SHAFT BEARING FOR MOUNTING A SPINNING ROTOR OF A ROTOR SPINNING MACHINE

Abstract

The invention relates to a shaft bearing for mounting a spinning rotor of a rotor spinning machine, with a double-row rolling bearing, which comprises two rolling-body rows that roll on their inner side without an inner ring, on two inner bearing races arranged at a distance from one another on a rotor shaft, and on their outer side on outer bearing races of two separate outer rings. According to the invention, the outer rings are mounted resiliently in a shaft bearing housing so as to provide a shaft bearing for mounting a spinning rotor of a rotor spinning machine with high reliability, even at rotational speeds of more than 110,000 revolutions per minute, which shaft bearing also allows trouble-free operation of a rotor spinning machine equipped with the shaft bearing.

Claims

1. A shaft bearing (1) for mounting a spinning rotor of a rotor spinning machine, comprising a double-row rolling-element bearing having two rows (20a, 20b) of rolling members, which, on the inside, roll, without any inner ring, on two inner raceways (4) spaced apart from one another on a shaft, in particular on a rotor shaft (2), and which, on the outside, roll on outer raceways (6), wherein on the outside, the rows (20a, 20b) of rolling members roll on outer raceways (6) of two separate outer rings (5a, 5b) that are spaced apart from one another in a longitudinal axis direction of the rotor shaft (2), and the outer rings (5a, 5b) are in turn borne in a shaft bearing housing (10) in a resiliently movable manner.

2. The shaft bearing (1) according to claim 1, wherein the outer rings (5a, 5b) are borne in the shaft bearing housing (10) by means of at least one bearing member (11a, 11b) supported against the outer rings (5a, 5b) and the shaft bearing housing (10), the at least one bearing member (11a, 11b) either being formed from a resilient unit (14a, 14b), at least in some portions, in the region between the outer rings (5a, 5b) and the shaft bearing housing (10), or enclosing the resilient unit (14a, 14b) at least in a radial or an axial direction of the rotor shaft (2).

3. The shaft bearing (1) according to claim 2, wherein the bearing member (11a, 11b) surrounds the resilient unit (14a, 14b) at least in the radial or axial direction and is interlocked with the resilient unit (14a, 14b) at least on one side in the enclosing direction.

4. The shaft bearing (1) according to either claim 1 or claim 2, wherein the bearing member (11a, 11b) is formed entirely from the resilient unit (14a, 14b).

5. The shaft bearing (1) according to either claim 1 or claim 2, wherein the outer rings (5a, 5b) are borne in the shaft bearing housing (10) by means of separate bearing members (11a, 11b), which are preferably spaced apart from one another.

6. The shaft bearing (1) according to either claim 1 or claim 2, wherein a lubricant reservoir (15) is arranged in the region between the outer rings (5a, 5b).

7. The shaft bearing (1) according to claim 6, wherein lubricant reservoir (15) has a foam member configured for storing the lubricant, in particular lubricating oil.

8. The shaft bearing (1) according to claim 7, wherein a reservoir support (17) which separates the lubricant reservoir (15), in particular the foam member, from the rotor shaft (2).

9. The shaft bearing (1) according to claim 8, wherein the shaft bearing housing (10) has a closable lubricant filling opening (19) adjacent to the lubricant reservoir (15).

10. The shaft bearing (1) according to claim 1, wherein the rolling-element bearing is configured as a ball bearing and the rows (20a, 20b) of rolling members are configured as rows of balls.

11. The shaft bearing (1) according to claim 2, wherein the resilient unit (14a, 14b) is formed by a spring element made of a metal or non-metal material, by a damping element made of a plastics-containing material or by a fluid damping unit.

Description

[0026] An embodiment example of the invention is explained below with reference to the drawings, in which:

[0027] FIG. 1 is a schematic sectional view of an embodiment of a shaft bearing according to a preferred embodiment example.

[0028] FIG. 1 is a first sectional view of an embodiment of a shaft bearing 1 for rotatably holding a rotor shaft 2 of a spinning rotor (not shown here) of a rotor spinning machine. To rotatably bear the rotor shaft 2, the shaft bearing 1 has a first and a second bearing portion 21, 22, in each of which the rotor shaft 2 has an inner raceway 4, which are worked into the surface of the rotor shaft 2 in a manner spaced apart from one another in the axial direction. In this preferred embodiment example, the inner raceways 4 are each used for holding rolling members 3, which are configured as balls, of a row 20a, 20b of rolling members of the first and the second bearing portion 21, 22, each row being formed as a row of balls. The rolling members 3 of the rows 20a, 20b of rolling members are in turn borne in outer rings 5a, 5b, which, when viewed in the axial direction, are separate from one another and extend coaxially with the rotor shaft 2, cages 7 fixing the rolling members 3 of the rows 20a, 20b of rolling members in place relative to one another in the circumferential direction.

[0029] The outer rings 5a, 5b of the first and the second bearing portion 21, 22, said rings each having an outer raceway 6 for bearing the rolling members 3, are in turn each resiliently displaceably borne in a shaft bearing housing 10 by means of bearing members 11a, 11b. The bearing members 11a, 11bare separate from one another. According to an embodiment example that has not been shown, a common bearing member is provided. In this embodiment example, the bearing member or the bearing members 11a, 11b is/are supported directly against both the outer surface of the outer rings 5a, 5b and the inside of the shaft bearing housing 10 by means of a resilient unit 14a, 14b. According to an embodiment example that has not been shown, in order to be arranged on the outer rings 5a, 5b and on the inside of the shaft bearing housing 10, respectively, the bearing member 11a, 11b can have a first bearing member element abutting the outer surface of the outer rings 5a, 5b and a second bearing member element abutting the inside of the shaft bearing housing 10. In the process, the second bearing member element is supported relative to the associated first bearing member element by means of a resilient unit 14a, 14b. The support by means of the resilient unit 14a, 14b enables resilient movement of the outer rings 5a, 5b, and thus of the rotor shaft 2, in the axial, radial and circumferential directions. Due to its resilient properties, the resilient unit 14a, 14b damps the movements of the rotor shaft 2 in the process.

[0030] When viewed in the axial direction of the rotor shaft 2, a lubricant reservoir 15 formed as a foam member is arranged inside the shaft bearing housing 10 between the outer rings 5a, 5b and is spaced apart from the rotor shaft 2 by means of a spacer. For this purpose, the spacer has a reservoir support 17 in the form of a lubricant sleeve that is arranged coaxially with the rotor shaft 2 and which, according to this preferred embodiment example, comprises a circumferential ridge that supports the reservoir support 17 against the inside of the shaft bearing housing 10, the lubricant reservoir 15 thus additionally providing a separate lubricant reservoir 15 for each bearing portion 21, 22. According to an embodiment example that has not been shown, the ridge is permeable to lubricant, or according to another embodiment example that has not been shown, the reservoir support 17 is not configured having a ridge, and so a common lubricant reservoir 15 that supplies both bearing portions 21, 22 is provided.

[0031] Filling openings 19 made in the shaft bearing housing 10 are used for filling the lubricant reservoir 15 with lubricant, which is guided inside the shaft bearing housing 10 towards the first and the second bearing portion 21, 22. To prevent lubricant escaping from the shaft bearing 1, the outer rings 5a, 5b are sealed relative to the rotor shaft 2 by means of shaft seals 8.

LIST OF REFERENCE SIGNS

[0032] 1 Shaft bearing

[0033] 2 Rotor shaft

[0034] 3 Rolling member

[0035] 4 Inner raceway

[0036] 5a, 5b Outer ring

[0037] 6 Outer raceway

[0038] 7 Cage

[0039] 8 Shaft seal

[0040] 10 Shaft bearing housing

[0041] 11a, 11b Bearing member

[0042] 14a, 14b Resilient unit

[0043] 15 Lubricant reservoir

[0044] 17 Reservoir support

[0045] 19 Filling opening

[0046] 20a, 20b Row of rolling members

[0047] 21 First bearing portion

[0048] 22 Second bearing portion