Hydraulic control for change speed gear transmission
Abstract
Abstract A HYDRAULIC THREE-SPEED GEAR TRANSMISSION EMPLOYING TWO FLUID OPERATED FRICTION CLUTCHES AND TWO BAND BRAKES WITH RESPECTIVE DOUBLE ACTING SERVO PISTONS. THE DISENGAGING CHAMBER OF ONE SERVO PISTON IS DISRECTLY CONNECTED WITH THE ENGAGING PRESSURE CHAMBER OF ONE CLUTCH AND A PRESSURE ACCUMULATOR WITH A SLIDE VALVE CONTROLLING THE PRESSURE THERETO, THE ENGAGING PRESSURE CHAMBER IS DIRECTLY CONNECTED WITH THE DISENGAGING PRESSURE CHAMBER OF THE SECOND SERVO PISTON AND A SECOND FLUID ACCUMULATOR SELECTIVELY RECEIVING PRESSURE UNDER THE CONTROL OF THE SLIDE VALVE. THE SLIDE VALVE IS CONTROLLED ACCORDING TO THE BAROMETRIC PRESSURE, THE ENGINE LOAD AND THE ENGINE SPEED, WITH A MANUAL OVERRIDE. A PRESSURE REGULATOR IS PROVIDED FOR A PART OF THE HYDRAULIC CIRCUIT.
Inventors
- 👤 Imre Szodfridt
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |