US3733928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed change gear device
Assignee: Toyota Motor Corp
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Filing: 1970-06-02
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Granted: 1973-05-22
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Expires: 1990-06-02
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
- 👤 S Uozumi
- 👤 K Kirosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:16
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; F16H3/62; F16H3/66; F16H3/663; F16H2200/00; F16H2200/003; F16H2200/0043; F16H2200/20; F16H2200/2002; F16H2200/2005; F16H2200/2007; F16H2200/202; F16H2200/2025; F16H48/00; F16H48/06; F16H48/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 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 actuation of said clutch and brake means.
Claim 2
Dependent Claim
103 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 actuation of said clutch and brake means.
Claim 3
Dependent Claim
101 words
A speed change gear device according to claim 1, wherein said planetary gear train comprises three sun gears each of which are independently rotatable, a long pinion having three gear portions in respective engagement with two sun gears and an idle gear, the idle gear being related to one of the sun gears and said long pinion, a carrier rotatably supporting said long pinion and said idle gear, whereby a sun gear engaged with the idle gear is connected to said second clutch means, the remaining two sun gears being connected to said first clutch means and said output shaft, respectively.
Claim 4
Dependent Claim
50 words
A speed change gear device according to claim 1, wherein the planetary gear train includes a sun gear, and two sets of a gear train including a pinion gear engaged with the sun gear, a ring gear engaged with the pinion gear, and a carrier rotatably supporting said pinion gear.
Claim 5
Dependent Claim
60 words
A speed change gear device according to claim 3, wherein the sun gear is connected to the second clutch means, the ring gear of a first one of said gear trains is connected to the first clutch means, and the carrier of one gear train and the ring gear of the other gear train are connected to the output shaft.
Claim 6
Dependent Claim
58 words
A speed change gear device according to claim 3, wherein the sun gear is connected to the second clutch means, the ring gear of the second gear train is connected to the first clutch means, and the ring gear of the first gear train and the carrier of the second gear train are connected to the output shaft.
Claim 7
Dependent Claim
140 words
A speed change gear device according to claim 1, wherein the planetary gear train comprises, in combination, four sun gears, each of which are independently rotatable, and idle gear having two integrally formed gear portions in engagement with two of the four sun gears, a long pinion having three integrally formed gear portions in engagement with the remaining two sun gears and said idle gear, respectively, a carrier rotatably supporting the long pinion and the idle gear, one of said two sun gears in engagement with said gear portions of said idle gear being connected to the first clutch means, the remaining one of said two sun gears in engagement with said gear portions of said idle gears being connected to the output shaft, and any one of the remaining two sun gears being connected to the second clutch means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |