US3616882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic motor-pump assembly with built-in brake
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-02-05
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Granted: 1971-11-02
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Expires: 1990-02-05
Abstract
Abstract A hydraulic motor-pump assembly having an axial chamber formed therein, a pair of axially spaced stationary radial wall members within the chamber, a pair of relatively rotationally and orbitally movable gear members disposed within the chamber between the radial wall members to form expanding and contracting fluid pockets between the teeth thereof and various fluid ports and passages for directing fluid through the housing and to and from the respective fluid pockets in synchronism with the relative movement of the gear members. A work input-output shaft is connected for joint rotation to one of the gear members. A nonrotatable flexible disc-shaped braking plate is disposed within the chamber between the rotatable one of the gear members and one of said radial wall members. A fluid pressure chamber is formed behind the braking plate in said one radial wall member. A fluid passage is formed in the housing for connecting the pressure chamber to a source of pressurized fluid to selectively urge the braking plate into tight frictional gripping relation with the rotatable gear member thereby braking or locking the gear member against rotation.
Inventors
- 👤 Harvey Clinton White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:54
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/02; F04; F04C; F04C15/00; F04C15/0057; F04C15/0084; F04C2/00; F04C2/08; F04C2/10; F04C2/103; F04C2/104; F16D; F16D63/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
A hydraulic motor-pump assembly comprising an axial housing and means including a wall member forming a chamber within said housing, a fluid inlet and a fluid outlet formed in said housing for directing fluid to and from said chamber, a gerotor gear set in said chamber including an internally toothed stator and an externally toothed rotor within said stator and having one tooth less than said stator for relative orbital and rotational movement between said stator and said rotor to provide expanding and contracting fluid pockets between the teeth thereof, a work input-output shaft mounted for rotation on said housing in axial alignment therewith, means for connecting said work input-output shaft and said gerotor gear set for joint rotation relative to the rotational component of movement of said gerotor gear set, a friction brake member disposed between said gerotor gear set and said housing wall member and connected in fixed assembly to said housing, at least a portion of said brake member being movable into engagement with said gear set, means forming a pressure chamber in said housing wall member opening to said brake member and, means for directing pressurized fluid to said chamber for urging said brake member into tight frictional braking engagement with said gear set.
Claim 2
Dependent Claim
208 words
A hydraulic motor-pump assembly comprising an axial housing and means including a wall member forming a chamber within said housing, a fluid inlet and a fluid outlet formed in said housing for directing fluid to and from said chamber, a gerotor gear set in said chamber including an internally toothed stator and an externally toothed rotor within said stator and having one tooth less than said stator for relative orbital and rotational movement between said stator and said rotor to provide expanding and contracting fluid pockets between the teeth thereof, a work input-output shaft mounted for rotation on said housing in axial alignment therewith, means for connecting said work input-output shaft and said gerotor gear set for joint rotation relative to the rotational component of movement of said gerotor gear set, a friction brake member disposed between said gerotor gear set and said housing wall member and connected in fixed assembly to said housing, at least a portion of said brake member being movable into engagement with said gear set, means forming a pressure chamber in said housing wall member opening to said brake member and, means for directing pressurized fluid to said chamber for urging said brake member into tight frictional braking engagement with said gear set.
Claim 3
Dependent Claim
51 words
The invention as defined in claim 1 wherein said brake member comprises a flexible disc-shaped plate said portion of which is normally disposed in sliding engagement with said gear set and is movable by virtue of the pressurization of said pressure chamber into tight frictional braking engagement with said gear set.
Claim 4
Dependent Claim
39 words
The invention as defined in claim 1 and including first pump and valve means for connection to said fluid inlet and fluid outlet and second independently operable pump and valve means for controlling the pressurization of said pressure chamber.
Claim 5
Dependent Claim
161 words
A hydraulic motor-pump assembly comprising a housing including stationary wall means, work input-output means including a pair of relatively rotatable gears at least one of which is supported in said housing for rotatable movement relative thereto and a shaft mounted on said housing and connected to said one gear for joint rotation therewith, first hydraulic circuit means for directing fluid to and from said gear means, and hydraulically operated brake or locking means for restraining said one gear against rotation relative to said housing comprising a flexible disc-shaped pressure-operated friction plate disposed between and frictionally engageable with said stationary wall means and said one gear, means forming a pressure chamber in said stationary wall means communicating with said friction plate, and means for pressurizing said chamber to urge said friction plate into tight frictional braking engagement with said stationary wall means and said one gear including second hydraulic circuit means operable selectively and Completely independently of said first hydraulic circuit means.
Claim 6
Dependent Claim
161 words
A hydraulic motor-pump assembly comprising a housing including stationary wall means, work input-output means including a pair of relatively rotatable gears at least one of which is supported in said housing for rotatable movement relative thereto and a shaft mounted on said housing and connected to said one gear for joint rotation therewith, first hydraulic circuit means for directing fluid to and from said gear means, and hydraulically operated brake or locking means for restraining said one gear against rotation relative to said housing comprising a flexible disc-shaped pressure-operated friction plate disposed between and frictionally engageable with said stationary wall means and said one gear, means forming a pressure chamber in said stationary wall means communicating with said friction plate, and means for pressurizing said chamber to urge said friction plate into tight frictional braking engagement with said stationary wall means and said one gear including second hydraulic circuit means operable selectively and Completely independently of said first hydraulic circuit means.
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |