US3687578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump motor
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-09-04
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Granted: 1972-08-29
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Expires: 1990-09-04
Abstract
Abstract A positive displacement hydraulic pump (motor) which employs a gerotor gear set for displacing (for being displaced by) the fluid. The gear set includes an externally toothed rotor and an internally toothed stator ring. The teeth of the stator ring comprise roller vanes for meshing with the teeth of the stator. The capacity of the pump can be varied, in one embodiment by varying the degree of overlapping of the teeth of the rotor and stator ring and thus varying the effective displacement of the gears, and in another embodiment by employing a second gerotor gear set, the phase of which can be adjusted with respect to the first gerotor gear set for varying the effective displacement of both sets.
Inventors
- 👤 Hollis N White Jr
- 👤 Dale E Bough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:54
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/10; F04C14/18; F04C2/00; F04C2/08; F04C2/10; F04C2/102
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A variable displacement hydraulic pump comprising a housing having a fluid inlet and a fluid outlet, a shaft rotatably mounted on said housing, a pair of gear members carried within said housing for relative orbital and rotational movement about a central axis and having gear teeth axially overlapping one another in meshing relation to provide expanding and contracting fluid pockets therebetween, means rotationally interconnecting one of said gear members and said shaft, and commutation means for communicating said fluid inlet and said fluid outlet with said fluid pockets in timed relation to the relative orbital and rotational movement of said gear members, said gear members being movable axially relative to one another to vary the degree of overlapping of said gear teeth and the fluid confining volume of the pockets therebetween, said commutation means comprising a commutator valve assembly disposed axially adjacent said gear members and movable axially therewith for directing fluid into and out of said fluid pockets in an axial direction.
Claim 2
Dependent Claim
163 words
A variable displacement hydraulic pump comprising a housing having a fluid inlet and a fluid outlet, a shaft rotatably mounted on said housing, a pair of gear members carried within said housing for relative orbital and rotational movement about a central axis and having gear teeth axially overlapping one another in meshing relation to provide expanding and contracting fluid pockets therebetween, means rotationally interconnecting one of said gear members and said shaft, and commutation means for communicating said fluid inlet and said fluid outlet with said fluid pockets in timed relation to the relative orbital and rotational movement of said gear members, said gear members being movable axially relative to one another to vary the degree of overlapping of said gear teeth and the fluid confining volume of the pockets therebetween, said commutation means comprising a commutator valve assembly disposed axially adjacent said gear members and movable axially therewith for directing fluid into and out of said fluid pockets in an axial direction.
Claim 3
Dependent Claim
57 words
The invention as defined in claim 1 wherein said commutator valve assembly comprises a pair of valve elements one of which is carried for rotation about said central axis and the other of which is maintained rotationally stationary, both of said valve elements being movable axially in accordance with the relative axial movement of said gear members.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |