US3792629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed reducer with ring and planet gears having different circular pitches
Assignee: McDonnell Douglas Corp
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Filing: 1971-12-30
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Granted: 1974-02-19
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Expires: 1991-12-30
Abstract
Abstract A single stage speed reducer having a speed reduction ratio capability of from 1:1 to over 100,000:1. Ring gear modification of either or both of a static and a mobile ring gear by removal or addition of a tooth and respacing those remaining without changing the ring gear diameter causes the planet gear to ''''creep'''' relative to the ring gear as it orbits about the sun gear, the creep occurring at the planet gear/ring gear interface. This results in a mobile ring gear output of one modified tooth spacing orbit of the planet gear about the sun gear. Other configurations result in a partial tooth spacing output movement per orbit.
Inventors
- 👤 W Applebury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:03
CPC Classifications
F; F16; F16H; F16H1/00; F16H1/28; F16H1/46; F16H2001/2881
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A speed reducer comprising: a gear housing having a first ring gear fixedly mounted therein, a second ring gear rotatably mounted therein, one of said ring gears being larger in pitch diameter by the addition of one tooth thereto, a plurality of double faced planet gears whose face gears are of a diameter to fit and mate with said ring gears, the faces of said planetary gears having predetermined diametral pitches, the ring gear of larger diameter having a circular pitch decreased by one tooth per circumference less than the circular pitch of its associated planetary gear face, and a sun gear for driving one of the faces of each of said planetary gears.
Claim 2
Dependent Claim
114 words
A speed reducer comprising: a gear housing having a first ring gear fixedly mounted therein, a second ring gear rotatably mounted therein, one of said ring gears being larger in pitch diameter by the addition of one tooth thereto, a plurality of double faced planet gears whose face gears are of a diameter to fit and mate with said ring gears, the faces of said planetary gears having predetermined diametral pitches, the ring gear of larger diameter having a circular pitch decreased by one tooth per circumference less than the circular pitch of its associated planetary gear face, and a sun gear for driving one of the faces of each of said planetary gears.
Claim 3
Dependent Claim
42 words
A speed reducer as in claim 1 wherein the motion of the second ring gear is due to the difference in pitch diameters of the two ring gears offset by creep between the planet gear and said ring gear of larger diameter.
References Cited (Backward Citations)
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US1323245A
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US1499763A
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |