Patent US3754842A successfully refreshed from Google Patents.
US3754842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump
Assignee: Motors Liquidation Co
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Filing: 1971-05-13
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Granted: 1973-08-28
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Expires: 1991-05-13
Abstract
Abstract An axial piston pump having flapper valves on the inlet ports and a continuous flexible ring member providing valving for the outlet ports. The ring member has an elastic sealing surface adjacent to the outlet ports to prevent reverse flow from the pump outlet to the cylinder bores. The ring member is deflected away from the outlet ports when the cylinder bores are pressurized. The deflection of the ring member varies with the amount of fluid flow from the cylinder. Since the amount of fluid flow from a single cylinder in this type of pump is sinusoidal, the outer edge deflection of the ring member is in the form of a sine wave. The ring member also seals the outlet ports to prevent back-flow through the pump when the input shaft is not being driven.
Inventors
- 👤 M Schlanzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/14; F04B1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
324 words
An axial piston pump comprising, valve plate means having a plurality of axial inlet ports, and a plurality of axial outlet ports; an outlet flow chamber in fluid communication with said outlet ports; cylinder block means having a plurality of axially extending cylinder bores each in fluid communication with each of one of said inlet and outlet ports; piston means slidably disposed in said cylinder bores and being reciprocal therein to establish fluid flow into and out of said cylinder bores; inlet valve means disposed between said cylinder block and said valve plate means having flapper means adjacent each said inlet ports for opening in response to the suction stroke of pistons when fluid is flowing into said cylinder bores and being closed by spring tension of said flapper means and pressure in said cylinder bores when fluid is being expelled therefrom and a plurality of flapper deflection limiting means inclined to the cylinder bores and the flapper means for limiting the opening of said flapper means; outlet valve means comprising a continuous flexible ring having a sealing surface adjacent said outlet ports for preventing flow from said outlet flow chamber to said cylinder bores when said flapper means are open, and said continuous flexible ring being displaced from saId outlet ports proportional to the amount of fluid flowing from the cylinder bore when said flapper means is closed to permit fluid flow selectively from said cylinder bores to said outlet flow chamber when said pistons are expelling fluid from said cylinder bores; and deflection limiter means including a threaded portion extending centrally through said valve plate means, said inlet valve means and said outlet valve means and being threadably secured centrally in said cylinder block means for securing together said valve plate means, said inlet valve means, said outlet valve means and said cylinder block means, and a conical section adjacent said flexible ring for limiting the maximum deflection of said flexible ring.
Claim 2
Dependent Claim
324 words
An axial piston pump comprising, valve plate means having a plurality of axial inlet ports, and a plurality of axial outlet ports; an outlet flow chamber in fluid communication with said outlet ports; cylinder block means having a plurality of axially extending cylinder bores each in fluid communication with each of one of said inlet and outlet ports; piston means slidably disposed in said cylinder bores and being reciprocal therein to establish fluid flow into and out of said cylinder bores; inlet valve means disposed between said cylinder block and said valve plate means having flapper means adjacent each said inlet ports for opening in response to the suction stroke of pistons when fluid is flowing into said cylinder bores and being closed by spring tension of said flapper means and pressure in said cylinder bores when fluid is being expelled therefrom and a plurality of flapper deflection limiting means inclined to the cylinder bores and the flapper means for limiting the opening of said flapper means; outlet valve means comprising a continuous flexible ring having a sealing surface adjacent said outlet ports for preventing flow from said outlet flow chamber to said cylinder bores when said flapper means are open, and said continuous flexible ring being displaced from saId outlet ports proportional to the amount of fluid flowing from the cylinder bore when said flapper means is closed to permit fluid flow selectively from said cylinder bores to said outlet flow chamber when said pistons are expelling fluid from said cylinder bores; and deflection limiter means including a threaded portion extending centrally through said valve plate means, said inlet valve means and said outlet valve means and being threadably secured centrally in said cylinder block means for securing together said valve plate means, said inlet valve means, said outlet valve means and said cylinder block means, and a conical section adjacent said flexible ring for limiting the maximum deflection of said flexible ring.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |