Patent US3736815A successfully refreshed from Google Patents.
US3736815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission mechanism
Assignee: Toyota Motor Corp
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Filing: 1972-01-20
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Granted: 1973-06-05
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Expires: 1992-01-20
Abstract
Abstract A four-forward-speed transmission comprising an intermediate shaft, two sets of single pinion planetary gears, and a double pinion planetary gear, with all of said components being concentrically arranged between an input shaft and an output shaft. A first clutch is adapted to apply an input to the intermediate shaft, and a second clutch is adapted to apply an input to both sun gears of the two sets of single pinion planetary gears which are integrally connected. A first brake is adapted to restrict the rotation of both the sun gears of the two sets of single pinion planetary gears, and a second brake is adapted to simultaneously restrict the rotation of a carrier of the second single pinion planetary gear of said two sets of single pinion planetary gears as well as the rotation of a carrier of the double pinion planetary gear. A third brake is adapted to restrict the rotation of a ring gear of the double pinion planetary gear. The first clutch is always in operation when a vehicle is moving forward, and therefore first speed is obtained by operation of the third brake. Second speed is obtained by operation of the first brake, the fourth speed by the operation of the second clutch, and reverse speed by operation of the second clutch and the third brake.
Inventors
- 👤 S Ito
- 👤 S Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:02
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/44; F16H3/62; F16H3/66; F16H3/666
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
260 words
A power transmission mechanism comprising a casing, an input shaft, an intermediate shaft, first and second single pinion planetary gears each including a sun gear and a ring gear, a double pinion planetary gear including a sun gear and a ring gear, and an output shaft, with all of said components being concentrically arranged, a first clutch provided between said input shaft and said intermediate shaft, means integrally connecting said sun gears of said single pinion planetary gears, a second clutch provided between said input shaft and said integrally connected sun gears of said single pinion planetary gears, means connecting said intermediate shaft to said ring gear of said first single pinion planetary gear, a first brake provided between said integrally connected sun gears and said casing, a carrier for said first single pinion planetary gear, means connecting said first single pinion planetary gear, said ring gear of said second single pinion planetary gear and said sun gear of said double pinion planetary gear to said output shaft, a carrier for said second single pinion planetary gear, a second brake provided between said second single pinion planetary gear carrier and said casing, a carrier for said double pinion planetary gear connected to said second single pinion planetary gear c8 carrier, a third brake provided between said ring gear of said double pinion planetary gear and said casing, and means for effecting selective engagement and disengagement of said brakes and clutches to provide desired gear ratios for four forward speeds and one reverse speed in the operation of said transmission mechanism.
Claim 2
Dependent Claim
260 words
A power transmission mechanism comprising a casing, an input shaft, an intermediate shaft, first and second single pinion planetary gears each including a sun gear and a ring gear, a double pinion planetary gear including a sun gear and a ring gear, and an output shaft, with all of said components being concentrically arranged, a first clutch provided between said input shaft and said intermediate shaft, means integrally connecting said sun gears of said single pinion planetary gears, a second clutch provided between said input shaft and said integrally connected sun gears of said single pinion planetary gears, means connecting said intermediate shaft to said ring gear of said first single pinion planetary gear, a first brake provided between said integrally connected sun gears and said casing, a carrier for said first single pinion planetary gear, means connecting said first single pinion planetary gear, said ring gear of said second single pinion planetary gear and said sun gear of said double pinion planetary gear to said output shaft, a carrier for said second single pinion planetary gear, a second brake provided between said second single pinion planetary gear carrier and said casing, a carrier for said double pinion planetary gear connected to said second single pinion planetary gear c8 carrier, a third brake provided between said ring gear of said double pinion planetary gear and said casing, and means for effecting selective engagement and disengagement of said brakes and clutches to provide desired gear ratios for four forward speeds and one reverse speed in the operation of said transmission mechanism.
Claim 3
Dependent Claim
28 words
A transmission mechanism according to claim 1, wherein a first forward speed gear ratio is obtain by simultaneous engagement of said first clutch and of said third brake.
Claim 4
Dependent Claim
28 words
A transmission mechanism according to claim 1, wherein a second forward speed gear ratio is obtained by simultaneous engagement of said first clutch and of said second brake.
Claim 5
Dependent Claim
28 words
A transmission mechanism according to claim 1, wherein a third forward speed gear ratio is obtained by simultaneous engagement of said first clutch and of said first brake.
Claim 6
Dependent Claim
27 words
A transmission mechanism according to claim 1, wherein a fourth forward speed gear ratio is obtained by simultaneous engagement of said first and of said second clutches.
Claim 7
Dependent Claim
27 words
A transmission mechanism accoRding to claim 1, wherein a reverse speed gear ratio is obtained by simultaneous engagement of said second clutch and of said third brake.
References Cited (Backward Citations)
US3678785A
Cited
US3678784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |