Regulated hydraulic drive
Abstract
Abstract A HYDRAULIC COMPRISES A COMBUSTION ENGINE, A HYDRAULIC TRANSMISSION WHOSE PUMP IS DRIVEN BY THE ENGINE, AND A REGULATING APPARATUS INCLUDING AN AUXILIARY PUMP DISCHARGING THROUGH A MAIN CONDUIT, WHOSE PRESSURE IS REGULATED BY A PRESSURE-REGULATING VALVE UNDER THE CONTROL OF AN OPERATOR, AND THROUGH TWO VARIABLE THROTTLES WHOSE THROTTLE CROSS-SECTIONS ARE SIMULTANEOUSLY INCREASED AND DECREASED, RESPECTIVELY, BY THROTTLE CONTROL MEANS RESPONSIVE TO THE PRESSURE IN THE TRANSMISSION PUMP. THE DIFFERENT THROTTLED PRESSURES ARE APPLIED TO A FIRST SERVO MOTOR CONTROLLING THE ROTARY SPEED OF THE COMBUSTION ENGINE, AND TO A SECOND SERVO MOTOR CONTROLLING THE TRANSMISSION PUMP TO VARY THE PISTON STROKE AND OUTPUT OF THE SAME. WHEN THE OPERATOR ADJUSTS THE PRESSURE-REGULATING VALVE, THE TRANSMISSION MOTOR OPERATES AT DIFFERENT ROTARY SPEEDS, AND ANY SELECTED ROTARY SPEED IS MAINTAINED BY THE REGULATING APPARATUS CONSTANT AND INDEPENDENT OF THE LOAD, WHILE THE REGULATED HYDRAULIC DRIVE OPERATES AT OPTIMAL EFFICIENCY.
Inventors
- 👤 Walter Kobald
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |