Patent US2030703A successfully refreshed from Google Patents.
Patent US3792936A successfully refreshed from Google Patents.
US3792936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
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Filing: 1972-12-21
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Granted: 1974-02-19
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Expires: 1992-12-21
Abstract
Abstract A rotary sliding vane pump or motor has pressure loaded cheek plates on each side of the revolving rotor and vanes. The cam ring has alternate major and minor diameter circular arcs connected by rising and falling ramps along which fluid displacement occurs. End covers and cheek plates of similar configuration enclose the end faces of the cam ring, rotor and vanes. The cheek plates have pressure loading cavities of circular form opposite each ramp. All of the cavities on each end are connected with a terminal in the adjacent end cover and alternate cavities are perforated to provide fluid passages into the working chambers of the device. The intermediate cavities on each cheek plate are blind. The cheek plates are so located that a perforated cavity on one end lies opposite a blind cavity on the other end of the device and the areas of the cavities are chosen to slightly overbalance the pressure forces existing at the interface between the rotor and cheek plates.
Inventors
- 👤 R Pettibone
- 👤 A Niemiec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:43
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/30; F01C1/34; F01C1/344; F01C1/3446; F01C19/00; F01C19/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
A rotary sliding vane pump or motor having a body comprising a central cam ring having circular arcs of major and minor diameters alternately spaced around its inner cam surface and connected by ramps along which fluid displacement can occur, said body further comprising end covers containing fluid terminals and passages connecting the terminal of one cover with alternately spaced ramps of the cam ring and connecting the terminal of the other cover with the intermediate spaced ramps of the cam ring, a slotted rotor within the cam ring and carrying radially slidable vanes to traverse the cam ring inner surface, cheek plates interposed between each end cover and the rotor and vanes, and means for pressure loading the cheek plates comprising a series of cavities at the interfaces of the cheek plate and end covers, each being peripherally sealed from adjacent cavities, there being one cavity for each ramp, with alternate cavities being perforated to carry fluid through the cheek plate and the other cavities being imperforate, the cheek plates being positioned with their perforate cavities lying opposite the imperforate cavities of the other cheek plate, and passages connecting the imperforate cavities of each cheek plate with its adjacent cover terminal.
Claim 2
Dependent Claim
202 words
A rotary sliding vane pump or motor having a body comprising a central cam ring having circular arcs of major and minor diameters alternately spaced around its inner cam surface and connected by ramps along which fluid displacement can occur, said body further comprising end covers containing fluid terminals and passages connecting the terminal of one cover with alternately spaced ramps of the cam ring and connecting the terminal of the other cover with the intermediate spaced ramps of the cam ring, a slotted rotor within the cam ring and carrying radially slidable vanes to traverse the cam ring inner surface, cheek plates interposed between each end cover and the rotor and vanes, and means for pressure loading the cheek plates comprising a series of cavities at the interfaces of the cheek plate and end covers, each being peripherally sealed from adjacent cavities, there being one cavity for each ramp, with alternate cavities being perforated to carry fluid through the cheek plate and the other cavities being imperforate, the cheek plates being positioned with their perforate cavities lying opposite the imperforate cavities of the other cheek plate, and passages connecting the imperforate cavities of each cheek plate with its adjacent cover terminal.
Claim 3
Dependent Claim
18 words
A pump or motor as defined in claim 1 wherein the caivities are all of the same area.
Claim 4
Dependent Claim
35 words
A pump or motor as defined in claim 1 wherein the imperforate cavities have a total area sufficient to over-balance the summed pressure forces acting to separate the cheek plate from the rotor and vanes.
Claim 5
Dependent Claim
26 words
A pump or motor as defined in claim 1 wherein the cheek plates have their outer portions clamped between the end covers and the cam ring.
Claim 6
Dependent Claim
16 words
A pump or motor as defined in claim 2 wherein each cavity is circular in form.
References Cited (Backward Citations)
US3479962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |