Rolling bearing

Abstract

A rolling bearing, in particular a center-free large rolling bearing, having two concentric ball races with one ball race comprising a groove open toward the other ball race and the other ball race comprising a scraper ring engaging into the groove, wherein the scraper ring is supported at the groove in the axial direction of the rolling bearing by at least two axial bearings arranged at oppositely disposed scraper ring front sides and wherein the scraper ring is supported in the radial direction by at least one radial bearing which is arranged on a scraper ring jacket surface. The scraper ring is supported in the axial direction at the groove by a third axial bearing, wherein two axial bearings are arranged at the same side of the scraper ring at separate raceways offset from one another in the axial direction of the rolling bearing.

Claims

1. A rolling bearing having two concentric ball races, wherein a first ball race comprises a groove open toward a second ball race and the second ball race comprises a scraper ring engaging into the groove, wherein the scraper ring is supported at the groove in an axial direction of the rolling bearing by a first and a second axial bearing transversely arranged at oppositely disposed ends of a front side of the scraper ring and is supported in a radial direction of the rolling bearing by at least one radial bearing, wherein the scraper ring is supported at the groove in the axial direction by a third axial bearing arranged at an oppositely disposed front side of the scraper ring and positioned offset between the first and second axial bearings arranged at the front side of the scraper ring in two raceways offset from one another in the axial direction and without coverage of the third axial bearing.

2. The rolling bearing in accordance with claim 1, wherein an axial offset of the two raceways of the first and second axial bearings arranged at the front side of the scraper ring amounts to between 10% and 200% of a roller body diameter of the first and second axial bearings.

3. The rolling bearing in accordance with claim 2, wherein the axial offset of the two raceways is between 10% to 100%.

4. The rolling bearing in accordance with claim 2, wherein the axial offset of the two raceways is between 15% to 35%.

5. The rolling bearing in accordance with claim 1, wherein the first and second axial bearings arranged axially offset at the front side of the scraper ring each have a width which is smaller than a width of the third axial bearing arranged at the oppositely disposed front side of the scraper ring.

6. The rolling bearing in accordance with claim 1, wherein a sum of widths of the first and second axial bearings disposed at the front side of the scraper ring approximately corresponds to a width of the third axial bearing seated at the oppositely disposed front side of the scraper ring.

7. The rolling bearing in accordance with claim 1, wherein the scraper ring is supported in the radial direction at the groove by two radial bearings arranged at oppositely disposed jacket surface sides of the scraper ring.

8. The rolling bearing in accordance claim 7, wherein the two radial bearings are arranged, viewed in the radial direction, between the axial bearings arranged at the oppositely disposed front side of the scraper ring.

9. The rolling bearing in accordance with claim 7, wherein the two radial bearings cover one another, viewed in the radial direction, and are arranged in a common plane which is perpendicular to an axis of rotation of the rolling bearing.

10. The rolling bearing in accordance with claim 1, wherein the scraper ring is supported at the groove by exactly two radial bearings and by exactly three axial bearings; and/or the first and second ball races are supported with respect to one another by exactly two radial bearings arranged at oppositely disposed sides and by exactly three axial bearings arranged at oppositely disposed sides; wherein the exactly three axial bearings are comprised of the first, second, and third axial bearings.

11. The rolling bearing in accordance with claim 1, wherein the rolling bearing is a center-free large rolling bearing.

Description

BRIEF DESCRIPTION OF FIGURES

(1) FIG. 1 shows a longitudinal half-section of a center-free large rolling bearing in accordance with an advantageous embodiment of the invention in accordance with which the two ball races are supported by three axial bearings in the form of cylinder roller bearings and by two radial bearings likewise in the form of cylinder rolling bearings.

(2) FIG. 2 shows a longitudinal half-section through a center-free large rolling bearing in accordance with a further advantageous embodiment of the invention in which the two ball races are likewise supported by three axial bearings in the form of cylinder rolling bearings and by two radial bearings in the form of cylinder rolling bearings.

(3) FIG. 3 shows a longitudinal half-section through a center-free large rolling bearing in accordance with a further advantageous embodiment of the invention in which the two ball races are supported with respect to one another, in a similar manner to the embodiment of FIG. 1, by three axial bearings in the form of cylinder rolling bearings and by two radial bearings, with the one of the radial bearings being configured as a cylinder rolling bearing and the other radial bearing being configured as a ball bearing.

DETAILED DESCRIPTION

(4) As FIG. 1—and also the other Figures—show, the rolling bearing 1 can comprise two ball races 2 and 3 of which the one ball race 2 forms an inner race and the other ball race 3 forms an outer race. The named inner race 2 can have a smaller inner diameter than the outer race 3 and/or the outer race 3 can have a larger outer diameter than the named inner race 2.

(5) The one ball race 2, preferably the inner race, can have a groove 4 open to the other ball race 3, preferably to the outer race, and the other ball race 3 can engage by a scraper ring 5 provided thereat into it while forming a gap or with a spacing at all sides. The named groove 4 can in this respect advantageously engage around the scraper ring 4 from four sides, and indeed at two oppositely disposed jacket surface sides and at two oppositely disposed front surface sides of the named scraper ring 5.

(6) The named groove 4 can in this respect—in rough terms—comprise a U-shaped base contour in which the groove base is engaged around—at the right and at the left in accordance with FIG. 1—by two bearing race limbs. The named groove 4 can furthermore have a transversely projecting prolongation 4a at a side disposed opposite the groove base, said prolongation engaging around the scraper ring 5 at a side disposed opposite the groove base at the front side. The named groove 4 can be undercut overall. To be able to set the scraper ring 5 into the named groove 4, the ball race 2 having the groove 4 can be composed of a support race 6 and a holding race 7 which can be set thereon, cf. FIGS. 1, 2 and 3.

(7) The named scraper ring 5 is supported with respect to the groove 4 by three axial bearings 8, 9 and 10 and by two radial bearings 11 and 12. In this respect, two of the named axial bearings 8 and 9 can be arranged at the same front side of the scraper ring—at the bottom in accordance with FIG. 1—and the third axial bearing 10 can be arranged at the oppositely disposed front side of the scraper ring. The radial bearings 11 and 12 can also be arranged at oppositely disposed sides, namely at oppositely disposed jacket surface sides of the named scraper ring 5 such that the scraper ring 5 is sandwiched or is supported both in that axial direction and in the radial direction between bearings located at oppositely disposed sides. The scraper ring 5 is supported at the groove 4 at all sides.

(8) As FIG. 1 shows, the two axial bearings 8 and 9 provided at the same front side of the scraper ring are not only spaced apart from one another in the radial direction and at different raceways 15 and 16, but are also arranged offset from one another in the axial direction—i.e. in the direction of the arrow 13—such that the two axial bearings 8 and 9 are not at the same level.

(9) The axial offset 14 can in this respect advantageously amount to approximately 15 to 35%, in particular to approximately 20%, of the diameter D of the roller bodies of the named axial bearings 8 and 9.

(10) The axial bearings 8 and 9 arranged at the same front side of the scraper ring can in this respect have a width B—measured in the radial direction—which is respectively smaller than the width of the axial bearing 10 arranged at the oppositely disposed front side of the scraper ring, with the sum of the two widths of the two axial bearings 8 and 9 being able to correspond approximately to the width of the named other axial bearing 10.

(11) The two axial bearings 8 and 9 can be positioned at the same front side of the scraper ring such that the one axial bearing 9 is covered, viewed in the axial direction, by the axial bearing 10 disposed at the oppositely disposed front side of the scraper ring, whereas the other axial bearing 8 does not show any such coverage.

(12) The two radial bearings 11 and 12 can be arranged disposed opposite one another. Independently of this, it can be advantageous for the two radial bearings 11 and 12 to be arranged between the axial bearings 8, 9 and 10, cf. FIG. 1.

(13) As FIG. 1 shows, both the axial bearings 8, 9 and 10 and the radial bearings 11 and 12 can each be configured as cylinder rolling bearings.

(14) The rolling bearing shown in FIG. 2 corresponds to the embodiment in accordance with FIG. 1 with respect to a number of feature complexes, in particular with respect to the arrangement of the radial bearings 11 and 12 and substantially differs from the embodiment of FIG. 1 by the arrangement of the axial bearings. In FIG. 2, the axial bearings 8 and 9 arranged at the same front side of the scraper ring are also offset with respect to one another in the axial direction. However, the arrangement of these two axial bearings 8 and 9 is made in this respect such they are not covered by the axial bearing 10, viewed in the axial direction, at the oppositely disposed front side of the scraper ring. The named axial bearing 10 disposed on the oppositely disposed front side of the scraper ring is arranged, viewed in the axial direction, between the two axial bearings 8 and 9 disposed at the same front side of the scraper ring.

(15) Furthermore, as FIG. 2 shows, provision can be made that the two axial bearings 8 and 9 disposed at the same front side are supported at the holding race 7, whereas the third axial bearing 10 is supported at the oppositely disposed front side of the scraper ring at the support race 6. Independently of this, the two axial bearings 8 and 9 disposed at the same front side of the scraper ring can be supported at oppositely disposed jacket surface sides of the ball race 3, in particular at corresponding steps in the contour at the jacket surface side.

(16) To the extent that the embodiment in accordance with FIG. 2 corresponds to the embodiment in accordance with FIG. 1, reference can be made to the preceding description.

(17) As FIG. 3 shows, different rolling body types can also advantageously be used. The two radial bearings 11 and 12 can in particular have different roller body geometries, with one of the radial bearings 11 in particular being able to be configured as a cylinder rolling bearing and the other radial bearing 12 as a ball bearing. The arrangement can in this respect advantageously be made such that the radial cylinder rolling bearing is arranged at the inner side and the radial ball bearing is arranged at the outer side of the scraper ring 5, cf. FIG. 3.

(18) To the extent that the embodiment in accordance with FIG. 3 likewise corresponds to the embodiment in accordance with FIG. 1, reference can likewise be made to the previous description. Furthermore, the named radial bearing design can also be implemented with different roller body geometries, but also in a rolling bearing arrangement in accordance with FIG. 2 so that reference can in this respect also be made to the previous description.