Patent US3935704A successfully refreshed from Google Patents.
US3935704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan propulsor oil escapement means
Assignee: RTX Corp
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Filing: 1974-09-12
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Granted: 1976-02-03
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Expires: 1994-09-12
Abstract
Abstract This invention cures the problem attendant the ingestion of oil in the engine of a fan-turbine engine combustion propulsor should oil leak from the fan blade seal by capturing and judiciously venting the leakage.
Inventors
- 👤 Philip E. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:44
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/083; F01; F01D; F01D25/00; F01D25/18; F01D25/32; F04D29/06; F04D29/063; F04D29/26; F04D29/32; F04D29/321; F04D29/322; F04D29/323; F04D29/34; F04D29/36; F04D29/362
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
In a ducted fan propulsor having a plurality of fan blades disposed upstream of a gas turbine engine, each of said fan blades having an inner section including a shank in proximity to the inlet of said gas turbine engine and an outer section in proximity to an engine bypass duct, said shank being mounted in a recess in a hub, an improvement for capturing oil escaping from said hub recess which comprises an annularly grooved portion on said blade inner section spaced longitudinally outwardly from said hub recess with said annular groove overlying said hub recess and passage means extending from said groove to said blade outer portion for venting oil collected in said annular groove to said bypass duct.
Claim 2
Dependent Claim
121 words
In a ducted fan propulsor having a plurality of fan blades disposed upstream of a gas turbine engine, each of said fan blades having an inner section including a shank in proximity to the inlet of said gas turbine engine and an outer section in proximity to an engine bypass duct, said shank being mounted in a recess in a hub, an improvement for capturing oil escaping from said hub recess which comprises an annularly grooved portion on said blade inner section spaced longitudinally outwardly from said hub recess with said annular groove overlying said hub recess and passage means extending from said groove to said blade outer portion for venting oil collected in said annular groove to said bypass duct.
Claim 3
Dependent Claim
122 words
In a ducted fan propulsor having a plurality of fan blades disposed upstream of a gas turbine engine, each of said fan blades having an inner portion including a shank in proximity to the inlet of said gas turbine engine and an outer portion in proximity to an engine bypass duct, said shank being mounted in a recess in a hub, an improvement for capturing oil escaping from said hub recess which comprises an enlarged diameter portion on said shank spaced longitudinally outwardly from said hub recess and having an annular recess therein overlying said hub recess and passage means extending from said annular recess to said blade outer portion for venting oil collected in said annular recess to said bypass duct.
Claim 4
Dependent Claim
122 words
In a ducted fan propulsor having a plurality of fan blades disposed upstream of a gas turbine engine, each of said fan blades having an inner portion including a shank in proximity to the inlet of said gas turbine engine and an outer portion in proximity to an engine bypass duct, said shank being mounted in a recess in a hub, an improvement for capturing oil escaping from said hub recess which comprises an enlarged diameter portion on said shank spaced longitudinally outwardly from said hub recess and having an annular recess therein overlying said hub recess and passage means extending from said annular recess to said blade outer portion for venting oil collected in said annular recess to said bypass duct.
Claim 5
Dependent Claim
20 words
Means for capturing oil as claimed in claim 2 including ball bearings supporting said blade shank for blade angle movement.
Claim 6
Dependent Claim
22 words
Means for capturing oil as claimed in claim 3 including sealing means adjacent said hub recess outboard relative to said ball bearings.
Claim 7
Dependent Claim
19 words
Means as claimed in claim 2 wherein said passage means is a passageway formed generally longitudinally in said blade.
Claim 8
Dependent Claim
13 words
Means as claimed in claim 2 wherein said passage means is a tube.
References Cited (Backward Citations)
US2230708A
Cited
US3866415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |