US5092824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump output control system with high efficiency hydromechanical variable speed drive
Assignee: Individual
•
Filing: 1990-10-09
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Granted: 1992-03-03
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Expires: 2010-10-09
Abstract
Abstract A power recovery speed control apparatus for use in a system driven by a substantially constant-speed power source driving a turbine type water pump. The system includes a hydromechanical trimmer device controlled by pump output pressure to modify the turbine pump speed over a relatively small range as a function of pump output pressure. In series between the power source output shaft and the turbine pump drive shaft is a mechanical differential gear assembly having input, output and differential (speed difference) shafts. A fixed displacement hydrostatic transmission unit (pump) extracts a fraction of the source power at the differential shaft and applies it through hydraulic feed lines to a variable displacement hydrostatic transmission unit operated as a hydraulic motor. The hydraulic motor unit has its displacement controlled by a pump output pressure sensor and its output torque is introduced into the power train at the power source output or alternatively, at the turbine pump input shaft.
Inventors
- 👤 Donald C. Connett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:13
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/028; F04D15/00; F04D15/0066; F16; F16H; F16H47/00; F16H47/02; F16H47/04; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
219 words
A system for controlling the delivery rate of a liquid pump to a predetermined level, said pump including a source of substantially constant speed drive power and a pump exhibiting a non-linear power versus fluid delivery characteristic such that a predetermined reduction of said drive power effects a proportionally larger corresponding reduction of said delivery rate, the combination comprising: first means comprising a mechanical differential having a first shaft connected from said source of drive power, a second shaft connected to said pump and a third shaft providing an output at speed proportional to the difference between the speeds of said first and second shafts; second means comprising a fixed displacement hydraulic pump driven from said third shaft and a variable displacement hydraulic motor powered by pressurized hydraulic fluid from said fixed displacement hydraulic pump, said variable displacement hydraulic motor having an output shaft and displacement adjustment means controllable by an externally applied parameter; third means comprising a mechanical power reentry connection from said variable displacement hydraulic motor output shaft to a point in the power train between said source of drive power and said liquid pump; and fourth means responsive to the output pressure of said liquid pump as a parameter relating to said liquid pump delivery rate to control said displacement of said variable displacement hydraulic motor.
Claim 2
Independent Claim
219 words
A system for controlling the delivery rate of a liquid pump to a predetermined level, said pump including a source of substantially constant speed drive power and a pump exhibiting a non-linear power versus fluid delivery characteristic such that a predetermined reduction of said drive power effects a proportionally larger corresponding reduction of said delivery rate, the combination comprising: first means comprising a mechanical differential having a first shaft connected from said source of drive power, a second shaft connected to said pump and a third shaft providing an output at speed proportional to the difference between the speeds of said first and second shafts; second means comprising a fixed displacement hydraulic pump driven from said third shaft and a variable displacement hydraulic motor powered by pressurized hydraulic fluid from said fixed displacement hydraulic pump, said variable displacement hydraulic motor having an output shaft and displacement adjustment means controllable by an externally applied parameter; third means comprising a mechanical power reentry connection from said variable displacement hydraulic motor output shaft to a point in the power train between said source of drive power and said liquid pump; and fourth means responsive to the output pressure of said liquid pump as a parameter relating to said liquid pump delivery rate to control said displacement of said variable displacement hydraulic motor.
Claim 3
Dependent Claim
28 words
The combination according to claim 1 in which said liquid pump is a turbine type pump and said source of drive power is an alternating current induction motor.
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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) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |