US3825376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve arrangement for fluid pressure motor or pump
Assignee: Danfoss AS
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Filing: 1972-11-10
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Granted: 1974-07-23
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Expires: 1992-11-10
Abstract
Abstract The invention relates to a gerotor type motor or pump in which the valving is between the gerotor star member and the adjacent casing wall. A separate valve member, as such, is not provided. The valving includes recesses formed in the star, each of which sequentially moves into fluid communication with inlet and outlet recesses formed in the casing wall. The star member has the usual combined rotary and orbital movements and the valve recesses are accordingly formed or shaped to accommodate this compound movement.
Inventors
- 👤 C Petersen
- 👤 S Giversen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:34
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/103; F04C2/104; F04C2/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
227 words
A fluid pressure motor or pump comprising a casing, an internally toothed ring member having an axis, a cooperating externally toothed wheel member having an axis and having fewer teeth than said ring member, said star gear being disposed with its axis being spaced an eccentric distance from said axis of said ring member, said axis of said ring member and said axis of said wheel member jointly defining a line of eccentricity, said wheel member having rotational movement about its own axis and orbital movement relative to the axis of said ring member with the teeth of said members intermeshing in sealing engagement to form expanding chambers on one side of said line of eccentricity and contracting chambers on the other side of said line during relative movement between said members, said casing forming wall means adjacent said member, two sets of recessed inlet and outlet ports defined in said wall means, fluid inlet and outlet passages in said casing extending to said recessed ports, a set of recessed distributor ports defined in said wheel member, said distributor ports being sequentially registerable with said inlet and outlet ports to alternately receive fluid from said inlet ports and exhausting fluid to said outlet ports, at least one of said sets of inlet and outlet ports has a radial component at least equal to twice said eccentric distance.
Claim 2
Dependent Claim
227 words
A fluid pressure motor or pump comprising a casing, an internally toothed ring member having an axis, a cooperating externally toothed wheel member having an axis and having fewer teeth than said ring member, said star gear being disposed with its axis being spaced an eccentric distance from said axis of said ring member, said axis of said ring member and said axis of said wheel member jointly defining a line of eccentricity, said wheel member having rotational movement about its own axis and orbital movement relative to the axis of said ring member with the teeth of said members intermeshing in sealing engagement to form expanding chambers on one side of said line of eccentricity and contracting chambers on the other side of said line during relative movement between said members, said casing forming wall means adjacent said member, two sets of recessed inlet and outlet ports defined in said wall means, fluid inlet and outlet passages in said casing extending to said recessed ports, a set of recessed distributor ports defined in said wheel member, said distributor ports being sequentially registerable with said inlet and outlet ports to alternately receive fluid from said inlet ports and exhausting fluid to said outlet ports, at least one of said sets of inlet and outlet ports has a radial component at least equal to twice said eccentric distance.
Claim 3
Dependent Claim
34 words
A motor or pump according to claim 1 wherein one of said inlet and outlet ports has a radial width equal to the difference between said radial component and said radial component eccentric distance.
Claim 4
Dependent Claim
34 words
A motor or pump according to claim 1 wherein said distributor ports extend mainly in a radial direction and each distributor port has a radial component at least equal to twice said eccentric distance.
Claim 5
Dependent Claim
15 words
A motor or pump according to claim 1 wherein said distributor ports are triangularly shaped.
Claim 6
Dependent Claim
64 words
A motor or pump according to claim 1 wherein said recessed distributor ports are between the teeth of said wheel member, said distributor ports having circumferentially extending widths on the periphery of said wheel member sufficient so that one of said distributor ports connects adjacent ones of said chambers when said adjacent chambers are symmetrically disposed relative to said one of said distributor ports.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |