Roller bearing with preloading

Abstract

The invention relates to a roller bearing with preloading that comprises a first bearing ring, a second bearing ring and roller members disposed between these two parts, and at least one elastic element that is disposed on the first bearing ring or on a component connected to the first bearing ring and that exercises a preload force on the second bearing ring. According to the invention the preload force generated by the elastic element is transferred to the second bearing ring by means of at least one first bearing. The bearings are preferably fluid dynamic bearings. However, additional roller bearings may be used.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective sectional view of a first embodiment of a radial deep groove ball bearing according to the invention.

FIG. 2 shows a section through the deep groove ball bearing according to FIG. 1.

FIG. 2 a shows an enlarged view of detail B in FIG. 2.

FIG. 3 shows an enlarged view of detail A in FIG. 2.

FIG. 4 shows a modified form of a deep groove ball bearing in an enlarged view similar to FIG. 3.

FIG. 5 shows a perspective sectional view of a second embodiment of a radial deep groove ball bearing according to the invention.

FIG. 6 schematically shows a section through a further embodiment of a roller bearing according to the invention.

FIG. 7 schematically shows an embodiment of the elastic element.

FIG. 8 schematically shows an enlarged view of the bearing region between the annular component and the outer bearing ring in FIG. 6.

FIG. 9 shows an S-shaped spring element.

FIG. 10 shows a U-shaped spring element.

FIG. 11 shows a rubber-elastic element.

Claims

1. A roller bearing having a first bearing ring, a second bearing ring and roller members disposed between the first bearing ring and second bearing ring, and at least one elastic element that is disposed on the first bearing ring or on a component connected to the first bearing ring and that exercises a preload force on the second bearing ring, characterized in thatthe preload force generated by the elastic element (18; 118; 218; 318; 322; 418; 518; 618) is transferred to the second bearing ring by means of the first bearing.

2. A roller bearing according to claim 1, characterized in that the elastic element (18; 118; 218; 318; 322; 418; 518) is a spring elastic element, a spring washer or a Belleville spring washer.

3. A roller bearing according to claim 1, characterized in that the elastic element (18; 118; 218; 418; 518) has a radial flange (20; 120; 220) that lies opposite an end face (22; 122; 222) of the second bearing ring, the first bearing being disposed between the radial flange and the end face of the second bearing ring.

4. A roller bearing according to claim 1, characterized in that the elastic element (318; 322) rests against a first annular component (320) that lies opposite an end face of the second bearing ring, the first bearing being disposed between the first annular component (320) and the face of the second bearing ring.

5. A roller bearing according to claim 1, characterized in that the elastic element (18; 218; 318; 322) is fixedly connected to the first bearing ring.

6. A roller bearing according to claim 1, characterized in that the elastic element (118; 418; 518) has a second radial flange (130) that lies opposite an end face of the first bearing ring or a component (128) connected to the first bearing ring, a second bearing being disposed between the radial flange and the face of the first bearing ring or of the component.

7. A roller bearing according to claim 1, characterized in that the elastic element (318; 322) rests against a second annular component that lies opposite a face of the first bearing ring, a second bearing being disposed between the second annular component and the face of the first bearing ring.

8. A roller bearing according to claim 1, characterized in that the elastic element (618) has a rubber-elastic core (619) that has a sliding coating (620) on at least one side, the coating lying opposite an associated end face of a bearing ring, the first and/or the second bearing being disposed between the coating and the end face of the associated bearing ring.

9. A roller bearing according to claim 7, characterized in that it is sealed by means of the elastic element (18; 118; 218; 318; 322; 418; 518; 618) and/or at least one of the annular components (320).

10. A roller bearing according to claim 4, characterized in that the first and/or the second bearing is a fluid dynamic bearing whose bearing surfaces are formed by the surfaces facing each other of the flange (20; 120; 130; 220) of the elastic element (18; 118; 218; 418; 518) or of the annular component (320) respectively and the face of the associated bearing ring.

11. A roller bearing according to claim 10, characterized in that one of the bearing surfaces facing each other of the first and/or of the second fluid dynamic bearing has a grooved pattern (24; 124; 132) that is at least proportionally filled with a bearing fluid.

12. A roller bearing according to claim 11, characterized in that the grooved pattern (24; 124; 132) is a pumping pattern for the purpose of distributing the bearing fluid between the bearing surfaces facing each other of the first and/or of the second bearing.

13. A roller bearing according to claim 11, characterized in that a free space (26; 126; 134; 324) is provided in the end face of the first and/or of the second bearing ring or of the component connected to the first bearing ring at the inside and/or at the outside diameter of the bearing surface, the space being at least proportionally filled with bearing fluid and forming a reservoir for the bearing fluid.

14. A roller bearing according to claim 13, characterized in that the space (26; 126; 134; 324) is connected to the adjoining grooved pattern (24; 124; 132).

15. A roller bearing according to claim 11, characterized in that depending on its rotational direction and the design of the respective grooved pattern (124; 132), the first or the second fluid dynamic bearing becomes load bearing, while the bearing surface of the other bearing rest against each other.

16. A roller bearing according to claim 10, characterized in that the elastic element (18; 118; 218; 322; 418; 518; 618) or the annular component (320) is provided with at least one sealing ring (28) for sealing the respective fluid dynamic bearing.

17. A roller bearing according to claim 4, characterized in that the first and/or the second bearing is a roller bearing whose bearing surfaces are formed by the surfaces facing each other of a flange (220) of the elastic element (218) or of the annular component (320) respectively and the faces of the bearing rings.

18. A roller bearing according to claim 17, characterized in that roller members (224) are disposed on one of the bearing surfaces facing each other of the first and/or of the second bearing, the roller members rolling on the other bearing surface respectively.