Automotive transmission
Abstract
Abstract A HYDRAULIC CONTROL SYSTEM FOR AN AUTOMATIC TRANSMISSION HAVING A HYDRAULIC CONVERTER, FLUID PRESSURE OPERATED FRICTION ENGAGING DEVICES TO PROVIDE A PLURALITY OF SPEED RATIO DRIVE TRAINS UPON SERIAL AUTOMATIC ACTUATION OF SHIFT VALVES TO UPSHIFTED POSITIONS BY VEHICLE SPEEDRESPONSIVE GOVERNOR PRESSURE AND DOWNSHIFTABLE BY THROTTLE-RESPONSIVE PRESSURE, A FLUID-OPERATED FRICTION BRAKE FOR LOW SPEED RATIO, AND A CONTROL VALVE FOR THE BRAKE AND A MANUAL VALVE TO PROVIDE FLUID PRESSURE TO THE BRAKE ONLY IN THE DOWNSHIFTED POSITION OF THE SHIFT VALVES, AN ACCUMULATOR TO CONTROL ENGAGING FLUID PRESSURE OF THE ENGAGING DEVICES, AND A STALL CONTROL VALVE FUNCTIONING TO CHANGE THE EFFECTIVE REGULATED OUTPUT PRESSURE FROM A REGULATOR VALVE AND TO PROVIDE INCREASED ACTUATING FLUID PRESURE DURING TORQUE MULTIPLICATION OF THE TORQUE CONVERTER, D R A W I N G
Inventors
- 👤 J Smith
Bibliographic Details
Claims Analysis
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |