Hydraulic device

Claim 1

IN AN INTERNAL GEAR PUMP HAVING A FIXED STATOR GEAR ELEMENT WITH A PLURALITY OF LOBES DEFINING POCKETS, A MOVABLE ROTOR ELEMENT HAVING A PLURALITY OF TEETH INTERFITTABLE INTO SAID POCKETS UPON ROTATION OF SAID ROTOR ELEMENT, SAID STATOR GEAR ELEMENT HAVING ONE OR MORE POCKET THAN SAID ROTOR ELEMENT HAS TEETH, ROTATION OF SAID ROTOR ELEMENT ABOUT ITS AXIS CAUSING ORBITING OF ITS AXIS ABOUT THE AXIS OF SAID STATOR GEAR ELEMENT, EACH LOBE OF SAID STATOR GEAR ELEMENT COMPRISING A CONTINUOUSLY CURVED SURFACE, EACH ROTOR ELEMENT TOOTH HAVING A TIP AND BEING MOVABLE ADJACENT SAID CURVED SURFACE INTO A POCKET TO PRODUCE A PUMP STROKE WITH A POCKET ROTATIONALLY BEHIND BEING ON AN INTAKE STROKE; THE IMPROVEMENT COMPRISING A VANE ASSEMBLY FOR EACH ROTOR ELEMENT TOOTH, EACH SAID VANE ASSEMBLY COMPRISING WALL MEANS IN EACH SAID ROTOR ELEMENT TOOTH DEFINING AN OPENING EXTENDING THE WIDTH THEREOF AND IN CROSS-SECTION BEING GENERALLY ANNULAR IN SHAPE RADIALLY INWARDLY OF SAID ROTOR ELEMENT TOOTH TIP AND OPENING ONTO SAID ROTOR ELEMENT TOOTH TIP IN TWO GENERALLY PARALLEL WALLS, A VANE IN EACH ROTOR ELEMENT TOOTH OPENING HAIVNG A HEAD PORTION CORRESPONING AT LEAST IN PART TO SAID GENERALLY ANNULAR SHAPE OF SAID OPENING AND RESIDING THEREIN AND HAVING A BODY PORTION EXTENDING ALONG SAID GENERALLY PARALLEL WALLS OF SAID OPENING AND BEYOND SAID ROTOR ELEMENT TOOTH TIP, RESILIENT MEANS ACTING ON SAID VANE HEAD TO URGE SAID VANE AT ALL TIMES TO AN EXTENDED POSITION, EACH SAID VANE BEING SLIDABLE OVER SAID CURVED SURFACE OF A STATOR LOBE ONLY WHEN IT IS THE PRINCIPAL SEALING MEANS BETWEEN A PUMP STROKE IN A POCKET AND AN INTAKE STROKE IN A POCKET ROTATIONALLY BEHIND, NOT MORE THAN TWO VANES BEING ACTIVE AT ANY ONE TIME, THE ANGLE OF CONTACT BETWEEN SAID VANES AND SAID CURVED LOBE SURFACES BEING NOT LARGER THAN ABOUT 30 TO 60 DEGREES.