Bearing sump with bi-directional stiffness

1. A bearing sump, comprising:

an annular housing having a first axial length that is substantially equivalent to an axial length of the bearing sump;

an annular bearing support disposed concentrically within the annular housing and having a second axial length that is less than about 50% of the first axial length;

an annular space between the housing and the bearing support;

first and second axial ribs in the form of annular segments having a central angle of less than about 60 degrees and connecting with both the housing and the bearing support; and

an end ring disposed concentrically and abuttingly within the housing and having a third axial length that is less than about 50% of the first axial length, wherein each of the first and second axial ribs form a portion of the end ring.

2. The bearing sump of claim 1 , wherein the bearing support is configured to receive an annular bearing for providing vibration damping thereto.

3. The bearing sump of claim 1 , wherein the housing, the bearing support, and the first and second axial ribs form an integral structure.

4. The bearing sump of claim 1 , wherein a sum of a radial thickness of the housing plus a radial thickness of the end ring is substantially equivalent to a radial thickness of the first and second axial ribs.

5. The bearing sump of claim 1 , wherein the end ring is disposed along a first axial end of the bearing support that is adjacent to a constrained aft plane and wherein the bearing support is disposed along a second axial end of the bearing support opposite the first axial end.

6. The bearing sump of claim 5 , wherein a sum of the second and third axial lengths is less than the first axial length, and wherein a void is disposed between the end ring and the bearing support.

7. The bearing sump of claim 6 , wherein the void and the annular space are connected to one another so as to allow oil to drain from the bearing sump.

8. The bearing sump of claim 1 , wherein a sum of a radial thickness of the housing plus a radial thickness of the annular space plus a radial thickness of the bearing support is substantially equivalent to a radial thickness of the first and second axial ribs.

9. The bearing sump of claim 8 , wherein the radial thickness of the bearing support divided by the radial thickness of the housing is about 2.

10. The bearing sump of claim 1 , wherein an axial length of the first and second axial ribs is substantially equivalent to the first axial length.

11. A bearing sump for damping non-synchronous vibration, comprising:

an annular housing having a first axial length that is substantially equivalent to an axial length of the bearing sump;

an annular bearing support disposed concentrically within the annular housing and having a second axial length that is less than about 50% of the first axial length;

an annular space between the housing and the bearing support;

first and second axial ribs in the form of annular segments having a central angle of less than about 60 degrees and connecting with both the housing and the bearing support;

an end ring disposed concentrically and abuttingly within the housing and having a third axial length that is less than about 50% of the first axial length,

wherein the end ring is disposed along a first axial end of the bearing support that is adjacent to a constrained aft plane and wherein the bearing support is disposed along a second axial end of the bearing support opposite the first axial end,

wherein the sum of the second and third axial lengths is less than the first axial length, and wherein a void is disposed between the end ring and the bearing support,

wherein the bearing support is configured to receive an annular bearing for providing vibration damping thereto,

wherein the housing, the bearing support, and the first and second axial ribs form an integral structure, and

wherein the bearing support has a radial thickness that is greater than or equal to a radial thickness of the housing.

12. A bearing sump, comprising:

an annular housing having a first axial length that is substantially equivalent to an axial length of the bearing sump;

an annular bearing support disposed concentrically within the annular housing and having a second axial length that is less than about 50% of the first axial length;

an annular space between the housing and the bearing support;

first and second axial ribs in the form of annular segments having a central angle of less than about 60 degrees and connecting with both the housing and the bearing support; and

an end ring disposed concentrically and abuttingly within the housing and having a third axial length that is less than about 50% of the first axial length, wherein a sum of a radial thickness of the housing plus a radial thickness of the end ring is substantially equivalent to a radial thickness of the first and second axial ribs.

13. The bearing sump of claim 12 , wherein the end ring is disposed along a first axial end of the bearing support that is adjacent to a constrained aft plane and wherein the bearing support is disposed along a second axial end of the bearing support opposite the first axial end.

14. The bearing sump of claim 13 , wherein a sum of the second and third axial lengths is less than the first axial length, and wherein a void is disposed between the end ring and the bearing support.

15. The bearing sump of claim 14 , wherein the void and the annular space are connected to one another so as to allow oil to drain from the bearing sump.

16. The bearing sump of claim 12 , wherein a sum of a radial thickness of the housing plus a radial thickness of the annular space plus a radial thickness of the bearing support is substantially equivalent to a radial thickness of the first and second axial ribs.

17. The bearing sump of claim 16 , wherein the radial thickness of the bearing support divided by the radial thickness of the housing is about 2.

18. The bearing sump of claim 12 , wherein an axial length of the first and second axial ribs is substantially equivalent to the first axial length.