Rotary expansible chamber devices – Working chamber surface expressed mathematically
Reexamination Certificate
2007-05-14
2011-10-18
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Working chamber surface expressed mathematically
C418S102000, C418S206100
Reexamination Certificate
active
08038422
ABSTRACT:
Gearwheel pump, having a housing with at least two intermeshing gears with shafts supported by slide bearings lubricated with pumping medium (M) fed from a suction side to a pressure side, a return duct which leads pumping medium which flows outward through the plain bearing back to the suction side, and a valve (5) having a stationary part and a moveable part (20, 21). The valve (5) has a setting characteristic which runs, as a first approximation, linearly at least in one region, wherein the setting characteristic is defined by a differential pressure (Δp) across the valve as a function of a setting path (x) in the valve (5) thereby significantly improving capability for setting the pressure in the transition region between the plain bearing and a dynamic seal of a driveshaft which is guided outward.
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International Search Report; International Application No. PCT/EP2007/054660; International Filing Date: May 14, 2007.
International Preliminary Report on Patentability issued Nov. 17, 2008 in International Application No. PCT/EP2007/054660; International Filing Date: May 14, 2007.
The English translation of the International Preliminary Report on Patentability issued Dec. 10, 2008 in International Application No. PCT/EP2007/054660; International Filing Date: May 14, 2007.
Triebe Rene
Weber Stefan
Antonelli, Terry Stout & Kraus, LLP.
MAAG Pump Systems AG
Trieu Theresa
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