Patent US1763997A successfully refreshed from Google Patents.
Patent US3859871A successfully refreshed from Google Patents.
US3859871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed change gear device
Assignee: Toyota Motor Corp
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Filing: 1973-03-09
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Granted: 1975-01-14
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Expires: 1993-03-09
Abstract
Abstract A speed change gear device which comprises a relatively small number of planetary gears and associated parts and which is especially applicable to the transmission mechanism of a smallersized automotive vehicle. The speed change gear device employs additional brake means to fix an input member of a planetary gear train to the gear case to furnish a greater speed change ratio or a greater number of speed change steps without increasing the number of gears in the planetary gear train.
Inventors
- 👤 Sumio Uozumi
- 👤 Koichiro Hirosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:13
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; F16H3/62; F16H3/66; F16H3/663; F16H1/00; F16H1/02; F16H1/04; F16H1/12; F16H1/14; F16H1/145; F16H2200/00; F16H2200/003; F16H2200/0043; F16H2200/0047; F16H2200/20; F16H2200/2002; F16H2200/2005; F16H2200/2007; F16H2200/203; F16H2200/2043; F16H2200/2046; F16H2720/00; F16H2720/04; F16H48/00; F16H48/06; F16H48/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
A speed change gear device consisting essentially of a first and a second clutch means provided between an input and an output shaft disposed concentrically within a gear case, and a planetary gear train having a first and a second input gear member connected, respectively, to said first and second clutch means, an output gear member connected to said output shaft, and a first and second brake means for holding said first and second input gear members, respectively, whereby a combination of speed change ratios of required steps is obtained at the output shaft by selective action of said clutch and brake means, the planetary gear train comprising two sun gears each of which is independently rotatable, a short pinion gear in engagement with one of the sun gears, a long pinion gear in engagement with the short pinion gear and with the other sun gear, a ring gear engaged with the long pinion gear, and a carrier rotatably supporting said short and long pinion gears.
Claim 2
Dependent Claim
166 words
A speed change gear device consisting essentially of a first and a second clutch means provided between an input and an output shaft disposed concentrically within a gear case, and a planetary gear train having a first and a second input gear member connected, respectively, to said first and second clutch means, an output gear member connected to said output shaft, and a first and second brake means for holding said first and second input gear members, respectively, whereby a combination of speed change ratios of required steps is obtained at the output shaft by selective action of said clutch and brake means, the planetary gear train comprising two sun gears each of which is independently rotatable, a short pinion gear in engagement with one of the sun gears, a long pinion gear in engagement with the short pinion gear and with the other sun gear, a ring gear engaged with the long pinion gear, and a carrier rotatably supporting said short and long pinion gears.
Claim 3
Dependent Claim
46 words
A speed change gear device according to claim 1, wherein the sun gear engaged with the short pinion gear is connected to said second clutch means, the other sun gear is connected to said first clutch means, and the carrier is connected to the output shaft.
Claim 4
Dependent Claim
47 words
A speed change gear device according to claim 1, wherein the sun gear engaged with the short pinion gear is connected to said first clutch means, the other sun gear is connected to said second clutch means, and the ring gear is connected to the output shaft.
Claim 5
Dependent Claim
45 words
A speed change gear device according to claim 1, wherein the sun gear engaged with the short pinion gear is connected to said first clutch means, the ring gear is connected to said second clutch means, and the carrier is connected to the outputs shaft.
References Cited (Backward Citations)
US3188885A
Cited
US3513722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |