US3092970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable ratio hydraulic vehicle drive
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1960-11-16
•
Granted: 1963-06-11
•
Expires: 1980-11-16
Abstract
No abstract record available.
Inventors
- 👤 Achilles C Sampietro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/04; B60K17/10; F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/44; F16H61/444
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
A HYDRAULIC DRIVE SYSTEM FOR A VEHICLE COMPRISING A FIRST HYDRAULIC PUMP HAVING A PREDETERMINED FIXED DISPLACEMENT, A SECOND HYDRAULIC PUMP HAVING A PREDETERMINED FIXED LARGER DISPLACEMENT, A FIRST HYDRAULIC MOTOR FOR CONNECTION TO A WHEEL OF A VEHICLE HAVING A PREDETERMINED FIRST FIXED DISPLACEMENT, A SECOND HYDRAULIC MOTOR FOR CONNECTION TO ANOTHER WHEEL OF THE VEHICLE HAVING A PREDETERMINED SECOND LARGER FIXED DISPLACEMENT, CONDUIT MEANS CONNECTED BETWEEN THE PUMPS AND THE MOTORS FOR DELIVERING THE OUTPUTS OF THE PUMPS TO THE MOTORS, AND VALVE MEANS IN SAID CONDUIT MEANS FOR SELECTIVELY DELIVERING THE OUTPUT OF EITHER ONE OR BOTH OF SAID PUMPS TO EITHER ONE OR BOTH OF SAID MOTORS, SAID PREDETERMINED DISPLACEMENTS CHOSEN SO THAT SUCCESSIVE SPEED INCREASE CAN BE OBTAINED IN A PREDETERMINED PATTERN WITHOUT REQUIRING CHANGE IN THE PUMP SPEED BY CONNECTING IN SEQUENCE THE FIRST PUMP TO THE FIRST AND SECOND MOTORS, THEN TO THE SECOND MOTOR, AND THEN TO FIRST MOTOR; THEN CONNECTING THE SECOND PUMP TO THE FIRST AND SECOND MOTORS, THEN TO THE SECOND MOTOR, AND THEN TO THE FIRST MOTOR; AND THEN CONNECTING BOTH THE FIRST AND SECOND PUMPS TO THE FIRST AND SECOND MOTORS, THEN TO THE SECOND MOTOR, AND THEN TO THE FIRST MOTOR.
Claim 2
Dependent Claim
205 words
A HYDRAULIC DRIVE SYSTEM FOR A VEHICLE COMPRISING A FIRST HYDRAULIC PUMP HAVING A PREDETERMINED FIXED DISPLACEMENT, A SECOND HYDRAULIC PUMP HAVING A PREDETERMINED FIXED LARGER DISPLACEMENT, A FIRST HYDRAULIC MOTOR FOR CONNECTION TO A WHEEL OF A VEHICLE HAVING A PREDETERMINED FIRST FIXED DISPLACEMENT, A SECOND HYDRAULIC MOTOR FOR CONNECTION TO ANOTHER WHEEL OF THE VEHICLE HAVING A PREDETERMINED SECOND LARGER FIXED DISPLACEMENT, CONDUIT MEANS CONNECTED BETWEEN THE PUMPS AND THE MOTORS FOR DELIVERING THE OUTPUTS OF THE PUMPS TO THE MOTORS, AND VALVE MEANS IN SAID CONDUIT MEANS FOR SELECTIVELY DELIVERING THE OUTPUT OF EITHER ONE OR BOTH OF SAID PUMPS TO EITHER ONE OR BOTH OF SAID MOTORS, SAID PREDETERMINED DISPLACEMENTS CHOSEN SO THAT SUCCESSIVE SPEED INCREASE CAN BE OBTAINED IN A PREDETERMINED PATTERN WITHOUT REQUIRING CHANGE IN THE PUMP SPEED BY CONNECTING IN SEQUENCE THE FIRST PUMP TO THE FIRST AND SECOND MOTORS, THEN TO THE SECOND MOTOR, AND THEN TO FIRST MOTOR; THEN CONNECTING THE SECOND PUMP TO THE FIRST AND SECOND MOTORS, THEN TO THE SECOND MOTOR, AND THEN TO THE FIRST MOTOR; AND THEN CONNECTING BOTH THE FIRST AND SECOND PUMPS TO THE FIRST AND SECOND MOTORS, THEN TO THE SECOND MOTOR, AND THEN TO THE FIRST MOTOR.
References Cited (Backward Citations)
US1047329A
Cited
US1156818A
Cited
US1987698A
Cited
US1926692A
Cited
US2103530A
Cited
US2276895A
Cited
US2370526A
Cited
US2681117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |