US3760690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary hydraulic machines
Assignee: LUCOS Ltd J
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Filing: 1971-06-28
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Granted: 1973-09-25
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Expires: 1991-06-28
Abstract
Abstract A rotary hydraulic machine has a rotor journalled on a pintle which extends internally of the machine casing. The rotor has an axial bore into which the pintle extends so as to provide a space between the end of the pintle and the end of the bore. Fluid pressure within the casing is admitted to this space to partially offset the pressure urging the rotor onto the pintle.
Inventors
- 👤 F Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:33
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/04; F04B1/10; F04B1/107; F04B1/1071; F04B1/1074; F04B1/1077
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
175 words
A rotary hydraulic machine comprising a pressure fluid containing casing, a ported pintle extending into the casing, a rotor mounted on the pintle and comprising a cylinder member and a flanged shaft secured thereto said cylinder member, having an axial bore into which the pintle extends, a part extending axially from the end of the pintle and sealingly engaged with the flange of said shaft so as to define a closed annular space between the end of the pintle and said flange, an annular part disposed excentrically of the rotor, a plurality of pistons slidable in radial bores in the cylinder member and engaging an inner surface of said annular part and a passage in the cylinder member whereby the fluid pressure contained within the casing is admitted to said closed annular space, whereby a force caused in use by a fluid pressure acting on the rotor to urge the rotor on to the pintle is partially offset by an opposing force on the rotor caused by fluid pressure acting in said closed annular space.
Claim 2
Dependent Claim
175 words
A rotary hydraulic machine comprising a pressure fluid containing casing, a ported pintle extending into the casing, a rotor mounted on the pintle and comprising a cylinder member and a flanged shaft secured thereto said cylinder member, having an axial bore into which the pintle extends, a part extending axially from the end of the pintle and sealingly engaged with the flange of said shaft so as to define a closed annular space between the end of the pintle and said flange, an annular part disposed excentrically of the rotor, a plurality of pistons slidable in radial bores in the cylinder member and engaging an inner surface of said annular part and a passage in the cylinder member whereby the fluid pressure contained within the casing is admitted to said closed annular space, whereby a force caused in use by a fluid pressure acting on the rotor to urge the rotor on to the pintle is partially offset by an opposing force on the rotor caused by fluid pressure acting in said closed annular space.
Claim 3
Dependent Claim
40 words
A machine as claimed in claim 1 in which said axially extending part comprises a bush sealingly slidable within said end of the pintle and there is provided means for biasing said bush towards said end of the axial bore
Claim 4
Dependent Claim
24 words
A machine as claimed in claim 2 which includes a sealing ring carried by said bush and engaging said end of the axial bore.
Claim 5
Dependent Claim
18 words
A machine as claimed in claim 3 in which said sealing ring has a low coefficient of friction.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |