Bearing assemblies, apparatuses, and motor assemblies using the same
Bearing assemblies, apparatuses, and motor assemblies using the same are disclosed. In an embodiment, a bearing assembly may include a plurality of superhard bearing elements distributed circumferentially about an axis. Each of the superhard bearing elements may include a bearing surface. The bearing assembly may also include a support ring structure having a support ring that carries the superhard bearing elements. The support ring structure may include at least one erosion resistant region exhibiting a higher erosion resistance than another region of the support ring.
1. A method of fabricating a bearing assembly, the method comprising:
providing a support ring that includes a plurality of recesses and/or an annular slot, the plurality of recesses and/or the annular slot extending from an upper surface of the support ring only partially through the support ring to a lower surface of the plurality of recesses and/or the annular slot;
mounting a plurality of superhard bearing elements to the support ring, each of the plurality of superhard bearing elements exhibiting a generally uniform cross-sectional width along a depth of the plurality of recesses and/or the annular slot from the upper surface to the lower surface; and
disposing at least one erosion resistant region on a portion of the support ring, the at least one erosion resistant region exhibiting an erosion resistance that is greater than the support ring;
wherein the at least one erosion resistant region is at least one of: formed only on as the upper surface of the support ring, positioned in the annular slot, or spaced from at least one adjacent superhard bearing element of the plurality of superhard bearing elements.
2. The method of claim 1 wherein:
the support ring includes the annular slot having a base surface and two opposing sidewalls; and
disposing at least one erosion resistant region on a portion of the support ring includes securing at least one erosion resistant insert in the annular slot.
3. The method of claim 1 wherein:
mounting the plurality of superhard bearing elements to the support ring includes disposing at least a portion of the plurality of superhard bearing elements in a corresponding one of the plurality of recesses; and
disposing at least one erosion resistant region on a portion of the support ring includes depositing an erosion resistant coating on the portion of the support ring.
4. The method of claim 3 wherein depositing an erosion resistant coating on the portion of the support ring is performed before mounting a plurality of superhard bearing elements to the support ring.
5. The method of claim 4 wherein depositing an erosion resistant coating on the portion of the support ring includes depositing the erosion resistant coating on at least one of the plurality of recesses.
6. The method of claim 3 wherein depositing an erosion resistant coating on the portion of the support ring is performed after mounting a plurality of superhard bearing elements to the support ring.
7. The method of claim 6 wherein depositing an erosion resistant coating on the portion of the support ring includes depositing the erosion resistant coating on a region of the support ring that is circumferentially between the plurality of superhard bearing elements and is spaced from at least one adjacent superhard bearing element of the plurality of superhard bearing elements by about 5 μm to about 6.4 mm.
8. The method of claim 6 , further comprising, before depositing an erosion resistant coating on the portion of the support ring, positioning protective cups over at least one of the plurality of superhard bearing elements.
9. The method of claim 3 wherein depositing an erosion resistant coating on the portion of the support ring includes depositing the erosion resistant coating by chemical vapor deposition.
10. The method of claim 3 wherein depositing an erosion resistant coating on the portion of the support ring includes depositing the erosion resistant coating by at least one of laser-deposition, physical vapor deposition, thermal spray deposition, or a high-velocity oxygen fuel thermal spray process.
11. The method of claim 3 wherein mounting a plurality of superhard bearing elements to the support ring includes brazing the plurality of superhard bearing elements to the support ring.
12. The method of claim 3 wherein depositing an erosion resistant coating on the portion of the support ring includes:
providing a preformed erosion resistant coating; and
brazing or welding the preformed erosion resistant coating to the portion of the support ring.
13. The method of claim 12 wherein brazing or welding the preformed erosion resistant coating to the portions of the support ring comprises welding the preformed erosion resistant coating to the portion of the support ring with tungsten inert gas welding, metal arc welding, or plasma transferred arc welding.
14. The method of claim 3 , further comprising, after depositing an erosion resistant coating on the portion of the support ring, machining the erosion resistant coating.
15. A method of fabricating a bearing assembly, the method comprising:
providing a support ring that includes a plurality of recesses, each of the plurality of recesses are defined by at least one recess surface, the plurality of recesses extending only partially through the support ring;
positioning a plurality of superhard bearing elements such that each of the plurality of superhard bearing elements is positioned in a corresponding one of the plurality of recesses of the support ring, each of the plurality of superhard bearing elements exhibiting a generally uniform transverse cross-sectional shape along a height of each of the plurality of superhard bearing elements; and
laser depositing at least one erosion resistant coating only on an upper surface of the support ring, the erosion resistant coating exhibiting an erosion resistance that is greater than the support ring and includes at least one of a superhard material, a metal carbide, or a cemented carbide.
16. The method of claim 15 wherein laser depositing an erosion resistant coating only on an upper surface of the support ring is performed before mounting a plurality of superhard bearing elements to the support ring.
17. The method of claim 15 wherein laser depositing an erosion resistant coating only on an upper surface of the support ring is performed after mounting a plurality of superhard bearing elements to the support ring.
18. The method of claim 17 wherein laser depositing an erosion resistant coating only on an upper surface of the support ring includes depositing the erosion resistant coating on a region of the support ring that is circumferentially between the plurality of superhard bearing elements and is spaced from the at least one adjacent superhard bearing element of the plurality of superhard bearing elements by about 5 μm to about 6.4 mm.
19. The method of claim 15 , further comprising brazing at least one of the plurality of superhard bearing elements to the support ring.
20. A method of fabricating a bearing assembly, the method comprising:
providing a support ring that includes a plurality of recesses;
positioning a plurality of superhard bearing elements such that each of the plurality of superhard bearing elements is positioned in a corresponding one of the plurality of recesses of the support ring, each of the plurality of superhard bearing elements exhibiting a generally uniform transverse cross-sectional shape along a height of each of the plurality of superhard bearing elements; and
forming at least one erosion resistant coating on a portion of the support ring so that the erosion resistant coating is spaced from at least one adjacent superhard bearing element of the plurality of superhard bearing elements by about 5 μm to about 6.4 mm;
wherein the erosion resistant coating exhibiting an erosion resistance that is greater than the support ring;
wherein the erosion resistant coating includes at least one of a superhard material, a metal carbide, or a cemented carbide.