US3712154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission
Assignee: Individual
•
Filing: 1970-11-04
•
Granted: 1973-01-23
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Expires: 1990-11-04
Abstract
Abstract An infinitely variable speed transmission having a hydraulic torque converter or other variable speed variable torque mechanism supplying reaction to a plurality of planetary gearsets arranged in series, output member of first gearset connected to input member of following gearset, with the power source that drives the torque converter also driving the first gearset input member. The first gearset always operates in split torque drive. All except the first gearset reaction members have one way brakes holding them from rearward rotation. Clutches between the gearset reaction members connect them together to give split torque drive in the gearsets following the first one. A formula for determining ratios in planetary gearsets operating in split torque drive is given.
Inventors
- 👤 A Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:52
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/06; F16H47/08; F16H47/085; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
341 words
In a hydrodynamic and planetary split torque transmission; a transmission case housing in coaxial alignment a driving shaft, a driven shaft, a direct drive power train arranged between said shafts and a hydraulic power train surrounding said direct drive power train; said power trains including a plurality of planetary gear sets, the first of said gearsets having a direct driven member, a hydraulically driven member, and an output member, each following gearset having a direct driven member, a reaction member adapted to be hydraulically driven, and an output member; said direct drive power train including power transmitting means connecting said driving shaft to the first gearset direct drive member, and power transmitting means connecting each gearset output member to the following gearset direct driven member, said driven shaft being connected to the last gearset output member, and brake means between said transmission case and each following gearset reaction member; said hydraulic power train including a hydraulic torque converter having an impeller, a turbine, and reactor means, said reactor providing variable speed variable torque drive between said impeller and said turbine, power transmitting means connecting said turbine to the first gearset hydraulically driven member, connecting clutch means for transmitting hydraulic power from the first gearset hydraulically driven member to the following gearset reaction member, and connecting clutch means for transmitting hydraulic power from the preceding gearset hydraulically driven member to the following gearset reaction member, each of said brake means being overridden when the associated gearset hydraulically driven member connecting clutch is engaged; and control means for controlling said reaction member brake means and said hydraulically driven member connecting clutch means, said control means effecting part direct drive, part hydraulic drive in the affected gearsets and maximum reduction in the following gearsets, and effecting a continuously and infinitely variable change of ratios from maximum reduction to split torque drive in all gearsets; said control means including governor means arranged to control said gearset reaction member brake means and said hydraulically driven member connecting clutch means sequentially from front gearset to rear gearset.
Claim 2
Dependent Claim
341 words
In a hydrodynamic and planetary split torque transmission; a transmission case housing in coaxial alignment a driving shaft, a driven shaft, a direct drive power train arranged between said shafts and a hydraulic power train surrounding said direct drive power train; said power trains including a plurality of planetary gear sets, the first of said gearsets having a direct driven member, a hydraulically driven member, and an output member, each following gearset having a direct driven member, a reaction member adapted to be hydraulically driven, and an output member; said direct drive power train including power transmitting means connecting said driving shaft to the first gearset direct drive member, and power transmitting means connecting each gearset output member to the following gearset direct driven member, said driven shaft being connected to the last gearset output member, and brake means between said transmission case and each following gearset reaction member; said hydraulic power train including a hydraulic torque converter having an impeller, a turbine, and reactor means, said reactor providing variable speed variable torque drive between said impeller and said turbine, power transmitting means connecting said turbine to the first gearset hydraulically driven member, connecting clutch means for transmitting hydraulic power from the first gearset hydraulically driven member to the following gearset reaction member, and connecting clutch means for transmitting hydraulic power from the preceding gearset hydraulically driven member to the following gearset reaction member, each of said brake means being overridden when the associated gearset hydraulically driven member connecting clutch is engaged; and control means for controlling said reaction member brake means and said hydraulically driven member connecting clutch means, said control means effecting part direct drive, part hydraulic drive in the affected gearsets and maximum reduction in the following gearsets, and effecting a continuously and infinitely variable change of ratios from maximum reduction to split torque drive in all gearsets; said control means including governor means arranged to control said gearset reaction member brake means and said hydraulically driven member connecting clutch means sequentially from front gearset to rear gearset.
References Cited (Backward Citations)
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |