High-speed anti-friction bearing particularly for airplane power plants

• US 4,797,014 A
• Filed: 01/19/1988
• Issued: 01/10/1989
• Est. Priority Date: 08/27/1987
• Status: Expired due to Fees

• Current Assignee: FAG Kugelfischer Georg Schafer & Company
• Original Assignee: FAG Kugelfischer Georg Schafer & Company
• Inventors: Nicolich, Patrick
• Primary Examiner(s): Levy, Stuart S.
• Assistant Examiner(s): Hannon, Thomas R.
• Application Number:
  US07/145,519
• Time in Patent Office: 357 Days
• Field of Search: 384/462, 384/475, 384/490, 384/499, 384/505, 384/506, 384/513, 384/515, 384/523, 384/564, 384/569, 384/570, 384/627
• US Class Current: 384/490
• CPC Class Codes: F01D 25/16 Arrangement of bearings; Supporting or mounting bearings in casings bearings per se F16C
• CPC Class Codes: F16C 19/06 with a single row or balls
• CPC Class Codes: F16C 19/10 for axial load mainly
• CPC Class Codes: F16C 2360/23 Gas turbine engines
• CPC Class Codes: F16C 33/32 Balls
• CPC Class Codes: F16C 33/38 Ball cages
• CPC Class Codes: F16C 33/58 Raceways; Race rings
• CPC Class Codes: F16C 33/60 divided or split, e.g. comprising two juxtaposed rings
• CPC Class Codes: F16C 33/6677 from radial inside, e.g. via a passage through the shaft and/or inner ring
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A high-spped anti-friction bearing particularly useful for airplane power plants, the bearing having an outer ring and an inner ring. The inner ring is axially split at the rolling elements into two axial sections. The axial sections are each generally L-shaped in cross section, with one arm of each L backed against the other. To enable the bearing rings to be relatively thin walled in the radial direction and to prevent undesirable deformation thereof during the manufacture or installation, each of the rings is provided on at least one axial side and preferably on both axial sides with projecting axial extensions. Each extension preferably tapers narrower in its radial thickness axially outward. Each extension includes a cylindrical portion and a frustoconically shaped portion, usually with the cylindrical portion axially more inward and the frustoconical portion axially more outward. The cage for the rolling elements also has axial extensions at one or both sides and comprised of a cylindrical portion followed axially outward by a frustoconical portion.

Claims

1. A high-speed anti-friction bearing comprising an outer ring, an inner ring inward of and spaced from the outer ring, and the rings defining races for rolling elements moving between the rings;

rolling elements supported in the races of the rings;

at at least one axial side of the bearing, axially outward of the rolling elements at that one axial side, the inner ring and the outer ring are both provided with respective axial extensions projecting axially outward for strengthening the rings against deformation;

each axial extension comprises a generally cylindrically shaped portion and connected thereto an annular portion which is inclined at an angle from the cylindrical portion for generally defining a frustoconical portion.

2. The bearing of claim 1, wherein at both axial sides of the bearing on both the inner and the outer rings, axially outward of the rolling elements, respective ones of the axial extensions are defined.

3. The bearing of claim 2, wherein at least one of the rings is axially split, generally at the axial location of the rolling elements, whereby that ring is in two axial sections.

4. The bearing of claim 3, wherein each of the axial sections of the split ring is, in cross-section, generally of L-shape, with a first arm of each L-shape section extending axially outwardly and having a free-end defining the axial extensions, and with a second arm of the section extending radially, and the second arms of both of the axial sections being adjacent.

5. The bearing of claim 4, wherein the inner ring is the ring that is axially split.

6. The bearing of claim 4, wherein the second arms of the axial sections are shaped to together define a circumferential slot between the second arms, and the circumferential slot communicates to the races for the rolling elements.

7. The bearing of claim 6, further comprising a lubricating oil feed hole communicating through one of the axial sections to the slot.

8. The bearing of claim 3, wherein the axial sections are shaped to together define a circumferential slot between the axial sections and the circumferential slot communicates to the races for the rolling elements.

9. The bearing of claim 2, wherein at least some of the axial extensions taper narrower in radial thickness axially outward toward the free ends of the extensions.

10. The bearing of claim 2, wherein the rolling elements are comprised of a ceramic material.

11. The bearing of claim 10, wherein the rolling elements are comprised of silicon nitride.

12. The bearing of claim 11, wherein the rolling elements are balls.

13. The bearing of claim 2, wherein the rolling elements are balls.

14. The bearing of claim 1, wherein the inclined frustoconical portion of the axial extensions inclined at an angle of about 45°

from the axis of the bearing.

15. The bearing of claim 1, wherein at least some of the axial extensions taper narrower in radial thickness axially outward toward the free ends of the extensions.

16. The bearing of claim 1, further comprising a housing around the bearing, at least some of the axial extensions from the rings extending freely into space for avoiding resting against the bearing housing.

17. The bearing of claim 1, further comprising a cage between the rings, the cage including means spacing and separating the rolling elements.

18. The bearing of claim 17, wherein at at least one axial side of the cage, a cage axial extension projects from the cage and extends axially beyond the rolling elements, the cage axial extension comprises a generally cylindrically shaped portion and an annular, inclined, frustoconical portion axially next to the cylindrical portion.

19. The bearing of claim 18, wherein there is a respective cage axial extension projecting from both axial sides of the cage.

20. The bearing of claim 19, wherein at at least most of the axial extensions of the rings and the cage, the cylindrical portion is followed axially outward by the frustoconical, portion.