Patents
US 8001776 B2: Hydraulic circuit arrangement with a device for limiting control and method for pressure control by controlling displacement
- Granted
- 2011-08-23
- Filed
- 2008-08-26 application 12198233
- Type
- Utility · 14 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
The invention relates to a hydraulic circuit arrangement for setting the delivery volume of a pump, with an electrically activatable control-valve unit, by means of which, alternately, an active side of a servo system can be acted upon with pressure and, at the same time, its passive side can be relieved to the tank, and with a device for pressure limiting pressure regulation, which comprises pressure limiting valves, by means of which the working lines of the pump can be connected to the servo lines. To reduce the servo pressure load and improve the reaction time, check valves which shut off in the direction of the servo system are provided, by means of which the two servo sides can be connected in each case to the charge pressure via a relief line. Moreover, the device for Pressure limiting pressure regulation comprises an orifice which can be positioned in a line leading to the passive servo side. The invention relates, furthermore, to a method for pressure.
Source: PVGPATDIS, file of 2026-04-10 (ipg110823.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| SAUER-DANFOSS INC. 39 patents | US company or organization | Ames, IA | SAUER DANFOSS INC SEC filer EXACT medium confidence: identical full name, one of each nationally | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Martin Wustefeld | Neumünster, DE | 9 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| F04B | Positive-displacement machines for liquids; pumps | F04B49/002 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2014-04-09 | Name change Change of name | SAUER-DANFOSS INC. signed 2013-09-17 | DANFOSS POWER SOLUTIONS INC. AMES, IA | 32641/351 | ECORSEXC, file of 2026-09-25 |
| 2008-08-26 | Assignment Assignment of assignor's interest | WUSTEFELD, MARTIN signed 2008-08-18 | SAUER-DANFOSS INC. AMES, IA | 21441/234 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.