Bearing assembly with inner ring

• US 8,616,777 B1
• Filed: 11/16/2012
• Issued: 12/31/2013
• Est. Priority Date: 11/16/2012
• Status: Active Grant

• Current Assignee: Pratt & Whitney Canada Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Pratt & Whitney Canada Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Smith, Alexander, Tam, Haw On
• Primary Examiner(s): Johnson, Phillip A
• Application Number:
  US13/678,803
• Time in Patent Office: 410 Days
• Field of Search: 384/462, 384473-475
• US Class Current: 384/475
• CPC Class Codes: F16C 19/26 with a single row of rollers
• CPC Class Codes: F16C 2360/23 Gas turbine engines in general F02C
• CPC Class Codes: F16C 33/586 outside the space between the races, e.g. end faces or bore of inner ring
• CPC Class Codes: F16C 33/6677 from radial inside, e.g. via a passage through the shaft and/or inner ring

Abstract

An inner ring for a bearing assembly with an inner surface having a plurality of circumferentially spaced axial slots defined therein each having a flat axially extending bottom wall and a plurality of circumferentially spaced partial circumferential slots defined therein each intersecting one of the axial slots and extending circumferentially therefrom around a respective portion of a circumference of the inner surface, shoulder radial holes extending therethrough each from a respective one of the circumferential slots to a corresponding one of the shoulders, and race radial holes extending therethrough each from a respective one of the circumferential slots to a corresponding corner of the inner race. The radial holes are circumferentially offset from the axial slots. A bearing assembly and a method of lubricating such an assembly are also discussed.

Claims

1. A bearing assembly comprising:

an outer ring having an inner surface including an outer race;

an inner ring concentric with and surrounded by the outer ring, the inner ring having

an outer surface including two axially spaced apart shoulders and an inner race defined between the shoulders, the inner race being complementary to the outer race, and

an inner surface having a plurality of circumferentially spaced axial slots with a flat bottom wall defined therein, the inner surface also having a plurality of circumferentially spaced partial circumferential slots defined therein each intersecting one of the axial slots and extending circumferentially therefrom, and

the inner ring further having shoulder radial holes extending therethrough each from a respective one of the circumferential slots to a corresponding one of the shoulders, and race radial holes extending therethrough each from a respective one of the circumferential slots to a corresponding corner of the inner race, the radial holes being circumferentially offset from the axial slots;

a cage member received between the outer and inner rings and abutting the shoulders of the inner ring; and

a plurality of bearing elements supported by the cage member and received between the outer race and the inner race, the bearing elements allowing relative rotational motion between the outer and inner rings.

2. The assembly as defined in claim 1, wherein the partial circumferential slots are separated into first, second, third and fourth sets axially offset from one another, the partial circumferential slots of the first and second sets being located near one end of the inner ring with the partial circumferential slots of the first set being closest to the one end, the partial circumferential slots of the third and fourth sets being located near the other end of the inner ring with the partial circumferential slots of the fourth set being closest to the other end, the partial circumferential slots of the first and fourth sets each receiving one of the shoulder radial holes, and the partial circumferential slots of the second and third sets each receiving one of the race radial holes.

3. The assembly as defined in claim 2, wherein the partial circumferential slots of different ones of the sets are staggered around the circumference of the inner ring.

4. The assembly as defined in claim 1, wherein each of the axial slots is intersected by a single one of the partial circumferential slots.

5. The assembly as defined in claim 1, wherein the radial holes include a same number of the shoulder radial holes and of the race radial holes.

6. The assembly as defined in claim 1, wherein the partial circumferential slots are regularly circumferentially spaced apart around the circumference of the inner surface.

7. The assembly as defined in claim 1, wherein the inner race includes a groove defined in each corner, and the race radial holes extend from the respective circumferential slot to the groove.

8. The assembly as defined in claim 1, wherein each of the partial circumferential slots has a depth greater than a depth of the axial slots.

9. The assembly as defined in claim 1, wherein each of the radial holes has a constant diameter along a complete length thereof.

10. An inner ring for a bearing assembly, the inner ring comprising:

an outer surface defining an inner race extending between two circumferential shoulders;

an inner surface concentric with the outer surface and located radially inwardly thereof, the inner surface having a plurality of circumferentially spaced axial slots defined therein each having a flat axially extending bottom wall, and a plurality of circumferentially spaced partial circumferential slots defined therein each intersecting one of the axial slots and extending circumferentially therefrom around a respective portion of a circumference of the inner surface;

the inner ring having shoulder radial holes extending therethrough each from a respective one of the circumferential slots to a corresponding one of the shoulders;

the inner ring having race radial holes extending therethrough each from a respective one of the circumferential slots to a corresponding corner of the inner race; and

the radial holes being circumferentially offset from the axial slots.

11. The inner ring as defined in claim 10, wherein the partial circumferential slots are separated into first, second, third and fourth sets axially offset from one another, the partial circumferential slots of the first and second sets being located near one end of the inner ring with the partial circumferential slots of the first set being closest to the one end, the partial circumferential slots of the third and fourth sets being located near the other end of the inner ring with the partial circumferential slots of the fourth set being closest to the other end, the partial circumferential slots of the first and fourth sets each receiving one of the shoulder radial holes, and the partial circumferential slots of the second and third sets each receiving one of the race radial holes.

12. The inner ring as defined in claim 11, wherein the partial circumferential slots of different ones of the sets are staggered around the circumference of the inner ring.

13. The inner ring as defined in claim 10, wherein each of the axial slots is intersected by a single one of the partial circumferential slots.

14. The inner ring as defined in claim 10, wherein the radial holes include a same number of the shoulder radial holes and of the race radial holes.

15. The inner ring as defined in claim 10, wherein the partial circumferential slots are regularly circumferentially spaced apart around the circumference of the inner surface.

16. The inner ring as defined in claim 10, wherein the inner race includes a groove defined in each corner, and the race radial holes extend from the respective circumferential slot to the groove.

17. The inner ring as defined in claim 10, wherein each of the partial circumferential slots has a depth greater than a depth of the axial slots.

18. The inner ring as defined in claim 10, wherein each of the radial holes has a constant diameter along a complete length thereof.

19. A method of lubricating a bearing assembly having a cage member retaining a plurality of bearing elements, the method comprising:

circulating a lubricating fluid axially along an inner surface of an inner ring of the bearing assembly following a plurality of distinct first paths;

circulating the lubricating fluid circumferentially from the first paths along the inner surface following a plurality of distinct second paths;

circulating the lubricating fluid radially from some of the second paths through the inner ring directly to shoulders defined in an outer surface of the inner ring and receiving the cage member; and

circulating the lubricating fluid radially from the remaining second paths through the inner ring directly to corners of an inner race defined in the outer surface and receiving the bearing elements.

20. The method of claim 19, wherein circulating the lubricating fluid axially includes circulating the lubricating fluid along a flat bottom surface of a plurality of axial slots defined in the inner surface.