Hydraulic control system of an automatic transmission
Abstract
Abstract A CHANGE-OVER VALVE IS PROVIDED RESPONSIVE AT ONE END THEREOF TO AN OIL PRESSURE PROPORTIONAL TO ENGINE THROTTLE OPENING AND AT THE OTHER END THEREOF TO AN OIL PRESSURE PROPORTIONAL TO ACTUAL CAR SPEED, THE LATTER OIL PRESSURE BEING DERIVED FROM A GOVERNOR ON THE PLANETARY OUTPUT SHAFT. UNDER CONDITIONS OF LOW CAR SPEED AND HIGH TORQUE DEMAND THE THROTTLE PRESSURE IS EFFECTIVE TO MOVE THE CHANGE-OVER VALVE TO THE LEFT THEREBY COMMUNICATING THE OIL LINE SUPPLY PRESSURE TO A PRESSURE REGULATOR VALVE CHAMBER THEREBY CAUSING THE PRESSURE REGULATOR VALVE TO INCREASE THE OIL LINE PRESSURE SUPPLIED TO THE HYDRAULICALLY OPERATED CLUTCHES, BRAKE BANDS, ETC. AS CAR SPEED INCREASES, THE GOVERNOR PRESSURE OVERCOMES THE THROTTLE PRESSURE AND MOVES THE CHANGE-OVER VALVE BACK TOWARD THE RIGHT. THIS CAUSES THE OIL LINE PRESSURE TO EXHAUST FROM THE AFOREMENTIONED REGULATOR VALVE CHAMBER THEREBY DECREASING THE OIL LINE PRESSURE SUPPLIED TO THE VARIOUS HYDRAULICALLY OP- ERATED CLUTCHES, BRAKE BANDS, ETC. OPERATION OF THE MANUAL VALVE FROM THE DRIVE POSITION TO THE LOW POSITION IS EFFECTIVE TO RENDER THE CHANGE-OVER VALVE RESPONSIVE TO THE OIL LINE PRESSURE RATHER THAN THE THROTTLE OPENING PRESSURE.
Inventors
- 👤 Seitoku Kubo
Bibliographic Details
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |