Bearing assemblies, apparatuses, and related methods of manufacture
View Patent ↗In an embodiment, a bearing assembly may include a support ring to which one or more superhard bearing elements may be mounted. The support ring may include one or more relief features configured to reduce residual stresses in the superhard bearing elements that are induced by brazing the superhard bearing elements to the support ring, operational loads, other processes, or combinations of the foregoing. Reducing the residual stresses in the superhard bearing elements may help prevent damage to the superhard bearing elements. The bearing assembly may be used in subterranean drilling systems and/or other types of systems.
1. A bearing assembly for use in a subterranean drilling system, the bearing assembly comprising:
a plurality of superhard bearing elements; and
a support ring including:
a plurality of recesses distributed circumferentially about a rotation axis, wherein a corresponding one of the plurality of superhard bearing elements is affixed to the support ring in a corresponding one of the plurality of recesses; and
a plurality of relief features formed in the support ring including two closed ends that are bounded by the support ring, each of the plurality of relief features disposed between adjacent recesses of the plurality of recesses.
2. The bearing assembly of claim 1 wherein the plurality of relief features are configured to reduce residual stresses in the plurality of superhard bearing elements caused by brazing the plurality of superhard bearing elements to the support ring.
3. The bearing assembly of claim 1 wherein the plurality of superhard bearing elements are substantially equidistantly spaced apart.
4. The bearing assembly of claim 1 wherein at least a portion of the plurality of superhard bearing elements comprises polycrystalline diamond compacts.
5. The bearing assembly of claim 1 wherein the plurality of relief features comprises a plurality of grooves formed in the support ring.
6. The bearing assembly of claim 5 wherein each of the plurality of grooves is disposed between adjacent recesses of the plurality of recesses of the support ring.
7. The bearing assembly of claim 5 wherein each of the plurality of grooves is disposed circumferentially about halfway between adjacent recesses of the plurality of recesses of the support ring.
8. The bearing assembly of claim 5 wherein the plurality of grooves are substantially equidistantly spaced apart.
9. The bearing assembly of claim 5 wherein the plurality of grooves are formed in a section of a wall of the support ring, and wherein a maximum depth of at least one of the plurality of grooves is about thirty (30) percent to about ninety (90) percent of a maximum thickness of the support ring.
10. The bearing assembly of claim 9 wherein the maximum depth of the at least one of the plurality of grooves is about forty (40) percent to about eighty (80) percent of the maximum thickness of the support ring.
11. The bearing assembly of claim 9 wherein the maximum depth of the at least one of the plurality of grooves is about fifty (50) percent to about seventy (70) percent of the maximum thickness of the support ring.
12. The bearing assembly of claim 9 wherein the maximum depth of the at least one of the plurality of grooves is about fifty-five (55) percent to about sixty-five (65) percent of the maximum thickness of the support ring.
13. The bearing assembly of claim 9 wherein the maximum depth of the at least one of the plurality of grooves is about forty (40) percent to about eighty (80) percent of the maximum thickness of the support ring.
14. The bearing assembly of claim 5 wherein a maximum width of at least one of the plurality of grooves is about ten (10) percent to about thirty (30) percent of a maximum width of at least one of the plurality of recesses.
15. The bearing assembly of claim 14 wherein a maximum length of at least one of the plurality of grooves is about fifteen (15) percent to about twenty-five (25) percent of the maximum width of the at least one of the plurality of recesses.
16. The bearing assembly of claim 14 wherein a maximum length of at least one of the plurality of grooves is about one hundred (100) percent to about one hundred and forty (140) percent of the maximum width of the at least one of the plurality of recesses.
17. The bearing assembly of claim 5 wherein a maximum length of at least one of the plurality of grooves is at least about one hundred and twenty (120) percent of the maximum width of the at least one of the plurality of recesses.
18. The bearing assembly of claim 5 wherein at least some of the plurality of grooves extends entirely through a thickness of the support ring.
19. The bearing assembly of claim 1 wherein each of the superhard bearing elements comprises a superhard bearing surface that is substantially free of radially-extending cracks.
20. A bearing apparatus for use in a subterranean drilling system, the bearing apparatus comprising:
a first bearing assembly including:
a plurality of first superhard bearing elements each of which includes a first bearing surface; and
a support ring including:
a plurality of recesses distributed circumferentially about a rotation axis, wherein a corresponding one of the plurality of first superhard bearing elements that is affixed to the support ring in a corresponding one of the plurality of recesses; and
a plurality of relief features formed in the support ring including two closed ends that are bounded by the support ring, each of the plurality of relief features disposed between adjacent recesses of the plurality of recesses; and
a second bearing assembly including a plurality of second superhard bearing elements each of which includes a second bearing surface generally opposing the first bearing surfaces of the plurality of first superhard bearing elements.
21. The bearing apparatus of claim 20 wherein the plurality of relief features are configured to reduce residual stresses in the plurality of first superhard bearing elements caused by brazing the plurality of first superhard bearing elements to the support ring.
22. The bearing apparatus of claim 20 wherein the first and second bearing assemblies are each radial bearing assemblies.
23. The bearing apparatus of claim 20 wherein the first and second bearing assemblies are each thrust-bearing assemblies.
24. A method for manufacturing a bearing assembly for use in a subterranean drilling system, the method comprising:
providing a support ring including:
a plurality of recesses distributed circumferentially about an axis; and
a plurality of relief features formed in the support ring including two closed ends that are bounded by the support ring, each of the plurality of relief features disposed between adjacent recesses of the plurality of recesses; and
brazing a plurality of superhard bearing elements to the support ring, with each of the plurality of superhard bearing elements disposed in a corresponding one of the plurality of recesses.
25. The method of claim 24 wherein brazing a plurality of superhard bearing elements to the support ring comprises brazing the plurality of superhard bearing elements to the support ring without forming radial cracks in at least one of the plurality of superhard bearing elements.