MULTI-ROW ROLLING BEARING

Abstract

A multi-row rolling bearing having an inner ring and an outer ring and at least two axial rolling bearing rows for supporting axial forces between the inner and outer ring, wherein the two axial rolling bearing rows are seated on opposite axial sides of a radially projecting annular lug which engages in an annular groove and which is supported by means of said axial rolling bearing rows against the annular groove. According to the invention, at least one of the axial rolling bearing rows is formed as an angular-contact roller bearing with an angle of inclination of greater than 0 to at most 45.

Claims

1. A multirow roller bearing, in particular an open centered large roller bearing, having an inner ring (2) and an outer ring (3) as well as at least two axial roller bearing rows (8, 9) for supporting axial forces between the inner and outer ring, wherein the two axial roller bearing rows (8, 9) are seated on oppositely disposed axial sides of a radially projecting ring nose (4) that engages in a ring groove (5) and that is supported by the axial roller bearing rows (8, 9) at the ring groove (5), characterized in that at least one of the two axial roller bearing rows (8, 9) is formed as a taper roller bearing having an inclination angle (a) of more than 0 to a maximum of 45.

2. A multirow roller bearing in accordance with claim 1, wherein the inclination angle () is formed in the range from more than 0 to a maximum of 10 or in the range from 1 to 8.

3. A multirow roller bearing in accordance with claim 1, wherein the inclination angle () is formed in the range from more than 10 to 35 or in the range from 15 to 30.

4. A multirow roller bearing in accordance with claim 1, wherein both or all of the axial roller bearing rows (8, 9) are formed as taper roller bearings having inclination angles (a) of the same amount.

5. A multirow roller bearing in accordance with claim 1, wherein the two axial roller bearing rows (8, 9) are inclined such that the axial roller bearing rows (8, 9) counteract a radial penetration of the ring nose (4) into the ring groove (5).

6. A multirow roller bearing in accordance with claim 5, wherein the axial roller bearing rows (8, 9) are the only bearing rows between the ring nose (4) and the ring groove (5) and/or the multirow roller bearing is formed free of separate radial bearings overall.

7. A multirow roller bearing in accordance with claim 5, wherein the multirow roller bearing has exactly two roller bearing rows.

8. A multirow roller bearing in accordance with claim 1, herein the two axial roller bearing rows (8, 9) are inclined such that the axial roller bearing rows (8, 9) counteract a radial moving away of the ring nose (4) from the ring groove (5).

9. A multirow roller bearing in accordance with claim 8, wherein a separate radial bearing (11) is provided that counteracts a radial moving in of the outer ring (3) toward the inner ring (2).

10. A multirow roller bearing in accordance with claim 9, wherein the separate radial bearing (11) is between an end face of the ring nose (4) and a base of the ring groove (5) and is arranged approximately centrally between the axial roller bearing rows (8, 9).

11. A multirow rolling bearing in accordance with claim 1, wherein at most one radial bearing row (11) is provided.

12. A multirow roller bearing in accordance with claim 1, wherein rolling elements (10) of the axial roller bearing rows (8, 9) are formed as cylinder rollers.

13. A multirow roller bearing in accordance with claim 1, herein an angle ((3) between an axial running surface (4a, 4b; 5a, 5b) at the ring nose (4) or at the ring groove (5) and an adjacent lateral run-on surface for rolling elements (10) of the axial roller bearing rows (8, 9) amounts to 90 or less.

14. A multirow roller bearing in accordance with claim 1, wherein the axial roller bearing rows (8, 9) are arranged axially aligned with one another and/or have the same bearing diameter.

15. A multirow roller bearing in accordance with claim 1, wherein the axial roller bearing rows (8, 9) have rolling elements (10) of the same diameter and have the same pressure angle.

16. A multirow roller bearing in accordance with claim 1, wherein at least one of the inner or outer rings (2, 3) is provided with a toothed portion (7), with the inner ring (2) or the outer ring (3) having the ring nose (6) having the toothed portion (8).

17. A multirow roller bearing in accordance with claim 1, wherein the ring nose (4) is provided at the outer ring and the ring groove (5) is provided at the inner ring (2).

18. A multirow roller bearing in accordance with claim 1, wherein the inner ring (2) or the outer ring (3) has the ring groove (5), and wherein the inner ring (2) or the outer ring (3) having the ring groove (5) is formed in two or more parts and has a dividing plane (6) that extends approximately perpendicular to the axis of rotation of the multirow roller bearing and divides the ring groove (5) in the region of a base of the ring groove (5).

19. A multirow roller bearing in accordance with claim 1, wherein the multirow roller bearing is formed as a large roller bearing having a ring diameter of more than 1 m or more than 2.5 m or more than 4 m.

20. A multirow roller bearing in accordance with claim 1, wherein at least one of the inner and outer rings (2, 3) is formed as segmented.

21. A construction machine, in particular a crane or an excavator, comprising the multirow roller bearing of claim 1.

22. A construction machine in accordance with claim 21, wherein the multirow roller bearing supports a slewing platform of the construction machine rotatable about an upright axis at an undercarriage of the construction machine.

23. A wind turbine having a rotor that has a plurality of rotor blades adjustably supported at a hub, wherein the wind turbine has at least one multirow roller bearing of claim 1 to support a rotor blade of the rotor blades at the hub or to support the hub at a nacelle of the wind turbine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The invention will be explained in more detail in the following with reference to embodiments and to associated drawings. There are shown in the drawings:

[0033] FIG. 1: a partial sectional view of a roller bearing in accordance with an embodiment of the invention in which two axial roller bearing rows are inclined such that the axial roller bearing rows counteract a radial moving away of the two bearing rings, with an additional radial bearing counteracting a moving in of the bearing rings,

[0034] FIG. 2: a partial sectional view of a roller bearing in accordance with a further advantageous embodiment of the invention in which two axial roller bearing rows are inclined such that the axial roller bearing rows counteract a radial moving in of the two bearing rings, with an additional radial bearing being completely dispensed with,

[0035] FIG. 3: a partial sectional view of a roller bearing similar to FIG. 1 in accordance with a further embodiment of the invention in which the two axial roller bearing rows are more inclined than in FIG. 1,

[0036] FIG. 4: a partial sectional view of a roller bearing similar to FIGS. 1 and 3 in accordance with a further embodiment of the invention in which only one of the axial roller bearing rows is inclined to counteract a radial moving away of the two bearing rings, while the other axial roller bearing is formed as a purely axial roller bearing without inclination; and

[0037] FIG. 5: a partial sectional view of a conventional non-inclined roller bearing in a three-row design.

DETAILED DESCRIPTION

[0038] As the Figures show, the roller bearing 1 comprises an inner ring 2 and an outer ring 3 that are rotatably supported with respect to one another by a plurality of roller bearing rows, with said roller bearing rows being able to be arranged between a radially projecting rig nose 4 and a ring groove 5 into which said ring nose 4 engages.

[0039] As FIG. 1 shows, said ring nose 4 can be provided at the outer ring 3 and can project radially inwardly from the inner periphery of the outer ring 3, with in this case the ring groove 5 being able to be provided at the inner ring 2 and being able to be formed in its outer periphery. Independently of the provision at the inner ring or outer ring, the ring nose 4 can be provided approximately centrally at half the height of the respective bearing ring, which can also apply to the ring groove 5 at the respective other bearing ring.

[0040] As the Figures show, the bearing ringin the case of FIG. 1 the inner ring 2having the ring groove 5 can be configured as divided, with the dividing plane 6 being able to be oriented approximately perpendicular to the axis of rotation of the roller bearing 1 and/or being able to extend through the base of the ring groove 5. The dividing plane 6 here advantageously extends off center with respect to the base of the ring groove 5, for example at approximately a third or two thirds of the height or width of the ring groove 5 to not be in the region of the axial roller bearings, on the one hand, and to not lie in the region of any radial bearing, on the other hand.

[0041] The bearing ring 4in the case of the drawings the outer ring 3having the ring nose can be formed in one piece and can optionally have a toothed portion 7 at which the pinion of a rotary drive of a slewing gear can engage. Said toothed portion 7 can, for example, be provided at the outer peripheral side of the outer ring 3.

[0042] As the Figures show: the roller bearing 1 can have two axial roller bearing rows 8 and 9 that can be arranged on oppositely disposed axial sides of said ring nose 4 and that can support the ring nose 4 at the flanks of the ring groove 5. Said axial roller bearing rows 8 and 9 are here advantageously both formed as taper roller bearings having an inclination angle in the range from more than 0 to a maximum of 45, with said inclination angle advantageously being able to be in the range from more than 10 to 30 or 15 to 25.

[0043] The rolling element 10 of said taper roller bearings are here advantageously cylinder rollers that run on inclined axial tracks 4a and 4b at the ring nose 4 and axial tracks 5a and 5b at the ring groove 5. Said axial tracks 4a and 4b of the ring nose 4 and the axial tracks 5a and 5b at the side flanks of the ring groove 5 can be inclined in the same manner, i.e. can have the same inclination angle that can be measured with respect to a plane perpendicular to the axis of rotation of the roller bearing 1.

[0044] Said cylinder rollers can here generally be dimensioned differently, with it being able to be advantageous if the cylinder diameter roughly approximately amounts to the cylinder width, for example 75% to 150% of the cylinder width, with different cylinder geometries also being able to be selected, however.

[0045] As the Figures show, said axial roller bearing rows 8 and 9 can be oriented aligned with one another viewed in the axial bearing direction or can be arranged on the same pitch circle diameter.

[0046] As the Figures show, the angle between the respective axial tracks 4, 4b or 5a, 5b and the lateral run-on surface for the rolling elements 10 can advantageously be formed as 90 or less and/or can be selected independently of the inclination angle of the axial track. In FIG. 1, said angle is entered for a raceway 4a of the ring nose 4 and for an associated lateral run-on surface of the outer ring 3. Analogously, the angle can, however, also be selected between an axial track 5a or 5b at the ring groove side and the associated lateral run-on surface of the inner ring 2.

[0047] As FIGS. 1 and 3 show, the axial roller bearing rows 8 and 9 can be inclined or the angle can be oriented such that the axial roller bearing rows 8 and 9 counteract a moving away of the ring nose 4 from the ring groove 5. The ring nose 4 can in particular spread toward the base of the ring groove 5 due to the inclination of the axial tracks 4a and 4b so that the axial roller bearing rows 8 and 9 hold the ring nose 4 in the ring groove 5 and counteract a running apart of the inner ring 2 and the outer ring 3.

[0048] As FIG. 1 shows, each of the axial roller bearing rows 8 and 9 can have an inclination angle of, for example, approximately 5. Alternatively, FIG. 3 shows an embodiment having more inclined axial roller bearing rows 8 and 9, with the inclination angle here being able to amount to 30, for example.

[0049] In order also to counteract a moving in of the outer ring 3 to the inner ring 2, i.e. a deeper dipping of the ring nose 4 into the ring groove 5, the roller bearing 1 can have, in addition to the two axial roller bearing rows 8 and 9, a radial roller bearing row 11 that can advantageously be arranged between the end face of the ring nose 4 and the base of the ring groove 5, in particular approximately centrally between the two axial roller bearing rows 8 and 9. Said radial roller bearing row 11 can here likewise have cylinder rollers, but optionally also differently shaped rolling elements.

[0050] The rolling elements 12 of the radial roller bearing row 11 are advantageously dimensioned considerably smaller than the rolling elements 10 of the axial roller bearing rows 8 and 9. The diameter of the rolling elements 12 of the radial roller bearing row 11 can, for example, amount to less than 50% or less than 30% of the diameter of the rolling elements 10 of the axial roller bearing rows 8 and 9.

[0051] As FIG. 4 shows, only one axial roller bearing row 9 can optionally also be inclined, for example at an inclination angle in the range from 5 to 45 or 10 to 35 or 15 to 30, for example 30. The other axial roller bearing row 8 can form a purely axial bearing and/or can be formed without a bevel so that the main direction of moving away of this second axial roller bearing row 8 extends in the axial direction.

[0052] In such an embodiment with only one inclined axial roller bearing row 9, the inclination can be established in the manner described above such that a moving away of the ring nose 4 from the groove is counteracted. To also counteract a moving in or dipping, a radial bearing 11 can likewise be used in the manner described above that can advantageously be arranged between the two axial roller bearing rows 8 and 9 when viewed in the radial direction, cf. FIG. 4.

[0053] In the embodiment in accordance with FIG. 2, said axial roller bearing rows 8 and 9 are inclined so-to-say oppositely in comparison with FIG. 1 so that the axial roller bearing rows 8 and 9 do not counteract a running apart, but rather counteract a moving in of the inner and outer rings 2 and 3, i.e. the axial roller bearing rows 8 and 9 counteract a deeper dipping of the ring nose 4 into the ring groove 5. As FIG. 2 shows, the axial tracks 4a and 4b can the inclined at the ring nose 4 such that the ring nose 4 tapers toward the base of the ring groove 5 in the region of said axial tracks 4a and 4b.

[0054] Since a moving in of the outer ring 3 to the inner ring 2 is also prevented in the radial direction by the inclination of the axial roller bearing rows 8 and 9, an additional radial bearing can be completely dispensed with in the embodiment in accordance with FIG. 2 so that the roller bearing 1 is formed with only two rows in total and all the axial and radial forces are only absorbed by the two said axial roller bearing rows 8 and 9.

[0055] Reference can be made in another respect to the description of FIGS. 1 and 3 that also applies to FIG. 2 to this extent with regard to the remaining design of the inner and outer rings 2 and 3, to the inclination of the axial tracks 4a, 4b and 5a, 5b, to the formation of the rolling elements 10, and to said angles and .

[0056] Even if it is not shown separately in the embodiment of FIG. 2, the inclination angle can optionally be selected as larger, for example approximately 30. It can also be considered here to only incline one of the two axial roller bearing rows while the other one of the two axial roller bearing rows can have no inclination or can be formed as a purely axial bearing.

[0057] In comparison with FIGS. 1 and 2, FIG. 5 shows a conventional roller bearing 1 per se with non-inclined axial roller bearings.

[0058] All the roller bearings 1 in accordance with FIG. 1 or FIG. 2 can be sealed by a seal 13 in the region of the gap between the two inner and outer rings 2 and 3.

[0059] The inner ring 2 and/or the outer ring 3 can each be formed in a segmented manner.