Patent US3894818A successfully refreshed from Google Patents.
US3894818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-hole motors
Assignee: Smith International Inc
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Filing: 1973-04-27
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Granted: 1975-07-15
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Expires: 1993-04-27
Abstract
Abstract This invention relates to in-hole motors in which thrust bearings are provided with means to lubricate the bearings employing pressure balanced seals. The preferred embodiment includes the application of such sealed bearings to progressing cavity motors for use in drilling operations.
Inventors
- 👤 John E Tschirky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:47
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; E21B23/00; E21B23/04; E21B23/0419; E21B4/003; F; F03; F03C; F03C2/00; F03C2/08; F16; F16C; F16C19/00; F16C19/02; F16C19/10; F16C19/54; F16C41/00; F16C41/02; F16J; F16J15/00; F16J15/16; F16J15/18; F16C2352/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
A fluid motor, comprising a stator, a rotor in said stator, a tubular drive shaft connected to said rotor, a housing for said drive shaft, a port in said tubular drive shaft, a first fluid passageway into the stator, an outlet from said stator connected to the interior of said tubular drive shaft through said port, a discharge opening from said shaft, a lubrication reservoir chamber in said housing between said outlet and said discharge opening, a bearing between said shaft and said housing lubrication passageways in said housing connecting said reservoir chamber and the interior of said housing at said bearing, a seal mounted in sealing relation between said housing and said shaft, said seal positioned in said housing between said stator outlet and said bearing, a second fluid passageway being positioned in said housing, one end of said seal communicating with said stator outlet through said second fluid passageway means to maintain the pressure in said reservoir and at said seal, in the passageway between stator outlet and said seal, and at said discharge opening substantially equal.
Claim 2
Dependent Claim
179 words
A fluid motor, comprising a stator, a rotor in said stator, a tubular drive shaft connected to said rotor, a housing for said drive shaft, a port in said tubular drive shaft, a first fluid passageway into the stator, an outlet from said stator connected to the interior of said tubular drive shaft through said port, a discharge opening from said shaft, a lubrication reservoir chamber in said housing between said outlet and said discharge opening, a bearing between said shaft and said housing lubrication passageways in said housing connecting said reservoir chamber and the interior of said housing at said bearing, a seal mounted in sealing relation between said housing and said shaft, said seal positioned in said housing between said stator outlet and said bearing, a second fluid passageway being positioned in said housing, one end of said seal communicating with said stator outlet through said second fluid passageway means to maintain the pressure in said reservoir and at said seal, in the passageway between stator outlet and said seal, and at said discharge opening substantially equal.
Claim 3
Dependent Claim
31 words
The motor of claim 1, said bearing being a thrust bearing assembly mounted on said housing and on said shaft in thrust load transmission relationship between said shaft and said housing.
Claim 4
Dependent Claim
88 words
The motor of claim 2, a second seal positioned adjacent the end of the housing adjacent said shaft discharge in sealing relation between said shaft and said housing, a second bearing assembly spaced from such first-mentioned bearing assembly and mounted on said shaft and on said housing in thrust load transmission relationship between said housing and said shaft, said second bearing being positioned in said housing between the said reservoir and the said second seal, lubricating passageways between said reservoir and the housing at said second thrust bearing.
Claim 5
Dependent Claim
40 words
The fluid motor of claim 1, said means including a bore positioned in said housing adjacent said second fluid passageway, a bellows mounted in said reservoir chamber, a passageway through said housing in communication with the interior of said bellows.
Claim 6
Dependent Claim
31 words
The motor of claim 4, said bearing being a thrust bearing assembly mounted on said housing and on said shaft in thrust load transmission relationship from said shaft to said housing.
Claim 7
Dependent Claim
88 words
The motor of claim 5, a second seal positioned adjacent the end of the housing adjacent said shaft discharge in sealing relation between said shaft and said housing, a second bearing assembly spaced from such first-mentioned bearing assembly and mounted on said shaft and on said housing in thrust load transmission relation between said housing and said shaft, said second bearing being positioned in said housing between the said reservoir and the said second seal, lubricating passageways between said reservoir and the housing at said second thrust bearing.
Claim 8
Dependent Claim
13 words
The motor of claim 1, said second fluid passageway being a restricted passageway.
Claim 9
Dependent Claim
32 words
In the motor of claim 1, said bearing being a thrust bearing assembly mounted on said housing and on said shaft in thrust load transmission relationship from said shaft to said housing.
Claim 10
Dependent Claim
88 words
The motor of claim 8, a second seal positioned adjacent the end of the housing adjacent said shaft discharge in sealing relation between said shaft and said housing, a second bearing assembly spaced From such first-mentioned bearing assembly and mounted on said shaft and on said housing in thrust load transmission relationship between said housing and said shaft, said second bearing being positioned in said housing between the said reservoir and the said second seal, lubricating passageways between said reservoir and the housing at said second thrust bearing.
Claim 11
Dependent Claim
46 words
The fluid motor of claim 7, said means including a bore positioned in said housing adjacent said second fluid passageway and the exterior of said housing, a bellows mounted in said reservoir chamber, a passageway through said housing in communication with the interior of said bellows.
Claim 12
Dependent Claim
31 words
The motor of claim 10, said bearing being a thrust bearing assembly mounted on said housing and on said shaft in thrust load transmission relationship from said shaft to said housing.
Claim 13
Dependent Claim
88 words
The motor of claim 11, a second seal positioned adjacent the end of the housing adjacent said shaft discharge in sealing relation between said shaft and said housing, a second bearing assembly spaced from such first-mentioned bearing assembly and mounted on said shaft and on said housing in thrust load transmission relation between said housing and said shaft, said second bearing being positioned in said housing between the said reservoir and the said second seal, lubricating passageways between said reservoir and the housing at said second thrust bearing.
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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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |