Variable displacement vane pump with dual control chambers
US8057201B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2007 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Jul 3, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C14/223
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable capacity vane pump has a pump control ring which is moveable to alter the volumetric displacement of the pump. The pump ring is moved by at least first and second control chambers, which acts on the pump control ring when pressurized working fluid is supplied to them to move the pump control ring to alter the volumetric capacity of the pump. When pressurized fluid is supplied to only one control chamber, the pump operates at a first equilibrium pressure and when pressurized fluid is also supplied to the second chamber, the pump operates at a second equilibrium pressure. If desired, pressurized fluid can also be supplied only to the second control chamber to operate the pump at a third equilibrium pressure and/or additional control chambers can be provided if required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.