Patent US5364192A successfully refreshed from Google Patents.
US5364192A
Expired / Lapsed
US
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Diamond bearing assembly
Assignee: Individual
•
Filing: 1993-10-28
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Granted: 1994-11-15
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Expires: 2013-10-28
Abstract
Abstract The invention concerns a diamond thrust bearing assembly for a downhole motor. The assembly (10) includes at least one set of opposing bearing rings (20, 22), each of which has an annular support element (24, 30) and a plurality of PCD compacts (48, 62) carried in circumferentially spaced relationship by the support element. The PCD compacts present opposing bearing surfaces (52, 66) with the bearing surfaces (66) of the compacts of one bearing ring in each set being circumferentially longer than the bearing surfaces (52) of the compacts of the other bearing ring of the set.
Inventors
- 👤 Oliver F. R. A. Damm
- 👤 Klaus Tank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:56
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/26; E; E21; E21B; E21B4/00; E21B4/003; F16C17/00; F16C17/04; F16C33/043; F16C2206/00; F16C2206/02; F16C2206/04; F16C2352/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A diamond thrust bearing assembly for a downhole motor, the assembly comprising at least one set of opposing bearing rings, each bearing ring comprising an annular support element and a plurality of PCD compacts carried in circumferentially spaced relationship by the support element, the PCD compacts presenting opposing bearing surfaces with the bearing surfaces of the compacts of one bearing ring in each set being circumferentially longer than the bearing surfaces of the compacts of the other bearing ring of the set.
Claim 2
Dependent Claim
82 words
A diamond thrust bearing assembly for a downhole motor, the assembly comprising at least one set of opposing bearing rings, each bearing ring comprising an annular support element and a plurality of PCD compacts carried in circumferentially spaced relationship by the support element, the PCD compacts presenting opposing bearing surfaces with the bearing surfaces of the compacts of one bearing ring in each set being circumferentially longer than the bearing surfaces of the compacts of the other bearing ring of the set.
Claim 3
Dependent Claim
24 words
A diamond thrust bearing assembly according to claim 1 wherein the PCD compacts are provided by composite PCD compacts secured to the bearing rings.
Claim 4
Dependent Claim
44 words
A diamond thrust bearing assembly according to claim 2 wherein the composite PCD compacts of one bearing ring in each set are of round cylindrical form, and the composite PCD compacts of the other bearing ring in the set are of elongate, part-annular shape.
Claim 5
Dependent Claim
30 words
A diamond thrust bearing assembly according to claim 3 wherein the circumferential length of each part-annular composite compact is substantially greater than the diameter of a round cylindrical composite compact.
Claim 6
Dependent Claim
58 words
A diamond thrust bearing assembly according to claim 4 wherein the arrangement of composite compacts in the respective bearing rings is such that the bearing surface of at least one round cylindrical compact always bears fully against the bearing surface of a part-annular composite compact, irrespective of the rotational position of the bearing rings relative to one another.
Claim 7
Dependent Claim
38 words
A diamond thrust bearing assembly according to claim 3 wherein the composite compacts are secured in pockets in their respective annular support elements, the part-annular composite compacts projecting further from their pockets than the round cylindrical composite compacts.
Claim 8
Dependent Claim
25 words
A diamond thrust bearing assembly according to claim 6 wherein there are, on each bearing ring, circumferential gaps between the composite compacts of that ring.
Claim 9
Dependent Claim
23 words
A diamond thrust bearing assembly according to claim 3 wherein each PCD compact has a flat bearing surface circumscribed by a chamfered edge.
Claim 10
Dependent Claim
35 words
A diamond thrust bearing assembly according to claim 8 wherein the chamfered edge of each compact includes a shallow chamfer making an angle of less than 45° with the flat bearing surface of the compact.
Claim 11
Dependent Claim
28 words
A diamond thrust bearing assembly according to claim 9 wherein the shallow chamfer makes an angle of 1° to 10° with the flat bearing surface of the compact.
Claim 12
Dependent Claim
27 words
A diamond thrust bearing assembly according to claim 10 wherein the shallow chamfer makes an angle of about 5° with the flat bearing surface of the compact.
Claim 13
Dependent Claim
17 words
A diamond thrust bearing assembly according to claim 9 wherein the shallow chamfer is curved in cross-section.
Claim 14
Dependent Claim
36 words
A diamond thrust bearing assembly according to claim 9 wherein the chamfered edge includes, located outwardly of the shallow chamfer, a further chamfer making a steeper angle with the flat bearing surface than the shallow chamfer.
Claim 15
Dependent Claim
19 words
A diamond thrust bearing assembly according to claim 13 wherein the further chamfer has a curved shape in cross-section.
Claim 16
Dependent Claim
19 words
A diamond thrust bearing assembly according to claim 3 wherein each support element is made of sintered tungsten carbide.
Claim 17
Dependent Claim
17 words
A diamond thrust bearing assembly according to claim 15 and comprising two sets of opposing bearing rings.
Claim 18
Dependent Claim
56 words
A diamond thrust bearing assembly according to claim 16 wherein PCD compacts with circumferentially longer bearing surfaces are carried by support elements adapted to be mounted on a rotatable driveshaft of the downhole motor while PCD compacts with circumferentially shorter bearing surfaces are carried by support elements adapted to be mounted on a stationary bearing housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-14 | 1998-05-16 | 1998-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-14 | 2002-05-16 | 2002-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-14 | 2006-05-16 | 2006-11-15 | $7700.00 | Window Closed / Lapsed |