Hydrostatic transmission
Abstract
Abstract A HYDROSTATIC TRANSMISSION FOR A VEHICLE INCLUDING A VARIABLE DISPLACEMENT HYDRAULIC PUMP AND A VARIABLE DISPLACEMENT HYDRAULIC MOTOR INTERCONNECTED IN CLOSED CIRCUIT BY MAIN FLUID CONDUITS, THERE BEING PROVIDED A DUMP VALVE FOR SELECTIVELY INTERCONNECTING THE CONDUITS TO PERMIT FREE WHEELING OF THE MOTOR, WITH THIS DUMP VALVE BEING RESPONSIVE TO A PRESSURE DIFFERENTIAL IN THE MAIN CONDUITS TO HOLD THE VALVE IN ITS DUMP OF FREE WHEELING POSITION SO THAT THE VALVE WILL AUTOMATICALLY RETURN TO ITS INACTIVE POSITION ONLY WHEN THE PRESSURE IN THE MAIN CONDUITS IS APPROXIMATELY EQUAL PREVENTING VEHICULAR JERKING WHICH WOULD OCCUR OTHERWISE IF THE DUMP VALVE COULD BE MANUALLY DEACTIVATED WHEN THERE WAS A PRESSURE DIFFERENTAIL BETWEEN THE CONDUITS.
Inventors
- 👤 John W Pinkerton
- 👤 Lyle S Martin
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |