US3580109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Planetary-gear transmission with interconnected sun gears and ring gears
Assignee: ZF Friedrichshafen AG
•
Filing: 1969-09-04
•
Granted: 1971-05-25
•
Expires: 1989-09-04
Abstract
Abstract An automotive transmission with two cascaded planetary gear trains has the two ring gears rigidly connected with each other and with the output shaft, the input shaft being alternately connectable with one planet carrier (forward) or with the two interconnected sun gears (reverse). The driven planet carrier supports two sets of intermeshing planet gears to invert the sense of output-shaft rotation in first and second gear.
Inventors
- 👤 Franz Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:08
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; F16H3/62; F16H3/66; F16H3/666; F16H2003/445; F16H2200/00; F16H2200/003; F16H2200/0039; F16H2200/20; F16H2200/2002; F16H2200/2007; F16H2200/203; F16H2200/2043; F16H2200/2069; F16H2200/2079; F16H2200/2084
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
An automotive transmission for providing a plurality of speed ratios between an engine-driven input shaft and an output shaft, comprising: a first planetary gear train with a first sun gear, a first ring gear and a first planet carrier having a first planet gear in driving engagement with said first sun and ring gears; a second planetary gear train with a second sun gear, a second ring gear and a second planet carrier having a pair of intermeshing second planet gears in driving engagement with said second sun gear and said second ring gear, respectively, said second sun gear being coaxial and rigid with said first ring gear and fixedly connected with said output shaft; first clutch means actuatable for operatively coupling said input shaft with one of said planet carriers to eStablish a first, a second and a third forward position; second clutch means actuatable for operatively coupling said input shaft with said sun gears to establish the third forward position and a reverse position; first brake means actuatable for arresting said sun gears to establish the second forward position; and second brake means actuatable for arresting the other of said planet carriers to establish the forward position and said reverse position.
Claim 2
Dependent Claim
203 words
An automotive transmission for providing a plurality of speed ratios between an engine-driven input shaft and an output shaft, comprising: a first planetary gear train with a first sun gear, a first ring gear and a first planet carrier having a first planet gear in driving engagement with said first sun and ring gears; a second planetary gear train with a second sun gear, a second ring gear and a second planet carrier having a pair of intermeshing second planet gears in driving engagement with said second sun gear and said second ring gear, respectively, said second sun gear being coaxial and rigid with said first ring gear and fixedly connected with said output shaft; first clutch means actuatable for operatively coupling said input shaft with one of said planet carriers to eStablish a first, a second and a third forward position; second clutch means actuatable for operatively coupling said input shaft with said sun gears to establish the third forward position and a reverse position; first brake means actuatable for arresting said sun gears to establish the second forward position; and second brake means actuatable for arresting the other of said planet carriers to establish the forward position and said reverse position.
Claim 3
Dependent Claim
19 words
A transmission as defined in claim 1 wherein said one of said planet carriers is said second planet carrier.
Claim 4
Dependent Claim
22 words
A transmission as defined in claim 2 wherein said first sun gear is of substantially greater radius than said second sun gear.
Claim 5
Dependent Claim
15 words
A transmission as defined in claim 3 wherein said ring gears have substantially identical radii.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |