Patent US1925216A successfully refreshed from Google Patents.
Patent US3754484A successfully refreshed from Google Patents.
US3754484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gearing
Assignee: UK Secretary of State for Defence
•
Filing: 1972-01-03
•
Granted: 1973-08-28
•
Expires: 1992-01-03
Abstract
Abstract In an epicyclic gear box all the teeth of the various gear wheels are of single helical form. The tipping couple produced on the planet wheels due to the helix angle of the teeth is balanced by displacing the sun and annulus gears in opposite directions along the planet wheel axis so that the radial components of the tooth loads due to the pressure angles of the teeth produce an opposing couple.
Inventors
- 👤 Roberts M Grigson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:46
CPC Classifications
F; F16; F16H; F16H1/00; F16H1/28; F16H1/2809; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19628
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A simple epicyclic gear train consisting of a single sun wheel, a plurality of planet wheels and a single surrounding annulus gear, all of which have teeth of a single helix angle, wherein the sun wheel and annulus gear are relatively axially displaced along the planet wheels so as to mesh with different axial portions of the teeth on said planet wheels, wherein the radial components of the tooth loads on the planet wheels, due to the pressure angles of the teeth, produce a couple which opposes the tipping moment on the planet wheels due to the sun wheel and annulus gear meshing with teeth of a single helix angle.
Claim 2
Dependent Claim
110 words
A simple epicyclic gear train consisting of a single sun wheel, a plurality of planet wheels and a single surrounding annulus gear, all of which have teeth of a single helix angle, wherein the sun wheel and annulus gear are relatively axially displaced along the planet wheels so as to mesh with different axial portions of the teeth on said planet wheels, wherein the radial components of the tooth loads on the planet wheels, due to the pressure angles of the teeth, produce a couple which opposes the tipping moment on the planet wheels due to the sun wheel and annulus gear meshing with teeth of a single helix angle.
Claim 3
Dependent Claim
126 words
A simple epicyclic gear train consisting of a single sun wheel, a plurality of planet wheels and a single surrounding annulus gear, all of which have teeth of a single helix angle, wherein the sun wheel and annulus gear are relatively axially displaced along the planet wheels so as to mesh with different axial portions of the teeth of the planet wheels adjacent the ends thereof but with a common portion at the mid-length thereof, wherein the radial components of the tooth loads on the planet wheels, due to the pressure angles of the teeth, produce a couple which opposes and substantially balances the tipping moments on the planet wheels due to the sun wheel and annulus gear meshing with teeth of a single helix angle.
Claim 4
Dependent Claim
126 words
A simple epicyclic gear train consisting of a single sun wheel, a plurality of planet wheels and a single surrounding annulus gear, all of which have teeth of a single helix angle, wherein the sun wheel and annulus gear are relatively axially displaced along the planet wheels so as to mesh with different axial portions of the teeth of the planet wheels adjacent the ends thereof but with a common portion at the mid-length thereof, wherein the radial components of the tooth loads on the planet wheels, due to the pressure angles of the teeth, produce a couple which opposes and substantially balances the tipping moments on the planet wheels due to the sun wheel and annulus gear meshing with teeth of a single helix angle.
References Cited (Backward Citations)
US1968604A
Cited
US2179072A
Cited
US2700312A
Cited
US2971385A
Cited
US2923178A
Cited
US2825247A
Cited
US3513715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |