Patent US2407264A successfully refreshed from Google Patents.
Patent US4446757A successfully refreshed from Google Patents.
US4446757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional gear ratio transmissions
Assignee: National Aeronautics and Space Administration
•
Filing: 1982-06-11
•
Granted: 1984-05-08
•
Expires: 2002-06-11
Abstract
Abstract A directional gear ratio transmission which transfers all clockwise inputs at a gear ratio different from all counter clockwise inputs. A transmission housing 10 encloses first and second epicyclic gear assemblies, 20 and 60, which are controlled by first and second undirectional clutches, 90 and 95, and has a first shaft 11 and a second shaft 12 extending therefrom. Within the first epicyclic gear assembly 20 is a first sun gear 21 connected to the first shaft 11. First planet gears, 24, 25 and 26, mesh with the first sun gear 21and are held symmetrically about the first sun gear by a first planet gear carrier 36. A first ring gear 33 surrounds, and is also in mesh with the first planet gears 24, 25 and 26. Within the second epicyclic gear assembly 60 is a second sun gear 61 interconnected with the first planet gear carrier 36, by a connecting shaft 50. Second planet gears, 64, 65 and 66, mesh with the second sun gear 61 and are held symmetrically about the second sun gear by second planet gear carrier 76 which is connected to the first ring gear 33, by a connecting portion 51. Surrounding and in mesh with the second planet gears is a second ring gear 73 which is connected to the second shaft 12. First and second unidirectional clutches, 90 and 95, only allow rotation of the first planet gear carrier 36, and the first ring gear 33 in a common direction with respect to the transmission housing 10. This transmission inherently reverses all inputs to either the first or second shafts, and transmits all clockwise inputs to either shaft at a gear ratio different from all counterclockwise inputs.
Inventors
- 👤 Alan E. La Fever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:27
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/003; F16H3/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
212 words
A directional gear ratio transmission comprising: transmission housing means; first shaft means; second shaft means; first epicyclic assembly means for receiving input from said first shaft means in a first or a second direction with respect to said transmission housing means; first and second output means, within said first epicyclic assembly means, for transmitting output from said first epicyclic assembly means; first means for restricting transmission of said output from said first output means in said first direction; second means for restricting transmission of said output from said second output means in said first direction; second epicyclic assembly means for transmitting output to said second shaft means in said first or said second direction; first and second input means, within said second epicyclic assembly means, for receiving said output from said first and said second output means; first connecting means for transmitting said output from said first output means to said first input means; second connecting means for transmitting said output from said second output means to said second input means; said input from said first shaft means is transmitted by said directional gear ratio transmission to said second shaft means at a higher speed and lower gear ratio when said input is in said first direction than in said second direction.
Claim 2
Dependent Claim
212 words
A directional gear ratio transmission comprising: transmission housing means; first shaft means; second shaft means; first epicyclic assembly means for receiving input from said first shaft means in a first or a second direction with respect to said transmission housing means; first and second output means, within said first epicyclic assembly means, for transmitting output from said first epicyclic assembly means; first means for restricting transmission of said output from said first output means in said first direction; second means for restricting transmission of said output from said second output means in said first direction; second epicyclic assembly means for transmitting output to said second shaft means in said first or said second direction; first and second input means, within said second epicyclic assembly means, for receiving said output from said first and said second output means; first connecting means for transmitting said output from said first output means to said first input means; second connecting means for transmitting said output from said second output means to said second input means; said input from said first shaft means is transmitted by said directional gear ratio transmission to said second shaft means at a higher speed and lower gear ratio when said input is in said first direction than in said second direction.
Claim 3
Dependent Claim
56 words
A device as in claim 1 wherein: input to said directional gear ratio transmission is applied to said second shaft, in lieu of said first shaft; and said input to said second shaft is transmitted by said first shaft at a higher speed and lower gear ratio in said first direction than in said second direction.
Claim 4
Dependent Claim
28 words
A device as in claim 1 wherein: said first output means is a first planet carrier means; and said second output means is a first ring gear means.
Claim 5
Dependent Claim
28 words
A device as in claim 1 wherein: said first input means is a second sun gear means; and said second input means is a second planet carrier means.
Claim 6
Dependent Claim
36 words
A device as in claim 1 wherein: said first means for restricting transmission of said output is a first unidirectional clutch; and said second means for restricting transmission of said output is a second unidirectional clutch.
Claim 7
Dependent Claim
34 words
A device as in claim 1 wherein: said transmission housing means, first and second epicyclic assembly means, first and second unidirectional clutches, and first and second shaft means are symmetric about a common axis.
Claim 8
Dependent Claim
17 words
A device as in claim 1 wherein: said first and second epicyclic assembly means are gear assemblies.
Claim 9
Dependent Claim
50 words
A device as in claim 1 wherein: said first epicyclic assembly means includes a first sun means, first ring means, first planet carrier means, and first planet means; and said second epicyclic assembly means includes a second sun means, second ring means, second planet carrier means, and second planet means.
Claim 10
Dependent Claim
56 words
A device as in claim 8 wherein: said first ring means is located at a distance equal to the diameter of said first planet means away from said first sun means; and said second ring means is located at a distance equal to the diameter of said second planet means away from said second sun means.
Claim 11
Dependent Claim
110 words
A device as in claim 5 wherein: said first and second unidirectional clutch means includes an inner race means, outer race means attached to said transmission housing means, sprag means located between said inner and outer race means for jamming said inner race means when rotated in an engaging direction, and sprag spring means for holding said sprag means in positions that allow said inner race means to be rotated freely in said second direction; said inner race means of said first unidirectional clutch means is attached to said first output means; and said inner race means of said second unidirectional clutch means is attached to said second output means.
Claim 12
Dependent Claim
51 words
A device as in claim 8 wherein: said first and second sun means are similar; said first and second ring means are similar; and said first and second planet means are similar, whereby elements of the first epicyclic assembly means are interchangeable with corresponding elements of the second epicyclic assembly means.
Claim 13
Dependent Claim
56 words
A device as in claim 8 wherein: said first planet means includes first pinions in contact with said first sun means and second pinions in contact with said first ring means; and said second planet means includes first pinions in contact with said second sun means, and second pinions in contact with said second ring means.
Claim 14
Dependent Claim
31 words
A device as in claim 8 or claim 12 wherein said first ring means is an internal ring wheel means; and said second ring means is an internal ring wheel means.
Claim 15
Dependent Claim
22 words
A transmission device as in claim 8 or claim 12 wherein said first and second ring means are external ring wheel means.
Claim 16
Dependent Claim
39 words
A transmission device as in claim 8 wherein said first sun means, first ring means, and first planet means are ring wheel means, and said second sun means, second ring means and second planet means are ring wheel means.
References Cited (Backward Citations)
SU242630A1
Cited
GB399391A
Cited
GB500054A
Cited
GB586724A
Cited
US2467627A
Cited
GB879040A
Cited
US3307426A
Cited
US3077796A
Cited
US3361010A
Cited
US3521505A
Cited
US4137798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |