US3796136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pump or fluid motor
Assignee: Kawasaki Heavy Industries Ltd
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Filing: 1971-09-24
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Granted: 1974-03-12
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Expires: 1991-09-24
Abstract
Abstract A fluid motor or fluid pump of the piston or vane type having a plurality of pistons or vanes, a mounting means for said pistons or vanes, a cam ring, a rear cover, a valve plate interposed between said rear cover and said mounting means and a valve mounted outside of said rear cover. A plurality of annular grooves having openings on an inner side surface of the rear cover are formed in said rear cover. Each groove has a port opening on outer side of the rear cover. The valve plate with passages is disposed between the mounting means and the rear cover for covering said annular grooves and for communicating passages formed in said mounting means with said annular grooves. Between the valve plate and the annular grooves, a plurality of rings or inner and outer rings can be mounted for sliding contact with said valve plate. By changing the connection of said annular grooves with a power source by means of said valve and/or by rotating said inner and outer rings the connection or disconnection of said grooves with said passages are selected.
Inventors
- 👤 H Oguni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:36
CPC Classifications
F; F01; F01B; F01B1/00; F01B1/06; F01B1/0675; F01B1/0696; F01B1/0679; F01B13/00; F01B13/04; F01B13/06; F01B13/061; F03; F03C; F03C1/00; F03C1/02; F03C1/04; F03C1/0403; F03C1/0435; F03C1/0444
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
483 words
A fluid motor or fluid pump comprising a plurality of working members cooperating with a rotor member to form expansible working chambers therein, a cam ring located radially outwardly from said rotor member and having an inwardly facing cam surface arranged to cooperate with said working members, a rear cover mounted laterally of said rotor member and its said working chambers and extending transversely of the axis of the said rotor member, a valve plate mounted between said rear cover and said working chambers, said rear cover having an inner side surface extending transversely of the axis of said rotor member and facing toward said working chambers, and an outer side surface facing in the opposite direction, said rear cover having an annular recess in an inner side surface and a plurality of radially spaced annular grooves opening to said annular recess and disposed outwardly from said working chamber relative to said annular recess and having a plurality of working fluid outlet and inlet ports extending from said annular grooves to its outer side surface, said valve plate being seated within said annular recess in said rear cover and forming a cover for said annular grooves and being slidable relative to the surface of said rotor member about the axis of the said rotor member, said rotor member having working fluid passages each communicating between one of said working chambers at the interface of the contacting surfaces between said rotor member and said valve plate, said valve plate having a plurality of passages extending therethrough and each of said passages arranged to interconnect one of said working passages to one of said annular grooves and the slidable relationship of said valve plate relative to said rotor member affording a change in the connection of the said working fluid passages through said passages in said valve plate with said annular grooves in said rear cover and said inlet and outlet ports communicating with said annular grooves, an annular channel formed in said rear cover and spaced between and from two adjacent ones of said annular grooves and open at one end to said annular recess in said rear cover so that said valve plate extends across said annular channel and said annular channel extends therefrom toward but spaced from the outer side surface of said rear cover, a duct formed in said rear cover and spaced outwardly from said annular recess in the direction toward the outer side surface of said rear cover for affording communication between said channel and the adjacent one of said annular grooves acting at the higher pressure of the two adjacent ones of said annular grooves, and a ring seated within said channel and arranged in contact with the surface of said valve plate covering said annular groove so that leakage of fluid is avoided by virtue of the pressure differential between the adjacent one of said annular grooves.
Claim 2
Dependent Claim
483 words
A fluid motor or fluid pump comprising a plurality of working members cooperating with a rotor member to form expansible working chambers therein, a cam ring located radially outwardly from said rotor member and having an inwardly facing cam surface arranged to cooperate with said working members, a rear cover mounted laterally of said rotor member and its said working chambers and extending transversely of the axis of the said rotor member, a valve plate mounted between said rear cover and said working chambers, said rear cover having an inner side surface extending transversely of the axis of said rotor member and facing toward said working chambers, and an outer side surface facing in the opposite direction, said rear cover having an annular recess in an inner side surface and a plurality of radially spaced annular grooves opening to said annular recess and disposed outwardly from said working chamber relative to said annular recess and having a plurality of working fluid outlet and inlet ports extending from said annular grooves to its outer side surface, said valve plate being seated within said annular recess in said rear cover and forming a cover for said annular grooves and being slidable relative to the surface of said rotor member about the axis of the said rotor member, said rotor member having working fluid passages each communicating between one of said working chambers at the interface of the contacting surfaces between said rotor member and said valve plate, said valve plate having a plurality of passages extending therethrough and each of said passages arranged to interconnect one of said working passages to one of said annular grooves and the slidable relationship of said valve plate relative to said rotor member affording a change in the connection of the said working fluid passages through said passages in said valve plate with said annular grooves in said rear cover and said inlet and outlet ports communicating with said annular grooves, an annular channel formed in said rear cover and spaced between and from two adjacent ones of said annular grooves and open at one end to said annular recess in said rear cover so that said valve plate extends across said annular channel and said annular channel extends therefrom toward but spaced from the outer side surface of said rear cover, a duct formed in said rear cover and spaced outwardly from said annular recess in the direction toward the outer side surface of said rear cover for affording communication between said channel and the adjacent one of said annular grooves acting at the higher pressure of the two adjacent ones of said annular grooves, and a ring seated within said channel and arranged in contact with the surface of said valve plate covering said annular groove so that leakage of fluid is avoided by virtue of the pressure differential between the adjacent one of said annular grooves.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |