixed. Rolling bearing arrangement (5) according to Claim 1 , characterized in that the bearing ring (22) is made of a metallic material. Rolling bearing arrangement (5) according to Claim 2 , characterized in that the bearing ring (22) is made of aluminum. Rolling bearing arrangement (5) according to one of the preceding claims, characterized in that the bearing ring (22) can be fixed by means of a press fit on the bearing housing (16) of the rolling bearing arrangement (5). Rolling bearing arrangement (5) according to Claim 1 , characterized in that the elastic buffer element (23) of the damping means (15) consists of an elastomer which is vulcanized onto the bearing ring (22). Rolling bearing arrangement (5) according to Claim 1 , characterized in that the elastic buffer element (23) of the damping means (15) is made of different, different elastomers. Rolling bearing arrangement (5) according to Claim 5 , characterized in that the elastic buffer element (23) after vulcanizing on the bearing ring (22) can be subjected to a grinding process and can be ground to a predeterminable diameter (D). Rolling bearing arrangement (5) according to one of the preceding claims, characterized in that the damping means (15) can each be installed in the housing (9) with a predeterminable preload.

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