US4316707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gerotor with valve plate attached to rotor
Assignee: Danfoss AS
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Filing: 1980-03-10
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Granted: 1982-02-23
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Expires: 2000-03-10
Abstract
Abstract The invention relates to a gerotor type of rotary piston machine. In this type of device an externally toothed rotor member is eccentrically offset relative to an internally toothed stator member and in operation these members mesh to form expanding and contracting cells on opposite sides of the line of eccentricity. There is a shaft means for driving the rotor and a distributing valve for feeding and exhausting the cells. The distributing valve, which is normally connected to the drive shaft, is connected to the rotor member for movement therewith adjacent to the rotor and stator member. An annular chamber is formed between the periphery of the distributing valve and the interior of the casing. One set of the distributing ports is formed as ports within the confines of the periphery of the valve. The other set of distributing ports are formed by the periphery of the valve.
Inventors
- 👤 Gunnar L. Hansen
- 👤 Christian B. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:04
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/103; F04C2/105; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
268 words
A rotary piston machine comprising a casing having interchangeable fluid inlet and outlet ports, an internally toothed stator member and an eccentrically disposed externally toothed rotor member in meshing engagement, said rotor member having rotational movement about its own axis and orbital movement about the axis of said stator member with the teeth of said members intermeshing in sealing engagement to form a group of expanding cells on one side of a rotating line of eccentricity and a group contracting cells on the other side of said line during relative movement between said members, drive shaft means in said casing connected to said rotor member, a valve plate attached to one side of said rotor member and having a sliding and abutting engagement with said stator member in a transversely extending plane, first and second sets of circumferentially and alternately arranged porting means in said plate for sequential fluid engagement with said cells, said first set of porting means being in constant fluid communication with a first one of said ports and a first group of said cells, said second set of porting means being in constant fluid communication with the second one of said ports and a second group of said cells, a generally annularly shaped recess formed between the periphery of said valve plate and the interior of said casing having fluid communication with said first one of said ports and said first set of porting means, said first set of porting means having flow controlling valving edges in said plane which cyclically intersect said cells and are formed by said periphery of said valve plate.
Claim 2
Dependent Claim
268 words
A rotary piston machine comprising a casing having interchangeable fluid inlet and outlet ports, an internally toothed stator member and an eccentrically disposed externally toothed rotor member in meshing engagement, said rotor member having rotational movement about its own axis and orbital movement about the axis of said stator member with the teeth of said members intermeshing in sealing engagement to form a group of expanding cells on one side of a rotating line of eccentricity and a group contracting cells on the other side of said line during relative movement between said members, drive shaft means in said casing connected to said rotor member, a valve plate attached to one side of said rotor member and having a sliding and abutting engagement with said stator member in a transversely extending plane, first and second sets of circumferentially and alternately arranged porting means in said plate for sequential fluid engagement with said cells, said first set of porting means being in constant fluid communication with a first one of said ports and a first group of said cells, said second set of porting means being in constant fluid communication with the second one of said ports and a second group of said cells, a generally annularly shaped recess formed between the periphery of said valve plate and the interior of said casing having fluid communication with said first one of said ports and said first set of porting means, said first set of porting means having flow controlling valving edges in said plane which cyclically intersect said cells and are formed by said periphery of said valve plate.
Claim 3
Dependent Claim
49 words
A rotary piston machine according to claim 1 wherein said second one of said ports is generally coaxial relative to said drive shaft means, said valve plate at least partially defining passage means extending between said second one of said ports and said second set of said porting means.
Claim 4
Dependent Claim
30 words
A rotary piston machine according to claim 2 wherein said passage means of said valve plate extend radially relative to said rotor and between said valve plate and said casing.
Claim 5
Dependent Claim
25 words
A rotary piston machine according to claim 2 wherein said passage means of said valve plate extend radially relative to said valve plate internally thereof.
Claim 6
Dependent Claim
284 words
A rotary piston machine comprising a casing having interchangeable fluid inlet and outlet ports, first and second axially spaced gear sets each including toothed stator member and an eccentrically disposed externally toothed rotor member in meshing engagement, each said rotor member having rotational movement about its own axis and orbital movement about the axis of said stator member of the same set gear set with the teeth of said members intermeshing in sealing engagement to form a group of expanding cells on one side of a rotating line of eccentricity and a group contracting cells on the other side of said line during operation of said gear sets, drive shaft means in said casing connected to said rotors, a valve plate attached to and between said rotor members and having a sliding and abutting engagement with both said stator members in axially spaced transversely extending places, first and second sets of circumferentially and alternately arranged porting means in said plate for sequential fluid engagement with said cells, said first set of porting means being in constant fluid communication with a first one of said ports and a first group of said cells, said second set of porting means being in constant fluid communication with the second one of said ports and a second group of said cells, a generally annularly shaped recess formed between the periphery of said valve plate and the interior of said casing having fluid communication with said first one of said ports and said first set of porting means, said first set of porting means having flow controlling valving edges in both of said planes which cyclically intersect said cells and are formed by said periphery of said valve plate.
Claim 7
Dependent Claim
284 words
A rotary piston machine comprising a casing having interchangeable fluid inlet and outlet ports, first and second axially spaced gear sets each including toothed stator member and an eccentrically disposed externally toothed rotor member in meshing engagement, each said rotor member having rotational movement about its own axis and orbital movement about the axis of said stator member of the same set gear set with the teeth of said members intermeshing in sealing engagement to form a group of expanding cells on one side of a rotating line of eccentricity and a group contracting cells on the other side of said line during operation of said gear sets, drive shaft means in said casing connected to said rotors, a valve plate attached to and between said rotor members and having a sliding and abutting engagement with both said stator members in axially spaced transversely extending places, first and second sets of circumferentially and alternately arranged porting means in said plate for sequential fluid engagement with said cells, said first set of porting means being in constant fluid communication with a first one of said ports and a first group of said cells, said second set of porting means being in constant fluid communication with the second one of said ports and a second group of said cells, a generally annularly shaped recess formed between the periphery of said valve plate and the interior of said casing having fluid communication with said first one of said ports and said first set of porting means, said first set of porting means having flow controlling valving edges in both of said planes which cyclically intersect said cells and are formed by said periphery of said valve plate.
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) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |