US3818775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric differential gearing arrangement
Assignee: National Aeronautics and Space Administration
•
Filing: 1972-11-29
•
Granted: 1974-06-25
•
Expires: 1992-11-29
Abstract
Abstract Two input members and two concentric rotatable output members are interconnected by a planetary gear arrangement. The first input drives directly the first output. The second input engages a carrier having the planetary gears affixed thereto. Rotation of the carriage causes rotation of the central sun gear of the planetary gear system. The sun gear is journaled to the carriage and is drivingly connected to the second output through a direction reversing set of bevel gears. The first input drive member includes a ring gear drivingly connected to the planetary gears for driving the second output member in the same direction and by the same amount as the first output member. Motion of the first input results in equal motion of the two outputs while input motion of the second input results in movement of the second output relative to the first output. This device is useful where non-interacting two-axis control of remote gimbaled systems is required.
Inventors
- 👤 R Zeiger
- 👤 J Gerdts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:20
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; G; G05; G05G; G05G13/00; F16H2720/00; G05G2700/00; G05G2700/22; G05G2700/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
In a concentric differential gearing arrangement first and second concentric output members, cage means for rotatably supporting said first and second output members, first input drive means for rotatably driving said first output member, a carriage structure rotatably supported relative to said cage means and said first output member and being concentrically rotatable relative to said first and second output members, a plurality of planetary gears carried from said carriage structure, sun gear means centrally disposed of said planetary gears and drivingly connected with said planetary gears and with said second output member, an internally toothed ring gear secured to said first output member and drivingly connected to said planetary gears for driving said gun gear and for, in turn, rotatably driving said second output member with rotation of said first output member to cause said first and second output members to rotate an equal amount in the same direction, second input drive means for rotating said carriage structure to cause said second output member to be rotated via said planetary gears and said sun gear independently of rotation of said first output member.
Claim 2
Dependent Claim
184 words
In a concentric differential gearing arrangement first and second concentric output members, cage means for rotatably supporting said first and second output members, first input drive means for rotatably driving said first output member, a carriage structure rotatably supported relative to said cage means and said first output member and being concentrically rotatable relative to said first and second output members, a plurality of planetary gears carried from said carriage structure, sun gear means centrally disposed of said planetary gears and drivingly connected with said planetary gears and with said second output member, an internally toothed ring gear secured to said first output member and drivingly connected to said planetary gears for driving said gun gear and for, in turn, rotatably driving said second output member with rotation of said first output member to cause said first and second output members to rotate an equal amount in the same direction, second input drive means for rotating said carriage structure to cause said second output member to be rotated via said planetary gears and said sun gear independently of rotation of said first output member.
Claim 3
Dependent Claim
63 words
The apparatus of claim 1 including a first bevel gear secured to said sun gear, a second bevel gear secured to said second output member, and differential bevel gear means rotatable carried from said cage means and drivingly interconnecting said first and second bevel gear means for causing said second output member to be rotated in the opposite direction as said sun gear.
Claim 4
Dependent Claim
36 words
The apparatus of claim 1 wherein said sun gear includes, a ring gear coaxially disposed of said second output member, and wherein said carriage structure is centrally apertured and coaxially disposed of said second output member.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1 wherein said second output member is a shaft, and means for journaling said second output member relative to said first output member and relative to said carriage structure.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4 including, means for journaling said sun gear relative to said carriage structure.
Claim 7
Dependent Claim
58 words
The apparatus of claim 4 including, nut means threadably mating with a threaded portion of said second output member, and means for rotatably capturing said nut means to said first output member, whereby rotation of said second output member relative to said first output member produces rectilinear translation of said nut means relative to said first output member.
References Cited (Backward Citations)
CA483519A
Cited
US1720018A
Cited
US2196368A
Cited
US2221186A
Cited
US2911760A
Cited
US2940337A
Cited
US3326060A
Cited
US3364789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |