US3808952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulating apparatus for a hydraulic machine
Assignee: REPROTH G GmbH
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Filing: 1972-04-20
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Granted: 1974-05-07
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Expires: 1992-04-20
Abstract
Abstract A regulating apparatus for a hydraulic machine, such as an axial piston pump with a regulator for adjusting the position of the swash plate for varying the displaced fluid volume, is provided with hydraulic setting means including a piston forming first and second chambers in a cylinder, and being connected with a regulator for operating it. A spring is located at least in the first chamber, acting on the piston. A auxiliary pump supplies pressure fluid to the second chamber at a predetermined pressure, and a regulating valve reduces the pressure of the fluid and supplies fluid at a reduced pressure to the first chamber so that the piston is balanced in a new position determined by the increasing counter force of the spring, and depending on adjustment of the pressure reducing regulating valve. In a modified embodiment, the working pressure of an axial piston pump is used for adjusting the regulating valve.
Inventors
- 👤 H Knaak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:24
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/08; F04B49/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
254 words
Regulating apparatus for a hydraulic machine, comprising, in combination, regulating means for adjusting the displacement volume of a hydraulic machine; hydraulic setting means including cylinder means, piston means movable in said cylinder means and connected with said regulating means for operating said regulating means, said piston means forming in said cylinder means first and second chambers on opposite sides thereof, and spring means located at least in said first chamber; and control means for supplying regulated fluid at a predetermined pressure to said second chamber, and at an adjusted reduced pressure to said first chamber, said control means including a source of regulating fluid having a predetermined pressure, including a supply conduit for supplying said regulating fluid at said predetermined pressure to said second chamber, and regulating valve means having an inlet conduit for receiving regulating fluid at said predetermined pressure, adjusting means operable for reducing said predetermined pressure of said regulating fluid in said regulating valve means, and an outlet conduit for supplying said regulating fluid at the reduced pressure to said first chamber so that said predetermined pressure in said second chamber is opposed by the lesser reduced counter pressure of the fluid in said first chamber and by said spring means whereby the piston means is moved to reduce said first chamber, and assumes a balanced position due to the increasing resistance of said spring means so that said regulating means of said hydraulic machine are set in accordance with the adjustment of said regulating valve means by said adjusting means.
Claim 2
Dependent Claim
254 words
Regulating apparatus for a hydraulic machine, comprising, in combination, regulating means for adjusting the displacement volume of a hydraulic machine; hydraulic setting means including cylinder means, piston means movable in said cylinder means and connected with said regulating means for operating said regulating means, said piston means forming in said cylinder means first and second chambers on opposite sides thereof, and spring means located at least in said first chamber; and control means for supplying regulated fluid at a predetermined pressure to said second chamber, and at an adjusted reduced pressure to said first chamber, said control means including a source of regulating fluid having a predetermined pressure, including a supply conduit for supplying said regulating fluid at said predetermined pressure to said second chamber, and regulating valve means having an inlet conduit for receiving regulating fluid at said predetermined pressure, adjusting means operable for reducing said predetermined pressure of said regulating fluid in said regulating valve means, and an outlet conduit for supplying said regulating fluid at the reduced pressure to said first chamber so that said predetermined pressure in said second chamber is opposed by the lesser reduced counter pressure of the fluid in said first chamber and by said spring means whereby the piston means is moved to reduce said first chamber, and assumes a balanced position due to the increasing resistance of said spring means so that said regulating means of said hydraulic machine are set in accordance with the adjustment of said regulating valve means by said adjusting means.
Claim 3
Dependent Claim
85 words
Regulating apparatus as claimed in claim 1 including an other spring means in said second chamber; wherein said control means further include reversing valve means in said supply conduit of said source and in said outlet conduit of said regulating valve means and having a first control position for connecting said supply and outlet conduits with said second and first chambers, respectively, and a second control position for connecting said supply conduit with the first chamber and said outlet conduit with said second chamber, respectively.
Claim 4
Dependent Claim
38 words
Regulating apparatus as claimed in claim 1 comprising hydraulic force amplifier means connecting said piston means with said regulating means of said hydraulic machine, and including a separate source of pressure fluid and a low pressure discharge conduit.
Claim 5
Dependent Claim
30 words
Regulating apparatus as claimed in claim 1 wherein said inlet conduit of said regulating valve means receives said regulating fluid at said predetermined pressure from said source of regulating fluid.
Claim 6
Dependent Claim
19 words
Regulating apparatus as claimed in claim 4 wherein said adjusting means of said regulating valve means is manually operablE.
Claim 7
Dependent Claim
66 words
Regulating apparatus as claimed in claim 1 comprising operating means responsive to the working pressure in said hydraulic machine and connected with said adjusting means of said regulating valve means for reducing said predetermined pressure depending on said working pressure of said hydraulic machine so that when working pressure rises, said reduced counterpressure also rises, and when said working pressure drops, said reduced counterpressure also drops.
Claim 8
Dependent Claim
34 words
Regulating apparatus as claimed in claim 6 comprising a combined throttle and check valve in said outlet conduit of said regulating valve means opening only toward said cylinder means of said hydraulic setting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |